Organic light emitting display apparatus and method of manufacturing the same

• US 9,583,732 B2
• Filed: 05/27/2015
• Issued: 02/28/2017
• Est. Priority Date: 05/28/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Jae Young, Kim, Tae-Kyung, Huh, Hae Ri, Heo, Hun Hoe, Kim, Ji-Min
• Primary Examiner(s): Lee, Kyoung
• Assistant Examiner(s): Mehta, Ratisha
• Application Number:
  US14/723,047
• Publication Number:
  US 20150349294A1
• Time in Patent Office: 643 Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/00 Constructional details relating to the organic devices covered by this subclass
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/873 Encapsulations

Abstract

A flexible organic light emitting display apparatus comprising a flexible encapsulation layer comprising at least one aluminum oxide layer configured to cover an area having a plurality of pixels, a flexible barrier film comprising a flexible barrier film body and a pressure sensitive adhesive layer on the flexible encapsulation layer and an adhesion supporter directly contacting the aluminum oxide layer and the pressure sensitive adhesive layer.

Claims

1. A flexible organic light emitting display apparatus comprising:

a flexible encapsulation layer comprising at least one aluminum oxide layer configured to cover an area having a plurality of pixels;

a flexible barrier film comprising a flexible barrier film body and a pressure sensitive adhesive layer on the flexible encapsulation layer; and

an adhesion supporter directly contacting the at least one aluminum oxide layer and the pressure sensitive adhesive layer,

wherein the flexible encapsulation layer comprises a first insulation layer, a foreign material compensation layer on the first insulation layer, and a second insulation layer on the foreign material compensation layer,

wherein the second insulation layer is the at least one aluminum oxide layer,

wherein the foreign material compensation layer is configured to planarize a display area and is configured to be progressively thinned in a non-display area such that an upper surface of the foreign material compensation layer at the non-display area is curved, and

wherein an edge of the second insulation layer at the non-display area is disposed more inward than an edge of the first insulation layer at the non-display area by a certain distance and the adhesion supporter is configured to cover a side surface of the edge of the second insulation layer and a portion of an upper surface of the first insulation layer.

2. The flexible organic light emitting display apparatus of claim 1, wherein the adhesion supporter is between the at least one aluminum oxide layer and the pressure sensitive adhesive layer.

3. The flexible organic light emitting display apparatus of claim 2, wherein the flexible encapsulation layer is in a bent shape and the adhesion supporter is configured to suppress delamination between the flexible encapsulation layer and the flexible barrier film.

4. The flexible organic light emitting display apparatus of claim 3, wherein the adhesion supporter is a silicon-based insulation layer that provides an increased adhesive strength between the flexible encapsulation layer and the flexible barrier film, when compared to a flexible organic light emitting display apparatus that does not have the adhesion supporter.

5. The flexible organic light emitting display apparatus of claim 3, wherein the flexible encapsulation layer has a triple-layer structure where the first insulation layer, the second insulation layer, and the foreign material compensation layer are stacked.

6. The flexible organic light emitting display apparatus of claim 1, wherein the flexible encapsulation layer, the adhesion supporter and the flexible barrier film are optically transparent and isotropic such that light emitted from the plurality of pixels passes through the flexible encapsulation layer, the adhesion supporter and the flexible barrier film.

7. A flexible organic light emitting display apparatus comprising:

a display area comprising a plurality of pixels;

a non-display area at a periphery of the display area;

a flexible encapsulation layer comprising at least one aluminum oxide layer on the plurality of pixels;

an adhesion supporter on the flexible encapsulation layer; and

a flexible barrier film adhered to the adhesion supporter,

wherein the flexible encapsulation layer comprises a first insulation layer, a foreign material compensation layer on the first insulation layer, and a second insulation layer on the foreign material compensation layer,

wherein the second insulation layer is the at least one aluminum oxide layer,

wherein the foreign material compensation layer is configured to planarize the display area and is configured to be progressively thinned in the non-display area such that an upper surface of the foreign material compensation layer at the non-display area is curved, and

wherein an edge of the second insulation layer at the non-display area is disposed more inward than an edge of the first insulation layer at the non-display area by a certain distance and the adhesion supporter is configured to cover a side surface of the edge of the second insulation layer and a portion of an upper surface of the first insulation layer.

8. The flexible organic light emitting display apparatus of claim 7, wherein a thickness of the at least one aluminum oxide layer is 20 nm to 50 nm.

9. The flexible organic light emitting display apparatus of claim 8, wherein a water vapor transmission ratio of the at least one aluminum oxide layer is 5×

10<sup>−

2</sup> to 1×

10<sup>−

4</sup> g/m²-day.

10. The flexible organic emitting display apparatus of claim 8, wherein an overall thickness of the first and second insulation layers is 40 nm to 100 nm and a thickness of the foreign material compensation layer is 3 μ

m to 20 μ

m.

11. The flexible organic emitting display apparatus of claim 7, wherein a thickness of the adhesion supporter is 2,000 Å

to 5,000 Å

.

12. The flexible organic emitting display apparatus of claim 11, wherein an adhesive strength of an interface between the flexible encapsulation layer and the flexible barrier film is equal to or more than 900 gf/inch.