公开(公告)号：US20170255806A1

公开(公告)日：2017-09-07

申请号：US15393682

申请日：2016-12-29

Applicant: Samsung Electronics Co., Ltd.

Inventor： Shin-Wuk KANG ,  Sun-Kwon Kim ,  Jin-Uk Jeon

IPC: G06K9/00

CPC classification number: G06K9/0002

Abstract: A fingerprint sensor includes a pixel array and a controller. The pixel array includes a plurality of unit pixels arranged in rows and columns, each of the plurality of unit pixels including, a sensing electrode configured to form a detection capacitance with a finger, a signal generation circuit configured to output an analog signal through a column line based on the detection capacitance, and a protection circuit configured to control a voltage transfer between the sensing electrode and a common line. The controller is configured to control the protection circuit in each of the plurality of unit pixels to transfer a voltage at the sensing electrode of an active unit pixel of the plurality of unit pixels to the sensing electrode in at least one protection unit pixel of the plurality of unit pixels through the common line.

公开(公告)号：US11256892B2

公开(公告)日：2022-02-22

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.

公开(公告)号：US10410032B2

公开(公告)日：2019-09-10

申请号：US15393682

申请日：2016-12-29

Applicant: Samsung Electronics Co., ltd.

Inventor： Shin-Wuk Kang ,  Sun-Kwon Kim ,  Jin-Uk Jeon

IPC: G06K9/00

Abstract: A fingerprint sensor includes a pixel array and a controller. The pixel array includes a plurality of unit pixels arranged in rows and columns, each of the plurality of unit pixels including, a sensing electrode configured to form a detection capacitance with a finger, a signal generation circuit configured to output an analog signal through a column line based on the detection capacitance, and a protection circuit configured to control a voltage transfer between the sensing electrode and a common line. The controller is configured to control the protection circuit in each of the plurality of unit pixels to transfer a voltage at the sensing electrode of an active unit pixel of the plurality of unit pixels to the sensing electrode in at least one protection unit pixel of the plurality of unit pixels through the common line.