Electronic timepiece having illumination level

Details Electronic timepiece having illumination level Electronic timepiece having illumination level

1982-09-15

1984-01-03

Truhe, J. V.

Horology: time measuring systems or devices

Chronological

With intensity control of display

368 34, 368 62, G04B 1922, G04B 1924

Patent

active

044239637

ABSTRACT:
An electronic timepiece is provided with a photo-electric cell generating an output voltage indicative of incident illumination levels, circuit means for converting this output voltage into digital data signals, and a liquid crystal display which is driven in response to the data signals such that successive sections of the display act to progressively unmask a rear reflector plate to thereby indicate the illumination level. The circuits for converting illumination level to data signals are based on an oscillator circuit whose frequency is controlled by the photo-electric cell voltage, and digital means for measuring this frequency, so that the circuit configuration is very simple and power comsumption extremely low.

REFERENCES:
patent: 4095405 (1978-06-01), Tanaka
patent: 4312056 (1982-01-01), Nishimura

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