Dual mode crt screen

Claim 1

A MULTIPLE MODE CATHODE RAY TUBE SCREEN FOR PRESENTING A DISPLAY OF DIFFERING PERSISTENCE COMPRISING: A. AN ENVELOPE HAVING A VIEWING AREA WITH A SCREEN SUPPORTING SURFACE RELATED THERETO, B. A DUAL PHOSPHOR SCREEN FORMED ON THE INSIDE OF SAID SUPPORTING SURFACE, SAID DUAL PHOSPHOR SCREEN BEING COMPOSED OF A FIRST PHOSPHOR MATERIAL RESPONSIVE TO OPTICAL AND CATHODE RAY EXCITATION AND EXIBITING A PHOSPHORESCENCE OF SUBSTANTIALLY SHORT PERSISTENCE IN THE VISIBLE SPECTRUM AND A SECOND PHOSPHOR MATERIAL RESPONSIVE TO OPTICAL AND CATHODE RAY EXCITATION AND EXHIBITING A PHOSOPHORESCENCE IN THE NON-VISIBLE SPECTRUM, AND DUAL PHOSPHOR MATERIAL BEING APPROXIMATELY 50% PHOSPHOR EMITTING IN THE ULTRAVIOET, HAVING MEDIUM OR LONG PERSISTENCE, AND APPROXAMATELY 50% SHORT PERSISTENCE GREEN PHOSPHOR, AND SAID PHOTOCONDUCIVE MATERIAL BEING ULTRAVIOLET SENSITIVE, C. A PHOTOCONDUCIVE MATERIAL WHOSE RESISTANCE BECOMES NEGLIGIBLE PHOSPHORESCENCE, NON-VISIBLE PHOSPHORESCENCE, D. A FIRST TRANSPARENT ELECTRODE LAYERED BETWEEN THE OUTSIDE SURFACE OF SAID FACE PLATE ANND SAID PHOTOCONDUCIVE MATERIAL, E. AN ELECTROLUMINESCENT MATERIAL RESPONSIVE TO EXCIATION BY THEPRESENCE OF AN ELECTRIC FIELD, F. A SECOND TRANSPARENT ELECTRODE LAYER BETWEEN SAID PHOTOCONODUCIVE MATERIAL AND SAID ELECTROLUMINESCENT MATERIAL, G. A THIRD TRANSPARENT ELECTRODE LAYER ON THE OUTSIDE SRFACE OF SAID ELECTROLUMINESCENT MATERIAL WHEREBY A VOLTAGE MAY BE ESTABLISHED ACROSS SAID FIRST AND THIRD ELECTRODES THAT PORTION OF SAID ELECTRKO-LUMINESCENT MATERIAL AS SAID PHOSPER SCREEN IS SCANNED BY THE ELECTRON BEAM OF SAID CATHODE RAY TUBE.