Pixel defining layer with concave wall portion, display panel and display device

• US 10,833,136 B2
• Filed: 10/04/2018
• Issued: 11/10/2020
• Est. Priority Date: 01/12/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Cui, Ying
• Primary Examiner(s): Henry, Caleb E
• Application Number:
  US16/151,621
• Publication Number:
  US 20190221621A1
• Time in Patent Office: 768 Days
• Field of Search: 257 40
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks

Abstract

This disclosure provides a pixel defining layer, a display panel and a display device. The pixel defining layer comprises a pixel partition wall, wherein the pixel partition wall encloses a plurality of openings; wherein the pixel partition wall comprises a first layer, wherein the first layer is disposed on a base substrate, and wherein a sidewall of the first layer has a concave wall portion concave inward towards the pixel partition wall.

Claims

1. A display panel comprising:

a base substrate; and

a pixel defining layer and a light-emitting layer, wherein the pixel defining layer comprises;

a plurality of pixel partition walls, wherein two adjacent pixel partition walls of the plurality of pixel partition walls enclose an opening therebetween which defines a pixel region;

wherein each of the pixel partition walls comprises a first layer, wherein the first layer is disposed on a base substrate, and a sidewall of the first layer has a concave wall portion which is in direct contact with a light-emitting layer, the concave wall portion concave inward towards the pixel partition wall, wherein the first layer of the pixel defining layer is disposed on the base substrate.

2. The display panel according to claim 1, wherein the first layer is made of a hydrophilic material.

3. The display panel according to claim 2, wherein the hydrophilic material is at least one of silica and silicon nitride.

4. The display panel according to claim 1, wherein the concave wall portion extends from a bottom surface of the first layer to a top surface of the first layer opposite to the bottom surface, in a direction away from the base substrate.

5. The display panel according to claim 4, wherein the concave wall portion comprises a first edge connected with the top surface and a second edge connected with the bottom surface, and wherein an orthographical projection of the first edge on the base substrate is less than or equal to an orthographical projection of the second edge on the base substrate.

6. The display panel according to claim 1, wherein a cross section of the concave wall portion on a plane perpendicular to a plane where the base substrate is in is of a circular arc shape.

7. The display panel according to claim 1, wherein the pixel partition wall further comprises a second layer, wherein the second layer is disposed on a side of the first layer away from the base substrate, and wherein the second layer is made of a hydrophobic material.

8. The display panel according to claim 7, wherein the first layer is made of an inorganic hydrophilic material, and the second layer is made of an organic hydrophobic material.

9. The display panel according to claim 7, wherein the hydrophobic material is polyimide.

10. The display panel according to claim 1, wherein an orthographical projection of the opening on the base substrate is substantially circular.

11. The display panel according to claim 1, wherein an anode layer, the light-emitting layer and a cathode layer are arranged in this order on the base substrate, in a direction away from the base substrate, wherein the light-emitting layer is disposed in a space enclosed by the first layer, wherein the cathode layer is disposed on the light-emitting layer, and wherein an orthographical projection of a portion of the cathode layer in contact with the light-emitting layer on the base substrate is less than an orthographical projection of the light-emitting layer on the base substrate.

12. A display device comprising:

the display panel according to claim 1.

13. The display device according to claim 12, wherein an orthographical projection of the opening on the base substrate is substantially circular.

14. The display device according to claim 12, wherein an anode layer, a light-emitting layer and a cathode layer are arranged in this order on the base substrate, in a direction away from the base substrate wherein the light-emitting layer is disposed in a space enclosed by the first layer, wherein the cathode layer is disposed on the light-emitting layer, and wherein an orthographical projection of a portion of the cathode layer in contact with the light-emitting layer on the base substrate is less than an orthographical projection of the light-emitting layer on the base substrate.