Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1989-01-30
1992-02-25
Brier, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340734, 395131, 395157, G09G 514
Patent
active
050917200
ABSTRACT:
In a display system having a palette for chrominance and/or luminance information, a display buffer for information defining the pixels of a display field, including index values for indexing the palette 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 colors 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 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 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 comparison is positive.
REFERENCES:
patent: 4484187 (1984-11-01), Brown et al.
patent: 4509043 (1985-04-01), Mossaides
patent: 4642790 (1987-02-01), Minshull et al.
patent: 4794386 (1988-12-01), Bedrij et al.
patent: 4876533 (1989-10-01), Barkins
IBM Technical Disclosure Bulletin, "Color Display Window Control", vol. 29 No. 6 Nov. 1986 pp. 2526 and 2527.
IBM Technical Disclosure Bulletin, "Clipping and Windowing with Graphics Display", vol. 28 No. 8 Jan. 1986 pp. 3276 and 3277.
IBM Personal System/2 Display Adapter 8514/A Technical Reference Manual Apr. 2, 1987 pp. 2-87 and 2-88.
Brier Jeffery A.
Clark George E.
International Business Machines - Corporation
Walker Mark S.
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