# US 8,465,886 B2 · Color filter substrate for liquid crystal display devices and liquid crystal display devices

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- Number: US 8,465,886 B2
- Document ID: US8465886B2
- Status: Granted
- Kind: B2
- Application number: 12/926,034
- Filed: 2010-10-21
- Published: 2011-04-28
- Granted: 2013-06-18
- Earliest claimed: 2009-10-23
- Assignees: Toppan Printing Co., Ltd.
- Applicants: Mie Shimizu; Takeshi Ikeda; Hidesato Hagiwara; Koichi Minato
- Inventors: Mie Shimizu; Takeshi Ikeda; Hidesato Hagiwara; Koichi Minato
- Web page: https://patentgrep.com/patent/US8465886B2

## CPC

- G02B 5/201: {in the form of arrays}
- G02F 1/133514: {Colour filters}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

Disclosed is a color filter substrate which exhibits color filter contrast of not less than 9000 and includes a transparent substrate, and a plurality of color pixels differing in color and formed on the transparent substrate, wherein each of the plurality of color pixels is formed of a photosensitive color composition containing two or more kinds of pigments, a birefringence Δn of a pigment dispersion represented by following equation (1) and a content of pigments contained in the photosensitive composition satisfies prescribed conditions, and, an absolute value of retardation in thickness direction (Rth) of the color pixels which is represented by following equation (2) is confined to a range of 0-3 nm. Δn=nXY−nZ (1) Rth={(Nx+Ny)/2−Nz}×d (2)

## Claims

### Claim 1

A color filter substrate which exhibits color filter contrast of not less than 9000 and comprises:
a transparent substrate; and
a plurality of color pixels differing in color and formed on the transparent substrate,
wherein each of the plurality of color pixels is formed of a photosensitive color composition containing two or more kinds of pigments, a birefringence Δn of a pigment dispersion represented by following equation (1) and a content of pigments contained in the photosensitive composition satisfies all of below-described conditions (a), (b) and (c), and, an absolute value of retardation in thickness direction (Rth) of the color pixels which is represented by following equation (2) is confined to a range of 0-3 nm:
(a) a content of a pigment exhibiting an absolute value of birefringence Δn less than 0.011 is confined to 34% by mass to 100% by mass based on a total amount of pigments in the photosensitive color composition;
(b) (a content of pigment exhibiting an absolute value of birefringence Δn less than 0.011)>(a content of pigment exhibiting an absolute value of birefringence Δn not less than 0.011 and less than 0.016)≧0; and
(c) (a content of pigment exhibiting an absolute value of birefringence Δn not less than 0.011 and less than 0.016)≧(a content of pigment exhibiting an absolute value of birefringence Δn of 0.016-0.055)≧0:
Δn=nXY−nZ (1)
wherein nXY is an average in-plane refractive index; and nZ is a refractive index in thickness direction; and
Rth={(Nx+Ny)/2−Nz}×d (2)
wherein Nx is a refractive index in x-direction in plane of a color layer constituting the color pixel; Ny is a refractive index in y-direction in plane of a color layer constituting the color pixel; Nz is a refractive index in thickness direction of a color layer constituting the color pixel; Nx constitutes a lagging axis represented by Nx≧Ny; and d is a thickness (nm) of the color layer.

### Claim 2 (depends on 1)

The color filter substrate according to claim 1, wherein the plurality of color pixels differing in color each exhibits contrast of not less than 8000 as a monochrome color layer.

### Claim 3 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a red pixel and two or more kinds of pigments contained in the photosensitive color composition constituting the red pixel are formed of C.I. Pigment Red 254, C.I. Pigment Red 177 and C.I. Pigment Yellow 150.

### Claim 4 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a red pixel and two or more kinds of pigments contained in the photosensitive color composition constituting the red pixel are formed of C.I. Pigment Red 254, C.I. Pigment Red 177 and C.I. Pigment Yellow 138.

### Claim 5 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a green pixel and two or more kinds of pigments contained in the photosensitive color composition constituting the green pixel are formed of C.I. Pigment Green 58 and C.I. Pigment Yellow 150.

### Claim 6 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a green pixel and two or more kinds of pigments contained in the photosensitive color composition constituting the green pixel are formed of C.I. Pigment Green 36, C.I. Pigment Green 58 and C.I. Pigment Yellow 150.

### Claim 7 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a blue pixel and two or more kinds of pigments contained in the photosensitive color composition constituting the blue pixel are formed of C.I. Pigment Blue 15:6 and C.I. Pigment Violet 23.

### Claim 8 (depends on 1)

The color filter substrate according to claim 1, wherein one of the plurality of color pixels is a blue pixel, two or more kinds of pigments contained in the photosensitive color composition constituting the blue pixel are formed of C.I. Pigment Blue 15:6 and C.I. Pigment Violet 23, and the photosensitive color composition forming the blue pixel further contains a pigment derivative represented by the following chemical formula:

### Claim 9 (depends on 1)

A liquid crystal display device which is provided with the color filter substrate claimed in claim 1 and exhibits a color difference Δu′v′ of 0.02 or less.