# US 11,114,515 B2 · Organic light-emitting diode display panel and manufacturing method thereof

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- Number: US 11,114,515 B2
- Document ID: US11114515B2
- Status: Granted
- Kind: B2
- Application number: 16/621,946
- Filed: 2019-11-04
- Published: 2021-01-28
- Granted: 2021-09-07
- Earliest claimed: 2019-07-23
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Bo Yan
- Web page: https://patentgrep.com/patent/US11114515B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 71/16: using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
- H10K 59/873: {Encapsulations}
- H10K 2102/311: {Flexible OLED}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light-emitting diode (OLED) display panel and a manufacturing method thereof are provided. The OLED display panel includes a substrate, a pixel defining layer, an organic light-emitting layer, and an organic encapsulating layer. The pixel defining layer is disposed on the substrate and includes a plurality of recessed regions and a plurality of grooves. The recessed regions communicate with each other through the grooves. The recessed regions and the grooves form a mesh structure. The mesh structure defines a plurality of pixel regions. The organic light-emitting layer is disposed on the pixel defining layer and the organic encapsulating layer is disposed on the organic light-emitting layer.

## Claims

### Claim 1

An organic light-emitting diode (OLED) display panel, comprising:
a substrate;
a pixel defining layer disposed on the substrate, wherein the pixel defining layer comprises a plurality of recessed regions and a plurality of grooves, wherein the recessed regions communicate with each other through the grooves, the recessed regions and the grooves form a mesh structure, the mesh structure defines a plurality of pixel regions, and widths of the recessed regions is greater than widths of the grooves, a depth of the grooves from the substrate is lower than a depth of the recessed regions from the substrate, such that a height difference between a bottom of the recessed regions and a bottom of the grooves is formed;
an organic light-emitting layer disposed on the pixel defining layer, wherein the organic light-emitting layer defines the grooves; and
an organic encapsulation layer disposed on the organic light-emitting layer;
wherein the widths and the depths of the grooves are configured, such that a plurality of organic encapsulation droplets are spread via capillary force, and the organic encapsulation droplets are used for manufacturing the organic encapsulation layer.

### Claim 2 (depends on 1)

The OLED display panel of claim 1, wherein the widths of the grooves are greater than 1 μm, and the depths of the grooves range from 0.01 μm to 1.5 μm.

### Claim 3 (depends on 1)

The OLED display panel of claim 1, wherein a thickness of the organic encapsulation layer ranges 0.01 μm to 10 μm.

### Claim 4 (depends on 1)

The OLED display panel of claim 1, wherein the OLED display panel further comprises an anode layer disposed at bottoms of the recessed regions.

### Claim 5 (depends on 4)

The OLED display panel of claim 4, wherein the OLED display panel further comprises an array layer disposed on the substrate, wherein the pixel defining layer is disposed on the array layer, the array layer comprises a drain electrode, and the drain electrode is disposed to correspond to the anode layer and connects the anode layer.

### Claim 6 (depends on 5)

The OLED display panel of claim 5, wherein the array layer further comprises a first dielectric layer, a second dielectric layer, and a planarization layer, which are disposed on the substrate in sequence, the first dielectric layer comprises a source and a drain, the second dielectric layer comprises a gate, and the drain electrode is disposed between the planarization layer and the second dielectric layer.

### Claim 7

A manufacturing method of an organic light-emitting diode (OLED) display panel, comprising steps of:
forming a pixel defining layer;
performing a patterning process on the pixel defining layer to form a plurality of recessed regions and a plurality of grooves, wherein the recessed regions communicate with each other through the grooves, the recessed regions and the grooves form a mesh structure, and the mesh structure defines a plurality of the pixel regions, a depth of the grooves from the substrate is lower than a depth of the recessed regions from the substrate, such that a height difference between a bottom of the recessed regions and a bottom of the grooves is formed;
evaporating an organic light-emitting layer on the pixel defining layer, wherein the organic light-emitting layer defines the grooves; and
adding a plurality of organic encapsulation droplets on the organic light-emitting layer, wherein the organic encapsulation droplets are spread via capillary force to form an organic encapsulation layer.

### Claim 8

An organic light-emitting diode (OLED) display panel, comprising:
a substrate;
a pixel defining layer disposed on the substrate, wherein the pixel defining layer comprises a plurality of recessed regions and a plurality of grooves, the recessed regions communicate with each other through the grooves, the recessed regions and the grooves form a mesh structure, and the mesh structure defines the pixel regions, a depth of the grooves from the substrate is lower than a depth of the recessed regions from the substrate, such that a height difference between a bottom of the recessed regions and a bottom of the grooves is formed;
an organic light-emitting layer disposed on the pixel defining layer an organic light-emitting layer disposed on the pixel defining layer, wherein the organic light-emitting layer defines the grooves; and
an organic encapsulation layer disposed on the organic light-emitting layer.

### Claim 9 (depends on 8)

The OLED display panel of claim 8, wherein the widths of the grooves are greater than 1 μm and the depths of the grooves range from 0.01 μm to 1.5 μm.

### Claim 10 (depends on 8)

The OLED display panel of claim 8, wherein a thickness of the organic encapsulation layer ranges 0.01 μm to 10 μm.

### Claim 11 (depends on 8)

The OLED display panel of claim 8, wherein the OLED display panel further comprises an anode layer disposed at bottoms of the recessed regions.

### Claim 12 (depends on 11)

The OLED display panel of claim 11, wherein the OLED display panel further comprises an array layer disposed on the substrate, wherein the pixel defining layer is disposed on the array layer, the array layer comprises a drain electrode, and the drain electrode is disposed to correspond to the anode layer and connects to the anode layer.

### Claim 13 (depends on 12)

The OLED display panel of claim 12, wherein the array layer further comprises: a first dielectric layer, a second dielectric layer, and a planarization layer which are disposed on the substrate in sequence, the first dielectric layer comprises a source and a drain, the second dielectric layer comprises a gate, and the drain electrode is disposed between the planarization layer and the second dielectric layer.