Method and apparatus for correcting image errors caused by residual magnetism in a picture tube
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United States of America Patent
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-
Aug 22, 2000
Grant Date -
N/A
app pub date -
Nov 20, 1998
filing date -
Nov 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and apparatus for correcting image errors caused by residual magnetism in monitors and other such display devices based on picture tubes. The method according to the invention is based on the removal of residual magnetism by means of an alternating damped magnetic field. In the method, the internal and external structures in the neck part (11) of a picture tube (10) are subjected to an alternating damped magnetic field produced by means of a coil (45).
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