Static information storage and retrieval – Radiant energy – Liquid crystal
Patent
1984-06-29
1986-10-14
Popek, Joseph A.
Static information storage and retrieval
Radiant energy
Liquid crystal
350333, G11C 1304
Patent
active
046176462
ABSTRACT:
A liquid crystal storage device includes a smectic phase liquid crystalline medium in spaced relationship with at least three separated electrodes, the first of which provides a ground plane and is in contact with the liquid crystal medium; a second electrode, spaced from the first electrode, is arranged in a mesh-like or finger electrode configuration, being likewise in contact with the liquid crystal medium; a third electrode is spaced by a dielectric medium from the second electrode, such third electrode being in either orthogonal or parallel relationship with the second electrode. Voltages are selectively applied to each of the second and third electrodes such that the stable state of the liquid crystalline layer is changed from the ordered (homeotropic) or clear state, to the disordered (focal conic) or dark state.
REFERENCES:
patent: 3703331 (1972-11-01), Goldmacher et al.
patent: 3967253 (1976-06-01), Tsuruishi
patent: 4105288 (1978-08-01), Geffeken et al.
patent: 4291948 (1981-09-01), Crossland et al.
R. A. Soref, "Field Effects in Nematic Liquid Crystals Obtained with Interdigital Electrodes", Journal of Applied Physics, vol. 45, No. 12, Dec. 1974, pp. 5466 to 5468.
International Business Machines - Corporation
Popek Joseph A.
Schlemmer Roy R.
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