Digital watch with liquid crystal and sequentially read out ligh

Details Digital watch with liquid crystal and sequentially read out ligh Digital watch with liquid crystal and sequentially read out ligh

1975-05-27

1977-03-01

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340336, G04B 1934

Patent

active

040095665

ABSTRACT:
A digital watch display system with a dual display element is provided, a liquid crystal for use in daylight, or bright light, and a light emitting diode for use in dim light. The light emitting diode display causes an over drain on the battery used for the watch. In order to minimize this, instead of the usual four digit LED display, two for hours and two for minutes, only two LED display digits are used and are alternately turned on to display hours and minutes.

REFERENCES:
patent: 3576099 (1971-04-01), Walton
patent: 3668861 (1972-06-01), Mitsui
patent: 3747322 (1973-07-01), Eckenrode
patent: 3765163 (1973-10-01), Levine et al.
patent: 3911665 (1975-10-01), VAN Berkum
M. S. Robbins, "Monodigichron," Popular Electronics, Sept. 1973, pp. 35-39.

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