Display tube

Details Display tube Display tube

H - Electricity

01

J

313/35.151

H01J 29/20 (2006.01) C09K 11/77 (2006.01) H01J 29/18 (2006.01) H01J 29/28 (2006.01)

Patent

CA 1216880

ABSTRACT: "Display tube." A display tube comprising in an evacuated enve- lope means to generate at least one electron beam which is focused on a display screen and describes a field thereon, which display screen comprises a terbium-activated blue- luminescing phosphor on a carrier, and in which the light emitted by the phosphor falls through a filter, If the energy of the emissions of the phosphor which find their origin in the 5D3-level of terbium is at least 40% of the energy of the emissions of all terbium levels and the fil- ter has a transmission of more than 75% at those wave- lengths where the 5D3 ? 7F5 and the 5D3 ? 7F4 emissions of terbium are located and the filter has a transmission of less than 10% at those wavelengths where the 5D4 ? 7F5 and the 5D4 ? 7F4 and the 5D4 ? 7F3 emissions of terbium are located so that the colour point of the filtered light is located in the range x ? 0.200 and y ? 0.100 in the CIE colour triangle, a well saturated blue picture is displayed having a satisfactorily high energy efficiency.

466730

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