MANUFACTURE OF LUMINESCENT SCREEN ASSEMBLY ON CATHODE-RAY TUBE SUBSTANCE AND OF LUMINESCENT SCREEN ASSEMBLY ON INNER SURFACE OF FACEPLATE PANEL FOR COLOR CATHODE-RAY TUBE ELECTROPHOTOGRAPHY METHOD

摘要

A method of electrophotographically manufacturing a luminescent screen assembly (22) on a substrate (18) of a CRT (10) includes the steps of coating the substrate with a conductive layer (32) and overcoating the conductive layer with a photoconductive layer (34), establishing an electrostatic charge on the photoconductive layer, and exposing selected areas of the photoconductive layer to visible light to affect the charge thereon. Then, the selected areas of the photoconductive layer are developed with triboelectrically charged, dry-powdered, surface-treated screen structure materials. The improved method increases the adherence of the surface-treated materials to the photoconductive layer by contacting the surface-treated materials with a solvent to render the photoconductive layer and the materials tacky. The dried screen is fixed with a plurality of coatings of an aqueous alcohol mixture of dichromated polyvinyl alcohol or potassium silicate and then filmed, aluminized and baked to form the screen assembly.