The determination of the acceptability of off-centerline viewing for large projected display devices should consider the unique optical characteristics of the projection screen.
Additional Information: High-gain projected display screens should have an off-centerline viewing angle of less than 25 degrees for beaded screens and less than 30 degrees for high-gain metallic screens. Loss of general brightness for high-gain projected screens is usually not a problem until these limits have been exceeded. Excessive viewing angles may further reduce perceived resolution by reducing the effectiveness of color codes and image contrast on projected screens. Thus, the combined effects of
off-centerline viewing upon image distortion and screen characteristics should be considered.5908, 2090