| 摘要 |
A color cathode ray tube has raster scan color zones defined by X and Y positional signals derived from a stroke vector generator and stored in a digital memory. Raster scan and stroke vector displays are alternately presented in a hybrid display. The display face of the tube is scanned by a plurality of raster lines and a color transition point is defined by the intersection of a stroke vector with a raster line. The X and Y addresses of the intersection points define the raster line, pixel element, and color at the transition point. The system is arranged so that the X and Y addresses are provided by the stroke vector generator in synchronous relation with the color transition points, and read into memory during the stroke vector refresh period. During the raster scan refresh period, the memory contents are recalled in synchronism with the raster scan, passed through a digital to analog converter, and then applied to the display tube to provide filled-in color zones superposed on the stroke vector display. The reduced memory requirements and controller access time permit dynamically rotating symbology in a synthetic display for aircraft flight instrumentation.
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