JPH03109596A - Single plate liquid crystal display device - Google Patents

Abstract

PURPOSE:To reproduce a highly precise color image by writing data on single color liquid crystal panels for each unit of R, G and B primary chrominance signals that a video signal is demodulated and lighting three R, G, and B light sources in synchronism with the timing of when these primary chrominance signals are written. CONSTITUTION:A chroma circuit 2 demodulates the R, G, and B primary chrominance signals and temporarily stores the demodulated ones in the memory circuits 52a, 52b, and 52c of a digital delay circuit 5 for each unit of R, G, and B primary chrominance signals. Then, a circuit 5 sequentially reads out the R, G, and B primary chrominance signals for each color, and a polarity alternating circuit 6 periodically switches the polarity of the primary chrominance signal and supplies them to the liquid crystal panel 7. In the liquid crystal panel 7, a red image is written according to the input sequence of red chrominance signal, a green image is written according to the input sequence of green chrominance signal, and finally a blue image is written according to the input sequence of blue chrominance signal. On the other hand, in the three-color light source 8, a red light source 81 is lighted when the red primary chrominance signal is completely written on the liquid crystal panel 7, a green light source 82 is lighted when the green primary chrominance signal is completely written, and a blue light source 83 is lighted when the blue primary chrominance signal is completely written. Thus, a highly precise color image is reproduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display device that uses a light source to display images on a liquid crystal panel, and particularly relates to a liquid crystal display device that uses a light source to display images on a liquid crystal panel, and particularly to a liquid crystal display device that uses a single-panel liquid crystal panel to display high-definition color images. The present invention relates to a liquid crystal color display device suitable for displaying.

[Conventional technology]

Televisions using liquid crystal panels are known as ``television technology.''

It has the structure and operation described on pages 19 to 25 of "March 1989 issue". Similar to a normal shadow mask type or index type cathode ray tube, a liquid crystal panel reproduces dots (pixels) for each RGB color, and displays a single color image by composing five of them.

For example, in a liquid crystal panel with pixels of 480 dots horizontally x 240 dots vertically, each pixel is 160 dots horizontally x 2 pixels vertically.
Reproducing an RGB monochrome image with 40 dots of pixels, these 3
A color image is reproduced by combining two RGB monochrome screens into one image.

[Problem to be solved by the invention]

The conventional method has a problem in that when a monochrome image is displayed on a color panel, the resolution is reduced to one-third of that of a monochrome panel with the same number of pixels.

In other words, if we take as an example a panel with a vertical stripe color filter arrangement and the number of pixels is 480 dots horizontally x 240 dots vertically, the horizontal resolution when displaying black and white vertical stripes is 160 pixels.
It will become a TV book.

Resolution is an important item in evaluating display image quality, and improving resolution has become a technical issue in recent televisions where high image quality is desired. In order to improve the resolution of LCD panels, for example, "TV technology.

As described on pages 91 to 95 of the November 1988 issue, (1) finer panels, (2) optimal design of filter placement to match the displayed image content, and (5) RGB-dedicated panels. Conventionally, we have used a 5-disk projection method for image reproduction, in which images are superimposed. However, (1) increases the price of the panel because the yield of the panel decreases, and (2) increases the resolution because there are limits to horizontal and vertical resolution within the resolution range determined by the number of pixels. There is a natural limit to method (3), which improves the resolution by about 5 times, but
There is a problem that the price of the set is very high due to the large number of copies used.

An object of the present invention is to improve the resolution of a color image display device, and particularly to realize a low-cost, high-quality flat color TV.

[Means to solve the problem]

In order to achieve the above purpose, (1) decomposes the video signal into KGB primary color signals, (2) memory stores each decomposed primary color signal, and (6) counts each memorized primary color signal once per field. Read out 5 times, (4) Write each read color and fc a total of 3 times in one field, (5) Switch the color of the pixel on the panel according to the writing timing of each primary color signal, and Play color images.

As an example, using a transmissive monochrome panel such as an LCD, first write information on the R primary color signal to the panel, then write information on the G primary color signal to the panel, and finally write information on the B primary color signal to the panel. . That is, image information is written into each pixel six times in one field in a frame-sequential manner, and the RGB backlight is emitted at the same time as each RGB signal is omitted.

In this way, it is possible to reproduce a color image by lighting up each pixel in RGB colors within one field. Each RGB by memory
It becomes possible to read out the signals separately at different times.

That is, one field can be time-divided and written to the panel for each RGB primary color signal. By doing this, each dot has an RGB color fc within one field.
Turn on the light W times and use the additive coloring method based on the afterimage characteristics of the eye.
Full-color display is possible with dots.

The difference from the conventional color reproduction method is that the RG on the panel
In contrast to the method of displaying color by forming one picture element 8 with B5 dots, in the present invention, each dot on the panel is
The point is that GB are lit in time division to form one picture element and reproduce a color image.

Furthermore, the difference between the conventional 5-panel projection system and the conventional 5-panel projection system is that while 5 panels are used to achieve full-color display for each dot, the present invention uses 1 panel. The advantage is that it is possible to reproduce high-definition images equivalent to the five-disk projection system.

Moreover, in the conventional s-plate system, five images were superimposed and it was necessary to project them onto a screen, but in the present invention, direct viewing is possible because a single panel is used.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a signal processing circuit of a single-panel liquid crystal color display device according to the present invention, in which video input terminals 1. Chroma circuit 2. Synchronization 1” path 3. Control circuit 4, digital delay circuit 5. Polar numbering circuit 6. It consists of a liquid crystal panel 7.5 color light source 8, and the digital delay circuit 5 is replaced by A/D circuits (analog/digital conversion circuits) 51a and 51b.
, 51e, memory circuits 52a, 52b, 5
2c, a digital switching circuit 55, and a D/A circuit (digital/analog conversion circuit) 54, and the three-color light source 8 is replaced by an R light source 81.2c. It is composed of a G light source 82 degrees and a B light source 83.

The signal processing circuit (herein, the video signal (or video signal) at terminal 1 is input to the chroma circuit 2 and the synchronization circuit 5).

A synchronization circuit 5 forms a synchronization signal synchronized with the vertical and horizontal synchronization signals of the video signal, and a control circuit 4 forms a control signal for controlling the entire circuit based on this synchronization signal.

The chroma circuit 2 demodulates the RGB primary color signals based on the input video signal, and the memory circuits 52a and 52b of the digital delay circuit 5 are used for each RGB primary color signal.

52c.

In the digital delay circuit 5, a memory circuit 52a.

The RGB primary color signals stored in 52b and 52c are sequentially read out for each color and output to the polarity numbering circuit 6 at the subsequent stage.

The polarity changing circuit 6 periodically switches the polarity of the primary color signals sent and supplies them to the liquid crystal panel 7.

On the liquid crystal panel 7, an R monochrome image is written in accordance with the input order of the R primary color signal, then a G monochrome image is written in accordance with the input of the G primary color signal, and finally a B monochrome image is input. Write an image.

On the other hand, in the three-color light source 8, the color of the light source is switched in synchronization with the writing of the RGB monochrome image on the liquid crystal panel 7. In other words, when the R primary color signal writing on the liquid crystal panel 7 is completed, the R light source 8
, the G light source 82 is turned on at the end of writing the G primary color signal, and the B light source 83 is turned on at the end of writing the B primary color signal.

An example of such a light source that flashes at high speed is a strobe light source that emits flash light. By using three such strobe light sources and arranging an RGB color filter for each strobe, it is possible to realize a three-color light source that can emit light by switching the colors to RGB.

In this way, a monochromatic RGB image is displayed on the liquid crystal panel 7 in a frame-sequential manner, but by switching the color of the light source 8 in accordance with the writing of the RGB primary color signals, it is displayed as a single color image by the afterimage of the human eye. Recognized.

FIG. 2 is a timing chart for explaining the time relationship of each signal in the block diagram shown in FIG. 1 above.

The RGB primary color signals obtained by demodulating the video signal of the first field period by the chroma circuit 2 are R1, G1 . B1
Then, the RGB primary color signals obtained by demodulating the video signal of the second field are respectively R2-G2*B2 (.

These primary color signals R1, G1 . B1. R2°G2. B2
are delayed by the digital delay circuit 5, and write signals R1, G1 . B1°R2, . . . are applied to the liquid crystal panel 7 via the polarity change circuit 68. Although FIG. 2 also shows the primary color signal RO*QO-BO based on the video signal before the first field, the following explanation will be based on the video signal after the first field.

In Fig. 2, the demodulation of the primary color signal is performed by 3 of Ri, G1°B1.
are performed simultaneously within the first field period, but writing is performed in R1, G1 . This is performed three times within the second field period in the order of B1.

It is assumed that each primary color signal is written in time tw, and a time interval is roughly set between writing times, and this is designated as tl (0 These times include the period of the video signal, the response of the liquid crystal, etc.) There is a time-based limit, total time of 3 writes 5 (tw
+tj) is made shorter than one field period (~16.5ms) and time tl is made longer than the response time of the liquid crystal.

Regarding the response time of liquid crystals, 2 of “Liquid Crystal Applications” (Baifukan)
The specific value of "1 to 20 mB" (TN type LCD) is listed on page 5. For example, in the case of a panel with a response time of about 2 m1i, the setting value of the above time is tw = 5 m s,
It is possible to choose t l = 2.5 ms.

Alternatively, since a high-speed ferroelectric liquid crystal has a response time of about μS, for example, in the case of a panel with a response time of 100 μs, the above time setting value'z t vir =5 m s
It is also possible to select *tJ=0.5ms.

In this way, the R light source is turned on during the time tl after the R1 write is completed, the G light source is turned on during the time tl after the G1 write is completed, and the B light source is turned on during the time tl after the B1 write is completed. By turning on the light, each monochromatic image can be displayed in sequence.

Since the eye has an afterimage characteristic and cannot temporally distinguish between images written in one field, it will recognize three monochrome images displayed within one field as 81 color images.

FIG. 3 shows an example of a panel drive circuit that constitutes the liquid crystal panel 7 for writing to the liquid crystal using the timing chart shown in FIG.

The circuit configuration shown in FIG. 3 includes a liquid crystal display section 70. Vertical drive circuit 74. Horizontal drive circuit 76-1.76-2,...
76-, an input terminal 72a for the vertical scanning start pulse Vat, an input terminal 72b for the vertical scanning clock Vek, an input terminal 71a for the horizontal scanning start pulse Hst, an input terminal 71b for the horizontal scanning clock Hck, and an input terminal 75- for the video signal. 1, 75-2, ... 75-k.

That is, the vertical direction of the liquid crystal display section 70 is controlled by the vertical drive circuit 7.
In contrast, the horizontal drive circuits 76-1 and 7 are sequentially driven in the horizontal direction, and each divided part has two horizontal drive circuits 76-1 and 7.
6-2, . . . 76-k are provided and driven in parallel.

That is, the horizontal drive circuits 76-1, 76-2,...
・76- kfc j:! , the start pulse Hst and the scanning clock Hck are added in common, and the scan compensation signal Vid
eo −1.

Video -2, . . . Video -k are applied separately.

Of course, as is commonly done in the past, 76-1°76-2
．． It is also possible to drive the drive circuit in series with 76-.0 The operation of the drive circuit shown in FIG. 3 will be explained with reference to the timing chart shown in FIG.

Signals of positive polarity and negative polarity are applied to the liquid crystal display section 70 in order to prevent deterioration of the liquid crystal material due to the number of DC voltages applied.

That is, within the writing time tw of the R write signal, the positive and negative polarity signals of the same image content are written 82 times to complete the image writing. By applying two voltages within the specified time, the writing to the liquid crystal display section 70 can be made with positive polarity.
This is repeated twice, once each time the negative polarity signal t is applied.

The speed of the vertical scanning clock Vck here is generally done in American LCD TVs, so it is done once every field period (i.e., alternating current by writing positive and negative polarity signals is done over two fields. ) is more than 6 times faster than the writing speed.

This is because the write time tw (about 5 ma) of the R write signal is less than one-third of one field period.

Since writing is performed twice on the liquid crystal display section 70 during this time, writing on the liquid crystal display section 70 can be performed in less than one-sixth of the conventional time.

Note that it is also possible to use a method in which writing of positive polarity and negative polarity is performed in two fields, as in conventional writing. In other words, with the present invention, KGB in 2 fields
The screen sequential image writing is performed once at a time. This 0″?
In this case, the writing time to the liquid crystal display section 70 is about one-third of the conventional time.

However, the above is not a strict driving method, so in the embodiment of the present invention, one field has one drive based on the principle of a television.
This will be explained using a writing method that ends writing on the screen.

Regarding horizontal scanning, the horizontal start pulse Hs is set so that the horizontal scanning is completed within the scanning period of one line.
t *Horizontal scanning clock Hck is applied 0 As a horizontal scanning method, there is simply a conventional method in which pixels in the horizontal direction are sequentially driven within a scanning period of one line. However, like the vertical scan, the horizontal scanning clock is more than six times that of the conventional one, and the burden on the horizontal drive circuit is heavy.

For example, on a panel with 640 pixels horizontally x 480 pixels vertically,
When writing an image using the SC method, the conventional vertical scanning clock frequency is 15.754 kHz and the horizontal scanning clock frequency is 10.7 M Ilz. On the contrary,
If the panel writing shown in FIG. 2 is realized by sequential driving, the vertical scanning clock frequency will be approximately 96 k)lz, and the horizontal scanning clock frequency will be approximately 64.2 Mfiz. From this value, for vertical scanning, the clock is about 100 & there is no particular problem at present, but for horizontal scanning, the clock is about 60M
tlz, which means that the load on the horizontal scanning circuit increases.

Therefore, as an example of reducing the horizontal scanning clock frequency, it is possible to perform parallel scanning by dividing the horizontal scanning into 0. There are various methods for parallel scanning, but basically the ,
These methods can be broadly divided into methods that add processing to the video signal and methods that add processing to the timing of the start pulse and clock.

That is, (1) Common start pulse for K horizontal drive circuits.

It is operated by a scanning clock, and (a) divided video signals are input to the video input terminal of each circuit.

Alternatively, a video signal delayed in stages is input to the video input terminal of each circuit.

(5) The K horizontal drive circuits are operated with a common scanning clock, and the same video signal is applied to the video input terminal of each circuit, but the start pulse is applied at different timings.

It's a method.

The drive circuit shown in FIG. 6 and the timing chart shown in FIG. 4, which describe the present invention, show an example of the above (1) (a).

That is, in FIG. 4, the video signal for one line written within the scanning period of the l-th line is divided into equal numbers along the time axis. Video the first signal obtained by dividing these
o −1, second signal as Video−2°...Vi
deo-k, and the respective signals are applied in parallel to the horizontal drive circuits 76-1, 76-2, . . . , 76-k to drive them.

By this parallel drive, each horizontal drive circuit 76-1°76
-2. . . 76-, the video signal divided into 1/2 is written within the scanning period, so the horizontal scanning clock can be reduced to 1/2.

Therefore, in the single-panel color display according to the present invention, the writing speed for each single-color screen is more than six times that of the conventional one, and by employing parallel driving, it is possible to write sufficiently in the horizontal direction as well.

The embodiment of the present invention described above using FIGS. 1 to 4 is one example, and embodiments with different configurations are also possible.

Examples of these will be described below.

First, in Figure 41, in order to perform frame-sequential scanning, select Memo+752.
Although the primary color signal digital outputs of a to 52c are switched by the digital switching circuit 53, nine other configurations are also possible.

For example, in FIG. 5, the digital outputs of the memos 1J52a to 52c are input to the D/A 54. The configuration is such that the analog signal is converted into an analog signal in ~54c and then switched in the analog switching circuit 9. The only difference is that the number of D/As 34a to 54c is increased, and the other configurations and operations are different.

Regarding effects and the like, this embodiment is the same as the embodiment described in FIGS. 1 to 4.

Next, in FIG. 1, since the write signal to the liquid crystal panel 7 is a primary color signal, the chroma circuit 2 forms RGB primary color signals.
However, other configurations are possible.

For example, in FIG. 6, the input video signal is R
The configuration is such that it demodulates into color difference signals of -Y and B-Y, and processes these color difference signals and the luminance signal Y, which are five signals. Each three signals are D/A 54. The difference from FIG. 5 is that the signal is converted back to an analog signal in ~54c and then converted into an RGB primary color signal for processing in the matrix synthesis circuit 10, but the other configurations, operations, effects, etc. are the same as in FIG. .

Further, in FIG. 1, the input video signal is demodulated by the chroma circuit 2 and then processed by the digital circuit 5, but other configurations are also possible.

For example, in FIG. 7, the input video signal is digitally processed by the digital circuit 5, and then the video signal is demodulated by the chroma circuit 2 to form RGB primary color signals. It has the advantage of requiring fewer A/D circuits, memory circuits, etc. than the methods shown in Figures 1 and 2 that memorize RGB, but because the video signal is retrieved and demodulated three times within one field, it requires a chroma circuit. It is necessary to speed up the entire circuit, such as operating it at more than five times the speed of conventional technology.

Specifically, the chroma circuit is operated by setting the frequency of a color subcarrier signal (subcarrier) for demodulating the carrier color signal to three times or more.

As described above, the embodiment shown in FIG. 7 differs from the embodiments shown in FIGS. 1 to 6 in that writing and reading to and from the memory are performed at the video signal stage and that the chroma circuit operates faster than the conventional one. 8 and 9 show examples of the configuration of a liquid crystal light source in which the video signal is demodulated and the polarity of the primary color signal formed is alternated.

The T light source 88 shown in FIG. 8 is configured to illuminate the liquid crystal display section 70 from behind, and includes light valves 81a and 82a.

85a1 reflective surfaces 81b, 82b, 84b and color filters 81c, 82c, 85c, five RGB light sources 81, 82.85, which are distinguished by their respective color filter colors, and these five RG
B light source 81, 82゜838 lighting circuit 101,
102, In2, and lighting circuits 101, 102,
A switching control circuit 100 that controls 105 and an RGB light source 8
1, 82, and a diffusion plate 84 that diffuses the light rays from 83.

In the light source 88, the switching control circuit 100 turns on the lighting circuits 101, 102, and 103 in synchronization with the image writing to the liquid crystal display section 70.
, and control the RGB light sources 81 , 82 . The color of the light source is switched by sequentially lighting up the BS.

Figure 8 shows a simple configuration in which the light rays from the RGB light sources 81, 82, 83 are directly diffused by the diffusion plate 104, but the characteristics of the light source are determined by the nine points at which various optical components such as prisms, mirrors, and lenses are arranged.・Functionality can be greatly improved.

For example, a light source 89 shown in FIG. 9 is provided with a dichroic prism 90, and has a configuration in which the light rays from each of the RGB light sources 81, 82, 85 are emitted in one direction by the dichroic prism 90 and then diffused.

In the configuration shown in FIG. 9, the dichroic prism 9
Since it uses 0, the structure is somewhat complicated and the price is high (although it has the effect of reducing brightness unevenness and white balance deviation on the diffusion surface).

In addition, in FIGS. 8 and 9, the color filter 81C982
c and 83c distinguish the colors of the RGB light sources 81 and 82.83, but the light valves 81a, 82a,
For example, if an ROB fluorescent tube coated with short afterglow RGB phosphors is used as 85a, no color filter is required.

Furthermore, as shown in FIG. 10, it is also possible to use one monochromatic light source 85 as the three-color light source 87 and to perform color switching by a filter color switching device 86 disposed in front of the monochromatic light source 85.

As the filter color switching device [86, for example, (1) RG
There is a device that changes the color by mechanically switching the filter B using a motor or the like (2) A device that changes the color by controlling the grating of a diffraction grating using a surface acoustic wave element or the like.

A white laser can vary the spectrum of the output light beam with a single light source, and when such a light source is used, the filter color switching device 86 described above becomes unnecessary.

Note that if a laser or the like is used, it is possible to color-code the irradiation of light on the panel, so the liquid crystal panel can be illuminated even during the writing of a monochrome image.

For example, FIG. 11 shows an RGB laser light source 501°30
2, 305 is a three-dimensional diagram showing an example of a configuration in which the writing portion on the panel is irradiated in different colors.

The LCD display section 7 is a type of memory, and the previous R4 until a new GV is added to the panel! : Included information is displayed and remains.

Therefore, the control circuit 500 controls the RGB laser light source 501°3.
Controls the light emission of 02, 503 and 1. onto the panel. The panel is displayed in color by irradiating or scanning the dotted lines. However, the RGB laser light source 501 in the drawing
, 502 and 303 also include a function to modulate the optical path of the laser beam.

As a result, the light source can be operated to illuminate the panel even during screen rewriting, which has the effect of increasing the usage efficiency of the light source and making the panel brighter.

Although the embodiments related to direct-view display devices have been described above in FIGS. 1 to 9, the embodiments can also be easily applied to projection display devices.

For example, as shown in the block diagram shown in FIG. 12, the projection lens 201. By adding the projection screen 202, a projection type single-panel liquid crystal display device can be easily configured.

The characteristic parts of the projection type are the three-color light source 8° liquid crystal panel 7, the projection lens 201, and the projection screen 202 shown in FIG.
This is a projection display section 200 consisting of. Moreover, parts of the projection display unit 200 that are unique to a projection type display device are a projection lens 201 and a projection screen 202.

That is, except for the projection lens and the projection screen, the projection type display device has the same structure as the direct view type explained in FIGS. 1 to 10, and the effects are also the same as explained above. .

Further, the projection display section 200 is shown in FIG. 15 using an imaging device: t3
00, it is possible to easily configure a high-definition video image capturing device [t.

A photographing device 500 in FIG. 13 is an example of a configuration in which an image displayed on a liquid crystal panel 7 is projected onto a camera 502 such as an instant film and photographed.

In the above-mentioned embodiment, a monochromatic RGB screen is displayed in sequence, and a color still image is photographed by triple exposure on one film.

In order to link the screen display and the camera, an external control terminal 305 is provided to control the timing of opening and closing the shutter of the camera 502, the timing of sequential RGB screen writing to the liquid crystal panel 7, and
The lighting timing of the color light source 8 is forcibly controlled.

”, as explained above.

〔Effect of the invention〕

According to the present invention, each RGB primary color signal obtained by demodulating a video signal is written on a monochrome liquid crystal panel, and the RGBs color light source is turned on in synchronization with the writing time of these primary color signals, thereby producing a single monochrome LCD panel. Since the liquid crystal panel can perform puercasting display on a dot-by-dot basis, it has the effect of being able to reproduce color images with higher definition than the conventional display method of displaying RGB dots.

Furthermore, since the present invention uses a single-panel projection system, optical adjustment is easier compared to a six-panel projection system that requires optical superimposition of RGB images, and the color image displayed on the panel is projected onto the screen. This has the effect of allowing you to see it directly.

Furthermore, since only one liquid crystal panel is used, the conventional three
Compared to the plate projection method, this method has the effect of reducing the cost occupied by the liquid crystal display section.

[Brief explanation of drawings]

7. Fig. 1 is a block diagram of a signal processing circuit of a single-panel liquid crystal color display device of the present invention, Fig. 2 is a timing chart diagram for explaining the signal processing of Fig. 1, and Fig. 3 is a diagram of a liquid crystal that can be placed in Fig. 1. Figure 4 is a block diagram showing an example of the configuration of the panel. Figure 4 is a timing chart diagram for explaining the operation of Figure 3. Figure 5 is a signal processing circuit block diagram for explaining the second embodiment of the present invention. 6 is a block diagram of a signal processing circuit for explaining a third embodiment of the present invention, FIG. 7 is a block diagram of a signal processing circuit for explaining a third embodiment of the present invention, FIG.
Figures 9 and 10 are configuration diagrams showing an example of the configuration of a light source that performs color switching, and Figure 11 is a three-dimensional diagram illustrating an example of the configuration of a light source that can color-code and illuminate the panel even during screen rewriting. , FIG. 12 is a block diagram showing a configuration example of a projection type single-panel liquid crystal color display device of the present invention, and FIG.
The figure is a block diagram showing an example of the configuration of a video image capturing device using the single-panel liquid crystal color display device of the present invention. Explanation of symbols 1... Input terminal 2... Chroma circuit 3...
Synchronous circuit 4... Control circuit 5... Digital delay circuit 6... Polarity numbering circuit 7... Liquid crystal panel 8...
Three-color light source 51...A/D circuit (analog/digital conversion circuit) 52...memory 54...D/A circuit (digital/analog conversion circuit) 81, 82.85...R, G, B light source 201...
Projection lens 202...Projection screen 302...
・Photograph machine? 〒Figure 〒2Figure i'5Figure 1deol 1deoZ 1deok Force 4Figureiv L w Ck vrdeoh 2nd/) ”h Lftl 4345
figure? 111 46 figure 2' Congee 1 figure Spear 6 figure blank circle de 10 figure Child figure 412 figure 〒19 figure

Claims (1)

[Scope of Claims] 1. A liquid crystal panel, a demodulation circuit that demodulates an input video signal into a primary color signal, a switching circuit that switches the polarity of the primary color signal at a constant cycle, and a primary color signal whose polarity has been switched to the liquid crystal panel. A liquid crystal color display device comprising a writing means for writing on the liquid crystal panel and a light source for illuminating the liquid crystal panel, the liquid crystal panel having a monochrome display panel;
a storage circuit that stores primary color signals; a readout circuit that reads out the stored primary color signals; a write circuit that writes the read primary color signals for each color in a field-sequential manner; A single-panel liquid crystal color display device characterized by being equipped with a lighting circuit that lights up by switching the color of a light source. 2. A liquid crystal panel, a demodulation circuit that demodulates an input video signal into a primary color signal, a switching circuit that switches the polarity of the primary color signal at a constant cycle, and a writing means that writes the primary color signal whose polarity has been switched to the liquid crystal panel; In a liquid crystal color display device comprising a light source that illuminates a liquid crystal panel, the liquid crystal panel has a monochrome display panel, and
A storage circuit that stores the color difference signal and luminance signal at the stage before forming the primary color signal, a readout circuit that reads out the stored color difference signal and luminance signal, and synthesizes the primary color signal based on the read color difference signal and brightness signal. a matrix circuit that writes the primary color signals for each color in a field-sequential manner,
1. A single-panel liquid crystal color display device comprising: a lighting circuit that switches the color of the light source and lights it up in synchronization with a color signal written in frame sequential manner. 3. a liquid crystal panel, a demodulation circuit that demodulates an input video signal into a color signal, a switching circuit that switches the polarity of the color signal at a constant cycle, a writing means that writes the color signal whose polarity has been switched to the liquid crystal panel; In a liquid crystal color display device comprising a light source that illuminates a liquid crystal panel, a monochrome display panel is provided as the liquid crystal panel, and
a storage circuit that stores an input video signal; a readout circuit that reads out the stored video signal multiple times at multiple speed; a demodulation circuit that demodulates the read video signal into a color signal at multiple speed; A writing circuit that writes in plane sequentially for each
A single-panel liquid crystal color display device comprising a lighting circuit that switches the color of the light source and lights it up in synchronization with the color signal written in the frame sequential manner. 4. The liquid crystal panel driving circuit according to claim 1, claim 2, or claim 3, wherein a circuit for dividing and driving the liquid crystal panel is provided, and the driving circuit performs parallel writing. Single-panel liquid crystal color display device. 5. The single-panel liquid crystal color display device, characterized in that it emits a light beam of a color that matches the monochromatic image to be displayed during a period from the end time of frame sequential writing to the liquid crystal panel to the start time of the next frame sequential writing. light source. 6. A projection type liquid crystal display device according to claim 1, 2, 3, or 4, further comprising an optical system for projecting a display screen onto a screen. 7.Display RGB monochrome screen in frame sequential manner on monochrome panel,
A video screen photographing device characterized in that a color still image is photographed by performing triple exposure on a single film.