Display apparatus
A display apparatus includes a driving substrate, a plurality of light-emitting devices, and a plurality of metal common electrodes. The light-emitting devices are dispersedly disposed on the driving substrate, and each of the light-emitting devices includes an epitaxial structure and a first type electrode and a second type electrode disposed on the epitaxial structure. The metal common electrodes are dispersedly disposed on the driving substrate and in contact with a portion of the second type electrode of each of the light-emitting devices to form an ohmic contact.
1. A display apparatus, comprising:
a driving substrate;
a plurality of light-emitting devices dispersedly disposed on the driving substrate, each of the light-emitting devices comprising an epitaxial structure and a first type electrode and a second type electrode disposed on the epitaxial structure; and
a plurality of metal common electrodes dispersedly disposed on the driving substrate and being in contact with a portion of the second type electrode of each of the light-emitting devices to form an ohmic contact.
2. The display apparatus as claimed in claim 1 , wherein a specific value of ratio of a contact area of the metal common electrodes in contact with an upper surface of each of the second type electrodes to the area of the upper surface of each of the second type electrodes is less than and equal to 0.5.
3. The display apparatus as claimed in claim 1 , wherein the metal common electrodes comprise a plurality of first type metal common electrodes and a plurality of second type metal common electrodes, and a material of each of the first type metal common electrodes is different from a material of each of the second type metal common electrodes.
4. The display apparatus as claimed in claim 3 , wherein the material of the first type metal common electrodes includes gold, germanium, nickel, or an alloy combining the foregoing materials, and the material of the second type metal common electrodes includes titanium, aluminum, or an alloy combining the foregoing materials.
5. The display apparatus as claimed in claim 4 , wherein each of the light-emitting devices that the first type metal common electrodes are correspondingly in contact with has a first dominant light-emitting wavelength, each of the light-emitting devices that the second type metal common electrodes are correspondingly in contact with has a second dominant light-emitting wavelength, and the first dominant light-emitting wavelength is greater than the second dominant light-emitting wavelength.
6. The display apparatus as claimed in claim 5 , wherein each of the light-emitting devices that the first type metal common electrodes are correspondingly in contact with is a red light emitting device, and each of the light-emitting devices that the second type metal common electrodes are correspondingly in contact with is a blue light emitting device or a green light emitting device.
7. The display apparatus as claimed in claim 1 , further comprising:
a plurality of bonding pads disposed on the driving substrate and located between the first type electrode of each of the light-emitting devices and the driving substrate.
8. The display apparatus as claimed in claim 7 , further comprising:
an insulation layer disposed on the driving substrate and covering the bonding pads and the epitaxial structure and the first type electrode of each of the light-emitting devices, the metal common electrodes covering on the insulation layer, wherein a thickness of the insulation layer is less than a thickness of each of the light-emitting devices.
9. The display apparatus as claimed in claim 1 , wherein the epitaxial structure comprises a first type semiconductor layer, an light-emitting layer, and a second type semiconductor layer, the light-emitting layer is located between the first type semiconductor layer and the second type semiconductor layer, the first type electrode is electrically connected to the first type semiconductor layer, and the second type electrode is electrically connected to the second type semiconductor layer.
10. The display apparatus as claimed in claim 9 , wherein the metal common electrodes cover one side surface of each of the light-emitting layers.
11. The display apparatus as claimed in claim 1 , wherein each of the metal common electrodes has a first vertical height in vertical section, each of the metal common electrodes and the driving substrate have a second vertical height in vertical section, and a specific value of ratio of the first vertical height to the second vertical height is between 0.3 and 1.
12. The display apparatus as claimed in claim 1 , wherein the metal common electrodes cover one side surface of each of the light-emitting devices.
13. The display apparatus as claimed in claim 1 , wherein each of the metal common electrodes comprises a first metal common electrode and a second metal common electrode, and the first metal common electrode and the second metal common electrode respectively cover two side surfaces of each of the light-emitting devices.
14. The display apparatus as claimed in claim 1 , wherein the metal common electrodes cover a surrounding of each of the light-emitting devices.
15. The display apparatus as claimed in claim 1 , further comprising:
a transparent conductive layer disposed on the metal common electrodes and covering at least the metal common electrodes and the light-emitting devices.