Optical fingerprint sensor
First Claim
Patent Images
1. An optical fingerprint sensor, comprising:
- an image sensor array;
a collimator filter layer disposed above the image sensor array, the collimator filter layer having an array of apertures, wherein the array of apertures are positioned to receive light from a light source for fingerprint imaging, and wherein sidewalls of the apertures in the array of apertures include structures to prevent light from reflecting off the sidewalls and reaching the image sensor array, wherein the structures comprise grooved surfaces; and
a reflective layer disposed on a top surface of the collimator filter layer, wherein the reflective layer is configured to reflect and direct light towards a sensing surface.
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Abstract
Systems and methods for optical imaging are disclosed. The optical fingerprint sensor includes an image sensor array; a collimator filter layer disposed above the image sensor array, the collimator filter layer having an array of apertures; and an illumination layer disposed above the collimator filter layer. The collimator filter layer filters reflected light such that only certain of the reflected light beams reach optical sensing elements in the image sensor array. Employing the collimator filter layer prevents blurring while allowing for a lower-profile image sensor.
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Citations
18 Claims
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1. An optical fingerprint sensor, comprising:
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an image sensor array; a collimator filter layer disposed above the image sensor array, the collimator filter layer having an array of apertures, wherein the array of apertures are positioned to receive light from a light source for fingerprint imaging, and wherein sidewalls of the apertures in the array of apertures include structures to prevent light from reflecting off the sidewalls and reaching the image sensor array, wherein the structures comprise grooved surfaces; and a reflective layer disposed on a top surface of the collimator filter layer, wherein the reflective layer is configured to reflect and direct light towards a sensing surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical fingerprint sensor, comprising:
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a collimating layer including a plurality of apertures and a top surface, wherein the plurality of apertures are configured to block a first portion of light originated from a light source and to transmit a second portion of the light, and wherein the top surface is configured to reflect a third portion of the light towards a sensing region; and an image sensor layer disposed below the collimating layer, the image sensor layer including an array of optical sensor elements arranged to receive the second portion of light transmitted through one of the plurality of apertures; wherein sidewalls of the apertures in the plurality of apertures of the collimating layer include structures to prevent light from reflecting off the sidewalls and reaching the image sensor layer, wherein the structures comprise grooved surfaces. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification