An OLED display is disclosed, which includes a substrate and a first and a second light emitting unit arranged on the substrate. A first, a second, a third and a fourth region are defined on the substrate, wherein the sub-pixels in the first and fourth regions and the sub-pixels in the second and third regions are symmetrical with each other. Alternatively, the sub-pixels in the first region and the sub-pixels in the third region are point symmetric to a center of the first light emitting unit, so as to improve displaying resolution of the OLED display.