Projection type green cathode ray tube, method for...

Details Projection type green cathode ray tube, method for... Projection type green cathode ray tube, method for...

H - Electricity

01

J

313/35.154

H01J 29/20 (2006.01)

Patent

CA 1182854

- 27 - Abstract of the Disclosure A projection type green cathode ray tube (CRT) with improved brightness despite an increase in the temperature of the faceplate, a method for manufacturing a phosphor screen adopted therein, and a projection video device which utilizes the projection type green CRT. The phosphor screen of the CRT is formed of a cerium-activated calcium sulfide phosphor which contains 0.01 to 0.3 mo?% of cerium. According to the method for manufacturing the phosphor screen, the cerium-activated calcium sulfide phosphor is precipitated in a 0.3 to 5% aqueous solution of water glass based on weight. This aqueous solution does not contain barium ions. The projection video device includes the green CRT, a red CRT having a phosphor screen which is formed of an europium-activated yttrium oxide phosphor, and a blue CRT having a phosphor screen which is formed of a silver- activated zinc sulfide phosphor. Brightness of images is improved and does not substantially change over time.

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