Active matrix capacitive fingerprint sensor with 1-TFT pixel architecture for display integration
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United States of America Patent
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May 1, 2018
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app pub date -
Jun 30, 2015
filing date -
Jun 30, 2015
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Abstract
Embodiments described herein include a method for operating an input device by applying a charge voltage to a sense element through a first transistor that is between the sense element and a column output line and a first switch that is between the column output line and a drive voltage. The method also includes storing an electric charge on the sense element, wherein the electric charge comprises a magnitude corresponding to a feature of an input object. The method also includes driving a gate terminal of the first transistor low and disconnecting the charge voltage via the first switch. The method further includes transferring the electric charge to a feedback capacitor.
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