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Touch-sensitive system and method for controlling the operation thereof

  • US 8,686,974 B2
  • Filed: 09/01/2010
  • Issued: 04/01/2014
  • Est. Priority Date: 09/02/2009
  • Status: Active Grant
First Claim
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1. A touch-sensitive system comprising:

  • a light transmissive panel defining a touch surface and an opposite surface;

    an illumination arrangement including emitters configured to introduce light into the panel for propagation in the panel in an emission pattern;

    a light detection arrangement including detectors configured to receive the light propagating in the panel; and

    a control unit for controlling the illumination arrangement,wherein the control unit includes a mode selector configured to,monitor the light received in the light detection arrangement to detect one or more touches on the touch surface, said one or more touches attenuating the light propagating in the panel, andselect a mode for the emission pattern in dependence of the occurrence of touches on the touch surface,wherein the control unit is configured to control the emission pattern in accordance with the selected mode, andwherein the control unit is configured to control the emission pattern by changing at least one of the number of active emitters in the illumination arrangement and the intensity of the light emitted by the emitters.

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