Micro light emission element and image display device
Provided is a micro light emission element including a compound semiconductor in which an N-side layer, a light emission layer, and a P-side layer are laminated sequentially from a side of a light emitting surface, in which an N-electrode coupled to the N-side layer and a P-electrode coupled to the P-side layer are disposed on another surface opposite to the light emitting surface, the P-electrode is disposed on the light emission layer, the N-electrode is disposed in an isolation region which is a boundary region of the micro light emission element and isolates the light emission layer from a light emission layer of another micro light emission element, a surface of the N-electrode on a side of the other surface and a surface of the P-electrode on the side of the other surface are flush with each other, and the N-electrode and the P-electrode are both formed of a single interconnection layer.
1. A micro light emission element comprising:
a compound semiconductor in which a first conductive layer, a light emission layer, and a second conductive layer having a conductivity type opposite to a conductivity type of the first conductive layer are sequentially laminated from a side of a light emitting surface, wherein
a first electrode coupled to the first conductive layer and a second electrode coupled to the second conductive layer are disposed on another surface opposite to the light emitting surface,
the second electrode is disposed on the light emission layer,
the first electrode is disposed in an isolation region which is a boundary region of the micro light emission element and isolates the light emission layer from a light emission layer of another micro light emission element,
a surface of the first electrode on a side of the other surface and a surface of the second electrode on the side of the other surface are flush with each other and are made of an identical material,
in the first electrode, a first metal material is disposed on the side of the light emitting surface, and a second metal material is disposed on the side of the other surface, and
the first metal material has a higher reflectance as compared to the second metal material.
2. The micro light emission element according to claim 1 , wherein
the micro light emission element is formed of a single interconnection layer.
3. The micro light emission element according to claim 1 , wherein
the micro light emission element is coupled to at least part of the other micro light emission element.
4. The micro light emission element according to claim 1 , wherein
the compound semiconductor of the micro light emission element is completely separated from the compound semiconductor of the other micro light emission element.
5. The micro light emission element according to claim 1 , wherein
the first electrode covers a periphery of the micro light emission element.
6. The micro light emission element according to claim 1 , wherein
the first electrode reaches the light emitting surface.
7. The micro light emission element according to claim 1 , wherein
the micro light emission element is a light emitting diode, and
a side wall of an isolation trench isolating the light emission layer from the light emission layer of the other micro light emission element is inclined in a range of 45°±10° with respect to a surface of the light emission layer.
8. The micro light emission element according to claim 1 , wherein
the micro light emission element has a plurality of second electrodes coupled to the second conductive layer.
9. The micro light emission element according to claim 1 , wherein
sidewalls of an N-side layer and a mesa of the micro light emission element are covered with a protection layer, and a reflective metal material is disposed outside the protection layer.
10. The micro light emission element according to claim 9 , wherein
the metal material is the first electrode.
11. The micro light emission element according to claim 1 , wherein
sidewalls of an N-side layer and a mesa of the micro light emission element are covered with a protection layer, and the first metal material is disposed outside the protection layer.
12. The micro light emission element according to claim 1 , wherein
the micro light emission element has a laser diode structure of a vertical resonator surface light emitting laser.
13. An image display device comprising:
the micro light emission element according to claim 1 disposed on a drive circuit substrate, wherein
the second electrode and the first electrode of the micro light emission element are coupled to a corresponding second drive electrode and a corresponding first drive electrode on the drive circuit substrate, respectively.
14. The image display device according to claim 13 , wherein
the compound semiconductor is disposed on an entire surface of the image display device.
15. The image display device according to claim 13 , wherein
an external coupling portion is provided on the light emitting surface of the compound semiconductor.
16. The image display device according to claim 13 , wherein
the image display device has a region where an electrode is disposed on one of a side of the micro light emission element and a side of the drive circuit substrate side, at a bonding surface of the micro light emission element and the drive circuit substrate.