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Fingerprint photocurrent detection unit, fingerprint reader, driving method and display device

A photocurrent detection and photocurrent technology, which is applied in the direction of acquiring/arranging fingerprints/palmprints, electrical components, electric solid devices, etc., can solve the problems of being easily interfered by noise and low signal strength, and achieve the goal of not being easily interfered by noise and improving signal strength. high effect

Inactive Publication Date: 2019-07-09
BOE TECH GRP CO LTD
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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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  • Fingerprint photocurrent detection unit, fingerprint reader, driving method and display device
  • Fingerprint photocurrent detection unit, fingerprint reader, driving method and display device
  • Fingerprint photocurrent detection unit, fingerprint reader, driving method and display device

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] Such as figure 1 As shown, the fingerprint photocurrent detection unit described in the embodiment of the present invention includes:

[0061] The conversion circuit 11 is connected to the fingerprint photocurrent reading line RL, and is used to convert the fingerprint photocurrent read by the fingerprint photocurrent reading line RL into a corresponding square wave signal; and,

[0062] The detection circuit 12 is connected with the conversion circuit...

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Abstract

The invention provides a fingerprint photocurrent detection unit, a fingerprint identifier, a driving method and a display device. The fingerprint photocurrent detection unit includes: a conversion circuit connected to the fingerprint photocurrent reading line for converting the fingerprint photocurrent read by the fingerprint photocurrent reading line into a corresponding square wave signal; and a detection circuit , connected with the conversion circuit, used to detect the square wave signal, and obtain fingerprint photocurrent information through the frequency of the square wave signal. The fingerprint photocurrent detection unit, fingerprint reader, driving method and display device of the present invention convert the fingerprint photocurrent read by the fingerprint photocurrent reading line into a corresponding square wave signal through the conversion circuit, that is, realize optical fingerprint detection from The process of converting electrical physical quantities to frequency detection adopts the method of frequency detection, which has high signal strength and is not easily disturbed by noise.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06F3/041
CPCG06F3/0412G06V40/1318H01L27/14678G06F2218/08H01L27/1222H01L29/78672
Inventor 丁小梁董学吕敬王海生吴俊纬刘英明刘伟王鹏鹏韩艳玲曹学友
Owner BOE TECH GRP CO LTD
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