Liquid crystal display device

• US 8,035,786 B2
• Filed: 04/26/2011
• Issued: 10/11/2011
• Est. Priority Date: 09/07/1999
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ono, Kikuo, Yamamoto, Tsunenori, Yoneya, Makoto, Nakayoshi, Yoshiaki, Hirakata, Junichi
• Primary Examiner(s): DUONG, THOI V
• Application Number:
  US13/093,990
• Publication Number:
  US 20110199552A1
• Time in Patent Office: 168 Days
• Field of Search: 349/139, 349/141, 349/43, 349/143, 349/138
• 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

Abstract

A liquid crystal display includes a pair of transparent substrates opposed to each other with liquid crystal therebetween, and one of the substrates has a plurality of drain signal lines, gate signal lines, and pixel regions defined by the drain signal lines and the gate signal lines. The pixel regions include a TFT element, a first electrode formed of a transparent electrode, a second electrode formed of a transparent electrode. The second electrode is disposed between the first electrode and the one of the substrates, the second electrode is overlapped with the first electrode in the pixel region, is overlapped with the gate signal line, and is connected with the second electrode of an adjacent pixel region. A metal line is arranged for a plurality of the pixel regions, is overlapped with the second electrode, and is connected to the second electrode electrically.

Claims

1. A liquid crystal display comprising:

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

one of the pair of transparent substrates has a plurality of drain signal lines, 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 first electrode formed of a transparent electrode; 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 overlapped with the first electrode in the pixel region, the second electrode is overlapped with the gate signal line, and the second electrode is connected with the second electrode of an adjacent pixel region; and

wherein a metal line is arranged for a plurality of the pixel regions, the metal line is overlapped with the second electrode, and the metal line is connected to the second electrode electrically.

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

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

4. The liquid crystal display according to claim 1, wherein the first electrode has a plurality of slits.

5. The liquid crystal display according to claim 1, wherein the metal line is overlapped with the first electrode.

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