Apparatus for detecting candidate region for afterimage and appratus for preventing afterimage including the same

The residual image candidate region detection apparatus is provided. Residual image candidate region detection apparatus comprises n comparison unit, wherein the n-1 frame to the comparison unit for generating gray-scale data for the combined gray-scale data of the n-th frame as compared with the integrated gray-scale data of the n-1 frame of frame the providing integrated gray level data, comprising: a residual image candidate area detection unit for detecting a residual image candidate area from the combined gray-scale data of the memory and the n-th frame, for storing the integrated gray-scale data of the n-th frame, the integrated grayscale data includes the comparison area and the gray scale region.