JPH03288129A - Color liquid crystal display panel - Google Patents

Abstract

PURPOSE:To obtain the color liquid crystal display panel which is good in operability and reliable in moisture resistance by using resin which set both by ultraviolet irradiation and thermally for a smooth layer. CONSTITUTION:The smooth layer 4 of the ultraviolet-ray setting and thermosetting resin is formed covering a color filter 3 and a transparent electrode 15 is formed in specific pattern on the surface of the smooth layer 4 and processed by orientation to constitute a 1st substrate 1. Liquid crystal 6 is sandwiched between the 1st substrate 1 and a 2nd substrate 2 which has a transparent electrode 5 formed on its surface in specific pattern and also has the electrode processed by orientation and their peripheral parts are sealed with sealing resin 7. Namely, the resin is a ultraviolet-ray setting and thermosetting type, so the operability in the formation of the smooth layer 4 is good and the color liquid crystal display panel which is superior in moisture resistance as compared with a panel which uses ultraviolet-ray setting resin is obtained. Thus, the color liquid crystal display panel which is superior in operability and highly reliable is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal display panel that is used as a thin, lightweight, and low power consumption display, and particularly relates to a color liquid crystal display panel that is attracting attention today. be.

In order to improve the characteristics of a conventional color liquid crystal display panel, it is necessary to form a color filter on a glass substrate and to form a transparent electrode thereon. However, color filters have extremely uneven surfaces, so if left as is, problems such as uneven thickness of the liquid crystal layer and disconnection of transparent electrodes will occur. Therefore,
It is necessary to provide a smooth layer of resin film on the color filter, smooth the surface, and then form transparent electrodes thereon.

Conventionally, ultraviolet curing resins have been mainly used as the resin for this smooth layer. When forming a smooth layer, another substrate with a smooth surface is pressed onto the uncured resin surface.
This is because UV-curable resins must be cured as they are, and in terms of workability, UV-curable resins are much faster and more efficient than thermosetting resins.

Problems to be Solved by the Invention However, although ultraviolet curable resins have excellent workability as mentioned above, they are inferior to thermosetting resins in terms of reliability in terms of moisture resistance, and they also have poor adhesion with sealing resins. It has drawbacks such as poor performance, and there remains a problem with the moisture resistance of liquid crystal panels in particular.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a color liquid crystal display panel with excellent workability and high reliability.

Means for Solving the Problems In order to achieve the above object, the present invention provides a substrate on which a color filter is formed with a smooth layer made of an ultraviolet curable and thermosetting resin so as to cover the color filter. A first substrate is formed by forming a transparent electrode in a predetermined pattern on the surface of the smooth layer and performing an alignment treatment, and forming a transparent electrode in a predetermined pattern on the first substrate and the surface. A liquid crystal is sandwiched between the substrate and a second substrate which has been subjected to alignment treatment, and the peripheral portion is sealed with a sealing resin.

Function: According to this configuration, since the resin is a type that cures using both ultraviolet rays and heat, workability when forming a smooth layer is good, and the color liquid crystal display has superior reliability in terms of moisture resistance compared to the case of ultraviolet curable resin. You get a panel.

Example An embodiment of the present invention will be described below with reference to the drawings.

(Example 1) FIG. 1 is a sectional view showing a color liquid crystal display panel according to an example of the present invention.

Ultraviolet curable polyester acrylate resin A and thermosetting epoxy resin B are applied to the surface of the color filter 3 of the first glass substrate 1 on which the color filter 3 is formed.
: Coat the combined ultraviolet curing and thermosetting resin mixed in step 1 with a roll coater.Next, a glass plate with a smooth surface is pressed onto the resin surface, the resin is cured by ultraviolet rays, and the glass plate is coated. After peeling off, the first glass substrate 1 is further heated to form a smooth layer 4. Furthermore, a transparent electrode 5 is provided on the surface of this smooth layer 4. An alignment film (not shown) is formed on the surfaces of the first glass substrate 1 and the second glass substrate 2 on which the transparent electrodes 5 are formed, and after an alignment treatment is performed, a thermosetting film is applied as a sealing resin 7. The peripheral parts of both glass substrates are pasted together using epoxy resin, and liquid crystal 6 is sealed inside to create a liquid crystal panel.

This color liquid crystal display panel and a conventional color liquid crystal display panel made by providing a smooth layer only with polyester acrylate resin A, which is an ultraviolet curable resin, were tested in a moisture resistance test 40.
When compared at 90% °C, the lifespan of the liquid crystal panel according to this example was improved by about 20%. In this example, polyester acrylate was used as the resin A, but the resin A is not limited thereto, and the mixing ratio also needs to be determined in consideration of workability and the like.

(Example 2) In this example, a color liquid crystal display panel was prepared in the same manner as in Example 1 by using heat and ultraviolet curing resin C having an epoxy group and an acryloyl group in the structural formula for the smooth layer 4. Create. A moisture resistance test showed that the product's lifespan was approximately 30% longer than conventional products.

Effects of the Invention As described above, according to the present invention, since the resin is a type that cures using both ultraviolet rays and heat, it has good workability when forming a smooth layer, and has a moisture-resistant surface compared to the case of an ultraviolet curable resin. A color liquid crystal display panel with excellent reliability can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a color liquid crystal display panel in one embodiment of the present invention. 1.2... Glass substrate, 3... Color filter, 4... Smooth layer, 5... Transparent electrode, 6... Liquid crystal , 7... Seal resin.

Claims (2)

[Claims] (1) A smooth layer made of an ultraviolet curable and thermosetting resin is formed on the substrate on which the color filter is formed so as to cover the color filter, and a transparent electrode in a predetermined pattern is formed on the surface of the smooth layer. At the same time, an alignment treatment is performed to form a first substrate, and a liquid crystal is sandwiched between the first substrate and a second substrate on which transparent electrodes in a predetermined pattern are formed on the surface and an alignment treatment is performed. A color liquid crystal display panel characterized in that the periphery is sealed with a sealing resin. (2) The color liquid crystal display according to claim 1, wherein the resin constituting the smooth layer has a resin whose structural formula includes at least one epoxy group and at least one acryloyl group or methacryloyl group. panel.