Display device

1. A display device, comprising:

a substrate; and

a light emitting unit disposed on the substrate, wherein the light emitting unit comprises an electrode electrically connected to a semiconductor layer;

wherein the electrode has a first surface farthest from the semiconductor layer, the semiconductor layer has a second surface adjacent to the electrode, and a roughness of the first surface is greater than a roughness of the second surface.

2. The display device according to claim 1 , wherein the light emitting unit further comprises an another semiconductor layer having a third surface adjacent to the electrode, and wherein the roughness of the first surface is greater than a roughness of the third surface.

3. The display device according to claim 2 , wherein the light emitting unit further comprises an another electrode, and wherein the another electrode has a surface farthest from the another semiconductor layer and contacting at least a portion of a scattering layer.

4. The display device according to claim 3 , wherein the scattering layer comprises transparent particles.

5. The display device according to claim 3 , wherein the another semiconductor layer is between the semiconductor layer and the another electrode.

6. The display device according to claim 3 , wherein the scattering layer covers a sidewall of the another electrode and a sidewall of the another semiconductor layer.

7. The display device according to claim 3 , further comprising a conductive layer below and electrically connected to the another electrode.

8. The display device according to claim 7 , wherein the scattering layer is disposed on the conductive layer.

9. The display device according to claim 1 , further comprising a scattering layer over the light emitting unit, wherein an overlapping region is between the scattering layer and the light emitting unit as viewed from a top-view perspective, and wherein a roughness of a surface of the scattering layer corresponding to the overlapping region greater than a roughness of a surface of the scattering layer without corresponding to the overlapping region.

10. The display device according to claim 9 , wherein the scattering layer comprises inorganic materials or organic materials.

11. The display device according to claim 10 , wherein the organic materials comprise epoxy.

12. The display device according to claim 10 , wherein the scattering layer comprises quantum dots transparent particles.

13. The display device according to claim 1 , further comprising an insulating layer disposed on the substrate and adjacent to the light emitting unit.

14. The display device according to claim 13 , wherein a thickness of the insulating layer adjacent to a sidewall of the light emitting unit is greater than a thickness of the insulating layer adjacent to a bottom of the light emitting unit.

15. The display device according to claim 13 , further comprising a common line disposed on the insulating layer.

16. The display device according to claim 15 , further comprising a conductive layer electrically connected between the light emitting unit and the common line.

17. The display device according to claim 1 , further comprising a conductive layer in contact with the electrode of the light emitting unit, and wherein the conductive layer has a surface adjacent to the first surface and the surface of the conductive layer is a rough surface.

18. The display device according to claim 1 , further comprising a conductive layer in contact with the electrode of the light emitting unit, and wherein the conductive layer has a surface farthest from the first surface and the surface of the conductive layer is a substantially smooth surface.

19. The display device according to claim 1 , further comprising a thin film transistor disposed between the substrate and the light emitting unit.

20. The display device according to claim 19 , further comprising a conductive layer disposed and electrically connected between the thin film transistor and the light emitting unit.