Polymer dispersed liquid crystal display device with asymmetric

Details Polymer dispersed liquid crystal display device with asymmetric Polymer dispersed liquid crystal display device with asymmetric

1995-05-04

1997-05-13

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349112, G02F 11333, G02F 11335

Patent

active

056297858

ABSTRACT:
A display device comprises a polymer dispersed liquid crystal film that includes one or more translucent regions and one or more transparent regions. The back side of the polymer dispersed liquid crystal film is illuminated by collimated light. The front side of the polymer dispersed liquid crystal film is optically coupled to an asymmetric optical diffuser. The asymmetric optical diffuser comprises a plurality of light paths that transmit collimated light emanating through a transparent region of the film, but excludes diffuse light emanating from a translucent region. A preferred asymmetric optical diffuser comprises glass microspheres in a black matrix. In this manner, the asymmetric diffuser substantially improves contrast between a transparent region and a translucent region of a display.

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Doane, J.W. et al. "Polymer Dispersed Liquid Crystals for Display Application," Mol. Cryst. Liq. Cryst. (1985) vol. 165, ppl. 511-532.
Vance, D.W. "Novel High-Resolution Ambient-Light-Rejecting Rear-Projection Screen," SID 94 Digest (1994) pp. 741-744.

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