An organic light emitting diode display, which can obtain a resonance effect by its metal mirror, and a manufacturing method thereof. The display includes a semiconductor layer, a dummy pattern layer, a gate insulating film, a pixel electrode, and a gate electrode. The semiconductor layer is formed of polysilicon on a base substrate. The dummy pattern layer is formed of polysilicon at a same layer level as the semiconductor layer and surrounds a light emitting region. The gate insulating film is on the base substrate while covering the semiconductor layer and the dummy pattern layer, and has recess portions corresponding to the light emitting region. The pixel electrode is filled in the recess portions, and is formed of a metal mirror multilayer including a transmissive conductive film and a reflective conductive film. The gate electrode is on the gate insulating film at a distance from the pixel electrode.