JPH01265229A - 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 is an iri crystal display! ! between devices.

[Technology from 1] In general, a matrix type liquid crystal display device includes a pair of substrates having data lines and scanning lines on at least one substrate to take advantage of the electro-optic effect of alpha crystals, and a peripheral seal. It consists of a structure in which poems are written using members and liquid crystals are inserted into the gaps between them. Conventionally, as shown in FIG. 2, the data line 1 and the scanning line 2 are made of different materials in an active matrix type moat crystal display device, and therefore have different film thicknesses.

The film thickness of the same material i4 also differed due to process considerations.

[The invention tries to solve the problem!] ! However, in the prior art described above, since the film thicknesses of the data line and the scanning line are different, the cell gap of the liquid crystal differs by at least the difference in film thickness of the two line materials, and LI! The larger the difference in thickness, the
1. The narrow cell gap of the liquid crystal has a large effect on the optical effect of the liquid crystal. In particular, when ultraviolet curable resin is used as a sealing member, there is no effect of heat during curing, so the difference in the film thickness of the 121 material directly becomes the difference in the cell gap of the α crystal, resulting in uneven cositometry, response unevenness, and There is a problem that uneven display occurs.

Therefore, the present invention: i. To solve such problems,
The objective is to eliminate display irregularities such as contrast irregularities, response irregularities, and color irregularities, and to obtain a liquid crystal display device with uniform and high image quality.

[Measures for solving problem tIl] The liquid crystal display device of the present invention has a structure of 1α on at least one substrate.
In an αα crystal display device, a pair of substrates equipped with means for controlling the electro-optic effect of the crystal are held by a peripheral sealing part, and a liquid crystal is sealed in the gap between them. A feature is that a pattern for the gap Ml is formed so that the thickness is uniform.

[Example] Embodiments of the present invention will be described below with reference to Figure 22.

FIG. 1(a) is a top view of the 11-item display device of the present invention, and FIG. 1(b) is a cross-sectional view of the liquid crystal display device of the present invention.

First, a polysilicon thin film transistor is formed on the transparent substrate 3 by the following steps (1) to (8) as means for controlling the electro-optic effect of the εα crystal.

(1) 4g pressure CVD polysilicon film that will become the channel part
and patterning.

(2) A gate degraded film is formed by thermal acid method 1-2.

(3) A polysilicon film that will become the scanning line 2 and gate electrode is formed by low pressure CvD to a film thickness of 3500A, and
(Turning.

(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 Sa it III to close the contact hole.

(7) 15 data lines M'f 4 poles 4 and gap control pattern■ And Naro ITO! II was deposited using a sputtering method to a film thickness of 5000 μm and patterned. At this time, it is preferable that the pattern I+ for the gaple 1i# be separated into islands and formed in order to avoid short circuiting with the wiring 11.

(8) As a deep film, 5iOall is formed by mask sputtering except for the mounting terminal portion.

Next, a color filter layer 6 is formed on the transparent substrate 5,
I as common 1ftff+7 on the color filter layer
A TO film is formed on the entire surface of the base by sputtering to serve as a counter substrate.

Then, polyimide is applied to each of the pair of substrates as a mini-alignment film, baked, and then rubbed.Using an ultraviolet curable resin mixed with a spacer 8 as a sealing member 9, the pair of substrates are bonded together and pressed, and then irradiated with ultraviolet rays. The sealing member is cured, and a liquid crystal cell having a predetermined gap is sealed.

Finally, after enclosing iα crystal 1O,! In this implementation, the data line 1, the pixel electrode 4, and the gap control pattern 11 were formed in the same process to form a thick film. However, in a separate process, a gap control pattern was formed to make the film thicker than that of the data line and scanning line, and the film thickness of the part where the sealing member contacts May be equal.

Also, the thinner film thickness lSi! A gap control pattern is formed on the wire material and the lI is applied to the thicker wiring material.
H may be made to be the same.

Furthermore, in this embodiment, the gap Mvs pattern is arranged &! Although it is formed on the material substrate, the same effect can be obtained even if it is formed on the opposing substrate side.

[Effects of the Invention] As explained above, the present invention provides a gap control pattern so that the film thickness is uniform in the part where the sealing material contacts, so that the cell gap of the liquid crystal is aligned between the data line side and the scanning line side. As a result, display unevenness such as contrast unevenness, response unevenness, and color unevenness is significantly improved, resulting in a jαα crystal display device 14 having high image quality. In addition, when an ultraviolet curable resin is used for the sealing member, the cell gap can be easily controlled.

Cost reduction was also achieved through mass processing.

[Brief explanation of the drawing]

FIG. 1(a) is a top view of the i (two-item display device) of the present invention;
FIG. 1(b) is a sectional view of the liquid crystal display device of the present invention;
The figure is a cross-sectional view of a liquid crystal display device according to 1. 1, data line 2, scanning line 3, transparent substrate 4, pixel electrode 5, transparent substrate 6, color filter layer 7, common electrode 8, spacer 9, sealing member lOl, alpha crystal Il, gap control pattern and above Applicant Seiko Epson Corporation Representative Patent Attorney Masayoshi Kamiyanagi (and 1 other person) (α) (b) Figure 1 Figure 2

Claims (2)

[Claims] (1) In 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-optic effect of the liquid crystal, is held by a peripheral sealing member, and liquid crystal is sealed in the gap between the substrates, the sealing member 1. A liquid crystal display device characterized in that a gap control pattern is formed so that the film thickness is uniform in the portion where the two contact each other. (2) The liquid crystal display device according to item 1, wherein an ultraviolet curable resin is used for the sealing member.