JP3096562B2 - 3D image playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image reproducing apparatus for displaying a three-dimensional image on a liquid crystal display for displaying a two-dimensional image.

[0002]

2. Description of the Related Art First, a reproducing method for displaying a planar image on a liquid crystal display (LCD) for displaying a planar image will be described. When the input signal is a composite color signal, the composite color signal is converted into a digital signal after being separated into R, G, and B signals. Thereafter, the data is written to the liquid crystal display according to a predetermined reference clock.

FIG. 7 shows a pixel signal composed of a set of R, G, and B signals and a signal written to a dot (picture element) of a liquid crystal display. That is, the pixel signals S1, S2,... Are sequentially sent to the liquid crystal display in synchronization with the reference clock CLK, and the R, G, B signals are sequentially written to the dots of the liquid crystal display.

[0004]

It is conceivable that a barrier or a lenticular lens is provided in such a liquid crystal display (LCD) for displaying a flat image, and the liquid crystal display is used as a display device for a three-dimensional image.

When a liquid crystal display for displaying a flat image is used as a display device for a three-dimensional image, a pixel signal L for a left image and a pixel signal R for a right image are alternately sent to a liquid crystal display device in accordance with a reference clock CLK. FIG. 8 shows signals written to the dots of the liquid crystal display in the case of the above. In FIG. 8, R, G, B
Indicate signals for the right image, and R, G, and B, which are not circled, indicate signals for the left image.

In this case, since the left image signal and the right image signal do not alternate in dot units on the horizontal line of the liquid crystal display, stereoscopic viewing cannot be performed when a lenticular lens is provided on the liquid crystal display, and barriers cannot be obtained. Is provided, the color bleeding is likely to occur.

An object of the present invention is to provide a three-dimensional image reproducing apparatus capable of displaying a three-dimensional image on a liquid crystal display for displaying a two-dimensional image.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-dimensional image reproducing apparatus capable of switching between a two-dimensional image and a three-dimensional image on a liquid crystal display for displaying a two-dimensional image.

An object of the present invention is to provide a three-dimensional image reproducing apparatus capable of improving the quality of a three-dimensional image.

[0010]

A first three-dimensional image reproducing apparatus according to the present invention is a liquid crystal display device, which switches an R signal of a main image and an R signal of a sub image at a predetermined timing and sends the signal to the liquid crystal display device. First switching means, second switching means for switching the G signal of the main image and the G signal of the sub-image at the same timing as the above predetermined timing and sending the same to the liquid crystal display device, the B signal of the main image and the B signal of the sub-image Is transmitted at the same timing as the predetermined timing to the liquid crystal display device.
Each of the switching means and the switching of the main image and the sub-image by the first switching means and the third switching means are reversely performed with respect to the switching of the signal of the main image and the sub-image by the second switching means. A control means for controlling the means.

A second stereoscopic image reproducing apparatus according to the present invention comprises a liquid crystal display device, a first double-speed conversion memory for double-speed converting R, G, and B signals of a main image, and R, G, and
A second double speed conversion memory for double speed converting the B signal,
First switching means for switching the R signal of the double-speed converted main image and the R signal of the double-speed converted sub-image at a predetermined timing and sending the signal to the liquid crystal display device, the G signal of the double-speed converted main image and the double-speed conversion A second switching unit that switches the G signal of the sub-image that has been converted to the liquid crystal display device at the same timing as the predetermined timing, and transmits the B signal of the double-speed converted main image and the B signal of the double-speed converted sub image. Switching means for switching the main image and the sub-image by the second switching means for switching the main image and the sub-image by the second switching means at the same timing as the predetermined timing. And control means for controlling each switching means so that the switching of the signal of the main image and the signal of the sub-image is reversed.

Assuming that a writing frequency of a set of R, G, and B signals to the liquid crystal display device is a reference frequency, a writing frequency and a reading frequency of the first double-speed conversion memory and the second double-speed conversion memory are as follows. For example, it is set as follows.

(I) Writing frequency: 1/4 of the reference frequency
Read frequency: 1/2 frequency clock of reference frequency (ii) Write frequency: 1/2 frequency of reference frequency Read frequency: same frequency as reference frequency

A third three-dimensional image reproducing apparatus according to the present invention is a liquid crystal display device, a display mode switching means for switching a display mode of the liquid crystal display device between a two-dimensional image display mode and a three-dimensional image display mode, an R signal of a main image, A first switching unit that switches the R signal of the image at a predetermined timing and sends the signal to the liquid crystal display device, and converts the G signal of the main image and the G signal of the sub image into
A second switching means for switching the signal at the same timing as the predetermined timing and transmitting the signal to the liquid crystal display device, and for switching the B signal of the main image and the B signal of the sub image at the same timing as the predetermined timing and transmitting the signal to the liquid crystal display device; 3 switching means, when the display mode is the stereoscopic image display mode, the switching of the main image and the sub-image signals by the second switching means and the switching of the signals of the main image and the sub-image by the first switching means and the third switching means. First control means for controlling each switching means so that the switching is reversed; and second control means for controlling each switching means to select the main image when the display mode is the planar image display mode.
It is characterized by having control means.

A fourth stereoscopic image reproducing apparatus according to the present invention is a liquid crystal display device, a display mode switching means for switching a display mode of the liquid crystal display device between a planar image display mode and a stereoscopic image display mode, and R, G, and First double-speed conversion memory for double-speed conversion of B signal, R, G, B of sub-image
A second double-speed conversion memory for double-speed conversion of a signal, a first double-speed conversion R signal of a main image and a double-speed conversion of a sub-image R signal of a sub-image converted at a predetermined timing and transmitted to a liquid crystal display device; Switching means for switching the G signal of the double-speed-converted main image and the G signal of the double-speed converted sub-image at the same timing as the predetermined timing and sending the same to the liquid crystal display device; A third signal to be transmitted to the liquid crystal display device by switching between the B signal of the image and the B signal of the double-speed converted sub-image at the same timing as the predetermined timing.
When the switching unit and the display mode are the stereoscopic image display mode, the switching of the main image and the sub image by the first switching unit and the third switching unit is performed in response to the switching of the main image and the sub image by the second switching unit. First control means for controlling each switching means so that the reverse is effected, and second control means for controlling each switching means to select the main image when the display mode is the planar image display mode. It is characterized by the following.

Assuming that a writing frequency of a set of R, G, B signals to the liquid crystal display device is a reference frequency, a writing frequency and a reading frequency of the first double-speed conversion memory and the second double-speed conversion memory are as follows. For example, it is set as follows.

(I) Writing frequency: 1/4 of the reference frequency
Read frequency: 1/2 frequency clock of reference frequency (ii) Write frequency: 1/2 frequency of reference frequency Read frequency: same frequency as reference frequency

Assuming that the writing frequency of each set of R, G, B signals to the liquid crystal display device is a reference frequency, the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory is 1/1 of the reference frequency. A first double-speed conversion mode in which the read frequency of the first double-speed conversion memory and the second double-speed conversion memory is half the reference frequency; The second double-speed conversion memory has a write frequency of half the reference frequency, and the first double-speed conversion memory and the second double-speed conversion memory have the same read frequency as the reference frequency. A double speed conversion mode switching means for switching between the double speed conversion mode and the double speed conversion mode may be provided.

When the display frequency is the flat image display mode, and the writing frequency of the set of R, G, and B signals to the liquid crystal display device is set as the reference frequency, the first double speed conversion memory and the second double speed The first double speed in which the writing frequency of the conversion memory is １ ／ of the reference frequency and the reading frequency of the first double speed conversion memory and the second double speed conversion memory is １ ／ of the reference frequency The conversion mode and the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory are half the reference frequency, and the first double-speed conversion memory and the second double-speed conversion memory Double speed conversion mode switching means for switching between the second frequency conversion mode in which the read frequency is the same as the reference frequency may be provided.

When the display mode is the stereoscopic image display mode and the writing frequency of a set of R, G, and B signals to the liquid crystal display device is set as a reference frequency, the first double speed conversion memory and the second double speed The first double speed in which the writing frequency of the conversion memory is １ ／ of the reference frequency and the reading frequency of the first double speed conversion memory and the second double speed conversion memory is １ ／ of the reference frequency The conversion mode and the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory are half the reference frequency, and the first double-speed conversion memory and the second double-speed conversion memory Double speed conversion mode switching means for switching between the second frequency conversion mode in which the read frequency is the same as the reference frequency may be provided.

[0021]

In the first three-dimensional image reproducing apparatus according to the present invention,
The R signal of the main image and the R signal of the sub image are switched at a predetermined timing by the first switching unit and sent to the liquid crystal display device. Further, the G signal of the main image and the G signal of the sub image are switched by the second switching unit at the same timing as the predetermined timing and sent to the liquid crystal display device. Also, the B signal of the main image and the B signal of the sub image
Switching is performed by the switching unit at the same timing as the predetermined timing and transmitted to the liquid crystal display device.

Each switching means switches the signal of the main image and the sub-image by the first switching means and the third switching means in reverse to the switching of the signal of the main image and the sub-image by the second switching means. Is controlled.

In the second three-dimensional image reproducing apparatus according to the present invention, the R, G, and B signals of the main image are double-speed converted. Also,
The R, G, and B signals of the sub-image are double-speed converted.

The R signal of the double-speed converted main image and the R signal of the double-speed converted sub-image are switched at a predetermined timing by the first switching means and sent to the liquid crystal display device. The G signal of the main image subjected to the double speed conversion and the G signal of the sub image subjected to the double speed conversion are switched by the second switching means at the same timing as the predetermined timing and sent to the liquid crystal display device. The B signal of the main image subjected to the double speed conversion and the B signal of the sub image subjected to the double speed conversion are switched by the third switching means at the same timing as the predetermined timing and sent to the liquid crystal display device.

Each switching means switches the signal of the main image and the sub-image by the first switching means and the third switching means in reverse to the switching of the signal of the main image and the sub-image by the second switching means. Is controlled.

In the third stereoscopic image reproducing apparatus according to the present invention, the R signal of the main image and the R signal of the sub image are switched at a predetermined timing by the first switching means and sent to the liquid crystal display device. Also, the G signal of the main image and the G signal of the sub image
The signal is switched by the second switching means at the same timing as the predetermined timing and sent to the liquid crystal display device. The B signal of the main image and the B signal of the sub image are
The switching is performed by the third switching unit at the same timing as the predetermined timing, and is transmitted to the liquid crystal display device.

When the display mode is the stereoscopic image display mode, switching of the main image and sub-image signals by the first switching unit and the third switching unit is performed in response to switching of the main image and sub-image signals by the second switching unit. Each switching means is controlled such that is reversed. When the display mode is the planar image display mode, each switching unit is controlled so as to select the main image.

In the fourth three-dimensional image reproducing apparatus according to the present invention, the R, G, and B signals of the main image are double-speed converted. Also,
The R, G, and B signals of the sub-image are double-speed converted.

The R signal of the main image subjected to the double speed conversion and the R signal of the sub image subjected to the double speed conversion are switched at a predetermined timing by the first switching means and sent to the liquid crystal display device. The G signal of the main image subjected to the double speed conversion and the G signal of the sub image subjected to the double speed conversion are switched by the second switching means at the same timing as the predetermined timing and sent to the liquid crystal display device. The B signal of the main image subjected to the double speed conversion and the B signal of the sub image subjected to the double speed conversion are switched by the third switching means at the same timing as the predetermined timing and sent to the liquid crystal display device.

When the display mode is the stereoscopic image display mode, the switching between the main image and the sub-image signals by the first switching unit and the third switching unit is performed in response to the switching of the main image and the sub-image signals by the second switching unit. Each switching means is controlled such that is reversed. When the display mode is the planar image display mode, each switching unit is controlled so as to select the main image.

[0031]

FIG. 1 shows the configuration of a color stereoscopic image reproducing apparatus.

In this color stereoscopic image reproducing apparatus, an LCD (liquid crystal display) module 10 for displaying a planar image used in a personal computer or the like is used as a display device. As the LCD module 10, a VGA (Vide
o Graphics Array) specifications are used, with 640 pixels (= 640 × 3 = 1920 dots) in the horizontal direction and 480 pixels (480 dots) in the vertical direction.
Each dot is provided with a field effect transistor and red, green and blue color filters. The LCD module 10 has a digital driver. The display modes of the LCD module 10 include a flat image display mode,
There is a stereoscopic image display mode.

The LCD module 10 is provided with an active barrier, which is a barrier for stereoscopic vision and can switch between a barrier effective mode and a barrier release mode. Normally, the active barrier is set to the barrier effective mode.

This stereoscopic image reproducing apparatus has a main image input terminal PL and a sub image input terminal PR. In the case of the planar image display mode, the image signal is transmitted to the main image input terminal PL.
Is input to In the case of the stereoscopic image display mode, the left image signal is input to the main image input terminal PL, and the right image signal is input to the sub image input terminal PR. In this example, it is assumed that the input image signal is a composite color signal of the NTSC system.

[1] Description of the operation when the display mode is the stereoscopic image display mode. Double speed conversion memory 3,
6, the writing frequency (signal a) and the double-speed conversion memory 3,
The three-dimensional image display mode is divided into a first three-dimensional image display mode and a second three-dimensional image display mode depending on the relationship with the readout frequency (signal b) of No. 6.

[1-1] Operation in the first three-dimensional image display mode will be described. FIG. 2 shows signals of each unit in the first stereoscopic image display mode.

The left image signal input to the left image input terminal PL is sent to the video signal processing circuit 1 and to the sync separation circuit 11. In the video signal processing circuit 1, the left image signal is separated into R, G, B (red, green, blue) signals. In the sync separation circuit 11, a sync signal is extracted from the left image signal. The synchronization signal extracted by the synchronization separation circuit 11 is sent to the timing signal generation circuit 12. The timing signal generation circuit 12 outputs timing signals a to f. The timing signal f is a decoded synchronization signal S including the horizontal and vertical synchronization signals extracted by the synchronization separation circuit 11.
YNC.

The R, G, and B signals of the left image output from the video signal processing circuit 1 are sent to an A / D conversion circuit 2 and converted into 8-bit digital R, G, and B signals, respectively. . In FIG. 2, R, G, B for each sampling
A set of signals is represented by L1, L2,.

The sampling clock (signal a) of the A / D conversion circuit 2 is based on a writing clock for one pixel (3 dots) in the horizontal direction of the LCD module 10 as a reference clock CLK.
(Signal e), the frequency of the reference clock CLK is 1
/ 4 signal CLK / 4. Therefore, the R, G, and B signals output from the video signal processing circuit 1 are sampled every four times the period of the reference clock CLK. The sampling points are shown as odd numbers in FIG.
Indicated by ...

The R, G, B signals (L1, L2...) Sampled by the A / D conversion circuit 2 are written to the double speed conversion memory 3. The write clock (signal a) of the double-speed conversion memory 3 is 1 / frequency of the reference clock CLK.
4, and the read clock (signal b) is a signal CLK / 2 having a half frequency of the reference clock CLK.

Therefore, the R, G, B signals (L1, L2...) Written in the double speed conversion memory 3 are read out from the double speed conversion memory 3 at twice the speed. However, from the double-speed conversion memory 3, R,
The G and B signals (L1, L2...) Are read. From the double-speed conversion memory 3, signals for the same one horizontal period are
It is read out twice in succession.

R output from the double speed conversion memory 3
Of the G and B signals, the R signal is sent to the input terminal IB of the R multiplexer 7. The G signal output from the double speed conversion memory 3 is sent to the input terminal IA of the G multiplexer 8. The B signal output from the double speed conversion memory 3 is B
To the input terminal IB of the multiplexer 9 for use.

The right image signal input to the right image input terminal PR is sent to the video signal processing circuit 4. In the video signal processing circuit 4, the right image signal is separated into R, G, and B signals.

The R, G, and B signals of the right image output from the video signal processing circuit 4 are sent to an A / D conversion circuit 5 and converted into 8-bit digital R, G, and B signals, respectively. . In FIG. 2, R, G, B for each sampling
A set of signals is represented by R1, R2,.

The sampling clock (signal a) of the A / D conversion circuit 5 is a signal CLK / 4 having a frequency 1/4 of the frequency of the reference clock CLK. Therefore, the R, G, and B signals output from the video signal processing circuit 4 are sampled every four times the period of the reference clock CLK.

The R, G, B signals (R1, R2...) Sampled by the A / D conversion circuit 5 are written to the double speed conversion memory 6. The write clock (signal a) of the double-speed conversion memory 6 is 1 / frequency of the reference clock CLK.
4, and the read clock (signal b) is a signal CLK / 2 having a half frequency of the reference clock CLK.

Therefore, the R, G, B signals (R1, R2...) Written in the double speed conversion memory 6 are read out from the double speed conversion memory 6 at twice the speed. However, from the double-speed conversion memory 6, R,
The G and B signals (R1, R2...) Are read. Also, from the double speed conversion memory 6, the signal for the same one horizontal period is
It is read out twice in succession.

R output from the double speed conversion memory 6
Of the G and B signals, the R signal is sent to the input terminal IA of the R multiplexer 7. The B signal output from the double speed conversion memory 6 is sent to the input terminal IA of the B multiplexer 9. The G signal output from the double speed conversion memory 6 is G
To the input terminal IB of the multiplexer 8.

In the case of the stereoscopic image display mode, the control input terminal SEL of each of the multiplexers 7, 8, and 9 has a signal CL having a frequency half the frequency of the reference clock CLK.
K / 2 (signals c and d) is input. Each of the multiplexers 7, 8, 9 selects and outputs the input of the input terminal IB when the signals c and d input to the control input terminal SEL are at the H level, and outputs the signals c and d input to the control input terminal SEL.
Is low, the input of the input terminal IA is selected and output. Therefore, each multiplexer 7, 8, 9
The input signal is switched and output at the same cycle as the reference clock.

As shown in FIG. 2, signals c and d (CLK /
When 2) is at the H level, the R multiplexer 7
And the multiplexer 9 for B outputs the R signal and the B signal of the left image, and the multiplexer 8 for G outputs the G signal of the right image. That is, when the signals c and d are at the H level, the R signal and B signal of the left image and the G signal of the right image are sent to the LCD module 10 and
The data is written to the D module 10.

Conversely, when the signals c and d (CLK / 2) are at the L level, the R and B signals of the right image are output from the R multiplexer 7 and the B multiplexer 9, and the G multiplexer 8 outputs the right image. Outputs the G signal of the left image. That is, when the signals c and d are at the L level, the G signal of the left image and the R and B signals of the right image are sent to the LCD module 10 and written into the LCD module 10.

The data written to each dot of the LCD module 10 is as shown in FIG. Here, data R, G, and B surrounded by circles indicate data of the right image, and data R, G, and B not surrounded by circles indicate data of the left image. As can be seen from FIG. 2, the data of the left image and the data of the right image are alternately written in dot units in each horizontal line, so that stereoscopic viewing is possible.

The sampling numbers of the R, G, and B signals written in the LCD module 10 are 11, 1, 33, 3,... As shown in FIG.

[1-2] The operation in the second stereoscopic image display mode will be described. FIG. 3 shows signals of respective units in the second stereoscopic image display mode.

In the second three-dimensional image display mode, the sampling clock (signal a) of each of the A / D conversion circuits 2 and 5 is a clock CLK / 2 having a half frequency of the reference clock CLK. Further, the write clock (signal a) of each of the double-speed conversion memories 3 and 6 is a clock CLK / 2 having a frequency half the frequency of the reference clock CLK, and the read clock (signal b) is a clock CLK of the reference clock CLK. The clock CLK has the same frequency as the frequency.

In the second three-dimensional image display mode, FIG.
As shown in (1), the R, G, and B signals output from the video signal processing circuits 1, 4 are sampled by the A / D conversion circuits 2, 5 at twice the period of the reference clock CLK. The sampling points are indicated by.
The odd-numbered sampling points correspond to the sampling points in FIG.

The R, G and B signals written in the double speed conversion memories 3 and 6 are read out from the double speed conversion memories 3 and 6 at double speed. However, from each of the double-speed conversion memories 3 and 6, R, G, and B are delayed by 1/2 horizontal period.
The signal is read. In addition, each of the double speed conversion memories 3 and 6
, The signal for the same one horizontal period is successively read twice.

The outputs of the multiplexers 7, 8, and 9 and the data written to each dot of the LCD module 10 are as shown in FIG. Here, data R, G, and B surrounded by circles indicate data of the right image, and data R, G, and B not surrounded by circles indicate data of the left image. FIG.
As can be understood from the above, in each horizontal line, the data of the left image and the data of the right image are alternately written in dot units, so that stereoscopic viewing is possible.

The sampling numbers of the R, G, and B signals written in the LCD module 10 are 11, 12, 33, 4,... As shown in FIG.

In the first stereoscopic image display mode, the sampling numbers of the R, G, and B signals written to the LCD module 10 are 11, 11, 3 as shown in FIG.
3,3 ... That is, the R, B, and G signals at the same sampling point in the left image are written every other dot in the horizontal direction. Similarly, R, B, and G signals at the same sampling point in the right image are written every other dot in the horizontal direction.

On the other hand, in the second stereoscopic image display mode, the R and B signals of the same sampling point of the left image are written every other dot, and one dot is added to this B signal at the next sampling point of the left image. The G signal has been written. Similarly, the R and B signals at the same sampling point in the right image are written every other dot,
In this B signal, the G signal of the next sampling point of the right image in one dot is written. In other words, LCD
On the module 10, the phase of the G signal is shifted with respect to the R and B signals in each of the left and right images.

In the three-dimensional image mode, the horizontal resolution is halved as compared with the two-dimensional image mode, so that oblique lines are more likely to appear in a stepwise manner. In the second stereoscopic image display mode, LC
On the D module 10, the left and right images have different phases of the G signal with respect to the R and B signals.

[2] Description of operation when display mode is flat image display mode In the case of the planar image display mode, the image signal is input to the main image input terminal PL. Therefore, the input image signal is separated by the video signal processing circuit 1 into R, G, and B signals. The R, G, and B signals output from the video signal processing circuit 1 are converted into digital signals by the A / D conversion circuit 2 and then sent to the double-speed conversion memory 3.

The R signal read from the double speed conversion memory 3 is sent to the input terminal IB of the R multiplexer 7. The B signal read from the double speed conversion memory 3 is B signal
To the input terminal IB of the multiplexer 9 for use. The G signal read from the double speed conversion memory 3 is sent to the input terminal IA of the G multiplexer 8.

The signal d sent to the control input terminals SEL of the R multiplexer 7 and the B multiplexer 9 is held at H level so that the input terminal IB is always selected. The signal c sent to the control input terminal SEL of the G multiplexer 8 is set to L so that the input terminal IA is always selected.
Retained on level.

Depending on the relationship between the writing frequency (signal a) of the double-speed conversion memories 3 and 6 and the reading frequency (signal b) of the double-speed conversion memories 3 and 6, the two-dimensional image display mode is set to the first two-dimensional image display mode. And a second plane image display mode.

[2-1] The operation in the first plane image display mode will be described. FIG. 4 shows signals of the respective units in the first planar image display mode.

In the first plane image display mode, the sampling clock (signal a) of the A / D conversion circuit 2 is a clock CLK having a frequency １ ／ of the frequency of the reference clock CLK.
/ 4. The write clock (signal a) of the double-speed conversion memory 3 is 、 of the frequency of the reference clock CLK.
, And the read clock (signal b) is １ ／ of the frequency of the reference clock CLK.
The clock CLK / 2 has a frequency of

In the first plane image display mode, FIG.
As shown in (1), the R, G, and B signals output from the video signal processing circuit 1 are sampled by the A / D conversion circuit 2 every four times the period of the reference clock CLK. The sampling points are indicated by odd numbers,.

The R, G, B signals written to the double speed conversion memory 3 are read out of the double speed conversion memory 3 at twice the speed. However, 1 from the double speed conversion memory 3
The R, G, and B signals are read out with a delay of / 2 horizontal periods.
From the double speed conversion memory 3, the signal for the same one horizontal period is read twice consecutively.

The outputs of the multiplexers 7, 8, and 9 and the data written to each dot of the LCD module 10 are as shown in FIG. The sampling numbers of the R, G, and B signals written in the LCD module 10 are 111, 111, 333, 333,... As shown in FIG. In this case, since the data at the same sampling point is written twice consecutively in the horizontal direction, even if the active barrier is set to the barrier release mode, the horizontal resolution becomes １ ／.

[2-2] The operation in the second plane image display mode will be described. FIG. 5 shows signals of each unit in the second plane image display mode.

In the second plane image display mode, the active barrier is set to the barrier release mode. In the second planar image display mode, the sampling clock (signal a) of the A / D conversion circuit 2 is a clock CLK / 2 having a frequency half the frequency of the reference clock CLK. In addition, the write clock (signal a) of the double-speed conversion memory 3 is a clock CLK / 2 having a frequency half the frequency of the reference clock CLK.
And the read clock (signal b) is a clock CLK having the same frequency as the frequency of the reference clock CLK.

In the second plane image display mode, FIG.
As shown in (1), the R, G, and B signals output from the video signal processing circuit 1 are sampled by the A / D conversion circuit 2 at every twice the period of the basic clock CLK. The sampling points are indicated by. The odd-numbered sampling points correspond to the sampling points in FIG.

The R, G, and B signals written to the double speed conversion memory 3 are read out of the double speed conversion memory 3 at double speed. However, 1 from the double speed conversion memory 3
The R, G, and B signals are read out with a delay of / 2 horizontal periods.
From the double speed conversion memory 3, the signal for the same one horizontal period is read twice consecutively.

The outputs of the multiplexers 7, 8, and 9 and the data written to each dot of the LCD module 10 are as shown in FIG. The sampling numbers of the R, G, and B signals written in the LCD module 10 are, for example, 111, 222, 333, 444,... As shown in FIG. Therefore, in this case, the resolution 1
Is obtained.

As shown in FIG. 6, the R, G, and B signals output from each of the double-speed conversion memories 3 and 6 are provided after the double-speed conversion memories 3 and 6 of the color stereoscopic reproduction apparatus of FIG. May be provided to reduce the number of bits without impairing the number of gradations. Examples of the multi-gradation processors 21 and 22 include those using an error diffusion processing technique for performing multi-value conversion using a corrected density signal obtained by adding multi-value errors of peripheral pixels in a frame and the same pixel between frames. Used (eg, "Mulch-Gray-Level Metho
d for TFT-LCD Using Enhanced Error Diffusion "SID
93 Digest, p.475-478 (1993) or "VIII TV LC
Circuit Technology of D "Lecture Meeting of the Kansai Branch of the Institute of Electrical Engineers of Japan, p.49-56
(See 1993, 10, 29).

In FIG. 6, each of the multiple gradation processors 21, 2
As 2, a 8-bit R, G, B signal input from the double-speed conversion memories 3, 6 is converted into a 3- or 4-bit signal without losing the number of gradations.
The clock (signal g) for the multi-grayscale processors 21 and 22 is a clock CLK / 2 having a half frequency of the reference clock CLK.

In the above embodiment, in the multiplexer 7 for R and the multiplexer 9 for B, the left image signal is input to the input terminal IB and the right image signal is input to the input terminal IA. In the multiplexer 8, the left image signal is input to the input terminal IA and the right image signal is input to the input terminal IB.
Input signal to the input terminal IB of the left image.
The signal of the right image may be input to A. However, in this case, it is necessary to reverse the phases of the signal c and the signal d in the stereoscopic image display mode. In this case, it is necessary to set the signal c to the H level in the plane image display mode, similarly to the signal d.

In the above embodiment, the LCD module 10 is provided with an active barrier. However, a normal barrier or a lenticular lens for stereoscopic viewing may be provided on the LCD module 10.
The module 10 may be provided. However, when a normal barrier or lenticular lens is provided in the LCD module 10, the resolution is reduced to １ ／ even in the second planar image display mode.

The write frequency (signal a) and read frequency (signal b) of the double speed conversion memories 3 and 6 are as follows.
If the ratio of the read frequency to the write frequency is 2, it is possible to use a frequency different from the frequency shown in the above embodiment.

[0082]

According to the first or second stereoscopic image reproducing apparatus according to the present invention (the stereoscopic image reproducing apparatus according to claim 1 or 2), a liquid crystal display for displaying a planar image has
A stereoscopic image can be displayed.

According to the third or fourth stereoscopic image reproducing device according to the present invention (the three-dimensional image reproducing device according to the third or fourth aspect), the liquid crystal display for displaying a two-dimensional image has:
Switching between a two-dimensional image and a three-dimensional image can be displayed.

According to the three-dimensional image reproducing apparatus of the sixth, seventh or eighth aspect of the present invention, it is possible to improve the image quality of a three-dimensional image.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating a configuration of a stereoscopic image reproducing device.

FIG. 2 is a time chart showing signals of respective units in a first stereoscopic image display mode.

FIG. 3 is a time chart showing signals of respective units in a second stereoscopic image display mode.

FIG. 4 is a time chart showing signals of respective units in a first planar image display mode.

FIG. 5 is a time chart showing signals of respective units in a second planar image display mode.

FIG. 6 is a circuit block diagram illustrating a configuration of another stereoscopic image reproducing device.

FIG. 7 is a time chart showing signals written to dots of the liquid crystal display when a flat image is displayed on the liquid crystal display for displaying a flat image.

FIG. 8 shows a case where a liquid crystal display for displaying a two-dimensional image is used as a display device for a three-dimensional image, and pixel signals L for the left image and pixel signals R for the right image are alternately sent to the liquid crystal display device according to a reference clock. 6 is a time chart showing signals written to dots of a liquid crystal display in the case of the above.

[Explanation of symbols]

 1, 4 Video signal processing circuit 2, 5 A / D conversion circuit 3, 6 Double speed conversion memory 7, 8, 9 Multiplexer 10 LCD module 11 Synchronization separation circuit 12 Timing signal generation circuit

Claims (9)

(57) [Claims] 1. A liquid crystal display device, first switching means for switching between an R signal of a main image and an R signal of a sub image at a predetermined timing and sending the signal to the liquid crystal display device, a G signal of a main image and a G signal of a sub image. Switching means for switching the B signal of the main image and the B signal of the sub image at the same timing as the predetermined timing. The switching of the signal of the main image and the sub-image by the first switching unit and the third switching unit is reversed with respect to the switching of the main image and the sub-image by the third switching unit and the second switching unit. A stereoscopic image reproducing apparatus comprising: a control unit that controls each switching unit as described above. 2. A liquid crystal display device, a first double-speed conversion memory for double-speed conversion of R, G, B signals of a main image, and a second double-speed conversion memory for double-speed conversion of R, G, B signals of a sub-image. A double speed conversion memory, first switching means for switching the R signal of the double speed converted main image and the R signal of the double speed converted sub image at a predetermined timing and sending the same to the liquid crystal display device, Second switching means for switching the G signal and the G signal of the double-speed converted sub-image at the same timing as the predetermined timing and sending the same to the liquid crystal display device; A third switching means for switching the B signal of the image to the liquid crystal display device at the same timing as the predetermined timing, and a first switching for switching the signal of the main image and the sub-image by the second switching means. Means and third switch A control means for controlling each switching means so that the switching of the signal of the main image and the signal of the sub-image by the stage is reversed. 3. A liquid crystal display device, a display mode switching means for switching a display mode of the liquid crystal display device between a planar image display mode and a stereoscopic image display mode, and an R signal of a main image and an R signal of a sub image at a predetermined timing. A first switching means for switching the G signal of the main image and a G signal of the sub-image at the same timing as the above-mentioned predetermined timing and transmitting the same to the liquid crystal display device; A third switching means for switching between the B signal and the B signal of the sub-image at the same timing as the above-mentioned predetermined timing and sending the same to the liquid crystal display device; For the switching of the image signal, the first
First control means for controlling each switching means so that the switching of the main image and sub-image signals by the switching means and the third switching means is reversed; and when the display mode is the plane image display mode, each switching means A stereoscopic image reproducing apparatus comprising: a second control unit configured to perform control to select a main image. 4. A liquid crystal display device, a display mode switching means for switching a display mode of the liquid crystal display device between a two-dimensional image display mode and a three-dimensional image display mode, and a first mode for double-speed converting R, G, and B signals of a main image. A second double-speed conversion memory for double-speed conversion of the sub-image R, G, and B signals; a double-speed converted main image R signal and a double-speed converted sub-image R signal A first switching means for switching at a predetermined timing and sending the signal to the liquid crystal display device, and switching between the G signal of the double-speed-converted main image and the G signal of the double-speed converted sub-image at the same timing as the predetermined timing. A second switching means for sending to the display device, a third switching for switching between the B signal of the double-speed converted main image and the B signal of the double-speed converted sub-image at the same timing as the predetermined timing, and sending to the liquid crystal display device When the display mode is the stereoscopic image display mode, the first switching is performed in response to the switching of the main image and the sub image signals by the second switching unit.
First control means for controlling each switching means so that the switching of the main image and sub-image signals by the switching means and the third switching means is reversed; and when the display mode is the plane image display mode, each switching means A stereoscopic image reproducing apparatus comprising: a second control unit configured to perform control to select a main image. 5. A writing frequency of a set of R, G, B signals to a liquid crystal display device as a reference frequency, the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory is the reference frequency. 5. The stereoscopic image according to claim 2, wherein the frequency is の, and the readout frequency of the first double-speed conversion memory and the second double-speed conversion memory is １ ／ of the reference frequency. 6. Playback device. 6. When a writing frequency of a set of R, G, B signals to the liquid crystal display device is set as a reference frequency, the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory is set to the reference frequency. 5. The read frequency of the first double-speed conversion memory and the second double-speed conversion memory is the same frequency as the reference frequency.
The stereoscopic image reproducing device according to any one of the above. 7. When the writing frequency of a set of R, G, B signals to the liquid crystal display device is set as a reference frequency, the writing frequency of the first double-speed conversion memory and the second double-speed conversion memory is the reference frequency. A first double-speed conversion mode in which the reading frequency of the first double-speed conversion memory and the second double-speed conversion memory is 周波 数 of the reference frequency; The write frequency of the memory and the second double-speed conversion memory is half the reference frequency, and the read frequency of the first double-speed conversion memory and the second double-speed conversion memory is the same frequency as the reference frequency. 5. The stereoscopic image reproducing apparatus according to claim 4, further comprising a double speed conversion mode switching means for switching between the second double speed conversion mode and the second double speed conversion mode. 8. A first double-speed conversion memory and a second double-speed conversion memory, wherein a writing frequency of a set of R, G, and B signals to the liquid crystal display device is set as a reference frequency when the display mode is the flat image display mode. The writing frequency of the double speed conversion memory is 1/4 of the reference frequency, and the read frequency of the first double speed conversion memory and the second double speed conversion memory is 1/2 the reference frequency. In the 1x speed conversion mode, the writing frequency of the first 2nd speed conversion memory and the 2nd speed conversion memory is 1/2 of the reference frequency, and the 1st speed conversion memory and the 2nd speed conversion memory 5. The stereoscopic image reproducing apparatus according to claim 4, further comprising a double speed conversion mode switching means for switching between a second double speed conversion mode in which a read frequency of the memory is the same as the reference frequency. 9. A first double-speed conversion memory and a second double-speed conversion memory, wherein a writing frequency of a set of R, G, and B signals to the liquid crystal display device is set as a reference frequency when the display mode is a stereoscopic image display mode. The writing frequency of the double speed conversion memory is 1/4 of the reference frequency, and the reading frequency of the first double speed conversion memory and the second double speed conversion memory is 1/2 the reference frequency. In the 1 × speed conversion mode, the writing frequency of the first double speed conversion memory and the second double speed conversion memory is １ ／ of the reference frequency, and the first double speed conversion memory and the second double speed conversion memory 5. The stereoscopic image reproducing apparatus according to claim 4, further comprising a double speed conversion mode switching means for switching between a second double speed conversion mode in which a memory read frequency is the same as the reference frequency.