Light emitting device comprising transparent protrusion, first and second electrodes and organic layer

• US 7,973,471 B2
• Filed: 03/26/2008
• Issued: 07/05/2011
• Est. Priority Date: 01/29/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime
• Primary Examiner(s): Hines; Anne M
• Application Number:
  US12/055,412
• Publication Number:
  US 20080211396A1
• Time in Patent Office: 1,196 Days
• Field of Search: 313498-512
• US Class Current: 313/506
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/8052 Cathodes
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

There is provided a method for manufacturing a light emitting device in which no copy-in is caused in the case of a light emitting device having a glossy cathode. An uneven portion is formed on the surface of a cathode which is in contact with an organic layer in a pixel portion, and incident light is reflected in all directions. An insulating film having a high light absorption property is formed in a driver circuit portion, and the copy-in becomes invisible to the observer.

Claims

1. A light emitting device comprising:

a thin film transistor over a substrate;

an interlayer insulating film over the thin film transistor;

at least a transparent protrusion over the interlayer insulating film;

a first electrode over the transparent protrusion;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

2. A light emitting device according to claim 1, wherein the first electrode has a property of transmitting light.

3. A light emitting device according to claim 1, wherein the first electrode is overlapped with a plurality of transparent protrusions including the transparent protrusion.

4. A light emitting device according to claim 1, wherein the thin film transistor is electrically connected to the first electrode.

5. A light emitting device comprising:

a thin film transistor over a substrate;

an interlayer insulating film over the thin film transistor;

at least a protrusion having a property of transmitting light over the interlayer insulating film;

a first electrode over the protrusion having the property of transmitting light;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

6. A light emitting device according to claim 5, wherein the first electrode has a property of transmitting light.

7. A light emitting device according to claim 5, wherein the first electrode is overlapped with a plurality of protrusions each having a property of transmitting light including the protrusion having the property of transmitting light.

8. A light emitting device according to claim 5, wherein the thin film transistor is electrically connected to the first electrode.

9. A light emitting device comprising:

a thin film transistor including a gate insulating film over a substrate;

at least a transparent protrusion over the gate insulating film;

a first electrode over the transparent protrusion;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

10. A light emitting device according to claim 9, wherein the first electrode has a property of transmitting light.

11. A light emitting device according to claim 9, wherein the first electrode is overlapped with a plurality of transparent protrusions including the transparent protrusion.

12. A light emitting device according to claim 9, wherein the thin film transistor is electrically connected to the first electrode.

13. A light emitting device comprising:

a thin film transistor over an underlying film;

at least a transparent protrusion over the underlying film;

a first electrode over the transparent protrusion;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

14. A light emitting device according to claim 13, wherein the first electrode has a property of transmitting light.

15. A light emitting device according to claim 13, wherein the first electrode is overlapped with a plurality of transparent protrusions including the transparent protrusion.

16. A light emitting device according to claim 13, wherein the thin film transistor is electrically connected to the first electrode.

17. A light emitting device comprising:

at least a transparent protrusion;

a first electrode having an uneven surface due to the transparent protrusion;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

18. A light emitting device according to claim 17, wherein the first electrode has a property of transmitting light.

19. A light emitting device according to claim 17, wherein the first electrode is overlapped with a plurality of transparent protrusions including the transparent protrusion.

20. A light emitting device comprising:

at least a protrusion having a property of transmitting light;

a first electrode having an uneven surface due to the protrusion having the property of transmitting light;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

21. A light emitting device according to claim 20, wherein the first electrode has a property of transmitting light.

22. A light emitting device according to claim 20, wherein the first electrode is overlapped with a plurality of protrusions each having a property of transmitting light including the protrusion having the property of transmitting light.

23. A light emitting device comprising:

at least a layer containing a transparent material;

a first electrode having an uneven surface due to the layer containing the transparent material;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

24. A light emitting device according to claim 23, wherein the first electrode has a property of transmitting light.

25. A light emitting device according to claim 23, wherein the first electrode is overlapped with a plurality of layers each containing a transparent material including the layer containing the transparent material.

26. A light emitting device comprising:

at least a layer having a property of transmitting light;

a first electrode having an uneven surface due to the layer having the property of transmitting light;

an organic layer over the first electrode and in contact with a portion of the first electrode; and

a second electrode over the organic layer.

27. A light emitting device according to claim 26, wherein the first electrode has a property of transmitting light.

28. A light emitting device according to claim 26, wherein the first electrode is overlapped with a plurality of layers each having a property of transmitting light including the layer having the property of transmitting light.