Under-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 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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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.
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Citations
32 Claims
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1. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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; 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, wherein; the display panel structure includes openings or holes between the light emitting display pixels of the display panel structure to allow the returned light to pass through the display panel structure to reach the optical sensor module; and the optical sensor module includes an optical sensor array of optical detectors that detect light to produce detector signals and an array of optical collimators to collect the returned light from the display panel structure and to separate light from different locations in the top transparent layer while directing the collected returned light to the optical sensor array. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An electronic device capable of detecting a fingerprint by optical sensing, comprising:
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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, the optical sensor module including an optical sensor array that includes an array of optical detectors to receive the returned light, and an array of optical pinholes to collect the returned light from the display panel structure and to separate light from different locations in the top transparent layer, wherein each pinhole is structured to direct collected returned light to a patch of adjacent optical detectors the optical sensor array and different pinholes collect returned light from different locations in the top transparent layer for imaging at different patches of optical detectors of the optical sensor array; and one or more extra illumination light sources placed below the device screen 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 structure to save power, and to provide additional illumination to the sensing area when the light emitting display pixels of the display panel structure are turned on to enhance optical sensing sensitivity of optical sensing at the optical sensor module. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification