Patent ID: 8912729

Claim:
A backlight module comprising a power end for supplying a power supply voltage, characterized in that the backlight module further comprising: a converter electrically connected to the power end, comprising a switch signal generator for generating a switch signal, the converter for converting the power supply voltage to a positive voltage level of a driving signal in response to a first voltage level of the switch signal, and for converting the power supply voltage to a negative voltage level of the driving signal in response to a second voltage level of the switch signal, the positive and negative voltage levels being generated alternately, the converter comprising: a capacitor element coupled to the lighting device in parallel; a first switch electrically coupled to the power end, turning on when the switch signal is at the first voltage level; a second switch electrically coupled to the power end, turning on when the switch signal is at the first voltage level; a first inductor element electrically coupled to the first switch; a second inductor element electrically coupled to the power end, the second switch, and the capacitor element; a third switch electrically coupled to the second inductor element and the power end, turning on when the switch signal is at the second voltage level; a first diode comprising a first positive end directly coupled to the first inductor element and the second switch, and a first negative end directly coupled to the capacitor element; and a second diode comprising a second positive end directly coupled to the capacitor element and the first negative end of the first diode, and a second negative end directly coupled to the second inductor element and the third switch; and a lighting device electrically connected to the converter, for generating light based on the positive and negative voltage levels of the driving voltage from the converter.