Raster scan digital display system

Details Raster scan digital display system Raster scan digital display system

G - Physics

09

G

375/32

G09G 1/16 (2006.01) G09G 5/34 (2006.01) G09G 5/395 (2006.01)

Patent

CA 1220293

RASTER SCAN DIGITAL DISPLAY SYSTEM Abstract In a raster scan digital display system, a display image is stored, as coded characters or a bit map, which is larger than the display image. In order to define an image, within the stored image, for display, the addressing system for the memory (or memories) storing the image include a display image defining circuit. This circuit includes an address counter which is incremented to define successive addresses of data in a line of the displayed image, or row of characters therein. The circuit includes a first register to receive the initial address of a display image and a second register to receive a value indicating the width of the stored image. For the initial line (or character row) of a displayed image, the address counter is loaded from the first register and incremented from the initial address. For each subsequent line (or character row) the address from which the counter is incremented is the sum of the initial address of the previous line (or character row) and the value in the second register.

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