An organic electroluminescent display device includes a gate line receiving a gate signal, a data line crossing the gate line, the data line receiving a data signal, a first transistor switching the data signal according to the gate signal, the first transistor being turned on during a single horizontal scan time period having first and second sub-periods, a second transistor switching a source voltage according to the data signal and connected to the first transistor, a storage capacitor connected to a first node between the first and second transistors and connected to the source voltage, a third transistor switching a first voltage signal and connected to the second transistor, the first voltage signal having different voltage levels during the first and second sub-periods of the scan time period, and an organic electroluminescent diode connected to a second node between the second and third transistors and connected to a ground voltage.