Under-LCD screen optical sensor module for on-screen fingerprint sensing
First Claim
Patent Images
1. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
- a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images;
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; and
an optical sensor module located below the display panel structure to receive probe light that passes through the LCD screen to detect a fingerprint,wherein the LCD display panel structure includes a selected region that is located above the optical sensor module and is structured differently from other regions in the LCD display panel structure so as to transmit more probe light than the other regions in the LCD display panel structure to increase an amount of the received probe light at the optical sensor module.
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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 a LCD display screen for displaying images and that is reflected back by the top surface of the screen assembly.
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Citations
42 Claims
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1. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images; 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; and an optical sensor module located below the display panel structure to receive probe light that passes through the LCD screen to detect a fingerprint, wherein the LCD display panel structure includes a selected region that is located above the optical sensor module and is structured differently from other regions in the LCD display panel structure so as to transmit more probe light than the other regions in the LCD display panel structure to increase an amount of the received probe light at the optical sensor module. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24, 25, 26, 27)
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7. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images; 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, the top transparent layer includes a designated fingerprint sensing area for fingerprint sensing in addition for viewing the images by the LCD display panel structure; an optical sensor module located below the display panel structure to receive probe light that passes through the LCD screen to detect a fingerprint; LCD illumination light sources to provide backlighting to the LCD display panel structure for displaying images; one or more probe light sources formed under the LCD display panel structure to project the probe light to pass through the LCD display panel structure and configured to illuminate the designated fingerprint sensing area to be visibly different from a surrounding area and other areas of the top transparent layer and to further illuminate an object or finger on top of or in touch with the designate fingerprint sensing area of the top transparent layer above the LCD display panel structure to cause reflected probe light from the illuminated object or finger towards the optical sensor module for optical fingerprint sensing; and a device electronic control module coupled to the display panel structure to supply power to the one or more probe light sources and to control the LCD illumination light sources and the backlighting to the LCD display panel structure, and to turn on the one or more probe light sources to illuminate the designated fingerprint sensing area while turning off the LCD illumination light sources for the backlighting to the LCD display panel structure in a sleep mode, and wherein the device electronic control module is configured to wake up the LCD display panel structure from the sleep mode by turning on the LCD illumination light sources to provide the backlighting to the LCD display panel structure when the optical sensor module detects the presence of a person'"'"'s skin at the designated fingerprint sensing region of the top transparent layer under illumination by the one or more probe light sources only. - View Dependent Claims (8, 9)
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22. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images; 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; and an optical sensor module located below the display panel structure to receive probe light that passes through the LCD screen to detect a fingerprint, wherein the optical sensor module includes an optical collimator array of optical collimators that receives the probe light and an optical sensor array of optical sensors to receive the probe light from the optical collimator array, wherein; the optical collimators include a micro lens array of micro lenses and each micro lens focus received light without imaging the received light, the optical sensor module includes an array of optical filters that are spatially arranged to match the micro lenses of the micro lens array, one optical filter per one micro lens, and the optical filters filter the light that reaches the optical sensor array. - View Dependent Claims (23)
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28. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images; a LCD backlighting light module coupled to the LCD screen to produce backlighting light to the LCD screen for display images; 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 LCD display panel structure to receive probe light that is reflected from the top transparent layer and passes through the LCD screen to detect a fingerprint; one or more probe light sources, separate from the LCD backlighting light module, located under the LCD display panel structure, to produce the probe light that passes through the LCD display panel structure to illuminate a designated fingerprint sensing area on the a top transparent layer to be visibly different from a surrounding area of the top transparent layer for a user to place a finger for optical fingerprint sensing; and a device control module coupled to the optical sensor module to process an output of the optical sensor module to determine whether a detected fingerprint by the optical sensor module matches a fingerprint an authorized user, in addition to detecting fingerprints, also detect a biometric parameter different form a fingerprint by optical sensing to indicate whether a touch at the top transparent layer associated with a detected fingerprint is from a live person. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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a liquid crystal display (LCD) screen that provides touch sensing operations and includes a LCD display panel structure to display images; a LCD backlighting light module coupled to the LCD screen to produce backlighting light to the LCD screen to display images; a top transparent layer formed over the LCD 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 LCD panel structure to receive light returned from the top transparent layer to detect a fingerprint, wherein the optical sensor module includes a transparent block in contact with the display panel substrate to receive the light from the display panel structure, an optical sensor array that receives the light and an optical imaging module that images the received light in the transparent block onto the optical sensor array; and one or more probe light sources, separate from the LCD backlighting light module, located under the LCD display panel structure, to produce the probe light that passes through the LCD display panel structure to illuminate a designated fingerprint sensing area on the a top transparent layer to be visibly different from a surrounding area of the top transparent layer for a user to place a finger for optical fingerprint sensing. - View Dependent Claims (42)
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Specification