We describe a system of electronically active inks which may include
electronically addressable contrast media, conductors, insulators,
resistors, semiconductive materials, magnetic materials, spin materials,
piezoelectric materials, optoelectronic, thermoelectric or radio
frequency materials. We further describe a printing system capable of
laying down said materials in a definite pattern. Such a system may be
used for instance to: print a flat panel display complete with onboard
drive logic; print a working logic circuit onto any of a large class of
substrates; print an electrostatic or piezoelectric motor with onboard
logic and feedback or print a working radio transmitter or receiver.