Vertical deflection circuit

Details Vertical deflection circuit Vertical deflection circuit

1986-05-27

1987-04-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2954

Patent

active

046599681

ABSTRACT:
Circuitry for automatically vertically centering a video display on the face of a CRT when deviations result from different raster scanning times. A comparator 12 having inputs flanking a resistor 11 connected in series with the vertical deflection coil 3 detects the zero or picture plane center crossing points of the deflection signal. The zero crossing points are then time compared with a pulse signal (FIG. 3(e)) whose width represents the overall time duration of each raster scan for the picture or image being displayed, and a d.c. correction component is applied as necessary to the deflection signal such that the adjusted zero crossing points bisect the duration pulses to thus vertically center the display.

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