Multipoint touchscreen

  • US 10,331,259 B2
  • Filed: 09/22/2016
  • Issued: 06/25/2019
  • Est. Priority Date: 05/06/2004
  • Status: Active Grant
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First Claim
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1. A device configured to detect a pressure of each of multiple touches that occur at a same time and at distinct locations in a plane of the device and to produce pressure signals at each of the distinct locations of the multiple touches on the plane of the device, wherein the device comprises:

  • a first layer having a plurality of first conductive lines that are electrically isolated from one another, each of the plurality of first conductive lines being operatively couplable to first circuitry; and

    a second layer spatially separated from the first layer and having a plurality of second conductive lines that are electrically isolated from one another, the plurality of second conductive lines being positioned transverse to the plurality of first conductive lines, the intersection of transverse lines being positioned at different locations in the plane of the device, each of the plurality of second conductive lines being operatively coupled to second circuitry that determines the pressure of each of the multiple touches that occur at the same time and at the distinct locations in the plane of the device and tracks each of the multiple touches that occur at the same time and at the distinct locations in the plane of the device;

    wherein the first circuitry is configured to stimulate the plurality of first conductive lines;

    wherein the second circuitry is configured to detect charge coupling events that occur between the plurality of first conductive lines and the plurality of second conductive lines when the first circuitry is stimulating one or more of the plurality of first conductive lines, andwherein the charge coupling between the plurality of first conductive lines and the plurality of second conductive lines produces the pressure signals at each of the distinct locations of the multiple touches on the plane of the device.

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