Azo pigment, colorant for color filter, coloring composition for color filter, and color filter

Abstract

The object of the present invention is to provide a coloring composition for color filters, which not only has excellent fastness such as heat resistance and light resistance, has less foreign matter in the coating film, and has good storage stability, but also has high brightness and contrast, and expresses The film thickness becomes thinner for the same color. The aforementioned problems are solved by an azo pigment composed of a compound represented by the following general formula (1) or (2). In general formula (1), R 1 represents a halogen atom, an optionally substituted alkyl group, an optionally substituted alkoxy group, or an optionally substituted aryloxy group. R 2 and R 3 Each independently represents a hydrogen atom, an alkyl group which may have a substituent, or a phenyl group which may have a substituent. x 1 ~X 4 independently represent a hydrogen atom, an alkyl group that may have a substituent, an alkoxy group that may have a substituent, a hydroxyl group, a cyano group, a nitro group, a carboxyl group, a sulfo group or a halogen atom,

Description

technical field [0001] The present invention relates to a colorant for color filters (Color Filter) used in the manufacture of color filters used in color liquid crystal display devices and color solid-state imaging devices, etc., a coloring composition, and a color filter formed using the same . Background technique [0002] A liquid crystal display device is a display device in which a liquid crystal layer sandwiched between two polarizers adjusts the degree of polarization of light transmitted through the first polarizer and controls the amount of light transmitted through the second polarizer to display. As a mainstream liquid crystal display device, a twisted nematic (TN) type liquid crystal is used. Another representative method of liquid crystal display devices is the in-plane switching (In-Plane Switching, IPS) method in which a pair of electrodes are provided on a substrate on one side and an electric field is applied in a direction parallel to the substrate, so th...

AI Technical Summary

Problems solved by technology

Among them, because the spectral transmittance of C.I. Pigment Red 177 is lower than that of C.I. Pigment Red 254, the spectral shape is not good, so there is a disadvantage that the brightness will decrease with the addition of C.I. Pigment Red 177

However, the methods of Patent Documents 1 to 3 cannot obtain sufficient brightness, and further improvement is required.

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