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    Single photon avalanche diode based optical sensor, event-based vision sensor and operating method thereof
    1.
    发明授权
    Single photon avalanche diode based optical sensor, event-based vision sensor and operating method thereof 有权

    公开(公告)号：US12117339B1

    公开(公告)日：2024-10-15

    申请号：US18464304

    申请日：2023-09-11

    Applicant: PIXART IMAGING INC.

    Inventor： Tso-Sheng Tsai ,  Kuei-Yang Tseng ,  Yueh-Lin Chung

    IPC: G01J1/44

    CPC classification number: G01J1/44 ,  G01J2001/4466

    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.

    TIME OF FLIGHT SENSOR FOR CALIBRATING DETECTION DEVIATION
    3.
    发明申请
    TIME OF FLIGHT SENSOR FOR CALIBRATING DETECTION DEVIATION 有权

    公开(公告)号：US20240426991A1

    公开(公告)日：2024-12-26

    申请号：US18823748

    申请日：2024-09-04

    Applicant: PixArt Imaging Inc.

    Inventor： Tso-Sheng Tsai ,  Yueh-Lin Chung ,  Shin-Lin Wang

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

    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.

    OUTPUT STAGE CIRCUIT, DAC, TOF SYSTEM AND CURRENT DRIVING METHOD
    5.
    发明公开
    OUTPUT STAGE CIRCUIT, DAC, TOF SYSTEM AND CURRENT DRIVING METHOD 审中-公开

    公开(公告)号：US20240069173A1

    公开(公告)日：2024-02-29

    申请号：US17898432

    申请日：2022-08-29

    Applicant: PixArt Imaging Inc.

    Inventor： Yueh-Lin Chung ,  Tso-Sheng Tsai

    IPC: G01S7/4865 ,  G01B11/22 ,  H03M1/80 ,  H03M1/82

    CPC classification number: G01S7/4865 ,  G01B11/22 ,  H03M1/802 ,  H03M1/82

    Abstract: An output stage circuit, comprising: a current source circuit; an output switch circuit, comprising at least one output switch, coupled to the current source circuit, wherein an output current flows through a target circuit when the output switch circuit is conducted; at least one bias capacitor, coupled to the current source circuit; and a bias switch circuit, configured to receive a bias voltage, comprising at least one bias switch, coupled to the bias capacitor and the current source circuit, wherein the bias voltage charges the bias capacitor when the bias switch circuit is conducted. The present invention further discloses a DAC applying the output stage circuit and a TOF system applying the DAC. The conventional kick back issue can be improved by the mechanism provided by the present invention.

    Time-of-flight device using two light modulation frequencies and operating method thereof
    6.
    发明授权
    Time-of-flight device using two light modulation frequencies and operating method thereof 有权

    公开(公告)号：US12210100B2

    公开(公告)日：2025-01-28

    申请号：US18198814

    申请日：2023-05-17

    Applicant: PixArt Imaging Inc.

    Inventor： Yueh-Lin Chung ,  Tso-Sheng Tsai

    IPC: G01C3/08 ,  G01S7/4911 ,  G01S7/4913 ,  G01S7/4915 ,  G01S17/36

    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.

    OPTICAL TIME-OF-FLIGHT SENSOR, METHOD, AND PROCESSING CIRCUIT CAPABLE OF AVOIDING MISJUDGMENT OF CHANNEL SAMPLING
    8.
    发明公开
    OPTICAL TIME-OF-FLIGHT SENSOR, METHOD, AND PROCESSING CIRCUIT CAPABLE OF AVOIDING MISJUDGMENT OF CHANNEL SAMPLING 审中-公开

    公开(公告)号：US20230324524A1

    公开(公告)日：2023-10-12

    申请号：US17718250

    申请日：2022-04-11

    Applicant: PixArt Imaging Inc.

    Inventor： Yueh-Lin Chung ,  Tso-Sheng Tsai

    IPC: G01S7/4865 ,  G01S17/894 ,  G01S17/10

    CPC classification number: G01S7/4865 ,  G01S17/894 ,  G01S17/10

    Abstract: An optical time-of-flight sensor includes a sensor array and a channel sampling circuit. The channel sampling circuit is arranged for receiving a photon pulse signal, generated from a senor unit of the sensor array, receiving a first channel selection signal to generate a first freezing signal, generating a first channel event signal to a first counting circuit in response to the first freezing signal and the photon pulse signal, and receiving the first channel event signal to generate and count a pulse number of the photon pulse signal received by the first channel; when a rising edge of the photon pulse signal occurs, the first freezing signal is kept at a previous state until a falling edge of the photon pulse signal occurs.

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