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Deformographic Storage Display Tube

IP.com Disclosure Number: IPCOM000087857D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cahill, JG: AUTHOR [+6]

Abstract

The deformographic storage display tube (DSDT) operates on the principle of generating minute deformations in a deformable material by the establishment of an electrostatic force from charges deposited by a cathode-ray beam. The deformations in the material are translated into a visual image by projection through a Schlieren optical system. The uniqueness of the DSDT is its construction, which provides it with a temporally and spatially controllable image persistence capability.

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Deformographic Storage Display Tube

The deformographic storage display tube (DSDT) operates on the principle of generating minute deformations in a deformable material by the establishment of an electrostatic force from charges deposited by a cathode-ray beam. The deformations in the material are translated into a visual image by projection through a Schlieren optical system. The uniqueness of the DSDT is its construction, which provides it with a temporally and spatially controllable image persistence capability.

The DSDT screens consist of a monocrystalline mica film covered by an elastomer layer and a top silver coating. Electric charge written onto the mica by a 10 KeV beam, for example, causes the elastomer to deform so that reflected illumination from the silver-coated side of the elastomer layer displays the information stored on the screen. Screen erasure is effected by flooding the mica film with, for example, 2.5 KeV electrons.

In the long term operation of the tube, however, deterioration of the storage capability of the mica has limited the DSDT from realizing its full potential. Significant improvements in the storage attributes of the DSDT appear to have been made by coating a target, at low temperatures, with a boro-silicate glass layer on the gun side of the target. In addition, it appears that uniformity is increased and sensitivity improved by such a glass coating. Compared with poor and patchy storage observed in uncoated DSDT targets that fail...