The determination of the acceptability of off-centerline viewing for large group-view devices should consider both the spatial distortion of the image and the effect of the viewing angle upon screen characteristics such as brightness and color rendition.
Additional Information: Individual viewers in a fixed location should be no more than 10 degrees off the centerline. For multiple viewers, the preferred limit should be 20 degrees and an acceptable limit should be 30 degrees off the centerline. These angle limits address spatial distortion of the displayed image caused by the viewing angle. However, off-centerline viewing of large-screen display devices may also result in (1) loss of general brightness for high-gain screens, and (2) loss of color rendition in
projection-type devices caused by the angles of reflection of the separate projection elements. All these factors should be considered.5908, 2090