Fringe field switching mode LCD with first and second pixel electrodes each having a plurality of slits where the second electrodes are positioned between the first electrodes at a predetermined angle

• US 7,545,470 B2
• Filed: 08/30/2005
• Issued: 06/09/2009
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: Hydis Technology Company Limited (E Ink Holdings Incorporated)
• Original Assignee: Hydis Technology Company Limited (E Ink Holdings Incorporated)
• Inventors: Kim, Hyang Yul, Jeong, Youn Hak, Park, Jun Baek
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): HEYMAN, JOHN S
• Application Number:
  US11/215,235
• Publication Number:
  US 20060279684A1
• Time in Patent Office: 1,379 Days
• Field of Search: 349/48, 349/141, 345 87- 93
• 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 an 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 having a plurality of slits and positioned on the insulator while being spaced from each other; and

second pixel electrodes having a plurality of slits and positioned between the respective first pixel electrodes, with an insulator therebetween, with a predetermined angle relative to the first pixel electrodes,

wherein an electric field intensity of the first and second pixel electrodes is separately varied so that an angle between the composite electric field and the liquid crystal molecules is in the range of 30-60°

.

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 with a protective layer being interposed between the first pixel electrodes and the second pixel electrodes.

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°

.