Device and method used for adjusting handset illumination brightness

The invention relates to the electronic communication technology field and particularly relates to a device and a method used for adjusting handset illumination brightness. Through adjusting a wave duty ratio, an average current of an electric torch can be adjusted through the wave duty ratio; when brightness of the electric torch is adjusted, wave signal frequency is unchanged, the time of a high level of wave pulses is changed, namely the conduction time of the electric torch is changed. The signal adjustment brightness is relatively equivalent to adjusting an average current of the torch, the current changes, so the power of the torch can be changed according to change of the wave duty ratio. According to the device and the method used for adjusting handset illumination brightness, brightness adjustment is realized through adjusting PWM waves, a user is enabled to select a relatively low power consumption mode according to actual situations and electric quantity of a handset, so not only can illumination d