Patent ID: 6342759
Filing Date: 2002-01-29
Classification: H01J

Abstract:
A color cathode ray tube comprising an evacuated envelope including a panel portion, a neck portion and a funnel portion for connecting said panel portion and said neck portion, said panel portion including a faceplate, a plural-color phosphor screen formed on an inner surface of said faceplate, said plural-color phosphor screen including a multiplicity of phosphor dots of a plurality of colors, a shadow mask having a multiplicity of apertures therein and spaced from said phosphor screen, and said neck portion having a plural-beam in-line type electron gun housed therein;said plural-color phosphor screen being configured such that a first horizontal phosphor dot pitch Ph on a horizontal center line of a useful area of said phosphor screen at a first predetermined distance from a center of said useful area of said phosphor screen toward sides of said useful area is less than or equal to 101% of a second horizontal phosphor dot pitch Ph at said center of said useful area, said first predetermined distance being two-thirds of a distance from said center of said useful area to said sides of said useful area, a third horizontal phosphor dot pitch Ph at corners of said useful area being larger than said second horizontal phosphor dot pitch Ph at said center of said useful area, and a first vertical phosphor dot pitch Pv at said corners of said useful area being smaller than a second vertical phosphor dot pitch Pv at said center of said useful area; wherein a vertical phosphor dot pitch Pv is defined as a vertical distance between a first horizontal row of said multiplicity of said phosphor dots and a second horizontal row of said multiplicity of said phosphor dots adjacent to said first horizontal row, and a horizontal phosphor dot pitch Ph is defined as a horizontal distance between a first phosphor dot of a first color of said plurality of colors in said first horizontal row and a second phosphor dot of said first color in said second horizontal row which is nearest to said first phosphor dot.