The invention relates to display device. The display device comprises a display panel with a plurality of display units, a data driving circuit and a common voltage circuit, wherein the display units comprise pixel electrodes and common electrodes; the data driving circuit is used for supplying display gray scale voltage corresponding to display data to the display units; the pixel electrodes are matched with the common electrodes to display the display data; the display panel further comprises a switch circuit for connecting the multiple display units to the data driving circuit; the switch circuit transmits the display gray scale voltage from the data driving circuit to the pixel electrodes in the displaying period and feeds gray scale voltage of the pixel electrodes back to the data driving circuit in the feedback period; the data driving circuit correspondingly outputs a feedback signal to the common voltage circuit according to the fed back gray scale voltage and adjusts common voltage.