Liquid crystal display device

• US 20070242205A1
• Filed: 03/28/2007
• Published: 10/18/2007
• 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: Asakura, Toshiki, Sasaki, Tohru, Imabayashi, Makiko, Shimura, Masato
• Granted Patent: US 7,864,282 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• 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 2201/122 having a particular pattern

Abstract

A liquid crystal display device that includes: a liquid crystal display panel configured by a pair of substrates sandwiching therebetween a liquid crystal material with a positive dielectric anisotropy; and a flat-shaped common electrode and a pixel electrode disposed on one of the pair of substrates with an overlay, via an insulator layer, between the common electrode and the pixel electrode when viewed from above. In the liquid crystal display device, the pixel electrode is extended in a first direction, and includes a plurality of comb-like electrode sections aligned in a second direction orthogonal to the first direction, and the comb-like electrode sections of the pixel electrode are varied in width in the second direction for a plurality of times at intervals shorter than a side extending in the first direction.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal display panel configured by a pair of substrates sandwiching therebetween a liquid crystal material with a positive dielectric anisotropy; and

a flat-shaped common electrode and a pixel electrode disposed on one of the pair of substrates with an overlay, via an insulator layer, between the common electrode and the pixel electrode when viewed from above, wherein

the pixel electrode is extended in a first direction, and includes a plurality of comb-like electrode sections aligned in a second direction orthogonal to the first direction, and

the comb-like electrode sections of the pixel electrode are varied in width in the second direction for a plurality of times at intervals shorter than a side extending in the first direction.

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

the comb-like electrode sections each have a plurality of protruding portions or recessed portions, in the second direction, in the side or another extending in the first direction.

3. The liquid crystal display device according to claim 1, wherein

the comb-like electrode sections each have a plurality of protruding portions, in the second direction, in the side or another extending in the first direction, and

in two of the adjacent comb-like electrode sections, the protruding portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are aligned when viewed from the first direction.

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

the comb-like electrode sections each have a plurality of protruding portions, in the second direction, in the side or another extending in the first direction, and

in two of the adjacent comb-like electrode sections, the protruding portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are slightly misaligned when viewed from the first direction by an amount smaller than an interval between the protruding portions in one of the sides.

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

the comb-like electrode sections each have a plurality of recessed portions, in the second direction, in the side or another extending in the first direction, and

in two of the adjacent comb-like electrode sections, the recessed portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are aligned when viewed from the first direction.

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

the comb-like electrode sections each have a plurality of recessed portions, in the second direction, in the side or another extending in the first direction, and

in two of the adjacent comb-like electrode sections, the recessed portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are slightly misaligned when viewed from the first direction by an amount smaller than an interval between the recessed portions in one of the sides.

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

the comb-like electrode sections each have a protruding portion and a recessed section alternately, in the second direction, in the side or another extending in the first direction.

8. The liquid crystal display device according to claim 7, wherein

in two of the adjacent comb-like electrode sections, the protruding portions and the recessed portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are respectively aligned when viewed from the first direction.

9. The liquid crystal display device according to claim 7, wherein

in two of the adjacent comb-like electrode sections, the protruding portions and the recessed portions in the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections are alternately aligned when viewed from the first direction.

10. A liquid crystal display device, comprising:

a liquid crystal display panel configured by a pair of substrates sandwiching therebetween a liquid crystal material with a positive dielectric anisotropy; and

a flat-shaped common electrode and a pixel electrode disposed on one of the pair of substrates with an overlay, via an insulator layer, between the common electrode and the pixel electrode when viewed from above, wherein

the pixel electrode is extended in a first direction, and includes a plurality of comb-like electrode sections aligned in a second direction orthogonal to the first direction, and

the comb-like electrode sections of the pixel electrode are changed in position, when viewed from the second direction, for a plurality of times at intervals shorter than a side extending in the first direction, and at distances shorter than a width along the second direction.

11. The liquid crystal display device according to claim 10, wherein

the comb-like electrode sections each have a plurality of protruding portions, in the second direction, in the side or another extending in the first direction, and a plurality of recessed portions, in the second direction, in a remaining of the two sides, and

in one of the comb-like electrode sections, the protruding portions and the recessed portions in the two sides extending in the first direction are aligned when viewed from the first direction.

12. The liquid crystal display device according to claim 11, wherein

in two of the adjacent comb-like electrode sections, one of the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections has a plurality of protruding portions in the second direction, and a remaining of the two sides has a plurality of recessed portions in the second direction.

13. The liquid crystal display device according to claim 11, wherein

in two of the adjacent comb-like electrode sections, the two sides opposing each other via a slit formed between the two of the adjacent comb-like electrode sections each have a plurality of protruding portions in the second direction, or a plurality of recessed portions in the second direction.