Constant writing speed arc scan CRT display system

Details Constant writing speed arc scan CRT display system Constant writing speed arc scan CRT display system

1978-09-18

1979-10-16

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, H01J 2978

Patent

active

041715047

ABSTRACT:
An arc-scanned sector cathode ray tube display system achieves constant writing speed by developing trigonometric X and Y deflection signals with amplitude linearly decreasing and scan rate linearly increasing as arcs are drawn from periphery toward apex of the display sector. Video/deflection synchronism is achieved by development of a video clock pulse train comprised of selected pulses from a clock source by means of which displayed video bits are shifted from rho-theta formated storage on a time/position basis such that video and beam position are synchronized to within one displayed picture element throughout the sector display.

REFERENCES:
patent: 3805109 (1974-04-01), Cowan
patent: 3975662 (1976-08-01), Janosky

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