JPS59133A - Liquid crystal display - Google Patents

Abstract

PURPOSE:To reduce contact resistance in a liquid crystal display using bases provided with each orientation film made of a compd. having an imide group on each transparent electrode, by coating lead parts with a specified conductive resin adhesive agent and then connecting them with external circuits. CONSTITUTION:Base glass plates 1, 2 each provided with a transparent common electrode 3, transparent segment electrodes 4 are immersed into a soln. of an orienting agent consisting of a resin having an imide group, and then, it is heat- treated at about 350 deg.C for an hour to form orienting films 5, 5. Liquid crystals 7 are sealed into a cell formed with said glass plates 1, 2, lead parts are coated with a conductive adhesive 8 contg. an amine type hardening agent, lead frames 9 are fixed, and coated with an insulating adhesive 10 used for molding, and heated at about 60 deg.C for 2hr. Since the resin having the imide group is hydrolyzed by the catalytic action of said amine and removed at that heat treatment, the contact resistance between the lead parts and the lead frames 9 is reduced.

Description

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

Conventionally, a liquid crystal display device is formed on a transparent electrode 3.4, typically made of indium oxide or tin oxide, formed on a glass substrate IK, typically made of polyimide. A film of alignment agent 5 (hereinafter referred to as P, ①) containing a liquid crystal imide group is formed, and the portion of the transparent electrode outside the cell (hereinafter referred to as lead) is used as a terminal for electrical connection. Take structure.

However, since the insulating material P coating exists on the leads, the contact resistance of the leads becomes extremely large. In addition, since the film of the P process is a thin film with a thickness of 500 8 or less, the contact resistance varies widely due to the large number of pin poles. However, masking only the lead portions when forming the alignment film poses problems in workability and is extremely costly.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and a conductive resin with tight adhesion, typified by a conductive adhesive using an amine as a hardening agent, is applied to the II-do part by screen printing. , applied by a method such as disbenswing,
It is cured, and when it is cured, it is oxidized by the catalytic action of the amine to force water to decompose the P resin. Furthermore, the dual structure has metal frame legs attached to the lead part. in. In a package (hereinafter referred to as D-type display device), the present invention includes:
Particularly effective.

Hereinafter, the present invention will be explained in detail according to Examples. Figure 2 shows D
This is an example of an IP type liquid crystal display panel.

1 is the upper panel glass, 2 is the lower panel glass, 3 is the common electrode, 4 is the segment electrode, 5 is the alignment film, 6 is the adhesive, 7 is the liquid crystal, 8 is the conductive adhesive, 9 is the lead frame, and 10 is the adhesive. A common electrode 3 and segment electrodes 4 made of indium oxide are formed on panel glasses 1 and 2, which are adhesives for molding, respectively. Next, the glass was 3 wt% of PI
After immersing in pyrrolidone solution and pulling out, it was heated to 350℃ for 1
Bake for an hour. After filling the liquid crystal 7 and assembling the cell, 1
1- Apply a conductive epoxy adhesive containing an amine curing agent and insert the lead frame 9.
Heat it at 60℃ for 2 hours to harden it and mold it with insulating adhesive.

A transparent electrode pattern for resistance measurement with a width of 1 line in the shaded area in Figure 2 is formed in advance in the panel, and the resistance R1 between B1 and B2 and the lead frame before applying the conductive adhesive are formed in advance. Resistance Rtf between cl and a2 after insertion: Figure 2 shows the measured results. R1==(3 to Ω, R' with 10 average values)
When j=4, it became Ω. This is the result of the PI film covering the surface of the lead portion being hydrolyzed and removed by the amine.

It is possible to eliminate the increase in resistance due to PI, and a liquid crystal display device with excellent electrical characteristics can be obtained.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional liquid crystal display panel, and Fig. 2 is a sectional view of a conventional liquid crystal display panel.
FIG. 3 is a front view of the liquid crystal display panel of the present invention, FIG. 3 is a sectional view taken along A-AI in FIG. 2, and FIG. 4 is an explanatory diagram showing changes in lead resistance. 1°, upper panel glass 2°. Lower panel glass 3. Common electrode 4°. Segment electrode 5°, alignment film 61. Adhesive 7. LCD 8. Conductive adhesive 9. Lead frame 106. Mold adhesive
Daini Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami

Claims (1)

[Claims] In a liquid crystal display device in which a liquid crystal is sandwiched between a pair of substrates having transparent electrodes, a conductive material containing an amine as a curing agent is applied on a compound layer having all imide groups formed on at least one of the transparent electrodes. A liquid crystal display device characterized by adhering a synthetic resin.