A display device includes a comparing portion extracting a minimum value and a maximum value of red, green, blue source image data signals, a first extracting portion extracting an intermediate signal from the minimum value and extracting a white image data signal from the intermediate signal, a second extracting portion extracting a red image data signal from the intermediate signal, the maximum data signal, and the red source image data signal, a third extracting portion extracting a green image data signal from the intermediate signal, the maximum data signal, and the green source image data signal, a fourth extracting portion extracting a blue image data signal from the intermediate signal, the maximum data signal, and the blue source image data signal, and a display panel having a plurality of pixels including red, green, blue, and white sub-pixels supplied with the red, green, blue, and white image data signals, respectively.