1. A displaying method for use in an image display, wherein the image display comprises a plurality of pixels arranged in a matrix, each of the pixels comprises at least one subpixel of a primary color, the displaying method comprising: receiving a plurality of image data, wherein each of the image data controls a corresponding pixel to display a color which corresponds to an original gray scale of said primary color; generating a first gray scale and a second gray scale from each said original gray scale; dividing subpixels of the same primary color into a first subpixel group and a second subpixel group, wherein the first subpixel group and the second subpixel group are separated in a chessboard form; for each pixel having the subpixel belonging to the first group, utilizing the first gray scales of said pixel and the surrounding pixels to generate a first calibrated gray scale for said pixel; for each pixel having the subpixel belonging to the second group, utilizing the second gray scale of said pixel and the surrounding pixels to generate a second calibrated gray scale of said pixel; for each pixel, calculating a spatial frequency F based on the original grey scales of said pixel and the surrounding pixels; generating a distributed weight W according to a threshold T and the spatial frequency F; utilizing the first or the second calibrated gray scale and the original gray scale of the subpixel of said pixel to obtain an output gray scale of said pixel according to the distributed weight W; and utilizing a plurality of voltages corresponding to the output gray scales to drive the corresponding subpixels; wherein nine weights (A f , B f , C f , D f , E f , F f , G f , H f and I f ) corresponding to each pixel and the surrounding pixels are used to generate the spatial frequency F of said pixel according to the following relation: F =  [ g ⁢ ⁢ 1 g ⁢ ⁢ 2 g ⁢ ⁢ 3 g ⁢ ⁢ 4 g ⁢ ⁢ 5 g ⁢ ⁢ 6 g ⁢ ⁢ 7 g ⁢ ⁢ 8 g ⁢ ⁢ 9 ] * [ A f B f C f D f E f F f G f H f I f ]  where g5, g1, g2, g3, g4, g6, g7, g8, and g9 are the original gray scales of said pixel and the surrounding pixels, respectively.