JP2000004453A - Video display switching system and spectacles for watching video - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a trouble caused by a hard-to-watch image such as a double image in view, displaying a three-dimensional (3D) video when the wearing of spectacles is judged by a communication means and displaying a 2D video when no wearing of spectacles is judged. SOLUTION: The ON/OFF state of a switch 34 attached to spectacles 33 is supplied from the switch 34 to a monitor 31 by a cable 32. Namely, it is supplied from the ON/OFF state of the switch 34 through the cable 32 to the monitor 31 whether a viewer wears the spectacles 33 or not. According to this ON/OFF state of the switch 34, the 2D video/3D video to be displayed on the monitor 31 is switched. Therefore, only when the viewer wears the spectacles 33, the 3D video is displayed on the monitor 31 and when the viewer does not wear the spectacles 33, the 2D video can be displayed so that a hard-to- watch image can be prevented from being displayed on the monitor 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a video display switching system capable of switching and displaying a two-dimensional video and a video viewing glasses.

[0002]

2. Description of the Related Art Conventionally, as one of methods for displaying a three-dimensional image, there is a method using so-called field sequential in which left and right images are alternately displayed on a monitor for each field. Then, when trying to watch a three-dimensional video by the field sequential, the viewer needs to wear glasses for watching the three-dimensional video.

[0003]

However, when the viewer does not wear glasses for viewing three-dimensional images, for example, liquid crystal shutter glasses, the left and right images are viewed in an overlapping state, making it very difficult to view the images. There was a problem that became.

Accordingly, an object of the present invention is to provide a video display switching system and a video viewing system for automatically switching from a three-dimensional video to a two-dimensional video when glasses for three-dimensional video viewing are not worn. To provide eyeglasses.

[0005]

According to the first aspect of the present invention, a two-dimensional image and a three-dimensional image can be switched and displayed. When displaying a three-dimensional image, a left-eye image and a right-eye image are displayed. An image display device having a display unit for displaying an image for the eye, a separating unit for viewing the image for the left eye with the left eye, and viewing the image for the right eye with the right eye, The image display device displays a three-dimensional image when it is determined that the eyeglasses are worn by the communication means, and a two-dimensional image when it is determined that the eyeglasses are not worn by the communication means. An image display switching system characterized in that an image is displayed.

A reflector comprising a micro corner cube mirror is provided on the front of the glasses. A micro corner cube mirror that reflects the light output from the monitor reflects the reflected light in a direction opposite to the incident light.
As a result, it is determined that there is a viewer wearing glasses for viewing three-dimensional images, the left and right images are alternately displayed on the monitor in a field sequential manner, and the viewer can view the image three-dimensionally. it can. When the viewer does not wear glasses for viewing 3D images, the monitor
Displays a normal two-dimensional video. Further, when the glasses for viewing three-dimensional images are formed of liquid crystal shutters, a signal from the monitor is received, and the corresponding liquid crystal shutter is driven according to the signal. When the glasses are composed of polarizing filters, it is possible to switch between a two-dimensional image and a three-dimensional image only by reflecting a signal from a monitor.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, an example of displaying a three-dimensional video will be described to facilitate the description of the present invention.
FIG. 1 shows two factors that enhance the three-dimensional effect of the seven items of front-back feeling, depth feeling, glossiness, contrast enhancement, V aperture control, coring sharpness, and color enhancement. 1 is a first example in which the present invention is applied to a projection display.

In FIG. 1, a two-dimensional video signal (composite color video signal) is supplied to an input terminal 11. For example, a television broadcast signal received by an antenna and a tuner is an example of a two-dimensional video signal. In addition, analog satellite broadcasting, digital broadcasting,
A two-dimensional video signal may be received from a video signal reproducing device using a medium such as a disk or a tape.

An input color video signal is supplied to a Y / C separation circuit 12.
And a luminance signal Y and a chrominance signal (carrier chrominance signal) C
Are separated. The color signal C is supplied to the color demodulation circuit 13,
Color demodulation is performed. Two color difference signals (RY and BY) from the color demodulation circuit 13 are generated. The luminance signal Y and the color difference signals RY and BY are supplied to the front / rear sense / depth sense circuit 14. Before and after feeling and depth feeling circuit 14, as rear feeling and sense of depth applied luminance signal Y is a luminance signal Y _L, supplied to the gloss of the video signal path and contrast enhancement circuits 15L and color emphasizing circuit 17L for the left eye Is done. The signal subjected to the gloss and contrast enhancement in the gloss and contrast enhancement circuit 15L is supplied to a V aperture control coring sharpness circuit 16L.

[0010] V aperture control coring sharpness circuit luminance signal Y _L supplied to 16L is, V to lift the low-frequency or the frequency characteristic middle in the vertical direction of the change point of image
Coring sharpening that gives sharpness only to the aperture and edges having large and high frequency components is applied to the matrix circuit 18L. Also,
The color difference signals RY and BY from the front / rear sense / depth sense circuit 14 are used as color enhancement circuits 17L in the video signal path for the left eye.
Supplied to In the color enhancement circuit 17L, the color difference signal R
For -Y and BY, color enhancement is performed to enhance the color contrast of colors other than flesh color. The color difference signals RY and BY subjected to color emphasis are supplied to the matrix circuit 18L. Similarly to the left-eye video signal path, the right-eye video signal path is provided with a gloss / contrast emphasis circuit 15R, a V-apercom / coring sharpness circuit 16R, and a color emphasis circuit 17R.

In the description of this specification, L and R
Are used to indicate the correspondence between the left-eye image and the right-eye image. For simplicity, audio signal processing is omitted.

The three primary color signals R, G and B are formed by the matrix circuits 18L and 18R. Matrix circuit 1
The three primary color signals R, G, and B formed by 8L
It is supplied to the CRT drive circuit 20L via 9L.
The three primary color signals R, G,
B is a CRT drive circuit 20 via a preamplifier 19R.
Supplied to R.

CRT drive circuits 20L and 20R drive projection CRTs 21L and 21R, respectively. These CRT drive circuits and CR
T forms two projectors. As a projector, three CRs driven by each primary color signal
It is also possible to use T or a liquid crystal instead of a CRT. Further, the projector can use any of a reflection type and a transmission type configuration.

A left-eye image and a right-eye image generated by the projector are superimposed and displayed at substantially the same position on the screen 23. The left-eye image projected by the CRT 21L is assumed to have passed through the horizontal polarization filter 22L. On the other hand, the right-eye image projected by the CRT 21R is assumed to have passed through the vertical polarization filter 22R.

By using the glasses 24 having the horizontal polarization filter 25L for the left eye and the vertical polarization filter 25R for the right eye, it is possible to separate and view the images projected on the screen 23 by the CRTs 21L and 21R. It becomes possible. Note that the polarization filter used for the glasses 24 is not limited to the horizontal / vertical polarization filter, and may be any filter having a different polarization direction. For example, a right-handed / left-handed polarization filter may be used.

In this first example, a luminance signal Y which has been Y / C separated and chroma decoded and two color difference signals RY,
BY is input to the block of the front-back feeling and the parallel congestion shown by the front-back feeling / depth feeling circuit 14. Here, the right-eye signal is delayed by a fixed value more than the left-eye signal.
As a result, the signal for the right eye is shifted to the right on the display surface more than the signal for the left eye, and the image is fused farther than the display surface due to the principle of right and left parallax, resulting in parallel convergence.

In the first example, an example of displaying a three-dimensional image has been described. However, in order to switch the display of the three-dimensional image to display a two-dimensional image, a Y / C separation circuit 12 (not shown) is provided. The luminance signal Y from the color demodulator 13 and the color difference signals RY and BY from the color demodulation circuit 13 are
This is made possible by feeding R and 18L.

Next, a second example when a field double speed CRT is used is shown in FIG. A two-dimensional video signal (composite color video signal) is supplied to an input terminal 11. An input color video signal is supplied to a Y / C separation circuit 12, where a luminance signal Y and a chrominance signal (carrier color signal) C are separated. The color signal C is supplied to the color demodulation circuit 13 and color demodulated. Two color difference signals (RY and BY) from the color demodulation circuit 13 are generated. Luminance signal Y and color difference signal R
-Y and BY are supplied to the field doubling circuit 26.

In the field doubling circuit 26, the field double speed luminance signal 2Y, the color difference signals 2 (RY), 2 (B
-Y) and the pulse signal 2V are output. Luminance signal 2
Y, the color difference signals 2 (RY) and 2 (BY)
It is supplied to the depth sense circuit 14. In the front / back feeling / depth feeling circuit 14, the luminance signal Y to which the front / back feeling and the depth feeling are applied is supplied to the glossiness / contrast enhancement circuit 15 as the luminance signal Y. Glossy / contrast enhancement circuit 1
5, the signal subjected to the glossiness and contrast enhancement is applied to a V aperture control / coring sharpness circuit 16.
Supplied to

The luminance signal Y supplied to the V aperture control / coring sharpness circuit 16 is subjected to V aperture control and coring sharpness, and then supplied to the matrix circuit 18. The color difference signals RY and BY from the front / rear sense / depth sense circuit 14 are supplied to the color emphasizing circuit 17. The color emphasizing circuit 17 performs color emphasis on the color difference signals RY and BY. The color difference signals RY and BY subjected to color enhancement are supplied to the matrix circuit 18. The three primary color signals R, G, and B are formed by the matrix circuit 18. The three primary color signals R, G, B are
In the preamplifier & drive circuit 27, predetermined processing such as γ correction is performed, and the CRT 86 is driven to display an image on the CRT.

The front / rear sense / depth sense circuit 14 shown in FIG.
The gloss / contrast enhancement circuit 15 corresponds to the pulse signal 2V generated by the field doubling circuit 26. That is, the drive is changed according to the fields corresponding to the left and right eyes after the double speed.

The first example described above is an example of time axis modulation using two projectors, but in the second example,
This is an example using a field double speed CRT. In the case of the second example, the first field field-doubled is used as a left-eye video signal, and the field doubled second field is used as a right-eye video signal. The difference from the case where two projectors are used is that, for each doubled field, a signal for the left eye and a signal for the right eye are used, so that only one delay line for time axis modulation is required. However, since it is necessary to change the polarity of the modulation for the left eye and the right eye, it is necessary to reverse the polarity of the high frequency component for modulating the time axis for each doubled field. Further, when the delay time of only the right eye video signal is changed by setting the left eye video signal to a fixed delay time, the time axis modulation may be performed only for the right eye field. Conversely, the delay time of the right eye may be kept constant, and only the left eye field may be time-axis modulated.

In the second example, an example in which a three-dimensional image is displayed has been described. However, in order to switch the display of the three-dimensional image to display a two-dimensional image, a Y / C separation circuit 12 (not shown) is provided. The luminance signal Y from the color demodulator 13 and the color difference signals RY and BY from the color demodulation circuit 13 are
It becomes possible by supplying to

The processing by the field speed doubling circuit 26 will be described with reference to FIG. In FIG. 3, the color difference signal is omitted for simplicity. Field period Tv (NT
When an input luminance signal Y (FIG. 3A) of 1/60 second in the case of the SC system and 1/50 second in the case of the CCIR system is supplied, an output luminance signal (having a field period of 1/2 · Tv) is supplied. FIG. 3B) is formed. In other words, the field A of the input luminance signal is twice the field frequency of the field A.
A pair of 1 and A2 is formed, and a pair of fields B1 and B2 having twice the field frequency from the field B is formed. FIG. 3C shows a pulse signal 2V whose level is inverted every double speed field. Such doubling processing can be performed by a configuration in which the video signal is digitized and the time axis is compressed by a digital memory.

As described above, the first field (A) in which the pulse signal 2V synchronized with the double-speed field is at a high level.
, 1) are used as left-eye video signals, and the low-level second fields (A2, B2,...)
・) Is used as the right eye video signal. The field double speed circuit 26 outputs a field double speed luminance signal 2Y and a pulse signal 2V.

The processed luminance signal 2Y and color difference signal from the field doubling circuit 26 are supplied to the matrix circuit 18. The matrix circuit 18 forms the field double speed three primary color signals 2R, 2G, and 2B. The three primary color signals are supplied to the CRT 28 via a gloss enhancement circuit 84 and a preamplifier & drive circuit 85. CRT2
Reference numeral 8 denotes a configuration capable of displaying a field double speed color video signal. That is, the vertical scanning frequency and the horizontal scanning frequency of the CRT 28 are set to be twice those frequencies when displaying a video signal that is not double speed.

The image displayed on the CRT 28 includes a front / back feeling / depth feeling circuit 14, a glossiness / contrast enhancement circuit 15, a V aperture control / coring sharpness circuit 16,
The image is three-dimensionally emphasized by the color emphasizing circuit 17, so that a three-dimensional effect is produced even when viewed without wearing glasses. Furthermore, by wearing glasses with shutters provided on the left and right, the stereoscopic effect is enhanced. As the shutter provided to the glasses, a shutter that can be electrically turned on / off, for example, a liquid crystal shutter can be used. The shutter is a field doubler circuit 26
O by the pulse signal synchronized with the pulse signal 2V from
It is controlled to perform an N / OFF operation. As an example,
The pulse signal 2V is received from the receiver side by infrared transmission, and while the pulse signal 2V is at a high level, the left shutter is turned on and the right shutter is turned off.
When the pulse signal 2V is at the low level, ON /
Invert the OFF state. Thereby, CRT28
, The left-eye image and the right-eye image displayed by the left and right eyes, respectively, can be viewed. When viewing the left and right images separately, glossiness can be enhanced in addition to the stereoscopic effect.

FIG. 4 shows a first embodiment of the overall configuration of the video display device (hereinafter, referred to as a monitor) and the glasses. The monitor 31 and the glasses 33 composed of a liquid crystal shutter are connected by a cable 32. This cable 3
2, the on / off state of the switch 34 attached to the glasses 33 is supplied from the switch 34 to the monitor 31. That is, whether the viewer wears the glasses 33 from the on / off state of the switch 34 is supplied to the monitor 31 via the cable 32. According to the on / off state of the switch 34, the two-dimensional video /
The three-dimensional image is switched. As an example, the monitor 31
The signal transmitted from the camera to the glasses 33 via the cable 32 is a liquid crystal shutter switching signal of the glasses 33, and the signal transmitted from the glasses 33 to the monitor 31 via the cable 32 is a two-dimensional signal displayed on the monitor 31. It is a signal for switching between video and three-dimensional video.

This makes it possible to display a three-dimensional image on the monitor 31 only when the viewer wears the glasses 33, and to display a two-dimensional image when the viewer does not wear the glasses 33. Can be prevented from being displayed on the monitor 31.

As shown in the first embodiment, when the monitor 31 and the glasses 33 are connected by a cable, the viewing position is physically restricted and a cable connecting the glasses 33 and the monitor 31 is required. There is annoyance due to the existence of 32.

FIG. 5 shows a second embodiment in which the transmission path between the monitor and the glasses is wireless. The monitor 41 is provided with, for example, a signal transmission unit 42 composed of an LED (light emitting diode) and a signal reception unit 43 composed of a PD (photodiode). Similarly, the eyeglasses 44 composed of a liquid crystal shutter are provided with a signal receiving unit 45 composed of a PD and a signal transmitting unit 46 composed of an LED.

In this case, when the viewer wears the spectacles 44, a two-dimensional video / three-dimensional video switching signal is transmitted from the signal transmission unit 46. The 2D video / 3D video switching signal from the signal transmitting unit 46 is received by the signal receiving unit 43 of the monitor 41. The monitor 41 determines that there is a viewer wearing the glasses 44, and a liquid crystal shutter switching signal of the glasses 44 is transmitted from the signal transmission unit 42. The liquid crystal shutter switching signal from the signal transmitting unit 42 is received by the signal receiving unit 45 of the glasses 44. Signal receiving unit 45
In, the liquid crystal shutter of the glasses 44 is switched so that a three-dimensional image can be viewed in response to the received left / right switching signal.

As described above, when the transmission path is wireless, it is necessary for the monitor to always detect that a viewer is present or watching the screen, so that the glasses always keep sending some signal. And power consumption on the eyeglass side increases. For this reason, it is difficult to use a button-type battery or the like that can be used for lightweight glasses for a long time, and when a signal (IR signal, RF signal, etc.) of the same kind as the synchronization signal for switching the liquid crystal shutter of the glasses is used. In
There is a possibility of mutual interference.

FIG. 6 shows a third embodiment in which the transmission path between the monitor and the glasses is wireless. The monitor 51 has LE
A signal transmission unit 52 made of D and a signal reception unit 53 made of PD are provided immediately adjacent to the signal transmission unit 52. The spectacles 54 are provided with a reflector 55 constituted by a mirror as an example.

As described above, the synchronization signal for switching the shutter of the spectacles 54 based on the infrared signal or the like output from the signal transmission unit 52 is reflected by the reflector 55 and the signal reception unit 53
A method of detecting the presence or absence of a viewer and automatically switching the video display by receiving the message on the monitor 51 side is conceivable.

The reflector 55 attached to the glasses 54 is
It is necessary to be in a position and a direction completely facing the signal transmission unit 52 and the signal reception unit 53 of the monitor 51. At this time, the viewing position and posture are subject to very severe restrictions. For this reason, in the third embodiment,
The range of use is limited to applications such as computer displays and video games that always work against the display.

FIG. 7 shows a block diagram of a fourth embodiment of the present invention. First, the signal transmitting unit and the signal receiving unit on the monitor side will be described. A pulse signal 2V that is twice the vertical synchronization signal shown in FIG. 8A is supplied to the transmission amplifier 62 via the terminal 61. In the transmission amplifier 62, the supplied pulse signal 2V is amplified and supplied to the LED 63.
The anode of the LED 63 is connected to the transmission amplifier 62, and the cathode is grounded. A signal corresponding to the amplified pulse signal 2V is output from the LED 63. The signal transmission unit described above includes the transmission amplifier 62 and the LED 63
Consists of 8A supplied from the terminal 61.
Is composed of a clock frequency twice as high as that of the vertical synchronizing signal, and the interval between the vertical synchronizing signals is 8.33 msec (120
Hz). A signal as shown in FIG. 8B is output from the LED 63.

Signal output from LED 63 (FIG. 8B)
Is reflected by the reflector 77 provided on the front surface of the glasses 75 and received by the PD 64. The anode of the PD 64 is connected to the receiving amplifier 65, and the cathode is grounded. In the PD 64, the received signal is supplied to the receiving amplifier 65. In the receiving amplifier 65, the received signal is amplified and output via a terminal 66. The signal output from the terminal 66 is used as a signal for switching between two-dimensional video and three-dimensional video. The above-described signal receiving unit includes the PD 64 and the receiving amplifier 65.

Next, the glasses side will be described. The signal (FIG. 8B) output from the LED 63 is received by the PD 71.
The anode of the PD 71 is connected to the receiving amplifier 72,
Its cathode is grounded. In the PD 71, the received signal is supplied to the receiving amplifier 72. In the receiving amplifier 72, the received signal is amplified. The amplified signal is supplied to the driver 73L for the left eye via the driver 73R for the right eye and the inverter 74. In the driver 73R for the right eye, a signal for operating the shutter 76R for the right eye of the glasses 75 in accordance with the supplied signal is supplied to the shutter 76R for the left eye. In the driver 73L for the left eye, the shutter 76 for the left eye of the glasses 75 according to the supplied signal.
The signal for operating L is supplied to the shutter for left eye 76L. In addition, a reflector 77 is provided on the front surface of the glasses 75, and these circuits are combined in a circuit section 78 provided on the glasses 77.

In the fourth embodiment, a retroreflector such as a corner cube mirror is used as the reflector 77 provided on the front surface of the glasses 75. An example will be described.
FIG. 9 shows an example of a corner cube mirror. FIG.
As shown in A, three mirrors are combined so as to face each other at an angle of 90 degrees, and about 90 degrees (±
45 degrees), and has a characteristic of returning reflected light in the original direction by 180 degrees with respect to incident light from the range of 45 degrees. FIG. 9B shows an example of micro corner cube mirrors obtained by reducing the size of the corner cube mirror M as much as possible.

In order to return the reflected light in the same direction as the incident light in the micro corner cube mirror, a signal receiving section 53 must be arranged near the signal transmitting section 52. At this time, direct light from the signal transmission unit 52 is prevented from being incident on the signal reception unit 53. Thereby, if the viewer wearing the glasses 75 having the micro-corner cube mirror faces the signal transmitting unit 52 and the signal receiving unit 53 at an angle of ± 45 degrees or less, the signal transmitting unit 52 Is reflected by the micro corner cube mirror and reaches the signal receiving unit 53. Therefore, the presence of the viewer wearing the glasses 75 is detected, and it is possible to automatically switch the display between the two-dimensional video and the three-dimensional video.

In the above-described embodiment, glasses having liquid crystal shutters are used as glasses for viewing three-dimensional images used when displaying a three-dimensional image using the field doubled CRT shown in FIG. In the case of displaying a three-dimensional image using time-axis modulation using the two projectors shown in FIG. 1, glasses for viewing three-dimensional images composed of polarizing filters having different polarization directions may be used. For example, in the fourth embodiment shown in FIG. 7, when glasses comprising the polarizing filter and a monitor comprising two projectors are used, only a micro corner cube mirror is provided on the front of the glasses to provide a three-dimensional image. Can be seen.

In the above-described embodiment, a color filter may be used instead of the polarizing filter used in the glasses for viewing three-dimensional images.

The pulse signal 2V shown in the embodiment described above
Is used to drive a field double-speed CRT or a liquid crystal shutter, and the R / L of the pulse signal 2V depends on the driving method and the driving circuit method.
May be opposite to the phase shown in the example, as long as the phase performs the same operation as described above.

[0045]

According to the present invention, a three-dimensional image can be automatically displayed only when wearing three-dimensional image viewing glasses. Furthermore, when the spectacles are not worn, a normal two-dimensional image is displayed, so that an image that is difficult to see such as a double image is released from the troublesomeness of eyes.

According to the present invention, since the restriction on the viewing position is greatly eased, it is possible to view from a free position in a free posture. Further, since there is no need to transmit a signal for switching between 2D video and 3D video from the glasses side, it is possible to view for a long time even with a small and lightweight battery.

[Brief description of the drawings]

FIG. 1 is a first example of displaying a three-dimensional video signal.

FIG. 2 is a second example of displaying a three-dimensional video signal.

FIG. 3 is a schematic diagram for explaining field doubling.

FIG. 4 is a schematic diagram showing a first embodiment of the video switching system of the present invention.

FIG. 5 is a schematic diagram showing a second embodiment of the video switching system of the present invention.

FIG. 6 is a schematic diagram showing a third embodiment of the video switching system of the present invention.

FIG. 7 is a block diagram of a video switching system according to a fourth embodiment of the present invention.

FIG. 8 is a schematic diagram used for explaining signals of the video switching system of the present invention.

FIG. 9 is a schematic diagram of an example of a reflector applied to the present invention.

[Explanation of Reference Codes] 62: Transmission amplifier, 63: LED, 64, 7
1 ... PD, 65, 72 ... Reception amplifier, 73R
... Right driver, 73L ... Left driver, 74
... Inverter, 75 ... Eyeglass, 76R ... Shutter for right eye, 76L ... Shutter for left eye, 77
..Reflectors, 78 ... Circuit section

Continued on the front page (72) Inventor Masaharu Tokuhara 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5C061 AA01 AA03 AA13 AA27 AB11 AB12 AB17 AB20 AB24

Claims (9)

[Claims] 1. An image having a display unit for displaying a left-eye image and a right-eye image when displaying a three-dimensional image by switching between a two-dimensional image and a three-dimensional image. A display device, having a separating unit for viewing the image for the left eye with the left eye and viewing the image for the right eye with the right eye, and a communication unit for notifying the image display device that the image is worn. The image display device displays the three-dimensional image when the communication means determines that the eyeglasses are worn,
An image display switching system, wherein the two-dimensional image is displayed when it is determined that the glasses are not worn. 2. The video display switching system according to claim 1, wherein the display unit sequentially displays a left-eye video and a right-eye video. 3. The video display switching system according to claim 1, wherein the display unit combines and displays a left-eye video and a right-eye video. 4. The video display switching system according to claim 1, wherein said separation means turns on / off liquid crystal shutters for the left eye and the right eye. 5. The video display switching system according to claim 1, wherein said separation means is a polarization filter having a polarization direction different from each other. 6. The video display switching system according to claim 1, wherein the communication unit is a switch unit that is turned on / off in accordance with wearing and non-wearing of the glasses. 7. The video display device according to claim 1, further comprising: a first transmitting unit that transmits a signal; and a first receiving unit that receives a signal. A second transmitting means for transmitting a signal received by the receiving means; and a second receiving means for receiving a signal from the first transmitting means, wherein the second transmitting means transmits the signal from the second transmitting means to the second transmitting means. The video display device receives the signal by the first receiving means, determines whether or not the eyeglasses are worn, and controls the separating means based on the signal received by the second receiving means. Characterized video display switching system. 8. The image display device according to claim 1, further comprising: a light emitting unit; and a light receiving unit, wherein the glasses include a mirror for reflecting light from the light emitting unit to the light receiving unit. A video display switching system characterized by the following. 9. A pair of video viewing glasses for viewing a three-dimensional video, comprising: separating means for viewing a left-eye video with a left eye and a right-eye video with a right eye; Communication means for notifying the image display device of the image.