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:
Apr. 20, 2021
Filed:
Jul. 26, 2019
Egis Technology Inc., Taipei, TW;
Igistec Co., Ltd., Hsinchu County, TW;
Yu-Hsuan Lin, Hsinchu County, TW;
Tang-Hung Po, Hsinchu County, TW;
Chung-Yi Wang, Hsinchu County, TW;
EGIS TECHNOLOGY INC., Taipei, TW;
IGISTEC CO.. LTD., Hsinchu County, TW;
Abstract
An optical fingerprint sensor and a fingerprint identification method are provided. The optical fingerprint sensor includes a photosensitive element and a signal processing circuit. The signal processing circuit includes a logic unit, a variable/programmable gain amplifier and a processing unit. The logic unit is electrically coupled to the photosensitive element. The variable/programmable gain amplifier is electrically coupled to the logic unit. The processing unit is electrically coupled to the variable/programmable gain amplifier and the logic unit. The variable/programmable gain amplifier adaptively switches a gain between a first gain value and a second gain value, wherein the second gain value is larger than the first gain value. After the signals inputted into the variable/programmable gain amplifier are properly processed according to the first gain value or the second gain value, the optical fingerprint sensor acquires a sharp sensing image.