G - Physics – 09 – G
Patent
G - Physics
09
G
375/4
G09G 1/00 (2006.01) G09G 5/06 (2006.01) G09G 5/14 (2006.01)
Patent
CA 1328513
ABSTRACT DISPLAY SYSTEM COMPRISING A WINDOWING MECHANISM In a display system having a palette 38 for chrominance and/or luminance information, a display buffer 36 for information defining the pixels of a display field, including index values for indexing the palette to select the chrominance and/or luminance of the pixels, a windowing mechanism is provided for associating a different range of index values with each of a plurality of windows and for responding to index values stored at individual pixel positions in the display buffer to determine the visible extent of a given window within the display field. This allows a plurality of windows to be displayed with a minimum of extra logic and without unduly constraining the choice of colours available within those windows. In the described embodiment, windows are defined in a first phase by storing index values from the range of values associated with that window at all pixel positions for that window. Then, in a second phase, the output of a range comparator 46 for comparing index values stored in the display buffer to the range of values associated with a given window is used to control multiplexer means 60 to cause an item of update information destined for a particular pixel position to be stored at that pixel position in the display buffer only if the compa- rison is positive.
588444
International Business Machines Corporation
Saunders Raymond H.
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