JPS61290407A - Formation of color filter - Google Patents

Abstract

PURPOSE:To obtain a color filter which is free from uneven film thickness and uneven dyeing by controlling the quantity of the light to be exposed to a photosensitive film formed by mixing a Cr compd. which accelerates crosslinking reaction by exposing to protein in which the crosslinking position and dye fixing seat are common thereby forming dyed and non-dyed regions. CONSTITUTION:A liquid of casein provided with photosensitivity is coated on a transparent substrate 10 and is dried to form the photosensitive film 11 having 1mum thickness. The film is subjected to full-surface exposing for several seconds along and is then selectively exposed for several tens second by using such a photomask 13 which does not expose the parts 12 necessary for dyeing to form the parts which are not dyed. The film is developed, washed and dried and is then dyed by using an acid dye. The dyed film is coated with a transparent intermediate layer 15. Parts 16 required for the 2nd color and unnecessary parts 17 are similarly formed and are dyed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of forming a color filter.

2. Description of the Related Art Conventional methods for forming color filters are known, for example, from Japanese Patent Publication No. 62
A forming method such as that described in Japanese Patent No. 17375 is widely adopted.

The conventional method for forming a color filter will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of a color filter made by a conventional forming method. A photosensitive liquid made of casein, gelatin, etc. imparted with photosensitivity is uniformly applied onto a glass substrate 1 and dried to form a dyeable photosensitive film. Thereafter, only the portion 2 to be dyed is photocured using a mask exposure method, and unnecessary portions are removed by development. Next, the portion 2 is dyed with a dye having spectral characteristics of a predetermined first color. After dyeing is finished, it is covered with a transparent intermediate layer 3. Next, a dyeable photoresist film is formed on this intermediate layer 3 in the same manner as described above, and a portion 4 dyed in the second color is formed in the same manner as described above. If more colors are needed, repeat the above process.

Finally, a transparent protective film 6 is formed.

Problems to be Solved by the Invention However, in the above configuration, due to the influence of the difference in level between the dyed portion 2 and the glass substrate 1, the intermediate layer 3 formed thereon and the intermediate layer 3 formed thereon. The thickness of the dyeable photoresist film sometimes changed partially. In particular, changes in the thickness of the photoresist film have the problem of causing uneven dyeing during subsequent dyeing.

The present invention has been made to solve these problems, and provides a method for forming a color filter that can completely eliminate uneven dyeing of the color filter by forming each photoresist film layer flatly. It is something.

Means for Solving the Problems In order to achieve the above object, the method for forming a color filter of the present invention involves adding chromium to a protein that has a common crosslinking site and a dye staining site by exposing it to chromium to promote the crosslinking reaction. A photoresist film made by mixing compounds is formed by controlling the amount of light to be exposed to form areas that are dyed with a dye and areas that are not dyed.

Function: Proteins such as gelatin and casein are used as fillers in the dyeable photosensitive film used in color filters, and chromium compounds are used to impart photocurability. Chromium in a chromium compound becomes Dr (
When Vl) is reduced to CraD), it coordinates with the NH group and CONH group, promoting the crosslinking reaction. Moreover, the dyeing site of the dye is an NH group or a C0NH group. That is, the crosslinking site and the staining site are common. Therefore, the crosslinking reaction and the dyeing reaction can be controlled by making the ratio of chromium and NH group or CONH group of the crosslinking agent appropriate and by making the amount of light appropriate.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows step-by-step a method for forming a color filter according to an embodiment of the present invention. A mixture of 2rsg of casein and 6cc of 20 wt% ammonium dichromate aqueous solution was applied onto the transparent substrate 10 and dried to form a film with a thickness of 1 μm.
A photoresist film 11 is formed.

This is exposed over the entire surface for several seconds using an exposure device. (FIG. 1(&)) Next, using a photomask 13 that does not expose the portion 12 that requires dyeing, selective exposure is performed for several tens of seconds to create a portion 14 that will not be dyed. (FIG. 1(b)) The photoresist film subjected to the above treatment is developed, washed, and dried to form a film. After that, dyeing is performed using an acid dye. When cyan is dyed, the part shown at 12 in the figure shows predetermined spectral characteristics, but the part shown at 14 is not dyed and has a transmittance of 86% or more in the entire wavelength range of the incident light. Does not exhibit cyan absorption. (FIG. 1(C)) After dyeing, it is covered with a transparent intermediate layer 15, and the necessary portions 16 and unnecessary portions 17 of the second color are formed by the same process, and dyeing is applied. (FIG. 1(d)) Although casein is used in the present invention, other proteins such as gelatin may be used. Further, the transparent intermediate layer may also be made of casein or the like formed under exposure conditions that do not cause dyeing.

Furthermore, in this embodiment, the amount of light that exposes the photoresist film is adjusted by dividing the exposure into two exposures, but the adjustment of the amount of light is not limited to this. For example, there may be a partial difference in the amount of transmitted light. It goes without saying that by using a certain mask, it is possible to form regions that will be dyed and regions that will not be dyed in a single exposure.

Effects of the Invention As described above, the method of the present invention makes it possible to form color filters with no uneven film thickness and no uneven dyeing.
The effect is great.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing step-by-step a method of forming a color filter according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional color filter. 10...Transparent substrate, 11...Photoresist film,
12゜16... Parts that require dyeing, 13...
... Photomask, 14.17 ... Part that does not require dyeing, 16 ... Intermediate layer.

Claims (2)

[Claims] (1) Areas that are dyed with a dye by adjusting the amount of light exposed to a photosensitive film made by mixing a protein with a common crosslinking site and a dye dyeing site and a chromium compound that accelerates the crosslinking reaction upon exposure to light. and a non-dyed area. (2) The method for forming a color filter according to claim 1, in which the amount of light to be exposed is adjusted by full-surface exposure that causes photocuring while retaining dyeing properties, and local exposure that causes loss of dyeing properties.