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US 3,991,552 AGranted
Digital watch with liquid crystal display
AssigneeHughes Aircraft Company
InventorsErnest C. Ho, Norman E. Moyer, Richard J. Belardi
Life of this patent
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Abstract
A digital watch system includes a crystal controlled oscillator with frequency division which controls a set of counters, each counter carrying coded horological data. Selected counter set data is multiplexed into a seven segment decoder. The decoder output is demultiplexed into memories, one for each of the segments in each of the display digits. The memories control segment drivers for the liquid crystal digital displays.
Claims5
An electronic watch structure comprising:
- a support, a plurality of liquid crystal display devices mounted upon said support, an electronic circuit mounted on said support for powering said visual display device, said support, said visual display and said electronic circuit being of such size and having such electrical characteristics that they can be carried in a wristwatch and be battery-powered;
- said electronic circuit comprising an oscillator and a divider for producing timed pulses of substantially constant period and counters for receiving said pulses and maintaining a plurality of sets of horological information;
- a first and second pushbutton connected between said counters and said liquid crystal display devices;
- and
- means for causing said liquid crystal display devices to continuously display a first set of horological information when said first and second pushbuttons are unactuated, to display a second set of horological information when said first pushbutton is actuated and a third set of horological information when said second pushbutton is actuated.
2 more elements
Dependencies are inferred from the claim text.