Apparatus for compensation for image rotation in a crt display

Details Apparatus for compensation for image rotation in a crt display Apparatus for compensation for image rotation in a crt display

G - Physics

09

G

375/46, 317/9

G09G 1/00 (2006.01) H04N 3/22 (2006.01)

Patent

CA 1302598

83-450 ABSTRACT OF THE DISCLOSURE 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.

562304

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