OLED display panel, a method for fabricating the same, and a display device

• US 11,049,917 B2
• Filed: 03/18/2019
• Issued: 06/29/2021
• Est. Priority Date: 04/12/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Zhao, Na, Deng, Liyun, Zhou, Bin
• Primary Examiner(s): Yushin, Nikolay K
• Application Number:
  US16/494,359
• Publication Number:
  US 20210050394A1
• Time in Patent Office: 834 Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/1315 comprising structures specially adapted for lowering the resistance
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

This disclosure relates to the field of display technologies, and discloses an OLED display panel, a method for fabricating the same, and a display device, and the OLED display device includes: a first substrate; a pixel definition layer located on the first substrate, and including a plurality of hollow light-emitting areas, and first recessed sections located between adjacent light-emitting areas; a cathode layer located on a side of the pixel definition layer away from the first substrate, and comprising corresponding second recessed sections corresponding in position to the first recessed sections; and electrically conductive sections located on a side of the cathode layer away from the pixel definition layer, and located in the second recessed sections.

Claims

1. An OLED display panel, comprising:

a first substrate;

a pixel definition layer located on the first substrate, the pixel definition layer comprising a plurality of hollow light-emitting areas, and first recessed sections located between adjacent light-emitting areas;

a cathode layer located on a side of the pixel definition layer away from the first substrate, the cathode layer comprising corresponding second recessed sections corresponding in position to the first recessed sections;

electrically conductive sections located on a side of the cathode layer away from the pixel definition layer, and located in the second recessed sections;

a second substrate arranged opposite to the first substrate; and

spacers located on a side of the second substrate facing the first substrate;

wherein normal projections of the electrically conductive sections onto the first substrate cover normal projections of the spacers onto the first substrate.

2. The OLED display panel according to claim 1, wherein the first recessed sections are formed by etching the pixel definition layer.

3. The OLED display panel according to claim 2, wherein the pixel definition layer further comprises blocking sections located between the first recessed sections and the light-emitting areas;

and

a depth of the first recessed sections is a half of a thickness of the blocking sections.

4. The OLED display panel according to claim 1, wherein the OLED display panel further comprises a passivation layer located between the first substrate and the pixel definition layer;

there are third recessed sections at the passivation layer at positions corresponding to the first recessed sections; and

the first recessed sections are formed by recessing the pixel definition layer at the third recessed sections.

5. The OLED display panel according to claim 1, wherein the OLED display panel further comprises a passivation layer located between the first substrate and the pixel definition layer;

there are third recessed sections at the passivation layer at positions corresponding to the first recessed sections; and

the first recessed sections are formed by recessing the pixel definition layer at the third recessed sections, and etching the pixel definition layers at the positions.

6. The OLED display panel according to claim 5, wherein the OLED display panel further comprises:

thin film transistors located between the first substrate and the passivation layer;

anodes located between the passivation layer and the pixel definition layer; and

an organic function layer located between the pixel definition layer and the cathode layer.

7. The OLED display panel according to claim 1, wherein a thickness of the electrically conductive sections is equal to a depth of the second recessed sections.

8. The OLED display panel according to claim 1, wherein a resistivity of the electrically conductive sections is not larger than a resistivity of the cathode layer.

9. The OLED display panel according to claim 8, wherein a material of the electrically conductive sections comprises nanometer silver.

10. The OLED display panel according to claim 1, wherein a material of the electrically conductive sections comprises PEDOT/PSS or poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate).

11. The OLED display panel according to claim 1, wherein the OLED display panel further comprises an assistant electrode layer on sides of the spacers away from the second substrate;

and

the assistant electrode layer contacts with the electrically conductive sections at positions corresponding to the spacers.

12. The OLED display panel according to claim 11, wherein the OLED display panel further comprises:

black matrixes located between the second substrate and the spacers;

a color filter layer located between the black matrix and the spacers;

a planarization layer located between the color filter layer and the spacers; and

a filling layer located on a side of the assistant electrode layer away from the planarization layer;

normal projections of the black matrixes onto the first substrate cover normal projections of the electrically conductive sections onto the first substrate.

13. A display device, comprising an OLED display panel, the OLED display panel comprising:

a first substrate;

a pixel definition layer located on the first substrate, the pixel definition layer comprising a plurality of hollow light-emitting areas, and first recessed sections located between adjacent light-emitting areas;

a cathode layer located on a side of the pixel definition layer away from the first substrate, the cathode layer comprising corresponding second recessed sections corresponding in position to the first recessed sections;

electrically conductive sections located on a side of the cathode layer away from the pixel definition layer, and located in the second recessed sections;

a second substrate arranged opposite to the first substrate; and

spacers located on a side of the second substrate facing the first substrate;

wherein normal projections of the electrically conductive sections onto the first substrate cover normal projections of the spacers onto the first substrate.

14. A method for fabricating an OLED display panel, wherein the OLED display panel comprises:

a first substrate;

a pixel definition layer located on the first substrate, the pixel definition layer comprising a plurality of hollow light-emitting areas, and first recessed sections located between adjacent light-emitting areas;

a cathode layer located on a side of the pixel definition layer away from the first substrate, the cathode layer comprising corresponding second recessed sections corresponding in position to the first recessed sections;

electrically conductive sections located on a side of the cathode layer away from the pixel definition layer, and located in the second recessed sections;

a second substrate arranged opposite to the first substrate; and

spacers located on a side of the second substrate facing the first substrate;

wherein normal projections of the electrically conductive sections onto the first substrate cover normal projections of the spacers onto the first substrate; and

,

wherein the method comprises;

providing the first substrate;

forming the pixel definition layer on the first substrate, the pixel definition layer comprising the plurality of hollow light-emitting areas, and the first recessed sections located between the adjacent light-emitting areas;

forming the cathode layer located on the side of the pixel definition layer away from the first substrate, wherein the cathode layer comprises the corresponding second recessed sections corresponding in position to the first recessed sections; and

forming the electrically conductive sections in the second recessed sections.

15. The method according to claim 14, wherein forming the pixel definition layer on the first substrate comprises:

forming the pixel definition layer on the first substrate through inkjet printing.

16. The method according to claim 15, wherein forming the pixel definition layer on the first substrate comprises:

forming a pixel insulation layer on the first substrate; and

masking, exposing, and etching the pixel insulation layer using a half-tone mask,

wherein light-all-transmitting areas of the half-tone mask correspond in position to the light-emitting areas, and light-semi-transmitting areas of the half-tone mask correspond in position to the first recessed sections.