An energy-recycling (ER) technique for field color sequential LCD backlight driving

An energy-recycling (ER) technique has been proposed to implement high power conversion efficiency and low cost solution of field color sequential (FCS) LEDs backlight driving. One recycling capacitor C_R and one power-transistor M_R are added to synchronous boost converter to compose the ER function. When the output voltage of FCS-LEDs backlight driver switches from 40 V to 26 V for driving RGB LEDs during related time interval, ER technique stops to boost input voltage and switches to recycle energy from output terminal to the recycling capacitor C_R. Thus, the output voltage can be rapidly switched between two different voltage levels with minimum power losses. The proposed ER technique has been fabricated by TSMC 40 V BCD process. The experimental results demonstrate fast and efficient output voltage tracking performance is achieved by the proposed ER technique.