公开(公告)号：US20200209984A1

公开(公告)日：2020-07-02

申请号：US16235335

申请日：2018-12-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： TING LI ,  RAHMI HEZAR ,  SRINATH MATHUR RAMASWAMY ,  ANAND DABAK ,  BAHER HAROUN

IPC: G06F3/03 ,  G01S17/48 ,  G01S7/486 ,  G06F3/042 ,  G06F3/038 ,  G06F3/041 ,  G06F3/0346

Abstract: An optical position sensing system is disclosed. The system includes a substrate having a surface. A plurality of photodetectors are at multiple locations across the surface, each of the plurality of photodetectors providing detector pulse signals in response to receiving the light. The system further includes a processor that determines a phase shift between the transmitted light pulse signals and the respective detector pulse signals and applies a multi-path resolution operation to distinguish between the detector pulse signals representing the transmitted light pulse signals and those representing reflected light pulse signals. The processor also calculates a distance of a transmitting device from each of the photodetectors based on the determined phase shift and the multi-path resolution operation and calculates a multi-dimensional position of the transmitting device relative to the substrate based on the calculated distances.