公开(公告)号：US20210019488A1

公开(公告)日：2021-01-21

申请号：US16741390

申请日：2020-01-13

Applicant: InvenSense, Inc.

Inventor： Quy CHAU ,  Mei-Lin CHAN

IPC: G06K9/00

Abstract: An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, wherein the two-dimensional array of ultrasonic transducers is substantially flat, a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers, and an array controller configured to control activation of ultrasonic transducers during an imaging operation. During the imaging operation, the array controller is configured to control a transmission frequency of activated ultrasonic transducers during the imaging operation, wherein a plurality of transmission frequencies are used during the imaging operation to account for an impact of an interference pattern caused by the non-uniform thickness of the contact layer, and is configured to capture at least one fingerprint image using the plurality of transmission frequencies.

公开(公告)号：US20220067324A1

公开(公告)日：2022-03-03

申请号：US17454796

申请日：2021-11-12

Applicant: InvenSense, Inc.

Inventor： Quy CHAU ,  Mei-Lin CHAN

IPC: G06K9/00

Abstract: An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, wherein the two-dimensional array of ultrasonic transducers is substantially flat, a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers, and an array controller configured to control activation of ultrasonic transducers during an imaging operation. During the imaging operation, the array controller is configured to control a transmission frequency of activated ultrasonic transducers during the imaging operation, wherein a plurality of transmission frequencies are used during the imaging operation to account for an impact of an interference pattern caused by the non-uniform thickness of the contact layer, and is configured to capture at least one fingerprint image using the plurality of transmission frequencies.

公开(公告)号：US20210019487A1

公开(公告)日：2021-01-21

申请号：US16741030

申请日：2020-01-13

Applicant: InvenSense, Inc.

Inventor： Quy CHAU ,  Mei-Lin CHAN ,  Xiaoyue JIANG

IPC: G06K9/00 ,  G06F3/043

Abstract: An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, wherein the two-dimensional array of ultrasonic transducers is substantially flat, a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers, and an array controller configured to control activation of ultrasonic transducers during an imaging operation for imaging a plurality of pixels at a plurality of positions within the two-dimensional array of ultrasonic transducers. For imaging a pixel of the plurality of pixels, the array controller is configured to activate a first subset of ultrasonic transducers of the two-dimensional array of ultrasonic transducers to generate an ultrasonic beam directed to a contact surface of the contact layer, and activate a second subset of ultrasonic transducers of the two-dimensional array of ultrasonic transducers to receive a reflected ultrasonic beam, wherein the second subset of ultrasonic transducers is at a location within the two-dimensional array of ultrasonic transducers to account for a local angle between the two-dimensional array of ultrasonic transducers and the contact surface where the ultrasonic beam interacts with the contact surface.