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Detecting multitouch events in an optical touch-sensitive device using line images

  • US 9,063,615 B2
  • Filed: 04/30/2012
  • Issued: 06/23/2015
  • Est. Priority Date: 08/07/2008
  • Status: Active Grant
First Claim
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1. A method for determining simultaneous touch events on a surface, the surface having emitters and detectors arranged around its periphery, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beam, the method comprising:

  • receiving information indicating which beams have been disturbed by touch events;

    based on the received information, determining line images of the touch events from the viewpoints of the emitters and/or detectors, wherein a line image, for a given one of the detectors or emitters, is a one-dimensional image representing an analog quantity of transmittance of an optical beam between the given detector or emitter and complementary emitters or detectors optically coupled to the given detector or emitter; and

    determining the touch events based on the line images.

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