Electrooptical element switchable between a plurality of metabst

Details Electrooptical element switchable between a plurality of metabst Electrooptical element switchable between a plurality of metabst

1997-06-09

2000-06-06

Parker, Kenneth

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within nematic phase

349160, G02F 113, C09K 1902

Patent

active

060725583

ABSTRACT:
A display characteristic of a high contrast ratio and a high transmittance through the application of a chiral nematic liquid crystal medium switchable between metastable states via Frederick's transition is utilized as a liquid crystal electrooptical element. The electrooptical element employs a white light source and is switchable between metastable states in which the polarization axes of both polarization plates are set to predetermined angles P and A according to the initial state of the liquid crystal medium and the product, R, of the thickness, d, and the difference, .DELTA.n, in the refractive indices of the liquid crystal medium for extraordinary light, n.sub.e, and ordinary light, n.sub.o (.DELTA.n=n.sub.e -n.sub.o).

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