JPS62280807A - Color filter - Google Patents

Abstract

PURPOSE:To obtain a dye having excellent resistance to heat, solvents and light by incorporating respectively specific quinacridone deriv. and isoindolinone deriv. into the dye. CONSTITUTION:This dye has simultaneously the dye layers formed the quinacridone deriv. expressed by the formula I and the isoindolinone deriv. expressed by the formula II on a substrate. The dye of the quinacridone deriv. expressed by the formula I and the dye of the isoindolinone deriv. expressed by the formula II have the properties that the dyes are not decomposed by heating and are easily sublimated upon increasing of the temp. to the prescribed degree or above. These dyes are suitable for vacuum deposition; further, the films of these dyes have the good adhesiveness, to inorg. matter. The color filter formed by using such dyes have the excellent resistance to heat, solvents and light and since the color filter is formable by vapor deposition, the filter is inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application) The present invention relates to a color filter for color separation.

(Prior art and gaps) Conventionally, as color filters for color separation, dye filters that utilize absorption of dyes or pigments are well known.

This dye filter has been made by various methods.

For example, there are dyeing methods in which a colored layer with a predetermined pattern made of a synthetic or natural polymer material such as polyvinyl alcohol or gelatin is provided on a substrate, and the colored layer is dyed with a desired dye. It is made by a method such as vapor deposition, which forms a filter by vacuum deposition on a substrate.

Among these, filters made by dyeing methods have a large number of dyes that can be used, so it is easy to obtain filters with desired spectral characteristics, but when forming multiple colors, it is necessary to This method is unfavorable from a cost standpoint (it is expensive) because it requires the creation and peeling process of a photoresist resist film.

On the other hand, products made using the vapor deposition method have the advantage of being able to reduce the thickness of the filter film because the dye itself becomes the colored layer, and the heat resistance of the dye itself is superior to dyes that can be used using the dyeing method. have. However, there are limitations on the dyes that can be molded, making it difficult to obtain desired spectral characteristics.Even if vapor deposition is possible, for example, the vapor-deposited film may be dissolved by solvent treatment during patterning in the photolithography process. There were drawbacks. Another drawback is that the dyes used in conventional dye filters have poor light resistance.

(Specific means for solving interlayer points) The present invention eliminates the above-mentioned drawbacks and provides a color filter that is made of a dye that has excellent heat resistance, solvent resistance, and light resistance, and also has good spectral characteristics. Therefore, a structure was adopted in which a dye layer in which a quinacridone derivative represented by the following structural formula (A) and an isoisotrinon derivative dye represented by the following structural formula (B) were formed on a substrate was provided at the same time.

Here, R1 is H, CH3, or CI.

Structural formula (B) This color filter may be used as a single color filter with one color, or it may be used as a two-dimensional periodic array of minute color filters of several colors as picture elements on a substrate. It can be used as a space-division type color-separating color filter configured in an array. In this case, the dye of the present invention will be used for each color tone. for example,
On a liquid crystal display, a minute red color (R) corresponding to each picture element is displayed.
), green (G), and blue (B) three primary color filters formed in a mosaic or stripe pattern and a liquid crystal element, the liquid crystal element corresponding to each picture element can be controlled independently. By controlling the selection of each picture element in a timely manner, full color or multicolor display can be achieved.

The color filter of the present invention can be used for the above-mentioned displays.

It can also be used as a color separation filter for solid-state imaging devices such as COD.

Moreover, the color filter of the present invention has the above-mentioned structural formulas A and B.
It may be either a structure in which layers made of each dye are laminated, or a structure in which two dyes are deposited simultaneously to form a dye layer formed by mixing the dyes (the effect is the same).

(Function) The quinacridone derivative dye represented by the above structural formula (A) and the isoisotrione derivative dye shown by the above structural formula (B) do not decompose even when heated, and when the temperature exceeds a predetermined temperature, It has the property of easily sublimating and is very suitable for forming a dye layer by vacuum deposition. moreover,
The dye film is a very dense film and has good adhesion to an inorganic material such as a glass substrate.

Further, the dye layer hardly dissolves in organic solvents such as alcohols, ketones, and esters, and has very excellent solvent resistance. Therefore, the color filter of the present invention has excellent heat resistance, solvent resistance, and light resistance, and is inexpensive because it can be formed by vapor deposition.

Hereinafter, the present invention will be explained based on examples.

(Example 1) A transparent substrate to which a metal mask with a predetermined mosaic pattern was attached, a molybdenum board (1) containing a dye in which R1 is H in the above structural formula (A), and a molybdenum board (1) containing a dye in which R1 is H in the above structural formula (B). A molybdenum board (2) containing a dye whose R2 is + is installed in a vacuum evaporator, and the degree of vacuum is 1.
It was evacuated to 0-6 to 1 O-7 Torr.

The board (1) was heated to 450-480°C and deposited on a transparent substrate to a thickness of about 4000-5000. Subsequently, the board (2) was heated to 300-350'C and deposited on a transparent substrate to a thickness of about 5000-6000A. A dye layer was formed in which the structural formulas (A) and (B) patterned in accordance with the mosaic pattern of the metal mask were sequentially laminated. This two-layer laminated dye layer exhibited good red spectral characteristics.

As a method for patterning the color filter, in addition to using the metal mask described above, a normal photolithography technique such as a lift-off method may be used.

(Example 2) A dye layer was formed by vapor deposition using the same configuration and method as in Example 1, except that two types of quinacridone derivative dyes in which R1 in the structural formula (A) was CH3 and CI were used. These two types of dye layers exhibited good red spectral characteristics.

In addition, for comparison, an azo dye (trade name: Symuler Red), which is a typical dye having a magenta color similar to that of the quinacridone derivative shown in the structural formula (A), was used.
3042S, manufactured by Dainippon Ink Co., Ltd.) with the above structural formula (A
) was used in place of the quinacridone derivative shown in ), and a vapor deposition film was obtained using the same method, but good spectral characteristics were not obtained.

A dye layer was formed by vapor deposition using the same configuration and method as in Example 1 except that an indolinone derivative dye was used.

These dye layers also showed good red spectral properties.

In addition, for comparison, an azo dye (trade name: Symuler Fas), which is a typical dye having a yellow color similar to that of the isoisotrinon derivative represented by the structural formula (B), was used.
tYellow 4119 (manufactured by Dainippon Ink Co., Ltd.) was used in place of the isoisotrinon derivative represented by the structural formula (B) in the same manner, and a deposited film was obtained, but a good result was obtained. No spectral characteristics were obtained.

In order to clarify the effects of the present invention, a heat resistance test and an accelerated light resistance test using a xenon lamp (xenon lamp illuminance, 1.OX 106Lux, irradiated at a distance of 5cm) were carried out.
I did it. Samples include those made of quinacridone derivatives and isoisotrione derivatives prepared in Examples 1 to 3 above, those made of azo derivatives and isoisotrione derivatives prepared for comparison in Example 2, and those made of the azo derivatives and isoisotrione derivatives prepared in Example 2 for comparison. Color filters made of quinacridone derivatives and azo derivatives prepared in Example 3 were used. First, as a result of a heat resistance test, color filters made from quinacridone and isoisotrinon dyes were tested at temperatures between 250°C and 30°C.
It had a heat resistance temperature of 0°C. On the other hand, color filters containing azo dyes began to discolor at about 170°C, indicating that among the components of each filter, the azo dyes deteriorated and discolored.

Next, as a result of a light resistance test, no deterioration was observed in any of the color filters formed from quinacridone-based and isoisotrinon-based dyes even after 60 hours or more. On the other hand, color filters containing azo dyes undergo a discoloration phenomenon in about 10 hours, and due to these hue changes,
It was found that the azo pigment component had deteriorated. That is, the filter consisting of an azo type and an isoisotrinon type changed its color from an initial red to yellow, and the filter consisting of a quinacridone type and an azo type changed its color from an initial red to a magenta color.

(Effect of the invention)

Claims (1)

[Claims] (1) In a color filter having one or more dye layers formed using at least two or more types of dyes, a quinacridone derivative represented by the following structural formula (A) as the dye and the following structural formula (B) A color filter characterized by containing an isoisotrinon derivative represented by: Structural formula (A) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ Here, R_1 is either H, CH_3, or Cl. Structural formula (B) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ Here, R_2 is ▲There are mathematical formulas, chemical formulas, tables, etc.▼ or ▲There are mathematical formulas, chemical formulas, tables, etc.▼.