# US 10,768,498 B2 · Liquid crystal display device

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- Number: US 10,768,498 B2
- Document ID: US10768498B2
- Status: Granted
- Kind: B2
- Application number: 15/583,156
- Filed: 2017-05-01
- Published: 2017-08-17
- Granted: 2020-09-08
- Earliest claimed: 2014-05-09
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Soon Joon Rho; Kyungmin Kim; Jin-Lak Kim; Hyelim Jang
- Web page: https://patentgrep.com/patent/US10768498B2

## CPC

- G02F 1/137: characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- C09K 19/02: characterised by optical, electrical or physical properties of the components, in general
- C09K 19/12: at least two benzene rings directly linked, e.g. biphenyls
- C09K 19/3001: {Cyclohexane rings}
- C09K 19/3003: {Compounds containing at least two rings in which the different rings are directly linked (covalent bond)}
- G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)}
- G02F 1/134309: {characterised by their geometrical arrangement}
- C09K 2019/123: {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 2019/3027: {Compounds comprising 1,4-cyclohexylene and 2,3-difluoro-1,4-phenylene}
- G02F 1/133703: {by introducing organic surfactant additives into the liquid crystal material}
- G02F 1/13712: {the liquid crystal having negative dielectric anisotropy}
- 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

## Abstract

A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal layer includes liquid crystal molecules having a negative dielectric anisotropy, a response speed of about 4.0 ms or less, and a rotational viscosity of about 47 mPa·S to about 75 mPa·S.

## Claims

### Claim 1

A liquid crystal display device, comprising:
a first substrate;
an opposing second substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate, the liquid crystal layer consisting of:
liquid crystal molecules represented by Chemical Formula 1 in an amount of 7% by weight to 13% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 2 in an amount of 23% by weight to 29% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 3 in an amount of 1% by weight to 5% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 4 in an amount of 39% by weight to 47% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 5 in an amount of 10% by weight to 16% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 7 in an amount of 3% by weight to 9% by weight of the liquid crystal layer;
wherein Chemical Formulas 1, 2, 3, 4, 5, and 7 are as follows:
wherein, in Chemical Formulas 1, 2, 3, 4, 5, and 7, R and R′ are each independently an alkyl or an alkoxy group having 1 to 7 carbons.

### Claim 2 (depends on 1)

The liquid crystal display device of claim 1, wherein the liquid crystal layer has a nematic isotropic transition temperature of 110° C. or more.

### Claim 3 (depends on 1)

The liquid crystal display device of claim 1, wherein the liquid crystal layer has a rotational viscosity of 52 mPa·S to 75 mPa·S when operating at a temperature between 40° C. and 50° C.

### Claim 4 (depends on 1)

The liquid crystal display device of claim 1, wherein the liquid crystal molecules of the liquid crystal layer have a negative dielectric anisotropy.

### Claim 5 (depends on 1)

The liquid crystal display device of claim 1, wherein the liquid crystal layer is configured to operate in a vertical alignment mode.

### Claim 6

A liquid crystal display device, comprising:
a first substrate;
an opposing second substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate, the liquid crystal layer consisting of:
liquid crystal molecules represented by Chemical Formula 1 in an amount of 7% by weight to 13% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 2 in an amount of 23% by weight to 29% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 3 in an amount of 1% by weight to 5% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 4 in an amount of 39% by weight to 47% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 5 in an amount of 10% by weight to 16% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 7 in an amount of 3% by weight to 9% by weight of the liquid crystal layer;
wherein the liquid crystal layer is configured to operate at a temperature of 40° C.±10%;
wherein Chemical Formulas 1, 2, 3, 4, 5, and 7 are as follows:
wherein, in Chemical Formulas 1, 2, 3, 4, 5, and 7, R and R′ are each independently an alkyl or an alkoxy group having 1 to 7 carbons.

### Claim 7 (depends on 6)

The liquid crystal display device of claim 6, wherein the liquid crystal layer has a nematic isotropic transition temperature of 110° C. or more.

### Claim 8 (depends on 6)

The liquid crystal display device of claim 6, wherein the liquid crystal layer has a rotational viscosity of 75 mPa·S.

### Claim 9

A liquid crystal display device, comprising:
a first substrate;
an opposing second substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate, the liquid crystal layer consisting of:
liquid crystal molecules represented by Chemical Formula 1 in an amount of 7% by weight to 13% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 2 in an amount of 23% by weight to 29% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 3 in an amount of 1% by weight to 5% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 4 in an amount of 39% by weight to 47% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 5 in an amount of 10% by weight to 16% by weight of the liquid crystal layer;
liquid crystal molecules represented by Chemical Formula 7 in an amount of 3% by weight to 9% by weight of the liquid crystal layer;
wherein the liquid crystal layer has a nematic isotropic transition temperature of 110° C. or more,
wherein the liquid crystal layer has a rotational viscosity of 52 mPa·S to 75 mPa·S when operating at a temperature of 40° C. to 50° C. and comprises liquid crystal molecules having a negative dielectric anisotropy, and
wherein Chemical Formulas 1, 2, 3, 4, 5, and 7 are as follows:
wherein, in Chemical Formulas 1, 2, 3, 4, 5, and 7, R and R′ are each independently an alkyl or an alkoxy group having 1 to 7 carbons.