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. 03, 2020
Filed:
Jul. 30, 2019
Egis Technology Inc., Taipei, TW;
Igistec Co., Ltd., Hsinchu County, TW;
Yu-Hsuan Lin, Hsinchu County, TW;
Tang-Hung Po, Hsinchu County, TW;
Hsien-Hsiang Chiu, Hsinchu County, TW;
Chung-Yi Wang, Hsinchu County, TW;
EGIS TECHNOLOGY INC., Taipei, TW;
IGISTEC CO., LTD., Hsinchu County, TW;
Abstract
A fingerprint sensing module includes a fingerprint sensing pixel array, a plurality of column circuitries and a constant current circuit. The fingerprint sensing pixel array includes a plurality of sensing pixels in an array arrangement. Each column circuitry is electrically coupled to a row of the sensing pixels via a corresponding row signal line. The constant current circuit generates a bias voltage to the column circuitries according to a reference current. In response to the bias voltage level, a row output current provided by each column circuitry and flowing through each row of the sensing pixels is equal to or close to the reference current. Since the row output current coincides with the reference current, the row output current is not adversely affected by the external factors.