# US 12,604,646 B2 · Display panel with inorganic encapsulation layer having multiple layers on inorganic absorption layer

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- Number: US 12,604,646 B2
- Document ID: US12604646B2
- Status: Granted
- Kind: B2
- Application number: 18/322,500
- Filed: 2023-05-23
- Published: 2024-01-25
- Granted: 2026-04-14
- Earliest claimed: 2022-07-20
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Seungyeon Jeong; Ohjeong Kwon; Su Jeong Kim; Taeho Kim; Hong-Jo Park; Hongyeon Lee
- Web page: https://patentgrep.com/patent/US12604646B2

## CPC

- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/873: {Encapsulations}
- H10K 59/8791: {Arrangements for improving contrast, e.g. preventing reflection of ambient light}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display panel includes a base layer, a light-emitting element layer on the base layer, a capping layer on the light-emitting element layer, an inorganic absorption layer on the capping layer, and having a refractive index of about 1.8 to about 3.0, and an encapsulation layer on the inorganic absorption layer, and including a first layer, a second layer, and a third layer that are sequentially stacked, wherein the first layer includes: a first sub layer on the inorganic absorption layer, and having a first refractive index of about 1.77 or more, and a second sub layer on the first sub layer, and having a second refractive index lower than the first refractive index.

## Claims

### Claim 1

A display panel comprising:
a base layer;
a light-emitting element layer on the base layer;
a capping layer on the light-emitting element layer;
an inorganic absorption layer on the capping layer, and having a refractive index of about 1.8 to about 3.0; and
an encapsulation layer on the inorganic absorption layer, and comprising a first layer, a second layer, and a third layer that are sequentially stacked,
wherein the first layer comprises:
a first sub layer on the inorganic absorption layer, and having a first refractive index of about 1.77 or more;
a second sub layer on the first sub layer, and having a second refractive index lower than the first refractive index; and
a third sub layer on the second sub layer, and having a third refractive index lower than the first refractive index or higher than the second refractive index.

### Claim 2 (depends on 1)

The display panel of claim 1, wherein the second refractive index is about 1.5 or less.

### Claim 3 (depends on 2)

The display panel of claim 2, wherein the first sub layer has a thickness of about 500 Å to about 600 Å or about 1500 Å to about 1750 Å, and the second sub layer has a thickness of about 7000 Å to about 10000 Å.

### Claim 4 (depends on 1)

The display panel of claim 1, wherein the second refractive index is about 1.5 or less, and the third refractive index is about 1.70 or less.

### Claim 5 (depends on 4)

The display panel of claim 4, wherein the third refractive index is about 0.

### Claim 6 (depends on 4)

The display panel of claim 4, wherein the first sub layer has a thickness of about 500 Å to about 600 Å, the second sub layer has a thickness of about 7000 Å to about 10000 Å, and the third sub layer has a thickness of about 550 Å to about 750 Å.

### Claim 7 (depends on 1)

The display panel of claim 1, wherein the third sub layer has a thickness of about 7000 Å to about 10000 Å.

### Claim 8 (depends on 7)

The display panel of claim 7, wherein the second refractive index is about 1.5 or less, and the third refractive index is about 1.65 or more.

### Claim 9 (depends on 7)

The display panel of claim 7, wherein the first sub layer has a thickness of about 500 Å to about 600 Å, and the second sub layer has a thickness of about 800 Å to about 2000 Å.

### Claim 10 (depends on 7)

The display panel of claim 7, wherein a refractive index of the capping layer is higher than the refractive index of the inorganic absorption layer, and a difference between the refractive index of the capping layer and the refractive index of the inorganic absorption layer is about 0.15 or more.

### Claim 11 (depends on 1)

The display panel of claim 1, wherein the first layer comprises silicon oxynitride (SiOxNy).

### Claim 12 (depends on 1)

The display panel of claim 1, wherein the inorganic absorption layer comprises bismuth (Bi).

### Claim 13

A display panel comprising:
a base layer;
a light-emitting element layer on the base layer;
a capping layer on the light-emitting element layer;
an inorganic absorption layer on the capping layer; and
an encapsulation layer on the inorganic absorption layer, and comprising a first layer, a second layer, and a third layer that are sequentially stacked,
wherein the first layer comprises a first sub layer and a second sub layer, each of the first and second sub layers comprising silicon oxynitride (SiOxNy), the silicon oxynitride (SiOxNy) of the first sub layer having a higher nitrogen content than the silicon oxynitride (SiOxNy) of the second sub layer.

### Claim 14 (depends on 13)

The display panel of claim 13, wherein the first sub layer has a first refractive index of about 1.77 or more, and has a thickness of about 500 Å to about 600 Å or about 1500 Å to about 1750 Å, and
wherein the second sub layer has a second refractive index of about 1.5 or less, and has a thickness of about 7000 Å to about 10000 Å.

### Claim 15 (depends on 13)

The display panel of claim 13, wherein the first layer further comprises a third sub layer comprising silicon oxynitride (SiOxNy), the first sub layer, the second sub layer, and the third sub layer are sequentially stacked on the inorganic absorption layer.

### Claim 16 (depends on 15)

The display panel of claim 15, wherein the silicon oxynitride (SiOxNy) of the third sub layer has a lower nitrogen content than the silicon oxynitride (SiOxNy) of the first sub layer.

### Claim 17 (depends on 15)

The display panel of claim 15, wherein the silicon oxynitride (SiOxNy) of the third sub layer has a higher nitrogen content than the silicon oxynitride (SiOxNy) of the second sub layer.

### Claim 18 (depends on 16)

The display panel of claim 16, wherein the first sub layer has a thickness of about 500 Å to about 600 Å, the second sub layer has a thickness of about 7000 Å to about 10000 Å, and the third sub layer has a thickness of about 550 Å to about 750 Å.

### Claim 19 (depends on 17)

The display panel of claim 17, wherein the first sub layer has a thickness of about 500 Å to about 600 Å, the second sub layer has a thickness of about 800 Å to about 2000 Å, and the third sub layer has a thickness of about 7000 Å to about 10000 Å.

### Claim 20

A display device comprising:
a display panel;
a sensor layer on the display panel; and
a light control layer on the sensor layer, and comprising at least one of a dye or a pigment,
wherein the display panel comprises:
a base layer,
a light-emitting element layer on the base layer,
an inorganic absorption layer on the light-emitting element layer, and
an encapsulation layer on the inorganic absorption layer, and comprising at least one inorganic layer and at least one organic layer, the at least one inorganic layer comprising:
a first sub inorganic layer having a first refractive index of about 1.77 or more; and
a second sub inorganic layer on the first sub inorganic layer, and having a second refractive index lower than the first refractive index, and
wherein the encapsulation layer comprises:
a first inorganic layer on the inorganic absorption layer, and comprising the first sub inorganic layer and the second sub inorganic layer;
an organic layer on the first inorganic layer.

### Claim 21 (depends on 20)

The display device of claim 20, wherein the encapsulation layer further comprises:
a second inorganic layer on the organic layer.

### Claim 22 (depends on 21)

The display device of claim 21, wherein the first inorganic layer further comprises a third sub inorganic layer on the second sub inorganic layer, and the first inorganic layer has a third refractive index lower than the first refractive index or having a fourth refractive index higher than the second refractive index, and the first sub inorganic layer is directly on the inorganic absorption layer.