JPH10148823A - Color liquid crystal display device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent peeling of a color resin layer from an adhesion interface when a color filter substrate is cut and to decrease cutting failures by subjecting the surface of a plastic film to corona discharge treatment in the production process of a color filter by forming a color resin layer on the plastic film. SOLUTION: In a pair of upper and lower substrates 1, 6 which constitute a liquid crystal display panel, the one substrate 6 is a plastic film substrate 6 produced by subjecting a plastic film 2 to corona discharge treatment and forming a color resin layer 3 on the film 2. By subjecting the surface of the plastic film 2 to corona discharge treatment, wettability (polarity and hydrophilicity) of the plastic film 2 surface is improved, which increases the adhesion strength on the interface between the plastic film 2 and the color resin layer 3. Thereby, failures during cutting the substrate is prevented, and a color liquid crystal display device having a stable color filter substrate structure can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device having a color filter substrate in which a colored resin layer is formed on a plastic film, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a color liquid crystal display device as a display for a portable terminal has been developed. A color liquid crystal display device has a structure in which a liquid crystal layer having dielectric anisotropy is sandwiched between a pair of substrates having a colored resin layer formed on at least one substrate. In recent years, transparent plastic films have been used for substrates.

FIG. 1 is a cross-sectional view showing the structure of the above-mentioned conventional color liquid crystal display device. To explain in accordance with the manufacturing process, a pair of substrates facing each other, a counter substrate 1 and a colored resin The color filter substrate 6 is formed by sequentially forming the layer 3 and further superimposing the smoothing layer 4 and the transparent electrode film 5 thereon, and forming the transparent electrode film 7 on the opposite substrate 1 and the transparent electrode film 6 on the color filter substrate 6. Organic alignment films 8 and 9 are formed on the electrode film 5 respectively, and after rubbing, spacers 10 are uniformly arranged between the rubbed organic alignment films 8 and 9 to form a pair of substrates, the opposing substrate 1 and the opposing substrate 1. A sealing seal 11 is formed between the color filter substrates 6, and the opposing substrate 1 and the color filter substrate 6 are arranged facing each other and combined. In this state, the counter substrate 1 and the color filter substrate 6
Is cut along a cutting line 12 to remove an ineffective area, and then a liquid crystal layer 13 is sealed between the counter substrate 1 and the color filter substrate 6.

[0004] Reference numerals 14 and 15 denote deflecting plates formed on the outer surfaces of the counter substrate 1 and the color filter substrate 6.

[0005]

However, such a panel of a color liquid crystal display device having a conventional structure has a disadvantage in that when the colored resin layer 3 is directly formed on the plastic film 2 of the color filter substrate 6, the plastic film 2 and There is a tendency that good adhesive strength cannot be obtained at the interface of the colored resin layer 3. Moreover, since the rigidity of the plastic film 2 is low, the gap between the pair of opposing substrates 1 and the color filter substrate 6 may be non-uniform. The resin layer 3 is formed. In this case, when physical damage is applied to the color filter substrate 6 at the time of cutting the non-effective area, the interface between the plastic film 2 and the colored resin layer 3 constituting the color filter substrate 6 is formed. If the adhesive strength is low, the colored resin layer 3 below the sealing seal 11
Was sometimes peeled off at the bonding interface.

The present invention solves such a conventional problem, and makes it difficult to cause the colored resin layer to peel off from the bonding interface due to physical damage at the time of cutting the substrate, thereby reducing defective cutting. It is an object of the present invention to provide a color liquid crystal display device having a structure and a method for manufacturing the same.

[0007]

In order to solve the above-mentioned problems, the present invention provides a method of forming a color filter substrate by forming a colored resin layer on a plastic film, and performing corona discharge treatment on the surface of the plastic film. As a result, the adhesive strength at the interface between the plastic film and the colored resin layer can be increased, and defects at the time of cutting the substrate can be eliminated, and a color liquid crystal display device having a stable color filter substrate structure can be obtained.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, one of a pair of upper and lower substrates constituting a liquid crystal display panel is colored on a plastic film subjected to a corona discharge treatment. This is a color liquid crystal display device, which is a color filter substrate with a resin layer formed. Since the plastic film surface has been subjected to corona discharge treatment, the plastic film surface has improved wettability (polarization, hydrophilicity), and The adhesive strength at the interface of the colored resin layer increases.

According to a second aspect of the present invention, when forming a color filter substrate which is one of a pair of upper and lower substrates constituting a liquid crystal display panel, a corona discharge treatment is applied to a plastic film. And then
This is a method for manufacturing a color liquid crystal display device in which a colored resin layer is formed on the plastic film. The surface of the plastic film on which the colored resin layer is formed is subjected to corona discharge treatment so that the wettability (polarization, hydrophilicity) of the plastic film surface is improved. And the adhesive strength at the interface between the plastic film and the colored resin layer is increased.

Hereinafter, embodiments of a structure of a color liquid crystal display device of the present invention and a method of manufacturing the same will be described with reference to the drawings.

(Embodiment) The structure of a color liquid crystal display device according to an embodiment of the present invention is identical in appearance to the structure shown in FIG. 1 which is a cross-sectional view of a conventional color liquid crystal display device. The cross-sectional view of the color liquid crystal display device according to the present embodiment and the description thereof will be omitted. However, the difference between the conventional color liquid crystal display device and the color liquid crystal display device according to the present embodiment cannot be shown in the drawings, but when forming the color filter substrate 6, the surface energy of 30 dyn /
is that the corona discharge treatment is performed at a density of not more than ² cm ² ,

[0012]

Embedded image

The wettability (polarization, hydrophilicity) is improved due to the occurrence of the like, and the adhesive strength at the interface between the plastic film 2 and the colored resin layer 3 is increased. Since the adhesive strength at the interface between the plastic film 2 and the colored resin layer 3 is increased, the cutting failure that has occurred with a probability of 5% or more in the conventional color liquid crystal display device is completely eliminated.

[0014]

As described above, according to the color liquid crystal display device of the present invention and the method of manufacturing the same, the adhesive strength at the interface between the plastic film and the colored resin layer can be increased.
It is possible to obtain a color liquid crystal display device having a stable color filter substrate structure by eliminating defects at the time of substrate cutting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a color liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Counter substrate 2 Plastic film 3 Colored resin layer 4 Smooth layer 5, 7 Transparent electrode film 6 Color filter substrate 8, 9 Organic alignment film 10 Spacer 11 Sealing seal 12 Cutting line 13 Liquid crystal layer 14, 15 Deflection plate

Claims (2)

[Claims] 1. A color liquid crystal display device in which one of a pair of upper and lower substrates constituting a liquid crystal display panel is a color filter substrate in which a colored resin layer is formed on a plastic film subjected to a corona discharge treatment. . 2. A method for forming a color filter substrate, which is one of a pair of upper and lower substrates constituting a liquid crystal display panel, is to perform a corona discharge treatment on a plastic film, and then, on the plastic film. A method for manufacturing a color liquid crystal display device in which a colored resin layer is formed.