Method and system for calibration of an optical fingerprint sensing device
First Claim
1. An optical fingerprint sensing device comprising an array of photosensitive elements configured to capture a fingerprint pattern, said optical fingerprint sensing device comprising at least one processor configured to:
- acquire information indicative of a change of an environmental parameter influencing the operation of said optical fingerprint sensing device; and
if said change is larger than a predetermined threshold value, perform a calibration operation of said optical fingerprint sensing device,wherein said optical fingerprint sensing device further comprises a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor, andwherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength,wherein acquiring information indicative of a change of an environmental parameter comprises;
determining a present value of the environmental parameter;
determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and
if said difference is larger than said predetermined threshold value, performing said calibration operation of said optical fingerprint sensing device, andwherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation.
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Abstract
A method of initiating a calibration operation of an optical fingerprint sensing device comprising an array of photosensitive elements for capturing a fingerprint pattern, the method comprising acquiring information indicative of a change of an environmental parameter influencing the operation of the fingerprint sensing device; and if the change is larger than a predetermined threshold value, performing a calibration operation of the fingerprint sensing device. There is also provided a fingerprint sensing device configured to perform the method, and a consumer electronic device comprising such a fingerprint sensing device.
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Citations
21 Claims
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1. An optical fingerprint sensing device comprising an array of photosensitive elements configured to capture a fingerprint pattern, said optical fingerprint sensing device comprising at least one processor configured to:
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acquire information indicative of a change of an environmental parameter influencing the operation of said optical fingerprint sensing device; and if said change is larger than a predetermined threshold value, perform a calibration operation of said optical fingerprint sensing device, wherein said optical fingerprint sensing device further comprises a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor, and wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength, wherein acquiring information indicative of a change of an environmental parameter comprises; determining a present value of the environmental parameter; determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and if said difference is larger than said predetermined threshold value, performing said calibration operation of said optical fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of initiating a calibration operation of an optical fingerprint sensing device comprising an array of photosensitive elements configured to capture a fingerprint pattern, said method comprising:
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acquiring information indicative of a change of an environmental parameter influencing the operation of said optical fingerprint sensing device; and if said change is larger than a predetermined threshold value, initiating a calibration operation of said optical fingerprint sensing device, wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength, wherein acquiring information indicative of a change of an environmental parameter comprises; determining a present value of the environmental parameter; determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and if said difference is larger than said predetermined threshold value, performing said calibration operation of said optical fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An electronic consumer device comprising a display panel and an optical fingerprint sensing device arranged underneath the display panel and configured to capture an image of a finger in contact with an outer surface of the display panel, the optical fingerprint sensing device comprising an array of photosensitive elements configured to capture a fingerprint pattern, said electronic consumer device comprising at least one processor configured to:
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acquire information indicative of a change of an environmental parameter influencing the operation of said optical fingerprint sensing device; and if said change is larger than a predetermined threshold value, perform a calibration operation of said optical fingerprint sensing device, wherein said optical fingerprint sensing device or said electronic consumer device further comprises a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor, and wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength, wherein acquiring information indicative of a change of an environmental parameter comprises; determining a present value of the environmental parameter; determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and if said difference is larger than said predetermined threshold value, performing said calibration operation of said optical fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation.
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Specification