Method and means for controlling electron beam in a raster scan

Details Method and means for controlling electron beam in a raster scan Method and means for controlling electron beam in a raster scan

1980-11-03

1983-01-25

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

73618, 340728, 340747, G09G 116

Patent

active

043706460

ABSTRACT:
In a raster scan display in which electron beam energization during raster line scan is controlled by comparing a raster value to stored magnitude digital data as a raster line is scanned, a control signal for energizing the electron beam includes a lower bandwidth video signal whereby energization of the electron beam can be anticipated. A comparator of the raster line value to stored magnitude digital data generates a pulse which is applied to three serially connected latches. Logic circuitry connected to the latches generates pulses which are applied to digital to analog converter circuitry which generates the video control signal.

REFERENCES:
patent: 3697976 (1972-10-01), Fenton
patent: 3878536 (1975-04-01), Gilliam
patent: 4068310 (1978-01-01), Friauf
patent: 4231032 (1980-10-01), Hara et al.
patent: 4276563 (1981-06-01), Heitmann et al.

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