Display device and method for manufacturing thereof

• US 8,937,429 B2
• Filed: 06/04/2014
• Issued: 01/20/2015
• Est. Priority Date: 01/25/2002
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Yamazaki, Shunpei
• Primary Examiner(s): Williams, Joseph L
• Application Number:
  US14/295,769
• Publication Number:
  US 20140284586A1
• Time in Patent Office: 230 Days
• Field of Search: 313/498, 313/504, 313/506, 313/509, 313/512
• US Class Current: 313/504
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/165 comprising dopants
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks

Abstract

It is a problem to provide an electric apparatus less in consumption power and long in life by the manufacture using the display device. An insulating bank is provided in a form surrounding the pixel portions on first electrodes over a substrate. The entire surface is applied, by a wet scheme (method), with an organic conductive film which has a thickness form of T2>T1>T3 under the influence of the insulating bank. Accordingly, the portion T3 has an increased resistance in a lateral direction, making possible to prevent against crosstalk. Due to a conductive polymer as a buffer layer, a display device can be provided which is low in drive voltage. Furthermore, because the portion T2 is increased in thickness, the electric-field concentration is relaxed at and around the pixel portion. This makes it possible to prevent the organic light-emitting element from deteriorating at around the pixel.

Claims

1. A light-emitting device comprising:

a substrate;

a first electrode and a second electrode each over the substrate, wherein the first electrode and the second electrode are arranged parallel to each other;

an insulating bank over the first electrode and the second electrode, wherein the insulating bank comprises a first opening overlapping the first electrode and a second opening overlapping the second electrode;

a first organic thin film over the first electrode, the second electrode, and the insulating bank, wherein the first organic thin film is in contact with the first electrode in the first opening and in contact with the second electrode in the second opening;

a second organic thin film over the first electrode with the first organic thin film interposed therebetween;

a third organic thin film over the second electrode with the first organic thin film interposed therebetween; and

a third electrode over the second organic thin film, the third organic thin film, and the insulating bank,

wherein the first organic thin film comprises;

a first region overlapping the first electrode in the first opening;

a second region overlapping the insulating bank and not overlapping the first electrode; and

a third region between the first region and the second region, and

wherein a thickness of the third region of the first organic thin film is larger than a thickness of the first region of the first organic thin film and a thickness of the second region of the first organic thin film.

2. The light-emitting device according to claim 1, wherein the first organic thin film is an organic conductive film.

3. The light-emitting device according to claim 1, wherein the first organic thin film comprises a conductive polymer.

4. The light-emitting device according to claim 1, wherein the thickness of the first region of the first organic thin film is larger than the thickness of the second region of the first organic thin film.

5. The light-emitting device according to claim 1,

wherein the third region of the first organic thin film comprises a boundary between a first interface and a second interface,

wherein the first interface is an interface between the first electrode and the first organic thin film, and

wherein the second interface is an interface between the first organic thin film and the insulating bank.

6. The light-emitting device according to claim 1, wherein the third electrode is arranged perpendicular to the first electrode and the second electrode.

7. The light-emitting device according to claim 6, comprising a fourth electrode over the second organic thin film, the third organic thin film, and the insulating bank, wherein the third electrode and the fourth electrode are arranged parallel to each other.

8. The light-emitting device according to claim 1, wherein the second organic thin film and the third organic thin film are each capable of exhibiting white light emission.

9. A display device comprising the light-emitting device according to claim 1, wherein the light-emitting device comprises a coloring layer over the third electrode.

10. A light-emitting device comprising:

a substrate;

a first electrode and a second electrode each over the substrate, wherein the first electrode and the second electrode are arranged parallel to each other;

an insulating bank over the first electrode and the second electrode, wherein the insulating bank comprises a first opening overlapping the first electrode and a second opening overlapping the second electrode;

a first organic thin film over the first electrode, the second electrode, and the insulating bank, wherein the first organic thin film is in contact with the first electrode in the first opening and in contact with the second electrode in the second opening;

a second organic thin film over the first electrode with the first organic thin film interposed therebetween;

a third organic thin film over the second electrode with the first organic thin film interposed therebetween; and

a third electrode over the second organic thin film, the third organic thin film, and the insulating bank,

wherein the first organic thin film comprises;

a first region overlapping the first electrode in the first opening;

a second region overlapping the insulating bank and not overlapping the first electrode; and

a third region between the first region and the second region,

wherein a thickness of the third region of the first organic thin film is larger than a thickness of the first region of the first organic thin film and a thickness of the second region of the first organic thin film, and

wherein the insulating bank comprises a curved surface.

11. The light-emitting device according to claim 10, wherein the first organic thin film is an organic conductive film.

12. The light-emitting device according to claim 10, wherein the first organic thin film comprises a conductive polymer.

13. The light-emitting device according to claim 10, wherein the thickness of the first region of the first organic thin film is larger than the thickness of the second region of the first organic thin film.

14. The light-emitting device according to claim 10,

wherein the third region of the first organic thin film comprises a boundary between a first interface and a second interface,

wherein the first interface is an interface between the first electrode and the first organic thin film, and

wherein the second interface is an interface between the first organic thin film and the insulating bank.

15. The light-emitting device according to claim 10, wherein the third electrode is arranged perpendicular to the first electrode and the second electrode.

16. The light-emitting device according to claim 15, comprising a fourth electrode over the second organic thin film, the third organic thin film, and the insulating bank, wherein the third electrode and the fourth electrode are arranged parallel to each other.

17. The light-emitting device according to claim 10, wherein the second organic thin film and the third organic thin film are each capable of exhibiting white light emission.

18. A display device comprising the light-emitting device according to claim 10, wherein the light-emitting device comprises a coloring layer over the third electrode.