Liquid crystal display device

• US 7,656,488 B2
• Filed: 12/27/2006
• Issued: 02/02/2010
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Momoi, Yuichi, Kazuyoshi, Nagayama
• Primary Examiner(s): Le; Uyen-Chau N
• Assistant Examiner(s): Bedtelyon; John M
• Application Number:
  US11/647,500
• Publication Number:
  US 20070165173A1
• Time in Patent Office: 1,133 Days
• Field of Search: 349/129
• US Class Current: 349/129
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/133769 comprising an active, e.g. switchable, alignment layer
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned

Abstract

An LCD device includes liquid crystal molecules of n-type liquid crystal, and a viewing-angle control pixel controlling n-type liquid crystal in a pixel. The liquid crystal molecules are inclined in vertical and horizontal directions. The liquid crystal display device may control a viewing angle in vertical and horizontal directions without forming a white sub-pixel.

Claims

1. A liquid crystal display device, comprising:

liquid crystal molecules;

a viewing-angle control pixel controlling the liquid crystal molecules to have the liquid crystal molecules inclined in vertical and horizontal directions and having a pixel electrode including a plurality of first pixel holes arranged in a horizontal direction and a plurality of second pixel holes arranged in a vertical direction; and

RGB-pixels being separate from the viewing-angle control pixel and having a pixel electrode including a plurality of third pixel holes different shape from the first and second pixel holes,

wherein no coloring layer is formed in the viewing-angle control pixel.

2. The device of claim 1, wherein each of the RGB-pixels comprises:

the pixel electrode including the third pixel holes having one of circular shape and elliptical shape; and

a common electrode exposed through the third pixel holes.

3. The device of claim 2, wherein the viewing-angle control pixel comprises the pixel electrode having the first and second pixel holes and wherein the common electrode is exposed through the first and second pixel holes in the horizontal and vertical directions.

4. A liquid crystal display device, comprising:

a plurality of RGB pixels having liquid crystal molecules which change an alignment in response to application of a voltage and displaying information based on the changed alignment; and

a plurality of control pixels operable to change the display of the information upon application of the voltage and being separate from each of the RGB pixels;

wherein the control pixels have a pixel electrode including a plurality of first pixel holes arranged in a horizontal direction and a plurality of second pixel holes arranged in a vertical direction and the RGB pixels have a pixel electrode including a plurality of third pixel holes different shape from the first and second pixel holes,

wherein no coloring layer is formed in the viewing-angle control pixel.

5. The device of claim 4, wherein the control pixels comprise liquid crystal molecules which change the alignment upon application of the voltage.

6. The device of claim 5, wherein the display of the information is viewable from a predetermined direction in a first mode and the display of the information is unviewable from the direction in a second mode wherein no voltage is applied to the control pixels in the first mode and voltage is applied to the control pixels in the second mode.

7. The device of claim 4, wherein the display of the information is identical in a front viewing angle, a vertical viewing angle, a horizontal viewing angle and an inclined viewing angle upon application of no voltage.

8. The device of claim 4, wherein a horizontal view of the control pixels is different from a vertical view of the control pixels upon application of the voltage.

9. A method for fabricating of a liquid crystal display device, comprising:

forming liquid crystal molecules;

forming a viewing-angle control pixel controlling the liquid crystal molecules to have the liquid crystal molecules inclined in vertical and horizontal directions and having a pixel electrode including a plurality of first pixel holes arranged in a horizontal direction and a plurality of second pixel holes arranged in a vertical direction;

forming RGB-pixels being separate from the viewing-angle control pixel and having a pixel electrode including a plurality of third pixel holes different shape from the first and second pixel holes,

arranging the liquid crystal molecules to be inclined in vertical and horizontal directions,

wherein no coloring layer is formed in the viewing-angle control pixel.

10. The method of claim 9, wherein forming the viewing-angle control pixel and the RGB pixels further comprise:

forming the pixel electrode having the first and second pixel holes in the RGB pixels and the pixel electrode having the third pixel holes in the viewing-angle control pixel; and

forming a common electrode exposed through the first pixel holes, the second pixel holes, and the third pixel holes.

11. The method of claim 10, wherein the forming the pixel electrode comprises forming the third pixel holes to have one of circular shape and elliptical shape.

12. The method of claim 10, wherein the forming the pixel electrode having the first and second pixel hole which expose the common electrodes in the horizontal and vertical directions.