Raster display apparatus

Details Raster display apparatus Raster display apparatus

1979-12-03

1981-12-29

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340728, 340750, G06F 3153

Patent

active

043085326

ABSTRACT:
A raster display apparatus capable of displaying graphic pictures includes a processor 13 for loading character codes (pointers) in a character buffer 12. The pointers address a character/cell generator 22 to derive the bit patterns necessary to refresh the display 1 under control of refresh logic 19. As the picture becomes increasingly complex, requiring more and more different character cells, the character/cell generator 22 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 13 changes low resolution parts of the picture to high resolution when an operator interacts with the low resolution part using a light pen 30.

REFERENCES:
patent: 3553676 (1971-01-01), Raciti
patent: 3737890 (1973-06-01), Salava
patent: 3903517 (1975-09-01), Hafner
patent: 3988728 (1976-10-01), Inoue et al.
patent: 3999167 (1976-12-01), Ito et al.
patent: 4081799 (1978-03-01), Granberg et al.
patent: 4121283 (1978-10-01), Walker
patent: 4156238 (1979-05-01), Glasson et al.
Jordan and Barrett; "A Cell Organized Raster Display for Line Drawings"; Communications of the ACM; vol. 17, No. 2, pp. 70-77, Feb. 1974.
IBM Systems "Reference Manual for IBM 5985 Color Display Control Unit, Model H02 and IBM 5941 Display Console Model H02," 3rd edition, Mar. 1975, 42 pages.

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