Method of changing the chromaticity of a cathodoluminescent phos

Details Method of changing the chromaticity of a cathodoluminescent phos Method of changing the chromaticity of a cathodoluminescent phos

1987-09-30

1989-08-22

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Screen

313467, 313473, 313478, 350 16, 358253, H01J 2989

Patent

active

048599026

ABSTRACT:
Phosphors used in colour cathode ray tubes, particularly but not exclusively projection television tubes, have colour point standards or chromaticities modified to conform to European Broadcasting Union (EBU) standards by disposing an interference filter in the light-path from the phosphor, for example, between the phosphor and the faceplate, which has a peak gain greater than unity over a selected part of the frequency spectrum. As a result, an efficient broadband phosphor can be employed to obtain the desired chromaticity and thereby increase the white-D luminance of projection television systems.

REFERENCES:
patent: 3742277 (1973-06-01), Peters
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4647812 (1987-03-01), Vriens et al.
patent: 4683398 (1987-07-01), Vriens et al.
EBU Standard for Chromaticity Tolerances for Studio Monitors, EBU Technical Center, Techn. 3213-E, Brussels, Aug. 1975, pp. 1-5.

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