Patent ID: 8247996
Filing Date: 2012-08-21
Classification: G09G,H05B,Y02B

Abstract:
1. A backlight driving system to drive a first backlight unit and a second backlight unit, comprising: a first inverter circuit to convert direct current (DC) signals into alternating current (AC) signals to drive the first backlight unit; a second inverter circuit to convert the DC signals into the AC signals to drive the second backlight unit; a pulse width modulation (PWM) controller to generate an illumination signal to control the first and second inverter circuits to illuminate the first and second backlight units in response to a first enable signal, and to generate a maintaining signal to control the first and second inverter circuits to maintain stable lighting of the first and second backlight units in response to a first feedback signal; a frequency regulator to control the PWM controller to generate the illumination signal and the maintaining signal in response to a second enable signal and a second feedback signal, respectively; and a switch circuit to connect the PWM controller to the second inverter circuit in response to the second enable signal; wherein the first and second feedback signals represent current flowing through the first and second backlight units, respectively.