Patent ID: 7098883

Claim:
A liquid crystal display drive method, said liquid crystal display comprising: a first electrode located on a first substrate, and a second electrode located on a second substrate, said substrates facing each other with liquid crystal filled there between, wherein pictures are displayed by means of a voltage signal impressed between said first and second electrodes to select at least one state of incident light: either reflected or non-reflected; or either transmitted or non-transmitted; or either polarized or non-polarized; or twisted or non-twisted; wherein a drive voltage waveform comprising a display signal period and a control signal period irrelevant to display is used within one frame; wherein said drive voltage waveform comprises a plurality of bit planes and the control signal period occurs during a pro-elected number of successive bit planes within the plurality of bit planes; wherein the ratio of said control signal period to the whole drive voltage waveform period is between about five percent and about fifty percent: wherein one of the two states, either on or off, is chosen to select the state of incident light in said display signal period; and wherein, in said control signal period, a reset voltage which has the polarity opposite to that of drive voltage waveform in said display signal period or is continuous DC voltage is impressed to suppress generation of internal DC voltage, caused by ionic polarization in the liquid crystal.