Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10768498-B2
Application number	US-201715583156-A
Country	US
Kind code	B2
Filing date	May 1, 2017
Priority date	May 9, 2014
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

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.

First claim

What is claimed is:

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.

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

3. 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.

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

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

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.

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

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

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.

Assignees

• Samsung Display Co Ltd

Inventors

• Rho Soon Joon
• Kim Kyungmin
• Kim Jin-Lak
• Jang Hyelim

Classifications

• C09K19/02 Primary

  characterised by optical, electrical or physical properties of the components, in general · CPC title

• G02F1/13712

  the liquid crystal having negative dielectric anisotropy · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K19/12

  at least two benzene rings directly linked, e.g. biphenyls · CPC title

• C09K19/3003

  Compounds containing at least two rings in which the different rings are directly linked (covalent bond) · CPC title