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US 5,684,358 AGranted
Luminescent screen
AssigneeU.S. Philips Corporation
InventorsMarkus Haase, Helmut Bechtel, Wolfram Czarnojan, Dieter Wadow
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AssigneeU.S. Philips Corporation
InventorsMarkus Haase, Helmut Bechtel, Wolfram Czarnojan, Dieter Wadow
Estimating the term…
The invention relates to a display screen comprising a phosphor composition of a sulphide and/or selenide-containing phosphor which is provided with a coating which is composed of germanium disulphide and/or germanium diselenide. In such a display screen, in particular a low-energy cathode ray display screen, the advantages of the efficient sulphide or selenide-containing phosphors can be used and said display screen remains bright and rich in contrast for a long period of time because the coating, which is composed of germanium disulphide and/or germanium diselenide, surprisingly acts as a stabilizing protective coating which limits the corrosion processes in sulphide and/or selenide-containing phosphors induced by low-energy radiation.
A display screen provided with a layer of a phosphor composition, said phosphor composition comprising at least one member of the group consisting of sulfide and selenide containing phosphors coated with a coating comprising at least one germanium compound of the group consisting of germanium disulphide and germanium diselenide.
Dependencies are inferred from the claim text.