Character generator for video display

Details Character generator for video display Character generator for video display

1977-05-26

1979-03-27

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340723, G06K 1520

Patent

active

041468775

ABSTRACT:
A video display device generates a plurality of character rows having a total height of ten lines containing a plurality of characters constructed of a seven dot wide, eight dot high matrix. A read-only memory for the character generator stores eight-bit signals for each character. The ROM receives a signal from a line-within-a-row counter and the least three significant bits of a four-bit character code to output the pertinent eight-bit signal. Seven bits of the signal are provided in parallel to a parallel/serial converter which causes them to be outputted to the video display sequentially as the dot time signal changes. The eighth bit of the code as well as the most significant bit of the character code are provided to a logic circuit which clears the parallel/serial converter during the generation of two of the ten lines of a row. The remaining eight matrix lines are accordingly selectively positioned within the ten of the row height allowing clearance between the descenders of the lower case letters and the tops of the upper case letters on the next succeeding row.

REFERENCES:
patent: 3868672 (1975-02-01), Johnson
patent: 3877007 (1975-04-01), Fishman
patent: 3918040 (1975-11-01), Beuter et al.
patent: 3952296 (1976-04-01), Bates
patent: 3976990 (1976-08-01), Haak

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