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Under-screen optical sensor module for on-screen fingerprint sensing implementing imaging lens, extra illumination or optical collimator array

  • US 10,410,037 B2
  • Filed: 06/07/2017
  • Issued: 09/10/2019
  • 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;

    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 that terminate received light and generate from terminated received light electrical sensor signals containing image information of a fingerprint; and

    one or more extra illumination light sources placed below the display panel and near the optical sensor module to provide illumination probe light to illuminate a sensing area on the top transparent layer to cause returned probe light from the sensing area to the optical sensor module for optically sensing a touch by the optical sensor module without turning on the light emitting display pixels of the display panel to save power, and to provide additional illumination to the sensing area when the light emitting display pixels of the display panel are turned on to enhance optical sensing sensitivity of optical sensing at the optical sensor module.

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