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    Analog operation circuit for operating pulse width signals outputted from pixel circuit
    63.
    发明授权
    Analog operation circuit for operating pulse width signals outputted from pixel circuit 有权

    公开(公告)号：US11546540B2

    公开(公告)日：2023-01-03

    申请号：US17672028

    申请日：2022-02-15

    Applicant: PixArt Imaging Inc.

    Inventor： Ren-Chieh Liu ,  Chih-Huan Wu ,  Yi-Hsien Ko ,  Han-Chi Liu

    IPC: H04N5/3745 ,  H01L27/146 ,  H04N5/355 ,  H04N5/374

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

    IMAGE IDENTIFICATION METHOD APPLIED TO A JOYSTICK
    64.
    发明申请
    IMAGE IDENTIFICATION METHOD APPLIED TO A JOYSTICK 有权

    公开(公告)号：US20220066497A1

    公开(公告)日：2022-03-03

    申请号：US17521883

    申请日：2021-11-09

    Applicant: PixArt Imaging Inc.

    Inventor： Chao-Chien Huang ,  Yen-Hung Wang ,  Yi-Chung Chen ,  Hui-Hsuan Chen ,  Yi-Hsien Ko

    IPC: G05G9/047

    Abstract: An image identification method is used to eliminate accumulated error of operation of a joystick. The joystick has an optical sensor adapted to analyze a movement of a plurality of identification dots disposed on a stick body. The image identification method includes receiving a series of detection images, setting a first identification dot of the plurality of identification dots as being a reference identification dot, and setting a second identification dot of the plurality of identification dos as being the reference identification dot and cancelling the first identification dot as being the reference identification dot when the first identification dot is near a border of the detection image. A position change of the reference identification dot in the series of detection images is used for identifying a control status of the joystick.

    JOYSTICK
    67.
    发明申请
    JOYSTICK 有权

    公开(公告)号：US20210157353A1

    公开(公告)日：2021-05-27

    申请号：US17069824

    申请日：2020-10-13

    Applicant: PixArt Imaging Inc.

    Inventor： Chao-Chien Huang ,  Yen-Hung Wang ,  Yi-Chung Chen ,  Hui-Hsuan Chen ,  Yi-Hsien Ko

    IPC: G05G9/047

    Abstract: A joystick includes a casing, a stick body and an optical sensor. The casing has a hole. The stick body is movably disposed on the casing via the hole. The stick body includes a pressing portion, an indication portion and an identification pattern. The indication portion is connected to the pressing portion and inserts into the hole. A sunken structure is formed on a bottom of the indication portion. The identification pattern is disposed on an inner surface of the sunken structure. The optical sensor is disposed inside the casing and faces the sunken structure, and adapted to analyze a movement of the identification pattern to identify a control status of the stick body.

    Access control system and light guide assembly thereof
    68.
    发明授权
    Access control system and light guide assembly thereof 有权

    公开(公告)号：US10955969B2

    公开(公告)日：2021-03-23

    申请号：US16546155

    申请日：2019-08-20

    Applicant: PIXART IMAGING INC.

    Inventor： Chao-Chien Huang ,  Hung-Ching Lai ,  Ting-Yang Chang ,  Yi-Hsien Ko

    IPC: G06F3/042 ,  F21V8/00

    Abstract: A light-guide assembly and an access control system are provided. The light-guide assembly is used as an interface for touch input. The light-guide assembly includes a light-guide element and a light source disposed on a lateral surface of the light-guide element. The light source emits a first light with a first wavelength. The light-guide element has an upper surface, a lower surface, and an inner layer that is made of a light-transmissive material. The first light enters the light-guide element through the lateral surface and propagates inside the light-guide element for reacting to the touch event occurring on the upper surface. A verification data used in an access control system is formed when the touch event is sensed and identified. A light-activation element of the assembly activates the first light propagating inside the light-guide element and produces a second light that is used to provide a visual effect.

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