Method of manufacturing a colour television display tube and...

Details Method of manufacturing a colour television display tube and... Method of manufacturing a colour television display tube and...

H - Electricity

01

J

316/13

H01J 9/00 (2006.01) H01J 9/227 (2006.01)

Patent

CA 1131694

13-9-1970 1 PHN 9073 "ABSTRACT" "Method of manufacturing a colour television display tube and tube thus manufactured". A method of manufacturing a colour televi- sion display tube in which, for providing luminescent phosphor particles on the screen, a photoconductive layer is provided with a uniform charge which may be either positive or negative. On said layer a charge pattern is formed by scanning the display window via the colour selection electrode by means of an electron beam the electrons of which penetrate through the photoconductive layer. The charge disappears in the places hit by the electron beam. The remaining charge pattern is developed by means of a suspension of charged phosphor particles. By repeating the method, patterns of red, green and blue luminescent phosphor particles can successively be pro- vided. It is also possible to scan a light-absorbing layer simultaneously or successively by means of three electron beams and to develop the thus obtained charge pattern with light-absorbing pigment.

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