Light emitting device having a plurality of light emitting cells

A light-emitting device, comprising:

• a substrate;
• light-emitting units disposed on the substrate, each of the light-emitting units comprising:
• a first conductivity-type semiconductor layer, a second conductivity-type semiconductor layer, and an active layer disposed between the first conductivity-type semiconductor layer and the second conductivity-type semiconductor layer;
• a first electrode connected to the first conductivity-type semiconductor layer;
• and
• a second electrode connected to the second conductivity-type semiconductor layer;
• a first electrode pad and a second electrode pad disposed on first and second light-emitting units of the light-emitting units, respectively,
• wherein third and fourth light-emitting units of the light-emitting units share the first conductivity-type semiconductor layer, and
• wherein a first or second electrode disposed on the shared first conductivity-type semiconductor layer connects the first and second light-emitting units.