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Fingerprint sensors

  • US 9,536,129 B2
  • Filed: 01/21/2016
  • Issued: 01/03/2017
  • Est. Priority Date: 05/17/2011
  • Status: Active Grant
First Claim
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1. A sensor for detecting one or more fingerprints comprising:

  • a first substrate and a second substrate;

    a two-dimensional array of sensing elements between said first substrate and said second substrate, wherein said sensing elements of said array are at least light sensing elements;

    a plurality of thin-film transistors for controlling said sensing elements; and

    a plurality of light sources which actively generates light being disposed between said first substrate and said second substrate distributed at locations among said array of said light sensing elements for transmitting illumination via said second substrate, in which said light sensing elements detect reflected illumination representative of one or more fingerprints via said second substrate, wherein each of said light sources comprises at least one of a diffractive element or a Fresnel element between the light source and said second substrate for shaping light from the light source without any TIR between the light source and said at least one of a diffractive element or a Fresnel element.

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