JPH0359623A - Manufacture of liquid crystal display panel - Google Patents

Abstract

PURPOSE:To facilitate the manufacture and to obtain sufficient conduction between a transparent electrode and lead-out wiring by applying pressure in a process wherein sealing is carried out with an anisotropic conductive sealing material and removing an insulating coat, and connecting the transparent electrode and lead-out wiring arranged on a 1st and a 2nd substrate electrically to each other. CONSTITUTION:Conductive grains 123 are provided with insulating coats 124 and the 1st substrate 103 and 2nd substrate 107 are set so that surfaces where transparent electrodes 105 and 109 are arranged face each other at a specific distance. Then the pressure is applied in the process wherein the sealing is carried out with the anisotropic conductive sealing material 101 to remove the insulating coats 104, and the transparent electrode 105 arranged on the 1st substrate 103 is connected electrically to the lead-out wires 111 and 113 arranged on the 2nd substrate 107. Consequently, sufficient conduction between the transparent electrodes 105 and lead-out wires 111 and 113 is obtained and the generation of a short circuit is suppressed between the transparent electrodes 105 and 109 of an anisotropic conductive sealing part and between the lead-out wires 111 and 113.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides electrical continuity between a transparent electrode disposed on one substrate and an extraction electrode disposed on the other substrate using an anisotropic conductive sealing material. The present invention relates to a method of manufacturing a liquid crystal display panel.

[Conventional technology and its issues]

Figures 2 (a) and (b) are examples of conventional liquid crystal display panels.
Structures shown in (C) and (C) are known. Figure 2 (
a) is a plan view showing the liquid crystal display panel, FIG. 2 (bl is a sectional view taken along the line B-B in FIG.
c) is a perspective view of the conductive material pattern. This liquid crystal display panel includes a first substrate 201 provided with a transparent electrode 211,
The IC chip 205 is mounted only on one of the second substrates 203 on which the transparent electrodes 216 are disposed. A transparent electrode 216 on the second substrate 206 is connected to the IC chip 205 by a lead wire 207. On the other hand, the transparent electrode 211 on the first substrate 201 connects to the lead wiring 209 on the second substrate 206 via a conductive material 217.
and is connected to the IC chip 205.

This liquid crystal display panel has a first substrate 201 and a second substrate 203 facing each other with transparent electrodes 211 and 213 disposed thereon, separated by a predetermined distance, and the periphery thereof is sealed with a sealant 215. A liquid crystal (
(not shown) is enclosed. The transparent electrode 211 on the first substrate 201 is connected to the second substrate 206 via a conductive material 217.
It is electrically connected to the upper lead wiring 209.

A perspective view of the pattern of the conductive material 217 is shown in FIG. 2(C). Each conductive material 217 is a transparent electrode 2 shown in FIG. 2(b).
11 or each lead-out wiring 209 is placed in a partitioned sealing material 215 to prevent short circuits between adjacent conductive materials 217. Here, a sealing material 215 generally formed by screen printing is used for the conductive material 2170 partition.

A liquid crystal display panel having such a structure requires a step of disposing the conductive material 217 and a step of disposing the sealing material 215 in the manufacturing process, and is not easy to manufacture.

Furthermore, in recent years, there has been a demand for high-density display, and as a result, the nodules of the conductive material 217 have also become finer. However, in the liquid crystal display panel having the above structure, each conductive material 217 must be partitioned,
Furthermore, high accuracy is required due to the alignment between the conductive material 217 and the sealing material 215, etc., making it difficult to manufacture using conventional screen printing or the like.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a method for manufacturing a liquid crystal display panel that is easy to manufacture and provides sufficient conduction between transparent electrodes and lead wiring.

[Means to solve the problem]

In order to achieve the above object, the liquid crystal display panel of the present invention is manufactured by the method described below.

A first substrate having a plurality of transparent electrodes, a second substrate having a plurality of transparent electrodes, an IC chip, and a plurality of lead wires connected to the IC chip; An anisotropic conductive seal in which a liquid crystal is sealed between a substrate and a second substrate, and conductive particles are mixed in a sealing material that connects the transparent electrode of the first substrate and the lead wiring of the second substrate. In the method for manufacturing a liquid crystal display panel comprising a first substrate and a second substrate, the conductive particles are coated with an insulating coating in advance, and
The transparent electrodes arranged on the first substrate and the first substrate are placed facing each other at a predetermined distance apart from each other on the surface on which the transparent electrodes are arranged, and in the process of sealing with an anisotropic conductive sealing material, the pressure is removed and the insulating coat is removed. It is possible to provide a liquid crystal display panel characterized in that the lead wiring arranged on the second substrate is electrically conductive, and the manufacturing method is easy and sufficient electrical conductivity can be obtained between the transparent electrode and the lead wiring.

〔Example〕

Hereinafter, the method for manufacturing a liquid crystal display panel of the present invention will be explained based on Examples. FIG. 1(a) is a plan view showing the liquid crystal display panel of the present invention, and FIG. 1(b) is a plan view showing the A of FIG. 1(a).
It is a sectional view showing a -A cross section. A transparent electrode 105 is provided on the first substrate 103, and a transparent electrode 109 and lead wires 111 and 113 are provided on the second substrate 107. IC chip 115 is mounted on second substrate 107.

The first substrate 103 and the second substrate 107 are transparent electrodes 10
5 and 109 facing each other at a predetermined distance, and the periphery thereof is sealed with an anisotropic conductive sealing material 101. A transparent electrode 109 on the second substrate 107 is connected to an IC chip 115 by a lead wire 113.

On the other hand, the transparent electrode 105 on the first substrate 103 is electrically connected to the lead wiring 111 via the anisotropic conductive sealing material 101.
It is connected to chip 115.

The anisotropic conductive sealing material 101 is composed of a sealing material 121 and conductive grains 123 whose surfaces are coated with an insulating coating 124, and is pressurized during sealing to make it transparent'f! The insulating core 1-124 on the surface in contact with the L pole 105 and the lead wire 111 is removed to provide electrical continuity between the transparent electrode 105 and the lead wire 111.

The anisotropic conductive sealing material 101 constituting the liquid crystal display panel of the present invention exhibits conductivity in the thickness direction and does not exhibit conductivity in the lateral direction.

111, and the glass beads, plastic beads, etc. are made of Ni%Au, Al.

One or more selected from Ag are used. Further, as the insulating coating material 124, epoxy resin, acrylic resin, etc. are used. Seal material 1
As 21, thermosetting resin, ultraviolet curing resin, etc. are used.

The ratio of conductive particles to the sealing material is 1% to 5% by weight.
is preferred.

A method for manufacturing the above liquid crystal display panel will be described below. Conductive particles 12
As the conductive particles 123K, glass beads having a particle size of 6 microns and plated with KNi were used as the conductive particles 123 (epoxy resin was used as the edge coating 124). Conductive particles 1 made of an insulating coat 124 applied to a sealing material 121 made of epoxy adhesive
The anisotropic conductive sealing material 101 was prepared by mixing 3% by weight of 26 with roll kneading. Transparent electrode 109 and lead wiring 11
1. The anisotropic conductive sealing material 101 is placed at a predetermined position on the second substrate 107 on which the transparent electrode 10 is placed by screen printing, and after prebaking at 100° C. for 10 minutes, the transparent electrode 10
The first substrate 103 on which No. 5 is disposed is bonded to a predetermined position. The first substrate 103 and the second substrate 107 are bonded together, and the anisotropic conductive sealing material is baked and hardened while pressing the two substrates in the direction of arrow 125 using air pressure. It was packed in a pressing jig and heated at 150℃ while applying a pressure of 1kg/cnl to the two substrates.
The liquid crystal display panel of the present invention can be manufactured by baking and curing for 30 minutes.

Here, the behavior of the conductive particles 123 coated with the insulating coat 124 during the firing and hardening process will be described. The insulating coat 124 used here is made of epoxy resin and softens at 130°C. 1 kg/c! When the temperature reaches 130° C. after being fired under the pressure of
a transparent electrode 105 disposed on the second substrate 10;
Pressure concentration occurs on the surface in contact with the lead wire 111 disposed at 7, the insulating coat 124 in this pressure concentrated area is removed, the surface of the conductive grain 1260 is exposed, and the electrical connection between the transparent electrode 105 and the lead wire 111 is established. It becomes possible. then 15
By firing at 0° C. while applying pressure, the sealing material 121 and the insulating coat 124 are cured, thereby stabilizing the electrical connection.

The reason why the insulating coat 124 was applied here is that several conductive particles 123 are connected in a chain shape, causing lateral electrical conduction and preventing short circuits at the anisotropic conductive seal portion between the transparent electrodes 105. This is because it can be caused.

In the liquid crystal display panel, the connection at the anisotropic conductive seal portion was sufficient, and there was no short circuit between the transparent electrodes 105 and the lead wires 111.

〔Effect of the invention〕

As explained above, by sealing the liquid crystal display panel with an anisotropic conductive sealing material mixed with conductive particles that have been previously coated with an insulation coating, sufficient electrical conductivity between the transparent electrode and the lead wiring can be achieved. It is also possible to suppress the occurrence of short-circuit defects between the transparent electrodes of the anisotropic conductive seal portion and between the lead wires.

The liquid crystal display panel of the present invention can be manufactured by applying conventional manufacturing methods, and in particular, since the anisotropic conductive sealing material has the functions of a sealing member and a conductive member, two conventional steps of disposing a conductive member and a sealing member are required. This can be achieved by the first step of disposing an anisotropic conductive sealing material.

Regarding a high-density display liquid crystal display panel with a finer pitch of transparent electrodes, the liquid crystal display panel of the present invention can be manufactured by a conventional simple manufacturing method with a small number of steps, and has sufficient electrical conductivity between the transparent electrodes and the lead wiring. Furthermore, it is possible to suppress short-circuit defects between the transparent electrodes and the lead wiring.

Further, the liquid crystal display panel of the present invention is easy to manufacture because the IC chip mounting process only needs to be done on one substrate. Furthermore,
In the case of the liquid crystal display panel of the present invention, the substrate on which no IC chip is mounted can be made thinner, and when applied to a reflective liquid crystal display panel, a liquid crystal display panel with further improved appearance can be obtained.

[Brief explanation of drawings]

1(a) and 1(b) show a method for manufacturing a liquid crystal display panel according to an embodiment of the present invention, FIG. 1(a) is a plan view, and FIG. 1(b) is a plan view of FIG. 1(a). A cross-sectional view taken along A-A in
Figures 2(a), (b), and (C) show conventional liquid crystal display panels, with Figure 2(a) being a plan view and Figure 2(b) being a top view.
) is a sectional view taken along the BB cross section in Figure 2(a),
Figure (C) is a perspective view showing the conductive material pattern. 101...Anisotropic conductive sealing material, 105.10
9...Transparent electrode, 111.113...
Output wiring, 121... Sealing material, 123... Conductive grains, 124... Insulating coat. Figure 1 (G) 15 13 15 (b) Second cause (ON05 07 05 01 (b) Second cause (C) 17

Claims (1)

[Claims] A first substrate having a plurality of transparent electrodes, a second substrate having a plurality of transparent electrodes, an IC chip, and a plurality of lead wirings connected to the IC chip; An anisotropic device in which a liquid crystal is sealed between a substrate and a second substrate, and conductive particles are mixed in a sealing material that connects one transparent electrode of the first substrate and an extraction wiring of the second substrate. In a method for manufacturing a liquid crystal display panel equipped with a conductive sealing material,
An insulating coat is applied to the conductive particles in advance, and the first substrate and the second substrate are opposed to each other with a predetermined distance apart from each other on the surfaces on which transparent electrodes are disposed, and sealed with the anisotropic conductive sealing material. In the process, pressure is applied to remove the insulating coat and remove the first layer.
A method for manufacturing a liquid crystal display panel, characterized in that a transparent electrode provided on the second substrate is electrically connected to a lead wire provided on the second substrate.