Raster distortion correction circuit

Details Raster distortion correction circuit Raster distortion correction circuit

1991-06-28

1992-05-19

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104

Patent

active

051151715

ABSTRACT:
An East-West switching transistor is coupled between a flyback transformer primary winding and a horizontal deflection output transistor circuit to control retrace energy to obtain an East-West modulation of the deflection current amplitude as required for East-West pincushion raster correction. The East-West switching transistor isolates a retrace resonant circuit that includes a horizontal deflection winding from a flyback resonant circuit that includes the flyback transformer during a portion of retrace. The deflection winding is coupled to a common conductor to permit the use of a retrace voltage sample developed in the deflection winding as a feedback signal to synchronize the deflection current to the video signal. The arrangement reduces phase modulation of the deflection current as a function of beam current variations, that could be visible as a beam current dependent horizontal picture shift or a raster bending in a horizontal direction.

REFERENCES:
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 4429257 (1984-01-01), Haferl
patent: 4634937 (1987-01-01), Haferl
patent: 4890043 (1989-12-01), Davie
patent: 4906902 (1990-03-01), Haferl

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