JP5229466B2 - 3D image display system and 3D image display method - Google Patents

Description

  The present invention relates to a stereoscopic video display system and a stereoscopic video display method applicable to a time-division twin-lens stereoscopic display system that displays 3D stereoscopic video using shutter glasses. Specifically, the display device transmits control information for opening / closing the shutter as an RF signal from the transmitter, and the shutter glasses open / close the left and right shutters based on the control information for opening / closing the shutter of the RF signal. The shutter opening / closing timing can be adjusted accordingly, and a plurality of shutter glasses can be controlled simultaneously.

  In recent years, various types of TVs such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), OLED (Organic light-emitting diode), and CRT (CRT) have been commercialized. There are various display methods such as a hold method, a half-hold method, and an impulse method. Furthermore, the resolution and frame rate of the video format are also diversifying.

  When performing time-division twin-lens display using these display devices and video formats, the timing of the liquid crystal shutter glasses needs to be optimized in accordance with the display method and video format of each display device.

  In relation to such a conventional example, Patent Document 1 discloses a method of displaying a stereoscopic image using a hold-type display and glasses with an electronic shutter. According to this 3D image display method, the left and right electronic shutters are temporarily closed simultaneously while the left and right images are mixed on the hold-type display. Thereby, it is possible to prevent the video from crosstalking in the hold type display.

JP 2007-110683 A (6th page, FIG. 3)

  By the way, the stereoscopic video display method of Patent Document 1 according to the conventional example is difficult to cope with various display devices and video formats because the left and right electronic shutter switching timing is fixed. For example, when the display device is an LCD or PDP, the display method is a hold type, and when the display device is a CRT, the display format is an impulse type. For this reason, even if Patent Document 1 can be applied to a hold-type display, it is difficult to apply it to an impulse-type display.

  Further, although the infrared communication method is mainly used as a communication means for timing information between the conventional display device and the shutter glasses, there are the following problems. Infrared rays are limited in the position and orientation of viewers because of the straightness of light, and it is difficult to control glasses worn by a plurality of viewers at the same time. In addition, the distance between the transmitter connected to the display device and the shutter glasses is limited to about several meters. Since the timing is controlled for each frame of the video signal, if communication is interrupted during viewing, shutter control of the shutter glasses becomes difficult.

  Accordingly, the present invention solves the above-described problems, and enables a shutter opening / closing timing to be adjusted according to a display device and a stereoscopic video display system and a stereoscopic video that can simultaneously control a plurality of shutter glasses. An object is to provide a display method.

Stereoscopic image display system according to the present invention includes a display device for outputting control information for shutter opening and displays an image by inputting an image signal, is internal or external to the display device, is output from the display device a transmitter for transmitting the control information for the shutter opening and closing as a RF signal, the shutter glasses this receives RF signals transmitted from the transmitter, to open and close the left and right shutters based on the control information for the shutter opening and closing of the RF signal it is those with a door. The display device includes a first clock generation unit that generates a reference clock having a predetermined frequency, a reference clock input from the first clock generation unit, and a vertical synchronization signal related to a video signal. A counter that obtains a counter value by counting with a reference clock based on the vertical synchronization signal and a storage unit that stores the opening / closing timing of the shutter glasses are provided. The shutter glasses include a left shutter and a right shutter that transmit or block light, a second clock generation unit that generates a reference clock having the same frequency as the reference clock generated by the first clock generation unit, and a vertical synchronization signal. An offset counter for obtaining a counter value from a vertical synchronization signal generation unit to be generated, a vertical synchronization signal output from the vertical synchronization signal generation unit, and a reference clock generated from the second clock generation unit, and the offset counter An arithmetic unit that compares the counter value with the counter value transmitted from the display device to obtain a difference value, and generates a vertical synchronization signal from the difference value obtained by the arithmetic unit and the reference clock from the second clock generation unit A phase adjustment unit that adjusts the phase of the vertical synchronization signal generated by the unit, and a shutter that controls opening and closing of the left shutter and the right shutter. And a drive unit. The counter outputs the counter value and the opening / closing timing of the shutter glasses to the transmitter as the control information for opening / closing the shutter. The shutter driving unit obtains a shutter opening / closing timing based on the vertical synchronization signal generated by the vertical synchronization signal generating unit and the control information for opening / closing the shutter, and determines the left shutter and the right shutter of the shutter glasses based on the shutter opening / closing timing. Open / close drive control.

  According to the stereoscopic video display system according to the present invention, the display device transmits control information for opening and closing the shutter from the transmitter as an RF signal. The shutter glasses receive the RF signal transmitted from the transmitter, and open and close the left and right shutters based on the control information for shutter opening / closing of the RF signal. Accordingly, the shutter opening / closing timing can be adjusted according to the display device, and a plurality of shutter glasses can be simultaneously controlled by the non-directional RF signal.

In the stereoscopic video display method according to the present invention, a first step of displaying a video by inputting a video signal and outputting control information for opening and closing the shutter from the display device, and outputting the control information for opening and closing the shutter to RF a second step of transmitting a (radio frequency) signal, receives the RF signal transmitted, and a third step for opening and closing the left and right shutters of the shutter glasses based on the control information for the shutter opening and closing of the RF signal Is included . The first step includes generating a reference clock having a predetermined frequency, inputting the reference clock, inputting a vertical synchronization signal related to the video signal, and counting with the reference clock based on the vertical synchronization signal. The counter value is obtained, and the opening / closing timing of the shutter glasses is stored. The third step includes a step of generating a reference clock having the same frequency as the reference clock generated in the first step, a step of generating a vertical synchronization signal, a generated vertical synchronization signal and a generated reference clock of the same frequency. From the step of obtaining the counter value, the step of obtaining the difference value by comparing the obtained counter value with the counter value transmitted from the display device, and the obtained difference value and the reference clock having the same frequency are generated. The method includes a step of adjusting the phase of the vertical synchronizing signal and a step of opening / closing driving control of the left shutter and the right shutter that transmit or block light. The counter value and the opening / closing timing of the shutter glasses are output to the transmitter as the shutter opening / closing control information, and the shutter opening / closing timing is obtained based on the generated vertical synchronization signal and the shutter opening / closing control information. Based on the timing, open / close drive control of the left shutter and the right shutter of the shutter glasses is performed.

  According to the stereoscopic video display system and the stereoscopic video display method according to the present invention, the display device transmits control information for opening / closing the shutter from the transmitter to the shutter glasses as an RF signal, and the shutter glasses are for opening / closing the shutter of the RF signal. The left and right shutters are opened and closed based on the control information.

  With this configuration, the shutter opening / closing timing can be adjusted according to the display device, and a plurality of shutter glasses can be simultaneously controlled by a non-directional RF signal. In addition, it is possible to reduce the necessity of providing restrictions on the position and orientation of the viewer wearing the shutter glasses.

  Next, embodiments of a stereoscopic video display system and a stereoscopic video display method according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration example of a time division binocular stereoscopic display system 100 as an embodiment according to the present invention. A time-division binocular stereoscopic display system 100 shown in FIG. 1 realizes a stereoscopic image by viewing the left and right parallax images displayed on the screen of the stereoscopic display device 3 with the liquid crystal shutter glasses 1.

  The time-division twin-lens stereoscopic display system 100 is an example of a stereoscopic video display system, and includes two liquid crystal shutter glasses 1, an RF (radio frequency) transmitter 2, a stereoscopic display device 3, and a video reproduction device 4. For the video playback device 4, for example, a Blu-ray (registered trademark) player capable of playing package media is used. This video reproduction device 4 is connected to a stereoscopic display device 3 which is an example of a display device, reproduces package media content of a Blu-ray (registered trademark) disc, and outputs a video signal Din to the stereoscopic display device 3. The video signal Din is a signal including left-right parallax video alternately with left-eye video, right-eye video, left-eye video, and right-eye video in time series when realizing a three-dimensional stereoscopic video. It is. In addition, the video signal Din includes a vertical synchronization signal (V-Sync) indicating a segment of the video (frame or field).

  As the stereoscopic display device 3, for example, an LCD, a PDP, an OLED, a CRT, or the like is used. The stereoscopic display device 3 displays the video signal Din output from the video playback device 4 on the screen. For example, the stereoscopic display device 3 displays left and right parallax images on the screen alternately with the left-eye video, the right-eye video, the left-eye video, and the right-eye video based on the vertical synchronization signal. In addition, the stereoscopic display device 3 transmits a vertical synchronization signal to the liquid crystal shutter glasses 1 from an RF transmitter 2 which is an example of a transmitter.

  The RF transmitter 2 is built in the stereoscopic display device 3, and transmits information (offset information) such as a vertical synchronization signal and opening / closing timing of the liquid crystal shutter glasses 1 to the liquid crystal shutter glasses 1 from the antenna 2a as an RF signal. The RF transmitter 2 may be provided separately from the stereoscopic display device 3, that is, externally attached.

  The liquid crystal shutter glasses 1 receive the transmitted RF signal and control the opening / closing of the left shutter 1L and the right shutter 1R based on the vertical synchronization signal indicated by the RF signal, the opening / closing timing of the liquid crystal shutter glasses 1, and the like. For example, the liquid crystal shutter glasses 1 turn on the left shutter 1L and turn off the right shutter 1R, then turn off the left shutter 1L and turn on the right shutter 1R, and repeat these operations alternately. The ON / OFF operation of the left shutter 1L and the right shutter 1R of the liquid crystal shutter glasses 1 is performed in synchronization with the vertical synchronization signal of the image.

  For example, when this ON / OFF operation is switched over several tens of times per second, the viewer feels as if he / she is looking with both eyes due to an afterimage. In this way, in the video signal Din composed of left and right parallax images, only the left eye image is input to the viewer's left eye and only the right eye image is input to the right eye, so that a three-dimensional stereoscopic image can be viewed. can do. The liquid crystal shutter glasses 1 are not limited to two, and may be one or two or more.

  FIG. 2 is a schematic diagram illustrating an example of a video signal Din for 3D stereoscopic video. The video signal Din shown in FIG. 2 is composed of left and right parallax images and is output from the video playback device 4. For example, when realizing a three-dimensional stereoscopic video, a right-eye video 1r, a left-eye video 11, a right-eye video 2r, a left-eye video 21, a right-eye video 3r, ... are alternately output in time series. To do.

  3A and 3B are schematic diagrams illustrating an operation example of the time-division binocular stereoscopic display system 100. FIG. In the stereoscopic display device 3 shown in FIG. 3A, the right-eye video 1r output from the video playback device 4 is displayed. At this time, the liquid crystal shutter glasses 1 control to open the right shutter 1R and close the left shutter 1L based on the above-described offset information (an example of shutter opening / closing control information) transmitted from the stereoscopic display device 3. . As a result, the right shutter 1R transmits light and the left shutter 1L blocks light, so that the right eye image 1r reaches the viewer's right eye, but the right eye image 1r reaches the left eye. do not do.

  In the stereoscopic display device 3 shown in FIG. 3B, the left-eye video 11 output from the video playback device 4 is displayed. At this time, the liquid crystal shutter glasses 1 control to open the left shutter 1L and close the right shutter 1R based on the offset information transmitted from the stereoscopic display device 3. As a result, the left shutter 1L transmits light and the right shutter 1R blocks light, so that the left eye image 11 reaches the viewer's left eye, but the left eye image 11 reaches the right eye. do not do.

  Next, offset information will be described. Table 1 is an example of offset information. This offset information includes “vertical synchronization frequency”, “right shutter opening timing (R-open)”, “right shutter closing timing (R-close)”, “left shutter opening timing (L-open)”, “left shutter”. “Close timing (L-close)” and “V-Sync offset” items (fields).

  The “vertical synchronization frequency” shown in Table 1 indicates a vertical synchronization signal indicating a frame or field delimiter forming the left-eye video and the right-eye video. “Right shutter opening timing (R-open)” indicates the opening timing of the right shutter 1R with reference to the vertical synchronization signal by the number of reference clocks. The shutter timing according to the display method characteristics of the stereoscopic display device 3 is set. The stereoscopic display device 3 instructs the liquid crystal shutter glasses 1.

  “Right shutter closing timing (R-close)” indicates the closing timing of the right shutter based on the right shutter opening timing (R-open) by the number of reference clocks. The stereoscopic display device 3 instructs the liquid crystal shutter glasses 1 to set the shutter timing according to the display method characteristics of the stereoscopic display device 3.

  “Left shutter opening timing (L-open)” indicates the opening timing of the left shutter based on the vertical synchronization signal by the number of reference clocks. The stereoscopic display device 3 instructs the liquid crystal shutter glasses 1 to set the shutter timing according to the display method characteristics of the stereoscopic display device 3.

  “Left shutter closing timing (L-close)” indicates the closing timing of the left shutter based on the left shutter opening timing (L-open) by the number of reference clocks. The stereoscopic display device 3 instructs the shutter glasses on the shutter timing in accordance with the display method characteristics of the stereoscopic display device 3.

  “V-Sync offset” indicates a counter value at the reference clock from the most recent vertical synchronization signal generation. In the stereoscopic display device 3, the counter value of “offset information” at the time when the field storing the counter value is sent as a bit string by the wireless module 2 b (see FIG. 6) is shown. Either the right frame or the left frame is used as a reference. As shown in Table 1 above, the offset information transmitted from the RF transmitter 2 of the stereoscopic display device 3 to the liquid crystal shutter glasses 1 is configured as described above.

  Next, a method for transmitting offset information will be described. FIG. 4 is a sequence chart for transmitting offset information by the beacon method. The RF transmitter 2 shown in FIG. 4 broadcasts a beacon signal to which offset information is added at regular intervals of 100 msec, for example, to each of the liquid crystal shutter glasses 1. The liquid crystal shutter glasses 1 intermittently receive this beacon signal as necessary (for example, at intervals of several seconds to several tens of seconds), and based on the offset information, synchronize with the vertical synchronization signal (V-Sync). Correct it. Thus, since the liquid crystal shutter glasses 1 receive the beacon signal intermittently, it is possible to reduce the power consumption associated with the wireless communication compared to the case where the beacon signal is always received.

  FIG. 5 is a sequence chart for transmitting offset information by a request method. Each of the liquid crystal shutter glasses 1 shown in FIG. 5 transmits a V-Sync request packet to the RF transmitter 2 of the stereoscopic display device 3 in order to request synchronization control. After receiving the V-Sync request packet, the stereoscopic display device 3 sets, for example, the counter value (offset value) of the latest V-Sync-L as the “V-Sync offset” of the offset information shown in Table 1 to set the V-Sync request packet. It transmits to the liquid crystal shutter glasses 1 as a Sync response packet.

  The liquid crystal shutter glasses 1 perform synchronization control based on the offset value of the V-Sync-L of the received V-Sync response packet. The liquid crystal shutter glasses 1 make a request again if the V-Sync response packet does not arrive from the RF transmitter 2 after waiting for a certain period after transmitting the V-Sync request packet to the RF transmitter 2. The liquid crystal shutter glasses 1 transmit an Ack packet to the RF transmitter 2 of the stereoscopic display device 3 when acquiring the V-Sync counter value of the V-Sync response packet.

  The stereoscopic display device 3 receives the Ack packet from the liquid crystal shutter glasses 1 and determines that the V-Sync offset value has been transmitted normally. Further, when the stereoscopic display device 3 does not receive the Ack packet from the liquid crystal shutter glasses 1, the stereoscopic display device 3 determines that the V-Sync counter value is not normally transmitted, re-reads the V-Sync counter value, and determines the V-Sync counter value. A Sync response packet is retransmitted from the RF transmitter 2.

  The request method shown in FIG. 5 is particularly effective when the liquid crystal shutter glasses 1 predict the amount of synchronization shift and request offset information from the RF transmitter 2 of the stereoscopic display device 3 at a necessary timing. That is, although the request interval of the liquid crystal shutter glasses 1 is arbitrary, the synchronization is considered from the clock accuracy, and the request is transmitted and corrected before the synchronization deviation becomes large.

  The liquid crystal shutter glasses 1 predict the progress of the synchronization shift from the amount of synchronization shift at the time of past update of the interval for correcting the synchronization timing based on the offset information. For example, if it is determined that the update is performed when the synchronization shift amount exceeds 1 msec, the next update timing is obtained by the following equations (1) and (2).

  In this example, when the previous amount of synchronization deviation (counter value difference) increases, the amount of synchronization deviation per clock increases by equation (1). At this time, the next update timing (number of clocks) is shortened by the equation (2). Therefore, the synchronization shift can be corrected before the synchronization shift amount increases.

  FIG. 6 is a block diagram illustrating a configuration example of the RF transmission system of the stereoscopic display device 3. The stereoscopic display device 3 illustrated in FIG. 6 includes a ZigBee (registered trademark) wireless module 2b, a counter 2c, and a clock generator 2d.

  The clock generator 2d is an example of a first clock generator and generates a reference clock having a predetermined frequency. The counter 2c receives a reference clock from the clock generator 2d. Further, the counter 2c inputs V-Sync from the video reproduction device 4. The counter 2c obtains a counter value by counting with a reference clock with reference to V-Sync (V-Sync of either the right or left frame). For example, when the offset information is transmitted from the wireless module 2b of the RF transmitter 2 to the liquid crystal shutter glasses 1, the counter 2c counts the number of reference clocks advanced from V-Sync of the most recent left frame as a counter value. . The counter 2c outputs this counter value to the wireless module 2b.

  In addition, the counter 2c includes “right shutter opening timing (R-open)”, “right shutter closing timing (R-close)”, “left shutter opening timing (L-open)”, and “left shutter closing timing (L-open)”. close) "is read from a register (an example of a storage unit) (not shown) and output to the wireless module 2b.

  The wireless module 2b is an example of a first wireless unit, and includes an MPU (Micro Processing Unit) 2e, a MAC layer 2f, a switch 2g, and a physical layer (PHY) 2h. In the MPU 2e, an application protocol standardized by ZigBee (registered trademark) is stacked. The MAC layer 2f conforms to the IEEE (Institute of Electrical and Electronics Engineers) 802.15.4 standard and defines a data transmission / reception method, format, error detection method, and the like. The physical layer 2h conforms to the IEEE802.15.4 standard, and defines physical connection and transmission methods such as a cable connector shape.

  The switch 2g is an example of a first switch, and is installed and connected between the MAC layer 2f and the physical layer 2h, and further connected to the counter 2c. The switch 2g switches the communication path to the physical layer 2h or the MAC layer 2f. For example, the switch 2g switches so that the offset information output from the counter 2c is output to the physical layer 2h. Thus, since the external counter 2c directly outputs the offset information to the physical layer 2h of the wireless module 2b, transmission can be performed with a lower delay than when offset information is output to the MPU 2e.

  Further, the switch 2g switches so as to output a signal received via the antenna 2a to the MAC layer 2f. In addition, the switch 2g switches so that the signal output from the MAC layer 2f is output to the physical layer 2h.

  In the physical layer 2h, the offset information input from the counter 2c is set, for example, in the payload of the beacon frame. Thereafter, the beacon frame is broadcast from the antenna 2a in the physical layer 2h.

  In general, in a wireless system, communication is realized by storing a data frame in a memory and passing the data layer in order from the protocol upper layer to the application layer, the MAC layer, and the physical layer. In the wireless method, there is a high possibility that a transmission waiting state will occur depending on radio wave conditions, and when data is transmitted in order from the protocol upper layer, there is a high probability that data with invalid offset information will be transmitted.

  In the present invention, in the transmission of offset information by the RF transmitter 2 of the stereoscopic display device 3, there is no waiting state in the protocol. When the data bit is transferred from the MAC layer 2f to the physical layer 2h when the transmission start is confirmed, the offset information is directly transferred from the counter 2c, which is an external circuit, to the physical layer 2h. Thereby, it is possible to transmit the offset information at the time of transmission to the liquid crystal shutter glasses 1 with a minimum delay.

  FIG. 7 is a block diagram illustrating a configuration example of the liquid crystal shutter glasses 1. The liquid crystal shutter glasses 1 shown in FIG. 7 include an antenna 1a, a ZigBee (registered trademark) wireless module 1b, an offset counter 1d, a PLL circuit 1e, a V-Sync generation counter 1f, a clock generation unit 1g, and a shutter drive unit 1h. .

  The ZigBee (registered trademark) wireless module 1b is an example of a second wireless unit, and includes an MPU 1i, a MAC layer 1j, a switch 1k, and a physical layer (PHY) 1m. The MPU 1i is stacked with an application protocol standardized by ZigBee (registered trademark). The MAC layer 1j conforms to the IEEE802.15.4 standard and defines a data transmission / reception method, format, error detection method, and the like. The physical layer 1m conforms to the IEEE802.15.4 standard and defines the physical connection and transmission method such as the connector shape of the cable.

  In the physical layer 1m, the offset information received via the antenna 1a is acquired from the payload of the beacon frame, for example. Thereafter, the offset information acquired in the physical layer 1m is output to the switch 1k.

  The switch 1k is an example of a second switch, and is installed and connected between the MAC layer 1j and the physical layer 1m, and is further connected to the computing unit 1c. The switch 1k switches the communication path to the MAC layer 1j or the calculator 1c. For example, the switching device 1k switches so that the offset information output from the physical layer 1m via the antenna 1a is output to the computing device 1c. Further, the switch 1k switches so as to output a signal received via the antenna 1a to the MAC layer 1j. Further, the switch 1k switches so that the signal output from the MAC layer 1j is output to the physical layer 1m.

  The offset counter 1d receives a reference clock having a predetermined frequency from a clock generator 1g which is an example of a second clock generator. Further, the offset counter 1d receives V-Sync (vertical synchronization signal) from the V-Sync generation counter 1f. The offset counter 1d obtains a counter value from this V-Sync and the reference clock and outputs it to the computing unit 1c. The clock generator 2d shown in FIG. 6 and the clock generator 1g shown in FIG. 7 output a reference clock having the same frequency.

  The computing unit 1c compares the “V-Sync offset” counter value (the counter value included in the beacon) of the offset information received by the wireless module 1b with the free-running counter value output from the offset counter 1d. The difference value is obtained and output to the PLL circuit 1e.

  The PLL circuit 1e is an example of a phase adjustment unit, and the difference value is input from the arithmetic unit 1c and the reference clock is input from the clock generation unit 1g. The PLL circuit 1e inputs a beacon reception completion notification IRQ indicating an interrupt request from the MAC layer 1j of the wireless module 1b, and then adjusts the phase of V-Sync from the difference value and the reference clock.

  The V-Sync generation counter 1f is an example of a vertical synchronization signal generation unit, and after receiving a beacon reception completion notification IRQ indicating an interrupt request from the MAC layer 1j of the wireless module 1b, the phase of the V-Sync generation counter 1f is adjusted by the PLL circuit 1e. -Sync is input to generate V-Sync based on the V-Sync. The V-Sync generation counter 1f outputs the generated V-Sync to the shutter drive unit 1h.

  The shutter drive unit 1h obtains opening / closing timings of the left shutter 1L and the right shutter 1R based on the V-Sync and the offset information shown in Table 1. The shutter drive unit 1h controls opening / closing drive of the left shutter 1L and the right shutter 1R of the liquid crystal shutter glasses 1 based on the opening / closing timing.

  8A to 8D are timing charts showing an example of opening / closing timings of the right shutter 1R and the left shutter 1L. FIG. 8A shows the video signal Din. For example, “R” of the video signal Din is the right-eye video 1r, and “L” of the video signal Din is the left-eye video 1l. FIG. 8B shows the vertical synchronization signal.

  FIG. 8C shows the opening / closing timing of the right shutter 1 </ b> R of the liquid crystal shutter glasses 1. The right shutter opening timing “R-open” shown in FIG. 8C indicates the opening timing of the right shutter 1R based on the vertical synchronization signal by the number of reference clocks. The right shutter closing timing “R-close” indicates the closing timing of the right shutter based on the right shutter opening timing “R-open” by the number of reference clocks. “T1” illustrated in FIG. 8C is an open response time of the right shutter 1R of the liquid crystal shutter glasses 1. “T2” is the closing response time of the right shutter 1R of the liquid crystal shutter glasses 1. The opening response time “T1” and the closing response time “T2” are held by the liquid crystal shutter glasses 1 as internal parameters. The right shutter opening timing “R-open” and the right shutter closing timing “R-close” are transmitted from the stereoscopic display device 3 as offset information shown in Table 1.

  The V-Sync generation counter 1f shown in FIG. 7 generates V-Sync based on the V-Sync whose phase is adjusted by the PLL circuit 1e, and outputs it to the shutter drive unit 1h. The shutter drive unit 1h obtains the opening / closing timing of the right shutter 1R based on V-Sync and offset information “R-open” and “R-close”, and the right shutter 1R of the liquid crystal shutter glasses 1 based on the opening / closing timing. Open / close drive control.

  FIG. 8D shows the opening / closing timing of the left shutter 1 </ b> L of the liquid crystal shutter glasses 1. The left shutter opening timing “L-open” shown in FIG. 8D indicates the opening timing of the left shutter 1L based on the vertical synchronization signal by the number of reference clocks. The left shutter closing timing “L-close” indicates the closing timing of the left shutter based on the left shutter opening timing “L-open” by the number of reference clocks. “T1” illustrated in FIG. 8D is an open response time of the left shutter 1L of the liquid crystal shutter glasses 1. “T2” is the closing response time of the left shutter 1L of the liquid crystal shutter glasses 1. The opening response time “T1” and the closing response time “T2” are held by the liquid crystal shutter glasses 1 as internal parameters. The left shutter opening timing “L-open” and the left shutter closing timing “L-close” are transmitted from the stereoscopic display device 3 as the offset information shown in Table 1.

  The shutter drive unit 1h obtains the opening / closing timing of the left shutter 1L based on V-Sync and offset information “L-open” and “L-close”, and the left shutter 1L of the liquid crystal shutter glasses 1 based on the opening / closing timing. Open / close drive control. Thus, since the right shutter 1R and the left shutter 1L are driven in accordance with the opening / closing timing according to the characteristics of the stereoscopic display device 3 and the liquid crystal shutter glasses 1, it is possible to prevent image crosstalk.

  FIG. 9 is a flowchart illustrating an operation example of the stereoscopic display device 3. In step ST1 shown in FIG. 9, the stereoscopic display device 3 starts preparation for transmission of a beacon signal and proceeds to step ST2. In step ST2, the radio module 2b of the RF transmitter 2 determines whether an interrupt request has occurred. If an interrupt request is generated, the process proceeds to step ST3.

  In step ST3, the stereoscopic display device 3 generates a beacon frame. For example, the counter 2c shown in FIG. 6 includes “right shutter opening timing (R-open)”, “right shutter closing timing (R-close)”, “left shutter opening timing (L-open)”, and “left shutter”. "Close timing (L-close)" is read from a register (not shown) and output to the wireless module 2b as offset information. The counter 2c outputs the counter value at the reference clock from the most recent vertical synchronization signal generation to the wireless module 2b as offset information.

  The radio module 2b sets these offset information in the payload of the beacon frame in the physical layer 2h, and proceeds to step ST4. In step ST4, the wireless module 2b broadcasts this beacon frame as an RF signal and ends transmission.

  FIG. 10 is a flowchart showing an operation example of the liquid crystal shutter glasses 1. In step ST11 shown in FIG. 10, the wireless module 1b of the liquid crystal shutter glasses 1 receives the RF signal of the beacon frame transmitted from the stereoscopic display device 3, and proceeds to step ST12. In step ST12, the wireless module 1b determines whether an interrupt request has occurred. If an interrupt request is generated, the process proceeds to step ST13. In step ST13, the radio module 1b acquires offset information set in the payload of the beacon frame in the physical layer 1m, and proceeds to step ST14.

  In step ST14, the calculator 1c shown in FIG. 7 calculates a difference value between the internal counter value and the counter value indicated by the offset information. For example, the computing unit 1c compares the counter value of “V-Sync offset” of the offset information (the counter value included in the beacon) with the self-running counter value output from the offset counter 1d, and calculates the difference value. Obtained and output to the PLL circuit 1e. The PLL circuit 1e adjusts the phase of V-Sync from the difference value and the reference clock.

  The V-Sync generation counter 1f generates a phase-adjusted V-Sync and outputs it to the shutter drive unit 1h. The shutter drive unit 1h obtains opening / closing timings of the left shutter 1L and the right shutter 1R based on the V-Sync and the offset information shown in Table 1. The shutter drive unit 1h controls opening / closing drive of the left shutter 1L and the right shutter 1R of the liquid crystal shutter glasses 1 based on the opening / closing timing. Subsequently, the process proceeds to step ST15.

  In step ST15, the MPU 1i sets a watchdog timer to interrupt the step ST12 at the next scheduled beacon reception time, and proceeds to step ST16. In step ST16, the wireless module 1b is turned off and the process is terminated.

  As described above, according to the time-division twin-lens stereoscopic display system 100 and the display method thereof according to the present invention, the stereoscopic display device 3 transmits offset information from the RF transmitter 2 to the liquid crystal shutter glasses 1 as an RF signal. 1 opens and closes the left shutter 1L and the right shutter 1R based on the offset information of the RF signal.

  With this configuration, the shutter opening / closing timing can be adjusted according to the stereoscopic display device 3, and a plurality of liquid crystal shutter glasses 1 can be simultaneously controlled by a non-directional RF signal. In addition, it is possible to reduce the necessity of providing restrictions on the position and orientation of the viewer wearing the liquid crystal shutter glasses 1.

  Further, by using an RF signal compliant with ZigBee (registered trademark), the communication range can be covered up to several tens of meters. Further, since the liquid crystal shutter glasses 1 generate the vertical synchronization signal by the self-propelled type by the V-Sync generation counter 1f, the liquid crystal shutter glasses 1 are hardly affected by the interference radio waves leaking from the microwave oven or the like.

  The present invention is extremely suitable when applied to a time-division twin-lens display system that displays 3D stereoscopic images using shutter glasses.

1 is a schematic diagram illustrating a configuration example of a time-division binocular stereoscopic display system 100 as an embodiment according to the present invention. It is the schematic which shows an example of the video signal Din for 3D stereoscopic images. A and B are schematic diagrams illustrating an operation example of the time-division binocular stereoscopic display system 100. It is a sequence chart which transmits offset information by a beacon system. It is a sequence chart which transmits offset information by a request system. 4 is a block diagram illustrating a configuration example of an RF transmission system of the stereoscopic display device 3. FIG. 2 is a block diagram illustrating a configuration example of liquid crystal shutter glasses 1. FIG. A to D are timing charts showing an example of opening and closing timings of the right shutter 1R and the left shutter 1L. 10 is a flowchart illustrating an operation example of the RF transmitter 2 of the stereoscopic display device 3. 4 is a flowchart illustrating an operation example of the liquid crystal shutter glasses 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal shutter glasses (shutter glasses), 1b ... Wireless module (2nd wireless part), 1c ... Calculator, 1d ... Offset counter, 1e ... PLL circuit (Phase adjustment part) ), 1f... Generation counter (vertical synchronization signal generation unit), 1g... Clock generation unit (second clock generation unit), 1h... Shutter release unit, 1k. 1L ... left shutter, 1R ... right shutter, 2 ... RF transmitter (transmitter), 2b ... wireless module (first wireless unit), 2c ... counter, 2d ... Clock generator (first clock generator), 2g ... Switch (first switch), 3 ... 3D display device (display device)

Claims (5)

A display device for inputting a video signal to display a video and outputting control information for opening and closing the shutter;
A transmitter that is built in or externally attached to the display device, and that transmits the shutter opening / closing control information output from the display device as an RF (radio frequency) signal;
Shutter glasses that receive the RF signal transmitted from the transmitter and open and close left and right shutters based on control information for shutter opening and closing of the RF signal ;
The display device
A first clock generator for generating a reference clock having a predetermined frequency;
A counter that receives the reference clock from the first clock generation unit and inputs a vertical synchronization signal related to the video signal, and obtains a counter value by counting with the reference clock based on the vertical synchronization signal;
A storage unit for storing opening / closing timing of the shutter glasses;
With
The shutter glasses are
A left shutter and a right shutter that transmit or block light; and
A second clock generator for generating a reference clock having the same frequency as the reference clock generated by the first clock generator;
A vertical synchronization signal generator for generating the vertical synchronization signal;
An offset counter for obtaining a counter value from the vertical synchronization signal output from the vertical synchronization signal generation unit and the reference clock generated from the second clock generation unit;
A computing unit that compares the counter value obtained by the offset counter with the counter value transmitted from the display device to obtain a difference value;
A phase adjustment unit that adjusts a phase of a vertical synchronization signal generated by the vertical synchronization signal generation unit from a difference value obtained by the arithmetic unit and a reference clock from the second clock generation unit;
A shutter driving unit that controls opening and closing of the left shutter and the right shutter;
With
The counter outputs the counter value and the opening / closing timing of the shutter glasses to the transmitter as control information for opening / closing the shutter,
The shutter driving unit obtains a shutter opening / closing timing based on the vertical synchronization signal generated by the vertical synchronization signal generating unit and the control information for opening / closing the shutter, and based on the shutter opening / closing timing, A stereoscopic image display system that controls opening and closing of the right shutter . The transmitter includes a first radio unit;
The first wireless unit has a first switch connected is installed between the MAC layer and the physical layer,
The counter outputs control information for opening and closing the shutter to the first switch;
The stereoscopic video display system according to claim 1 , wherein the first switcher switches so as to output the shutter opening / closing control information output from the counter to the physical layer. The shutter glasses include a second wireless unit that receives the RF signal,
The second radio unit has a second switch connected is installed between the MAC layer and the physical layer,
It said second switch is a stereoscopic image display system according to claim 1 or claim 2 switches the control information for the shutter opening and closing outputted from the physical layer to output to the calculator. The second radio unit sets the power of the second radio unit to OFF by setting a timer for receiving an interrupt, according to claim 3 for intermittently receiving the control information for the shutter opening and closing 3D image display system. A first step of inputting a video signal to display a video and outputting control information for opening and closing the shutter from the display device;
A second step of transmitting the output control information for opening and closing the shutter as an RF (radio frequency) signal;
Receiving the RF signal transmitted, and a third step for opening and closing the left and right shutters of the shutter glasses based on the control information for the shutter opening and closing of the RF signal,
The first step includes
Generating a reference clock of a predetermined frequency;
Inputting the reference clock and inputting a vertical synchronization signal related to the video signal, and obtaining a counter value by counting with the reference clock based on the vertical synchronization signal;
Storing opening / closing timing of the shutter glasses;
Including
The third step includes
Generating a reference clock having the same frequency as the reference clock generated in the first step;
Generating the vertical synchronization signal;
Obtaining a counter value from the generated vertical synchronization signal and the generated reference clock of the same frequency;
Comparing the obtained counter value with the counter value transmitted from the display device to obtain a difference value;
Adjusting the phase of the vertical synchronization signal to be generated from the obtained difference value and the reference clock of the same frequency;
Controlling the opening and closing of the left and right shutters that transmit or block light; and
Including
The counter value and the opening / closing timing of the shutter glasses are output to the transmitter as control information for opening / closing the shutter,
A stereoscopic image display method for obtaining a shutter opening / closing timing based on the generated vertical synchronization signal and the control information for opening / closing the shutter, and controlling opening / closing driving of the left shutter and the right shutter of the shutter glasses based on the shutter opening / closing timing .