The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 2019
Filed:
Oct. 12, 2017
Shenzhen Goodix Technology Co., Ltd., Shenzhen, CN;
Kuohao Chao, Shenzhen, CN;
Mengta Yang, Shenzhen, CN;
SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen, CN;
Abstract
Provided is a fingerprint identification system, comprising: a plurality of first pixel circuits; a first sensing circuit for sensing a contact capacitance and outputting a first output signal, where the first output signal contains a big signal component and a small signal component, and the small signal component correlates with a change amount of the contact capacitance; at least one second pixel circuit; a second sensing circuit for outputting a second output signal, where the second output signal is equal to the big signal component; and a differential amplifying circuit for amplifying a difference value between the first output signal and the second output signal so as to generate an amplifying output signal, where the amplifying output signal correlates with the small signal component.