JPH01267518A - liquid crystal display device - 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] [Industrial application field] The present invention relates to a liquid crystal display device.

[Prior Art] In general, a matrix type liquid crystal display device includes a pair of substrates, each of which has a data line and a scanning line for controlling the electro-optical effect of the liquid crystal, held through a spacer and a seal member. It has a structure in which the liquid crystal is held in the gap between the two. Conventionally, as shown in Figure 2, the data line 1 and the scanning line 2 are made of different materials, especially in an active matrix type liquid crystal display device, so the film thickness may be different, or the same material may be processed differently. Due to the above reasons, the film thickness was different. Further, the spacer used had a diameter of 100 mm.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since the film thicknesses of the data line and the scanning line are different, the cell gap of the liquid crystal is different by at least the difference in the film thickness of the wiring material, and the difference in film thickness is The larger the cell gap, the narrower the cell gap of the liquid crystal, the greater the influence on the electro-optical effect of the liquid crystal.In particular, when UV-curable resin is used for the sealing material, there is no effect of heat during curing, so the film thickness of the direct wiring material increases. This difference results in a difference in the cell gap of the liquid crystal, which poses a problem in that display unevenness such as contrast unevenness, response unevenness, and color unevenness occurs. - Therefore, the present invention is intended to solve such problems, and its purpose is to eliminate contrast unevenness, response unevenness,
The objective is to eliminate display irregularities such as color unevenness and obtain a liquid crystal display device with uniform and high image quality.

[Means for Solving the Problems] The liquid crystal display device of the present invention includes a pair of substrates, at least one of which is provided with a means for controlling the electro-optic effect of liquid crystal, held via a spacer and a sealing member, A liquid crystal display device in which a liquid crystal is sealed in the gap is characterized in that the diameter of the spacer is varied according to the level difference of the base material in contact with it [Embodiment] An embodiment of the present invention will be described below based on the drawings. do.

FIG. 1(a) is a top view of the liquid crystal display device of the present invention, and FIG. 1(b) is a sectional view of the liquid crystal display device of the present invention.

First, as a means for controlling the electro-optic effect of liquid crystal on a transparent substrate 3, a polysilicon thin film transistor as shown below (
It is formed by steps 1) to (9).

(1) Low pressure CVD for polysilicon film that will become the channel part
and patterning.

(2) Form a gate oxide film by thermal oxidation.

(3) Form a Borin 1-no-con film that will become the scanning line 2 and gate electrode to a thickness of 4000 by low pressure CvD,
pattern.

(4) Phosphorus ions are implanted to form source and drain regions.

(5) A SiO2 film is formed as an interlayer insulating film by CVD.

(6) Patterning the interlayer insulating film to open contact holes.

(7) An A1 film that will become the data line 1 is formed to a thickness of 8000 Å by sputtering and patterned.

(8) A 6ITO film, which will become the pixel electrode 4, is formed to a thickness of 2,000 mm by sputtering and patterned.

(9) As a protective film, a SiO2 film is formed over the entire surface of the substrate except for the mounting terminals by mask sputtering.

Next, a color filter layer 6 is formed on the transparent substrate 5,
On the color filter layer, an ITO film is formed as a common electrode 7 over the entire surface of the substrate by sputtering.

Then, polyimide is applied as an alignment film to each of the pair of substrates, and after baking, a rubbing process is performed, and a seal portion is formed by screen printing twice.

Here, as the sealing member 9a on the data line side, 6°2μ
Using an ultraviolet i-curable resin mixed with a spacer 8a having a diameter of 6.6μ as the scanning line side sealing member 9b,
An ultraviolet curing resin mixed with a spacer 8b having a diameter of is used. Further, as a spacer, glass fiber, glass pole, resin ball, etc. are used.

After the pair of substrates were bonded together and pressed together, the sealing member was cured by irradiation with ultraviolet rays to obtain a liquid crystal cell having a predetermined gap.

Finally, after the liquid crystal 10 was sealed, an ultraviolet curing resin was applied to the sealing opening to seal it, thereby obtaining a liquid crystal display device.

In this embodiment, the spacer is formed only in the seal member, but it may also be formed in the pixel portion.

However, in this case, a spacer having a diameter of 6.8μ is used.

[Effects of the Invention] As explained above, in the present invention, by varying the diameter of the spacer according to the level difference in the contacting base material, the cell gap of the liquid crystal does not differ between the data line side and the scanning line side. As a result, display unevenness such as contrast unevenness, response unevenness, and color unevenness was significantly improved, and a liquid crystal display device with high image quality was obtained. Furthermore, when an ultraviolet curable resin is used in the sealing member, the cell gap can be easily controlled, and costs can be reduced through mass processing. −

[Brief explanation of the drawing]

FIG. 1(a) is a top view of the liquid crystal display device of the present invention;
FIG. 2B is a sectional view of a liquid crystal display device according to the present invention, and FIG. 2 is a sectional view of a conventional liquid crystal display device. 1, data line 2, scanning line 3, transparent substrate 4, pixel electrode 5, transparent substrate 6, color filter layer 7, common electrode 8, &1. 8b, spacer 9%, 9b
, seal member 10, liquid crystal (α)

Claims (2)

[Claims] (1) A liquid crystal display device in which a pair of substrates, at least one of which is equipped with a means for controlling the electro-optical effect of the liquid crystal, is held via a spacer and a seal member, and the liquid crystal is sealed in the gap between the two substrates, A liquid crystal display device characterized in that the diameter of the spacer is varied according to the level difference of the base material in contact with it. (2) The liquid crystal display device according to item 1, wherein an ultraviolet curable resin is used for the sealing member.