# US 11,444,139 B2 · Display panel providing planarization layer on pixel defining layer around light emitting functional layer, display device, and manufacturing method of the display panel

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- Number: US 11,444,139 B2
- Document ID: US11444139B2
- Status: Granted
- Kind: B2
- Application number: 16/753,038
- Filed: 2019-11-18
- Published: 2021-03-04
- Granted: 2022-09-13
- Earliest claimed: 2019-08-28
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Lei Wang; Zesheng Chen
- Web page: https://patentgrep.com/patent/US11444139B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/126: Shielding, e.g. light-blocking means over the TFTs
- H10K 59/80515: {characterised by their shape}
- H10K 59/878: {comprising reflective means}
- H10K 59/1201: {Manufacture or treatment}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The present invention provides a display panel, a display device, and a manufacturing method of the display panel. The display panel includes a source drain layer, a first planarization layer, a second planarization layer, an anode layer, a light emitting functional layer, and a cathode layer which are sequentially stacked from bottom to top. The second planarization layer includes a light shielding structure and a first groove formed by the light shielding structure. The anode layer completely covers the first groove and is extended to cover a portion of the second planarization layer. The light emitting functional layer is disposed on the anode layer in the first groove.

## Claims

### Claim 1

A display panel, comprising:
a source drain layer;
a first planarization layer disposed on the source drain layer;
a second planarization layer patterned and disposed on the first planarization layer, wherein the second planarization layer comprises a light shielding structure and a first groove formed by the light shielding structure;
an anode layer disposed on the second planarization layer, wherein the anode layer completely covers the first groove and is extended to cover a portion of the second planarization layer;
a light emitting functional layer disposed on the anode layer in the first groove; and
a cathode layer disposed on the light emitting functional layer in the first groove.

### Claim 2 (depends on 1)

The display panel as claimed in claim 1, wherein an angle formed between a first inclined plane of the first groove and an upper surface of the first planarization layer ranges from 45° to 55°, and the first inclined plane is an inclined plane formed by the second planarization layer.

### Claim 3 (depends on 1)

The display panel as claimed in claim 1, further comprising:
a pixel defining layer disposed on the second planarization layer and the anode layer, wherein the first groove forms a second groove after partially filling the pixel defining layer, the second groove is disposed around the first groove, and the anode layer is exposed on a bottom surface of the second groove;
wherein the light emitting functional layer is disposed on the anode layer in the second groove; and
wherein the cathode layer is disposed on the light emitting functional layer in the second groove.

### Claim 4 (depends on 3)

The display panel as claimed in claim 3, wherein an angle formed between a second inclined plane of the second groove and an upper surface of the anode layer ranges from 45° to 55°, and the second inclined plane is an inclined plane formed by the pixel defining layer.

### Claim 5 (depends on 3)

The display panel as claimed in claim 3, wherein a cross-sectional shape of the first groove or a cross-sectional shape of the second groove is an inverted trapezoid.

### Claim 6 (depends on 1)

The display panel as claimed in claim 1, wherein a distance between the anode layer covering the first inclined plane of the first groove and the adjacent light emitting functional layer ranges from 1 um to 2 um.

### Claim 7 (depends on 1)

The display panel as claimed in claim 1, wherein a thickness of the second planarization layer ranges from 1 um to 1.5 um.

### Claim 8 (depends on 1)

A display device, comprising the display panel as claimed in claim 1.

### Claim 9

A manufacturing method of a display panel, comprising the following steps:
forming a source drain layer;
forming a first planarization layer on the source drain layer;
forming a second planarization layer on the first planarization layer and patterning the second planarization layer, wherein the patterned second planarization layer has a light shielding structure and a first groove is formed by the light shielding structure;
forming an anode layer on the second planarization layer, wherein the anode layer completely covers the first groove and is extended to cover a portion of the second planarization layer;
forming a light emitting functional layer on the anode layer in the first groove; and
forming a cathode layer on the light emitting functional layer in the first groove.

### Claim 10 (depends on 9)

The manufacturing method of the display panel as claimed in claim 9, wherein after the step of forming the anode layer and before the step of forming the light emitting functional layer further comprises:
forming a pixel definition layer on the second planarization layer and the anode layer, wherein the first groove forms a second groove after partially filling the pixel defining layer, the second groove is disposed around the first groove, and the anode layer is exposed on a bottom surface of the second groove;
wherein the light emitting function layer is disposed on the anode layer in the second groove, and the cathode layer is disposed on the light emitting function layer in the second groove.