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Under-screen optical sensor module for on-screen fingerprint sensing

  • US 10,410,036 B2
  • Filed: 01/31/2017
  • 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 device screen that provides touch sensing operations and includes a display panel structure having 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 device screen as an interface for being touched by a user for the touch sensing operations and for transmitting the light from the display structure to display images to a user;

    an optical sensor module located below the display panel structure to receive light that is emitted by at least a portion of the light emitting display pixels of the display structure and is returned from the top transparent layer to detect a fingerprint;

    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; and

    a device electronic control module coupled to control the one or more extra illumination light sources to produce the illumination probe light as pulsed probe light at a pulse duty cycle, and further coupled to the optical sensor module to detect light at the pulse duty cycle to determine whether there is a touch on the top transparent layer before turning on the light emitting display pixels of the display panel structure.

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