Electro-optical device wherein orientation layers have grating structure and comprises birefringent material with refractive indices equal to electro-optic medium
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Oct 25, 1996
filing date -
Feb 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Switchable electro-optic medium (2) between two substrates (3, 4) at least one of which carries a grating structure (7, 8) at the side of the electro-optic medium, which grating structure has refractive indices which are substantially identical to those of the medium in the non-isotropic state. In the isotropic state diffraction occurs at the grating structure due to a difference in refractive index so that the central beam (11) decreases in intensity. Based on this principle, light shutters for, for example projection display but also beam splitters, colour selectors and beam deflectors may be realized.
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