Light emitting device and manufacturing method of the light emitting device
A light-emitting device includes: a substrate; a unit light-emitting area disposed on the substrate; first and second electrodes disposed in the unit light-emitting area to be separated from each other; a plurality of rod-shaped LEDs disposed between the first and second electrodes; a reflective contact electrode disposed on opposite ends of the rod-shaped LEDs to electrically connect the rod-shaped LEDs to the first and second electrodes; and a light-transmitting structure disposed between the first and second electrodes and extending to cross the rod-shaped LEDs.
1. A light-emitting device, comprising:
a light-emitting diode (LED) disposed on a base layer, the LED having a first end and a second end opposite to the first end;
a first electrode in direct contact with the first end of the LED and covering a first end portion of the LED so as to be directly over the LED; and
a second electrode in direct contact with the second end of the LED and covering a second end portion of the LED so as to be directly over the LED, wherein
the first electrode and the second electrode are separated from each other, and
the first electrode and the second electrode are directly disposed on a top surface of a same layer.
2. The light-emitting device of claim 1 , further comprising:
a third electrode disposed between the first electrode and the base layer and partially overlapping the first electrode on a plan view; and
a fourth electrode disposed between the second electrode and the base layer and partially overlapping the second electrode on the plan view.
3. The light-emitting device of claim 2 , wherein
the first end of the LED is disposed between the first electrode and the third electrode, and
the second end of the LED is disposed between the second electrode and the fourth electrode.
4. The light-emitting device of claim 3 , further comprising a light transmitting structure disposed on the LED, wherein
the light-transmitting structure is disposed between the third electrode and the fourth electrode.
5. The light-emitting device of claim 4 , wherein the first and second electrodes are disposed on a same layer.
6. The light-emitting device of claim 4 , wherein the light-transmitting structure is disposed between the first electrode and the second electrode such that the light-transmitting structure does not overlap a distal end of the first electrode that faces towards a center of the LED and overlaps a distal end of the second electrode that faces towards the center of the LED from the plan view.
7. The light-emitting device of claim 4 , wherein the light-transmitting structure comprises scatterers.
8. The light-emitting device of claim 7 , wherein the scatterers include at least one of TiO2 and SiO2.
9. The light-emitting device of claim 8 , wherein the light-transmitting structure further comprises a silicone resin within which the scatterers are distributed.
10. The light-emitting device of claim 4 , wherein the light-transmitting structure has a top surface with a dome shape.
11. The light-emitting device of claim 4 , wherein the light-transmitting structure has a top surface with a rough surface in the form of protrusions and depressions.
12. The light-emitting device of claim 4 , wherein the light-transmitting structure does not directly contact either of the first electrode or the second electrode.
13. The light-emitting device of claim 4 , wherein the light-transmitting structure extends directly below a center of the LED.
14. The light-emitting device of claim 2 , further comprising an insulating film that covers at least part of a side surface of the LED between the first end and the second end of the LED, but does not cover at least opposite ends of the LED.
15. The light-emitting device of claim 14 , wherein the opposite ends of the LED not covered by the insulating film are electrically connected to the third electrode and the fourth electrode via the first electrode and the second electrode.
16. The light-emitting device of claim 14 , wherein the first electrode partially covers the insulating film on the first end portion of the LED, and
wherein the second electrode partially covers the insulating film on the second end portion of the LED.
17. The light-emitting device of claim 1 , wherein the LED comprises:
a first semiconductor layer in the first end portion;
a second semiconductor layer in the second end portion; and
an active layer between the first semiconductor layer and the second semiconductor layer in a direction parallel to the base layer.
18. The light-emitting device of claim 1 , wherein
the LED is rod-shaped with a length of the LED parallel to a main surface of the base layer, the rod-shape having a first distil end and a second distil end opposite the first distil end,
a direction between the first distil end and the second distil end is parallel to the main surface of the base layer,
the first electrode in direct contact with the first distil end of the LED; and
the second electrode in direct contact with the second distil end of the LED.