In-plane switching mode liquid crystal display device and fabricating method thereof

• US 20060001814A1
• Filed: 06/29/2005
• Published: 01/05/2006
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Paik, Sang Yoon, Nam, Sung-Lim
• Granted Patent: US 8,964,153 B2
• Time in Patent Office: Days
• US Class Current: 349/141
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• 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 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element

Abstract

An in-plane switching mode liquid crystal display device includes a first substrate and a second substrate, a gate line and a data line crossing each other on the first substrate to define a pixel region, a switching device at a crossing of the gate line and the data line, a pixel electrode and a common electrode on the first substrate for generating an in-plane electric field in the pixel region, a black matrix, a light blocking line, the light blocking line being below the black matrix and above the data line, the light blocking line covering a gap between the data line and the common electrode adjacent to the data line, and a liquid crystal layer formed between the first and second substrates.

Claims

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

a first substrate and a second substrate;

a gate line and a data line crossing each other on the first substrate to define a pixel region;

a switching device at a crossing of the gate line and the data line;

a pixel electrode and a common electrode on the first substrate for generating an in-plane electric field in the pixel region;

a black matrix;

a light blocking line, the light blocking line being below the black matrix and above the data line, the light blocking line covering a gap between the data line and the common electrode adjacent to the data line; and

a liquid crystal layer formed between the first and second substrates.

2. The device of claim 1, wherein the common electrode and the pixel electrode have a bent structure.

3. The device of claim 2, wherein the data line has a bent structure.

4. The device of claim 1, wherein at least one of the common electrode and the pixel electrode is formed of a transparent conductive material.

5. The device of claim 4, wherein the transparent conductive material is selected from one of ITO (indium tin oxide) or IZO (indium zinc oxide).

6. The device of claim 1, wherein the light blocking line is integrally formed with the common electrode adjacent to the data line.

7. The device of claim 1, wherein the light blocking line is above the common electrode.

8. The device of claim 1, wherein the data line and the pixel electrode are coplanar.

9. The device of claim 1, wherein the light blocking line and the pixel electrode are coplanar.

10. The device of claim 1, wherein the light blocking line, the common electrode and the pixel electrode are coplanar.

11. The device of claim 1, further comprising:

a common line electrically connected to the common electrode;

a pixel electrode line electrically connected to the pixel electrode; and

a storage capacitor, the common line and the pixel electrode being two electrodes of the storage capacitor.

12. The device of claim 1, further comprising a color filter on the black matrix.

13. A liquid crystal display device comprising:

a first substrate and a second substrate;

a gate line on the first substrate;

a common electrode on the first substrate;

a gate insulation layer over an entire surface of the first substrate and above the gate line and the common electrode;

a data line being above and contacting the gate insulation layer, the data line and the gate line crossing each other on the first substrate to define a pixel region;

a passivation layer over the entire surface of the first substrate and above the data line;

a pixel electrode, the pixel electrode being above and contacting the passivation layer, the pixel electrode and the common electrode being for generating an in-plane electric field in the pixel region;

a light blocking line being above and contacting the passivation layer, the light blocking line covering a gap between the data line and the common electrode adjacent to the data line; and

a liquid crystal layer formed between the first and second substrates.

14. The device of claim 13, wherein the common electrode and the pixel electrode have a bent structure.

15. The device of claim 14, wherein the data line has a bent structure.

16. The device of claim 13, wherein the pixel electrode is formed of a transparent conductive material.

17. The device of claim 16, wherein the transparent conductive material is selected from one of ITO (indium tin oxide) and IZO (indium zinc oxide).

18. The device of claim 13, further comprising:

a common line electrically connected to the common electrode;

a pixel electrode line electrically connected to the pixel electrodes; and

a storage capacitor, the common line and the pixel electrode being two electrodes of the storage capacitor.

19. The device of claim 13, further comprises:

a black matrix above the light blocking line; and

a color filter formed on the black matrix.

20. The device of claim 13, wherein the light blocking line and the pixel electrode are coplanar.

21. A liquid crystal display device comprising:

a first substrate and a second substrate;

a gate line on the first substrate;

a common electrode on the first substrate;

a gate insulation layer over an entire surface of the first substrate and above the gate line and common electrode;

a data line the data line being above and contacting the gate insulation layer, the data line and the gate line crossing each other on the first substrate to define a pixel region;

a pixel electrode, the pixel electrode being above and contacting gate insulation layer, the pixel electrode and the common electrode being for generating an in plane electric field in the pixel region together with the common electrodes;

a passivation layer over the entire surface of the first substrate and above the data line and the pixel electrode;

a light blocking line, the light blocking line being above and contacting the passivation layer, the light blocking line covering a gap between the data line and the common electrode adjacent to the data lines; and

a liquid crystal layer formed between the first and second substrates.

22. The device of claim 21, wherein the data line and the pixel electrode are coplanar.

23. The device of claim 21, further comprises:

a black matrix above the light blocking line; and

a color filter formed on the black matrix.

24. A method for fabricating a liquid crystal display device;

providing a first substrate and a second substrate;

forming a gate line and a data line crossing each other on the first substrate to define a pixel region;

forming a pixel electrode and a common electrode on the first substrate for generating an in-plane electric field in the pixel region;

forming a black matrix;

forming a light blocking line below the black matrix and above the data line, to cover a gap between the data line and the common electrode adjacent to the data lines; and

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

25. The method of claim 24, wherein of the step of forming the pixel electrode includes forming the pixel electrode of a transparent conductive material.

26. The method of claim 24, further comprising forming a gate insulation layer above the common electrode.

27. The method of claim 26, wherein the step of forming the pixel electrode includes forming the pixel electrode above and in contact with the gate insulation layer.

28. The method of claim 27, wherein the step of forming the data line includes forming the data line above and in contact with the gate insulation layer to be coplanar with the pixel electrode.

29. The method of claim 24, further comprising forming a passivation layer above the data line and the pixel electrode.

30. The method of claim 29, wherein the step of forming the light blocking line includes forming the light blocking line above and in contact with the passivation layer.

31. The method of claim 24, further comprising forming a passivation layer above the data line.

32. The method of claim 31, wherein the step of forming the pixel electrode includes forming the pixel electrode above and in contact with the passivation layer.

33. The method of claim 32, wherein the step of forming the light blocking line includes forming the light blocking line above and in contact with the passivation layer to be coplanar with the pixel electrode.

34. The method of claim 31, wherein the steps of forming the common electrode, the pixel electrode and the light block line include forming the common electrode, the pixel electrode and the light block line above and in contact with the passivation layer so that the common electrode, the pixel electrode and the light block line are coplanar.