# US 12,016,199 B2 · Display device

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- Number: US 12,016,199 B2
- Document ID: US12016199B2
- Status: Granted
- Kind: B2
- Application number: 18/333,515
- Filed: 2023-06-12
- Published: 2023-11-02
- Granted: 2024-06-18
- Earliest claimed: 2020-03-30
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Hyun Gue Song; Hee Seong Jeong; Sun Hwa Kim; Hyun Ho Jung; Sang Min Hong
- Web page: https://patentgrep.com/patent/US12016199B2

## CPC

- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 59/124: Insulating layers formed between TFT elements and OLED elements
- H10K 59/8731: {multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers}
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes: a substrate; a display element on the substrate; a capping layer on the display element; an optical layer on the capping layer, and including: a first optical layer on the display element; and a second optical layer on the first optical layer; and a thin film encapsulation layer on the optical layer, and including: a first inorganic encapsulation layer on the second optical layer; an auxiliary layer on the first inorganic encapsulation layer; an organic encapsulation layer on the auxiliary layer; and a second inorganic encapsulation layer on the organic encapsulation layer. A refractive index of the second optical layer is smaller than a refractive index of the capping layer, and a refractive index of the first optical layer is between the refractive index of the second optical layer and the refractive index of the capping layer.

## Claims

### Claim 1

A display device comprising:
a substrate;
a display element on the substrate;
a capping layer on the display element;
a first inorganic layer on the capping layer;
a second inorganic layer on the first inorganic layer;
a third inorganic layer on the second inorganic layer;
a fourth inorganic layer on the third inorganic layer;
an organic layer on the fourth inorganic layer; and
a fifth inorganic layer on the organic layer,
wherein a refractive index of the second inorganic layer is different from a refractive index of the capping layer, and
wherein a refractive index of the first inorganic layer is between the refractive index of the second inorganic layer and the refractive index of the capping layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the refractive index of the first inorganic layer is in a range from 1.62 to 1.89, and a thickness of the first inorganic layer is in a range from 20 nm to 60 nm.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the refractive index of the second inorganic layer is in a range from 1.45 to 1.62, and a thickness of the second inorganic layer is in a range from 40 nm to 100 nm.

### Claim 4 (depends on 1)

The display device of claim 1, wherein the refractive index of the capping layer is in a range from 1.6 to 2.3, and a thickness of the capping layer is in a range from 30 nm to 120 nm.

### Claim 5 (depends on 1)

The display device of claim 1, wherein a thickness of the fourth inorganic layer is in a range from 30 nm to 100 nm, and a thickness of the third inorganic layer is in a range from 400 nm to 2200 nm.

### Claim 6 (depends on 5)

The display device of claim 5, wherein:
the fourth inorganic layer is interposed between the third inorganic layer and the organic layer;
a refractive index of the third inorganic layer is greater than a refractive index of the fourth inorganic layer; and
the refractive index of the fourth inorganic layer is between the refractive index of the third inorganic layer and a refractive index of the organic layer.

### Claim 7 (depends on 6)

The display device of claim 6, wherein the refractive index of the fourth inorganic layer satisfies:
min(n1,n2)+|n2−n1|×0.25<n3<min(n1,n2)+|n2−n1|×0.75,
where n3 represents the refractive index of the fourth inorganic layer, n1 represents the refractive index of the third inorganic layer, n2 represents the refractive index of the organic layer, min(n1, n2) represents a minimum value of n1 or n2, and |n2−n1| represents an absolute value of a difference between n2 and n1.

### Claim 8 (depends on 1)

The display device of claim 1, wherein the display element comprises light emitting diodes.

### Claim 9 (depends on 1)

The display device of claim 1, further comprising:
a lower layer interposed between the fourth inorganic layer and the organic layer,
wherein the lower layer comprises an inorganic insulating material.

### Claim 10 (depends on 9)

The display device of claim 9, wherein the lower layer directly contacts the organic layer.

### Claim 11 (depends on 9)

The display device of claim 9, wherein:
a refractive index of the fourth inorganic layer is greater than a refractive index of the organic layer, and
a refractive index of the lower layer is between the refractive index of the fourth inorganic layer and the refractive index of the organic layer.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the refractive index of the fourth inorganic layer satisfies:
min(n1,n2)+|n2−n1|×0.25<n3<min(n1,n2)+|n2−n1|×0.75,
where n3 represents the refractive index of the fourth inorganic layer, n1 represents a refractive index of the third inorganic layer, n2 represents the refractive index of the lower layer, min(n1, n2) represents a minimum value of n1 or n2, and |n2−n1| represents an absolute value of a difference between n2 and n1.

### Claim 13 (depends on 11)

The display device of claim 11, wherein:
a difference between the refractive index of the lower layer and the refractive index of the organic layer is less than 0.05.

### Claim 14 (depends on 13)

The display device of claim 13, wherein:
the lower layer and the fourth inorganic layer comprise an inorganic insulating material comprising a silicon element, a nitrogen element, and an oxygen element; and
an oxygen content of the lower layer is greater than an oxygen content of the fourth inorganic layer.

### Claim 15 (depends on 1)

The display device of claim 1, wherein the third inorganic layer comprises a plurality of stacked films.

### Claim 16 (depends on 1)

The display device of claim 1, wherein the refractive index of the second inorganic layer is smaller than the refractive index of the capping layer.