Liquid crystal reusable signature comparison

Details Liquid crystal reusable signature comparison Liquid crystal reusable signature comparison

1982-07-27

1985-06-25

Corbin, John K.

350330, 350346, 350350S, 350351, G02F 1137, G02F 1133

Patent

active

045250324

ABSTRACT:
A liquid crystal display comprises a layer of cholesteric or smectic liquid crystal material contained between a front and rear wall. A pen having a tip is caused to move across the front wall causing an observable change in the liquid crystal under the pen tip. The change in liquid crystal material may be between its grandjean or planar state and focal conic state. This change may be caused by local pen tip pressure, heat, light or electric field. Erasure of observed information is by flexing of the liquid crystal layer. Alternatively heating and cooling, or an electric field may be used to erase the information. A resistive layer covers the front wall so that the instantaneous position of the pen can be fed through bus bars to a computer. This computer compares the electrical version of an observed signature on the display with a stored signature.

REFERENCES:
patent: 3111646 (1963-11-01), Harmon
patent: 3133266 (1964-05-01), Frishkopf
patent: 3642348 (1972-02-01), Wysocki et al.
patent: 3647279 (1972-03-01), Sharpless et al.
patent: 3684828 (1972-08-01), Maher
patent: 3697687 (1972-10-01), Larson et al.
patent: 3790709 (1974-02-01), Heywang
patent: 4024500 (1977-05-01), Herbst et al.
patent: 4317005 (1982-02-01), de Bruyne
patent: 4318096 (1982-03-01), Thornburg et al.
patent: 4345239 (1982-08-01), Elliott
patent: 4396997 (1983-08-01), Kahn et al.
patent: 4405921 (1983-09-01), Mukaiyama
patent: 4418242 (1983-11-01), Kouno

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