In-plane switching mode liquid crystal display device

• US 6,798,482 B2
• Filed: 09/18/2001
• Issued: 09/28/2004
• 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: Ahn, Young Soo, Shin, Hyun Ho, Park, Jong Jin, Ham, Yong Sung, Seo, Seong Moh
• Primary Examiner(s): TON, MINH TOAN T
• Application Number:
  US09/954,031
• Publication Number:
  US 20020159015A1
• Time in Patent Office: 1,106 Days
• Field of Search: 349/139, 349/141, 349/106, 349/110, 349/123
• 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 gate bus line and a data bus line on the first substrate and defining a unit pixel, the unit pixel being divided into a plurality of sub-pixels, wherein the sub-pixels substantially form a lozenge shape, and wherein alignment directions between sub-pixels are different from each other;

a pair of electrodes in each of the sub-pixels, the electrodes being at an angle with respect to the data bus line and being substantially symmetrical to an adjacent sub-pixel, wherein the pair of electrodes are substantially parallel and have substantially the same angle with respect to the data bus line; and

a liquid crystal layer between the first and second substrates.

2. The device of claim 1, wherein the unit pixel is divided into at least two sub-pixels.

3. The device of claim 2, wherein the at least two sub-pixels have electrodes in different directions.

4. The device of claim 3, wherein the different directions are substantially perpendicular directions.

5. The device of claim 3, wherein the different directions are substantially parallel directions.

6. The device of claim 1, wherein the pair of electrodes includes a data electrode and a common electrode.

7. The device of claim 1, wherein the angle is about 20 degrees.

8. The device of claim 1, wherein the electrodes being at the angle prevents color shift.

9. The device of claim 1, further comprising:

a thin film transistor at a crossing point of the gate and data bus lines;

a common line in the unit pixel;

a passivation layer on the first substrate; and

a first alignment layer on the passivation layer.

10. The device of claim 1, further comprising:

a black matrix layer on the second substrate;

a color filter layer on the second substrate; and

a second alignment layer on the color filter layer.

11. The device of claim 10, wherein the black matrix layer includes one of CrOx and a black resin.

12. A method of forming a liquid crystal display device comprising:

forming a gate bus line and a data bus line on a first substrate and defining a unit pixel, the unit pixel being divided into a plurality of sub-pixels, wherein the sub-pixels substantially form a lozenge shape, and wherein alignment directions between sub-pixels are different from each other;

forming a pair of electrodes in each of the sub-pixels, the electrodes being at an angle with respect to the data bus line and being substantially symmetrical to an adjacent sub-pixel, wherein the pair of electrodes are substantially parallel and have substantially the same angle with respect to the data bus lien; and

forming a liquid crystal layer between the first substrate and the second substrate.

13. The method of claim 12, wherein the unit pixel is divided into at least two sub-pixels.

14. The method of claim 13, wherein the at least two sub-pixels have electrodes in different directions.

15. The method of claim 14, wherein the different directions are substantially perpendicular directions.

16. The device of claim 15, wherein the electrodes being at the angle prevents gray inversion.

17. The method of claim 14, wherein the different directions are substantially parallel directions.

18. The method of claim 12, wherein the pair of electrodes includes a data electrode and a common electrodes.

19. The method of claim 12, wherein the angle is about 20 degrees.

20. The method of claim 12, wherein the electrodes being at the angle prevents color shift.

21. The method of claim 12, wherein the electrodes being at the angle prevents gray inversion.

22. The method of claim 12, further comprising:

forming a thin film transistor at a crossing point of the gate and data bus lines;

forming a common line in the unit pixel;

forming a passivation layer on the first substrate; and

forming a first alignment layer on the passivation layer.

23. The method of claim 12, further comprising:

forming a black matrix layer on the second substrate;

forming a color filter layer on the second substrate; and

forming a second alignment layer on the color filter layer.

24. The method of claim 23, wherein the black matrix layer includes one of CrOx and a black resin.