Segment failure detector for digital display

Details Segment failure detector for digital display Segment failure detector for digital display

1980-04-08

1981-10-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340641, 340756, G06F 314, G09F 932

Patent

active

042976928

ABSTRACT:
A circuit for detecting failure of a segment in a digital display which includes a comparator connected to the energizing circuit for the display segments so that when a segment fails and is addressed, the comparator output is changed to provide a blanking signal which is fed by a circuit to the blanking input of the display driver for blanking the display. The energizing circuit for the display includes lamp test means, which, after display blanking, is actuated to energize all of the segments thereby permitting identification of the failed segment. Release of the lamp test means activates a timer circuit for providing an override signal for overriding the blanking signal to return the display to normal operation for a predetermined period of time following which the display will be blanked again when the failed segment is again addressed.

REFERENCES:
patent: 3548403 (1970-12-01), Johnson
patent: 3696390 (1972-10-01), Cohen
patent: 3719937 (1973-03-01), Doyle
patent: 3753226 (1973-08-01), Schnurmann et al.
patent: 3866171 (1975-02-01), Loshbough
patent: 4001808 (1977-01-01), Ebihara

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