JPH0486703A - Production of color filter - Google Patents

Abstract

PURPOSE:To easily and exactly smooth a surface by forming a conductive film and color matrices on a substrate, then depositing an electrodeposition coating by an electrodeposition method on the conductive film with the conductive film as one of electrodes, thereby packing and smoothing the spaces between the elements of the color matrices with an electrodeposition coating. CONSTITUTION:The conductive black matrices 4 are first formed on the substrate 2 and the color matrices are formed by a dyeing method, etc., between these matrices; thereafter, the electrodeposition coating is deposited by the electrodeposition method. For example, pigments of an anthraquinone system, etc., are used for the electrodeposition coating. The substrate 2 and a counter electrode 8 are immersed into a soln. 6 dispersed with the electrodeposition coating. The electrodeposition coating 10 is deposited in the exposed parts of the black matrices 4 when the electrodeposition is executed with the black matrices 4 as cathode. The spaces between picture element R, G and B are completely packed with the electrodeposition coating 10 by selecting the time, current, etc., for the electrodeposition, by which the surface of the color matrices is smoothed. The color filter having the smooth surface is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention 1] The present invention relates to a method of manufacturing a color filter used for a liquid crystal display or the like, and particularly relates to smoothing the surface of a color filter.

[Prior Art] Methods for manufacturing color filters used in color liquid crystal displays include dyeing methods (Japanese Patent Application Laid-Open No. 60-55゜301);
Pigment dispersion method (JP-A No. 1-152.449, JP-A No. 2-47)
．． 605), printing method (JP-A No. 60-98.482)
However, all of these have the problem of not being able to obtain smooth color filters. Recesses remain between each element of the color filter, and the recesses prevent formation of transparent electrodes on the top of the color filter. These color filters are used in liquid crystal displays, etc., and a transparent electrode such as rTO is usually formed on the top of the color filter for driving the liquid crystal. If the surface of the color filter is uneven, it becomes difficult to form transparent electrodes, and it also causes troubles such as electrode breakage during use.

As a technique for smoothing the surface of a color filter, a method is known in which the color filter after manufacture is treated with evokino resin, etc., and the recesses are filled with the resin (Japanese Patent Laid-Open No. 61-62, 1986).
No. 4). However, even with this method, it is not possible to completely fill the recesses with resin, and unevenness still remains on the filter after treatment.

[Problem of the Invention] An object of the present invention is to provide a new technique for smoothing the surface of a color filter, and to easily and reliably smooth the surface of the color filter.

(Structure 1 of the Invention In this invention, after a conductive film and a color matrix are provided on a substrate, the conductive film is used as one electrode for electrodeposition, and the recesses of the color filter are filled with electrodeposition paint by the electrodeposition method. For the conductive film, a conductive black matrix such as a metal black matrix, an IT○ film, etc. is used.The color matrix is at least one of red (R), green (G), blue (B), etc. It shall have three colors.

In this way, the spaces between the R, G, and B elements are filled with electrodeposition paint, resulting in a smooth color filter. Electrodeposition is performed using a black matrix, an I-layer film, or the like as an electrode, and the electrodeposition paint is not deposited on the surface of the insulating color matrix. As a result, only the spaces between the elements of the color matrix can be filled uniformly and completely.

[Example] Examples are shown in FIGS. 1 and 2. First, a conductive black matrix is formed on a substrate.

This state is shown in FIG. 2(A). In the figure, 2 is a transparent substrate such as glass, and 4 is a conductive black matrix such as a metal black matrix. Next, a color matrix is formed between the matrices of the black matrix 4 by a dyeing method, a pigment dispersion method, an ff1l method, or the like. This state is shown in FIG. 2(B). R is a red pixel, G is a green pixel, B is a blue pixel, and pixels R, G
, B, and the color filter surface is not smooth.

After the color matrix is formed, an electrodeposition paint is deposited by an electrodeposition method. The electrodeposition paint is, for example, black, and is deposited on the top of the blank matrix 4. For the electrodeposition paint, for example, anthraquinone-based, halogenated phthalonanine-based, or phthalonanine-based pigments are used. As shown in FIG. 2C, the electrodeposition is carried out by immersing the substrate 2 and the counter electrode 8 in a solution 6 in which an electrodeposition paint is dispersed, and using the black mud 1 node 4 as a cathode.

The process of electrodeposition is shown in FIG. The electrodeposition paint 10 is deposited on the exposed portion I of the black matrix 4.

Generally, the pixels R, G, and B are insulating, and the electrodeposition paint 10 is not deposited on the surfaces S of the pixels R, G, and B. Then, by selecting the electrodeposition time, current, etc., the space between the pixels R1, G, and B is completely filled with the T-coating paint 10, and the surface of the calamatrinogus is smoothed. In this way, a color filter with a smooth surface can be obtained. Next, a transparent electrode such as an ITo film (In-5n oxide film) for driving a liquid crystal is formed on the surface of the color filter, and the color filter is incorporated into the liquid crystal display.

FIG. 4 shows a second embodiment. In the embodiments shown in FIGS. 1 and 2, electrodeposition is performed on the black matrix 4, but the black matrix can be replaced with any conductive film. If the conductive film used is not black, and the electrodeposition paint is black, the electrodeposition paint acts as a black matrix.

Figure 4 I: 8, 2 is the substrate, R, G, B are pixels, 12
is an IT○ film (In, 0
．． -5n○2 conductive transparent film). A black electrodeposition paint 13 was deposited in the recesses between the pixels R, G, and B using the ITO film 12 as an electrode to smooth the spaces between the pixels. In this case, other I
All the film types such as TO film are used to drive the liquid crystal layer (not shown).

Although all specific embodiments have been described here, the present invention is not limited thereto; for example, a smooth film such as epoxy/resin may be further applied after electrodeposition.

[Effects of the Invention] In this invention, electrodeposition is performed using a conductive film to form concave portions on the surface of a color filter! Fill with secondary electrodeposition paint.

This method is inexpensive, suitable for mass production, and allows for uniform filling. According to the present invention, a color filter with a smooth surface can be obtained, transparent electrodes can be easily formed, and troubles such as disconnection of the transparent electrodes can be prevented.

[Brief explanation of drawings]

The first section is a process diagram of the example, FIG. 2 (A) is a cross-sectional view of the color filter after black matrix formation, and FIG.
) is a sectional view of the color filter after color matrix formation, and FIG. 2(C) is a diagram showing the electrodeposition process. Also the third
The figure is a sectional view of essential parts of the color filter after manufacture. FIG. 4 is a sectional view of the second embodiment. In the figure, 2 substrate, 4 metal black matrix, R, G, B pixels, 10.13 paint, 12
1TO membrane.

Claims (1)

[Claims] (1) After forming a conductive film and a color matrix on a substrate, using this conductive film as one electrode, an electrodeposition paint is deposited on the conductive film by an electrodeposition method to form the elements of the color matrix. A method for producing a color filter, comprising the steps of filling the spaces between the elements with electrodeposition paint and smoothing the surfaces between the elements of the color matrix.