Co-ordinate addressing of smectic display cells

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

1983-08-25

1985-07-09

Curtis, Marshall M.

Communications: electrical

Continuously variable indicating

With meter reading

340784, 350350S, G09G 336

Patent

active

045285624

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. Unselected elemental volumes may be refreshed to substantially their original level of focal-conic scattering by means of a suitable blanking potential applied to both selected and unselected elemental volumes which nevertheless leaves previously restored elemental volumes in the homeotropically aligned state.

REFERENCES:
patent: 3575492 (1971-04-01), Nester et al.
patent: 4139273 (1979-02-01), Crossland et al.
patent: 4196974 (1980-04-01), Hareng et al.
Submicrosecond Bistable Electro-Optic Switching in Liquid Crystals, Appl. Phys. Lett., 36(11); Jun. 1980; Clark & Lagerwall; pp. 899-901.

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