POWER-OFF DISCHARGE CIRCUIT FOR LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide the power-off discharge circuit of a liquid crystal display device capable of charging the voltage of a gate line on which a gate-on voltage is impressed at the time of a power-on quickly. SOLUTION: This circuit includes a transistor T1 which has a gate, a source and a drain and in which the drain is connected to the gate-on terminal of a gate on/off voltage generator 2 and the source is grounded and which is turned on or turned off according to a gate voltage, a diode D1 to the anode of which a first voltage is applied and whose cathode is connected to the gate of the transistor T1 and a capacitor C1 to one terminal of which a second voltage is applied and whose other terminal is connected to the contact N1 between the cathode of the diode D1 and the gate of the transistor T1. The transistor T1 is turned on by the potential of the contact N1 in a power-on state and the transistor T1 is turned off by the potential of the contact N1 at the time of power-off state.