A display device includes a display panel including a plurality of pixels, a color compensator calculating a mixed color coordinate of a mixed light of an image light and an external light based on a first color coordinate of the image light, a second color coordinate of the external light, and a luminance ratio of a second luminance value of the external light to a first luminance value of the image light and compensating the first color coordinate based on the mixed color coordinate to generate an output image data, and a panel driver providing a driving signal to the display panel to display an image corresponding to the output image data.