Electrically controllable device having variable optical qualities or system which is holographic, thermotropic or which has suspended particles
作者： Gregoire Mathey , Jean-Christophe Giron
DOI:
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摘要: The invention relates to an element having variable optical properties, comprising (a) a light diffusion system which can be electrically controlled, said being of the valve or liquid crystal mode, suspending particle holographic thermotropic (a') is associated with (b) at least one absorbing within realm visible. especially used in production overhead projection screens.
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