JP2002341321A - Liquid crystal display panel and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure conduction between electrodes by preventing application of a conductive paint from shifting in the position and uniformizing the application state of the paint in a pair of electrode substrates of a liquid crystal display panel. SOLUTION: Out of a pair of the electrode substrate 1a, 1b each having a transparent electrode, the electrode substrate 1b is formed with a circular recess 9 on a position of application of the conductive paint 6 conducting between the transparent electrodes together. The conductive paint is applied to the circular recess 9 and at the same time a pair of the substrates are opposed and stuck to each other via a sealing part 4 and a spherical spacer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display panel and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, liquid crystal display panels have been rapidly increasing in size and definition as displays for notebook computers, OA, and workstations. Therefore, there is an urgent need to establish a manufacturing method for mass production of large liquid crystal panels and stabilization of quality.

Here, a conventional method of manufacturing a liquid crystal display panel will be described with reference to FIGS. An electrode section 2;
A thermosetting adhesive in which an alignment film is formed on an electrode side of an electrode substrate 1a having a surplus portion 5 outside the electrode portion 2 and an alignment process is performed, and then an opening 3 serving as a liquid crystal injection port is partially provided. And a seal portion 4 composed of a rod-shaped spacer are formed by dispenser application.

Next, the electrode substrate 1a or the electrode substrate 1
After the spherical spacer 8 is formed on the other electrode substrate 1b to be superimposed on a, a conductive paint 6 is applied by a dispenser, and the electrode substrate 1a and the other electrode substrate 1b are superposed, positioned and attached.

[0005] After completion of the positioning and bonding, the sealant is pressed and heated, the extra length 5 is cut off in the cutting line 7, and the liquid crystal is injected.

The conductive paint 6 used here is gold,
A mixture of a conductive fine powder made of a simple substance such as silver, nickel, graphite or a mixture thereof and a high boiling organic solvent such as a phenolic resin or butyl carbitol acetate is used.

[0007]

However, in the above-mentioned conventional manufacturing method, the conductive paint has a high volatility, and the viscosity increases due to a variation in the conductive paint manufacturing conditions and the standby time of the substrate, and the shape after application is low. It may not be stable or may vary in size. For this reason, there is a case where conduction between the electrodes of the pair of substrates cannot be performed, or the applied amount is larger than a predetermined amount, and the substrate is protruded from the panel, resulting in a failure.

[0008]

In order to solve the above-mentioned problems, a liquid crystal display panel according to the present invention has a configuration in which a circular concave portion is formed at a position where a conductive paint is applied on a substrate. According to this configuration, even if there is a variation in the standby time or a change in viscosity, the conductive paint can be stably applied to the regular position, and a liquid crystal display panel with less variation in shape can be manufactured.

Further, since the variation is reduced, a liquid crystal panel having a narrower frame can be designed.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a main part of a liquid crystal display panel according to an embodiment of the present invention. Reference numerals 1a and 1b denote electrode substrates on which transparent electrodes are formed, which comprises a color filter substrate and a TFT element substrate. . Reference numeral 4 denotes a seal portion, 6 denotes a conductive paint for electrically connecting the electrodes of the pair of electrode substrates to each other, 8 denotes a spherical spacer, and 9 denotes a position where the conductive paint 6 is applied on the substrate (here, the electrode substrate 1b) in advance. It is a circular recess formed.
The plan view of the electrode substrate is the same as FIG.

Next, the manufacturing method will be described. Among the pair of electrode substrates, for example, a conductive paint 6 is applied to a TFT element substrate (electrode substrate 1b), and a seal portion 4 made of a thermosetting adhesive and a rod-shaped spacer is applied to a color filter substrate (electrode substrate 1a) with a dispenser. The color filter substrate includes a display portion necessary for a liquid crystal panel and a surplus portion necessary for transport during film formation or the like. At the application position of the substrate on which the conductive paint 6 is applied, a circular concave portion 9 which has been etched in advance with a chemical such as hydrofluoric acid is formed. The conductive paint 6 is applied to the circular recess 9.

Next, after the spherical spacers 8 are formed on one of the substrates, the pair of substrates is taken into an alignment machine and bonded together, pressurized to separate the extra length, and the process proceeds to a later step such as liquid crystal injection.

The circular recess 9 has a radius r,
When the depth is d, 0.1 mm ≦ r ≦ 1.0 mm,
It can be formed in the range of 0.1 μm ≦ d ≦ 10 μm.

By employing such a manufacturing method, the conductive paint 6 can be applied to a regular position with high accuracy, and a liquid crystal panel with small variations in shape and size can be manufactured.

Further, by adopting such a configuration, in the experiment, the dispersion of the conductive paint application diameter after the completion of the liquid crystal panel was stabilized from ± 0.5 mm in the past to ± 0.1 mm.

[0016]

As described above, according to the present invention,
Among the pair of substrates each having a transparent electrode, a circular recess is provided at a coating position of a substrate for applying a conductive paint for conducting the transparent electrodes to each other, the conductive paint is applied to the circular recess, and the pair of substrates are sealed with a sealing material. By opposing and sticking through the spacer, the variation in the diameter of the conductive paint applied is stabilized, the display quality of the liquid crystal display panel is stabilized, and the narrow frame design can be facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a main part of a liquid crystal display panel according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a main part of a liquid crystal display panel in a conventional example.

FIG. 3 is a plan view of an electrode substrate according to an embodiment of the present invention and a conventional example.

[Explanation of symbols]

 1a, 1b Electrode substrate 2 Electrode part 3 Opening part 4 Seal part 5 Extra length part 6 Conductive paint 7 Cutting line 8 Spherical spacer 9 Circular recess

Claims (6)

[Claims] 1. A pair of substrates each having a transparent electrode are opposed and adhered to each other with a sealant and a spacer interposed therebetween, and a conductive paint is provided for electrically connecting the transparent electrodes of the pair of substrates to each other. A liquid crystal display panel, wherein a circular concave portion is provided at a position where the conductive paint is applied on the substrate. 2. The radius r of the circular recess is 0.1 mm ≦ r ≦
2. The liquid crystal display panel according to claim 1, wherein the thickness is 1.0 mm. 3. The depth d of the circular recess is 0.1 μm ≦ d ≦
2. The liquid crystal display panel according to claim 1, wherein the thickness is 10 [mu] m. 4. A pair of substrates each having a transparent electrode, a circular concave portion is formed at a coating position of a substrate on which a conductive paint for applying a conductive paint between the transparent electrodes is applied, and a conductive paint is applied to the circular concave portion. A method for manufacturing a liquid crystal display panel, wherein the pair of substrates are opposed to and adhered to each other via a sealing material and a spacer. 5. The method according to claim 1, wherein the radius r of the circular recess is 0.1 mm ≦ r ≦
The method for manufacturing a liquid crystal display panel according to claim 4, wherein the thickness is 1.0 mm. 6. The depth d of the circular concave portion is set to 0.1 μm ≦ d ≦
The method for manufacturing a liquid crystal display panel according to claim 4, wherein the thickness is set to 10 µm.