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Optical fingerprint sensor

  • US 10,705,272 B2
  • Filed: 11/27/2017
  • Issued: 07/07/2020
  • Est. Priority Date: 02/02/2015
  • Status: Active Grant
First Claim
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1. An optical fingerprint sensor, comprising:

  • an image sensor array;

    a collimator filter layer disposed above the image sensor array, the collimator filter layer having an array of apertures, wherein the array of apertures are positioned to receive light from a light source for fingerprint imaging, and wherein sidewalls of the apertures in the array of apertures include structures to prevent light from reflecting off the sidewalls and reaching the image sensor array, wherein the structures comprise grooved surfaces; and

    a reflective layer disposed on a top surface of the collimator filter layer, wherein the reflective layer is configured to reflect and direct light towards a sensing surface.

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