In-plane switching mode liquid crystal display device

• US 6,297,866 B1
• Filed: 09/08/1998
• Issued: 10/02/2001
• Est. Priority Date: 09/08/1997
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Shin, Hyun Ho, Park, Jong Jin, Ham, Yong Sung, Ahn, Young Soo, Seo, Seong Moh
• Primary Examiner(s): Dudek, James A.
• Application Number:
  US09/149,746
• Time in Patent Office: 1,120 Days
• Field of Search: 349/141, 349/43, 349/143
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

An in-plane switching mode liquid crystal display device includes first and second opposed substrates having inner surfaces in which a liquid crystal layer formed therebetween, a data bus line and a gate bus line arranged perpendicularly and/or horizontally in a matrix on the first substrate thereby defining a unit pixel region, and a pair of data electrode and common electrode applying a plane electric field in the liquid crystal layer, the electrodes being inclined with respect to the data bus line and parallel to each other.

Claims

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

first and second substrates;

a data bus line and a gate bus line arranged in a matrix on said first substrate and defining a unit pixel, said unit pixel being divided into a plurality of sub-pixels the sub-pixels being controlled by a switching unit;

a plurality of electrodes in each of the sub-pixels, the plurality of electrodes applying a plane electric field in said liquid crystal, the electrodes being at an angle with respect to said data bus line and substantially parallel to each other; and

a liquid crystal layer between said first and second substrates.

2. The in-plane switching mode liquid crystal display device according to claim 1, further comprising:

a thin film transistor (TFT) adjacent a cross point of said gate and data bus lines;

a common line in said pixel region;

a passivation layer on said TFT; and

a first alignment layer on said passivation layer.

3. The in-plane switching mode liquid crystal display device according to claim 2, further comprising:

a black matrix for preventing light from leaking around said TFT, said gate bus line, and said data bus line;

a color filter layer on said second substrate; and

a second alignment layer on said color filter layer.

4. The in-plane switching mode liquid crystal display device according to claim 2, wherein said angle θ

is about 20 degrees.

5. The in-plane switching mode liquid crystal display device according to claim 1, wherein said pair of electrodes includes a data electrode and a common electrode.

6. The in-plane switching mode liquid crystal display device according to claim 1, wherein said angle θ

is about 20 degrees.

7. The in-plane switching mode liquid crystal display device according to claim 1, wherein the sub-pixels are each defined by the data bus line and the gate bus line.

8. The in-plane switching mode liquid crystal display device according to claim 1, wherein said unit pixel region is divided into four sub-pixel regions.

9. The in-plane switching mode liquid crystal display device according to claim 8, wherein said angle θ

is about 20 degrees.

10. The in-plane switching mode liquid crystal display device according to claim 1, wherein the electrodes being at said angle θ

prevents color shift.

11. The in-plane switching mode liquid crystal display device according to claim 10, wherein the electrodes being at said angle θ

prevents gray inversion.

12. The in-plane switching mode liquid crystal display device according to claim 1, wherein at least two of the sub-pixels have electrodes in different directions.

13. The in-plane switching mode liquid crystal display device according to claim 12, wherein the different directions are substantially perpendicular directions.

14. The in-plane switching mode liquid crystal display device according to claim 12, wherein the different directions are substantially parallel directions.

15. The in-plane switching mode liquid crystal display device according to claim 1, wherein the sub-pixels are four regions substantially forming a four-sided shape, each of the four regions providing a side for the four-sided shape.

16. The in-plane switching mode liquid crystal display device according to claim 15, wherein the four-sided shape is a lozenge shape.

17. A method of forming a liquid crystal display device having first and second substrates comprising the steps of:

forming a data bus line and a gate bus line arranged in a matrix on said first substrate and defining a unit pixel, said unit pixel being divided into a plurality of sub-pixels, the sub-pixels being controlled by a switching unit;

forming a plurality of electrodes in each of the sub-pixels for applying a plane electric field in said liquid crystal, the electrodes being at an angle with respect to said data bus line and substantially parallel to each other; and

forming a liquid crystal layer between said first and second substrates.

18. The method according to claim 17, further comprising the steps of:

forming a thin film transistor (TFT) adjacent a cross point of said gate and data bus lines;

forming a common line in said pixel region;

forming a passivation layer on said TFT; and

forming a first alignment layer on said passivation layer.

19. The method according to claim 18, further comprising the steps of:

forming a black matrix for preventing light from leaking around said TFT, said gate bus line, and said data bus line;

forming a color filter layer on said second substrate; and

forming a second alignment layer on said color filter layer.

20. The method according to claim 18, wherein said angle θ

is about 20 degrees.

21. The method according to claim 17, wherein said pair of electrodes includes a data electrode and a common electrode.

22. The method according to claim 17, wherein said angle θ

is about 20 degrees.

23. The method according to claim 17, wherein said unit pixel region is divided into four sub-pixel regions.

24. The method according to claim 23, wherein said angle θ

is about 20 degrees.

25. The method according to claim 17, wherein the sub-pixel regions are each defined by the data bus line and the gate bus line.

26. The method according to claim 17, wherein at least two of the sub-pixels have electrodes in different directions.

27. The method according to claim 26, wherein the different directions are substantially perpendicular directions.

28. The method according to claim 26, wherein the different directions are substantially parallel directions.

29. The method according to claim 17, wherein the sub-pixels are four regions substantially forming a four-sided shape, each of the four regions providing a side for the four-sided shape.

30. The method according to claim 29, wherein the four side shape is a lozenge shape.

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

first and second substrates;

a data bus line and a gate bus line arranged in a matrix on said first substrate and defining a unit pixel, said unit pixel being divided into a plurality of sub-pixels, the sub-pixels being controlled by a switching unit;

a plurality of electrodes in each of the sub-pixels for applying a plane electric field in said liquid crystal, the electrodes being at an angle with respect to said data bus line and substantially parallel to each other;

a liquid crystal layer between said first and second substrates;

a thin film transistor (TFT) adjacent a cross point of said gate and data bus lines;

a common line in said pixel;

a passivation layer on said TFT;

a first aliment layer on said passivation layer;

a black matrix for preventing light from leaking around said TFT, said gate bus line, and

said data bus line;

a color filter layer on said second substrates; and

a second alignment layer on said color filter layer.

32. The in-plane switching mode liquid crystal display device according to claim 31, wherein said angle θ

is about 20 degrees.

33. The in-plane switching mode liquid crystal display device according to claim 31, wherein said unit pixel region is divided into four sub-pixel regions.

34. The in-plane switching mode liquid crystal display device according to claim 31, wherein the sub-pixels are each defined by the data bus line and the gate bus line.

35. The in-plane switching mode liquid crystal display device according to claim 31, wherein at least two of the sub-pixels have electrodes in different directions.

36. The in-plane switching mode liquid crystal display device according to claim 35, wherein the different directions are substantially perpendicular directions.

37. The in-plane switching mode liquid crystal display device according to claim 35, wherein the different directions are substantially parallel directions.

38. The in-plane switching mode liquid crystal display device according to claim 31, wherein the sub-pixels are four regions substantially forming a four-sided shape, each of the four regions providing a side for the four-sided shape.

39. The in-plane switching mode liquid crystal display device according to claim 38, wherein the four-sided shape is a lozenge shape.