Patent ID: 7432900

Claim:
A liquid crystal display drive method for a liquid crystal display having a first electrode located on a first substrate and a second electrode located on a second substrate, said first substrate and said second substrate facing each other with liquid crystal filled therebetween, the method comprising the steps of: displaying pictures using a voltage signal impressed between said first and second electrodes to select one state of incident light which is (a) either reflected or non-reflected, (b) either transmitted or non-transmitted, (c) either polarized or non-polarized, or (d) twisted or non-twisted; applying a drive voltage waveform having a display signal period and a control signal period irrelevant to display within a given drive time, a period of plural frames, or one frame; and choosing one of an on state and an off state to select the one state of incident light in said display signal period, wherein, a time ratio of said control signal period to a whole period of the drive voltage waveform is between 5% and 50%.