Stretchable display panel and method for manufacturing same, and display device

Patent metadata

Field	Value
Publication number	US-2022407023-A1
Application number	US-202117764440-A
Country	US
Kind code	A1
Filing date	Jun 8, 2021
Priority date	Jul 24, 2020
Publication date	Dec 22, 2022
Grant date	—

Abstract

A stretchable display panel and a method for manufacturing same, and a display apparatus, which belong to the technical field of display. The method comprises: forming an organic protection structure ( 100 ) and an inorganic protection structure ( 200 ), which are stacked, on a rigid substrate ( 000 ); forming a flexible substrate ( 300 ) on the inorganic protection structure ( 200 ); forming, on the flexible substrate ( 300 ), a plurality of pixel islands and inter-island connection pieces for connecting adjacent pixel islands; forming package layers on the pixel islands and the inter-island connection pieces; and lifting off the rigid substrate ( 000 ). The package layers are not in contact with the rigid substrate ( 000 ), but the organic protection structure ( 100 ) is always in contact with the rigid substrate ( 000 ). It is extremely easy for the organic protection structure ( 100 ) to be lifted off from the rigid substrate ( 000 ), and the probability of a crack occurring during the lifting-off process is relatively low, thereby effectively reducing the probability of package failure of the package layers, and further prolonging the service life of light-emitting devices in the pixel islands.

First claim

1 . A method for manufacturing a stretchable display panel, comprising:
forming an organic protective structure and an inorganic protective structure which are laminated on a rigid substrate; forming a flexible substrate on the inorganic protective structure; forming a plurality of pixel islands and inter-island connectors for connecting adjacent pixel islands on the flexible substrate, wherein the pixel islands and the inter-island connectors define hollow structures, and an orthographic projection of the hollow structure on the rigid substrate is within an orthographic projection of the organic protective structure on the rigid substrate and within an orthographic projection of the inorganic protective structure on the rigid substrate; forming an encapsulation layer on the pixel islands and the inter-island connectors; and stripping off the rigid substrate.

2 . The method according to claim 1 , wherein the hollow structure comprises: a first opening, and a second opening communicated with the first opening, wherein the first opening is closer to the rigid substrate than the second opening is, and an orthographic projection of the first opening on the rigid substrate is within an orthographic projection of the second opening on the rigid substrate.

3 . The method according to claim 2 , wherein the first opening is sleeved in the second opening.

4 . The method according to claim 2 , wherein a slope angle of a sidewall of the first opening is greater than a slope angle of a sidewall of the second opening.

5 . The method according to claim 1 , wherein forming the organic protective structure and the inorganic protective structure which are laminated on the rigid substrate comprises:
forming an organic protective film and an inorganic protective film in sequence on the rigid substrate; and performing a single patterning process on the inorganic protective film to form the organic protective structure and the inorganic protective structure on the rigid substrate.

6 . The method according to claim 5 , wherein performing the single patterning process on the inorganic protective film to form the organic protective structure and the inorganic protective structure on the rigid substrate comprises:
forming a photoresist film on the inorganic protective film; performing exposure and development on the photoresist film to form a photoresist pattern; performing first etching on the inorganic protective film to form the inorganic protective structure with the photoresist pattern; performing second etching on the organic protective film to form the organic protective structure with the photoresist pattern and the inorganic protective structure; and removing the photoresist pattern to form the organic protective structure and the inorganic protective structure.

7 . The method according to claim 1 , wherein stripping off the rigid substrate comprises:
stripping off the rigid substrate after carbonizing the organic protective structure and the flexible substrate.

8 . The method according to claim 7 , wherein when the rigid substrate is stripped off, the organic protective structure, or the organic protective structure and the inorganic protective structure are also stripped off.

9 . The method according to claim 1 , wherein forming the plurality of pixel islands and the inter-island connectors for connecting adjacent pixel islands on the flexible substrate comprises:
forming a plurality of functional layers on the flexible substrate; and forming openings in the plurality of functional layers to form the pixel islands and the inter-island connectors, wherein the hollow structures penetrate the plurality of functional layers and the flexible substrate.

10 . The method according to claim 9 , wherein the flexible substrate comprises a pixel region, and the pixel island is disposed in the pixel region; and
forming the plurality of functional layers on the flexible substrate comprises:
forming a plurality of display functional layers in the pixel region of the flexible substrate, the plurality of display functional layers being configured to form light-emitting devices in the pixel islands and drive circuits connected to the light-emitting devices; and
forming a plurality of connection functional layers in a region, other than the pixel region, of the flexible substrate, the plurality of connection functional layers being configured to form connection traces and trace protective structures in the inter-island connectors.

11 . The method according to claim 10 , wherein the flexible substrate further comprises a connection region, and the inter-island connector is disposed in the connection region; and
forming the openings in the plurality of functional layers to form the pixel islands and the inter-island connectors comprises:
removing portions, other than the connection region, of the plurality of connection functional layers, and removing portions, other than the connection region and the pixel region, of the flexible substrate, to form the pixel islands and the island inter-connectors.

12 . The method according to claim 1 , wherein after stripping off the rigid substrate, the method further comprises:
forming a protective film on a side, away from the encapsulation layer, of the flexible substrate.

13 . The method according to claim 1 , wherein the inorganic protective structure is made of a metal material.

14 . A stretchable display panel, wherein the stretchable display panel is manufactured by the method as defined in claim 1 , the stretchable display panel comprising:
a flexible substrate, and a plurality of pixel islands and inter-island connectors for connecting adjacent pixel islands, the pixel islands and the inter-island connectors being disposed on the flexible substrate, wherein the pixel islands and the inter-island connectors define hollow structures; and the stretchable display panel further comprising: an encapsulation layer on the pixel islands and the inter-island connectors.

15 . A display device, comprising: the stretchable display panel as defined in claim 14 .

Assignees

• Boe Technology Group Co Ltd

Inventors

• Zhu Xiaoyan
• Xue Jinxiang

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• G09F9/301

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title

• H01L51/0097 Primary

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic