Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-03-18
1998-08-25
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315398, G09G 104, H01J 2954
Patent
active
057986215
ABSTRACT:
An electron beam tends to slope downwardly as it is deflected horizontally to form a raster in a video display apparatus. The sloping of the beam can cause geometric errors in the raster, for example, orthogonality and parallelogram errors. A raster correction circuit offsets orthogonality and parallelogram errors in a raster by modulating a horizontal deflection current at a vertical scanning rate. The raster correction current is phased in relation to a horizontal-rate deflection current such that scan lines in an upper-half portion of the raster are shifted to the right, and scan lines in a lower-half portion of the raster are shifted to the left.
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Knight Peter Ronald
Smith Lawrence Edward
Truskalo Walter
Issing Gregory C.
Laks Joseph J.
Metelski Marion P.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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