Transparent and flexible fingerprint sensor array with multiplexed detection of tactile pressure and skin temperature

We developed a transparent and flexible, capacitive fingerprint sensor array with multiplexed, simultaneous detection of tactile pressure and finger skin temperature for mobile smart devices. In our approach, networks of hybrid nanostructures using ultra-long metal nanofibers and finer nanowires were formed as transparent, flexible electrodes of a multifunctional sensor array. These sensors exhibited excellent optoelectronic properties and outstanding reliability against mechanical bending. This fingerprint sensor array has a high resolution with good transparency. This sensor offers a capacitance variation ~17 times better than the variation for the same sensor pattern using conventional ITO electrodes. This sensor with the hybrid electrode also operates at high frequencies with negligible degradation in its performance against various noise signals from mobile devices. Furthermore, this fingerprint sensor array can be integrated with all transparent forms of tactile pressure sensors and skin temperature sensors, to enable the detection of a finger pressing on the display.Next-generation mobile security devices require fingerprint sensors that can be incorporated directly into the display. Here, Park et al. demonstrate a highly transparent, multifunctional capacitive fingerprint sensor array that simultaneously detects tactile pressure and finger skin temperature.

[1]  Lawrence O'Gorman,et al.  Innovations in fingerprint capture devices , 2003, Pattern Recognit..

[2]  Hakil Kim,et al.  A Study on Performance Evaluation of Fingerprint Sensors , 2003, AVBPA.

[3]  A. Iwata,et al.  A capacitive fingerprint sensor chip using low-temperature poly-Si TFTs on a glass substrate and a novel and unique sensing method , 2003, IEEE J. Solid State Circuits.

[4]  Anil K. Jain,et al.  Biometric technology for human identification , 2004 .

[5]  F. Alonso-Fernandez,et al.  Comparison of fingerprint quality measures using an optical and a capacitive sensor , 2007, 2007 First IEEE International Conference on Biometrics: Theory, Applications, and Systems.

[6]  Jin-Moon Nam,et al.  Design and implementation of a capacitive fingerprint sensor circuit in CMOS technology , 2007 .

[7]  Arun Ross,et al.  Biometric Technology for Human Identification IV , 2007 .

[8]  Jiangyu Li,et al.  Comparison of the effective conductivity between composites reinforced by graphene nanosheets and carbon nanotubes , 2008 .

[9]  Yasuhiro Koshimoto,et al.  Characteristics of thermal-type fingerprint sensor , 2008, SPIE Defense + Commercial Sensing.

[10]  M. Sepasian,et al.  Review of finger print sensing technologies , 2008, 2008 IEEE International Multitopic Conference.

[11]  Gian Luca Marcialis,et al.  Performance of fingerprint quality measures depending on sensor technology , 2008, J. Electronic Imaging.

[12]  Satoshi Miyaguchi,et al.  Optically transparent wood-cellulose nanocomposite as a base substrate for flexible organic light-emitting diode displays , 2009 .

[13]  Den Dolech,et al.  Improved pores detection in fingerprints by applying ring led's (525 nm) , 2010 .

[14]  E. J. Busselaar.  Improved pores detection in fingerprints by applying ring led's (525 nm) , 2010 .

[15]  Gary Barrett,et al.  Projected‐Capacitive Touch Technology , 2010 .

[16]  J. Zunino,et al.  Temperature-dependent electrical properties of graphene inkjet-printed on flexible materials. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[17]  Quan Pan,et al.  A performance study of layout and Vt options for low noise amplifier design in 65-nm CMOS , 2012, 2012 IEEE Radio Frequency Integrated Circuits Symposium.

[18]  Liangbing Hu,et al.  Highly transparent and writable wood all-cellulose hybrid nanostructured paper , 2013 .

[19]  Maurizio Valle,et al.  Tactile Sensing Technologies , 2013 .

[20]  Yi Xie,et al.  Ultrathin two-dimensional MnO2/graphene hybrid nanostructures for high-performance, flexible planar supercapacitors. , 2013, Nano letters.

[21]  Byeong Wan An,et al.  Stretchable and transparent electrodes using hybrid structures of graphene-metal nanotrough networks with high performances and ultimate uniformity. , 2014, Nano letters.

[22]  Pooi See Lee,et al.  Highly Stretchable Piezoresistive Graphene–Nanocellulose Nanopaper for Strain Sensors , 2014, Advanced materials.

[23]  Jian Zhou,et al.  The temperature-dependent microstructure of PEDOT/PSS films: insights from morphological, mechanical and electrical analyses , 2014 .

[24]  Holly Gu,et al.  Capacitive Touch Hardware Design Guide , 2015 .

[25]  Pooi See Lee,et al.  Foldable Electrochromics Enabled by Nanopaper Transfer Method , 2015 .

[26]  Yaping Zang,et al.  Advances of flexible pressure sensors toward artificial intelligence and health care applications , 2015 .

[27]  Weidong Zhou,et al.  High-performance green flexible electronics based on biodegradable cellulose nanofibril paper , 2015, Nature Communications.

[28]  Zhenqiang Ma,et al.  Cellulose nanofibril/reduced graphene oxide/carbon nanotube hybrid aerogels for highly flexible and all-solid-state supercapacitors. , 2015, ACS applied materials & interfaces.

[29]  Jang‐Ung Park,et al.  Fully-integrated, bezel-less transistor arrays using reversibly foldable interconnects and stretchable origami substrates. , 2016, Nanoscale.

[30]  Kukjoo Kim,et al.  Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics , 2016 .

[31]  H. Mi,et al.  High-performance flexible piezoelectric nanogenerators consisting of porous cellulose nanofibril (CNF)/poly(dimethylsiloxane) (PDMS) aerogel films , 2016 .

[32]  Kukjoo Kim,et al.  Stretchable, Transparent Electrodes as Wearable Heaters Using Nanotrough Networks of Metallic Glasses with Superior Mechanical Properties and Thermal Stability. , 2016, Nano letters.

[33]  Olfa Kanoun,et al.  Electrical properties of multi-walled carbon nanotubes/PEDOT:PSS nanocomposites thin films under temperature and humidity effects , 2016 .

[34]  Franklin Bien,et al.  On-Display Transparent Half-Diamond Pattern Capacitive Fingerprint Sensor Compatible With AMOLED Display , 2016, IEEE Sensors Journal.

[35]  Stuart R. Thomas,et al.  Recent developments in the synthesis of nanostructured chalcopyrite materials and their applications: a review , 2016 .

[36]  Woon Hyung Cheong,et al.  Rapid production of large-area, transparent and stretchable electrodes using metal nanofibers as wirelessly operated wearable heaters , 2017 .

[37]  Jang‐Ung Park,et al.  High Dielectric Performances of Flexible and Transparent Cellulose Hybrid Films Controlled by Multidimensional Metal Nanostructures , 2017, Advanced materials.

[38]  Byong-Guk Park,et al.  Integrated arrays of air-dielectric graphene transistors as transparent active-matrix pressure sensors for wide pressure ranges , 2017, Nature Communications.

[39]  Bongkyun Jang,et al.  Graphene-Based Three-Dimensional Capacitive Touch Sensor for Wearable Electronics. , 2017, ACS nano.

[40]  B. Boser,et al.  Ultrasonic Fingerprint Sensor With Transmit Beamforming Based on a PMUT Array Bonded to CMOS Circuitry , 2017, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control.

[41]  Xiao Yang,et al.  Mesh electronics: a new paradigm for tissue-like brain probes , 2018, Current Opinion in Neurobiology.

[42]  A review , 2019 .