An organic light emitting display includes a scan driver, a data driver, a current sink unit, and pixels. The scan driver is configured to provide a first scan signal to first scan lines and a second scan signal to second scan lines. The data driver is configured to provide a data signal to first data lines and a voltage data signal to second data lines. The current sink unit is configured to provide a current data signal to third data lines. The pixels are configured to store a voltage corresponding to the voltage data signal and the current data signal. A light emission time of the pixels is controlled by the data signal.