Raster display apparatus

Details Raster display apparatus Raster display apparatus

G - Physics

09

G

375/19

G09G 1/24 (2006.01) G06F 3/033 (2006.01) G09G 5/02 (2006.01) G09G 5/22 (2006.01)

Patent

CA 1148285

RASTER DISPLAY APPARATUS ABSTRACT A raster display apparatus capable of displaying graphic pictures includes a processor for loading character codes (pointers) in a character buffer. The pointers address a character/cell generator to derive the bit patterns necessary to refresh the display under control of refresh logic. As the picture becomes increasingly complex, re- quiring more and more different character cells, the character/ cell generator fills. Space is created by combining two or more adjacent cells into a single low-resolution-displayed cell: an op. code associated with each character code (pointer) determines whether the cell is to be displayed at full or reduced resolution and causes the refresh logic to clock bit patterns associated with low resolution cells at a slower rate. Optionally, the processor changes low reso- lution parts of the picture to high resolution when an operator interacts with the low resolution part using a light pen. UK9-77-024

339741

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