Solid state wristwatch with charge coupled divider
AssigneeTime Computer, Inc.
InventorArthur H. O'Connor
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Abstract
This invention relates to a solid state timepiece and more particularly to an electronic watch which employs no moving parts. In the present invention a frequency standard in the form of a crystal oscillator acts through a solid state electronic circuit divider and display actuator to power in timed sequence the light-emitting diodes of an electro-optic display. Low cost, low power consumption and small size and weight are achieved through the use of a charge coupled binary divider chain.
Claims10
A wristwatch comprising a source of substantially constant frequency electrical signals, a divider coupled to the output of said source, a time display, and a display actuator coupling said divider to said display, said divider comprising a plurality of stages of charge coupled transistors, clock means coupling said source of substantially constant frequency electrical signals to each of said stages for causing a charge signal to propagate along the stages of said divider at a rate determined by the frequency of said electrical source, a complementary symmetry MOS inverter coupled between the first and last of said stages for feeding a signal which is the inverse of the state of said last stage back to said first stage, and means for coupling the output of said inverter to the input of said display actuator.
Dependencies are inferred from the claim text.