FINGER DETECTION DEVICE AND METHOD OF FINGERPRINT RECOGNITION INTEGRATED CIRCUIT

摘要

A finger detection device and method of a fingerprint recognition IC is disclosed. The device comprises sensing electrodes, a capacitive sensing layer, a signal processing circuit, a multiplexer module and a signal register. The sensing electrodes are defined as a fingerprint sensing zone. The capacitive sensing layer covers the sensing electrodes. The signal processing circuit is arranged below and electrically connected with the sensing electrodes. The multiplexer module defines a finger detection zone. The finger detection zone includes at least one of the sensing electrodes. The signal register is electrically connected with the signal processing circuit, receiving a detection signal generated by the finger detection zone and comparing the detection signal with a preset value. The finger detection device uses only a portion of the sensing electrodes to detect a finger approaching/contacting it to determine triggering or sleeping of the fingerprint recognition IC and thus reduces power consumption.

主权项

1. A finger detection device of a fingerprint recognition integrated circuit, comprising a plurality of sensing electrodes arranged into an array and defined as a fingerprint sensing zone;
a capacitive sensing layer covering said sensing electrodes; a signal processing circuit arranged below said sensing electrodes and electrically connected with said sensing electrodes; a multiplexer module including at least one of a first multiplexer and a second multiplexer, wherein said first multiplexer is electrically connected with said sensing electrodes along a first direction, and wherein said second multiplexer is electrically connected with said sensing electrodes along a second direction, and wherein said first direction is perpendicular to said second direction, and wherein said multiplexer module triggers at least one of said first multiplexer and said second multiplexer and defines a finger detection zone, and wherein said finger detection zone includes at least one of said sensing electrodes; and a signal register electrically connected with said signal processing circuit, receiving a detection signal generated by said finger detection zone, and comparing said detection signal with a preset value.