Patent ID: 7589479

Claim:
A backlight driving apparatus of a liquid crystal display, comprising: a light source that emits light; an AC driver for supplying AC power of a high voltage so that the light source emits light; and a protection circuit electrically connected to the AC driver, for determining whether an input voltage applied to the AC driver is lower than a predetermined voltage and stopping the driving of the AC driver, wherein the protection circuit comprises: a reference voltage setting unit for setting a reference voltage of a predetermined level; one or more resistors for dividing the input voltage applied to the AC driver in order to form a comparison voltage; and a comparator having two input terminals connected to an output terminal of the reference voltage setting unit and the one or more resistors, respectively, wherein the comparator compares the reference voltage and the comparison voltage received via the one or more resistors and outputs a control voltage for the driving of the AC driver.