Ac driven light emitting device

An alternating current (AC) driven light emitting device 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 Kth first and second LED cells, which are not in connection with the third LED cell
• wherein the AC driven light emitting device has 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.