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 on said target image data 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 associated with the target pixel in response to differences between said target image data associated with the target pixel and pixels physically adjacent to said target pixel in the display panel, wherein said correction data include: first and second correction point data which specify positions of first and second control points specifying the shape of said gamma curve, and wherein said correction circuit modifies said first and second correction point data so that a difference between coordinates of said first and second control points on a coordinate axis corresponding to said gamma-corrected data in a coordinate system in which said gamma curve is defined is increased as the differences of between said target image data associated with the target pixel and pixels physically adjacent to said target pixel is increased.