Television display error correction

Details Television display error correction Television display error correction

1979-10-29

1981-10-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

335213, 313430, H01J 2956

Patent

active

042963591

ABSTRACT:
To correct the effects of an in-line electron gun mount rotation error on a kinescope display screen, initially the horizontal deflection axis of the yoke is aligned with the actual axis of alignment of the electron guns. The resultant rotated raster is then rotated into alignment with the kinescope major and minor axes through the use of a magnetic field disposed orthogonal to the yoke deflection fields. The magnitude of the field is selected to effect the desired magnitude of raster rotation, while the polarity of the field is selected to effect the desired direction of raster rotation. In one embodiment, a coil of wire placed to abut the kinescope funnel in front of the deflection yoke and powered by a variable DC voltage source provides the desired magnetic field. In another embodiment, a permanent magnet ring takes the place of the coil -DC source combination.

REFERENCES:
patent: 2898509 (1959-08-01), Clay et al.
patent: 2907914 (1959-10-01), Brownell
patent: 2962621 (1960-11-01), Fernald
patent: 4145677 (1979-03-01), Maruyama et al.

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