OLED with a shape memory alloy bottom electrode, method for manufacturing the same, and display apparatus including the OLED

Patent metadata

Field	Value
Publication number	US-11825699-B2
Application number	US-202017267082-A
Country	US
Kind code	B2
Filing date	May 20, 2020
Priority date	May 23, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

There is provided an organic light-emitting diode including: a pixel defining layer on a substrate and having a plurality of openings for defining pixel regions, wherein each pixel region is a region including one pixel therein; a plurality of first pixel electrodes on the substrate and in the plurality of openings, respectively, each first pixel electrode being at a peripheral portion of a corresponding opening adjacent to the pixel defining layer; and a plurality of second pixel electrodes on the substrate and in the plurality of openings, respectively, each second pixel electrode being at a central portion of the corresponding opening. Each first pixel electrode is between the pixel defining layer and a corresponding second pixel electrode, and the plurality of first pixel electrodes and the plurality of second pixel electrodes are in a same layer. Each first pixel electrode includes a shape memory alloy material.

First claim

What is claimed is:

1. An organic light-emitting diode, comprising:
a pixel defining layer on a substrate and having a plurality of openings for defining pixel regions, wherein each of the pixel regions is a region comprising one pixel therein;
a plurality of first pixel electrodes on the substrate and in the plurality of openings, respectively, each of the plurality of first pixel electrodes being at a peripheral portion of a corresponding opening adjacent to the pixel defining layer; and
a plurality of second pixel electrodes on the substrate and in the plurality of openings, respectively, each of the plurality of second pixel electrodes being at a central portion of the corresponding opening,
wherein each of the plurality of first pixel electrodes is between the pixel defining layer and a corresponding one of the plurality of second pixel electrodes, and the plurality of first pixel electrodes and the plurality of second pixel electrodes are in a same layer, and
wherein each of the plurality of first pixel electrodes comprises a shape memory alloy material.

2. The organic light-emitting diode according to claim 1 , wherein the shape memory alloy material is configured to form a protrusion during a drying process of ink-jet printing.

3. The organic light-emitting diode according to claim 1 , wherein the shape memory alloy material comprises at least one of an iron-nickel alloy material and a titanium-nickel alloy material.

4. The organic light-emitting diode according to claim 1 , further comprising:
an organic functional layer in each of the plurality of openings and on the first and second pixel electrodes.

5. The organic light-emitting diode according to claim 4 , wherein the organic functional layer comprises a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

6. A method for manufacturing an organic light-emitting diode, comprising:
forming a second pixel electrode layer on a substrate;
forming a first photoresist layer on the second pixel electrode layer and patterning the first photoresist layer to form a patterned first photoresist layer;
patterning the second pixel electrode layer to obtain a second pixel electrode;
forming a first pixel electrode layer covering the patterned first photoresist layer and the second pixel electrode on the substrate;
forming a second photoresist layer on the first pixel electrode layer and patterning the second photoresist layer;
removing a portion of the first pixel electrode layer exposed by a patterned second photoresist layer to obtain a first pixel electrode that surrounds the second pixel electrode;
removing the patterned first photoresist layer and the patterned second photoresist layer; and
forming a pixel defining layer on a portion, on which the first and second pixel electrodes are not formed, of the substrate in a pixel region, wherein in a direction perpendicular to the substrate, the pixel defining layer has a thickness greater than each of a thickness of the first pixel electrode and a thickness of the second pixel electrode, such that the pixel defining layer forms an opening accommodating the first and second pixel electrodes,
wherein the first pixel electrode comprises a shape memory alloy material.

7. The method according to claim 6 , further comprising:
forming an organic functional layer covering the first and second pixel electrodes in the opening.

8. The method according to claim 7 , wherein the forming an organic functional layer comprises: an ink-jet printing process and a drying process, wherein the first pixel electrode protrudes to have a first shape different from an original shape of the first pixel electrode during the drying process, such that a portion of ink of the organic functional layer at the first pixel electrode flows toward the second pixel electrode.

9. The method according to claim 8 , wherein the first shape of the first pixel electrode is restored to the original shape when the ink-jet printing process and the drying process are finished.

10. The method according to claim 6 , wherein the shape memory alloy material is selected from at least one of an iron-nickel alloy material and a titanium-nickel alloy material.

11. The method according to claim 7 , wherein the forming an organic functional layer comprises: forming a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer in sequence.

12. The method according to claim 6 , wherein the patterning the first photoresist layer comprises:
exposing and developing the first photoresist layer.

13. The method according to claim 6 , wherein the patterning the second photoresist layer comprises:
exposing and developing the second photoresist layer.

14. A display apparatus, comprising the organic light-emitting diode according to claim 1 .

15. The organic light-emitting diode according to claim 2 , wherein the shape memory alloy material comprises at least one of an iron-nickel alloy material and a titanium-nickel alloy material.

16. The organic light-emitting diode according to claim 2 , further comprising:
an organic functional layer in each of the plurality of openings and on the first and second pixel electrodes.

17. The organic light-emitting diode according to claim 3 , further comprising:
an organic functional layer in each of the plurality of openings and on the first and second pixel electrodes.

18. The organic light-emitting diode according to claim 15 , further comprising:
an organic functional layer in each of the plurality of openings and on the first and second pixel electrodes.

19. The organic light-emitting diode according to claim 16 , wherein the organic functional layer comprises a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

20. The organic light-emitting diode according to claim 17 , wherein the organic functional layer comprises a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Hou Wenjun

Classifications

• H10K59/8051

  Anodes · CPC title

• H10K59/122 Primary

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

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/16

  Electron transporting layers · CPC title

• H10K50/171

  Electron injection layers · CPC title