Fingerprint light current detection unit, fingerprint recognizer, driving method and display device

Abstract

The present invention provides a fingerprint light current detection unit, a fingerprint recognizer, a driving method and a display device. The fingerprint light current detection unit includes a conversion circuit and a detection circuit; the conversion circuit is connected with a fingerprint light current reading line and is used for converting the fingerprint light current of the fingerprint light current reading line into corresponding square wave signals; and the detection circuit is connected with the conversion circuit and is used for detecting the square wave signals and obtaining fingerprint light current information based on the frequency of the square wave signals. According to the fingerprint light current detection unit, the fingerprint recognizer, the driving method and the display device of the invention, the fingerprint light current of the fingerprint light current reading line is converted into corresponding square wave signals through the conversion circuit, namely, an electrical physical quantity-to-frequency detection conversion process of fingerprint light current detection can be realized; and a frequency detection mode is adopted, and therefore, signal strength is high, and the fingerprint light current detection unit has little possibility of being interfered by noises.

Description

technical field [0001] The invention relates to the technical field of fingerprint photocurrent identification, in particular to a fingerprint photocurrent detection unit, a fingerprint identifier, a driving method and a display device. Background technique [0002] In recent years, with the rapid development of technology, mobile products with biometric functions have gradually entered people's life and work. Fingerprint technology has attracted much attention due to its unique identity. Push-type and slide-type fingerprint recognition technologies based on silicon-based technology have been integrated into mobile products. In the future, the core of people's attention will be the fingerprint recognition technology in the display area. [0003] In the existing fingerprint current identification circuit, each fingerprint sensor is composed of a photodiode and a switching transistor. When scanning fingerprints, due to the difference between the valleys and ridges of the fing...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a fingerprint photocurrent detection unit, a fingerprint reader, a driving method and a display device to solve the problem that the existing fingerprint photocurrent detection method directly detects the fingerprint photocurrent, the signal strength is low, and it is easily disturbed by noise. question

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