Electronic timepiece digital display drive circuit

Details Electronic timepiece digital display drive circuit Electronic timepiece digital display drive circuit

1977-02-09

1978-10-31

Jackmon, Edith S.

Communications: electrical

Land vehicle alarms or indicators

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

340336, G04C 300

Patent

active

041226615

ABSTRACT:
An electronic timepiece having detecting and control circuitry for preventing a digital display from being driven by a DC energizing signal is provided. The detecting and controlling circuitry is coupled intermediate the decoder circuitry and driving circuitry in an electronic timepiece digital display arrangement and detects the presence or absence of an intermediate frequency signal being produced by the timekeeping circuitry and applied to the driver circuitry to effect AC driving of the digital display. In response to detecting the absence of an intermediate frequency signal applied to the driver circuitry, the detecting and controlling circuit prevents the decoder circuitry from applying to the driver circuitry decoded timekeeping signals for effecting driving of the digital display, and thereby prevents inadvertent DC driving of the digital display.

REFERENCES:
patent: 3701249 (1972-10-01), Bergey et al.
patent: 3845615 (1974-11-01), Cake
patent: 3912977 (1975-10-01), Fillmore
patent: 3947721 (1976-03-01), Suenami et al.
patent: 4011002 (1977-03-01), Ebihara et al.

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