In-plane switching mode liquid crystal display device and method of fabricating the same

• US 20040125057A1
• Filed: 05/29/2003
• Published: 07/01/2004
• Est. Priority Date: 12/31/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Moon, Hong-Man, Lee, Su-Woong
• Granted Patent: US 6,894,756 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

An in-plane switching mode liquid crystal display device includes a plurality of gate lines and data lines defining a plurality of pixel areas including at least first and second regions, a driving device for supplying a signal to adjacent pixel areas, a plurality of pixel electrodes within the first and second regions within the pixel area, the pixel electrodes being supplied a first data voltage from the driving device of the corresponding pixel to the first region and being supplied a second voltage from the driving device of an adjacent pixel within the second region, and a plurality of common electrodes within the first and second regions of the pixel areas for forming a horizontal electric field together with the pixel electrodes.

Claims

1. An in-plane switching mode liquid crystal display device, comprising:

a plurality of gate lines and data lines defining a plurality of pixel areas including at least first and second regions;

a driving device for supplying a signal to adjacent pixel areas;

a plurality of pixel electrodes within the first and second regions within the pixel area, the pixel electrodes being supplied a first data voltage from the driving device of the corresponding pixel to the first region and being supplied a second voltage from the driving device of an adjacent pixel within the second region; and

a plurality of common electrodes within the first and second regions of the pixel areas for forming a horizontal electric field together with the pixel electrodes.

2. The device according to claim 1, wherein the driving device includes a thin film transistor.

3. The device according to claim 2, wherein the thin film transistor comprises:

a gate line;

a gate insulating layer on the gate line;

a semiconductor layer on the gate insulating layer; and

a data line and a drain electrode on the semiconductor layer.

4. The device according to claim 3, wherein the drain electrode is connected to the pixel electrode of an adjacent pixel.

5. The device according to claim 3, wherein the common electrode and the pixel electrode are disposed on a same layer.

6. The device according to claim 5, wherein the common electrode and the pixel electrode are disposed on one of the substrate, the gate insulating layer, and a passivation layer.

7. The device according to claim 3, wherein the common electrode is formed on the substrate and the pixel electrode is disposed on the gate insulating layer.

8. The device according to claim 3, wherein the common electrode is disposed on the gate insulating layer and the pixel electrode is disposed on the substrate.

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

a common line disposed within the pixel and connected to the common electrode; and

a first pixel electrode line overlapping the common line and connected to the pixel electrode within the first region and a second pixel electrode line connected to the pixel electrode within the second region.

10. The device according to claim 9, wherein the first pixel electrode line and the second pixel electrode line are short-circuited with each other.

11. The device according to claim 1, wherein the common voltages are varied as different polarities from each other within the first and second regions and compensated during a dot inversion operation.

12. An in-plane switching mode liquid crystal display device, comprising:

a plurality of gate lines and data lines; and

a plurality of pixels including a thin film transistor, each pixel having first and second regions, the first region including a first pixel electrode and a first common electrode arranged in parallel for generating a horizontal electric field as a first data voltage and a common voltage are applied thereto, the second region including a second pixel electrode and a second common electrode for forming the horizontal electric field as a second data voltage and a common voltage are applied thereto.

13. The device according to claim 12, wherein the first data voltage and the second data voltage are supplied through the thin film transistors of the corresponding pixel and of an adjacent pixel.

14. The device according to claim 13, wherein the first data voltage and the second data voltage have opposite polarities from each other during a dot inversion driving method.

15. The device according to claim 14, wherein variations of the common voltages are generated as different polarities from each other within the first and second regions.

16. A method of fabricating an in-plane switching mode liquid crystal display device, comprising:

forming a plurality of gate lines and data lines defining a plurality of pixel areas including at least first and second regions on a substrate;

forming a driving device for supplying a signal to adjacent pixel areas;

forming a plurality of pixel electrodes within the first and second regions within the pixel area, the pixel electrode being supplied a first data voltage from the driving device of the corresponding pixel to the first region and being supplied a second voltage from the driving device of an adjacent pixel within the second region; and

forming a plurality of common electrodes within the first and second regions of the pixel areas for forming a horizontal electric field together with the pixel electrode.

17. The method according to claim 16, wherein forming the driving device includes forming a thin film transistor.

18. The method according to claim 17, wherein forming the thin film transistor comprises:

forming a gate line;

forming a gate insulating layer on the gate line;

forming a semiconductor layer on the gate insulating layer; and

forming a data line and a drain electrode on the semiconductor layer.

19. The method according to claim 18, wherein the drain electrode is connected to the pixel electrode of an adjacent pixel.

20. The method according to claim 19, wherein the common electrode and the pixel electrode are formed on a same layer.

21. The method according to claim 20, wherein the common electrode and the pixel electrode are formed on one of the substrate, the gate insulating layer, and a passivation layer.

22. The method according to claim 20, wherein the common electrode is formed on the substrate and the pixel electrode is disposed on the gate insulating layer.

23. The method according to claim 20, wherein the common electrode is formed on the gate insulating layer and the pixel electrode is formed on the substrate.

24. The method according to claim 16, further comprising:

forming a common line within the pixel and connected to the common electrode;

forming a first pixel electrode line overlapping the common line and connected to the pixel electrode within the first region; and

forming a second pixel electrode line connected to the pixel electrode within the second region.

25. The method according to claim 24, wherein the first pixel electrode line and the second pixel electrode line are formed to be short-circuited with each other.

26. The method according to claim 16, wherein the common voltages are varied as different polarities from each other within the first and second regions and compensated during a dot inversion operation.

27. A method of fabricating an in-plane switching mode liquid crystal display device, comprising:

forming a plurality of gate lines and data lines on a substrate; and

forming a plurality of pixels including a thin film transistor, each pixel having first and second regions, the first region including a first pixel electrode and a first common electrode arranged in parallel for generating a horizontal electric field as a first data voltage and a common voltage are applied thereto, the second region including a second pixel electrode and a second common electrode for forming the horizontal electric field as a second data voltage and a common voltage are applied thereto.

28. The method according to claim 27, wherein the first data voltage and the second data voltage are supplied through the thin film transistors of the corresponding pixel and of an adjacent pixel.

29. The method according to claim 27, wherein the first data voltage and the second data voltage have opposite polarities from each other during a dot inversion driving method.

30. The device according to claim 27, wherein variations of the common voltages are generated as different polarities from each other within the first and second regions.