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Touch panel display system with illumination and detection provided from a single edge

  • US 7,538,759 B2
  • Filed: 05/07/2004
  • Issued: 05/26/2009
  • Est. Priority Date: 05/07/2004
  • Status: Expired due to Fees
First Claim
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1. A touch panel display system, comprising:

  • a touch panel having a front surface, a rear surface, an interior volume, and a first edge and a second edge disposed on opposite sides of the touch panel;

    an energy source positioned along the first edge of the touch panel and configured to emit energy that is propagated within the interior volume of the touch panel;

    a diffusing reflector positioned along the second edge of the touch panel, in proximity to the front surface, the diffusing reflector having a reflective quality that causes at least a portion of the energy escaping from the interior volume of the touch panel in a direction to reflect across the front surface of the touch panel in various other directions; and

    at least one detector positioned along the first edge of the touch panel and configured to detect intensity levels of at least a portion of the energy that is diffusively reflected across the front surface of the touch panel.

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