Unit of light-emitting elements and display device including the same
A unit of light-emitting elements includes: a plurality of light-emitting elements; and a binder extending around a periphery of the light-emitting elements and fixing the light-emitting elements. Each of the light-emitting elements includes: first and second semiconductor layers; and an active layer therebetween. A first semiconductor layer, an active layer, and a second semiconductor layer of a first light-emitting element are arranged along a first direction in this order, and a second semiconductor layer, an active layer, and a first semiconductor layer of a second light-emitting element are arranged along the first direction in this order.
1. A display device comprising:
a substrate;
a first electrode on the substrate;
a second electrode above the first electrode and spaced apart from the first electrode in a thickness direction of the substrate; and
a first unit of light-emitting elements and a second unit of light-emitting elements spaced apart from the first unit of light-emitting elements, the first and second units of light-emitting elements being between the first electrode and the second electrode,
wherein each of the first and second units unit of light-emitting elements comprises:
a plurality of light-emitting elements having a shape extended in a first direction and spaced apart from one another in a second direction perpendicular to the first direction, and
a binder extending around a periphery of the plurality of light-emitting elements and fixing the plurality of light-emitting elements,
wherein each of the plurality of light-emitting elements comprises a first semiconductor layer having one of an n-type or p-type conductivity, a second semiconductor layer having the other of the n-type or p-type conductivity, and an active layer between the first semiconductor layer and the second semiconductor layer,
wherein the plurality of light-emitting elements comprises:
a plurality of first light-emitting elements in which the first semiconductor layer, the active layer, and the second semiconductor layer are arranged along the first direction in this order, and
a plurality of second light-emitting elements in which the second semiconductor layer, the active layer, and the first semiconductor layer are arranged along the first direction in this order,
wherein the number of the plurality of first light-emitting elements is the same as the number of the plurality of second light-emitting elements in each of the first and second units of light-emitting elements, and
wherein the plurality of light-emitting elements in the first unit of light-emitting elements overlaps with the first electrode, and
wherein a first group of light-emitting elements from among the plurality of light-emitting elements in the second unit of light-emitting elements overlap with the first electrode and a second group of the light-emitting elements from among the plurality of light-emitting elements in the second unit of light-emitting elements do not overlap with the first electrode.
2. The display device of claim 1 , wherein the first direction and the thickness direction of the substrate are parallel to each other.
3. The display device of claim 1 , wherein each of the light-emitting elements in the first unit of light-emitting elements and in the first group of light-emitting elements has a first end electrically connected to the first electrode and a second end electrically connected to the second electrode.
4. The display device of claim 3 , wherein the first end of each of the light-emitting elements is at a lower end thereof along the first direction, and
wherein the second end of each of the light-emitting elements is at an upper end thereof along the first direction.
5. The display device of claim 4 , wherein the first end of each of the light-emitting elements in the first unit of light-emitting elements and in the first group of light-emitting elements contacts the first electrode, and the second end of each of the light-emitting elements in the first unit of light-emitting elements and in the first group of light-emitting elements contacts the second electrode.
6. The display device of claim 3 , further comprising a first insulating layer extending around at least one area of a periphery of the first and second units unit of light-emitting elements and on the first electrode,
wherein the second electrode is on the first insulating layer.
7. The display device of claim 6 , wherein the first insulating layer exposes the second end of each of the light-emitting elements.
8. The display device of claim 1 , wherein a thickness of the binder in the first direction is smaller than a length of the light-emitting elements in the first direction.
9. The display device of claim 8 , wherein the binder exposes both ends of each of the light-emitting elements.
10. The display device of claim 9 , wherein the first light-emitting element and the second light-emitting element are alternately arranged along the second direction.
11. The display device of claim 1 , wherein the second electrode overlaps the first electrode in the thickness direction of the substrate.
12. The display device of claim 1 , wherein at least one light-emitting element in the second group of light-emitting elements in the second unit of light-emitting elements has both ends thereof not electrically connected to the first electrode and the second electrode.