Liquid crystal display device with common electrode line and seal member at different positions

• US 8,064,030 B2
• Filed: 05/16/2008
• Issued: 11/22/2011
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd.
• Original Assignee: Ned Lcd Technologies, Ltd.
• Inventors: Naka, Kenichirou, Mori, Kenichi, Nagai, Hiroshi, Sakamoto, Michiaki
• Primary Examiner(s): NGUYEN, HOAN C
• Application Number:
  US12/122,236
• Publication Number:
  US 20080284927A1
• Time in Patent Office: 1,285 Days
• Field of Search: 349/114, 349141-144, 349/153, 349/190
• US Class Current: 349/153
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• 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: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0456 with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

A liquid crystal display device includes an array of pixels each including a plurality of sub-pixels, a plurality of pixel electrodes disposed in the respective sub-pixels, and a plurality of common electrodes disposed in the respective sub-pixels. The common electrode disposed in each of the sub-pixels in one of the pixels on each row is connected to the common electrodes disposed in the corresponding sub-pixels in the others of the pixels on the each row, to form a group of common electrodes connected together.

Claims

1. A liquid crystal display device comprising:

an array of pixels each including a plurality of sub-pixels;

a plurality of pixel electrodes each disposed in a corresponding one of said sub-pixels; and

a plurality of common electrodes each disposed in a corresponding one of said sub-pixels to oppose a corresponding one of said pixel electrodes, wherein;

one of said common electrodes disposed in each of the sub-pixels in one of said pixels on each row is connected to others of said common electrodes disposed in corresponding sub-pixels in the others of said pixels arranged on said each row, to form a group of common electrodes connected together and wherein said pixels each include a transmissive area,

said liquid crystal display device further comprises a first peripheral common-electrode line connecting together corresponding common-electrode lines each connected to said group of common electrodes corresponding to said transmissive area,

wherein said first peripheral common-electrode line includes a first portion configured by a gate line and disposed outside of a seal member which encapsulates a liquid crystal layer in said liquid crystal display device, and a second portion configured by a data line and disposed inside of said seal member.

2. The liquid crystal display device according to claim 1, wherein said group of common electrodes is connected to a corresponding common-electrode line extending adjacent to said each row.

3. The liquid crystal display device according to claim 1, wherein said common-electrode line connected to said group of common electrodes in said each row is connected to corresponding common-electrode lines connected to a corresponding group of common electrodes in other rows via a corresponding peripheral common-electrode line at an end of said common-electrode line.

4. The liquid crystal display device according to claim 1, wherein said sub-pixels in each of said pixels include at least a first sub-pixel and a second sub-pixel.

5. The liquid crystal display device according to claim 4, wherein said pixels each include a reflective area and a transmissive area, said first sub-pixel corresponds to said reflective area and said second sub-pixel corresponds to said transmissive area.

6. The liquid crystal display device according to claim 5, wherein a first peripheral common-electrode line is disposed inside of a second peripheral common-electrode line connecting together corresponding common-electrode lines connected to said group of common electrodes corresponding to said reflective area.

7. The liquid crystal display device according to claim 6, wherein a gate signal line extends between said first peripheral common-electrode line and said second peripheral common-electrode line.

8. The liquid crystal display device according to claim 6, wherein a first common-electrode signal is supplied via a gate line inversion drive to a first common electrode group, and a second common-electrode signal is supplied via a gate line drive to a second common electrode group.

9. The liquid crystal display device according to claim 6, wherein one of a first common-electrode signal applied to said first peripheral common-electrode line and a second common-electrode signal applied to said second peripheral common-electrode line is obtained by inverting the other of said first and second common-electrode signals.

10. The liquid crystal display device according to claim 8, wherein one of said first and second common-electrode signals has a center value of a signal amplitude which is different from a center value of a signal amplitude of the other of said first and second common-electrode signals.

11. The liquid crystal display device according to claim 8, one of said first and second common-electrode signals has an amplitude larger than an amplitude of the other of said first and second common-electrode signals.

12. A terminal unit comprising the liquid crystal display device according to claim 1.

13. A liquid crystal display device comprising:

an array of pixels each including a plurality of sub-pixels;

a plurality of pixel electrodes each disposed in a corresponding one of said sub-pixels; and

a plurality of common electrodes each disposed in a corresponding one of said sub-pixels to oppose a corresponding one of said pixel electrodes, wherein;

one of said common electrodes disposed in each of the sub-pixels in one of said pixels on each row is connected to others of said common electrodes disposed in corresponding sub-pixels in the others of said pixels arranged on said each row, to form a group of common electrodes connected together, and wherein said pixels each include a reflective area and a transmissive area;

said liquid crystal display device further comprises a first peripheral common-electrode line connecting together corresponding common-electrode lines each connected to said group of common electrodes corresponding to said transmissive area, and a second peripheral common-electrode line connecting together corresponding common-electrode lines connected to said group of common electrodes corresponding to said reflective area,

wherein said sub-pixels in each of said pixels include at least a first sub-pixel and a second sub-pixel, said first sub-pixel corresponds to said reflective area and said second sub-pixel corresponds to said transmissive area,

wherein a gate signal line extends between said first peripheral common-electrode line and said second peripheral common-electrode line.

14. A terminal unit comprising the liquid crystal display device according to claim 13.