Patent ID: 8993993
Filing Date: 2015-03-31
Classification: H01L

Abstract:
1. A semiconductor light emitting device comprising: a light emitting structure comprising a first-conductivity-type semiconductor layer, an active layer, and a second-conductivity-type semiconductor layer; and a pattern disposed on at least one light emitting surface among the surfaces of the light emitting structure, the pattern having a plurality of convex or concave parts that are similar in shape, wherein: the light emitting surface with the pattern thereon has a plurality of regions defined such that the regions are equal in size and are arranged linearly in a first direction and a second direction perpendicular to the first direction, and each of the regions has a substantially circular shape and is in contact with at least two regions adjacent thereto, each of the convex or concave parts is disposed in a corresponding one of the plurality of regions such that a part of the edge of each convex or concave part is in contact with the outline of the corresponding region, and first and second convex or concave parts arranged in the first direction, among the plurality of convex or concave parts, are sequentially disposed in first and second regions, among the plurality of regions, corresponding to the first and second convex or concave parts such that the edge part of the first convex or concave part in contact with the outline of the first region has a rotational position with respect to the center of the first region, clockwise or counterclockwise from a rotational position of the edge part of the second convex or concave part in contact with the outline of the second region with respect to the center of the second region, and third and fourth convex or concave parts arranged in the second direction, among the plurality of convex or concave parts, are sequentially disposed in third and fourth regions, among the plurality of regions, corresponding to the third and fourth convex or concave parts such that the edge parts of the third and fourth convex or concave parts in contact with the outlines of the third and fourth regions have an identical rotational position with respect to the respective centers of the third and fourth regions.