Liquid crystal display device, semiconductor device, and electronic appliance

• US 9,958,736 B2
• Filed: 12/03/2015
• Issued: 05/01/2018
• Est. Priority Date: 04/06/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime
• Primary Examiner(s): CHANG, CHARLES S
• Application Number:
  US14/957,746
• Publication Number:
  US 20160154283A1
• Time in Patent Office: 880 Days
• Field of Search: 349 42- 47, 349106-108
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• 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: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H01L 29/78696 characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel H01L29/78612 takes precedence; transistors having a drain offset region or a lightly doped drain [LDD] H01L29/78621
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

The liquid crystal display device includes an island-shaped first semiconductor film 102 which is formed over a base insulating film 101 and in which a source 102d, a channel forming region 102a, and a drain 102b are formed; a first electrode 102c which is formed of a material same as the first semiconductor film 102 to be the source 102d or the drain 102b and formed over the base insulating film 101; a second electrode 108 which is formed over the first electrode 102c and includes a first opening pattern 112; and a liquid crystal 110 which is provided over the second electrode 108.

Claims

1. A display device comprising:

a substrate;

a first pixel, a second pixel, and a third pixel over the substrate, each of the first pixel, the second pixel, and the third pixel comprising;

a transistor comprising;

a gate electrode on and in contact with the substrate;

a first insulating film over the gate electrode; and

a compound semiconductor film overlapping with the gate electrode with the first insulating film interposed therebetween, the compound semiconductor film comprising In, Ga, and Zn;

a second insulating film over the compound semiconductor film;

a wiring on and in contact with the second insulating film and electrically connected to the compound semiconductor film;

a first conductive film on and in contact with the second insulating film;

a pixel electrode over the second insulating film and electrically connected to the compound semiconductor film via the first conductive film; and

a capacitor electrically connected to the pixel electrode, the capacitor comprising;

a second conductive film on and in contact with the substrate;

the second insulating film over the second conductive film; and

a third conductive film on and in contact with the second insulating film and overlapping with the second conductive film with the second insulating film interposed therebetween,

wherein the second insulating film comprises silicon oxide,

wherein the first pixel comprises a red color filter between the second insulating film and the pixel electrode of the first pixel,

wherein the second pixel comprises a green color filter between the second insulating film and the pixel electrode of the second pixel,

wherein the third pixel comprises a blue color filter between the second insulating film and the pixel electrode of the third pixel, and

wherein the red color filter overlaps with the compound semiconductor film in each of the first pixel, the second pixel, and the third pixel.

2. The display device according to claim 1, wherein the wiring is a source wiring.

3. The display device according to claim 1, wherein the second conductive film is an auxiliary wiring.

4. The display device according to claim 1, comprising:

an alignment film over the pixel electrode; and

a liquid crystal over the alignment film.

5. The display device according to claim 1, wherein each of the red color filter, the green color filter, and the blue color filter is on and in contact with the second insulating film.

6. The display device according to claim 1,

wherein the pixel electrode of the first pixel is on and in contact with the red color filter,

wherein the pixel electrode of the second pixel is on and in contact with the green color filter, and

wherein the pixel electrode of the third pixel is on and in contact with the blue color filter.

7. The display device according to claim 1, wherein the pixel electrode is on and in contact with the first conductive film.

8. The display device according to claim 1, wherein the pixel electrode is electrically connected to the third conductive film.

9. The display device according to claim 1, wherein the pixel electrode comprises a slit.

10. The display device according to claim 1, comprising a common electrode on and in contact with the first insulating film.

11. The display device according to claim 1, wherein the second insulating film is an interlayer insulating film.

12. A display device comprising:

a substrate;

a first pixel, a second pixel, and a third pixel over the substrate, each of the first pixel, the second pixel, and the third pixel comprising;

a transistor comprising;

a gate electrode on and in contact with the substrate;

a first insulating film over the gate electrode; and

a compound semiconductor film overlapping with the gate electrode with the first insulating film interposed therebetween, the compound semiconductor film comprising In, Ga, and Zn;

a second insulating film over the compound semiconductor film;

a wiring on and in contact with the second insulating film and electrically connected to the compound semiconductor film;

a first conductive film on and in contact with the second insulating film;

a pixel electrode over the second insulating film and electrically connected to the compound semiconductor film via the first conductive film; and

a capacitor electrically connected to the pixel electrode, the capacitor comprising;

a second conductive film on and in contact with the substrate;

the second insulating film over the second conductive film; and

a third conductive film on and in contact with the second insulating film and overlapping with the second conductive film with the second insulating film interposed therebetween,

wherein the compound semiconductor film comprises an impurity region

wherein the second insulating film comprises silicon oxide,

wherein the first pixel comprises a red color filter between the second insulating film and the pixel electrode of the first pixel,

wherein the second pixel comprises a green color filter between the second insulating film and the pixel electrode of the second pixel,

wherein the third pixel comprises a blue color filter between the second insulating film and the pixel electrode of the third pixel, and

wherein the red color filter overlaps with the compound semiconductor film in each of the first pixel, the second pixel, and the third pixel.

13. The display device according to claim 12, wherein the wiring is a source wiring.

14. The display device according to claim 12, wherein the second conductive film is an auxiliary wiring.

15. The display device according to claim 12, comprising:

an alignment film over the pixel electrode; and

a liquid crystal over the alignment film.

16. The display device according to claim 12, wherein each of the red color filter, the green color filter, and the blue color filter is on and in contact with the second insulating film.

17. The display device according to claim 12,

wherein the pixel electrode of the first pixel is on and in contact with the red color filter,

wherein the pixel electrode of the second pixel is on and in contact with the green color filter, and

wherein the pixel electrode of the third pixel is on and in contact with the blue color filter.

18. The display device according to claim 12, wherein the pixel electrode is on and in contact with the first conductive film.

19. The display device according to claim 12, wherein the pixel electrode is electrically connected to the third conductive film.

20. The display device according to claim 12, wherein the pixel electrode comprises a slit.

21. The display device according to claim 12, comprising a common electrode on and in contact with the first insulating film.

22. The display device according to claim 12, wherein the second insulating film is an interlayer insulating film.

23. A display device comprising:

a substrate;

a first pixel, a second pixel, and a third pixel over the substrate, each of the first pixel, the second pixel, and the third pixel comprising;

a transistor comprising;

a first compound semiconductor film comprising In, Ga, and Zn;

a first insulating film over the first compound semiconductor film; and

a gate electrode overlapping with the first compound semiconductor film with the first insulating film interposed therebetween;

a second insulating film over the gate electrode;

a wiring on and in contact with the second insulating film and electrically connected to the first compound semiconductor film;

a first conductive film on and in contact with the second insulating film;

a pixel electrode over the second insulating film and electrically connected to the first compound semiconductor film via the first conductive film; and

a capacitor electrically connected to the pixel electrode, the capacitor comprising a second compound semiconductor film,

wherein the second insulating film comprises silicon oxide,

wherein the first pixel comprises a red color filter between the second insulating film and the pixel electrode of the first pixel,

wherein the second pixel comprises a green color filter between the second insulating film and the pixel electrode of the second pixel,

wherein the third pixel comprises a blue color filter between the second insulating film and the pixel electrode of the third pixel, and

wherein the red color filter overlaps with the first compound semiconductor film in each of the first pixel, the second pixel, and the third pixel.

24. The display device according to claim 23, wherein the first compound semiconductor film comprises an impurity region.

25. The display device according to claim 23, wherein the wiring is a source wiring.

26. The display device according to claim 23, comprising:

an alignment film over the pixel electrode; and

a liquid crystal over the alignment film.

27. The display device according to claim 23, wherein each of the red color filter, the green color filter, and the blue color filter is on and in contact with the second insulating film.

28. The display device according to claim 23,

wherein the pixel electrode of the first pixel is on and in contact with the red color filter,

wherein the pixel electrode of the second pixel is on and in contact with the green color filter, and

wherein the pixel electrode of the third pixel is on and in contact with the blue color filter.

29. The display device according to claim 23, wherein the pixel electrode is on and in contact with the first conductive film.

30. The display device according to claim 23, wherein the pixel electrode comprises a slit.

31. The display device according to claim 23, comprising a common electrode on and in contact with the first insulating film.

32. The display device according to claim 23, wherein the second insulating film is an interlayer insulating film.