Patent ID: 8363043

Claim:
A driving circuit for generating a liquid crystal driving voltage, the driving circuit having a liquid crystal driving voltage terminal and a reference voltage terminal, the driving circuit comprising: a power input terminal; a DC-DC converter having an input terminal coupled to the power input terminal, the DC-DC converter further having an output terminal, the DC-DC converter converting an input voltage level provided at the power input terminal to the liquid crystal driving voltage and outputting the liquid crystal driving voltage through the output terminal to the liquid crystal driving voltage terminal; a first diode having an anode terminal coupled to the input terminal of the DC-DC converter and the power input terminal, the first diode further having a cathode terminal coupled to the reference voltage terminal; a second diode having an anode terminal coupled to the liquid crystal driving voltage terminal, the second diode further having a cathode terminal directly coupled to the cathode terminal of the first diode; and a zener diode, wherein the input terminal of the DC-DC converter is connected through the first diode to the zener diode, and the output terminal of the DC-DC converter is electrically connected through the second diode to the zener diode.