JP2008243581

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DESCRIPTION JP2008243581
The present invention provides an acoustic lighting device that is versatile and does not impair
the appearance of the whole when used for a shelf or the like. An acoustic illumination device (1)
according to the present invention has a first flat electrode (10, 10A, 10) having a light guide
layer (13, 15) and a light diffusion layer (12, 16) and a through hole formed therein. 10B), a
second flat electrode (20) spaced apart from the first flat electrode, and a gap between the first
flat electrode and the second flat electrode, which can be displaced by electrostatic force A
vibration film (30) and a light source (50) for injecting light into the light guide layer, for
transmitting an acoustic wave to at least one of the first flat electrode and the second flat
electrode Through holes (h1, h2) are provided at predetermined intervals, and the light source
injects the light from the end face (T) of the first flat electrode. [Selected figure] Figure 1
Acoustic lighting device and information providing device
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an
integrated device of sound and lighting having a sound generation function and a lighting
function.
[0002]
A shelf, a case, etc. (hereinafter referred to as a shelf etc.) used when displaying and displaying
goods and works of art, etc. is provided with a lighting device for illuminating the goods etc. or
visually appealing to the user, A device has been devised which is provided with a speaker for
providing the user with information concerning the user by voice (see Patent Documents 1 and
2).
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[0003]
JP, 8-160897, A Utility model registration 3 109 565
[0004]
The devices described in these documents generally have one acoustic function and lighting
function (hereinafter referred to as acoustic lighting function) by attaching or incorporating a
speaker and lighting equipment (light) that can function independently to a shelf etc. A shelf etc.
provided with the
When manufacturing a speaker, a light, a shelf, etc. integrally, illumination and sound can be set
in a suitable aspect according to a display etc.
Specifically, depending on the shape and size of the display object or the purpose of the display,
the position and brightness of illumination, the direction of the acoustic wave, and the sound
pressure level are set.
However, shelves designed in this way lack versatility. That is, if the size of the display, the
purpose of the display, the display environment, etc. change, there is a possibility that the use of
the display is no longer suitable. Also, if lighting and sound are individually designed according
to the exhibits, the manufacturing cost will inevitably be high. On the other hand, if a shelf
suitable for the exhibits etc. is prepared and a speaker or a light is attached to this shelf, it can be
said that a certain versatility is realized, but the shelf etc. may be enlarged, and further, The
appearance of the shelf as a whole may be impaired. In addition, it takes time and effort to adjust
the mounting positions and directions of the lights and speakers each time.
[0005]
The present invention has been made in view of the above-described background, and relates
generally to a device having an acoustic lighting function, and more particularly to an acoustic
lighting device that is versatile and does not impair the overall aesthetic appearance when used
for a shelf or the like.
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[0006]
In order to solve the above problems, according to one aspect of the present invention, there is
provided a first flat electrode having a light guide layer and a light diffusion layer, and a second
flat electrode spaced apart from the first flat electrode. An acoustic wave is provided to at least
one of the first flat electrode and the second flat electrode, including a vibrating film provided
between the first flat electrode and the second flat electrode and displaceable by electrostatic
force. There is provided an acoustic lighting device characterized in that a through hole for
transmission is provided.
[0007]
In a preferred embodiment, the light guide layer further comprises a light source for injecting
light into the light guide layer.
[0008]
In a preferred embodiment, the vibrating membrane is composed of a plurality of conductive
regions, and further includes a feed unit for supplying a voltage with a predetermined magnitude
and phase to each of the plurality of conductive regions.
[0009]
Another aspect of the present invention is characterized in that the acoustic illumination device,
the detection means for detecting the position of the user, and the change means for changing
the directivity of the acoustic wave according to the position detected by the detection means.
Providing an information providing apparatus
[0010]
The acoustic lighting device of the present invention is versatile and does not impair the overall
aesthetic appearance even when used on a shelf or the like.
[0011]
Example FIG. 1 is an external perspective view of an acoustic lighting unit 1 according to an
example of the present invention.
As shown in the figure, the acoustic lighting unit 1 includes a front surface electrode 10, a back
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surface electrode 20, a diaphragm 30, a support portion 40, a high brightness LED 50, and a
storage portion 60, and has a width W as a whole. It has a depth D and a thickness H.
The front electrode 10 and the back electrode 20 have through holes at regular intervals (for
example, an aperture ratio of 30%).
The front surface electrode 10 and the back surface electrode 20 are fixed to the XY plane in a
state where they are opposed in the Z direction by the support portions 40, respectively.
[0012]
The vibrating membrane 30 is provided at an intermediate position between the front surface
electrode 10 and the back surface electrode 20, and is supported by the support portion 40
under a predetermined tension.
The vibrating film 30 is, for example, a film made of PET (polyethylene terephthalate,
polyethylene terephthalate), PP (polypropylene, polypropylene) or the like by vapor deposition of
a metal film or coating of a conductive paint. It is formed using a plate-like (film-like) material
having a certain degree of conductivity.
Alternatively, it may be one obtained by laminating a metal thin film, or one obtained by applying
a high voltage to the insulating film and polarizing it.
[0013]
The support portions 40 are made of an insulating material and provided at the four corners of
the acoustic lighting unit 1.
[0014]
The high brightness LED 50 is a rectangular parallelepiped light emitting diode that emits light of
a predetermined wavelength.
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The light emitting portion (length d2, thickness d1) of the high brightness LED 50 is in contact
with the end face T of the surface electrode 10, and emits light from this.
The irradiated light enters the interior of the acoustic lighting unit 1. A reflective film or the like
(not shown) is provided on the three end faces of the four end faces of the surface electrode 10
which are not in contact with the high brightness LED 50 so that the intruded light does not leak
from the end faces.
[0015]
The storage unit 60 is a control circuit for controlling the magnitude and phase of voltage
applied to the front surface electrode 10 and the back surface electrode 20, a circuit for
inputting a musical tone signal and a memory for storing musical tone data, and for supplying to
the high brightness LED 50. It is for accommodating a power supply circuit etc. (all are
illustration abbreviation ¦ omission). In addition, screw holes and the like are formed on the outer
surface of the storage portion 60, and can be fixed to a general shelf or the like.
[0016]
FIG. 2 is a cross-sectional view of the acoustic lighting unit 1. The structure of the surface
electrode 10 and the back electrode 20, the acoustic wave generation mechanism, and the light
emission mechanism will be described using this figure. As shown in the figure, the through hole
h1 is formed in the surface electrode 10, but the portion where the through hole h1 is not
formed is constituted of the metal layer 11, the light diffusion layer 12 and the light guide layer
13 Ru. The metal layer 11 is a layer made of a metal (for example, aluminum) having a function
as an electrode. The metal layer 11 may be formed on the light diffusion layer 12 by, for
example, metal deposition or metal adhesion other than the metal film. The light diffusion layer
12 is a layer made of a white paint material or the like and having a property of diffusing
incident light from the light guide layer 13. The light guide layer 13 is a transparent material
such as acrylic having high light permeability or an air layer, and is for guiding the incident light
IL from the high brightness LED 50 to the inside.
[0017]
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The metal layer 11, the light diffusion layer 12, and the light guide layer 13 may be formed by
any method. For example, a white ink may be printed on the surface of acrylic and aluminum
may be deposited thereon. The incident light is guided to the inside by the light guide layer 13,
diffused by the light diffusion layer 12, and scattered to the outside (direction in the figure)
(scattered light L). Since this light scattering occurs on average anywhere in the light diffusion
layer 12, as a result, light is emitted uniformly from the surface of the surface electrode 10 in a
substantially vertical direction. Thus, the acoustic illumination unit 1 emits surface light from the
side of the surface electrode 10.
[0018]
On the other hand, the back surface electrode 20 is an alloy (so-called punching metal; PM) such
as SUS having a planar shape having a through hole h2. Its thickness is, for example, 1 mm. The
back surface electrode 20 may have conductivity by metal deposition or metal bonding on a
nonmetal substrate in addition to a metal plate.
[0019]
A voltage corresponding to a musical tone signal is applied to the diaphragm 30, the front
surface electrode 10, and the back surface electrode 20 through a voltage application unit (not
shown). An electrostatic force corresponding to the signal acts. More specifically, the conductive
film is formed with a plurality of conductive regions. Then, voltages can be applied independently
to each conductive region. A delay circuit and an amplifier circuit for performing predetermined
delay and amplification are provided, whereby voltages can be applied with different magnitudes
and phases for each conductive region. By controlling the delay amount and amplification
amount, the amplitude and phase of each region of the vibrating film 30 are controlled. As a
result, the directivity of the acoustic wave generated in the vibrating film 30 can be controlled.
Acoustic waves generated by the vibration of the vibrating film 30 are radiated to the outside
from the through holes h 1 and h 2 of the front electrode 10 and the back electrode 20.
[0020]
FIG. 3 is a view showing the structure of the vibrating membrane 30. As shown in FIG. As shown
in the figure, the vibrating film 30 has an insulating film substrate 300 and a plurality of strip-
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like conductive regions 301 to 313 on the film substrate 300 in the Y direction (that is, the
direction of the short side of the vibrating film 30). To form. In other words, one vibrating
membrane 30 is substantially divided in parallel to the X-axis, and each of the conductive regions
301 to 313 functions as an independent vibrating membrane. By adopting such a method of
forming the diaphragm 30, the accuracy of directivity control in the Y direction (YZ plane) of the
acoustic wave is improved.
[0021]
Further, in the method of fixing the vibrating membrane 30, it is not necessary to be fixed by
tension as described above. For example, a cushioning material such as insulating non-woven
fabric or cotton is interposed between the front surface electrode 10 and the vibrating
membrane 30 and between the back surface electrode 20 and the vibrating membrane 30
without providing the support portion 40, and The entire surface of the vibrating membrane 30
may be supported by the received elastic force. Also, the vibrating membrane 30 need not be
supported as a whole. For example, a plurality of support members may be provided on the film
substrate 300 to support the vibrating film 30 by separating the conductive regions 301 to 313
so that the conductive regions 301 to 313 are independently supported.
[0022]
As described above, the acoustic illumination unit 1 has both the illumination function of
emitting surface light from the surface of the front surface electrode 10 and the function of an
electrostatic speaker that generates acoustic waves from the front surface electrode 10 and the
back surface electrode 20.
[0023]
FIG. 4 illustrates the arrangement of the through holes h 1 and h 2 of the front surface electrode
10 and the back surface electrode 20.
As shown in the figure, the arrangement intervals of the holes are small (ie, dense) in the X
direction (long side direction of the surface electrode 10) and large (ie, coarse) in the Y direction
(short side direction of the surface electrode 10). . The ratio of the distance in the X direction to
the distance in the Y direction is, for example, the same as the ratio of the front surface electrode
10 (the back surface electrode 20). By adopting such an arrangement, the ratio in which the
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incident light IL entering the light guide layer 13 from the X direction is scattered by the through
holes h1 is reduced, and as a result, the uniformity of light emission (the amount of light
emission becomes a surface electrode Uniformity is improved regardless of the place on 10).
However, the arrangement aspect (the size, the number, and the arrangement method of the
through holes) of the through holes h1 is not limited to those described above, and can be
appropriately set according to the desired light emission characteristics (the light amount, the
irradiation angle, etc.) . Further, as described above, since the through holes h1 also have a
function of emitting an acoustic wave, the arrangement of the through holes h1 also affects the
directivity characteristics of the acoustic wave. Therefore, in determining the arrangement of the
through holes h1, it is preferable to take into consideration the directivity control of the acoustic
wave or the light emission characteristic.
[0024]
FIG. 5 is a view showing the appearance of a display case 100 for displaying goods using the
acoustic lighting unit 1. As shown in the figure, the display case 100 includes a top plate Up, a
back plate Bp, a side plate Sp, and a bottom plate Lp, and the acoustic lighting unit 1 is used as a
shelf for placing a product Ob thereon. As described above, since the acoustic lighting unit 1
emits surface light, the light L is applied from below to the product Ob placed on the acoustic
lighting unit 1 as a shelf. In the case of a dark environment, such a method of illumination can
provide the viewer with a visual effect that makes the product appear. Although an acoustic wave
is emitted also from the back side (the back electrode 20 side), this acoustic wave may adversely
affect the directivity of the acoustic wave emitted from the front side. In this case, for example, a
cavity having a sound absorbing function is preferably provided outside the back electrode 20.
[0025]
FIG. 6 is a side view of the display case 100, showing an example of directions of the acoustic
wave A and the light L emitted from the surface electrode 10. As shown in FIG. As shown in the
figure, in this example, the sound pressure level in the specific direction is set so that an acoustic
beam is formed in the direction of the viewer's line of sight instead of generating a spatially
uniform acoustic wave. The directivity is set to be the highest. Although an acoustic wave is
emitted also from the lower side of an acoustic lighting unit, illustration is omitted.
[0026]
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Thus, in the present embodiment, a flat acoustic illumination unit 1 having a surface emitting
function and a speaker function is provided. The acoustic illumination unit 1 can have a
sufficiently small thickness compared to the width and depth, and the planar surface electrode
10 is suitable for carrying a product or the like. Therefore, ordinary shelf members, partition
plates, and the like can be easily replaced and used for the product display rack, the display case,
and the like. Furthermore, even if it is replaced with the shelf member or the partition plate, the
shape is substantially the same, so there is little risk of impairing the appearance of the entire
case. Moreover, since it has the structure of the electrostatic-type speaker which uses the twodimensional diaphragm 30 as a sound generation mechanism, it can radiate ¦ emit the acoustic
wave which has directivity. The directivity can be controlled, for example, by changing the
magnitude and timing of the voltage applied to each area on the vibrating membrane 30. In
addition, since the product or display on the shelf is exposed to light from below, it is less likely
to cast shadows than when light is applied from the side or from above, providing the essential
light of providing brightness Unique visual effects such as the appearance of goods etc. appear in
addition to various functions.
[0027]
Other Embodiments The light source, the light emitting mechanism, and the structures of the
front surface electrode 10, the back surface electrode 20, and the vibrating film 30 are not
limited to those described above. For example, the dividing method (the size and the number of
conductive regions, the arrangement method, etc.) of the diaphragm 30 may be appropriately set
along with the arrangement position of the through holes h1 or h2 according to the purpose of
directivity control of acoustic waves. Is possible. The light source may be a light emitting element
other than an LED or a fluorescent tube such as a cold cathode tube. Further, the traveling
direction of the incident light does not necessarily have to be perpendicular to the thickness
direction. The incident position is not limited to the end of the surface electrode 10 (so-called
edge light method). In short, light may be introduced into the inside of the surface electrode 10
and light may be emitted from the whole or a part of the surface of the surface electrode 10.
Moreover, it is not necessary to form the metal layer 11 and the light-diffusion layer 12 in all the
area ¦ regions other than the through-hole h1. For example, as shown in FIG. 7, the metal layer
11 and the light guide layer 13 are formed in all the regions other than the hole, while the light
diffusion layer 12 is formed using the surface electrode 10A formed in a partial region It is also
good.
[0028]
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Alternatively, as shown in FIG. 8, a surface electrode 10B in which each layer is formed in the
order of metal layer 14-light guide layer 15-light diffusion layer 16 in a region other than the
through hole h1 may be used. In this case, the incident light IL which has entered the inside of
the surface electrode 10B is guided to the entire light guiding layer 15 by the total reflection of
the light guiding layer. The light reflected by the metal layer 14 changes its path, and the light
whose angle is smaller than the total reflection angle comes out of the light guide layer 15
through the light diffusion layer 16 to the outside. By this, the whole light guide layer 15 emits
light uniformly. In the present invention, it is preferable that the light be irradiated uniformly in
the direction substantially perpendicular to the electrode surface. Further, the direction of the
light L emitted from the surface electrode 10 (10A, 10B) is not limited to the vertical direction as
in the above embodiment. For example, the scattering layer may be formed so as to scatter light
in a specific direction other than the vertical direction.
[0029]
The aperture ratio of the surface electrode 10 can be appropriately set in accordance with the
purpose and use of the acoustic lighting unit. Also, the arrangement method of the through holes
h1 and h2 is not limited to the above-described embodiment, but in order to secure the angular
range of directivity and the accuracy of control, it is preferable to arrange linearly in the X
direction.
[0030]
Further, it goes without saying that the acoustic lighting unit 1 according to the present
invention may be used by itself. For example, as an example of the application, there is
Schaucusten, which is an instrument for a doctor or the like to pick up and observe an X-ray. The
illumination function can be used to observe radiographs, while the acoustic function can be
used, for example, to allow the physician to report the diagnosis to the patient or other specialist
by voice. Specifically, a wireless communication unit is provided in the acoustic lighting unit 1,
and voice data relating to a doctor's speech at a distant place (for example, another department)
is received using this communication function, and this is used as acoustic lighting By
reproducing in unit 1, the doctor's remarks are transmitted to the patient etc. Further, a sound
collecting mechanism such as a microphone may be provided in the acoustic lighting unit 1 and
the sound collected by the acoustic lighting unit 1 may be transmitted to another communication
terminal by wireless communication. In addition, instead of separately providing a sound
collection mechanism such as a microphone, a partial region of the diaphragm 30 may function
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as a microphone.
[0031]
Alternatively, the acoustic lighting unit 1 can be used as an information providing device such as
a guide plate for notifying an image or a sound. The details will be described below. FIG. 9 shows
the appearance of an electronic guiding plate 200 to which the acoustic lighting unit 1 according
to the present invention is applied. As shown in the figure, the electronic guide plate 200 has a
display unit 210 for displaying the information S, an infrared camera 230, and a support unit
220 for installation on the ground or the like.
[0032]
FIG. 10 is a cross-sectional view of the display unit 210. As shown in FIG. As shown in the figure,
the display unit 210 is roughly divided into an acoustic lighting unit 1 and a display panel 201.
The display panel 201 is a display panel including a color filter 203, a polarizing filter 202, a
display element 204 such as a TFT (thin film transistor) having liquid crystal molecules provided
corresponding to each pixel, and a drive circuit (not shown). is there. The back surface of the
display panel 201 is in contact with the surface electrode 10 of the acoustic lighting unit 1. That
is, the irradiation light from the acoustic lighting unit 1 is used as a backlight of the display panel
201. In the display panel 201, no pixel is formed at a position corresponding to the through hole
h1 of the surface electrode 10. Therefore, while the character L and the image are displayed on
the display panel 201 by the light L emitted from the acoustic lighting unit 1, the area where the
image of the display panel 201 is not formed with the acoustic wave A emitted from the acoustic
lighting unit 1. And propagate from the surface of the display panel 201. The acoustic wave A is
also radiated from the back electrode 20.
[0033]
FIG. 11 is a functional block diagram of the electronic guiding plate 200. As shown in FIG. As
shown in the figure, the electronic guide plate 200 functions from a central control unit 290, a
storage unit 291, an input / output unit 292, a position detection unit 293, a sound control unit
294, and a bus 299 connecting the respective units. Configured The central control unit 290 is a
processor such as a CPU and controls each unit. The storage unit 291 is a storage device such as
a memory or a hard disk, and stores information for controlling the sound control unit 294. This
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information is written / read out by the central control unit 290. The input / output unit 292 is
an input device such as a keyboard or a display device such as a display, and is for externally
inputting control information and the like and notifying the user of the operation status and the
like. The position detection unit 293 includes an infrared camera 230 and a control circuit for
controlling the same, and a processor that analyzes an image captured by the infrared camera
230 and calculates user's position information. Identify the location of surrounding users. The
acoustic control unit 294 controls the directivity of the acoustic wave generated by the acoustic
lighting unit 1 based on the control information supplied from the central control unit 290 and
the position information detected by the position detection unit 293. Specifically, the position of
the user is detected, and an acoustic wave having directivity such that the sound pressure level
increases in the direction in which the user is present is generated.
[0034]
As described above, in the electronic guidance plate 200, the guidance information is displayed
on the display panel 201, and the related information is notified by voice. As a result, since
information can be transmitted to the user from both characters and images and sounds, a large
amount of information can be transmitted in a short time. In addition, the directivity can be
controlled so that the sound can reach substantially only a predetermined area (angle or angle
range), or the sound pressure level becomes sufficiently low outside the area, so that the
surrounding environment can be controlled. The voice information can be delivered to the user
while considering etc. Also, the directivity of the acoustic wave may be sequentially changed
according to the position of the user who is changing. By controlling the directivity in real time in
this manner, information can be effectively transmitted by voice even if the user does not stop in
front of the bulletin board. Further, in the electronic guide plate 200, it is not necessary to notify
information from both the character and the voice. For example, a portion of the display panel
201 is used as a general bulletin board for posting a paper medium etc. Is also possible in such a
manner as to notify the user as described above. Alternatively, the display panel 201 may be
detachably attached, and the light from the acoustic lighting device 1 may be provided to the
user as illumination when the display panel is removed.
[0035]
Note that the display panel 201 is not limited to a display element using liquid crystal, and
another display mechanism may be adopted as long as it requires a backlight in order not to emit
light by itself.
[0036]
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Further, in the above embodiment, the acoustic wave is emitted from both of the front surface
electrode 10 (10A, 10B) and the back surface electrode 20, but may be emitted only from the
back surface electrode 20.
Specifically, the through holes h1 are not provided in the surface electrodes 10 (10A, 10B). In
this case, the area of the light emitting surface of the irradiation light can be increased.
Furthermore, by providing a reflection plate for reflecting the sound on the outside of the back
electrode 20, the acoustic wave can be emitted substantially only in the forward direction (that is,
in the same direction as the light irradiation direction). Conversely, the acoustic wave may be
emitted only from the surface electrode 10 without providing the through hole h2 in the back
surface electrode 20. That is, the acoustic wave may be emitted from at least one of the front
surface electrode 10 and the back surface electrode 20.
[0037]
Also, when using the acoustic lighting unit 1 as a display shelf or display case, if the lighting
function is not necessary due to the environment of the room, etc., the acoustic function will be
exhibited while the lighting function will not be exhibited. It is also good. Also, the high
brightness LED 50 may be configured to be removable. For example, in an environment where
the lighting function is unnecessary, the high-brightness LED 50 may be removed from the LED
acoustic lighting unit 1. Also, if there is something that can be a light source (such as a room
light) near the installation place of the acoustic lighting unit 1 and part of the light enters from
the end face T, this light is used as the incident light IL. It is also possible to use the product in
such a way as to illuminate a product or the like placed on the acoustic lighting unit 1 from
below.
[0038]
FIG. 2 is an external perspective view of the acoustic lighting unit 1; It is a sectional view of an
acoustic lighting unit. FIG. 6 is a plan view of a vibrating membrane 30. FIG. 2 is a plan view of a
front surface electrode 10 and a back surface electrode 20. FIG. 2 is an external perspective view
of a display case 100. It is a figure showing the operation state of display case 100. As shown in
FIG. It is a top view of surface electrode 10A. It is a top view of surface electrode 10B. FIG. 6 is an
external perspective view of the electronic guiding plate 200. FIG. 2 is a cross-sectional view of a
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display panel 201. FIG. 6 is a functional block diagram of the electronic guiding plate 200.
Explanation of sign
[0039]
DESCRIPTION OF SYMBOLS 1 ...... Acoustic illumination unit, 10, 10A, 10B ... Surface electrode,
11, 14 ... Metal layer, 12, 16 ... Light-diffusion layer, 13, 15 ... Light guide layer, 20 * · · · · Back
electrode, 30 · · · vibrating membrane, 40 · · · support portion, 50 · · · high brightness LED, 60 · · ·
storage portion, h1, h2 · · · through hole, 100 · · · display case, 200: electronic guide plate, 201:
display panel, 202: polarization filter, 203: color filter, 204: display element, 210: display
portion, 220: support portion, 230 ... infrared camera, 290 ... central control unit, 291 ... storage
unit, 292 ... input / output unit, 293 ... position detection unit, 294 ... acoustic control unit, 299 ...
Bus, 300 ... membrane substrate, 301-313 ... conductive region.
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