Dried oriented Purple-Membrane (PM)-films were fabricated by electrosedimentation of aqueous PM-suspensions on ITO-covered slides. The photoelectric signals of illuminated films were used to switch twisted-nematic (TN)- and ferroelectric (FE) liquid-crystal (LC) cells. Due to the quasi differential behaviour of the photocurrent with respect to illumination intensity, a PM/TN system represents an inherent novelty filter. The use of FE-LC cells for permanent data display is demonstrated and a prototype of a pixelated BR-LC-OASLM is presented.