Liquid crystal display

Patent metadata

Field	Value
Publication number	US-9846331-B2
Application number	US-201615164585-A
Country	US
Kind code	B2
Filing date	May 25, 2016
Priority date	Jun 10, 2015
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A liquid crystal display includes a first panel including a first electrode, which includes side electrodes in edge areas of a pixel, a central electrode connected to the side electrodes and disposed in a central area of the pixel, and fine branches, some of which are connected to the side electrode, a second panel in which a cutout, which corresponds to the first electrode and divides the fine branches, the central electrode and the side electrode into domains is defined, and which includes a second electrode, which is separated by the cutout and corresponds to each of the domains, where second slit patterns, which are provided by partially cutting out ends of the fine branches, separate the side electrodes and the fine branches from each other, and extend in parallel to a longitudinal direction of the side electrodes are defined in the first panel.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first panel including a first electrode, which comprises side electrodes which are disposed in edge areas of a pixel, a central electrode which is connected to the side electrodes and is disposed in a central area of the pixel, and fine branches, some of which are connected to the side electrodes;
a second panel in which a cutout, which corresponds to the first electrode and divides the fine branches, the central electrode and the side electrodes into a plurality of domains, is defined and which includes a second electrode, which is separated by the cutout and corresponds to each of the plurality of domains; and
a liquid crystal layer disposed between the first and second panels and including liquid crystal molecules,
wherein the fine branches are disposed in each of the plurality of domains and include a plurality of branch electrodes, and first slit patterns, which are provided by removing parts of the pixel between the plurality of branch electrodes and separate the plurality of branch electrodes from one another are defined in the plurality of branch electrodes, and
wherein second slit patterns, which are provided by partially cutting out ends of the fine branches, separate the side electrodes and the fine branches from each other, and extend in parallel to a longitudinal direction of the side electrodes, are defined in the first panel.

2. The liquid crystal display of claim 1 , wherein the plurality of branch electrodes and the first slit patterns in one of the plurality of domains are asymmetrical to a plurality of branch electrodes and first slit patterns in another one of the plurality of domains.

3. The liquid crystal display of claim 1 , wherein the side electrodes are disposed on at least one of left, right, top and bottom sides of the pixel, and the second slit patterns, which separate the side electrodes and the fine branches from each other, are disposed in at least one of the plurality of domains.

4. The liquid crystal display of claim 1 , wherein a width of the side electrodes and the second slit patterns is in the range of about 7 micrometers to about 9 micrometers.

5. The liquid crystal display of claim 1 , wherein a distance between the side electrodes and the plurality of branch electrodes is in the range of about 3 micrometers to about 5 micrometers.

6. The liquid crystal display of claim 1 , wherein a width of the second silt patterns is in the range of about 3 micrometers to about 5 micrometers.

7. The liquid crystal display of claim 1 , wherein the plurality of branch electrodes and the first slit patterns are disposed at a pitch of about 6 micrometers to about 10 micrometers.

8. The liquid crystal display of claim 1 , wherein a length of the fine branches extend from one side of the central electrode to one side of the pixel is about 30 micrometers or less.

9. The liquid crystal display of claim 1 , wherein the second slit patterns are disposed between every other pair of branch electrodes.

10. The liquid crystal display of claim 1 , wherein the central electrode is provided in one of a polygonal shape, including the shapes of a cross, a rhombus, a rectangle, and an octagon, a circular shape and a combination thereof.

11. The liquid crystal display of claim 1 , wherein the plurality of branch electrodes and the first slit patterns in one of the plurality of domains are arranged in an alternate manner in a pair of adjacent domains of the plurality of domains.

12. The liquid crystal display of claim 1 , wherein a horizontal cutout portion, which horizontally divides the plurality of domains across the central electrode, and a vertical cutout portion, which intersects the horizontal cutout portion and vertically divides the plurality of domains across the central electrode are defined in the second electrode.

13. The liquid crystal display of claim 12 , wherein the first electrode further includes a connecting electrode which is disposed between the central electrode and the side electrodes and in an area corresponding to the cutout.

14. The liquid crystal display of claim 11 , wherein a width of the cutout is in the range of about 2 micrometers to about 5 micrometers.

15. The liquid crystal display of claim 1 , wherein the first electrode further includes first areas in which parts of the fine branches adjacent to the central electrode are located and second areas which are apart from the central electrode and in which at least one of the side electrodes is disposed at the ends of at least one of the fine branches, and the second slit patterns are disposed near at least one of the second areas and rotate liquid crystal molecules in the second areas in a direction similar to a direction of an average azimuth angle of liquid crystal molecules in the first areas.

16. The liquid crystal display of claim 14 , wherein a direction in which the plurality of branch electrodes extend is the same as a direction of an average azimuth angle of the liquid crystal molecules.

17. The liquid crystal display of claim 1 , further comprising:
first and second polarizing plates, which are disposed on the first and second panels, respectively,
wherein a direction in which the plurality of branch electrodes extend is in a range of angles of about 30 degrees to about 60 degrees relative to a polarization axis of the first and second polarizing plates.

18. The liquid crystal display of claim 1 , wherein the second slit patterns are arranged in an alternate manner in a pair of adjacent pixels.

19. The liquid crystal display of claim 1 , wherein a width of the plurality of branch electrodes is the same as a width of the first silt patterns.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Se Hyun
• Shin Cheol
• Chang Hak Sun
• Shin Ki Chul

Classifications

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133707

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

• G02F1/133753 Primary

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

• G02F2001/133757

  Physics · mapped topic

• G02F1/133757

  with different alignment orientations · CPC title