Hybrid fingerprint acquisition chip and acquisition method

Abstract

The invention provides a multi-mode fingerprint acquisition chip and acquisition method. The chip comprises a two-dimensional sensing unit array with M rows and N columns, a passivation insulating layer which directly covers the two-dimensional sensing unit array, a polyester composite insulating layer which covers the passivation insulating layer, a scanning controller which allows M sensing units to scan effectively from top to bottom or from bottom to top, a driving circuit which provides a time sequence control signal needed by a sensing unit, an ADC array which is configured next to or above a sensing electrode, a buffer shift register, a mode control circuit which controls the working mode of the chip, an antenna metal frame, an RF driving circuit, a detection electrode for detecting a fake finger and a fake finger detection electrode. The parameter of the circuit is controlled through a host machine configuration mode, the multi-mode finger detection and collection can be realized by the chip, different working modes are selected according to different application occasions, thus the chip is more flexible and convenient, a fake finger can be effectively rejected through the fake finger detection electrode, thus the security of fingerprint information is improved.

Description

technical field [0001] The present invention relates to the field of integrated circuit design, in particular to a chip for hybrid fingerprint collection and a collection method thereof. Background technique [0002] As people's requirements for information security are getting higher and higher, living biometric authentication and identification are more and more used in people's daily life. Fingerprint authentication has high reliability and cost-effectiveness in biometric authentication, and has become the mainstream of current biometric authentication. At the same time, fingerprint acquisition technology is also developing rapidly. A fingerprint sensor with lower cost, small size, low power consumption and high dynamic range will occupy a huge market. Therefore, the fingerprint sensor with the above advantages has become the focus of current research, among which Capacitive fingerprint sensors have become one of the current mainstream products. [0003] With the gradua...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a multi-mode fingerprint collection chip and a collection method thereof, which can effectively solve the above-mentioned singleness, finger residue, anti-interference, fake finger identification and collection quality problems

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