LIQUID CRYSTAL DISPLAY AND TERMINAL UNIT

• US 20080284927A1
• Filed: 05/16/2008
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: NLT Technologies, Ltd.
• Original Assignee: NEC LCD Technologies Limited (NEC Corporation)
• Inventors: Mori, Kenichi, Sakamoto, Michiaki
• Granted Patent: US 8,064,030 B2
• Time in Patent Office: Days
• US Class Current: 349/37
• 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.

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 connecting together corresponding common-electrode lines each connected to said group of common electrodes corresponding to said transmissive area 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 7, wherein said first peripheral common-electrode line includes a first portion configured by a gate layer 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 layer and disposed inside of said seal member.

9. The liquid crystal display device according to claim 6, wherein said first and second common-electrode lines are applied with first and second common-electrode signals, respectively, which are driven by a gate-line inverting drive scheme, and data signals applied to said first and second pixel electrodes are driven by a gate-line inverting drive scheme.

10. 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.

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

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

17. 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 first and second sub-pixels;

first and second pixel electrodes each disposed in said first and second sub-pixels, respectively; and

first and second common electrodes disposed in said first and second sub-pixels, respectively, to oppose said first and second pixel electrodes, respectively, wherein;

said first common electrodes in said pixels arranged on an odd-numbered row are connected to said second common electrodes in said pixels arranged on an even-numbered row to form a first group of common electrodes connected together, said second common electrodes in said pixels arranged on said odd-numbered row are connected to said first common electrodes in said pixels arranged on said even-numbered row to form a second group of common electrodes connected together.

14. The liquid crystal display device according to claim 13, 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.

15. The liquid crystal display device according to claim 13, wherein said first and second groups are applied with first and second common-electrode signals, respectively, which are driven by a gate-line inverting drive scheme, and data signals applied to said first and second pixel electrodes are driven by a gate-line inverting drive scheme.

16. The liquid crystal display device according to claim 13, wherein one of a first common-electrode signal applied to said first group and a second common-electrode signal applied to said second group is obtained by inverting the other of said first and second common-electrode signals.

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