Granted Patent B2

US 8,368,830 · App. 13/550,330 · Granted Feb 5, 2013

Abstract

Claims (32)

1. A liquid crystal display device comprising:

a liquid crystal display panel having a first substrate, a second substrate, and a liquid crystal held between the first substrate and the second substrate, the liquid crystal display panel having multiple pixels arranged in matrix, a thin film transistor which each of the multiple pixels has, a signal line connected with a drain electrode of the thin film transistor, a gate line connected with a gate electrode of the thin film transistor; and

a display area provided in at least part of each of the pixels, wherein

the display area has a laminated structure containing a first electrode, a first insulating film, a second electrode, a second insulating film, and a third electrode which are laminated in this order with the first electrode closest to the first substrate,

the first electrode is formed in a rectangular shape and substantially covers the display area in a plan view,

the second electrode is formed in a rectangular shape and substantially covers the display area in a plan view,

the second electrode is connected with a source electrode of the thin film transistor without passing through the first insulating film,

the second electrode has a first region which overlaps with the first electrode and a second region which does not overlap with the first electrode,

the second region is disposed at a side of the drain line in the second electrode, and protrudes from the first region in a direction where the gate line extends,

the first electrode and the second electrode are electrically insulated from each other and together form a first storage capacitor through the first insulating film, and

the second electrode and the third electrode are electrically insulated from each other and together form a second storage capacitor through the second insulating film.

2. A liquid crystal display device according to claim 1 , wherein a part of the second electrode is disposed between the first insulating film and the source electrode.

3. A liquid crystal display device according to claim 2 , wherein the part of the second electrode is connected with the source electrode without a contact hole.

4. A liquid crystal display device according to claim 1 , wherein a part of the second electrode is disposed on an upper surface of the source electrode, the upper surface being opposite to the first insulating film.

5. A liquid crystal display device according to claim 4 , wherein the part of the second electrode is connected with the upper surface without a contact hole.

6. A liquid crystal display device according to claim 1 , wherein the first electrode is formed at the same layer of the gate electrode.

7. A liquid crystal display device according to claim 1 , wherein the first insulating film is a gate insulating film of the thin film transistor.

8. A liquid crystal display device according to claim 1 , wherein the second electrode has further a third region which does not overlap with the first electrode,

the third region is disposed at an opposite side of the second region in the second electrode.

9. A liquid crystal display device according to claim 1 , wherein the third electrode has multiple comb-teeth electrodes, and

the liquid crystal display device generates an electric field that has a component parallel to a surface of the first substrate between the third electrode and the second electrode, and uses the electric field to drive a liquid crystal on the surface side of the third electrode.

10. A liquid crystal display device according to claim 1 , wherein the third electrode has a shape of a flat board with a slit, and

the liquid crystal display device generates an electric field that has a component parallel to a surface of the first substrate between the third electrode and the second electrode, and uses the electric field to drive a liquid crystal on the surface side of the third electrode.

11. A liquid crystal display device according to claim 1 , wherein the third electrode comprises a counter electrode,

the second electrode comprises a pixel electrode, and

the first electrode comprises a storage capacitor electrode.

12. A liquid crystal display device according to claim 11 , wherein the third electrode is connected to a common electrode wiring line, and

the first electrode is connected to a storage capacitor wiring line.

13. A liquid crystal display device according to claim 12 , wherein a voltage of the common electrode wiring line is equal to a voltage of the storage capacitor wiring line.

14. A liquid crystal display device according to claim 12 , wherein a voltage of the common electrode wiring line is different from a voltage of the storage capacitor wiring line.

15. A liquid crystal display device according to claim 12 , wherein a part of the first electrode is connected with a lower surface of the storage capacitor wiring line.

16. A liquid crystal display device according to claim 15 , wherein the part of the first electrode is connected with the lower surface without a contact hole.

Assignments (9)