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JP2018007247

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2018007247
Abstract: The present invention provides a display device in the form of generating a sound by
directly vibrating a display panel. SOLUTION: Left and right sound generating actuators 200, 200
'arranged at fixed positions on the left and right sides of a display panel, a sound separating
partition part 600 arranged between the left and right sound generating actuators 200, 200' A
baffle portion 400 is provided around the left and right sound generating actuators 200 and 200
'together with the portion 600. [Selected figure] Figure 2a
Panel vibration type sound generation display device
[0001]
The present invention relates to a display device, and more particularly, to a display device in
which a display panel is directly vibrated to generate sound, and more particularly, to a panel
vibration type sound generation display device capable of realizing stereo sound.
[0002]
With the development of various portable electronic devices such as mobile communication
terminals and notebook computers, there is an increasing demand for flat panel display devices
applicable thereto.
[0003]
The flat panel display device may be a liquid crystal display device (Liquid Crystal Display
Device), a plasma display panel (Plasma Display Panel), a field emission display device (Field
Emission Display Device), a light emitting diode display device (Light Emitting Diode Display
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Device), organic light emission. 2. Description of the Related Art A diode display device (Organic
Light Emitting Diode Display Device) has been studied.
[0004]
Among such display devices, a liquid crystal display (LCD) includes an array substrate including
thin film transistors, an upper substrate including a color filter and / or a black matrix, and a
liquid crystal material layer formed therebetween. The arrangement state of the liquid crystal
layer is adjusted by an electric field applied between both electrodes of the pixel area, whereby
the degree of transmission of light is adjusted to display an image.
[0005]
A display panel of such a liquid crystal display device is defined as a display area (active area:
AA) for providing an image to a user and a non-display area (non-active area: NA) which is a
peripheral area of the display area (AA). The display panel generally includes a first substrate
which is an array substrate on which thin film transistors and the like are formed to define pixel
regions, and a second substrate as an upper substrate on which a black matrix and / or a color
filter layer are formed. Are manufactured together.
[0006]
The array substrate or the first substrate on which the thin film transistor is formed also includes
a plurality of gate lines (GL) extending in a first direction and a plurality of data lines (DL)
extending in a second direction perpendicular to the first direction. One gate region (Pixel) P is
defined by each gate line and data line.
One or more thin film transistors are formed in one pixel region P, and the gate or source
electrode of each thin film transistor may be connected to a gate line and a data line,
respectively.
[0007]
Among such flat panel displays, the liquid crystal display itself is an element having no light
emitting element, and thus a separate light source is required.
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As a result, a backlight unit provided with a light source such as an LED is provided on the back
surface, and light is emitted toward the entire surface of the liquid crystal panel, and an
identifiable image can be realized for the first time.
[0008]
On the other hand, recently, organic light emitting display devices that are in the limelight as
display devices have high response speed, luminous efficiency, luminance, and viewing angle by
using organic light emitting diodes (OLED: Organic Light Emitting Diodes) that emit light by
themselves. Has the advantage of being large.
[0009]
Such an organic light emitting diode display arranges subpixels including organic light emitting
diodes in a matrix form, and controls the brightness of the subpixels selected by the scan signal
according to the gray level of data.
In addition, the organic light emitting diode display device is a self light emitting device, has low
power consumption, high response speed, high luminous efficiency, high luminance, and a wide
viewing angle.
[0010]
On the other hand, there is a set device of a finished product concept including such a display
device, and examples of such a set device may include a TV, a computer monitor, an
advertisement signboard, and the like.
[0011]
Such display devices or set devices include an acoustic output device such as a speaker for
generating and outputting an audio associated with the displayed image.
[0012]
Generally, a display device producing body such as a liquid crystal display or an organic light
emitting diode display produces a display panel or a display only, and assembles the speaker into
a display completed by a separate industry producing a speaker. And a set device for outputting
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video and sound.
[0013]
FIG. 1 is a schematic plan view of a speaker included in a conventional display device.
[0014]
As shown in FIG. 1, in the conventional display device 1 or set device, the speaker 2 is provided
on the rear surface or the lower end of the display panel.
[0015]
In this case, the traveling direction of the sound generated through the speaker 2 is in the
direction of the viewer who views the image in front of the display device 1 because the
advancing direction of the sound is the rear side not the front side of the display panel on which
the image is displayed There is a problem of obstructing the viewer's immersion because
[0016]
In addition, when the sound generated through the speaker 2 travels to the rear side of the
display panel or below the display panel, there is a problem that the sound quality is degraded
due to the interference with the sound reflected by the wall or the bottom.
[0017]
In addition, the speaker included in the conventional display device is such that the traveling
direction of the generated sound is directed to a direction other than the viewer of the display
device, so that not only the sense of localization of the sound is degraded due to the sound
diffraction phenomenon When configuring the set device, etc., since the speaker takes up a
certain space, there is also a problem that the design and the spatial arrangement of the set
device are limited.
[0018]
Therefore, there is an increasing need for a technique that improves the sound quality of the
sound output from the display device and does not disturb the viewer's immersion.
[0019]
SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned
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conventional problems, and an object of the present invention is to directly vibrate a display
panel constituting a display device to generate sound and to generate different sounds from side
to side. It is an object of the present invention to provide a display device capable of generating
panel vibration type sound that can be output to realize stereo sound.
[0020]
Another object of the present invention is to provide left and right sound generating actuators
disposed at fixed positions on the left and right sides of the display panel, a sound separating
partition part disposed between the left and right sound generating actuators, and the left and
right acoustic An object of the present invention is to provide a panel vibration type sound
generation display capable of realizing excellent stereo sound by providing a baffle portion
surrounding the generation actuator.
[0021]
Still another object of the present invention is to form a sound separating partition in the center
of two or more sound generating actuators arranged on the left and right of the display panel,
and to bond the height of the sound separating partition, the number, and the display panel It is
an object of the present invention to provide a display device which is excellent in left and right
stereo sound implementation characteristics by adjusting the presence or absence and the like.
[0022]
Still another object of the present invention is to set the distance between the sound separation
partition disposed at the center of the display panel and the left and right sound generation
actuators for realizing left and right stereo sound to 200 mm or less. It is an object of the present
invention to provide a display device capable of realizing stereo sound while minimizing the dip
phenomenon (Dip) which is the sound quality weakening phenomenon in the middle and high
tone range.
[0023]
Still another object of the present invention is to provide stereo acoustic characteristics by
arranging the sound separation partition wall portion and the baffle portion so that the first and
second air gap spaces are formed symmetrically with respect to the left and right sound
generation actuators. An object of the present invention is to provide a display device that can
ensure the durability and reliability of the sound generation device.
[0024]
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Still another object of the present invention is to be excellent in all audio frequency bands by
further arranging a bass generating bass speaker on one side of a left / right sound generating
actuator structure which directly vibrates a panel to generate middle to high pitch sound. An
object of the present invention is to provide a display device having an acoustic output
characteristic.
[0025]
In order to achieve the above object, the display device according to the present embodiment
includes one or more left sound generating actuators disposed in the left area of the display
panel, and one or more right acoustic waves disposed in the right area of the display panel. A left
side and a right side sound generating actuator is disposed to be in contact with one side of the
display panel to vibrate the display panel to generate sounds, and a center of the left side sound
generating actuator and the right side sound generating actuator. According to the present
invention, there is provided a panel vibration type sound generation display device including a
sound separation partition portion extended in the vertical direction of the display panel and
disposed in contact with the display panel and a rear surface supporting portion supporting the
rear of the display panel.
[0026]
At this time, in order to minimize the dip (dip) phenomenon, which is the sound pressure
weakening phenomenon in the middle and high tone range, the distance (d) between the sound
separating partition and the left sound generating actuator or the right sound generating
actuator is 200 mm. Do the following.
[0027]
In addition, the sound separation barrier portion is disposed between the upper surface of the
cover bottom which is the rear surface support portion and the bottom surface of the display
panel, and the sound separation barrier portion must be bonded to at least the upper surface of
the cover bottom. The bottom surface of the panel can be contacted in a non-adhesive structure,
and the height (H1) of the sound separating partition may be greater than or equal to the gap (T)
between the cover bottom and the display panel.
[0028]
The left sound generating actuator or the right side is configured to form a first air gap space
(AG1) and a second air gap space (AG2) enclosed around the left sound generation actuator or
the right sound generation actuator together with the sound separation partition part. A baffle
may be included that is disposed around the periphery of the sound generating actuator.
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[0029]
At this time, the left sound generation actuator or the right sound generation actuator may be
disposed in left and right symmetrical and / or vertically symmetrical positions in the first air gap
space (AG1) and the second air gap space (AG2), respectively.
[0030]
The baffle portion has a double structure including an adhesive member adhered to the upper
surface of the rear surface support portion and the lower surface of the display panel, and a
sealing portion disposed on the outer surface of the adhesive member. The thickness (t2) of the
sealing portion may be larger than the thickness (t1).
[0031]
Also, the left or right sound generating actuators can be inserted and fixed to the support holes
provided in the cover bottom which is the rear surface support, so that the lower plate included
in each actuator further includes an outwardly extending extension The extension can be fixed to
the bottom of the back support.
[0032]
Meanwhile, the bass speaker further includes one or more bass speakers disposed outside the
first air gap space (AG1) and the second air gap space (AG2) to enhance bass characteristics, and
the bass speaker has a sound separation barrier portion. A left bass speaker may be disposed on
the left side, and a right bass speaker may be disposed on the right side of the sound separating
bulkhead.
[0033]
At this time, the left and right sound generating actuators emit middle- and high-range sound,
and the low-pitch speaker emits low-range sound, and the frequency of the intersection of the
acoustic characteristic curve by the actuator and the acoustic characteristic curve by the lowpitch speaker May be 1 kHz to 1.5 kHz.
[0034]
The display device according to the present embodiment includes a display panel, a first sound
generating actuator in a first area of the display panel, and a second sound generating actuator in
a second area of the display panel, and The sound generating actuator may include a sound
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generating actuator that vibrates the display panel to generate sound, and a partition between
the first sound generating actuator and the second sound generating actuator.
[0035]
A display device according to another embodiment includes a display panel, an acoustic
generation actuator that vibrates the display panel in the first area and the second area of the
display panel to generate sound, and the first area and the second area. At least one of the first
region and the second region may include two or more sound generating actuators.
[0036]
A display device according to another embodiment includes a display panel, an acoustic
generation actuator that vibrates the display panel in the first area and the second area of the
display panel to generate sound, and the first area and the second area. It can include speakers
outside the area.
[0037]
Hereinafter, according to an embodiment of the present invention to be described, a left and right
sound generation actuator disposed at a fixed position on the left and right sides of the display
panel, a sound separation partition part disposed between the left and right sound generation
actuators, By providing a baffle part surrounding the left and right sound generating actuators
together with the sound separating partition part, it is possible to achieve stereo sound
implementation which is excellent in the panel vibration type sound generating display device.
[0038]
In addition, the sound separation partition is formed at the center of the left and right sound
generation actuators, and the height and number of sound separation partitions, the number of
them, and the presence or absence of adhesion with the display panel are adjusted to optimize
the left and right stereo sound implementation characteristics. be able to.
[0039]
In addition, by setting the distance between the sound separation partition disposed at the center
of the display panel and the left sound generation actuator and the right sound generation
actuator for the left and right stereo sound implementation to 200 mm or less, It is possible to
minimize the dip phenomenon (Dip) which is the sound quality weakening phenomenon.
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[0040]
Durability and reliability of the stereo acoustic characteristics and the sound generator by
arranging the sound separation partition wall portion and the baffle portion so that the first and
second air gap spaces are formed symmetrically with respect to the left and right sound
generation actuators. There is an effect that can be secured.
[0041]
In addition, by further arranging a bass sound generation bass speaker on one side of the left and
right sound generation actuator structure that directly vibrates the panel to generate middle and
high range sound, it is possible to have excellent sound output characteristics in all audio
frequency bands. can do.
[0042]
In addition, by fixing the sound generation actuator to the support hole formed in the rear
surface support portion of the display device, it is possible to reduce the thickness of the display
device while having excellent sound generation performance.
[0043]
It is a schematic top view with respect to the speaker contained in the conventional display
apparatus.
1 is a plan view of a schematic view of a display device including a panel vibration type sound
generation device according to an embodiment of the present invention.
1 is a cross-sectional view in a schematic view of a display device including a panel vibration type
sound generation device according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view of two types of sound producing actuators that can be used for
the left or right sound producing actuators of the present invention.
FIG. 6 is a cross-sectional view of two types of sound producing actuators that can be used for
the left or right sound producing actuators of the present invention.
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FIG. 5 illustrates a left or right sound generating actuator according to an embodiment of the
present invention vibrating a display panel to generate sound.
FIG. 5 illustrates a left or right sound generating actuator according to an embodiment of the
present invention vibrating a display panel to generate sound.
FIG. 6 illustrates an example of a coupled state of a left or right sound generating actuator and a
cover bottom that is a back support portion of a display device according to an embodiment of
the present invention.
FIG. 6 illustrates an example of a coupled state of a left or right sound generating actuator and a
cover bottom that is a back support portion of a display device according to an embodiment of
the present invention.
Figure 7 illustrates another embodiment for the coupling structure of the left or right sound
generating actuator and the cover bottom.
Figure 7 illustrates another embodiment for the coupling structure of the left or right sound
generating actuator and the cover bottom.
In order to form a first air gap space (AG1) for acoustic transmission and a second air gap space
(AG2) between the display panel as the diaphragm and the cover bottom, between the display
panel and the support structure of the display panel An example of the baffle part formed in FIG.
In order to form a first air gap space (AG1) for acoustic transmission and a second air gap space
(AG2) between the display panel as the diaphragm and the cover bottom, between the display
panel and the support structure of the display panel An example of the baffle part formed in FIG.
In order to form a first air gap space (AG1) for acoustic transmission and a second air gap space
(AG2) between the display panel as the diaphragm and the cover bottom, between the display
panel and the support structure of the display panel An example of the baffle part formed in FIG.
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Fig. 6 illustrates the position of the left or right sound generating actuator according to the
present embodiment and the sound generation characteristics according thereto.
Fig. 6 illustrates the position of the left or right sound generating actuator according to the
present embodiment and the sound generation characteristics according thereto.
Fig. 6 illustrates the position of the left or right sound generating actuator according to the
present embodiment and the sound generation characteristics according thereto.
Fig. 6 illustrates the position of the left or right sound generating actuator according to the
present embodiment and the sound generation characteristics according thereto.
Fig. 6 illustrates the position of the left or right sound generating actuator according to the
present embodiment and the sound generation characteristics according thereto.
FIG. 5 illustrates an example in which left or right sound generating actuators are asymmetrically
disposed in the first air gap space (AG1) and the second air gap space (AG2).
FIG. 5 illustrates an example in which left or right sound generating actuators are asymmetrically
disposed in the first air gap space (AG1) and the second air gap space (AG2).
6 illustrates an example in which left and right sound generating actuators according to the
present embodiment are disposed symmetrically in the left and right direction and / or vertically
in the first air gap space (AG1) and the second air gap space (AG2).
The detailed structure of the sound separation partition part by this embodiment is illustrated.
The detailed structure of the sound separation partition part by this embodiment is illustrated.
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The detailed structure of the sound separation partition part by this embodiment is illustrated.
FIG. 7 is another embodiment of the sound separation partition, illustrating the sound separation
partition having a triple partition structure.
FIG. 7 is another embodiment of the sound separation partition, illustrating the sound separation
partition having a triple partition structure.
Fig. 10 illustrates the sound generation characteristics when using the embodiment according to
Fig. 10 according to this embodiment.
FIG. 6 illustrates a structure further including a bass speaker disposed outside the first air gap
space (AG1) and the second air gap space (AG2), in addition to the sound generation actuator
configuration according to the present embodiment.
FIG. 6 illustrates a structure further including a bass speaker disposed outside the first air gap
space (AG1) and the second air gap space (AG2), in addition to the sound generation actuator
configuration according to the present embodiment.
FIG. 15 illustrates the sound generation characteristics when using the embodiment according to
FIG. 14, illustrating the sound characteristic curve by the bass speaker and the sound
characteristic curve by the sound generation actuator, and a phenomenon in which both sound
characteristic curves intersect at an intersection point P Is illustrated.
[0044]
Hereinafter, some embodiments of the present invention will be described in detail through
exemplary drawings.
In adding reference symbols to components in each drawing, the same components can have the
same reference numerals as much as possible, even if they are displayed on other drawings.
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Further, in the description of the present invention, when it is determined that the detailed
description for the related known configurations or functions may obscure the gist of the present
invention, the detailed description will be omitted.
[0045]
Further, in describing the components of the present invention, terms such as first, second, A, B,
(a), (b) can be used.
Such terms are used to distinguish the component from the other components, and the term is
not intended to limit the nature, order, procedure, number, etc. of the components.
Where a component is described as "connected", "coupled" or "connected" to another component,
the other component can be directly connected or connected to the other component, but It
should be understood that other components may be interposed between each component or
each component may be "connected", "coupled" or "connected" through other components. .
[0046]
FIG. 2 is a schematic view of a display device including the panel vibration type acoustic
generator according to the present embodiment, FIG. 2a is a plan view, and FIG. 2b is a crosssectional view.
[0047]
As shown in FIG. 2, the display device according to the present embodiment includes a display
panel 100 for displaying an image and sound generation actuators 200 and 200 ′ for
generating sound by vibrating the display panel by contacting one surface of the display panel. It
is comprised including.
[0048]
The sound generating actuator includes a left sound generating actuator 200 disposed at a
partial position on the left side of the display panel, and a right sound generating actuator 200
'disposed at a partial position on the right side of the display panel. The sound separating
partition 600 is disposed as a member for separating the generating actuator.
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[0049]
Hereinafter, in this specification, different expressions can be used such that the left side and the
right side are the first side and the second side, and the left sound generation actuator and the
right sound generation actuator are respectively the first sound generation actuator and the
second sound generation It can be expressed as an actuator.
[0050]
Also, the sound separating partition and the rear surface support can be simply expressed as a
partition and a support.
[0051]
The sound separation partition 600 is a partition structure extended in the vertical direction of
the display panel and disposed between the display panel 100 and the cover bottom 300 which
is a rear surface support, and is generated by the left sound generating actuator 200. By
separating the sound generated by the right sound generating actuator 200 'from the sound
generated by the right sound generating actuator 200'.
[0052]
The sound separating partition 600 may be formed of a foam pad or a one-sided / double-sided
tape and must be bonded to at least the upper surface of the cover bottom and be bonded or not
bonded to the bottom of the display panel. You can contact
[0053]
In addition, the sound separating partition 600 can contact the bottom surface of the display
panel in a non-adhesive manner in order to maintain the sound emitting function as well as the
sound separating function of stereo sound, the height of the sound separating partition 600 (H1 )
May be equal to or greater than the distance (T) between the display panel 100 and the cover
bottom 300, ie, the thickness of the first or second air gap space 700, 700 '.
[0054]
Hereinafter, the first air gap space and the second air gap space will be used in the same
meaning as the first space and the second space, respectively.
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[0055]
The detailed configuration of the sound separating partition 600 will be described in more detail
below with reference to FIG.
[0056]
On the other hand, the distance (d) between the sound separation partition and the left acoustic
generation actuator or the right acoustic generation actuator is 200 mm or less in order to
minimize the dip (dip) phenomenon, which is the sound pressure weakening phenomenon in the
middle and high tone range. This will be described in more detail below with reference to FIG.
[0057]
As will be described in more detail with reference to FIG. 4, the left acoustic generating actuator
200 or the right acoustic generating actuator 200 ′ includes a magnet, a plate for supporting
the magnet, a center pole projecting from a central region of the plate, and the center pole. The
coil includes a bobbin wound with a coil to which a current for sound generation is applied, and a
tip of the bobbin is disposed in contact with one surface of the display panel.
[0058]
Also, as shown in FIG. 2b, the display device can include a back support that supports one or
more of the back or side of the display panel, and the plate of the sound generating actuator is
fixed to the support structure.
[0059]
Meanwhile, since the left sound generating actuator 200 or the right sound generating actuator
200 'may have the same structure, one of the left sound generating actuator 200 and the right
sound generating actuator 200' is represented in the following specification. It will be expressed
as a sound generation actuator.
[0060]
The back support includes a cover bottom 300 disposed on the back of the display panel, and
further includes a middle cabinet 500 coupled to the cover bottom surrounding the side of the
display panel and receiving and supporting one side edge of the display panel. be able to.
[0061]
The cover bottom that constitutes the rear surface support may be a plate member made of metal
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or plastic that extends over the entire rear surface of the display device.
[0062]
On the other hand, the cover bottom 300 in the present specification is not limited to the term,
and plate bottom, back cover, base frame, metal frame, metal frame, metal A support that can be
used in other representations such as chassis (Metal Chassis), chassis base, m-chassis, etc. and
supports the display panel, all located at the rear base of the display device It should be
understood as a concept including a frame or plate-like structure in the form of
[0063]
As used herein, the term “display device” is a narrow definition such as a liquid crystal module
(LCM) including a display panel and a drive unit for driving the display panel, an organic light
emitting display module (OLED module), and the like. Display devices as well as set electronic
devices such as notebook computers, TVs, computer monitors, smart phones, or mobile
electronic devices such as electronic pads, or even set devices that are finished products
including such LCMs, OLED modules etc. Use as an included concept.
[0064]
That is, the display device in the present specification is used to include display devices in the
narrow sense such as LCM and OLED module as well as set devices which are application
products including them.
[0065]
However, in some cases, an LCM composed of a display panel and its drive unit, an OLED module
will be expressed as a "display device" in a narrow sense, and a complete set of electronic devices
including such LCM, OLED modules It can also be expressed separately as “device”.
For example, a display device in a narrow sense includes a liquid crystal (LCD) or organic light
emitting (OLED) display panel and a source PCB which is a control unit for driving the same, and
a set device is electrically connected to the source PCB to set the set device. It may be a concept
further including a set PCB which is a set control unit that controls the whole.
[0066]
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The display panel 100 used in the present embodiment is a liquid crystal display panel, an
organic light emitting diode (OLED) display panel, and a plasma display panel (PDP) that all types
of display panels are used. It is not limited to a specific display panel as long as it can generate
sound waves by being directly vibrated by the sound generation actuator 200.
[0067]
More specifically, when the display panel is a liquid crystal display panel, pixels defined in
multiple gate lines and data lines and their intersections, and switching elements for adjusting
light transmittance in each pixel And an upper substrate including a color filter and / or a black
matrix, and a liquid crystal material layer formed therebetween.
[0068]
Also, in the case where the display panel is an organic electroluminescent (OLED) display panel,
in order to selectively apply a voltage to each of the pixels defined in multiple gate lines, data
lines and their intersections, and to each pixel And an encapsulation substrate disposed on the
array substrate so as to cover the organic luminescence element (OLED) layer on the array
substrate and the organic luminescence element layer, and an encapsulation substrate (Encap.
) Can be configured to include a substrate and the like.
The sealing substrate protects the thin film transistor, the organic light emitting element layer,
and the like from external impact, and prevents moisture from entering the organic light emitting
element layer.
[0069]
The form of the display panel used in the display device according to the present embodiment is
not limited, but the display panel of the organic electroluminescent display panel is more
preferable for the following reasons.
[0070]
Specifically, in the case of a liquid crystal display panel, a back light of an indirect light source
system in which a large number of layers are stacked and a separate light source is disposed has
to be provided. The directionality of the material may sway, which may cause distortion of the
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image.
[0071]
On the other hand, the organic light emitting element of the organic light emitting (OLED) display
panel corresponds to a self light emitting element and does not need a separate light source, and
a polarization layer (POL), a glass layer, an encapsulation layer (Encap.
And so on), distortion of the image does not occur because the light emission characteristics of
the organic light emitting layer are hardly affected even when directly vibrated by the sound
generating actuator 200.
Therefore, it is more preferable to use the organic light emitting display panel in the present
embodiment.
[0072]
Meanwhile, since the display panel used in the display device according to the present
embodiment has a general structure, more detailed description of the display panel will be
omitted.
[0073]
In addition, the display device according to the present embodiment may be a first air gap space
700 (AG1), which is a space disposed between the display bottom and the cover bottom 300 or
the middle cabinet 500, which is a rear surface support, and the generated sound wave. And a
baffle portion 400 for forming the second air gap space 700 '(AG2).
[0074]
That is, as shown in FIG. 2, a baffle portion 400 as a four-side sealed sealing structure between
the display panel and the cover bottom 300 is formed, and the baffle portion and the sound
separating partition portion 600 form the left acoustic generating actuator 200. A first air gap
space 700 is formed around the periphery, and a second air gap space 700 ′ is formed around
the right side sound generating actuator 200 ′.
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[0075]
The first air gap space 700 (AG1) and the second air gap space 700 '(AG2) function as an
enclosed space in which sound is generated when the display panel is vibrated by the left or right
sound generating actuator.
[0076]
At this time, the left acoustic generation actuator or the right acoustic generation actuator is
disposed in the first air gap space (AG1) and the second air gap space (AG2) in left-right
symmetric and / or upper and lower symmetrical positions, respectively. The characteristics and
durability and reliability of the sound generator can be secured, and such a configuration will be
described in detail below with reference to FIG.
[0077]
The baffle portion 400 is disposed at the edge of the cover bottom or middle cabinet and is
disposed at an outer portion of the adhesive portion 412 and the adhesive portion to be adhered
to the bottom surface of the display panel to form the first air gap space 700 and the second air
gap space. A sealing portion 414 may be provided to further provide the encapsulation of 700 '.
[0078]
At this time, the bonding part 412 is a double-sided tape (Double-side Tape), and the height of
the sealing part 414 can be made larger than the height of the bonding part 412, as described in
more detail in FIG.
[0079]
Such a detailed structure of the baffle portion will be described in detail below with reference to
FIG.
[0080]
FIG. 3 is a cross-sectional view of two types of sound producing actuators that can be used for
the left or right sound producing actuators of the present invention.
[0081]
The left or right sound generating actuator 200, 200 'used in the present embodiment comprises
a magnet 220 which is a permanent magnet, a plate 210, 210' for supporting the magnet, and a
center pole 230 projecting in a central region of the plate. The bobbin 250 may be configured to
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surround the center pole 230, and a coil 260 may be wound around the outer periphery of the
bobbin and a current for generating an acoustic wave may be applied.
[0082]
Meanwhile, the sound generating actuator used in the present embodiment may include both a
first structure in which the magnet is disposed outside the coil and a second structure in which
the magnet is disposed inside the coil.
[0083]
FIG. 3a is a first structure in which the magnet is disposed outside the coil and can be expressed
as a dynamic type or an external magnet type.
[0084]
The lower plate 210 is fixed to the support hole 310 formed in the cover bottom 300, and the
magnet 220 which is an annular permanent magnet is disposed on the outer periphery of the
lower plate.
[0085]
A top plate 210 'is disposed at an upper portion of the magnet 220, and an outer frame 240 is
formed at an outer portion of the top plate to be protruded from the top plate.
[0086]
On the other hand, a center pole 230 is disposed to protrude in a central region of the lower
plate 210, and a bobbin 250 surrounding the center pole 230 is disposed.
[0087]
A coil 260 is wound around the lower side of the bobbin 250, and an acoustic current is applied
to the coil.
[0088]
Meanwhile, a damper 270 may be disposed between a portion of the upper side of the bobbin
and the outer frame 240.
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20
[0089]
The lower plate 210 and the upper plate 210 'are configured to fix the sound generating actuator
200 to the cover bottom 300 while supporting the magnet 220, and the lower plate 210 is
provided in a circular shape as shown in FIG. 3a. A magnet 220 provided in a ring shape is
provided on 210, and a top plate 210 is provided on the magnet.
[0090]
The lower plate 210 and the upper plate 210 'may be coupled to the cover bottom 300 to fix and
support the magnet 220 positioned between the lower plate 210 and the upper plate 210'.
[0091]
The plate can be made of a magnetic material such as iron (Fe).
The plate is not limited to that term and can be expressed in other terms, such as a yoke.
[0092]
Meanwhile, the center pole 230 and the lower plate 210 may be integrally formed.
[0093]
The bobbin 250 is an annular structure formed of paper, an aluminum sheet, or the like, and the
coil 260 is wound around a certain area under the bobbin.
Such a bobbin and a coil can be combined and expressed as a voice coil.
[0094]
When a current is applied to the coil, a magnetic field is formed around the coil, and the external
magnetic field formed by the magnet 220 moves the entire bobbin upward while being guided by
the center pole according to Fleming's law.
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21
[0095]
On the other hand, since the tip end of the bobbin 250 is in contact with the rear surface of the
display panel 100, the display panel is vibrated by the current application and non-application
states, and such a vibration generates a sound wave.
[0096]
The magnet 220 may be a sintered magnet such as barium ferrite, and the materials are ferric
oxide (Fe2O3), barium carbonate (BaCO3), strontium ferrite with improved magnetic component,
aluminum (Al), nickel (Ni) For example, alloy cast magnets of cobalt (Co) can be used, but not
limited thereto.
[0097]
On the other hand, a damper 270 is disposed between a part of the upper side of the bobbin 250
and the outer frame 240, and the damper 220 is provided in a bellows structure to vertically
vibrate the bobbin while contracting and relaxing by vertical movement of the bobbin. Adjust.
That is, since the damper 270 is connected to the bobbin 250 and the outer frame 240, the
vertical vibration of the bobbin is limited by the restoring force of the damper 270. Specifically,
the bobbin 270 vibrates at a certain height or more, or When vibrating below a certain height,
the restoring force of the damper 270 allows the bobbin to return to the original position.
[0098]
Such dampers can be expressed in other terms, such as edges.
[0099]
On the other hand, FIG. 3 b is a first structure in which the magnet is disposed inside the coil, and
can be expressed as a micro type or an internal magnet type.
[0100]
The lower plate 210 is fixed to the support hole 310 formed in the cover bottom 300, the
magnet 220 is disposed in the central region of the lower plate, and the center pole is extended
at the upper portion of the magnet. It is formed.
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[0101]
The upper plate 210 'is protruded around the outer periphery of the lower plate, and the outer
frame 240 is disposed outside the upper plate.
[0102]
The bobbin 250 is disposed to surround the magnet 220 and the center pole 230, and the coil
260 is wound around the bobbin.
[0103]
Also, a damper 270 is disposed between the outer frame 240 and the bobbin.
[0104]
Such a second type of sound generating actuator has a smaller leakage flux and a smaller overall
size compared to the first type in which the magnet is disposed outside, but the magnetic flux
reduction phenomenon due to a large current input There is a feature that it may occur and it is
difficult to manufacture.
[0105]
In the present embodiment, all actuators according to the first method or the second method can
be used, and for convenience, the structure according to the first method will be representatively
described below.
[0106]
In addition, the sound generation actuator used in the display device according to the present
embodiment is not limited to the form illustrated in FIG. 3, and other types can be used as long as
the display panel can be vertically vibrated by current application to generate sound. Actuators
may be used.
[0107]
FIG. 4 illustrates a left or right sound generating actuator vibrating a display panel to generate
sound according to an embodiment of the present invention.
[0108]
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23
In FIG. 4a, a current is applied, the center pole connected to the lower surface of the magnet
becomes an N pole, the upper plate connected to the upper surface of the magnet becomes an S
pole, and an external magnetic field is generated between the coils. It is formed.
[0109]
If a current for acoustic generation is applied to the coil in this state, an applied magnetic field is
generated around the coil, but a force is generated to move the bobbin upward due to the applied
magnetic field and the external magnetic field.
[0110]
Therefore, as shown in FIG. 4A, the bobbin moves upward, and the display panel in contact with
the tip of the bobbin vibrates upward.
[0111]
In this state, if the current application is stopped or a current in the opposite direction is applied,
a force similar to that of moving the bobbin downward is generated as shown in FIG. Swing to the
side.
[0112]
As described above, the display panel vibrates up and down depending on the direction and
magnitude of current application to the coil, and such vibration generates a sound wave.
[0113]
FIG. 5 illustrates an example of a coupled state of the left or right sound generating actuator
according to an embodiment of the present invention and a cover bottom which is a back support
portion of a display device.
[0114]
FIG. 6 illustrates another embodiment for the coupling structure of the sound generating
actuator and the cover bottom.
[0115]
Hereinafter, one of the left sound generating actuator 200 and the right sound generating
actuator 200 'having the same structure will be represented as a sound generating actuator,
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which can be equally applied to the remaining sound generating actuators.
[0116]
The sound generation actuator 200 according to the present embodiment can be supported
through a support hole formed on a cover bottom or back cover which is a support structure of a
display device, and FIGS. 5 to 6 illustrate various support structures. Do.
[0117]
In the support structure of FIG. 5, the support hole 310 is formed through the cover bottom 300,
and one or more of the lower plate 210, the magnet 220, and the upper plate 210 'of the sound
generating actuator 200 are inside the support hole. It is inserted to be accommodated.
[0118]
The bottom surface of the lower plate 210 is further formed with an extension 212 which is
formed to extend to the outside of the lower plate, and such an extension 212 is fixed to the
bottom surface of the cover bottom 310 to cover the sound generating actuator 200. Can be
attached to
[0119]
In this manner, by fixing the sound generation actuator 200 in a form inserted into the support
hole formed in the cover bottom, the distance between the display panel and the cover bottom
can be reduced, so the thickness of the display device can be reduced. There is an effect that can
be reduced.
[0120]
That is, although the first air gap space and the second air gap space, which are spaces in which
the display panel can vibrate, must exist between the display panel and the cover bottom, the
support of the cover bottom with the acoustic generating actuator When configured to be
inserted / fixed in the hole, the height of the sound generating actuator disposed between the
back surface of the display panel and the inner surface of the cover bottom can be reduced, thus
minimizing the air gap. Can.
[0121]
FIG. 5 shows a screw hole formed on the rear surface of the cover bottom for fixing the sound
generating actuator to the cover bottom, and a bolt 320 or a screw to the screw hole of the cover
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bottom through a through hole formed in the extension 212 of the lower plate. It is a method of
fastening and fixing.
[0122]
On the other hand, FIG. 6a is not a simple screw connection, and a pem nut (Pem Nut) 330 or a
self clinching nut (self) capable of securing a certain distance between the cover bottom 300 and
the lower plate extension 212. After the clinching nut is placed, it is fixed by a bolt 320.
[0123]
As shown in FIG. 6a, using Pem Nut 330 or a self clinching nut provides a certain space between
the sound generating actuator and the cover bottom, so that vibration of the actuator is
generated. There is an advantage that it can be minimized to be transmitted to the cover bottom.
[0124]
Also, in FIG. 6b, an adhesive member such as a double sided tape is disposed between the
extension 212 of the lower plate of the actuator and the cover bottom, and adhesively fixed.
[0125]
As shown in FIG. 6b, when the adhesive member is used, the adhesive member acts as a kind of
damper if the elasticity and thickness of the adhesive member are properly adjusted, so that the
vibration of the actuator is transmitted to the cover bottom. There is an advantage that can be
minimized.
[0126]
As shown in FIG. 5 and FIG. 6, by adopting a method of inserting and fixing the sound generating
actuator 200 for directly vibrating the display panel in contact with the display panel into the
support hole formed in the cover bottom, the actuator It is possible to reduce the thickness of the
display as compared to the case of being completely housed inside.
[0127]
FIG. 7 shows one of the display panel and the display panel support structure to form a first air
gap space 700 and a second air gap space 700 'between the display panel as the diaphragm and
the cover bottom. 7 illustrates an example of a baffle portion formed between the middle cabinet
and the middle cabinet.
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[0128]
Of course, the baffle portion described below does not necessarily have to be formed between the
middle cabinet and the display panel, and as shown in FIG. 10, the baffle portion is formed inside
the outer shell of the display device as follows. The part can be arranged between the display
panel and the cover bottom.
[0129]
As shown in FIG. 7a, in the panel vibration type sound generating device according to the present
embodiment, the space where the panel can be vibrated by the right sound generating actuator
200 'between the display panel 100 and the support structure (cover bottom; 300 etc.) 2 air gap
space 700 'must be secured.
[0130]
That is, when the display panel vibrates, one side of the display panel must be joined to the
support structure of the display panel so that sound waves can be generated, and in particular,
the generated sound is leaked to the outside through the side of the display device or the like.
For this purpose, the display device according to the present embodiment forms a baffle 400
between the lower surface of the display panel and the support structure.
[0131]
More specifically, a certain section (i.e., an air gap space) around the sound generating actuator is
defined, and at the edge of the section, a baffle portion between the lower surface of the display
panel and the upper surface of the middle cabinet or the cover bottom Is to be placed.
[0132]
At this time, the baffle portion 400 includes an adhesive member 412 such as a double-sided
tape adhered between the bottom surface of the display panel and the upper surface of the
support structure of the display device and a sealing portion 414 further disposed outside the
adhesive member. It can be configured.
[0133]
At this time, the section in which the baffle portion is formed may be the entire display panel
area defined as four sides of the outer contour of the display panel, but it is not limited thereto,
as described in FIG. It can be defined as an area having four sides inside the outer shell of the
display panel.
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[0134]
As shown in FIG. 7, in addition to the cover bottom 300 covering the entire rear surface of the
display panel, the support structure of the display device is coupled to the cover bottom and
further includes a middle cabinet 500 for seating a part of the display panel. Can be included.
[0135]
The middle cabinet 500 is a frame-shaped member formed along the outer shell of the display
panel, and includes a horizontal support portion 502 on which a portion of the display panel is
seated, and a cover formed by bending on both sides from the horizontal support portion. It may
have a generally T-shaped cross-section including vertical supports 504 that cover the sides of
the bottom and the sides of the display panel.
[0136]
Such a middle cabinet 500 constitutes the side appearance of the display or setting device and
may optionally not be used or be integral with the cover bottom.
[0137]
According to the embodiment of FIG. 7, the adhesive member 412 constituting the baffle portion
400 is a double-sided tape disposed between the upper surface of the horizontal support portion
of the middle cabinet 500 and the display panel, and the lower surface of the display panel is
middle It functions to bond and fix to the cabinet.
[0138]
In addition, it is preferable that the sealing part 414 which constitutes the baffle part is further
disposed at the outer shell of the adhesive member and has a thickness or height larger than the
thickness or height of the adhesive member.
[0139]
The sealing portion 414 may be made of a highly elastic material such as rubber, and has a
thickness t2 larger than the thickness t1 of the bonding member 412, as shown in FIG. 7b.
[0140]
That is, as shown in FIG. 7b, one surface of the adhesive member 412, which is a double-sided
11-05-2019
28
tape having a thickness t1, is adhesively disposed on the inner portion of the upper surface of the
horizontal support portion 502 of the middle cabinet 500, and the thickness of the adhesive
member is greater than t1. An elastic material sealing portion 414 is disposed.
[0141]
In this state, if the display panel 100 is attached to the other adhesive surface of the adhesive
member 412, the display panel and the middle cabinet are adhered while the sealing portion 414
having a larger thickness is pressed to a certain extent.
(Figure 7c)
[0142]
Therefore, the encapsulation of the second air gap space 700 '(AG2) around the sound
generation actuator can be further improved.
[0143]
As shown in FIG. 7c, the second air gap space 700 '(AG2) of only the thickness of the horizontal
support portion 502 of the middle cabinet and the bonding member 412 is formed, and the
display panel 100 and the cover bottom 300 are coupled. The vibration space in which the
display panel can generate sound can be secured, and the sound wave generated inside can be
prevented from flowing out along the side of the display device.
[0144]
In particular, by making the baffle portion 400 disposed at the edge of the air gap space into a
double structure of the adhesive member 412 and the sealing portion 414 and forming a larger
thickness of the sealing portion, the air gap space is enclosed. There is an effect that it is possible
to further improve and block the outflow of sound.
[0145]
The middle cabinet 500 herein can be replaced with other representations such as a guide panel,
a plastic chassis, a p-chassis, a support main, a main support, a mold frame, etc., and there are a
number of folds It should be understood as a square frame-shaped structure having a crosssectional shape, including all forms of members connected to the cover bottom and used to
11-05-2019
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support the display panel and the baffle portion.
[0146]
The middle cabinet 500 may be made of a synthetic resin mold material such as polycarbonate
and may be manufactured by an injection molding method, but is not limited thereto.
[0147]
On the other hand, although a middle cabinet can be used to support between the cover bottom
and the display panel, such middle cabinet is not necessarily a necessary structure.
[0148]
That is, the display device has a support structure for only the cover bottom or the back cover
without the middle cabinet, or as shown in FIG. 10, the first or second air gap space is defined in
a partial region inside the outer shell of the display device. In this case, the baffle portion
described in FIG. 7 can be disposed between the top surface of the cover bottom and the bottom
surface of the display panel.
[0149]
At this time, an adhesive member 412 in the form of a double-sided tape may be disposed on a
portion of the top surface of the cover bottom, and a sealing portion 414 having a thickness
greater than that of the adhesive member may be disposed outside the adhesive member.
[0150]
If the display panel 100 is coupled to the cover bottom in this state, the sealing portion 414 may
be crimped to ensure the sealing of the second air gap space 700 'for sound transmission.
[0151]
Using the embodiment of FIG. 8, the structure is simplified while the middle support structure
such as the middle cabinet is eliminated, and the baffle portion 400 disposed at the edge of the
air gap space is doubled with the adhesive member 412 and the sealing portion 414. By making
the structure and thickness of the sealing portion larger, it is possible to secure a vibration space
in which the display panel can generate an acoustic sound, and a sound wave generated inside is
along the side of the display device. It can have the effect of preventing outflow to the outside.
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[0152]
In the present embodiment, the thickness of the air gap space, that is, the distance (T) between
the display panel and the cover bottom in the air gap space can be set to about 0.8 to 2.5 mm,
but is limited thereto. It can be determined in another range depending on the degree of
vibration of the display panel.
[0153]
FIG. 8 illustrates the position of the left or right sound generating actuator according to this
embodiment and the sound generation characteristics according thereto.
[0154]
In the embodiment illustrated in FIG. 8a, the left sound generating actuator 200 and the right
sound generating actuator 200 'are spaced apart from the central sound separating partition by a
separation distance d.
[0155]
At this time, the larger the separation distance d between the left or right sound generation
actuator and the sound separation partition part, the better the stereo sound characteristics.
[0156]
That is, as the distance between the left and right sound generating actuators increases, the
separation between the left and right of the sounds generated by the two actuators becomes
more reliable, so that the stereo characteristics can be improved.
[0157]
However, when the separation distance between the two actuators is increased, if the acoustic
current or voltage signal applied to the two actuators is different from each other to realize
stereophonic sound, the acoustic waves generated by the two actuators interfere with each other,
and the specific A phenomenon occurs in which the sound output (sound pressure) decreases in
the frequency band.
[0158]
In particular, such a sound pressure reduction phenomenon causes the sound pressure to rapidly
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31
decrease in the middle to high frequency band of 10 kHz or more depending on the separation
distance d between the left or right sound generating actuator and the sound separation partition
part. Confirm and dip the sound pressure reduction phenomenon in such middle and high range
band (Dip.
Although it can be expressed as a phenomenon, it is not limited thereto.
[0159]
In particular, regardless of the experimental results, regardless of the left and right length of the
display panel, the separation distance 2d between the left and right sound generating actuators is
about 400 mm (that is, the separation distance d between the sound separating partition and the
both actuators is about 200 mm) In addition, it can be confirmed that the dip phenomenon
becomes more severe to the extent that it can not be corrected as the two actuators are further
apart, as will be described in detail below.
[0160]
Figs. 8b to 8e show 1 m (W) output reference position at a separation distance d of 70 mm, 150
mm, 200 mm and 250 mm between each of the left and right actuators and the center sound
separation partition. The experimental result which measured the sound output amount (sound
pressure) according to the frequency band measured by 4 is illustrated.
[0161]
As a method of measuring the sound pressure in a specific frequency band, the sound pressure
level (Sound Pressure Level; SPL) at about 200 to 500 Hz is usually defined as a reference sound
pressure, and then the sound measured in the specific frequency band It can be determined
whether the pressure is different from the reference sound pressure.
[0162]
8b to 8e also use such a method, and as a result of measurement of sound pressure by frequency
band according to the embodiment, the reference sound pressure which is the average sound
pressure at 200 to 500 Hz is about 74 to 75 dB It was measured, and it was measured how much
the sound pressure average in the middle and high range, especially 15 kHz, decreased from the
reference sound pressure based on it.
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32
In FIG. 8 b to FIG. 8 e, the solid line is the actually measured sound pressure, and the dotted line
is an average value (intermediate value).
[0163]
Since the high frequency band that general people can listen to is 15 kHz or less, the test in FIG.
8 measures the sound pressure average at 15 kHz.
[0164]
Generally, when the average output sound pressure in a specific frequency band is within ± 10
dB relative to the reference sound pressure, it can be corrected by software-adaptive amplifier
tuning like an equalizer, but it deviates from the reference sound pressure relative ± 10 dB In
the case where correction is not possible, the acoustic output characteristics deteriorate.
[0165]
As shown in FIG. 8b, when the separation distance d between each of the left and right actuators
and the center sound separation partition is 70 mm each, the average output sound pressure at
15 kHz, which is the highest in the audio frequency band, is about 68 dB. Since it is within the
range of 10 dB within about 74 to 75 dB which is the reference sound pressure, it can be
understood that it is a correctable range.
[0166]
Similarly, as shown in FIGS. 8c and 8d, even when the separation distance d between each of the
actuators and the center sound separation partition is 150 mm and 200 mm, respectively, the
average output sound pressure at 15 kHz is each It can be seen that it is within the range of
about 66 dB and about 64 dB, and within about 10 dB of the reference sound pressure of about
74 to 75 dB, so that it is a correctable range.
[0167]
On the other hand, as shown in FIG. 8e, when the separation distance d between each of the
actuators and the center sound separation partition is 250 mm, the average output sound
pressure at 15 kHz is about 60 dB or less. It can be seen that the correction becomes impossible
by lowering the sound pressure by 10 dB or more.
[0168]
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33
In particular, based on the case where the separation distance d between each of the actuators
and the center sound separation partition portion is 200 mm, when the separation distance d is
200 mm or more, the average output sound pressure at 15 kHz is the reference sound pressure
The phenomenon of decreasing by more than 10 dB occurred.
[0169]
Therefore, in the present embodiment, in order to maintain the sound pressure decrease
phenomenon in the middle and high tone band to a correctable level, the separation distance
between the left sound generation actuator 200 or the right sound generation actuator 200 ′
and the sound separation partition 600. d can be configured to 200 mm or less.
[0170]
On the other hand, the closer the separation distance between the two sound generation
actuators is, the lower the stereo characteristics due to left and right sound separation, so the
separation distance 2d between both sound generation actuators is about 200 mm or more in
order to maintain stereo sound characteristics above a certain level. It can be set to
[0171]
As a result, in the present embodiment, by setting the separation distance d between the left
sound generation actuator 200 or the right sound generation actuator 200 ′ and the sound
separation partition portion 600 to about 100 mm or more and about 200 mm or less, stereo
sound characteristics are obtained. It is possible to maintain the dip (dip) phenomenon, which is
a sound pressure decrease phenomenon in the middle and high tone range band, at a correctable
level while maintaining a certain level or more.
[0172]
FIG. 9 illustrates an example in which the left or right sound generating actuators are
asymmetrically disposed in the first air gap space (AG1) and the second air gap space (AG2).
[0173]
As described in FIG. 8, if the separation distance (2d) of both sound generating actuators is set to
about 400 mm or less in order to minimize the dip phenomenon in the middle and high tone
range, the left and right length of the display panel (ie The positions of the left acoustic
generation actuator 200 and the right acoustic generation actuator 200 'in the first air gap space
AG1 and the second air gap space AG2 may be asymmetrically determined according to the
lateral length).
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34
[0174]
For example, when the horizontal length of the display panel (that is, the horizontal length) is
800 mm or less, the separation distance d between the sound separation partition 600 and the
left or right acoustic generating actuator is appropriately selected at 200 mm or less Thus, the
left sound generation actuator 200 and the right sound generation actuator 200 'can be centrally
located on the left and right sides in the first air gap space (AG1) and the second air gap space
(AG2), respectively. .
[0175]
However, there are many cases where the horizontal length (that is, the horizontal length) of the
display panel is 1000 mm or more in recent years due to the enlargement of the display panel. In
this case, the left acoustic generation actuator 200 or the right acoustic generation actuator 200
' If the separation distance d between the separation partition 600 is set to about 200 mm or
less, as shown in FIG. 9a, the separation distance d between each sound generation actuator and
the sound separation partition, and each sound The separation distances d 'between the
generating actuator and the vertical sides on both sides of the baffle part must have mutually
different values.
[0176]
That is, the left sound generating actuator 200 is disposed at the right side of the first air gap
space 700, not at the left and right symmetrical position, but at the right side. Similarly, the right
sound generating actuator 200 'is located at the left and right symmetrical positions of the
second air gap space 700'. Instead, they are placed at a point that is biased to the left.
[0177]
Thus, when the left sound generating actuator 200 and the right sound generating actuator 200
'are disposed at the left-right asymmetric position of the first air gap space (AG1) and the second
air gap space (AG2), within each air gap space Uneven vibration of the display panel may occur,
which may not only degrade the acoustic characteristics, but also degrade the durability or
reliability of the display device.
[0178]
That is, when each actuator is disposed on one side in the air gap space, the center of the display
panel region included in each air gap space is not the center of vibration, but the partial vibration
is a point where the center is the one side. It may occur.
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[0179]
According to such a partial vibration, the amount of vibration at each position of the display
panel area included in the air gap space is changed, so that not only the acoustic output
characteristic is deteriorated but also the partial display is performed for a long time The
durability or reliability of the panel may be degraded.
[0180]
FIG. 10 illustrates an example in which left and right sound generating actuators according to the
present embodiment are disposed in left-right symmetry and / or top-bottom symmetry in the
first air gap space (AG1) and the second air gap space (AG2).
[0181]
In order to solve the disadvantages described in FIG. 9, in the embodiment illustrated in FIG. 10,
the left and right sound generating actuators 200 and 200 'are symmetrical in the first air gap
space 800 and the second air gap space 800'. The baffle portion 1400 can be formed on the
inner side of the outer periphery of the display panel so that it can be disposed in a symmetrical
position.
[0182]
More specifically, the first air gap space (AG1) and the second air gap space (AG2) enclosed
around the left sound generation actuator or the right sound generation actuator together with
the sound separation partition 600 described above are configured. A left acoustic generation
actuator or a baffle portion 1400 disposed so as to surround the right acoustic generation
actuator, and the left acoustic generation actuator is disposed at the center of the left and right
length of the first air gap space (AG1) The right side sound generating actuator is disposed at the
center of the left and right length of the second air gap space (AG2), and the left side sound
generating actuator is disposed at the center of the upper and lower length of the first air gap
space (AG1) The generating actuator is the upper and lower length of the second air gap space
(AG2) Configured to be placed in the center.
[0183]
That is, as shown in FIG. 10, the left sound generating actuator 200 has the same left and right
separation distance d from the left vertical side of the sound separation partition 600 and the
baffle 1400 and the same from the upper and lower sides of the baffle 1400. Are arranged to
have a vertical separation distance h.
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36
[0184]
For this purpose, the baffle portion 1400 has to be formed inside the outer surface of the display
panel unlike the case where the baffle portion 1400 is formed along the outer surface of the
display panel as shown in FIG.
[0185]
Of course, the baffle portion 1400 in this case has the adhesive member 412 adhered to the
upper surface of the cover bottom 300 and the lower surface of the display panel and the sealing
portion 414 disposed outside the adhesive member as described in FIG. Although it may be a
double structure including, but not limited to, it may be configured only with an adhesive
member.
[0186]
Thus, the positions of the baffle portion and the sound separation partition portion are set so that
the left and right sound generating actuators 200 and 200 'can be disposed at the central
positions of the first air gap space 800 and the second air gap space 800', respectively. As a
result, it is possible not only to improve the stereo sound implementation characteristics, but also
to prevent the partial vibration to improve the durability of the display device and the reliability
of the sound output.
[0187]
FIG. 11 is a cross-sectional view taken along the line II-II 'of FIG. 10, illustrating the detailed
configuration of the sound separation partition according to the present embodiment.
[0188]
As shown in FIG. 11, the sound separating partition 600 of this embodiment extends vertically
from the central region of the display panel to separate left and right sounds generated by the
left and right sound generating actuators.
[0189]
That is, by reducing or absorbing the display panel vibration in the first air gap space and the
second air gap space at the center, the function of blocking the transmission of the sound in both
air gap spaces to the other air gap space is provided. Do.
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[0190]
The sound separating partition 600 may be made of double-sided tape or one-sided tape made of
polyurethane (PU) or polyolefin (PO) having a certain height (thickness) and width, and is
compressed to a certain extent. Can have elasticity.
[0191]
The sound separating partition 600 may be expressed in other terms such as foam pad.
[0192]
The sound separating partition 600 is disposed between the upper surface of the cover bottom
300 and the bottom of the display panel 100, and is adhesively fixed to at least the upper surface
of the cover bottom.
[0193]
On the other hand, the upper end surface of the sound separation partition 600 must be in
contact with the bottom surface of the display panel, but it can be adhesively fixed to the bottom
surface of the display panel. It can also be done.
[0194]
That is, in the embodiment of FIG. 11a, the sound separating partition 600 is formed of a lower
adhesive layer 610 adhered to the top surface of the cover bottom 300, an upper adhesive layer
610 ′ adhered to the bottom surface of the display panel, and two adhesive layers. Such a sound
separation barrier portion can be adhesively fixed to the top surface of the cover bottom and the
bottom surface of the display panel.
[0195]
As shown in FIG. 11a, in the configuration in which the sound separation partition 600 is
adhered to the cover bottom 300 and all the display panels, the left and right sound separation is
absorbed because the vibrations of both air gap spaces are almost absorbed and not transmitted
to other air gap spaces. It has the advantage of excellent characteristics.
[0196]
However, in the structure of FIG. 11a, since the vibrations of the first air gap space and the
second air gap space are completely separated, the size of the diaphragm is reduced and the
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sound pressure in the low frequency band can be reduced.
[0197]
The sound separating partition 600 according to the embodiment of FIG. 11 b is configured by
including only the lower adhesive layer 610 adhered to the upper surface of the cover bottom
300 and the partition layer 620 disposed on the lower adhesive layer. It adheres only to the top
surface of the bottom, and can contact the bottom surface of the display panel in a non-contact
manner.
[0198]
That is, although the upper end surface of the barrier rib layer of the sound separating barrier rib
600 contacts the bottom of the display panel, it is not adhered.
[0199]
According to the embodiment of FIG. 11b, when the sound separation partition part is in a state
of not being adhered to the display panel, in the case of weak vibration due to middle-to-high
range acoustic output, almost all the vibration is absorbed Thus, the left and right sound
separation function is performed, and when there is strong vibration in the low frequency band,
the vibration attenuation amount is reduced so that the low frequency characteristic can be
maintained.
[0200]
That is, according to the embodiment of FIG. 11b, the sound separation characteristic can be
secured in the middle and high frequency band, and the diaphragm can be largely utilized in the
low frequency band to minimize the reduction of the low frequency band sound pressure.
[0201]
In addition, according to the embodiment of FIG. 11b, when the display panel vibrates weakly
due to middle-to-high range sound output, the sound separation partition absorbs most of the
vibration to maintain the left-right sound separation characteristic. When the diaphragm vibrates
strongly due to low frequency band sound output, the entire display panel is used as a
diaphragm by allowing the sound separation partition portion to absorb only a part of the
vibration. Thus, the bass characteristic can be maintained.
[0202]
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39
More specifically, during upward vibration where the left and right sound generation actuators
push the display panel strongly for low-pitched sound output, the entire display panel is used as
a diaphragm by temporarily separating the sound separation partition and the bottom of the
display panel. When the display panel returns downward to its original position, the display
panel contacts the sound separation partition to partially suppress the downward vibration and
prevent sound quality deterioration due to distortion or partial vibration. be able to.
[0203]
As shown in FIG. 11c, the sound separation barrier 600 may have a height H1 greater than the
gap T between the display panel and the cover bottom.
[0204]
That is, as shown in FIG. 11c, when the gap between the display panel and the cover bottom is T
with the display panel 100 coupled to the cover bottom 300, the height H1 of the sound
separating partition 600 is the display panel. May be equal to or larger than the gap T between
the and the cover bottom.
[0205]
Here, the height H1 of the sound separating partition means the height of the state before the
sound separating partition is attached between the display panel and the cover bottom.
[0206]
Therefore, the sound separating partition 600 completely fills the gap between the display panel
and the cover bottom, and the upper end surface of the sound separating partition contacts the
bottom of the display panel, and the display panel and the cover bottom are assembled. The
sound separating partition 600 can be compressed to a certain extent.
[0207]
Thus, by setting the height H1 of the sound separation partition 600 to be larger than the gap (T)
between the display panel and the cover bottom, the left and right acoustic separation function
by the sound separation partition as described above is achieved. can do.
[0208]
On the other hand, when the difference between the height H1 of the sound separation partition
600 and the gap T between the display panel and the cover bottom is large, the sound separation
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characteristic is improved and the distortion of the sound is reduced. The sound pressure in the
bass band may decrease, and conversely, if there is little difference between the height H1 of the
sound separating partition 600 and the gap T between the display panel and the cover bottom,
Although the sound pressure reduction in the sound range is minimized, the sound separation
characteristics can be somewhat reduced.
[0209]
Therefore, by appropriately selecting the height H1 of the sound separation partition 600 for the
gap T between the display panel and the cover bottom, the reduction of the bass band sound
pressure and the distortion of the sound can be achieved while maintaining the sound separation
characteristics. The phenomenon can be minimized.
[0210]
On the other hand, the sound separating partition 600 has a constant width W, and the width W
of the sound separating partition can be determined to be about 8 to 12 mm.
[0211]
As the width W of the sound separation partition increases, the sound separation characteristics
become excellent, but as a result, the left and right diaphragms can be reduced to reduce the
amount of sound output, and the width W decreases, the necessary sound Separation
characteristics can not be maintained.
[0212]
Therefore, in the present embodiment, by setting the width W of the sound separating partition
wall to about 8 to 12 mm, the sound pressure reduction can be minimized while maintaining the
sound separating characteristic.
[0213]
FIG. 12 shows another embodiment of the sound separating partition, and illustrates a sound
separating partition having a triple partition structure.
[0214]
On the other hand, when a single sound separation partition is used for left and right sound
separation as shown in FIG. 11, the stereo acoustic characteristics are improved, but when
implementing mono sound that outputs the same sound on the left and right, Left and right
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acoustic interference may cause the sound pressure to rapidly decrease at a specific frequency.
[0215]
That is, at the time of the monophonic realization that outputs the same sound on the left and
right, since the display panel regions of the first air gap space and the second air gap space have
the same vibration characteristics, the resonance phenomenon or the interference phenomenon
occurs in a fixed frequency band. The maximization may cause a problem that the sound
pressure decreases sharply.
[0216]
For such a case, in the embodiment of FIG. 12, the left side of the sound separation partition is
arranged to the left and right with the central sound separation partition 640 and the first
separation distance (d1) from the central sound separation partition. It may be configured to
have a triple-layer structure including the sound separating partition 650 and the right sound
separating partition 650 '.
[0217]
As shown in FIG. 12, if the sound separation partition wall portion is formed in a triple partition
wall structure, the interference between the left and right sound is continuously reduced in a
wide area.
Therefore, when the monophonic sound is embodied, even if the left and right acoustic
interference intensifies at a specific frequency, it is possible to prevent a phenomenon in which
acoustic characteristics are discontinuously recognized by preventing a rapid decrease in sound
pressure decrease.
Of course, the sound separation partition is not necessarily limited to the triple structure, and
may be configured to include two or more multiple partitions.
[0218]
At this time, as shown in FIG. 12a, the left or right acoustic generating actuator should be moved
to the left or right by d1 / 2 from the position of the left or right acoustic generating actuator
when using a single sound separation partition. You must.
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[0219]
Also, as shown in FIG. 12b, the height (H2) of the central sound separation partition may be
greater than or equal to the height (H3) of the left sound separation partition or the right sound
separation partition.
[0220]
According to this structure, when the left and right acoustic interference is small, the central
sound separation partition mainly reduces the interference, and when the left and right acoustic
interference becomes large in the specific frequency band and the interference vibration
becomes large, the left and right The sound separating partition can absorb the interference
vibration.
Therefore, it is possible to appropriately cope with all weak interference and strong interference
of left and right sound.
[0221]
As described above, by forming the sound separating partition in a triple structure and making
the height H2 of the central sound separating partition larger than the height H3 of the left and
right sound separating partition, the left and right acoustic interference occurs when the mono
sound is realized. There is an effect that it is possible to prevent an abrupt sound pressure
decrease phenomenon at a specific frequency due to
[0222]
FIG. 13 illustrates the sound generation characteristics when using the embodiment according to
FIG. 10 according to this embodiment.
[0223]
As shown in FIG. 10, the sound separating partition 600 is disposed at the center, the distance
(2d) between the left and right sound generating actuators is set to about 400 mm or less, and
the air gap space 800, 800 'corresponding to the left and right sound generating actuators. After
arranging them symmetrically in the middle, the frequency-specific sound output characteristics
were measured, and the results are shown in FIG.
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43
[0224]
That is, dotted lines in FIG. 13 are acoustic characteristic curves in the case where the entire
display panel is used as a diaphragm and the distance between the left and right sound
generating actuators is increased (that is, the structure of FIG. 8a). The solid line is an acoustic
characteristic curve in the case where a part of the display panel is used as a diaphragm while
the distance between the left and right sound generating actuators is 400 mm or less (that is,
FIG. 10).
[0225]
As shown in FIG. 13, when the embodiment according to FIG. 10 is used, the dip phenomenon
which is a sound pressure reduction phenomenon in the middle to high frequency band (several
kHz to several tens of kHz) is considerably compared to the embodiment illustrated in FIG. It
turns out that it improves.
(Refer to area B in Figure 13)
[0226]
However, in the embodiment of FIG. 10, the size of the area of the display panel vibrated by the
left and right sound generating actuators, that is, the size of each air gap space is reduced.
That is, as the area of the display panel utilized as the diaphragm is reduced, the output of the
bass band is reduced as indicated by the area C in FIG.
[0227]
In order to solve such a bass weakening problem, the embodiment of FIG. 14 presents a structure
in which an additional bass speaker is further arranged.
[0228]
FIG. 14 illustrates a structure further including a bass speaker disposed outside the first air gap
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44
space (AG1) and the second air gap space (AG2) in addition to the sound generation actuator
configuration according to the present embodiment.
[0229]
As described in FIG. 13, when the embodiment according to FIG. 10 is used, a phenomenon may
occur in which the sound pressure in the bass band decreases.
[0230]
In order to solve this, in the embodiment of FIG. 14, in addition to the sound generating structure
including the left and right sound generating actuators, the embodiment further includes a bass
speaker 900 disposed outside the sound generating structure.
[0231]
That is, as shown in FIG. 14A, the left and right sound generating actuators 200 and 200 'as
described in FIG. 10 and a baffle portion 1400 for forming air gap spaces 800 and 800'
surrounding them as shown in FIG. The structure of the sound separation partition 600 is
formed, and one or more bass speakers 900 are disposed outside the first air gap space 800
(AG1) and the second air gap space 800 '(AG2).
[0232]
The bass speaker 900 may be a general-purpose speaker or a woofer speaker that generates
sound of several KHz or less.
[0233]
Such a bass speaker may be disposed below the air gap space as shown in FIG. 14a, but is not
limited thereto, and may be disposed on the side or upper side of the air gap space.
[0234]
Also, although such a bass speaker 900 can be disposed only one without left / right division, it
is configured to include two or more bass speakers disposed on the left and right for left / right
sound separation of the bass band. It can also be done.
[0235]
That is, as shown in FIG. 14b, the sound separation partition can be extended to the lower part of
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the air gap space, and the left bass speaker 900 'and the sound separation partition are disposed
on the left side of the extension formed sound separation partition. A right bass speaker 900 ''
may be included which is located to the right of the unit.
[0236]
The bass loudspeakers arranged in this manner can minimize the sound pressure reduction
phenomenon of the bass band in the embodiment as shown in FIG. 10 described above and
maintain the sound output characteristic in the whole band, especially on the left and right sides.
There is an advantage that stereo sound can be embodied even in the low frequency band by
being configured with the low frequency speaker.
[0237]
FIG. 15 illustrates acoustic generation characteristics when the embodiment according to FIG. 14
is used, and illustrates the acoustic characteristic curve by the bass speaker and the acoustic
characteristic curve by the acoustic generation actuator. The phenomenon of crossing is
illustrated.
[0238]
In FIG. 15, the dashed-dotted line is an acoustic characteristic curve by a bass speaker (woofer
speaker), and the solid line is an acoustic characteristic curve of the acoustic output device
according to the embodiment as shown in FIG.
[0239]
As shown in FIG. 15, the acoustic characteristic curve of the embodiment according to FIG. 10
shows that the sound pressure is increased at about 1 kHz and the sound is output above a
certain level up to about 20 kHz, the bass speaker is from about 100 Hz to about 2000 Hz Has a
characteristic of emitting bass in the frequency band of
[0240]
At this time, an intersection point P of the acoustic characteristic curve by the left and right
acoustic generation actuators and the acoustic characteristic curve by the bass speaker according
to FIG. 10 is formed in a frequency band of about 1 kHz to 1.5 kHz.
[0241]
As described above, by additionally providing a separate bass speaker in addition to the panel
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46
vibration type acoustic generation structure, and by configuring the acoustic generation actuator
and the bass speaker to cross-over at about 1 kHz to 1.5 kHz, There is an advantage that the
stereo feeling can be maximized while securing a certain or more sound output over the entire
frequency band.
[0242]
As described above, according to the present embodiment, the left and right sound generating
actuators disposed at fixed positions on the left and right sides of the display panel, the sound
separating partition part disposed between the left and right sound generating actuators, and the
sound separating partition By providing the baffle portion surrounding the left and right sound
generation actuators together with the portion, there is an effect that stereo sound
implementation that is excellent in the panel vibration type sound generation display device is
possible.
[0243]
In addition, the sound separation partition is formed at the center of the left and right sound
generation actuators, and the height and number of sound separation partitions, the number of
them, and the presence or absence of adhesion with the display panel are adjusted to optimize
the left and right stereo sound implementation characteristics. be able to.
[0244]
In addition, by setting the distance between the sound separation partition disposed at the center
of the display panel and the left sound generation actuator and the right sound generation
actuator for the implementation of left and right stereo sound to 200 mm or less, It is possible to
minimize the dip phenomenon (Dip) which is the sound quality weakening phenomenon.
[0245]
Durability and reliability of the stereo acoustic characteristics and the sound generator by
arranging the sound separation partition wall portion and the baffle portion so that the first and
second air gap spaces are formed symmetrically with respect to the left and right sound
generation actuators. There is an effect that can be secured.
[0246]
In addition, by further arranging a bass sound generation bass speaker on one side of the left and
right sound generation actuator structure that directly vibrates the panel to generate middle and
high range sound, it is possible to have excellent sound output characteristics in all audio
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frequency bands. can do.
[0247]
In addition, by fixing the sound generation actuator to the support hole formed in the rear
surface support portion of the display device, it is possible to reduce the thickness of the display
device while having excellent sound generation performance.
[0248]
The above description and the attached drawings merely illustrate the technical concept of the
present invention, and essential characteristics of the present invention can be obtained by those
skilled in the art to which the present invention belongs. Various modifications and changes such
as combination, separation, replacement, and modification of configurations are possible without
departing from the scope of the present invention.
Accordingly, the embodiments disclosed in the present invention are not intended to limit the
technical spirit of the present invention, but are for explanation, and the scope of the technical
spirit of the present invention is limited by such embodiments. It is not a thing.
The scope of protection of the present invention should be interpreted by the claims, and all
technical concepts within the equivalent scope should be construed as being included in the
scope of the present invention.
[0249]
100 Display Panel 200 Left Sound Generation Actuator 200 'Right Sound Generation Actuator
210, 210' Upper and Lower Plate 220 Magnet 230 Center Pole 240 External Frame 250 Bobbin
260 (Voice) Coil 300 Cover Bottom 310 Support Hole 400, 1400 Baffle Part 412 Adhesive
Member 414 sealing unit 500 middle cabinet 600 sound separating partition 700, 800 first air
gap space (AG1) 700 ', 800' second air gap space (AG2) 900 bass speaker
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