CRT video text layout system having horizontal scrolling

Details CRT video text layout system having horizontal scrolling CRT video text layout system having horizontal scrolling

1977-06-06

1979-07-10

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

354 6, 340724, 340748, G06K 1520

Patent

active

041609816

ABSTRACT:
A circuit in a video layout system permits the operator to view any portion of text material whose width exceeds that of a display screen of a CRT. The circuit has an operator controllable, variable reference signal generator which provides a signal whose amplitude with respect to an initial amplitude is related to the desired direction and degree of scrolling. This reference signal is subtracted from the horizontal deflection ramp signal to produce an offset ramp signal. A comparator compares the ramp and reference signals and blanks the electron beam until the ramp exceeds the reference to prevent text information from being displayed on the parameter section of the display screen.

REFERENCES:
patent: 3403391 (1968-09-01), McCown
patent: 3540012 (1970-11-01), Ehrman
patent: 3637997 (1972-01-01), Petersen
patent: 3668685 (1972-06-01), Horvath
patent: 3696391 (1972-10-01), Peronneau
patent: 3742288 (1973-06-01), Albrecht et al.
patent: 3801961 (1974-04-01), Coombe
patent: 3872460 (1975-03-01), Fredrickson et al.

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