Patents by Inventor Pasi Saarikko

Pasi Saarikko 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: 20200116995
    Abstract: A waveguide is provided for conveying image light. The waveguide includes an input port for receiving a first beam of image light carrying an image in a wavelength band. A first diffraction grating of the waveguide includes a plurality of volume Bragg gratings (VBGs) configured to expand the first beam along a first axis and to redirect the first beam towards a second diffraction grating of the waveguide. The second diffraction grating includes a plurality of VBGs configured to receive the first beam from the first diffraction grating and to out-couple different portions of the first wavelength band of the first beam along a second axis, thereby expanding the first beam along the second axis for observation of the image by a user.
    Type: Application
    Filed: October 15, 2018
    Publication date: April 16, 2020
    Inventors: Wanli Chi, Hee Yoon Lee, Pasi Saarikko
  • Patent number: 10613268
    Abstract: A manufacturing system for fabricating self-aligned grating elements with a variable refractive index includes a patterning system, a deposition system, and an etching system. The manufacturing system performs a lithographic patterning of one or more photoresists to create a stack over a substrate. The manufacturing system performs a conformal deposition of a protective coating on the stack. The manufacturing system performs a deposition of a first photoresist of a first refractive index on the protective coating. The manufacturing system performs a removal of the first photoresist to achieve a threshold value of first thickness. The manufacturing system performs a deposition of a second photoresist of a second refractive index on the first photoresist. The second refractive index is greater than the first refractive index. The manufacturing system performs a removal of the second photoresist to achieve a threshold value of second thickness to form a portion of an optical grating.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: April 7, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Matthew E. Colburn, Giuseppe Calafiore, Matthieu Charles Raoul Leibovici, Erik Shipton, Pasi Saarikko
  • Patent number: 10598941
    Abstract: A head-mounted display (HMD) presented herein comprises an electronic display, an optical assembly with a dynamic optical axis component (DOAC), an eye tracker and a controller. The electronic display is configured to emit image light. The eye tracker is configured to determine a gaze vector of a user wearing the HMD. The DOAC is positioned in front of the electronic display and refracts the image light received from the electronic display. The controller provides emission instructions to the DOAC to dynamically move an optical axis of the DOAC to align the optical axis with the determined gaze vector. The optical assembly directs the image light refracted by the DOAC to an eye box of the HMD corresponding to a location of an eye of the user. An optical error associated with the refracted image light directed to the eye box is reduced.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: March 24, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Wanli Chi, Pasi Saarikko, Lu Lu, Kevin James MacKenzie, Yijing Fu
  • Patent number: 10585287
    Abstract: A waveguide display is used for presenting media to a user. The waveguide display includes light source assembly, an output waveguide, and a controller. The light source assembly includes one or more projectors projecting an image light at least along one dimension. The output waveguide includes a waveguide body with two opposite surfaces. The output waveguide includes a first grating receiving an image light propagating along an input wave vector, a second grating, and a third grating positioned opposite to the second grating and outputting an expanded image light with wave vectors matching the input wave vector. The controller controls the scanning of the one or more source assemblies to form a two-dimensional image.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: March 10, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Publication number: 20200058266
    Abstract: A wearable display device and a calibration method for the wearable display device are provided. The wearable display device or its component(s) may exhibit optical throughput dependent on beam angle or beam coordinate at the eyebox. The linear or angular dependencies of throughput may be accounted for when generating an image to be displayed, to lessen or offset these dependencies during operation of the wearable display.
    Type: Application
    Filed: August 14, 2018
    Publication date: February 20, 2020
    Inventors: Yijing Fu, Pasi Saarikko, Hee Yoon Lee, Wanli Chi
  • Publication number: 20200041791
    Abstract: A multilayer grating is a diffraction grating that includes a plurality of layers. The plurality of layers arranged to form a 2-dimensional grating, the layers including at least a first patterned layer and a second patterned layer. The first patterned layer includes a plurality of different materials that are arranged in a first pattern such that the first patterned layer has a first index profile. The second patterned layer includes a plurality of different materials that are arranged in a second pattern such that the second patterned layer has a second index profile that is inverted relative to the first index profile. Ambient light incident on the first patterned layer and the second patterned layer creates a first diffracted ray and a second diffracted ray, respectively, and the first diffracted ray and the second diffracted ray destructively interfere with each other based in part on the inverted index profile.
    Type: Application
    Filed: August 3, 2018
    Publication date: February 6, 2020
    Inventors: Erik Shipton, Giuseppe Calafiore, Pasi Saarikko
  • Patent number: 10546430
    Abstract: A near-eye display (NED) has an orientation detection device and a display block. The orientation detection device collects orientation data that describe an orientation of the NED. The display block has a display assembly, a focusing assembly, and a controller. The controller determines an orientation vector of the NED based in part on the orientation data and computes an angular difference between the orientation vector of the NED and a gravity vector. After comparing the angular difference to a threshold value, the controller generates multifocal instructions that adjusts the optical element to display an augmented scene at the selected image plane corresponding to the multifocal instructions.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: January 28, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Lu Lu, Ji Luo, Nicholas Daniel Trail, Kevin James MacKenzie, Pasi Saarikko, Andrew John Ouderkirk, Scott Charles McEldowney
  • Patent number: 10539829
    Abstract: A varifocal block includes liquid crystal (LC) lens and a liquid lens structure in optical series. The LC lens has a plurality of optical states, including an additive state that adds optical power to the LC lens and a subtractive state that removes optical power from the LC lens. The liquid lens structure comprises a transparent substrate layer, a deformable membrane, and a volume of liquid enclosed between the transparent substrate layer and the deformable membrane. The deformable membrane has an adjustable range of optical power dependent on an adjustable curvature of the deformable membrane. The plurality of optical states of the LC lens and the adjustable range of optical power of the liquid lens structure together provide a continuous range of optical power for the varifocal block.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: January 21, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Lu Lu, Scott Charles McEldowney, Pasi Saarikko
  • Patent number: 10534209
    Abstract: A near-eye display (NED) includes a source assembly that emits image light, a waveguide-based display assembly, and a controller coupled to the waveguide-based display assembly, and an optical assembly. The waveguide-based display assembly includes a liquid crystal (LC) waveguide, an input area, and an output area. The LC waveguide comprising a first glass layer, a second glass layer, and a LC layer between the first and second glass layers. The LC waveguide propagates the image light in-coupled via the input area in accordance with emission instructions toward the output area that out-couples the image light to a user's eye. The controller generates the emission instructions and provides the emission instructions to the LC waveguide for generating the image light of substantially uniform brightness.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: January 14, 2020
    Assignee: Facebook Technologies, LLC
    Inventors: Yijing Fu, Lu Lu, Pasi Saarikko
  • Patent number: 10527858
    Abstract: A waveguide display is used for presenting media to a user. The waveguide assembly includes a light source, a source waveguide, an output waveguide, and a controller. The light source emits image light based on scanning instructions from the controller. The source waveguide receives the image light from the light source, expands the image light in at least one dimension, and outputs an expanded image light to the output waveguide at an input area. The output waveguide outputs the expanded image light from a portion of an output area based on a direction of the expanded light from the source waveguide.
    Type: Grant
    Filed: January 3, 2019
    Date of Patent: January 7, 2020
    Assignee: Facebook Technologies, LLC
    Inventor: Pasi Saarikko
  • Publication number: 20190391396
    Abstract: A waveguide display includes light sources, a source waveguide, an output waveguide, and a controller. Light from each of the light sources is coupled into the source waveguide. The source waveguide includes gratings with a constant period determined based on the conditions for total internal reflection and first order diffraction of the received image light. The emitted image light is coupled into the output waveguide at several entrance locations. The output waveguide outputs expanded image lights at a location offset from the entrance location, and the location/direction of the emitted expanded image light is based in part on the orientation of the light sources. Each of the expanded image light is associated with a field of view of the expanded image light emitted by the output waveguide.
    Type: Application
    Filed: August 22, 2019
    Publication date: December 26, 2019
    Inventor: Pasi Saarikko
  • Patent number: 10515574
    Abstract: A waveguide display includes a source assembly, an output waveguide, and a controller. The source assembly includes a light source and an optics system. The light source includes source elements arranged in a 1D or 2D array that emit image light. The optics system includes a scanning mirror assembly that scans the image light to particular locations based on scanning instructions. The output waveguide receives the scanned image light from the scanning mirror assembly and outputs an expanded image light. In some embodiments, the waveguide display includes a source waveguide and the 1D array of source elements. The source waveguide receives a conditioned image light from the source assembly. The controller generates the scanning instructions and provides the scanning instructions to the scanning mirror assembly. In some embodiments, the controller provides the scanning instructions to an actuator assembly of the source waveguide.
    Type: Grant
    Filed: July 10, 2019
    Date of Patent: December 24, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Wanli Chi, Pasi Saarikko, Hee Yoon Lee
  • Patent number: 10509158
    Abstract: A holographic Bragg grating is used as an output element for a waveguide in a lens used for artificial reality. By using a Bragg grating, a number of waveguides can be reduced. The output element has a first super grating and a second super grating written in a single grating layer of the waveguide. The first super grating has a grating vector that is skew to a grating vector of the second super grating to provide both deflection and out coupling for two-dimensional output coupling.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: December 17, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Patent number: 10509231
    Abstract: A waveguide display includes a light source assembly, an output waveguide, and a controller. The light source assembly emits an image light that propagates along an input wave vector. The output waveguide includes a waveguide body with two opposite surfaces. The output waveguide includes a first grating receiving an image light propagating along the input wave vector, a second grating, and a third grating positioned opposite to the second grating and outputting an expanded image light with wave vectors matching the input wave vector. The controller controls the illumination of the light source assembly to form a two-dimensional image.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: December 17, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Publication number: 20190353898
    Abstract: An optical system includes an optical waveguide, and a first optical element configured to direct a first ray, having a first circular polarization and impinging on the first optical element at a first incidence angle, in a first direction so that the first ray propagates through the optical waveguide via total internal reflection toward a second optical element. The first optical element is configured to also direct a second ray, having a second circular polarization that is distinct from the first circular polarization and impinging on the first optical element at the first incidence angle, in a second direction that is distinct from the first direction so that the second ray propagates away from the second optical element. The second optical element is configured to direct the first ray propagating through the optical waveguide toward a detector.
    Type: Application
    Filed: March 20, 2019
    Publication date: November 21, 2019
    Inventors: Babak Amirsolaimani, Pasi Saarikko, Ying Geng, Yusufu Njoni Bamaxam Sulai, Scott Charles McEldowney
  • Patent number: 10473939
    Abstract: A near-eye display includes a light source assembly, a first waveguide, an output waveguide, and a controller. The light source assembly emits image light including light within a first band and a second band. The first waveguide receives the image light, expands the received image light in at least one dimension, and outputs an image light. The output waveguide includes an output area and a plurality of input areas. Each input area receives the image light from the first waveguide. The output waveguide includes a holographic Bragg grating and the output waveguide expands the image light at least along two dimensions to form an expanded image light, and outputs the expanded image light toward an eyebox. The controller controls the scanning of the light source assembly and the first waveguide.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: November 12, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Publication number: 20190339436
    Abstract: A holographic Bragg grating is used as an output element for a waveguide in a lens used for artificial reality. By using a Bragg grating, a number of waveguides can be reduced. The output element has a first super grating and a second super grating written in a single grating layer of the waveguide. The first super grating has a grating vector that is skew to a grating vector of the second super grating to provide both deflection and out coupling for two-dimensional output coupling.
    Type: Application
    Filed: April 1, 2019
    Publication date: November 7, 2019
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Patent number: 10451947
    Abstract: A Pancharatnam Berry Phase (PBP) liquid crystal structure for adjusting or focusing light of a plurality of color channels emitted by a display of a head-mounted display (HMD) comprises a plurality of PBP active elements. Each PBP active element of the structure is configured to act as a half waveplate for light of a corresponding color channel, such that light of the corresponding color channel is adjusted by a predetermined amount. In addition, each PBP active element acts as a one waveplate for light of the remaining color channels, such that light of the remaining color channels passes through the PBP active element substantially unaffected. As such, the PBP structure is able to adjust incident light of the plurality of color channels uniformly in an apochromatic fashion.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: October 22, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Lu Lu, Wai Sze Tiffany Lam, Scott Charles McEldowney, Pasi Saarikko
  • Patent number: 10444510
    Abstract: A waveguide display includes a light source assembly, an output waveguide, and a controller. The light source assembly emits an image light that propagates along an input wave vector. The output waveguide includes a waveguide body with two opposite surfaces. The output waveguide includes a first grating receiving an image light propagating along the input wave vector, a second grating, and a third grating positioned opposite to the second grating and outputting an expanded image light with wave vectors matching the input wave vector. The controller controls the illumination of the light source assembly to form a two-dimensional image.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: October 15, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Hee Yoon Lee, Wanli Chi, Pasi Saarikko
  • Patent number: 10429652
    Abstract: A waveguide display includes light sources, a source waveguide, an output waveguide, and a controller. Light from each of the light sources is coupled into the source waveguide. The source waveguide includes gratings with a constant period determined based on the conditions for total internal reflection and first order diffraction of the received image light. The emitted image light is coupled into the output waveguide at several entrance locations. The output waveguide outputs expanded image lights at a location offset from the entrance location, and the location/direction of the emitted expanded image light is based in part on the orientation of the light sources. Each of the expanded image light is associated with a field of view of the expanded image light emitted by the output waveguide.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: October 1, 2019
    Assignee: Facebook Technologies, LLC
    Inventor: Pasi Saarikko