JPH01210902A - Color filter - Google Patents

Abstract

PURPOSE:To prevent deterioration of a solid-state image pickup element and liquid crystal display element by alkali ions by using specific materials without contg. alkali metal elements for the photocrosslinking agent and pH control agent of a photosensitive resin. CONSTITUTION:Ammonium dichromate is used as the photocrosslinking agent of a natural peptide resin. Org. base salts without contg. alkali metal ions or hydroxide salts of quaternary ammonium ions, for example, imidazole, tetraethyl ammonium hydroxide, tetramethyl ammonium hydroxide, etc., are used as the pH control agent. Since the alkali metal elements are not contained in the photocrosslinking agent and the pH control agent in such a manner, the diffusion of the alkali metal ions by change with lapse of time and the deterioration of characteristics are obviated and the life is improved even if said agents are used for the color filters of the solid-state image pickup element and liquid crystal display element.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a color filter used in a color solid-state image pickup device or a color liquid crystal display device, which is the heart of a video camera.

<Technical Background of the Invention> A color filter used for colorizing a color solid-state imaging device or a liquid crystal display device is, for example, as shown in FIG. Green (G), Blue (B
) are finely arranged in a matrix, mosaic, or stripe pattern, and the structure is as shown in Figure 2. Some include an intermediate film (3). In any case, the filter layer (2) is in contact with the solid-state imaging element or the liquid crystal of the liquid crystal display device, either directly or indirectly through an intervening layer.

The filter layer constituting such a color filter includes
Since high-precision patterns in micron order are required, a photosensitive resin that can be patterned by photographic means is used as a material, and the resin is required to be easily dyed. , gelatin, low molecular weight gelatin, casein, egg white, and other natural peptide resins (sometimes called peptide resins) are used as resin components, and photosensitive resins are used that use dichromate as a photocrosslinking agent.

<Problems to be Solved by the Invention> However, the photosensitive resin whose main components are the peptide resin and dichromate is modified by adding an alkaline component to
It is necessary to adjust the value to a value of 6 to 7, and sodium hydroxide (NaOII) and potassium hydroxide (KOH) are added as plHIl stabilizers. These alkali metal ions (sodium ions, potassium) remain in the filter layer, and as they change over time, they can diffuse into the solid-state image sensor and the liquid crystal of the liquid crystal display, potentially causing element deterioration and failure of the liquid crystal display. Ta.

That is, the present invention aims to prevent deterioration of an image sensor and a liquid crystal display device due to diffusion of alkali metal ions in a color filter.

In other words, the present invention provides a color filter in which a cured layer of a photosensitive resin whose main components are a natural peptide resin and a dichromate as a photocrosslinking agent is dyed with a dye. A color characterized in that ammonium dichromate is used as the dichromate, and organic bases that do not contain alkali metal ions or hydroxide salts of quaternary ammonium ions are used as the PL+ adjuster of the photosensitive resin. It's a filter.

Examples of the pH adjuster used in the present invention include imidazole, tetraethylammonium hydroxide, and tetramethylammonium hydroxide. These are recommended because of their ease of availability and low purchase cost, but of course they are not limited to these.

Effect> The photosensitive resin which is the main component of the color filter of the present invention does not contain any alkali metal element in its photocrosslinking agent and pH adjusting agent. Therefore, even when the color filter of the present invention is used in a solid-state image sensor tower liquid crystal display device, alkali metal ions will not diffuse from the filter due to changes over time, thereby improving the life of the image sensor and the liquid crystal display device.

<Example 1> As a water-soluble photosensitizer, 20% by weight of a hydrolyzate of bovine bone peptide (average molecular weight 10,000) and ammonium dichromate 4
Pebquid photosensitive material consisting of % by weight, imidazole 3
The pi was adjusted to 6°6 by adding 0% aqueous solution. Using this photosensitive material, it was coated on a glass substrate with a rotary coater to a thickness of 1.0 μm, exposed and developed, and the thickness was 0.8 μm.
A micrometer striped leaf pattern was obtained. This was dyed under the conditions shown in Table 1 to form a red filter layer. After fixing with tannic acid and tartarite, a striped relief pattern with a thickness of 0.8 μm was similarly formed, and a second color green dyed layer was formed. A third color blue filter layer was formed by the same operation again to obtain a color separation filter for a solid-state imaging device. There were no particular operational problems.

Table 1 □ Water
1000cc at 60°C for 3 minutes at 60°C for 2 minutes and 30 seconds at 50'C for 2 minutes <Example 2> The same operation as in Example 1 was carried out using Fishini Glue instead of the hydrolyzate of bovine bone peptide as the water-soluble resin. However, we obtained similar results.

<Example 3> Ammonium dichromate was added to a hydrolyzate of bovine bone peptide (average molecular weight 15,000), the pH was adjusted to 6.6 with a 10% aqueous solution of tetraethylammonium hydroxide, and the same operation as in Example 1 was carried out. However, a mosaic pattern was formed and a color filter for LCD was obtained.

(The thickness of the dyed layer was 2 μm.) <Effects> The color filter of the present invention is as described above, and since the dyed layer material is a photosensitive resin with a reduced content of alkali metal ions, it is solid. When used in color filters on field image elements and color filters for liquid crystal display devices, it prevents the characteristics of the image sensor from deteriorating due to the diffusion of alkali metal ions and the durability of the liquid crystal display from decreasing, and can withstand long-term use. becomes.

Special permission person Toppan Printing Co., Ltd. Representative: Kazuo Suzuki

Claims (1)

[Claims] (1) Ammonium dichromate is used as the dichromate in a color filter made by dyeing a cured layer of a photosensitive resin whose main components are natural peptide resin and dichromate as a photocrosslinking agent. and a color filter characterized in that an organic base containing no alkali metal ion or a hydroxide salt of a quaternary ammonium ion is used as a pH adjuster for a photosensitive resin.