Liquid crystal device with louver means located behind the liqui

Details Liquid crystal device with louver means located behind the liqui Liquid crystal device with louver means located behind the liqui

1971-07-26

1977-05-10

Pitrelli, John F.

Card, picture, or sign exhibiting

Check, label, or tag

Reinforced

40130R, 350160LC, 350267, G02F 134, G02F 130, G09F 1306

Patent

active

040219453

ABSTRACT:
A display device comprises a pair of transparent substrates sandwiching therebetween a liquid crystal material which is reversibly switchable between transparent and forward light scattering states. Disposed behind the device, between it and a source of illumination, is a louver means comprising a plurality of elongated vanes of a dull black, light absorbent color. The louver is so disposed relative to a viewer of the device and the source of illumination as to provide a continuous, black background for the device.

REFERENCES:
patent: 3401267 (1968-09-01), Engle et al.
patent: 3499112 (1970-03-01), Heilmeier et al.

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