Polymer dispersed liquid crystal display with birefringence of t

Details Polymer dispersed liquid crystal display with birefringence of t Polymer dispersed liquid crystal display with birefringence of t

1991-12-20

1993-04-27

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 70, 359 98, G02F 113, G02F 11335

Patent

active

052067475

ABSTRACT:
A liquid crystal apparatus (30) comprising a containment medium (56), a birefringent liquid crystal material (38) and a pleochroic dye (54) contained in the liquid crystal material The difference between the ordinary and extraordinary indices of refraction of the liquid crystal material is between about 0.23 and 0.30. The liquid crystal material is dispersed in plural volumes in the containment medium. A pleochroic dye may be present in the liquid crystal material in a concentration of about 0.5% to 3.0%. The apparatus has enhanced backscattering in the field-off state and enhanced light transmission in the field-on state.

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