An organic light emitting display and a driving method thereof capable of improving outdoor visibility by controlling the emission of the pixel. In one embodiment, the organic light emitting display includes an organic light emitting display panel; an emission control driver of the organic light emitting display panel; a sensor unit for outputting an electrical output signal by sensing an external light; a signal processing unit for determining an indoor mode or an outdoor mode in accordance with the output signal outputted from the sensor unit; an onscreen display control unit electrically connected to the signal processing unit and for controlling the emission control driver of the organic light emitting display panel; and an onscreen display area comprising a pixel circuit electrically connected to the emission control driver. Here, the pixel circuit of the onscreen display area is controlled by the emission control driver.