Display device and method for fabricating the same

• US 20010017372A1
• Filed: 02/23/2001
• Published: 08/30/2001
• Est. Priority Date: 02/29/2000
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Koyama, Jun
• Granted Patent: US 7,612,753 B2
• Time in Patent Office: Days
• US Class Current: 257/72
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• 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 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• 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
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/35 : comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 77/111 : Flexible substrates
• CPC Class Codes: Y02E 10/549 : Organic PV cells
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

An inexpensive display device, as well as an electrical apparatus employing the same, can be provided. In the display device in which a pixel section and a driver circuit are included on one and the same insulating surface, the driver circuit includes a decoder 100 and a buffer section 101. The decoder 100 includes a plurality of NAND circuits each including p-channel TFTs 104 to 106 connected to each other in parallel and other p-channel TFTs 107 to 109 connected to each other in series. The buffer section 101 includes a plurality of buffers each including three p-channel TFTs 114 to 116.

Claims

1. A display device, comprising:

a gate wiring; and

a source wiring that is formed on the same surface by the same conductive film as said gate wiring,

wherein said gate wiring overpasses said source wiring via a connecting wiring, and

wherein said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

17. A display device according to any one of

claims 1

to

4

, wherein said connecting wiring is formed in a layer different from said gate wiring and said source wiring.

18. A display device according to any one of

claims 1

to

4

, wherein said connecting wiring is made of a transparent conductive film.

19. A display device according to any one of

claims 1

to

4

, wherein each of a switching TFT, electrically connected to said source wiring, and said current-controlling TFT are p-channel TFTs.

20. A display device according to any one of

claims 1

to

9

, wherein said display device is a light-emitting device.

21. A display device according to any one of

claims 1

to

9

, wherein said display device is a liquid crystal display device.

22. A display device according to any one of

claims 1

to

9

, wherein said display device is incorporated into an electric equipment selected from said group consisting of a video camera, a digital camera, a goggle type display, a navigation system, an audio playback device, a notebook type personal computer, a game apparatus, a portable information terminal, and an image playback device equipped with a recording medium.

2. A display device, comprising:

a gate wiring; and

a source wiring that is formed on the same surface by the same conductive film as said gate wiring,

wherein said source wiring overpasses said gate wiring via a connecting wiring, and

wherein said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

3. A display device, comprising:

a gate wiring; and

a source wiring and a current supply line that are formed on the same surface by the same conductive film as said gate wiring,

wherein said gate wiring overpasses said source wiring and said current supply line via a connecting wiring, and

wherein said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

4. A display device, comprising:

a gate wiring; and

a source wiring and a current supply line that are formed on the same surface by the same conductive film as said gate wiring,

wherein said source wiring overpasses said source wiring and said current supply line via a connecting wiring, and

wherein said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

5. A display device, comprising:

a pixel section and a driver circuit that are formed on an insulating surface;

wherein said driver circuit comprises a decoder including a plurality of NAND circuits each formed of a TFT of one conductivity type.

10. A display device according to any one of

claims 5

to

9

, wherein a source wiring and a drain wiring of said TFT is made of a transparent conductive film.

11. A display device according to any one of

claims 5

to

9

, wherein said TFT of said one conductivity type is a p-channel TFT.

12. A display device according to any one of

claims 5

to

9

, wherein said TFT of said one conductivity type is an n-channel TFT.

13. A display device according to any one of

claims 5

to

9

, wherein said pixel section comprises:

a gate wiring; and

a source wiring that is formed on the same surface by the same conductive film as said gate wiring,

wherein said gate wiring overpasses said source wiring via a connecting wiring, and

said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

14. A display device according to any one of

claims 5

to

9

, wherein said pixel section comprises:

a gate wiring; and

a source wiring that is formed on the same surface by the same conductive film as said gate wiring,

wherein said source wiring overpasses said gate wiring via a connecting wiring, and

said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

15. A display device according to any one of

claims 5

to

9

, wherein said pixel section comprises:

a gate wiring; and

a source wiring, and a current supply line that are formed on the same surface by the same conductive film as said gate wiring,

wherein said gate wiring, overpasses said source wiring and said current supply line via a connecting wiring, and

said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

16. A display device according to any one of

claims 5

to

9

, wherein said pixel section comprises:

a gate wiring; and

a source wiring and a current supply line that are formed on the same surface by the same conductive film as said gate wiring,

wherein said source wiring overpasses said gate wiring and said current supply line via a connecting wiring, and

said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

6. A display device, comprising:

a pixel section and a driver circuit that are formed on an insulating surface;

wherein said driver circuit comprises a decoder including a plurality of NAND circuits each formed of a TFT of one conductivity type, and

each of said NAND circuits comprises n TFTs of said one conductivity type connected to each other in series and n TFTs of said one conductivity type connected to each other in parallel.

7. A display device, comprising:

a pixel section and a driver circuit that are formed on an insulating surface;

wherein said driver circuit comprises a buffer formed of TFTs of one conductivity type, and

said buffer comprising;

a first TFT of said one conductivity type; and

a second TFT of said one conductivity type that is connected to said first TFT in series, and utilizes a drain of said first TFT as its gate.

8. A display device, comprising:

a pixel section and a driver circuit that are formed on an insulating surface;

wherein said driver circuit comprises;

a decoder including a plurality of NAND circuits each formed of a TFT of one conductivity type; and

a buffer formed of TFTs of said one conductivity type, and

said buffer comprising;

a first TFT of said one conductivity type; and

a second TFT of said one conductivity type that is connected to said first TFT in series and utilizes a drain of said first TFT as its gate.

9. A display device, comprising:

a pixel section and a driver circuit that are formed on an insulating surface;

wherein said driver circuit comprises;

a decoder including a plurality of NAND circuits each formed of a TFT of one conductivity type; and

a buffer formed of TFTs of said one conductivity type,

each of said NAND circuits comprises n TFTs of said one conductivity type connected to each other in series and n TFTs of said one conductivity type connected to each other in parallel, and

said buffer comprising;

a first TFT of said one conductivity type; and

a second TFT of said one conductivity type that is connected to said first TFT in series and utilizes a drain of said first TFT as its gate.

23. A method for fabricating a display device, comprising the steps of:

forming a semiconductor layer on an insulating surface;

forming a gate insulating film on said semiconductor layer;

forming a source wiring, a gate wiring and a current supply line on said gate insulating film;

forming a p-type semiconductor region in said semiconductor layer;

forming an interlayer insulating layer over said source wiring, said gate wiring and said current supply line;

forming contact holes respectively reaching said source wiring, said p-type semiconductor region, and said current supply line; and

forming a connecting wiring providing electrical connection either between said source wiring and said p-type semiconductor region or between said current supply line and said p-type semiconductor region.

25. A method for fabricating a display device according to

claim 23

or

24

, wherein said connecting wiring is formed on the same surface by the same conductive film as a drain wiring of a current-controlling TFT.

26. A method for fabricating a display device according to any one of claims 23 or 24, wherein said display device is a light-emitting device.

27. A method for fabricating a display device according to any one of claims 23 or 24, wherein said display device is a liquid crystal display device.

28. A method for fabricating a display device according to any one of claims 23 or 24, wherein said display device is incorporated into an electric equipment selected from said group consisting of a video camera, a digital camera, a goggle type display, a navigation system, an audio playback device, a notebook type personal computer, a game apparatus, a portable information terminal, and an image playback device equipped with a recording medium.

24. A method for fabricating a display device, comprising the steps of:

forming a semiconductor layer on an insulating surface;

forming a gate insulating film on said semiconductor layer;

forming a source wiring, a gate wiring and a current supply line on said gate insulating film;

forming a p-type semiconductor region in said semiconductor layer;

forming an interlayer insulating layer over said source wiring, said gate wiring and said current supply line;

forming contact holes respectively reaching said source wiring, said p-type semiconductor region, and said current supply line; and

forming a connecting wiring that overpasses said source wiring and connects a plurality of gate wirings to each other.