Patent ID: 8604720

Claim:
A light emitting diode driving method adapted for driving a plurality of light emitting diode strings, each of the light emitting diode strings comprising at least one light emitting diode, the light emitting diode driving method comprising steps of: obtaining an initial value of a duty-on period of a driving current in a frequency period to thereby acquire a target accumulative luminosity in the initial value of the duty-on period for each of the light emitting diode strings, wherein the duty-on period is an on-duty time of the driving current in the frequency period; judging the maximum one of the initial values of the duty on periods of driving currents in the frequency period for the light emitting diode strings whether is shorter than the frequency period; and prolonging the duty-on period of the driving current in the frequency period and assuring an accumulative luminosity in the prolonged duty-on period to be substantially equal to the target accumulative luminosity in the initial duty-on period for each of the light emitting diode strings, when the maximum one of the initial values of the duty-on periods of the driving currents in the frequency period for the light emitting diode strings is judged to be shorter than the frequency period.