JPH06174915A - Color filter substrate - Google Patents

Abstract

PURPOSE:To provide a color filter substrate capable of preventing the deterioration of contrast and the reduction of color purity. CONSTITUTION:In the color filter substrate 1, a color filter layer 3 is applied on a transparent substrate 2 and a pixel pattern is formed. A black part 4 is arranged between each red, green and blue part of the color filter layer 3 to prevent the mixing of adjacent colors. The black part 4 is formed on the transparent substrate 2 before forming the color filter layer 3. A topcoat layer 5 is formed on the black part 4 formed between the color filter layer 3, and an electrically conductive film 6 is formed on the topcoat layer 5. A gap black part 7 is formed on the electrically conductive film 6 correspond to the black part 4. The gap black part 7 is composed in an equal thickness with the gap between the opposite substrate opposite to the color filter substrate 1 through the gap, and composed narrower than the gap between the electrodes provided on the opposite substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter substrate used for a color liquid crystal display device, for example.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 2, a color filter substrate 1 has a red (R), green (G), and blue (B) color filter layer 3 formed on a transparent substrate 2 by a dyeing method or electrodeposition. Then, a pattern is formed by using a photolithography technique or the like. In addition, the black portion 4 is provided between each red, green and blue of the color filter layer 3.
Are arranged so as to prevent adjacent colors from being mixed with each other, and unnecessary light from a light source (not shown) arranged on the back surface side of the color filter substrate 1 is blocked to improve color purity.

The black portion 4 is formed by photolithography on the transparent substrate 2 before the color filter layer 3 is formed, or the adjacent color filter layers 3 are superposed, and the superposed portion is formed. The black portion 4 is formed by reducing the transmittance of the black part 4.

Then, a black portion 4 is formed between the color filter layers 3, and a top coat layer 5 which is a protective layer for protecting the color filter layer 3 and improving the surface flatness is formed. The color filter substrate 1 is formed by forming the conductive film 6 on the top coat layer 5.

Therefore, when the black portion 4 is formed on the transparent substrate 2 by photolithography before the color filter layer 3 is formed, the thickness of the black portion 4 is smaller than that of the color filter layer 3.

On the contrary, when the black portion 4 is formed by superposing the adjacent color filter layers 3, the black portion 4 is formed.
Is thicker than the color filter layer 3.

However, as described above, the color filter substrate 1 has a difference in thickness between the portion where the color filter layer 3 is formed and the black portion 4, and the surface hardness is also different. Therefore, when a liquid crystal display is constructed by facing a counter substrate (not shown) to the color filter substrate 1 via a gap, the gap between the color filter substrate 1 and the counter substrate is maintained by using particles called spacers. There is.

Further, although the uniformity of the gap varies depending on the display mode of the liquid crystal display used, TN (Twisted Nemati)
c) type 0.5 μm, STN (Super Twisted Nematic)
) Type is about 0.05 μm, and very high precision is required.

However, since there is a difference in thickness between the color filter layer 3 and the black portion 4, in the method of maintaining a gap by using a spacer, a portion close to the black portion 4 and the center of a pixel between the black portions 4 are formed. A gap difference occurs between and, and the difference in gap causes deterioration in characteristics such as a decrease in contrast and a decrease in color purity.

Further, when the spacer is used, since the spacer itself has a property of dispersing light, the light impinging on the spacer is scattered, and the light-permeability and the birefringence are disturbed. Therefore, the contrast is lowered, the color purity is lowered, and the characteristics are lowered.

[0011]

As described above, since there is a step between the color filter layer 3 and the black portion 4 and the hardness of the surface is different, in the method of using the spacer to maintain the gap, the black portion 4 is used. A gap is generated between a portion close to the black portion 4 and the center of the pixel between the black portions 4, resulting in deterioration of characteristics such as deterioration of contrast and color purity.

Further, since the spacer itself has a property of dispersing light, the light application property and the birefringence are disturbed, and similarly, the contrast is deteriorated, the color purity is deteriorated, and the properties are deteriorated. I have a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a color filter substrate capable of preventing a decrease in contrast and a decrease in color purity.

[0014]

The present invention comprises a transparent substrate,
A plurality of electrodes are provided, each of which includes a color filter layer formed on the transparent substrate and forming a pixel, a conductive film formed on the color filter layer, and a black portion formed between the pixels of the color filter. In a color filter substrate that forms a liquid crystal display by facing a counter substrate with a gap therebetween, a gap black portion is provided at a position corresponding to the gap, and the thickness of the gap black portion is different from that of the counter substrate. The gap is substantially the same as the gap, and the width of the black portion in contact with the counter substrate is narrower than the gap between the electrodes of the counter substrate.

[0015]

According to the present invention, since the thickness of the gap black portion is substantially equal to the gap with the counter substrate, the gap can be maintained by the gap black portion without using a spacer, and the portion close to the gap black portion and the pixel can be maintained. There is no difference in the gap between the center and the center, and the contrast and color purity are improved. Further, since the spacer is not required, light is not dispersed by the spacer itself, and it is possible to prevent deterioration of contrast and deterioration of color purity due to disturbance of light application property and birefringence, and characteristics are improved.
Further, by making the width of the gap black portion in contact with the counter substrate narrower than the gap between the electrodes of the counter substrate, it is possible to prevent the gap black portion from being placed on the electrodes and widening the cell gap.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the color filter substrate of the present invention will be described below with reference to the drawings. It should be noted that the portions corresponding to the conventional example shown in FIG.

As shown in FIG. 1, the color filter substrate 1
Is formed by depositing the red (R), green (G), and blue (B) color filter layers 3 on the transparent substrate 2 by a dyeing method, an electrodeposition method or the like, and forming a pattern by using a photolithography technique or the like. is doing. Further, the black portion 4 is arranged between each of red, green and blue constituting the pixels of the color filter layer 3 so as to prevent adjacent colors from being mixed with each other, and is arranged on the back side of the color filter substrate 1. It also serves to block unnecessary light from a light source (not shown) and improve color purity. The black portion 4 is formed on the transparent substrate 2 by photolithography before forming the color filter layer 3.

Then, a black portion 4 is formed between the color filter layers 3, and a top coat layer 5 which is a protective layer for protecting the color filter layer 3 and improving the surface flatness is formed. The color filter substrate 1 is formed by forming the conductive film 6 on the top coat layer 5.

Further, the gap black portion 7 is formed on the conductive film 6.
Corresponding to the black portion 4 above, after applying by vapor deposition, printing, etc., etching by photolithography,
Alternatively, it is formed by a lift-off method. Further, the gap black portion 7 has a thickness similar to that of a counter substrate (not shown) facing the color filter substrate 1 with a gap, and a gap between electrodes provided on the counter substrate (not shown). It is made narrower.

The black portion 4 may be formed by overlapping the adjacent color filter layers 3 and forming the overlapped portion.

Further, the top coat layer 5 between the conductive film 6 and the color filter layer 3 may not be provided.

By using the color filter substrate 1 described above, the gap black portion 7 maintains the gap, so that there is no difference in the gap between the portion close to the black portion 4 and the center of the pixel between the black portions 4. It is possible to prevent the deterioration of characteristics such as the decrease of contrast and the decrease of color purity due to the difference in the gap. Further, since the gap black portion 7 maintains the gap, it is not necessary to provide a spacer located between the color filter substrate 1 and the counter substrate. Therefore, the property of dispersing the light by the spacer itself, scattering, light-giving property, and birefringence Disturbance can be eliminated. Therefore, the contrast,
Color purity is improved and characteristics are improved.

[0023]

According to the color filter substrate of the present invention,
Since the gap can be maintained in the gap black portion, the difference in the gap does not occur between the portion close to the black portion and the portion between the black portions, and the contrast and color purity are improved. In addition, since the gap can be maintained without using a spacer, the spacer is not necessary, and the spacer itself does not disperse the light, so that the contrast is deteriorated due to the disorder of the light application property and the birefringence and the color purity The deterioration can be prevented and the characteristics are improved. Therefore, a color liquid crystal display with high image quality can be manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a color filter substrate of the present invention.

FIG. 2 is a sectional view showing a conventional color filter substrate.

[Explanation of symbols]

 1 Color Filter Substrate 2 Transparent Substrate 3 Color Filter Layer 4 Black Part 6 Conductive Film 7 Gap Black Part

Claims (1)

[Claims] 1. A transparent substrate, a color filter layer formed on the transparent substrate to form a pixel, a conductive film formed on the color filter layer, and formed between each pixel of the color filter. In a color filter substrate having a black portion and facing a counter substrate having a plurality of electrodes with a gap therebetween to form a liquid crystal display, a gap black portion is provided at a position corresponding to the gap, and the gap black portion is provided. And a width of the black portion in contact with the counter substrate is made narrower than a gap between the electrodes of the counter substrate.