Under-screen optical sensor module for on-screen fingerprint sensing implementing imaging lens, extra illumination or optical collimator array
First Claim
Patent Images
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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Accused Products
Abstract
Devices and optical sensor modules are provided for provide on-screen optical sensing of fingerprints by using a under-screen optical sensor module that captures and detects returned light that is emitted by the display screen for displaying images and that is reflected back by the top surface of the screen assembly. Optical collimators are provided in the under-screen optical sensor module to enhance the optical imaging performance.
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Citations
48 Claims
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1. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 for optical sensing by the optical sensor array to enhance an optical imaging resolution at the optical sensing by the optical sensor array, wherein the optical sensor module further includes an optical layer between the optical collimators and the display panel to select angled probe light returned from the display panel to enter the optical collimators while reducing an amount of the returned probe light that is perpendicular to the display panel and enters the optical collimators and wherein the optical layer includes an optical diffraction pattern that diffracts the returned probe light to direct the angled probe light returned from the display panel to enter the optical collimators. - View Dependent Claims (15, 16, 17)
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18. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 for optical sensing by the optical sensor array, wherein the optical sensor module further includes an optical layer between the optical collimators and the display panel to select angled probe light returned from the display panel to enter the optical collimators while reducing an amount of the returned probe light that is perpendicular to the display panel and enters the optical collimators and wherein the optical collimators are elongated channels in a direction perpendicular to the display panel and the optical layer between the optical collimators and the display is structured to direct the angled probe light from the display panel to be substantially perpendicular to the display panel to enter the optical collimators while directing a portion of the probe light from the display panel that is perpendicular to the display panel to be away from the direction of the optical collimators. - View Dependent Claims (19, 20, 21)
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22. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 to receive light and to terminate received light to generate electrical detector signals containing image information of a fingerprint 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 for optical sensing by the optical sensor array, wherein the optical sensor module is structured to measure returned probe light at two or more different wavelengths emitted by light emitting display pixels in the display panel to compare an extinction ratio of the probe light at the two or more different wavelengths as the second signal indicative of whether the received contact is from a live person. - View Dependent Claims (23, 24, 25)
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26. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 to collect the returned light from the display panel for optical sensing of the fingerprint, wherein the optical sensor module captures different fingerprint patterns at different times to monitor time-domain evolution of the fingerprint ridge pattern deformation that indicates time-domain evolution of a press force from the contact input. - View Dependent Claims (27, 28, 29, 30)
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31. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 to capture an optical image of the fingerprint, wherein the display panel operates in a flash mode to cause a portion of the light emitting display pixels in the display panel to flash at a light emission level higher than a light emission level in displaying images to detect a presence of a finger and to obtain a fingerprint of the finger. - View Dependent Claims (32, 33, 34, 35)
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36. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 that terminate received light and generate from the terminated received light electrical detector signals containing image information of a fingerprint, 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, and an optical layer between the optical collimators and the display panel to select angled probe light returned from the display panel to enter the optical collimators while reducing an amount of the returned probe light that is perpendicular to the display panel and enters the optical collimators, wherein the optical layer includes an optical diffraction pattern that diffracts the returned probe light to direct the angled probe light returned from the display panel to enter the optical collimators. - View Dependent Claims (37, 38, 39)
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40. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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 that terminate received light and generate from the terminated received light electrical detector signals containing image information of a fingerprint, 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, and an optical layer between the optical collimators and the display panel to select angled probe light returned from the display panel to enter the optical collimators while reducing an amount of the returned probe light that is perpendicular to the display panel and enters the optical collimators, wherein the optical collimators are elongated channels in a direction perpendicular to the display panel and the optical layer between the optical collimators and the display is structured to direct the angled probe light from the display panel to be substantially perpendicular to the display panel to enter the optical collimators while directing a portion of the probe light from the display panel that is perpendicular to the display panel to be away from the direction of the optical collimators. - View Dependent Claims (41, 42, 43, 44)
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45. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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an optical sensor module to receive light that is returned from a top transparent layer of a touch sensing display panel 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 touch sensing display panel and the optical sensor array to collect the returned light from the touch sensing display panel for optical sensing by the optical sensor array to enhance an optical imaging resolution at the optical sensing of the fingerprint by the optical sensor array, wherein the optical sensor module further includes an optical layer between the optical collimators and the display panel to select angled probe light returned from the display panel to enter the optical collimators while reducing an amount of the returned probe light that is perpendicular to the display panel and enters the optical collimators and wherein the optical layer includes an optical diffraction pattern that diffracts the returned probe light to direct the angled probe light returned from the display panel to enter the optical collimators. - View Dependent Claims (46, 47, 48)
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Specification