Linearity correction apparatus

Details Linearity correction apparatus Linearity correction apparatus

1991-10-28

1993-01-12

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315400, G09G 104, H01J 2956

Patent

active

051793229

ABSTRACT:
Linearity correction apparatus for a raster scanned cathode ray tube display device is presented. The apparatus comprises first means (16) for generating a correction signal to correct an asymmetric non linearity in a sawtooth electron beam line deflection current. The line deflection current is generated by a line timebase circuit for energising electromagnetic electron beam deflection coils of the cathode ray tube. The apparatus further comprises second means (70,90,91) cooperative with the first means (16) and responsive to a change in line timebase frequency for compensating a variation in the correction signal generated by the first means (16) in response to said change in line timebase frequency.

REFERENCES:
patent: 4283663 (1981-08-01), Miyoshi et al.
patent: 4677350 (1987-06-01), Wharton et al.
patent: 4871951 (1989-10-01), Teuling et al.

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