Electronic watch

Details Electronic watch Electronic watch

1978-02-23

1981-03-10

Weldon, Ulysses

Horology: time measuring systems or devices

Chronological

With electro-optical display

368 82, 368239, 368242, 340784, 340752, G04C 1900

Patent

active

042558042

ABSTRACT:
An electronic watch adapting a matrix drive display system. An electronic watch comprises a single voltage level power source serving as the energy source for a circuit of the watch, a matrix drive type liquid crystal display device providing digital indications of times by means of line and column electrodes, a crystal oscillator producing a time reference signal, a frequency divider circuit dividing said time reference signal into time unit signals, a time keeping counter counting the time unit signals to provide a time keeping signal, matrix drive circuit means converting said time keeping signal into drive signals for said line and column electrodes and pitch measurement signal transmission means act on the matrix drive circuit means to momentarily supply at least some of the wave forms of outputs of the time line and column electrode drive signals.

REFERENCES:
patent: 3937049 (1976-02-01), Murakami et al.
patent: 3946591 (1976-03-01), Yanagawa et al.
patent: 3998044 (1976-12-01), Yamanchi et al.
patent: 4044546 (1977-08-01), Koike
patent: 4106283 (1978-08-01), Yamashita

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