Communications: electrical – Systems – With specific power supply
Patent
1976-02-17
1978-08-22
Trafton, David L.
Communications: electrical
Systems
With specific power supply
340336, G09F 932
Patent
active
041092457
ABSTRACT:
In an electronic sign having a set of segmented character displays, programming cards are used to control which segments are illuminated. In one embodiment, each card has a printed circuit providing electrical connection from an unfiltered, rectified ac power source via a silicon controlled rectifier to those display segments for which there are corresponding contacts in the printed circuit. Plural such cards may be wired to each character display via respective SCR's with segmented trigger signals causing sequential card energization and hence message display.
In another embodiment, segment illumination data is stored in a memory and accessed sequentially and repetitively to control which characters are displayed. Similar programming cards may be used to enter into the memory data defining each message character. A set of counters control memory addressing and selective segment energization via appropriate decoder/driver circuits that receive the data from the memory and drive the display segments.
REFERENCES:
patent: 2290261 (1942-07-01), Welch
patent: 2481269 (1949-09-01), Welch
patent: 2519993 (1950-08-01), Allen
patent: 3081450 (1963-03-01), Sinninger
patent: 3555351 (1971-01-01), Sherwin et al.
patent: 3579226 (1971-05-01), Strehlow
patent: 3638217 (1972-01-01), Sutherland
patent: 3750138 (1973-07-01), Burgan et al.
Marrs Roger A.
Trafton David L.
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