Light emitting device and display device including the same
A light emitting device, includes: a substrate; a light emitting element on the substrate, the light emitting element having a first end portion and a second end portion arranged in a longitudinal direction; one or more partition walls disposed on the substrate, the one or more partition walls being spaced apart from the light emitting element; a first reflection electrode adjacent the first end portion of the light emitting element; a second reflection electrode adjacent the second end portion of the light emitting element; a first contact electrode connected to the first reflection electrode and the first end portion of the light emitting element; an insulating layer on the first contact electrode, the insulating layer having an opening exposing the second end portion of the light emitting element and the second reflection electrode to the outside; and a second contact electrode on the insulating layer.
1. A light emitting device, comprising:
a substrate;
a light emitting element on the substrate, the light emitting element having a first end portion and a second end portion arranged in a longitudinal direction;
one or more partition walls disposed on the substrate, the one or more partition walls being spaced apart from the light emitting element;
a first reflection electrode adjacent the first end portion of the light emitting element;
a second reflection electrode adjacent the second end portion of the light emitting element;
a first contact electrode directly connected to the first reflection electrode and the first end portion of the light emitting element;
an insulating layer on the first contact electrode, the insulating layer having an opening exposing the second end portion of the light emitting element and the second reflection electrode to the outside; and
a second contact electrode on the insulating layer, the second contact electrode being connected to the second reflection electrode and the second end portion of the light emitting element through the opening.
2. The light emitting device of claim 1 , wherein any one of the first and second reflection electrodes is on the partition wall.
3. The light emitting device of claim 2 , wherein the first and second reflection electrodes and the partition wall comprise different materials.
4. The light emitting device of claim 3 , wherein the partition wall includes an insulating material and the first and second reflection electrodes include a conductive material.
5. The light emitting device of claim 1 , wherein when viewed on a plane, the first contact electrode overlaps the first reflection electrode, and the second contact electrode overlaps the second reflection electrode.
6. The light emitting device of claim 1 , wherein the light emitting element is a light emitting diode shaped like a cylinder or a polyprism having a micro scale or a nano scale.
7. The light emitting device of claim 6 , wherein the light emitting element comprises:
a first conductive semiconductor layer in which a first conductive dopant is doped;
a second conductive semiconductor layer in which a second conductive dopant is doped; and
an active layer disposed between the first and second conductive semiconductor layers.
8. The light emitting device of claim 7 , wherein any one of the first and second contact electrodes includes a conductive material, of which a work function is less than 4.1 eV, and the other of the first and second contact electrodes includes a conductive material, of which a work function is larger than 7.5 eV.
9. The light emitting device of claim 1 , wherein each of the first and second reflection electrodes is on the partition wall.
10. The light emitting device of claim 1 , further comprising:
a support member between the substrate and the light emitting element.
11. The light emitting device of claim 10 , wherein the support member includes an insulating material.
12. The light emitting device of claim 1 , further comprising:
an insulating film on an outer circumferential surface of the light emitting element.
13. A display device, comprising:
a substrate including a pixel area;
a pixel in the pixel area and having one or more thin film transistors; and
a light emitting device on the thin film transistor and connected to the thin film transistor,
wherein the light emitting device comprises:
a plurality of light emitting elements on the substrate, the plurality of light emitting elements each having a first end portion and a second end portion arranged in a longitudinal direction;
one or more partition walls spaced apart from each of the plurality of light emitting elements;
a first reflection electrode adjacent the first end portion of each light emitting element;
a second reflection electrode adjacent the second end portion of each light emitting element;
a first contact electrode directly connected to the first reflection electrode and the first end portion;
an insulating layer on the first contact electrode, and having an opening exposing the second end portion and the second reflection electrode to the outside; and
a second contact electrode on the insulating layer and connected to the second reflection electrode and the second end portion through the opening, and
any one of the first and second reflection electrodes is connected to the thin film transistor.
14. The display device of claim 13 , wherein any one of the first and second reflection electrodes is on the partition wall.
15. The display device of claim 14 , wherein the first and second reflection electrodes and the partition wall include different materials.
16. The display device of claim 15 , wherein the partition wall includes an insulating material and the first and second reflection electrodes include a conductive material.
17. The display device of claim 13 , wherein when viewed on a plane, the first contact electrode overlaps the first reflection electrode, and the second contact electrode overlaps the second reflection electrode.
18. The display device of claim 13 , wherein each of the plurality of light emitting elements is a light emitting diode shaped like a cylinder or a polyprism having a micro scale or a nano scale.
19. The display device of claim 13 , wherein any one of the first and second contact electrodes includes a conductive material, of which a work function is less than 4.1 eV, and the other of the first and second contact electrodes includes a conductive material, of which a work function is larger than 7.5 eV.
20. The display device of claim 13 , wherein each of the first and second reflection electrodes is on the partition wall.