公开(公告)号：US20240188841A1

公开(公告)日：2024-06-13

申请号：US18076740

申请日：2022-12-07

Applicant: OmniVision Technologies, Inc.

Inventor： Paul Wickboldt ,  Andreas Suess

IPC: A61B5/0295 ,  A61B5/00 ,  A61B5/021

CPC classification number: A61B5/0295 ,  A61B5/0031 ,  A61B5/02125

Abstract: A device has a first and second PPD sensor configured for placement over an artery; a camera between the first and second PPD sensors; and a processor having memory with firmware for determining pulse transit time (PTT) between the PPD sensors, and determines blood pressure (BP) therefrom using a calibrated conversion from PTT to BP. The firmware also obtains initial and subsequent images of the artery, extracts features, and adjusts calibrated conversion from PTT to BP based upon features extracted from the initial and subsequent images of the artery. In embodiments the processor enhances the initial and subsequent images of the artery using a structured light tomographic enhancement process. A method uses first and second PPD sensors placed over an artery to determine pulse transit time; obtains initial and subsequent images of the artery with a camera; and uses features extracted from the initial and subsequent images of the artery to adjust a calibrated conversion from PTT to BP.

公开(公告)号：US11488414B1

公开(公告)日：2022-11-01

申请号：US17469508

申请日：2021-09-08

Applicant: OmniVision Technologies, Inc.

Inventor： Paul Wickboldt

IPC: G06V40/12 ,  G06V40/13

Abstract: An optical fingerprint sensor with spoof detection using polarization includes a plurality of lenses; an image sensor including a pixel array that includes a plurality of first photodiodes; a line between a center of a light-sensitive surface of each first photodiode and an optical center of each lens forms an optical axis of a plurality of optical axes; at least one apertured baffle-layer positioned between the image sensor and the plurality of lenses and each having a respective plurality of aperture stops, each aperture stop being center-aligned with the optical axis; a plurality of second photodiodes intercalated with the plurality of first photodiodes, wherein each second photodiode is configured to detect light having passed through lens and at least one aperture stop not aligned along optical axis; and at least one polarizing element positioned to polarize electromagnetic energy impinging the plurality of second photodiodes.

公开(公告)号：US11017200B1

公开(公告)日：2021-05-25

申请号：US16776060

申请日：2020-01-29

Applicant: OmniVision Technologies, Inc.

Inventor： Paul Wickboldt

IPC: G06K9/00 ,  H04L29/06 ,  H04M1/02

Abstract: A collimator for under-display fingerprint sensing includes (a) a substrate having opposite facing first and second sides, (b) an array of microlenses disposed on the first surface for focusing light from a fingerprint surface onto a focal plane that is between the array of microlenses and the second side of the substrate such that the light, as projected by the array of microlenses, is diverging when exiting the second side of the substrate, and (c) an array of apertures between the array of microlenses and the substrate, wherein each of the apertures is aligned to and cooperates with a respective one of the microlenses to form a field-of-view-limited lens having a field of view corresponding to a respective local portion of the fingerprint surface.