Liquid crystal display device

• US 20110242471A1
• Filed: 06/13/2011
• Published: 10/06/2011
• Est. Priority Date: 04/12/2006
• Status: Abandoned Application

• Current Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Sasaki, Tohru, Ochiai, Takahiro, Miyazawa, Toshio, Maki, Masahiro, Nakao, Takayuki
• Application Number:
  US13/067,599
• Publication Number:
  US 20110242471A1
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/133555 Transflectors
• 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 1/136227 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 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body

Abstract

A liquid crystal display device having a liquid crystal display panel includes a first substrate, a second substrate, and liquid crystal interposed between the first and second substrates. The first substrate includes an active element, a first insulating film formed on the active element, a plurality of first electrodes disposed on the first insulating film, a second insulating film disposed on the first electrodes, and a pixel electrode disposed on the second insulating film. The pixel electrode is electrically coupled to the active element via a portion defining a contact hole formed in a portion defining a clearance between the plurality of first electrodes.

Claims

1. A liquid crystal display device comprising a first substrate, a second substrate, liquid crystal interposed between the first and second substrates, a plurality of scan lines and a plurality of video lines which are formed on the first substrate, and a plurality of pixels, wherein

each of the plurality of pixels has a thin film transistor formed on the first substrate, a pixel electrode connected with the thin film transistor, and a pixel region surrounded by a pair of the scan lines which are adjacent each other and a pair of the video lines which are adjacent each other,

at least one of the pixels has a first contact hole and a second contact hole in the pixel region,

the first contact hole and the second contact hole are arranged in a direction where the pair of the video lines extend, and

the pixel electrode is connected with a drain electrode of the thin film transistor via a first contact hole.

2. A liquid crystal display device according to claim 1, wherein the pixel region is rectangular and has a pair of long sides and a pair of short sides,

the first contact hole and the second contact hole are disposed at a substantially center portion in a direction of the short sides.

3. A liquid crystal display device according to claim 1, wherein the first contact hole and the second contact hole are disposed at a substantially center portion in a direction where the pair of the scan lines extend.

4. A liquid crystal display device according to claim 1, wherein the first contact hole is formed above the second contact hole.

5. A liquid crystal display device according to claim 1, wherein each of the plurality of pixels has a counter electrode,

the liquid crystal is driven by an electric field generated by the pixel electrode and the counter electrode, and

the counter electrode is formed on the first substrate.

6. A liquid crystal display device comprising a first substrate, a second substrate, liquid crystal interposed between the first and second substrates, a plurality of scan lines and a plurality of video lines which are formed on the first substrate, and a plurality of pixels, wherein

each of the plurality of pixels has a thin film transistor formed on the first substrate, a pixel electrode, a counter electrode, and a pixel region surrounded by a pair of the scan lines which are adjacent each other and a pair of the video lines which are adjacent each other,

the pixel electrode is formed on the first substrate and connected with the thin film transistor,

the counter electrode is formed on the first substrate,

the liquid crystal is driven by an electric field generated by the pixel electrode and the counter electrode,

at least one of the pixels has a first contact hole and a second contact hole in the pixel region,

the first contact hole and the second contact hole are arranged in a direction where the pair of the video lines extend, and disposed at a substantially center portion in a direction where the pair of the scan lines extend, and

the pixel electrode is connected with a drain electrode of the thin film transistor via a first contact hole.

7. A liquid crystal display device according to claim 6, wherein the pixel region is rectangular and has a pair of long sides and a pair of short sides,

the pair of long sides extend in a direction where the pair of the video lines extend, and

the pair of short sides extend in a direction where the pair of the scan lines extend.

8. A liquid crystal display device according to claim 6, wherein the first contact hole is formed above the second contact hole.