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DESCRIPTION JP2008079179

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DESCRIPTION JP2008079179
The present invention provides a flat image display module which is small in size and thin and
which can listen to clear sound while observing a display of good quality despite the provision of
a speaker device. A sound source unit 3 is disposed in a bottom plate recess 411 in an exterior
case 4, and a backlight unit 2 and a liquid crystal display unit 1 are sequentially fitted and stored
thereon. In the sound source unit 3, the disk-shaped piezoelectric ceramic plate 31 emitting a
sound wave is open at the periphery of the rear surface facing the outer case bottom plate 41
over the entire front edge facing the light reflection sheet 25. A non-annular spacer 34 having a
portion 341 is interposed between the backlight unit 2 and the exterior case bottom plate 42.
The opening 341 of the non-circular spacer 34 is in communication with the sound guiding path
5. [Selected figure] Figure 2
Flat image display module
[0001]
The present invention relates to a flat image display module including a speaker device.
[0002]
2. Description of the Related Art In recent years, flat-type image display panels (hereinafter
referred to as FPDs (Flat Panel Displays)) suitable for reducing the size and thickness of liquid
crystal display panels and organic EL displays have been widely used as displays for mobile
devices such as mobile phones.
[0003]
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1
On the other hand, mobile phones are evolving from simple telephones to multi-function devices
with functions such as televisions and PDAs (Personal Data Assistants), and displays used for
such mobile devices include not only simply displaying video There is also a need for a speaker
device that emits audio.
[0004]
As an example of an FPD of a mobile device provided with a speaker device, an on-vehicle liquid
crystal display panel as shown in Patent Document 1 is known.
JP-A-62-231847
[0005]
In the on-vehicle liquid crystal display panel described above, the video display and the speaker
device are juxtaposed on the front of the device.
When the speaker device is thus juxtaposed on the image display on the front of the device, the
area of the entire device becomes large, which goes against the demand for downsizing, and both
thinning and downsizing as in a mobile phone are required Not suitable as a display for mobile
devices.
[0006]
Therefore, a display module has been proposed in which the speaker device is installed on the
back of the video display to avoid an increase in the overall area, but in this case, display defects
are easily generated because the back of the display is vibrated. In addition, there is a problem
that clear sound can not be provided to the viewer of the display located on the front side (front
side of the display module) of the display because the sound wave is emitted to the back side of
the display module.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a flat type image
display module which can listen to clear sound while observing a display of small size and thin
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and good quality despite having a speaker device.
[0008]
The flat image display module of the present invention is provided on the flat image display
panel and the back side of the flat image display panel opposite to the viewing side of the display,
and both sides of the piezoelectric film vibrate according to the applied voltage. A piezoelectric
sound source element in which a pair of electrodes are electrically connected to each other, a
sound guide path for guiding a sound wave oscillated from the piezoelectric sound source
element to an observation side of display, the image display panel and the piezoelectric sound
source element , A first spacer interposed between the back surface of the image display panel
and the entire periphery of the surface of the piezoelectric film facing the back surface, and
forming a closed space, and the piezoelectric film And a second spacer including a notch portion
interposed between the rear surface peripheral edge and the case and communicating the space
formed with the enclosure with the sound guide path.
[0009]
According to the flat type image display module of the present invention, the back of the
piezoelectric film in the piezoelectric sound source element installed on the back of the image
display panel, the back of the sound waves oscillated on both sides The sound wave oscillated in
the) is selectively guided to the front side of the module through the sound conduction path, so
that the light reflection sheet etc. on the back of the image display panel is vibrated by the sound
wave and the display defect is not generated. The sound wave is efficiently guided to the front
side of the module, and clear speech can be heard while observing the display.
[0010]
FIG. 1 is a perspective view showing a liquid crystal display module as one embodiment of the
present invention, FIG. 2 is a sectional view taken along the line II-II, and FIG. 3 is an exploded
perspective view thereof.
[0011]
As shown in FIG. 3, the liquid crystal display module of the present embodiment is generally
configured of a liquid crystal display unit 1, a backlight unit 2, a sound source unit 3, and an
exterior case 4.
[0012]
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In the liquid crystal display unit 1, the liquid crystal display panel 12 is housed in a panel case
11, and the liquid crystal display panel 12 forms a pair of rectangles in which electrodes (not
shown) are respectively formed as shown in FIG. The glass substrates 121 and 122 are joined
with the respective electrode formation surfaces facing each other with a frame-like sealing
material (not shown) while maintaining a predetermined gap, and liquid crystal is interposed
between the glass substrates 121 and 122 surrounded by the frame-like sealing materials (Not
shown) is enclosed and comprised.
The panel case 11 is provided with a window 111 for observing the display.
The liquid crystal display panel 12 is conductively joined to a flexible wiring board 13 for
supplying a control signal voltage for driving the liquid crystal from an external drive control
circuit board (not shown).
[0013]
A back light unit 2 is installed on the back side opposite to the viewing side of the display of the
liquid crystal display unit 1.
The backlight unit 2 includes a light guide plate 21 formed of a substantially transparent
rectangular plate, and LEDs (Light-Emitting Diodes) 22 as point light source elements disposed
opposite to one end face (light incident end face) of the light guide plate 21. , A circuit board 23
on which a feed wiring circuit for the LED 22 is formed, an optical sheet laminate 24 laminated
on a light emitting surface of the light guide plate 21 (front surface facing the liquid crystal
display panel 12), and a rear surface of the light guide plate 21 The light reflecting sheet 25 and
the like are formed.
In the present embodiment, the three LEDs 22 are uniformly disposed to face the light incident
end face of the light guide plate 21, and the three LEDs 22 are directly mounted on the circuit
board 23.
Further, in the optical sheet laminate 24, as shown in FIG. 2, two prism sheets 241 and 242 for
aligning the light emission direction and a light diffusion sheet 243 are sequentially laminated
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and arranged on the light emission surface of the light guide plate 21. Become.
[0014]
A sound source unit 3 is installed on the back side of the backlight unit 2.
The sound source unit 3 includes a disk-shaped piezoelectric ceramic plate 31, a pair of strip-like
thin film electrodes 32a and 32b conductively attached to both surfaces thereof, and a
piezoelectric ceramic plate 31 and a backlight unit 2 interposed therebetween. 1, an annular
spacer 33 as a spacer, a broken annular spacer 34 as a second spacer interposed between the
piezoelectric ceramic plate 31 and the outer case 4, and the piezoelectric ceramic plate 31 via
thin film electrodes 32a and 32b. It consists of a flexible wiring board 35 for sound source signal
input in which a wiring for applying a sound source signal voltage is formed.
[0015]
Here, the annular spacer 33 and the non-annular spacer 34 are each formed of an elastic
material such as urethane foam, and elastically hold the peripheral portion of the piezoelectric
ceramic plate 31, and the following first to fourth It is interposed to obtain the effect of 3.
[0016]
The first effect is an effect as a spacer for sufficiently securing a gap larger than the amplitude
when the piezoelectric ceramic plate 31 vibrates.
[0017]
The second effect is an effect as a cushion for not transmitting the vibration of the piezoelectric
ceramic plate 31 to other members.
In particular, in the case of the liquid crystal display module as in the present embodiment, the
occurrence of display defects due to vibration transmitted to the liquid crystal display panel 12 is
prevented.
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[0018]
The third effect is an effect as a separator that separates the sound waves oscillated from both
sides by the vibration of the piezoelectric ceramic plate 31.
In this case, the spacer 33 disposed on the front surface of the piezoelectric ceramic plate 31 (the
surface facing the light reflecting sheet 25 of the backlight unit) is formed in an annular shape in
order to confine sound waves generated from the front surface of the piezoelectric ceramic plate
31. The front is surrounded all around.
On the other hand, the notched ring spacer 34 installed on the back surface of the piezoelectric
ceramic plate 31 is formed into a notched ring shape in which a part of the ring ring is cut away
to provide the opening 341, and the sound wave oscillated from the back surface The opening
341 is positioned in the direction in which the light should be propagated. That is, the opening
341 of the missing ring spacer 34 causes the space formed between the piezoelectric ceramic
plate 31 and the case bottom 41 by the missing ring spacer 34 to communicate with the sound
conduction path described later. Thereby, the sound wave oscillated from the rear surface of the
piezoelectric ceramic plate 31 is propagated from the opening 311 to the sound conduction path,
and clear sound can be obtained on the front side where the display is observed.
[0019]
Then, the front surface of the piezoelectric ceramic plate 31 is surrounded by the annular spacer
33 to form a closed space, and a sound wave oscillated from the front surface of the piezoelectric
ceramic plate 31 is sealed. The resonance phenomenon due to the sound wave oscillated from
the front surface of the light reflecting sheet 25 opposed to the front surface 31 is suppressed,
and as a result, the occurrence of the display defect of the image in the liquid crystal display unit
1 is avoided.
[0020]
Further, as described above, the acoustic wave is confined by the annular spacer 33 to suppress
the resonance of the light reflecting sheet 25, thereby preventing the charging caused by the
resonance of the light reflecting sheet 25 and charging the light reflecting sheet 25. Abnormal
vibration of the piezoelectric ceramic plate 31 due to the charge does not occur.
[0021]
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The flexible wiring board 35 for inputting sound source signals uses an insulating resin film such
as a polyimide film as a base film 351, and two wires 352 and 353 are formed on one surface of
the base film 351 by patterning copper foil by photolithography. ing.
Connection terminals 352a and 352b and connection terminals 353a and 353b are formed at
both ends of the wires 352 and 353, respectively.
The other end portions of a pair of thin film electrodes 32 a and 32 b whose one end portions
are respectively conductively attached to both surfaces of the piezoelectric ceramic plate 31 are
soldered to one of the connection terminals 352 a and 353 a of these wires 352 and 353. Ru.
The flexible wiring board 35 for inputting sound source signals is disposed on the back side in a
configuration in which the wiring formation surface is opposed to the backlight unit 2.
[0022]
The liquid crystal display unit 1, the backlight unit 2, and the sound source unit 3 described
above are accommodated in an exterior case 4. The exterior case 4 of the present embodiment is
formed by processing a sheet metal material, and is generally formed in an open-topped
rectangular box shape having a flat outer shape in which the liquid crystal display unit 1 and the
backlight unit 2 can be fitted and stored. . At the central portion of the bottom plate 41 of the
outer case 4, a rectangular recess 411 extending over the entire length in the longitudinal
direction is formed. The sound source unit 3 is housed and mounted in the recess 411.
[0023]
Then, among the four side plates of the exterior case 4, the side plate 42 to which the opening
portion 341 of the non-circular spacer 34 in the sound source unit 3 mounted in the concave
portion 411 faces is formed a sound introducing path A convex portion 421 for the purpose is
formed. The convex portion 421 is provided corresponding to one end of the concave portion
411 of the bottom plate 41. Therefore, the space between the concave portion 411 and the
convex portion 421 is in communication.
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[0024]
Note that two openings 431 and 432 are respectively formed in a predetermined length in one
side plate 43 of the pair of longitudinal side plates. The openings 431 and 432 are openings for
drawing out the flexible wiring board 13 joined to the liquid crystal display panel 11 and the
flexible wiring board 35 for sound source signal input of the sound source unit 3 out of the
exterior case 4.
[0025]
As shown in FIG. 2, the sound source unit 3 is attached to the exterior case 4 formed as described
above. In this case, the rear surface of the base film 351 of the flexible wiring board 35 for sound
source signal input where the wires 352 and 353 are not formed is mounted in contact with the
bottom plate 41 of the exterior case 4. As a result, the connection terminals 352a, 353a, etc. of
the wires 352, 353 which are not coated with the insulating coating film (not shown) are shorted
with the exterior case 4 formed of a conductive sheet metal and a signal becomes a sound source.
Leakage of voltage to the outer case 4 is prevented.
[0026]
The back light unit 2 and the liquid crystal display unit 1 are sequentially fitted in and stored on
the exterior case 4 to which the sound source unit 2 is attached. In this state, the sound
conduction path 5 is formed so as to be surrounded by the convex portion 421 of the side plate
42 and the corresponding end face of the back light unit 2 and the liquid crystal display unit 1
accommodated. The sound guiding path 5 guides a useful sound wave emitted from the rear
surface by the vibration of the piezoelectric ceramic plate 31 from the opening 341 of the
annular gap spacer 34 to the front surface (module front surface) side of the liquid crystal
display panel 11 Provided in Accordingly, the sound wave oscillated from the rear surface by the
piezoelectric ceramic plate 31 vibrating according to the input signal voltage travels from the
opening 341 of the annular spacer 34 into the sound conduction path 5, and this sound
conduction path 5 While propagating inside, the sound pressure (sound volume) is amplified to
some extent and emitted to the display surface (front surface) side of the liquid crystal display
panel 11. As a result, the viewer of the present liquid crystal display module can observe the
video displayed on the liquid crystal display panel 11 and can also listen to clear audio related
thereto.
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[0027]
As described above, in the liquid crystal display module according to the present embodiment,
the sound source unit 3 is placed on the back (rear) side of the liquid crystal display unit 1 and
the sound wave emitted from the sound source unit 3 is on the front side of the liquid crystal
display unit 1 Since the sound guide path 5 leading to the is formed on the side surface of the
module, the increase in the area of the entire liquid crystal display module due to the provision of
the speaker device can be suppressed as small as possible. As a result, it is possible to reduce the
size and thickness of an applied product, such as a mobile phone, on which the liquid crystal
display module with a speaker device is mounted.
[0028]
Then, an annular spacer 33 is interposed between the entire peripheral edge of the front surface
of the piezoelectric ceramic plate 31 and the light reflecting sheet 25 of the backlight unit 2
opposed thereto, thereby forming a closed space, thereby forming the piezoelectric ceramic plate
31. Since the sound wave emitted from the front surface of the light reflection sheet 25 is
confined, the resonance of the light reflection sheet 25 due to the sound wave is suppressed, and
as a result, the occurrence of display defects of the liquid crystal display panel 1 is avoided. Noise
is prevented from mixing into the voice due to the charging of the
[0029]
In addition, an annular spacer 34 having an opening 341 is interposed between the peripheral
edge of the rear surface of the piezoelectric ceramic plate 31 and the bottom surface 41 of the
outer case facing the same, and emitted from both the front and rear surfaces of the piezoelectric
ceramic plate 31 Since the sound wave is separated, and only the useful sound wave emitted
from the rear surface on which the annular spacer 34 is installed is selectively emitted from the
spacer opening 341 to the front side of the module through the sound guide path 5, It is possible
to listen to a clear sound without noise while observing a display of high quality on the front side
of the display module.
[0030]
Furthermore, since the rear surface opposite to the wiring formation surface of the flexible
wiring board 35 for inputting sound source signals is directed to the exterior case 4, wiring
exposed portions such as the connection terminals 352a and 353a of the wirings 352 and 353
are The occurrence of the problem of leakage to the outer case 4 formed of a conductive sheet
metal is prevented, and the reliability as the display module is improved.
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[0031]
In addition, since the sound guiding path 5 is formed by surrounding the outer case side plate 42
and the side end faces of the liquid crystal display unit 1 and the backlight unit 2 without using a
dedicated member, an increase in the number of parts is suppressed and Since the sound source
unit 3 is integrated with the liquid crystal display unit 1 and the backlight unit 2 and one exterior
case 4, the component layout design in the device on which the present liquid crystal display
module is mounted becomes extremely easy. The mounting and assembling operation is also
simplified and contributes to the reduction of the number of manufacturing steps.
[0032]
Next, a modification of the above embodiment will be described based on FIG. 4 and FIG.
In addition, about the component same as the said embodiment, the same code | symbol is
attached | subjected and the description is abbreviate | omitted.
[0033]
The liquid crystal display module of the present embodiment is a stereo sound system liquid
crystal display module provided with a pair of sound source units 3 and 6, as shown in FIG.
That is, in addition to the sound source unit 3 provided in the liquid crystal display module of the
above embodiment, the center of the sound source unit 6 having substantially the same
configuration bisects the longitudinal direction (screen left and right direction) of the display
surface of the liquid crystal display module. They are arranged symmetrically with respect to the
line.
[0034]
In this case, the piezoelectric ceramic plate 61 to which the pair of electrodes 62a and 62b of the
same configuration are conductively attached corresponding to the piezoelectric ceramic plate
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31 to which the pair of electrodes 32a and 32b are conductively attached corresponds to the
annular spacer 33 and the notch. An annular spacer 63 and a partially annular spacer 64 having
the same configuration are disposed in line symmetry with respect to the center line
corresponding to the annular spacer 34.
However, as for the flexible wiring boards for sound source signal input, not one separate flexible
wiring board is installed but one common flexible wiring board 65 is installed.
[0035]
Along with this, in the outer case 7, convex portions 721 and 721 for forming a sound
conduction path are respectively formed in left and right symmetry in the pair of short side
plates 72 and 72, and the longitudinal side plate 73 is the same as the above embodiment. The
openings 731 and 732 for drawing out the flexible wiring board 13 for control signal input to
the liquid crystal display unit 1 and the flexible wiring board 65 for sound source signal input to
the outside of the case 7 are provided one by one.
As a result, as shown in FIG. 5, it is possible to obtain a stereo sound system speaker deviceequipped liquid crystal display module having a pair of sound guiding paths 8 and 9 on the left
and right of the module display surface.
[0036]
According to the flat type liquid crystal display module of the present modification configured as
described above, a speaker device capable of listening to clear noise with little noise, a display
capable of observing a high quality display image, and a small and thin applied product In
addition to the effect similar to the above-mentioned embodiment that it can be realized, the
special effect that the sound can be clearly heard in the stereo system is exhibited.
[0037]
The present invention is not limited to the above embodiment.
In the said embodiment, although exterior case 4 and 7 process and form the sheet metal
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material of a conductor, you may shape | mold-process an exterior case not only this but using
insulation resin material. In this case, since the outer case is an insulator, the sound source signal
leaks through the case even if the non-electrode forming surface (rear surface) of the insulating
base film in the flexible wiring board for sound source signal input is not opposed to the case.
There is an advantage that the risk of doing so is eliminated.
[0038]
In addition, the present invention can be widely applied not only to backlit liquid crystal display
modules but also to various other flat panel image display modules such as reflective liquid
crystal display modules or organic EL (Electro Luminescence) displays and plasma displays. Of
course.
[0039]
It is a perspective view which shows the liquid crystal display module as one Embodiment of this
invention.
FIG. 2 is a schematic cross-sectional view of the liquid crystal display module taken along line IIII in FIG. It is a disassembled perspective view of the said liquid crystal display module. It is a
disassembled perspective view which shows the modification of the said liquid crystal display
module. It is a perspective view which shows the modification of the said liquid crystal display
module.
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 1 Liquid crystal display unit 11 Panel case 111 Display window 12
Liquid crystal display panel 121, 122 Glass substrate 13 Flexible wiring substrate 2 Backlight
unit 21 Light guide plate 22 LED 24 Optical sheet laminated body 25 Light reflection sheet 3, 6
Sound source unit 31, 61 Piezoelectric Ceramic plate 32a, 32b 62a, 62b Thin film electrode 33,
63 Annular spacer 34, 64 Annular spacer 35, 65 Flexible wiring board for sound source signal
input 4, 7 Outer case 41 Bottom plate 411 Concave 42 Side plate 421 Convexity 5, 8 Sound
transmission path
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