Color cathode ray tube having improved color purity
OwnerShinji Fukumotoinventor
Life of this patent
Estimating the term…
Abstract
A color cathode ray tube includes a generally rectangular phosphor screen having a plurality of phosphor pixel line-trios each formed of three color phosphor pixels arranged in a line and a black matrix of opaque material having holes for defining areas of the phosphor pixels which are viewed through a panel, a shadow mask having a large number of mask apertures for color selection, and an electron gun. A distribution in area of center phosphor pixels of the phosphor pixel line-trios has sharp decreases, going from a center of the phosphor screen toward a periphery of the phosphor screen, in the vicinity of at least one of (a) top and bottom sides and (b) right and left sides, of a rectangular useful display area of the phosphor screen.
Claims16
A color cathode ray tube comprising:
- a vacuum envelope including a panel, a neck, and a funnel connecting said panel and said neck;
- a generally rectangular phosphor screen comprising a plurality of phosphor pixel line-trios each formed of three color phosphor pixels arranged in a line and coated on an inner surface of said panel, and a black matrix of opaque material having holes for defining areas of said phosphor pixels which are viewed through said panel;
- a shadow mask having a large number of mask apertures for color selection and closely spaced from said phosphor screen;
- and
- an electron gun housed within said neck,
- wherein a distribution in area of center phosphor pixels of said phosphor pixel line-trios has sharp decreases, going from a center of said phosphor screen toward a periphery of said phosphor screen, in the vicinity of at least one of (a) top and bottom sides and (b) right and left sides, of a generally rectangular useful display area of said phosphor screen.
A color cathode ray tube comprising:
- a vacuum envelope including a panel, a neck, and a funnel connecting said panel and said neck;
- a generally rectangular phosphor screen comprising a plurality of phosphor pixel line-trios each formed of three color phosphor pixels arranged in a line and coated on an inner surface of said panel;
- a shadow mask having a generally rectangular apertured area formed with a large number of mask apertures for color selection and closely spaced from said phosphor screen;
- and
- an electron gun housed within said neck,
- wherein a distribution in area of said mask apertures has sharp decreases, going from a center of said apertured area toward a periphery of said apertured area, in the vicinity of at least one of (a) top and bottom sides and (b) right and left sides, of said apertured area.
Dependencies are inferred from the claim text.