Micro light emitting device and display apparatus
A micro light emitting device includes an epitaxial structure and a first type electrode. The epitaxial structure includes a first type semiconductor layer, a light emitting layer and a second type semiconductor layer. The light emitting layer is disposed between the first type semiconductor layer and the second type semiconductor layer. The first type semiconductor layer has a first accommodating cavity. The first type electrode is disposed on the first accommodating cavity. A maximum width of the first type electrode is greater than or equal to a maximum width of an upper surface of the first type semiconductor layer.
1. A micro light emitting device, comprising:
an epitaxial structure comprising a first type semiconductor layer, a light emitting layer and a second type semiconductor layer, wherein the light emitting layer is disposed between the first type semiconductor layer and the second type semiconductor layer, and the first type semiconductor layer has a first accommodating cavity; and
a first type electrode disposed on the first accommodating cavity, wherein a maximum width of the first type electrode is greater than or equal to a maximum width of an upper surface of the first type semiconductor layer,
wherein the first accommodating cavity has a first depth, and a ratio of the first depth to a maximum height of the epitaxial structure is greater than 0 and less than or equal to 0.5.
2. The micro light emitting device as recited in claim 1 , wherein the first type electrode is disposed on a portion of a peripheral surface of the first type semiconductor layer.
3. The micro light emitting device as recited in claim 1 , wherein the first type electrode has a second accommodating cavity, and the second accommodating cavity has a first width, and a ratio of the first width to a maximum width of the epitaxial structure is greater than or equal to 0.6 and less than 1.
4. The micro light emitting device as recited in claim 1 , wherein the maximum width of the first type electrode is greater than or equal to a maximum width of the epitaxial structure.
5. The micro light emitting device as recited in claim 4 , wherein a width of the first type semiconductor layer is greater than or equal to a width of the second type semiconductor layer.
6. The micro light emitting device as recited in claim 1 , wherein the maximum width of the first type electrode is smaller than a maximum width of the epitaxial structure.
7. The micro light emitting device as recited in claim 6 , wherein a width of the first type semiconductor layer is smaller than or equal to a width of the second type semiconductor layer.
8. A display apparatus, comprising:
a driving substrate;
a plurality of bonding pads dispersedly disposed on the driving substrate; and
a plurality of micro light emitting devices dispersedly disposed on the driving substrate and corresponding to the plurality of bonding pads respectively, wherein each of the plurality of micro light emitting devices comprises:
an epitaxial structure comprising a first type semiconductor layer, a light emitting layer and a second type semiconductor layer, wherein the light emitting layer is disposed between the first type semiconductor layer and the second type semiconductor layer, and the first type semiconductor layer has a first accommodating cavity, and the first accommodating cavity and the driving substrate define a space; and
a first type electrode disposed on the first accommodating cavity of the first type semiconductor layer and located between the space and the first accommodating cavity, wherein the first type electrode is electrically connected to a corresponding bonding pad among the plurality of bonding pads,
wherein the first accommodating cavity has a first depth, and a ratio of the first depth to a maximum height of the epitaxial structure is greater than 0 and less than or equal to 0.5.
9. The display apparatus as recited in claim 8 , wherein the first type electrode of the each of the plurality of micro light emitting devices directly contacts the driving substrate.
10. The display apparatus as recited in claim 8 , wherein the first type electrode is disposed on a portion of a peripheral surface of the first type semiconductor layer.
11. The display apparatus as recited in claim 8 , further comprising:
a protective layer disposed on the driving substrate and between the plurality of micro light emitting devices, wherein an air gap exists between the protective layer, the first type electrode, the plurality of bonding pads and the driving substrate.
12. The display apparatus as recited in claim 8 , wherein a distance between the first type electrode and the adjacent first type electrode is smaller than a width of the first type electrode.
13. The display apparatus as recited in claim 8 , wherein a maximum width of the first type electrode is greater than or equal to a maximum width of an upper surface of the first type semiconductor layer.
14. The display apparatus as recited in claim 13 , wherein the maximum width of the first type electrode is greater than or equal to a maximum width of the epitaxial structure.
15. The display apparatus as recited in claim 13 , wherein the maximum width of the first type electrode is smaller than a maximum width of the epitaxial structure.
16. The display apparatus as recited in claim 8 , wherein an orthogonal projection area of the first type electrode on the driving substrate is smaller than or equal to an orthogonal projection area of the corresponding bonding pad on the driving substrate.
17. The display apparatus as recited in claim 16 , wherein an orthogonal projection area of each of the plurality of micro light emitting devices on the driving substrate is smaller than or equal to an orthogonal projection area of the corresponding first type electrode on the driving substrate.