Backlight control circuit and method thereof

A backlight control circuit and a method thereof are provided to control the backlight of a backlight module so as to upgrade the dynamic contrast ratio and save more power. The backlight control circuit includes an average luminance detection circuit, a luminance distribution detection unit, a pulse width control circuit and a pulse width modulator. The average luminance detection circuit detects the average luminance of a to-be-displayed frame which includes a plurality of pixels; the luminance distribution detection unit detects the pixel luminance distribution of the frame; the pulse width control circuit generates a pulse width control signal according to the average luminance and the pixel luminance distribution of the frame; the pulse width modulator generates a pulse width modulation (PWM) signal according to the pulse width control signal, so as to control the backlight of the backlight module.