Fringe field switching mode LCD having high transmittance

• US 20060279683A1
• Filed: 08/18/2005
• Published: 12/14/2006
• Est. Priority Date: 06/14/2005
• Status: Abandoned Application

• Current Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Original Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Inventors: Kim, Hyang Yul, Jeong, Youn Hak, Park, Jun Baek
• Application Number:
  US11/207,652
• Publication Number:
  US 20060279683A1
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• 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 and second pixel electrodes positioned on a protective layer, which is interposed between the first and second pixel electrodes, with a predetermined horizontal spacing from the respective first pixel electrodes and electrically connected to the first pixel electrodes via contact holes formed on the protective layer.

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 and

second pixel electrodes positioned on a protective layer, which is interposed between the first and second pixel electrodes, with a predetermined horizontal spacing from the respective first pixel electrodes and electrically connected to the first pixel electrodes via contact holes formed on the protective layer.

2. The fringe field switching mode LCD as claimed in claim 1, wherein the vertical spacing between the first and second pixel electrodes is 1,000-3,000Å

.

3. The fringe field switching mode LCD as claimed in claim 1, wherein the protective layer is made of any material chosen from a group comprising resin and inorganic insulator.

4. The fringe field switching mode LCD as claimed in claim 1, wherein the first and second pixel electrodes have the same width of less than 5 μ

m.

5. The fringe field switching mode LCD as claimed in claim 1, wherein the distance between the first pixel electrodes is the same as that between the second pixel electrodes and is the sum of the width of the first and second pixel electrodes and twice the spacing between the respective first and second pixel electrodes.

6. The fringe field switching mode LCD as claimed in claim 1, wherein the horizontal spacing is less than 5 μ

m.