CRT focus correcting method, CRT focus correcting circuit and display unit
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United States of America Patent
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May 30, 2000
Grant Date -
N/A
app pub date -
Nov 19, 1997
filing date -
Jul 28, 1997
priority date (Note) -
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Abstract
A CRT focus correcting method and correcting circuit are arranged as follows. Size data of a picture size set externally are compared with size data of a reference picture size, and when it is detected that a picture size has been changed, calculation correction data are obtained based on reference correction data and both the size data. When a parabola waveform voltage based on the calculation correction data is applied to a focus coil, a CRT focus is corrected according to a change in the picture size.
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