JPH0843790A - Stereoscopic image display device - Google Patents

Abstract

PURPOSE:To provide a stereoscopic image display device capable of displaying stereoscopic images without deviation of the display images at each field in a perpendicular direction and without making the right and left display images visible deviatively in the perpendicular direction. CONSTITUTION:This stereoscopic image display device has first and second display devices 7L, 7R having pixels of the number of lines at which video signals for at least one frame-component are displayable in the perpendicular direction. The one display device executes writing to the two lines, n line and (n+1) line (n is a positive odd number), signals for the one line-component with the one video signal corresponding to the video signals for the left eye or right eye separated by a video signal separating means 2 and display the video signals while executing scan in the perpendicular direction by the two lines each from the first line. The other display device executes writing to the two lines, (n+1) line and (n+2) line, by the signals for the one line- component with the other video signal and display the video signals while executing scan in the perpendicular direction by the two lines each from the second line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device capable of displaying a stereoscopic image by using two liquid crystal panels.

[0002]

2. Description of the Related Art Conventionally, a stereoscopic image display device is constructed as shown in FIG. In the figure, 1 is an input terminal for stereoscopic video signals, 2 is a separation circuit for stereoscopic video signals, 3L and 3R are signal processing circuits, 4L and 4R are drive circuits for display devices, and 5L and 5R are display devices. 11 and 12 are diagrams for explaining the stereoscopic video signal. Generally, in order to obtain a stereoscopic video signal, two cameras are arranged,
It is necessary to obtain the video signals of the right-eye image and the left-eye image of an object that differ by an amount corresponding to binocular parallax from two cameras. FIG. 11 shows two video signals obtained from two left and right cameras for each field. Since these two signals are transmitted as one system signal, conventionally, as shown in FIG. 12, the output signal of the right camera and the output signal of the left camera are switched for each field to form one stereoscopic video signal. A field sequential method has been proposed.

When this stereoscopic video signal is input from the input terminal 1 in the apparatus of FIG. 10, the video signal separation circuit 2 separates the left and right video signals. The left and right video signals separated by the video signal separation circuit 2 are respectively processed by the signal processing circuits 3L and 3L.
3R and drive circuits 4L and 4R. The signal processing circuits 3L and 3R convert the input video signal into a predetermined format that can be displayed on the display device. The drive circuits 4L and 4R output drive pulses for the display device in synchronization with the input video signal. The video signals converted into a predetermined format by the signal processing circuits 3L and 3R and the video signals output from the drive circuits 4L and 4R are input to the display devices 5L and 5R, so that a left image is displayed on the display device 5L. Is displayed, and the image for the right is displayed on the display device 5R. At this time, the display device 5R is placed at a position where only the left eye of the observer can see the display device 5L.
The observer can see the displayed image as a stereoscopic image by arranging the image in a position where only the right eye can see.

FIG. 13 is a circuit diagram showing the configuration of the video signal separation circuit 2. In the figure, 41 is an input terminal for inputting a stereoscopic video signal, 42 is a field memory, 43 is a sync separation circuit, 44 is a SW control circuit, and 45L and 45R.
Is a switch, and 46L and 46R are output terminals for left and right video signals. The signal input from the input terminal 41 includes a field memory 42, a sync separation circuit 43,
It is input to the b terminal of the switch 45L and the a terminal of the switch 45R. The signal input to the field memory 42 is stored in the field memory 42, and the video signal read therefrom, that is, the video signal delayed by one field, is input to the a terminal of the switch 45L and the b terminal of the switch 45R. The signal input to the sync separation circuit 43 is separated by the sync separation circuit 43, and the switch control circuit 44 generates control signals for controlling the switches 45L and 45R from the separated sync signal. That is, in the first field, the switches 45L and 45 are
R is connected to the terminal a side, and switch 4 is used in the second field.
5L and 45R are connected to the terminal b side. By doing so, the signals obtained from the output terminals 46L and 46R are separated from the stereoscopic video signal of the field sequential system into left and right video signals as shown in FIG. The signal of the missing portion is pre-interpolated with the signal of the immediately preceding field.

[0005]

However, in the above-described conventional example, when the left and right video signals separated from the field sequential stereoscopic video signal are displayed using the CRT as a display device, interlaced scanning is performed. Figure 1
As shown in FIG. 5, the odd lines are scanned in the first field, and the even lines are scanned in the second field for display. Therefore, in the above conventional example, the first field and the second field
Since the field signal is the same as the pre-interpolated signal, it is displayed at a position shifted by one line in the vertical direction between the first field and the second field as shown in FIG. The display image will appear to blur vertically for each field.

Further, when a liquid crystal panel is used as a display device, the liquid crystal panel normally does not display by interlaced scanning, so that it is composed of about 240 lines in the vertical direction. Therefore, when the video signal of the above-mentioned conventional example is displayed on the liquid crystal panel, it becomes as shown in FIG. 16, and the left video signal and the right video signal are signals shifted by one line in the vertical direction as shown in FIG. In the case of no display, it is displayed at the same position in the vertical direction. That is, since the signal for the left is displayed one line above the actual position in the vertical direction, the left and right display images appear to be shifted in the vertical direction.

A first object of the present invention is to provide a stereoscopic image display device having a display device which is arranged in a position where it can be seen only by the left and right eyes respectively. It is an object of the present invention to provide a stereoscopic image display device capable of displaying a stereoscopic image without blurring the display image in the vertical direction for each image, and when the LCD is used, the display images on the left and right display devices do not appear to be vertically displaced.

A second object of the present invention is to automatically determine whether the left and right video signals in the field sequential stereoscopic video signal are even fields or odd fields. An object of the present invention is to provide a stereoscopic image display device capable of displaying the display positions of images on the left and right display devices at correct positions.

[0009]

In order to achieve the above object, a stereoscopic image display apparatus of the present invention is a video signal separating means for separating a field sequential stereoscopic video signal into video signals for the left and right eyes. And a first display having a number of lines of pixels capable of displaying at least one frame of video signal in the vertical direction for displaying the separated left-eye video signal at a position where only the left eye can see Device,
A second display device having pixels of the number of lines capable of displaying at least one frame of video signal in the vertical direction for displaying the separated right-eye video signal at a position where only the right eye can see; One of the first display device and the second display device has one of the corresponding one of the left-eye and right-eye video signals separated by the video signal separating means. N lines and (n + 1) lines (n is a positive odd number) depending on the signals for the lines
2 lines are written and the lines are sequentially scanned from the first line by 2 lines in the vertical direction and displayed. The other display device uses the signal for one line for the other video signal. It is characterized in that writing is performed on two lines of (n + 1) line and (n + 2) line, and this is performed by sequentially scanning every two lines from the second line in the vertical direction for display.

Further, in a preferred mode, a left / right discriminating means for discriminating which of a left-eye video signal and a right-eye video signal of a predetermined field of a field-sequential stereoscopic video signal, and a field-sequential system. Field discrimination means for discriminating whether the predetermined field of the stereoscopic video signal is an odd field or an even field, and the left-eye video signal is an odd field by the left / right discrimination means and the field discrimination means. When it is determined, the first display device writes the two lines of the n line and the (n + 1) line (n is a positive odd number) by the signal of one line, and the writing is sequentially performed for each two lines from the first line. The second display device displays the signal for one line on (n + 1) lines while performing the display while scanning in the vertical direction. Writing is performed on two (n + 2) lines, and this is performed by sequentially scanning two lines from the second line in the vertical direction, and displayed. Further, the left-right discriminating means and the field discriminating means are used for the left eye. When it is determined that the video signal of (1) is an even field, the first display device outputs a signal for one line (n +
1) line and (n + 2) line are written, and the lines are sequentially scanned by 2 lines from the 2nd line in the vertical direction and displayed, and the second display device displays 1 line of signal for n lines. And (n + 1) lines are written to, and the lines are sequentially scanned by two lines from the first line in the vertical direction for display.

[0011]

[Function] In the field-sequential stereoscopic video signal, as shown in FIG.
As shown in FIG. 12 and FIG. 12, one of the left-eye and right-eye video signals is included in the even field and the other is included in the odd field. Then, for example, when the field sequential signal of FIG. 12 is separated into the left-eye and right-eye video signals, the separated left and right video signals shown in FIG. 14 are obtained. Therefore, for example, with respect to the video signal for the right eye in FIG. 14, writing is performed on two lines of the n line and the (n + 1) line (n is a positive odd number) by the signal for one line, and the writing is sequentially performed from the first line to 2 lines. When the display is performed by scanning line by line in the vertical direction, the display image for the right eye of FIG. 5 is obtained. Similarly, with respect to the video signal for the left eye in FIG. 4, writing is performed on two lines (n + 1) line and (n + 2) line by a signal for one line, and this is sequentially scanned from the second line by two lines in the vertical direction. By performing and displaying while doing so, the display image for the left eye of FIG. 5 can be obtained. Therefore, the display is performed in the same positional relationship as the left and right display positions in the field sequential signal of FIG.
Therefore, a stereoscopic image can be displayed without causing a vertical shift in the display image for each field, which is a problem in the above-described conventional example, and without causing the display images on the left and right display devices to shift vertically.

Further, in the above-described preferred embodiment, it is determined whether the left-eye video signal and the right-eye video signal are odd fields or even fields in the field sequential stereoscopic video signal, and the result of this determination is determined. Based on the above, the display position of the image on the display device corresponding to the video signal of the even field is vertically shifted by one line from the display position of the image on the display device corresponding to the video signal of the odd field. Therefore, in the field sequential stereoscopic video signal, the display of the image on the left and right display devices is performed at the correct position regardless of whether the left and right video signals are even fields or odd fields. The display image is vertically blurred for each field, and the display image of the left and right display devices has been a problem in the above conventional example. It is prevented from appearing displaced in the vertical direction.

[0013]

【Example】

[Embodiment 1] FIG. 1 is a block diagram of a stereoscopic image display apparatus according to a first embodiment of the present invention. In the figure, the same numbers as those in FIG. 10 indicate the same components. In FIG. 1, 1 is an input terminal for inputting a stereoscopic video signal, 2 is a separation circuit for this stereoscopic video signal, 3L and 3R are signal processing circuits, 4L and 4R are drive circuits for a display device, and 6L and 6R are drive circuits. A control circuit for controlling 4L and 4R, 7
L and 7R are liquid crystal display devices (LCD). The configuration of the video signal separation circuit 2 is the same as that shown in FIG.

The operation of the stereoscopic image display device of FIG. 1 will be described. When a field sequential stereoscopic video signal is input from the input terminal 1, the stereoscopic video signal is separated by the video signal separation circuit 2 into left and right video signals. The left and right video signals separated by the video signal separation circuit 2 are input to the signal processing circuits 3L and 3R, respectively, and the drive circuits 4L and 4R.
Is input to The signal processing circuits 3L and 3R convert the input video signal into a predetermined format that can be displayed on the LCDs 7L and 7R. The drive circuits 4L and 4R output drive pulses synchronized with the input video signal to the LCDs 7L and 7R.
At this time, the timing of the drive pulse output from the drive circuits 4L and 4R is controlled by the control signals from the control circuits 6L and 6R. The contents will be described later. The video signal converted into a predetermined format by the signal processing circuits 3L and 3R and the drive pulse output from the drive circuits 4L and 4R are displayed on the LCD.
The images for the left are displayed on the LCD 7L and the images for the right are displayed on the LCD 7R by being input to 7L and 7R. At this time, by arranging the LCD 7L in a position visible only to the observer's left eye and the LCD 7R in a position visible only to the right eye, the observer can see the displayed image as a stereoscopic image.

FIG. 2 shows a configuration diagram of the LCDs 7L and 7R.
In the figure, 11 is a switching element composed of an FET, 12 is a liquid crystal cell, 13 is a storage capacitor for holding a signal charge, 14R, 14G and 14B are switching elements composed of an FET, and 15 is an output of an odd column. A shift register connected to the switching elements 14R, 14G, and 14B, 16 is a start pulse input terminal for driving the shift register 15, 17 is a drive pulse input terminal for driving the shift register 15, and 18R, 18G, and 18
B is an input terminal for video signals of primary colors (R, G, B) to pixels in odd rows, 19 is a shift register whose output is connected to the switching elements 11 in odd rows, and 20 is a start for driving the shift register 19. 21 is a pulse input terminal; 21 is a drive pulse input terminal for driving the shift register 19;
R, 22G, and 22B are switching elements composed of FETs, and 23 is a switching element 2 whose output is an even-numbered column.
Shift registers connected to 2R, 22G, 22B, 2
Reference numeral 4 is an input terminal of a start pulse for driving the shift register 23, 25 is an input terminal of a drive pulse for driving the shift register 23, and 26R, 26G, and 26B are primary colors (R, G, B) for pixels in even rows. Video signal input terminal, 27
Is a shift register whose output is connected to the switching elements 11 in even rows, 28 is a start pulse input terminal for driving the shift register 27, and 29 is a shift register 27.
A driving pulse input terminal for driving, and 30 are common electrodes of the liquid crystal cell 12.

The operation of this LCD will be described. A start pulse is input from the input terminal 16 every 1H (horizontal scanning period), and the input terminal 17 outputs m times the horizontal frequency (m
Is the number of horizontal pixels of LCD),
This drive pulse drives the m-stage shift register 15, the output pulse of this shift register is supplied to the gates of the switching elements 14R, 14G, 14B, and the switching elements 14R, 14G, 14B are sequentially turned on in the horizontal direction. By doing so, the terminals 18R, 1
Video signals input from 8G and 18B are sequentially supplied to vertical signal lines. Similarly, when a start pulse is input from the input terminal 24 for each 1H and a clock that is m times the horizontal frequency is input from the input terminal 25, the drive pulse drives the m-stage shift register 23. Output pulse is each switching element 22R, 22G, 22B
Is supplied to the gate of each switching element 22R, 22
The video signals input from the terminals 26R, 26G, and 26B are sequentially supplied to the vertical signal lines by sequentially turning on the G and 22B in the horizontal direction. For vertical signal lines,
One end of the switching element 11 is connected, and the other end of the switching element 11 is connected to the liquid crystal cell 12 and the storage capacitor 1.
Connected to 3.

Further, a start pulse is input from the input terminal 20 every 1 V (one vertical scanning period), and the input terminal 21
Therefore, when a clock of horizontal frequency is input, this driving pulse causes n stages (n is the number of vertical pixels of the liquid crystal display device, and here is the number of effective vertical scanning lines).
0) shift register 19 is driven, and its output pulse is supplied to the gate of the switching element 11 through the horizontal gate lines of the odd-numbered rows.
Is turned on, the liquid crystal cell 12 and the storage capacitor 13 are turned on.
At the same time, electric charges corresponding to the potential difference between the signals supplied to the input terminals 18R, 18G and 18B and the voltage supplied to the common electrode 30 are held. Similarly, from input terminal 28 to 1
When a start pulse is input for each V and a horizontal frequency clock is input from the input terminal 29, the n-stage shift register 27 is driven by this drive pulse, and its output pulse is passed through the even numbered horizontal gate lines. Each switching element 1 is supplied to the gate of the switching element 11.
1 is turned on, the liquid crystal cell 12 and the storage capacitor 1
3 holds electric charges corresponding to the potential difference between the signals supplied to the input terminals 26R, 26G and 26B and the voltage supplied to the common electrode 30. At this time, the common electrode 30 is supplied with a predetermined voltage.

In this embodiment, the input terminals 18R, 18G,
18B and the input terminals 26R, 26G, and 26B are supplied with the same video signal, the input terminals 16 and 24 are supplied with the same start pulse, and the input terminals 17 and 25 are supplied with the same drive pulse. Pixels in even-numbered rows are simultaneously scanned in two lines in the horizontal direction. For further vertical scanning,
This will be described in detail with reference to FIGS. 3 and 4.

FIG. 3 is a block diagram of the shift registers 19 and 27 for vertical scanning. 20 and 28 in FIG.
Is a start pulse input terminal, and 21 and 29 are drive pulse input terminals. Q1, Q2, Q3 ... Q480 are the outputs of the shift registers 19 and 27, respectively, and are connected to the pixels in the row of the subscript numbers.

FIG. 4 is a diagram showing the timing at the H rate of the start pulse and drive pulse input to the shift registers 19 and 27 and the pulse output from the shift registers 19 and 27. In the figure, the ones with the suffix R are the pulses supplied to the LCD 7R for the right eye,
Those with the suffix L are supplied to the LCD 7L for the left eye. As shown in the figure, the drive circuit 4R (FIG. 1) includes a shift register 19, a shift register 19, and a right-eye LCD 7R.
As the drive pulse of 27, a pulse for each H synchronized with the video signal is supplied to the input terminals 21 and 29. Further, as the start pulse of the shift registers 19 and 27, a pulse immediately before the horizontal synchronizing signal of the video signal of the first line to be displayed, such as the start pulse 1R and the start pulse 2R, is supplied for each 1V. Further, the drive circuit 4L is the LCD 7 for the left eye.
At L, a pulse similar to the pulse input to the drive circuit 4R is input to the input terminal 2 as a drive pulse for the shift registers 19 and 27.
1 and 29, and as the start pulse of the shift registers 19 and 27, a pulse immediately before the horizontal synchronizing signal 1H before the video signal of the first line to be displayed, such as the start pulse 1L shown, is used as the start pulse 2L. A pulse immediately before the horizontal synchronizing signal of the video signal of the first line to be displayed as described above is supplied for each 1V. By supplying such drive pulses to the left and right LCDs 7R and 7L, the pulses Q1R, Q2R, Q3R ..., Q1L, Q2L, Q3L
Are output from the shift registers 19 and 27. By supplying this pulse to the gate of the switching element 11 through the horizontal gate line, the LCDs 7R and 7L are scanned in the vertical direction.

In this way, by scanning the left and right LCDs 7R and 7L in the vertical direction with the driving pulse as shown in FIG. 4, as shown in FIG.
The signals of the first line are simultaneously written to the first and second lines of the LCD 7R, the signals of the second line are the third and fourth lines, and so on, and the signals of the first line are n lines and (n + 1) lines. 2 lines at a time are simultaneously written, and the lines are sequentially scanned from the first line in the vertical direction and displayed, and the LCD 7 for the left eye is displayed.
The signal of the first line is simultaneously written in L to the second and third lines of the LCD 7L, the signal of the second line is written in the fourth and fifth lines, ... Two lines, the line and the (n + 2) line, are simultaneously written, and the lines are sequentially scanned from the second line and displayed. However, it is an odd number of n = 1, 3, 5, ...

By doing so, the position of the display image in the vertical direction can be matched with the position at the time of image pickup, so that the display image is vertically blurred for each field, which is a problem in the conventional example. It is possible to prevent the display images on the left and right display devices from appearing to be vertically shifted.

In this embodiment, the stereoscopic video signal recorded by the field sequential system is the first as shown in FIG.
When the field is the right signal, the second field is not the left signal, the first field is the left signal, and the second field is the right signal, the left and right LCDs 7R,
The drive pulse supplied to 7L is the same as that shown in FIG. 4, and the pulse supplied to the LCD 7R for the right eye and the LCD for the left eye.
The pulse supplied to 7L may be reversed.

[Second Embodiment] FIG. 6 shows the configuration of a video signal separation circuit according to a second embodiment of the present invention. In the figure,
The same numbers as in FIG. 13 indicate the same components. In the figure, 47 is a field memory, 48 is an adder, 4
9 is a multiplier. The signal input from the input terminal 41 is delayed by 1V in the field memory 42 and input to the b terminal of the switch 45L and the a terminal of the switch 45R. The signal input from the input terminal 41 is
Further, the signals delayed by a total of 2V in the field memories 42 and 47 are added by the adder 48, and the signal is halved by the multiplier 49.
To be done. That is, take the average value of the signals of the two fields,
Input to the a terminal of the switch 45L and the b terminal of the switch 45R. Sync separation circuit 43, switch control circuit 4
4. The operations of the switches 45L and 45R are the same as those in FIG. 13. Therefore, in this embodiment, when separating the field sequential stereoscopic video signal, the missing field is replaced by the signals of the fields before and after it. Will be interpolated by the average value of. The configuration of the other parts is similar to that of the first embodiment.

By doing so, the same effect as in the first embodiment can be obtained, and the dynamic resolution can be improved by changing the interpolation of the missing field from the pre-interpolation to the average value interpolation. The effect is also obtained.

[Embodiment 3] FIG. 7 is a block diagram of a stereoscopic image display apparatus according to a third embodiment of the present invention. In the figure, the same numbers as those in FIG. 1 indicate the same components.
In the figure, 1 is a stereoscopic video signal input terminal, 2 is a stereoscopic video signal separation circuit, 3L and 3R are signal processing circuits,
4L and 4R are drive circuits of the display device, 6L and 6R
Is a control circuit for controlling the drive circuits 4L and 4R, 7L and 7R are LCDs, 51 is a sync separation circuit, 52 is a field discrimination circuit, 53 is a field memory, and 54 is a left / right discrimination circuit.

The operation of the stereoscopic image display device shown in FIG. 7 will be described. When a stereoscopic video signal is input from the input terminal 1,
The video signal separation circuit 2 separates the left and right video signals. The configuration of the video signal separation circuit 2 is similar to that of the first embodiment shown in FIG.
3 may be used, or the one shown in FIG. 6 may be used. Further, the stereoscopic video signal is sent to the sync separation circuit 5
1, the field memory 53, and the left / right discrimination circuit 54. The sync signal separated from the video signal by the sync separation circuit 51 is input to the field determination circuit 52, and it is determined whether the field of the input video signal is an odd field or an even field. Is output to the control circuits 6L and 6R. The video signal delayed by one field in the field memory 53 is input to the right / left discrimination circuit 54 together with the video signal which is not delayed. Therefore, the left and right image signals are simultaneously input to the left and right discrimination circuit 54. The left / right discriminating circuit 54 discriminates which of the left and right signals the two input signals are, and outputs the result to the control circuits 6L and 6R. Further, the left and right video signals separated by the video signal separation circuit 2 are respectively processed by the signal processing circuits 3L and 3R and the drive circuit 4.
Input to L and 4R. The signal processing circuits 3L and 3R convert the input video signal into a predetermined format that can be displayed on the LCDs 7L and 7R. The drive circuits 4L and 4R output drive pulses for the LCDs 7L and 7R synchronized with the input video signal. At this time, the control circuits 6L and 6R control the timing of drive pulses output from the drive circuits 4L and 4R based on the outputs of the field determination circuit 52 and the left / right determination circuit 54. By inputting the video signal converted into the predetermined format by the signal processing circuits 3L and 3R and the drive pulse output from the drive circuits 4L and 4R to the LCDs 7L and 7R,
An image for the left is displayed on the LCD 7L, and an image for the right is displayed on the LCD 7R. At this time, by arranging the LCD 7L in a position visible only to the observer's left eye and the LCD 7R in a position visible only to the right eye, the observer can see the displayed image as a stereoscopic image.

Next, the control of the drive circuits 4R and 4L by the control circuits 6L and 6R will be described. According to the output results of the field discrimination circuit 52 and the left / right discrimination circuit 54, as shown in FIG. 12, when the video signal for the right eye is an odd field, as shown in FIG. 4 as in the case of the first embodiment. Drive pulse with different timing, start pulse 1
R, start pulse 2R from drive circuit 4R to LCD 7R
Drive pulse, start pulse 1L, start pulse 2L from the drive circuit 4L to the LCD 7L.
Further, as shown in FIG. 8, when the video signal for the right eye is an even field, the drive pulse, the start pulse 1L, and the start pulse 2L at the timings shown in FIG. 4 are driven from the drive circuit 4R to the LCD 7R. Pulse, start pulse 1R, start pulse 2R from drive circuit 4L to L
Supply to CD7L. Such driving pulse is left and right L
When supplied to the CDs 7R and 7L, when a stereoscopic video signal as shown in FIG.
Images are displayed on the R and 7L at the positions shown in FIG.
Further, when the stereoscopic video signal as shown in FIG. 8 is supplied, the images are displayed on the left and right LCDs 7R, 7L at the positions shown in FIG.

By doing so, as in the case of the first embodiment, the vertical position of the display image can be matched with the position at the time of image pickup, so that it is possible to change the field for each field, which has been a problem in the conventional example. It is possible to prevent the display image from blurring in the vertical direction and the display images on the left and right display devices to appear to be vertically displaced, and in the field sequential stereoscopic video signal, the left and right video signals are even fields and odd fields. It is possible to obtain an effect that whichever of the fields is automatically identified and the display of the image on the left and right display devices can be displayed at the correct position.

[0030]

As described above, according to the present invention,
The display position of the image for the left eye and the display position of the image for the right eye are vertically deviated by one line and displayed at the correct position. A stereoscopic image can be displayed without blurring and the display images on the left and right display devices do not appear to shift vertically. Also, it is determined whether the left and right video signals in the input stereoscopic video signal are odd or even fields, and the display position of the image of the even field video signal is determined based on the result of the determination. Since the image is displayed vertically downward by one line with respect to the display position, in the field sequential stereoscopic video signal, the left and right video signals are either even fields or odd fields. Also, it is possible to automatically discriminate this, display the images on the left and right display devices at correct positions, and prevent image blurring and left and right image shifts for each field.

[Brief description of drawings]

FIG. 1 is a block diagram of a stereoscopic image display device using a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a liquid crystal display device used in the device of FIG.

3 is a configuration diagram of a shift register of a liquid crystal display device used in the device of FIG.

FIG. 4 is a timing diagram of driving in the apparatus of FIG.

5 is a diagram illustrating an example of an image display state in the device of FIG.

FIG. 6 is a block diagram of a video signal separation circuit used in the second and third embodiments of the present invention.

FIG. 7 is a block diagram of a stereoscopic image display device using a liquid crystal display device according to a third embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating an example of a field sequential stereoscopic video signal.

9 is a diagram illustrating an example of an image display state in the apparatus of FIG.

FIG. 10 is a block diagram of a conventional stereoscopic image display device.

FIG. 11 is a diagram illustrating a state at the time of capturing a stereoscopic video signal.

FIG. 12 is a diagram illustrating an example of a field sequential stereoscopic video signal.

FIG. 13 is a block diagram of a video signal separation circuit used in the stereoscopic image display devices according to the first and third embodiments of the present invention.

FIG. 14 is a diagram illustrating left and right video signals separated from a field sequential stereoscopic video signal.

FIG. 15 is a diagram illustrating a state of image display when a CRT is used in a conventional stereoscopic image display device.

FIG. 16 is a diagram illustrating an image display state when an LCD is used in a conventional stereoscopic image display device.

[Explanation of symbols]

1: Input terminal for stereoscopic video signal, 2: Video signal separation circuit,
3L, 3R: signal processing circuit, 4L, 4R: drive circuit, 5
L, 5R: display device, 11: switching element, 12:
Liquid crystal cell, 13: storage capacitor, 14R, 14G, 14B,
22R, 22G, 22B: switching elements, 15, 1
9, 23, 27: shift register, 16, 20, 24,
28: shift pulse start pulse input terminal, 1
7, 21, 25, 29: shift register drive pulse input terminals, 18R, 18G, 18B, 26R, 26G, 2
6B: video signal input terminal, 30: common electrode of liquid crystal cell, 41: input terminal, 42: field memory, 43:
Sync separation circuit, 44: SW control circuit, 45L, 45R:
SW circuit, 46L, 46R: output terminal, 47: field memory, 48: adder, 29: multiplier, 51: sync separation circuit, 52: field discrimination circuit, 53: field memory, 54: left / right discrimination circuit.

Claims (3)

[Claims] 1. A field sequential stereoscopic video signal,
Video signal separating means for separating the left-eye video signal and the right-eye video signal, and a video for at least one frame in the vertical direction for displaying the separated left-eye video signal at a position where only the left eye can see A first display device having pixels of the number of lines capable of displaying a signal, and at least one frame in the vertical direction for displaying the separated right-eye video signal at a position where only the right eye can see. A second display device having a number of pixels capable of displaying a video signal, wherein one of the first display device and the second display device is separated by the video signal separating means. The corresponding one of the left-eye video signal and the right-eye video signal that has been generated is divided into n lines (n +
1) Writing is performed on two lines (n is a positive odd number), and this is performed by sequentially scanning every two lines from the first line in the vertical direction to display, and the other display device displays the other lines. Regarding a video signal, writing is performed on two lines of (n + 1) line and (n + 2) line by a signal of one line, and this is performed by sequentially scanning every two lines from the second line in the vertical direction for display. A stereoscopic image display device characterized by the above. 2. A field-sequential stereoscopic video signal,
A left / right discriminating means for discriminating whether the video signal of a predetermined field is for the left eye or the right eye, and the above predetermined field of the field sequential stereoscopic video signal is an odd field or an even field. When the left-eye video signal is discriminated as an odd-numbered field by the left-right discriminating means and the field discriminating means, the first display device displays n lines by a signal for one line. And (n
+1) lines (n is a positive odd number) are written to two lines, and the writing is performed by sequentially scanning two lines from the first line in the vertical direction, and the second display device displays one line. Signal is written to two lines of (n + 1) line and (n + 2) line, and this is displayed by sequentially scanning every two lines from the second line in the vertical direction. And the field discriminating means discriminates that the video signal for the left eye is an even field, the first display device outputs a signal for one line (n +
1) line and (n + 2) line are written, and the lines are sequentially scanned by 2 lines from the 2nd line in the vertical direction and displayed, and the second display device displays 1 line of signal for n lines. 2. The stereoscopic image display device according to claim 1, wherein writing is performed on two lines of the (n + 1) line and the writing is performed while sequentially scanning two lines from the first line in the vertical direction by two lines. . 3. The first and second display devices are provided with odd line driving means for outputting a signal for driving pixels on an odd line and even line driving means for outputting a signal for driving pixels on an even line. Driving the odd line driving means and the even line driving means with the same driving signal,
The stereoscopic image display device according to claim 1, wherein writing is performed line by line.