Apparatus for compensating for image rotation in a CRT display
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United States of America Patent
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-
Jun 4, 1991
Issued Date -
N/A
app pub date -
Nov 29, 1989
filing date -
Mar 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image rotation compensation circuit for use with a CRT. The compensation circuit includes a winding which encircles the CRT and is oriented transverse to the path of the electron beam. A controller is connected to the winding and drives a current through the winding to create a magnetic field. The direction and magnitude of the current may be adjusted by the user to substantially cancel an external magnetic field and thus eliminate any image rotation caused thereby.
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