JPH03287227A - color filter substrate - Google Patents

Abstract

PURPOSE:To prevent the peeling and disconnecting of transparent electrodes from a smooth layer resin during washing or resting in moisture by providing the smooth layer formed by mixing a transparent UV curing resin having an alicyclic dicyclopentenyl structure as basic skeleton and a UV curing resin consisting of monofunctional acrylate and multifunctional acrylate. CONSTITUTION:This substrate has a colored layer 2 on a transparent substrate 1 and has the smooth layer 3a formed by mixing the transparent UV curing resin having the alicyclic dicyclopentenyl structure as the basic skeleton and the UV curing resin consisting of the monofunctional acrylate and multifunctional acrylate on this colored layer 2. The transparent electrodes 4 having prescribed patterns are provided on the smooth layer 3a. Namely, the water absorption quantity of the smooth layer resin during washing or resting in moisture is suppressed by providing the smooth layer 3a having the alicyclic dicyclopentenyl structure as the basic skeleton, by which the swelling is prevented and the degradation in the adhesiveness between the transparent electrodes 4 and the smooth layer resin is obviated. The peeling and disconnecting of the transparent electrodes 4 from the smooth layer resin are prevented in this way and the color filter subpast formed by using the rapidly usable transparent UV curing resin for the smooth layer 3a is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color filter substrate used in a liquid crystal display element.

BACKGROUND OF THE INVENTION Liquid crystal display devices are widely used in both consumer and industrial applications due to their characteristics such as thinness, lightness, low voltage drive, and low power consumption. Furthermore, in recent years, as personal computers have become more popular as laptops, color liquid crystal displays are beginning to be put into practical use.

A conventional color filter substrate used in a color liquid crystal display will be explained below.

FIGS. 5(a), 5(b), and 5(C) illustrate the manufacturing process of a conventional color filter substrate. A colored layer 2 consisting of a plurality of colors R, G, and B is formed on a transparent substrate 1 (FIG. 5(a)). The colored layer 2 is formed by printing, dyeing, electrodeposition, pigment photolithography, or the like. Next, a smoothing layer 3b is formed to smooth out the unevenness caused by the colored layer 2 (FIG. 5(b)).

Ultraviolet curing or thermosetting organic transparent resins are used for the smoothing layer 3, and ultraviolet curing types such as ester types have excellent productivity and surface smoothness, but are inferior in moisture resistance. The thermosetting type has the opposite characteristics. Finally, a transparent electrode 4 having a predetermined pattern is formed on the smooth layer 3 (FIG. 5(C)).

Problems to be Solved by the Invention However, in conventional color filter substrates in which an ultraviolet curing transparent resin is used for the smooth layer 3, the moisture resistance of the smooth layer resin is often insufficient.

For this reason, the resin swells during the process of washing or leaving it in hot water, resulting in a decrease in the adhesion between the transparent electrode 4 and the resin, and in extreme cases, the problem is that the transparent electrode 4 may peel off from the resin or become disconnected. Ta.

The present invention solves the above problems, and aims to provide a color filter in which the transparent electrode does not peel off from the smooth layer resin or break when washed or left in hot water.

Means for Solving the Problems In order to achieve the above objects, the present invention has a plurality of colored layers on a transparent substrate, and on this colored layer there is provided an ultraviolet curing film having an alicyclic synchropentenyl structure as a basic skeleton. It is characterized by comprising a smooth layer made of a mixture of a transparent resin and an ultraviolet curing resin made of monofunctional acrylate or polyfunctional acrylate, and further comprising a transparent electrode having a predetermined pattern provided on the smooth layer. It is something.

According to the present invention, an ultraviolet curable transparent resin having an alicyclic synchropentenyl structure as its basic skeleton, a monofunctional acrylate,
By having a smooth layer mixed with an ultraviolet curable resin made of polyfunctional acrylate, the amount of water absorbed by the smooth layer resin when washed or left in hot water is suppressed, preventing swelling and ensuring close contact between the transparent electrode and the smooth layer resin. The quality does not decrease. Therefore, peeling and disconnection of the transparent electrode from the smooth layer resin can be prevented, and a color filter substrate can be realized in which the smooth layer uses an ultraviolet curable transparent resin that can be cured quickly.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a color filter substrate in an embodiment of the present invention. 1 is a transparent substrate, 2 is a colored layer, 3a is a smooth layer, and 4 is a transparent electrode. The tank bottom of the color filter substrate is completely the same as before, but the resin forming the smooth layer 3a is a UV-curable transparent resin 70 whose basic skeleton is an alicyclic synchropentenyl structure instead of the conventional general UV-curable transparent resin. -1%, neopentyl glycol diacrylate, 25 nt%, and tetrahydrofurfuryl acrylate, 511 t%.

FIG. 2 is a graph showing the amount of water absorbed by a mixture of a conventional color filter substrate and a smooth layer resin according to this embodiment. By using the smooth layer resin of this example, the water absorption amount is reduced to 1/4 or less of the conventional amount, and swelling is suppressed.

FIG. 3 is a graph showing the results of a coexistence test of transparent electrodes 4 on a conventional color filter substrate and a smooth layer according to this embodiment. In this way, even with the same configuration, the frequency of peeling and disconnection of the transparent electrode 4 is drastically reduced due to the difference in resin.

Table 1 shows the wettability, adhesion, and moisture resistance to the transparent substrate 1 and colored layer 2 depending on the UV curing resin.

(The following is a blank space) Table 1 Some ultraviolet curable resins having an alicyclic synchropentenyl structure as a basic skeleton have excellent moisture resistance, but have problems in wettability and adhesiveness. However, in this example, wettability and adhesiveness are sufficiently satisfied, and moisture resistance is also satisfied.゛As described above, according to this embodiment,
The basic skeleton of the ultraviolet curable transparent resin used for the smooth layer 3a is an ultraviolet curable resin blended with 70 wt% alicyclic synchropentenyl structure, 25 wt% neopentyl glycol diacrylate, and 511 t% tetrahydrofurfuryl acrylate, thereby increasing the water absorption of the resin. suppresses swelling and prevents swelling.
It is possible to prevent the transparent electrode 4 from peeling off from the resin and breaking when left in hot water. In addition, it is possible to prevent a decrease in wettability and adhesion due to improved moisture resistance, so by taking advantage of the fast curing properties of ultraviolet curable resin, it is possible to realize a color filter substrate with high productivity and high smoothness. I can do it.

FIG. 4 is a cross-sectional view schematically showing the structure of a color liquid crystal display device using the color filter substrate of this example.

The transparent substrate 9 is coated with a transparent electrode 8 and an alignment film 7 made of polyimide or the like in this order. colored layer 2
A transparent substrate 1 on which a smooth layer 3a and a transparent electrode 4 are formed is a color filter substrate according to the present invention, and an alignment film 5 is further formed thereon. These transparent substrates 1 and 9 are adhered to each other with a spacer 10 interposed therebetween, with a sealing resin 6 provided around at least one of the transparent substrates to maintain a constant gap. A liquid crystal 11 is enclosed. Further, a polarized light Fi 12.13 is provided on the outer surface of the transparent substrate 1.9, and a polarized light Fi 12.13 is provided through the connection terminal 15.
Driven by SI. Note that a light source 14 is provided as a backlight.

Table 2 shows the reliability test results of the color liquid crystal display device at 60'C90%. By using the color filter substrate according to this example, a highly reliable color liquid crystal display device that does not cause peeling of transparent electrodes or disconnection even when left in hot water can be obtained.

In this example, neopentyl glycol diacrylate was described as a polyfunctional acrylate, but any material with relatively low viscosity (200 cps or less) and high crosslinking properties may be used, such as trimethylolpropane Table 2 triacrylate, trimethylolpropane. Trimethacrylate and neopentyl glycol dimethacrylate may also be used. In addition, the blending ratio of polyfunctional acrylate is 10 to 10, considering moisture resistance, wettability, and adhesiveness.
70-t%, tetrahydrofurfuryl acrylate is 3
~10 wt% is desirable.

Effects of the Invention As described above, according to the present invention, the basic skeleton of the ultraviolet curable transparent resin used for the smooth layer is an ultraviolet curable resin that has an alicyclic synchlopentenyl structure as its basic skeleton, a monofunctional acrylate, and a polyfunctional acrylate. By mixing it with a hardened resin, the amount of water absorbed by the resin can be suppressed, preventing peeling and disconnection from the transparent electrode when left in hot water, and also has sufficient wettability for the transparent substrate and colored layer. It can be made to have adhesive properties. As a result, a color filter substrate with high productivity and high surface smoothness that takes advantage of the advantages of ultraviolet curing resin can be realized.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a color filter substrate according to an embodiment of the present invention, Fig. 2 is a comparison diagram of the water absorption amount of the smooth layer resin in the conventional and this embodiment when left in hot water, and Fig. 3 is a cross-sectional view of a color filter substrate in one embodiment of the present invention. A comparison diagram of the frequency of peeling and disconnection of the transparent electrode on the smooth layer resin in the conventional method and this example. FIG. 4 is a cross-sectional view of a color liquid crystal display device using the color filter substrate of this example, and FIG. FIG. 3 is a cross-sectional view showing the manufacturing process of a color filter substrate. 1...Transparent electrode, 2...Colored layer, 3a
... Smooth layer, 4 ... Transparent substrate.

Claims (2)

[Claims] (1) A transparent substrate has a colored layer of multiple colors, and on this colored layer, an ultraviolet curable transparent resin having an alicyclic synchropentenyl structure as its basic skeleton, an ultraviolet curable resin consisting of a monofunctional acrylate, and a polyfunctional acrylate are formed. 1. A color filter substrate comprising: a smooth layer made of a mixture of the above, and further comprising a transparent electrode having a predetermined pattern provided on the smooth layer. (2) The color filter substrate according to claim 1, wherein the monofunctional acrylate is tetrahydrofurfuryl acrylate.