A low cost capacitive fingerprint sensor which can be fabricated on various
substrates, such as large glass or plastic substrates. The sensor is made
by depositing and patterning alternate layers of conductive and insulation
materials. A pixel of the sensor is comprised of a pick up pad and a
plurality of voltage electrodes symmetrically placed around the pick up
pad. The symmetry is such that only when a finger surface ridge is
present, the pick up pad registers a signal.
