Optical sensor using collimator
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 a ratio of a height of the apertures to a diameter of the apertures is between 3;
1 and 100;
1; and
an illumination layer disposed above the collimator layer, wherein the illumination layer comprises a display, the display being a light source for fingerprint imaging.
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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.
115 Citations
20 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 a ratio of a height of the apertures to a diameter of the apertures is between 3;
1 and 100;
1; andan illumination layer disposed above the collimator layer, wherein the illumination layer comprises a display, the display being a light source for fingerprint imaging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical fingerprint sensor, comprising:
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an illumination layer, wherein the illumination layer comprises a display, the display being a light source configured to direct light to a sensing region for fingerprint imaging; a collimating layer, disposed below the illumination layer, and including a plurality of apertures, wherein the apertures are configured to block a portion of light from the illumination layer and wherein a ratio of a height of the apertures to a diameter of the apertures is between 3;
1 and 100;
1; andan image sensor layer, disposed below the collimating layer, and including an array of optical sensor elements arranged so that a plurality of the sensor elements receive light transmitted through one of the plurality of apertures. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of imaging a fingerprint using a device, comprising:
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transmitting, from a display, light in an illumination region such that at least a portion of light reflects from a sensing region; blocking at least a first portion of the light reflected from the sensing region at a surface of a collimating layer;
wherein the collimating layer is below the display;blocking at least a second portion of the light reflected from the sensing region within a plurality of apertures of the collimating layer wherein a ratio of a height of the apertures to a diameter of the apertures is between 3;
1 and 100;
1; andsensing, at a plurality of optical sensor elements in a sensor array, a third portion of light reflected from the sensing region, the third portion of light being passed through at least one of the plurality of apertures in the collimating layer. - View Dependent Claims (19, 20)
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Specification