Patent ID: 6937218

Claim:
A method for driving a liquid crystal display device including a memory type liquid crystal layer that exhibits at least two stable states, a plurality of common electrodes and a plurality of segment electrodes, wherein the common electrodes are scanned so as to be selected a-line-at-a-time, characterized in that An, Bn and Wn being determined such that L·(At·An+Bt·Bn+Wt·Wn) is not longer than a certain time period, and the voltage for making said layer into on-display being set higher than the voltage for making said layer into off-display; where L is a total number of the common electrodes, At (sec) is a selection time period for each of the common electrodes when the voltage making said layer into on-display is applied to said layer, An is a scan number for applying the voltage for making said layer into on-display at least one time, scanning the common electrodes so as to select all common electrodes on by one, Bt (sec) is a selection time period for each of the common electrodes when the voltage for making said layer into off-display is applied so said layer, Bn is a scan number for applying the voltage for making said layer into off-display, Wt (sec) is a selection time period for each of the common electrodes when the voltage corresponding to a display data is applied to said layer, and Wn is a scan number for applying the voltage corresponding to a display data to said layer, an on-voltage to make said layer into on-display is set to be higher than an off-voltage to make said layer into off-display, an on-voltage is applied to said layer, and an off-voltage is applied to said layer, and a voltage corresponding to a display data is applied to said layer.