Detection control circuit, fingerprint identification circuit and optical fingerprint module

Abstract

A detection control circuit, including a power supply, an identification switch element, an exposure control element and a photoelectric conversion circuit connected in sequence, the identification switch element is also connected to the light intensity detection circuit, and the identification switch element is used to guide the light intensity detected by the light intensity detection circuit Connecting or disconnecting the connection between the power supply and the input end of the exposure control element, the exposure control element is used to control the connection and identification time of the switching element and the photoelectric conversion circuit according to the light intensity, the photoelectric conversion circuit includes a first photosensitive element, a photoelectric conversion circuit It is used to convert the received optical signal into a corresponding electrical signal and output it to the signal output line when the identification switch element communicates with the first photosensitive element; a fingerprint identification circuit, including a plurality of the above-mentioned detection control circuits; an optical The fingerprint module includes the above-mentioned fingerprint identification circuit. The detection control circuit, the fingerprint recognition circuit and the optical fingerprint module provided by the invention can avoid false recognition of fingerprint collection and realize faster fingerprint collection speed.

Description

technical field [0001] The invention relates to the technical field of fingerprint identification, in particular to a detection control circuit, a fingerprint identification circuit and an optical fingerprint module. Background technique [0002] With the rapid development of the mobile Internet, the information interaction between mobile terminal users is also growing rapidly. The biometric technology in the mobile smartphone interactive unlocking scheme has become an emerging interactive technology, and the fingerprint recognition unlocking technology is even more important. It has become a convenient and fast unlocking method. [0003] In the current optical fingerprint module, a single acquisition unit on the optical fingerprint chip is composed of a photodiode and a MOS transistor (metal oxide semiconductor field effect transistor, metal oxide semiconductor). When the photodiode on the optical fingerprint chip senses When the light is illuminated and the intensity of t...

AI Technical Summary

Problems solved by technology

[0003] In the current optical fingerprint module, a single acquisition unit on the optical fingerprint chip is composed of a photodiode and a MOS transistor (metal oxide semiconductor field effect transistor, metal oxide semiconductor). When the photodiode on the optical fingerprint chip senses When the light is illuminated and the intensity of the light can stimulate photoelectric conversion, the optical fingerprint chip will start to collect fingerprints, so there will be a problem of misidentification when the optical fingerprint chip senses the light when it is not touched by a finger. In addition, the optical fingerprint module collocation When using a full-screen mobile phone, there are still problems of slow acquisition rate and poor experience

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