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Multi-fingerprint biometrics Organic photodiodes make full surface area biometric identification possible for high security smartphones
Thin film multi-fingerprint optical sensor is able to detect prints across the entire surface of a smartphone screen
B
iometric fingerprint sensors have suf- fered since their beginnings, often criti- cised for having so tight a tolerance to
prevent false positives that they are unusable or so loose that they lose their security advan- tage because of high levels of false positives. Striking the right balance is hard and even
low security applications like booking into the gym often require two or three attempts be- fore the fingerprint is recognised. Now, French biometrics company Isorg be-
lieves it has the answer in the form of a large- area multi-fingerprint sensor that can operate over the entire screen of a smartphone and can be used for high security banking trans- actions and access control applications. Its usability is yet to be seen but the com-
pany believes that its optical sensors on pro- prietary organic photodiode technology can provide both usability with high security. Isorg’s large-area image sensors are built
into organic photodiodes printed on a TFT (thin film transistor) backplane, converting substrates such as plastic, glass or CMOS, into an optical sensing surfaces. The surface thick- ness is less than 300μm so can be integrated with smartphone screen technology.
36 /// DAQ, Sensors & Instrumentation \\\ 2021
The sensor targets smartphone apps and
wearables requiring high-security authenti- cation for banking, personal health monitor- ing, medical file privacy, remote home control, password wallets and access control. As biometric technology continues to ad-
vance to levels where it becomes robust as well as tolerably usable, the dilemma of user acceptance levels threatens to become deeper. Fingerprint recognition has the very attractive proposition of delivering simple multi-factor authentication with high trans- actional security as well as a single replace- ment for cumbersome passwords or even a wallet full of loyalty cards. Despite that attractiveness, there are deep-
seated concerns about privacy, surveillance and the notion of personal intrusion at the thought of sharing personal attributes along the wires of corporate security systems. Still, sensor technology advances and bio- metrics are becoming more common in peo- ples’ daily lives. According to Industry Arc, the fingerprint sensor market will grow by 14 per cent compound annual growth rate over the next five years, so the industry is certainly op- timistic about user take-up. DS&I
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