Patent ID: 8259056

Claim:
A method for dynamically controlling soft-start comprising: generating an enable signal according to a frequency signal, a backlight on ratio signal and a backlight on cycle signal; obtaining a plurality of count numbers of reference pulse signals, wherein a value of each count number is directly proportional to X multiplied by the backlight on ratio signal multiplied by the backlight on cycle signal, and then divided by 2 frequency signal , wherein X is a non-zero numerical value; setting a soft-start time according to the backlight on ratio signal and the backlight on cycle signal; outputting a first count number of the reference pulse signals in a first stage when the enable signal is at a trigger potential to initialize the soft-start time for generating a first driving signal having a first duty cycle; outputting a second count number of the reference pulse signals in a second stage after the first count number of the reference pulse signals are outputted for generating a second driving signal having a second duty cycle greater than the first duty cycle; and outputting a third count number of the reference pulse signals after the soft-start time for generating an output driving signal having a third duty cycle greater than the second duty cycle for controlling a backlight module.