OLED display panel and packaging method thereof, and OLED display device

Patent metadata

Field	Value
Publication number	US-9620739-B2
Application number	US-201514767975-A
Country	US
Kind code	B2
Filing date	Jan 7, 2015
Priority date	Sep 22, 2014
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

An OLED display panel, a packaging method thereof, and an OLED display device are provided. The OLED display panel comprises a substrate and a cover plate opposite to the substrate. An OLED device is provided on the substrate. The cover plate is attached onto the substrate so that the OLED device is located between the substrate and the cover plate. A packaging structure is provided between the substrate and the cover plate. The packaging structure surrounds periphery of the OLED device to hermetically package the OLED device in a dry and anti-oxidation manner. The packaging structure provided in periphery of the OLED device between the substrate and the cover plate in the OLED display panel can not only absorb moisture and oxygen well, but also hermetically package the OLED device more tightly, thereby protecting the OLED display panel against erosion of moisture and oxygen and ensuring better hermetical packaging effects.

First claim

The invention claimed is:

1. An OLED display panel, comprising a substrate and a cover plate provided opposite to the substrate, an OLED device being provided on the substrate, the cover plate being attached onto the substrate so that the OLED device is located between the substrate and the cover plate, wherein a packaging structure is further provided between the substrate and the cover plate, and the packaging structure surrounds periphery of the OLED device to hermetically package the OLED device in a dry and anti-oxidation manner,
wherein the packaging structure comprises an inner film layer and an outer film layer both surrounding the periphery of the OLED device, the outer film layer is closed annular while the inner film layer is unclosed annular, and the outer film layer surrounds periphery of the inner film layer.

2. The OLED display panel according to claim 1 , wherein the inner film layer is formed by splicing a plurality of folded-line-shaped sub-film layers, and any two adjacent sub-film layers have opposite portions to form an elongated groove between the opposite portions, wherein the opposite portions are not connected to each other, and gaps are formed at both ends of the groove.

3. The OLED display panel according to claim 2 , wherein number of the grooves formed by the plurality of sub-film layers ranges from 10 to 100.

4. The OLED display panel according to claim 2 , wherein there are desiccants and antioxidants filled into the grooves.

5. The OLED display panel according to claim 4 , wherein a mixing ratio of the desiccants to the antioxidants ranges from 2:1 to 3:1.

6. The OLED display panel according to claim 4 , wherein the desiccants comprise silica-gel desiccants, the antioxidants comprise Fe particles, and the desiccants and the antioxidants are spherical and/or cylindrical particles.

7. The OLED display panel according to claim 6 , wherein a size of each of the gaps is greater than that of each of the particles of the desiccants and the antioxidants.

8. The OLED display panel according to claim 1 , wherein the inner film layer and the outer film layer are both arranged on the substrate or the cover plate; or, one of the inner film layer and the outer film layer is arranged on the substrate while the other one is arranged on the cover plate.

9. The OLED display panel according to claim 8 , wherein thickness of the inner film layer is the same as that of the outer film layer, and thickness of both the inner film layer and the outer film layer is equal to that of the OLED device.

10. The OLED display panel according to claim 1 , wherein the inner film layer and the outer film layer are formed of heat curing glue or UV curing glue.

11. The OLED display panel according to claim 1 , wherein the packaging structure further comprises a plurality of compression resistant pads provided on a side, facing the OLED device, of the cover plate, the plurality of compression resistant pads are distributed uniformly, and number of the compression resistant pads is directly proportional to size of the OLED display panel.

12. The OLED display panel according to claim 11 , wherein each of the compression resistant pads is shaped as a circular truncated cone or column, the bottom surface, having a larger area, of the circular truncated cone is attached to the cover plate, and the top surface, having a smaller area, of the circular truncated cone is directed to the OLED device.

13. The OLED display panel according to claim 11 , wherein thickness of the compression resistant pad is smaller than or equal to difference between distance from the substrate to the cover plate and thickness of the OLED device.

14. The OLED display panel according to claim 11 , wherein the compression resistant pads are formed of polyurethane or polyethylene terephthalate.

15. An OLED display device, comprising the OLED display panel according to claim 1 .

16. The OLED display device according to claim 15 , wherein the inner film layer is formed by splicing a plurality of folded-line-shaped sub-film layers, and any two adjacent sub-film layers have opposite portions to form an elongated groove between the opposite portions, wherein the opposite portions are not connected to each other, and gaps are formed at both ends of the groove.

17. A packaging method of the OLED display panel according to claim 1 , comprising steps of: forming the packaging structure on the substrate or the cover plate, and then, aligning, fitting and hermetically packaging the substrate with the cover plate through the packaging structure,
wherein the step of forming the packaging structure on the substrate or the cover plate comprises:
coating seal agent onto the substrate or the cover plate, by a seal agent dispenser, to form the inner film layer and the outer film layer such that the inner film layer comprises a plurality of folded-line-shaped sub-film layers formed by coating, and any two adjacent sub-film layers have opposite portions to form an elongated groove between the opposite portions; wherein the opposite portions are not connected to each other, and gaps are formed at both ends of the groove; and
filling desiccants and antioxidants into the groove.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Wang Jing
• Zhang Ying
• Pei Yang
• Ding Jinbo
• Li Xin

Classifications

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K50/846

  comprising getter material or desiccants · CPC title

• H10K59/874 Primary

  including getter material or desiccant · CPC title

• H01L51/5259 Primary

  Electricity · mapped topic