Display panel and display device

• US 10,784,461 B2
• Filed: 05/30/2019
• Issued: 09/22/2020
• Est. Priority Date: 08/17/2018
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Hefei Xinsheng Optoelectronics Technology Company Limited
• Inventors: Wang, Xinzhu, Hu, Youyuan, Li, Fei, Wu, Xinfeng, Li, Huihui
• Primary Examiner(s): Yi, Changhyun
• Application Number:
  US16/426,014
• Publication Number:
  US 20200058896A1
• Time in Patent Office: 481 Days
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 50/824 combined with auxiliary electrodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• 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 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• 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

The disclosure discloses a display panel and a display device, and the display panel includes: a base substrate, a drive wire layer on the base substrate, a planarization layer on a side of the drive wire layer facing away from the base substrate, a plurality of anodes in a form of an array on a side of the planarization layer facing away from the drive wire layer, a light-emitting layer on sides of respective anodes and the planarization layer facing away from the drive wire layer, and a transparent cathode layer on a side of the light-emitting layer facing away from the respective anodes, where the planarization layer includes grooves between the respective anodes, and auxiliary cathodes on a surface of the transparent cathode layer on a side thereof facing away from the light-emitting layer are arranged in the grooves.

Claims

1. A display panel, comprising:

a base substrate;

a drive wire layer on the base substrate;

a planarization layer on a side of the drive wire layer facing away from the base substrate;

a plurality of anodes in a form of an array on a side of the planarization layer facing away from the drive wire layer;

a light-emitting layer on sides of the plurality of anodes and the planarization layer facing away from the drive wire layer; and

a transparent cathode layer on a side of the light-emitting layer facing away from the plurality of anodes;

wherein the planarization layer comprises grooves between respective anodes;

the display panel further comprises auxiliary cathodes, in the grooves, on a surface of the transparent cathode layer on a side thereof facing away from the light-emitting layer; and

a material of the auxiliary cathodes is an opaque conductive adhesive with conductive particles dispersed therein.

2. The display panel according to claim 1, wherein the conductive particles comprise one or more of gold, silver, copper, aluminum, zinc, iron, nickel, or graphite.

3. The display panel according to claim 1, wherein surfaces of the auxiliary cathodes on sides thereof facing away from the base substrate are flush with a surface of the transparent cathode layer, outside the grooves, on a side thereof facing away from the base substrate;

or

surfaces of the auxiliary cathodes on sides thereof facing away from the base substrate are lower than a surface of the transparent cathode layer, outside the grooves, on a side thereof facing away from the base substrate.

4. The display panel according to claim 1, wherein the display panel further comprises:

an encapsulation cover plate on a side of the transparent cathode layer facing away from the light-emitting layer, and a color filter layer on a surface of the encapsulation cover plate on a side thereof facing the transparent cathode layer; and

the color filter layer comprises;

color filter blocks corresponding to the plurality of anodes in a one-to-one manner, and light-shielding layers between respective color filter blocks.

5. The display panel according to claim 4, wherein orthographic projections of the light-shielding layers onto the base substrate lie into orthographic projections of the auxiliary cathodes onto the base substrate;

and

widths of the auxiliary cathodes in the grooves are greater than or equal to widths of corresponding light-shielding layers.

6. The display panel according to claim 4, wherein thicknesses of the light-shielding layers are greater than thicknesses of the respective color filter blocks;

and

the light-shielding layers come into contact with auxiliary cathodes corresponding thereto in position, and gaps exist between the respective color filter blocks and the transparent cathode layer.

7. The display panel according to claim 1, wherein the display panel further comprises:

an encapsulation layer on a surface of the transparent cathode layer on a side thereof facing away from the light-emitting layer, and a color filter layer on a surface of the encapsulation layer on a side thereof facing away from the transparent cathode layer; and

the color filter layer comprises;

color filter blocks corresponding to the plurality of anodes in a one-to-one manner, and light-shielding layers between respective color filter blocks.

8. The display panel according to claim 7, wherein orthographic projections of the light-shielding layers onto the base substrate lie into orthographic projections of the auxiliary cathodes onto the base substrate;

and

widths of the auxiliary cathodes in the grooves are greater than or equal to widths of corresponding light-shielding layers.

9. The display panel according to claim 7, wherein the light-shielding layers come into contact with auxiliary cathodes corresponding thereto in position;

and

orthographic projections of the encapsulation layer and the light-shielding layers onto the base substrate do not overlap with each other.

10. The display panel according to claim 1, wherein at least one of the plurality of anodes comprises:

a reflection layer on a surface of the planarization layer on a side thereof facing away from the drive wire layer, and a transparent conductive layer on a surface of the reflection layer on a side thereof facing away from the planarization layer; and

the transparent conductive layer is only on the surface of the reflection layer, or is on both the surface of the reflection layer and a surface of an inner sidewall of a corresponding groove.

11. A display device, comprising a display panel, wherein the display panel comprises:

a base substrate;

a drive wire layer on the base substrate;

a planarization layer on a side of the drive wire layer facing away from the base substrate;

a plurality of anodes in a form of an array on a side of the planarization layer facing away from the drive wire layer;

a light-emitting layer on sides of the plurality of anodes and the planarization layer facing away from the drive wire layer; and

a transparent cathode layer on a side of the light-emitting layer facing away from the plurality of anodes;

wherein the planarization layer comprises grooves between respective anodes;

the display panel further comprises auxiliary cathodes, in the grooves, on a surface of the transparent cathode layer on a side thereof facing away from the light-emitting layer; and

a material of the auxiliary cathodes is an opaque conductive adhesive with conductive particles dispersed therein.

12. The display device according to claim 11, wherein the conductive particles comprise one or more of gold, silver, copper, aluminum, zinc, iron, nickel, or graphite.

13. The display device according to claim 11, wherein surfaces of the auxiliary cathodes on sides thereof facing away from the base substrate are flush with a surface of the transparent cathode layer, outside the grooves, on a side thereof facing away from the base substrate;

or

surfaces of the auxiliary cathodes on sides thereof facing away from the base substrate are lower than a surface of the transparent cathode layer, outside the grooves, on a side thereof facing away from the base substrate.

14. The display device according to claim 11, wherein the display panel further comprises:

an encapsulation cover plate on a side of the transparent cathode layer facing away from the light-emitting layer, and a color filter layer on a surface of the encapsulation cover plate on a side thereof facing the transparent cathode layer; and

the color filter layer comprises;

color filter blocks corresponding to the plurality of anodes in a one-to-one manner, and light-shielding layers between respective color filter blocks;

or

the display panel further comprises;

an encapsulation layer on a surface of the transparent cathode layer on a side thereof facing away from the light-emitting layer, and a color filter layer on a surface of the encapsulation layer on a side thereof facing away from the transparent cathode layer; and

the color filter layer comprises;

color filter blocks corresponding to the plurality of anodes in a one-to-one manner, and light-shielding layers between respective color filter blocks.

15. The display device according to claim 14, wherein orthographic projections of the light-shielding layers onto the base substrate lie into orthographic projections of the auxiliary cathodes onto the base substrate;

and

widths of the auxiliary cathodes in the grooves are greater than or equal to widths of corresponding light-shielding layers.

16. The display device according to claim 14, wherein when the display panel further comprises the encapsulation cover plate on the side of the transparent cathode layer facing away from the light-emitting layer, and the color filter layer on the surface of the encapsulation cover plate on the side thereof facing the transparent cathode layer, thicknesses of the light-shielding layers are greater than thicknesses of the respective color filter blocks;

and

the light-shielding layers come into contact with auxiliary cathodes corresponding thereto in position, and gaps exist between the respective color filter blocks and the transparent cathode layer.

17. The display device according to claim 14, wherein when the display panel further comprises the encapsulation layer on the surface of the transparent cathode layer on the side thereof facing away from the light-emitting layer, and the color filter layer on the surface of the encapsulation layer on the side thereof facing away from the transparent cathode layer, the light-shielding layers come into contact with auxiliary cathodes corresponding thereto in position;

and

orthographic projections of the encapsulation layer and the light-shielding layers onto the base substrate do not overlap with each other.

18. The display device according to claim 11, wherein at least one of the plurality of anodes comprises:

a reflection layer on a surface of the planarization layer on a side thereof facing away from the drive wire layer, and a transparent conductive layer on a surface of the reflection layer on a side thereof facing away from the planarization layer; and

the transparent conductive layer is only on the surface of the reflection layer, or is on both the surface of the reflection layer and a surface of an inner sidewall of a corresponding groove.