RESEARCH AND DEVELOPMENT OF TWO-COLOR DIRECT VIEW STORAGE TUBE WITH SELECTIVE ERASURE.
Interim development rept. for 1 Jul-1 Oct 64,
HUGHES AIRCRAFT CO OCEANSIDE CALIF
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A direct view storage tube is being developed which is capable of displaying stored information in either of two colors or in intermediate hues, and selectively erasing that information. The operating principle is based on the fact that flood electrons which pass through holes in the storage mask when the storage-surface potential is near cutoff, fall within small areas on the viewing screen opposite the storage mask 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 of the viewing screen. The viewing screen consists of two phosphors. One occupies small areas in register with the storage-mask holes, while the other occupies areas surrounding the first. Included in this report are design and performance data on four ten-inch two-color tubes which were built during the report period. Three different phosphor dot patterns were evaluated in these tubes two patterns consisted of a phosphor dot of one color in a field of a second color. Such patterns, with only one set of dots, simplify screening methods. Experiments were performed using a new phosphor Sylvania europium activated yttrium vanadate. Tubes will be made using this phosphor. Author