Patents by Inventor Wai Sze Tiffany Lam
Wai Sze Tiffany Lam has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11947117Abstract: A waveguide display includes a waveguide transparent to visible light, a first volume Bragg grating (VBG) on the waveguide and characterized by a first refractive index modulation, and a second reflection VBG on the waveguide and including a plurality of regions characterized by different respective refractive index modulations. The first reflection VBG is configured to diffract display light in a first wavelength range and a first field of view (FOV) range such that the display light in the first wavelength range and the first FOV range propagates in the waveguide through total internal reflection to the plurality of regions of the second reflection VBG. The plurality of regions of the second reflection VBG are configured to diffract the display light in different respective wavelength ranges within the first wavelength range and the first FOV range.Type: GrantFiled: October 7, 2021Date of Patent: April 2, 2024Assignee: Meta Platforms Technologies, LLCInventors: Wanli Chi, Dominic Meiser, Yang Yang, Wai Sze Tiffany Lam, Pasi Saarikko, Ningfeng Huang
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Patent number: 11927758Abstract: 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.Type: GrantFiled: November 17, 2022Date of Patent: March 12, 2024Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Wai Sze Tiffany Lam, Wanli Chi, Dominic Meiser, Yang Yang, Ningfeng Huang
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Publication number: 20240069346Abstract: 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.Type: ApplicationFiled: November 17, 2022Publication date: February 29, 2024Applicant: Meta Platforms Technologies, LLCInventors: Wai Sze Tiffany LAM, Wanli CHI, Dominic MEISER, Yang YANG, Ningfeng HUANG
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Patent number: 11885974Abstract: A device is provided. The device includes a waveguide configured to output a first light having a first polarization to a first side of the waveguide and a second light having the first polarization to a second side of the waveguide. The device also includes an optical element assembly disposed at the first side of the waveguide and configured to convert the first light having the first polarization into a third light having a second polarization, and output the third light toward the waveguide. The device further includes a polarizer disposed at the second side of the waveguide and configured to transmit the third light having the second polarization, and block the second light having the first polarization.Type: GrantFiled: October 22, 2020Date of Patent: January 30, 2024Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Wai Sze Tiffany Lam, Ying Geng, Scott Charles McEldowney
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Patent number: 11885967Abstract: 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.Type: GrantFiled: September 17, 2021Date of Patent: January 30, 2024Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Wai Sze Tiffany Lam, Yang Yang, Wanli Chi, Dominic Meiser
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Publication number: 20240012261Abstract: 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.Type: ApplicationFiled: December 6, 2022Publication date: January 11, 2024Inventors: Wai Sze Tiffany Lam, Jian Xu, Wanli Chi
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Patent number: 11852949Abstract: A hybrid lens is disclosed including optically coupled varifocal lens and adaptive lens. The varifocal lens is configured for varying optical power of the hybrid lens, and an adaptive lens includes a voltage-controlled element for varying optical power of the adaptive lens in coordination with varying the optical power of the varifocal lens and responsive to variation of the optical power of the hybrid lens, for lessening an optical aberration of the hybrid lens. The hybrid lens may be used in head-mounted displays e.g. for lessening a vergence-accommodation conflict.Type: GrantFiled: February 16, 2021Date of Patent: December 26, 2023Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Lu Lu, Wai Sze Tiffany Lam, Yusufu Njoni Bamaxam Sulai
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Patent number: 11846779Abstract: 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.Type: GrantFiled: October 6, 2021Date of Patent: December 19, 2023Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Afsoon Jamali, Wai Sze Tiffany Lam, Brian Wheelwright, Lu Lu, Douglas Robert Lanman
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Publication number: 20230314716Abstract: According to examples, a system for particular emission of wavelength bands using one or more directed wavelength emission components is described. The system may include a wearable eyewear arrangement having a lens assembly. The lens assembly may include a projector to project display light associated with an image and a waveguide for propagating the display light to enable viewing of the image by a user. The projector may include an illumination source component to generate the display light and a directed wavelength emission component coupled to the illumination source component to filter the display light according to one or more filtering characteristics.Type: ApplicationFiled: March 29, 2022Publication date: October 5, 2023Applicant: Meta Platforms Technologies, LLCInventors: Dominic MEISER, Yang YANG, Wanli CHI, Wai Sze Tiffany LAM
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Patent number: 11774753Abstract: 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.Type: GrantFiled: November 19, 2021Date of Patent: October 3, 2023Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: 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
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Patent number: 11774758Abstract: A waveguide display includes a waveguide, three input gratings configured to couple display light in different respective colors into the waveguide, one or more first middle gratings configured to receive and redirect the display light from the three input gratings, a second middle grating configured to diffract, at two or more regions of the second middle grating, the display light from the one or more first middle gratings, and an output grating configured to couple the display light from each of the two or more regions of the second middle grating out of the waveguide at two or more regions of the output grating.Type: GrantFiled: February 24, 2021Date of Patent: October 3, 2023Assignee: Meta Platforms Technologies, LLCInventors: Yang Yang, Wanli Chi, Wai Sze Tiffany Lam, Dominic Meiser
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Patent number: 11733521Abstract: 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.Type: GrantFiled: February 17, 2021Date of Patent: August 22, 2023Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Wanli Chi, Yang Yang, Wai Sze Tiffany Lam, Dominic Meiser
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Publication number: 20230258938Abstract: 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 configuration for propagating the display light to an eyebox. The waveguide configuration may include a volume Bragg grating (VBG) component for propagating the display light from a projector to an eyebox. The VBG component may include at least one tilt adjusted grating facilitated by adjustment in an original grating vector (k) direction of a grating by a pre-determined value. The tilt adjusted grating may facilitate to mitigate a rainbow effect observable in a gazing direction of the eyebox. The rainbow effect may be mitigated by modification of a rainbow ghost path away from the gazing direction without affecting propagation of the image pertaining to the display light.Type: ApplicationFiled: February 17, 2022Publication date: August 17, 2023Applicant: META PLATFORMS TECHNOLOGIES, LLCInventors: Wai Sze Tiffany Lam, Yang Yang, Dominic Meiser, Wanli Chi
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Publication number: 20230258937Abstract: 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.Type: ApplicationFiled: February 15, 2022Publication date: August 17, 2023Applicant: Meta Platforms Technologies, LLCInventors: Wai Sze Tiffany LAM, Yang YANG, Dominic MEISER, Wanli CHI
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Publication number: 20230251489Abstract: 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.Type: ApplicationFiled: March 31, 2023Publication date: August 10, 2023Inventors: Yang Zhao, Afsoon Jamali, Junren Wang, Wai Sze Tiffany Lam, Lu Lu, Douglas Robert Lanman
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Publication number: 20230244185Abstract: 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.Type: ApplicationFiled: January 24, 2023Publication date: August 3, 2023Applicant: Meta Platforms Technologies, LLCInventors: Wai Sze Tiffany LAM, Jian XU, Ying GENG, Wanli CHI
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Publication number: 20230236415Abstract: According to examples, a system for image generation and delivery in a display device using two-dimensional (2D) field of view (FOV) expander is described. In addition, the system may include a first lens a first lens assembly having a first projector to propagate first display light associated with a first image and a first two-dimensional (2D) expander including a first waveguide for propagating the first display light to a first eye of a user and a second lens assembly having a second projector to propagate second display light associated with a second image and a second two-dimensional (2D) expander having a second waveguide for propagating the second display light to a first eye of a user.Type: ApplicationFiled: January 26, 2022Publication date: July 27, 2023Applicant: Meta Platforms Technologies, LLCInventors: Yang YANG, Wai Sze Tiffany LAM, Dominic MEISER, Wanli CHI
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Patent number: 11709358Abstract: A waveguide display includes a waveguide and a staircase structure coupled to the waveguide. The waveguide includes a first substrate, a second substrate, and a holographic material layer between the first substrate and the second substrate. The holographic material layer includes a first grating and a second grating. The staircase structure is positioned on top of at least a portion of the first grating but not on top of the second grating. The staircase structure includes an input grating that is on top of the first grating and is configured to couple display light into the waveguide. The first grating is configured to redirect the display light coupled into the waveguide by the input grating towards the second grating.Type: GrantFiled: February 24, 2021Date of Patent: July 25, 2023Assignee: META PLATFORMS TECHNOLOGIES, LLCInventors: Yang Yang, Wanli Chi, Wai Sze Tiffany Lam, Dominic Meiser
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Publication number: 20230213772Abstract: 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.Type: ApplicationFiled: March 13, 2023Publication date: July 6, 2023Applicant: Meta Platforms Technologies, LLCInventors: Wai Sze Tiffany Lam, Yang Yang, Dominic Meiser, Wanli Chi
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Publication number: 20230213761Abstract: 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, in which the waveguide may include a plurality of gratings through which the first display light is sequentially propagated and in which at least one of the plurality of gratings is oriented to propagate the display light to a next grating while reducing an appearance of a ghost image of the image on the eyebox.Type: ApplicationFiled: January 5, 2022Publication date: July 6, 2023Applicant: Meta Platforms Technologies, LLCInventors: Wai Sze Tiffany LAM, Yang Yang, Dominic Meiser, Wanli Chi