Patent ID: 7336269

Claim:
A control circuit, for an LCD device having a power module, a host control unit, and an image display unit, the power module supplying a plurality of potential levels for the LCD device, the control unit controlling a plurality of gate driving signals and a plurality of source driving signals for the image display unit, the control circuit comprising: a signal delay unit, coupled to the image display unit; and a signal detecting unit, coupled to the host control unit, wherein the signal detecting unit detects an on/off status of the LCD device from the host control unit, provides a disable signal to the power module, such that the voltage potential levels are disabled except a pixel transistor turning-on level, a plurality of pixel transistors of the image display unit are discharged via sources of the pixel transistors, and provides an all-gate-on signal to the signal delay unit, the all-gate-on signal is delayed for a first delay time by the signal delay unit and outputs to the image display unit.