Digital shade control for color CRT background and cursors

Details Digital shade control for color CRT background and cursors Digital shade control for color CRT background and cursors

1982-08-30

1984-08-21

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340703, 340704, 340709, 358 27, G09G 128

Patent

active

044673221

ABSTRACT:
A color cathode ray tube is provided in a color monitor of a video display terminal. The red, green and blue color video input lines are connected to novel control circuits which permit the selection of several different shades of colors for the background or cursor. The circuits which control the background colors are pulse modulated to provide digital shade control of the background color selected and automatically control the color of the cursor so that a contrasting color is provided.

REFERENCES:
patent: 3668686 (1972-06-01), Strohmeyer
patent: 3911418 (1975-10-01), Takeda
patent: 4310838 (1982-01-01), Suso et al.
patent: 4388639 (1983-06-01), Cox et al.

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