1. A display device, comprising: a display panel; a correction circuit performing gamma correction on target image data in response to correction data specifying a shape of a gamma curve; and a driver circuit driving said display panel in response to gamma-corrected data received from said correction circuit, wherein said correction circuit is configured to performs approximate gamma correction in accordance with a correction expression in which said target image data are defined as a variable of said correction expression and coefficients of said correction expression are determined on said correction data, and to modify said correction data in response to said target image data associated with a target pixel of said gamma correction and pixels adjacent to said target pixel.