Nematic liquid crystal storage display device

Details Nematic liquid crystal storage display device Nematic liquid crystal storage display device

1985-10-17

1986-07-22

Corbin, John K.

350331R, 350341, G02F 113

Patent

active

046015426

ABSTRACT:
A bistable nematic liquid crystal display cell is electrically switched between topologically equivalent, asymmetric horizontal states. Switching is initiated by application of a symmetry breaking field such as a DC electric field of a predetermined polarity. An AC 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 are formed to have a parallel tilt boundary condition.

REFERENCES:
patent: 4333708 (1982-06-01), Boyd et al.
patent: 4400060 (1983-08-01), Cheng
DeGennes, P. G., The Physics of Liquid Crystals, (Clarendon Press, Oxford), pp. 188-191.
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.
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.

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