1. A circuit to drive signals in a display device, comprising: an image signal generator to generate a first frame signal and a second frame signal in successive time periods; a frame buffer register for storing the first frame signal; a first look-up table, electrically coupled to the frame buffer register, to generate a first over-drive voltage and a second over-drive voltage according to the first frame signal and the second frame signal, respectively; a comparator, electrically coupled to the first look-up table, to compare the first over-drive voltage with the second over-drive voltage to determine whether the first over-drive voltage and the second over-drive voltage are substantially the same; and a look-up data structure, electrically coupled to the comparator, to respectively determine a corrected first over-drive voltage corresponding to the first over-drive voltage and a corrected second over-drive voltage corresponding to the second over-drive voltage according to a result of the comparison by the comparator.