Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1982-05-14
1985-02-12
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
315382, 340720, 340739, 358 22, 358218, G09G 128
Patent
active
044994575
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.
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Principles of Interactive Computer Graphics, Newman & Sproull, McGraw Hill pub., 1973, call No. T385 u4.
Evans & Sutherland Computer Corp.
Trafton David L.
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