Biometric imaging arrangement for infrared imaging comprising a waveguide formed on an image sensor
AssigneeFingerprint Cards Anacatum IP AB
InventorsJohan Hammersberg, Pontus Jägemalm
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Abstract
The present invention relates to a biometric imaging arrangement comprising: an image sensor comprising a detector pixel array configured to detect infrared radiation transmitted from an object for capturing an image, a waveguide structure arranged on the image sensor to cover the detector pixel array, the waveguide structure comprising optical decoupling areas configured to orthogonally redirect infrared light received from a side of the waveguide structure towards the object when being placed for imaging.
Claims17
A biometric imaging arrangement comprising:
- an image sensor comprising a detector pixel array configured to detect infrared radiation transmitted from an object for capturing an image, the detector pixel array being arranged on a first side of the image sensor,
- a waveguide structure attached directly on the detector pixel array side of the image sensor to cover the detector pixel array, the waveguide structure comprising optical decoupling areas configured to orthogonally redirect infrared light received from a side of the waveguide structure towards the object when being placed for imaging,
- wherein the biometric imaging arrangement is configured (i) to be arranged under a display panel of an electronic device comprising a display, and to acquire an image of the object located on an opposite side of the display panel, and
- wherein the waveguide structure comprises a grating pattern adapted to form the optical decoupling areas for redirecting the infrared light through openings in the display and towards the object.
A method for manufacturing a biometric imaging arrangement comprising an image sensor having a detector pixel array, the method comprising:
- depositing a waveguide structure material on the detector pixel array of the image sensor;
- patterning the waveguide structure material to form decoupling areas configured to orthogonally redirect infrared light away from a plane of the detector pixel array;
- and
- producing the image sensor in a single production flow as the deposition and patterning of the waveguide structure material.
Dependencies are inferred from the claim text.