A display device, comprising: a substrate having a plurality of metal pads (1070,1071,1072,1073, 3070,3071,3072,3073); and green semiconductor light emitting elements (1052,3052) and blue semiconductor light emitting elements (1053,3053) electrically connected to the metal pads through self-assembly wherein the green semiconductor light emitting elements and the blue semiconductor light emitting elements have identification portions (1080,3080) having different shapes to be distinguished while being coupled to the substrate, wherein the green semiconductor light emitting elements and the blue semiconductor light emitting elements respectively comprises: a conductive semiconductor layer; a conductive electrode formed on one surface of the conductive semiconductor layer; and a passivation layer configured to surround the semiconductor light emitting element, and provided with a through hole through which the conductive electrode is exposed, and wherein the identification portion is the passivation layer a through hole formed in the passivation layer of the green semiconductor light emitting element and a through hole formed in the passivation layer of the blue semiconductor light emitting element having different shapes or sizes, and wherein the metal pads are formed in shapes corresponding to the respective through holes. a substrate having a plurality of metal pads (1070,1071,1072,1073, 3070,3071,3072,3073); and green semiconductor light emitting elements (1052,3052) and blue semiconductor light emitting elements (1053,3053) electrically connected to the metal pads through self-assembly wherein the green semiconductor light emitting elements and the blue semiconductor light emitting elements have identification portions (1080,3080) having different shapes to be distinguished while being coupled to the substrate, wherein the green semiconductor light emitting elements and the blue semiconductor light emitting elements respectively comprises: a conductive semiconductor layer; a conductive electrode formed on one surface of the conductive semiconductor layer; and a passivation layer configured to surround the semiconductor light emitting element, and provided with a through hole through which the conductive electrode is exposed, and wherein the identification portion is the passivation layer a through hole formed in the passivation layer of the green semiconductor light emitting element and a through hole formed in the passivation layer of the blue semiconductor light emitting element having different shapes or sizes, and wherein the metal pads are formed in shapes corresponding to the respective through holes. a conductive semiconductor layer; a conductive electrode formed on one surface of the conductive semiconductor layer; and a passivation layer configured to surround the semiconductor light emitting element, and provided with a through hole through which the conductive electrode is exposed, and wherein the identification portion is the passivation layer a through hole formed in the passivation layer of the green semiconductor light emitting element and a through hole formed in the passivation layer of the blue semiconductor light emitting element having different shapes or sizes, and wherein the metal pads are formed in shapes corresponding to the respective through holes.