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Pressure-sensitive touch panel

  • US 10,254,894 B2
  • Filed: 12/21/2016
  • Issued: 04/09/2019
  • Est. Priority Date: 12/23/2015
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a plurality of first input/output terminals for a projected capacitance touch panel, wherein the projected capacitance touch panel comprises a layer of piezoelectric material disposed between a plurality of sensing electrodes and a common electrode, wherein the layer of piezoelectric material is uniform and at least co-extensive with the plurality of sensing electrodes;

    a plurality of second input/output terminals for a capacitive touch controller;

    a plurality of separation stages, each separation stage connecting one first input/output terminal to a corresponding second input/output terminal, and each separation stage comprising a first frequency-dependent filter for filtering signals between respective first and second input/output terminals;

    at least one amplification stage, each amplification stage having at least one input and an output configured to provide an amplified signal, wherein the number of amplification stages is less than or equal to the number of the plurality of separation stages and each amplification stage input is connected to one or more of the first input/output terminals through one or more respective separation stage;

    wherein each separation stage comprises a second frequency-dependent filter for filtering signals between the respective first input/output;

    terminal and an amplification stage input;

    wherein each first frequency-dependent filter is configured to pass signals from the capacitive touch controller and each second frequency-dependent filter is configured to attenuate signals from the capacitive touch controller.

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