Bidirectional deflection and display systems
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United States of America Patent
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-
Jul 29, 1997
Issued Date -
N/A
app pub date -
Sep 12, 1996
filing date -
Dec 10, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A symmetrical square wave, having zero average value, is coupled to the input of a horizontal deflection yoke through an S-shaping capacitance. A negative resistance coupled to the output of the yoke has a negative resistance value which compensates for resistive losses in the yoke. A yoke current generated in the yoke will be a symmetrical triangular waveform. A first control loop adjusts the negative resistance value to assure successive zero value crossings of the yoke current are coincident in time with each center of successive horizontal scan lines. A second control loop adjusts the square wave to assure successive level transitions of the square wave are coincident in time with successive changes of scanning direction.
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