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    Optical sensor device having sensing pixels and self-powered pixels
    31.
    发明授权
    Optical sensor device having sensing pixels and self-powered pixels 有权

    公开(公告)号：US12117884B2

    公开(公告)日：2024-10-15

    申请号：US18222468

    申请日：2023-07-16

    Applicant: PixArt Imaging Inc.

    Inventor： Guo-Zhen Wang

    IPC: G06F1/3234 ,  G06F3/03 ,  G06F3/0354 ,  G06F3/038

    CPC classification number: G06F1/3259 ,  G06F3/0317 ,  G06F3/0354 ,  G06F3/03543 ,  G06F3/038 ,  Y02D10/00

    Abstract: A sensor device includes an image sensing array, a frame buffer, a first read line, a second read line and an energy accumulator. The image sensing array is configured to sense reflected light from a working surface and includes a plurality of sensing pixels and a plurality of self-powered pixels. The sensing pixels respectively output image data according to the sensed reflected light. The self-powered pixels respectively output photocurrent according to the sensed reflected light. The first read line is coupled between the sensing pixels and the frame buffer. The second read line is coupled between the self-powered pixels and the frame buffer. The energy accumulator stores electrical energy of the photocurrent via a charge path between the self-powered pixels and the energy accumulator.

    Single photon avalanche diode based optical sensor, event-based vision sensor and operating method thereof
    32.
    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.

    ANALOG OPERATION CIRCUIT FOR PROCESSING PIXEL DATA IN ANALOG PHASE
    33.
    发明公开
    ANALOG OPERATION CIRCUIT FOR PROCESSING PIXEL DATA IN ANALOG PHASE 审中-公开

    公开(公告)号：US20240340553A1

    公开(公告)日：2024-10-10

    申请号：US18747498

    申请日：2024-06-19

    Applicant: PixArt Imaging Inc.

    Inventor： REN-CHIEH LIU ,  CHIH-HUAN WU ,  YI-HSIEN KO ,  HAN-CHI LIU

    IPC: H04N25/772 ,  H01L27/146

    CPC classification number: H04N25/772 ,  H01L27/14643

    Abstract: There is provided a pixel circuit for performing analog operation including a photodiode, a first circuit, a second circuit and an operation circuit. Within a first interval, the photodiode detects first light energy to be stored in the first circuit. Within a second interval, the photodiode detects second light energy to be stored in the second circuit. Within an operation interval, the first circuit outputs a first detection signal according to the first light energy and outputs a second detection signal according to the second light energy for being calculated by the operation circuit.

    IMAGE SENSOR WITH CONTROLLED SPAD AVALANCHE
    36.
    发明公开
    IMAGE SENSOR WITH CONTROLLED SPAD AVALANCHE 审中-公开

    公开(公告)号：US20240314465A1

    公开(公告)日：2024-09-19

    申请号：US18677949

    申请日：2024-05-30

    Applicant: PixArt Imaging Inc.

    Inventor： TSO-SHENG TSAI

    IPC: H04N25/75 ,  H01L27/146 ,  H01L31/107 ,  H04N25/76

    CPC classification number: H04N25/75 ,  H01L27/14612 ,  H01L27/14643 ,  H04N25/76 ,  H01L31/107

    Abstract: There is provided an image sensor employing an avalanche diode. The image sensor includes a plurality of pixel circuits arranged in a matrix, a plurality of pulling circuits and a global current source circuit. Each of the plurality of pixel circuits includes a single photon avalanche diode (SPAD) and a floating diffusion. Each of the plurality of pulling circuits is arranged corresponding to one pixel circuit column. The global current source circuit is used to form a current mirror with each of the plurality of pulling circuits. The floating diffusion is used to record a voltage of one photon event detected by the SPAD in an exposure period.

    Avalanche diode based detection device
    38.
    发明授权
    Avalanche diode based detection device 有权

    公开(公告)号：US12085677B2

    公开(公告)日：2024-09-10

    申请号：US17735547

    申请日：2022-05-03

    Applicant: PixArt Imaging Inc.

    Inventor： Tso-Sheng Tsai

    IPC: G01S7/487 ,  G01S7/4865 ,  G01S17/04

    CPC classification number: G01S7/487 ,  G01S7/4865 ,  G01S17/04

    Abstract: There is provided a detection device including a light source, an avalanche diode, a first counter, a second counter and a processor. The light source emits light within a first interval, and is turned off within a second interval, a third interval and a fourth interval. The avalanche diode detects photons corresponding to the first interval, second, third and fourth intervals to trigger avalanche events. The first counter performs up-counting on the avalanche events in the first interval and performs down-counting on the avalanche events in the third interval to generate a first count value. The second counter performs up-counting on the avalanche events in the second interval and performs down-counting on the avalanche events in the fourth interval to generate a second count value. The processor calculates a time-of-flight according to the first count value and the second count value.

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