Disclosed is a display device for configure to decrease power consumption. The device comprises a display panel having a plurality of data lines and gate lines crossing in a matrix form, wherein a pixel is defined at each crossing thereof; a data driver connected to the plurality of data and supplying analog data voltages converted from digital data voltages to odd data lines and even data lines respectively according to an odd gamma reference voltage and an even gamma reference voltage; a gamma generator outputting one of a positive gamma reference voltage and a negative gamma reference voltage as the odd gamma reference voltage, and one of the positive gamma reference voltage and the negative gamma reference voltage as the even gamma reference voltage to the data driver; and a timing controller generating a control signal for driving the display panel.