Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1974-01-30
1976-09-14
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315384, 340324A, H01J 2978
Patent
active
039809269
ABSTRACT:
High speed, spiral scan display apparatus capable of producing distortion free visual presentations from stored video data, and a method for preventing occurrence of visible distortion caused by switching transients in such apparatus. The visual presentations are generated by display writing means which traces a circular path on a display area. The radius of the circular path is periodically incremented to provide for scanning the entire display area. Visible distortion resulting from rapidly changing the path radius is prevented by blanking the display writing means for an interval of time immediately following each radius change. Data storage requirements are minimized by ordering and retrieving video data so that only data sequentially needed during unblanked intervals is supplied to the display writing means.
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Blum T. M.
Honeywell Inc.
Wilbur Maynard R.
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