Structure of micro light-emitting device and method of transferring micro light-emitting device
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.
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.
2. 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.
3. 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.
4. 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.
5. 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.