JPH10161597A - Liquid crystal display device and liquid crystal projector using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device and a liquid crystal projector which use a single liquid crystal panel, produce no flickering in the screen, display color images of natural motions or project color images. SOLUTION: Color data of analog RGB signals is alternately written into RAM 16r-16b or 16r'-16b'. On the other hand, color data is read out from the RAM 16r'-16b' or 16r-16b which are not being subject to write processing with the period e.g. three times the length of the write period and, after its gain, etc., are adjusted by a LCD driver 12 to output R(red), G(green) and B(blue) signals of a shortperiod on a liquid crystal panel 5 by changing switches 13r-13b. And it is then possible to irradiate the liquid crystal panel 5 with the corresponding colors in synchronization with the outputs of R, G, B color signals through a rotating filter 4. By this constitution, images are projected with a very short period onto a screen, etc., and image projection of natural motions is carried out without flickering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device using a single liquid crystal panel and a liquid crystal projector using the device.

[0002]

2. Description of the Related Art In a liquid crystal projector, a liquid crystal panel is used to form a projection image on a screen. Such a liquid crystal panel is widely used for a display screen of a notebook computer, a liquid crystal television, and the like.

Conventionally, when a color image is displayed using the above-described liquid crystal panel, for example, Japanese Patent Application Laid-Open No. 7-28164
There is known a color panel display device disclosed in Japanese Patent Application Publication No. 7-107. This device uses a single liquid crystal display panel and three color backlights of R (red), G (green), and B (blue) to create a color image.
The corresponding backlight is illuminated at the timing when the (green) and B (blue) image data are output. By repeating this process at a predetermined period (for example, 50 to 70 Hz), a color image is displayed using the afterimage of the human eye.

That is, if the period at which the analog signals of R (red), G (green), and B (blue) are sent is, for example, 50 Hz, the timing of R (red), G (green) is 50 Hz.
An operation of capturing signals of three colors (green) and B (blue) as one screen (one frame) is performed. In other words, the time for one frame is 1/50 = 0.02 seconds. Next R
(Red), G (green), and B (blue) are sequentially output at the same cycle (50 Hz). That is, R (red) data is displayed for 0.02 seconds, and then G (green) data is displayed for 0.0 seconds.
The operation of displaying for 2 seconds and then displaying B (blue) data for 0.02 seconds is repeated. In this way, displaying an image of one input frame required three times as much as three frames.

[0005]

In the conventional apparatus, when the color display is performed as described above, the display of R (red), G (green), and B (blue) is repeated at a cycle of 50 to 70 Hz. ing. Therefore, R (red), G (green), B (blue)
The display cycle of each color is, for example, 1 based on 50 Hz.
The color display is switched at about 7 Hz. However, in such a cycle, flickers remain in human eyes, and the screen becomes very difficult to see.

Further, as in the example of the above publication, R
There is no memory for each color data of (red), G (green), and B (blue), and when image processing is performed using one RAM, especially for moving image, R (red) and G (green) , B (blue) are signals shifted with the progress of time, and an image obtained by synthesizing them becomes an image having an unnatural motion.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a liquid crystal display device capable of displaying or projecting a color image with natural motion without flickering on the screen, and a liquid crystal projector using the device. It is.

[0008]

According to a first aspect of the present invention, there is provided a storage unit for storing an analog color signal for each color data, and storing the color data stored in the storage unit in the storage unit. Data reading means for reading out at a cycle earlier than the writing cycle of the data reading means, selecting means for selecting the color data read by the data reading means at a predetermined cycle, a liquid crystal panel to which the color data sequentially selected by the selecting means is inputted; This can be attained by providing a liquid crystal display device having a liquid crystal panel and light irradiating means for irradiating light of the same color as the selected color data at the same cycle as the selecting cycle of the selecting means.

That is, color data is stored in the storage means for each color data of the analog color signal, and when this color data is read out, it is read out as compressed color data at a cycle earlier than when it is stored. Select one by one and deploy to the LCD panel. Then, by emitting light of the same color as the color data developed on the liquid crystal panel to the liquid crystal panel for the same period as the period of developing on the liquid crystal panel, color display is performed on the liquid crystal panel.

With this configuration, it is possible to produce a liquid crystal panel at high speed with light emission based on each color data, and to provide a color image without flicker. The invention according to claim 2 embodies the invention according to claim 1, wherein the analog color signal includes, for example, R (red), G
(Green) and B (blue) color signals.

That is, R (red), G (green), and B (blue) color data are created from the analog RGB signals via a decoder, and the color data is stored in storage means. As described above, by reading out at a cycle three times faster than the writing cycle and outputting to the liquid crystal panel, the R (red), G (green), and B (blue) color display can be performed on the liquid crystal panel at high speed. Color images can be realized.

The invention according to claim 4 embodies the invention according to claim 1, and the storage means includes:
For example, it has two storage areas and alternately writes and reads data.

With this configuration, while color data is being written to one memory, compressed color data can be read from the other memory at the same time, and data can be read and written efficiently and at high speed. .

The invention according to claim 5 embodies the invention according to claim 1, wherein the light-emitting means includes:
For example, the configuration is such that light from a single light source is color-converted by a rotation filter.

For example, this rotary filter has R (red), G
The filters of (green) and B (blue) are arranged at intervals of 120 °, and are rotated, for example, in synchronization with a vertical synchronization signal. During one rotation of the rotating filter, for example, R (red), G (green), B
The liquid crystal panel is irradiated with (blue) light.

The light emission of R (red), G (green), and B (blue) is not limited to the case where the light is emitted through a rotary filter, and a lamp may be used for each color. At this time, the rotation filter is provided with a sensor for detecting the rotation position of the rotation filter, the color signal output to the liquid crystal panel is made to correspond to the position of the rotation filter, and the color signal output to the liquid crystal panel is provided. The color of the light to be irradiated is made to match, and a color image accurately synchronized with the liquid crystal panel is created.

According to a seventh aspect of the present invention, there is provided a storage unit for storing an analog color signal for each color data, and a cycle of writing the color data stored in the storage unit earlier than the writing cycle to the storage unit. Data reading means for reading at a predetermined cycle, selecting means for selecting the compressed color data read by the data reading means at a predetermined cycle, a liquid crystal panel for outputting the compressed color data sequentially selected by the selecting means, and the liquid crystal panel With the same cycle as the selection cycle of the selection means,
A light irradiation unit that emits light of the same color as the selected color data, and light from the light irradiation unit is transmitted through the liquid crystal panel,
This can be achieved by providing a liquid crystal projector having projection means for projecting the transmitted light onto a subject.

The present invention uses the structure of the liquid crystal display device and applies the liquid crystal panel to a liquid crystal projector. Therefore, the configurations of the storage unit, the data readout unit, the liquid crystal panel, and the light irradiating unit are the same as those of the above-described liquid crystal display device. However, the present invention has a projection unit that irradiates a color image transmitted through the liquid crystal panel to a subject such as a screen. . For example, a projection lens that forms an image on a screen corresponds to the projection unit.

Therefore, by configuring the liquid crystal projector in this way, it is possible to provide a projected image without flicker. Further, according to the present invention, as described above, the analog color signals are, for example, R (red), G (green), B (blue).
By reading the color data stored in the storage means at, for example, three times the writing cycle as described in claim 9, the liquid crystal panel can display R (red), G (color) signals at high speed.
The compressed color data of (green) and B (blue) can be expanded, and a color image without flicker can be projected.

The invention according to claim 10 also embodies the invention according to claim 7, wherein the storage means has, for example, two storage areas, and alternately writes and reads data. And reading and writing of color data can be performed efficiently and at high speed.

The invention according to claim 11 also embodies the invention according to claim 7, wherein the light irradiating means performs, for example, color conversion of light from a single light source by a rotary filter. For example, R (red), G (green), B (blue)
Is emitted to the liquid crystal panel.

In this case, a sensor for detecting the rotational position of the rotary filter is provided, and a color signal to be output to the liquid crystal panel is made to correspond to the position of the rotary filter, and a color to be output to the liquid crystal panel is provided. The color of the signal and the light to be irradiated are matched, and a precisely synchronized color image can be projected on the screen from the liquid crystal panel.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a system configuration diagram of the liquid crystal projector of the present embodiment. The liquid crystal projector 1 of this embodiment includes a halogen lamp 2, an infrared ray removing filter 3, a rotation filter 4, a liquid crystal panel 5, a liquid crystal panel driving unit 6, and a projection lens 7. Halogen lamp 2
Is a lamp that emits white light, and the emission of the halogen lamp 2 is applied to the infrared ray removing filter 3. The infrared light removing filter 3 removes infrared light contained in the white light, and the white light from which the infrared light has been removed is applied to the rotating filter 4.

The rotary filter 4 is attached to a rotary shaft 8 'of the motor 8, and rotates according to the rotational speed of the motor 8, which will be described later. In addition, R (red), G
(Green) and B (blue) color filters 4r, 4g, and 4b
It is arranged with a rotation angle of 0 ° and rotates in the direction indicated by the arrow in FIG. The white light described above passes through any one of the color filters of the rotating filter 4 rotating at a predetermined speed, and converts the white light into any one of R (red), G (green), and B (blue),
Irradiate the liquid crystal panel 5.

The liquid crystal panel 5 is composed of one liquid crystal display panel and has, for example, 640 × 480 pixels, and the light transmittance of these pixels changes according to input color data. The liquid crystal panel 5 is driven in accordance with R (red), G (green), and B (blue) color data output from the liquid crystal panel driving unit 6 and is output to the liquid crystal panel 5 at a timing described later. For example, when the liquid crystal panel 5 is irradiated with red light, R (red) color data is supplied, and when green light is irradiated, G (green) color data is supplied, and blue light is supplied. When illuminated, B (blue) color data is provided. In this manner, R (red), G (green), and B (blue) color images are sequentially formed on the liquid crystal panel 5, and the color images are projected onto a screen (not shown) via the projection lens 7.

FIG. 1 is a circuit block diagram of the liquid crystal panel driving section 6 described above. Although FIG. 1 also shows the basic configuration of the liquid crystal projector 1 of the present embodiment, the infrared filter 3 is omitted. FIG. 1 also shows a motor synchronization circuit 9 for driving the motor 8 at a synchronous speed, and also shows a sensor unit 10 for detecting the rotational position of the rotary filter 4.

The liquid crystal panel driving section 6 includes the data storage circuit 1
1, an LCD driver (hereinafter, referred to as an LCD driver) 12, an adjustment circuit 12 ', and an analog switch 13. FIG. 3 shows only the basic configuration of the liquid crystal panel driving section 6 described above.

The data compression circuit 11 has R (red), G
(Green) and B (blue) analog RGB signals
Analog / digital conversion circuits (hereinafter, referred to as A / D conversion circuits) 15r to 15b, and six RAMs 16r to 16b (having six storage areas), 16r 'to 16r
b ′, three digital / analog conversion circuits (hereinafter, D /
A conversion circuit) 17r to 17b and a memory control circuit 18.

An analog RGB signal having image information such as a television signal is converted to an RGB signal through an RGB decoder (not shown).
The data is converted into (red), G (green), and B (blue) color data and supplied to the corresponding A / D conversion circuits 15r to 15b. For example, the R (red) color data is output to the A / D conversion circuit 15r, converted into a digital signal, and then expanded on the RAM 16r. The R (red) color data to be input next is
The data is expanded on another RAM 16r '. Like this one
The reason for having two RAMs for one color is that while writing data to one RAM (for example, the RAM 16r), data is read from another RAM (for example, the RAM 16r '). On the other hand, the data read from the RAM 16r or 16r 'is again converted into an analog signal by the D / A conversion circuit 17r and output to the LCD driver 12.

Note that analog RGB signals other than the R signal, that is, the G signal and the B signal similarly have the corresponding A / D signals.
After being output to the conversion circuit 15g or 15b and converted into a digital signal, the RAM 16g (16g ') or 16b (1
6b ') and the RAM 16g' (16g) or 1
The data read from 6b '(16b) is again converted into an analog signal by the corresponding D / A conversion circuit 17g or 17b and output to the LCD driver 12.

The RAMs 16r-16b, 16r'-
When the color data is read from 16b ', it is read by a clock signal having a cycle three times the writing cycle, as described later.
Note that data is written to the RAMs 16r to 16b and 16r 'to 16b', and the RAMs 16r to 16b and 16r '
The reading of data from .about.16b 'is performed under the control of the memory control circuit 18. The memory control circuit 18 outputs, for example, a vertical synchronization signal (VSYNC) and a horizontal synchronization signal (HSYNC) output from a host device.
Create a write signal and a read signal based on
The data is output to the above-mentioned RAMs 16r to 16b.

The LCD driver 12 performs gain adjustment, brightness adjustment, gamma adjustment and the like on the input analog signal according to the adjustment signal output from the adjustment circuit 12 ′, and outputs the analog signal to the analog switch 13. Analog switch 13
Is, for example, a (non-contact) switch 13r such as a transistor.
13b, and switches are switched at a predetermined timing. The switching timing of the switches 13r to 13b is based on the output of the sensor 10.

The sensor 10 is an optical sensor, and the sensor 10 in FIG.
a, 4b, four marks 4rb, 4bg, 4g provided on a rotating filter 4 having two optical axes shown in FIG.
r, 4gr ′. Specifically, three marks 4rb, 4bg, and 4gr are formed at positions where the optical axis 10a is blocked, and the remaining marks 4gr 'are positioned at the optical axis 10b.
It is formed at a position where the light is blocked. That is, each time the rotary filter 4 makes one rotation, the mark 4gr 'blocks the optical axis 10b, and each time the rotary filter 4 rotates 120 °, the marks 4rb, 4bg, and 4gr block the optical axis 10a. Therefore, from the sensor 10 to the analog switch 13,
A mark detection signal (switch switching signal) is supplied each time the rotary filter 4 rotates 120 ° with reference to the position of the mark 4gr '. In the figure, the sensor 10 and the rotary filter are shown at positions separated from each other, but actually, two optical axes 10a and 10b are provided at positions corresponding to the four marks.

The analog switch 13 sequentially switches the switches 13r to 13b in accordance with the above-described signals, and outputs analog signals including image information to the liquid crystal panel 5 in the order of R (red), G (green), and B (blue).

On the other hand, the liquid crystal panel 5 has R (red), G (green) or B (blue) passed through the rotary filter 4 as described above.
Is irradiated. The irradiation timing of each color from the rotation filter 4 is based on a drive signal from a motor synchronization circuit 9 that determines the rotation speed of the motor 8.

FIG. 4 is a diagram for explaining a control system of the above-described motor synchronization circuit 9. The motor synchronization circuit 9 is a so-called PL
The synchronization speed is accurately maintained by the L control. That is, the rotation frequency (fo) of the motor 8 is detected by an output signal from the voltage control output 9d, and outputs a frequency-divided signal (fo / N) to the comparator 9b via the frequency divider 9a. The comparator 9b is supplied with a synchronization signal of the reference frequency (fR) supplied from the memory control circuit 18, and the comparator 9b detects a phase difference between the two signals, and converts an analog signal based on the phase difference into a low-pass filter. The voltage is supplied to a voltage control output 9d via 9c, and the motor 8 is accurately rotated at a synchronous speed according to the voltage control output. The reference frequency supplied from the memory control circuit 18 to the comparator 9b is a signal synchronized with the above-described vertical synchronization signal (VSYNC).

Next, the processing operation of the liquid crystal projector 1 having the above configuration will be described. The time chart of FIG. 5 illustrates the processing operation of this example. First, the power of the liquid crystal projector 1 is turned on, and an initial setting process of the liquid crystal projector 1 is performed. This initial setting processing includes, for example, the RAMs 16r to 16b and 16 in the liquid crystal panel driving unit 6.
r ′ to 16b ′, and outputs a reset signal to the RAM 16r
The data remaining in the analog switches 13 to 13b are cleared, and the switches 13r to 13b of the analog switch 13 are turned off. Further, the motor 8 is driven, and the motor 8 is driven at a rotation speed synchronized with the vertical synchronization signal (VSYNC) under the control of the motor synchronization circuit 9.

Next, the memory control circuit 18 outputs a write signal to the RAMs 16r to 16b in synchronization with the input vertical synchronizing signal (VSYNC), and the analog signals converted into digital data by the A / D conversion circuits 15r to 15b. Write color data based on RGB signals. At this time, RA
The color data written in the M16r to M16b is stored in the corresponding RAM 16r to 16 at the timing indicated by "" in FIG.
b. For example, R (red) color data is written into the RAM 16r (shown in FIG.
G (green) color data is written to 16g ('in the figure), and B (blue) color data is written to the RAM 16b ("" in the figure).
During one frame (between frames T1) after one vertical synchronizing signal (VSYNC) is output, horizontal synchronizing signals for the number of lines included in the frame are also output, and each line is executed in accordance with the output of this horizontal synchronizing signal. You. For example, in the first period T1, the clock for writing the color data is 1 / (20 ms / 640 /) when a screen display is performed at 50 Hz and a liquid crystal panel of 640 × 480 pixels is used.
480), which is a clock having a frequency of about 15 MHz.

In this way, the RAMs 16r to 16b store R
While writing (red), G (green), and B (blue) color data, the memory control circuit 18 controls the RAM 16r 'to
The color data already written is read from 16b '. However, since the color data is not written in the RAMs 16r 'to 16b' at the initial stage, the color data is not output even if the reading process is performed. During this time, the rotation filter 4
Since is rotating, the pulse signal is output from the sensor 10 to the analog switch 13.

Thereafter, when the next vertical synchronizing signal is supplied to the memory control circuit 18, the memory control circuit 18 stores the image data in the RAM for the next frame (T2).
The data is written to 16r 'to 16b'("" in the figure). On the other hand, the R (red), G (green), and B (blue) color data of the second frame is written to the RAM 16r 'to 16b'. While the memory control circuit 18 is in the RAM 16
The color data already written in r to 16b is read. That is, the memory control circuit 18
The color data of the first frame stored in 6r to 16b is clocked at a frequency three times the writing cycle described above (for example, when the writing frequency is 15 MHz, the frequency is 45M).
Hz clock). Further, since this read processing is performed for each of the RAMs 16r to 16b, for example, the data of R (red) (of FIG.
The data is read out to the CD driver 12. The same applies to the data of G (green) and B (blue) (“,” in the figure),
Each data is output to the LCD driver 12.

In the LCD driver 12, after performing gain adjustment and the like on the supplied color data, the analog switch 13
Output the color data to the analog switch 13 and the sensor 1
The aforementioned marks 4rb, 4bg, 4gr output from 0
Switch 13r at the output timing of the mark detection signal
To 13b are sequentially switched. For example, first, the switch 13r is turned on with reference to the input timing of the pulse signal () shown in FIG. 5 to supply the R (red) color data to the liquid crystal panel 5. Next, when the pulse signal is input, the switch 13r is turned off, and the switch 13g is
Is turned on, and G (green) color data is supplied to the liquid crystal panel 5. Further, when a pulse signal of
3g is turned off, and switch 13b is turned on instead,
The (blue) color data is supplied to the liquid crystal panel 5.

When the switches 13r to 13b are sequentially switched in accordance with the input of the pulse signal 〜, the liquid crystal panel 5 displays R (red), G
(Green) and B (blue) color data are sequentially supplied (to
"). Moreover, at this time, R supplied to the liquid crystal panel 5 is
The color data of (red), G (green) and B (blue) is 6.6 ms (1 frame (T1, T2, T3) is 20 ms).
20/3 ms).

Thereafter, every time the vertical synchronizing signal (VSYNC) is input, a new analog RGB signal is written with a clock signal of 15 MHz.
R (red) of frame T2 written in 16b ',
The color data of G (green) and B (blue) is tripled (45 MHz)
The data is read out by the clock of z), and color data is developed on the liquid crystal panel 5 according to the switching process of the analog switch 13. By repeating this process, the R (red), G (green), and B (blue) color data are sequentially developed on the liquid crystal panel 5, and the corresponding colors are passed through the rotation filter 4 to the liquid crystal panel 5.
Is projected onto the projection lens 7 to produce a flicker-free color image.
Can be projected on the screen via.

That is, R (red) color data is output to the liquid crystal panel 5, the corresponding pixel is set as a transmissive area, and red light is applied to the liquid crystal panel 5 via the rotation filter 4 to form a red image. A green image is created by outputting G (green) color data on the screen, outputting the corresponding pixels as transmission areas, and irradiating the liquid crystal panel 5 with green light via the rotating filter 4. The blue image is generated by outputting the (blue) color data, setting the corresponding pixel as a transmission area, and irradiating the liquid crystal panel 5 with blue light via the rotation filter 4.

Therefore, according to the liquid crystal projector 1 of this embodiment, the R (red), G (green), and B (blue) color data selected by the analog switch 13 and output to the liquid crystal panel 5 are 6.6 ms. Data with a very short cycle,
While this data is output (at the same cycle), the same color light emission is applied to the liquid crystal panel 5 via the rotary filter 4,
Since a color image is projected, for example, 20 m
With s, R (red), G (green), and B (blue) colors are not sequentially switched, but flickering of images can be reliably prevented.

According to the present embodiment, the RAM is provided for each color, and the projected image is originally created based on one analog RGB signal. R (red), G (green), B supplied
The (blue) color data is based on one analog RGB signal. Therefore, according to this example, a natural image can be projected even for a moving image.

FIG. 6 is a diagram for explaining a modification of the above-described liquid crystal projector 1. In the figure, A / D conversion circuits 15r to 15b, RAMs 16r to 16b, 16r 'to
16b ′, the configuration of the memory control circuit 18 is the same as that of the above-described embodiment, except that the D / A conversion circuit 17 is configured by one. That is, in the example of FIG.
In this configuration, data of 16r to 16b and 16r 'to 16b' are output to the LCD driver 12 via a data bus (not shown).

With this configuration, the configuration of the analog switch 13 is not required, and the configuration for simultaneously inputting data of each color in the LCD driver 12 is not required. Therefore, a liquid crystal projector can be realized with a simple configuration. However, in this case, the transfer timing of the color data to the liquid crystal panel 5 and the emission timing of each color from the light source are controlled by a CPU (not shown) or the like.

Although the liquid crystal projector has been described in the above embodiment, the present invention is not limited to the liquid crystal projector, but can be applied to a liquid crystal display device used in a personal computer, a liquid crystal television, or the like. Further, the light source is not limited to the above embodiment, and three light sources of R (red), G (green), and B (blue) may be used and turned on at timings “,” in FIG. .

[0050]

As described above, according to the present invention, an image without flicker can be displayed on the liquid crystal panel, or an image without flicker can be displayed or projected on the subject.

Further, even in the case of a moving image, an image of a natural motion can be displayed, or an image of a natural motion can be projected on a screen or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit block diagram of a liquid crystal panel driving unit used in the embodiment.

FIG. 2 is a system configuration diagram of the liquid crystal projector of the embodiment.

FIG. 3 is a diagram illustrating a basic configuration of a liquid crystal panel driving unit.

FIG. 4 is a diagram illustrating a control system of a motor synchronous circuit.

FIG. 5 is a timing chart illustrating a processing operation of the embodiment.

FIG. 6 is a diagram illustrating an example of a liquid crystal projector according to a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Halogen lamp 3 Infrared removal filter 4 Rotation filter 4r, 4g, 4b Color filter 4rb, 4bg, 4gr, 4gr 'Mark 5 Liquid crystal panel 6 Liquid crystal panel drive part 7 Projection lens 8 Motor 8' Rotation axis 9 Motor synchronization circuit DESCRIPTION OF SYMBOLS 10 Sensor part 11 Data storage circuit 12 LCD driver 12 12 'Adjustment circuit 13 Analog switch 15r-15b A / D conversion circuit 16r-16b, 16r'-16b' RAM 17, 17r-17b D / A conversion circuit

Claims (12)

[Claims] 1. A storage means for storing an analog color signal for each color data, a data reading means for reading the color data stored in the storage means at a cycle earlier than a data writing cycle to the storage means, and the data reading means Selecting means for selecting the compressed color data read out at a predetermined cycle, a liquid crystal panel to which the compressed color data sequentially selected by the selecting means is input, and a liquid crystal panel having the same cycle as the selecting cycle of the selecting means, And a light irradiating means for irradiating light of the same color as the selected compressed color data. 2. The analog color signal is R (red), G
2. The liquid crystal display device according to claim 1, wherein the signals are (green) and B (blue) color signals. 3. A liquid crystal display device according to claim 2, wherein a read cycle of said data read means is three times a data write cycle of said storage means. 4. The liquid crystal display device according to claim 1, wherein said storage means has two storage areas, and writes and reads data alternately. 5. The liquid crystal display device according to claim 1, wherein said light irradiating means performs color conversion of light from a single light source by a rotation filter. 6. The liquid crystal display device according to claim 5, wherein said selection means detects a rotation position of said rotation filter, and selects color data at said predetermined cycle based on the detection signal. 7. A storage means for storing an analog color signal for each color data, a data reading means for reading out the color data stored in the storage means at a cycle earlier than a writing cycle to the storage means, and a data reading means. Selecting means for selecting the read compressed color data at a predetermined cycle; a liquid crystal panel for outputting the compressed color data sequentially selected by the selecting means; and a liquid crystal panel having the same cycle as the selecting cycle of the selecting means. Light irradiating means for irradiating light of the same color as the selected color data; and projecting means for transmitting the light supplied from the light irradiating means through the liquid crystal panel and projecting the transmitted light onto a subject. Characteristic liquid crystal projector. 8. The analog color signals are R (red), G
The liquid crystal projector according to claim 7, wherein the color signals are (green) and B (blue) color signals. 9. The liquid crystal projector according to claim 8, wherein a data read cycle of said data read means is three times a signal write cycle to said storage means. 10. The liquid crystal projector according to claim 7, wherein said storage means has two storage areas, and writes and reads data alternately. 11. The liquid crystal projector according to claim 7, wherein said light irradiating means performs color conversion of light from a single light source by a rotation filter. 12. The apparatus according to claim 1, wherein said selection means detects a rotation position of said rotation filter, and selects color data at said predetermined cycle based on the detection signal.
2. The liquid crystal projector according to 1.