AC line multiplexing for a multi-digit display system

Details AC line multiplexing for a multi-digit display system AC line multiplexing for a multi-digit display system

1975-08-04

1977-01-25

Griffin, Robert L.

H04B 116

Patent

active

040053695

ABSTRACT:
A two digit display system includes an AC line operated transformer with a center tapped secondary supplying a pair of diodes to produce half wave rectified voltages 180.degree. out-of-phase for alternately activating two 7-segment digital display devices. One half wave voltage is reshaped and supplied to a multiplexing circuit for alternately supplying, in synchronism with the corresponding display device activation, BCD information from separate tens and units storage devices to a single decoder-driver for conversion of the BCD information into digital information for display.

REFERENCES:
patent: 3699763 (1972-10-01), Zeph
patent: 3728714 (1973-04-01), Kolesar
patent: 3813575 (1974-05-01), Webb
patent: 3835424 (1974-09-01), Marik
patent: 3846707 (1974-11-01), Sakamoto
patent: 3851254 (1974-11-01), Merrell et al.
patent: 3867619 (1975-02-01), Arauchi
patent: 3906345 (1975-09-01), Bertolasi

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