Patent ID: 7723736

Claim:
A light emitting device, comprising: a plurality of light emitting cells arranged on a substrate, each of the light emitting cells comprising: a buffer layer arranged directly on the substrate; an N-type semiconductor layer arranged on the buffer layer; an active layer arranged on a portion of the N-type semiconductor layer; and a P-type semiconductor layer arranged on the active layer; an N-type metal bumper arranged on the N-type semiconductor layer of a first light emitting cell among the plurality of light emitting cells; a P-type metal bumper arranged on the P-type semiconductor layer of a second light emitting cell among the plurality of light emitting cells; and a plurality of connection electrodes for electrically connecting the N-type semiconductor layers and the P-type semiconductor layers of adjacent light emitting cells to form a serial light emitting cell array on the substrate, and the first light emitting cell and the second light emitting cell are respectively arranged at a first end and a second end of the serial light emitting cell array, wherein the top surface of the N-type metal bumper and the top surface of the P-type metal bumper are higher above the substrate than top surfaces of the connection electrodes.