Liquid crystal display device

• US 20100253895A1
• Filed: 06/17/2010
• Published: 10/07/2010
• Est. Priority Date: 04/12/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Sasaki, Tohru, Ochiai, Takahiro, Miyazawa, Toshio, Maki, Masahiro, Nakao, Takayuki
• Granted Patent: US 8,064,026 B2
• Time in Patent Office: Days
• US Class Current: 349/138
• 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 including a liquid crystal display panel having a plurality of subpixels, comprising:

a first substrate, the first substrate including;

an active element;

a first insulating film formed on the active element;

a plurality of first electrodes formed in each of the subpixels, said plurality of first electrodes being disposed on the first insulating film;

said plurality of first electrodes being insulated from each other,

a second insulating film disposed on the first electrodes; and

a pixel electrode disposed on the second insulating film, the pixel electrode being 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;

a second substrate; and

liquid crystal interposed between the first and second substrates.

2. The liquid crystal display device according to claim 1,

wherein the first insulating film has a portion defining a first contact hole formed in a portion defining a clearance between the plurality of first electrodes;

the second insulating film is formed between the first electrodes and the pixel electrode, and inside the portion defining a first contact hole;

a portion defining a second contact hole is formed in the second insulating film inside the portion defining a first contact hole; and

the pixel electrode is electrically coupled to the active element via the portion defining a second contact hole.

3. The liquid crystal display device according to claim 1, wherein each of portions of edges of the first electrodes in which the portion defining a clearance is formed and in which the portion defining a contact hole is formed has a recess.

4. The liquid crystal display device according to claim 1,

wherein the pixel electrode, the first electrodes, and the second insulating film form a holding capacitance.

5. The liquid crystal display device according to claim 1,

wherein the pixel electrode is a transparent electrode.

6. The liquid crystal display device according to claim 1,

wherein the first electrodes include a transparent electrode.

7. The liquid crystal display device according to claim 1,

wherein the first electrodes include a reflection electrode.

8. The liquid crystal display device according to claim 1,

wherein the first electrodes include a transparent electrode and a reflection electrode.

9. The liquid crystal display device according to claim 1,

wherein the first electrodes are counter electrodes;

and

the liquid crystal is driven by an electric field generated by the first electrodes and the pixel electrode.