JPS6041086A - Liquid crystal color projection apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Ichime;-Double 1 I1 IJ---'- This is related to the arrangement of color filters for color filters.

An object of the present invention is to provide a 7A product color projection device with high resolution and to embody a color projection television.

Conventionally, large-scale projection televisions use a projection tube centered on the primary color I to project the primary color 1A' in an enlarged manner.

However, the projection tube is located at the station, and it is difficult to increase the screen brightness. The present invention uses a receipt display to realize a relatively inexpensive and bright glow projection television.

Hereinafter, the present invention will be explained in detail based on the IA aspect.

FIG. 1 shows the gift display panel of the present invention V11. T E', T and image electrodes 3 are formed on a relatively thick glass substrate 1, and a shaped liquid crystal 5 is sealed all over the inside of the i-sized glass or transparent plastic substrate 2. A transparent substrate 6 with a color filter layer 7.8 is placed on top of the substrate 2, and the whole is sandwiched between upper and lower polarizing plates 9, 10.

11 is a liquid crystal sealing section. Color filter layer 7 is red,
It is a filter that allows one of the three primary colors of blue or green to pass through, and color filter J'l'J8 is a black filter that does not allow light to pass through. The black filter is for preventing light from passing through, and may be one coated with metal or the like. The three primary color filters 7 and the black filter 8 form a striped pattern extending horizontally on the display screen, just as one of the three primary colors passes through the blind. This relationship is shown in diagram Hs2. (a) is the turn of the color filter layer, 12 is the part that does not transmit light,
13 is a filter layer corresponding to one of the three primary colors. Below this, as shown in Cb), TPT15 and pixel' electrode 1
Place 4. 16 is the TPT gate drive line, 1
Similarly, 7 is the drain 1 drive line.

At this time, the black filter cap 12 covers the TPTl 5 combination and half of the pixel electrode 14. As a result, when a toothpick (described later) is irradiated with a parallel beam of light from behind the filter, the TFT itself is not hit by the G light force, so the TP
It is possible to prevent the deterioration of T characteristics. Furthermore, in order to display a red image signal, for example, use two channels with red and black filters, and finally combine them on the screen to create a red image. According to the current interlacing of the TV signal, separate display panels can be used for the first half and the second half of the interlacing, which facilitates signal processing. Of course, by overlapping the two images displayed on the screen with a shift of one horizontal line, a picture with no stitching can be obtained over the entire screen. By doing this, half of the pixel electrodes of the screen are divided into 11liIJ elements (2), and the pixel electrodes of the panel are %J'I,JI (compared to 4), which forms twice as dense pixels on 11 display panels. Therefore, the pixel electrode size can be increased.
Same quality as above. Pixel 'Ea moved by j% by TPT
By storing a signal potential in the polar capacitance of the liquid crystal, the polarity can stably maintain the orientation of the liquid crystal at the bilevel even during the non-driving period. Therefore, the electrode capacitance force of liquid crystal; /J
As the voltage increases, self-discharge becomes faster and a stable distribution level cannot be maintained until the next drive signal arrives, resulting in image quality deterioration. Furthermore, when light hits the 'l' FT, the insulation performance of the TPT deteriorates, the leakage resistance decreases, and the discharge of the electrode capacitance charge of the liquid crystal becomes faster, resulting in deterioration of image quality.

As in the present invention, by not exposing the TPT to light, increasing the size of the pixel electrode, and forming the entire screen with two panels for each of the three primary colors, a homogeneous and stable glodijection image can be obtained. It will be done.

FIG. 5 is a conceptual diagram of the glodijection device (t) of the present invention, in which light from a white light source 20 is irradiated to two display panels 18 and 19 for each primary color through a parallel optical path system 22, and a magnifying lens system 26 Focus on the screen 24.

21 is a reflecting mirror.

Although the enlarged projection optical system itself can be used for a 35 mm slide projector, an M adjustment mechanism is required to align a total of six enlarged images on the screen.

In FIG. 4, there are two TV signal blocks for each primary color, the video signal is separated by an interlace separation circuit 25, and one block for each interlace is shown. -5 to the delay circuit system 26.
27, and after being synthesized by the signal synthesis circuit 28゜29, the liquid crystal display panel! , 0.31. As a result, signals from the interlace separation circuit on one side are constantly supplied to one panel, and even if the number of pixels is increased and the pixel capacity is reduced, image quality does not deteriorate. In this case, the delay circuit system is the AD conversion circuit V11. It can be formed using a frame memo 'J + DAi conversion circuit.

Since the projection television has a large screen, it is necessary to increase the image quality by increasing the image quality as much as possible. I
'r Image resolution can be sufficiently increased. In addition, the optical system can be a simple 1-inch 1"4 structure, and the screen width is 1f.
Since m only needs to make the light source brighter, it is easier to raise the LFL by >1 than the existing projection tube, and although 6 panels are used, overall Jl, 'j can be formed at low cost, so the value of use is great. .

[Brief explanation of drawings]

FIG. 1 shows a liquid crystal display panel used in the glossection device of the present invention. 1...Glass substrate 2...Transparent substrate 3...Pixel' electrode 4...Common electrode 5...Liquid crystal layer 6... ... Filter substrate 7 ... Color filter layer 8 corresponding to one of the three primary colors ... Filter layer 9.10 that does not transmit light
. . . Polarizing plate 11 . . . Sealing portion FIGS. 2 (α) and (b) show the positional relationship between the pixel' electrode portion and the color filter portion. 12... Black filter that blocks light 13...
...Color filter 14 corresponding to three primary colors...
... Pixel electrode 15 ... TFT 16 ... Drain 12m line 17 ...
・Gate drive line FIG. 3 is a conceptual diagram of the 10-direction device of the present invention. 18.19...Liquid crystal panel 20...White light source 21...Reflector 22...Parallel optical path system 23...Magnifying lens system 24 ...The screen in Figure 4 has two TV signal blocks of one primary color light. 25...Interlace separation circuit 26', 27
... Delay circuit system 28.29 ... Signal synthesis circuit 30.51 ... Liquid crystal display panel or above Applicant Suwa Seikosha Co., Ltd. Agent Patent attorney Tsutomu Mogami No. 1 Figure (a) (b) Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] j. Active matrix liquid and display panel using TPT, color filter, enlarged projection optical system. In a glojection device consisting of a screen, six types of can filters are used as the can filter: one in which red and black are arranged alternately, one in which green and black are arranged in an alternating manner, and one in which blue and black are arranged in an alternating manner. A number of products characterized by using two liquid crystal display panels for each of the three primary colors, arranged so that half of the pixel's market value and the entire TPT are blocked by a black filter, so that magnified images are displayed superimposed on the screen. Color projection device.