Patent ID: 8885896

Claim:
A multi-sided card having a resistive fingerprint array, comprising: a first side having a first fingerprint scanning device; a second side having a second fingerprint scanning device, the first fingerprint scanning device and the second fingerprint scanning device each comprising: a set of imaging pixel electrodes for creating a fingerprint scanning surface; a voltage source coupled to the set of imaging pixel electrodes for supplying a first voltage to a plurality of imaging pixel electrodes for a controlled duration and supplying a second voltage to the plurality of imaging pixel electrodes for a controlled duration; a meter coupled to the set of imaging pixel electrodes for taking a first electrical measurement relating to the first voltage for the plurality of imaging pixel electrodes and taking a second electrical measurement relating to the second voltage for the plurality of imaging pixel electrodes; a controller coupled to the meter for calculating the voltage level difference between the first electrical measurement and the second electrical measurement; a memory medium for storing historical data relating to finger position on the fingerprint scanning surface; and a comparator for comparing a position of a scanned fingerprint to the historical data.