Patent ID: 7151516

Claim:
An active matrix liquid crystal display device configured to invert a polarity of a voltage on a common electrode by row or by frame, comprising: a common voltage supply circuit provided to supply a common voltage to said common electrode; and a charge collection and resupply circuit connected between said common electrode and said common voltage supply circuit, said charge collection and resupply circuit comprising: a first switch connected between said common electrode and said common voltage supply circuit; a charge collection capacitor; a second switch connected between a connection point of said common electrode and said first switch and said charge collection capacitor; a switch control unit provided to control turning on and off of said first and second switches, said switch control unit being configured to operate such that immediately before a polarity of said common voltage is inverted, said first switch is turned off and said first switch is turned on substantially immediately after inversion of the polarity of said common voltage and wherein said second switch is turned on after said first switch is turned off and said second switch is turned off before said first switch is turned on.