An organic light emitting diode (“OLED”) display includes a substrate, a gate line, a data line, a driving voltage line, a light blocking member, a switching thin film transistor (“TFT”), a driving TFT, and an OLED, wherein the driving voltage line includes a portion parallel to at least one of the gate line and the data line, the light blocking member is formed under at least one of the gate line, the data line, and the driving voltage line, the switching TFT is connected to the gate line and the data line and includes an amorphous semiconductor, the driving TFT is connected to the switching TFT and includes a polycrystalline semiconductor, and the OLED is connected to the driving TFT.