公开(公告)号：US11686942B2

公开(公告)日：2023-06-27

申请号：US16730293

申请日：2019-12-30

Applicant: Meta Platforms Technologies, LLC

Inventor： Yang Zhao ,  Afsoon Jamali ,  Junren Wang ,  Wai Sze Tiffany Lam ,  Lu Lu ,  Douglas Robert Lanman

IPC: G02F1/137 ,  G02B27/01 ,  G03B13/36

CPC classification number: G02B27/0172 ,  G02F1/13718 ,  G03B13/36

Abstract: A display system includes a source of unpolarized image light, and a stack of polarization-selective optical elements operable to switchably convert the unpolarized image light into two orthogonally polarized light beams, each of which being switchable in at least one beam characteristic. An output polarizer selects one of the two orthogonally polarized light beams for providing to a user. A depolarizer may be disposed between an electronic display emitting polarized light and the stack. The depolarizer may be in the form of an LC bilayer with randomized in-plane optic axis.

公开(公告)号：US20250085558A1

公开(公告)日：2025-03-13

申请号：US18955754

申请日：2024-11-21

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Jian Xu ,  Wanli Chi

IPC: G02B27/09 ,  G02B5/18 ,  G02B5/32 ,  G02F1/1335

Abstract: A headset for enhanced reality applications comprises a light source to provide a collimated beam and a beam expander. The beam expander includes a first optical element that receives the collimated beam and provides a first expanded beam in a first direction, a second optical element that receives the first expanded beam in the first direction and provides a second expanded beam in a second direction, and a display. The display includes a liquid crystal layer to receive the second expanded beam and a pixelated electrode layer to activate a selected portion of the liquid crystal layer and provide a pixelated image to a user of the headset.

公开(公告)号：US20250035928A1

公开(公告)日：2025-01-30

申请号：US18677206

申请日：2024-05-29

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Wanli Chi ,  Marvin Dion Alim ,  Alexander Sohn ,  Jacques Gollier

IPC: G02B27/01 ,  G02B5/30

Abstract: A system comprising (1) an eyewear device dimensioned to be worn by a user and (2) a compact beam expander incorporated in the eyewear device, the compact beam expander comprising (A) a first light-spreading element configured to diffract light received from a light source, (B) a second light-spreading element configured to further diffract the light, and (C) a pixel element that is positioned proximate to the second light-spreading element and configured to direct the light toward a lens that focuses the light for an eye of the user. Various other apparatuses, systems, and methods are also disclosed.

公开(公告)号：US12189134B2

公开(公告)日：2025-01-07

申请号：US18062533

申请日：2022-12-06

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Jian Xu ,  Wanli Chi

IPC: G02B27/09 ,  G02B5/18 ,  G02B5/32 ,  G02F1/1335

Abstract: A beam expander for a display in an enhanced reality headset is provided. The beam expander includes a first optical element configured to receive a collimated beam input and to provide a first expanded beam in a first direction, and a second optical element configured to receive the first expanded beam in the first direction and to provide a second expanded beam in a second direction to a display for an enhanced reality headset. An enhanced reality headset and a method for making a beam expander therein with the above features are also provided.

公开(公告)号：US20240288684A1

公开(公告)日：2024-08-29

申请号：US18587339

申请日：2024-02-26

Applicant: Meta Platforms Technologies, LLC

Inventor： Wai Sze Tiffany Lam ,  Wanli Chi ,  Jian Xu

IPC: G02B26/10 ,  G02B5/18 ,  G02B27/01 ,  G02B27/09 ,  G02B27/44 ,  G06T19/00

CPC classification number: G02B26/106 ,  G02B5/18 ,  G02B27/0172 ,  G02B27/0944 ,  G02B27/44 ,  G06T19/006

Abstract: An apparatus of the subject technology includes a light source to generate a light beam, a first grating illuminated by the light beam, and a second grating optically coupled to the first grating. The first grating performs a first diffraction to expand the light beam in a first dimension to form a first beam. The second grating performs a second diffraction to expand the first beam in a second dimension to provide a backlight for a display device.

公开(公告)号：US11846779B2

公开(公告)日：2023-12-19

申请号：US17495750

申请日：2021-10-06

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Afsoon Jamali ,  Wai Sze Tiffany Lam ,  Brian Wheelwright ,  Lu Lu ,  Douglas Robert Lanman

IPC: G02B27/01 ,  G02B5/18 ,  G02B5/30 ,  G02B26/10 ,  G02B27/00 ,  G02F1/29

CPC classification number: G02B27/0172 ,  G02B5/1828 ,  G02B5/1842 ,  G02B5/3083 ,  G02B26/106 ,  G02B27/0093 ,  G02F1/29 ,  G02B2027/0123 ,  G02B2027/0178 ,  G02F1/294 ,  G02F2203/07

Abstract: An optical assembly includes a plurality of successive optical stages that are configured to transmit light at a variable overall optical power by configuring one or more stages of the successive optical stages. A respective optical stage of the successive optical stages includes an active optical element that is configurable to be in a first state at a first time and a second state at a second time that is distinct from the first time. The active optical element, in the first state, has a first respective optical power for light of a first polarization and a second respective optical power, that is different from the first respective optical power, for light of a second polarization that is orthogonal to the first polarization. The active optical element, in the second state, has a third optical power for light of the first polarization and light of the second polarization.

公开(公告)号：US20230213772A1

公开(公告)日：2023-07-06

申请号：US18120742

申请日：2023-03-13

Applicant: Meta Platforms Technologies, LLC

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

IPC: G02B27/01 ,  G02B27/00

CPC classification number: G02B27/0172 ,  G02B27/0093 ,  G02B27/0101 ,  G02B2027/014 ,  G02B2027/0178

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：US11624917B2

公开(公告)日：2023-04-11

申请号：US16840119

申请日：2020-04-03

Applicant: Meta Platforms Technologies, LLC

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

IPC: G02B27/01 ,  F21V8/00 ,  G02B27/00 ,  G02B27/44 ,  H04N9/31 ,  G02B1/11 ,  G02B27/42

Abstract: A waveguide display includes a waveguide and a grating coupler configured to couple display light into or out of the waveguide. The grating coupler includes at least a first grating layer and a second grating layer arranged in a stack. The first grating layer is characterized by a first thickness and includes a first transmission VBG configured to diffract display light of a first wavelength from a first field of view. The second grating layer is characterized by a second thickness greater than the first thickness and includes a second transmission VBG configured to diffract display light of the first wavelength from a second field of view greater than the first field of view.

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.