Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9989815-B2
Application number	US-201615005421-A
Country	US
Kind code	B2
Filing date	Jan 25, 2016
Priority date	Aug 24, 2015
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A liquid crystal display device includes an insulating substrate, a data line disposed on the insulating substrate and extended in a first direction, a plurality of pixel electrodes which is disposed on the insulating substrate and in which a slit pattern is defined, a common electrode facing the pixel electrodes, and a liquid crystal layer interposed between the pixel electrodes and the common electrode, where each of the pixel electrodes includes an edge electrode portion and a plurality of branch electrode portions protruding in a direction toward a central portion of the pixel electrode from the edge electrode portion, and at least a portion of the edge electrode portion overlaps the data line.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
an insulating substrate;
a data line disposed on the insulating substrate and extended in a first direction;
a plurality of pixel electrodes which is disposed on the insulating substrate and in which a slit pattern is defined;
a common electrode facing the plurality of pixel electrodes, and
a liquid crystal layer interposed between the plurality of pixel electrodes and the common electrode,
wherein each of the plurality of pixel electrodes includes an edge electrode portion and a plurality of branch electrode portions protruding in a direction toward a central portion of the pixel electrode from the edge electrode portion,
at least a portion of the edge electrode portion overlaps the data line,
wherein
a region overlapping the pixel electrode defines a pixel region,
the pixel region includes a plurality of different domains in which directivities of the plurality of branch electrode portions are different from one another,
the plurality of domains includes a first domain, a second domain adjacent to the first domain in the first direction, and a third domain adjacent to the first domain in a second direction intersecting the first direction, and
a minimum distance between an end portion of a branch electrode portion overlapping the first domain and protruding toward the second domain among the plurality of branch electrode portions and an end portion of a branch electrode portion overlapping the second domain and protruding toward the first domain among the plurality of branch electrode portions is smaller than a minimum distance between an end portion of a branch electrode portion overlapping the first domain and protruding toward the third domain among the plurality of branch electrode portions and an end portion of a branch electrode portion overlapping the third domain and protruding toward the first domain among the plurality of branch electrode portions.

2. The liquid crystal display device of claim 1 , wherein the plurality of pixel electrodes include a first pixel electrode and a second pixel electrode disposed to be adjacent to the first pixel electrode in a second direction intersecting the first direction, and a distance between the first electrode and the second electrode is equal to or greater than about 5 micrometers and equal to or less than about 10 micrometers.

3. The liquid crystal display device of claim 1 , wherein the minimum distance between the end portion of the branch electrode portion overlapping the first domain and protruding toward the second domain and the end portion of the branch electrode portion overlapping the second domain and protruding toward the first domain is equal to or greater than 2.5 micrometers and equal to or less than 3.5 micrometers.

4. The liquid crystal display device of claim 3 , wherein the minimum distance between the end portion of the branch electrode portion overlapping the first domain and protruding toward the third domain and the end portion of the branch electrode portion overlapping the third domain and protruding toward the first domain is equal to or greater than 4.5 micrometers and equal to or less than 5.5 micrometers.

5. The liquid crystal display device of claim 1 , further comprising:
a sustain electrode line disposed between the insulating substrate and the pixel electrode and including at least a portion thereof overlapping the edge electrode portion of the pixel electrode.

6. The liquid crystal display device of claim 5 , wherein the at least a portion of the sustain electrode line overlaps the data line.

7. The liquid crystal display device of claim 1 , further comprising:
a light shielding member disposed in a region overlapping at least a portion of the data line and the at least a portion of the edge electrode portion of the pixel electrode.

8. The liquid crystal display device of claim 1 , further comprising:
a first alignment layer disposed between the pixel electrode and the liquid crystal layer;
a second alignment layer disposed between the common electrode and the liquid crystal layer;
a first photo-curing layer disposed between the first alignment layer and the liquid crystal layer; and
a second photo-curing layer disposed between the second alignment layer and the liquid crystal layer,
wherein the first photo-curing layer and the second photo-curing layer are provided through polymerization of reactive mesogen.

9. A liquid crystal display device comprising:
an insulating substrate;
a data line disposed on the insulating substrate and extended in a first direction;
a plurality of pixel electrodes which is disposed on the insulating substrate and in which a slit pattern is defined;
a common electrode facing the plurality of pixel electrodes, and
a liquid crystal layer interposed between the plurality of pixel electrodes and the common electrode and including liquid crystal molecules,
wherein a central slit portion including a horizontal slit portion and a vertical slit portion and a plurality of fine slit portions extended in a direction inclined from the central slit portion are defined in each of the plurality of pixel electrodes,
the vertical slit portion extended in the first direction,
a width of the horizontal slit portion is narrower than that of the vertical slit portion,
a region overlapping the pixel electrode defines a pixel region,
the pixel region includes a plurality of different domains in which directivities of the liquid crystal molecules are different from one another, and
in a state in which an electric field is generated between the pixel electrode and the common electrode, the liquid crystal molecules within one of the plurality of domains are disposed in parallel with an extension direction of the fine slit portion and are aligned in a direction toward a circumferential portion of the pixel electrode from a central portion thereof.

10. The liquid crystal display device of claim 9 , wherein the width of the horizontal slit portion is equal to or greater than 2.5 micrometers and equal to or less than 3.5 micrometers.

11. The liquid crystal display device of claim 10 , wherein the width of the vertical slit portion is equal to or greater than 4.5 micrometers and equal to or less than 5.5 micrometers.

12. The liquid crystal display device of claim 9 , wherein the pixel electrode further includes an edge electrode portion disposed in the circumferential portion of the pixel electrode along an edge of the pixel electrode.

13. The liquid crystal display device of claim 12 , wherein the plurality of pixel electrodes include a first pixel electrode and a second pixel electrode disposed to be adjacent to the first pixel electrode in a second direction, and
a distance between the first electrode and the second electrode is equal to or greater than 5 micrometers and equal to or less than 10 micrometers.

14. The liquid crystal display device of claim 12 , further comprising:
at least a portion of the edge electrode portion overlaps the data line.

15. The liquid crystal display device of claim 14 , further comprising:
a sustain electrode line disposed between the insulating substrate and the pixel electrode and including at least a portion thereof overlapping the edge electrode portion of the pixel electrode.

16. The liquid crystal display device of claim 15 , wherein the at least a portion of the sustain electrode line overlaps the data line.

17. The liquid crystal display device of claim 14 , further comprising:
a light shielding member disposed in a region overlapping at least

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Kim Sang Gyun
• Park Heung Shik
• Kim Kyung Min
• Kim Hoon
• Shin Ki Chul

Classifications

• G02F1/133707 Primary

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

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/134345

  Subdivided pixels, e.g. for grey scale or redundancy · CPC title