# US 11,114,514 B2 · Organic electroluminescent display panel, manufacturing method thereof, and display device

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- Number: US 11,114,514 B2
- Document ID: US11114514B2
- Status: Granted
- Kind: B2
- Application number: 16/608,919
- Filed: 2019-03-12
- Published: 2021-04-22
- Granted: 2021-09-07
- Earliest claimed: 2018-04-11
- Assignees: Hefei Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Hefei BOE Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Kui Gong; Xianxue Duan; Zhihai Zhang
- Web page: https://patentgrep.com/patent/US11114514B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/80522: {combined with auxiliary electrodes}
- H10K 71/135: {using ink-jet printing}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic electroluminescent display panel is provided, including a pixel defining layer. The pixel defining layer includes a plurality of openings and a bank surrounding each of the plurality of openings and defining a plurality of pixel areas. The bank is composed of a hydrophilic material pattern layer and a conductive hydrophobic pattern layer which are stacked from bottom to top.

## Claims

### Claim 1

An organic electroluminescent display panel, comprising:
a pixel defining layer disposed on a substrate, the pixel defining layer comprising a plurality of openings and a bank surrounding each of the openings and defining a plurality of pixel areas, wherein:
the bank is composed of a hydrophilic material pattern layer and a conductive hydrophobic pattern layer which are stacked from bottom to top over the substrate;
the conductive hydrophobic pattern layer comprises a hydrophobic resin, a photosensitizer, and a conductive material,
the conductive material comprises at least one of carbon nanotubes and graphene, and the mass percentage content of the conductive material is 5% to 20% of the conductive hydrophobic pattern layer by mass.

### Claim 2 (depends on 1)

The organic electroluminescent display panel according to claim 1, wherein the hydrophilic material pattern layer comprises silicon dioxide.

### Claim 3 (depends on 1)

The organic electroluminescent display panel according to claim 1, wherein a height of the hydrophilic material pattern layer is ½ to ⅔ of a height of the bank.

### Claim 4 (depends on 1)

The organic electroluminescent display panel according to claim 1, wherein an opening area of the pixel defining layer is provided with an organic electroluminescent device functional layer, and an organic electroluminescent device cathode layer is disposed over the organic electroluminescent device functional layer and the bank of the pixel defining layer.

### Claim 5

A manufacturing method of an organic electroluminescent display panel, comprising:
providing an organic light-emitting diode (OLED) array substrate;
forming a hydrophilic material layer on the OLED array substrate;
forming a conductive hydrophobic layer on the hydrophilic material layer;
patterning the conductive hydrophobic layer to form a conductive hydrophobic pattern layer; and
taking fluorine-based gas as a working gas and the conductive hydrophobic pattern layer as an anti-etching layer, plasma-etching the hydrophilic material layer to form a hydrophilic material pattern layer and a conductive hydrophobic pattern layer having superhydrophobicity, wherein:
the hydrophilic material pattern layer and the conductive hydrophobic pattern layer having superhydrophobicity form a pixel defining layer comprising a plurality of openings and a plurality of banks;
the conductive hydrophobic pattern layer comprises a hydrophobic resin, a photosensitizer, and a conductive material;
the conductive material comprises at least one of carbon nanotubes and graphene, and the mass percentage content of the conductive material is 5% to 20% of the conductive hydrophobic layer by mass.

### Claim 6 (depends on 5)

The manufacturing method according to claim 5, wherein the hydrophilic material layer comprises silicon dioxide.

### Claim 7 (depends on 5)

The manufacturing method according to claim 5, further comprising:
inkjet printing to form an OLED functional layer; and
forming an OLED cathode layer on the OLED functional layer.

### Claim 8

A display device comprising an organic electroluminescent display panel, the organic electroluminescent display panel comprising:
a pixel defining layer disposed on a substrate, the pixel defining layer comprising a plurality of openings and a bank surrounding each opening and defining a plurality of pixel areas, wherein:
the bank is composed of a hydrophilic material pattern layer and a conductive hydrophobic pattern layer which are stacked from bottom to top over the substrate;
the conductive hydrophobic pattern layer comprises a hydrophobic resin, a photosensitizer, and a conductive material; and
the conductive material comprises at least one of carbon nanotubes and graphene, and the mass percentage content of the conductive material is 5% to 20% of the conductive hydrophobic pattern layer by mass.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein the hydrophilic material pattern layer comprises silicon dioxide.

### Claim 10 (depends on 8)

The display device according to claim 8, wherein a height of the hydrophilic material pattern layer is ½ to ⅔ of a height of the bank.

### Claim 11 (depends on 8)

The display device according to claim 8, wherein an opening area of the pixel defining layer is provided with an organic electroluminescent device functional layer, and an organic electroluminescent device cathode layer is disposed over the organic electroluminescent device functional layer and the bank of the pixel defining layer.