Electronic timepiece

Details Electronic timepiece Electronic timepiece

1978-12-11

1981-07-14

Bauer, Edward S.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 368 84, 368242, G02F 1133

Patent

active

042783259

ABSTRACT:
In an electronic timepiece having a liquid crystal display and a dynamic driving circuit for producing a display driving signal having an effective driving voltage, the dynamic driving circuit is provided with a device for detecting the capacitance of the liquid crystal to sense a change in ambient temperature. The effective driving voltage of the display driving signal is adjusted in response to changes in the detecting capacitance and thereby the ambient temperature to compensate for the changes. In this way, the "on" voltage of the display is maintained above the saturation voltage and the "off" voltage of the display is maintained below the threshold voltage thereof over a wide temperature range so as to eliminate cross talk.

REFERENCES:
patent: 3705310 (1972-12-01), Wild
patent: 3921162 (1975-11-01), Fukar et al.
patent: 4057325 (1977-11-01), Kondo
patent: 4128311 (1978-12-01), Smith et al.

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