ANTIFERROELECTRIC LIQUID CRYSTAL DEVICES

摘要

A drive system for, and method of driving, an antiferroelectric liquid crystal display device (10) that has an array of addressable pixels, each of which is defined between a pair of electrodes. The system comprises a voltage generation means operable to apply the following sequence of monopolar voltage pulses (1 to 7) to at least one of the pair of electrodes which define at least one selected pixel of the display device (10): (a) a first selection pulse (1) operable to drive the selected pixel to a first activated state; (b) a first bias pulse (2) operable to cause the selected pixel to attain a predetermined grey scale level; (c) a first erasure pulse (3) of opposite polarity to that of the first selection pulse (1) and operable to erase the memory of selected pixel and to switch the pixel to a relaxed inactive state; (d) a reset pulse (4) operable to allow the pixel to reset in the relaxed state; (e) a second selection pulse (5) of opposite polarity to that of the first selection pulse (1) operable to switch the selected pixel to a second activated state; (f) a second bias pulse (6) operable to cause the selected pixel to attain a predetermined grey scale level; (g) a second erasure pulse (7) of opposite polarity to that of the second selection pulse (5) operable to cause the selected pixel to switch to the relaxed inactive state and erase the memory of the pixel; and (h) a reset pulse (8) operable to allow the pixel to reset in the relaxed state.