JPH05241014A - Production of color filter - Google Patents

Abstract

PURPOSE:To prevent the disconnection of transparent electrodes occurring heretofore from level differences and to improve the productivity and reliability of a liquid crystal display element by applying a light shielding film resist to cover color films and an auxiliary film and subjecting the resist to self- alignment exposing, thereby forming a light shielding film. CONSTITUTION:The three primary color films 3 of red R, green G and blue B are formed on one surface of a transparent substrate consisting of glass, etc., so as to have spacings between the respective films. A liquid UV curing resin covering the color films is formed thereon. The UV curing resin is thereafter irradiated with UV rays from the side of the transparent substrate 2 and is thereby subjected to the self-alignment exposing, by which the UV curing resin existing in the spacings between the color films 3 is selectively cured and the auxiliary film 5 is formed. A light shielding film resist 5 covering the color films 3 and the auxiliary film 5 is further applied on the color filters 1 formed with the auxiliary film 5 and is subjected to the self-alignment exposing by the UV rays in the same manner as the formation of the auxiliary film 5, by which the light shielding film 7 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display device used as a display portion of a color TV, and more particularly to a method for manufacturing a color filter used in the color liquid crystal display device. is there.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show a conventional method of manufacturing a color filter 90 of this type. First, as shown in FIG. 6, red R, green G and blue are formed on a transparent substrate 91 made of glass or the like. The B color films 92 of the three primary colors are formed by, for example, a printing method so as to have a gap between the respective colors, and then a light shielding film resist 93 is applied so as to cover the color films 92, and then back exposure, that is, , The light-shielding film resist 93 by self-alignment exposure from the transparent substrate 91 side.
The light-shielding film resist 93 in the gap is exposed to form a light-shielding film 94 as shown in FIG. 7, and thereafter, as shown in FIG. 8, transparent protection is performed so as to cover the color film 92 and the light-shielding film 94. The layer 95 is formed, and a transparent electrode 96 for driving liquid crystal is usually formed on the surface of the transparent protective layer 95.

[0003]

However, in the color filter 90 according to the above-described conventional manufacturing method, since the light shielding film resist 93 originally has a low transmittance, the light shielding film thinner than the color film 92 is used. Inevitably, the color film 92 becomes 94 (see FIG. 7).
And a step between the light shielding film 94 and the transparent protective layer 9
Even after forming No. 5, the problem is not solved (see FIG. 8), and there is a problem that the transparent electrode 96 formed on the transparent protective layer 95 causes a disconnection accident at the edge portion, and the color filter 90 is used. When a liquid crystal cell is formed, there is a partial gap difference in the liquid crystal that is sealed inside, which causes problems such as deterioration of viewing angle characteristics that also impair the characteristics of the liquid crystal cell. It was supposed to be done.

[0004]

As a concrete means for solving the above-mentioned conventional problems, the present invention is one in which a color film of three primary colors is formed on a transparent substrate with a gap between each color, In a method of manufacturing a color filter in which a light-shielding film is formed in the gap, a UV-curable resin having a property of transmitting ultraviolet light is applied to the gap between the color films and cured by self-alignment exposure from the transparent substrate side. Is performed to form an auxiliary film that complements the film thickness difference between the light-shielding film and the color film, and then a light-shielding film resist that covers the color film and the auxiliary film is applied and self-alignment exposure is performed to By providing a method of manufacturing a color filter for liquid crystal, which is characterized in that a light-shielding film is formed so as to be flush with the color film, a surface of the color filter in contact with the liquid crystal is provided. Improve smoothness, it is intended to solve the conventional problems described above.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 to 4 show a method of manufacturing the color filter 1 according to the present invention in the order of steps. One surface of the transparent substrate 2 made of glass or the like is printed with red R, green G or blue by a printing method or the like. The color films 3 of the three primary colors of B are formed with a gap between them, and in the present invention, as shown in FIG. 1, a liquid ultraviolet curable resin 4 is applied to cover the color film 3 first.

After that, the UV curable resin 4 is irradiated with UV UV from the transparent substrate 2 side and self alignment exposure is performed to selectively cure the UV curable resin 4 in the gap of the color film 3. The auxiliary film 5 is formed as shown in FIG. 2. At this time, the exposure amount of the ultraviolet rays is adjusted so that the film thickness of the auxiliary film 5 becomes a predetermined value described later.

As shown in FIG. 3, the color filter 1 having the auxiliary film 5 formed thereon is further coated with a light-shielding film resist 6 covering the color film 3 and the auxiliary film 5 to form the auxiliary film 5. In the same manner as described above, self-alignment exposure with ultraviolet UV is performed to form the light shielding film 7.

Here, the auxiliary film 5 will be described again. The auxiliary film 5 eliminates a step caused by a difference in film thickness between the color film 3 and the light-shielding film 7, and the color film 3 and the light-shielding film 7 are eliminated. Are provided so as to be flush with each other. Specifically, the color film 3 is usually formed to have a film thickness in the vicinity of 2 μm, and the light shielding film 7 is included in the light shielding film resist 6. It is said that a film thickness of 0.8 μm or more cannot be obtained no matter how the exposure amount is increased due to the influence of the light-shielding pigment or the like. Therefore, the auxiliary film 5 has a film thickness difference between the two. It suffices to adjust the exposure amount so as to be 0.2 μm.

Further, since the auxiliary film 5 passes through the auxiliary film 5 and is exposed to the light-shielding film resist 6 when the light-shielding film 7 is formed, the ultraviolet curable resin 4 as a material is used.
In selecting (1), it is necessary to select a material having a light-transmitting property with respect to at least the wavelength range of ultraviolet rays when the light shielding film 7 is formed.

FIG. 4 shows a completed state of the color filter 1 obtained by the above-described manufacturing method. The color film 3 and the light shielding film 7 are flush with each other because the auxiliary film 5 is provided. In addition, the transparent electrode 8 laid on the upper surface of the liquid crystal display element can be prevented from causing a disconnection accident due to a step, and the liquid crystal gap of the liquid crystal display element assembled by using the color filter 1 can be reduced. It is assumed that the viewing angle characteristics are not impaired as they do not occur.

In actual practice, as shown in FIG. 5, the transparent protective layer 9 may be provided so as to cover the color film 3 and the light shielding film 7 of the color filter 1. In this case, the transparent protective layer 9 is provided. Fine irregularities formed on the surfaces of the color film 3 and the light-shielding film 7 are filled with the transparent protective layer 9 to obtain a smoother surface.

[0012]

As described above, according to the present invention, the ultraviolet curable resin having a translucency to ultraviolet rays is applied to the gaps between the color films so that the transparent substrates can be cured by the self-alignment exposure. Then, an auxiliary film is formed to supplement the film thickness difference between the light shielding film and the color film, and then a light shielding film resist is applied to cover the color film and the auxiliary film and self-alignment exposure is performed to perform the color film. By the method of manufacturing the color filter including the step of forming the light-shielding film so as to be on the same plane as that of the color filter, the step difference caused by the film thickness difference between the color film and the light-shielding film, which was inevitable in the past, The auxiliary film supplementally eliminates the above problem, thereby preventing the breakage of the transparent electrode caused by the above-mentioned step, and exerting an excellent effect in improving the productivity and reliability of the liquid crystal display element. A.

Further, since the step difference is eliminated, a liquid crystal gap difference does not occur in the liquid crystal display element, and an excellent effect can be obtained in addition to the performance improvement of the liquid crystal display element such as the improvement of the viewing angle characteristic. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a method of manufacturing a color filter according to the present invention in an auxiliary film forming step.

FIG. 2 is a sectional view showing the same example with an auxiliary film completed.

FIG. 3 is a sectional view showing the same embodiment in a light-shielding film forming step.

FIG. 4 is a sectional view showing the same embodiment in a completed state of a color filter.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional light-shielding film forming process.

FIG. 7 is a cross-sectional view showing a formation state of a light shielding film of the same conventional example.

FIG. 8 is a cross-sectional view showing a completed state of the same conventional color filter.

[Explanation of symbols]

 1 ... Color filter 2 ... Transparent substrate 3 ... Color film 4 ... UV curable resin 5 ... Auxiliary film 6 ... Light-shielding film resist 7 ... Light-shielding film 8 ... Transparent electrode 9 ... Transparent protective layer

Claims (1)

[Claims] 1. A method for manufacturing a color filter, wherein color films of three primary colors are formed on a transparent substrate with a gap between respective colors, and a light-shielding film is formed in the gap. Is coated with an ultraviolet curable resin having a translucency to ultraviolet rays and cured by self-alignment exposure from the transparent substrate side to form an auxiliary film for supplementing the film thickness difference between the light shielding film and the color film. It is characterized in that the light-shielding film resist is formed to cover the color film and the auxiliary film, and self-alignment exposure is performed to form the light-shielding film so as to be flush with the color film. Color filter manufacturing method.