An OLED display includes pixels, each including a first light emission region having a first area and a first perimeter and a second light emission region disposed neighboring the first light emission region and having a second area and a second perimeter. The first area, the first perimeter, the second area, and the second perimeter respectively satisfy an equation of A1*P2=A2*P1, where A1 is the first area, P1 is the first perimeter, A2 is the second area, and P2 is the second perimeter.