Blue dye compound, blue resin composition for color filter containing same and color filter using same

Abstract

Disclosed is a blue dye compound for a color filter represented by Chemical Formula 1. The blue colored resin composition including the blue dye compound has excellent solubility to an organic solvent, such as propylene glycol methyl ether acetate (PGMEA), excellent miscibility with the other dyes or pigments and high heat resistance. Therefore, when using the blue dye compound, it is possible to obtain a color filter having high luminance and contrast.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a blue dye compound for a color filter. More particularly, the present disclosure relates to a novel triarylmethane dye compound having improved solubility and higher heat resistance as compared to to the conventional dyes, a blue colored resin composition for a color filter including the same, and a color filter using the same.BACKROUND ART[0002]A liquid crystal display uses optical and electrical properties of a liquid crystal material to display images. Such a liquid crystal display has some advantages, including light weight, low power consumption and low driving voltage, as compared to cathode ray tubes (CRT), plasma display panels, or the like. A liquid crystal display includes a liquid crystal layer disposed between one glass substrate and another glass substrate. The light emitted from a light source passes through the liquid crystal layer, which controls the transmission of light. The light that has passed through the l...

AI Technical Summary

Benefits of technology

The present disclosure describes a triarylmethane blue dye compound that has excellent solubility and high heat resistance. This compound has improved color characteristics compared to pigments and is suitable for use as a colorant in a color filter. The blue dye compound is represented by the Chemical Formula 1, which describes a triarylmethane compound containing a specific anion and various alkyl and aromatic hydrocarbon groups. The technical effect of this patent is to provide a novel blue dye compound for use in color filters that satisfies the requirements of high solubility, high heat resistance, and high luminance.

Problems solved by technology

Although methods using a dye have been discussed to date, use of a dye causes problems of lower heat resistance, photoresistance and chemical resistance as compared to a pigment, and thus shows limited applicability.

In addition, in the case of a dyeing method, a complicated process is required, resulting in poor cost efficiency.

Although a pigment has lower transparency than a dye, such a disadvantage has been overcome by advanced technology of micronization and dispersion of a pigment.

However, the pigment powder obtained from its synthesis cannot be used as it is, because preparation of a pigment dispersion requires a stable dispersion state and easy micronization.

Moreover, a number of additives, such as a dispersing agent and pigment derivative, are required, and a very complicated and cumbersome process is required to obtain a pigment dispersion.

In addition, such a pigment dispersion requires complicated storage and transport conditions to maintain its optimal quality state.

In addition, micronization of a pigment causes a rapid increase in surface area of pigment, degradation of dispersion stability and generation of non-uniform pigment particles.

For these reasons, it is difficult to produce a color resist.

However, the above-mentioned problems related with pigment micronization and dispersion stability lead to insufficient improvement of physical properties of a color filter using a pigment as a colorant.

Thus, it is not possible to improve physical properties significantly.

However, such a triarylmethane dye has low solubility to a solvent used for a colored composition for a color filter and shows poor heat resistance.

Particularly, there is a tendency to prohibit use of cyclohexanone since it is an environmentally harmful material.

However, such a compound has low solubility to propylene glycol monomethyl ether acetate (PGMEA) and shows poor heat resistance.

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