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JP2004200729

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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 JP2004200729
An electronic apparatus such as a mobile phone is provided with an increased size of a plate-like
display element without miniaturizing a sounding element so that good sounding frequency
characteristics and sounding level in a low tone range can be secured. A liquid crystal display
element 3 is incorporated in a case 1 of a portable telephone so that the display surface is
overlapped with the window 29 area. The transparent protective plate 35 closes the window 29
and covers the display surface side of the liquid crystal display element 3. The rectangular
piezoelectric vibrating element 37 is attached to the end of the protective plate 35. The edge of
the case 1 covers the piezoelectric vibrating element 37. By driving the piezoelectric vibration
element 37, the protection plate 35 is made to sound as a vibration cone. [Selected figure] Figure
1
Display unit with sound generation function
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
display device with a sound generation function, and more particularly to a display device with a
sound generation function suitable for use in a portable telephone, a portable video camera or
other electronic devices that handle images and sounds. . 2. Description of the Related Art At
present, electronic devices handling images and sounds, especially mobile phones, are
explosively popular. In this mobile phone, as shown in FIG. 7, a rectangular liquid crystal display
element 3 and a plurality of characters and numeric keys 5 are arranged on one main surface
(front surface) side of a thin and elongated box-shaped case 1. A configuration in which the
receiver 7 and the transmitter 9 are disposed at both ends in the longitudinal direction 1 is very
general. In FIG. 7, reference numeral 11 denotes an antenna, and reference numeral 13 denotes a
connector used for external power supply and the like. Moreover, the key 5 is disposed in the
case 1 so that the liquid crystal display element 3 can be pressed from the outside so that the
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liquid crystal display element 3 can be seen from the outside, and the receiver 7 and the
transmitter 9 are disposed in the case 1 The sound can be generated to the outside or collected
from the outside through the sound passage 15 provided in the case 1. Although not shown, in
many cases, a sounding element that emits a relatively large ringing tone to notify of an incoming
call is arranged on the opposite main surface (rear surface) side of the case 1. In such a portable
telephone, as it becomes possible to exchange text information and image information in addition
to call voice information, the necessity and demand for displaying a large number of text
information and image information on the liquid crystal display element 3 become stronger.
Therefore, it is desired to increase the size of the liquid crystal display element 3, that is, to
enlarge the image display space. On the other hand, the portable telephone is preferably carried
in a pocket and needs to be disposed apart from the receiver 7 and the transmitter 9 to a certain
extent, so a rectangular or rod form is preferable, and the liquid crystal display element 3 is
enlarged. If the size of the entire case 1 is too large, the portability is impaired. Therefore, the
receiver 7 is made as small as possible, and the liquid crystal display element 3 is made larger
accordingly in the longitudinal direction, that is, in the direction of the receiver 7. FIG. 8 shows
an example of the receiver 7 used for a portable telephone, and the piezoelectric vibrating
element 21 as a sound producing element is obtained by attaching a disk-shaped conductive
diaphragm 19 to one side of a disk-shaped piezoelectric plate 17. The holder 25 is housed so as
to abut on the step in the holder 23, and the lid 25 is fitted from the open side of the holder 23
to hold the periphery of the conductive diaphragm 19 from the holder 23. The projecting flange
27 is a circuit board (not shown).
) And is incorporated in the case 1. Although not shown, a configuration in which a magnetic
speaker is used for the receiver 7 as a sound emitting element is also well known. However, in
the above-described portable telephone, when the size of the piezoelectric or magnetic receiver 7
is reduced in order to increase the size of the liquid crystal display device 3 in the longitudinal
direction, the high frequency range is emphasized. As a result, the low frequency band tends to
have a lowered frequency characteristic, and there is a problem that the sound generation level
also decreases. Further, at present, the receiver 7 is miniaturized to a size of about 10 mm to 13
mm in diameter, and furthermore, when attempting to miniaturize the receiver 7, it is difficult to
manufacture and the miniaturization has reached its limit. At the same time, in the case of the
magnetic type receiver 7, it is possible to suppress the reduction of the sound generation level
including the bass range to some extent by increasing the drive current even if the size is
reduced, but the power consumption increases. Since the use time is short and the manufacture
is also difficult as described above, there is a limit to the miniaturization of both the piezoelectric
and magnetic receivers 7. Further, both of the piezoelectric type and magnetic type receivers 7
have dimensions of 5 mm to 10 mm in the thickness direction, which has been a hindrance in
increasing the size of the liquid crystal display element 3. As a result of careful observation and
examination of the vibration form of the piezoelectric vibration element in addition to the liquid
crystal display element and the peripheral configuration, the present inventor found a plate-like
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display element such as a liquid crystal display element without downsizing the piezoelectric
vibration element. The present invention has been completed by finding a configuration that can
be enlarged. The present invention has been made under such circumstances, and it is possible to
increase the size of a plate-like display element such as a liquid crystal display element without
reducing the size of the sounding element in the electronic device so much. It is an object of the
present invention to provide a display device with a pronunciation function that is easy to obtain
while achieving good tone generation frequency characteristics securing a tone range and being
hard to reduce the tone generation level. Means for Solving the Problems In order to solve such
problems, the present invention is arranged such that the window-like display surface for
displaying the operation of the electronic device faces the outside and is disposed in the
electronic device. It comprises a plate-like display element, a transparent protective plate
covering the display surface so that the display surface can be seen from the outside, and a platelike piezoelectric vibrating element attached to the end of the protective plate to vibrate it. .
Further, in the present invention, preferably, the piezoelectric vibration element is covered by a
case of an electronic device overlapped with an end of the protective plate.
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. The same reference numerals are given to parts
common to the conventional example. FIG. 1 is a perspective view showing a display device with
a sound generation function according to the present invention mounted on a mobile phone as
an audio and image information electronic device. In FIG. 1, the box-shaped case 1 formed by
molding and processing a thin metal plate or a synthetic resin plate has a thin rectangular shape
as a whole, and approximately half of the longitudinal direction on one principal surface (surface)
side A rectangular window (window) 29 is formed to communicate with the inside, and a
plurality of known characters and numeric keys 5 are arranged in a matrix in the other half
region. In the longitudinal direction of the case 1, an antenna 11 is provided so as to project from
the tip on the window 29 side, and a known transmitter 9 is disposed at the tip on the key 5 side
and the end face side A connector 13 used for external power supply and the like is disposed in
FIG. The key 5 is a diaphragm switch or other known element, and is fixed in the case 1 so as to
be able to be pressed from the outside so that the head protrudes from the case 1, and the
transmitter 9 is a piezoelectric type or magnetic type It is an acousto-electrical conversion
element, is disposed in the case 1 and is in communication with the outside through the sound
through hole 15 provided in the case 1, and it is difficult to see in practice. In the case 1, as
shown in FIG. 2, the liquid crystal display element 3 having an image display area of the same
shape as the window 29 or a slightly larger rectangular shape is arranged such that its display
surface overlaps the window 29 area. It is done. The liquid crystal display element 3 has a
conventional color or monochrome display function such as TFT type or DTN type, and displays a
plurality of character strings and images. The circuit board 31 disposed in the case 1 And is
electrically connected to and can be driven. On the display surface side of the liquid crystal
display element 3, it is made of, for example, a polycarbonate resin plate or an acrylic resin plate
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having good transparency through a thin spacer 33 placed at the end, for example, about 60 mm
long and 42 mm wide The rectangular protective plate 35 is overlapped, and the edge of the
window 29 of the case 1 mentioned above is overlapped so as to protrude at the end of the
protective plate 35, and the window 29 is closed. The display image can be seen. The protective
plate 35 is fixed to the display surface side of the liquid crystal display element 3 via a spacer 33,
and the display area is aligned and fitted so as to be seen from the window 29 of the case 1, and
the inside of the window 29 It is also possible to fix it to the case 1 itself and to face the display
surface side of the liquid crystal display element 3 with a slight gap.
As shown in FIG. 3, a rectangular piezoelectric vibrating element 37 having a length of 10 mm, a
width of 40 mm, and a thickness of about 1 mm is provided on the back surface of the protection
plate 35 on one end face side in the longitudinal direction, ie, the antenna 11 side. The lead wire
(not shown) is connected to the circuit board 31 described above, and the edge of the case 1
extends over the piezoelectric vibrating element 37 to overlap and cover the piezoelectric
vibrating element 37. Incidentally, the protective plate 35 shown in FIG. 3 is the one in which the
protective plate 35 of FIG. 1 is shown upside down. As shown in FIGS. 3 and 4, the piezoelectric
vibrating element 37 has rectangular thin electrodes 41 and 43 formed on both main surfaces of
a rectangular piezoelectric plate 39 and is slightly larger than the piezoelectric plate 39. It has a
configuration formed by bonding one electrode 41 to a conductive diaphragm 45 having a
similar shape, and the entire surface of the conductive diaphragm 45 to which the piezoelectric
plate 39 is not bonded is at the end of the protection plate 35. It is pasted. In order to ensure
good vibration of the piezoelectric vibrating element 37, it is preferable to provide a slight gap,
for example, a distance of several micrometers between the piezoelectric vibrating element 37
and the display surface of the liquid crystal display element 3. It is preferable to provide a similar
slight gap between the protective plate 35 and the case 1 in the area of the piezoelectric
vibrating element 37, or at least not press the piezoelectric vibrating element 37 or the holding
plate 35 in pressure contact. Similarly, it is advisable to provide a slight gap between the
protective plate 35 and the display surface of the liquid crystal display element 3 as well. The
piezoelectric vibrating element 37 has a configuration in which the electrodes 41 and 43 are
formed on the piezoelectric plate 39 as shown in FIG. 5 in addition to the configuration in which
the piezoelectric plate 39 is attached to the conductive vibrating plate 45. Alternatively, the
piezoelectric plate 39 may be directly attached to the protective plate 35. In addition to the liquid
crystal display element 3, the key 5, the antenna 11 and the connector 13 are connected to the
circuit board 31 described above, and an electronic circuit (not shown) such as a drive circuit for
driving them. ) Is mounted. When a drive voltage is applied to the piezoelectric vibrating element
37 from a drive circuit formed on the circuit board 31, the piezoelectric vibrating element 37
bends and vibrates to vibrate the protective plate 35, and the protective plate 35 becomes a
vibrating cone. Become pronounced. In the display device with a sound generation function
configured as described above, the liquid crystal display element 3 is disposed in the case 1 of
the mobile phone provided with the window 29 so that the display surface thereof overlaps the
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window 29 area, and the display is performed. A protective plate 35 of good permeability or
transparency is superimposed on the surface side with a slight gap, and a rectangular
piezoelectric vibrating element 37 is attached to the end of the protective plate 35, and the
piezoelectric vibrating element is attached by the edge of case 1 Since it is configured to cover
37, it can be configured simply by attaching a thin plate-like piezoelectric vibrating element 37,
and even if the liquid crystal display element 3 is enlarged, it is necessary to miniaturize the
piezoelectric vibrating element 37 as a vibration source too much. In addition, it is easy to secure
the sound pressure level in the low frequency range and to obtain frequency characteristics that
the high frequency range is not emphasized, and the large protective plate 35 is produced as a
vibrating cone. The wave number characteristic is good.
For example, flat characteristics are obtained over 300 Hz to 3500 Hz. Furthermore, since the
entire protection plate 35 generates sound as a vibrating cone, a large sound generation level can
be secured, and since the sound generation area is wider compared to a small handset of about 1
cm as in the conventional configuration, the user can It has the advantage of being easy to listen
to. Furthermore, since the entire protection plate 35 can be pronounced to secure a large tone
generation level, there is no need to separately arrange a tone generation element for producing
a ring tone on the back side of the case 1, and the number of parts decreases and the placement
space There is also an advantage that can be saved. From the viewpoint of securing a large sound
generation level by the protective plate 35, it is preferable that the driving voltage applied to the
piezoelectric vibrating element 37 be boosted to some extent. Further, since the piezoelectric
vibrating element 37 is simply attached to the protective plate 35 of the liquid crystal display
element 3, the assembly is extremely easy, and any position of the user's ear is not related to the
position of the user. The piezoelectric vibrating element 37 can be attached to the position of (v),
and the degree of freedom in design and assembly is increased. In the configuration described
above, the piezoelectric vibrating element 37 attached to the protective plate 35 is covered with
the edge of the case 1, but the piezoelectric vibrating element 37 does not necessarily have to be
hidden by the case 1. However, covering the piezoelectric vibrating element 37 with the case 1
has an advantage of improving the appearance. In the embodiment of the present invention
described above, the piezoelectric vibrating element 37 is attached to the end on the side of the
antenna 11 in the protective plate 35, but the present invention is not limited to this. For
example, FIG. As shown, the piezoelectric vibrating element 37 (indicated by a one-dot chain line)
is provided at the end on the key 5 side. ) Is possible, and although not shown, it is possible to
arrange at the end along the long side of the rectangular protection plate 35 or to arrange at the
corner, and one or more You may divide and arrange. Moreover, the piezoelectric vibration
element 37 is not limited to the rectangular shape described above, and can be implemented in a
disk shape or any other shape. In the display device with a sound generation function according
to the present invention, not only the liquid crystal display device 3 but also a plasma display
device can be used, which is a plate-like display device having a window-like display surface It is
possible to achieve the object of the present invention as long as it is a plate-like display element
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having a window-like display surface for displaying the operation of and being disposed with the
display surface facing outside in the case 1. Moreover, the piezoelectric vibrating element is
located between the display surface of the liquid crystal display element 3 and the protective
plate 35, between the display surface of the liquid crystal display element 3 and the piezoelectric
vibrating elements 37 and 47 of the protective plate 35, and further on the protective plate 35.
The object of the present invention can be achieved by providing a slight gap between the
regions 37 and 47 and the case 1 so as not to suppress vibration by pressure contact.
Further, the display device with a sound generation function of the present invention is not
limited to a portable telephone, but can be mounted as a monitor display device with a speaker
function in a portable video camera, and is widely mounted in electronic devices that handle
images and sounds. Can be applied. As described above, according to the present invention, the
plate-like display element is disposed inside the electronic device with the window-like display
surface for displaying the operation of the electronic device facing outward. The cover is covered
with a transparent protective plate so that the display surface can be seen from above, and the
piezoelectric vibrating element is attached to the end of this protective plate to vibrate the
protective plate. It is possible to increase the size of a plate-like display element such as a liquid
crystal display element without making it possible to obtain good sounding frequency
characteristics securing a low tone range, to maintain a high sounding level, and to simplify
assembly. Moreover, in the structure which covers the said piezoelectric vibrating element by the
case of the electronic device piled up at the end of the said protective plate, appearance is also
favorable. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an
electronic device (mobile phone) equipped with a display device with a sound generation
function according to the present invention. FIG. 2 is a cross-sectional view (a cross section taken
along line II-II in FIG. 1) showing the display device with a sound generation function of FIG. 1; 3
is a perspective view showing a state in which a piezoelectric vibration element is attached to the
protective plate of FIG. 1; 4 is a cross-sectional view (a cross section taken along line IV-IV in FIG.
3) showing an example of the piezoelectric vibration element of FIG. 1; FIG. 5 is a cross-sectional
view showing another example of the piezoelectric vibration element. FIG. 6 is a plan view of
relevant parts showing another embodiment of the display device with a sound emitting function
according to the present invention. FIG. 7 is a perspective view showing a mobile phone as a
conventional electronic device. 8 is a cross-sectional view showing a receiver used for the mobile
phone shown in FIG. 7; [Description of the code] 1 Case 3 Liquid crystal display device 5 Key 7
Receiver 9 Carrier 11 Antenna 13 Connector 15 Sound through hole 17, 39 Piezoelectric plate
19, 45 Conductive diaphragm 21, 37, 47 Piezoelectric vibrator 23 Holder Reference Signs List
25 lid 27 flange 29 window 31 circuit board 33 spacer 35 protective plate 41, 43 electrode
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