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    Electronic devices having ambient light sensors with hold function
    3.
    发明授权
    Electronic devices having ambient light sensors with hold function 有权

    公开(公告)号：US10984732B2

    公开(公告)日：2021-04-20

    申请号：US16580150

    申请日：2019-09-24

    Applicant: Apple Inc.

    Inventor： Dong Zheng ,  Ali Motamed ,  Anand K. Chamakura

    IPC: G09G3/36 ,  G09G3/34 ,  H03F3/45

    Abstract: An electronic device may have a display with an array of pixels configured to display images for a user. The electronic device may have an ambient light sensor for gathering ambient light information. The ambient light sensor may be at least partially covered by the display. The ambient light sensor may be switched into use during blanking periods when a portion of the display overlapping with the display is temporarily turned off. The ambient light sensor may include a photodetector, a first stage with an amplifier, first and second capacitors selectively coupled across the amplifier, and a second accumulation stage. During blanking time, the first capacitor may integrate photodetector current. During non-blanking, the charge stored in the first capacitor may be transferred to the second accumulation stage while the second capacitor applies an offset voltage to the photodetector to prevent undesired charge injection into the photodetector.

    Electronic Devices Having Ambient Light Sensors With Hold Function
    4.
    发明申请
    Electronic Devices Having Ambient Light Sensors With Hold Function 有权

    公开(公告)号：US20210090509A1

    公开(公告)日：2021-03-25

    申请号：US16580150

    申请日：2019-09-24

    Applicant: Apple Inc.

    Inventor： Dong Zheng ,  Ali Motamed ,  Anand K. Chamakura

    IPC: G09G3/34 ,  H03F3/45

    Abstract: An electronic device may have a display with an array of pixels configured to display images for a user. The electronic device may have an ambient light sensor for gathering ambient light information. The ambient light sensor may be at least partially covered by the display. The ambient light sensor may be switched into use during blanking periods when a portion of the display overlapping with the display is temporarily turned off. The ambient light sensor may include a photodetector, a first stage with an amplifier, first and second capacitors selectively coupled across the amplifier, and a second accumulation stage. During blanking time, the first capacitor may integrate photodetector current. During non-blanking, the charge stored in the first capacitor may be transferred to the second accumulation stage while the second capacitor applies an offset voltage to the photodetector to prevent undesired charge injection into the photodetector.

    OPTICAL SENSORS HAVING AN ABSENCE OF GUARD STRUCTURES BETWEEN ADJACENT PHOTODIODES
    5.
    发明申请
    OPTICAL SENSORS HAVING AN ABSENCE OF GUARD STRUCTURES BETWEEN ADJACENT PHOTODIODES 有权

    公开(公告)号：US20250109970A1

    公开(公告)日：2025-04-03

    申请号：US18671832

    申请日：2024-05-22

    Applicant: Apple Inc.

    Inventor： Anand K. Chamakura ,  Dong Zheng ,  Mieczyslaw M. Dabrowski ,  David D. Dashevsky

    IPC: G01D5/347

    Abstract: An electronic device includes a shared epitaxial structure, an array of photodiodes formed in the shared epitaxial structure, and a readout circuit. The array of photodiodes is disposed between a first axis and a second axis, with the second axis orthogonal to the first axis. The array of photodiodes has an absence of guard structures between adjacent photodiodes. The readout circuit is electrically connected to the array of photodiodes and operable to read out values for different photodiodes or different subsets of photodiodes in the array of photodiodes.

    Electronic Devices With Ambient Flicker Detection
    6.
    发明申请
    Electronic Devices With Ambient Flicker Detection 有权

    公开(公告)号：US20250067595A1

    公开(公告)日：2025-02-27

    申请号：US18613515

    申请日：2024-03-22

    Applicant: Apple Inc.

    Inventor： Anand K. Chamakura ,  Stephen N. Sweet ,  Ali Motamed ,  Dong Zheng ,  Jianjun Guo ,  Chau H. Nguyen

    IPC: G01J1/46 ,  G01J1/42 ,  G01J1/44

    Abstract: An electronic device may have a sensor to measure ambient flicker. The sensor may be a sigma-delta converter. The flicker may be calculated based on the voltage output of the sigma-delta converter and the number of times the sigma-delta converter is triggered during a predetermined period, thereby reducing the voltage output. In particular, a fast Fourier transform (FFT) may be used on these values to determine the flicker. If desired, filtering and/or non-uniform sampling may be incorporated to avoid aliasing. Additionally or alternatively, a Lomb-Scargle spectral analysis may be used to prevent the attenuation of the measured flicker signals. As an alternative to using a sigma-delta converter to determine ambient flicker, a folding capacitive transimpedance amplifier (C-TIA) circuit or a circuit with an analog to digital converter and digital filter may be used to measure the ambient flicker.

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