Display device including pixel comprising first transistor second transistor and light-emitting element

Patent metadata

Field	Value
Publication number	US-9780124-B2
Application number	US-201615221642-A
Country	US
Kind code	B2
Filing date	Jul 28, 2016
Priority date	Apr 27, 2000
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An active matrix display device having a pixel structure in which pixel electrodes, gate wirings and source wirings are suitably arranged in the pixel portions to realize a high numerical aperture without increasing the number of masks or the number of steps. The device comprises a gate electrode and a source wiring on an insulating surface, a first insulating layer on the gate electrode and on the source wiring, a semiconductor layer on the first insulating film, a second insulating layer on the semiconductor film, a gate wiring connected to the gate electrode on the second insulating layer, a connection electrode for connecting the source wiring and the semiconductor layer together, and a pixel electrode connected to the semiconductor layer.

First claim

What is claimed is:

1. A display device including a pixel, the pixel comprising:
a first transistor;
a second transistor;
a light-emitting element,
a first wiring;
a second wiring; and
a third wiring,
wherein one of a source and a drain of the first transistor is electrically connected to the first wiring,
wherein a gate of the first transistor is electrically connected to the second wiring,
wherein one of a source and a drain of the second transistor is electrically connected to a pixel electrode,
wherein the other one of the source and the drain of the second transistor is electrically connected to the third wiring,
wherein the first wiring comprises a first portion and a second portion,
wherein the second wiring comprises a third portion and a fourth portion,
wherein the third wiring comprises a fifth portion,
wherein the first portion and the third portion are positioned on a first insulating surface, and
wherein the second portion, the fourth portion, and the fifth portion are positioned on a second insulating surface.

2. The display device including the pixel according to claim 1 , wherein the other one of the source and the drain of the first transistor is electrically connected to the gate of the second transistor.

3. The display device including the pixel according to claim 1 , wherein the third wiring is configured to supply power potential.

4. The display device including the pixel according to claim 1 , wherein the gate of the first transistor comprises a first gate and a second gate.

5. The display device including the pixel according to claim 1 , wherein the first portion is parallel to the third portion.

6. The display device including the pixel according to claim 1 , wherein the second insulating surface is positioned over the first insulating surface.

7. A display device including a pixel, the pixel comprising:
a first transistor;
a second transistor;
a light-emitting element,
a first wiring;
a second wiring; and
a third wiring,
wherein one of a source and a drain of the first transistor is electrically connected to the first wiring,
wherein a gate of the first transistor is electrically connected to the second wiring,
wherein one of a source and a drain of the second transistor is electrically connected to a pixel electrode,
wherein the other one of the source and the drain of the second transistor is electrically connected to the third wiring,
wherein the first wiring comprises a first portion and a second portion,
wherein the second wiring comprises a third portion and a fourth portion,
wherein the third wiring comprises a fifth portion,
wherein the second portion, the fourth portion, and the fifth portion are positioned on a second insulating surface.

8. The display device including the pixel according to claim 7 , wherein the other one of the source and the drain of the first transistor is electrically connected to the gate of the second transistor.

9. The display device including the pixel according to claim 7 , wherein the third wiring is configured to supply power potential.

10. The display device including the pixel according to claim 7 , wherein the gate of the first transistor comprises a first gate and a second gate.

11. The display device including the pixel according to claim 7 , wherein the first portion is parallel to the third portion.

12. The display device including the pixel according to claim 7 , wherein the second insulating surface is positioned over a first insulating surface.

13. A display device including a pixel, the pixel comprising:
a first transistor;
a second transistor;
a light-emitting element,
a first wiring;
a second wiring; and
a third wiring,
wherein one of a source and a drain of the first transistor is electrically connected to the first wiring,
wherein a gate of the first transistor is electrically connected to the second wiring,
wherein one of a source and a drain of the second transistor is electrically connected to a pixel electrode,
wherein the other one of the source and the drain of the second transistor is electrically connected to the third wiring,
wherein the first wiring comprises a first portion and a second portion,
wherein the second wiring comprises a third portion and a fourth portion,
wherein the third wiring comprises a fifth portion, and
wherein the fourth portion and the fifth portion are positioned on a second insulating surface.

14. The display device including the pixel according to claim 13 , wherein the other one of the source and the drain of the first transistor is electrically connected to the gate of the second transistor.

15. The display device including the pixel according to claim 13 , wherein the third wiring is configured to supply power potential.

16. The display device including the pixel according to claim 13 , wherein the gate of the first transistor comprises a first gate and a second gate.

17. The display device including the pixel according to claim 13 , wherein the first portion is parallel to the third portion.

18. The display device including the pixel according to claim 13 , wherein the second insulating surface is positioned over a first insulating surface.

19. A display device including a pixel, the pixel comprising:
a first transistor;
a second transistor;
a capacitor; and
a light-emitting element,
a first wiring;
a second wiring; and
a third wiring,
wherein one of a source and a drain of the first transistor is electrically connected to the first wiring,
wherein a gate of the first transistor is electrically connected to the second wiring,
wherein one of a source and a drain of the second transistor is electrically connected to a pixel electrode,
wherein the other one of the source and the drain of the second transistor is electrically connected to the third wiring,
wherein the gate of the second transistor is electrically connected to a first electrode of the capacitor,
wherein the first wiring comprises a first portion and a second portion,
wherein the second wiring comprises a third portion and a fourth portion,
wherein the third wiring comprises a fifth portion,
wherein the first portion, the third portion, the gate of the first transistor, the gate of the second transistor, and the first electrode of the capacitor are positioned on a first insulating surface, and
wherein the second portion, the fourth portion, and the fifth portion are positioned on a second insulating surface.

20. The display device including the pixel according to claim 19 , wherein the other one of the source and the drain of the first transistor is electrically connected to the gate of the second transistor, and
wherein the other one of the source and the drain of the first transistor is electrically connected to the first electrode of the capacitor.

21. The display device including the pixel according to claim 19 , wherein the third wiring is configured to supply power potential.

22. The display device including the pixel according to claim 19 , wherein the gate of the first transistor comprises a first gate and a second gate.

23. The display device including the pixel according to claim 19 , wherein the first portion is parallel to the third portion.

24. The display device including the pixel according to claim 19 , wherein the first insulating surface is positioned over the second insulating surface.

Assignees

• Semiconductor Energy Lab

Inventors

• Yamazaki Shunpei
• Arai Yasuyuki

Classifications

• H10P95/94

  Hydrogenation or deuterisation, e.g. using atomic hydrogen from a plasma · CPC title

• H10P14/3816

  Pulsed laser beam · CPC title

• H10P14/3454

  Amorphous · CPC title

• H10P14/3411

  Silicon, silicon germanium or germanium · CPC title

• H10P14/24

  using chemical vapour deposition [CVD] · CPC title