Liquid crystal display

Patent metadata

Field	Value
Publication number	US-9568783-B2
Application number	US-201514918188-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Jan 8, 2015
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

Provided is a liquid crystal display including: a first insulation substrate; a thin film transistor positioned on the first insulation substrate; a first subpixel electrode positioned on the thin film transistor and to which a first voltage is applied; a second subpixel electrode positioned on the thin film transistor and to which a second voltage is applied; a second insulation substrate facing the first insulation substrate; a common electrode positioned on the second insulation substrate and receiving a common voltage; and a liquid crystal layer disposed between the first insulation substrate and the second insulation substrate, in which the first subpixel electrode includes a plate region and a minute branch region overlapping the plate region with a passivation layer between the plate region and the minute branch region, and the plate region and the second subpixel electrode are positioned on a same layer.

First claim

What is claimed is:

1. A liquid crystal display, comprising:
a first insulation substrate;
a thin film transistor positioned on the first insulation substrate;
a first subpixel electrode positioned on the thin film transistor and to which a first voltage is applied;
a second subpixel electrode positioned on the thin film transistor and to which a second voltage is applied;
a second insulation substrate facing the first insulation substrate;
a common electrode positioned on the second insulation substrate and receiving a common voltage; and
a liquid crystal layer disposed between the first insulation substrate and the second insulation substrate,
wherein the first subpixel electrode includes a plate region and a minute branch region overlapping the plate region with a passivation layer between the plate region and the minute branch region, and the plate region and the second subpixel electrode are positioned on a same layer.

2. The liquid crystal display of claim 1 , wherein:
the minute branch region includes
a horizontal stem,
a vertical stem orthogonal to the horizontal stem, and
first minute branches obliquely extended from the horizontal stem and the vertical stem.

3. The liquid crystal display of claim 2 , wherein:
the plate region includes
a first plate portion and
a connection portion positioned on the same line as the vertical stem.

4. The liquid crystal display of claim 3 , wherein:
an end of the vertical stem of the minute branch region is extended to coincide with one end of the connection portion of the plate region.

5. The liquid crystal display of claim 4 , wherein:
a length of the vertical stem positioned in the second region is 30μm or less.

6. The liquid crystal display of claim 4 , wherein:
a voltage difference from the common electrode is reduced in the order of the first region, the second region, and the third region.

7. The liquid crystal display of claim 1 , wherein:
a plane of the second subpixel electrode and the plate region is a rectangle.

8. The liquid crystal display of claim 1 , wherein:
the second subpixel electrode includes
a second plate portion and
a plurality of minute branches extended from the second plate portion.

9. The liquid crystal display of claim 8 , wherein:
the connection portion is surrounded by the second plate portion.

10. The liquid crystal display of claim 1 , wherein:
the first subpixel electrode and second subpixel electrode form one pixel area, and one pixel area includes
a first region in which the minute branch region of the first subpixel electrode and a part of the first plate portion overlap with each other,
a second region in which the rest of the first plate portion of the first subpixel electrode is positioned, and
a third region in which the second subpixel electrode is positioned.

11. The liquid crystal display of claim 1 , wherein:
the plate region of the first subpixel electrode is positioned below the passivation layer, and the minute branch region of the first subpixel electrode is positioned on the passivation layer.

12. The liquid crystal display of claim 1 , wherein:
the plate region and the minute branch region of the first subpixel electrode are connected to each other through a contact hole.

13. The liquid crystal display of claim 1 , wherein:
the first voltage is larger than the second voltage.

Assignees

• Samsung Display Co Ltd

Inventors

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

Classifications

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F2001/134345

  Physics · mapped topic

• G02F1/133345

  Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence) · CPC title

• G02F1/134345

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