Nightvision compatible display with electrically activated infra

Details Nightvision compatible display with electrically activated infra Nightvision compatible display with electrically activated infra

1994-08-12

1997-03-25

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 77, 349104, 349175, 349193, 349363, G02F 11335, G02F 11347

Patent

active

056150326

ABSTRACT:
An electrically activated infrared filter utilizes a mixture of infrared absorbing dyes in liquid crystal which normally presents a substantial cross section of dye to absorb the infrared component of impinging light. Polarizing light to be parallel to the direction of liquid crystal alignment enhances the absorption of infrared components. In an alternative embodiment, a chiral additive to the liquid crystal solution increases the dye cross section density which, by absorption, attenuates a higher proportion of the infrared wavelengths. A predetermined voltage differential across the cell aligns the liquid crystal and dye molecules to the voltage gradient, presenting a substantially non-absorptive path to the infrared components of impinging light.

REFERENCES:
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patent: 4514085 (1985-04-01), Kaye
patent: 4606613 (1986-08-01), Urabe
patent: 4749261 (1988-06-01), McLaughlin et al.
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patent: 5074647 (1991-12-01), Fergason et al.
patent: 5280373 (1994-01-01), Ozawa et al.
Cole et al "Dependence of absorption and optical contrast of a dichroic dye guest on the pitch of a chiral nematic host" Appl. Phys. Letter, vol. 31, No. 2, Jul. 1977-pp. 58-59.

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