Shadow mask color system with calligraphic displays

Details Shadow mask color system with calligraphic displays Shadow mask color system with calligraphic displays

1984-06-20

1990-11-13

Trafton, David

Communications: electrical

Land vehicle alarms or indicators

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

340732, 340736, 340744, 340751, 315395, 315368, G09G 128

Patent

active

049705008

ABSTRACT:
A display system is disclosed utilizing a cathode ray display device utilizing three electron beams which are directed through a shadow mask to excite three-color phosphor dots, and which is incorporated in a system to alternately provide raster scan display signals and calligraphic display signals to obtain the benefits of both raster scan and calligraphic displays (dot or line drawings). A deflection unit is disclosed with the X and Y deflection coils each driven by two pairs of transistor circuits. The transistor circuits are controlled so that alternatively one transistor in each set passes current to provide bi-directional currents at desired levels to obtain specific beam displacement. A resistive element between individual deflection coils provides an indication of deflection current, which indication is processed by a differential amplifier to indicate displacement. In accordance with the instant position of the beam, a convergence unit is controlled to reflect spherical considerations. Specifically, the convergence of each color beam is varied in accordance with first and higher orders of X and Y displacement. Focus is controlled to avoid certain effects and obtain others.

REFERENCES:
patent: 3577031 (1971-05-01), Welsh et al.
patent: 3891889 (1975-06-01), Fazio
patent: 4138726 (1979-02-01), Girault et al.
patent: 4200866 (1980-04-01), Strathman

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