Fast-working LCD residual display suppression circuit and a method thereto

摘要

The invention relates to a fast-working residual display suppression circuit for LCD and a method thereto. The method includes the following steps: receiving a control signal; if the control signal is an automatic control signal, comparing a first reference voltage with a fixed difference to a supply voltage to a second reference voltage according to an externally input start signal; as the first reference voltage<=the second reference voltage, outputting an activating signal to an LCD power controller and a fast discharge circuit; if the control signal is a manual control signal, directly outputting the activating signal in order to drive the LCD power controller and the fast discharge circuit and cutting off the power supply to the fast discharge circuit by the LCD power controller according to the activating signal and combining two discharge paths of the fast discharge circuit to produce an optimal discharge path to speed up the discharge rate.