Drive circuit of light emitting means for liquid crystal electro

Details Drive circuit of light emitting means for liquid crystal electro Drive circuit of light emitting means for liquid crystal electro

1976-08-31

1977-10-04

Weldon, Ulysses

58 23BA, G04B 1934

Patent

active

040516644

ABSTRACT:
Light emitting means for illuminating the liquid crystal display of an electronic watch is energized by alternating current rather than direct. The alternating current is supplied by an AND circuit having one input connected to a terminal of the battery which powers the watch and another input connected to an output of selected frequency of the usual frequency divider of the watch. The output of the AND circuit is amplified by a buffer amplifier having a current gain element and the amplified output is fed to a transistor driver for the light emitting means which may be a lamp or a light emitting diode. The use of alternating current lessens the drain on the battery and thereby prolongs battery life.

REFERENCES:
patent: 3855784 (1974-12-01), Foellner
patent: 3898790 (1975-08-01), Takamune et al.
patent: 3911665 (1975-10-01), Van Berkum
patent: 3962859 (1976-06-01), Ito

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