The present disclosure provides an OLED array substrate including a plurality of pixel units each including a plurality of sub pixel units, each of the sub pixel units including a light emitting portion, each light emitting portion being a first remote from the light exiting side. An organic film layer having an electrode, a second electrode close to the light exit side, and an organic light emitting layer interposed between the first electrode and the second electrode, wherein the subpixel unit is continuously disposed on the light exit side of the second electrode; Further comprising a semi-reflective mirror layer, wherein the first electrode comprises a reflective layer, the second electrode is a transparent electrode, and the structure between the first electrode and the semi-reflective mirror layer constitutes a microcavity structure, each of The organic film layers of the sub pixel units of different colors of the pixel unit have different thicknesses. The present disclosure further provides methods of manufacturing OLED display panels, OLED display devices and array substrates.
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