Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9291856-B2
Application number	US-201414273216-A
Country	US
Kind code	B2
Filing date	May 8, 2014
Priority date	Sep 12, 2013
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A liquid crystal display panel includes a first substrate, a second substrate that faces 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 that have negative dielectric anisotropy and a nematic-isotropic phase transition temperature (Tni) of about 110° C. or more.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a liquid crystal display panel, wherein the liquid crystal display panel comprises:
a first substrate;
a second substrate that faces the first substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate,
wherein the liquid crystal layer comprises liquid crystal molecules that have a negative dielectric anisotropy and a nematic-isotropic phase transition temperature (Tni) of 110° C. or more,
wherein the liquid crystal layer includes a liquid crystal molecule represented by a following chemical formula:

wherein R and R′ each represents an alkyl group having 1 to 7 carbon atoms,
wherein the liquid crystal layer excludes alkenyl-based liquid crystal molecules.

2. The liquid crystal display device of claim 1 , further comprising a backlight unit configured to provide light to the liquid crystal display panel, wherein the backlight unit is configured to provide a luminance of 1,500 cd/m 2 or more.

3. The liquid crystal display device of claim 1 , wherein a length to width ratio of each of the liquid crystal molecules is 6.6 or more.

4. The liquid crystal display device of claim 3 , wherein the liquid crystal molecules have a following structure:

5. The liquid crystal display device of claim 1 , wherein the liquid crystal layer has a rotational viscosity of 190 mPa·s or more at 20° C.

6. The liquid crystal display device of claim 5 , wherein the liquid crystal layer has a splay elastic modulus of 17 or more, and a bending elastic modulus of 19 or more.

7. The liquid crystal display device of claim 1 , wherein the liquid crystal layer is a vertical alignment mode liquid crystal layer that is configured to be driven at a temperature of from 40 to 60° C.

8. The liquid crystal display device of claim 1 , wherein the first substrate includes a first electrode,
the second substrate includes a second electrode configured to form an electric field together with the first electrode,
wherein the first electrode includes a plurality of first domain dividers configured to divide the first electrode into a plurality of domains, and the second electrode includes a plurality of second domain dividers configured to divide the second electrode into a plurality of domains.

9. The liquid crystal display device of claim 8 , wherein the first domain dividers and the second domain dividers alternate with each other when viewed from a plan view.

Assignees

• Samsung Display Co Ltd

Inventors

• Rho Soon Joon
• Kim Kyungmin
• Kim Jin-Lak
• Park Joon-Hyung
• Jang Hyelim
• Tak Kyungseon

Classifications

• G02F2001/133742

  Physics · mapped topic

• G02F2001/13712

  Physics · mapped topic

• C09K19/3003

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

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• G02F1/133707 Primary

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title