Electronic time keeping system

Details Electronic time keeping system Electronic time keeping system

1975-02-05

1978-03-28

Jackmon, Edith S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

58 23A, 58 23BA, 307296A, G04B 1930, G04C 300, H03K 102

Patent

active

040807800

ABSTRACT:
An electronic timekeeping device includes bipolar integrated circuit implemented logic in combination with a liquid crystal display. The bipolar circuitry is configured to effectively implement logic functions with a supply voltage of only one volt. Drive circuitry is coupled to the liquid crystal display to effectively impress an a.c. voltage across the liquid crystal cell when display is required. The logic circuitry includes a transistor configured current source regulated to effectively maintain a current independent of source and load variations, enabling integrated circuit implementation without utilizing large value external resistors. The display circuitry includes logic for enabling display of the calendar date and time, reset capabilities independent of date increments are provided.

REFERENCES:
patent: 3617778 (1971-11-01), Korom
patent: 3738099 (1973-06-01), Tanaka
patent: 3750383 (1973-08-01), Kakizawa
patent: 3772874 (1973-11-01), Lefkowitz

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