A display device includes a plurality of pixels including a first capacitor connected between a data line and a first node, a switching transistor connecting the first node and a second node, a first light emitting transistor transmitting a first power source voltage to the second node, a driving transistor having one electrode connected to the second node and controlling a driving current flowing to an organic light emitting diode (OLED), and a reference voltage transistor transmitting a reference voltage to the first node, wherein, when the first power source voltage is applied to the second node through the first light emitting transistor such that a light emitting step in which the OLED emits light is simultaneously performed in a plurality of pixels.