In-plane field type liquid crystal display device comprising a structure which is prevented from charging with electricity

• US 6,108,066 A
• Filed: 01/12/2000
• Issued: 08/22/2000
• Est. Priority Date: 10/12/1995
• Status: Expired due to Term

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi, Ltd.
• Inventors: Yanagawa, Kazuhiko, Ohta, Masuyuki, Ashizawa, Keiichiro, Matsuyama, Shigeru, Mishima, Yasuyuki, Konishi, Nobutake, Yanai, Masahiro, Ogawa, Kazuhiro, Kinugawa, Kiyoshige
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US09/481,527
• Time in Patent Office: 223 Days
• Field of Search: 349/59, 349/96, 349/110, 349/111, 349/141, 349/143
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133331 Cover glasses
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• 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 1/136204 Arrangements to prevent high voltage or static electricity failures

Abstract

A liquid crystal display device includes a pair of substrates with a liquid crystal layer interposed between the pair of substrates. A video signal line and scanning signal line formed on one of the pair of substrates cross each other in a matrix form with a plurality of pixels are formed by adjoining the video signal lines and the scanning signal lines. A pixel electrode and a counter electrode are arranged in the plurality of pixels, respectively. A transparent electrically conductive layer is formed over one of the pair of substrates at a viewed side of the liquid crystal display device which is opposite to the liquid crystal layer side and the counter electrode is provided adjacent to the video signal line.

Claims

1. A liquid crystal display device comprising:

a pair of substrates;

a liquid crystal layer interposed between said pair of substrates;

a video signal line and scanning signal line formed on one of said pair of substrates and crossing each other in a matrix form;

a plurality of pixels formed by adjoining said video signal lines and said scanning signal lines; and

a pixel electrode and counter electrode arranged in said plurality of pixels, respectively;

wherein a transparent electrically conductive layer is formed over one of said pair of substrates at a viewed side of said liquid crystal display device which is opposite to the liquid crystal layer side; and

wherein said counter electrode is adjacent to said video signal line.

2. A liquid crystal display device according to claim 1, wherein said counter electrode is supplying a counter voltage from an external unit through a counter voltage signal line.

3. A liquid crystal display device according to claim 1, wherein said plurality of pixels are arranged in a matrix form.

4. A liquid crystal display device according to claim 1, wherein a semiconductor switching element is formed proximate to a cross point of said video signal line and said scanning signal line.

5. A liquid crystal display device according to claim 1, wherein said pixels have a relationship of O=P+1 with P being the number of pixel electrodes and O being the number counter electrodes.

6. A liquid crystal display device according to claim 1, wherein a width of said video signal line is larger than a width of said counter electrode.

7. A liquid crystal display device according to claim 1, wherein a width of said video signal line is larger than a width of said pixel electrode.