Color television picture tube image screen having positive and n

Details Color television picture tube image screen having positive and n Color television picture tube image screen having positive and n

1976-11-02

1978-07-11

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313470, H01J 2907, H01J 2932, H01J 3120

Patent

active

041004523

ABSTRACT:
This disclosure depicts a color television picture tube having an evacuated envelope, an electron gun, a color selection electrode defining a pattern of electron beam passing apertures and a multi-color image screen. The image screen has a corresponding pattern of triads of red-light-emissive, blue-light-emissive and green-light-emissive phosphor elements. The elements are spaced each from one another by a light absorbing material. The tube is characterized by having within at least selected triads in said pattern of triads a first phosphor element and associated electron beam landing area with either a positive or negative tolerance condition. The remaining two phosphor elements and associated beam landing areas have an opposite tolerance condition to that obtained for the first phosphor element.

REFERENCES:
patent: RE26251 (1967-08-01), Kaplan
patent: 3146368 (1964-08-01), Fiore et al.
patent: 3569761 (1971-03-01), Lange
patent: 3890527 (1975-06-01), Patel et al.
patent: 3988632 (1976-10-01), Dietch

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