Abstract: The present invention discloses an LED driving device with pulse width modulation (PWM) capable of preventing the LED display from flickering. The LED driving device primarily comprises a PWM unit for modulating the ON/OFF signal with a PWM cycle from one signal of higher resolution to two or more signals of lower resolution. The modulation is executed with the proviso that the duty cycle of the PWM cycle is almost or completely preserved. Accordingly, the LED will be lit more frequently and perform preset brightness with a higher refresh rate.