Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1985-12-10
1987-02-03
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358168, H01J 2952, H04N 557
Patent
active
046410635
ABSTRACT:
For an ultra high resolution color picture tube display, a level-shifting circuit is interposed between each of the three video output amplifiers and the three picture tube cathodes receiving video drive. In the level-shifting circuit, d.c. control voltages from adjustment potentiometers are applied to a voltage-controlled current source which provides voltage-compliant control input to a current-controlled voltage source which provides the adjustable d.c. offset voltage interjected between each video output amplifier and a corresponding picture tube cathode, providing individual background adjustment and brightness tracking adjustment compensation for cutoff spreads between the three picture tube guns and providing user brightness control action all independent of operating bias point voltages in the video amplifiers, so that they can be design-optimized for maximum bandwidth to achieve ultra high resolution.
REFERENCES:
patent: 4096517 (1978-06-01), Hinn
patent: 4270126 (1981-05-01), Bafaro
patent: 4300074 (1981-11-01), Diddens et al.
Blum Theodore M.
Cain D.
McTaggart J. E.
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