Picture tube screen device having waiting state function

Details Picture tube screen device having waiting state function Picture tube screen device having waiting state function

1994-05-10

1996-02-20

Groody, James J.

Television

Cathode-ray tube display excessive voltage control

With disabling

348380, 315 94, 315101, H04N 568

Patent

active

054933366

ABSTRACT:
For preserving and, thus, for extending the useful life of a picture tube of a picture tube screen device having a waiting state function. The filament current of the picture tube in the waiting state of the picture tube screen device is reduced by at least a slight percentage of an original filament current. Also, the picture tube is supplied with another video signal, in addition to an original video signal, that generates a beam current in the picture tube having a white image level that is at least a slight percentage of an original white image level generated by the original video signal.

REFERENCES:
patent: 3514532 (1970-05-01), Ludlan
patent: 3767967 (1973-10-01), Luz
patent: 3944880 (1976-03-01), Harao et al.
patent: 3956669 (1976-05-01), Del Ciello
patent: 4149110 (1979-04-01), Dallos
patent: 4553166 (1985-11-01), Sutton
patent: 4641191 (1987-02-01), Sutton
patent: 4722005 (1988-01-01), Ledenbach

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