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Touch input devices for display/sensor screen

  • US 20080192025A1
  • Filed: 02/12/2008
  • Published: 08/14/2008
  • Est. Priority Date: 02/13/2007
  • Status: Abandoned Application
First Claim
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1. A mechanical touch input system for use with a display/sensor screen (DSS) assembly having a display output and a photosensor array, including:

  • an outer transparent layer on said display output;

    means for injecting actinic light into said outer layer at an angle to cause total internal reflection in said outer layer, said actinic light propagating along the plane of said outer layer;

    at least one mechanical touch input device adapted to be removably secured to the outer surface of said outer layer;

    said mechanical touch input device including at least one reflective pad disposed to contact said outer surface of said outer layer;

    said reflective pad including a high index of refraction at the wavelength of said actinic light, whereby said outer surface of said outer layer is made conductive to said actinic light at the location of said reflective pad, which reflects said actinic light into impingement with said photosensor array of said DSS;

    said at least one reflective pad including a recognizable distinguishing feature;

    signal processing means connected to said photosensor array to recognize said recognizable distinguishing feature and identify the respective mechanical touch input device.

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