Stretchable display substrate, method for preparing the same, and stretchable display device

Patent metadata

Field	Value
Publication number	US-11699364-B2
Application number	US-202016934944-A
Country	US
Kind code	B2
Filing date	Jul 21, 2020
Priority date	Dec 20, 2019
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

The present disclosure provides a stretchable display substrate, a method for preparing the same, and a stretchable display device. The display substrate includes: a plurality of island areas arranged in an array, and a bridge area for connecting adjacent island areas, each of the plurality of island areas including a display region and a non-display region surrounding the display region, in which the non-display region is provided with a first groove arranged around the display region, an organic light emitting pattern arranged in the first groove, and an encapsulation pattern arranged in the first groove and covering the organic light emitting pattern in the first groove.

First claim

What is claimed is:

1. A stretchable display substrate, comprising a plurality of island areas arranged in an array, and a bridge area for connecting adjacent island areas, each of the plurality of island areas comprising a display region and a non-display region surrounding the display region, wherein the non-display region is provided with a first groove arranged around the display region, an organic light emitting pattern arranged in the first groove, and an encapsulation pattern arranged in the first groove and covering the organic light emitting pattern in the first groove.

2. The stretchable display substrate of claim 1 , wherein there is a plurality of first grooves, the plurality of first grooves is distributed at intervals around the display region, and a size of an opening of each of the first grooves is greater than or equal to a size of the organic light emitting pattern in the first groove.

3. The stretchable display substrate of claim 2 , wherein each side of each island area comprises n first grooves in a cross-section of the island along a direction from the non-display region to the display region, a value of n being in a range from 1 to 10.

4. The stretchable display substrate of claim 1 , wherein the first groove is a rectangular groove having a length a 2 , a width a 1 and a height a 3 , wherein a value of a 1 is in a range from 1.0 μm to 50.0 μm, a value of a 2 is in a range from 1.0 μm to 50.0 μm, and a value of a 3 is in a range from 1.0 μm to 5.0 μm.

5. The stretchable display substrate of claim 1 , wherein the non-display region is further provided with an annular groove arranged around the display region and located between the first groove and the display region, an organic light emitting pattern arranged in the annular groove, and an encapsulation pattern arranged in the annular groove and covering the organic light emitting pattern in the annular groove.

6. The stretchable display substrate of claim 5 , wherein the stretchable display substrate further comprises: a planarization layer, the annular groove is arranged on the planarization layer, and a height of the planarization layer from the annular groove to the display region gradually increases.

7. The stretchable display substrate of claim 1 , wherein the bridge area is provided with: a second groove arranged along an extending direction of the bridge area, an organic light emitting pattern arranged in the second groove, and an encapsulation pattern arranged in the second groove and covering the organic light emitting pattern in the second groove.

8. The stretchable display substrate of claim 7 , wherein there is a plurality of second grooves, the plurality of second grooves is distributed at intervals along the extending direction of the bridge area, and a size of an opening of each of the plurality of second grooves is greater than or equal to a size of the organic light emitting pattern in the second groove.

9. The stretchable display substrate of claim 7 , wherein the second groove is a strip-shaped groove, the strip-shaped groove is formed by at least two convex structures arranged in the bridge area, each of the at least two convex structures extends along an extending direction of the bridge area, and a width of an opening of the strip-shaped groove is greater than or equal to a width of the organic light emitting pattern in the second groove.

10. The stretchable display substrate of claim 9 , wherein each of the at least two convex structures is a cylindrical convex structure, and a value of a height c 1 of the cylindrical convex structure is in a range from 1.0 μm to 15.0 μm, a value of a width c 2 is in a range from 1.0 μm to 40.0 μm, and a value of a width c 3 of the strip-shaped groove is in a range from 1.0 μm to 50.0 μm.

11. The stretchable display substrate of claim 1 , wherein the non-display region is further provided with an annular dam structure arranged around the first groove.

12. The stretchable display substrate of claim 1 , wherein the encapsulation pattern is made of encapsulation adhesive mixed with a desiccant.

13. A stretchable display device comprising the stretchable display substrate of claim 1 .

14. A method for preparing a stretchable display substrate, comprising:
providing a flexible substrate, comprising a plurality of island areas arranged in an array and a bridge area for connecting adjacent island areas, each of the plurality of island areas comprising a display region and a non-display region surrounding the display region;
forming a first groove arranged around the display region;
providing a fine metal mask provided with sub-pixel openings in both the display region and the non-display region;
forming an organic light emitting pattern by using the fine metal mask, the organic light emitting pattern of the first groove being formed in the first groove; and
forming an encapsulation pattern in the first groove to cover the organic light emitting pattern in the first groove.

15. The method of claim 14 , wherein after the forming the organic light emitting pattern by using the fine metal mask, the method further comprises:
rinsing the flexible substrate on which the organic light emitting pattern is formed with an organic solvent; and
baking the rinsed flexible substrate to volatilize the organic solvent.

16. The method of claim 15 , wherein during the rinsing, the organic light emitting pattern located proximate to the first groove is rinsed into the first groove.

17. The method of claim 14 , further comprising:
forming an annular groove arranged around the display region and located between the first groove and the display region; wherein the organic light emitting pattern of the annular groove is formed in the annular groove.

18. The method of claim 14 , further comprising:
forming a second groove arranged along an extending direction of the bridge area in the bridge area, wherein the organic light emitting pattern of the second groove is formed in the second groove; and
forming an encapsulation pattern in the second groove to cover the organic light emitting pattern in the second groove.

19. The method of claim 14 , further comprising:
forming at least two convex structures arranged along an extending direction of the bridge area in the bridge area, and forming a strip-shaped groove between adjacent convex structures, a width of an opening of the strip-shaped groove being greater than or equal to a width of the organic light emitting pattern in the second groove.

20. The method of claim 14 , further comprising: forming an annular dam structure arranged around the first groove in the non-display region.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sui Kai
• Zhu Haibin
• An Che

Classifications

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• H10K50/8426

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

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K71/00

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