Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1997-08-08
2000-10-10
Bettendorf, Justin P.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
315370, H01J 2954
Patent
active
061305057
ABSTRACT:
A system and method for dynamic adjustment of video images on a cathode ray tube in diverse geographic local magnetic fields. The present invention uses a CRT magnetometer that accurately senses differences in the strength and direction of a local magnetic field in three axes, i.e., the x, y, and z axes. The cathode ray tube includes a digital monitor board or monitor circuitry that has a processor and memory and is capable of retrieving correction factor data and magnetic correction data generated by a vision system. The digital monitor board receives CRT magnetometer signals and uses the signals with magnetic correction data to adjust the correction factor data to generate locale specific correction factor data for the sensed local magnetic field. The digital monitor board is capable of decoding the locale specific correction factor data using DACs, PDMs, PWMs, and interpolation engines to generate correction signals that are used to adjust the video image to correct for magnetically induced distortion.
REFERENCES:
patent: 4388619 (1983-06-01), Beck
patent: 4725763 (1988-02-01), Okuyama
patent: 4851775 (1989-07-01), Kim
patent: 5565897 (1996-10-01), Kikinis et al.
patent: 5583401 (1996-12-01), Inoue et al.
patent: 5847511 (1998-12-01), Lee
Simpson Ron C.
Webb James R.
Bettendorf Justin P.
Cochran William W.
Display Laboratories Inc.
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