Patent
1985-10-17
1986-07-22
Corbin, John K.
350331R, 350341, G02F 113
Patent
active
046015434
ABSTRACT:
A bistable nematic liquid crystal display cell is switched between topologically equivalent, asymmetric horizontal states. Switching is initiated by application of a directional, symmetry breaking field such as a transverse magnetic field. An electric potential is then applied across the cell to complete the switching cycle and maintain the state. The cell includes upper and lower parallel substrates, upper and lower topographically textured tilt alignment surfaces on the corresponding substrates, and nematic liquid crystal material between the substrates. In an active region of the cell, the tilt alignment surfaces form an equal reverse tilt boundary condition. In an isolation region surrounding the active region of the cell, the tilt alignment surfaces form a parallel tilt boundary condition.
REFERENCES:
patent: 4214819 (1980-07-01), Pohl et al.
patent: 4333708 (1982-06-01), Boyd et al.
patent: 4400060 (1983-08-01), Cheng
Meyer, Robt. B., "Distortion of a Cholesteric Structure by a Magnetic Field," Applied Physics Lett., vol. 14, No. 7 (Apr. 1969), pp. 208-209.
DeGennes, P. G., The Physics of Liquid Crystals, (Clarendon Press, Oxford), pp. 188-191.
J. Appl. Phys. 53(6), Jun. 1982, "Optical Properties of a New Bistable Twisted Nematic Liquid Crystal Boundary Layer Display" by R. N. Thurston, Julian Cheng and G. D. Boyd, pp. 4463-4479.
Appl. Phys. Lett. 40(12), Jun. 15, 1982, "A Nematic Liquid Crystal Storage Display Based on Bistable Boundary Layer Configurations" by J. Cheng, R. N. Thurston and G. D. Boyd, pp. 1007-1009.
J. Appl. Phys. 52(4), Apr. 1981, "Boundary-Layer Model of Field Effects in a Bistable Liquid-Crystal Geometry" by Julian Cheng and R. N. Thurston, pp. 2756-2765.
Boyd Gary D.
Cheng Julian
Meyer Robert B.
Thurston Robert N.
AT&T Bell Laboratories
Businger Peter A.
Corbin John K.
Gallivan Richard F.
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