Liquid crystal display

• US 7,924,253 B2
• Filed: 10/16/2007
• Issued: 04/12/2011
• Est. Priority Date: 01/10/2007
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lai, Ming-Sheng, Chiang, Min-Feng, Huang, Hsueh-Ying
• Primary Examiner(s): Osorio; Ricardo L
• Application Number:
  US11/872,993
• Publication Number:
  US 20080165299A1
• Time in Patent Office: 1,274 Days
• Field of Search: 345 87- 89, 345/92, 345/94, 345/95, 345/690
• US Class Current: 345/89
• 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 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A liquid crystal display includes a plurality of pixels defined by adjacent scan lines and data lines. Each pixel includes a first sub-pixel defined by the scan line and a first common electrode line and a second sub-pixel defined by the scan line and a second common electrode line. The first common electrode line is connected to at least one of the voltage sources. The second common electrode is electrically connected to two of the voltage sources through a first and a second switch devices. The two switch devices are connected to different scan lines.

Claims

1. A liquid crystal display, comprising:

a plurality of data lines;

a plurality of scan lines crossing the data lines;

a plurality of first and second common electrode lines alternately arranged with the scan lines, wherein two neighboring gate lines and two neighboring data lines define a pixel unit;

a first switch device and a second switch device connected to different scan lines; and

a plurality of voltage sources, wherein the first common electrode lines are connected to one of the voltage sources, and the second common electrode lines are connected to two of the voltage sources through the first switch device and the second switch device.

2. The liquid crystal display of claim 1, wherein the voltage sources includes a first voltage source and a second voltage source, wherein the first common electrode lines are connected to the first voltage source, and the second common electrode lines are connected to the first voltage source through the first switch device and connected to the second voltage source through the second switch device, wherein the first voltage source provides a fixed voltage value and the second voltage source provides a changeable voltage value and is changed between adjacent frames.

3. The liquid crystal display of claim 2, wherein the changeable voltage value is changed to a different voltage levels.

4. The liquid crystal display of claim 1, wherein the voltage sources includes a first voltage source, a second voltage source and a third voltage source, wherein the first common electrode lines are connected to the third voltage source, and the second common electrode lines are connected to the first voltage source through the first switch device and connected to the second voltage source through the second switch device.

5. The liquid crystal display of claim 1, wherein the first voltage has a fixed voltage value, the second voltage has a changeable voltage value and is changed between adjacent frames and the third voltage has an oscillating voltage value.

6. The liquid crystal display of claim 5, wherein the second voltage is changed to a different voltage levels.

7. The liquid crystal display of claim 1, further comprising a third switch device and a fourth switch device, wherein the first common electrode lines are connected to two of the voltage sources through the third switch device and the fourth switch device, and different scan lines control the third switch device and the fourth switch.

8. The liquid crystal display of claim 7, wherein the first switch device and the third switch device are connected to same scan line, and the second switch device and the fourth switch device are connected to same scan line.

9. The liquid crystal display of claim 7, wherein the first switch device and the third switch device are connected to same scan line, and the second switch device and the fourth switch device are connected to different scan lines.

10. The liquid crystal display of claim 7, wherein the voltage sources includes a first voltage source, a second voltage source and a third voltage source, wherein the first common electrode lines are connected to the third voltage source through the third switch device and connected to the first voltage source through the fourth switch device, and the second common electrode lines are connected to the third voltage source through the first switch device and connected to the second voltage source through the second switch device.

11. The liquid crystal display of claim 7, wherein the voltage sources includes a first voltage source, a second voltage source, a third voltage source and a fourth voltage source, wherein the first common electrode lines are connected to the third voltage source through the third switch device and connected to the first voltage source through the fourth switch device, and the second common electrode lines are connected to the third voltage source through the first switch device and connected to the fourth voltage source through the second switch device.

12. The liquid crystal display of claim 11, wherein the first voltage source and the second voltage source provide changeable voltage values that are changed between adjacent frames and the third voltage source provides a fixed voltage value.

13. A liquid crystal display, comprising:

a plurality of data lines;

a plurality of scan lines crossing the data lines;

a plurality of first and second common electrode lines alternately arranged with the scan lines, wherein two neighboring gate lines and two neighboring data lines define a pixel unit;

a first switch device, a second switch device and a third switch device connected to different scan lines; and

a plurality of voltage sources, wherein the first common electrode lines are connected to one of the voltage sources, and the second common electrode lines are connected to two of the voltage sources through the first switch device, the second switch device and the third switch device.

14. The liquid crystal display of claim 13, wherein the voltage sources includes a first voltage source, a second voltage source and a third voltage source, wherein the first common electrode lines are connected to the first voltage source, and the second common electrode lines are connected to the second voltage source through the second switch device and connected to the third voltage source through the third switch device.

15. The liquid crystal display of claim 14, wherein the first voltage source provides a first voltage, the second voltage source provides a second voltage and the third voltage source provides a third voltage, wherein the first voltage has a fixed voltage value and the third voltage has a changeable voltage value and is changed between adjacent frames.

16. The liquid crystal display of claim 15, wherein the second voltage has a changeable voltage value and is changed between adjacent frames.

17. The liquid crystal display of claim 15, wherein the second voltage has a fixed voltage value.

18. The liquid crystal display of claim 13, further comprising a fourth switch device, a fifth switch device and a sixth switch device, wherein the first common electrode lines are connected to two of the voltage sources through the fourth switch device, the fifth switch device and the sixth switch device.

19. The liquid crystal display of claim 18, wherein the voltage sources includes a first voltage source, a second voltage source and a third voltage source, wherein the first common electrode lines are connected to the first voltage source through the fourth switch device and the fifth switch device and connected to the second voltage source through the sixth switch device, and the second common electrode lines are connected to the first voltage source through the first switch device and the second switch device and connected to the third voltage source through the third switch device.

20. The liquid crystal display of claim 13, further comprising a fourth switch device, a fifth switch device and a sixth switch device, wherein the first common electrode lines are connected to three of the voltage sources through the fourth switch device, the fifth switch device and the sixth switch device.

21. The liquid crystal display of claim 13, wherein the voltage sources includes a first voltage source, a second voltage source, a third voltage source and a fourth voltage source, wherein the first common electrode lines are connected to the first voltage source, and the second common electrode lines are connected to the second voltage source through the first switch device, connected to the third voltage source through the second switch device and connected to the fourth voltage source through the third switch device.

22. The liquid crystal display of claim 21, wherein the first voltage source provides a first voltage, the second voltage source provides a second voltage, the third voltage source provides a third voltage and the fourth voltage source provides a fourth voltage, wherein the first voltage has a fixed voltage value and the third voltage has a changeable voltage value and is changed between adjacent frames.

23. The liquid crystal display of claim 22, wherein the fourth voltage has a fixed voltage value and the third voltage has a changeable voltage value and is changed between adjacent frames, wherein the third voltage is changed to a same voltage level or is changed to different voltage levels.

24. The liquid crystal display of claim 22, wherein the fourth voltage is changed to a same voltage level or is changed to different voltage levels between adjacent frames.

25. The liquid crystal display of claim 13, wherein the first common electrode lines and the second common electrode lines are arranged in a zigzag pattern.