Liquid Crystal Display Device

• US 20120002150A1
• 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, Yoneya, Makoto, Yamamoto, Tsunenori, Hirakata, Junichi, Nakayoshi, Yoshiaki
• Granted Patent: US 8,218,118 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 first and second substrates opposed to each other with liquid crystal therebetween, the first substrate having a plurality of drain signal lines and 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 first electrode formed of a transparent conducting layer having a plurality of slits, a second electrode formed of a transparent conducting layer, and an insulating layer interposed between the first electrode and the second electrode. The second electrode is overlapped with a plurality of the slits of the first electrode in the pixel region, the first electrode is overlapped with the drain signal line and the gate signal line, and at least one of the first electrode and the second electrode is formed between the first substrate and the liquid crystal layer in the pixel region.

Claims

1. A liquid crystal display comprising:

a first substrate and a second substrate opposed to each other with liquid crystal therebetween, the first substrate 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 having;

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

a second electrode formed of a transparent conducting layer; and

an insulating layer interposed between the first electrode and the second electrode;

wherein the second electrode is overlapped with a plurality of the slits of the first electrode in the pixel region, the first electrode is overlapped with the drain signal line and the gate signal line; and

wherein at least one of the first electrode and the second electrode is formed between the first substrate and the liquid crystal layer in the pixel region.

2. The liquid crystal display according to claim 1, wherein the first electrode is formed between the second electrode and the liquid crystal layer.

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

and

the pixel region each have a thin-film transistor connected to the drain signal line and have a counter voltage signal line that feeds an electric signal to the counter electrode.

4. The liquid crystal display according to claim 3, wherein a plurality of the slits of the counter electrode is arranged at the position that does not overlap with the gate signal line and the drain signal line.

5. The liquid crystal display according to claim 1, the direction of the slits are formed on the gate signal line diagonally, and the slits have at least two directions.

6. The liquid crystal display according to claim 1, further comprising:

a spacer formed on the gate signal lines between the first substrate and the second substrate.

7. The liquid crystal display according to claim 3, wherein the pixel electrode has a plurality of slits, the slits of the pixel electrode is arranged at a position overlapping with the counter electrode.

8. The liquid crystal display according to claim 1, wherein the second electrode is formed without slits.