The present invention provides an image optimization method for performing data update on pixel units in the pixel matrix of the liquid crystal displays. The pixel matrix includes at least a first row and a second row, wherein the first row and the second row respectively include a plurality of pixel units. In one frame period, the image optimization method performs data update respectively on pixel units of the first row and the second row according to a first sequence. In another frame period, the image optimization method performs data update respectively on pixel units of the first row and the second row according to a second sequence.