An electro-optical filter (22) typically for use in a still or video camera (10). The camera (10) is provided with a lens (14) for focusing an image of the subject (12) onto focal plane (16) of the camera (10). A recording medium is placed at the focal plane (16). Light emanating or reflected from the...http://www.google.fr/patents/US5953082?utm_source=gb-gplus-shareBrevet US5953082 - Electro-optical active masking filter using see through liquid crystal driven by voltage divider photosensor
Electro-optical active masking filter using see through liquid crystal ...
