Digital watch with liquid crystal and light emitting diode displ

Details Digital watch with liquid crystal and light emitting diode displ Digital watch with liquid crystal and light emitting diode displ

1975-03-13

1976-10-12

Jackmon, E. S.

58 4A, 58 58, G04B 1930, G04B 1924

Patent

active

039849732

ABSTRACT:
A digital watch system with a dual display demultiplexer, a liquid crystal display for use in daylight or bright light and a light emitting diode display for use in dim light. The digital watch system includes a crystal oscillator with frequency division which controls a set of counters, each counter carrying coded horological data. Selected counter data is multiplexed into a seven segment decoder which is then demultiplexed into memories, one for each of the segments in each of the liquid crystal display digits. These memories then control segment drivers for the liquid crystal digital displays. In parallel with the liquid crystal demultipliexer, the seven segment decoder outputs operate segment and digit drivers which drive light emitting diodes as a second display for the digital watch.

REFERENCES:
patent: 3668861 (1972-06-01), Mitsui
patent: 3672155 (1972-06-01), Bergey et al.
patent: 3747322 (1973-07-01), Eckenrode et al.
patent: 3765163 (1973-10-01), Levin et al.

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