A sweep-type fingerprint sensor module includes a microprocessor and a
sweep-type fingerprint sensor, which includes a substrate, and a sensing
members array, a speed-detecting unit, and a processing circuit on the
substrate. The array is composed of plural fingerprint sensing members.
When the finger sweeps across the fingerprint sensor, the array
sequentially acquires plural fingerprint fragment images from the finger
with a sampling time interval. The speed-detecting unit is composed of
first and second plate electrodes. The processing circuit processes and
then outputs signals from the array and the speed-detecting unit. The
microprocessor electrically connected to the processing circuit derives a
sweeping speed of the finger by the time difference when the finger
sweeps across the sensor surface and sequentially contacts the first and
second plate electrodes, determines the sampling time interval and
minimize the number of captured fragment images for re-construction of
the initial complete fingerprint image.