# US 9,436,032 B2 · Liquid crystal display device

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- Number: US 9,436,032 B2
- Document ID: US9436032B2
- Status: Granted
- Kind: B2
- Application number: 14/420,610
- Filed: 2013-12-24
- Published: 2016-02-25
- Granted: 2016-09-06
- Earliest claimed: 2013-12-24
- Assignees: DIC Corporation
- Applicants: Dic Corporation
- Inventors: Takeshi Kuriyama; Jouji Kawamura; Junichiro Koike; Hiroshi Maki; Masami Shishikura; Ryosuke Asami
- Web page: https://patentgrep.com/patent/US9436032B2

## CPC

- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- C09K 19/20: linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers}
- C09K 19/3066: {in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers}
- G02B 5/201: {in the form of arrays}
- G02F 1/133514: {Colour filters}
- C09K 2019/0466: {the linking chain being a -CF2O- chain}
- C09K 2019/122: {Ph-Ph}
- C09K 2019/123: {Ph-Ph-Ph}
- C09K 2019/124: {Ph-Ph-Ph-Ph}
- C09K 2019/3004: {Cy-Cy}
- C09K 2019/3009: {Cy-Ph}
- C09K 2019/301: {Cy-Cy-Ph}
- C09K 2019/3016: {Cy-Ph-Ph}
- C09K 2019/3019: {Cy-Cy-Ph-Ph}
- C09K 2019/3025: {Cy-Ph-Ph-Ph}
- C09K 2019/3422: {the heterocyclic ring being a six-membered ring}
- 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
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

There is provided a liquid crystal display device that includes a liquid crystal composition and a color filter having a particular slope parameter that indicates the degree of aggregation of an organic pigment. The liquid crystal display device prevents a decrease in the voltage holding ratio (VHR) and an increase in the ion density (ID) in a liquid crystal layer and resolves the problems of display defects, such as white streaks, variations in alignment, and image sticking. The liquid crystal display device prevents a decrease in the voltage holding ratio (VHR) and an increase in the ion density (ID) in a liquid crystal layer and suppressing display defects such as image sticking. Therefore, the liquid crystal display device is useful for active matrix driving liquid crystal display devices with an IPS mode or an FFS mode and can be applied to liquid crystal display devices.

## Claims

### Claim 1

A liquid crystal display device comprising a first substrate, a second substrate, a liquid crystal composition layer sandwiched between the first substrate and the second substrate, a color filter constituted by a black matrix and at least RGB three-color pixel portions, a pixel electrode, and a common electrode,
wherein the liquid crystal composition layer contains a liquid crystal composition that contains one or more compounds represented by general formula (I),
(in the formula, R31 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms; M31 to M33 each independently represent a trans-1,4-cyclohexylene group or a 1,4-phenylene group, one or two —CH2— in the trans-1,4-cyclohexylene group may be substituted with —O— as long as oxygen atoms are not directly adjacent to each other, and one or two hydrogen atoms in the phenylene group may be substituted with fluorine atoms; X31 and X32 each independently represent a hydrogen atom or a fluorine atom; Z31 represents a fluorine atom, a trifluoromethoxy group, or a trifluoromethyl group; n31 and n32 each independently represent 0, 1, or 2 and n31+n32 is 0, 1, or 2; and when a plurality of M31 and M33 are present, the plurality of M31 may be the same or different and the plurality of M33 may be the same or different) and that contains one or more compounds selected from the group consisting of compounds represented by general formula (II-a) to general formula (II-f),
(in the formulae, R19 to R30 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; and X21 represents a hydrogen atom or a fluorine atom),
the color filter is a color filter containing an organic pigment, the organic pigment having a slope parameter of 2 or less,
wherein in a scattering profile analysis of the organic pigment in the color filter, the analysis including a step (A) of measuring an ultra-small angle X-ray profile of the organic pigment by ultra-small angle X-ray scattering, a step (B) of calculating a curve point on the scattering profile, a step (C) of calculating an analysis region (c1) set in accordance with the curve point, and a step (D) of calculating the slope parameter in the analysis region c1.

### Claim 2 (depends on 1)

The liquid crystal display device according to claim 1, wherein the organic pigment has a slope parameter of 1.5 or less.

### Claim 3 (depends on 1)

The liquid crystal display device according to claim 1, wherein in the color filter, a volume fraction of particles having a particle size of 100 nm or more and 1000 nm or less relative to all particles of the organic pigment is 7% or less.

### Claim 4 (depends on 1)

The liquid crystal display device according to claim 1, wherein the organic pigment has a maximum transmission wavelength of 600 nm or more and 700 nm or less.

### Claim 5 (depends on 1)

The liquid crystal display device according to claim 1, wherein the organic pigment has a maximum transmission wavelength of 500 nm or more and 600 nm or less.

### Claim 6 (depends on 1)

The liquid crystal display device according to claim 1, wherein the organic pigment has a maximum transmission wavelength of 400 nm or more and 500 nm or less.

### Claim 7 (depends on 1)

The liquid crystal display device according to claim 1, wherein the organic pigment is dispersed in a coating film formed on a glass substrate.

### Claim 8 (depends on 1)

The liquid crystal display device according to claim 1, wherein the compounds represented by the general formula (I) are compounds represented by general formula (I-a) to general formula (I-f),
(in the formulae, R32 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms; X31 to X38 each independently represent a hydrogen atom or a fluorine atom; and Z31 represents a fluorine atom, a trifluoromethoxy group, or a trifluoromethyl group).

### Claim 9 (depends on 1)

The liquid crystal display device according to claim 1, wherein the liquid crystal composition layer further contains one or more compounds selected from the group consisting of compounds represented by general formula (III-a) to general formula (III-f),
(in the formulae, R41 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms; X41 to X48 each independently represent a hydrogen atom or a fluorine atom; and Z41 represents a fluorine atom, a trifluoromethoxy group, or a trifluoromethyl group).

### Claim 10 (depends on 1)

The liquid crystal display device according to claim 1, wherein the liquid crystal composition layer contains a polymer obtained by polymerizing a liquid crystal composition containing one or more polymerizable compounds.

### Claim 11 (depends on 1)

The liquid crystal display device according to claim 1, wherein the liquid crystal composition layer contains a bifunctional monomer represented by general formula (V),
(in the formula, X51 and X52 each independently represent a hydrogen atom or a methyl group; Sp1 and Sp2 each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O—(CH2)s— (where s represents an integer of 2 to 7 and the oxygen atom bonds to an aromatic ring); Z51 represents —OCH2—, —CH2O—, —COO—, —OCO—, —CF2O—, —OCF2—, —CH2CH2—, —CF2CF2—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH2CH2—, —OCO—CH2CH2—, —CH2CH2—COO—, —CH2CH2—OCO—, —COO—CH2—, —OCO—CH2—, —CH2—COO—, —CH2—OCO—, —CY1═CY2— (where Y1 and Y2 each independently represent a fluorine atom or a hydrogen atom), —C≡C—, or a single bond; and
M51 represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group, or a single bond and, in all the 1,4-phenylene groups in the formula, any of hydrogen atoms may be substituted with fluorine atoms).