JPH04307518A - Color filter substrate for liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the uniform formation of a specified spacing by providing dummy patterns in the excess parts of a filter substrate disposed with plural pieces of individual color filter pieces and sticking a TFT substrate opposite to this substrate. CONSTITUTION:The dummy patterns 20 are formed in the cruciform parts smaller by one size than the excess parts 11 of the glass substrate 2. The dummy patterns 20 are the same as the surface of the individual color filter pieces 3 and are formed with the same picture elements as the picture elements formed in accordance with a specified arrangement rule. A black matrix encloses the circumferences of this picture elements and the surfaces of the picture elements and the black matrix are coated with a leveling film. Transparent electrodes are provided on the surface of the leveling film, by which this color filter substrate is constituted. The generation of deformation in the color filter substrate and the TFT substrate 15 by the external pressure to pressurize the color filter substrate 1 and the TFT substrate 15 at the time of curing of the sealant 14 is obviated by forming the dummy patterns 20 to the excess parts of the glass 2 in such a manner.

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 for a liquid crystal display device that can be used in a liquid crystal display device.

0002

2. Description of the Related Art In recent years, advances in microfabrication technology and liquid crystal materials have led to the realization of televisions, word processors, and the like using liquid crystal display devices. In particular, liquid crystal display devices have become important because they can be made thinner and lighter than conventional display devices using CRTs. Recently, color liquid crystal display devices have become more and more popular, and color liquid crystal display devices using color filter substrates are attracting attention.

A conventional color filter substrate for a liquid crystal display device will be explained below. FIG. 4 is a plan view of a color filter substrate on which four color filter pieces are arranged, FIG. 5 is a partially enlarged plan view of the color filter substrate, and FIG. 6 is a partial cross-sectional view of the color filter substrate.

As shown in FIG. 4, this color filter substrate 1 has four color filter pieces 3 disposed on a glass substrate 2, and displays formed on the surface of the glass substrate 2 as shown in FIGS. 5 and 6. The picture element (red R5, green G6, blue B7) 4 necessary for
6. A black matrix 8 for preventing a switching element (not shown) provided for each blue B7 from malfunctioning due to light, and a leveling film 9 covering the surfaces of the glass substrate 2, the picture element 4, and the black matrix 8. , and a transparent electrode 10 provided on the surface of this leveling film 9. The portion of the glass substrate 2 excluding the color filter pieces 3 is a +-shaped surplus portion 11, and this surplus portion 11 is divided into four along the dividing line 12 so that the color filter substrate 1 can be divided into four. It is formed.

The color filter substrate 1 formed as described above is then sealed with a TFT substrate 15 using a sealant 14 with a spacer 13 interposed therebetween as shown in FIGS. 7 and 8.
The empty panel 16 is manufactured by pasting the blank panel with the blank panel 16. By interposing the spacer 13 between the color filter substrate 1 and the TFT substrate 15 in this manner, a certain gap 17 is provided.

[0006]

However, as shown in FIG. 8, when forming a certain gap 17 in the empty panel 16, the extra portion 11 is filled with picture elements (red R5, green G6,
Blue B7) 4, black matrix 8, leveling film 9
, since the transparent electrode 10 is not arranged, a gap is created,
When the sealant 14 hardens, the color filter substrate 1 and T
The external pressures P1 and P2 that apply pressure to the FT substrate 15 cause deformation of both substrates 1 and 15 as shown in FIG. For this reason, it becomes impossible to ensure a constant and uniform gap 17 in the empty panel 16. In this way, there is a uniform gap 1 in the empty panel 16.
7 cannot be ensured, the thickness of the liquid crystal display device will vary, resulting in uneven display contrast due to variations within the screen, and the response speed of the liquid crystal will also vary.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a color filter substrate without distortion by forming a constant gap between the color filter substrate and the TFT substrate. .

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of individual color filter pieces for a liquid crystal display device arranged on a glass substrate, and there is a surplus between the individual color filter pieces. A dummy pattern is formed in this surplus portion.

[0009]Furthermore, the present invention provides that the dummy pattern is formed from the same constituent elements as the picture elements, black matrix, leveling film, and transparent electrodes forming the individual color filter pieces, or at least from only the picture elements. There is.

0010

[Function] The present invention provides a dummy pattern having the same thickness or about the same thickness as the individual color filter pieces in the surplus portion of the glass substrate.
It is possible to form a constant gap with the substrate and eliminate distortion.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color filter substrate for a liquid crystal display device according to the present invention will be described below.

FIG. 1 is a perspective view of the color filter substrate and the TFT substrate before they are bonded together, FIG. 2 is a partial sectional view of the color filter substrate, and FIG. 3 is the color filter substrate and the TFT substrate.
FIG. 3 is a cross-sectional view after bonding the substrates together. Note that the same components as in the conventional example are given the same numbers.

Similar to the conventional color filter substrate 1, the color filter substrate 1 has four color filter pieces 3 arranged on a glass substrate 2. Picture elements (red R5, green G6, blue B7) 4 necessary for display are formed on the surface of each color filter piece 3 according to a certain arrangement rule, and a black matrix 8 surrounds the picture elements 4, and the glass substrate 2 , the surfaces of the picture elements 4 and the black matrix 8 are covered with a leveling film 9, and the surface of this leveling film 9 is further covered with a transparent electrode 1.
0 covers.

The present invention differs from the conventional example in that a dummy pattern 20 is formed in a +-shaped portion that is slightly smaller than the surplus portion 11 of the glass substrate 2. This dummy pattern 20 is the same as the surface of the color filter piece 3, and the same picture elements 4 (red R5, green G6, blue B7) 4 formed according to a certain arrangement rule are formed. 4
A black matrix 8 surrounds the picture element 4,
A leveling film 9 covers the surface of the black matrix 8, and a transparent electrode 10 is provided on the surface of the leveling film 9. By forming the dummy pattern 20 on the excess portion of the glass substrate 2 in this way, when the sealant 14 hardens, the color filter substrate 1 and the TFT substrate 15 are deformed by the external pressure that applies the color filter substrate 1 and the TFT substrate 15. It will no longer occur.

The manufacturing procedure of the color filter substrate 1 is to first form a black matrix 8 on a glass substrate 2, then pattern the picture elements (red R5, green G6, blue B7) 4, and then form a leveling film 9, A transparent electrode 10 is formed. At that time, the black matrix 8 and the picture element (red R
5. Green G6, Blue B7) 4. Leveling film 9, Transparent electrode 1
A dummy pattern 20 is formed using the same material and the same color tone, and the color filter substrate 1 of the present invention is completed.

In the above embodiment, the dummy pattern 20 is a black matrix 8, picture elements (red R5, green G6, blue B7).
4. It is formed with a leveling film 9 and a transparent electrode 10,
The dummy pattern 20 of the present invention does not necessarily have to be formed of such constituent elements; for example, the dummy pattern 20 may be formed of only the picture elements 4, or the red R5 and the green G6 of the picture elements 4. , blue B7, or a combination of only two.

Therefore, the black matrix 8, the leveling film 9, and the transparent electrode 10 are not necessarily necessary, and some of these components and the picture elements 4 may be combined.

Further, in the above embodiment, four color filter pieces 3 are formed on the glass substrate 2, but the number of color filter pieces 3 is not limited to four. The number is not limited.

[0019]

[Effects of the Invention] With the above configuration, the present invention forms a dummy pattern in the surplus portion of the color filter substrate on which a plurality of color filter pieces are arranged, and then attaches a TFT substrate facing the dummy pattern. Since it becomes possible to uniformly form a certain gap, it has the effect of contributing to improving the quality of the liquid crystal panel.

Furthermore, since the dummy pattern is formed using the material or color tone used when forming the individual color filter pieces, it has the advantage that it can be manufactured easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a color filter substrate and a TFT substrate of the present invention before being attached.

FIG. 2 is a partial cross-sectional view of a color filter substrate of the present invention.

FIG. 3 is a sectional view of the color filter substrate and TFT substrate of the present invention after being attached.

FIG. 4 is a front view of a conventional color filter substrate.

FIG. 5 is a partially enlarged view of a conventional color filter substrate.

FIG. 6 is a partial cross-sectional view of a conventional color filter substrate.

FIG. 7 is a perspective view of a conventional color filter substrate and a TFT substrate before being attached.

FIG. 8 is a partial cross-sectional view of a conventional color filter substrate and a TFT substrate after they are pasted together.

FIG. 9 is a cross-sectional view of a modified conventional color filter substrate and TFT substrate.

[Explanation of symbols]

1 Color filter board 2 Glass substrate 3 Color filter pieces 4 Picture elements 8 Black Matrix 9 Leveling film 10 Transparent electrode 11 Surplus portion 20 Dummy pattern

Claims (2)

[Claims] 1. A liquid crystal display in which a plurality of color filter pieces for a liquid crystal display device are disposed on a glass substrate, and a surplus portion is provided between each color filter piece, and a dummy pattern is formed in this surplus portion. Color filter substrate for display devices. 2. The dummy pattern according to claim 1, wherein the dummy pattern is formed from the same components as the picture elements, black matrix, leveling film, and transparent electrodes forming the individual color filter pieces, or at least from only the picture elements. Color filter substrate for liquid crystal display devices.