Under display optical fingerprint sensor arrangement for mitigating moiré effects
AssigneeSynaptics Incorporated
InventorsBob Lee Mackey, Robert John Gove
Life of this patent
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Abstract
A system and method for an electronic device for imaging a biometric object having structural features of interest is disclosed. The electronic device includes a display including rows of pixel elements, the rows of pixel elements being parallel a first primary direction along a first axis and an optical sensor mounted underneath the display, the optical sensor being parallel to a second primary direction along a second axis. The second axis is rotated at an angle relative the first axis to adjust a moiré pattern outside of a frequency range of the features of interest.
Claims20
An electronic device for imaging a biometric object having structural features of interest, comprising:
- a display including rows of pixel elements, the rows of pixel elements being parallel to a first primary direction along a first axis;
- and
- an optical sensor disposed underneath the display, the optical sensor being parallel to a second primary direction along a second axis,
- wherein the second axis has an angle relative the first axis and wherein the angle adjusts a moiré pattern frequency outside of a frequency range corresponding to the structural features of interest to reduce moiré effect on images when imaging the biometric.
An electronic device, comprising:
- a display having rows of pixel elements parallel to a first primary axis;
- and
- an optical sensor having rows of sensing elements parallel to a second primary axis, the optical sensor configured to image a fingerprint,
- wherein the optical sensor is disposed underneath the display and oriented such that the second primary axis is rotated relative to the first primary axis at an angle θ, the angle θ being sufficient to reduce moiré effect on images when imaging the fingerprint.
A method for determining an angle to mount an optical sensor relative to a display to mitigate moiré patterns, comprising:
- determining a frequency of components of the display;
- determining a frequency of components of the optical sensor;
- determining a frequency of moiré patterns reaching the optical sensor when mounted below the display;
- and
- determining the angle based on the frequency of the components of the display and the frequency of the components of the sensor, wherein the angle adjusts the frequency of the moiré patterns to reduce moiré effect on images when imaging a biometric.
Dependencies are inferred from the claim text.