WO2011152451A1 - Display device executing time-shared driving, shutter device, and display system - Google Patents

Display device executing time-shared driving, shutter device, and display system Download PDF

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Publication number
WO2011152451A1
WO2011152451A1 PCT/JP2011/062591 JP2011062591W WO2011152451A1 WO 2011152451 A1 WO2011152451 A1 WO 2011152451A1 JP 2011062591 W JP2011062591 W JP 2011062591W WO 2011152451 A1 WO2011152451 A1 WO 2011152451A1
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Prior art keywords
liquid crystal
shutter
unit
eye
signal
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PCT/JP2011/062591
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French (fr)
Japanese (ja)
Inventor
悟郎 清水
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シャープ株式会社
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Priority to JP2010125896 priority Critical
Priority to JP2010-125896 priority
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2011152451A1 publication Critical patent/WO2011152451A1/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B30/00Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/332Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/398Synchronisation thereof; Control thereof

Abstract

Disclosed is a three dimensional display system provided with a liquid crystal display device (10) and a liquid crystal shutter device (spectacles) (30), the system comprising: a liquid crystal display unit (20) which displays an image; a spatial position measurement unit (21) which measures the relative position of the liquid crystal shutter device (spectacles) (30) with respect to the device itself; a computation unit (13) which calculates the timing of the opening and closing of the shutters of the liquid crystal shutter device (spectacles)(30) on the basis of the relative position; and a signal transmission unit (22) which transmits the timing of the opening and closing of the shutters to the liquid crystal shutter device (spectacles) (30). The liquid crystal shutter device (spectacles) (30) comprises a signal receiver unit (31), a control signal generation unit (35), a left-eye liquid crystal module (40L), and a right-eye liquid crystal module (40R). Consequently the crosstalk occurring between the left-eye video image (L) and the right-eye video image (R) can be avoided.

Description

Display device, shutter device, and display system performing time-division driving

The present invention relates to a display device, a shutter device, and a display system that are time-division driven.
This application claims priority based on Japanese Patent Application No. 2010-125896 filed in Japan on June 1, 2010, the contents of which are incorporated herein by reference.

Conventionally, a stereoscopic display method using a liquid crystal panel as an optical shutter has been proposed. In this stereoscopic display method, a left-eye image and a right-eye image in a scanning display device (for example, a CRT display or a liquid crystal display) are alternately displayed by time-sharing with an optical shutter, and these are visually recognized by the left eye and the right eye, respectively. This makes it possible to visually recognize a stereoscopic image.

In general, when performing active shutter 3D display using a hold-type display element such as a liquid crystal panel as the liquid crystal shutter on the glasses side, the image of the eye opposite to the image desired for one eye is displayed. A phenomenon called crosstalk occurs. When this symptom occurs, it is known that the display quality deteriorates such that a 3D (dimension) image can be seen doubled or a stereoscopic effect cannot be obtained.

On the other hand, a method of reducing crosstalk by shortening the time during which the liquid crystal shutter on the glasses side is open is disclosed (for example, Patent Document 1 and Patent Document 2). In this case, since the time during which the shutter is open is shortened so that crosstalk does not occur, there is a problem in that the brightness is lost because the total amount of light passing through the shutter is reduced accordingly.

On the other hand, a method of suppressing crosstalk by synchronizing the opening / closing timing and position of the liquid crystal shutter on the glasses side with the display on the image display unit so that only the scanning portion of the output video passes through the shutter is disclosed ( Patent Document 3). By using this method, it is possible to reduce crosstalk while suppressing loss of brightness.

JP 2000-4451 A JP 2000-284223 A JP 2009-31524 A

However, when the technique of Patent Document 3 is used, there is a problem that crosstalk occurs unless the start position and timing of opening the shutter of the liquid crystal shutter on the glasses side are appropriately set. However, there is no disclosure of how to calculate the start position and timing of opening the shutter of the liquid crystal shutter on the glasses side.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a display device, a shutter device, and a display system that perform time-division driving that can avoid the occurrence of the crosstalk. It is.

(1) A display device that performs time-division driving according to the present invention has been made in view of the above circumstances, a display unit that displays an image, and a spatial position measurement unit that measures a relative position of the shutter device with respect to the device itself. And a calculating unit that calculates a shutter opening / closing timing of the shutter device based on the relative position.

(2) In the display device that performs time-division driving according to (1), the display device includes a signal transmission unit that transmits the shutter opening / closing timing to the shutter device.

(3) In the display device that performs time-division driving according to (2), the calculation unit is configured to display a timing at which the display unit displays an image based on the shutter opening / closing timing, and the shutter device uses light of the liquid crystal. A synchronization signal is generated to synchronize with the timing of changing the transparency of the signal, and the signal transmission unit transmits the synchronization signal to the shutter device.

(4) The shutter device of the present invention has been made in view of the above circumstances, and based on the relative position of the device relative to the panel unit that changes the light transmittance and the display device that performs time-division driving. And a control signal generation unit that generates a control signal for controlling the opening / closing timing of the display.

(5) In the shutter device described in (4), a position measuring unit that measures the relative position is provided.

(6) The shutter device according to (4), further comprising a signal receiving unit that receives the relative position.

(7) The display system of the present invention has been made in view of the above circumstances, and includes a display device that performs time-division driving and a shutter device, and the display device that performs time-division driving displays an image. A display unit, a spatial position measurement unit that measures a relative position of the shutter device with respect to the own device, and a calculation unit that calculates a shutter opening / closing timing of the shutter device based on the relative position. Features.

(8) The display system of the present invention has been made in view of the above circumstances, and includes a display device that performs time-division driving, and a shutter device, and the shutter device includes a panel unit that changes light transmittance; And a control signal generation unit that generates a control signal for controlling the opening / closing timing of the shutter based on the relative position of the device with respect to the display device.

According to the present invention, occurrence of crosstalk can be avoided.

1 is a schematic block diagram of a display system according to an embodiment of the present invention. 1 is a schematic block diagram of a liquid crystal display device according to an embodiment of the present invention. It is a schematic block diagram of a liquid crystal display part. It is a schematic diagram of the liquid-crystal shutter apparatus by embodiment of this invention. It is a schematic block diagram of the liquid-crystal shutter apparatus by embodiment of this invention. It is a figure for demonstrating the relationship between the video scanning timing of a liquid crystal display device, and the opening / closing timing of a liquid-crystal shutter apparatus. It is a figure for demonstrating the position of the upper end of the area | region which changes the transmittance | permeability of the liquid crystal of a liquid-crystal shutter apparatus at any time, and the position of a lower end. It is the figure which showed the scanning position which closes the shutter on a liquid-crystal shutter apparatus (glasses), when the image displayed on the liquid crystal display device 10 switches from the image for left eyes to the image for right eyes with a scan. The figure which showed the video display timing of a liquid crystal display device, the shutter opening / closing timing of a liquid-crystal shutter device, the timing of the output signal of the timing control part 41L for left eyes, and the timing of the output signal of the timing control part 41L for left eyes expanded It is. It is the figure which showed the scanning timing of the vertical direction of a liquid crystal display device and a liquid-crystal shutter apparatus (glasses). It is the flowchart which showed the flow of the process of a liquid crystal display device. It is the flowchart which showed the flow of the process of a liquid-crystal shutter apparatus. It is the figure which showed the scanning timing of the vertical direction of a liquid crystal display device and a liquid-crystal shutter device (glasses) when the distance of a liquid-crystal display device and a liquid-crystal shutter device (glasses) is separated. It is the flowchart which showed the flow of the process which determines whether the position of the liquid-crystal shutter apparatus by a liquid crystal display device is in a control range. It is a figure for demonstrating the method of opening and closing a liquid-crystal shutter in a horizontal direction. It is a figure for demonstrating closing the shutter of the edge of the liquid crystal panel which is a direction perpendicular | vertical to the scanning direction of the liquid crystal panel of glasses using an active matrix system liquid crystal panel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram of a display system according to an embodiment of the present invention. The display system 1 includes a liquid crystal display device (display) 10 and a liquid crystal shutter device (glasses) 30.

The liquid crystal display device (display) 10 calculates the opening / closing timing of the liquid crystal shutter device (glasses) 30 based on the spatial position of the liquid crystal shutter device (glasses) 30. The liquid crystal display device (display) 10 generates a synchronization signal for synchronizing the timing at which the device displays an image and the timing at which the shutter device changes the light transmittance of the liquid crystal. Then, the liquid crystal display device (display) 10 supplies a signal indicating the opening / closing timing and the generated synchronization signal to the liquid crystal shutter device (glasses) 30.

The liquid crystal shutter device (glasses) 30 generates a control signal for opening and closing the liquid crystal shutter based on the supplied signal indicating the opening / closing timing and the synchronization signal. The liquid crystal shutter device (glasses) 30 opens and closes the liquid crystal shutter based on the control signal.

FIG. 2 is a schematic block diagram of the liquid crystal display device according to the first embodiment of the present invention. The liquid crystal display device (display) 10 includes a reception unit 11, an image adjustment unit 12, a calculation unit 13, a timing control unit 14, a liquid crystal display unit 20, a spatial position measurement unit 21, and a signal transmission unit 22. Prepare. The liquid crystal display unit 20 includes a source driver unit 15, a gate driver unit 16, and a liquid crystal panel unit 17.

As an example, the receiving unit 11 receives high-frequency signals of a plurality of channels of digital television broadcast supplied from an antenna (not shown). Then, the receiving unit 11 extracts a modulation signal of a desired channel from the received signal, converts the extracted modulation signal into a baseband signal, and converts the converted baseband signal into a digital signal at a predetermined sampling frequency. To do.

The receiving unit 11 extracts a digital data MPEG (Moving Picture Experts Group) -2 transport stream (hereinafter referred to as “MPEG-2TS”) signal from the converted digital signal.

Then, the receiving unit 11 extracts a TS (Transport Stream, transport stream) packet from the MPEG-2 TS signal, and decodes data of the video signal and the audio signal. Then, the reception unit 11 supplies the decoded video signal to the image adjustment unit 12.
The decoded audio signal is amplified as necessary and then supplied to a speaker (not shown).
Here, the video signal includes a luminance signal Y (hereinafter referred to as an input luminance signal) of pixels arranged adjacent to each other in the main scanning direction (horizontal direction and horizontal direction) of the image, a color difference signal Cb, and a color difference signal Cr. Become.

The image adjusting unit 12 receives the video signal supplied from the receiving unit 11. If the image signal from which the noise is removed is an interlace signal, the image adjustment unit 12 converts the image signal into a progressive signal. Further, the image adjustment unit 12 adjusts (scaling processing) the number of pixels in accordance with the resolution of the display unit with respect to the progressive signal. Then, the image adjustment unit 13 supplies the video signal whose image has been adjusted as described above to the calculation unit 13.

The calculation unit 13 supplies the video signal DATA whose image has been adjusted to the source driver unit 15. In addition, the calculation unit 13 generates a vertical synchronization signal VSYNC_D that is a signal for synchronizing the scanning of the video signal in the vertical direction, and supplies the vertical synchronization signal VSYNC_D to the timing control unit 14.

The calculation unit 13 extracts a distance Dd (see FIG. 7) from the liquid crystal panel unit 17 to the liquid crystal shutter of the liquid crystal shutter device (glasses) 30 from the spatial position of the liquid crystal shutter device (glasses) 30 by a method described later. . The calculation unit 13 calculates the height (shutter height) Hs (see FIG. 7) of the portion used as the shutter from the extracted distance Dd.

Then, the calculation unit 13 calculates the vertical position (starting vertical position of the shutter) Ht (see FIG. 7) of the upper end of the area where the liquid crystal shutter is opened (the area where light is transmitted by the liquid crystal) with reference to the upper end of the liquid crystal shutter. . Then, the calculation unit 13 uses the shutter height Hs, the shutter start vertical position Ht, and the video display period TDdisp (see FIG. 9) of the liquid crystal display device 30 to start the shutter start vertical position Ht from the upper end of the liquid crystal shutter. The time (shutter start time) TGstart (see FIG. 9) required to scan up to the height is calculated.

The calculation unit 13 generates a synchronization signal G_CTRL that is a signal for synchronizing with the liquid crystal shutter of the liquid crystal shutter device (glasses) 30 based on the shutter start time TGstart and the vertical synchronization signal VSYNC_D by a method described later. .
Further, the calculation unit 13 uses the height Hg of the entire liquid crystal shutter (see FIG. 7), the shutter height Hs, and the portion (Hs height) used as the shutter of the panel area (Hg height) of the liquid crystal shutter. The total scan time TGdisp (see FIG. 9) including the vertical blanking period of the glasses liquid crystal panel is calculated from the time for scanning (shutter scan time) TGshut (see FIG. 9).

The calculation unit 13 supplies the signal transmission unit 22 with the generated synchronization signal G_CTRL, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scanning time TGdisp.

The timing control unit 14 generates a clock signal for distributing the video data supplied to the liquid crystal panel unit 17 to the pixels on the plane. Then, the timing control unit 14 supplies the generated clock signal to the source driver unit 15 and the gate driver unit 16.

The source driver unit 15 generates a gradation voltage for driving the liquid crystal from the received image-adjusted video signal DATA. The source driver unit 15 holds the gradation voltage for each source line by an internal hold circuit.

The source driver unit 15 receives the clock signal supplied from the timing control unit 14. The source driver unit 15 applies the gradation voltage (source signal) to the TFT line (Thin Film Transistor) of the liquid crystal panel unit 17 in synchronization with the clock signal with respect to the vertical arrangement of the screen. To supply.

The gate driver unit 16 receives the clock signal supplied from the timing control unit 14. The gate driver unit 16 supplies a predetermined gate signal to one row of the sub-pixels on the screen through the TFT gate line of the display unit 17 in synchronization with the clock signal.

The liquid crystal panel unit 17 includes an array substrate, a counter substrate, and a liquid crystal. At each intersection of the gate line and the data line on the array substrate, a pair of a pixel electrode connected to the TFT and a counter electrode is arranged to constitute a pixel, particularly a sub-pixel. Further, sealed liquid crystal exists between the pixel electrode and the counter electrode. The liquid crystal panel unit 17 has three sub-pixels corresponding to three colors RGB (Red, Green, Blue) for each pixel. The liquid crystal panel unit 17 includes one TFT for each subpixel.

The gate electrode of the TFT receives the gate signal supplied from the gate driver unit 16, and when the gate signal is at a high level, for example, the TFT is selected and turned on. The source electrode of the TFT receives the source signal supplied from the source driver 15. As a result, a gradation voltage is applied to the source electrode of the TFT.

The orientation of the liquid crystal changes according to the gradation voltage, thereby changing the light transmittance of the liquid crystal. The gradation voltage is held in the liquid crystal capacitor formed by the liquid crystal portion between the pixel electrode connected to the drain electrode of the TFT and the counter electrode, and the alignment of the liquid crystal is maintained. Since the alignment of the liquid crystal is maintained until the next signal arrives at the source electrode, the light transmittance of the liquid crystal is maintained.

The gradation voltage indicating the video data is sequentially supplied to the source line within the time when each gate line is selected, and the gradation voltage is applied between the pixel electrode and the counter electrode via the TFT. It is held in the liquid crystal capacitor. Thereby, according to the voltage applied to the liquid crystal capacitance, for example, the light transmittance of the liquid crystal between the pixel electrodes and the counter electrode is controlled. As a result, the liquid crystal panel unit 17 displays the supplied video data in gradation.

Although the transmission type liquid crystal panel has been described here, the present invention is not limited to this, and a reflection type liquid crystal panel may be used. In this case, the reflectance of the liquid crystal light between the pixel electrodes and the counter electrode is controlled according to the voltage applied to the liquid crystal capacitance.

The spatial position measurement unit 21 calculates the spatial position of the liquid crystal shutter device (glasses) 30 by known image processing. Specifically, for example, a marker attached to the liquid crystal shutter device (glasses) 30 is photographed by an imaging device on the display side (for example, a CMOS image sensor), and the marker is recognized by a known technique related to pattern recognition, and then known. The spatial position is measured using the triangulation technique. The spatial position measurement unit 21 supplies information on the spatial position to the calculation unit 13.

Note that the spatial position measurement unit 21 captures infrared light (infrared light having a pattern corresponding to the specific position) emitted from a light source arranged at a specific position, and uses the captured infrared light pattern. The spatial position of the liquid crystal shutter device (glasses) 30 may be measured.

The signal transmission unit 22 uses, as an example, a liquid crystal shutter that transmits a synchronization signal G_CTRL, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scanning time TGdisp via infrared communication. It transmits to the signal receiving part 31 of the apparatus (glasses) 30.
Note that the signal transmission unit 22 may transmit via wireless communication using radio waves of a radio frequency, not limited to infrared communication.

In addition, the calculation unit 13 supplies a control signal for controlling to emit a warning sound to the warning signal transmission unit 23 when the controllable condition of the liquid crystal shutter device (glasses) 30 described later is not satisfied.
The warning signal transmission unit 23 outputs a warning sound when receiving the control signal supplied from the calculation unit 13.

FIG. 3 is a schematic block diagram of the liquid crystal display unit 20. The liquid crystal display unit 20 is an active matrix type liquid crystal display device. The liquid crystal display unit 20 drives the liquid crystal panel unit 17 having the pixels PIX arranged in a matrix, the gate wiring 18, the source line 19, the gate driver unit 16 that drives the gate line 18, and the source line 19. A source driver unit 15.

The liquid crystal panel unit 17 has two sub-pixels belonging to the same pixel PIX. The sub-pixel is connected to the same gate line 18 and data line 19 through a TFT as a switching element.

The gate driver unit 16 is controlled by GSP (gate start pulse signal) and GCK (gate clock signal) input from the timing control unit 14, and supplies a scanning signal to the gate of the TFT through the gate wiring 18. The source drive circuit 3 is controlled in timing by SSP (source start pulse signal) and SCK (source clock signal) input from the timing control unit 14, and the video signal input from the image adjustment unit 13 is transferred to the data wiring 19 and the above-described video signal. The pixel PIX is supplied via the TFT.

FIG. 4 is a schematic diagram of a liquid crystal shutter device (glasses) 30 according to an embodiment of the present invention.
The signal receiving unit 31 is a front surface of the liquid crystal shutter device (glasses) 30 in order to receive a signal supplied from the liquid crystal display device 22, and is located between the right-eye liquid crystal panel 44R and the left-eye liquid crystal panel 44L. Is attached. Here, the liquid crystal panel included in the liquid crystal shutter device (glasses) 30 is referred to as a liquid crystal shutter.

In the left-eye liquid crystal panel 44L, the arrow indicates the scanning direction of the screen, and the black region indicates that the light transmittance of the liquid crystal is close to zero. On the other hand, in the left-eye liquid crystal panel 44L, the white region indicates that the light transmittance of the liquid crystal is high. The state where the light transmittance of the liquid crystal is close to zero is referred to as a state where the liquid crystal shutter is closed, and the state where the light transmittance of the liquid crystal is high is referred to as a state where the liquid crystal shutter is open.

Similarly, in the right-eye liquid crystal panel 44R, the arrow indicates the scanning direction of the screen, and the black region indicates that the light transmittance of the liquid crystal is close to zero. On the other hand, in the right-eye liquid crystal panel 44R, the white region indicates that the light transmittance of the liquid crystal is high.

FIG. 5 is a schematic block diagram of a liquid crystal shutter device (glasses) according to an embodiment of the present invention. The liquid crystal shutter device (glasses) 30 includes a signal receiver 31, a control signal generator 35, a left-eye liquid crystal module 40L, and a right-eye liquid crystal module 40R.

The left-eye liquid crystal module 40L includes a left-eye timing control unit 41L, a left-eye gate driver 42L, a left-eye source driver 43L, and a left-eye liquid crystal panel 44L.
On the other hand, the right-eye liquid crystal module 40R includes a right-eye timing control unit 41R, a left-eye gate driver 42R, a left-eye source driver 43R, and a left-eye liquid crystal panel 44R.

The signal receiving unit 31 receives the synchronization signal G_CTRL transmitted from the liquid crystal display device 10, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scan time TGdisp. The signal reception unit 31 supplies the control signal generation unit 35 with the received synchronization signal G_CTRL, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scanning time TGdisp.

The control signal generator 35 generates a vertical synchronization signal VSYNC and a horizontal synchronization signal HSYNC from the received synchronization signal G_CTR1.

Further, the control signal generator 35 generates data for the left eye based on the received synchronization signal G_CTR1, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scanning time TGdisp. An enable signal L_DE and a right data enable signal L_DE are generated.

Similarly, the control signal generation unit 35 is for the left eye based on the received synchronization signal G_CTRL1, a signal indicating the shutter start time TGstart, a signal indicating the shutter scanning time TGshut, and a signal indicating the entire scanning time TGdisp. A data signal L_DT and a right eye data signal R_DT are generated.

The control signal generation unit 35 supplies the generated vertical synchronization signal VSYNC, horizontal synchronization signal HSYNC, left-eye data enable signal L_DE, and left-eye data signal L_DT to the left-eye timing control unit 41L.
Similarly, the control signal generation unit 35 supplies the generated vertical synchronization signal VSYNC, horizontal synchronization signal HSYNC, right eye data enable signal R_DE, and right eye data signal R_DT to the right eye timing control unit 41R.

Subsequently, the left-eye liquid crystal module 40L will be described. Based on the received vertical synchronization signal VSYNC and horizontal synchronization signal HYNCC, the left-eye timing control unit 41L generates a left-eye gate start pulse signal GSP_L that is a vertical head line instruction signal and a left-eye gate clock that is a gate processing clock. A signal GCK_L is generated. The left-eye timing control unit 41L supplies these signals to the left-eye gate driver 42L.

The left-eye timing control unit 41L receives the left-eye source start pulse signal SSP_L, the left-eye source clock signal SCK_L, the left-eye source signal DT_L, and the left-eye latch strobe LS_L that is a data write start instruction signal to the panel. Generate. Then, the left-eye timing control unit 41L supplies these signals to the left-eye source driver 43L.

The left-eye gate driver 42L is controlled in timing by the left-eye gate start pulse signal GSP_L, the left-eye gate clock signal GCK_L, and the left-eye latch strobe LS_L supplied from the left-eye timing controller 41L. A scanning signal is supplied to the gate of the TFT of the left-eye liquid crystal panel 44L.

The left-eye source driver 43L is timing-controlled by the left-eye source start pulse signal SSP_L and the left-eye source clock signal SCK_L supplied from the left-eye timing control unit 14, and uses the left-eye source signal DT_L as data of the left-eye liquid crystal panel 44L. Supply to wiring.

The left-eye liquid crystal panel 44L supplies the supplied left-eye source signal DT_L to the pixels via the TFT. As a result, the left-eye liquid crystal panel 44L changes the light transmittance of the liquid crystal of the pixel.

The process for the right-eye liquid crystal module 40R is the same as that for the left-eye liquid crystal module 40L except that the received signal is different.

FIG. 6 is a diagram for explaining the relationship between the video scanning timing of the liquid crystal display device and the opening / closing timing of the liquid crystal shutter device (glasses). FIG. 6A is a diagram illustrating video scanning timing of the liquid crystal display device 10. In the figure, the horizontal axis represents time, and the vertical axis represents the scanning position in the vertical direction on the screen of the liquid crystal panel unit 17. An image R shown by hatching with diagonal lines represents a position in the vertical direction on the screen of the liquid crystal panel unit 17 on which the video data for the right eye is displayed, and time. On the other hand, an image L shown without hatching represents the position in the vertical direction on the screen of the liquid crystal panel unit 17 on which the video data for the left eye is displayed, and time. a [ms] is the time taken to scan once from the top to the bottom of the liquid crystal panel unit 17.

The arrow indicates the direction in which the vertical scanning position of the liquid crystal panel unit 17 changes with time. For example, the liquid crystal panel unit 17 scans sequentially from the top of the liquid crystal panel unit 17 and displays the image for the left eye. Then, until the next scanning, the liquid crystal panel unit 17 maintains the luminance of the pixel by maintaining the voltage applied to the liquid crystal capacitance in each pixel.

The liquid crystal panel unit 17 scans at intervals of several milliseconds so that the left eye image (L), the left eye image (L), the right eye image (R), and the right eye image (R) are sequentially displayed. Is displayed.
The liquid crystal panel unit 17 displays four images including the two left-eye images (L) and the two right-eye images (R) constituting one frame in 16.683 [ms]. An image of 60 frames per second is displayed.

FIG. 6B is a diagram showing the opening / closing timing of the liquid crystal shutter device (glasses) 30. In the figure, the horizontal axis is time. In the upper left liquid crystal panel 44L in the figure, the vertical axis represents the vertical scanning position on the screen of the left eye shutter. In the right-eye liquid crystal panel 44R in the lower part of the figure, the vertical axis represents the vertical scanning position on the screen of the right-eye liquid crystal panel 44R.

In FIG. 6B, the dots in the white area indicate the time when the liquid crystal shutter is open and the vertical position of the liquid crystal panel. On the other hand, the points in the black region indicate the time when the liquid crystal shutter is closed and the vertical position of the liquid crystal panel. The arrow indicates the vertical scanning direction of the liquid crystal panel.

The liquid crystal panel 17 displays the left-eye image (L) from the upper end to the lower end during time a. During the same time a, the left-eye liquid crystal panel 44L opens the liquid crystal shutter by increasing the light transmittance of the liquid crystal in synchronization with the liquid crystal panel 17.

The liquid crystal shutter device (glasses) 30 scans at the same timing as the scanning of the liquid crystal display device 10. As a result, the time during which the liquid crystal shutter is open is longer than in the prior art, so that brightness can be ensured.
Further, the right-eye image (R) light is transmitted only through the right-eye liquid crystal panel 44L, and the left-eye image (L) light is transmitted only through the left-eye liquid crystal panel 44L, so that no crosstalk occurs. .

FIG. 6C is a diagram showing how the image is seen when the display unit 17 of the liquid crystal display device 10 is viewed through the liquid crystal shutter device (glasses) 30 at points A and B in FIG. 6B. .
The left side of FIG. 6C shows the screen of the left-eye liquid crystal panel 44L, the screen of the right-eye liquid crystal panel 44R, and the screen of the liquid crystal panel unit 17 at point A.

At point A, the right-eye video (R) is displayed in the upper area 51D on the screen of the liquid crystal panel unit 17, and the left-eye video (L) is displayed in the lower area 52D.
The upper region 51L on the screen of the left-eye liquid crystal panel 44L has a liquid crystal light transmittance close to zero (the shutter is closed), and thus is for the right eye displayed on the upper side of the liquid crystal panel 17 of the video display device 10. Is blocked.
On the other hand, the upper region 51R on the screen of the right-eye liquid crystal panel 44R has a high light transmittance of the liquid crystal (the shutter is open), and therefore is for the right eye displayed on the upper side of the liquid crystal panel 17 of the video display device 10. Video (R) is displayed.

At point B, the right eye video (R) is displayed in the upper area 53D of the screen of the liquid crystal panel unit 17, and the left eye video (L) is displayed in the lower area 54D.
The lower region 52L of the screen of the left-eye liquid crystal panel 44L has a high light transmittance of the liquid crystal (the shutter is open), and therefore is for the left eye displayed on the lower side of the liquid crystal panel 17 of the video display device 10. Video (L) is displayed.
On the other hand, the lower region 52R on the screen of the right-eye liquid crystal panel 44R is displayed on the lower side of the liquid crystal panel 17 of the video display device 10 because the light transmittance of the liquid crystal is close to zero (the shutter is closed). The image for the right eye is blocked.

6C shows the screen of the left-eye liquid crystal panel 44L, the screen of the right-eye liquid crystal panel 44R, and the screen of the liquid crystal panel unit 17 at point B.
Similarly to the above, the upper region 53L on the screen of the left-eye liquid crystal panel 44L is displayed on the upper side of the liquid crystal panel 17 of the video display device 10 because the light transmittance of the liquid crystal is close to zero (the shutter is closed). The image for the right eye is blocked.
On the other hand, the upper region 53R on the screen of the right-eye liquid crystal panel 44R has a high light transmittance of the liquid crystal (the shutter is open), and thus is for the right eye displayed on the upper side of the liquid crystal panel 17 of the video display device 10. Video (R) is displayed.

The lower region 54L of the screen of the left-eye liquid crystal panel 44L has a high light transmittance of the liquid crystal (the shutter is open), and therefore is for the left eye displayed on the lower side of the liquid crystal panel 17 of the video display device 10. Video (L) is displayed.
On the other hand, the lower region 54R on the screen of the right-eye liquid crystal panel 44R is displayed below the liquid crystal panel 17 of the video display device 10 because the light transmittance of the liquid crystal is close to zero (the shutter is closed). The image for the right eye is blocked.

FIG. 7 is a diagram for explaining a method of calculating the position of the upper end and the position of the lower end of the region where the liquid crystal transmittance of the liquid crystal shutter device (glasses) 30 is changed. In the figure, a liquid crystal display device 10 is shown on the left side, and a liquid crystal shutter device (glasses) 30 is shown on the right side. The liquid crystal shutter device (glasses) 30 shows a left-eye liquid crystal panel 44L and a pattern 61 of the liquid crystal shutter device (glasses). A viewer's left eye 62 is shown below the handle 61 of the liquid crystal shutter device (glasses).

Subsequently, a calculation method of the synchronization signal G_CTRL, the shutter start time TGstart, the shutter scan time TGshut, and the entire scan time TGdisp by the calculation unit 13 of the liquid crystal display device 10 will be described.
The calculation unit 13 calculates the shutter height Hs in the liquid crystal shutter device (glasses) 30 by the following formula (1).
Hs = Dg / Dd × Hd (1)

Here, Dg is the distance between the left-eye liquid crystal panel 44L and the viewer's left eye 62, Dd is the distance between the liquid crystal panel unit 17 and the left-eye liquid crystal panel 44L, and Hd is the overall height of the liquid crystal panel unit 17. It is. Here, Hd is a unique value of the liquid crystal display device 10.
The distance Dg between the left-eye liquid crystal panel 44 </ b> L and the viewer's left eye 62 is a fixed value determined from the shape of the liquid crystal shutter device (glasses) 30.

The distance Dg may be calculated by a distance measuring sensor (not shown) attached to the liquid crystal shutter device (glasses) 30. The distance measuring sensor may measure a distance Dd between the liquid crystal panel unit 17 and the left-eye liquid crystal panel 44L.

Specifically, for example, the distance is measured by a laser distance sensor (used in construction or the like), an infrared distance sensor (also referred to as PSD), or an ultrasonic distance sensor.
Therefore, the distance Dd can be measured by mounting the distance sensor modules on the liquid crystal shutter device (glasses) 30.
Further, the distance may be fixed by fixing the viewing position.

As an example, the case of a 40-inch liquid crystal display device 10 will be described. Since it is 40 inches, the height Hd of the liquid crystal panel portion 17 is about 500.0 [mm] (more precisely, 498.0 [mm]). The height Hg of the entire left-eye liquid crystal panel 44L of the liquid crystal shutter device (glasses) 30 is 20.0 [mm]. The distance Dg between the left-eye liquid crystal panel 44 </ b> L and the viewer's left eye 62 is a unique value 26.0 [mm] determined by the structure of the liquid crystal shutter device (glasses) 30.

Under that condition, the spatial position measurement unit 21 measures the distance Dd between the liquid crystal panel unit 17 of the liquid crystal display device 10 and the left-eye liquid crystal panel 44L, and supplies the distance Dd to the calculation unit 13. The calculation unit 13 substitutes the distance Dd supplied from the spatial position measurement unit 21 and the predetermined height Hd and distance Dg of the liquid crystal panel unit 17 into the above formula (1), and uses them as a shutter. The height Hs to be used is calculated as 10.0 [mm].

Next, a method of calculating the shutter start vertical position Ht will be described. Here, the start vertical position Ht of the shutter is a distance from the upper end of the left-eye liquid crystal panel 44L to the upper end of the shutter region.
The calculation unit 13 calculates the start vertical position Ht of the shutter using the following equation (2).
Ht = He−Hc / Hd × Hs (2)

Here, He is the height of the upper end of the left-eye liquid crystal panel 44L with the viewer's left eye 62 as a reference. Hc is a relative height of the left-eye liquid crystal panel 44L with respect to the liquid crystal panel 17 described above. Hd is the height of the entire liquid crystal panel 17, and Hs is the height used as a shutter.

Since the height of the viewer's left eye 62 is a specific value determined by the structure of the liquid crystal shutter device (glasses) 30, the height He of the upper end of the left-eye liquid crystal panel 44 </ b> L as a reference for the viewer's left eye 62 is fixed. Value.
The distance from the upper end of the left-eye liquid crystal panel 44L to the viewer's left eye 62 may be measured by a distance measuring sensor (not shown) mounted on the liquid crystal shutter device (glasses) 30.

The calculation unit 13 calculates the relative height Hc from the spatial position information supplied from the spatial position measurement unit 21. The overall height Hd of the liquid crystal panel 17 is a fixed value. The height Hs used as the shutter is calculated by the control signal generation unit using Equation (1).
Accordingly, the calculation unit 13 calculates the shutter start vertical position Ht using Equation (2).

Specifically, for example, when the relative height Hc is 375.0 [mm] and the height He of the upper end of the left-eye liquid crystal panel 44L with respect to the viewer's left eye 62 is 15.0 [mm], the shutter starts. The vertical position Ht is 7.5 [mm].
Above, description of the calculation method of the height Hs used as a shutter by the calculation part 13 and the shutter start vertical position Ht is complete | finished.

Next, a method for calculating the timing t diff of the synchronization signal G_CTR1 with reference to the vertical synchronization signal VSYNC_D in the liquid crystal shutter device (glasses) 30 will be described.
FIG. 8 shows an image on the liquid crystal shutter device (glasses) 30 when the image displayed on the liquid crystal display device 10 is switched from the left eye image (L) to the right eye image (R) together with scanning. It is the figure which showed the scanning position Ls which closes a shutter. In the figure, the liquid crystal display device 10 is shown on the left side, and the liquid crystal shutter device (glasses) 30 is shown on the right side.

FIG. 8 (a) shows the scanning position Ls corresponding to the screen states of the left-eye liquid crystal panel 44L and the right-eye liquid crystal panel 44R shown on the left side of FIG. 6 (c). FIG. 8B shows the scanning position Ls corresponding to the screen states of the left-eye liquid crystal panel 44L and the right-eye liquid crystal panel 44R shown on the right side of FIG. FIG. 8C shows a case where the scanning position Ls further moves downward.

In FIG. 8, the state in which the video is switched from the left-eye video (L) to the right-eye video (R) is shown in the order of FIG. 8 (a), FIG. 8 (b), and FIG. 8 (c). Yes. Accordingly, the scanning position Ls of the liquid crystal shutter device (glasses) 30 transitions from top to bottom.

At this time, if the timing at which the scanning position Ls decreases is slower than the scanning speed of the liquid crystal display device 10, crosstalk occurs in which the right eye image (R) is mixed into the left eye.
On the other hand, if the timing at which the scanning position Ls decreases is earlier than the scanning speed of the liquid crystal display device 10, the time during which the shutter is open is shortened, so that the brightness of the image decreases. In this case, no crosstalk occurs.

Therefore, in order to maximize the effects of reducing crosstalk and ensuring brightness, the control signal generation unit 35 determines the shutter scanning start timing of the liquid crystal shutter device (glasses) 30 and the opening / closing speed of the shutter. Control.
Specifically, the control signal generator 35 controls the start timing of shutter scanning by adjusting the vertical synchronization signal VSYNC.
Further, the control signal generator 35 changes the horizontal scanning start timing interval by adjusting the horizontal synchronization signal HSYNC. Thereby, the control signal generator 35 controls the opening / closing speed of the shutter.

Next, an example of the vertical synchronization signal VSYNC and the horizontal synchronization signal HSYNC will be described.
FIG. 9 is a diagram illustrating video display timing of the liquid crystal display device, shutter opening / closing timing of the liquid crystal shutter device, and timing of the output signal of the left-eye timing control unit 41L. Here, the horizontal axis is time.

FIG. 9A is a timing chart of video display of the liquid crystal display device 10. Here, VSYNC_D is a vertical synchronization signal output from the calculation unit 13 of the liquid crystal display device 10. DATA is a video signal output from the calculation unit 13 of the liquid crystal display device 10. G_CTRL is a synchronization signal transmitted by the signal transmission unit 22.

FIG. 9B is a timing chart for opening and closing the shutter of the liquid crystal shutter device 30. Here, VSYNC is a vertical synchronization signal output from the control signal generator 35 of the liquid crystal shutter device 30. HSYNC is a horizontal synchronization signal output from the control signal generator 35 of the liquid crystal shutter device 30. L_DE is a left-eye data enable signal output from the control signal generator 35, and L_DT indicates a video signal supplied to the left-eye source driver.

A box indicated by a time TDdisp for scanning the liquid crystal panel 17 of the liquid crystal display device 10 from the top to the bottom (Hd height) in the line of the video signal DATA output from the calculation unit 13 of the liquid crystal display device 10. The shape portion indicates the video display valid (data enable) period of the display panel 17.

TGfp is the time between the pulse time of the vertical synchronization signal VSYNC of the liquid crystal shutter device (glasses) 30 and the onset time of the left-eye data enable signal L_DE that occurs after that time.
t diff is a synchronization signal G_CTRL generated by the liquid crystal display device 10 based on the pulse time of the vertical synchronization signal VSYNC_D for displaying the first left-eye video image that the liquid crystal display device 10 scans twice. It's time. Here, the pulse timing of the synchronization signal G_CTRL generated by the liquid crystal display device 10 and the pulse timing of the vertical synchronization signal VSYNC of the liquid crystal shutter device 30 are the same.

In the line of the video signal L_DT displayed on the left-eye liquid crystal panel, the box-shaped portion indicated by the time TGdisp for scanning the panel area (Hg height) of the liquid crystal shutter is the left-eye liquid crystal panel 44L. A scanning period is shown. Of the box-shaped portion, the blacked-out portion represents a state where the shutter is closed (the light transmittance of the liquid crystal is close to zero) when the liquid crystal panel is scanned. On the other hand, a white portion of the box-shaped portion represents a state in which the shutter is open (the light transmittance of the liquid crystal is high) when the liquid crystal panel is scanned.

TGstart indicates the time taken to scan from the upper end of the liquid crystal shutter to the height of the shutter start vertical position Ht. TDshut is a time for scanning a height Hs used as a shutter among the heights Hd of the left-eye liquid crystal panel 44L or the right-eye liquid crystal panel 44R.

R_DE is a right-eye data enable signal output from the control signal generator 35, and R_DT indicates a video signal displayed on the right-eye liquid crystal panel.
The right-eye data enable signal R_DE is the same as the left-eye data enable signal L_DE. The video signal R_DT supplied to the right eye source driver indicates that the shutter is open only when the liquid crystal display device 10 displays the right eye data (R).

The time TDdisp for scanning the liquid crystal panel 17 of the liquid crystal display device 10 from the top to the bottom (Hd height) is set to the same time as the shutter scanning time TGshut.
The relationship is represented by the following formula (3).
TDdisp = TGshut (3)
By doing so, it is possible to make the video display scan and the shutter open / close scan speed the same.

Further, if the start of scanning of the liquid crystal panel of the liquid crystal shutter device (glasses) 30 is advanced by the shutter start time TGstart with respect to the start of display scanning on the display, the shutter start timing can be matched.
The calculation unit 13 calculates the shutter start time TGstart from the following equation (4).
TGstart = Ht / Hs × TGshut (4)

In the embodiment of the present invention, the pulse timing of the glasses vertical synchronization signal VSYNC is made the same as the pulse timing of C_CTRL supplied from the liquid crystal display device 30. The generation of the VSYNC may be delayed, but it is necessary to prevent the timing of the video display period TDdisp and the shutter scanning time TGshut from being shifted.
Therefore, the calculation unit 13 calculates the timing t diff of the synchronization signal G_CTR1 using the vertical synchronization signal VSYNC_D as a reference (time zero) by the following equation (5).

t diff = TDfp−TGstart−TGfp (5)
Here, TGfp is the time (glasses module front porch) from the vertical synchronization signal VSYNC until the liquid crystal shutter starts scanning. TDfp is a time (display module front porch) from the vertical synchronization signal VSYNC_D of the liquid crystal display device 10 until the liquid crystal panel 17 starts scanning.

Then, the calculation unit 13 generates the synchronization signal G_CTRl by calculating the timing t diff of the synchronization signal G_CTRl.

Here, as the distance between the liquid crystal shutter device (glasses) 30 and the liquid crystal display device 10 increases, the liquid crystal shutter device (glasses) 30 has a longer time TGstart in order to reduce the area in which the liquid crystal shutter is opened. For this reason, the onset time of L_DE of the data enable signal for the left eye may be earlier than the time of the vertical synchronization signal VSYNC_D of the liquid crystal display device 10.
Further, the calculation unit 13 calculates the entire scan time TGdisp by the following expression (6) from the relationship between the display area height Hg of the glasses and the shutter area height Hs.
TGdisp = Hg / Hs × TGshut (6)

In the present embodiment, the calculation unit 13 of the liquid crystal display device 10 calculates the parameter. However, the present invention is not limited to this, and the control signal generation unit 35 of the liquid crystal shutter device (glasses) 30 may calculate the parameter. Good. In this case, for example, the control signal generation unit 35 receives the vertical synchronization signal VSYNC from the liquid crystal display device 10, and calculates the parameter based on the vertical synchronization signal VSYNC.

In the present embodiment, the spatial position detection unit 13 of the liquid crystal display device 10 detects the position of the liquid crystal shutter device (glasses) 30. However, the present invention is not limited to this, and the liquid crystal shutter device (glasses) 30 calculates its own position. May be.

FIG. 9C is a diagram illustrating the timing of the output signal of the left-eye timing control unit 41L. Here, DT_L is video data, SSP_L is a source start pulse that is a video data read start instruction signal, LS_L is a latch strobe that is a data write start instruction signal to the panel, and GCK_L is a gate processing clock. A gate clock, GSP_L is a gate start pulse which is a vertical head line instruction signal.

Timing signals generated from the left-eye timing control unit 41L are mainly a source start pulse SSP_L, a latch strobe LS_L, a gate clock GCK_L, and a gate start pulse GSP_L, and the respective signals will be described below.
The source start pulse SSP_L is a signal for outputting a pulse indicating the timing at which the horizontal video signal starts. The latch strobe LS_L is a signal for outputting a pulse for transferring the video to the output line buffer of the source driver after the horizontal video signal is finished.

GCK_L is a signal that outputs a pulse for changing the gate line line by line, and GSP_L is a signal that outputs a pulse for returning the gate line to the head. The timing of these signals is determined by the design specifications of the liquid crystal panel and driver used.

FIG. 9D is an enlarged view of the output signal timing of the left-eye timing control unit 41L shown in FIG. 9C. Here, since the gate line is changed line by line, when the gate clock GCK_L becomes HIGH, a pulse of the latch strobe LS_L is generated after a predetermined time to transfer the video to the output line buffer of the source driver. As a result, the video data DT_L starts to be supplied to the output line buffer of the source driver.

When a pulse of the latch strobe LS_L is generated, a source start pulse SSP_L indicating a timing at which a horizontal video signal starts is generated after a predetermined time.
Due to the generation of the SSP_L pulse, the video data DT_L starts to be supplied to the TFT source of each pixel of the left-eye liquid crystal panel 44L. Thus, the left-eye liquid crystal panel 44L can display video data at a predetermined timing.

In the above description, the signal timing of the right-eye liquid crystal module has been described. However, the signal timing of the right-eye liquid crystal module is in principle the same as the signal timing of the left-eye liquid crystal module, and thus the description thereof is omitted. .

FIG. 10 is a diagram illustrating the scan timing in the vertical direction of the liquid crystal display device 10 and the liquid crystal shutter device (glasses) 30. FIG. 10A is a diagram showing the left and right display switching timing of the image of the liquid crystal display device 10. Here, the horizontal axis is time, and the vertical axis is the vertical direction of the screen of the liquid crystal panel unit 17. After the screen has been scanned twice to display the left-eye video, the screen is scanned twice in order to display the right-eye video.
One frame includes two scans for an image for the right eye and two scans for an image for the left eye. One frame is 16.7 [ms], and 59.94 frames are displayed per second.

FIG. 10B is a diagram showing the opening / closing timing of the liquid crystal shutter of the liquid crystal shutter device 30. The horizontal axis is time, and the vertical axis is the vertical direction of the screen. A black area indicates a state where the liquid crystal shutter is closed, and a white area indicates a state where the liquid crystal shutter is open. In the upper part of FIG. 10B, the opening / closing timing of the left-eye liquid crystal panel 44L is shown. In the lower part of FIG. 10B, the opening / closing timing of the right-eye liquid crystal panel 44R is shown.

Here, a case will be described in which processing for a full HD 3D image of 59.94 frames per second is considered in the 40-inch liquid crystal display device 10 described above. When each image on the left and right is displayed in quadruple speed in the order of left-eye video (L), left-eye video (L), right-eye video (R), and right-eye video (R), each video is displayed. The time TDtotal for performing the calculation is 4.171 (= 1.684 / 4) [ms] including the blanking period.

Further, the time TDdisp for scanning the liquid crystal panel 17 of the liquid crystal display device 10 from top to bottom (Hd height) is 4.004 (= 4.171 × 1080/1125) [ms]. A time TDfp from the pulse generation time of the vertical synchronization signal VSYNC_D of the liquid crystal display device 10 to the time when the liquid crystal display device 10 starts displaying an image on the liquid crystal panel unit 17 is set to 0.152 [ms].

From the above equation (3), the time TGshut for scanning the portion (Hs height) used as the shutter in the panel area (Hg height) of the liquid crystal shutter is determined by the liquid crystal panel unit 17 of the liquid crystal display device 10. Since it is the same time as the time TDdisp for scanning from top to bottom (Hd height), it is 4.004 [ms].

Accordingly, the time TGdisp for scanning the panel area (Hg height) of the liquid crystal shutter is 8.008 (= 20.0 / 10.0 × 4.004) [ms] using the above equation (6). ].
The time TGstart required to scan from the upper end of the liquid crystal shutter to the height of the shutter start vertical position Ht is 2.002 (= (8.008-4.004) / 2) [ms using the above equation (5). ].

The timing t diff of the synchronization signal G_CTRl with the vertical synchronization signal VSYNC_D as a reference when the pulse time of the vertical synchronization signal VSYNC_D for displaying the first left-eye video in the liquid crystal display device 10 scanning twice is used as a reference. Is 2.002 (= 4.004-2.002) [ms].

With the above method, the calculation unit 13 calculates each timing parameter for controlling the shutter opening / closing timing of the liquid crystal shutter.
By generating each of the timing parameters described above, the liquid crystal panel of the liquid crystal shutter device (glasses) 30 is controlled accordingly, thereby reducing crosstalk without sacrificing video brightness. .

In the embodiment of the present invention, the liquid crystal display device 10 measures the distance Dd between the liquid crystal panel of the liquid crystal shutter device 30 and the liquid crystal display device 10 and the height Hc of the liquid crystal panel with respect to the liquid crystal display unit. This is not a limitation.
The liquid crystal shutter device 30 includes a position measurement unit, and the position measurement unit measures the distance Dd between the liquid crystal panel of the liquid crystal shutter device 30 and the liquid crystal display device 10 and the height Hc of the liquid crystal panel with respect to the liquid crystal display unit. May be.

In the embodiment of the present invention, the calculation unit 13 of the liquid crystal display device 10 calculates each timing parameter (Hs, Ht, TGstart, tdiff) for controlling the shutter opening / closing timing of the liquid crystal shutter. Not a thing.
Based on the distance Dd between the liquid crystal panel of the liquid crystal shutter device 30 and the liquid crystal display device 10 and the height Hc of the liquid crystal panel with respect to the liquid crystal display unit, the control signal generation unit 35 of the liquid crystal shutter device 30 Each timing parameter (Hs, Ht, TGstart, tdiff) for controlling the shutter opening / closing timing may be calculated.

FIG. 11 is a flowchart showing a processing flow of the liquid crystal display device 10. First, the receiving unit 11 receives radio waves from an antenna. Then, the receiving unit 11 converts the received radio wave into a video signal (step S101). The receiving unit 11 supplies the converted video signal to the image adjusting unit 12.

Next, the image adjustment unit 12 performs I / P conversion on the luminance signal with reduced noise (step S102). Then, the image adjustment unit 13 adjusts the number of pixels of the I / P converted signal. Then, the image adjustment unit 12 supplies the video signal whose number of pixels has been adjusted to the calculation unit 13.
Next, the spatial position measurement unit 21 measures the spatial position of the liquid crystal shutter device (glasses) 30 and supplies it to the calculation unit 13 (step S103).

Next, the calculation unit 13 generates a synchronization signal G_CTRL which is a signal for synchronizing with the liquid crystal shutter on the glasses side to the signal transmission unit 22 based on the spatial position of the glasses 30 of the vertical synchronization signal VSYNC_D, The synchronization signal G_CTRL is supplied to the signal transmission unit 22.
Next, the signal transmission unit 22 transmits the synchronization signal G_CTRL to the signal reception unit 31 of the liquid crystal shutter device (glasses) 30 (step S104).

Next, the calculation unit 13 generates a vertical synchronization signal VSYNC_D that is a signal for synchronizing the scanning of the video signal in the vertical direction, and supplies the vertical synchronization signal VSYNC_D to the timing control unit 14. In addition, the calculation unit 13 supplies the image signal DATA whose image has been adjusted to the source driver unit 15.
Next, the timing control unit 14 generates a clock signal for distributing the video data supplied to the liquid crystal module to the pixels on the plane. Then, the timing control unit 14 supplies the generated clock signal to the source driver unit 15 and the gate driver unit 16 (step S105).

Next, the source driver 15 generates a gradation voltage for driving the liquid crystal (step S105). The source driver unit 15 holds the gradation voltage for each source line by an internal hold circuit.

Next, the gate driver unit 16 supplies a predetermined voltage to the TFT gate line of the display unit 17 (step S106).
Next, the source driver unit 15 applies the gradation voltage to the TFT source line of the display unit 17 in synchronization with the clock signal supplied from the timing control unit 14 with respect to the vertical arrangement of the screen. Supply (step S107).

Thus, video data is sequentially supplied to the source line within the time when each gate line is selected, and a necessary voltage is applied to the pixel electrode via the TFT. Thus, the pixel electrode changes the light transmittance of the corresponding liquid crystal according to the voltage applied to the pixel electrode. Thereby, the display unit 17 displays the video signal (step S108). Above, this flowchart is complete | finished.

FIG. 12 is a flowchart showing a processing flow of the liquid crystal shutter device 30. First, the signal receiving unit 31 receives the synchronization signal G_CTRL transmitted from the signal transmission unit 22 of the liquid crystal display device 10 (step S201). Next, the control signal generator 35 calculates each timing parameter. Next, the control signal generator 35 generates a vertical synchronization signal VSYNC based on the timing parameter (step S202).

Next, the control signal generation unit 35 generates a horizontal synchronization signal HSYNC based on the timing parameter (step S203). Next, the control signal generator 35 generates a left-eye data enable signal L_DE and a right-eye data enable signal R_DE based on the timing parameter (step S205).

Next, the control signal generator 35 generates a left-eye data signal L_DT and a right-eye data enable signal R_DT based on the timing parameter (step S206).
Next, the control signal generator 35 supplies the left-eye liquid crystal module with the vertical synchronization signal VSYNC, the horizontal synchronization signal HSYNC, the left-eye data enable signal L_DE, and the left-eye data signal L_DT. The light transmittance of the liquid crystal of the liquid crystal panel unit is controlled (step S207).

Further, the control signal generation unit 35 supplies the right-eye liquid crystal module to the right-eye liquid crystal module by supplying a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, a right-eye data enable signal R_DE, and a right-eye data signal R_DT. The light transmittance of the liquid crystal in the panel unit is controlled (step S207). Above, this flowchart is complete | finished.

In the embodiment of the present invention, a process in the case of exceeding the control limit by the configuration of the stereoscopic display system including the liquid crystal display device 10 and the liquid crystal shutter device 30 will be described. First, the control limit points will be described.

FIG. 13 is a diagram showing the vertical scanning timing of the liquid crystal display device and the liquid crystal shutter device (glasses) when the distance between the liquid crystal display device and the liquid crystal shutter device (glasses) is increased.

FIG. 13A is a diagram showing the left and right display switching timing of the image of the liquid crystal display device 10. Here, the horizontal axis is time, and the vertical axis is the vertical direction of the screen of the liquid crystal panel unit 17.
After the screen has been scanned twice to display the left-eye video, the screen is scanned twice in order to display the right-eye video.
One frame includes two scans for an image for the right eye and two scans for an image for the left eye. One frame is 16.7 [ms], and 59.94 frames are displayed per second.

FIG. 13B shows the opening and closing of the left-eye liquid crystal panel 44L of the liquid crystal shutter device 30 when the distance Dd between the liquid crystal panel 17 and the left-eye liquid crystal panel 44L is larger than that in the case of FIG. It is a figure in which timing was shown. The horizontal axis is time, and the vertical axis is the vertical direction of the screen. A black area indicates a state where the liquid crystal shutter is closed, and a white area indicates a state where the liquid crystal shutter is open. The width of the liquid crystal shutter in the vertical direction is narrower than the width shown in FIG.

When the distance Dd between the liquid crystal panel 17 and the left-eye liquid crystal panel 44L is increased, the height Hs used as a shutter is higher than the overall height Hg of the left-eye liquid crystal panel 44L from the relationship of the above equation (1). The height is small.

In that case, as shown in FIG. 13, in order to maintain the time TGshut for scanning the portion used as the shutter (Hs height), the panel area (Hg height) of the liquid crystal shutter is scanned. Time TGdisp becomes longer. At this time, there is a condition that the time TGdisp for scanning the panel area (Hg height) of the liquid crystal shutter should not exceed the entire scanning time TGtotal including the vertical blanking period of the glasses panel.

Here, when the blank period TGblank is a time obtained by subtracting a time TGdisp for scanning the panel area (Hg height) of the liquid crystal shutter from the entire scan time TGtotal, the blank period TGblank is expressed by the following equation (7). It is represented by
TGblank = TGtotal−TGdisp (7)
It is necessary to prevent this blank period TGblank from becoming zero.
In reality, since a return period is required, TGblank needs to be longer than the return period.

When the liquid crystal display device 10 is a quadruple speed drive in which the left-eye video (L), the left-eye video (L), the right-eye video (R), and the right-eye video (R) are displayed in this order, the entire scan is performed. The time TGtotal is twice the time TDtotal for displaying each video. Therefore, in the case of the n-times speed liquid crystal display device 10, the entire scan time TGtotal is expressed by the following equation (8).
TGtotal = TDtotal × n / 2 (8)

Since the blank period TGblank needs to be 0 or more, the following conditional expression (9) is obtained from the above expression (7).
TGtotal-TGdisp ≧ 0 (9)
It is expressed. Here, the above equation (8) is substituted into TGtotal, and the above equation (6) is substituted into TGdisp. Furthermore, it is assumed that the above equation (3) is substituted for TGshut of the obtained mathematical expression.

Thus, the control limit condition is expressed by the following equation (10).
Hg / Hs ≦ (n / 2) × (TDtotal / TDdisp) (10)
If the viewing distance does not satisfy this inequality (10), the liquid crystal scan on the display side and the liquid crystal scan on the glasses side cannot be synchronized, and a highly accurate shutter operation becomes impossible.

The liquid crystal shutter device (glasses) 30 can check whether the current viewing position exceeds the limit point by satisfying this inequality (10) or by determining at every predetermined time interval.

FIG. 14 is a flowchart showing a flow of processing for determining whether or not the position of the liquid crystal shutter device by the liquid crystal display device is within the control range. First, the spatial position measurement unit 21 of the liquid crystal display device 30 measures the spatial position of the liquid crystal shutter device (glasses) 30. Then, the distance between the liquid crystal display device 30 and the liquid crystal shutter device (glasses) 30 is extracted from the spatial position measurement unit 21 (step S301). The spatial position measurement unit 21 supplies the extracted distance to the calculation unit 13.

Next, the calculation unit 13 calculates the shutter height Hs from the distance supplied from the spatial position measurement unit 21 using the above equation (1) (step S302). Next, the calculation unit 13 determines whether or not the expression (10) is satisfied, for example, every 1/60 seconds (step S303).

If the above expression (10) is satisfied (YES in step S303), the process returns to step S301. When the above expression (10) is not satisfied (NO in step S303), the calculation unit 13 supplies the warning signal transmission unit 23 with a control signal for controlling the warning signal transmission unit 23 to emit a warning sound. The warning signal transmitter 23 outputs a warning sound (step S304). Above, this flowchart is complete | finished.

As described above, since the warning sound is output when the liquid crystal shutter device (glasses) 30 is far from the liquid crystal display device 30 such that the above formula (10) is not satisfied, it is possible to prevent crosstalk from occurring. it can.

Although the calculation unit 13 is controlled to output a warning sound, the present invention is not limited to this, and the calculation unit 13 may be controlled to display a warning image on the liquid crystal panel 17.
Moreover, although the liquid crystal display device 30 determined whether or not the position of the liquid crystal shutter device (glasses) 30 is within the control range, the present invention is not limited to this, and the liquid crystal shutter device (glasses) 30 itself may determine.

In the embodiment of the present invention, the scanning direction of the liquid crystal display device 10 is described as being vertical, but the scanning direction of the liquid crystal display device 10 may be horizontal. In this case, the scanning direction of the liquid crystal shutter device (glasses) 30 is also set to the horizontal direction.

This will be specifically described with reference to FIG. FIG. 15 is a diagram for explaining a method of opening and closing the liquid crystal shutter in the horizontal direction. In the figure, the scanning direction of the liquid crystal panel of the liquid crystal shutter device 30 is horizontal.
In this case, as a method for calculating the control parameter, the above-described vertical scanning means may be replaced with a horizontal means.

In the present embodiment, the liquid crystal shutter has been described as a liquid crystal panel that opens and closes a shutter in units of vertical or horizontal lines. However, the present invention is not limited to this, and an active matrix panel may be used.
FIG. 16 is a diagram for explaining that an active matrix type liquid crystal panel is used to close a shutter at the end of the liquid crystal panel in a direction perpendicular to the scanning direction of the liquid crystal panel of the glasses.

FIG. 16A is a diagram for explaining the closing of the right and left shutters of each liquid crystal shutter when the active liquid crystal panel is used to scan the liquid crystal panel in the vertical direction. is there.
In this figure, the light transmittance of the liquid crystal at the right and left ends of each liquid crystal shutter is close to zero, that is, in a so-called masked state.

FIG. 16B is a diagram for explaining closing of the right end and left end shutters of each liquid crystal shutter when the active matrix liquid crystal panel is used to scan the liquid crystal panel of the glasses in the horizontal direction. is there.
In this figure, the light transmittance of the liquid crystal at the upper and lower ends of each liquid crystal shutter is close to zero, that is, a so-called masked state.

Using the above-described means, the image display can be performed by detecting the range covering the entire liquid crystal display device on the liquid crystal panel for glasses 30 and setting the mask area shown in FIG. Only the image on the display can pass through the shutter of the glasses.
As a secondary effect, flickering from the periphery of the video display can be reduced.

When the viewing distance satisfying the inequality (10) is exceeded, the scanning speed n of the liquid crystal display device 10 or the vertical synchronization period TDtotal of the liquid crystal display device 10 may be increased.
Further, the screen may be made smaller by reducing the video display area time TDdisp of the liquid crystal display device 10.

In addition, although this invention demonstrated the liquid crystal display device, it is not restricted to this, The display apparatus by which time division drive, such as a plasma display and an organic electroluminescent display, is performed may be sufficient.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope not departing from the gist of the present invention.

The present invention is suitable for use in display devices such as a television receiver, a mobile phone, a computer, an electronic book terminal, and an electronic dictionary, but is not limited thereto.

1 Display System 10 Liquid Crystal Display (Display)
DESCRIPTION OF SYMBOLS 11 Reception part 12 Image adjustment part 13 Calculation part 14 Timing control part 15 Source driver part 16 Gate driver part 17 Liquid crystal panel part 18 Gate line 19 Source line 20 Liquid crystal display part 21 Spatial position measurement part 22 Signal transmission part 23 Warning signal transmission part 30 LCD shutter device (glasses)
31 signal receiver 35 control signal generator 40L left eye liquid crystal module 40R right eye liquid crystal module 41L left eye timing controller 41R right eye timing controller 42L left eye gate driver 42R right eye gate driver 43L left eye gate driver 43R right eye gate Driver 44L LCD panel for left eye 44R LCD panel for right eye

Claims (8)

  1. A display unit for displaying images;
    A spatial position measurement unit that measures the relative position of the shutter device with respect to its own device;
    A calculation unit for calculating a shutter opening / closing timing of the shutter device based on the relative position;
    A display device in which time-division driving is performed.
  2. The display device according to claim 1, further comprising a signal transmission unit that transmits the shutter opening / closing timing to the shutter device.
  3. The calculation unit generates a synchronization signal for synchronizing the timing at which the display unit displays an image and the timing at which the shutter device changes the light transmittance of the liquid crystal based on the shutter opening / closing timing. ,
    The display device according to claim 2, wherein the signal transmission unit transmits the synchronization signal to the shutter device.
  4. A panel unit for changing the light transmittance;
    A control signal generation unit that generates a control signal for controlling the opening / closing timing of the shutter, based on the relative position of the own device with respect to the display device that is time-division driven;
    A shutter device comprising:
  5. The liquid crystal shutter device according to claim 4, further comprising a position measuring unit that measures the relative position.
  6. The liquid crystal shutter device according to claim 4, further comprising a signal receiving unit that receives the relative position.
  7. A display device that performs time-division driving;
    A shutter device;
    With
    The display device that performs the time-division driving includes a display unit that displays an image, a spatial position measurement unit that measures a relative position of the shutter device with respect to its own device, and the shutter device based on the relative position. And a calculation unit for calculating the shutter opening / closing timing of the display system.
  8. A display device that performs time-division driving;
    A shutter device;
    With
    The shutter device includes: a panel unit that changes light transmittance; and a control signal generation unit that generates a control signal for controlling the opening / closing timing of the shutter based on a relative position of the device with respect to the display device. A display system comprising:
PCT/JP2011/062591 2010-06-01 2011-06-01 Display device executing time-shared driving, shutter device, and display system WO2011152451A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010125896 2010-06-01
JP2010-125896 2010-06-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012109763A (en) * 2010-11-17 2012-06-07 Seiko Epson Corp Shutter spectacles and image display system
JP2013187842A (en) * 2012-03-09 2013-09-19 Casio Comput Co Ltd Stereoscopic image glasses, stereoscopic image viewing method, and program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009031524A (en) * 2007-07-26 2009-02-12 Sony Corp Stereoscopic image display device and stereoscopic image display method
JP2010117437A (en) * 2008-11-11 2010-05-27 Colorlink Japan Kk Liquid crystal display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009031524A (en) * 2007-07-26 2009-02-12 Sony Corp Stereoscopic image display device and stereoscopic image display method
JP2010117437A (en) * 2008-11-11 2010-05-27 Colorlink Japan Kk Liquid crystal display device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012109763A (en) * 2010-11-17 2012-06-07 Seiko Epson Corp Shutter spectacles and image display system
US9035924B2 (en) 2010-11-17 2015-05-19 Seiko Epson Corporation Shutter glasses and image display system
JP2013187842A (en) * 2012-03-09 2013-09-19 Casio Comput Co Ltd Stereoscopic image glasses, stereoscopic image viewing method, and program

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