A display device includes a signal storing portion storing first, second, third, and fourth input data signals, an average signal generating portion averaging the first, second, third, and fourth input data signals, respectively, that are adjacent to each other along a row and a column and generating first, second, third, and fourth output data signals, and a display portion having a plurality of pixels, each of the pixels having first, second, third, and fourth sub-pixels for receiving the first, second, third, and fourth output data signals, respectively, and each of the pixels sharing the sub-pixels with an adjacent one of the pixels.