Patent ID: 8754578

Claim:
An illumination apparatus, comprising: a substrate; K number of first LED cells arranged in a row on a top surface of the substrate, where K is an integer satisfying K≧3; K number of second LED cells arranged in a row parallel to the row of the first LED cells on the top surface of the substrate; (K−1) number of third LED cells arranged in a row between the respective rows of the first and second LED cells on the top surface of the substrate, a first external electrode connected with a first electrode of a first one of the first LED cells and a second electrode of a first one of the second LED cells; and a second external electrode connected with electrodes among electrodes of the K th first and second LED cells, which are not in connection with the third LED cell; and first and second current loops each driven in each a half cycle of an alternating voltage applied between the first and second external electrodes, wherein: the first current loop has (2r−1) sequence of the first LED cells, 2r sequence of the second LED cells and the (K−1) number of third LED cells, respectively to be connected in series; and the second current loop has 2r sequence of the first LED cells, (2r−1) sequence of the second LED cells and the (K−1) number of third LED cells, respectively to be connected in series, where r is a positive integer defining sequences of the respective first to third LED cells with respect to the first external electrode, the first to third LED cells each comprise a first conductivity type semiconductor layer, an active layer and a second conductivity type semiconductor layer which are sequentially grown on the substrate, and at least one adjacent pair of the first LED cells is isolated from each other by an exposed region of the first conductivity type semiconductor layer, and at least one adjacent pair of the first LED cells is isolated from each other by exposed regions of the substrate.