Penetration-type color tube with phosphors separated by conductive barrier layer

Claim 1

A cathode ray tube having means therein to generate a plurality of electron beams of predetermined velocities to impinge on a plural-color cathodoluminescent screen formed on a related supporting surface relative to a viewing area thereof, said screen comprising: a first electron-responsive phosphor material disposed in a substantially uniform manner on said supporting surface; a separation barrier layer formed of uniform thickness in overlay relationship with said first phosphor material, said electron barrier separation layer being electrically connected to the anode of said tube and comprising molecular islands of a discontinuous metallic nucleation of aluminum, upon which is disposed an electron barrier of an electrically conductive oxide separation substance in the form of cadmium oxide that is substantially translucent to electromagnetic radiation and opaque to the penetration of said electron beams of predetermined velocity; and a second electron-responsive phosphor material disposed on said separation barrier layer facing said electron-generating means, said second phosphor having a color emission in substantially the red-related portion of the spectrum, said intermediately positioned separation layer being electrically conductive readily dissipates the electron charge from point of beam impingement thereon to provide color purity of the luminescence emitted by said second phosphor.