公开(公告)号：US11789133B2

公开(公告)日：2023-10-17

申请号：US16829467

申请日：2020-03-25

Applicant: Samsung Electronics Co., Ltd.

Inventor： Muncheon Kang ,  Kwanghyuk Bae ,  Hayoung Ko ,  Duckchan Seo ,  Chulwoong Lee

IPC: G01S17/08 ,  G01S7/48 ,  G01S7/497

CPC classification number: G01S7/497 ,  G01S7/4808 ,  G01S17/08

Abstract: A method of calibrating errors in a time-of-flight (ToF) sensor includes illuminating a test object with a transmission light that is modulated based on a modulation signal; generating, using a buffer chain circuit, a plurality of demodulation signals having different local delay phases; providing a plurality of measured phase differences by providing the plurality of demodulation signals to a plurality of pixel groups included in a ToF sensor to sample a reception light reflected from the test object based on the plurality of demodulation signals; determining a wiggling error based on the plurality of measured phase differences, the wiggling error depending on a phase difference between the transmission light and the reception light; and calibrating a measured distance from the ToF sensor to a target object based on the wiggling error.