Beam index display tube and display system including the beam in

Details Beam index display tube and display system including the beam in Beam index display tube and display system including the beam in

1988-10-11

1990-01-16

Blum, Theodore M.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 924

Patent

active

048947113

ABSTRACT:
A beam index display tube which has a screen structure enabling a circular spot to be used and has vertical beam indexing.
The screen (18) comprises a plurality of transversely extending, substantially contiguous lines (36 to 46), each line being composed of a plurality of triplets of different color emitting elements (R, G, B) and index elements (20) distributed along each line in accordance with a predetermined pattern. The phosphor elements in each triplet are spatially separated from each other, the intervening spaces being left empty, being occupied by an index element or being filled with a black matrix material. Additionally by staggering the triplets between adjacent lines then considered in a direction transverse to that of the spot scanning, no phosphor element is adjacent another phosphor element.
Vertical indexing is made possible by the index elements (20) being offset heightwise relative to the direction of scanning. Alternate elements (20) are offset in alternate directions so that it is possible to determine if the scanning electron beam is too high or too low because additional indexing signals are generated.

REFERENCES:
patent: 2685047 (1954-07-01), Moore
patent: 3443139 (1969-05-01), Thompson
patent: 3732359 (1973-05-01), Chen

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