Light emitting device for display and led display apparatus having the same

A light emitting device, comprising:

• a first light emitting stack, a second light emitting stack, and a third light emitting stack, each including a first conductivity type semiconductor layer, a second conductivity type semiconductor layer, and an active layer disposed between the first and second conductivity type semiconductor layers;
• a first lower contact electrode in ohmic contact with the first light emitting stack;
• a second lower contact electrode in ohmic contact with the second conductivity type semiconductor layer of the second light emitting stack;
• a third lower contact electrode in ohmic contact with the second conductivity type semiconductor layer of the third light emitting stack;
• a first connection electrode electrically connected to the first light emitting stack;
• a second connection electrode electrically connected to the second light emitting stack;
• a third connection electrode electrically connected to the third light emitting stack;
• and
• a fourth connection electrode commonly electrically connected to the first, second, and is third light emitting stacks,
• wherein:
• the second light emitting stack is disposed between the first light emitting stack and the third light emitting stack;
• the first lower contact electrode is disposed between the first light emitting stack and the second light emitting stack;
• the second lower contact electrode and the third lower contact electrode are disposed between the second light emitting stack and the third light emitting stack;
• the first lower contact electrode, the second lower contact electrode, and the third lower contact electrode include transparent conductive oxide layers;
• a thickness of the second lower contact electrode or the third lower contact electrode is greater than a thickness of the first lower contact electrode;
• and
• the fourth connection electrode is electrically connected to the first conductivity type semiconductor layers of the first, second, and third light emitting stacks in common.