Fingerprint recognition system and fingerprint recognition method

Abstract

The invention provides a fingerprint recognition system and a fingerprint recognition method. The fingerprint recognition system comprises a fingerprint recognition device, a detecting electrode and a contact detecting device, wherein the contact detecting device comprises an analog-to-digital converter and a judging module; the analog-to-digital converter is used for charging and discharging the detecting electrode and detecting a capacitance value on the detecting electrode; the judging module is used for judging whether fingers of a user touch the detecting electrode or not according to the capacitance value; and finger touch information is generated when the fingers of the user touch the detecting electrode so as to start the fingerprint recognition device to recognize fingerprints. By the fingerprint recognition system, most of functional modules of the fingerprint recognition device are in a dormant state when the fingerprint touch recognition device is not detected, the fingerprint recognition device is started to recognize the fingerprints when the fingers of the user touch the fingerprint recognition device, the fingerprints of the user can be recognized reliably and effectively, and power consumption of the fingerprint recognition device is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fingerprint detection, in particular to a fingerprint recognition system and method. Background technique [0002] At present, capacitive sensing fingerprint identification devices have begun to be applied in a new generation of portable electronic devices. The fingerprint identification device scans the user's fingerprint, extracts the features of the scanned fingerprint, encrypts and transmits the fingerprint information, and then compares the obtained fingerprint information with the pre-stored fingerprint information, so as to complete the identification of the user's fingerprint. certified. [0003] However, since the fingerprint identification device needs to scan a larger finger area each time it scans the fingerprint, and it needs to scan under the condition of a pixel density greater than 500dpi (dots per inch, the number of dots printed per inch) to obtain a sufficiently high accuracy. Fingerp...

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Problems solved by technology

[0003] However, since the fingerprint identification device needs to scan a larger finger area each time it scans the fingerprint, and it needs to scan under the condition of a pixel density greater than 500dpi (dots per inch, the number of dots printed per inch) to obtain a sufficiently high accuracy. Fingerprint information, so signal processing modules such as low-noise amplifiers, analog-to-digital converters, and central processing units usually need to be turned on to extract fingerprint information, resulting in a large power consumption for fingerprint identification devices when performing fingerprint identification

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