Blue luminescent cathode ray tube device with improved color...

Details Blue luminescent cathode ray tube device with improved color... Blue luminescent cathode ray tube device with improved color...

H - Electricity

01

J

313/35.151

H01J 29/86 (2006.01) H01J 29/89 (2006.01)

Patent

CA 1226891

ABSTRACT: Blue luminescent cathode ray tube device with improved color filtering system. CRT device for generating a bright blue light spot employing a silver-activated zinc sulfide capable of emitting blue radiation when excited by electrons and in which device, there is positioned outside of the faceplate of the tube envelope of the CR tube and in the path of the blue radiation, a transparent light filtering means comprising a concentrated solution of a soluble erbium salt and Methyl Violet 2B. Quite unexpectedly it is found that light emitted from the CRT device of this invention has drastically reduced radiation in the 440 - 450 nm region and the 470 - 540 nm region with practically no decrease in the desired radiation peak at 460 nm.

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