JPH06110046A - Color filter substrate - Google Patents

Abstract

PURPOSE:To provide the color filter substrate improved in production yield. CONSTITUTION:This color filter substrate 1 is formed by successively laminating and disposing color filters 3, a top coat 4 of a polyimide photosensitive resin which is an org. resin and a transparent conductive electrode 5 on a flat planar glass substrate 2 consisting of soda lime glass. A top coat 6 of a polyimide photosensitive resin which is an org. resin is also formed on the rear surface side of the glass substrate 2 in the same manner as for the top coat 4 on the front surface side. After a liquid crystal is sealed in the spacing between the color filter substrate 1 and a counter substrate, the top coat 6 on the rear surface of the glass substrate 2 is peeled by etching with a solvent of hydrochloric acid (HCl). The top coats 4, 6 are the polyimide photosensitive resin and are, therefore, shrunk more drastically by heat than the glass of the glass substrate 2 but since these top coats are formed on both surfaces of the glass substrate 2, the color filter substrate 1 hardly warps.

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 which improves manufacturing yield.

[0002]

2. Description of the Related Art In recent years, color liquid crystal displays have become widespread, and this liquid crystal display has a color filter substrate 1 as shown in FIG. 3, for example. In the color filter substrate 1, a color filter 3, an organic resin top coat 4 and a transparent conductive film electrode 5 are sequentially laminated on a flat glass substrate 2.

Here, the reason why the top coat 4 is formed on the color filter 3 is that the surface of the color filter 3 has large irregularities, and when the transparent conductive film electrode 5 is formed directly on the color filter 3, This is because the transparent conductive film electrode 5 often breaks due to the step of the color filter 3. Therefore, when the color filter 3 is used,
It is essential to smooth the surface of the color filter 3 and prevent disconnection of the transparent conductive film electrode 5.

[0004]

However, in most cases, the top coat 4 is made of an organic resin, and the organic resin is more contracted by heat than the glass of the glass substrate 2. Therefore, the top coat 4 is formed on the glass substrate 2.
When the color filter substrate 1 on which is formed is used for a liquid crystal display, the color filter substrate 1 is warped during the manufacturing process. Due to the warp of the color filter substrate 1, the fixing of the color filter substrate 1 becomes insufficient on the manufacturing machine, and there are problems such as damage of the color filter substrate 1 and troubles of the transport system. There is a problem in that a pattern shift due to a misalignment with a counter substrate (not shown) that faces the filter substrate 1 and the like significantly reduces the manufacturing yield.

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 having an improved manufacturing yield.

[0006]

According to the present invention, a color filter is formed on one surface of a glass substrate, a top coat of an organic resin is formed on the color filter, and a transparent conductive film electrode is formed on the top coat. In the formed color filter substrate, a top coat of an organic resin is formed on the other surface side of the glass substrate.

[0007]

According to the present invention, not only is the organic resin topcoat formed on the color filter on one surface of the glass substrate, but the organic resin topcoat is also formed on the other surface of the glass substrate. Since warping can be prevented, manufacturing by an automatic machine is facilitated, and yield reduction due to misalignment can be prevented.

[0008]

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. The portions corresponding to those of the conventional example shown in FIG.

As shown in FIG. 1, the color filter substrate 1
Is soda lime glass and the size is 360 × 300 ×
On a 0.7 t [mm] flat glass substrate 2, a color filter 3, a top coat 4 of a polyimide-based photosensitive resin which is an organic resin, and a transparent conductive film electrode 5 are sequentially laminated. The reason why the top coat 4 is formed is that when the transparent conductive film electrode 5 is directly formed on the color filter 3, the surface of the color filter 3 has large irregularities, and the transparent conductive film electrode 5 is broken due to the unevenness. This is to prevent this. Further, similarly to the top coat 4 on the front surface side, a top coat 6 of a polyimide photosensitive resin which is an organic resin is formed on the back surface side of the glass substrate 2.

On the other hand, the counter substrate 7 is formed by disposing a transparent conductive film electrode 9 on a glass substrate 8 similar to the glass substrate 2.

When forming a liquid crystal display, as shown in FIG. 2, the color filter substrate 1 and the counter substrate 7 are bonded so as to face each other substantially in parallel via a spacer (not shown), and the color filter substrate 1 is attached. It is formed by injecting liquid crystal 10 into the gap between the substrate and the counter substrate 7.

After the step of enclosing the liquid crystal 10 is completed, the top coat 6 on the back surface of the glass substrate 2 is coated with hydrochloric acid (HC
l) Etch with a solvent such as to remove.

Next, the color filter substrate 1 having the top coat 4 formed on only one side, and the top coats 4 and 6 on both sides.
A liquid crystal display is manufactured using the color filter substrate 1 on which is formed, and each warp before being bonded to the counter substrate 7 and an experimental result of a defective rate due to a misalignment are shown in Tables 1 and 2. Compare.

The glass substrate 2 was soda lime glass and had a size of 360 × 300 × 0.7 t [mm].

In Table 1, the warpage of the color filter substrate 1 having the top coat 4 on only one side and the color filter substrate 1 having the top coat 6 on both sides is compared. The warp is 0.5 or more, while the top coat on both sides 4,
The color filter substrate 1 of No. 6 is as small as 0.3 or less.

Table 2 shows the defective rate due to misalignment, and the color filter substrate 1 of the top coat 4 having only one surface has 10 defects.
%, The color filter substrate 1 of the top coats 4 and 6 on both sides is very small at 3%.

That is, since the top coats 4 and 6 are made of a polyimide type photosensitive resin, they shrink more sharply due to heat than the glass of the glass substrate 2, but since they are formed on both sides of the glass substrate 2, the color filter substrate 1 is formed. Less likely to warp.

[0018]

[Table 1]

[Table 2] Therefore, the top coats 4, 6 are formed on both sides of the glass substrate 2.
Since the warp of the color filter substrate 1 can be prevented by forming the, the manufacturing by the automatic machine becomes easy, and the yield decrease due to the misalignment can be prevented.

[0019]

According to the color filter substrate of the present invention,
By forming not only an organic resin topcoat on the color filter on one surface of the glass substrate but also an organic resin topcoat on the other surface of the glass substrate, warpage can be prevented. Therefore, the manufacturing by the automatic machine becomes easy, and the yield decrease due to the misalignment can be prevented.

[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 cross-sectional view showing a liquid crystal display using the same color filter substrate as above.

FIG. 3 is a cross-sectional view showing a conventional color filter substrate.

[Explanation of symbols]

 1 color filter substrate 2 glass substrate 3 color filter 4,6 top coat 5 transparent conductive film electrode

Claims (1)

[Claims] 1. A color filter substrate in which a color filter is formed on one surface of a glass substrate, a top coat of an organic resin is formed on the color filter, and a transparent conductive film electrode is formed on the top coat. A color filter substrate having an organic resin top coat formed on the other surface of the glass substrate.