An inverter for boosting rotational image displaying gain has a driving module to output a plurality of driving signals of the same frequency and same phase to synchronously drive a plurality of voltage transformation modules. The driving signals have a duty cycle consisting high luminance cycles and low luminance cycles. The driving module has a time sequence control means to code the driving signals that drive the voltage transformation modules as the high luminance cycles corresponding to the image display time of a front end display panel. The transformation time difference between the preceding image and the following image of the display panel is coded as the low luminance cycles. Thereby the rotational image displaying gain of the display panel can be enhanced.