Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9417488-B2
Application number	US-201514634458-A
Country	US
Kind code	B2
Filing date	Feb 27, 2015
Priority date	Oct 14, 2014
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A liquid crystal display includes: a flexible first substrate; a pixel electrode positioned on the first substrate and including an outer stem with a quadrangular shape, a crossed-shape stem including a transverse stem positioned inside the outer stem and a longitudinal stem crossing the transverse stem, and a plurality of minute branches extending from the outer stem and the crossed-shape stem; a flexible second substrate facing the first substrate; a common electrode positioned on the second substrate; and a liquid crystal layer including liquid crystal molecules interposed between the first substrate and the second substrate. An angle formed by minute branches of one sub-region of the pixel electrode positioned at second, third and fourth zones and the transverse stem is smaller than an angle formed by minute branches of three other sub-regions of the pixel electrode positioned at the second, third, and fourth zones and the transverse stem.

First claim

What is claimed is:

1. A liquid crystal display, comprising:
a flexible first substrate;
a pixel electrode positioned on the first substrate and including an outer stem with a quadrangular shape, a crossed-shape stem including a transverse stem positioned inside the outer stem and a longitudinal stem crossing the transverse stem, and a plurality of minute branches extending from the outer stem and the crossed-shape stem;
a flexible second substrate facing the first substrate;
a common electrode positioned on the second substrate; and
a liquid crystal layer including liquid crystal molecules interposed between the first substrate and the second substrate;
wherein the liquid crystal display includes a first zone positioned at a center thereof, a second zone positioned at a right side of the first zone, a third zone positioned at a right side of the second zone, and a fourth zone positioned at a right side of the third zone;
wherein the pixel electrode includes a first sub-region positioned at a leftmost side, a second sub-region positioned at a right side of the first sub-region, a third sub-region positioned at a right side of the second sub-region, and a fourth sub-region positioned at a right side of the third sub-region; and
wherein an angle formed by the minute branches of the third sub-region of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem is smaller than an angle formed by the minute branches of the first, the second, and the fourth sub-regions of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem.

2. The liquid crystal display of claim 1 , wherein the angle formed by the minute branches of the first sub-region of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem is more than 35 degrees and less than 45 degrees, the angle formed by the minute branches of the second sub-region of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem is more than 45 degrees and less than 80 degrees, the angle formed by the minute branches of the third sub-region of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem is more than 10 degrees and less than 40 degrees, and the angle formed by the minute branches of the fourth sub-region of the pixel electrode positioned at the second, the third, and the fourth zones and the transverse stem is more than 45 degrees and less than 70 degrees.

3. The liquid crystal display of claim 2 , wherein a width of the second sub-region and the third sub-region is widened from the second zone to the fourth zone.

4. The liquid crystal display of claim 3 , wherein the width of the second sub-region is the same as the width of the third sub-region.

5. The liquid crystal display of claim 3 , wherein:
the width of the second sub-region and the third sub-region in the third zone is two times the width of the second sub-region and the third sub-region in the second zone, and
the width of the second sub-region and the third sub-region in the fourth zone is three times the width of the second sub-region and the third sub-region in the second zone.

6. The liquid crystal display of claim 3 , wherein the width of the first sub-region and the fourth sub-region is decreased from the second zone to the fourth zone.

7. The liquid crystal display of claim 6 , wherein the width of the first sub-region is the same as the width of the fourth sub-region.

8. The liquid crystal display of claim 3 , wherein a width from the first zone to the fourth zone is constant.

9. The liquid crystal display of claim 3 , wherein the angle formed by the minute branches of the first, the second, the third, and the fourth sub-regions of the pixel electrode positioned at the first zone and the transverse stem is constant.

10. The liquid crystal display of claim 9 , wherein the angle formed by the minute branches of the pixel electrode positioned at the first zone and the transverse stem is more than 40 degrees and less than 45 degrees.

11. The liquid crystal display of claim 3 , wherein the longitudinal stem is positioned at a boundary between the second sub-region and the third sub-region.

12. The liquid crystal display of claim 11 , wherein the boundary between the first sub-region and the second sub-region and the boundary between the third sub-region and the fourth sub-region are parallel to the longitudinal stem.

13. The liquid crystal display of claim 3 , wherein the first substrate and the second substrate are curved in a first direction.

14. The liquid crystal display of claim 13 , wherein the first direction is parallel to the transverse stem.

15. The liquid crystal display of claim 14 , wherein the first substrate and the second substrate have a constant curvature.

16. The liquid crystal display of claim 3 , wherein a boundary between the first zone and the second zone, a boundary between the second zone and the third zone, and a boundary between the third zone and the fourth zone are parallel to the longitudinal stem.

17. The liquid crystal display of claim 3 , wherein the first substrate further includes a fifth zone positioned at the left side of the first zone, a sixth zone positioned at the left side of the fifth zone, and a seventh zone positioned at the left side of the sixth zone.

18. The liquid crystal display of claim 17 , wherein:
a shape of minute branches of the pixel electrode positioned at the fifth zone is symmetrical to a shape of the minute branches of the pixel electrode positioned at the second zone;
a shape of minute branches of the pixel electrode positioned at the sixth zone is symmetrical to a shape of the minute branches of the pixel electrode positioned at the third zone; and
a shape of minute branches of the pixel electrode positioned at the seventh zone is symmetrical to a shape of the minute branches of the pixel electrode positioned at the fourth zone.

19. The liquid crystal display of claim 3 , wherein the liquid crystal layer includes liquid crystal molecules and a reactive mesogen.

20. The liquid crystal display of claim 3 , further comprising:
a first alignment layer positioned on the first substrate; and
a second alignment layer positioned on the second substrate;
wherein the first alignment layer and the second alignment layer are made of an alignment material including a reactive mesogen.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jin Won
• Kwon Oh Jeong
• Lee Hyeok Jin
• Shin Ki Chul

Classifications

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/133711

  by organic films, e.g. polymeric films · CPC title

• G02F2001/134345

  Physics · mapped topic

• G02F2001/133726

  Physics · mapped topic

• G02F1/133753

  with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle · CPC title