JPS6361670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a matrix liquid crystal display panel that can obtain good alignment.

It has a plurality of row electrodes and a plurality of column electrodes, and in order to eliminate crosstalk that tends to occur at non-display points when operated using a multiplex drive method, a switching element is installed for each picture element configured at the intersection of the matrix. Installation is underway. As an example, the structure of a matrix liquid crystal display panel using sintered varistors as switching elements is shown in FIGS. 1 and 2.

A row electrode 3 is provided on the lower substrate 1, then a varistor layer 5 and a metal electrode layer 6 are laminated, and a transparent electrode 7 is provided in a portion that contacts the metal electrode layer 6 and becomes a picture element. On the other hand, transparent column electrodes 4 are provided in stripes on the upper substrate 2 through the portions that will become picture elements. Then, each of the substrates 1 and 2 is coated with an alignment treatment layer 10 by a method such as oblique vapor deposition such as SIO, rubbing, etc.
are provided, and the parts to be picture elements are sealed with a sealing material 9 mixed with a spacer so as to have an appropriate gap so as to face each other. The liquid crystal 8 with positive dielectric anisotropy filled in this gap is caused to lie in one direction by the above-mentioned alignment treatment, and between the upper and lower substrates 1 and 2.
It has a 90° twist structure. Further, polarizing filters 11 and 12 are provided above and below the display panel. Furthermore, 13 is a light source, and 14 is an observer.

The thickness of the varistor element, including the thickness of the electrode, is 5~
The thickness of the varistor element is 50 μm, and the varistor element protrudes above the lower substrate. Therefore, when alignment processing is performed by oblique vapor deposition, depending on the incident angle of the vapor deposition beam, there may be areas that are not vapor deposited because they are in the shadow of the varistor element, making it impossible to obtain good alignment over the entire surface. . Furthermore, when alignment treatment is performed by rubbing, since the varistor elements protrude above the substrate, the polishing cloth may get caught on the varistor elements and the polishing cloth does not come into uniform contact with the substrate. The disadvantage is that good orientation cannot be obtained.

The present invention aims to eliminate the above-mentioned drawbacks and obtain good alignment in a matrix liquid crystal display panel.

FIG. 3 is a structural sectional view of a matrix liquid crystal display panel according to the present invention, and the same parts as above are given the same numbers.

After forming the row electrodes 3, varistor layer 5, and metal electrode layer 6, an insulator 15 is filled to the same height as the metal electrode surface in order to flatten the surface of the substrate 1. One manufacturing method is to apply low-melting glass 16 over the entire surface to a thickness equal to or greater than the total thickness of the varistor element, as shown in FIG. A flat surface as shown in FIG. 4B can be obtained. The transparent electrode 7 is formed on the flat surface obtained in this way, and the alignment treatment layer 10 is applied.Since the surface of the substrate 1 is flat, the above-mentioned drawbacks due to the unevenness are eliminated, and a uniform layer is formed over the entire surface. The alignment of liquid crystal 8 was obtained.

In the above embodiments, low melting glass was used as the insulator, but in the present invention, in addition to the low melting glass, epoxy,
Plastics such as polyester and polyimide can be used to achieve similar effects.

In addition, in the TN (twisted nematic) field effect liquid crystal display system, the varistor section is non-transparent, making it impossible to display images, so in order to increase the display area, the area of the varistor section and row electrodes must be made as small as possible. was necessary for good display. However, as shown in FIG. 5, the present invention uses a white scatterer 17 made of a fired mixed powder of ZnO and glass as an insulator to eliminate unevenness, and also changes the liquid crystal display method to an anisotropic dye absorption method. By using a gender-based display, that is, a guest-host system, it was possible to form a displayable portion over almost the entire surface. At the same time, there was no need to reduce the areas of switching elements and row electrodes, making it possible to easily create a matrix liquid crystal display panel. In FIG. 5, 18 is a liquid crystal to which an absorption anisotropic dye is added.

In the above example, a white scatterer made by firing a mixed powder of ZnO and glass was used, but _other materials such as _Al2O3 , _TiO2 ,
A similar effect could be obtained by dispersing a white powder such as ZrO ₂ in an insulating plastic.

As described above, the present invention proposes a matrix liquid crystal display panel in which uniform liquid crystal alignment can be obtained over the entire surface, and its practicality is great.

[Brief explanation of drawings]

FIG. 1 is a schematic top view of a conventional matrix liquid crystal display panel, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, and FIG. 3 is an embodiment of the matrix liquid crystal display panel according to the present invention. Cross-sectional view shown in Fig. 4A,
FIG. 5 is a sectional view showing another embodiment of the panel of the present invention. 1...Substrate, 5...Switching element (varistor layer), 8, 18...Liquid crystal, 15...Insulator, 1
6...Low melting point glass, 17...White scatterer.

Claims (1)

[Claims] 1. Two substrates facing each other with a liquid crystal layer in between, and a switching element layer for each picture element on the row or column electrodes provided on the slightly further substrate, and furthermore, A group of switching elements formed to protrude from the surface of the substrate by laminating a metal electrode layer thereon, and a group of switching elements that are filled on the substrate between these switching elements, the upper surface of which is approximately the upper surface of the switching element. 1. A matrix liquid crystal display panel comprising an insulating layer formed on the same plane, and an alignment layer formed on the switching element and the surface of the insulating layer. 2. The matrix liquid crystal display panel according to claim 1, wherein the switching element is a varistor. 3. The matrix liquid crystal display panel according to claim 1, wherein the insulator is a low melting point glass. 4. The matrix liquid crystal display panel according to claim 1, wherein the insulator is a plastic such as epoxy, polyester, or polyimide. 5. The matrix liquid crystal display panel according to claim 1, wherein the insulator is mainly composed of a white scatterer such as ZnO, Al ₂ O ₃ , TiO ₂ , ZrO ₂ or the like.