PATENT COVER GRAPHIC


United States Patent 3,815,354
June 11, 1974

Electric Watch
Richard L. Strocka
David F. Broxterman


Filed January 2, 1973
Image of US PATENT 3,815,354

Abstract of the Disclosure

A low cost electronic time keeping and display system comprising a regulated voltage converter for converting a low voltage from a source to a relatively high voltage, an electronic time keeping system powered by the low voltage source for providing low voltage time signals, and a plurality of level converters powered by the high voltage for converting each of the low voltage time signals to a relatively high voltage of sufficient magnitude to operate an associated relatively high voltage display. The regulated voltage converter periodically samples the relatively high voltage with a short duty cycle to minimize current consumption. Each level converter has a complementary configuration which consumes current only during an extremely short switching cycle. A single chip CMOS design, low voltage and current requirements and compatibility with liquid crystal display make the invention ideal for use in a watch environment.
Figure descriptions: cover graphic

  • a system diagram of the preferred embodiment of the invention.

 Citations [54]:
  
3,258,906 07/1966 Demby 3,715,881 02/1973 Girard
National Museum of American History
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