ELECTRICALLY CONTROLLABLE DEVICE HAVING VARIABLE OPTICAL QUALITIES OR SYSTEM WHICH IS HOLOGRAPHIC,THERMOTROPIC OR WHICH HAS SUSPENDED PARTICLES

摘要

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.