G - Physics – 09 – G
Patent
G - Physics
09
G
375/23
G09G 1/00 (2006.01) G06T 7/00 (2006.01) G09G 5/395 (2006.01)
Patent
CA 1227585
RASTER SCAN DIGITAL DISPLAY SYSTEM WITH DIGITAL COMPARATOR MEANS Abstract In a bit mapped raster scan digital display system, a number of maps each contain a single component of the display data and are read together to provide sets of bytes, each set representing eight pel defining groups. A compare system is provided for determining when a pel group in a set of bytes compares with a reference pel defining group. For the, or each, pair of maps, the compare system compares all bits of the two bytes of data with the associated bit of the reference group to provide outputs when a corresponding bit in each of the bytes compares with the two reference bits. When more than two maps are employed the compare outputs related to all of the pairs of maps are combined to provide an output signal when a pel group in a byte from the maps compares with the reference bits. In a modification of the system the comparison can be made between one or more of the maps and the corresponding bit or bits of the compare data.
457027
Kummer David A.
Saenz Jesus A.
Trynosky Stephen W.
Barrett B.p.
International Business Machines Corporation
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