Gec-marconi Limited

Colin T Yeoh

Alan Mosley

Michael C Wiltshire

Mark F Charsley

Philip G White

Stephen J Lister

Ferroelectric liquid crystal device having frequency .ltoreq.500 Hz and

Display devices

In a method of driving a ferroelectric liquid crystal display, a blanking pulse of width 2t.sub.s followed, after a delay of n.multidot.t.sub.s (where n is an integer), by a writing pulse of width t.sub.s and of opposite polarity to the blanking pulse are applied to successive row address lines at intervals of 2t.sub.s. Pairs of bipolar data pulses of width t.sub.s are applied to column address lines so that the data pulses coincide with the blanking pulse applied to the ith row and the writing pulse applied to row i-(n+1)/2 for odd values of n and to row 1-(n+2)/2 for even values of n. The data pulse amplitude may be varied in order to obtain variable grey levels in the display.

Ferroelectric liquid crystal devices

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London, United Kingdom

Colin T Yeoh