High resolution dot-matrix character display

Details High resolution dot-matrix character display High resolution dot-matrix character display

1984-12-26

1987-09-29

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340744, G09G 116

Patent

active

046971777

ABSTRACT:
Resolution of a dot-matrix character display system for a CRT is enhanced by storing two bits for each dot space, thus storing qMxn bits, where M is the number of dot spaces in a row, and N is the number of rows. The clock for reading M bits of a character in a row is increased by a factor q to generate q dots per dot space, while the CRT beam is sinusoidally modulated at the clock rate. The phase and amplitude of the modulation is selected to place the q dots displayed in a dot space at maxima of the modulation within a dot space of an MxN matrix, with a vertical displacement of .+-.1/4 raster scan width of the CRT.

REFERENCES:
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patent: 3786478 (1974-01-01), King, Jr.
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patent: 4481509 (1984-11-01), Sasaki et al.
patent: 4516119 (1985-05-01), Fukuta
patent: 4544922 (1985-10-01), Watanabe et al.
patent: 4555191 (1985-11-01), Gojo

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