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 comprises: 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 staggered 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 scales of said pixel and the surrounding pixels to generate a second calibrated gray scale of said pixel; and utilizing a plurality of first voltages corresponding to the first calibrated gray scales to drive the corresponding subpixels of the first subpixel group, and a plurality of second voltages corresponding to the second calibrated gray scales to drive the corresponding subpixels of the second subpixel group.