RESEARCH AND DEVELOPMENT OF TWO-COLOR DIRECT VIEW STORAGE TUBE WITH SELECTIVE ERASURE.
Interim development rept. for 1 Apr-1 Jul 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 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. The higher count collector mesh has effectively minimized the color moire effect. Additional uniformity improvement was achieved with a longer rear bulb assembly. The red phosphate phosphor is least sensitive to processing techniques and has given the best red light output. Additional effort is required to eliminate green contamination of the red phosphor during red dot-green field printing. The writing and erasing speeds continue to be below the objective requirements. The stored resolution requirement has been achieved. A tube was constructed having a decay of 105 seconds to 50 of equilibrium brightness. Based on earlier calculations this would be adequate to achieve the required one-minute storage time without noticeable color shift. Experimental verification of this must be delayed until a tube with full, uniform color shift is achieved.