Process for the sequential control of a liquid crystal matrix display means having different optical responses in alternating and steady fields

摘要

A process for the sequential control of a liquid crystal display means having different optical responses in alternating and steady fields. This process consists of applying to one side of a first electrode an a.c. potential V.sub.1 and to the other side an a.c. potential V.sub.2, with V. sub.2 -V.sub.1 constant, so that only line Y parallel to the sides of the first electrode is exposed to a reference potential V.sub.0 ; applying to one side of a second electrode an a.c. potential V.sub.3 and to the other side an a.c. potential V.sub.4, with V. sub.4 -V.sub.3 constant, so that only the line X parallel to the sides of the second electrode, intersecting the first, is exposed to V.sub.0 ; and applying a d.c. potential V.sub.5 to the two sides of one electrode, so that liquid crystal zone XY defined by the intersection of lines X and Y is only subject to potential V.sub.5 and that outside the zone the liquid crystal is subject to an a.c. potential difference, the displayed state of the zone resulting from a positive polarity of V.sub.5, the undisplayed state resulting from a negative polarity of V.sub.5 and the maintaining of a state resulting from the elimination of V.sub.5.