公开(公告)号：US20250085162A1

公开(公告)日：2025-03-13

申请号：US18885774

申请日：2024-09-16

Applicant: PixArt Imaging Inc.

Inventor： TSO-SHENG TSAI ,  KUEI-YANG TSENG ,  YUEH-LIN CHUNG

IPC: G01J1/44

Abstract: There is provided an optical sensor including an SPAD pixel array, multiple counters and a processor. The multiple counters count photon events of the SPAD pixel array to output an event-based vision sensor (EVS) frame per EVS period. The processor determines an index state of each pixel of the SPAD pixel array by comparing a counting value of each pixel respectively at a predetermined number of checking points with two predetermined thresholds, and calculates an index change of the index state associated with each pixel between adjacent EVS frames. The processor further changes the EVS period and/or adds a count offset to the counting value of each pixel to improve sensitivity of the event-based vision sensor.

公开(公告)号：US20250123394A1

公开(公告)日：2025-04-17

申请号：US18985100

申请日：2024-12-18

Applicant: PixArt Imaging Inc.

Inventor： YUEH-LIN CHUNG ,  TSO-SHENG TSAI

IPC: G01S17/36 ,  G01S7/4911 ,  G01S7/4913 ,  G01S7/4915

Abstract: There is provided a distance measurement device including a light source, a light detector, a time control circuit and a processor. In first measurement, the time control circuit controls the light source to illuminate at a low modulation frequency, and the processor calculates a rough flying time according to a first detection signal of the light detector to determine an operating phase zone and a delay time. In second measurement, the time control circuit controls the light source to illuminate at a high modulation frequency and causes a light driving signal of the light source and a detecting control signal of the light detector to have a difference of the delay time, and the processor calculates a fine flying time according to a second detection signal of the light detector.

公开(公告)号：US20230236299A1

公开(公告)日：2023-07-27

申请号：US18129078

申请日：2023-03-31

Applicant: PIXART IMAGING INC.

Inventor： TSO-SHENG TSAI ,  YUEH-LIN CHUNG ,  SHIN-LIN WANG

IPC: G01S7/497 ,  G01S17/10 ,  G01S7/481 ,  G01S7/4865

CPC classification number: G01S7/497 ,  G01S17/10 ,  G01S7/4816 ,  G01S7/4814 ,  G01S7/4865

Abstract: There is provided a time of flight sensor including a light source, a first pixel, a second pixel and a processor. The first pixel generates a first output signal without receiving reflected light from an external object illuminated by the light source. The second pixel generates a second output signal by receiving the reflected light from the external object illuminated by the light source. The processor calculates deviation compensation and deviation correction associated with temperature variation according to the first output signal to accordingly calibrate a distance calculated according to the second output signal.