Light modulating materials comprising a liquid crystal phase dispersed in a birefringent polymeric phase
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United States of America Patent
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Feb 19, 1991
Issued Date -
N/A
app pub date -
Mar 20, 1989
filing date -
Nov 4, 1988
priority date (Note) -
Expired
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Abstract
A haze-free light modulating polymer dispersed liquid crystal (PDLC) material is disclosed which comprises a polymer matrix which is birefringent and possesses anisotropic optical properties similar to those of the dispersed liquid crystal microdroplets such that the PDLC material in its transparent state exhibits a refractive index that is matched for all directions of incident light providing for an optically clear, scatter-free film for all angles of view. Electrooptic light shutters are possible from this material which are transparent in the field OFF-state and opaque in the field ON-state or vice versa, depending upon the microdroplet structure and configuration of the light shutter device.
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