# US 12,113,150 B2 · Structure of micro light-emitting device and method of transferring micro light-emitting device

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- Number: US 12,113,150 B2
- Document ID: US12113150B2
- Status: Granted
- Kind: B2
- Application number: 17/518,771
- Filed: 2021-11-04
- Published: 2022-05-12
- Granted: 2024-10-08
- Earliest claimed: 2020-11-06
- Assignees: Korea University Research and Business Foundation
- Applicants: Korea University Research and Business Foundation
- Inventors: In Hwan Lee; Gyu Cheol Kim
- Web page: https://patentgrep.com/patent/US12113150B2

## CPC

- H10H 20/819: characterised by their shape, e.g. curved or truncated substrates
- H10H 20/821: of the light-emitting regions, e.g. non-planar junctions
- H10H 20/817: characterised by the crystal structures or orientations, e.g. polycrystalline, amorphous or porous
- H10H 20/831: characterised by their shape
- H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls
- H10H 29/10: Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 (active-matrix LED displays H10H29/30)
- H10H 20/01: Manufacture or treatment
- H10H 20/032: {of electrodes}
- H10H 20/034: {of coatings}
- H10H 20/832: characterised by their material
- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- H10W 72/0198: {batch processes}
- H10W 90/00: Package configurations
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

The present disclosure relates to the structure of a micro light-emitting device and an alignment substrate. The light-emitting device according to one embodiment includes an inclined side surface having a three-dimensional shape. The inclined side surface is formed to protrude from one surface of the micro light-emitting device, has magnetism, and includes two different electrodes formed in one direction. In this case, among the two electrodes, one electrode may be formed on a mesa portion, and the other electrode may be formed on the inclined side surface.

## Claims

### Claim 1

A three-dimensional shaped micro light-emitting device comprising:
a structure including an inclined side surface, p-contact, p-GaN, n-contact, n-GaN, a substrate, and a wind resistance structure,
wherein the inclined side surface has a circular cone shape or a pyramid shape,
wherein the structure including the inclined side surface has magnetism and protrudes from the p-GaN,
wherein the p-contact and the n-contact form a first electrode and a second electrode, respectively,
wherein the p-contact is disposed to contact the structure including the inclined side surface,
wherein the n-contact is disposed on a mesa portion,
wherein the inclined side surface, the p-contact, the p-GaN, the n-contact, and the n-GaN are disposed on a first surface of the substrate, and the wind resistance structure is disposed on a second surface of the substrate opposite to the first surface of the substrate.

### Claim 2 (depends on 1)

The three-dimensional shaped micro light-emitting device according to claim 1, wherein the p-contact and the n-contact are simultaneously connected to an alignment substrate.

### Claim 3 (depends on 2)

The three-dimensional shaped micro light-emitting device according to claim 2, wherein a plurality of the three-dimensional shaped micro light-emitting devices are injected into a fluid and made into an ink, discharged at a specific location on the alignment substrate through inkjet printing technology, and
in the alignment substrate, the ink including the plurality of the three-dimensional shaped micro light-emitting devices is guided to a pattern on the alignment substrate by a magnetic field applied on a side opposite to another side for the plurality of the three-dimensional shaped micro light-emitting devices to be discharged.

### Claim 4 (depends on 1)

The three-dimensional shaped micro light-emitting device according to claim 1, wherein the structure including the inclined side surface includes a paramagnetic material to maintain a tip of the structure including the inclined side surface facing downward in response to a magnetic field and the paramagnetic material is included in the structure including the inclined side surface by at least one of the following ways: a first method of constituting the structure including the inclined side surface, and a second method of coating on the surface of the structure including the inclined side surface.

### Claim 5 (depends on 1)

The three-dimensional shaped micro light-emitting device according to claim 1, wherein the wind resistance structure includes resistance wings that progressively widen from the second surface of the substrate to a direction away from the second surface of the substrate, and guides the structure including the inclined side surface toward a direction of an alignment substrate by using difference in air resistance caused by the resistance wings.