Scanning circuit of electron tube displays

Details Scanning circuit of electron tube displays Scanning circuit of electron tube displays

2006-07-04

2006-07-04

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C348S806000

Reexamination Certificate

active

07071636

ABSTRACT:
The invention concerns a control circuit for an electron tube display comprising a deflection coil, the deflection coil being part of a scanning circuit and being coupled to a coil of a transformer powering a high voltage generator used to accelerate an electron beam, a phase locked loop being used to keep in phase the flyback pulses produced by the scanning circuit and the video signal synchronisation pulses, and comprising an electron beam current measuring circuit, a compensation circuit for compensating the phase difference between the flyback pulses and the video signal synchronisation pulses as a function of the measured current.

REFERENCES:
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patent: 5428269 (1995-06-01), Hedrick
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patent: 5600212 (1997-02-01), Hirtz et al.
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patent: 5652482 (1997-07-01), Tripod
patent: 6590620 (2003-07-01), Hirakawa
patent: 6645990 (2003-11-01), Askew et al.

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