Embodiments of the present invention provide a method for driving a pixel array. The pixel array comprises a plurality of pixel units, each comprising a plurality of sub-pixels of different colors, each sub-pixel having an aspect ratio from 1:2 to 1:1. The method comprises steps of: dividing an image to be displayed on the pixel array into a plurality of theoretical pixel units, each theoretical pixel unit comprising a plurality of color components; and calculating a luminance value of each sub-pixel of each pixel-unit based on the color components of respective divided theoretical pixel units.