1. An image display method; comprising sampling an image to be displayed row by row and column by column in a predefined order by using a rectangular sampling area with a size matching at least one preset characteristic pattern, wherein after obtaining an image within a sampling area, the method farther comprises; comparing the image within the sampling area with each of the at least one preset characteristic pattern, respectively; in a case where the image within the sampling area matches any of the at least one preset characteristic pattern, obtaining a gray scale value for at least one monochromatic sub-pixel among multiple monochromatic sub-pixels corresponding to the sampling area in a value assignment manner corresponding to the preset characteristic pattern, and marking the at least one monochromatic sub-pixel in a state marking matrix as gray scale value being determined and unchangeable; and in a case where the image within the sampling area does not match any of the at least one present characteristic pattern, calculating gray scale values for multiple monochromatic sub-pixels corresponding to the sampling area according to the markings of the multiple monochromatic sub-pixels in the state marking matrix and the image within the sampling area, and marking the monochromatic sub-pixels in the state marking matrix as gray scale value toeing determined and changeable or being processed but gray scale value to be determined; wherein all the markings in the state marking matrix correspond to ail the monochromatic sub-pixels for displaying the image in a one to one manner, and in an initial state, all the markings in the state marking matrix, which correspond to all the monochromatic sub-pixels, are unprocessed.