CAPACITIVE FINGERPRINT SENSING APPARATUS AND CAPACITIVE FINGERPRINT SENSING METHOD

摘要

A capacitive fingerprint sensing apparatus includes sensing electrodes, a sensing driver, and a processing module. In a self-capacitive sensing mode, the sensing driver performs self-capacitive sensing on at least one sensing electrode to obtain a first fingerprint sensing signal. In a mutual-capacitive sensing mode, the sensing driver performs mutual-capacitive sensing on at least two adjacent sensing electrodes to obtain a second fingerprint sensing signal. The processing module generates a first fingerprint pattern and a second fingerprint pattern according to the first fingerprint sensing signal and the second fingerprint sensing signal and combines the first fingerprint pattern and the second fingerprint pattern into a combined fingerprint pattern. The resolution of the combined fingerprint pattern along at least one direction is larger than that of the first fingerprint pattern and the second fingerprint pattern along the at least one direction.

主权项

1. A capacitive fingerprint sensing apparatus operated in a self-capacitive sensing mode or a mutual-capacitive sensing mode, the capacitive fingerprint sensing apparatus comprising:
a plurality of sensing electrodes; a sensing driver coupled to the plurality of sensing electrodes, when the capacitive fingerprint sensing apparatus is operated in the self-capacitive sensing mode, the sensing driver performing a self-capacitive sensing on at least one sensing electrode of the plurality of sensing electrodes to obtain a first fingerprint sensing signal; when the capacitive fingerprint sensing apparatus is operated in the mutual-capacitive sensing mode, the sensing driver performing a mutual-capacitive sensing on at least two adjacent sensing electrodes of the plurality of sensing electrodes to obtain a second fingerprint sensing signal; and a processing module coupled to the sensing driver and configured to generate a first fingerprint pattern and a second fingerprint pattern according to the first fingerprint sensing signal and the second fingerprint sensing signal respectively and then combine the first fingerprint pattern and the second fingerprint pattern into a combined fingerprint pattern; wherein a resolution of the combined fingerprint pattern along at least one direction is larger than a resolution of the first fingerprint pattern along the at least one direction and a resolution of the second fingerprint pattern along the at least one direction.