Test and Evaluation of Electronic Image Generation and.Projection Devices Volume II - Evaluation of Television Systems

摘要

This report presents data from an evaluation of the 7WP4 Projection Cathode Ray Tube (CRT) operated in the high resolution mode of 1029-line scanning configuration to produce a suitable display for simulation training. The capabilities of the CRT were first predicted by theoretical analysis conducted while the tube was in actual operation, then the actual display was analyzed to confirm the theoretical predictions. The test image projected on a screen was viewed by an observer television camera to reduce the displayed image to electronic waveforms which formed the basis for an accurate evaluation. The results obtained during the practical evaluation of the CRT in all ways confirmed the theoretical-predictions. The CRT showed a resolution potential-greater than the 800-line prediction with a high level of brightness, and adequate grey scale linearity. Spot size was found to vary inversely with the scanning speed;line width is reduced at the faster scanning rates. Resolving capability, limited by spot size, is shown related to both brightness and scanning.