Colour picture display tube

Details Colour picture display tube Colour picture display tube

H - Electricity

01

J

313/35.11

H01J 29/08 (2006.01) H01J 29/80 (2006.01) H01J 31/20 (2006.01) H01J 31/48 (2006.01)

Patent

CA 1194075

13 ABSTRACT A deflection colour selection system for a single beam channel plate display tube. Within an envelope of a display tube there is provided a laminated dynode channel plate electron multiplier (16) having channels whose exit apertures are conveniently aligned in columns. An aper- tured extractor electrode (36) is mounted on and electric- ally insulated from an output face of the electron multi- plier (16), the apertures (42) in the extractor electrode (36) being aligned with a respective channel. A lumines- cent screen (14) is spaced from the extractor electrode (36), the screen (14) comprising a repeating pattern of phosphor elements (R, G, B) adapted to luminesce in dif- ferent colours, each pattern comprising one of each type of phosphor element only. A current multiplied electron beam (34) exiting from an aperture in the extractor electrode is deflected onto an associated pattern of phosphor elements by pairs of first (38) and second (40) deflector electrodes insulated electrically from each other and the extractor electrode, the first (38) and second (40) deflector elec- trodes being disposed as pairs between each column of apertures (42) in the extractor electrode (36). All the first (38) electrodes are interconnected as are the second (40) electrodes. By having pairs of electrodes (38, 40) a good resolution is obtainable and misalignment errors between the electron multiplier (16) and the screen (14) can be corrected electrically.

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