Integrated Framework for Touch and Fingerprint Sensing: A Unified and an In-Cell Approach



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In today's technology-driven world, it is essential to build secure systems with low faulty behavior. Authentication is one of the primary means to gain access to secure systems. Users need to be authenticated in order to gain access to the services and sensitive information contained within the system. Due to the surge in the number of touch-based smart devices, there arises a need for a compatible authentication system. Historically, fingerprints have served in its fullest capacity to establish the uniqueness of an individual's identity and can be detected using capacitive sensing techniques. This thesis is the result of implementing innovative ideas that will revolutionize the way security will be perceived in the near future. This thesis presents two novel approaches using transparent electronics that can sense fingerprint scan and multi-touch gestures. A high resolution transparent touch-sensitive device and read out circuits are discussed. The readout circuit drives the capacitive sensor array for touch interactions at low resolutions and for fingerprint sensing at higher resolutions. In addition, the thesis discusses a novel In-Cell fingerprint sensor architecture that embeds the capacitive fingerprint sensor along with the display. The results are shown with the help of circuit simulation tools and custom Verilog-A model for transparent thin-film transistors. The results show that such devices can be realized and can serve as a very efficient means of user authentication. Furthermore, from the usability aspect, the proposed device is essential as it provides user transparent and non-intrusive authentication.



Touch screen, Fingerprint, Unified device, Sensors


Portions of this document appear in: Koundinya, Pranav, Sandhya Theril, Tao Feng, Varun Prakash, Jiming Bao, and Weidong Shi. "Multi resolution touch panel with built-in fingerprint sensing support." In Proceedings of the conference on Design, Automation & Test in Europe, p. 245. European Design and Automation Association, 2014. doi: 10.7873/DATE.2014.258. © 2014 IEEE. In reference to IEEE copyrighted material which is used with permission in this thesis, the IEEE does not endorse any of University of Houston's products or services. Internal or personal use of this material is permitted. If interested in reprinting/republishing IEEE copyrighted material for advertising or promotional purposes or for creating new collective works for resale or redistribution, please go to to learn how to obtain a License from RightsLink.