Co-ordinate addressing of smectic display cells

Details Co-ordinate addressing of smectic display cells Co-ordinate addressing of smectic display cells

1980-12-23

1983-12-06

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

350350S, G09G 336

Patent

active

044196644

ABSTRACT:
A co-ordinate matrix addressing system is used to address a liquid crystal display cell containing a positive dielectric anisotropy smectic material. For this purpose one or more direct voltage pulses are applied across selected elemental volumes of the display to convert them from a focal-conic scattering state to a homeotropically aligned state. Prior to this all elements are electrically driven into the turbulent scattering state which relaxes into the focal-conic scattering state upon removal of the driving field. The driving field may also take the form of direct voltage pulses.

REFERENCES:
patent: 3575492 (1971-04-01), Nester
patent: 4139273 (1979-02-01), Crossland et al.
patent: 4196974 (1980-04-01), Hareng et al.
Electric Field Effects on Biphenyl Smectic A Liquid Crystals; Hareng et al; Appl. Phys. Lett.; vol. 25, #12; 12/74, pp. 683-685.

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