A method for generating an uniform luminosity for displaying contents on an organic light emitting diode display device that include a plurality of pictures and a plurality of pixels has a driver circuit in the display device to light the pictures and pixels. The method includes: (A) setting a unit time which is the time of the driver chip to scan every pixel; (B) calculating the multiple of the area of every picture; (C) obtaining the multiple of the maximum area; and (D) calculating the multiple of the area of every picture according to step (B).