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CAPACITIVE FINGERPRINT SENSING APPARATUS AND CAPACITIVE FINGERPRINT SENSING METHOD

  • US 20160314333A1
  • Filed: 04/26/2016
  • Published: 10/27/2016
  • Est. Priority Date: 04/27/2015
  • Status: Active Grant
First Claim
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1. A capacitive fingerprint sensing apparatus, comprising:

  • M sensing lines;

    N scanning lines;

    a scanning driver coupled to the N scanning lines;

    a sensing driver coupled to the M sensing lines;

    a plurality of sensing electrodes arranged to form a (N*M) matrix having N rows of sensing electrodes and M columns of sensing electrodes, wherein the M columns of sensing electrodes are arranged along a first direction and coupled to the M sensing lines respectively and the N rows of sensing electrodes are arranged along a second direction and coupled to the N scanning lines respectively, M and N are positive integers; and

    a processing module coupled to the plurality of sensing electrodes;

    wherein in a self-capacitive sensing mode, the scanning driver scans the N rows of sensing electrodes through the N scanning lines respectively and the sensing driver performs self-capacitive sensing on the M columns of sensing electrodes through the M sensing lines respectively and the processing module obtains a first fingerprint pattern;

    in a mutual-capacitive sensing mode, the scanning driver scans N rows of sensing electrodes through N scanning lines respectively and the sensing driver performs mutual-capacitive sensing between odd columns of sensing electrodes and even columns of sensing electrodes of the N rows of sensing electrodes through odd sensing lines and even sensing lines of the M sensing lines respectively and the processing module obtains a second fingerprint pattern;

    the processing module combines the first fingerprint pattern and second fingerprint pattern into a synthesized fingerprint pattern, and a resolution of the synthesized fingerprint pattern along at least one direction is larger than a resolution of the first fingerprint pattern and a resolution of the second fingerprint pattern along the at least one direction, wherein the at least one direction comprises at least one of the first direction, the second direction, . . . , and a L-th direction, and L≧

    3.

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