公开(公告)号：US20200065543A1

公开(公告)日：2020-02-27

申请号：US16673080

申请日：2019-11-04

Applicant: Samsung Electronics Co., Ltd.

Inventor： Jin-Uk JEON ,  Sun-Kwon KIM ,  Seung-Hoon LEE

IPC: G06K9/00

Abstract: A fingerprint sensor includes a pixel array, an analog-to-digital converter, and a reference signal generator. The pixel array includes a plurality of unit pixels arranged in rows and columns, and each of the plurality of unit pixels generates an analog signal by detecting a fingerprint of a user. The analog-to-digital converter performs an analog-to-digital conversion operation on the analog signal to generate a digital signal. The analog-to-digital converter is configured to perform the analog-to-digital conversion based on a reference signal. The reference signal generator generates the reference signal such that the reference signal decreases at a first rate from a start voltage, and adjusts a magnitude of the start voltage based on the digital signal.