# US 12,113,153 B2 · Display device

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- Number: US 12,113,153 B2
- Document ID: US12113153B2
- Status: Granted
- Kind: B2
- Application number: 17/674,500
- Filed: 2022-02-17
- Published: 2022-10-20
- Granted: 2024-10-08
- Earliest claimed: 2021-04-19
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., LTD.
- Inventors: Hyun Kim; Jeong Su Park; Jong Chan Lee; Hyun Wook Lee; Jung Eun Hong
- Web page: https://patentgrep.com/patent/US12113153B2

## CPC

- H10W 90/00: Package configurations
- H10H 20/8312: {extending at least partially through the bodies}
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout}
- H10K 59/873: {Encapsulations}
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device includes an electrode layer including a first electrode and a second electrode that are spaced apart from each other and disposed on a substrate, a light emitting element between the first electrode and the second electrode, and a capping layer disposed on the light emitting element and including at least one low refractive layer and at least one high refractive layer that are alternately disposed. The capping layer includes a first low refractive layer on the electrode layer and the light emitting element, a first high refractive layer on the first low refractive layer, and a second low refractive layer on the first high refractive layer. A thickness of the first low refractive layer is greater than a thickness of the second low refractive layer.

## Claims

### Claim 1

A display device comprising:
an electrode layer including a first electrode and a second electrode that are spaced apart from each other and disposed on a substrate;
a light emitting element between the first electrode and the second electrode; and
a capping layer disposed on the light emitting element and including at least one low refractive layer and at least one high refractive layer that are alternately disposed, wherein
the capping layer comprises:
a first low refractive layer on the electrode layer and the light emitting element;
a first high refractive layer on the first low refractive layer; and
a second low refractive layer on the first high refractive layer, and
a thickness of the first low refractive layer is greater than a thickness of the second low refractive layer.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the thickness of the first low refractive layer is about 1.5 times to about 20 times greater than the thickness of the second low refractive layer.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the capping layer further comprises:
a third low refractive layer between the first high refractive layer and the second low refractive layer; and
a second high refractive layer between the third low refractive layer and the second low refractive layer.

### Claim 4 (depends on 3)

The display device of claim 3, wherein the capping layer further comprises:
a fourth low refractive layer between the second high refractive layer and the second low refractive layer; and
a third high refractive layer between the fourth low refractive layer and the second low refractive layer.

### Claim 5 (depends on 2)

The display device of claim 2, wherein
the light emitting element has a shape extending in one direction,
a longitudinal direction of the light emitting element is parallel to the substrate, and
the thickness of the first low refractive layer is greater than a width of the light emitting element.

### Claim 6 (depends on 5)

The display device of claim 5, wherein
the light emitting element comprises:
a first semiconductor layer;
a second semiconductor layer spaced apart from the first semiconductor layer; and
an element active layer between the first semiconductor layer and the second semiconductor layer,
the first semiconductor layer, the element active layer, and the second semiconductor layer are sequentially disposed in the longitudinal direction of the light emitting element, and
a length of the first semiconductor layer and a length of the second semiconductor layer are different from each other.

### Claim 7 (depends on 2)

The display device of claim 2, further comprising a second high refractive layer disposed on the second low refractive layer,
wherein a thickness of the second high refractive layer is smaller than the thickness of the first low refractive layer.

### Claim 8 (depends on 1)

The display device of claim 1, wherein the thickness of the first low refractive layer is greater than a thickness of the first high refractive layer.

### Claim 9 (depends on 1)

The display device of claim 1, wherein each of the at least one low refractive layer and the at least one high refractive layer include an inorganic material.

### Claim 10 (depends on 1)

The display device of claim 1, wherein
a refractive index of the at least one low refractive layer is in a range of about 1.3 to about 1.6, and
a refractive index of the at least one high refractive layer is in a range of about 1.7 to about 2.4.

### Claim 11 (depends on 1)

The display device of claim 1, wherein the capping layer covers the electrode layer and the light emitting element.

### Claim 12 (depends on 11)

The display device of claim 11, further comprising a contact electrode on the light emitting element, wherein
the capping layer is disposed on the contact electrode, and
the contact electrode comprises:
a first contact electrode electrically connecting the first electrode to an end of the light emitting element; and
a second contact electrode spaced apart from the first contact electrode and electrically connecting the second electrode to another end of the light emitting element.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the capping layer covers the contact electrode.

### Claim 14 (depends on 1)

The display device of claim 1, further comprising an insulating layer on the electrode layer, wherein
the insulating layer includes a stepped structure formed between the first electrode and the second electrode, and
the light emitting element overlaps the stepped structure on the insulating layer.

### Claim 15 (depends on 14)

The display device of claim 14, wherein
a separation space is formed between the light emitting element and the insulating layer due to the stepped structure of the insulating layer, and
a portion of the first low refractive layer is disposed in the separation space.

### Claim 16 (depends on 15)

The display device of claim 15, wherein the first low refractive layer contacts the light emitting element in the separation space.

### Claim 17

A display device comprising:
a first electrode and a second electrode that are spaced apart from each other and disposed on a substrate;
a plurality of light emitting elements between the first electrode and the second electrode; and
a capping layer on the plurality of light emitting elements, wherein
the capping layer comprises:
a first inorganic layer having a first refractive index;
a second inorganic layer on the first inorganic layer and having a second refractive index; and
a third inorganic layer on the second inorganic layer and having a third refractive index,
the second refractive index is greater than the first refractive index and the third refractive index, and
a thickness of the first inorganic layer is greater than a thickness of the third inorganic layer.

### Claim 18 (depends on 17)

The display device of claim 17, wherein the capping layer covers the first electrode, the second electrode, and the plurality of light emitting elements.

### Claim 19 (depends on 17)

The display device of claim 17, wherein the thickness of the first inorganic layer is about 1.5 times to about 20 times greater than the thickness of the third inorganic layer.

### Claim 20 (depends on 17)

The display device of claim 17, wherein the thickness of the first inorganic layer is greater than a thickness of the second inorganic layer.