Cathode ray tube
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYasuo Iwasaki, Koji Yajima
Life of this patent
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Abstract
A cathode ray tube comprises a face plate glass containing neodymium oxide (Nd.sub.2 O.sub.3); and a phosphor screen of plural color phosphors formed on an inner surface of said face plate glass wherein a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) or a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) is used as a green phosphor of said phosphor screen.
Claims6
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd.sub.2 O.sub.3) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y.sub.2 O.sub.2 S:Eu), and said green phosphor is a phosphor of zinc sulfide activated with copper and aluminum (ZnS:Cu, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
A cathode ray tube having a face plate glass which contains neodymium oxide (Nd.sub.2 O.sub.3) and exhibits a sharp main absorption band having a peak at about 580 nm and a sub-absorption band at about 530 nm and on the inner surface of which a phosphor screen having blue, green and red phosphors is formed, wherein said blue phosphor is a phosphor of zinc sulfide activated with Ag(ZnS:Ag), said red phosphor is a phosphor of yttrium oxysulfide activated with Eu(Y.sub.2 O.sub.2 S:Eu) and said green phosphor is a phosphor of zinc sulfide activated with copper, gold and aluminum (ZnS:Cu, Au, Al) to reduce the spectral reflectance of said phosphor screen at the wavelength band of 470-480 nm so that the chromaticity point of a reflected exterior light reflected from said phosphor screen is prevented from displacement with respect to the chromaticity point of an exterior light due to the influence of said main and sub-absorption bands.
Dependencies are inferred from the claim text.