Electronic timepiece with battery life display

Details Electronic timepiece with battery life display Electronic timepiece with battery life display

1976-07-15

1978-02-21

Witkowski, Stanley J.

Communications: electrical

Land vehicle alarms or indicators

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

58 50R, 58127R, 58152H, 340248B, 340249, G04B 1934, G04C 300

Patent

active

040745155

ABSTRACT:
In a digital electronic timepiece, at least one of the digital displays changes color to indicate that the battery is nearing exhaustion. The display is made up of two sets of display elements, for example LEDs, disposed closely adjacent alongside one another. The two sets are of different display color, eg. red and green. Circuitry responsive to battery voltage causes display elements of one set to be illuminated when the battery voltage is normal and causes display elements of the other set to be illuminated when the battery voltage drops below a predetermined value. The resulting change in color of the display indicates that the battery is approaching the end of its life.

REFERENCES:
patent: 3691755 (1972-09-01), Girard
patent: 3802182 (1974-04-01), Fujita
patent: 3898790 (1975-08-01), Takamune et al.
patent: 3962859 (1976-06-01), Ito
patent: 3984973 (1976-10-01), Ho
patent: 3991553 (1976-11-01), Bergey et al.

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