Patent ID: 8279159

Claim:
A control method of a liquid crystal backlight device, said control method comprising the steps of: obtaining a stable display time from the intrinsic delay characteristic of the liquid crystal; transmitting the obtained stable display time to a signal processing unit for modulation of a backlight illumination signal; modulating the backlight illumination signal, including adjusting a backlight illumination frequency, a backlight illumination intensity and a pulse width of the backlight illumination signal, by performing delay control using a plurality of backlight activation times of the liquid crystal, wherein the backlight illumination signal has two different amplitudes in a frame time; performing delay control of the backlight activation times until the liquid crystal reaches a steady state; generating a modulated backlight activation signal by a modulation signal regarding the pulse width of the backlight illumination signal, the backlight illumination frequency, or the backlight illumination intensity according to information of a duty cycle of a backlight activation signal of a backlight module; and controlling a backlight activation timing; wherein the backlight activation timing of the backlight module is controlled to change its backlight illumination pattern including the backlight illumination frequency, the backlight illumination intensity and the pulse width of the backlight illumination signal by adjusting the duty cycle of the backlight activation signal in order to achieve stable backlight illumination.