IP Library › Granted Patent US 7,411,344

Granted Patent B2

US 7,411,344 · App. 11/753,600 · Granted Aug 12, 2008

Display device and electronic apparatus

Assignee: Semiconductor Energy Laboratory Co., Ltd.

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Quick Facts

Patent No.: US 7,411,344
App. No.: 11/753,600
Granted: Aug 12, 2008
Kind: B2

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Abstract

A display device in which variations in luminance due to variations in characteristics of transistors are reduced, and image quality degradation due to variations in resistance values is prevented. The invention comprises a transistor whose channel portion is formed of an amorphous semiconductor or an organic semiconductor, a connecting wiring connected to a source electrode or a drain electrode of the transistor, a light emitting element having a laminated structure which includes a pixel electrode, an electro luminescent layer, and a counter electrode, an insulating layer surrounding an end portion of the pixel electrode, and an auxiliary wiring formed in the same layer as a gate electrode of the transistor, a connecting wiring, or the pixel electrode. Further, the connecting wiring is connected to the pixel electrode, and the auxiliary wiring is connected to the counter electrode via an opening portion provided in the insulating layer.

Claims (108)

1. A display device comprising:

a gate electrode provided over a substrate;

a gate insulating layer provided over the gate electrode;

a first semiconductor region provided over the gate insulating layer and having one conductivity;

a second semiconductor region provided over the gate insulating layer and having the one conductivity;

a channel region provided over the gate insulating layer and between the first semiconductor region and the second semiconductor region and comprising an amorphous semiconductor;

a connecting wiring connected with one of the first semiconductor region and the second semiconductor region;

an auxiliary wiring provided over the gate insulating layer and in a same layer as the connecting wiring;

a first insulating layer provided over the auxiliary wiring and the first semiconductor region and the second semiconductor region and the connecting wiring;

a pixel electrode provided over the first insulating layer and connected with the connecting wiring;

a second insulating layer surrounding and provided over an end portion of the pixel electrode;

an electroluminescent layer provided over the pixel electrode;

a counter electrode provided over the electroluminescent layer; and

an opening provided in the first insulating layer and the second insulating layer and in a pixel portion comprising the pixel electrode,

wherein the auxiliary wiring is connected with the counter electrode via the opening.

2. A display device according to claim 1 wherein the substrate comprises a flexible substrate.

3. A display device according to claim 1 wherein the display device is incorporated into one selected from the group consisting of a portable terminal, a portable game machine, a goggle type display, a monitor, a camera and a personal computer.

4. A display device according to claim 1 further comprising a protective layer provided over the counter electrode.

5. A display device comprising:

a gate electrode provided over a substrate;

a gate insulating layer provided over the gate electrode;

a first N-type semiconductor region provided over the gate insulating layer;

a second N-type semiconductor region provided over the gate insulating layer;

a channel region provided over the gate insulating layer and between the first N-type semiconductor region and the second N-type semiconductor region and comprising an amorphous semiconductor;

a connecting wiring connected with one of the first N-type semiconductor region and the second N-type semiconductor region;

an auxiliary wiring provided over the gate insulating layer and in a same layer as the connecting wiring;

a first insulating layer provided over the auxiliary wiring and the first N-type semiconductor region and the second N-type semiconductor region and the connecting wiring;

a pixel electrode provided over the first insulating layer and connected with the connecting wiring;

a second insulating layer surrounding and provided over an end portion of the pixel electrode;

an electroluminescent layer provided over the pixel electrode;

a counter electrode provided over the electroluminescent layer; and

an opening provided in the first insulating layer and the second insulating layer and in a pixel portion comprising the pixel electrode,

wherein the auxiliary wiring is connected with the counter electrode via the opening.

6. A display device according to claim 5 wherein the substrate comprises a flexible substrate.

7. A display device according to claim 5 wherein the display device is incorporated into one selected from the group consisting of a portable terminal, a portable game machine, a goggle type display, a monitor, a camera and a personal computer.

8. A display device according to claim 5 further comprising a protective layer provided over the counter electrode.

9. A display device comprising:

a gate electrode provided over a substrate;

a gate insulating layer provided over the gate electrode;

a first semiconductor region provided over the gate insulating layer and having one conductivity;

a second semiconductor region provided over the gate insulating layer and having the one conductivity;

a channel region provided over the gate insulating layer and between the first semiconductor region and the second semiconductor region and comprising an amorphous semiconductor;

a first insulating layer provided over the first semiconductor region and the second semiconductor region;

a connecting wiring connected with one of the first semiconductor region and the second semiconductor region and provided over the first insulating layer;

a pixel electrode provided over the first insulating layer and connected with the connecting wiring;

an auxiliary wiring provided over the first insulating layer and in a same layer as the connecting wiring;

a second insulating layer surrounding and provided over an end portion of the pixel electrode;

an electroluminescent layer provided over the pixel electrode;

a counter electrode provided over the electroluminescent layer; and

an opening provided in the second insulating layer and in a pixel portion comprising the pixel electrode,

wherein the auxiliary wiring is connected with the counter electrode via the opening.

10. A display device according to claim 9 wherein the substrate comprises a flexible substrate.

11. A display device according to claim 9 wherein the display device is incorporated into one selected from the group consisting of a portable terminal, a portable game machine, a goggle type display, a monitor, a camera and a personal computer.

12. A display device according to claim 9 further comprising a protective layer provided over the counter electrode.

13. A display device comprising:

a gate electrode provided over a substrate;

a gate insulating layer provided over the gate electrode;

a first N-type semiconductor region provided over the gate insulating layer;

a second N-type semiconductor region provided over the gate insulating layer;

a channel region provided over the gate insulating layer and between the first N-type semiconductor region and the second N-type semiconductor region and comprising an amorphous semiconductor;

a first insulating layer provided over the first N-type semiconductor region and the second N-type semiconductor region;

a connecting wiring connected with one of the first N-type semiconductor region and the second N-type semiconductor region and provided over the first insulating layer;

a pixel electrode provided over the first insulating layer and connected with the connecting wiring;

an auxiliary wiring provided over the first insulating layer and in a same layer as the connecting wiring;

a second insulating layer surrounding and provided over an end portion of the pixel electrode;

an electroluminescent layer provided over the pixel electrode;

a counter electrode provided over the electroluminescent layer; and

an opening provided in the second insulating layer and in a pixel portion comprising the pixel electrode,

wherein the auxiliary wiring is connected with the counter electrode via the opening.

14. A display device according to claim 13 wherein the substrate comprises a flexible substrate.

15. A display device according to claim 13 wherein the display device is incorporated into one selected from the group consisting of a portable terminal, a portable game machine, a goggle type display, a monitor, a camera and a personal computer.

16. A display device according to claim 13 further comprising a protective layer provided over the counter electrode.

17. A display device comprising: