Independent top/bottom pincushion correction

Details Independent top/bottom pincushion correction Independent top/bottom pincushion correction

1987-01-06

1988-08-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

047663545

ABSTRACT:
Top and bottom pincushion correction signals with separately controllable amplitude, phase and tilt are provided. A switching signal developed from the vertical ramp operates a plurality of switches for selectively applying the top and bottom correction signals to the carrier input of a multiplier. The modulator input of the multiplier is supplied with the vertical ramp and the output of the multiplier consists of a conventional "bow tie" correction signal with each half of the bow tie being separately controllable.

REFERENCES:
patent: 3995196 (1976-11-01), Lehnert
patent: 4093895 (1978-06-01), Collette
patent: 4395662 (1983-07-01), Sexton
patent: 4496882 (1985-01-01), Oliver et al.

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