Samsung patents stacked LED design with stepped widths for displays

1. A light-emitting device comprising: an epitaxial structure comprising a first light-emitting structure, a second light-emitting structure, and third light-emitting structure which are sequentially stacked in a vertical direction and configured to emit light of different wavelengths, a width of the first light-emitting structure being less than a width of the second light-emitting structure, the width of the second light-emitting structure being less than a width of third light-emitting structure in a horizontal direction orthogonal to the vertical direction, each of the first light-emitting structure, the second light-emitting structure, and the third light-emitting structure comprising a p-type semiconductor layer, an active layer, and an n-type semiconductor layer which are sequentially stacked; a first p-electrode contacting the p-type semiconductor layer of the first light-emitting structure; a second p-electrode contacting the p-type semiconductor layer of the second light-emitting structure; a third p-electrode contacting the p-type semiconductor layer of the third light-emitting structure, at least one of the first p-electrode, the second p-electrode, and the third p-electrode having a conductive via structure; an n-common electrode comprising an n-common portion under the epitaxial structure, and n-electrode portions extending from the n-common portion and contacting a side surface of the n-type semiconductor layer of each of the first light-emitting structure, the second light-emitting structure, and the third light-emitting structure, at least two of the n-electrode portions being on a side portion of the epitaxial structure and spaced apart from each other in the horizontal direction; and a separation layer between the n-common electrode and side surfaces of the p-type semiconductor layer and the active layer of each of the first light-emitting structure, the second light-emitting structure, and the third light-emitting structure.