Phase correction arrangement for deflection circuit

Details Phase correction arrangement for deflection circuit Phase correction arrangement for deflection circuit

1984-01-23

1986-04-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315388, 315399, H01Q 100

Patent

active

045845034

ABSTRACT:
A circuit for use in a video display apparatus corrects raster shift due to beam current variations. A horizontal retrace related pulse is applied to the ramp generator for the horizontal deflection phase control circuit, causing the retrace AC zero crossing of the ramp to shift under high beam current conditions. The phase control circuit then shifts the ramp signal to center the synchronizing pulses about the zero crossing, resulting in a raster shift which compensates for the raster shift introduced due to beam current variations.

REFERENCES:
patent: 4063133 (1977-12-01), Nero et al.
patent: 4202013 (1980-05-01), van Hattum et al.
patent: 4298829 (1981-11-01), Luz

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