Liquid crystal display device

• US 7,936,429 B2
• Filed: 09/14/2010
• Issued: 05/03/2011
• Est. Priority Date: 09/07/1999
• Status: Expired due to Fees

• Current Assignee: Japan Display Incorporated
• Original Assignee: Hitachi, Ltd.
• Inventors: Ono, Kikuo, Yamamoto, Tsunenori, Yoneya, Makoto, Nakayoshi, Yoshiaki, Hirakata, Junichi
• Primary Examiner(s): Duong; Thoi V
• Application Number:
  US12/881,507
• Publication Number:
  US 20100328596A1
• Time in Patent Office: 231 Days
• Field of Search: 349/141, 349/139, 349/143, 349/43, 349/138
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio

Abstract

A liquid crystal display includes a pair of transparent substrates opposed to each other with liquid crystal therebetween. One of the pair of transparent substrates has a plurality of drain signal lines and a plurality of gate signal lines, and a plurality of pixel regions defined by the drain signal lines and the gate signal lines. The pixel regions have a TFT element, a pixel electrode formed of a transparent electrode having a plurality of slits, and a counter electrode formed of a transparent electrode. The counter electrode is disposed between the pixel electrode and the one of the pair of transparent substrates in overlapping relationship with the transparent electrode of the pixel electrode and the gate signal line, and the counter electrode is connected with the counter electrode of an adjacent pixel region.

Claims

1. A liquid crystal display comprising:

a pair of transparent substrates opposed to each other with liquid crystal therebetween;

one of the pair of transparent substrates having a plurality of drain signal lines and a plurality of gate signal lines, and a plurality of pixel regions defined by the drain signal lines and the gate signal lines;

wherein the pixel regions have;

a TFT element;

a pixel electrode formed of a transparent electrode having a plurality of slits; and

a counter electrode formed of a transparent electrode;

wherein the counter electrode is disposed between the pixel electrode and the one of the pair of transparent substrates in overlapping relationship with the transparent electrode of the pixel electrode and the gate signal line, and the counter electrode is connected with the counter electrode of an adjacent pixel region.

2. The liquid crystal display according to claim 1, wherein an insulation layer is formed between the pixel electrode and the counter electrode.

3. The liquid crystal display according to claim 1, wherein an insulation layer is formed between the pixel electrode and the one of the pair of transparent substrates.

4. The liquid crystal display according to claim 1, wherein a part of the pixel electrode is overlapped with the gate signal line.

5. The liquid crystal display according to claim 4, wherein the counter electrode is disposed between the pixel electrode and the gate signal line.

6. The liquid crystal display according to claim 1, wherein the counter electrode is not overlapped with the TFT element.