Two-color display storage tube

A two-color direct-view storage tube has been developed which is capable of displaying stored information in either of two primary colors, or in hues which are intermediate on the I. C. I. chromaticity diagram. Operation makes use of the fact that flood electrons which pass through the holes in the storage surface potential is near cutoff, fall within small areas on the viewing screen opposite the storage mesh holes, whereas flood electrons which pass through the holes when the potential is near its maximum, i. e., flood gun cathode potential, fall on larger overlapping areas on the viewing screen. The viewing screen consists of a pattern incorporating two phosphors, one of which occupies small areas in register with the storage mesh holes and the other, areas surrounding the first. The tube, which has been built in the 10" size, can be operated with simple circuitry, essentially the same as that required for conventional half-tone storage tubes.