JP2012109702A - Image display system, image display apparatus, and method of controlling image display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display system, an image display apparatus, and a method of controlling the image display system which are capable of suppressing synchronous difference between an image display and opening/closing of shutter glasses.SOLUTION: Unshown front surfaces of liquid crystal shutter glasses 4 are respectively provided with a receiving part for receiving an infrared synchronizing signal transmitted from a synchronizing signal transmitter 3. The liquid crystal shutter glasses 4 are configured to alternately open left and right liquid crystal shutters 45L and 45R in synchronization with the synchronizing signal so that an image for a left eye is recognized only by the left eye of a viewer, and an image for a right eye is recognized only by the right eye of the viewer. An unshown front surface of a projector 2 is also provided with a receiving part for receiving the infrared synchronizing signal transmitted from the synchronizing signal transmitter 3. The projector 2 switches displays of the image for the left eye and the image for the right eye in synchronization with the synchronizing signal.

Description

  The present invention relates to an image display system, an image display apparatus, and an image display system control method that allow a viewer to recognize a displayed image as a stereoscopic image.

  Various systems have been proposed in which different images (parallax images) are visually recognized by the viewer's right eye and left eye in order to allow the viewer to recognize an image displayed by an image display device (for example, a projector) as a stereoscopic image. As one of such systems, for example, there is a system in which an image display device alternately displays a left-eye image and a right-eye image in a time-sharing manner (see, for example, Patent Document 1). In this aspect, the viewer can recognize the stereoscopic image by viewing the image through shutter glasses that are alternately opened and closed in synchronization with the change of the image. For example, a system (stereoscopic video display device) described in Patent Document 1 includes an image display device (liquid crystal display), an image supply device (video data output device) that supplies image information (video data) to the image display device, The shutter glasses are provided with a synchronization signal output device (liquid crystal shutter control unit) that outputs a synchronization signal (control signal) to the shutter glasses and controls the opening and closing of the shutter glasses.

JP 2009-152897 A

  However, as in the system described in Patent Document 1, when the synchronization signal output device is arranged separately from the image display device, image switching by the image display device and shutter glasses Deviation tends to occur in synchronization with opening and closing operations. For this reason, there is a problem that the display quality of the image is deteriorated, such as crosstalk in which both the left and right images are recognized by one eye.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An image display system according to this application example displays an image for the left eye and an image for the right eye alternately based on image information supplied from the image supply device; A synchronization signal transmitting device that wirelessly transmits a synchronization signal for synchronizing with switching between the left-eye image and the right-eye image, and the left-eye shutter and the right-eye shutter are alternately opened. An image display system comprising: shutter glasses that cause the shutter glasses to receive the synchronization signal transmitted from the synchronization signal transmission device; and the synchronization signal received by the reception unit. A drive unit that drives opening and closing of the shutter for the left eye and the shutter for the right eye, and the image display device includes an image information input unit that receives image information from the image supply device. An image display unit that displays an image based on the image information, a reception unit that receives the synchronization signal transmitted from the synchronization signal transmission device, and the left eye based on the synchronization signal received by the reception unit And a control unit that switches between display of the right image and display of the image for the right eye.

  According to this image display system, the image display device switches between the display of the image for the left eye and the display of the image for the right eye based on the synchronization signal, and the shutter glasses are the shutter for the left eye based on the synchronization signal. And it drives the opening and closing of the shutter for the right eye. In other words, since both the image display device and the shutter glasses perform the left / right switching based on the synchronization signal transmitted from the synchronization signal transmission device, the image switching in the image display device and the driving of the shutter in the shutter glasses are more performed. It is possible to accurately synchronize, and it is possible to suppress a decrease in image display quality.

  Application Example 2 In the image display system according to the application example described above, the synchronization signal transmission device may transmit the synchronization signal as an infrared signal.

  Application Example 3 In the image display system according to the application example, the image display device may be a projector.

  Application Example 4 In the image display system according to the application example described above, the image display device may be connected to the image supply device via a DVI interface or an HDMI interface.

  Application Example 5 In the image display system according to the application example described above, the synchronization signal transmission device receives a reference signal from the image supply device and wirelessly transmits the synchronization signal based on the reference signal. Also good.

  Application Example 6 In the image display system according to the application example described above, the reference signal may be input to the synchronization signal transmission device from the image supply device via a USB interface.

  Application Example 7 The image display device according to this application example is an image display device that alternately displays a left-eye image and a right-eye image based on image information supplied from the image supply device. An image information input unit for inputting image information from the image supply device, an image display unit for displaying an image based on the image information, a receiving unit for receiving a synchronization signal transmitted wirelessly, and the receiving unit And a control unit that switches between display of the image for the left eye and display of the image for the right eye based on the synchronization signal received.

  According to this image display device, the display of the image for the left eye and the display of the image for the right eye are switched based on the synchronization signal transmitted wirelessly. For this reason, by using in combination with shutter glasses that drive opening and closing of the left-eye shutter and right-eye shutter based on the same synchronization signal, switching of images in the image display device and driving of the shutters in the shutter glasses are further performed. It becomes possible to synchronize accurately.

  Application Example 8 In the image display system control method according to this application example, an image display that alternately displays a left-eye image and a right-eye image based on image information supplied from an image supply device. A synchronization signal transmitting device that wirelessly transmits a synchronization signal for synchronizing with switching between the image for the left eye and the image for the right eye, and a shutter for the left eye and a shutter for the right eye A control method of an image display system including shutter glasses that are alternately opened, wherein the synchronization signal transmitting device synchronizes with switching between the left-eye image and the right-eye image. A transmission step of wirelessly transmitting the image, and the image display device receives the synchronization signal, and switches display between the left-eye image display and the right-eye image display based on the synchronization signal. Ste A shutter driving step for receiving the synchronization signal and driving opening and closing of the shutter for the left eye and the shutter for the right eye based on the synchronization signal. And

  According to the control method of the image display system, the image display device switches between the left-eye image display and the right-eye image display based on the synchronization signal, and the shutter glasses are switched based on the synchronization signal. Drives the opening and closing of the eye shutter and right eye shutter. In other words, since both the image display device and the shutter glasses perform the left / right switching based on the synchronization signal transmitted from the synchronization signal transmission device, the image switching in the image display device and the driving of the shutter in the shutter glasses are more performed. It becomes possible to synchronize accurately.

The block diagram which shows schematic structure of an image display system. The block diagram which shows the internal structure of a synchronizing signal transmitter and liquid crystal shutter glasses. The block diagram which shows the internal structure of a projector. It is a timing chart for demonstrating operation | movement of an image display system, (a) is a figure which shows the image information output to a projector from a computer, (b) is a synchronizing signal output to a synchronizing signal transmission apparatus from a computer. (C) is a figure which shows the synchronizing signal transmitted from a synchronizing signal transmitter, (d) is a figure which shows the image displayed by a projector, (e) is a liquid crystal for left eyes The figure which shows the control signal which opens and closes a shutter, (f) is a figure which shows the control signal which opens and closes the liquid-crystal shutter for right eyes.

Hereinafter, the image display system of the present embodiment will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing a schematic configuration of the image display system of the present embodiment.
As shown in FIG. 1, an image display system 100 is a system that allows a viewer to recognize a stereoscopic image using binocular parallax, and includes a computer 1 as an image supply device, a projector 2 as an image display device, The synchronization signal transmitting device 3 and the liquid crystal shutter glasses 4 are provided.

  The computer 1 is a general personal computer and supplies image information to the projector 2. Software for realizing stereoscopic viewing is installed in the computer 1, and the computer 1 includes image information for the left eye that represents an image for the left eye and an image for the right eye that represents an image for the right eye. Information is alternately output in units of frames.

  The projector 2 is connected to a DVI (Digital Visual Interface) terminal which is one of image output terminals of the computer 1 and projects an image based on image information supplied from the computer 1 onto the screen SC. That is, the projector 2 alternately displays the left-eye image and the right-eye image on the screen SC in a time-divided manner in units of frames.

  The synchronization signal transmitting device 3 is connected to a USB (Universal Serial Bus) terminal of the computer 1, and a synchronization signal (reference) for synchronizing with the switching between the left-eye image and the right-eye image from the computer 1. Signal) is input. The synchronization signal transmission device 3 modulates the synchronization signal supplied from the computer 1 to generate an infrared synchronization signal and transmits it to the outside.

  The liquid crystal shutter glasses 4 are attached to a viewer who views an image projected by the projector 2, and includes a liquid crystal shutter 45L for the left eye facing the viewer's left eye and a right eye facing the right eye. Liquid crystal shutter 45R. On the front surface (not shown) of the liquid crystal shutter glasses 4, a receiving unit 41 (see FIG. 2) for receiving an infrared synchronizing signal transmitted from the synchronizing signal transmitting device 3 is provided. The liquid crystal shutter glasses 4 synchronize with the synchronization signal so that the left eye image is recognized only by the viewer's left eye and the right eye image is recognized only by the viewer's right eye. 45L and 45R are opened alternately.

  In addition, a reception unit 25 (see FIG. 3) for receiving an infrared synchronization signal transmitted from the synchronization signal transmission device 3 is provided on the front surface of the projector 2 (not shown). The display of the image for the left eye and the image for the right eye is switched in synchronization. The synchronization signal transmission device 3 may be placed in front of the viewer wearing the liquid crystal shutter glasses 4 and the projector 2 and transmit the synchronization signal toward the rear (opposite to the projection direction). Alternatively, the synchronization signal may be transmitted forward and reflected by the screen SC. The positions where the receiving units 25 and 41 are provided are not limited to the front surface of the projector 2 or the liquid crystal shutter glasses 4 and may be provided on other surfaces. Further, a plurality of receiving units 25 and 41 may be provided so that the synchronization signal can be received from various directions.

FIG. 2 is a block diagram showing the internal configuration of the synchronization signal transmission device 3 and the liquid crystal shutter glasses 4.
As illustrated in FIG. 2, the synchronization signal transmission device 3 includes an input unit 31, a control unit 32, a modulation unit 33, and a transmission unit 34. A synchronization signal (reference signal) having a predetermined waveform pattern is input to the input unit 31 from the USB terminal of the computer 1. This synchronization signal is a signal for synchronizing the switching between the image for the left eye and the image for the right eye by the projector 2 and the opening / closing of the liquid crystal shutters 45L and 45R.

  The control unit 32 processes the synchronization signal input to the input unit 31 as necessary and outputs it to the modulation unit 33, and the modulation unit 33 modulates the synchronization signal and outputs it to the transmission unit 34.

  The transmission part 34 is comprised by the light emitting diode etc. which emit infrared rays, and transmits the synchronizing signal modulated by the modulation part 33 to the exterior as a blinking signal of infrared rays. The transmitted synchronization signal is received by the liquid crystal shutter glasses 4 and the projector 2.

  The liquid crystal shutter glasses 4 include a reception unit 41, a demodulation unit 42, a control unit 43, and a drive unit 44 in addition to the liquid crystal shutters 45L and 45R described above. The receiving unit 41 includes a photo sensor or the like, receives (receives) an infrared synchronization signal transmitted from the synchronization signal transmitting device 3, converts it into an electrical signal, and outputs the electrical signal to the demodulation unit 42.

  The demodulator 42 demodulates the received synchronization signal and outputs it to the controller 43. The control unit 43 generates a control signal for controlling opening and closing of the liquid crystal shutters 45L and 45R based on the demodulated synchronization signal, and outputs the control signal to the driving unit 44. The drive unit 44 drives opening and closing (opening and closing) of the liquid crystal shutters 45L and 45R based on the input control signal.

  Each of the liquid crystal shutters 45L and 45R has a configuration in which polarizing plates are attached to both the front and back sides of the liquid crystal panel. The liquid crystal shutter 45L is switched between an open state in which light incident on the left eye is transmitted and a closed state in which light incident on the left eye is blocked by driving of the drive unit 44. The liquid crystal shutter 45R is driven by the drive unit 44. Thus, an open state in which light incident on the right eye is transmitted and a closed state in which light incident on the right eye is blocked are switched.

FIG. 3 is a block diagram showing the internal configuration of the projector 2.
As shown in FIG. 3, the projector 2 includes an optical engine 10, a control unit 21, an image information input unit 22, a storage unit 23, an image processing unit 24, a reception unit 25, and a demodulation unit 26. ing.

  The optical engine 10 includes a light source device 11 as a light source, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a liquid crystal driving unit 14, and the like. The optical engine 10 corresponds to an image display unit, modulates the light emitted from the light source device 11 with the liquid crystal light valves 12R, 12G, and 12B, projects the light from the projection lens 13, and displays the image on the screen SC or the like. indicate.

  The light source device 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. Has been. The light emitted from the light source device 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), which are the three primary colors of light by a color separation optical system (not shown), After being separated into blue (B) color light components, they are incident on the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal panel includes a pixel region in which a plurality of pixels (not shown) are arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel. When the liquid crystal driving unit 14 applies a driving voltage corresponding to the input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source device 11 is modulated for each color light by passing through the pixel regions of the liquid crystal light valves 12R, 12G, and 12B. The modulated color lights are combined by a color combining optical system (not shown) and then projected from the projection lens 13, and a color image based on the image information is displayed on the screen SC.

  The control unit 21 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data, a ROM (Read Only Memory) that is a nonvolatile memory, and the like, and is stored in the ROM. The operation of the projector 2 is controlled by the CPU operating according to the control program.

  Image information supplied from the computer 1 is input to the image information input unit 22 as an image signal, and the input image information is temporarily stored in a storage unit 23 configured by a RAM or the like.

  The receiving unit 25 is configured by a photo sensor or the like, receives (receives) an infrared synchronization signal transmitted from the synchronization signal transmitting device 3, converts it into an electrical signal, and outputs it to the demodulation unit 26. The demodulator 26 demodulates the received synchronization signal and outputs it to the controller 21. The control unit 21 instructs the image processing unit 24 to perform processing so that the display of the image for the left eye and the display of the image for the right eye are switched in synchronization with the demodulated synchronization signal.

  The image processing unit 24 reads image information for one frame from the storage unit 23 in accordance with the above instruction from the control unit 21, and represents image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B. That is, a process of converting the image information to define the drive voltage applied to each pixel is performed, and the processed image information is output to the liquid crystal drive unit 14. When the liquid crystal drive unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the image processing unit 24, the liquid crystal light valves 12R, 12G, and 12B form images according to the image information, and this An image is projected from the projection lens 13. In this way, the image processing unit 24 performs processing one frame at a time in accordance with an instruction from the control unit 21 so that the left-eye image and the right-eye image are alternately switched in synchronization with the synchronization signal. Is displayed.

Next, the operation of the image display system 100 will be described with reference to a timing chart.
4A and 4B are timing charts for explaining the operation of the image display system 100. FIG. 4A is a diagram showing image information output from the computer 1 to the projector 2, and FIG. 4B is a synchronization signal from the computer 1. The figure which shows the synchronizing signal (reference signal) output to the transmitter 3 is a figure which shows the synchronizing signal transmitted from the synchronizing signal transmitter 3. FIG. Further, (d) is a diagram showing switching of images displayed by the projector 2, (e) is a diagram showing a control signal for opening and closing the left-eye liquid crystal shutter 45L, and (f) is a diagram showing the right eye. It is a figure which shows the control signal which opens and closes the liquid crystal shutter 45R for use.

  As shown in FIG. 4A, the computer 1 gives the projector 2 image information (L1, L2,...) Corresponding to the left-eye image and image information (L1, L2,...) R1, R2,...) Are alternately output. As shown in FIG. 4B, the computer 1 outputs a synchronization signal (reference signal) to the synchronization signal transmission device 3. This synchronization signal has a different waveform pattern (pulse width in the example in the figure) between the timing for displaying the image for the left eye and the timing for displaying the image for the right eye, and any image is displayed. It is possible to identify whether it is timing. Therefore, in this synchronization signal, the waveform pattern corresponding to the image for the left eye and the image for the right eye are substantially the same as the cycle in which the image information for the left eye and the image information for the right eye are switched. The corresponding waveform pattern is repeated alternately.

  As shown in FIG. 4C, the synchronization signal transmission device 3 transmits the synchronization signal input from the computer 1 to the projector 2 and the liquid crystal shutter glasses 4 as an infrared blinking signal. The waveform shown in the figure shows a state before modulation by the modulation unit 33, but the length of the USB cable connecting the computer 1 and the synchronization signal transmission device 3, the processing speed of the synchronization signal transmission device 3, etc. Due to the influence, there is a slight delay with respect to the synchronization signal input from the computer 1.

  As shown in FIG. 4D, the projector 2 displays an image in synchronization with the synchronization signal transmitted from the synchronization signal transmission device 3. Specifically, the left eye image is displayed for one frame in synchronization with the waveform pattern corresponding to the left eye image, and the right eye is synchronized with the waveform pattern corresponding to the right eye image. Only one frame is displayed.

  4E and 4F, the liquid crystal shutter glasses 4 alternately open and close the liquid crystal shutters 45L and 45R in synchronization with the synchronization signal transmitted from the synchronization signal transmission device 3. Here, the drive unit 44 of the liquid crystal shutter glasses 4 opens the liquid crystal shutters 45L and 45R when the control signal from the control unit 43 is H, and closes the liquid crystal shutters 45L and 45R during the L period. Yes. That is, the control unit 43 synchronizes with the synchronization signal (waveform pattern) corresponding to the image for the left eye, opens the liquid crystal shutter 45L for the left eye, and outputs the synchronization signal (waveform pattern for the image for the right eye). ) And the right-eye liquid crystal shutter 45R is opened.

  When the liquid crystal driving unit 14 of the projector 2 drives the liquid crystal light valves 12R, 12G, and 12B to set the light transmittance, that is, to form an image, the pixels arranged in a matrix are sequentially processed one by one. Therefore, when switching from an image for the left (right) eye to an image for the right (left) eye, there is a period in which both the left and right images are mixed in one screen. For this reason, in order to suppress the occurrence of crosstalk in which both the left and right images are recognized by one eye, the liquid crystal shutters 45L and 45R are opened during a period in which the left and right images are not mixed, and the left and right images are displayed. It is desirable to control the opening and closing of the liquid crystal shutters 45L and 45R so that both the liquid crystal shutters 45L and 45R are closed during the mixed period.

  As described above, according to the image display system 100 of the present embodiment, the projector 2 switches between the left-eye image display and the right-eye image display based on the infrared synchronization signal, and the liquid crystal shutter. The glasses 4 drive opening and closing of the liquid crystal shutter 45L for the left eye and the liquid crystal shutter 45R for the right eye based on the infrared synchronization signal. That is, since both the projector 2 and the liquid crystal shutter glasses 4 perform the left / right switching based on the infrared synchronization signal transmitted from the synchronization signal transmission device 3, the image switching in the projector 2 and the liquid crystal in the liquid crystal shutter glasses 4 are performed. It becomes possible to synchronize the driving of the shutters 45L and 45R more accurately, and it is possible to suppress the deterioration of the display quality of the image.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above-described embodiment, an aspect in which an infrared synchronization signal is transmitted and received between the synchronization signal transmission device 3, the projector 2, and the liquid crystal shutter glasses 4 has been described. However, the synchronization signal may be transmitted and received wirelessly. It is not limited to infrared. For example, optical communication other than infrared light may be used, or radio waves may be used.

  In the projector 2 of the above embodiment, the transmissive liquid crystal light valves 12R, 12G, and 12B are used as the light modulators. However, it is also possible to use a reflective light modulator such as a reflective liquid crystal light valve. is there. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  In the above embodiment, the projector 2 is described as an example of the image display device, but the image display device is not limited to the projector 2. For example, it is applied to other image display devices such as a rear projector, a liquid crystal display, a plasma display, a surface-conduction electron-emitter display (SED), an organic EL (Electro Luminescence) display, etc., which are integrally provided with a transmissive screen. Is also possible.

  In the above embodiment, the computer 1 is used as the image supply device. However, the image supply device is not limited to the computer 1, and for example, various image reproduction devices may be used.

  In the above embodiment, the image display device (projector 2) and the image supply device (computer 1) are connected by the DVI interface, but the present invention is not limited to this mode. For example, the connection may be made through an HDMI interface.

  In the above-described embodiment, the image supply apparatus alternately outputs the image information for the left eye and the image information for the right eye in units of frames, but the image information supply method is not limited to this. For example, it is possible to employ a side-by-side method in which image information for the left eye and image information for the right eye are arranged side by side and stored in one frame. In this case, the image display apparatus separates the supplied image information into image information for the left eye and image information for the right eye, and sequentially displays images based on each image information in synchronization with the synchronization signal. That's fine.

  DESCRIPTION OF SYMBOLS 1 ... Computer, 2 ... Projector, 3 ... Synchronous signal transmitter, 4 ... Liquid crystal shutter glasses, 10 ... Optical engine, 11 ... Light source device, 11a ... Light source lamp, 11b ... Reflector, 12R, 12G, 12B ... Liquid crystal light valve, DESCRIPTION OF SYMBOLS 13 ... Projection lens, 14 ... Liquid crystal drive part, 21 ... Control part, 22 ... Image information input part, 23 ... Memory | storage part, 24 ... Image processing part, 25 ... Reception part, 26 ... Demodulation part, 31 ... Input part, 32 Control unit, 33 Modulation unit, 34 Transmission unit, 41 Reception unit, 42 Demodulation unit, 43 Control unit, 44 Drive unit, 45L Liquid crystal shutter for left eye, 45R Liquid crystal for right eye Shutter, 100 ... image display system.

Claims (8)

Based on image information supplied from the image supply device, an image display device that alternately displays an image for the left eye and an image for the right eye, and the image for the left eye and the image for the right eye An image display system including a synchronization signal transmission device that wirelessly transmits a synchronization signal for synchronization with switching, and shutter glasses that alternately open a shutter for the left eye and a shutter for the right eye,
The shutter glasses are
A receiver for receiving the synchronization signal transmitted from the synchronization signal transmitter;
A drive unit that drives opening and closing of the shutter for the left eye and the shutter for the right eye based on the synchronization signal received by the reception unit;
The image display device includes:
An image information input unit to which image information is input from the image supply device;
An image display unit for displaying an image based on the image information;
A receiver for receiving the synchronization signal transmitted from the synchronization signal transmitter;
A control unit that switches between the display of the image for the left eye and the display of the image for the right eye based on the synchronization signal received by the reception unit;
An image display system comprising: The image display system according to claim 1,
The image display system, wherein the synchronization signal transmitting device transmits the synchronization signal as an infrared signal. The image display system according to claim 1 or 2,
The image display system, wherein the image display device is a projector. The image display system according to any one of claims 1 to 3,
The image display device is connected to the image supply device via a DVI interface or an HDMI interface. The image display system according to any one of claims 1 to 4,
The synchronization signal transmitting device receives a reference signal from the image supply device and wirelessly transmits the synchronization signal based on the reference signal. The image display system according to claim 5,
The image display system, wherein the reference signal is input to the synchronization signal transmission device from the image supply device via a USB interface. An image display device that alternately displays a left-eye image and a right-eye image based on image information supplied from an image supply device,
An image information input unit to which image information is input from the image supply device;
An image display unit for displaying an image based on the image information;
A receiver for receiving a synchronization signal transmitted wirelessly;
A control unit that switches between the display of the image for the left eye and the display of the image for the right eye based on the synchronization signal received by the reception unit;
An image display device comprising: Based on image information supplied from the image supply device, an image display device that alternately displays an image for the left eye and an image for the right eye, and the image for the left eye and the image for the right eye A control method for an image display system, comprising: a synchronization signal transmitting device that wirelessly transmits a synchronization signal for synchronizing with switching; and shutter glasses that alternately open a shutter for the left eye and a shutter for the right eye. And
A transmission step in which the synchronization signal transmitting device wirelessly transmits a synchronization signal for synchronizing with switching between the image for the left eye and the image for the right eye;
A display switching step in which the image display device receives the synchronization signal and switches between the display of the image for the left eye and the display of the image for the right eye based on the synchronization signal;
A shutter driving step in which the shutter glasses receive the synchronization signal, and drive the opening and closing of the shutter for the left eye and the shutter for the right eye based on the synchronization signal;
An image display system control method comprising:

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