Light emitting device, method of preparing the same and device for fabricating the same

• US 9,653,519 B2
• Filed: 01/06/2016
• Issued: 05/16/2017
• Est. Priority Date: 01/24/2002
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Hiroki, Masaaki, Murakami, Masakazu, Kuwabara, Hideaki
• Primary Examiner(s): Miyoshi, Jesse Y
• Application Number:
  US14/989,195
• Publication Number:
  US 20160118445A1
• Time in Patent Office: 496 Days
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• 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 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A light emitting device having a high definition, a high aperture ratio and a high reliability is provided. The present invention realizes a high definition and a high aperture ratio for a flat panel display of full colors using luminescent colors of red, green and blue without being dependent upon the film formation method and deposition precision of an organic compound layer by forming the laminated sections 21, 22 by means of intentionally and partially overlapping different organic compound layers of adjacent light emitting elements. Moreover, the protective film 32a containing hydrogen is formed and the drawback in the organic compound layer is terminated with hydrogen, thereby realizing the enhancement of the brightness and the reliability.

Claims

1. A light emitting device comprising:

a transistor;

a first electrode electrically connected to the transistor;

an insulator covering an end portion of the first electrode;

a second electrode in contact with the insulator;

a first light emitting layer and a second light emitting layer over the second electrode;

a third electrode over the first light emitting layer, the second light emitting layer and the second electrode; and

a terminal portion comprising a wiring,

wherein the first light emitting layer is electrically connected to the first electrode,

wherein the third electrode is electrically connected to the second electrode, and

wherein the second electrode is electrically connected to the wiring.

2. The light emitting device according to claim 1, further comprising a silicon nitride layer, wherein the silicon nitride layer is provided over and in direct contact with the thin electrode.

3. The light emitting device according to claim 1, further comprising an insulating layer over the transistor, wherein the insulating layer comprises an organic resin.

4. The light emitting device according to claim 1, further comprising an insulating layer over the transistor, wherein the insulating layer comprises an acrylic resin.

5. The light emitting device according to claim 1,

wherein the first light emitting layer comprises a first organic compound, and

wherein the second light emitting layer comprises a second organic compound.

6. The light emitting device according to claim 1,

wherein the first light emitting layer and the second light emitting layer are separated from each other with a gap over the insulator.

7. The light emitting device according to claim 1,

wherein the second light emitting layer is provided over the first electrode.

8. A display module comprising the light emitting device according to claim 1 and an FPC.

9. An electronic apparatus comprising the light emitting device according to claim 1 and at least one of an antenna, a battery, and an operation switch.

10. A light emitting device comprising:

a first substrate;

a transistor over the first substrate;

a first electrode electrically connected to the transistor;

an insulator covering an end portion of the first electrode;

a second electrode in contact with the insulator;

a first light emitting layer and a second light emitting layer over the second electrode;

a third electrode over the first light emitting layer, the second light emitting layer and the second electrode;

a terminal portion comprising a wiring;

a second substrate over the third electrode and the terminal portion; and

a sealing member between the first substrate and the second substrate,

wherein the first light emitting layer is electrically connected to the first electrode,

wherein the third electrode is electrically connected to the second electrode,

wherein the second electrode is electrically connected to the wiring, and

wherein the sealing member is provided over the wiring.

11. The light emitting device according to claim 10, further comprising a silicon nitride layer, wherein the silicon nitride layer is provided over and in direct contact with the third electrode.

12. The light emitting device according to claim 10, further comprising an insulating layer over the transistor, wherein the insulating layer comprises an organic resin.

13. The light emitting device according to claim 10, further comprising an insulating layer over the transistor, wherein the insulating layer comprises an acrylic resin.

14. The light emitting device according to claim 10,

wherein the first light emitting layer comprises a first organic compound, and

wherein the second light emitting layer comprises a second organic compound.

15. The light emitting device according to claim 10,

wherein the first light emitting layer and the second light emitting layer are separated from each other with a gap over the insulator.

16. The light emitting device according to claim 10,

wherein the second light emitting layer is provided over the first electrode.

17. A display module comprising the light emitting device according to claim 10 and an FPC.

18. An electronic apparatus comprising the light emitting device according to claim 10 and at least one of an antenna, a battery, and an operation switch.