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Pressure-sensitive capacitive measurement device and method for touch-sensitive and contactless interfaces

  • US 10,396,784 B2
  • Filed: 12/18/2012
  • Issued: 08/27/2019
  • Est. Priority Date: 12/21/2011
  • Status: Expired due to Fees
First Claim
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1. A capacitive measurement device, comprising:

  • a support plate made from a dielectric material, with a resilient material coupled to the support plate and configured for fixing the support plate onto a display referenced to a ground potential,first active electrodes made from an electrically conductive material, arranged on a first face of said support plate opposite the display and configured to receive a first potential different from the ground potential, wherein each of a plurality of the first active electrodes formed on a central area of the support plate are configurable for individually detecting an approach or contact of one or more objects of interest,an electronic capacitive measurement amplifier configured for allowing data on the approach or contact of the one or more objects of interest to be obtained by measurements of capacitive coupling with said first active electrodes, andsecond active electrodes made from an electrically conductive material, arranged on a second face of said support plate toward the display and configured to receive a second potential, the second active electrodes selectively connectable to said electronic capacitive measurement amplifier so as to allow measurements of one or both of a displacement and deformation of said support plate to be obtained by measurement of capacitive coupling between said second active electrodes and said display,wherein the electronic capacitive measurement amplifier is configurable for receiving a guard potential at a first input,wherein the electronic capacitive measurement amplifier is selectively couplable to the first active electrodes at a second input for generating the first potential, or to the second active electrodes at the second input for generating the second potential, andwherein the first and second potentials are referenced to the guard potential through the electronic capacitive measurement amplifier.

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