JPH02220031A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To equalize adhesive strength, a coefficient of heat expansion, etc., to uniform the cell gap of liquid crystal, and to improve display irregularities such as a contrast irregularity, a response irregularity, and a color irregularity by using resin of the same base for a seal member and a conductive member. CONSTITUTION:On the side of a transparent substrate 3 where a color filter layer 4 and a counter electrode 5 are formed, the conductive member 6 is formed by various printing method such as a screen printing method or a dispensing method. Then the seal member 7 is formed on the side of the other transparent substrate 1 by the screen printing method by using a material formed by mixing a prescribed amount of glass fiber of 7.5mum with ultraviolet- ray setting type resin consisting principally of epoxy modified (meth)acrylate. Then the couple of substrates where the seal member 7 and conductive member 6 are formed are stuck and pressed, and the seal member is set by irradiating with ultraviolet rays to obtain a liquid crystal cell which has a prescribed gap.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid crystal display device.

[Prior Art] Generally, a liquid crystal display device includes a pair of substrates, at least one of which has a means for controlling the electro-optic effect of the liquid crystal, and a sealing member that does not react with the liquid crystal and has good adhesion to the substrate. The high-quality epoxy resin was held in a square shape, and the conductive member was held in place using a low-resistance metal paste, and the liquid crystal was held in the gap between them.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since the sealing member and the conductive member are made of different materials, their adhesion and thermal expansion coefficients are also different, and they may peel off due to thermal shock, etc. When ultraviolet curable resin is used for the first part and the second part, especially since the first conductive member is a thermosetting material, there are problems such as reactions between the materials and deterioration of the sealing member when the conductive member is thermoset. .

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a liquid crystal display device that improves reliability and allows the use of ultraviolet curable resin as a sealing member, thereby making it possible to mass-produce the device at low cost. There it is.

Means for Solving the Problems] The liquid crystal display device of the present invention includes a pair of substrates each having a means for controlling the electro-optic effect of the liquid crystal on at least one substrate, which is held by a peripheral sealing member, and In a liquid crystal display panel in which upper and lower substrates are connected via conductive members and a liquid crystal composition is held in the gap between them, the same base resin is used for the sealing member and the conductive member.

[Example] An example of the present invention is explained below based on the drawings in FIG.
α) 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, a polysilicon thin film transistor (TIPT) was placed on a transparent substrate 1 as a means for controlling the electro-optic effect of liquid crystal.
) form 2.

Next, a color filter layer 4 is formed on the transparent substrate 5,
A counter electrode 5 is formed on the color filter layer.
! iE is formed on the entire surface of the substrate by sputtering. Then, polyimide is applied as an alignment film to each of the pair of substrates, baked, and then rubbed.

Here, on the side of the transparent substrate 5 on which the color filter layer 4 and the counter electrode 5 are formed, the conductive member 6 prepared as described in (1) and (2) below is formed by various printing methods such as screen printing method or dispensing method. do.

(1) A predetermined amount of a 10 μm glass fiber gold-plated spacer is mixed into an ultraviolet curable resin whose main component is epoxy-modified (meth)acrylate. Here, if the spacer ratio is less than 5%, it will result in poor conduction, and 50%
If it is more than that, the gap will be defective, so the content should be 5 to 50 wt%.

(2) Add silver powder to adjust viscosity.

Here, if the viscosity of the ultraviolet curable resin is appropriate, silver powder may not be used. In this example, screen printing is used, so too o'o~300α0cp
The viscosity was adjusted to ai degree.

Then, a sealing member 7 is formed on the other transparent substrate 1 by screen printing using an ultraviolet curing resin whose main component is epoxy-modified (meth)acrylate mixed with a predetermined amount of 15 μm glass fiber. .

Here, the resin used for the sealing member and conductive member is not limited to a resin based on epoxy-modified (meth)acrylate, but any resin that does not react with the liquid crystal may be used, such as thermosetting epoxy resin or ultraviolet curing resin. Examples include resins based on polybutadiene-modified (meth)acrylate or resins based on a mixture of epoxy-modified (meth)acrylate and polybutadiene-modified (meth)acrylate.

Next, the above-mentioned pair of substrates on which the sealing member 7 and the conductive member 6 were formed were bonded and pressed together, and then ultraviolet rays were irradiated to harden the sealing member, thereby obtaining a liquid crystal cell having a predetermined gap.

Finally, after the liquid crystal 8 was sealed, an ultraviolet curing resin was applied as a sealant 9 to the sealing opening to obtain a sealed 1-1 liquid crystal display device.

In this embodiment, the conductive member was formed on the color filter layer side and the sealing member was formed on the TPT side, but they may be formed on opposite substrates. Further, the sealing member and the conductive member may be formed on the same substrate side.

[Effects of the Invention] As explained above, in the present invention, by using the same base resin for the sealing member and the conductive member, the adhesion and coefficient of thermal expansion become equal, and the cell gear lacquer of the liquid crystal becomes uniform. Display unevenness such as contrast unevenness, response unevenness, and color unevenness has been significantly improved, and a liquid crystal display device with high image quality has been obtained, and reliability has also been improved. Furthermore, when ultraviolet curable resin is used for the sealing material, it is possible to more easily control the sergy and yap, there is no misalignment, and the display quality is improved, and costs can be reduced through mass processing. .

[Brief explanation of the drawing]

FIG. 1 (α) is a top view of the liquid crystal display device of the present invention;
Figure Cb) is a sectional view of the liquid crystal display device of the present invention. 1...Transparent substrate 2...Polysilicon thin film transistor (TF'T) 3...Transparent substrate 4... ...Color filter layer 5...
...Counter electrode 6...Conducting member (ultraviolet curing resin) 7
・・・・・・・・・Seal member (ultraviolet curable resin) B
・・・・・・・・・Liquid crystal 9・・・・・・・・・Encapsulant and above Applicant: Seiko Epson Co., Ltd. Agent Patent attorney: Masayoshi Kamiyanagi (1 other person) Figure (αn diagram (b)

Claims (2)

[Claims] (1) 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 the upper and lower substrates are connected via a conductive member, and the gap between them is 1. A liquid crystal display device holding a liquid crystal composition, characterized in that a sealing member and a conductive member are made of the same resin. (2) The liquid crystal display device according to claim 1, wherein the resin is an ultraviolet curing resin.