Liquid crystal display

Patent metadata

Field	Value
Publication number	US-9594279-B2
Application number	US-201414188458-A
Country	US
Kind code	B2
Filing date	Feb 24, 2014
Priority date	Mar 6, 2013
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

Provided is a liquid crystal display, including: a first substrate; a pixel electrode disposed on the first substrate; a second substrate facing the first substrate; a common electrode disposed on the second substrate; and a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer including a plurality of liquid crystal molecules, in which the common electrode includes a cross-shaped cutout, the cross-shaped cutout overlapping the pixel electrode and dividing the pixel electrode into a plurality of subregions, and the pixel electrode includes a direction controller extend in a direction parallel to a line connecting an intersecting point of the cross-shaped cutout and a pixel corner edge opposing the intersecting point.

First claim

What is claimed is:

1. A liquid crystal display, comprising:
a first substrate;
a pixel electrode disposed on the first substrate;
a second substrate facing the first substrate;
a common electrode disposed on the second substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer including a plurality of liquid crystal molecules,
wherein the common electrode includes a cross-shaped cutout, the cross-shaped cutout overlapping the pixel electrode and dividing the pixel electrode into a plurality of subregions,
wherein the pixel electrode includes a direction controller extending in a direction parallel to a line connecting an intersecting point of the cross-shaped cutout and a pixel corner edge opposing the intersecting point,
wherein each of the plurality of subregions is divided into nine small regions by dividing a width of each of the subregions into three equal parts and dividing a length of each of the subregions into three equal parts, and
wherein the direction controller is disposed exclusively in a center small region of the nine small regions.

2. The liquid crystal display of claim 1 , wherein:
the direction controller is a cutout formed in the pixel electrode, or a concave portion or a convex portion of the surface of the pixel electrode.

3. The liquid crystal display of claim 2 , wherein:
the pixel electrode has a cutout formed along one of edges of the pixel electrode.

4. The liquid crystal display of claim 2 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to have pretilts in a direction parallel to the line connecting the intersecting point of the cross-shaped cutout and the pixel corner edge opposing the intersecting point.

5. The liquid crystal display of claim 2 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to be substantially vertical to the surfaces of the first substrate and the second substrate when an electric field is not applied in the liquid crystal layer.

6. The liquid crystal display of claim 1 , wherein:
the pixel electrode has a cutout formed along an edge of the pixel electrode.

7. The liquid crystal display of claim 1 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to have pretilts in a direction parallel to the line connecting the intersecting point of the cross-shaped cutout and the pixel corner edge opposing the intersecting point.

8. The liquid crystal display of claim 1 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to be substantially vertical to the surfaces of the first substrate and the second substrate when an electric field is not applied in the liquid crystal layer.

9. A liquid crystal display, comprising:
a first substrate;
a pixel electrode disposed on the first substrate;
a second substrate facing the first substrate;
a common electrode disposed on the second substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer including a plurality of liquid crystal molecules,
wherein the common electrode includes a cross-shaped cutout, the cross-shaped cutout overlapping the pixel electrode and dividing the pixel electrode into a plurality of subregions,
wherein the pixel electrode includes a direction controller extending in a direction parallel to a line connecting an intersecting point of the cross-shaped cutout and a pixel corner edge opposing the intersecting point,
wherein each of the plurality of subregions is divided into four small regions by dividing a width of each of the subregions into two equal parts and dividing a length of each of the subregions into two equal parts, and
wherein the direction controller is disposed exclusively in a small region of the four small regions which is disposed farthermost from the intersecting point.

10. The liquid crystal display of claim 9 , wherein:
the pixel electrode has a cutout formed along one of edges of the pixel electrode, and
wherein the direction controller extends from the cutout of the pixel electrode, the direction controller being a plurality of minute cutouts.

11. The liquid crystal display of claim 9 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to have pretilts in a direction parallel to the line connecting the intersecting point of the cross-shaped cutout and the pixel corner edge opposing the intersecting point.

12. The liquid crystal display of claim 9 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to be substantially vertical to the surfaces of the first substrate and the second substrate when an electric field is not applied in the liquid crystal layer.

13. A liquid crystal display, comprising:
a first substrate;
a pixel electrode disposed on the first substrate;
a second substrate facing the first substrate;
a common electrode disposed on the second substrate; and
a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer including a plurality of liquid crystal molecules,
wherein the pixel electrode has a cross-shaped first cutout, the pixel electrode being divided into a plurality of subregions by the cross-shaped cutout, and
wherein the common electrode includes a second cutout including a diagonal portion extending in a direction parallel to a line connecting two adjacent end points of the cross-shaped first cutout
wherein the pixel electrode has a third cutout, the third cutout being formed along one of the edges of the pixel electrode, and
wherein the second cutout is disposed between the cross-shaped first cutout and the third cutout.

14. The liquid crystal display of claim 13 , wherein:
the second cutout further includes a straight-line portion extending to be parallel to an edge of the pixel electrode and protruding from the diagonal portion.

15. The liquid crystal display of claim 14 , wherein:
the straight-line portion includes a horizontal portion and a vertical portion, and
lengths of the horizontal portion and the vertical portion are substantially the same as or different from each other.

16. The liquid crystal display of claim 15 , wherein:
the third cutout is formed in a substantially quadrangular ring shape along the edge of the pixel electrode and is disconnected around a portion corresponding to an end of the cross-shaped first cutout of the pixel electrode.

17. The liquid crystal display of claim 16 , wherein:
the third cutout of the pixel electrode is not overlapped with the second cutout of the common electrode.

18. The liquid crystal display of claim 14 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to have pretilts parallel to a line connecting the intersecting point of the cross-shaped first cutout and a pixel corner edge opposing the intersecting point.

19. The liquid crystal display of claim 14 , wherein:
the liquid crystal molecules of the liquid crystal layer are aligned to be substantially vertical to the surfaces of the first substrate and the second substrate when an electric field is not applied in the liquid crystal layer.

20. The liquid crystal display of claim 13 , wherein:
the pixel electrode further has a third cutout formed along one of the edges of the pixel electrode.

21. The liquid crystal display of claim 20 , wherein:
the third cutout of the pixel electrode is

Assignees

• Samsung Display Co Ltd

Inventors

• Yoon Hyung Guen
• Yun Sung-Jae
• Kwon Oh Jeong
• Park Jae Hong
• Kim Jin Won
• Park Kyung Hae
• Shin Dong-Chul

Classifications

• G02F1/1393

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133707 Primary

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

• G02F1/133753

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

• G02F1/134336 Primary

  Matrix · CPC title