Transflective liquid crystal display device

• US 8,243,238 B2
• Filed: 05/27/2011
• Issued: 08/14/2012
• Est. Priority Date: 10/13/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Imayama, Hirotaka, Morimoto, Masateru
• Primary Examiner(s): PENG, CHARLIE YU
• Application Number:
  US13/067,387
• Publication Number:
  US 20110234958A1
• Time in Patent Office: 445 Days
• Field of Search: 349/114, 349/141
• US Class Current: 349/114
• 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]

Abstract

To improve display quality in a transflective liquid crystal display device.

In a transflective liquid crystal display device based on the IPS system according to the present invention, when a liquid crystal layer is of positive type liquid crystal, the initial orientation direction of liquid crystal in the liquid crystal layer is perpendicular to the direction in which a l-display line extends, or angularly displaced within ±2 degrees clockwise with respect to the direction in which the l-display line extends. When the liquid crystal layer is of negative type liquid crystal, the initial orientation direction of liquid crystal in the liquid crystal layer is parallel to the direction in which the l-display line extends, or angularly displaced within ±2 degrees clockwise with respect to the direction in which the l-display line extends.

Claims

1. A liquid crystal display device comprising:

a first region and a second region formed in a subpixel,

a plurality of first pixel electrodes belonging to the first region and a plurality of second pixel electrodes belonging to the second region,

a third electrode of planar form of a counter electrode is superimposed below the plurality of the first pixel electrodes and the plurality of the second pixel electrodes through an insulating layer,

wherein a number of first pixel electrodes is smaller than a number of second pixel electrodes,

a length of the first region is longer than a length of the second region,

the first region is a transparent part and the second region is a reflective part,

the plurality of second pixel electrodes include a longer electrodes and a shorter electrode, the shorter electrode is sandwiched by longer electrodes, and

a through hole is formed at a region where the shorter electrodes are arranged in the second region.

2. The liquid crystal display device according to claim 1, wherein the first region and the second region are rhomboid shapes.

3. The liquid crystal display device according to claim 1, wherein the plurality of the second pixel electrodes are disposed parallel to each other and form a comb-shaped structure.

4. The liquid crystal display device according to claim 1, wherein the plurality of the first pixel electrodes are disposed parallel to each other and form a comb-shaped structure.

5. The liquid crystal display device according to claim 3, wherein the plurality of first pixel electrodes are disposed parallel to each other and form a comb-shaped structure.