A light emitting device, comprising: a plurality of light emitting elements arranged in a two-dimensional array and formed on a common second electrode layer which is not separated for each light emitting element, each light emitting element including a first conductivity type layer, an active layer and a second conductivity type layer, wherein the active layer is formed between the first conductivity type layer and the second conductivity type layer; a plurality of trenches extending through the first conductivity type layer, the active layer and the second conductivity type layer, thereby spearating adjacent light emitting elements of the plurality of light emitting elements; a first insulating layer formed in the trenches between adjacent light emitting elements, wherein a top surface of the first insulating layer is extended onto a top surface of each light emitting element; a second insulating layer on outer peripheral portions of the first conductivity type layer, the active layer, and the second conductivity type layer wherein a top surface of the second insulating layer is extended onto a top edge surface of each light emitting element, first electrodes, each formed as a grid and respectively disposed on a respective one of the plurality of light emitting elements; and a pad electrode electrically connected to the first electrodes, wherein the pad electrode is disposed on the first insulating layer, wherein the pad electrode comprises a central portion which is disposed on the top surface of the first insulating layer such that it covers the trenches, wherein a width of the central portion is less than a width of the first insulating layer wherein the pad electrode further comprises a plurality of branch portions extending from the central portion to the first electrodes and wherein a portion of the branch portions of the pad electrode is vertically overlapped with the first electrodes, and wherein the plurality of branch portions of the pad electrode contacts each of the grids formed by the first electrodes. a plurality of light emitting elements arranged in a two-dimensional array and formed on a common second electrode layer which is not separated for each light emitting element, each light emitting element including a first conductivity type layer, an active layer and a second conductivity type layer, wherein the active layer is formed between the first conductivity type layer and the second conductivity type layer; a plurality of trenches extending through the first conductivity type layer, the active layer and the second conductivity type layer, thereby spearating adjacent light emitting elements of the plurality of light emitting elements; a first insulating layer formed in the trenches between adjacent light emitting elements, wherein a top surface of the first insulating layer is extended onto a top surface of each light emitting element; a second insulating layer on outer peripheral portions of the first conductivity type layer, the active layer, and the second conductivity type layer wherein a top surface of the second insulating layer is extended onto a top edge surface of each light emitting element, first electrodes, each formed as a grid and respectively disposed on a respective one of the plurality of light emitting elements; and a pad electrode electrically connected to the first electrodes, wherein the pad electrode is disposed on the first insulating layer, wherein the pad electrode comprises a central portion which is disposed on the top surface of the first insulating layer such that it covers the trenches, wherein a width of the central portion is less than a width of the first insulating layer wherein the pad electrode further comprises a plurality of branch portions extending from the central portion to the first electrodes and wherein a portion of the branch portions of the pad electrode is vertically overlapped with the first electrodes, and wherein the plurality of branch portions of the pad electrode contacts each of the grids formed by the first electrodes. a first insulating layer formed in the trenches between adjacent light emitting elements, wherein a top surface of the first insulating layer is extended onto a top surface of each light emitting element; a second insulating layer on outer peripheral portions of the first conductivity type layer, the active layer, and the second conductivity type layer wherein a top surface of the second insulating layer is extended onto a top edge surface of each light emitting element, first electrodes, each formed as a grid and respectively disposed on a respective one of the plurality of light emitting elements; and a pad electrode electrically connected to the first electrodes, wherein the pad electrode is disposed on the first insulating layer, wherein the pad electrode comprises a central portion which is disposed on the top surface of the first insulating layer such that it covers the trenches, wherein a width of the central portion is less than a width of the first insulating layer wherein the pad electrode further comprises a plurality of branch portions extending from the central portion to the first electrodes and wherein a portion of the branch portions of the pad electrode is vertically overlapped with the first electrodes, and wherein the plurality of branch portions of the pad electrode contacts each of the grids formed by the first electrodes.