JP2000111938A - Production of liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve adhesiveness of ACF(anisotropically conductive adhesive) with an input terminal of a liquid crystal panel and enhance reliability of the electroconductive connection between the input terminal and an output terminal. SOLUTION: In the method for producing the liquid crystal display device which has a liquid crystal panel having a liquid crystal layer 2 interposed between a couple of substrates 1 and an input terminal 6, and an output terminal for a driving circuit which is electrically connected to the input terminal of the liquid crystal panel, after surface-treating the surface of the above-mentioned input terminal with plasma, the input terminal is electrically connected with the output terminal mentioned above using an anisotropically conductive adhesive 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly to a method for connecting a terminal portion of a liquid crystal panel to a circuit for driving liquid crystal.

[0002]

2. Description of the Related Art For example, as shown in FIG. 1, each human terminal of an electrode substrate 1 of a liquid crystal panel having a liquid crystal layer 2 interposed between a pair of electrode substrates 1 and a control circuit substrate 3 for driving a liquid crystal is connected. In the case of conducting connection with each other, a flexible connection member 4 such as a flexible printed circuit formed by providing predetermined connection wiring on a thin flexible synthetic resin sheet and a control circuit board 3
Is connected by, for example, soldering, and the flexible connection member 4 and the electrode substrate 1 are connected, for example, by a conductive anisotropic adhesive 5 (Anisot).
Aropic Coactive Film, A
(Referred to as CF).

When connecting the flexible connection member 4 and the electrode substrate 1 with the ACF 5, the surface of each human terminal 6 of the electrode substrate 1 is wiped with an organic solvent such as acetone, and then the surface of the electrode substrate 1 is removed. Each input terminal and each input terminal of the flexible connection member 4 are superimposed on each other, and are bonded and fixed by heating and pressing with an ACF 5 interposed therebetween.

[0004]

However, in the above-described prior art, dirt on the surface of each input / output terminal of the electrode substrate cannot be completely removed, and the adhesion between the ACF and each input / output terminal of the electrode substrate is ensured. However, there has been a problem that reliability cannot be significantly reduced.

Further, when the surface of each input / output terminal of the electrode substrate is wiped with a cloth or the like containing an organic solvent such as acetone, glass powder or the like adheres to the cloth, and the input terminals become broken and defective. Had.

Accordingly, the present invention solves the above-mentioned problems, and an object of the present invention is to provide a liquid crystal display device capable of treating the input terminal surface of an electrode substrate in a non-contact manner and ensuring the close contact between the ACF and the input terminal. It is to provide a manufacturing method.

[0007]

According to the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising: an input terminal of a liquid crystal panel in which a liquid crystal composition is sealed in a glass cell formed by vertically opposing transparent electrodes;
In a method of manufacturing a liquid crystal display device in which output terminals of a liquid crystal driving circuit board are electrically connected to each other, the surface of the input terminal of the electrode substrate of the liquid crystal panel is subjected to surface treatment with plasma, and then the liquid crystal driving circuit is formed. The output terminal of the substrate is connected.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

[0009]

Embodiment 1 FIG. 1 shows the structure of a general liquid crystal display device. An Ar plasma treatment was performed on the surface of each human input terminal 6 of the electrode substrate 1 of the liquid crystal panel in which the liquid crystal layer 2 was interposed between the pair of electrode substrates 1.1. The plasma processing apparatus used was a plasma asher manufactured by Tokyo Ohka. Processing conditions were a vacuum of 1.5 Torr, an Ar flow rate of 50 sccm, an output of 500 W, and a processing time of 10 minutes. Using such a liquid crystal panel, each input terminal of the liquid crystal panel and the flexible connection member 4 were connected by the ACF 5. As a result of a temperature cycle test of such a liquid crystal display device, ACF
And the input terminal of the electrode substrate did not peel off. In addition, since the input terminal is not in contact with the surface of the input terminal, a highly reliable liquid crystal display device in which the input terminal is not broken at all is obtained.

Example 2 A liquid crystal display device was constructed in the same manner as in Example 1 except that a liquid crystal panel treated in the same manner as in Example 1 was used except that the gas introduced into the plasma asher was changed to O ₂ . As in Example 1, a highly reliable liquid crystal display device was obtained.

Example 3 The processing conditions were as follows: vacuum degree 1.0 Torr, Ar flow rate 100 sc
A liquid crystal display device was constructed by performing the same processing as in Example 1 except that the output power was set to 800 cm, the output power to 800 W, and the processing time to 10 minutes. Example 1
As a result, a highly reliable liquid crystal display device was obtained.

Although the conductive anisotropic adhesive ACF is used in the embodiment, it goes without saying that the same result can be obtained by heat sealing or the like.

[0013]

As described above, according to the present invention, the surface of each input terminal of the liquid crystal panel is subjected to the plasma treatment, so that the surface of each input terminal can be removed without contact. This has the effect of significantly improving the reliability of the conductive connection with the liquid crystal drive circuit board.

Further, there is no defect such as breakage of the input terminal caused by contact with each input terminal, and there is an effect that the reliability of the liquid crystal display device is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a general structure of a liquid crystal display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrode substrate 2 liquid crystal layer 3 liquid crystal drive control circuit board 4 flexible contact member 5 ACF

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[Procedure amendment]

[Submission date] October 21, 1999 (1999.10.
21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

According to a method of manufacturing a liquid crystal display device of the present invention, a liquid crystal panel having a pair of substrates having a liquid crystal layer interposed is connected to an input terminal provided on at least one of the substrates. A driving circuit having an output terminal, comprising: a step of surface-treating the input terminal surface with plasma; and after the surface treatment, the input terminal and the output terminal. ,
And conducting a conductive connection with a conductive anisotropic adhesive.

Claims (1)

[Claims] An input terminal of a liquid crystal panel in which a liquid crystal composition is sealed in a glass cell formed by vertically opposing transparent electrodes,
In a method of manufacturing a liquid crystal display device, in which output terminals of a liquid crystal driving circuit board are electrically connected to each other, the surface of an input terminal of the liquid crystal panel is subjected to surface treatment with plasma, and then the liquid crystal driving circuit board is processed. A method for manufacturing a liquid crystal display device, comprising connecting the output terminals of