Encapsulation structure of organic electroluminescence device

• US 20060170341A1
• Filed: 08/11/2005
• Published: 08/03/2006
• Est. Priority Date: 02/02/2005
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Su, Chih-Hung, Lih, Jiin-Jou
• Granted Patent: US 7,256,543 B2
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: H10K 50/844 Encapsulations

Abstract

An encapsulation structure of organic electroluminescence device (OELD) is provided. The encapsulation structure comprises a substrate, an OELD, a soft protection layer, a moisture absorption layer and a rigid protective layer. The OELD is disposed over the substrate. The soft protection layer is disposed over the substrate, and encloses the OELD. The moisture absorption layer encloses the soft protection layer. The rigid protective layer encloses the moisture absorption layer.

Claims

1. An encapsulation structure of an organic electroluminescence device, comprising:

a substrate;

an organic electroluminescence device (OELD) disposed on the substrate;

a soft protection layer, disposed on the substrate, for enclosing the OELD;

a moisture absorption layer, disposed on the substrate, for enclosing the soft protection layer; and

a rigid protective layer, disposed on the substrate, for enclosing the moisture absorption layer.

2. The encapsulation structure according to claim 1, wherein the soft protection layer comprises a silicon nitride layer.

3. The encapsulation structure according to claim 1, wherein the soft protection layer comprises a polymer layer.

4. The encapsulation structure according to claim 1, wherein the moisture absorption layer comprises an active metal or an active metal alloy.

5. The encapsulation structure according to claim 4, wherein the active metal comprises calcium (Ca), strontium (Sr), barium (Ba), or an alloy thereof.

6. The encapsulation structure according to claim 1, wherein the moisture absorption layer comprises a metal oxide or a metal sulfide.

7. The encapsulation structure according to claim 6, wherein the moisture absorption layer comprises calcium oxide (CaO), strontium oxide (SrO), barium oxide (BaO), barium sulfide (BaS), strontium sulfide (SrS), calcium sulfide (CaS), or a combination thereof.

8. The encapsulation structure according to claim 1, wherein the rigid protective layer is substantially made of an inorganic material.

9. The encapsulation structure according to claim 8, wherein the inorganic material comprises silicon oxide (SiO), silicon nitride (SiN), silicon oxynitride (SiON), silicon carbide (SiC), aluminum oxide (AlO), or a combination thereof.

10. The encapsulation structure according to claim 1, wherein the rigid protective layer comprises a low active metal or a low active metal alloy.

11. The encapsulation structure according to claim 10, wherein the low active metal comprises platinum (Pt), silver (Ag), gold (Au), or an alloy thereof.

12. The encapsulation structure according to claim 1, further comprising:

a hard coat layer disposed on the rigid protective layer substantially made of a polymer.

13. The encapsulation structure according to claim 1, further comprising:

another substrate attached on the rigid protective layer.

14. The encapsulation structure according to claim 1, wherein the thickness of the soft protection layer ranges from about 50 nm to about 1000 nm.

15. The encapsulation structure according to claim 1, wherein the thickness of the moisture absorption layer ranges from about 50 nm to about 2000 nm.

16. The encapsulation structure according to claim 1, wherein the thickness of the rigid protective layer ranges from about 50 nm to about 1000 nm.