MULTI-SIDED CARD HAVING A RESISTIVE FINGERPRINT IMAGING ARRAY

摘要

Embodiments of the present invention provide an adaptive and intelligent fingerprint scanning device and approach for a multi-sided card. Specifically, embodiments of the present invention utilize DC resistive image scanning to reduce overall scanning time and energy consumption (e.g., by identifying a targeted scanning area). In a typical embodiment, a scanning device will be provided that includes a scanning area comprised of a set (e.g., at least one) of imaging pixel electrodes (e.g., arranged adjacent to one another in a grid-like or other fashion). As a user presses his/her finger against the scanning area, a first portion of the finger will contact a first electrode while a second portion of the finger will contact a second electrode. When this occurs, a voltage source of the device will apply an initial voltage across the first and second finger portions. A meter of the device will take an electrical measurement (e.g., resistance and/or charged skin voltage) across the two finger portions. Based on the electrical measurement, a location of the finger on the device will be identified, and the fingerprint will be scanned accordingly. Thus, the entire scanning surface need not be scanned, only the portions thereof where the finger was detected.

主权项

1. 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 an initial voltage;a meter coupled to the set of imaging pixel electrodes for taking an electrical measurement across a first imaging pixel electrode and a second imaging pixel electrode of the set of imaging pixel; anda scanning area; wherein each of the first scanning device and the second scanning device is configured to: detect a location of the scanning area unsearched for a finger positioned thereon; detect the finger positioned on the scanning area, the detecting comprising:
applying an initial voltage by the voltage source to a first imaging pixel electrode of the set of imaging pixel electrodes, the first imaging pixel electrode being in contact with a first portion of the finger,determine an electrical measurement across the first imaging pixel electrode and a second imaging pixel electrode of the set of imaging pixel electrodes in response to the applying of the initial voltage, the second imaging pixel electrode being in contact with a second portion of the finger,determine, based on the electrical measurement, a region on the scanning area where the finger is placed, andscan a fingerprint from the finger only at the determined region.