An organic light emitting diode (OLED) display includes a substrate main body, a thin film transistor formed on the substrate main body, and an OLED formed on the substrate main body. The thin film transistor includes a gate electrode, an oxide semiconductor layer disposed on the gate electrode in an insulated manner, and source and drain electrodes respectively contacting the oxide semiconductor layer. Parts of the source and drain electrodes contacting the oxide semiconductor layer are separated from the gate electrode in a direction that is parallel with the substrate main body by a predetermined distance.