Patents by Inventor Mengfei Wang

Mengfei Wang 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).

  • Publication number: 20220298420
    Abstract: A multifunctional liquid crystalline photoreactive polymer in which at least some of the polymer side-chains have an ultraviolet photoreactive moiety and at least some of the polymer side-chains have a calamitic mesogenic moiety are provided. At least some of the polymer side-chains have a photo-curable moiety a thermal-curable moiety. In some embodiments, the polymer is in the form of a co-polymer. In some embodiments, the polymer is in the form of a ter-polymer. The polymer is used in applications that require stable birefringement films. Such films are produced from the polymer by subjecting the polymer to ultra-violet light to cause side-chain cross-linking thereby inducing anisotropy. The anisotropy is then amplified by exposing the polymer to an elevated temperature.
    Type: Application
    Filed: March 19, 2021
    Publication date: September 22, 2022
    Inventors: Ryan LI, Lu LU, Junren WANG, Mengfei WANG
  • Publication number: 20220276499
    Abstract: A polarization conversion device includes a geometric phase grating and an angular selective waveplate. The geometric phase grating includes a first liquid crystal layer and is configured to diffract a unpolarized or partially polarized incident light beam into a first light beam and a second light beam (e.g., in two different diffraction orders). The first light beam is characterized by a first polarization state and propagates in a first direction. The second light beam is characterized by a second polarization state and propagates in a second direction. The angular selective waveplate includes a second liquid crystal layer, and functions as a zero or full-wave plate for the first light beam incident in the first direction and a half-wave plate for the second light beam incident in the second direction.
    Type: Application
    Filed: February 14, 2022
    Publication date: September 1, 2022
    Inventors: Junren WANG, Mengfei WANG, Yun-Han LEE, Yuge HUANG, Lu LU, Barry David SILVERSTEIN
  • Publication number: 20220269092
    Abstract: A device includes a light source configured to output a light. The device also includes a display panel including a plurality of subpixel areas. The device also includes a microlens assembly disposed between the light source and the display panel. The microlens assembly includes a first microlens array configured to substantially collimate the light into a first polarized light, and a second microlens array configured to focus the first polarized light as a second polarized light propagating through apertures of the subpixel areas.
    Type: Application
    Filed: December 2, 2021
    Publication date: August 25, 2022
    Inventors: Hyunmin SONG, Fenglin PENG, Yun-Han LEE, Stefanie TAUSHANOFF, Mengfei WANG
  • Publication number: 20220221725
    Abstract: A device includes a light guide. The device also includes a first in-coupling element configured to couple a first input light into the light guide, and a first out-coupling element configured to couple the first input light out of the light guide as a first output light having a first output field of view (“FOV”). The device also includes a second in-coupling element configured to couple a second input light into the light guide. The device further includes a second out-coupling element configured to couple the second input light out of the light guide as a second output light having a second output FOV substantially non-overlapping with the first output FOV. A combination of the first and second output FOVs is larger than at least one of the first or second output FOV, and the first and second input lights have orthogonal polarizations.
    Type: Application
    Filed: March 28, 2022
    Publication date: July 14, 2022
    Inventors: Scott Charles MCELDOWNEY, Babak AMIRSOLAIMANI, Yun-Han LEE, Lu LU, Mengfei WANG, Junren WANG
  • Publication number: 20220212059
    Abstract: A method includes irradiating a layer of photosensitive material with a beam of light having a selected polarization orientation, and scanning the beam of light over an iso-phasic contour of a pattern to be formed in the layer of photosensitive material while maintaining the selected polarization orientation. A computer-implemented method includes receiving, by a computer processor, a stream of sensory signals indicating user heart rate and/or respiration rate, accessing a workout script stored in memory, where the workout script has markup applied thereto that specifies one or more actions to be taken in response to the stream of sensory signals, determining, based on the received stream of sensory signals and the markup applied to the workout script, that the user heart rate and/or respiration rate falls outside a target zone, and adjusting content of the workout script in response to the determination.
    Type: Application
    Filed: March 23, 2022
    Publication date: July 7, 2022
    Inventors: Stephen Choi, Kyle Justin Curts, Mengfei Wang, Charles Liam Goudge
  • Patent number: 11372247
    Abstract: A display device includes a projector and a display that has a first surface and a second surface. The projector is configured to project image light toward the display. The display is configured to output diffused image light from the first surface and to transmit ambient light from the second surface to the first surface. The display device also includes an optical assembly that has a substrate with substantially uniform thickness. The optical assembly is configured to receive the diffused image light and transmit a portion of the diffused image light output from the first surface of the display at a first optical power. The optical assembly is also configured to receive the ambient light and transmit a portion of the ambient light through the optical assembly at a second optical power that is less than the first optical power.
    Type: Grant
    Filed: March 5, 2020
    Date of Patent: June 28, 2022
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Ying Geng, Brian Wheelwright, Jacques Gollier, Yusufu Njoni Bamaxam Sulai, Babak Amirsolaimani, Weichuan Gao, Gang Li, Mengfei Wang, Adrian Travis
  • Publication number: 20220137278
    Abstract: An optical element includes a first birefringent medium layer with orientations of directors of first optically anisotropic molecules spatially varying with a first in-plane pitch and a first vertical pitch. The optical element also includes a second birefringent medium layer with orientations of directors of second optically anisotropic molecules spatially varying with a second in-plane pitch and a second vertical pitch. The second birefringent medium layer is optically coupled with the first birefringent medium layer and configured to reduce a diffraction of a light by the first birefringent medium layer. The first in-plane pitch is substantially the same as the second in-plane pitch, and the second vertical pitch is smaller than the first vertical pitch.
    Type: Application
    Filed: October 29, 2020
    Publication date: May 5, 2022
    Inventors: Yun-Han LEE, Junren WANG, Mengfei WANG, Babak AMIRSOLAIMANI, Lu LU, Scott Charles MCELDOWNEY
  • Patent number: 11314093
    Abstract: A device includes one or more light guides. The device also includes a first in-coupling element configured to couple a first light having a first input field of view (“FOV”) into a first light guide, and a second in-coupling element configured to couple a second light having a second input FOV into a second light guide. The device also includes a first out-coupling element configured to couple the first light out of the first light guide as a first output light having a first output FOV, and a second out-coupling element configured to couple the second light out of the second light guide as a second output light having a second output FOV substantially non-overlapping with the first output FOV. A combination of the first output FOV and the second output FOV is larger than at least one of the first output FOV or the second output FOV.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: April 26, 2022
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Scott Charles McEldowney, Babak Amirsolaimani, Yun-Han Lee, Lu Lu, Mengfei Wang, Junren Wang
  • Patent number: 11300833
    Abstract: An optical diffuser includes optically anisotropic molecules arranged in a predefined configuration such that the optical diffuser diffuses first light having a first polarization and transmits second light having a second polarization that is different from the first polarization upon receiving the second light. In addition to polarization selectivity, the optical diffuser may also exhibit wavelength selectivity and/or incident angle selectivity. A method of diffusing light using the optical diffuser and a method of making the optical diffuser are also disclosed.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: April 12, 2022
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Mengfei Wang, Gang Li, Lu Lu, Yunqi Li
  • Patent number: 11294184
    Abstract: Various embodiments set forth a foveated display system and components thereof. The foveated display system includes a peripheral display module disposed in series with a foveal display module. The peripheral display module is configured to generate low-resolution, large field of view imagery for a user's peripheral vision. The foveal display module is configured to perform foveated rendering in which high-resolution imagery is focused towards a foveal region of the user's eye gaze. The peripheral display module may include a diffuser that is disposed within a pancake lens, which is a relatively compact design. The foveal display module may include a Pancharatnam-Berry Phase grating stack that increases the steering range of a beam-steering device such that a virtual image can be steered to cover an entire field of view visible to the user's eye.
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: April 5, 2022
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Lu Lu, Gang Li, Seungjae Lee, Mengfei Wang
  • Publication number: 20220066212
    Abstract: A device includes one or more light guides. The device also includes a first in-coupling element configured to couple a first light having a first input field of view (“FOV”) into a first light guide, and a second in-coupling element configured to couple a second light having a second input FOV into a second light guide. The device also includes a first out-coupling element configured to couple the first light out of the first light guide as a first output light having a first output FOV, and a second out-coupling element configured to couple the second light out of the second light guide as a second output light having a second output FOV substantially non-overlapping with the first output FOV. A combination of the first output FOV and the second output FOV is larger than at least one of the first output FOV or the second output FOV.
    Type: Application
    Filed: August 27, 2020
    Publication date: March 3, 2022
    Inventors: Scott Charles MCELDOWNEY, Babak AMIRSOLAIMANI, Yun-Han LEE, Lu LU, Mengfei WANG, Junren WANG
  • Patent number: 11215743
    Abstract: An optical device includes a first layer including a first birefringent material having a negative birefringence dispersion property. The optical device also includes a second layer including a second birefringent material having a positive birefringence dispersion property. The first layer and the second layer are structurally patterned to provide at least one predetermined optical function.
    Type: Grant
    Filed: March 5, 2020
    Date of Patent: January 4, 2022
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Junren Wang, Lu Lu, Fenglin Peng, Mengfei Wang, Yun-Han Lee
  • Publication number: 20210405357
    Abstract: A system is provided. The system includes a light source configured to emit an infrared light to illuminate an eye of a user. The system includes a grating disposed facing the eye and including a birefringent material film configured with a uniform birefringence lower than or equal to 0.1. The grating is configured to diffract the infrared light reflected from the eye, and transmit a visible light from a real world environment toward the eye, with a diffraction efficiency less than a predetermined threshold. The system includes an optical sensor configured to receive the diffracted infrared light and generate an image of the eye based on the diffracted infrared light.
    Type: Application
    Filed: September 14, 2021
    Publication date: December 30, 2021
    Inventors: Yun-Han LEE, Lu LU, Mengfei WANG, Fenglin PENG, Junren WANG
  • Patent number: 11209644
    Abstract: A pupil expander spatially modulates decoupling efficiency of light for pupil steering. The pupil expander can be used in a waveguide display, such as part of an artificial-reality display, to reduce power consumption of an optical source.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: December 28, 2021
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Yijing Fu, Lu Lu, Mengfei Wang
  • Publication number: 20210364987
    Abstract: A holographic recording system includes a linear translation stage configured to position a holographic material layer, a light source configured to emit a laser beam, a beam splitting subsystem configured to split the laser beam into a first light beam and a second light beam and direct the second light beam towards the holographic material layer, a spatial-light modulator configured to implement a fringe pattern that modulates the first light beam to generate an object beam, a filter configured to filter the object beam, a demagnification optical subsystem configured to demagnify the object beam, and a switchable grating stack configurable to direct the object beam to a set of directions towards the holographic material layer to interfere with the second light beam. In some embodiments, the switchable grating stack includes a plurality of polarization gratings and/or a plurality of switchable waveplates arranged in a stack.
    Type: Application
    Filed: May 19, 2020
    Publication date: November 25, 2021
    Inventors: Gang LI, Kiseung BANG, Andrew MAIMONE, Changwon JANG, Mengfei WANG, Afsoon JAMALI, Junren WANG
  • Publication number: 20210359989
    Abstract: A computer-implemented method is disclosed. The method includes: receiving, via a communication interface from a client application executing on a first device, a first signal including a request to obtain an access token for accessing a protected resource, the request including a public key associated with an end user; validating the request to obtain the access token; and in response to validating the request: encrypting an authorization code associated with the request using the public key to generate a first code; and transmitting, via the communication interface to the client application on the first device, a second signal including both the access token for accessing the protected resource and the first code.
    Type: Application
    Filed: July 28, 2021
    Publication date: November 18, 2021
    Applicant: The Toronto-Dominion Bank
    Inventors: Milos DUNJIC, Anthony Haituyen NGUYEN, Yubing LIU, Arthur Carroll CHOW, Casey Lyn DOYLE, Richard John Frederick THAKE, Mengfei WANG, Aaron Ashish HUDALI, Gregory Albert KLIEWER, Martin Albert LOZON, Yusbel Garcia DIAZ, Gareth DALY, Masashi KOBAYASHI, Randall John BAST
  • Patent number: 11150468
    Abstract: An optical device and an eye-tracking system to suppress a rainbow effect are provided. The optical device includes a grating. The grating includes at least one substrate and a grating structure coupled to the at least one substrate. The grating structure is configured to diffract an infrared light beam and transmit a visible light beam with a diffraction efficiency less than a predetermined threshold.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: October 19, 2021
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Yun-Han Lee, Lu Lu, Mengfei Wang, Fenglin Peng, Junren Wang
  • Patent number: 11143875
    Abstract: An optical device is provided. The optical device includes a first liquid crystal (“LC”) cell and a second LC cell stacked with the first LC cell. The first and second LC cells are configured to provide a phase retardation to a light transmitted therethrough. The optical device also includes at least one first compensation film disposed between the first LC cell and the second LC cell. The optical device also includes a second compensation film disposed at a first side of the first LC cell opposite to a second side of the first LC cell where the at least one first compensation film is disposed. The optical device also includes a third compensation film disposed at a first side of the second LC cell opposite to a second side of the second LC cell where the at least one first compensation film is disposed.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: October 12, 2021
    Assignee: FACEBOOK TECHNOLOGIES, LLC
    Inventors: Lu Lu, Fenglin Peng, Mengfei Wang, Wai Sze Tiffany Lam, Scott Charles McEldowney
  • Publication number: 20210278582
    Abstract: An optical device includes a first layer including a first birefringent material having a negative birefringence dispersion property. The optical device also includes a second layer including a second birefringent material having a positive birefringence dispersion property. The first layer and the second layer are structurally patterned to provide at least one predetermined optical function.
    Type: Application
    Filed: March 5, 2020
    Publication date: September 9, 2021
    Inventors: Junren WANG, Lu LU, Fenglin PENG, Mengfei WANG, Yun-Han LEE
  • Patent number: 11108762
    Abstract: A method for regulating access to a protected resource is disclosed. The method includes: receiving, via the communication interface from a client application executing on a first device, a first signal including a request to obtain an access token for accessing a protected resource, the request including: a client identifier uniquely identifying the client application; an authorization code for authorizing the client application's access of the protected resource; and a public key associated with the end user; and in response to validating the request: encrypting the authorization code using the public key to generate a first code; and transmitting, via the communication interface to the client application on the first device, a second signal including both an access token for accessing the protected resource and the first code.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: August 31, 2021
    Assignee: The Toronto-Dominion Bank
    Inventors: Milos Dunjic, Anthony Haituyen Nguyen, Yubing Liu, Arthur Carroll Chow, Casey Lyn Doyle, Richard John Frederick Thake, Mengfei Wang, Aaron Ashish Hudali, Gregory Albert Kliewer, Martin Albert Lozon, Yusbel Garcia Diaz, Gareth Daly, Masashi Kobayashi, Randall John Bast