Provided is an organic light-emitting display device including: a first pixel; a second pixel; and a common capacitor connected to the first and second pixels, wherein the first pixel comprises: a first switching transistor transmitting a first data signal in response to a first scan signal; a second switching transistor transmitting the first data signal to the common capacitor; a first storage capacitor storing a charge corresponding to the first data signal; a first driving transistor generating a driving current corresponding to the charge stored in the first storage capacitor; and a first organic light-emitting diode (OLED) emitting light corresponding to the first driving current, and wherein the second pixel comprises: a third switching transistor transmitting a second data signal in response to a second scan signal; a fourth switching transistor transmitting the second data signal to the common capacitor; a second storage capacitor storing a charge corresponding to the second data signal; a second driving transistor generating a driving current corresponding to the charge stored in the second storage capacitor; and a second organic light-emitting diode (OLED) emitting light corresponding to the second driving current.