Patent ID: 8823022

Claim:
A light emitting device, comprises: a substrate; and a serially-connected LED array epitaxially formed on the substrate, comprising a first LED cell, a second LED cell, and a serially-connected LED sub-array comprising at least three LED cells intervening the first and the second LED cells; wherein each LED cell of the serially-connected LED array comprises: a first semiconductor layer formed on the substrate; a second semiconductor layer formed on the first semiconductor layer; and an active layer formed between the first semiconductor layer and the second semiconductor layer; wherein the first LED cell and the second LED cell are adjacent to each other, and the distance between the first semiconductor layer of the first LED cell and the first semiconductor layer of the second LED cell is larger than 30 μm, wherein one of the first semiconductor layers and/or one of the second semiconductor layers of the LED cells comprises at least a round corner with a radius of the curvature not less than 15 μm.