FLEXIBLE ORGANIC LIGHT EMITTING DISPLAY DEVICE

• US 20160095172A1
• Filed: 09/30/2015
• Published: 03/31/2016
• Est. Priority Date: 09/30/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: LEE, JaeYoung, PARK, JoonWon, KIM, Tae-Kyung, LEE, Sangheun, HUH, HaeRi, HEO, HunHoe, KIM, Ji-Min, YANG, Wonjae
• Granted Patent: US 10,021,741 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C23C 16/401 containing silicon
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Provided is a flexible organic light emitting display device including a pixel area and a bezel area that includes a first inorganic encapsulation layer on an organic light emitting element of the pixel area; a second inorganic encapsulation layer that is relatively flatter than the first inorganic encapsulation layer and encapsulates a plurality of foreign matter compensation layers by contacting the first inorganic encapsulation layer in the bezel area; and a foreign matter compensation layer structure in which the plurality of foreign matter compensation layers are stacked between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

Claims

1. A flexible organic light emitting display device including a pixel area and a bezel area, comprising:

a first inorganic encapsulation layer on an organic light emitting element of the pixel area;

a second inorganic encapsulation layer that is relatively flatter than the first inorganic encapsulation layer and encapsulates a plurality of foreign matter compensation layers by contacting the first inorganic encapsulation layer in the bezel area; and

a foreign matter compensation layer structure in which the plurality of foreign matter compensation layers are stacked between the first inorganic encapsulation layer and the second inorganic encapsulation layer.

2. The flexible organic light emitting display device according to claim 1, wherein the first and second inorganic encapsulation layers and the foreign matter compensation layer structure protect the organic light emitting element from oxygen and/or moisture.

3. The flexible organic light emitting display device according to claim 1, wherein the plurality of foreign matter compensation layers are stacked on a basis of flowability of materials configuring the plurality of foreign matter compensation layers, capability of suppressing possible damage generated during manufacturing, flexibility, and reduction in thickness.

4. The flexible organic light emitting display device according to claim 3, wherein the plurality of foreign matter compensation layers includes a first foreign matter compensation layer having at least first hardness and foreign matter compensation capability and a second foreign matter compensation layer having second hardness relatively higher than the first hardness and configured to protect the first foreign matter compensation layer from the damage.

5. The flexible organic light emitting display device according to claim 4, wherein the foreign matter compensation layers including at least the first foreign matter compensation layer and the second foreign matter compensation layer are configured to have a structure in which at least two flowable silicon oxycarbon layers are stacked.

6. The flexible organic light emitting display device according to claim 5, wherein the foreign matter compensation layers including at least the first foreign matter compensation layer and the second foreign matter compensation layer are configured such that the carbon contents are gradually reduced in an upward direction from a layer on a bottom layer to a layer on a top layer.

7. The flexible organic light emitting display device according to claim 5, further comprising:

a protective layer disposed between the first foreign matter compensation layer and the second foreign matter compensation layer and having relatively higher hardness and relatively lower flowability than the first foreign matter compensation layer.

8. The flexible organic light emitting display device according to claim 5, wherein an end of the first foreign matter compensation layer and an end of the second foreign matter compensation layer are positioned more inside than an end of the first inorganic encapsulation layer, an end of the second inorganic encapsulation layer is positioned more outside than the end of the first foreign matter compensation layer and the end of the second foreign matter compensation layer, and the second inorganic encapsulation layer is configured to encapsulate the first foreign matter compensation layer and the second foreign matter compensation layer by bonding the first inorganic encapsulation layer in the bezel area.

9. The flexible organic light emitting display device according to claim 1, further comprising:

a planarization foreign matter compensation layer disposed in a portion of the bezel area and the pixel area between the second foreign matter compensation layer and the second inorganic encapsulation layer and having a thickness of 10 μ

m or less.

10. The flexible organic light emitting display device according to claim 1, further comprising:

a planarization foreign matter compensation layer disposed in a portion of the bezel area and the pixel area on the second inorganic encapsulation layer and made of an acryl resin, a silicon resin, or an epoxy resin.

11. The flexible organic light emitting display device according to claim 10, further comprising:

a pressure sensitive adhesive layer adhering to the planarization foreign matter compensation layer; and

a barrier film on the pressure sensitive adhesive layer.

12. The flexible organic light emitting display device according to claim 1, further comprising:

an anti-oxidation layer disposed below the first inorganic encapsulation layer,

wherein the first foreign matter compensation layer includes at least oxygen, and the first inorganic encapsulation layer is made of aluminum oxide.

13. The flexible organic light emitting display device according to claim 9, further comprising:

a third inorganic encapsulation layer disposed between the second foreign matter compensation layer and the planarization foreign matter compensation layer.

14. The flexible organic light emitting display device according to claim 13, wherein the second inorganic encapsulation layer is made of a silicon based material, the third inorganic encapsulation layer is made of an aluminum based material, step coverage performance of the third inorganic encapsulation layer is relatively more excellent than the step coverage performance of the second inorganic encapsulation layer, and the thickness of the second inorganic encapsulation layer is larger than a thickness of the third inorganic encapsulation layer.

15. The flexible organic light emitting display device according to claim 13, wherein the third inorganic encapsulation layer is made of a silicon based material, the second inorganic encapsulation layer is made of an aluminum based material, step coverage performance of the second inorganic encapsulation layer is relatively more excellent than the step coverage performance of the third inorganic encapsulation layer, and a thickness of the third inorganic encapsulation layer is larger than a thickness of the second inorganic encapsulation layer.

16. The flexible organic light emitting display device according to claim 4, further comprising:

a third foreign matter compensation layer disposed in a portion of the bezel area and the pixel area on the second foreign matter compensation layer; and

a fourth foreign matter compensation layer disposed in a portion of the bezel area and the pixel area on the third foreign matter compensation layer,

wherein the third foreign matter compensation layer and the fourth foreign matter compensation layer are configured of silicon oxycarbon (SiOC) having different carbon contents, and the carbon content of the third foreign matter compensation layer is larger than the carbon content of the fourth foreign matter compensation layer.

17. The flexible organic light emitting display device according to claim 4, wherein the second foreign matter compensation layer is made of acryl, silicon, or epoxy and on the first foreign matter compensation layer, and the first foreign matter compensation layer is configured to protect the second foreign matter compensation layer while compensating a foreign matter.