Liquid crystal display

Patent metadata

Field	Value
Publication number	US-9547203-B2
Application number	US-201514695023-A
Country	US
Kind code	B2
Filing date	Apr 23, 2015
Priority date	May 2, 2014
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A liquid crystal display including a first substrate, a pixel electrode on the first substrate and including a first subpixel electrode and a second subpixel electrode separated from the first subpixel electrode, a second substrate facing the first substrate, a common electrode on the second substrate, and a liquid crystal layer between the first substrate and the second substrate, wherein the first subpixel electrode includes a first plate-shaped portion and first branch electrodes extending from the first plate-shaped portion, wherein the second subpixel electrode includes a second plate-shaped portion configured to enclose surroundings of the first branch electrode and second branch electrodes extending from the second plate-shaped portion, and wherein a difference between a first voltage applied to the first subpixel electrode and a common voltage applied to the common electrode is larger than a difference between a second voltage applied to the second subpixel electrode and the common voltage.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate;
a pixel electrode on the first substrate and comprising a first subpixel electrode and a second subpixel electrode separated from the first subpixel electrode;
a second substrate facing the first substrate;
a common electrode on the second substrate; and
a liquid crystal layer between the first substrate and the second substrate,
wherein the first subpixel electrode comprises a first plate-shaped portion and a plurality of first branch electrodes extending from the first plate-shaped portion,
wherein the second subpixel electrode comprises a second plate-shaped portion configured to enclose surroundings of the first branch electrode and a plurality of second branch electrodes extending from the second plate-shaped portion, and
wherein a difference between a first voltage applied to the first subpixel electrode and a common voltage applied to the common electrode is larger than a difference between a second voltage applied to the second subpixel electrode and the common voltage.

2. The liquid crystal display of claim 1 , further comprising
an insulating layer between the first subpixel electrode and the second subpixel electrode,
wherein the first subpixel electrode is on the insulating layer and the second subpixel electrode is under the insulating layer, and
wherein an edge of the first branch electrode overlaps an edge of the second plate-shaped portion.

3. The liquid crystal display of claim 2 ,
wherein the common electrode has a cross-shaped cutout, and
wherein the first plate-shaped portion of the first subpixel electrode overlaps a center portion of the cross-shaped cutout.

4. The liquid crystal display of claim 3 ,
wherein the first plate-shaped portion of the first subpixel electrode has a planar shape of a rhombus, and
wherein the second plate-shaped portion of the second subpixel electrode has a planar shape including a plurality of trapezoid shapes.

5. The liquid crystal display of claim 4 ,
wherein the plurality of first branch electrodes of the first subpixel electrode comprises a first minute branch, a second minute branch, a third minute branch, and a fourth minute branch extending in different directions, and
wherein the plurality of second branch electrodes of the second subpixel electrode comprise a fifth minute branch, a sixth minute branch, a seventh minute branch, and an eighth minute branch extending in different directions.

6. The liquid crystal display of claim 1 , further comprising:
an insulating layer under the first subpixel electrode and the second subpixel electrode; and
a third electrode under the insulating layer,
wherein the third electrode overlaps, and is between, the first branch electrode of the first subpixel electrode and the second plate-shaped portion of the second subpixel electrode.

7. The liquid crystal display of claim 6 , wherein
the third electrode is configured to receive a voltage of substantially the same magnitude as the first subpixel electrode.

8. The liquid crystal display of claim 7 ,
wherein the common electrode has a cross-shaped cutout, and
wherein the first plate-shaped portion of the first subpixel electrode overlaps a center portion of the cross-shaped cutout.

9. The liquid crystal display of claim 8 ,
wherein the first plate-shaped portion of the first subpixel electrode has a planar shape of a rhombus, and
wherein the second plate-shaped portion of the second subpixel electrode has a planar shape including a plurality of trapezoid shapes.

10. The liquid crystal display of claim 9 ,
wherein the plurality of first branch electrodes of the first subpixel electrode comprise a first minute branch, a second minute branch, a third minute branch, and a fourth minute branch extending in different directions, and
wherein the plurality of second branch electrodes of the second subpixel electrode comprise a fifth minute branch, a sixth minute branch, a seventh minute branch, and an eighth minute branch extending in different directions.

11. The liquid crystal display of claim 1 ,
wherein the common electrode has a cross-shaped cutout, and
wherein the first plate-shaped portion of the first subpixel electrode overlaps a center portion of the cross-shaped cutout.

12. The liquid crystal display of claim 11 ,
wherein the first plate-shaped portion of the first subpixel electrode has a planar shape of a rhombus, and
wherein the second plate-shaped portion of the second subpixel electrode has a planar shape including a plurality of trapezoid shapes.

13. The liquid crystal display of claim 12 ,
wherein the plurality of first branch electrodes of the first subpixel electrode comprise a first minute branch, a second minute branch, a third minute branch, and a fourth minute branch extending in different directions; and
wherein the plurality of second branch electrodes of the second subpixel electrode comprise a fifth minute branch, a sixth minute branch, a seventh minute branch, and an eighth minute branch extending in different directions.

14. The liquid crystal display of claim 13 ,
wherein a distance between the first subpixel electrode and the second subpixel electrode, as measured along a direction substantially parallel with an extending direction of any one of the plurality of first branch electrodes and the plurality of second branch electrodes, is less than or equal to about 4 μm, and
wherein a ratio of the voltage applied to the second subpixel electrode to the voltage applied to the first subpixel electrode is less than or equal to about 0.83.

15. The liquid crystal display of claim 13 ,
wherein a distance between the first subpixel electrode and the second subpixel electrode, as measured along a direction substantially parallel with an extending direction of any one of the plurality of first branch electrodes and the plurality of second branch electrodes, is greater than about 4 μm and less than or equal to about 4.5 μm, and
wherein a ratio of the voltage applied to the second subpixel electrode to the voltage applied to the first subpixel electrode is less than or equal to about 0.75.

16. The liquid crystal display of claim 13 ,
wherein a distance between the first subpixel electrode and the second subpixel electrode, as measured along a direction substantially parallel with an extending direction of any one of the plurality of first branch electrodes and the plurality of second branch electrodes is greater than or equal to about 5 μm, and
wherein a ratio of the voltage applied to the second subpixel electrode to the voltage applied to the first subpixel electrode is less than or equal to about 0.7.

17. The liquid crystal display of claim 13 , wherein
one-half of an entire width of the first plate-shaped portion of the first subpixel electrode, as measured along a direction substantially parallel with an extending direction of any one of the plurality of first branch electrodes and the plurality of second branch electrodes, is less than or equal to about 25 μm.

18. The liquid crystal display of claim 17 , wherein
a width of the second plate-shaped portion of the second subpixel electrode, as measured along a direction substantially parallel with an extending direction of any one of the plurality of first branch electrodes and the plurality of second branch electrodes, is less than or equal to about 25 μm.

19. The liquid crystal display of claim 17 , wherein
lengths of the plurality of first branch electrodes and the plurality of secon

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Se Hyun
• Kim Ka Eun
• Shin Ki Chul
• Oh Ho Kil
• Chang Hak Sun

Classifications

• G02F1/133707

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

• G02F2001/134345

  Physics · mapped topic

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F2001/134354

  Physics · mapped topic