Liquid crystal display

Patent metadata

Field	Value
Publication number	US-10203565-B2
Application number	US-201615059460-A
Country	US
Kind code	B2
Filing date	Mar 3, 2016
Priority date	Jun 24, 2015
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

Liquid crystal display includes a first substrate which includes a pixel electrode disposed in each pixel, a second substrate which faces the first substrate and includes a common electrode and an insulating layer, and a liquid crystal layer which is disposed between the first substrate and the second substrate, where the common electrode includes a first common electrode which is disposed on the whole surface defining the second substrate and a second common electrode which is disposed on the first common electrode with the insulating layer interposed therebetween and includes an opening defined in each pixel, and each pixel includes a first region in which the pixel electrode and the first common electrode face each other through the opening and a second region in which the pixel electrode and the second common electrode face each other.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate which comprises a pixel electrode disposed in each pixel;
a second substrate which faces the first substrate and comprises a common electrode and an insulating layer; and
a liquid crystal layer which is disposed between the first substrate and the second substrate,
wherein the common electrode comprises a first common electrode which is disposed on a whole surface defining the second substrate and a second common electrode which is disposed on the first common electrode with the insulating layer interposed therebetween and comprises an opening defined in each pixel, and each pixel comprises a first region in which the pixel electrode and the first common electrode face each other through the opening and a second region in which the pixel electrode and the second common electrode face each other,
wherein the pixel electrode is divided into a plurality of domains, wherein a portion of the opening which corresponds to each of the plurality of domains is symmetrical to another portion of the opening which corresponds to an adjacent domain.

2. The liquid crystal display of claim 1 , wherein the pixel electrode comprises a stem part which forms a boundary between the plurality of domains and a plurality of branches which extend in different directions in two different domains of the plurality of domains.

3. The liquid crystal display of claim 2 , wherein a boundary line between the second common electrode and the opening extends in a direction perpendicular to a direction in which the plurality of branches extends, and the direction in which the boundary line between the second common electrode and the opening extends is changed at the stem part.

4. The liquid crystal display of claim 2 , wherein the opening is defined in the pixel electrode and has a hexagonal shape.

5. A display device comprising:
a first substrate;
a second substrate which faces the first substrate; and
a liquid crystal layer which is disposed between the first substrate and the second substrate,
wherein the first substrate comprises a gate line which is disposed on a first insulating substrate and extends along a first direction, a data line which intersects the gate line, is insulated from the gate line and extends along a second direction and a pixel electrode which receives a voltage from the data line, and the second substrate comprises a first common electrode which is disposed on a second insulating substrate, an overcoating layer which is disposed on the first common electrode and a second common electrode which is disposed on the overcoating layer and provided around an opening, and
wherein the pixel electrode overlaps both the first and second common electrodes,
wherein the display device is divided into a plurality of unit pixel regions, each defined by the gate line and the data line intersecting each other, wherein the second common electrode occupies a predetermined area of each of the plurality of unit pixel regions,
wherein a pattern of the second common electrode is repeated to correspond to each of the plurality of unit pixel regions, and
wherein the pixel electrode disposed in each of the plurality of unit pixel regions comprises:
a plate part;
a stem part which protrudes from the plate part and extends parallel to the gate line or the data line so as to divide the unit pixel region into a plurality of domains; and
branches which protrude from the plate part or the stem part, extend in different directions in different domains of the plurality of domains, and are separated from each other.

6. The display device of claim 5 , wherein a portion of the second common electrode which corresponds to the plate part is removed.

7. The display device of claim 6 , wherein the first common electrode has an opening defined at a location corresponding to the plate part, wherein the opening is parallel to the gate line or the data line.

8. The display device of claim 6 , wherein each of the plurality of unit pixel regions is divided into a first region in which the second common electrode is not disposed and a second region in which the second common electrode is disposed, wherein a boundary between the first region and the second region is perpendicular to a direction in which the branches extend.

9. The display device of claim 8 , wherein the boundary between the first region and the second region has a hexagonal shape in each of the plurality of unit pixel regions, and at least one of boundary lines between the first region and the second region is parallel to the data line.

10. The display device of claim 8 , wherein an electric field generated in the first region is greater than an electric field generated in the second region.

11. The display device of claim 8 , wherein boundary lines between the first region and the second region are parallel to the gate line between two adjacent unit pixel regions of the plurality of unit pixel regions.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Kyeong Jong
• Kim Hoon
• Park Heung Shik
• Shin Ki Chul

Classifications

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/139

  based on orientation effects in which the liquid crystal remains transparent · CPC title

• G02F2001/134318

  Physics · mapped topic

• G02F1/134318

  having a patterned common electrode · CPC title