Liquid crystal display device

1. A liquid crystal display device comprising:

a first substrate including a gate line extending in a first direction, a source line extending in a second direction crossing the first direction, a first common electrode opposed to the gate line and the source line, an interlayer insulating film covering the first common electrode, a pixel electrode including a main pixel electrode extending in the second direction and a sub-pixel electrode extending in the first direction, the pixel electrode formed on the interlayer insulating film, a second common electrode formed on the interlayer insulating film and having a same potential as the first common electrode, and a first alignment film covering the pixel electrode and the second common electrode;

a second substrate including a second alignment film opposed to the first alignment film; and

a liquid crystal layer held between the first substrate and the second substrate,

the second common electrode including a second main common electrode which is opposed to the source line and has intermittence at a position adjacent to the sub-pixel electrode, and a second sub-common electrode which crosses the second main common electrode and has intermittence at a position adjacent to the main pixel electrode.

2. The liquid crystal display device of claim 1 , wherein the second common electrode is in contact with the first common electrode via a contact hole which penetrates the interlayer insulating film at a position where the second main common electrode and the second sub-common electrode cross each other.

3. The liquid crystal display device of claim 1 , wherein the second substrate includes a third common electrode, which is opposed to the second common electrode, is covered with the second alignment film, and has a same potential as the second common electrode.

4. The liquid crystal display device of claim 1 , wherein the interlayer insulating film is formed of an inorganic material.

5. The liquid crystal display device of claim 1 , wherein the first substrate further includes an organic insulating film between the gate and source lines and the first common electrode.

6. The liquid crystal display device of claim 1 , wherein the first common electrode extends in the first direction beyond the source line, and also extends in the second direction beyond the gate line.

7. A liquid crystal display device comprising:

a first substrate including a gate line extending in a first direction, a source line extending in a second direction crossing the first direction, a first common electrode opposed to the gate line and the source line, an interlayer insulating film covering the first common electrode, a pixel electrode including a main pixel electrode extending in the second direction and a sub-pixel electrode extending in the first direction, the pixel electrode formed on the interlayer insulating film, a second common electrode formed on the interlayer insulating film and having a same potential as the first common electrode, and a first alignment film covering the pixel electrode and the second common electrode;

a second substrate including a second alignment film opposed to the first alignment film; and

a liquid crystal layer held between the first substrate and the second substrate,

the second common electrode including a plurality of segments each formed in an island shape and disposed around the pixel electrode.

8. The liquid crystal display device of claim 7 , wherein each of the segments is in contact with the first common electrode via a contact hole which penetrates the interlayer insulating film.

9. The liquid crystal display device of claim 7 , wherein each of the segments is formed in a cross shape or formed to be T-shaped.

10. The liquid crystal display device of claim 7 , wherein four of the segments are disposed around the pixel electrode.

11. The liquid crystal display device of claim 10 , wherein four of the segments are identical in shape.

12. The liquid crystal display device of claim 7 , wherein the second substrate includes a third common electrode, which is opposed to the second common electrode, is covered with the second alignment film, and has a same potential as the second common electrode.

13. The liquid crystal display device of claim 7 , wherein the interlayer insulating film is formed of an inorganic material.

14. The liquid crystal display device of claim 7 , wherein the first substrate further includes an organic insulating film between the gate and source lines and the first common electrode.

15. The liquid crystal display device of claim 7 , wherein the first common electrode extends in the first direction beyond the source line, and also extends in the second direction beyond the gate line.

16. A display device comprising:

a first substrate including a gate line, a source line, a first common electrode opposed to the gate line and the source line, an interlayer insulating film covering the first common electrode, a second common electrode formed on the interlayer insulating film and having a same potential as the first common electrode;

wherein the second common electrode is opposed to the source line and is in contact with the first common electrode via a contact hole which penetrates the interlayer insulating film.

17. The display device of claim 16 , further comprising a pixel electrode, wherein the pixel electrode is formed on the interlayer insulating film.

18. The display device of claim 17 , further comprising a switching element connected to the gate line and the source line, wherein the second common electrode includes a gap portion which is not opposed to the source line at a place near a contact portion between the pixel electrode and the switching element.

19. The display device of claim 16 , wherein the second common electrode includes a gap portion which is not opposed to the source line at an intersection area between the gate line and the source line.