Process for the sequential control of a liquid crystal matrix di

Details Process for the sequential control of a liquid crystal matrix di Process for the sequential control of a liquid crystal matrix di

1987-03-16

1988-07-26

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350346, 350331R, 350336, 340784, G02F 113, G09G 336

Patent

active

047596090

ABSTRACT:
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.

REFERENCES:
patent: 3675988 (1972-07-01), Soref
patent: 3854072 (1974-12-01), Trogdon
patent: 4082430 (1978-04-01), Schulthess et al.
patent: 4392718 (1983-07-01), Morrison
Displays, vol. 7, Jan. 1986, pp. 3 to 11.

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