In a liquid crystal projection t.v. system the color gradient over the projected image, which is due to angular sensitivity of the dichroic mirrors, is minimized by introducing a field lens (61,62,63) next to the light values or LC-panels (21, 22, 23) in the light paths of the blue (b.sub.B), green (b.sub.G)...http://www.google.de/patents/US5060058?utm_source=gb-gplus-sharePatent US5060058 - Modulation system for projection display
