Abstract

This paper reports on an integrative approach to a fingerprint sensor for an active matrix liquid crystal display (AMLCD). By redesigning the current driver hydrogenated amorphous silicon (a-Si:H) thin-film transistor (TFT) in the display pixel and making it a dual-gate photosensitive TFT with a $\pi $ -shape channel, a fingerprint-sensor-integrated display pixel can be enabled with a potentially high sensitivity through properly biasing the TFT into the subthreshold region. We designed, fabricated and characterized the single-pixel TFT followed by the demonstration of a ${{4}} \times {{4}}$ sensor array along with capturing the first images.

© 2016 IEEE

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