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OPTICAL COLLIMATORS FOR UNDER-SCREEN OPTICAL SENSOR MODULE FOR ON-SCREEN FINGERPRINT SENSING

  • US 20170270342A1
  • Filed: 06/07/2017
  • Published: 09/21/2017
  • Est. Priority Date: 06/18/2015
  • Status: Active Grant
First Claim
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1. An electronic device capable of detecting a fingerprint by optical sensing, comprising:

  • a display panel that includes light emitting display pixels, each pixel operable to emit light for forming a portion of a display image;

    a top transparent layer formed over the display panel as an interface for being touched by a user and for transmitting the light from the display panel to display images; and

    an optical sensor module located below the display panel to receive light that is emitted by at least a portion of the light emitting display pixels and is returned from the top transparent layer to detect a fingerprint, the optical sensor module including an optical sensor array of optical detectors and an array of optical collimators located between the display panel and the optical sensor array to collect the returned light from the display panel and to separate light from different locations in the top transparent layer while directing the collected returned light to the optical sensor array, wherein the array of optical collimators is spaced from the optical sensor array to effectuate a pinhole camera effect that enhances an optical imaging resolution of the optical sensor array.

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