LED element with an inverted taper structure for minimizing a defect rate of electrode connections, and display device using the same
A light-emitting device and a display including the same can improve the process stability during the process of disposing the light-emitting device. A light-emitting device includes the n-type semiconductor layer and the p-type semiconductor layer, and a structure is disposed so as to minimize electrical short between electrodes even if the light-emitting device is misaligned. The structure may have at least one side surface in an inverted taper shape and may be disposed between electrodes to minimize a short-circuit therebetween during the process of connecting the electrodes.
1. An LED element comprising an n-type semiconductor layer and a p-type semiconductor layer, comprising:
an n-type electrode connected to the n-type semiconductor layer;
a p-type electrode connected to the p-type semiconductor layer; and
a structure disposed between the n-type electrode and the p-type electrode to separate the n-type electrode and the p-type electrode not overlapping each other,
wherein a side surface of the structure adjacent to the p-type electrode or the n-type electrode has an inverted taper shape, such that a top surface, furthest from the n-type semiconductor layer, has a wider cross-section than any lower cross-section of the structure, and
wherein the structure covers and directly contacts an edge of the n-type electrode and/or the p-type electrode.
2. The LED element of claim 1 , wherein:
an angle between the side surface of the structure and a top surface of the n-type electrode, directly below the side surface of the structure, has an acute angle; and
an angle between the side surface of the structure and a top surface of the p-type electrode, directly below the side surface of the structure, has an acute angle.
3. The LED element of claim 1 , wherein the p-type electrode, the n-type electrode, or at least one of each of the p-type electrode and the n-type electrode are on a same plane with the structure.
4. The LED element of claim 1 , wherein the structure is made of an insulating material.
5. A display device, comprising:
an LED element disposed on a substrate, the LED element comprising an n-type electrode and a p-type electrode;
a pixel electrode disposed on the substrate and connected to the p-type electrode;
a common electrode disposed on the substrate and connected to the n-type electrode; and
a structure disposed between the n-type electrode and the p-type electrode to separate the n-type electrode and the p-type electrode not overlapping each other,
wherein a side surface of the structure adjacent to the p-type electrode or the n-type electrode has an inverted taper shape, such that a top surface, furthest from the n-type semiconductor layer, has a wider cross-section than any lower cross-section of the structure, and
wherein the structure covers and directly contacts an edge of the n-type electrode and/or the p-type electrode.
6. The display device of claim 5 , wherein:
an angle between the side surface of the structure and a top surface of the n-type electrode, directly below the side surface of the structure, has an acute angle; and
an angle between the side surface of the structure and a top surface of the p-type electrode, directly below the side surface of the structure, has an acute angle.
7. The display device of claim 5 , wherein the structure is disposed such that it overlaps with the p-type electrode and/or the n-type electrode.
8. The display device of claim 5 , wherein:
the substrate comprises at least one driving element; and
the pixel electrode is connected to the driving element.
9. The display device of claim 5 , wherein a thickness of the structure is thicker than a thickness of the n-type electrode or the p-type electrode to have the inverted taper shape.
10. The display device of claim 5 , wherein the pixel electrode contacts to the side surface of the structure adjacent to the p-type electrode, or the common electrode contacts to the side surface of the structure adjacent to the n-type electrode.
11. The display device of claim 5 , wherein the pixel electrode and the common electrode are conductive material having a low step coverage enough to be disconnected by the inverted taper shape of the structure.