A circuit for driving a liquid crystal display device includes a liquid crystal panel including a plurality of gate lines and data lines, a gate driver, a data driver, a memory for storing data necessary for operation of a timing controller and programmable power integrated circuit (PPIC) voltage setting data, the timing controller for reading and outputting the PPIC voltage setting data stored in the memory and reading the data necessary for operation of the timing controller stored in the memory and controlling the data driver and the gate driver, a PPIC for supplying a reference voltage, a gamma voltage and a common voltage to the data driver according to the voltage setting data supplied by the timing controller, and a power supply for receiving power from an external device and supplying power to each unit.