公开(公告)号：US11598919B2

公开(公告)日：2023-03-07

申请号：US17063190

申请日：2020-10-05

Applicant: Meta Platforms Technologies, LLC

Inventor： Yingfei Jiang ,  Lu Lu ,  Hao Yu

IPC: G02B6/293 ,  G02B27/01 ,  F21V8/00

Abstract: An optical assembly may include a waveguide and a Bragg grating configured to couple light into or out of the waveguide. The Bragg grating may include a plurality of layer pairs, wherein at least one layer pair comprises a first material having a first refractive index and a second layer having a second refractive index, and wherein properties of the Bragg grating are selected so that the Bragg grating exhibits a substantially similar diffractive efficiency and diffraction angle for light of at least two colors.

公开(公告)号：US11567326B1

公开(公告)日：2023-01-31

申请号：US17085654

申请日：2020-10-30

Applicant: Meta Platforms Technologies, LLC

Inventor： Afsoon Jamali ,  Yang Zhao ,  Brian Wheelwright ,  Douglas Robert Lanman ,  Marina Zannoli ,  Ian Erkelens ,  Yusufu Njoni Bamaxam Sulai ,  Lu Lu ,  Jacques Gollier

IPC: G02B27/01 ,  G02C7/08 ,  G02F1/1343 ,  G02B27/00

Abstract: A device includes a light source configured to emit an image light. The device also includes an optical assembly configured to direct the image light to an eye-box of the device. The optical assembly includes a first optical element portion configured to focus a first portion of the image light propagating through the first optical element portion. The optical assembly also includes a second optical element portion configured to focus a second portion of the image light propagating through the second optical element portion. The second optical element portion includes a liquid crystal (“LC”) lens having an adjustable optical power.

公开(公告)号：US11561507B2

公开(公告)日：2023-01-24

申请号：US16273068

申请日：2019-02-11

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Oleg Yaroshchuk ,  Wai Sze Tiffany Lam ,  Scott Charles McEldowney ,  Lu Lu

IPC: G03H1/02 ,  G03H1/04 ,  G03H1/18

Abstract: The invention relates to a method of creation of three-dimensional alignment patterns that includes providing a layer of optically recordable and polarization sensitive material having a thickness that is greater than, or equal to, a predefined thickness, and concurrently illuminating the optically recordable medium with two coherent beam of same or different polarization with predetermined angle between the beams such that the said beams impinge from the same side or from the opposite sides upon the layer of the recordable material. The invention further relates to polarization volume holograms based on the said alignment patterns and polarization holographic element including a single layer or a stack of several layers of optically recordable materials containing single or multiple polarization volume holograms.

公开(公告)号：US12259616B1

公开(公告)日：2025-03-25

申请号：US18498001

申请日：2023-10-30

Applicant: Meta Platforms Technologies, LLC

Inventor： Nicholas John Diorio, Jr. ,  Mengfei Wang ,  Yuge Huang ,  Kai-Han Chang ,  Lu Lu ,  Xiayu Feng

IPC: G02F1/13363 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/1343

Abstract: A device includes a plurality of electrode layers. The device also includes a birefringent medium layer disposed between the plurality of electrode layers. The device also includes at least one alignment structure disposed at a surface of the birefringent medium layer. The birefringent medium layer includes liquid crystal molecules arranged in a plurality of helical twist structures having a helical axis. The plurality of electrode layers are configured to generate an electric field within the birefringent medium layer, and the liquid crystal molecules are aligned via the electric field to be titled with respect to the helical axis.

公开(公告)号：US12078806B2

公开(公告)日：2024-09-03

申请号：US17712894

申请日：2022-04-04

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Lu Lu

IPC: G02F1/29 ,  G02B5/30 ,  G02B27/00 ,  G02B27/01 ,  G02B27/28 ,  G02B27/42 ,  G02F1/1335 ,  G02F1/13363 ,  G02F1/139 ,  G02F1/1347

CPC classification number: G02B27/0172 ,  G02B5/3016 ,  G02B27/0025 ,  G02B27/286 ,  G02B27/288 ,  G02B27/4261 ,  G02F1/133504 ,  G02F1/133526 ,  G02F1/133528 ,  G02F1/13363 ,  G02F1/1393 ,  G02F1/292 ,  G02B2027/011 ,  G02B2027/0116 ,  G02B2027/0174 ,  G02F1/133541 ,  G02F1/133638 ,  G02F1/1347 ,  G02F1/294 ,  G02F2203/05 ,  G02F2203/24 ,  G02F2413/02

Abstract: A near eye display (NED) includes multiple PBP optical elements combined with one or more C-plates to improve optical angular performance. The PBP optical elements may be configured for beam steering or for focusing light to a point. A C-plate may reduce or eliminate an undesirable polarization phase shift introduced by the PBP optical elements to angular, off-axis light. Birefringence of the PBP optical elements produces such a polarization phase shift. A C-plate provides an additional polarization phase shift that is opposite to the extra polarization phase shift by the PBP optical elements. Thus, the additional polarization phase shift by the C-plate at least partially reduces the phase shift by the PBP element.

公开(公告)号：US12066648B2

公开(公告)日：2024-08-20

申请号：US17322354

申请日：2021-05-17

Applicant: Meta Platforms Technologies, LLC

Inventor： Lu Lu ,  Hsien-Hui Cheng ,  Junren Wang ,  Mengfei Wang

IPC: G02B5/30 ,  G02B5/32 ,  G03H1/02

CPC classification number: G02B5/3083 ,  G02B5/32 ,  G03H1/0248 ,  G03H2223/20

Abstract: A device is provided. The device includes a first polarization hologram element configured to operate as a half-wave plate for a first light having a first wavelength, and as a full-wave plate for a second light having a second wavelength. The device also includes a second polarization hologram element stacked with the first polarization hologram, and configured to operate as the half-wave plate for the second light and as the full-wave plate for the first light. The first polarization hologram element is configured to forwardly diffract or transmit the first light depending on a handedness of the first light. The second polarization hologram element is configured to forwardly diffract or transmit the second light depending on a handedness of the second light.

公开(公告)号：US11774753B1

公开(公告)日：2023-10-03

申请号：US17531301

申请日：2021-11-19

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Giuseppe Calafiore ,  Ningfeng Huang ,  Andrew Maimone ,  Andrew Ouderkirk ,  Hee Yoon Lee ,  Maxwell Parsons ,  Scott Charles McEldowney ,  Babak Amirsolaimani ,  Pasi Saarikko ,  Wanli Chi ,  Alexander Koshelev ,  Barry David Silverstein ,  Lu Lu ,  Wai Sze Tiffany Lam ,  Gang Li ,  Stephan Lutgen ,  Francois Gerard Franck Olivier ,  David Massoubre

IPC: G02B27/00 ,  G02B27/44 ,  G02B27/01 ,  G02B27/09 ,  G02B27/10

CPC classification number: G02B27/0081 ,  G02B27/0172 ,  G02B27/0944 ,  G02B27/1086 ,  G02B27/44 ,  G02B2027/0145 ,  G02B2027/0152

Abstract: A waveguide assembly is provided. The waveguide assembly includes a pair of pupil-replicating waveguides. The first pupil-replicating waveguide is configured for receiving an input beam of image light and providing an intermediate beam comprising multiple offset portions of the input beam. The second pupil-replicating waveguide is configured for receiving the intermediate beam from the first pupil-replicating waveguide and providing an output beam comprising multiple offset portions of the intermediate beam. The input beam may be expanded by the waveguide assembly in such a manner that pupil gaps are reduced or eliminated.

公开(公告)号：US11754870B2

公开(公告)日：2023-09-12

申请号：US17944183

申请日：2022-09-13

Applicant: Meta Platforms Technologies, LLC

Inventor： Junren Wang ,  Yuge Huang ,  Yun-Han Lee ,  Lu Lu

IPC: G02F1/1334 ,  G02F1/1337 ,  G02F1/13363

CPC classification number: G02F1/13342 ,  G02F1/13363 ,  G02F1/133707

Abstract: A device is provided. The device includes a polarization hologram polymer layer having a wavy surface, an optic axis of the polarization hologram polymer layer being configured with a spatially varying orientation in a first predetermined in-plane direction. The device also includes a compensation layer disposed at the wavy surface of the polarization hologram polymer layer and configured to compensate for the wavy surface in shape.

公开(公告)号：US11714320B2

公开(公告)日：2023-08-01

申请号：US17535753

申请日：2021-11-26

Applicant: Meta Platforms Technologies, LLC

Inventor： Fenglin Peng ,  Lu Lu ,  Jacques Gollier

IPC: G02F1/1343 ,  G02F1/141 ,  G02F1/03 ,  G02F1/13363 ,  G02F1/137

CPC classification number: G02F1/134363 ,  G02F1/0311 ,  G02F1/133632 ,  G02F1/141 ,  G02F1/13775 ,  G02F1/133638

Abstract: A waveplate is provided. The waveplate includes a first liquid crystal (“LC”) layer including LC molecules that are in-plane switchable by an external field to switch the waveplate between states of different phase retardances. The waveplate includes a second LC layer and a third LC layer sandwiching the first LC layer. Azimuthal angles of effective refractive index ellipsoids of the second LC layer and the third LC layer are different.

公开(公告)号：US11693265B2

公开(公告)日：2023-07-04

申请号：US17330422

申请日：2021-05-26

Applicant: Meta Platforms Technologies, LLC

Inventor： Hsien-Hui Cheng ,  Yang Zhao ,  Hannah Noble ,  Fenglin Peng ,  Lu Lu

IPC: G02F1/1347 ,  G02F1/01 ,  G02B27/01 ,  G02F1/139

CPC classification number: G02F1/0136 ,  G02B27/0172 ,  G02F1/139 ,  G02F1/1347 ,  G02B2027/0178

Abstract: A polarization modulator includes a first liquid crystal cell and a second liquid crystal cell. The first liquid crystal cell has a first type of liquid crystals configured to rotate an optical axis of light parallel to a first plane of the first liquid crystal cell. The second liquid crystal cell is configured to receive the light from the first liquid crystal cell. The second liquid crystal cell has a second type of liquid crystals configured to rotate the optical axis of the light perpendicular to a second plane of the second liquid crystal cell.