Fingerprint identification system and test device

Abstract

A fingerprint identification system and a test device including the fingerprint identification system, the fingerprint identification system includes: a fingerprint sensor for detecting a fingerprint pattern and converting the fingerprint pattern into a discrete analog signal about fingerprint information; a drive circuit The unit is used to perform data processing on the discrete analog signal detected by the fingerprint sensor, and the drive circuit unit includes: a controller used to drive the fingerprint sensor; a sampling and holding circuit used to collect and maintain the instantaneous voltage of the discrete analog signal , forming a continuous analog signal; an analog-to-digital conversion unit, used to convert the continuous analog signal into a digital signal; a full-scale voltage adjustment unit, used to adjust the full-scale voltage of the analog-to-digital conversion unit, and the full-scale voltage is the analog-to-digital conversion unit Maximum input voltage for analog-to-digital conversion. The fingerprint identification system has excellent performance, high yield rate, and overcomes the problem of short service life caused by aging.

Description

technical field [0001] The invention relates to the technical field of semiconductor sensors, in particular to a fingerprint identification system and a testing device. Background technique [0002] With the development of fingerprint identification technology, fingerprint identification systems are more and more used in daily life, such as fingerprint identification access control systems, laptops with fingerprint identification, etc. A technical solution of a fingerprint identification device is disclosed in Chinese patent application No. 200810188287.X. [0003] refer to figure 1 , shows a schematic diagram of a prior art fingerprint recognition system. The fingerprint recognition system includes: a fingerprint sensor 100 and a drive circuit unit 200, wherein: the fingerprint sensor 100 is used to detect fingerprint patterns, and converts the fingerprint patterns into discrete analog signals about fingerprint information, and the drive circuit unit 200 is used to drive ...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, due to the limitation of the manufacturing process, the analog signal about the fingerprint information detected by the fingerprint sensor is usually small, and when performing analog-to-digital conversion, the voltage of some analog signals is not within the range of the input voltage of the analog-to-digital conversion unit. The digital signal obtained by analog-to-digital conversion cannot truly reflect the fingerprint information, so that the fingerprint identification system is prone to errors when performing fingerprint identification, resulting in a higher rejection rate (FRR, False Rejection Rate) or false recognition rate (FAR, False Rejection Rate). Acceptance Rate)

Images