Dynamic focus correction circuit
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United States of America Patent
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Oct 3, 1995
Grant Date -
N/A
app pub date -
Aug 17, 1993
filing date -
Aug 17, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Dynamic focus circuits for generating a dynamic focus signal for focusing an electron beam on a CRT, the signal being proportional to a function of the vertical deflection Y and horizontal deflection X of the beam according to X.sup.2 +Y.sup.2 +X.sup.2 f(Y) or X.sup.2 +Y.sup.2 +Y.sup.2 f(X), where f(Y) or f(X) is a positive symmetric function. The resultant dynamic focus signal has increased magnitude as the beam moves away from the center of the screen, thus providing proper focusing at the corners of the screen as well as at the center and sides of the screen.
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