Mechanically multistable liquid crystal cell

Details Mechanically multistable liquid crystal cell Mechanically multistable liquid crystal cell

1979-11-30

1982-06-08

Bauer, Edward S.

350340, 350341, 350334, G02F 1133

Patent

active

043337082

ABSTRACT:
A liquid crystal cell having memory is provided by disposing a liquid crystal material having nematic directors between two substrates which are fabricated to contain an array of singular points. The cell may further include means for detaching singularities such as appropriate electrode arrangements.
These substrate configurations provide multistable configurations of the director alignments because disclinations must be moved, either through the bulk of the liquid crystal material or on the substrate surfaces to switch between the stable configurations.
The switching of the device between stable configurations may be accomplished by the application of electrical fields to the liquid crystal material.
The stable configurations may be optically differentiated by the incorporation of pleochroic dyes into the liquid crystal material or by crossed polarizers.

REFERENCES:
patent: 4002404 (1977-01-01), Dir
patent: 4030997 (1977-06-01), Miller et al.
patent: 4128313 (1978-12-01), Cole et al.
Porte: "Surface Disclination Lines Observed in Nematic Liquid Crystals . . . " Le Jrnl, De Physique, May 1977, pp. 509-517.
Porte et al.: "A Phase Transition-Like Instability . . . ", Le Jrnl. De Physique, Feb. 1978, pp. 213-223.
Saito et al: "Field-Induced Distortion of the Molecular Orientation . . . ", Jpn. J. Appl. Phys., 1979, pp. 1627-1628.
Bigelow: "Observations of a Bistable Twisted Nematic Liquid Crystal Effect," IEEE, Trans. on Elec. Devices, Sep., 1975 pp. 730-733.

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