Fringe field switching mode LCD

• US 20060279684A1
• Filed: 08/30/2005
• Published: 12/14/2006
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: Hydis Technology Company Limited (E Ink Holdings Incorporated)
• Original Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Inventors: Kim, Hyang Yul, Jeong, Youn Hak, Park, Jun Baek
• Granted Patent: US 7,545,470 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned

Abstract

A fringe field switching mode LCD includes a lower substrate having a gate bus line and a data bus line arranged to cross each other and form unit pixels and a counter electrode and a pixel electrode positioned within each unit pixel region with a gate insulator interposed between them and an upper substrate provided with a color filter corresponding to each pixel region and bonded to the lower substrate with a liquid crystal layer interposed between them. The pixel electrode includes first pixel electrodes positioned on the gate insulator while being spaced from each other and second pixel electrodes positioned between the respective first pixel electrodes with a predetermined angle relative to them.

Claims

1. A fringe field switching mode LCD comprising:

a lower substrate having a gate bus line and a data bus line arranged to cross each other and form unit pixels and a counter electrode and a pixel electrode positioned within each unit pixel region with a gate insulator interposed between them and

an upper substrate provided with a color filter corresponding to each pixel region and bonded to the lower substrate with a liquid crystal layer interposed between them, wherein the pixel electrode comprises;

first pixel electrodes positioned on the gate insulator while being spaced from each other and

second pixel electrodes positioned between the respective first pixel electrodes with a predetermined angle relative to them.

2. The fringe field switching mode LCD as claimed in claim 1, wherein the first pixel electrodes are positioned on top of the second pixel electrodes while being electrically connected thereto with a protective layer being interposed between them.

3. The fringe field switching mode LCD as claimed in claim 1, wherein the predetermined angle is equal to the angle between the electric field caused by the first pixel electrodes and that caused by the second pixel electrodes and is in the range of 30-60°

.

4. The fringe field switching mode LCD as claimed in claim 1, wherein the direction of the composite electric field of the electric field caused by the first pixel electrodes and that caused by the second pixel electrodes maintains a predetermined angle relative to the liquid crystal director of the liquid crystal layer.

5. The fringe field switching mode LCD as claimed in claim 4, wherein the angle between the composite electric field and the liquid crystal molecules is in the range of 30-60°

.