Light emitting device

• US 8,026,531 B2
• Filed: 03/16/2006
• Issued: 09/27/2011
• Est. Priority Date: 03/22/2005
• 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): CHU, CHRIS C
• Application Number:
  US11/376,842
• Publication Number:
  US 20060214152A1
• Time in Patent Office: 2,021 Days
• Field of Search: 257/E25.008, 257/E33.056, 257/40, 257/90, 257/91, 257/99, 257/81, 257/89, 257/103, 427/69, 345/76, 315/169.3, 428/917, 445/25, 313/512, 313/500, 313/502, 313/503, 438/22
• US Class Current: 257/99
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

To provide a light emitting device in which generation of cross talk between adjacent light emitting elements is suppressed, even when the light emitting device uses a light emitting element having high current efficiency. Also, to provide a light emitting device having high display quality even when the light emitting device uses a light emitting element having high current efficiency. The light emitting device has a pixel portion including a plurality of light emitting elements, wherein each of the plurality of light emitting elements includes a plurality of light emitting bodies provided between a first electrode and a second electrode and a conductive layer formed between the plurality of light emitting bodies, wherein the conductive layer is provided for each light emitting element, and wherein an edge portion of the conductive layer is covered with the plurality of light emitting bodies.

Claims

1. A light emitting device comprising:

a pixel portion including a plurality of light emitting elements,

a first light emitting body and a second light emitting body between a first electrode and a second electrode, and a conductive layer formed between the first light emitting body and the second light emitting body in each of the plurality light emitting elements,

wherein the conductive layer is provided for each light emitting element,

wherein the conductive layer provided for each light emitting element is independent from one another,

wherein the totality of an upper surface of the conductive layer is in contact with the first light emitting body, and

wherein the totality of a lower surface of the conductive layer is in contact with the second light emitting body.

2. The light emitting device according to claim 1, wherein a layer formed using at least a part of compounds included in the first light emitting body and the second light emitting body is provided between adjacent conductive layers which are independent from one another.

3. The light emitting device according to claim 1, wherein an edge portion of the conductive layer is provided outside of an edge portion of a light emitting region in each of the plurality of light emitting elements.

4. The light emitting device according to claim 1, wherein a second conductive layer is formed in contact with the first electrode.

5. The light emitting device according to claim 1, wherein a second conductive layer is formed in contact with the first electrode and a third conductive layer is formed in contact with the second electrode.

6. A light emitting device comprising:

a pixel portion including a plurality of light emitting elements,

a first light emitting body and a second light emitting body provided between a first electrode and a second electrode, and a conductive layer formed between the first light emitting body and the second light emitting body in each of the plurality of light emitting elements,

wherein the conductive layer is provided for each light emitting element,

wherein an edge portion of the conductive layer is covered with the first light emitting body and the second light emitting body,

wherein the totality of an upper surface of the conductive layer is in contact with the first light emitting body, and

wherein the totality of a lower surface of the conductive layer is in contact with the second light emitting body.

7. The light emitting device according to claim 6, wherein the edge portion of the conductive layer is provided outside of an edge portion of a light emitting region in each of the plurality of light emitting elements.

8. The light emitting device according to claim 6, wherein a second conductive layer is formed in contact with the first electrode.

9. The light emitting device according to claim 6, wherein a second conductive layer is formed in contact with the first electrode and a third conductive layer is formed in contact with the second electrode.

10. A light emitting device comprising:

a plurality of light emitting elements each comprising;

a first electrode;

a second electrode;

a first light emitting body;

a second light emitting body; and

a conductive layer,

wherein the first light emitting body and the second light emitting body are formed between the first electrode and the second electrode,

wherein the conductive layer is formed between the first light emitting body and the second light emitting body,

wherein the conductive layer provided for each light emitting element is independent from one another,

wherein the totality of an upper surface of the conductive layer is in contact with the first light emitting body, and

wherein the totality of a lower surface of the conductive layer is in contact with the second light emitting body.

11. The light emitting device according to claim 10, wherein a layer formed using at least a part of compounds included in the first light emitting body and the second light emitting body is provided between adjacent conductive layers which are independent from one another.

12. The light emitting device according to claim 10, wherein an edge portion of the conductive layer is provided outside of an edge portion of a light emitting region in each of the plurality of light emitting elements.

13. The light emitting device according to claim 10, wherein a second conductive layer is formed in contact with the first electrode.

14. The light emitting device according to claim 10, wherein a second conductive layer is formed in contact with the first electrode and a third conductive layer is formed in contact with the second electrode.

15. A light emitting device comprising:

a plurality of light emitting elements each comprising;

a first electrode;

a second electrode;

a first light emitting body;

a second light emitting body; and

a conductive layer,

wherein the first light emitting body and the second light emitting body are formed between the first electrode and the second electrode,

wherein the conductive layer is formed between the first light emitting body and the second light emitting body,

wherein an edge portion of the conductive layer is covered with the first light emitting body and the second light emitting body,

wherein the totality of an upper surface of the conductive layer is in contact with the first light emitting body, and

wherein the totality of a lower surface of the conductive layer is in contact with the second light emitting body.

16. The light emitting device according to claim 15, wherein the edge portion of the conductive layer is provided outside of an edge portion of a light emitting region in each of the plurality of light emitting elements.

17. The light emitting device according to claim 15, wherein a second conductive layer is formed in contact with the first electrode.

18. The light emitting device according to claim 15, wherein a second conductive layer is formed in contact with the first electrode and a third conductive layer is formed in contact with the second electrode.