-
公开(公告)号：US20210103159A1
公开(公告)日：2021-04-08
申请号：US16594534
申请日：2019-10-07
Applicant: OmniVision Technologies, Inc.
Inventor： Shih-Hsin HSU , Jau-Jan DENG , Wei-Ping CHEN
Abstract: A passive speckle-suppressing diffuser includes a microlens array for diffusing a light field originating from one or more coherent light beams, and a diffractive optical element mounted in series with the microlens array and having a pixelated thickness distribution, characterized by a spatial variation across the diffractive optical element, to impose a spatially varying phase shift on the light field. The pixelated thickness distribution may be configured such that the spatially varying phase shift suppresses speckle of the light field while minimizing introduction of distinct diffraction structure. A method for passive speckle-suppressing diffusion a light field originating from one or more coherent light beams may include refracting the light field, through a microlens array, to diffuse the light field, and imposing a spatially varying phase shift on the light field to decohere the light field without introducing any first-order diffraction components deflected beyond angle spread introduced by the microlens array.
-
公开(公告)号：US20230306778A1
公开(公告)日：2023-09-28
申请号：US17702675
申请日：2022-03-23
Applicant: OmniVision Technologies, Inc.
Inventor： Shih-Hsin HSU , Jau-Jan DENG
CPC classification number: G06V40/1318 , G02B1/11 , G02B5/208 , G02B3/0075
Abstract: An under-display optical fingerprint sensors employing microlens arrays (MLAs) and an opaque aperture layer includes high aspect-ratio metal aperture structures for efficient angular signal filtering and stray light control. Instead of relying on one or more opaque aperture baffle-layers, embodiments disclosed herein utilize an image sensor's inherent metal layers for filtering signals originated from unwanted angular ranges and blocking undesired stray light could achieve similar or better performance with simplified process flow and lower cost. Layers from the sensors' inherent metal layers are brought into the sensing area on purpose to form the high aspect-ratio metal aperture structure. The metal layers in the sensing area may include apertures aligned to apertures in the opaque layer, and may also be grounded.
-
公开(公告)号：US20230072103A1
公开(公告)日：2023-03-09
申请号：US17469461
申请日：2021-09-08
Applicant: OmniVision Technologies, Inc.
Inventor： Paul Wickboldt , Jau-Jan Deng , Shih-Hsin HSU
Abstract: An optical fingerprint sensor with spoof detection includes a plurality of lenses, an image sensor including a pixel array that includes a plurality of first photodiodes and a plurality of second photodiodes, and at least one apertured baffle-layer having a plurality of aperture stops, wherein each second photodiode is configured to detect light having passed through a lens and at least one aperture stop not aligned with the lens along an optical axis. A method for detecting spoof fingerprints detected using an optical fingerprint sensor includes detecting large-angle light incident on a plurality of anti-spoof photodiodes, wherein the plurality of anti-spoof photodiodes is interleaved with a plurality of imaging photodiodes, determining an angular distribution of light based at least in part one the large-angle light, and detecting spoof fingerprints based at least in part on the angular distribution of light.
-
-
Search Results
3
records
(took 0.011 seconds)
