Reduction of noise interference for fingerprint sensing
AssigneeImage Match Design Inc.
InventorYehsuan YAN
Life of this patent
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Abstract
In a fingerprint sensor, two adjacent sensing plates are detected at a same time to obtain first sensing data and second sensing data therefrom respectively, so that the first sensing data and the second sensing data include a same noise, then the first sensing data is subtracted from the second sensing data to generate a difference by which the noise is eliminated, and the difference is added to first fingerprint data corresponding to the sensing plate which provides the first sensing data, resulting in second fingerprint data corresponding to the other sensing plate. The fingerprint portions on the two adjacent sensing plates are determined according to the first and the second fingerprint data respectively.
Claims14
A method for reducing noise interference in a fingerprint sensor having a plurality of sensing plates for fingerprint sensing, the method comprising steps of:
- simultaneously detecting a first sensing plate and a second sensing plate of the plurality of sensing plates, thereby obtaining first sensing data and second sensing data therefrom respectively, wherein the second sensing plate is adjacent to the first sensing plate;
- extracting a first difference between the second sensing data and the first sensing data;
- combining the first difference with first fingerprint data to obtain second fingerprint data;
- and
- determining a fingerprint portion on the first sensing plate and a fingerprint portion on the second sensing plate according to the first fingerprint data and the second fingerprint data respectively.
A fingerprint sensor, comprising:
- a first sensing plate;
- a second sensing plate adjacent to the first sensing plate;
- a first sensing circuit connected to the first sensing plate and configured to detect the first sensing plate;
- a second sensing circuit connected to the second sensing plate and configured to detect the second sensing plate, wherein the first sensing circuit and the second sensing circuit simultaneously detect the first sensing plate and the second sensing plate, to generate first sensing data and second sensing data therefrom respectively;
- a first subtractor connected to the first sensing circuit and the second sensing circuit, and configured to subtract the first sensing data from the second sensing data to thereby generate a first difference;
- and
- a first adder connected to the first subtractor, and configured to add the first difference to first fingerprint data to thereby generate second fingerprint data for use in determining a fingerprint portion on the second sensing plate, wherein the first fingerprint data is used to determine a fingerprint portion on the first sensing plate.
Dependencies are inferred from the claim text.