JPH0273224A - Matrix type image display device - Google Patents

Abstract

PURPOSE:To reduce convergence shift and a color unevenness by connecting scanning electrodes or signal electrodes of plural liquid crystal panels in common and driving them by a common driver circuit. CONSTITUTION:Output terminals of a Y driver circuit 3 are connected to scanning electrodes l1-l480 of liquid crystal panels 1R, 1G and 1B, and FETs of each panel are connected in common. These panels 1R, 1G and 1B are arranged linearly and the green liquid crystal panel 1G is arranged in the center and the red liquid crystal panel 1R and the blue liquid crystal panel 1B are arranged in the left and the right. As for a white light W from a lamp 10, a red light R, a green light G and a blue light B are supplied to the panels 1R, 1G and 1B, respectively by a blue reflecting dichroic mirror 14, a red reflecting dichroic mirror 15 and optical path changing mirrors 16, 17. Images on each liquid crystal panel are formed on a screen 19. According to this constitution, since the circuit 3 is used in common, a distance between adjacent liquid crystal panels can be made small, therefore, an image having high-definition is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image display device that uses a plurality of window display devices, and particularly relates to an image display device that uses a plurality of window display devices.
- It relates to a projection type liquid crystal image display device that projects an image onto an extra screen using an optical system.

[Conventional technology]

M) A liquid crystal 7o projector that enlarges and projects the image of a liquid crystal image display device (hereinafter referred to as a liquid crystal panel) consisting of pixels arranged in an IJ rack shape onto an optical system.
As described in Japanese Patent No. 128650, three liquid crystal panels are used to display images in red, green, and blue, and the images are projected onto the screen using a single-character system, thereby enlarging and displaying a full-color image. It is something. Active matrix type, simple matrix type, etc. are used for liquid crystal panels.
R.

IG, IB K A large number of signal electrodes LL and scanning electrodes 1r are arranged to drive one pixel, so VC! Driver circuit 2B
.

2G, 2B and Y driver circuit sIL, sa, sB
is necessary.

A driver circuit for a liquid crystal panel is arranged around a glass substrate that seals a layer of liquid crystal material.

Red, green, and blue primary color signals SR, EIG, and E1ml are applied to input terminals 5R, 5G, and 511, respectively, and the signal processing circuit 4
After signal processing by R, 4G, and 4B, the X driver circuit 2B.

2G and 2fi, and outputs a drive signal for the liquid crystal panel to the signal electrode.

The driver circuit consists of a shift register and a sample and hold circuit, and is converted into IO, but in order to fully drive one LCD panel, an X driver circuit is used.

Several drive ICs are required for each X driver circuit.

FIG. 6 shows an example of a projection type liquid crystal color image display device using the liquid crystal panel described above. The white light W from the lamp 10D) with a reflection mirror 11 is collimated by the condenser lens 12, and after passing through the heat absorption filter 13, it is transmitted to the two dichroic mirrors 14 and 15.
The wavelength is separated into red, green, and blue monochromatic light, and the liquid crystal panel 1R
The red light R9 is bent by the mirror 17 (the green light G is used for the panel 1G).

The liquid crystal panel IBVC is supplied with blue light B with one optical path bent by the i-sea 16.

The light from each LCD panel is projected by a 18R118G lens.
, 18B creates a picture on the screen 19.

A full-color enlarged image is displayed, and a full-color enlarged mountain view is displayed.

[Problem to be solved by the invention]

As shown in FIG.
The distance between 18G and 18B is - (w -) - Wd), which is the width of the liquid crystal panel.
If the distance fL between 9 and the projection lens 18G is the concentration angle α.

can be expressed by the following formula.

The convergence angle α is proportional to the increase in the width i of the driver circuit portion.

The red and green on the screen become larger.

There were problems such as an increase in the convergence deviation of blue strokes and color unevenness in which the hue of one reproduced image changes in the direction in which the image on the screen is viewed.

It was. Since each liquid crystal panel requires an expensive drive IC, there is a problem in that the projection type liquid crystal painter display device cannot be made inexpensive.

The purpose of the present invention is to reduce convergence shift and single color unevenness,
An object of the present invention is to reduce the manufacturing cost of a projection type liquid crystal color painter's display device that displays high-quality images.

[Means to solve all problems]

The above purpose is to connect the fixed electrodes or signal electrodes of multiple liquid crystal panels in common and drive them with a common driver circuit, so that the width wa'l of the driver circuit portion where adjacent liquid crystal panels are adjacent to each other is almost zero. This is achieved by:

[Effect]

The present invention makes it possible to reduce the distance (v7+Wd) between the nine liquid crystal panels as shown in FIG. 6 by approximately w-J by sharing the driver circuit that moves the liquid crystal panels, thereby reducing the concentration angle α. Convergence shift 1 color unevenness, 2
The manufacturing cost of the projection type liquid crystal color image display device can be reduced.

〔Example〕

An actual example of the present invention will be explained below from one side.

Embodiment 1 FIG.
It is composed of 480 pixels in the vertical direction Y.

The liquid crystal panel is of twisted nematic type, with a transparent common electrode formed on one glass substrate by narrowing the liquid crystal material (not shown), and a transparent common electrode formed on the other glass substrate.
40 x 480 transparent pixel electrodes e(1,1), e(
2,1), ---, e(640,480) are formed in a matrix. As shown in FIG. 3, the pixel electrode e (
1, 1) ~ e (640, 480) Switching elements (field effect transistors FE
T) T(1,1) to T(640,4130) are provided, and these ? The source electrode of IT is the pixel electrode e(1,1
) to e(640, 480), respectively.

The attached capacity 'kt Cs is connected (C8 is the liquid crystal capacity tco
The function is to compensate for the discharge of the load through a resistor R8 such as a liquid crystal resistor, thereby increasing the driving efficiency of the liquid crystal, but it may be omitted).

Return to Figure 1.℃, x driver circuits 2R, 2G.

2Bl-i each consists of a 640-stage horizontal shift register i and a sample hold circuit, and has a temperature of ℃'1-39. terminal 6
It is also controlled by the supplied clock signal CLJ and the start signal 8T2 supplied from the terminal 7. Terminal 5R,
5G and 5B yc are simultaneously supplied with separate red primary color signal SR, green primary color signal SQ, and blue primary color signal sB, and each color primary color signal is processed into one field by signal processing circuits 4R, 4G, and 4BK! 5VC converted into an AC signal with inverted polarity fJ<, X driver circuit 2R, 2G, 21
VCL 9.640 pixel signals for one horizontal period are sampled and held. X driver circuit 2R, 2G, 2
The 640 output terminals of B are connected to each liquid crystal panel IR, IG, 1
B signal electrode Lll h 52m..., L, 4°K-
Connected - FETT (+, +) ~ T (+ + cm.)
The drain of T (64°, 1) to T
The drain of (640, 4g.) terminals the signal and is commonly connected to 1c at 4°.

The Y driver circuit 5 is a 480-stage vertical shift register, and a clock signal +; C4Ly is supplied to the element 8.

It is controlled by a start signal EITy supplied to terminal 9. The output spores of 30,480 Y driver circuits are sent to the scanning electrodes 'I r 'l of the liquid crystal panels IR, IC, and IB.
...J, joK are connected and Fl of each panel! :T T(
1, I), ~TL11640) #-r T(+, 4g
o J to T (6471, 410) are commonly connected (the method of commonly connecting the scanning electrodes of each G-crystal panel IR, IG, 1B is shown in the first page. Scanning of each panel is connected to the upper pole (℃ is also good)
.

Therefore, the finished panel Hti shown in Fig. 1 is sandwiched between two 114 original plates (without white water), and when illuminated with red light T, the pixel electrode e
(++l)~e(640yaao)K are applied to each red primary color signal 8RK, and the transmittance is controlled for each pixel, making it possible to display a red color. Similarly, the liquid crystal panels IC and IB are also capable of displaying a full green and blue image, respectively.

FIG. 2 shows a projection-type liquid crystal color image display device using the liquid crystal panel of the present invention.'ri, crystal panel IR.

IG and IB are arranged in a straight line in the horizontal direction, with a green liquid crystal panel IGf in the center and red liquid crystal panels 1 on the left and right.
n, 'ft color liquid crystal panels IB are arranged.

The white light W from the lamp 101 and the reflecting mirror 11 is converted into parallel light by the condenser lens 121C, and then passed through the heat absorption filter 16.
After passing through the blue reflection dichroic mirror 14°, the red reflection dichroic mirror 15 and the optical path changing mirror 16.
17, red light R1, green light G, and blue light B are supplied to liquid crystal panels IR, 1G, and IB, respectively.

The images on each LCD panel are projected by the projection lenses 18R and 18G, respectively.
.

18B, it is possible to obtain an enlarged full-color moving image imaged on the screen 19.

In this actual WJ example, all the Y driver circuits of the liquid crystal panels are made common, so the distance between nine adjacent liquid crystal panels is larger than the pixel spacing within the liquid crystal panel.

Compared to the case where each liquid crystal panel has an icY driver circuit, 1. Since it can be made very small, the focusing angle α (α lines − 1 < α
. ), the convergence shift and color unevenness can be completely reduced, and high-quality reproduced images can be obtained.

Embodiment 2 Embodiment 2 uses a plurality of monochrome liquid crystal panels (in the following description, four liquid crystal panels are used) to obtain a high-resolution painter.

The liquid crystal panel is a monochrome liquid crystal panel that performs twisted nematic operation and is composed of 520 pixels horizontally and 240 pixels vertically. As shown in FIG. 4, the liquid crystal panels 20, 21, 22, and 23 are connected in common to the 640 output terminals of the The signal electrodes 21 and 25 are commonly connected. Also, the X driver circuit 25
The 480 output terminals of the LCD panel 20, 21, 2
The scanning electrodes 2 and 26 are made common and connected.

The images on the four liquid crystal panels are each projected by four projection lenses, and are combined on the screen so that there are no gaps between the four liquid crystal panels.
Approximately 2 times more horizontally and vertically than when using 9 LCD panels.
It is possible to obtain double the resolution and reproduce high-resolution monochrome paintings.

〔Effect of the invention〕

According to the present invention, it is possible to reduce the convergence shift and color unevenness of a projection type liquid crystal color screen display device, to obtain a high-quality image, and to reduce the manufacturing cost of the liquid crystal panel by sharing the driver circuit. , it is possible to provide a projection type liquid crystal color image reproduction device with high image quality and low cost.

By using a liquid crystal panel with a small number of pixels (191), it is possible to display a monochrome image with high resolution, so the yield of the liquid crystal panel is better than that of a high-density liquid crystal panel, and costs can be reduced. Furthermore, by using a common driver circuit, it is possible to provide a high-resolution, low-cost projection type liquid crystal display device.

[Brief Description of the Drawings] Fig. 1 is a configuration diagram of a liquid crystal panel according to an embodiment of the WJl of the present invention, and Fig. 2 is a configuration diagram of a projection type liquid crystal color image display device using the liquid crystal panel of Fig. 1. 3 is an explanatory diagram of a pixel portion of a liquid crystal panel, and FIG. 4 C is a configuration diagram of a liquid crystal panel used in a second embodiment of the present invention. FIG. 5 is a block diagram of a conventional liquid crystal panel, and FIG. 6 is a block diagram of a projection type liquid crystal color image display device using the liquid crystal panel of FIG. 2R, 2G, 2B, 24 ・X driver circuit. 3.25...Y driver circuit. L, , L2. ..., L, 4°...signal electrode. 2, , L2. ..., J4. . ...Scanning electrode. Towards the end~-'! M (nikumata,) continuation times

Claims (1)

[Claims] 1. In a matrix type image display device in which a plurality of signal electrodes and scanning electrodes intersecting the signal electrodes are laminated with electro-optic material at their respective intersections, and pixels are arranged in a matrix,
A matrix type image display device characterized in that scanning electrodes or signal electrodes of a plurality of matrix type image display devices are commonly connected and driven by a common driver circuit.