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DESCRIPTION JP2009189050

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DESCRIPTION JP2009189050
An image display module having a miniaturized and thinned speaker is provided. A liquid crystal
display module includes a liquid crystal display unit 1, a back light unit 2 disposed on the back
side thereof, an exterior case 4 disposed on the back side thereof, and a space between the
backlight unit 2 and the exterior case 4 The sound source unit 3 is configured. A convex portion
421 is formed on the side wall 42 of the outer case 4 and a space surrounded by the
corresponding side surfaces of the backlight unit 2 and the liquid crystal display unit 1 and the
convex portion 421 is emitted from the sound source unit 3 A sound guiding path 5 for guiding
the sound wave to the front side of the module is formed. [Selected figure] Figure 3
Image display module
[0001]
The present invention relates to a flat image display module having 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]
On the other hand, mobile phones are progressing from simple phones to multi-function devices
with functions such as TVs and PDAs (Personal Data Assistants), and displays used for such
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mobile devices not only display video but also It is required to have a speaker function that emits
sound.
[0004]
As an example of FDP of a mobile device provided with a speaker, an on-vehicle liquid crystal
display panel as shown in Patent Document 1 is known.
[0005]
JP-A-62-231847
[0006]
In the above-described on-vehicle liquid crystal display panel, the video display and the speaker
are provided in parallel on the front of the device.
When the speakers are juxtaposed on the image display on the front of the device in this manner,
the area of the entire device becomes large, which goes against the demand for miniaturization,
and mobiles that are both required to be thin and compact like mobile phones Not suitable as a
display for equipment.
[0007]
An object of the present invention is to provide an image display module with a speaker which is
miniaturized and thinned.
[0008]
The image display module according to the first aspect of the present invention comprises a flat
image display panel, a sound source element disposed on the back side opposite to the
observation side of the display of the image display panel, and the light source element And a
sound guide path for guiding the sound wave to the observation side of the display.
[0009]
The liquid crystal display module according to the second aspect of the present invention
comprises a flat image display panel, and two sound source elements disposed on the back side
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opposite to the display observation side of the image display panel. It is characterized by having
two sound paths which guide two sound waves emitted from two sound source elements to the
observation side of the display.
[0010]
According to the image display module according to the first aspect of the present invention, the
sound source element is disposed on the back side of the image display panel, and a sound guide
path is provided to guide the sound wave generated by the sound source element to the display
side. Therefore, the area of the entire device can be reduced and thinned, and the device can be
applied to devices such as mobile phones.
[0011]
Further, according to the image display module according to the second aspect of the present
invention, two sound source elements are disposed on the back side of the image display panel,
and two sound waves different from each other generated from the two sound waves generated
by these two sound source elements Since the path leads to the front of the image display panel
to emit sound, stereophonic sound effects can be obtained using these two sound source
elements.
[0012]
It is a perspective view which shows the liquid crystal display module as 1st 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 liquid crystal display module as 2nd
Embodiment of this invention.
It is a perspective view which shows the liquid crystal display module as said 2nd Embodiment.
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It is a disassembled perspective view which shows the modification of a sound source element.
[0013]
First Embodiment FIG. 1 is a perspective view showing a liquid crystal display module according
to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II, and
FIG. 3 is an exploded perspective view thereof.
[0014]
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.
[0015]
The liquid crystal display unit 1 includes a panel case 11 and a liquid crystal display panel 12
housed in the panel case 11.
As shown in FIG. 2, the liquid crystal display panel 12 is a frame-shaped sealing material (not
shown) in which a pair of rectangular glass substrates 121 and 122 on which electrodes (not
shown) are respectively formed are opposed to each other. Thus, they are joined with a
predetermined gap maintained, and a liquid crystal (not shown) is sealed between the glass
substrates 121 and 122 surrounded by the frame-like sealing material.
The panel case 11 is provided with a window 111 for observing the display.
The liquid crystal display panel 12 is electrically connected to a flexible wiring board 13 for
supplying a control signal voltage for driving liquid crystal from an external drive control circuit.
[0016]
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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
and arranged on the light emission surface of the light guide plate 21. Become.
[0017]
On the back side of the backlight unit 2, a sound source unit 3 as a sound source element is
installed. The sound source unit 3 includes a piezoelectric vibrating element constituting a
vibrating element, and more specifically, a disk-shaped piezoelectric ceramic plate 31 and a pair
of strip-like thin film electrodes 32a and 32b conductively attached to both surfaces thereof. A
“C” -shaped first spacer 33 (hereinafter referred to as “C-shaped spacer”) having a notch
formed between the ceramic plate 31 and the backlight unit 2, and interposed between the
piezoelectric ceramic plate 31 and the exterior case 4 A flexible wiring for sound source signal
input, in which a second circular spacer 34 (hereinafter referred to as a circular spacer) and a
wiring for applying a sound source signal voltage to the piezoelectric ceramic plate 31 through
the thin film electrodes 32a and 32b are formed. It consists of a substrate 35.
[0018]
Here, the C-shaped spacer 33 and the circular spacer 34 are each formed of a buffer material
such as urethane foam, and elastically hold the peripheral portion of the sound source element,
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and the following first to third effects are obtained. It is intervened to gain.
[0019]
First, it functions as a spacer for sufficiently securing and supporting a gap larger than the
amplitude when the piezoelectric ceramic plate 31 vibrates, and produces an effect of freely
vibrating the piezoelectric ceramic plate 31 with a large amplitude. .
Therefore, each of the spacers 33 and 34 is formed in a size that can support the peripheral
portion of the piezoelectric ceramic plate 31.
[0020]
Second, it acts as a shock absorbing material for preventing the vibration of the piezoelectric
ceramic plate 31 from being transmitted to other members. In particular, in the case of the liquid
crystal display module as in the present embodiment, the vibration is transmitted to the liquid
crystal display panel 12 and an effect of preventing a display defect from occurring is exhibited.
[0021]
Thirdly, the piezoelectric ceramic plate 31 vibrates to prevent interference between sound waves
generated from both sides thereof, and acts as a partition for forming a sound conduction path.
That is, the circular spacer 34 installed on the rear surface of the piezoelectric ceramic plate 31
(opposite surface to the outer case 4) is formed in a closed circular shape surrounding the entire
rear surface of the piezoelectric ceramic plate 31. It prevents the sound wave generated from the
rear surface from propagating to the front side (the side opposite to the backlight unit 2), and
emits it to the rear side. The C-shaped spacer 33 installed on the front surface of the piezoelectric
ceramic plate 31 is installed with its opening 331 directed in the direction to propagate the
sound wave generated from the front surface of the piezoelectric ceramic plate 31. The opening
331 of the C-shaped spacer 33 is in communication with the sound conduction path formed by
the space formed between the image display panel and the exterior case 4 as described later.
Sound waves generated from the front surface are emitted from the opening 311 to the sound
conduction path without interference with sound waves generated from the rear surface, and
clear sound can be obtained.
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[0022]
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. Then, the flexible wiring board 35 for inputting sound source
signals is disposed on the back side with the wiring formation surface facing the backlight unit 2.
[0023]
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 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. At one end of the recess 411,
in the present embodiment, five pores 412 are formed in a cross arrangement. These pores 412
are bored in the area facing the piezoelectric ceramic plate 31 of the sound source unit 3 to be
mounted, and in order to quickly dissipate unnecessary sound waves emitted from the rear
surface of the piezoelectric ceramic plate 31 outside the outer case 4 Provided in As a result,
unnecessary sound waves can escape to the space outside the exterior case 4 (the excess space
of the module installation space in the application device), be absorbed, and be attenuated. As a
result, the sound emitted from the sound source unit 3 becomes clearer.
[0024]
Then, on one of the side walls 42 of the four side walls of the exterior case 4 which are
orthogonal to the extending direction of the concave portion 411, a convex portion 421 for
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forming a sound guiding path projecting from the side surface of the image display panel The
convex portion 421 is formed of a projecting wall forming an elongated rectangular space
extending along the side surface of the image display panel. The convex portion 421 is provided
corresponding to one end of the concave portion 411 of the bottom plate 41. The sound source
unit 3 is attached to the end of the concave portion 411 corresponding to the side wall convex
portion 421, and the opening 331 of the C-shaped spacer 33 opens toward the convex portion
421 of the side wall 42.
[0025]
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.
[0026]
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 surface of the base film 351 of the flexible wiring board 35 for inputting
sound source signals on which the wires 352 and 353 are not formed is disposed toward the
bottom plate 41 of the exterior case 4. As a result, the connection terminals 352a, 353a, etc.
which are not insulated among the wires 352, 353 leak to the outer case 4 formed of a
conductive sheet metal, and a short between the connection terminals 352a, 353a occurs. , To
prevent.
[0027]
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 is provided to guide the sound wave emitted from the
front surface of the piezoelectric ceramic plate 31 from the opening portion 331 of the spacer 33
to the front surface (display surface) side of the liquid crystal display panel 11. Therefore, the
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sound wave emitted from the front surface of the piezoelectric ceramic plate 31 as it vibrates
according to the input signal voltage travels from the opening 331 of the spacer 33 into the
sound conduction path 5 and propagates in the sound conduction path 5. Thus, the light is
emitted to the display surface (front 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.
[0028]
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 of the module,
the increase in the area of the entire liquid crystal display module resulting from the provision of
the sound generation means, that is, the speaker can be suppressed to a small level. As a result,
the speaker-equipped liquid crystal display module can be made small and thin enough to be
applicable to, for example, a portable telephone.
[0029]
Further, in the sound source unit 3, C-shaped spacers 33 and circular spacers 34 formed of a
shock absorbing material are respectively installed on both sides of the piezoelectric ceramic
plate 31, and C-shaped spacers among the sound waves emitted from both sides of the
piezoelectric ceramic plate 31. Since the sound wave emitted from the surface on which 33 is
installed is selectively emitted from the spacer opening 331 to the front side of the module
through the sound guide path 5, clear sound can be obtained.
[0030]
Furthermore, a pore 412 is bored in the outer case 4 so that unnecessary sound waves emitted
from the surface of the piezoelectric ceramic plate 31 on which the circular spacer 34 is installed
escape from the pore 412 to the space outside the module and are absorbed and extinguished.
Therefore, clearer voice can be obtained.
[0031]
Furthermore, since the surface on the opposite side 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 of the connection terminals 352a, 353a, etc. Leaks to the outer case 4 formed
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of a conductive sheet metal and prevents shorting between the connection terminals 352a and
353a, thereby improving the reliability as a display module.
[0032]
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 to contribute to the reduction of the number of manufacturing steps, and as a result,
the cost reduction of the flat liquid crystal display module of the present embodiment is
remarkably promoted.
[0033]
Second Embodiment Next, a second embodiment of the present invention 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.
[0034]
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.
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[0035]
In this case, the piezoelectric ceramic plate 61 in which the pair of electrodes 62a and 62b of the
same configuration are conductively bonded corresponding to the piezoelectric ceramic plate 31
to which the pair of electrodes 32a and 32b are conductively bonded is a C-shaped spacer 33,
circular. C-shaped spacers 63 and circular spacers 64 having the same configuration are
disposed in line symmetry to the center line, corresponding to the spacers 34.
The pair of electrodes 32a and 32b and the pair of electrodes 62a and 62b of the piezoelectric
ceramic plates 31 and 61 are connected to the conductive pattern of the common flexible wiring
board 65 on which conductive patterns corresponding to the respective electrodes are formed.
[0036]
In the outer case 7, the escape holes of the unnecessary sound wave in which the fine holes 712
are cross-arranged in the concave portion 711 of the bottom plate 71 are respectively drilled at
symmetrical positions, and the sound conduction paths are formed in the pair of short side plates
72, 72. In the same manner as in the above embodiment, 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 are formed on the longitudinal side plate 73. The respective openings 731 and 732
for drawing out the case 7 out 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 attached
liquid crystal display module having a pair of sound guiding paths 8 and 9 on the left and right
of the module display surface.
[0037]
According to the flat-type liquid crystal display module of the present modification configured as
described above, the above-described embodiment can achieve downsizing and thinning of a
device provided with a speaker with excellent reliability and clear audio. In addition to the same
effect, there is an effect that the sound can be clearly heard in stereo.
[0038]
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The present invention is not limited to the above embodiment.
In the above embodiment, as the sound source units 3 and 6, the disk-shaped piezoelectric
ceramic plates 31 and 61 and the pair of strip-like thin film electrodes 32a, 32b, 62a and 62b
conductively attached to both surfaces are used. Although the example which used the sound
source element was shown, you may use not only this but the sound source element 10 which
consists of a piezoelectric vibrator which stuck the piezoelectric element on at least one surface
of the film used as a diaphragm. That is, as shown in FIG. 6, a piezoelectric vibrator in which a
piezoelectric element 101 having a diameter smaller than that of the diaphragm 102 is attached
to one or both of the circular diaphragm 102 made of resin or metal. Then, a C-shaped spacer
103 and a circular spacer 104 are disposed outside the outer shape of the piezoelectric element
101 of the diaphragm 102 to fix the sound source element 10 to the cases 4 and 7. According to
this configuration, it is possible to obtain vibration with a large amplitude due to the diaphragm,
and to generate sound with stronger sound pressure.
[0039]
Further, in the above embodiment, the sound conduction path is communicated with the sound
source path to the spacer disposed between the sound source element and the image display
panel out of the spacer disposed between the sound source element and the backlight unit and
the sound source element and the case. However, the present invention is not limited to this, and
the spacer disposed between the sound source element and the case may be provided with a
notch for communicating with the sound conduction path, or The notches may be provided in
both the sound source element and the backlight unit, and the spacers respectively disposed
between the sound source element and the case. In this case, it is preferable to further provide a
space for inverting the phase of the sound wave between the sound source element and the case.
[0040]
Furthermore, in the above-described embodiment, although the outer cases 4 and 7 are formed
by processing a sheet metal material of a conductor, the present invention is not limited to this,
and the outer case may be molded using an insulating resin material. In this case, since the
external case is an insulator, no short circuit occurs between the terminals of the flexible wiring
board for sound source signal input, so the electrode forming surface of the insulating base film
in the flexible wiring board is disposed facing the case It is possible to obtain the advantage that
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the degree of freedom in design and arrangement of the flexible wiring board is increased.
[0041]
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.
[0042]
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, 103 C-shaped spacer 34, 64, 104 Circular spacer 35, 65 Flexible wiring board for sound
source signal input 4, 7 Outer case 41 Bottom plate 411 Concave portion 412 Pore 42 Side plate
421 Convex part 5, 8 Sound conduction path 10 Sound source element 101 Piezoelectric
element 102 Diaphragm
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