US Patent 10521639 Reduction of noise interference for fingerprint sensing

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.