Structure and method for eliminating blocked apertures caused by charged particles

摘要

A structure and method is proposed for eliminating so-called halo-blocked apertures in color picture tubes. The halo-blocked apertures are caused by insulative negatively-charged particles attached to the gas-sorbing conductive getter metal film on the inside surface of the shadow mask which deflect the transmitting portions of an electron beam. The structure comprises a source within the tube for depositing a gas-sorbing conductive getter metal overlay on the charged particle to render the particle conductive so that the particle cannot deflect the beam.