1. A method for controlling image display, comprising: reading gray scales of all sub-pixels of a current frame image displayed by a display device; determining an ideal luminance corresponding to the gray scale according to a predetermined ideal corresponding relationship between the gray scales and the luminance of respective sub-pixels, respectively; determining an adjusted gray scale corresponding to the ideal luminance according to a predetermined original corresponding relationship between the gray scales and the luminance of respective sub-pixels, respectively; driving the display device to display the current frame image according to the adjusted gray scale.