Encapsulation structure, display panel, electronic device and encapsulation method

• US 10,673,014 B2
• Filed: 08/29/2019
• Issued: 06/02/2020
• Est. Priority Date: 10/08/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Ordos Yuansheng Optoelectronics Co., Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Ordos Yuansheng Optoelectronics Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Li, Zihua, Wen, Zhibo, Guo, Qiang, Jin, Wenqiang, Yuan, Yu, Wang, Xudong
• Primary Examiner(s): Kusumakar, Karen
• Application Number:
  US16/555,112
• Publication Number:
  US 20200111991A1
• Time in Patent Office: 278 Days
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/8722 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/40 Thermal treatment, e.g. annealing in the presence of a solvent vapour

Abstract

An encapsulation structure, a display panel, an electronic device and an encapsulation method are provided. The encapsulation structure includes: a first substrate and a second substrate, and a first sealant and a second sealant bonding the first substrate and the second substrate to each other. The first sealant includes a first inclined surface; the second sealant includes a second inclined surface which is attached to and in direct contact with the first inclined surface. In a direction parallel to the first substrate, each of the first inclined surface and the second inclined surface extends from a first position to a second position. Along a direction from the first position to the second position, a distance from the first inclined surface to the first substrate and a distance from the second inclined surface to the second substrate gradually change; and sums of the two distances are substantially equal.

Claims

1. An encapsulation structure, comprising:

a first substrate;

a second substrate facing the first substrate; and

a first sealant and a second sealant which are between the first substrate and the second substrate and bond the first substrate and the second substrate to each other, wherein

the first sealant comprises a first inclined surface facing away from the first substrate;

the second sealant comprises a second inclined surface facing away from the second substrate, and the second inclined surface is attached to and in contact with the first inclined surface;

in a direction parallel to the first substrate and the second substrate, each of the first inclined surface and the second inclined surface extends from a first position to a second position;

along a direction from the first position to the second position, a distance from the first inclined surface to the first substrate gradually changes, and a distance from the second inclined surface to the second substrate gradually changes; and

within a range from the first position to the second position, sums of the distance from the first inclined surface to the first substrate and the distance from the second inclined surface to the second substrate are substantially equal.

2. The encapsulation structure according to claim 1, wherein along the direction from the first position to the second position, the distance from the first inclined surface to the first substrate gradually decreases, and the distance from the second inclined surface to the second substrate gradually increases.

3. The encapsulation structure according to claim 1, wherein along the direction from the first position to the second position, the distance from the first inclined surface to the first substrate gradually increases, and the distance from the second inclined surface to the second substrate gradually decreases.

4. The encapsulation structure according to claim 1, wherein

a first included angle is between the first inclined surface and a plane in which the first substrate is located, and a second included angle is between the second inclined surface and a plane in which the second substrate is located;

and

the first included angle is equal to the second included angle.

5. The encapsulation structure according to claim 1, wherein an orthographic projection of the first inclined surface on the first substrate substantially overlaps an orthographic projection of the second inclined surface on the first substrate, and an orthographic projection of the first inclined surface on the second substrate substantially overlaps an orthographic projection of the second inclined surface on the second substrate.

6. The encapsulation structure according to claim 1, comprising a plurality of first sealants and a plurality of second sealants, wherein the plurality of first sealants correspond to the plurality of second sealant in a one-to-one manner.

7. The encapsulation structure according to claim 6, wherein the plurality of first sealants are connected into a closed ring, and the plurality of second sealants are connected into a closed ring.

8. The encapsulation structure according to claim 6, comprising four first sealants and four second sealants, wherein the four first sealants correspond to the four second sealants in the one-to-one manner, the four first sealants are connected into a closed ring, and the four second sealants are connected into a closed ring.

9. The encapsulation structure according to claim 1, wherein the direction from the first position to the second position is a length direction of the first sealant and a length direction of the second sealant.

10. The encapsulation structure according to claim 1, wherein each of a material of the first sealant and a material of the second sealant comprises an ultraviolet curable resin or a heat curable resin.

11. A display panel, comprising the encapsulation structure according to claim 1, wherein the display panel comprises a display region and a peripheral region surrounding the display region, and the encapsulation structure is located in the peripheral region.

12. The display panel according to claim 11, wherein

the display region is of a rectangular shape;

the encapsulation structure comprises four first sealants and four second sealants, the four first sealants correspond to the four second sealants in the one-to-one manner, the four first sealants are connected into a closed rectangular ring, and the four second sealants are connected into a closed rectangular ring.

13. An electronic device, comprising the encapsulation structure according to claim 1.

14. An encapsulation method, comprising:

providing a first substrate and a second substrate;

forming a first sealant and a second sealant between the first substrate and the second substrate, in which the first sealant comprises a first inclined surface facing away from the first substrate, and the second sealant comprises a second inclined surface facing away from the second substrate; and

bonding the first substrate and the second substrate to each other by the first sealant and the second sealant, in which the second inclined surface is attached to and in contact with the first inclined surface, wherein

in a direction parallel to the first substrate and the second substrate, each of the first inclined surface and the second inclined surface extends from a first position to a second position;

along a direction from the first position to the second position, a distance from the first inclined surface to the first substrate gradually changes, and a distance from the second inclined surface to the second substrate gradually changes; and

within a range from the first position to the second position, sums of the distance from the first inclined surface to the first substrate and the distance from the second inclined surface to the second substrate are substantially equal.

15. The encapsulation method according to claim 14, comprising:

forming the first sealant on the first substrate, and forming the second sealant on the second substrate, wherein

the first sealant is coated on the first substrate along a first direction, and the second sealant is coated on the second substrate along a second direction opposite to the first direction.

16. The encapsulation method according to claim 15, comprising:

coating the first sealant on the first substrate along the direction from the first position to the second position, wherein the distance from the first inclined surface to the first substrate gradually decreases along the direction from the first position to the second position; and

coating the second sealant on the second substrate along a direction from the second position to the first position, wherein the distance from the second inclined surface to the second substrate gradually increases along the direction from the first position to the second position.

17. The encapsulation method according to claim 15, comprising:

coating the first sealant on the first substrate along a direction from the second position to the first position, wherein the distance from the first inclined surface to the first substrate gradually increases along the direction from the first position to the second position; and

coating the second sealant on the second substrate along the direction from the first position to the second position, wherein the distance from the second inclined surface to the second substrate gradually decreases along the direction from the first position to the second position.

18. The encapsulation method according to claim 14, wherein

before bonding the first substrate and the second substrate to each other, the encapsulation method further comprises:

incompletely curing the first sealant and the second sealant so that the first sealant and the second sealant do not flow.

19. The encapsulation method according to claim 18, wherein

after bonding the first substrate and the second substrate to each other, the encapsulation method further comprises:

completely curing the first sealant and the second sealant.

20. The encapsulation method according to claim 14, wherein the direction from the first position to the second position is a length direction of the first sealant and a length direction of the second sealant.