A One-Gun Shadow-Mask Color Kinescope

A direct-view shadow-mask three-color kinescope employing a single electron gun is described. Color selection in this tube is accomplished by controlling the direction of approach of a single electron beam to a direction-of-approach sensitive color screen. For sequential presentation the beam is shared in time sequence between the three primary colors. For simultaneous presentation the beam is shared continuously among the three primary colors. The new problems presented by the one-gun shadow-mask color kinescope arise from the special requirements placed on the electron optical system, from the need for deflecting the beam into different color positions, and in the case of sequential presentation, from the necessity for blanking-off the beam as it is switched from one color position to the next. Practical solutions to these and other problems are presented.