OLED display substrate and method for preparing the same, and display device

Patent metadata

Field	Value
Publication number	US-10790476-B2
Application number	US-201916511272-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Dec 13, 2018
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

A method for preparing an OLED display substrate of an embodiment of the present disclosure comprises: providing a substrate comprising pixel definition regions each for defining a pixel unit, and forming a first electrode in the pixel unit; forming a pixel definition structure and an auxiliary electrode in the pixel definition region, the pixel definition structure being configured to separate the first electrode from the auxiliary electrode; forming a phase transition structure; forming a light-emitting layer to cover the phase transition structure and the first electrode; exciting the phase transition structure to contract the phase transition structure, thereby causing the light-emitting layer to be broken at a position corresponding to the contraction of the phase transition structure to form an opening; and forming a second electrode, such that the second electrode covers the light-emitting layer and is electrically connected to the auxiliary electrode through the opening.

First claim

What is claimed is:

1. A method for preparing an Organic Light-Emitting Diode (OLED) display substrate, comprising:
providing a substrate comprising pixel definition regions each for defining a pixel unit, and forming a first electrode in the pixel unit;
forming a pixel definition structure and an auxiliary electrode in the pixel definition region, the pixel definition structure being configured to separate the first electrode from the auxiliary electrode;
forming a phase transition structure on both the pixel definition structure and the auxiliary electrode and directly in contact with both the pixel definition structure and the auxiliary electrode;
forming a light-emitting layer to cover the phase transition structure and the first electrode;
exciting the phase transition structure to contract the phase transition structure, thereby causing the light-emitting layer to be broken at a position corresponding to the contraction of the phase transition structure to form an opening; and
forming a second electrode, such that the second electrode covers the light-emitting layer and is electrically connected to the auxiliary electrode through the opening.

2. The method of claim 1 , wherein the forming the phase transition structure comprises forming a first phase transition structure on a surface of the auxiliary electrode away from the substrate.

3. The method of claim 1 , wherein the pixel definition structure encloses a first closed pattern, with a first holding region being in a pattern body of the first closed pattern, and with the auxiliary electrode being formed in the first holding region.

4. The method of claim 3 , wherein a middle portion of the first holding region between at least partially adjacent two pixel units further has a second holding region, and the forming the phase transition structure comprises forming a second phase transition the second holding region on the substrate.

5. The method of claim 1 , wherein the exciting the phase transition structure comprises irradiating the phase transition structure with a laser beam.

6. The method of claim 5 , wherein the laser beam has a wavelength of 330 to 380 nm, an energy density of 10 to 6000 mJ/cm 2 , a frequency of 100 to 3000 Hz, and a duration of 5 to 1000 ns.

7. The method of claim 1 , wherein a material for forming the phase transition structure comprises one or a mixture of polyimide or polysiloxane containing azobenzene structure, polyimide containing a benzopyrylospiran structure, chlorinated polyethylene, and acryloyl-cinnamoyl-ethylene diester copolymer.

8. The method of claim 1 , wherein the first electrode is an anode and the second electrode is a cathode.

9. The method of claim 1 , wherein a material of the auxiliary electrode is at least one selected from molybdenum, aluminum, copper, silver, and niobium, and a material of the pixel definition structure is selected from resin, polyimide, silicone or silica.

10. An OLED display substrate, comprising:
a substrate, comprising pixel definition regions each for defining a pixel unit;
a first electrode arranged in the pixel unit;
a pixel definition structure and an auxiliary electrode arranged in each of the pixel definition regions, the pixel definition structure being located between the first electrode and the auxiliary electrode to separate the first electrode from the auxiliary electrode;
a phase transition structure arranged on both the pixel definition structure and the auxiliary electrode and directly in contact with both the pixel definition structure and the auxiliary electrode;
a light-emitting layer covering the phase transition structure and the first electrode, which is broken at a position corresponding to the contraction of the phase transition structure to form an opening, thereby exposing at least a part of a surface of the auxiliary electrode; and
a second electrode covering the light-emitting layer and being electrically connected to the auxiliary electrode through the opening.

11. The OLED display substrate of claim 10 , wherein the phase transition structure comprises a first phase transition structure arranged on a surface of the auxiliary electrode away from the substrate.

12. The OLED display substrate of claim 11 , wherein the opening comprises a first opening corresponding to a position of the first phase transition structure, and a surface of the auxiliary electrode away from the substrate is electrically connected to the second electrode through the first opening.

13. The OLED display substrate of claim 10 , wherein the pixel definition structure encloses a first closed pattern, with a first holding region being in a pattern body of the first closed pattern, and with the auxiliary electrode being formed in the first holding region; and a middle portion of the first holding region between at least partially adjacent two pixel units further has a second holding region, and the second holding region is provided with a second phase transition structure.

14. The OLED display substrate of claim 13 , wherein the opening comprises a second opening corresponding to a position of the second phase transition structure, with a side surface of the auxiliary electrode being electrically connected to the second electrode through the second opening.

15. The OLED display substrate of claim 14 , wherein a size of the second phase transition structure is smaller than a size of the auxiliary electrode in a direction perpendicular to the substrate.

16. The OLED display substrate of claim 10 , wherein a material for forming the phase transition structure comprises one or a mixture of polyimide or polysiloxane containing azobenzene structure, polyimide containing a benzopyrylospiran structure, chlorinated polyethylene, and acryloyl-cinnamoyl-ethylene diester copolymer.

17. The OLED display substrate of claim 10 , wherein a material of the auxiliary electrode is at least one selected from molybdenum, aluminum, copper, silver and niobium, and a material of the pixel definition structure is selected from resin, polyimide, silicone or silica.

18. A display device, comprising a driving module, a system module, and a display module comprising the OLED display substrate of claim 10 .

Assignees

• Hefei Xinsheng Optoelectronics Technology Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Yao Gu
• Zhu Ruhui
• Duan Tingyuan

Classifications

• H10K71/421

  using coherent electromagnetic radiation, e.g. laser annealing · CPC title

• H10K59/80522

  combined with auxiliary electrodes · CPC title

• H10K71/00

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

• H10K59/122 Primary

  Pixel-defining structures or layers, e.g. banks · CPC title

• H01L27/3246

  Electricity · mapped topic