Graphics display terminal and method of storing alphanumeric dat

Details Graphics display terminal and method of storing alphanumeric dat Graphics display terminal and method of storing alphanumeric dat

1985-06-24

1988-07-12

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340734, 340747, 340748, G09G 128

Patent

active

047573090

ABSTRACT:
The specification describes a method of storing alphanumeric characters in a graphics display terminal comprising a raster-scan display device and a refresh buffer including a plurality of bit planes each having a respective bit storage location corresponding to each addressable pel position on the screen of the display device. In the method, a first bit plane stores high resolution luminance data defining alphanumeric characters each as a selection of "on" bits within a respective n.times.m array where n is the width of the character box in the scan line direction, and at least one further bit plane stores low resolution color data for the characters. The attribute plane comprises a respective n-bit set of storage locations which corresponds to each n-bit wide by one pel deep portion of a character box in the luminance plane and defines at least the color and/or intensity of the foreground and background of the character for the width of the character box in respect of a single scan line. The specification also describes a graphics display terminal in which data in the luminance and attribute planes may be selectively decoded either as alphanumeric data stored as above, or as bit-mapped graphics data.

REFERENCES:
patent: 3978470 (1976-09-01), McGuire
patent: 4206457 (1980-06-01), Weisbecker et al.
patent: 4408200 (1983-10-01), Bradley
patent: 4470042 (1984-09-01), Barnich et al.
patent: 4490797 (1984-12-01), Staggs et al.
patent: 4491832 (1985-01-01), Tanaka
patent: 4580135 (1986-04-01), Kummer et al.

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