The present invention discloses a method for reducing ripple noise on the image of a display. The steps of the method include: (a) providing a first potential signal to a backlight module by an inverter; (b) resetting the inverter; (c) providing a second potential signal to the backlight by the inverter, wherein the phase difference between the first potential signal and the second potential signal is 180 degrees; (d) resetting again the inverter; and (e) repeating the steps (a) to (d) Consequently, the ripple noise present on the display would be effectively reduced by the alteration of the bright areas and dark areas on the display panel in conjunction with the persistence of vision of the user's eyes.