JPH06324318A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To simplify the forming method of an electrodeposition color filter, to decrease the cost of the electrodeposition color filter, and to decrease the production cost of a color liquid crystal display device. CONSTITUTION:The color liquid crystal display device uses an electrodeposition color filter. The electrodeposition color filter of this device is formed by simplifying the shape of transparent electrodes (6a, 6b, 6c) where an ink compsn. is to be electrically deposited and forming black films 7a, 7b, 7c, 7d without using a photolithgraphic process. Thus, the cost for the electrodeposition color filter is decreased and the cost for the color liquid crystal display device is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor (hereinafter referred to as a TFT: Thin Film Transistor).
tor) as a switching element to drive a liquid crystal.

[0002]

2. Description of the Related Art Conventionally, a color filter formed by a photolithography method has been mainly used as a color filter used in a color liquid crystal display device. However, from the viewpoint of cost reduction of the liquid crystal display device, the color filter is the material having the highest cost ratio among the members constituting the liquid crystal display device, and the cost reduction is required. In order to reduce the cost, there is an electrodeposition color filter that can be manufactured by a simpler manufacturing method than the photolithography method. The method for producing this electrodeposition color filter will be described below.

FIG. 3 is a plan view showing TFTs arranged in a matrix on a transparent substrate. In the figure, gate electrode lines 1a, 1b made of metal and TFTs 2a, 2b, 2c formed in contact with the gate electrode lines are formed, and source electrode lines 3a, 3b, 3c provided in contact with a part thereof are formed.
3d, drain electrodes 4a, 4b, 4c are formed, and the pixel electrodes 5a, 5b, 5c are connected to the drain electrode.

A liquid crystal layer (not shown) is sandwiched between the transparent substrate shown in FIG. 3 and the electrodeposition color filter shown in FIG. 4 to form a color liquid crystal display device. Figure 5
FIG. 6 is a plan view showing an arrangement of an electrodeposition color filter and a transparent substrate on which a TFT is formed.

As shown in the figure, an ink composition (for example, red (R), green (G), blue (B)) of a plurality of hues in which a resin and a dye are mixed on a first substrate is striped. Island-shaped electrodeposited portions 6a, 6b formed by a photolithography process using a positive resist on the transparent electrodes formed in a strip shape.
6c, that is, electrodeposition is formed on the upper portion facing the pixel electrodes 5a, 5b, 5c formed on one main surface of the second substrate. Further, after removing the positive resist, the black film 7 is formed on the first substrate in a matrix shape in the vertical and horizontal directions in a region other than the occupied region where the ink composition is electrodeposited. Here, the black film includes a film made of metal, a film made of a resin and a black pigment, and a film made of a resin and a black pigment.

[0006]

This electrodeposition color filter is a known technique and is being put to practical use in order to reduce the cost of the color filter. However, a black film is formed in a matrix shape in the vertical and horizontal directions. To form a black film in the lateral direction, a photolithography process using a positive resist is used to form an island-shaped electrodeposition portion on the transparent electrode, the positive resist is removed, and then a black film is formed. Therefore, there was a problem in productivity and cost.

The present invention relates to a method for forming an electrodeposition color filter in the above-mentioned color liquid crystal display device, in which the shape of a transparent electrode for electrodeposition is simplified and a black film is formed without using a step of photolithography. The cost of the color filter is reduced.

[0008]

In the liquid crystal display device of the present invention, the black film on the first substrate is formed on at least one of the X-direction signal line and the Y-direction signal line on the second substrate. Forming a transparent electrode on the first substrate in a portion outside the occupied area of the black film, which is formed without using a photolithography step in a region facing the upper portion and a region facing the upper portion of the thin film transistor. Is characterized by.

[0009]

With the above structure, in the formation of the electrodeposition color filter, the processing steps can be simplified, the facility cost can be reduced and the mass production can be performed, and the cost of the color filter in the liquid crystal display can be reduced.

[0010]

EXAMPLES An example of the present invention will be described below.
FIG. 1 shows an electrodeposition color filter and a T showing an embodiment of the present invention.
FIG. 3 is a layout view of a substrate on which an FT is formed, and is a first view in the drawing.
Transparent electrodes 6a, 6b, 6c for electrodeposition of ink compositions of plural kinds of hues, for example, red (R), green (G), and blue (B), in which a resin and a dye are mixed on a substrate of , The upper part of the source electrode lines 3a, 3b, 3c, 3d which are the signal line groups in the Y direction among the signal line groups formed in the XY direction matrix on the one main surface on the second substrate and the TFT 2a, Two
b, 2c, a transparent electrode 6a formed on a portion other than the upper portion facing the upper portion and electrodeposited with the ink composition on the first substrate,
The black films 7a, 7 are formed in the areas other than the occupied areas of 6b, 6c.
b, 7c, 7d is an electrodeposition color filter. Although there is a region where the black film cannot cover the lateral electrodes, there is no significant deterioration in performance and reliability, and there is no practical problem.

The electrodeposition color filter of this embodiment is formed by the process flow shown in FIG. The electrodeposition color filter thus formed can be formed without using a process by photolithography as compared with the conventional electrodeposition color filter manufacturing method, and thus the electrodeposition color filter forming process can be simplified and the color liquid crystal display device Cost reduction was achieved.

[0012]

By using the electrodeposition color filter according to the present invention, the electrodeposition color filter manufacturing process can be simplified, and the cost of the color liquid crystal display device can be reduced without noticeable deterioration in performance and reliability. Is possible.

[Brief description of drawings]

FIG. 1 is a layout view of a substrate on which an electrodeposition color filter and a TFT group are formed according to an embodiment of the present invention.

FIG. 2 is a flow chart of a manufacturing process of an electrodeposition color filter according to the embodiment.

FIG. 3 is a plan view of a substrate on which a TFT is formed.

FIG. 4 is a plan view of a conventional electrodeposition color filter.

FIG. 5 is a layout view of a substrate on which a conventional electrodeposition color filter and a TFT group are formed.

[Explanation of symbols]

 2a, 2b, 2c TFTs 6a, 6b, 6c Transparent electrodes 7a, 7b, 7c, 7d Black film

Claims (3)

[Claims] 1. An ink composition having a plurality of hues obtained by mixing a resin and a dye or a resin and a pigment is electrodeposited on a transparent electrode group formed on a transparent substrate, and the ink composition is electrodeposited. A first substrate having a black film formed outside the exposed area, a signal line group formed in an XY matrix on a transparent substrate, and a thin film transistor group electrically connected to the signal line group are formed. A liquid crystal display device in which a liquid crystal layer is sandwiched between a second substrate and a black film on the first substrate, and at least a signal line in the X direction and a signal in the Y direction of the second substrate. A liquid crystal display device, characterized in that it is formed in a region of one of the lines facing the upper part and a region of the thin film transistor facing the upper part. 2. The liquid crystal display device according to claim 1, wherein the transparent electrode on the first substrate is formed in a region excluding a region occupied by the black film. 3. The black film material is an ink composition in which a resin and a black pigment are mixed, or an ink composition in which a resin and a black pigment are mixed.
The described liquid crystal display device.