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DESCRIPTION JP2007243262

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DESCRIPTION JP2007243262
In a viewing angle controlled video display apparatus, audio of each video controlled by a
viewing angle can be independently heard without being mixed. A viewing angle control type
video display device provided with a viewing angle control display in which two different images
can be viewed depending on the viewing direction of the screen, and an audio output device is
provided corresponding to each viewing angle controlled image. And at least one of the audio
output devices is composed of an ultrasonic speaker having directivity. [Selected figure] Figure 1
Viewing angle controlled video display apparatus and audio separation method
[0001]
The present invention relates to a viewing angle controlled video display apparatus that
simultaneously displays different information and content depending on the direction in which
the screen is viewed, and in particular, a viewing angle controlled video that allows audio of each
video to be heard independently without mixing. The present invention relates to a display device
and an audio separation method.
[0002]
In recent years, a viewing angle provided with a viewing angle control display (a dual view
(registered trademark) liquid crystal display etc. capable of simultaneously displaying different
information and contents depending on the viewing direction of the screen) for simultaneously
displaying different information and contents depending on the viewing direction Controlled
video display devices are provided.
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This viewing angle control type video display device is used, for example, to display television
broadcast video on the right screen in television and to display the Internet screen on the left
screen, and in car navigation devices, map display on the driver's seat side, assistant It can be
used for applications such as displaying DVD (Digital Versatile Disk) images on the seat side.
[0003]
However, in this view angle-controlled video display device, the audio is simultaneously output
from a plurality of normal speakers, so that there is a problem that the audio is mixed even if the
video is separated.
[0004]
The present invention has been made to solve such a problem, and the object thereof is to allow
the audio of each image to be independently heard without being mixed in a viewing angle
controlled video display device provided with a viewing angle control display. It is an object of
the present invention to provide a viewing angle controlled video display device and an audio
separation method that can be used.
[0005]
The present invention has been made to solve the above problems, and a viewing angle control
type video display apparatus according to the present invention has a viewing angle control
provided with a viewing angle control display in which two different images can be viewed
depending on the viewing direction of the screen. Type video display device, wherein an audio
output device is provided corresponding to each video image controlled by a viewing angle, and
at least one of the audio output devices is configured by an ultrasonic speaker having directivity.
I assume.
With such a configuration, an ultrasonic speaker having directivity is used as an audio output
device of a viewing angle control type video display device in which different images can be seen
depending on the direction in which the screen is viewed.
As a result, the audio of each video image controlled by the viewing angle can be heard
independently without being mixed, and it can be viewed without the video and audio being
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mixed.
[0006]
Further, the viewing angle control type image display device of the present invention is
characterized in that the ultrasonic speaker is constituted by a piezoelectric ultrasonic
transducer. With such a configuration, a piezoelectric ultrasonic transducer is used as an
ultrasonic transducer in the ultrasonic speaker, and this makes it possible to use a simple and
inexpensive ultrasonic speaker for each image. Audio can be heard independently without
mixing.
[0007]
Further, the viewing angle control type image display apparatus of the present invention is
characterized in that the ultrasonic speaker is constituted by an electrostatic ultrasonic
transducer. With such a configuration, an electrostatic ultrasonic transducer is used as an
ultrasonic transducer in the ultrasonic speaker, so that the audio of each image can be
independently heard without being mixed. In addition to the effects that can be achieved, the
quality of the sound to be reproduced can be improved by means of an electrostatic ultrasonic
transducer having broadband characteristics.
[0008]
Further, the viewing angle controlled video display device of the present invention is configured
such that the video of two different television broadcasts is simultaneously displayed on the
viewing angle controlled display, and audio corresponding to each video of the television
broadcast is provided. It is characterized in that both of the output devices are constituted by
ultrasonic speakers. With such a configuration, two different videos of television broadcasting
are displayed on the viewing angle control display, and the sound of each video is output by the
ultrasonic speaker. As a result, the sound of two different television broadcasts can be heard
independently without being mixed, and it is possible to view without mixing the video and the
sound.
[0009]
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Further, the view angle control type image display device of the present invention is configured
as a device for car navigation, and the view angle control display displays an image for car
navigation toward the driver's seat side and faces the passenger side. And an audio output device
for the driver's seat corresponding to the car navigation video for the driver's seat, and an
assistant for the video for the passenger's seat. A voice output device for the seat side is
provided, and at least one of the voice output device for the driver's seat side and the voice
output device for the passenger's seat side is configured by an ultrasonic speaker having
directivity. Do. With such a configuration, in the view angle control display of the car navigation
device, a video for car navigation is displayed toward the driver's seat side, and a video for car
navigation and other video are displayed toward the passenger side. An ultrasonic speaker
having directivity can be used as an audio output device. Thus, the driver's side can use the
navigation information, and the passenger's side can enjoy television broadcasting and the like
without mixing video and audio.
[0010]
Further, the viewing angle control type image display device of the present invention is
characterized in that only the audio output device for the driver's seat side is constituted by an
ultrasonic speaker. With such a configuration, only the voice output device for the driver's seat
side is an ultrasonic speaker, and the speaker for the passenger seat side is a normal
loudspeaker. As a result, the driver's seat can hear the voice information for car navigation and
can simultaneously hear the voice (for example, music etc.) for the passenger's seat. On the other
hand, on the passenger side, for example, television broadcasting can be enjoyed without mixing
video and audio.
[0011]
Further, according to the viewing angle control type image display device of the present
invention, the voice for car navigation or the voice for other than car navigation for passenger
side may be used as the voice outputted from the ultrasonic speaker for driver's side. Is
configured to be selectable. With such a configuration, it is possible to select a voice for car
navigation or a voice for front passenger side as the sound outputted from the ultrasonic speaker
for driver's side. In the case of car navigation applications, for safety reasons, no video
information other than the navigation information is displayed on the display on the driver's side,
but basically any source may be provided as audio. Therefore, only the video for the driver's seat
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side is displayed as car navigation information, and the audio can be switched to the same audio
(for example, music etc.) as that for the same passenger and can be heard. Thereby, on the
driver's seat side, it is possible to view an image for car navigation and to hear an audio (for
example, music etc.) for the passenger seat side.
[0012]
Further, in the viewing angle control type video display device of the present invention,
television, DVD, and CD can be selected as contents to be displayed on the viewing angle control
display in addition to contents for car navigation, and the assistant It is characterized in that any
one of the car navigation, television, DVD, and CD audio can be selected as the audio output from
the audio output device for the seat side. With such a configuration, in addition to television
broadcasting, contents such as DVD / CD / HDD can be used as a source for displaying images.
As a result, on the passenger side, various contents can be displayed on the viewing angle control
display in addition to the television broadcast, and can be viewed without mixing video and
audio.
[0013]
The audio separation method of the present invention is a method for separating audio in a
viewing angle controlled video display apparatus provided with a viewing angle control display in
which two different images can be viewed depending on the direction in which the screen is
viewed. It is characterized by including a procedure of providing an audio output device
corresponding to an image, and a procedure of configuring at least one of the audio output
devices by an ultrasonic speaker having directivity. According to such a method, an ultrasonic
speaker having directivity is used for an audio output device of a view angle controlled video
display device in which different images can be seen depending on the direction in which the
screen is viewed. As a result, the audio of each video image controlled by the viewing angle can
be heard independently without being mixed, and it can be viewed without the video and audio
being mixed.
[0014]
DESCRIPTION OF THE OVERVIEW OF THE INVENTION Next, the best mode for carrying out the
present invention will be described with reference to the drawings. First, the outline of the
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present invention will be described.
[0015]
FIG. 1 is a view for explaining an outline of a first embodiment of a view angle control type video
display apparatus of the present invention, and an example in which the present invention is
applied to a television (also referred to simply as "television") is shown. It shows.
[0016]
In the view angle control type video display device 1 shown in FIG. 1, the television screen 13 is
constituted by a view angle control display (for example, dual view (registered trademark) liquid
crystal etc.) in which two different pictures can be seen depending on the screen viewing
direction. There is.
Then, on both sides of the television screen 13, ultrasonic speakers (1) 11 and ultrasonic
speakers (2) 12 are provided as audio output devices corresponding to the respective images.
[0017]
The driver 14 on the driver's seat and the passenger 15 on the passenger's seat can view
different images and sounds with the viewing angle control type television screen 13 and the
ultrasonic speakers 11 and 12 with strong directivity. it can. In addition, although the television
shown in FIG. 1 has shown the example of the vehicle-mounted television, of course, you may be
a normal household television.
[0018]
FIG. 2 is a view for explaining an outline of a second embodiment of the viewing angle control
type video display device of the present invention, and the present invention is applied to a car
navigation device (also referred to simply as "car navigation"). An example is shown.
[0019]
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In the view angle control type image display device 2 shown in FIG. 2, the navigation screen 23 is
constituted by a view angle control display (for example, dual view (registered trademark) liquid
crystal etc.) in which two different images can be seen depending on the screen viewing
direction. There is.
Then, on both sides of the navigation screen 23, ultrasonic speakers (1) 21 and ultrasonic
speakers (2) 22 are provided as audio output devices corresponding to the respective images.
[0020]
The driver 14 on the driver's side and the passenger 15 on the passenger's side can view
different images and sounds with the navigation screen 23 of view angle control type and the
ultrasonic speakers 21 and 22 with strong directivity. it can.
[0021]
As described above, in the view angle control type image display device of the present invention,
both the image and the sound are mixed by using the view angle control display in which
different images can be seen depending on the viewing direction of the screen and the ultrasonic
speaker having directivity. You will be able to watch without having to.
[0022]
In this case, the number of ultrasonic speakers used may be a plurality of ultrasonic speakers per
channel (channel) according to the audio system configuration such as monaural / stereo / multichannel sound.
[0023]
[Description of Ultrasonic Speaker Used in the Present Invention] The viewing angle control type
image display apparatus of the present invention is characterized by using an ultrasonic speaker
having directivity, and here, this ultrasonic speaker The configuration and operation of will be
described.
[0024]
The ultrasonic speaker has an ultrasonic transducer, and this ultrasonic transducer outputs a
modulated wave obtained by modulating the carrier wave of the ultrasonic band with an audio
signal in the audible band, thereby reproducing sound having sharp directivity. be able to.
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[0025]
FIG. 3 is a view showing an example of the configuration of an ultrasonic transducer used in the
viewing angle controlled video display device of the present invention.
The electrostatic ultrasonic transducer shown in FIG. 3 shows a schematic configuration of an
open-sided electrostatic ultrasonic transducer.
[0026]
The electrostatic ultrasonic transducer shown in FIG. 3 is sandwiched between a pair of fixed
electrodes 30, 31 including a conductive member formed of a conductive material functioning as
an electrode, and a pair of fixed electrodes, and a vibrating electrode (conductive layer) And a
vibrating membrane 32 having 32A.
The vibrating film 32 has a dielectric 32B to be an insulating layer and a vibrating electrode 32A
formed of a conductive material, and the vibrating electrode 32A has a single polarity (even
positive polarity) by the DC bias power supply 36. The DC bias voltage of any of the negative
polarities may be applied.
[0027]
Further, the pair of fixed electrodes 30, 31 have the same number and a plurality of through
holes 34 at the positions facing each other through the vibrating film 32, and between the pair of
fixed electrodes 30, 31, alternating current by the signal sources 37A, 37B. A signal is to be
applied.
Capacitors are respectively formed on the fixed electrode 30 and the vibrating electrode 32A,
and the fixed electrode 31 and the vibrating electrode 32A.
[0028]
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In the above configuration, in the electrostatic ultrasonic transducer, a DC bias voltage of a single
polarity (positive in this example) is applied to the vibrating electrode 32A of the diaphragm 32
by the DC bias power supply 36.
On the other hand, an alternating current signal is applied to the pair of fixed electrodes 30, 31
by the signal sources 37A, 37B.
As a result, in the positive half cycle of the alternating current signal output from the signal
sources 37A and 37B, a positive voltage is applied to the fixed electrode 30, so the surface
portion 33A of the vibrating film 32 not held by the fixed electrodes is The electrostatic repulsive
force acts on the surface portion 33A, and the surface portion 33A is pulled downward in FIG.
Further, at this time, since a negative voltage is applied to the opposing fixed electrode 31, an
electrostatic attraction force acts on the back surface portion 33B which is the back surface side
of the surface portion 33A of the vibrating film 32, The back surface portion 33B is pulled
further downward in FIG.
[0029]
Therefore, the film portion of the vibrating film 32 which is not held by the pair of fixed
electrodes 30 and 31 receives electrostatic repulsive force and electrostatic repulsive force in the
same direction. The same applies to the negative half cycle of the alternating current signal
output from the signal sources 37A and 37B, in the surface portion 33A of the vibrating
membrane 32 as shown in FIG. In FIG. 3, the electrostatic repulsive force acts on the upper side
in FIG. 3, and the film portion of the vibrating film 32 which is not sandwiched by the pair of
fixed electrodes 30, 31 receives the electrostatic repulsive force and the electrostatic repulsive
force in the same direction. . In this manner, the vibrating film 32 receives the electrostatic
repulsion and the electrostatic repulsion in the same direction according to the change of the
polarity of the alternating current signal, and the direction in which the electrostatic force acts
alternately changes. An audio signal of a sound pressure level sufficient to obtain a parametric
array effect can be generated.
[0030]
Thus, the ultrasonic transducer shown in FIG. 3 is called a Push-Pull type electrostatic ultrasonic
transducer because the vibrating membrane 32 vibrates by receiving force from the pair of fixed
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electrodes 30 and 31. ing.
[0031]
As described above, in the push-pull type electrostatic ultrasonic transducer, a high voltage DC
bias voltage is applied to the vibrating film, and an alternating voltage is applied to the fixed
electrode, whereby the fixed electrode-vibration film is obtained. The membrane portion vibrates
due to the electrostatic force (attractive force and repulsive force) acting on the
In this case, in order to realize the vibration of the ultrasonic band, it is necessary to set the hole
diameter of the vibrating portion to several mm or less, and as shown in FIG. 3B, providing a
large number of through holes (vibration holes) 34. Therefore, it is necessary to configure a
transducer with high tracking ability and a large output.
[0032]
In addition, as the shape of the fixed electrodes 30 and 31, a circular through hole type, a twostep through hole, a tapered through hole, and the like are possible. The material of the fixed
electrodes 30 and 31 may be any conductive material, for example, a single configuration of SUS,
brass, iron, or nickel is also possible. In addition, since it is necessary to reduce the weight, a
desired hole processing is performed on a glass epoxy substrate or paper phenol substrate
generally used for a circuit substrate or the like, and then plating with nickel, gold, silver, copper
or the like is performed. Things are also possible. In this case, in order to prevent warpage after
molding, it is also effective to apply plating on the substrate on both sides. However, in the case
of using a double-sided electrode vapor deposition film or an electret film, some vibrating
treatment is required on the vibrating film side of each of the fixed electrodes 30 and 31. For
example, it is necessary to perform insulating thin film processing with alumina, silicon polymerbased material, amorphous carbon film, SiO 2 or the like.
[0033]
Next, with regard to the vibrating film 32, as described above, the function of the film always
stores electric charges of the same polarity (it may be + or-), and vibrates by the electrostatic
force between the fixed electrodes changing by the alternating voltage. It is a thing. As a
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structure, a double-sided electrode vapor deposition film, a structure in which an electrode layer
is sandwiched by an insulating polymer film, a structure in which two single-sided electrode films
are laminated so that the electrode surfaces are in contact may be considered.
[0034]
The insulating film is preferably a polymer material such as polyethylene terephthalate
(polyester), polyester (polyester), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS),
etc. in view of stretchability and electric resistance. The electrode deposition material is most
commonly aluminum (Al), and in addition, Ni, Cu, SUS, Ti, etc. are desirable from the viewpoint of
compatibility with the above-mentioned polymer material, cost and the like. The thickness of the
insulating polymer film can not be determined uniquely because the optimum value varies
depending on the driving frequency, the fixed electrode hole size, and the like, but in general, it is
approximately sufficient in the range of 1 μm to 100 μm. The electrode deposition thickness is
also preferably in the range of 40 nm to 200 nm. When the electrode thickness is too thin,
almost no charge can be accumulated, and when it is too thick, the film becomes hard, leading to
a problem that the amplitude decreases. Further, as the electrode material, a transparent
conductive film ITO / In, Sn, Zn oxide or the like may be used.
[0035]
The thickness of the electrode film is also preferably in the range of 40 nm to 200 nm. Also, the
material thickness of the insulating polymer film sandwiching it is the same as that of the doublesided electrode deposition film, and poly-ethylene-terephthalate (PET), poly-ester, poly-ethylenenaphthalate (PEN), poly-phenylene sulfide (PPS) And preferably has a thickness of 1 μm to 100
μm.
[0036]
In the case of a structure in which two single-sided electrode films are laminated so that the
electrode surfaces are in contact with each other, the conditions of the insulating film and the
electrode portion are preferably the same as those of the other vibrating films described above.
[0037]
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In addition, although a direct current bias voltage of several hundred volts is required for the
vibrating film, the bias voltage can be reduced by applying tension to the film at the time of
manufacturing the film unit.
This is because, by applying tension to the film in advance, the same effect as the tensile tension
which the conventional bias voltage has been carried out is obtained, and this is a very effective
means for reducing the voltage. Also in this case, Al is the most common as the membrane
electrode material, and in addition, Ni, Cu, SUS, Ti, etc. are desirable from the viewpoint of
compatibility with the above-mentioned polymer material, cost and the like. Furthermore, a
transparent conductive film ITO / In, Sn, Zn oxide or the like may be used.
[0038]
Next, although it is a fixed material (case) of the said fixed electrode or a vibrating film, plastic
type materials, such as an acryl, Bakelite, polyacetal (polyoxymethylene) resin (POM), are
preferable from a lightweight and a nonconductive viewpoint.
[0039]
Although the push-pull type electrostatic ultrasonic transducer has been described above, a
piezoelectric type ultrasonic transducer other than the electrostatic type ultrasonic transducer
can be used as an ultrasonic transducer which can be used in the view angle-controlled image
display device of the present invention. Transducers can also be used.
[0040]
FIG. 4 is a view showing an example of the configuration of a piezoelectric transducer, in which a
piezoelectric ceramic is used as a vibrating element to convert an electrical signal into an
ultrasonic wave, and convert an ultrasonic wave into an electrical signal (transmission and
reception of ultrasonic wave) 7 shows an example of the configuration of a piezoelectric
ultrasonic transducer that performs both of the above.
4A shows a bimorph ultrasonic transducer, and FIG. 4B shows a unimorph ultrasonic transducer.
[0041]
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The bimorph-type ultrasonic transducer shown in FIG. 4A comprises two piezoelectric elements
(piezoelectric ceramic) 41 and 42, a cone 43, a case 44, leads 45 and 46, and a screen 47. There
is.
The piezoelectric elements 41 and 42 are bonded to each other, and the lead 45 and the lead 46
are connected to the surface opposite to the bonding surface, respectively. In the unimorph type
ultrasonic transducer shown in FIG. 4B, the configuration of the piezoelectric element 48 is
different from that of the bimorph type, but basically the operation principle is the same.
[0042]
The piezoelectric ultrasonic transducers shown in FIGS. 4A and 4B utilize the resonance
phenomenon of the piezoelectric ceramic, so the characteristics of transmission and reception of
ultrasonic waves are relatively narrow around the resonance frequency. It becomes good in the
frequency band. However, since the piezoelectric transducer utilizes the sharp resonance
characteristic of the element, high sound pressure can be obtained, but the frequency band is
very narrow. For this reason, in an ultrasonic speaker using a piezoelectric transducer, the
reproducible frequency band is narrow, and there is a tendency that the reproduction sound
quality is worse compared to the loudspeaker.
[0043]
Next, FIG. 5 shows a general configuration example of an ultrasonic speaker. An ultrasonic
speaker performs AM modulation with an audio signal (audible area signal) on an ultrasonic
wave called a carrier wave, and when this is emitted into the air, the original audio signal is selfreproduced in the air due to air nonlinearity. It is. That is, since the sound wave is a compression
wave propagating through the air as a medium, in the process of propagating the modulated
ultrasonic wave, the dense part of the air and the sparse part appear prominently, and the dense
part has a high speed of sound and is sparse. As the sound velocity is slowed in the part, the
modulation wave itself is distorted, so that the waveform is separated into the carrier wave
(ultrasonic wave) and the audio wave (original audio signal), and we human beings only audible
sound below 20 kHz (original audio signal) Is a principle that can be heard, and is generally
called a parametric array effect.
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[0044]
The ultrasonic speaker 50 shown in FIG. 5 includes a sound source (audio signal) 51 that
generates a signal wave in the audible wave frequency band, a carrier wave signal source 52 that
generates and outputs a carrier wave in the ultrasonic frequency band, and a modulator 53. , A
power amplifier 54, and an ultrasonic transducer 55.
[0045]
In the above configuration, the carrier wave in the ultrasonic frequency band output from the
carrier wave signal source 52 is modulated by the modulator 53 by the audio signal output from
the sound source 51, and the ultrasonic transducer 55 is modulated by the modulation signal
amplified by the power amplifier 54. Drive.
As a result, the modulated signal is converted to a sound wave of a finite amplitude level by the
ultrasonic transducer 55, and this sound wave is emitted into the medium (in air) and the sound
noise in the original audio frequency band by the nonlinear effect of the medium (air). Is selfregenerating.
[0046]
[Description of Configuration Example of View Angle Control Type Video Display Device of the
Present Invention] Next, a configuration example of the view angle control type video display
device of the present invention will be described.
[0047]
FIG. 6 is a view showing a configuration example of a first embodiment of a viewing angle
controlled video display device of the present invention.
The configuration example shown in FIG. 6 is a configuration example when the present
invention shown in FIG. 1 is applied to a television. FIG. 6A shows a configuration example in the
case of two-screen content (content for displaying different video images on the viewing angle
control display 110). FIG. 6B shows an example in the case of one content (content in which a
separate video is not displayed on the viewing angle control display 110).
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[0048]
In FIG. 6A, the tuner / input circuit 101 receives a television radio signal modulated by a video
signal and an audio signal, and selects a television radio signal from a desired broadcast station.
The signal of the television broadcast selected by the tuner / input circuit 101 is sent to the
audio signal separation circuit 102 and the video signal processing circuit 103. In the
configuration example shown in FIG. 6 (A), in addition to television broadcasting, content such as
DVD (Digital Versatile Disk) / CD (Compact Disc) / HDD (Hard Disk Drive) etc. is used as a source,
so the input unit Is the tuner / input circuit 101 (the same applies to the tuner / input circuit 101
of the car navigation system shown in FIG. 7).
[0049]
The audio signal separation circuit 102 separates the audio signal from the television broadcast
signal sent from the tuner / input circuit 101, and detects and demodulates the television audio
signal. The video signal processing circuit 103 demodulates a video signal for displaying a video
on the viewing angle control display 110 from the television broadcast signal received from the
tuner / input circuit 101. The video signal processing circuit 103 includes a video amplification
circuit for amplifying a video signal, a color circuit for separating a color signal, and a
synchronization detection circuit for synchronously detecting a color signal using a wave having
a specific phase relationship with a color carrier. Is included. The tuner / input circuit 101, the
audio signal separation circuit 102, and the video signal processing circuit 103 correspond to
not a single channel but a multichannel in order to display two images by viewing angle control.
[0050]
The audio signal output from the audio signal separation circuit 102 is sent to the modulation
circuit 105. The modulation circuit 105 modulates the carrier signal of the ultrasonic frequency
band generated by the ultrasonic wave generation circuit 104 based on the audio signal output
from the audio signal separation circuit 102. The modulation signal generated by the modulation
circuit 105 is amplified by the power amplifier 106, and the ultrasonic speaker (1) 107 that
outputs the voice (1) and the ultrasonic speaker (2) 108 that outputs the voice (2) are driven. Do.
The modulation circuit 105 and the power amplifier 106 also support multi-channels instead of
single channels.
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[0051]
On the other hand, an image (1) is displayed on one display (1) 111 of the viewing angle control
display 110 by an image signal generated by the image signal processing circuit 103 and an
image (2) is displayed on the other display (2) 112. Is displayed. Here, the images (1) and (2) do
not mean merely a two-screen television, but mean an image according to a viewing angle control
display in which different images can be seen depending on the direction in which the screen is
viewed.
[0052]
Further, FIG. 6B shows an example in the case of displaying a single content, and by turning off
the switch 10113A, only the sound (1) can be outputted from the ultrasonic speaker (1) 107. .
When the switch 113A is turned on, the sound (1) from the ultrasonic speaker (1) 107 and the
sound (2) from the ultrasonic speaker (2) 108 can be simultaneously output. In this case, the
same sound is output from the two ultrasonic speakers. For example, when the television is for
use in a car, the driver and the passenger can listen to the same sound.
[0053]
Further, by turning off the switch 113B, only the video (1) of the display (1) 111 of the viewing
angle control display 110 can be displayed. When the switch 113B is turned ON, the video (1) of
the display (1) 111 and the video (2) of the display (2) 112 can be displayed simultaneously. In
this case, the same image is displayed by the two displays 111 and 112. For example, if the
television is for use in a car, the driver and the passenger can see the same image. However, in
the case of driving, it is natural that displaying the television image on the display (1) 111 on the
driver's seat side is not permitted for safety.
[0054]
FIG. 7 is a view showing a configuration example of a second embodiment of the viewing angle
controlled video display device of the present invention. The configuration example shown in FIG.
7 is a configuration example when the present invention shown in FIG. 2 is applied to a car
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navigation system. Note that FIG. 7A shows a configuration example in the case of two-screen
content (content for displaying different videos on the viewing angle control display 110) as in
FIG. 6A. FIG. 7B shows an example in the case of a single screen content (content for displaying
the same video on the viewing angle control display 110) as in FIG. 6B.
[0055]
The basic configuration of the configuration example shown in FIG. 7 is the same as that of the
television shown in FIG. The only difference is that the image displayed on the display (1) 111 on
the driver's seat side of the viewing angle control display 110 is navigation information. That is,
in the configuration example shown in FIG. 7, the video (1) is navigation information and is a
screen viewed from the driver's seat side. Further, the audio (1) of the ultrasonic speaker (1) 107
corresponds to the video (1). Also, the video (2) is a screen viewed from the passenger side. The
sound (2) of the ultrasonic speaker (2) 108 corresponds to the image (2).
[0056]
In the car navigation application, for safety reasons, the video information other than the
navigation information is not displayed on the display (1) 111 on the driver's seat side, but
basically any source may be provided as audio. Therefore, in the example of the car navigation
system shown in FIG. 7, on the driver's seat side, only the video (1) directed to the driver's seat
side is displayed as car navigation information, and the same voice (2) as the driver's seat side
voice (1) ) (For example, music) can be switched to listen.
[0057]
Further, only the voice output device for the driver's seat can be an ultrasonic speaker, and the
voice output device for the passenger's seat can be a normal loudspeaker. By so doing, on the
driver's side, voice information for car navigation can be heard from the ultrasonic speaker, and
voice (for example, music etc.) for the passenger's seat side can be heard simultaneously.
[0058]
As described above, the viewing angle control type video display device of the present invention
is provided with a viewing angle control display which simultaneously displays different
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information and contents depending on the viewing direction of the screen, and the directivity is
made to correspond to each video. Since the use of the ultrasonic speaker which has it is carried
out, this can be made to sound independently without mixing the sound of each picture.
[0059]
As mentioned above, although the embodiment of the present invention was described, the view
angle control type image display device of the present invention is not limited only to the abovementioned example of illustration, and various changes can be made within the scope of the
present invention. Of course it is possible to add
[0060]
FIG. 1 is a diagram showing an outline of a first embodiment of a viewing angle controlled video
display apparatus.
The figure which shows the outline | summary of 2nd Embodiment of a viewing angle control
type | mold video display apparatus.
The figure which shows the structural example of an electrostatic-type ultrasonic transducer. The
figure which shows the structural example of a piezoelectric-type ultrasonic transducer. The
figure which shows the example of a general configuration of an ultrasonic speaker. FIG. 1 is a
diagram showing the configuration of a first embodiment of a viewing angle control type video
display apparatus. FIG. 7 is a diagram showing the configuration of a second embodiment of a
viewing angle controlled video display device.
Explanation of sign
[0061]
1, 2 ... view angle control type image display device, 11, 21 ... ultrasonic speaker (1), 12, 22 ...
ultrasonic speaker (2), 13 ... television screen, 14 ... driver, 15 ... passenger, 23 Navigation screen
30, 31: fixed electrode 32, 32: vibrating film, 32A: vibrating electrode, 32B: dielectric, 34:
through hole, 36: DC bias power supply, 37A, 37B: signal source, 41, 42, 48: piezoelectric
Elements 43: cone 44: case 45, 46: lead 47: screen 50: ultrasonic speaker 51: sound source
(audio signal) 52: carrier signal source 53: modulator 54: power amplifier 55: ultrasonic
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transducer, 101 tuner / input circuit, 102: audio signal separation circuit, 103: video signal
processing circuit, 104: ultrasonic wave generation circuit, 105: modulation circuit, 06 ... power
amplifier, 107 and 108 ... ultrasonic speaker, 110 ... viewing angle control display, 111, 112 ...
display, 113A, 113B ... switch
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