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Near-field optical sensing system

  • US 9,109,949 B2
  • Filed: 03/14/2013
  • Issued: 08/18/2015
  • Est. Priority Date: 03/14/2013
  • Status: Expired due to Fees
First Claim
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1. An optical sensing system, comprising:

  • a light guiding layer having a first surface, a second surface, and one or more edges;

    an infrared (IR) light source configured to direct light into an area overlying the first surface of the light guiding layer;

    a plurality of light-turning structures configured to redirect light passing through the first surface of the light guiding layer into the light-guiding layer;

    a plurality of IR sensors adjacent at least one edge of the light-guiding layer; and

    a plurality of masking structures disposed between the light-guiding layer and the plurality of IR sensors.

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