Storage tube comprising electro-luminescent phosphor and cadmium sulfide field sustained conducting target

Abstract

Abstract This invention provides a high resolution direct view storage tube which, in addition to having superior resolution capabilities, also requires less complex circuitry than standard type direct view storage tubes. More particularly, a meshless storage tube is disclosed which makes use of a meshless multilayered thin film structure as a combined image storage and display medium. The principle components of this structure include a thin film electronic storage medium, an opaque antifeedback layer, and an electroluminescent image display layer. In operation, a bias voltage is maintained across the entire structure, and a high resolution image is initially impressed upon the storage medium by means of a scanning electron beam. The scanning beam creates local conductivity modulations within the storage film which correspond to the input image, and these modulations, in turn, alter local field configurations across the electroluminescent layer, thus creating a visible output image. After initial scanning, the conductivity modulations in the storage layer are maintained for an extended period of time (several tens of seconds) provided that an applied electric field continues to be maintained. This phenomenon is hereinafter referred to as ''''field sustained conductivity.'''' Removal or reversal of the applied electrical field restores the storage element to its initial insulating condition, and the screen is thereby erased.

Inventors

• 👤 William P Bleha Jr
• 👤 Ronald F Scholl

Bibliographic Details