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JP2018110369

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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
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DESCRIPTION JP2018110369
Abstract: The present invention provides a display device in the form of generating a sound by
directly vibrating a display panel. An actuator fixing device 1000 includes a first support portion
1120 supporting a first actuator 200, a second support portion 1220 supporting a second
actuator 200 ', and a first support portion and a second support portion adjacent to each other.
And a plurality of mounting holes 1310-1340 for fixing to the cover bottom. The actuator fixing
device 1000 further includes a pem nut 330 fixed to the cover bottom 300, and the actuator
fixing device 1000 is fixed to the pem nut by a fixing bolt 320 inserted into the mounting hole.
[Selected figure] Figure 3
Actuator fixing device and panel vibration type sound generation display device including the
same
[0001]
The present invention relates to a display device, and more particularly, to a display device in a
form in which a display panel is directly vibrated to generate a sound and an acoustic generating
actuator fixing structure used therefor.
[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]
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1
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
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]
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.
[0006]
On the other hand, as a set device of a finished product including such a display device, for
example, examples of such a set device include a TV, a computer monitor, and an advertising
billboard.
[0007]
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.
[0008]
Generally, companies that manufacture display devices such as liquid crystal display devices or
organic light emitting diode display devices produce only display panels or display devices, and
by assembling speakers manufactured by separate companies that produce speakers into the
display devices, Finally, a set device for outputting video and sound was realized.
[0009]
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FIG. 1 is a schematic plan view of a speaker included in a conventional display device.
[0010]
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.
[0011]
In this case, since the traveling direction of the sound generated through the speaker 2 is not the
front of the display panel on which the video is displayed but the rear or the lower side of the
display panel, the sound is directed to the viewer viewing the video in front of the display device
1 There is a problem of obstructing the viewer's immersion because it does not progress.
[0012]
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.
[0013]
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.
[0014]
On the other hand, recently, there has been proposed a technology for outputting sound by
vibrating a display panel or a diaphragm attached to the display panel with an actuator, but such
a sound output method is for generating sound other than the display panel. Furthermore, there
is a problem that the method of fixing the sound generating actuator to the support structure of
the display is complicated.
[0015]
Therefore, there is a need to develop a structure for fixing an actuator that vibrates a display
panel or a diaphragm to generate sound to a display device.
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[0016]
The present invention is intended to solve the above-mentioned conventional problems, and an
object of the present invention is to provide a display capable of generating a panel vibration
type sound which directly vibrates a display panel constituting a display device to generate
sound. It is in providing an apparatus.
[0017]
Another object of the present invention is to provide a display device capable of reducing the
thickness while having excellent sound generation performance.
[0018]
Still another object of the present invention is to provide a sound generating actuator fixing
device capable of maintaining the strength of the actuator support structure even during long
operation, and a display device including the same.
[0019]
Still another object of the present invention is to provide a sound generation actuator fixing
device capable of increasing sound pressure while maintaining sound characteristics in the entire
frequency band, and a display device including the same.
[0020]
In order to achieve the above object, the display device according to the present embodiment is
inserted into a display panel for displaying an image, a cover bottom for covering and supporting
at least a rear surface of the display panel, and a support hole provided in the cover bottom. And
two or more sound generating actuators arranged so as to contact the one surface of the display
panel to vibrate the display panel to generate sound and two or more sound generating actuators
so as to be adjacent to each other It can be configured to include an actuator fixing device that is
supported in a fixed manner and fixed to the cover bottom.
[0021]
At this time, the actuator fixing device includes a first support portion for supporting the first
actuator, a second support portion for supporting the second actuator, and a reinforcing rib
portion disposed adjacent to the first support portion and the second support portion. And a
mold structure including a plurality of mounting holes for fixing to the cover bottom.
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[0022]
In addition, the reinforcing rib portion can include one or more longitudinally extending rib
portions extending in the longitudinal direction connecting the two actuators, and more
specifically, the first extending portion extending in the longitudinal direction from the outer
periphery of the first supporting portion and the second supporting portion 1) Even including a
longitudinal rib portion, a second longitudinal rib portion longitudinally connecting the first
support portion and the second support portion, and a transverse rib portion extending
perpendicularly to the second longitudinal rib portion good.
[0023]
In addition, the first support portion and the second support portion respectively support only a
part of the rear surface of the first actuator and the second actuator, and the rear central
portions of the first actuator and the second actuator are exposed to the outside of the actuator
fixing device. It may be an open structure.
[0024]
Also, the separation distance (d) defined as the minimum distance between the first support and
the second support may be smaller than the size (diameter) of the actuator.
[0025]
The actuator fixing device may further include a pem nut fixed to a cover bottom which is a rear
surface support structure of the display device, and the actuator fixing device may be fixed to the
pem nut by a fixing bolt inserted into the mounting hole.
[0026]
According to another embodiment of the present invention, there is provided an apparatus for
fixing two or more sound generating actuators for generating sound by vibrating the display
panel in contact with a display panel displaying an image, the first actuator comprising: A second
support portion for supporting the second actuator, a reinforcing rib portion disposed adjacent to
the first support portion and the second support portion, and a rear surface support structure for
the display device. An actuator securing device is provided that includes a plurality of mounting
holes for securing with a cover bottom.
[0027]
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According to an embodiment of the present invention, when configuring a display device
including a panel vibration type acoustic generation device, two acoustic generation actuators are
inserted and fixed adjacent to a support hole formed in a support structure of the display device.
By providing a fixed structure, the thickness of the display can be reduced while generating
excellent sound with high sound pressure.
[0028]
Also, by providing an actuator fixing device for supporting two sound generating actuators so as
to be adjacent to each other, and by providing a plurality of ribs between each actuator support,
the strength of the actuator support structure even during long operation is provided. Can be
maintained.
[0029]
In addition, with an actuator fixing device that supports two acoustic generating actuators so as
to be adjacent to each other, the separation distance between the two actuators is limited to a
certain range in relation to the size of each actuator, thereby The sound pressure can be
increased while maintaining the acoustic characteristics of
[0030]
It is a schematic top view with respect to the speaker contained in the conventional display
apparatus.
FIG. 2A is a plan view, and FIG. 2B is a cross-sectional view of a display device including a panel
vibration type sound generator to which the present embodiment can be applied.
It is a perspective view illustrating the actuator fixing device by this embodiment, and the fixing
structure to the cover bottom which is a support structure of a display.
FIG. 4a is a perspective view of one direction, FIG. 4b is a plan view, and FIG. 4c is a perspective
view of the other direction.
In the actuator fixing device according to the present embodiment, the separation distance (d)
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between two actuators is illustrated.
It is sectional drawing which illustrates an example of the structure of the sound generation
actuator used for this embodiment.
A state in which a sound generation actuator that can be used in the present embodiment
vibrates the display panel to generate sound is illustrated.
The structure of the baffle part arrange | positioned between the cover bottom which is a
support structure in the display apparatus by this embodiment, and a display panel is illustrated.
FIG. 9a is a view for explaining an acoustic output characteristic when the sound generation
actuator fixing device according to the present embodiment is used, and FIG. 9a shows an
actuator mounting configuration in a form to be compared with the present embodiment; It is the
graph which contrasted the sound output characteristic in the attachment structure of FIG. 9a,
and this embodiment.
It is a graph which shows the effect at the time of using the rib part of the actuator fixing device
by this embodiment.
It is a graph which shows the acoustic output characteristic according to the separation distance
between both actuators by the actuator fixing device by this embodiment.
[0031]
Hereinafter, some embodiments of the present invention will be described in detail through
exemplary drawings.
When adding reference symbols to components in each drawing, the same components 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.
[0032]
Moreover, in describing components of the present invention, terms such as first, second, A, B,
(a), (b) are 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,
that component can be directly connected or connected to the other component, but each
component It should be understood that other components may be "intervened" between
elements, or each component may be "connected", "coupled" or "connected" through other
components. .
[0033]
FIG. 2 is a schematic view of a display device including a panel vibration type sound generator to
which the present embodiment can be applied, FIG. 2a is a plan view, and FIG. 2b is a crosssectional view.
[0034]
As shown in FIG. 2, the display device according to the present embodiment contacts the display
panel 100 for displaying an image, a cover bottom (Cover Bottom; 300) which is a rear surface
support structure of the display device, and one surface of the display panel. It can be configured
to include two adjacently arranged sound generating actuators 200, 200 'that vibrate the display
panel to generate sounds, and an actuator fixing device 1000 that fixes the two adjacent sound
generating actuators.
[0035]
Hereinafter, the sound generation actuators 200 and 200 'will be simply referred to as actuators.
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[0036]
As described in more detail in FIG. 6 and the like, the sound generating actuator 200 surrounds
the magnet, a plate for supporting the magnet, a center pole projecting from the central region of
the plate, and the periphery of the center pole. And a coil on which a coil for applying a current
for sound generation is wound is disposed, and a tip end of the bobbin is arranged to be in
contact with one surface of the display panel.
[0037]
The actuator fixing device 1000 is a fixing structure for supporting two adjacent actuators to fix
them with the rear surface support structure of the display device in order to increase the
generated acoustic intensity, that is, the sound pressure. This will be described in detail below
with reference to FIG.
[0038]
Also, as shown in FIG. 2b, the display device can include a support structure for supporting one
or more of the back surface or the side surface of the display panel, and the sound generating
actuator fixing device 1000 is fixed to the support structure of the display device. Ru.
[0039]
The support structure includes a cover bottom 300 disposed on the rear surface 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.
[0040]
The cover bottom that constitutes the support structure may be a plate member made of a metal
or a plastic material that extends over the entire rear surface of the display device.
[0041]
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
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[0042]
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.
[0043]
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.
[0044]
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.
[0045]
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 sound waves can
be generated by direct vibration by the sound generation actuator 200.
[0046]
More specifically, when the display panel is a liquid crystal display panel, pixels defined in a
plurality of gate lines and data lines and their intersections, and switching elements for adjusting
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the light transmittance of each pixel And an upper substrate including a color filter and / or a
black matrix, and a liquid crystal material layer formed therebetween.
[0047]
Also, in the case where the display panel is an organic electroluminescent (OLED) display panel,
in order to apply a voltage selectively to each pixel and pixels defined in a plurality of gate lines
and data lines and their intersections. 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.
[0048]
Although the display panel used in the display device according to the present embodiment is not
limited in its form, an organic electroluminescent display panel is more preferable for the
following reasons.
[0049]
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
image.
[0050]
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.
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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.
[0051]
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.
[0052]
In the display device according to the present embodiment, the air gap space 600 (A / G), which
is a space disposed between the cover bottom 300 or the middle cabinet 500 that is the support
structure and the display panel to transmit the generated sound waves. It may further include a
baffle portion 400 for forming.
[0053]
That is, by closely bonding the display panel to the cover bottom at the edge of the air gap space
(A / G), the air gap space between the display panel and the cover bottom is formed, and the
actuator vibrates the display panel. The generated sound waves can be maintained or propagated
through the air gap 600 (A / G) space.
[0054]
That is, the baffle portion 400 is disposed at the edge of the cover bottom or middle cabinet, and
blocks the space between the bottom surface of the display panel and the support structure of
the display device (cover bottom or middle cabinet) to generate sound according to display panel
vibration. Means a member that defines an air gap space that allows for
[0055]
In the display panel vibration type display device as in this embodiment, the strength of sound
generated, that is, the sound pressure is determined according to the output or the size of the
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actuator that vibrates the display panel 100.
[0056]
On the other hand, in order to increase the output of the actuator, the size of the actuator must
be increased, and in such a case, problems such as an increase in the overall thickness of the
display may occur.
[0057]
Therefore, a plurality of actuators can be used which are provided with the same control signal in
order to generate sound having a certain sound intensity (sound pressure) while keeping the
thickness of the display thin.
[0058]
On the other hand, when a plurality of actuators operating in the same manner are spaced apart,
the acoustic output characteristics may be degraded due to the interference or resonance
phenomenon of the sound waves generated by the actuators.
[0059]
Therefore, when arranging a plurality of actuators to increase the sound pressure, it is necessary
to arrange a plurality of actuators adjacent to each other in order to maintain the acoustic
characteristics.
[0060]
However, even if two or more actuators are arranged adjacent to each other, if two actuators are
separated, interference and delay phenomena between the actuators cause strong sound
pressure at a specific frequency, so-called dip (Dip.
) Phenomenon may occur.
[0061]
Therefore, the present embodiment provides an actuator fixing device 1000 capable of integrally
supporting two or more actuators adjacent to each other and fixing it to the support structure
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(cover bottom) of the display device.
[0062]
From this point of view, the configuration of the display device according to the present
embodiment will also be described. The panel vibration type sound generation display device
according to the present embodiment covers the display panel 100 displaying an image and at
least the rear surface of the display panel. A cover bottom 300 as a rear surface support
structure to be supported and a support hole 310 provided in the cover bottom are inserted so
that the tip is arranged to be in contact with one surface of the display panel to vibrate the
display panel to generate sound. The actuator fixing device 1000 can be configured to integrally
support two or more sound generating actuators 200 and 200 ′ and two or more sound
generating actuators so as to be adjacent to each other and to fix the cover bottom.
[0063]
The detailed configuration according to this embodiment will be described in more detail with
reference to FIGS. 3 to 8.
Hereinafter, for convenience, the sound generating actuator will be described as including two
actuators, a first actuator 200 and a second actuator 200 ', but it is not limited thereto.
[0064]
FIG. 3 is a perspective view illustrating an actuator fixing device according to the present
embodiment and a fixing structure to a cover bottom which is a support structure of the display
device. FIG. 4 is a diagram showing the actuator fixing device according to the present
embodiment and the actuator coupled FIG. 4a is a perspective view in one direction, FIG. 4b is a
top view, and FIG. 4c is a perspective view in the other direction.
[0065]
As shown in FIG. 3, the actuator fixing device 1000 used in the present embodiment is an
integrated fixing structure in which the first actuator 200 and the second actuator 200 ′ are
fixed and supported so as to be adjacent to each other.
[0066]
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Such an actuator fixing device 1000 may be a mold structure capable of manufacturing a
material such as plastic by a molding method, but is not limited thereto.
[0067]
More specifically, the actuator fixing device 1000 according to the present embodiment includes
a first support 1120 supporting the first actuator 200, a second support 1220 supporting the
second actuator 200 ', a first support and a first support. A reinforcing rib portion 1400 disposed
adjacent to the two supporting portions and a plurality of mounting holes 1310-1340 for fixing
to the cover bottom can be included.
[0068]
The first support 1120 is a cylindrical structure supporting a part of the side surface and a part
of the rear surface of the first actuator 200, and a part of the rear of the first actuator is
accommodated inside the first support. The first housing 1110 is formed.
[0069]
Similarly, the second support portion 1220 is a cylindrical structure supporting a part of the side
surface and a part of the rear surface of the second actuator 200 ', and an inner side of the
second support portion is one of the rear of the second actuator. A second accommodating
portion 1210 in which the portion is accommodated is formed.
[0070]
The first support 1120 and the second support 1220 may be formed of two or four arc-shaped
protrusions, and the tip of each protrusion is bent inward to support a part of the rear surface of
each actuator. By doing this, the actuator is prevented from being detached outside the actuator
fixing device.
[0071]
On the other hand, while maintaining the rigidity of the actuator fixing device 1000, the
deformation of the actuator fixing device can be prevented even during long-term use, and the
first supporting portion and the second support can be used to maintain a constant distance
between two or more actuators. A plurality of reinforcing rib portions can be formed in the
vicinity of the support portion.
[0072]
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More specifically, the reinforcing rib portion 1400 vertically connects the first support portion
and the second support portion with the first longitudinal rib portion 1410 extending in the
longitudinal direction from the outer periphery of the first support portion and the second
support portion. And a transverse rib portion 1430 extending perpendicularly to the second
longitudinal rib portion.
[0073]
In this specification, the long side direction in which two actuators are arranged is expressed as
the vertical direction, and the short side direction perpendicular thereto is expressed as the
horizontal direction.
[0074]
The first longitudinal rib portion 1410 is longitudinally extended from the outside of the first
support portion 1120 and the second support portion 1220 to form an outer circumferential
structure of the actuator fixing device in the longitudinal direction.
[0075]
At this time, the central region of the first longitudinal rib portion 1410, ie, the central region
between the first support portion 1120 and the second support portion 1220, is higher in height
than both side regions of the first longitudinal rib portion 1410. It may be formed higher, or the
thickness of the rib may be formed thicker.
[0076]
Therefore, even if the two actuators vibrate with high power for a long time, the deformation of
the fixing device of the actuators is prevented, and the change in relative position between the
two actuators and the display panel is minimized.
[0077]
On the other hand, one or more second vertical rib portions 1420 integrally connected to the
first support portion 1120 and the second support portion 1220 are disposed inside the first
vertical rib portion 1410.
[0078]
Although FIG. 3 and FIG. 4 illustrate that two second longitudinal rib portions 1420 are disposed,
the present invention is not limited thereto, and one or three or more second longitudinal rib
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portions 1420 may be formed. It is good.
[0079]
In addition, between the two second longitudinal ribs 1420 or between the two first longitudinal
ribs 1410, at least one transverse rib 1430 which is integrally connected to the longitudinal rib
and extends in the lateral direction is provided. It is formed.
[0080]
FIGS. 3 and 4 illustrate that one transverse rib 1430 is included, and in FIG. 3 the structure in
which the transverse rib 1430 extends between the two second longitudinal ribs 1420 is
illustrated. 4b illustrates the structure in which the transverse rib portion 1430 extends between
the two first longitudinal rib portions 1410.
[0081]
Also, as shown in FIG. 4 b and FIG. 10 a etc, one or more diagonally extending rib portions 1440
may be further formed between the first support portion or the second support portion and the
first longitudinal rib portion 1410.
As a result, such diagonal rib portions 1440 can be extended obliquely to one side of the display
panel.
[0082]
As described above, in the actuator fixing device 1000 according to the present embodiment, by
forming the reinforcing rib portion including the plurality of rib portions extending in the
longitudinal direction, the lateral direction, and the oblique line direction, the two actuators
perform strong vibration for a long time. Even in this case, the actuator can be strongly
supported, and as a result, the deformation of the fixing device of the actuator can be prevented,
and the change in relative position between the two actuators and the display panel can be
minimized.
[0083]
This makes it possible to minimize changes in acoustic characteristics due to long-term
operation, and the experimental results will be described in more detail in FIG.
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[0084]
Thus, the reinforcing rib portion 1400 formed in the actuator fixing device according to the
present embodiment includes at least one or more longitudinal rib portions arranged in the
longitudinal direction connecting two actuators.
[0085]
In addition, when the reinforcing rib portion 1400 is asymmetrical, a difference in the amount of
deflection of the actuator fixing device may occur at high or low temperature and the acoustic
characteristics may be deteriorated. Therefore, the reinforcing rib portion 1400 according to the
present embodiment is overall. It is preferable that the upper and lower sides be symmetrical.
[0086]
As described above, in the case of a general speaker, if a thin diaphragm (paper, PP, etc.) is used,
the sound pressure will be sufficient. However, as in this embodiment, when using a display
panel as a diaphragm Because of the weight and thickness of the display panel, the sound
pressure basically drops, making commercialization difficult.
[0087]
Therefore, in the display panel direct vibration type display device, a structure has been
proposed in which a plurality of actuators controlled in the same manner are connected in series
in order to increase the sound pressure.
[0088]
However, simply arranging a plurality of actuators in series not only makes it difficult to maintain
uniform contact characteristics between the actuators and the display panel, but also causes a
problem that sound quality is degraded due to interference between the actuators and a delay
phenomenon.
[0089]
Therefore, by providing an actuator fixing device, which is a device for fixing and supporting two
or more actuators adjacent to each other in the present embodiment and fixing to a cover bottom
which is a rear surface support structure of a display device, as described above. Solve the
problem.
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[0090]
At this time, the first support portion 1120 and the second support portion 1220 support only a
part of the rear surface of the first actuator 200 and the second actuator 200 ', respectively, and
the center of the rear surface of the first actuator 200 and the second actuator 200' It is
preferable that the part has a structure exposed to the outside of the actuator fixing device.
[0091]
That is, as shown in FIG. 4a, the tips of the protrusions of the first support 1120 and the second
support 1220 are slightly bent inward to support only a part of the rear surface of each actuator.
The central portion of the rear surface of the actuator 200, 200 'is exposed to the outside.
[0092]
As shown in FIG. 2b, the gap G of the air gap space 600 between the display panel 100 and the
cover bottom 300 is extremely small, about 0.9 mm or less, due to the recent trend of thinning
the display device.
[0093]
On the other hand, in the structure according to the present invention in which sound waves are
generated by the display panel vibrating, the compression and relaxation characteristics of air in
the air gap space may affect the vertical vibration of the actuator, and the air gap space is small.
In such cases, there is a problem in which such effects become significant.
[0094]
That is, an air damping phenomenon occurs, which is a phenomenon in which the compression /
relaxation characteristics of air restrict the vertical vibration motion of the actuator due to the
narrow air gap space and the operation performance of the actuator is degraded.
[0095]
Therefore, in the present embodiment, the first support portion 1120 and the second support
portion 1220 support only a part of the rear surface of the first actuator 200 and the second
actuator 200 ', respectively, and the first actuator 200 and the second actuator 200' By having a
so-called open structure in which the central portion of the rear surface is exposed to the outside
of the actuator fixing device, it is possible to provide the effect of suppressing the air damping
phenomenon described above by increasing the amount of insufficient air in the air gap space.
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[0096]
Also, in the actuator fixing device 1000 according to the present embodiment, the distance
between the two actuators affects the characteristics of the generated sound, so the distance
between the two actuators or the distance between the first support and the second support It is
necessary to optimize the separation distance (d) between
[0097]
As shown in FIG. 5, the separation distance (d), defined as the shortest distance between the first
support 1120 and the second support 1220, is greater than the minimum threshold due to the
formation of the reinforcing rib. And preferably less than a maximum threshold, which is the size
of the first actuator or the second actuator.
[0098]
Similarly, in the present embodiment, the distance between the first actuator 200 and the second
actuator 200 'may be smaller than the size (diameter) of each actuator 200, 200'.
[0099]
More specifically, the smaller the separation distance (d) between the first support 1120 and the
second support 1220, the better the sound quality characteristics, but in order to secure the
minimum thickness for the reinforcing rib to function. The separation distance (d) between the
first support 1120 and the second support 1220 should be greater than the minimum threshold
of about 7 mm.
[0100]
Also, when the separation distance (d) between the first support 1120 and the second support
1220 becomes larger than the minimum threshold value, the sound quality characteristics
slightly change, but the first support 1120 and the second support Although the change of the
sound quality characteristics is not large to the extent that the separation distance (d) between
the unit 1220 and the size (D) of the actuator is equal to or less than the size (D) of the actuator,
between the first support 1120 and the second support 1220 It has been confirmed that the
sound quality characteristics drop sharply when the separation distance (d) of the distance d
exceeds the size D of the actuator.
[0101]
Therefore, in the present embodiment, the separation distance (d) between the first support
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portion 1120 and the second support portion 1220 of the actuator fixing device 1000 is smaller
than the size (D) of the actuator, whereby the sound quality can be improved. There is an effect
that the reduction can be minimized, and the experimental results will be described in more
detail below with reference to FIG.
[0102]
In addition, the actuator fixing device 1000 according to the present embodiment may have a
plurality of mounting holes for fixedly coupling with the cover bottom, and in the embodiment of
FIGS. The structure in which the mounting holes 1310 to the fourth mounting holes 1340 are
formed is illustrated.
[0103]
In addition, as shown in FIG. 3, the actuator fixing device 1000 may further include a pem nut
330 fixed to the cover bottom 300, and the actuator fixing device 1000 may be fixed to the pem
nut by a fixing bolt 320 inserted into the mounting holes 3130 to 1340.
[0104]
The term "pemnut" is used herein to mean the same as a self-clinching nut, and for convenience
only the term "pemnut" is used hereinafter.
[0105]
Also, although not shown in the drawings, the pemnut 330 can be fixed to the cover bottom by
being coated at its tip end after one side is pressed into the pemnut fixing hole formed in the
cover bottom 300.
[0106]
On the other hand, since a screw through hole is formed on the inner surface of the pem nut
330, the actuator fixing device 1000 is covered by bottoming by tightening the fixing bolt 320
after aligning the mounting hole of the actuator fixing device with the screw through hole of the
pem nut. It can be fixed at 300.
[0107]
The use of such a pem nut 330 can partially prevent strong vibration of the actuator from being
transmitted to the cover bottom.
11-05-2019
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[0108]
That is, when the actuator fixing device 1000 is immediately brought into contact with the cover
bottom without the pem nut 330, the strong vibration generated during the operation of the
actuator is transmitted to the cover bottom for a long time, whereby the cover bottom made
relatively thin is bent or There is a possibility of problems being transformed.
[0109]
On the other hand, if the pemnut 330 is used as in the present embodiment, the vibration
generated by the actuator is partially absorbed by the pemnut, and as a result, the vibration
transmitted to the cover bottom can be minimized.
[0110]
In addition, if the above-described pemnut 330 is used, there is an advantage that it is possible to
solve the problem that the cover bottom is thin and the fixing force is not sufficient when the
fixing bolt is directly screwed to the cover bottom.
[0111]
That is, without the pem nut 300, the fixing bolt passing through the screw hole formed in the
mounting hole of the actuator fixing device must be directly screwed and fixed to the screw hole
formed in the cover bottom. If the thickness of the cover bottom is large, there is no problem in
bonding, but if the thickness of the cover bottom is thin, there arises a problem that the bonding
strength is not sufficient.
[0112]
Therefore, after the pemnut 330 is fixed to the cover bottom by press-fitting / coking method in
advance as described above, then the actuator fixing device is connected to the pemnut, a
sufficient bonding force is secured even when the thickness of the cover bottom is thin. become
able to.
[0113]
Hereinafter, the detailed structure of the actuator that can be used in the present embodiment
and the principle of sound generation due to the vibration of the actuator will be described in
detail.
11-05-2019
22
[0114]
FIG. 6 is a cross-sectional view illustrating an example of the structure of the sound generation
actuator used in the present embodiment, and FIG. 7 illustrates a state in which the sound
generation actuator usable in the present embodiment vibrates the display panel to generate
sound. Do.
[0115]
The first sound generating actuator 200 and the second sound generating actuator 200 ′ used
in the present embodiment have the same structure, and in the following, the first sound
generating actuator 200, which is one of them, will be described as a representative.
[0116]
The sound generating actuator 200 used in the present embodiment includes a magnet 220
which is a permanent magnet, a plate 210 supporting the magnet, a center pole 230 projecting
in a central region of the plate, and a periphery of the center pole 230. And a coil 260 wound
around the outer periphery of the bobbin and to which a current for generating sound is applied.
[0117]
On the other hand, the sound generating actuator used in the present embodiment includes both
the first type of structure in which the magnet is disposed outside the coil and the second type of
structure in which the magnet is disposed inside the coil. FIG. 6 illustrates a first type of structure
in which the magnet is located on the outside of the coil.
[0118]
An acoustic generating actuator with such a first type of construction can be referred to as an
external magnet type.
The lower plate 210 is accommodated and fixed to the first support 1120 of the actuator fixing
device, and a magnet 220 which is an annular permanent magnet is disposed on the outer
periphery of the lower plate.
[0119]
A top plate 210 'is disposed on the top of the magnet 220, and an outer frame 240 protruding
11-05-2019
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from the top plate is disposed on an outer periphery of the top plate.
[0120]
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.
[0121]
A coil 260 is wound around the lower side of the bobbin 250, and an acoustic current is applied
to the coil.
[0122]
Meanwhile, a damper 270 may be disposed between a portion of the upper side of the bobbin
and the outer frame 240.
[0123]
The lower plate 210 is circularly provided as shown in FIG. 3a, and the ring-shaped magnet 220
is provided on the lower plate 210, and the upper plate 210 'is provided on the magnet.
[0124]
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.
[0125]
On the other hand, the center pole 230 and the lower plate 210 may be integrally formed.
[0126]
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.
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Such a bobbin and a coil can be combined and expressed as a voice coil.
[0127]
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.
[0128]
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.
[0129]
The magnet 220 may be a sintered magnet such as barium ferrite, and the material is 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.
[0130]
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 270 is provided in a bellows structure so that the
bobbin vibrates up and down while contracting and relaxing by the up and down 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.
Such dampers can be expressed in other terms, such as edges.
11-05-2019
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[0131]
In addition, a vibration transmission member 280 may be disposed at the tip of the bobbin 250
for bonding the bobbin and the display panel 100 while transmitting the vibration of the bobbin
to the display panel.
[0132]
Such a vibration transmitting member 280 is a ring-shaped plate-like member, and adhesive
surfaces are formed on both sides, one surface of which is bonded to the tip of the bobbin, and
the other surface can be bonded to the display panel.
[0133]
The actuator used in the present embodiment is not limited to the external magnet type as shown
in FIG. 6, but a micro type or internal magnet type actuator in which the magnet is disposed
inside the coil can also be used. However, for convenience, the description of the structure of the
inner magnetic actuator is omitted.
[0134]
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. 6, and other types can be used as long as
the display panel can be vertically vibrated by current application to generate sound. The
actuator of may be used.
[0135]
FIG. 7 illustrates a sound generation actuator that can be used in the present embodiment
vibrates the display panel to generate sound.
[0136]
FIG. 7a shows a state in which a current is applied.
The center pole connected to the lower surface of the magnet is an N pole, and the upper plate
connected to the upper surface of the magnet is an S pole, and an external magnetic field is
formed between the coils.
11-05-2019
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[0137]
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.
[0138]
Therefore, as shown in FIG. 7A, the bobbin moves upward, and the display panel in contact with
the tip of the bobbin vibrates upward.
[0139]
In this state, if the current application is stopped or a current in the opposite direction is applied,
the force to move the bobbin downward is generated according to the similar principle as shown
in FIG. Swing to the side.
[0140]
As described above, the display panel vibrates up and down depending on the direction of
current application to the coil and the size, and such a vibration generates a sound wave.
[0141]
FIG. 8 illustrates the structure of the baffle portion disposed between the cover bottom, which is
a support structure in the display device according to the present embodiment, and the display
panel.
[0142]
In the panel vibration type sound generating apparatus according to the present embodiment, an
air gap 600 which is a space in which the panel can be vibrated by the sound generating actuator
200 is secured between the display panel 100 and the support structure (cover bottom; 300 etc.)
There must be.
[0143]
In addition, 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, in particular if the
generated sound is leaked to the outside through the side surface of the display It does not.
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[0144]
For this purpose, in the display device according to the present embodiment, a certain baffle
portion 400 is formed between the lower surface of the display panel and the cover bottom
which is a support structure.
[0145]
More specifically, a fixed section (ie, an air gap space) around the sound generating actuator is
defined, and the edge of the section has a baffle portion between the lower surface of the display
panel and the upper surface of the middle cabinet or cover bottom. The baffle portion 400
includes an adhesive member 412 such as double-sided tape adhered between the bottom
surface of the display panel and the upper surface of the support structure of the display, and a
sealing portion 414 further disposed on the outer periphery of the adhesive member. It is
preferable to comprise.
[0146]
At this time, the section in which the baffle portion is formed may be the entire display panel
area defined by the four sides of the outer periphery of the display panel, but is not limited
thereto.
[0147]
As shown in FIG. 8, 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.
[0148]
The middle cabinet 500 is a frame-shaped member formed along the outer periphery of the
display panel, and includes a horizontal support portion on which a part of the display panel is
seated and a cover bottom which is bent on both sides from the horizontal support portion. And a
vertical support that covers the side surface of the display panel and the side surface of the
display panel.
[0149]
Such a middle cabinet 500 constitutes the side appearance of the display or setting device and
may optionally not be used or be integrally formed with the cover bottom.
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[0150]
According to the embodiment of FIG. 8, 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.
[0151]
In addition, the sealing portion 414 constituting the baffle portion is further disposed on the
outer periphery of the adhesive member, and preferably has a thickness or height larger than the
thickness or height of the adhesive member at the time of non-compression when not
compressed.
[0152]
The sealing portion 414 can be made of a highly elastic material such as rubber, and has a
thickness t2 larger than the thickness (t1) of the adhesive member 412 when not compressed, as
shown in FIG. 7b.
[0153]
That is, as shown in FIG. 8, one surface of the adhesive member 412, which is a double-sided
tape having a thickness t1, is adhesively disposed on the inner portion of the upper surface of the
horizontal support of the middle cabinet 500, and the thickness is larger than t1 on the outer
periphery of the adhesive member. A sealing part 414 of elastic material having
[0154]
In this state, when the display panel 100 is attached to the adhesive surface of the adhesive
member 412, the sealing portion 414 having a larger thickness adheres to the display panel and
the middle cabinet while being compressed to a certain extent.
[0155]
Therefore, the encapsulation of the air gap area around the sound generating actuator can be
further improved.
[0156]
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As a result, as shown in FIG. 8, the display panel 100 is formed by connecting the display panel
100 and the cover bottom 300 while forming the air gap 600 of the thickness of the horizontal
support portion of the middle cabinet and the bonding member 412. While being able to secure
the vibration space which can generate sound, it can prevent that the sound wave generated
inside flows out outside along the side of a display.
[0157]
In particular, the air gap space is formed by forming the baffle portion 400 disposed at the edge
of the air gap space into a double structure of the bonding member 412 and the sealing portion
414 and forming a thicker sealing portion when not compressed. Can be further improved to
further block the outflow of sound.
[0158]
The middle cabinet 500 herein may 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., with
multiple 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
support the display panel and the baffle portion.
[0159]
On the other hand, as described above, a middle cabinet may be used to support between the
cover bottom and the display panel.
Such a middle cabinet may not necessarily have a necessary structure, and the baffle may be
disposed between the upper surface of the cover bottom 300 and the lower surface of the display
panel when the middle cabinet is not used.
[0160]
FIG. 9 is for explaining the sound output characteristics when the sound generation actuator
fixing device according to the present embodiment is used.
[0161]
More specifically, FIG. 9a illustrates an actuator mounting configuration of a form to be
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compared with the present embodiment, and FIG. 9b is a graph comparing the mounting
structure of FIG. 9a with the acoustic output characteristics in the present embodiment.
[0162]
As described above, in a display device in which the display panel is directly vibrated to generate
sound, it is possible to adopt a structure in which two or more sound generating actuators having
the same characteristic are disposed adjacent to each other in order to increase sound pressure.
[0163]
FIG. 9a shows a structure in which two actuators 200, 200 'are simply disposed adjacent to each
other without the actuator fixing device as in this embodiment.
[0164]
The broken line in FIG. 9b is a case where two actuators are fixed adjacently and separately
without separate actuator fixing devices as shown in FIG. 9a, and the dip in which the sound
pressure sharply increases in the 800 to 900 Hz band (Dip.
) Phenomenon occurs.
[0165]
Such a dip phenomenon is a phenomenon in which strong sound pressure is generated at a
specific frequency due to interference between sound waves generated by actuators that are
individually fixed and a delay phenomenon, and it is recognized as a deterioration in the overall
sound quality.
[0166]
On the other hand, the solid line in FIG. 9b is an acoustic output characteristic when the actuator
fixing device 1000 for fixing two actuators integrally as in this embodiment is used, and a dip in
which sound pressure abnormally increases at a constant frequency (Dip.
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) It can be seen that the phenomenon is substantially eliminated.
[0167]
As described above, when the actuator fixing device 1000 according to the present embodiment
is used, uniform sound pressure can be generated in all frequency bands, and excellent sound
output characteristics can be realized.
[0168]
FIG. 10 is a graph showing an effect when the rib portion of the actuator fixing device according
to the present embodiment is used.
[0169]
As shown in FIG. 10a, as described above, the actuator fixing device 1000 according to the
present embodiment includes two first longitudinal rib portions 1410, two second longitudinal
rib portions 1420, a transverse rib portion 1430, and diagonal hatch ribs. The portion 1440
includes a reinforcing rib portion 1400 including one or more.
[0170]
FIG. 10b illustrates an acoustic output characteristic when the actuator fixing device configured
by only the first support and the second support simply fixing the two actuators is used without
the reinforcing rib portion according to the present embodiment. It is a thing.
The broken line in FIG. 10b indicates the first sound output characteristic, and the solid line
indicates the sound output characteristic after operation for 240 hours or more.
[0171]
As shown in FIG. 10b, when the reinforcing rib portion according to the present embodiment is
not used, it can be seen that the acoustic output characteristics change as the operation time
elapses, which means that the actuator fixing device is deformed by the actuator vibration for a
long time It is predicted that it is attributable to being
[0172]
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On the other hand, FIG. 10 c shows the case where the actuator fixing device including the
reinforcing rib portion according to the present embodiment is used, and the first acoustic output
characteristic (the solid line in FIG. It can be seen that the broken line in FIG.
[0173]
As described above, in the actuator fixing device 1000 according to the present embodiment, by
forming the reinforcing rib portion including the plurality of rib portions extending in the
longitudinal direction, the lateral direction, and the oblique line direction, the two actuators
perform strong vibration for a long time. Even if the actuator maintains its rigidity, it can
minimize the change in relative position between the two actuators and the display panel, and
consequently minimize the change in acoustic characteristics following long-term operation.
Have the effect of
[0174]
FIG. 11 is a graph showing an acoustic output characteristic according to the separation distance
(d) between both actuators in the actuator fixing device according to the present embodiment.
[0175]
As described in FIG. 5, when the size (diameter) of the first actuator 200 and the second actuator
200 ′ is D, the separation distance which is the minimum distance between the first support
1120 and the second support 1220. d must be greater than approximately 7 mm, which is the
minimum threshold for the formation of the stiffening ribs, and smaller than the size D of the
actuator, and FIG. 11 is intended to illustrate the reason.
[0176]
As shown in FIG. 11, when the separation distance d which is the minimum distance between the
first support portion 1120 and the second support portion 1220 is about 7 mm, excellent
acoustic output characteristics having uniform sound pressure in all frequency bands are
obtained. 11, the acoustic output characteristics change as the separation distance d increases,
but the separation distance d is about 0.85 D (about 23, 6 mm) slightly smaller than about 28
mm which is the size (D) of the actuator. In the case of), it can be seen that the change in the
sound quality characteristic is not large (solid line in FIG. 11).
[0177]
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On the other hand, the separation distance d, which is the minimum distance between the first
support 1120 and the second support 1220, is larger than the size D (= 28 mm) of the actuator,
and is about 30 mm (about 1.1.
If it becomes D), it is understood that the dip phenomenon in which the sound pressure increases
at the specific frequency starts to occur (one-dot chain line in FIG. 11).
[0178]
Therefore, in the present embodiment, the acoustic output characteristic is excellent by making
the separation distance (d) between the first support portion 1120 and the second support
portion 1220 of the actuator fixing device 1000 smaller than the size (D) of the actuator. To
maintain the
[0179]
As described above, according to the present embodiment, when configuring a display device
including a panel vibration type acoustic generation device, two acoustic generation actuators are
inserted so as to be adjacent to the support holes formed in the support structure of the display
device. By providing an actuator fixing device that is a fixing structure that allows the sound to
be fixed, the thickness of the display device can be reduced while generating excellent sound
with high sound pressure.
[0180]
Also, by providing an actuator fixing device for supporting two sound generating actuators so as
to be adjacent to each other, and forming a reinforcing rib portion including a plurality of rib
portions between each actuator support portion, even during long operation The strength of the
actuator support structure can be maintained.
[0181]
In addition, an actuator fixing device that supports two sound generating actuators so as to be
adjacent to each other, the separation distance (d) being the minimum distance between the two
actuator supports to a certain range in relation to the size of each actuator By limiting, the sound
pressure can be increased while maintaining the acoustic characteristics in the entire frequency
band.
[0182]
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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.
[0183]
DESCRIPTION OF SYMBOLS 100 Display panel 200, 200 '1st and 2nd sound generation actuator
300 Cover bottom 400 Baffle part 500 Middle cabinet 1000 Actuator fixing device 1120, 1220
1st and 2nd support part 1310-1340 mounting hole 1400 Reinforcement rib part 1410 1st
Longitudinal rib 1420 Second longitudinal rib 1430 Horizontal rib 330 Pemnut 320 Fixing bolt
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