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Viscoelastic spatial light modulators and schlieren-optical systems for HDTV projection displays
Thin metallized viscoelastic layers coated by a mirror electrode and addressed by an active matrix are proposed for use in schlieren-optical light-valve projection systems for high-definition television (HDTV). The number of grating periods per picture element as well as the ratio of electrode width and grating period are discussed in view of resolution limits. Three concepts of full-color schlieren-optical projection systems for the above reflective viscoelastic spatial light modulators are described and compared. All three systems contain a light source, three spatial light modulators (one for each primary color), and a projection lens. The first concept is based on a very small light source and a correspondingly small stop; in the second concept, mirror bars are employed; and parallel light is assumed in the third concept.