Liquid Crystal Display Device

• US 20120002151A1
• Filed: 09/13/2011
• Published: 01/05/2012
• Est. Priority Date: 09/07/1999
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display East Incorporated (Japan Display Incorporated)
• Inventors: ONO, Kikuo, HIRAKATA, Junichi, NAKAYOSHI, Yoshiaki, YONEYA, Makoto, YAMAMOTO, Tsunenori
• Granted Patent: US 8,218,119 B2
• Time in Patent Office: Days
• US Class Current: 349/139
• 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
• CPC Class Codes: H05K 999/00 dummy group
• CPC Class Codes: H05K 999/99 dummy group

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 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. The pixel region has a TFT element, a first electrode formed of a transparent electrode having a plurality of slits, a connection area that connects the first electrode to the TFT element, and a second electrode formed of a transparent electrode. The second electrode is disposed between the first electrode and the one of the pair of transparent substrates, the second electrode is connected with the second electrode of an adjacent pixel region, and the connected second electrode is arranged at a position overlapping with the gate signal line.

Claims

1. A liquid crystal display comprising:

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

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 region has;

a TFT element;

a first electrode formed of a transparent electrode having a plurality of slits;

a connection area that connects the first electrode to the TFT element; and

a second electrode formed of a transparent electrode;

wherein the second electrode is disposed between the first electrode and the one of the pair of transparent substrates, the second electrode is connected with the second electrode of an adjacent pixel region, and the connected second electrode is arranged at a position overlapping with the gate signal line.

2. The liquid crystal display according to claim 1, wherein the first electrode is a pixel electrode, and the second electrode is a counter electrode.

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

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

5. The liquid crystal display according to claim 2, wherein at least a part of the pixel electrode is overlapped with the gate signal line.

6. The liquid crystal display according to claim 2, wherein at least a part of the counter electrode is arranged at a position overlapping the pixel electrode and the gate signal line.

7. The liquid crystal display according to claim 4, wherein the counter electrode has a opening portion, the opening portion is arranged at a position overlapping with the connection area.

8. The liquid crystal display according to claim 7, wherein the first insulating layer contact hole, the pixel electrode is connected to the TFT element through the contact hole.

9. The liquid crystal display according to claim 4, wherein the counter electrode is formed between the first insulating layer and the second insulating layer, the counter electrode is formed on a plurality of the pixel regions over the gate signal line.

10. The liquid crystal display according to claim 9, wherein the counter electrode line formed of metal is formed so that is connected to the counter electrode, the counter electrode line is formed on adjacent one of a plurality of the pixel regions.

11. The liquid crystal display according to claim 9, wherein the counter electrode line is arranged on the gate signal line through the second insulating film.