公开(公告)号：US20230359041A1

公开(公告)日：2023-11-09

申请号：US18301012

申请日：2023-04-14

Applicant: Meta Platforms Technologies, LLC

Inventor： Changwon JANG ,  Miaomiao XU, JR.

IPC: G02B27/01 ,  F21V8/00

CPC classification number: G02B27/0172 ,  G02B6/0035 ,  G02B2027/0123

Abstract: A device is provided. The device includes a light guide coupled with an in-coupling element at an input portion of the light guide and an out-coupling element at an output portion of the light guide. The device also includes a volume grating disposed at a portion of the light guide and configured to diffract a light via Bragg diffraction. The volume grating is configured with at least one of a predetermined spectral Bragg selectivity variation or a predetermined angular Bragg selectivity variation along one or more dimensions in a film plane of the volume grating.

公开(公告)号：US20230305489A1

公开(公告)日：2023-09-28

申请号：US17702379

申请日：2022-03-23

Applicant: Meta Platforms Technologies, LLC

Inventor： Changwon JANG ,  Richard WEBB ,  Liang SHI ,  Lei XIAO ,  Changil KIM ,  Douglas Robert LANMAN

IPC: G03H1/02 ,  G03H1/04 ,  H04N19/91 ,  H04N19/124 ,  G06T19/00

CPC classification number: G03H1/024 ,  G03H1/04 ,  H04N19/91 ,  H04N19/124 ,  G06T19/006 ,  G03H2001/0088

Abstract: According to examples, a learning based, end-to-end compression system may include an encoder, which may receive a complex hologram image and encode a latent code for a real component and an imaginary component of the hologram image. The system may also include a quantizer to quantize the latent code and a transform block, which may entropy-code the quantized latent code to obtain a compressed image. The system may further include a generator to decode the compressed image and a discriminator, which may classify the decoded image to obtain an uncompressed image. In case of holographic video input, the encoder may encode a frame to obtain a standard compressed frame and a residual to a latent code. The generator may decode the standard compressed frame and the latent code to obtain a reconstructed residual, and the discriminator may combine the uncompressed standard frame and the reconstructed residual.

公开(公告)号：US20250067982A1

公开(公告)日：2025-02-27

申请号：US18811361

申请日：2024-08-21

Applicant: Meta Platforms Technologies, LLC

Inventor： Changwon JANG ,  Te HU ,  Jianing YAO ,  Dongmin YANG ,  Ajit NINAN ,  Alexandre CHAPIRO

IPC: G02B27/01 ,  G02B5/20 ,  G02B27/00 ,  G02B27/09

Abstract: A head-mounted display device employs controllable aperture projection for uniformity of a waveguide display within a field of view and eyebox domain. A waveguide-based display to control pupil replication density may comprise an image panel to provide light, a projection lens to receive and focus the light from the image panel, a variable aperture to pass the focused light in a controllable manner, and a waveguide to project the focused light passed through by the variable aperture onto an eye box, wherein the variable aperture is positioned at an entrance of the waveguide.

公开(公告)号：US20230314846A1

公开(公告)日：2023-10-05

申请号：US17710383

申请日：2022-03-31

Applicant: Meta Platforms Technologies, LLC

Inventor： Zhimin SHI ,  Changwon JANG ,  Afsoon JAMALI

IPC: G02F1/01 ,  G02B27/01 ,  G06F1/16

CPC classification number: G02F1/0102 ,  G02B27/0172 ,  G02F1/0136 ,  G06F1/163 ,  G02B2027/0178 ,  G02F2203/07 ,  G02F2203/50

Abstract: According to examples, apparatuses, systems, and methods for reconfiguring a multifunctional display panel are described. A display panel may include a polarization-dependent light modulation layer to modulate at least a phase of an incident light and to generate a modulated light. The modulated light is a function of at least one of a polarization state, a phase, or an amplitude of the incident light. One or more switchable polarization optical elements are operatively coupled to the polarization-dependent optical modulation layer. The one or more switchable polarization optical elements are to select an operational to mode of the display panel by adjusting the polarization state of the incident light to select the modulation applied to the incident light to generate the modulated light.

公开(公告)号：US20230185236A1

公开(公告)日：2023-06-15

申请号：US17954326

申请日：2022-09-28

Applicant: Meta Platforms Technologies, LLC

Inventor： Yun-Han LEE ,  Changwon JANG ,  Hyunmin SONG ,  Chulwoo OH ,  Matthieu Charles Raoul LEIBOVICI

IPC: G03H1/04 ,  G03H1/02

CPC classification number: G03H1/0402 ,  G03H1/0248 ,  G03H2222/31 ,  G03H2001/0439 ,  G03H2223/20 ,  G03H2223/22 ,  G03H2250/42

Abstract: A system includes a light outputting element configured to output a first beam propagating toward a beam interference zone from a first side of the beam interference zone. The system also includes a wavefront shaping assembly disposed at a second side of the beam interference zone and including a polarization hologram, the wavefront shaping assembly being configured to reflect the first beam as a second beam propagating toward the beam interference zone from the second side. The first beam and the second beam are linearly polarized beams, and are configured to interfere with one another within the beam interference zone to generate an interference pattern that is recordable in a recording medium layer disposed in the beam interference zone.

公开(公告)号：US20230029109A1

公开(公告)日：2023-01-26

申请号：US17381891

申请日：2021-07-21

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Zhimin SHI ,  Yongdan HU ,  Changwon JANG

IPC: G02F1/1335 ,  G02F1/1343 ,  G02B27/01 ,  G02B27/00 ,  G03H1/22

Abstract: Various embodiments set forth optical patterning systems. In some embodiments, an optical patterning system includes multiple liquid crystal (LC) layers and a substrate including circuitry that is connected to each of the LC layers. Each LC layer is independently addressable, via connections to the circuitry in the substrate, to modulate a different degree of freedom (DOF) of light, such as an amplitude, a phase, a distinct polarization component, or an amplitude or a phase of a polarization component of the light. In addition, each LC layer can be configured to operate in a non-resonant mode, in which light passes through the LC layer a single time, or in a resonant mode, in which light bounces back and forth between reflective layers multiple times to enhance the interaction with the LC layer.

公开(公告)号：US20230152578A1

公开(公告)日：2023-05-18

申请号：US17526359

申请日：2021-11-15

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Changwon JANG ,  Olivier MERCIER ,  Gregory Olegovic ANDREEV ,  Gang LI ,  Liliana Ruiz DIAZ

IPC: G02B27/00 ,  G02B5/32 ,  H04N13/344 ,  H04N13/383 ,  H04N9/31

CPC classification number: G02B27/0093 ,  G02B5/32 ,  H04N13/344 ,  H04N13/383 ,  H04N9/3173

Abstract: A method includes projecting, with a holographic optical element, a first view of an eye toward an imaging device, and projecting, with the holographic optical element, a second view of the eye, distinct from the first view of the eye, toward the imaging device so that the first view and the second view of the eye are concurrently received by the imaging device. An eye tracking device for performing the method, a holographic optical element used for the method, and a method of making the holographic optical element are also disclosed.