Biometric sensing device with discrete ultrasonic transducers

    公开(公告)号:US09824254B1

    公开(公告)日:2017-11-21

    申请号:US14590821

    申请日:2015-01-06

    Applicant: Apple Inc.

    Abstract: A biometric sensing system includes discrete ultrasonic transducers, a first electrode layer disposed over a first surface of the discrete ultrasonic transducers, and a second electrode layer disposed over a second surface of the discrete ultrasonic transducers. The first electrode layer may be a sheet of conductive material that is a common ground connection for the discrete ultrasonic transducers. Alternatively, the first electrode layer can be formed with discrete electrode elements, with a discrete electrode element disposed over the first surface of a discrete ultrasonic transducer. The second electrode layer may be formed with discrete electrode elements, with a discrete electrode element disposed over the second surface of one ultrasonic transducer. At least one integrated circuit can be attached and connected to one of the electrode layers. The integrated circuit includes drive circuits and sense circuits for the discrete ultrasonic transducers.

    Active sensing element for acoustic imaging systems

    公开(公告)号:US09747488B2

    公开(公告)日:2017-08-29

    申请号:US14823945

    申请日:2015-08-11

    Applicant: Apple Inc.

    CPC classification number: G06K9/0002

    Abstract: An acoustic fingerprint imaging system having a plurality of acoustic elements, each acoustic element including a transducer, and independent drive and sense circuitry is disclosed. Drive circuitry may require higher voltage than low voltage sense circuitry. Many embodiments described herein include a ground shifting controller to apply a voltage bias to the low voltage sense circuitry during a drive operation, in order to prevent electrical damage to the sense circuitry.

    Electronic device including device ground coupled finger coupling electrode and array shielding electrode and related methods
    15.
    发明授权
    Electronic device including device ground coupled finger coupling electrode and array shielding electrode and related methods 有权
    电子器件包括器件地耦合指状电极和阵列屏蔽电极及相关方法

    公开(公告)号:US09581628B2

    公开(公告)日:2017-02-28

    申请号:US13886520

    申请日:2013-05-03

    Applicant: Apple Inc.

    Abstract: An electronic device may include a housing and circuitry carried by the housing and having a device ground associated therewith. The electronic device may also include an array of biometric finger sensing pixel electrodes and an array shielding electrode outside the array of biometric finger sensing pixels. A finger coupling electrode may be outside the array shielding electrode and coupled to the device ground. The electronic device may also include drive circuitry capable of generating a drive signal for the array of biometric finger sensing pixel electrodes and a compensating drive signal for the array shielding electrode.

    Abstract translation: 电子设备可以包括由壳体承载并具有与其相关联的设备地面的壳体和电路。 电子设备还可以包括生物测定手指感测像素电极阵列和在生物测定手指感测像素阵列之外的阵列屏蔽电极。 手指耦合电极可以在阵列屏蔽电极之外并且耦合到器件地。 电子设备还可以包括能够产生生物测量手指感测像素电极阵列的驱动信号的驱动电路和阵列屏蔽电极的补偿驱动信号。

    Moisture-insensitive optical touch sensors

    公开(公告)号:US11775021B2

    公开(公告)日:2023-10-03

    申请号:US17404783

    申请日:2021-08-17

    Applicant: Apple Inc.

    CPC classification number: G06F1/1656 G01L1/246 G06F3/0421 G06F2203/04109

    Abstract: An electronic device may have an optical touch sensor that is insensitive to the presence of moisture. The display may present images through a display cover layer. A light source may illuminate an external object such as a user's finger when the object contacts a surface of the display cover layer. This creates scattered light that may be detected by an array of light sensors. A metasurface grating may be used to couple light from the light source into the display cover layer at an angle such that total internal reflection within the display cover layer is sustained across the display cover layer even when the display cover layer is immersed in water or otherwise exposed to moisture. Additional metasurface gratings may be formed on the display cover layer to redirect light propagating within the display cover layer away from edges that might otherwise defeat total internal reflection.

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