Video display system

Details Video display system Video display system

1976-04-29

1978-02-21

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

364521, G06K 1520

Patent

active

040756203

ABSTRACT:
Television-type display system for displaying standard and non-standard characters within character locations on a television screen. A refresh memory contains digital code words which either represent a standard character such an an alphanumeric character or designate an address in a pattern memory. The pattern memory contains character image data for producing non-standard characters or symbols of any desired configuration within the confines of a character location on the television screen. The contents of the pattern memory and thus the non-standard characters which can be produced are alterable. The contents of the refresh memory are read out in order. Code words representing a standard character are applied to a ROM character generator which converts the code word to character image data for producing the standard character on the television screen. Code words designating an address in the pattern memory are applied to the pattern memory to cause character image data pertaining to the addressed non-standard character to be read out of the pattern memory for producing the non-standard character on the television screen.

REFERENCES:
patent: 3624632 (1971-11-01), Ophir
patent: 3750135 (1973-07-01), Carey et al.
patent: 3778810 (1973-12-01), Hayashi
patent: 3849773 (1974-11-01), Katahira et al.
patent: 3967268 (1976-06-01), Roberts

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