Graphic display system with display line scan based other than p

Details Graphic display system with display line scan based other than p Graphic display system with display line scan based other than p

1983-10-17

1986-10-14

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340749, 340750, 340789, G09G 102

Patent

active

046175644

ABSTRACT:
A graphic display system using a cathode ray tube is disclosed, which display M line segments where M is based on an integer greater than 1 selected exclusively from integers not based on powers of 2 for each raster scanning line (line scan) in response to video data from a bit mapped refresh memory. The refresh memory is divided into memory blocks which are assigned sequential addresses and each store video dot data for one line segment. The memory is organized with N memory blocks for each scanning line, where N is an integer greater than M based on an integer selected from integers generated by powers of 2. The memory blocks are addressed with M blocks addressed during the display time and (N-M) blocks addressed during the remaining time of each line scan during which the CRT is blanked. The memory addressing rate is increased to complete the addressing of (N-M) blocks during the blanking time. This refresh memory addressing avoids complex memory block address calculation and also permits horizontal scrolling by the selection of a display start address.

REFERENCES:
patent: 4435703 (1984-03-01), Hunt et al.
patent: 4468662 (1984-08-01), Tanaka
patent: 4489317 (1984-12-01), Shiga
patent: 4491834 (1985-01-01), Oguchi

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