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Hybrid force sensitive touch devices

  • US 9,329,719 B2
  • Filed: 06/11/2013
  • Issued: 05/03/2016
  • Est. Priority Date: 03/15/2007
  • Status: Active Grant
First Claim
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1. A touch-sensitive display assembly adapted to calculate coordinates of a touch in a coordinate plane as well as a force of the touch along a z-axis, the touch-sensitive display assembly comprising:

  • a housing;

    a frame coupled to the housing;

    a touch display screen in the housing and exposed through the frame, the touch display screen adapted to calculate coordinates of the touch in a coordinate plane using one or more sensors;

    a support structure underlying the touch display screen;

    at least one force sensor underlying the support structure, the at least one force sensor adapted to determine a force of the touch perpendicular to the coordinate plane; and

    a control system comprising a non-transitory computer memory for storing instructions for;

    determining the coordinates of the touch in the coordinate plane from the touch display screen;

    determining a force component of the touch perpendicular to the coordinate plane from the force sensor;

    subdividing an area of the touch display screen into a plurality of concentric areas; and

    computing an absolute touch pressure at the determined coordinates in the coordinate plane by compensating the force component as a function of the predefined concentric area within which the touch occurred.

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