Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-11-28
1990-09-11
Brier, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340798, G09G 102
Patent
active
049566407
ABSTRACT:
This invention provides a method and apparatus for controlling the type of information displayed at each display pixel on the video monitor of a video display system. A number of video RAMs are provided which number is at least equal to the number of different types of information. A bitmap is stored for each type of information in the video RAMs in interspersed fashion, a selected number of bits for select display pixels of the bitmap for a given type of information being simultaneously stored in said RAMs, followed for each RAM by the selected number of bits for the same selected display pixels for the bitmap of at least one other information type. No more than one bitmap bit for a given display pixel is stored in any video RAM. The addressing of the RAMs for read out of the bitmap is shifted so that bits for the same display pixels for all of the bitmaps are simultaneously read out from the RAMs. The bits of the bitmaps for each display pixel are then prioritized, the prioritizing including determining and generating an indication of the type of information which has priorty and is to be displayed at each display pixel.
REFERENCES:
patent: 4509045 (1985-04-01), Mossaides
patent: 4562435 (1985-12-01), McDonough et al.
patent: 4691295 (1987-09-01), Erwin et al.
patent: 4745407 (1988-05-01), Costello
patent: 4773026 (1988-09-01), Takahara et al.
patent: 4782462 (1988-11-01), Kaplinsky et al.
Hempstead David C.
Jundanian Richard H.
Brier Jeffery A.
Hewlett--Packard Company
Perillo Frank R.
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