An OLED array substrate, comprising a plurality of pixel units, the pixel unit at least comprising a first sub-pixel, a second sub-pixel and a third sub-pixel, further comprising: a substrate, a TFT array and a pixel electrode formed on the substrate, and at least two organic luminescent material layers that display different colors formed on the pixel electrode, wherein the first sub-pixel comprises a first pixel electrode, the second sub-pixel comprises a second pixel electrode, the third sub-pixel comprises a third pixel electrode, an organic luminescent material layer of a first color covers the adjacent first pixel electrode and second pixel electrode in the pixel unit, an organic luminescent material layer of a second color covers the adjacent second pixel electrode and third pixel electrode in the pixel unit.