Direct-view bistable storage tube

Tek's (Tektronix) Robert H. Anderson refined Haeff's concepts in the late 1950s to produce a reliable and simple DVST.

This CRT replaced the conventional light-emitting phosphor layer on the face of the tube screen with a scotophor such as potassium chloride (KCl).

KCl has the property that when a crystal is struck by an electron beam, that spot would change from translucent white to a dark magenta color.

Using conventional deflection and raster formation circuitry, a bi-level image could be created on the membrane and retained even when power was removed from the CRT.

One such device, the D36 Image Display, was made by DICOMED Corporation and a technical paper was presented at the 1972 Electro-Optical Conference in Geneva, Switzerland.