公开(公告)号：US20240345389A1

公开(公告)日：2024-10-17

申请号：US18608831

申请日：2024-03-18

Applicant: Meta Platforms Technologies, LLC

Inventor： Jian XU ,  Xiang LI ,  Miaomiao XU ,  Xingzhou TU ,  Shaobai LI ,  Xiayu FENG ,  Wanli CHI ,  Wai Sze Tiffany LAM

IPC: G02B27/00

CPC classification number: G02B27/0093 ,  G02B6/0016 ,  G02B6/0036 ,  G02B6/0076

Abstract: A system is provided. The system includes a light source configured to emit a infrared (“IR”) light for illuminating an object. The system also includes a waveguide imaging assembly including a waveguide, an in-coupling element disposed at a first portion of the waveguide, an out-coupling element disposed at a second portion of the waveguide, and an optical sensor disposed facing the out-coupling element. The in-coupling element is configured to couple the IR light reflected by the object into the waveguide, the waveguide is configured to guide the IR light to propagate toward the out-coupling element through total internal reflection, and the out-coupling element is configured to couple the IR light out of the waveguide toward the optical sensor. The optical sensor is configured to generate a tracking signal of the object based on the IR light output from the waveguide.

公开(公告)号：US20230244185A1

公开(公告)日：2023-08-03

申请号：US18100698

申请日：2023-01-24

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany LAM ,  Jian XU ,  Ying GENG ,  Wanli CHI

IPC: G03H1/04 ,  G03F7/20

CPC classification number: G03H1/0402 ,  G03F7/70408 ,  G03H2260/12 ,  G03H2223/13

Abstract: According to examples, a method for phase plate fabrication may be described herein. The method may include providing an interferometer configuration to generate a hologram of a plurality of pinholes. In some examples, the interferometer configuration includes a substrate for photopolymer attachment, a photopolymer having a predetermined thickness, and an exposure mask with a plurality of pinholes. The method may also include exposing the photopolymer with collimated light, via a laser source, through the exposure mask with a plurality of pinholes, wherein the collimated light passes through the exposure mask itself to create a collimated beam, and the plurality of pinholes of the exposure mask to create a spherical wavefront. The collimated beam and the spherical wavefront may help generate the hologram on the photopolymer for use as a phase plate for improved light transmissivity in display systems.

公开(公告)号：US20250060522A1

公开(公告)日：2025-02-20

申请号：US18781931

申请日：2024-07-23

Applicant: Meta Platforms Technologies, LLC

Inventor： Jian XU ,  Joshua COBB

IPC: F21V8/00 ,  G02B27/01

Abstract: A system includes a waveguide configured to guide an in-coupled image light to propagate inside the waveguide via total internal reflection. The system also includes an in-coupling element configured to couple an input image light into the waveguide as the in-coupled image light. The system also includes a plurality of partial reflectors at least partially embedded inside the waveguide. The system further includes an in-plane relay at least partially embedded inside the waveguide and disposed between the in-coupling element and the partial reflectors. The in-plane relay includes a plurality of cylindrical reflectors. The in-plane relay is configured to convert the in-coupled image light received from the in-coupling element into a relayed image light.

公开(公告)号：US20230244023A1

公开(公告)日：2023-08-03

申请号：US18128497

申请日：2023-03-30

Applicant: Meta Platforms Technologies, LLC

Inventor： Jian XU ,  Xingzhou TU ,  Ying GENG ,  Jacques GOLLIER

IPC: F21V8/00 ,  G02B27/01 ,  G02F1/1335 ,  G03F7/20

CPC classification number: G02B6/005 ,  G02B27/0172 ,  G02F1/133514 ,  G03F7/70191 ,  G02B6/0066 ,  G02F1/133528 ,  G02F2201/52 ,  G02B2027/0112

Abstract: According to examples, a phase plate may include a transparent substrate and a photopolymer layer attached to the transparent substrate. The photopolymer layer may adjust a backlight via a phase adjustment and focusing. The phase plate may focus a plurality of red, green, and blue components of the backlight onto respective red, green, and blue subpixels of a thin-film-transistor (TFT) layer deposited thereon. A distance between the photopolymer layer of the phase plate and the plurality of red, green, and blue subpixels of the thin-film-transistor (TFT) layer may be in a range from about 200 μm to about 500 μm. In some examples, the phase plate may be part of a liquid crystal display (LCD) apparatus along with a red, green, blue (RGB) laser to provide backlight; a grating light guide to transmit the backlight; and a liquid crystal display (LCD) layer on the thin-film-transistor (TFT) layer.

公开(公告)号：US20230148959A1

公开(公告)日：2023-05-18

申请号：US17528135

申请日：2021-11-16

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Jian XU ,  Guohua WEI

IPC: A61B5/00 ,  A61B5/026 ,  G02B27/01

CPC classification number: A61B5/6803 ,  A61B5/0261 ,  A61B5/4064 ,  G02B27/0176 ,  A61B2562/0238 ,  G02B2027/0178

Abstract: A head-mounted display device includes a display panel positioned to provide an image toward an eye of a wearer of the head-mounted display device; one or more light sources positioned to provide illumination light toward a head of the wearer; and one or more light detectors for receiving a portion of the illumination light that has been scattered by the head of the wearer so that one or more characteristics associated with a blood flow in the head of the wearer are determined based on the received portion of the illumination light. A method of determining one or more characteristics associated with a blood flow in a head of a wearer of the head-mounted display device is also described.

公开(公告)号：US20250137927A1

公开(公告)日：2025-05-01

申请号：US17979226

申请日：2022-11-02

Applicant: Meta Platforms Technologies, LLC

Inventor： Jian XU

IPC: G01N21/47

Abstract: A system is provided. The system includes a light source configured to emit a probing beam to illuminate an optical element. The system also includes an image sensor configured to be rotatable around the optical element within a predetermined rotation range. The system also includes a controller configured to control the image senor to move to a plurality of angular sub-ranges of the predetermined rotation range to receive a plurality of scattered beams output from the optical element. The image sensor is configured to generate a plurality of sets of speckle pattern image data based on the received scattered beams. The sets of speckle pattern image data provide two-dimensional (“2D”) spatial information of speckles.

公开(公告)号：US20230296510A1

公开(公告)日：2023-09-21

申请号：US17733985

申请日：2022-04-29

Applicant: Meta Platforms Technologies, LLC

Inventor： Jian XU

IPC: G01N21/47

CPC classification number: G01N21/4788 ,  G01N2021/479 ,  G01N2021/4704 ,  G01N2021/1765

Abstract: A system includes a light source configured to emit a probing beam to illuminate an optical element, and a rotating structure to which the optical element is mounted. The system also includes a controller configured to control the rotating structure to rotate to change a tilt angle of the optical element with respect to a propagation direction of the probing beam. The system also includes an image sensor configured to receive one or more scattered beams output from the optical element illuminated by the probing beam, and generate a plurality of sets of speckle pattern image data when the optical element is arranged at a plurality of tilt angles within a predetermined tilting range. The controller is configured to process the plurality of sets of speckle pattern image data to determine respective weights of volumetric scattering and surface scattering in an overall scattering of the optical element.