Patent ID: 7944440

Claim:
A liquid crystal display device comprising: a power supply unit which outputs a supply voltage at a first level when an outside power is supplied to the power supply unit and the power supply unit outputs the supply voltage at a second level when the outside power is removed from the power supply unit; a discharge unit which charges a charging voltage when the supply voltage at the first level is input to the discharge unit and outputs the charged charging voltage as a discharge signal when the supply voltage at the second level is input to the discharge unit; and a liquid crystal panel comprising: a gate discharge line; a plurality of gate lines connected to the gate discharge line; a plurality of thin film transistors connected to the plurality of gate lines; and a plurality of liquid crystal capacitors connected to the plurality of thin film transistors and which charges to a gradation display voltage, wherein the plurality of thin film transistors is turned on to discharge the gradation display voltage charged in the plurality of liquid crystal capacitors when the discharge signal is provided to the gate discharge line.