Patent · US Expired

Luminescent phosphor screen containing catena-polyphosphate

US5739632A · kind A · utility

4Cited by

4References

9Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Markus Haase · Aachen, DE
Helmut Bechtel · Aachen, DE
Wolfram Czarnojan · Aachen, DE
Walter Mayr · Alsdorf, DE
Joseph Lauter · Aachen, DE

Key dates

Filing date	Dec 1, 1995
Grant date	Apr 14, 1998
Priority date	—
Expiry date	Dec 1, 2015

Classification

Technology area (CPC H)Electricity
CPC primaryH01J29/185
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

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 comprises one or more catena-polyphosphates of one or more alkaline earth metals, zinc, cadmium and/or manganese. 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 acts as a stabilizing protective coating which limits the corrosion processes in sulphide and/or selenide-containing phosphors induced by low-energy radiation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.