Patent ID: 8654107

Claim:
A shading signal generating circuit, applied to a liquid crystal display panel, and comprising: an output port; a first switch, electrically connected to the output port and a first voltage source, and receiving a clock signal, wherein when the clock signal switches on the first switch, the output port is electrically connected to the first voltage source; a second switch, electrically connected to the output port and a second voltage source, wherein when the second switch is switched on, the output port is electrically connected to the second voltage source; a first control unit, electrically connected to the second switch, and converting the clock signal to an inverse clock signal, wherein the first control unit outputs a switch signal according to the inverse clock signal, and the switch signal is used for switching on the second switch; a resistor; a third switch, electrically connected to the output port and the resistor, wherein the resistor is connected between a third voltage source and the third switch in series; when the third switch is switched on, the output port is electrically connected to the third voltage source, and the output port outputs a voltage decay signal; and a second control unit, electrically connected to the first control unit and the third switch, and switching on the third switch according to the inverse clock signal and the switch signal.