Booster circuit for a liquid crystal display device of a timepie

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier

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330112, G04C 300, H03F 140

Patent

active

039746364

ABSTRACT:
A booster circuit for a liquid crystal display device of a timepiece is disclosed. The booster circuit is a sort of a blocking oscillator having a transformer of which turns ratio is 1 : n (where n is a real number). The rectified output voltage of said blocking oscillator is superposed on the voltage of the cell so that the output voltage of the booster circuit is higher than of the blocking oscillator. A smoothing condenser has ample capacitance to have a larger time constant than the fluctuation time of the voltage of the cell owing to mechanical shock.

REFERENCES:
patent: 3100278 (1963-08-01), Reich
patent: 3225536 (1965-12-01), Reich
patent: 3782103 (1974-01-01), Saito

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