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Element with variable optical properties, for use e.g. in back-projection screens operating by transmission, comprises an electrically operated system with variable light diffusion, e.g. a liquid crystal system, and light-absorbing elements
Element with variable optical properties, for use e.g. in back-projection screens operating by transmission, comprises an electrically operated system with variable light diffusion, e.g. a liquid crystal system, and light-absorbing elements
An element with variable optical properties (I) based on (a) an electrically operated system with variable light diffusion based on optical valve or liquid crystal systems, a system with particles in suspension or a holographic or thermotropic system (a') also incorporates (b) element(s) showing light absorption, at least in the visible range.
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