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Capacitive imaging device with active pixels and method

  • US 10,101,373 B2
  • Filed: 04/21/2014
  • Issued: 10/16/2018
  • Est. Priority Date: 04/21/2014
  • Status: Active Grant
First Claim
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1. A capacitive image pixel, comprising:

  • a two-transistor configuration, comprising;

    a source follower transistor having an input impedance and an output impedance that is a function of the input impedance, anda pixel selection transistor arranged to activate the source follower transistor; and

    an insulator layer arranged with respect to the source follower transistor so that an object contacting or near the insulator layer provides a variable capacitance that affects the input impedance of the source follower transistor,wherein the source follower transistor is configured to be interrogated by an AC current source to determine the output impedance of the source follower, the output impedance of the source follower representative of a nearness of the object.

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