Display device and method for manufacturing thereof

• US 8,004,183 B2
• Filed: 05/28/2010
• Issued: 08/23/2011
• 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): Guharay; Karabi
• Application Number:
  US12/790,238
• Publication Number:
  US 20100230669A1
• Time in Patent Office: 452 Days
• Field of Search: 313/504, 313/500
• 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 50/171 Electron 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;

at least a first insulating bank and a second insulating bank formed over the substrate;

a first electrode formed over the substrate and between the first insulating bank and the second insulating bank;

an organic conductive film comprising a low-molecular organic semiconductor and an accepter, wherein the organic conductive film is formed over the first electrode and on at least top surfaces of the first insulating bank and the second insulating bank;

an organic thin film containing an organic compound capable of causing electroluminescence formed over the first insulating bank, the second insulating bank and the organic conductive film; and

a second electrode formed over the organic thin film,

wherein the organic conductive film formed in a vicinity of a top edge of the first insulating bank has a first thickness, and the organic conductive film formed in a vicinity of a center of the first electrode between the first insulating bank and the second insulating bank has a second thickness, and

wherein the second thickness is thicker than the first thickness.

2. The light emitting device according to claim 1, wherein the light emitting device is an active matrix display device.

3. The light emitting device according to claim 1, wherein the light emitting device is a passive matrix display device.

4. The light emitting device according to claim 1, wherein the first insulating bank covers a first edge portion of the first electrode and the second insulating bank covers a second edge portion of the first electrode.

5. A light emitting device comprising:

a substrate;

at least a first insulating bank and a second insulating bank formed over the substrate;

a first electrode formed over the substrate and between the first insulating bank and the second insulating bank;

an organic conductive film comprising a low-molecular organic semiconductor and a donor, wherein the organic conductive film is formed over the first electrode and on at least top surfaces of the first insulating bank and the second insulating bank;

an organic thin film containing an organic compound capable of causing electroluminescence formed over the first insulating bank, the second insulating bank and the organic conductive film; and

a second electrode formed over the organic thin film,

wherein the organic conductive film formed in a vicinity of a top edge of the first insulating bank has a first thickness, and the organic conductive film formed in a vicinity of a center of the first electrode between the first insulating bank and the second insulating bank has a second thickness, and

wherein the second thickness is thicker than the first thickness.

6. The light emitting device according to claim 5, wherein the light emitting device is an active matrix display device.

7. The light emitting device according to claim 5, wherein the light emitting device is a passive matrix display device.

8. The light emitting device according to claim 5, wherein the first insulating bank covers a first edge portion of the first electrode and the second insulating bank covers a second edge portion of the first electrode.

9. A light emitting device comprising:

a substrate;

at least a first insulating bank and a second insulating bank formed over the substrate;

a first electrodes formed over the substrate and between the first insulating bank and the second insulating bank;

an organic conductive film covering surfaces of the first insulating bank and the second insulating bank and formed over the first electrode;

an organic thin film containing an organic compound capable of causing electroluminescence formed over the first insulating bank, the second insulating bank and the organic conductive film; and

a second electrode formed over the organic thin film,

wherein the organic conductive film formed in a vicinity of a top edge of the first insulating bank has a first thickness, and the organic conductive film formed in a vicinity of a center of the first electrode between the first insulating bank and the second insulating bank has a second thickness, and

wherein the second thickness is thicker than the first thickness.

10. The light emitting device according to claim 9, wherein the organic conductive film comprises a low-molecular organic semiconductor and an accepter.

11. The light emitting device according to claim 9, wherein the organic conductive film comprises a low-molecular organic semiconductor and a donor.

12. The light emitting device according to claim 9, wherein the light emitting device is an active matrix display device.

13. The light emitting device according to claim 9, wherein the light emitting device is a passive matrix display device.

14. The light emitting device according to claim 9, wherein the first insulating bank covers a first edge portion of the first electrode and the second insulating bank covers a second edge portion of the first electrode.

15. A light emitting device comprising:

a substrate;

a first electrode formed over the substrate;

a second electrode formed over the substrate;

a first insulating bank formed over the substrate and a first edge portion of the first electrode;

a second insulating bank formed over the substrate, a second edge portion of the first electrode and a first edge portion of the second electrode;

a third insulating bank formed over the substrate and a second edge portion of the second electrode;

an organic conductive film formed over the first insulating bank, the second insulating bank, the third insulating bank, the first electrode and the second electrode;

an organic thin film containing an organic compound capable of causing electroluminescence formed over the first electrode, the second electrode, the first insulating bank, the second insulating bank, the third insulating bank and the organic conductive film;

wherein the organic conductive film formed in a vicinity of a top edge of the first insulating bank has a first thickness, and the organic conductive film formed in a vicinity of a center of the first electrode between the first insulating bank and the second insulating bank has a second thickness, and

wherein the second thickness is thicker than the first thickness.

16. The light emitting device according to claim 15, wherein the organic conductive film is a conductive polymer film.

17. The light emitting device according to claim 15, wherein the organic conductive film is a polymer having π

-conjugated system added with an acceptor or a donor.

18. A light emitting device according to claim 15, wherein the organic conductive film has a conductivity of 10⁻

6 S/cm or higher and 10<sup>−

2</sup> S/cm or lower.

19. The light emitting device according to claim 15, wherein the organic conductive film comprises a low-molecular organic semiconductor and an accepter.

20. The light emitting device according to claim 15, wherein the organic conductive film comprises a low-molecular organic semiconductor and a donor.

21. The light emitting device according to claim 15, wherein the light emitting device is an active matrix display device.

22. The light emitting device according to claim 15, wherein the light emitting device is a passive matrix display device.