公开(公告)号：US12196976B2

公开(公告)日：2025-01-14

申请号：US17850663

申请日：2022-06-27

Applicant: Meta Platforms Technologies, LLC

Inventor： Yang Yang ,  Jianbo Zhao ,  Peter Johnsen

IPC: G02B27/01 ,  G02B6/42

Abstract: An apparatus, system, and method for a waveguide system may be used to support eye tracking in a head mounted display (HMD). The waveguide system may be positioned in a user's field of view and within a lens assembly of the HMD to capture light that is reflected from an eye. The waveguide system may have a number of multi-directional gratings configured to direct light to an out-coupling grating. The multi-directional gratings include first and second in-coupling diffraction gratings disposed in a waveguide. The first and second in-coupling diffraction gratings are oriented to direct incident light in multiple directions within the waveguide towards the out-coupling diffraction grating.

公开(公告)号：US12099190B2

公开(公告)日：2024-09-24

申请号：US17549394

申请日：2021-12-13

Applicant: Meta Platforms Technologies, LLC

Inventor： Sihui He ,  Maxwell Parsons ,  Fenglin Peng ,  Miaomiao Xu ,  Yang Yang ,  Yu Shi ,  Dianmin Lin

IPC: G02B27/01 ,  G02B5/18 ,  G02B5/32 ,  G02B6/42 ,  G02B27/00 ,  F21V8/00

CPC classification number: G02B27/0172 ,  G02B5/1842 ,  G02B5/32 ,  G02B6/4206 ,  G02B6/4213 ,  G02B27/0081 ,  G02B6/0018 ,  G02B6/0036 ,  G02B2027/0174 ,  G02B2027/0178

Abstract: A waveguide is provided. The waveguide includes a substrate having two outer surfaces for propagating a beam of light in the substrate by reflecting the beam from the two outer surfaces. The waveguide includes at least one polarization volume hologram (PVH) grating to couple light in and/or out of the waveguide. The PVH grating may be a multi-layer PVH grating with graded birefringence.

公开(公告)号：US11885967B2

公开(公告)日：2024-01-30

申请号：US17478679

申请日：2021-09-17

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Yang Yang ,  Wanli Chi ,  Dominic Meiser

IPC: G02B27/01 ,  G02B27/28 ,  G02B5/30 ,  F21V8/00 ,  G02B5/18 ,  G02B6/34 ,  G02B27/00 ,  G02B27/09

CPC classification number: G02B27/0172 ,  G02B5/1833 ,  G02B5/1842 ,  G02B5/3083 ,  G02B6/005 ,  G02B6/0026 ,  G02B6/34 ,  G02B27/0081 ,  G02B27/0093 ,  G02B27/0944 ,  G02B27/286 ,  G02B2027/0118 ,  G02B2027/0123 ,  G02B2027/0174 ,  G02B2027/0178

Abstract: A waveguide display includes a substrate transparent to visible light, a first grating on the substrate and configured to couple display light into or out of the substrate, and a phase structure on the substrate and configured to change a polarization state of the display light after or before the display light reaches the first grating. The first grating is characterized by a polarization-dependent diffraction efficiency. The first grating includes, for example, a surface-relief grating or a volume Bragg grating.

公开(公告)号：US20230204959A1

公开(公告)日：2023-06-29

申请号：US17830339

申请日：2022-06-02

Applicant: Meta Platforms Technologies, LLC

Inventor： Yang Yang ,  Sascha Hallstein ,  Jianbo Zhao ,  Peter Johnsen

IPC: G02B27/01

CPC classification number: G02B27/0172 ,  G02B2027/0125 ,  G02B2027/0174

Abstract: An apparatus, system, and method for a waveguide system may be used to support eye tracking in a head mounted display (HMD). The waveguide system may be positioned in a user’s field of view and within a lens assembly of the HMD to capture light that is reflected from an eye. The waveguide system may include a waveguide, a first diffraction grating, and a second diffraction grating. The first diffraction grating may be configured to in-couple light of a first wavelength into the waveguide, and the second diffraction grating may be configured to in-couple light of a second wavelength. The first and second diffraction gratings operate together to detect light reflections from an eyebox region.

公开(公告)号：US20240345388A1

公开(公告)日：2024-10-17

申请号：US18134202

申请日：2023-04-13

Applicant: Meta Platforms Technologies, LLC

Inventor： Yang Yang ,  Mohamed Tarek Ahmed El-Haddad ,  Junjie Hu

IPC: G02B27/00 ,  F21V8/00 ,  G06F3/01 ,  G06T7/73 ,  H04N23/56

CPC classification number: G02B27/0093 ,  G02B6/0026 ,  G02B6/005 ,  G06F3/013 ,  G06T7/73 ,  H04N23/56 ,  G06T2207/30201

Abstract: A waveguide system in a lens assembly of a head mounted device may be used to support eye tracking operations. The waveguide system includes a waveguide, an input coupler, and an output coupler. The input coupler is disposed in the waveguide, and the input coupler is configured to in-couple light into the waveguide. The output coupler is disposed in the waveguide and is configured to out-couple the light from the waveguide. The output coupler includes at least one trapezoidal portion to condition the depth of field for the waveguide system. The output coupler may have two (dual) trapezoidal portions that are similar to the shape of a bowtie or hourglass to configure the depth of field of the waveguide system along a particular direction (e.g., the y-axis). The bowtie shape of the output coupler provides uniform in-coupling of light from the input coupler along a range of angles.

公开(公告)号：US20240319513A1

公开(公告)日：2024-09-26

申请号：US18126367

申请日：2023-03-24

Applicant: Meta Platforms Technologies, LLC

Inventor： Mohamed Tarek Ahmed El-Haddad ,  Yang Yang ,  Junjie Hu

IPC: G02B27/01 ,  G02B27/42 ,  G06F3/01 ,  G06T7/70 ,  H04N23/55

CPC classification number: G02B27/0179 ,  G02B27/0172 ,  G02B27/4205 ,  G06F3/013 ,  G06T7/70 ,  H04N23/55 ,  G02B2027/0178 ,  G02B2027/0187

Abstract: A lens assembly for a head mounted device may be configured to in-couple light from an eyebox region using a number of waveguide systems coupled to a number of image sensors, for example, for one or both lens assemblies in the head mounted device. The waveguide systems may be positioned in the lens assembly. The waveguide systems may be configured to in-couple light from various portions of the eyebox region. The waveguide systems may be configured to couple the light from a center region of the lens assembly to a number of peripheral regions of the lens assembly. The image sensors may be optically coupled to the waveguide systems and may be configured to receive portions of the light from the waveguide systems.

公开(公告)号：US11927758B1

公开(公告)日：2024-03-12

申请号：US17989159

申请日：2022-11-17

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Wanli Chi ,  Dominic Meiser ,  Yang Yang ,  Ningfeng Huang

IPC: G09G5/00 ,  F21V8/00 ,  G02B27/01

CPC classification number: G02B27/0172 ,  G02B6/0035 ,  G02B2027/0112 ,  G02B2027/0125

Abstract: A display system includes a wearable eyewear arrangement with a projector for propagating display light associated with an image and a waveguide for propagating the display light to an eye box. The waveguide includes volume Bragg gratings (VBGs), which may be in groups of three or more gratings with same horizontal period allowing each color to be coupled out from the waveguide by the same type of grating, thus, at the same angle, reducing or eliminating image blurriness and ghost images while allowing a smaller size waveguide. A 100% reflective mirror or mirror array is used for broad spectrum reflection into the waveguide for light input. Selection of two or more wavelengths for each color at the projector provides spectral response matching to the waveguide allowing wider field of view (FOV) coverage for the entire wavelength spectrum.

公开(公告)号：US11733521B2

公开(公告)日：2023-08-22

申请号：US17178016

申请日：2021-02-17

Applicant: Meta Platforms Technologies, LLC

Inventor： Wanli Chi ,  Yang Yang ,  Wai Sze Tiffany Lam ,  Dominic Meiser

IPC: G02B27/01 ,  G02B6/02

CPC classification number: G02B27/0172 ,  G02B6/0208 ,  G02B2027/0123 ,  G02B2027/0174

Abstract: A waveguide display includes a plurality of grating layers, the plurality of grating layers characterized by two or more different base refractive indices and including a set of volume Bragg gratings (VBGs). Each VBG of the set of VBGs is configured to diffract display light in a different respective field-of-view (FOV) and wavelength range. The set of VBGs includes a plurality of groups of VBGs. VBGs in each respective group of the plurality of groups of VBGs are characterized by a same grating period and include at least one VBG in each grating layer of the plurality of grating layers.

公开(公告)号：US11624926B1

公开(公告)日：2023-04-11

申请号：US17569381

申请日：2022-01-05

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Yang Yang ,  Dominic Meiser ,  Wanli Chi

IPC: G02B27/01 ,  G02B27/00

Abstract: According to examples, a display system may include a disparity sensing detector, collection optics, and a first lens assembly. The first lens assembly may include a first projector to output a first display light associated with a first image and a first waveguide for propagating the first display light to the collection optics, in which the collection optics is to direct the first display light to the disparity sensing detector. The display system may also include a second lens assembly including a second projector to output a second display light associated with a second image and a second waveguide for propagating the second display light to the collection optics, in which the collection optics is to direct the second display light to the disparity sensing detector.

公开(公告)号：US12085717B2

公开(公告)日：2024-09-10

申请号：US17672418

申请日：2022-02-15

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Yang Yang ,  Dominic Meiser ,  Wanli Chi

IPC: G02B27/01 ,  F21V8/00

CPC classification number: G02B27/0172 ,  G02B6/0038 ,  G02B6/0053 ,  G02B2027/0118 ,  G02B2027/0123 ,  G02B2027/0178

Abstract: According to examples, a display system may include a wearable eyewear arrangement that may include a lens assembly having a projector to propagate display light associated with an image. The lens assembly may also include a waveguide for propagating the display light to an eyebox. The waveguide may include a combination of a volume Bragg grating (VBG) component and a partial reflective component that are oriented in a pre-determined configuration to reflect or propagate the display light to maximize a coverage in field of view (FOV) at the eyebox, while minimizing at least one of a ghost image or an intercepting optical lines pattern.