New bistable cholesteric liquid‐crystal display
DW Berreman, WR Heffner - Applied Physics Letters, 1980 - pubs.aip.org
We have made a new type of cholesteric liquid‐crystal display device that is bistable in the
absence of an applied field. One of the two stable states has 360° of twist between the two
surfaces. The other is an untwisted state, like an unstrained nematic with all directors
parallel. One method of switching is to apply a pulse of about 3 V or more between the cell
surfaces, to obtain the twisted state or a pulse of about 1.5–2 V to obtain the untwisted state.
Lesser pulses have no lasting effect. These switching characteristics have promise for …
absence of an applied field. One of the two stable states has 360° of twist between the two
surfaces. The other is an untwisted state, like an unstrained nematic with all directors
parallel. One method of switching is to apply a pulse of about 3 V or more between the cell
surfaces, to obtain the twisted state or a pulse of about 1.5–2 V to obtain the untwisted state.
Lesser pulses have no lasting effect. These switching characteristics have promise for …
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