The display device comprises a display unit, a source electrode driver, a grid electrode driver, and a compensating unit. The display unit comprises at least one pixel unit, and each pixel unit comprises a first transistor, a second transistor, a first capacitor, a second capacitor, and an organic light emitting diode. When each pixel unit operates in a mode of display, the organic light emitting diode is started, and the pixel unit outputs a sensing voltage. The sensing unit comprises a first parameter of the characteristic of the second transistor and a second parameter of the characteristic of the organic light emitting diode. The compensating unit is used for receiving the sensing voltage, and outputting compensating data according to the sensing voltage. The source electrode driver and the pixel units are electrically coupled to each other, and is used for receiving the compensating data so as to adjust and output the next piece of display data.