A display device for sequentially displaying a plurality of subframes (images) within one frame period according to an image source signal, the device including: a pixel array including a plurality of pixels; a scale factor generator configured to separately calculate electric current values of the electric to be consumed by each of the plurality of respective subframes (per frame period), and to calculate an initial scale factor by comparing the electric current value with a threshold electric current value, and to generate a correction scale factor (for each among the plurality of subframes) of the first frame by using the initial scale factor and a correction scale factor of a previous frame (previous to the first frame) (and of the same subframe index) corresponding to the initial scale factor; and an image processor configured to convert a gray data of the image source signal of the first frame.