# US 12,225,774 B2 · Display device and method of manufacturing the same

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- Number: US 12,225,774 B2
- Document ID: US12225774B2
- Status: Granted
- Kind: B2
- Application number: 17/353,815
- Filed: 2021-06-22
- Published: 2022-06-09
- Granted: 2025-02-11
- Earliest claimed: 2020-12-04
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Pilsoon Hong; Jungi Kim; Junho Sim; Jaehun Lee; Yangho Jung
- Web page: https://patentgrep.com/patent/US12225774B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 50/844: Encapsulations
- H10K 50/865: {comprising light absorbing layers, e.g. light-blocking layers}
- H10K 59/8792: {comprising light absorbing layers, e.g. black layers}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 59/8723: {Vertical spacers, e.g. arranged between the sealing arrangement and the OLED}
- H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes a substrate, a first electrode disposed on the substrate, a first pixel-defining layer disposed on the first electrode, the first pixel-defining layer having a first opening exposing at least a portion of the first electrode and including a pigment, and a second pixel-defining layer disposed on the first pixel-defining layer and including a dye.

## Claims

### Claim 1

A display device comprising:
a substrate;
a first electrode disposed on the substrate;
a first pixel-defining layer disposed on the first electrode, the first pixel-defining layer having a first opening exposing at least a portion of the first electrode and comprising a negative photosensitive material and a black pigment; and
a second pixel-defining layer disposed on the first pixel-defining layer and comprising a positive photosensitive material and a black dye, wherein the first pixel-defining layer has an optical density of 1 or more, and
an optical density of the second pixel-defining layer is less than an optical density of the first pixel-defining layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein:
the first pixel-defining layer comprises a plurality of particles, and
an average size of the plurality of particles is about 200 nm or less.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the second pixel-defining layer has a second opening exposing at least a portion of the first electrode.

### Claim 4 (depends on 3)

The display device of claim 3, wherein a width of the first opening is greater than a width of the second opening.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the second pixel-defining layer covers an upper surface and a side surface of the first pixel-defining layer.

### Claim 6 (depends on 4)

The display device of claim 4, wherein the second pixel-defining layer is in direct contact with the first electrode.

### Claim 7 (depends on 1)

The display device of claim 1, further comprising a spacer disposed on the second pixel-defining layer,
wherein the spacer comprises a same material as the second pixel-defining layer.

### Claim 8 (depends on 7)

The display device of claim 7, wherein the first pixel-defining layer and the spacer are formed of different materials from each other.

### Claim 9 (depends on 3)

The display device of claim 3, further comprising:
an intermediate layer comprising an emission layer filling the second opening; and
a second electrode disposed on the intermediate layer.

### Claim 10 (depends on 9)

The display device of claim 9, further comprising a thin-film encapsulation layer disposed on the second electrode, the thin-film encapsulation layer comprising at least one inorganic layer and at least one organic layer.

### Claim 11 (depends on 10)

The display device of claim 10, further comprising an optical functional layer disposed on the thin-film encapsulation layer, the optical functional layer comprising a color filter at least partially overlapping the first opening and a black matrix surrounding the color filter.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the black matrix at least partially overlaps the first pixel-defining layer.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the black matrix at least partially overlaps the second pixel-defining layer.

### Claim 14

A display device comprising:
a plurality of pixels, each pixel comprising a pixel electrode; and
a pixel-defining layer disposed between the plurality of pixels to define the plurality of pixels,
wherein the pixel-defining layer comprises:
a first pixel-defining layer disposed to at least partially cover the pixel electrode and comprising a negative photosensitive material and a black pigment; and
a second pixel-defining layer disposed on the first pixel-defining layer to at least partially cover the pixel electrode and comprising a positive photosensitive material and a black dye,
the first pixel-defining layer has an optical density of 1 or more, and
an optical density of the second pixel-defining layer is less than an optical density of the first pixel-defining layer.

### Claim 15 (depends on 14)

The display device of claim 14, wherein a light transmittance of the first pixel-defining layer is substantially equal to or less than a light transmittance of the second pixel-defining layer.