LIQUID CRYSTAL DISPLAY DEVICE AND SEMICONDUCTOR DEVICE

• US 20070284627A1
• Filed: 05/09/2007
• Published: 12/13/2007
• Est. Priority Date: 05/16/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KIMURA, Hajime
• Granted Patent: US 7,816,682 B2
• Time in Patent Office: Days
• US Class Current: 257/257
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• 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 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136 Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit G02F1/135 takes precedence
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/13685 Top gates
• CPC Class Codes: G02F 2201/121 common or background

Abstract

By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode.

Claims

1. A semiconductor device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a semiconductor film formed over the first insulating film;

a second insulating film formed over the semiconductor film;

a conductive film formed over the second insulating film;

a third insulating film formed over the conductive film; and

a second electrode formed over the third insulating film and including an opening.

2. The semiconductor device according to claim 1, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

3. The semiconductor device according to claim 1, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

4. An electronic device comprising the semiconductor device according to claim 1.

5. A semiconductor device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a conductive film formed over the first insulating film;

a semiconductor film formed over the conductive film;

a second insulating film formed over the semiconductor film; and

a second electrode formed over the second insulating film and including an opening.

6. The semiconductor device according to claim 5, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

7. The semiconductor device according to claim 5, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

8. An electronic device comprising the semiconductor device according to claim 5.

9. A liquid crystal display device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a semiconductor film formed over the first insulating film;

a second insulating film formed over the semiconductor film;

a conductive film formed over the second insulating film;

a third insulating film formed over the conductive film;

a second electrode formed over the third insulating film and including an opening; and

a liquid crystal provided over the second electrode,

wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.

10. The liquid crystal display device according to claim 9, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

11. The liquid crystal display device according to claim 9, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

12. An electronic device comprising the liquid crystal display device according to claim 9.

13. A liquid crystal display device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a conductive film formed over the first insulating film;

a semiconductor film formed over the conductive film;

a second insulating film formed over the semiconductor film;

a second electrode formed over the second insulating film and including an opening; and

a liquid crystal provided over the second electrode,

wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.

14. The liquid crystal display device according to claim 13, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

15. The liquid crystal display device according to claim 13, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

16. An electronic device comprising the liquid crystal display device according to claim 13.

17. A liquid crystal display device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a thin film transistor formed over the first insulating film;

a second insulating film formed over the thin film transistor;

a conductive film formed over the second insulating film;

a third insulating film formed over the conductive film;

a second electrode formed over the third insulating film and including an opening; and

a liquid crystal provided over the second electrode,

wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.

18. The liquid crystal display device according to claim 17, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

19. The liquid crystal display device according to claim 17, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

20. An electronic device comprising the liquid crystal display device according to claim 17.

21. A liquid crystal display device comprising:

a first electrode formed over a substrate;

a first insulating film formed over the first electrode;

a thin film transistor formed over the first insulating film;

a second insulating film formed over the thin film transistor;

a second electrode formed over the second insulating film and including an opening; and

a liquid crystal provided over the second electrode,

wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.

22. The liquid crystal display device according to claim 21, wherein the first electrode is a common electrode and the second electrode is a pixel electrode.

23. The liquid crystal display device according to claim 21, wherein the first electrode is a pixel electrode and the second electrode is a common electrode.

24. An electronic device comprising the liquid crystal display device according to claim 21.