Liquid crystal display device and driving method thereof

• US 20070165171A1
• Filed: 12/21/2004
• Published: 07/19/2007
• Est. Priority Date: 12/29/2003
• Status: Abandoned Application

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Yun-Bok
• Application Number:
  US11/017,219
• Publication Number:
  US 20070165171A1
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 2201/121 common or background

Abstract

A liquid crystal display device includes first and second gate lines in an active region, and first and second data lines crossing the first and second gate lines, respectively, wherein the first and second gate lines, and the first and second data lines define first and second pixel regions, first and second thin film transistors in the first and second pixel regions, wherein the first thin film transistors connected with the first data line and the second gate line, and the second thin film transistor connected with the second data line and the first gate line, first and second pixel electrodes connected with the first and second thin film transistors, first and second common electrodes defining first and second substantially circular band shaped regions with the first and second pixel electrodes, and a first common line connected with the first and second common electrodes.

Claims

1. A liquid crystal display device, comprising:

first and second gate lines in an active region, and first and second data lines crossing the first and second gate lines, respectively, wherein the first and second gate lines, and the first and second data lines define first and second pixel regions;

first and second thin film transistors in the first and second pixel regions, wherein the first thin film transistor connected with the first data line and the second gate line, and the second thin film transistor connected with the second data line and the first gate line;

first and second pixel electrodes connected with the first and second thin film transistors;

first and second common electrodes defining first and second substantially circular band shaped regions with the first and second pixel electrodes; and

a first common line connected with the first and second common electrodes.

2. The device according to claim 1, wherein each of the first and second common electrodes includes first and second common electrode patterns, and each of the first and second pixel electrodes includes first and second pixel electrode patterns, wherein the first pixel electrode pattern is disposed between the first and second common electrode patterns, and the second pixel electrode pattern is disposed inside the second common electrode pattern.

3. The device according to claim 2, wherein an outer side of the first common electrode pattern extends toward a periphery of each of the first and second pixel regions;

an inner side of the first common electrode pattern has a substantially circular line shape;

the second common electrode pattern has a substantially circular band shape, the first pixel electrode pattern has a substantially circular band shape, and the second pixel electrode pattern has a substantially circular shape.

4. The device according to claim 2, further comprising a capacitor electrode disposed in each of the first and second pixel regions and overlapping the first common electrode pattern.

5. The device according to claim 4, the capacitor electrode includes a first capacitor electrode pattern connecting each of the first and second thin film transistors and each of the first and second pixel electrodes, and a second capacitor electrode pattern connected with each of the first and second pixel electrodes.

6. The device according to claim 4, further comprising a pixel connection line connecting the capacitor electrode and each of the first and second pixel electrodes.

7. The device according to claim 1, wherein the first and second common electrodes define first and second elliptical band shaped regions with the first and second pixel electrodes, respectively.

8. The device according to claim 1, further comprising:

a third gate line, wherein the second and third gate lines, and the first and second data lines define third and fourth pixel regions;

third and fourth thin film transistors in the third and fourth pixel regions, wherein the third thin film transistor connected with the first data line and the third gate line, and the fourth thin film transistor connected with the second data line and the second gate line;

third and fourth pixel electrodes connected with the third and fourth thin film transistors;

third and fourth common electrodes defining third and fourth substantially circular band shaped regions with the third and fourth pixel electrodes; and

a second common line connected with the third and fourth common electrodes.

9. The device according to claim 8, wherein each of the third and fourth common electrodes includes first and second common electrode patterns, and each of the third and fourth pixel electrodes includes first and second pixel electrode patterns, wherein the first pixel electrode pattern is disposed between the first and second common electrode patterns, and the second pixel electrode pattern is disposed inside the second common electrode pattern.

10. The device according to claim 9, wherein an outer side of the first common electrode pattern extends toward a periphery of each of the third and fourth pixel regions;

an inner side of the first common electrode pattern has a substantially circular line shape;

the second common electrode pattern has a substantially circular band shape;

the first pixel electrode pattern has a substantially circular band shape; and

the second pixel electrode pattern has a substantially circular shape.

11. The device according to claim 8, wherein the third and fourth common electrodes define first and second elliptical band shaped regions with the third and fourth pixel electrodes.

12. The device according to claim 8, further comprising first and second common connection lines connected with first and second common lines, wherein the first and second common connection lines are disposed at both sides of the active region.

13. A liquid crystal display device, comprising:

first and second gate lines in an active region, and first and second data lines crossing the first and second gate lines, respectively;

a first pixel connected with the first data line and the second gate line, and a second pixel connected with the second data line and the first gate line;

a first thin film transistor and a first liquid crystal capacitor in the first pixel;

a second thin film transistor and a second liquid crystal capacitor in the second pixel, wherein the first and second liquid crystal capacitors are connected with the first and second thin film transistors; and

a first common line connected with the first and second liquid crystal capacitors.

14. The device according to claim 13, wherein each of the first and second liquid crystal capacitors includes a common electrode and a pixel electrode, wherein the common electrode and the pixel electrodes define substantially circular band shaped regions.

15. The device according to claim 13, further comprising first and second storage capacitors connected in parallel with the first and second liquid crystal capacitors.

16. The device according to claim 13, further comprising:

a third gate line;

a third pixel connected with the first data line and the third gate line, and a fourth pixel connected with the second data line and the second gate line;

a third thin film transistor and a third liquid crystal capacitor in the third pixel, and a fourth thin film transistor and a fourth liquid crystal capacitor in the fourth pixel, wherein the third and fourth liquid crystal capacitors are connected with the third and fourth thin film transistors; and

a second common line connected with the third and fourth liquid crystal capacitors.

17. The device according to claim 16, wherein each of the third and fourth liquid crystal capacitors includes a common electrode and a pixel electrode, wherein the common electrode and the pixel electrodes define substantially circular band shaped regions.

18. The device according to claim 16, further comprising first and second storage capacitors connected in parallel with the third and fourth liquid crystal capacitors.

19. The device according to claim 13, further comprising first and second common connection lines connected with first and second common lines, wherein the first and second common connection lines are disposed at both sides of the active region.

20. A driving method of a liquid crystal display device, comprising:

scanning first, second and third gate lines sequentially;

applying first and second data voltages to first and second data lines;

applying a first common voltage to a first pixel connected with the second gate line and the first data line, and to a second pixel connected with the first gate line and the second data line, wherein the first common voltage have high and low levels alternately per frame; and

applying a second common voltage to a third pixel connected with the third gate line and the first data line, and to a fourth pixel connected with the second gate line and the second data line, wherein the second common voltage have high and low levels alternately per frame,

wherein the first data voltage applied to the first pixel has a inverse level to the first common voltage, the second data voltage applied to the second pixel has a inverse level to the first common voltage, the first data voltage applied to the third pixel has a inverse level to the second common voltage, and the second data voltage applied to the fourth pixel has a inverse level to the second common voltage.

21. The method according to claim 20, wherein the first pixel has the same polarity as the second pixel, the third pixel has the same polarity as the fourth pixel, and a voltage polarity between the first and third pixels is inverted.

22. The method according to claim 20, wherein a voltage level between the first and second common voltages is inverted.

23. The method according to claim 22, wherein a voltage level between the first and second data voltages is inverted when each of the first to third gate lines turns on.

24. The device according to claim 20, wherein each of the first to fourth pixels includes a common electrode and a pixel electrode, wherein the common electrode and the pixel electrodes define substantially circular band shaped regions.