Liquid crystal display device comprising a pixel electrode having a gap disposed between a fine branch portion and an outer portion of the pixel electrode

Patent metadata

Field	Value
Publication number	US-10031379-B2
Application number	US-201514986192-A
Country	US
Kind code	B2
Filing date	Dec 31, 2015
Priority date	Jan 5, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A liquid crystal display device includes: a first substrate; a pixel electrode formed on the first substrate; a second substrate corresponding to the first substrate; and a common electrode formed on the second substrate. The pixel electrode includes: a central electrode, an outer portion connected to the central electrode and extending along an edge of the pixel electrode; and a fine branch portion extending from a side of the central electrode and spaced apart from the outer portion, wherein a cross-shaped opening is formed in the common electrode.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a pixel electrode formed on the first substrate;
a second substrate corresponding to the first substrate; and
a common electrode formed on the second substrate,
wherein the pixel electrode includes:
a central electrode,
an outer portion connected to the central electrode and extending along an edge of the pixel electrode; and
a fine branch portion extending from a side of the central electrode and spaced apart from the outer portion,
wherein a gap is disposed between the fine branch portion and the outer portion,
wherein a cross-shaped opening is formed in the common electrode, and
wherein the outer portion is not connected to the edge of the fine branch portion.

2. The liquid crystal display device of claim 1 , wherein:
the central electrode has a rhombus shape, and
the central electrode is connected to the outer portion directly or via an extension of the central electrode.

3. The liquid crystal display device of claim 1 , wherein:
a width of the outer portion is from 1 μm to 4 μm.

4. The liquid crystal display device of claim 1 , wherein:
a gap distance between an edge of the outer portion and an edge of the fine branch portion is from 1 μm to 4 μm.

5. The liquid crystal display device of claim 1 , wherein:
a sum of a width of the outer portion and a distance between an edge of the outer portion and an edge of the fine branch portion is from 2 μm to 7.5 μm.

6. The liquid crystal display device of claim 1 , further comprising:
a gate line formed on the first substrate; and
an insulating layer formed on the gate line,
wherein the pixel electrode includes a first sub-pixel electrode formed in a pixel region on one side of the gate line, and a second sub-pixel electrode formed in a pixel region on an opposite side of the gate line.

7. The liquid crystal display device of claim 6 , wherein:
the first sub-pixel electrode and the second sub-pixel electrode are arranged to receive differing voltages.

8. The liquid crystal display device of claim 1 , wherein:
the common electrode includes a cross-shaped opening and a central opening formed at a center of the cross-shaped opening.

9. The liquid crystal display device of claim 1 , wherein:
the fine branch portion extends in a diagonal direction.

10. The liquid crystal display device of claim 9 , wherein:
the fine branch portion extends at an angle from 80 degrees to 100 degrees with respect to an edge of the central electrode.

11. A liquid crystal display device comprising:
a first substrate,
a pixel electrode formed on the first substrate,
a second substrate corresponding to the first substrate, and
a common electrode formed on the second substrate,
wherein the pixel electrode includes a cross-shaped stem portion, a plurality of fine branch portions extending from the stem portion in four diagonal directions, and
an outer portion having a rectangular shape, formed at an edge of the pixel electrode, and spaced apart from the fine branch portions,
wherein a gap is disposed between the fine branch portion and the outer portion, and
wherein the outer portion is not connected to the edge of the fine branch portion.

12. The liquid crystal display device of claim 11 , wherein:
the common electrode has no opening therein.

13. The liquid crystal display device of claim 11 , wherein:
a width of the outer portion is from 1 μm to 4 μm.

14. The liquid crystal display device of claim 11 , wherein:
a gap distance between an edge of the outer portion and an edge of the fine branch portion is from 1 μm to 4 μm.

15. The liquid crystal display device of claim 11 , wherein:
a sum of a width of the outer portion and a distance between an edge of the outer portion and an edge of the fine branch portion is from 2 μm to 7.5 μm.

16. The liquid crystal display device of claim 11 , further comprising:
a gate line formed on the first substrate; and
an insulating layer formed on the gate line,
wherein the pixel electrode includes a first sub-pixel electrode formed in a pixel region on one side of the gate line, and a second sub-pixel electrode formed in a pixel region on an opposite side of the gate line.

17. The liquid crystal display device of claim 16 , wherein:
the first sub-pixel electrode and the second sub-pixel electrode are arranged to receive differing voltages.

18. The liquid crystal display device of claim 11 , wherein:
the fine branch portion extends at an angle from 40 degrees to 50 degrees with respect to a stem portion of the cross-shaped stem portion.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Se Hyun
• Shin Cheol
• Chang Hak Sun
• Kim Ka Eun
• Shin Ki Chul

Classifications

• G02F1/134336 Primary

  Matrix · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F2001/134318

  Physics · mapped topic

• G02F2001/134345

  Physics · mapped topic

• G02F1/134345

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