Patents by Inventor Jani Kari Tapio Tervo

Jani Kari Tapio Tervo 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).

  • Patent number: 11782277
    Abstract: A waveguide display includes multiple diffractive optical elements (DOEs) that are configured to in-couple image light, provide expanded exit pupil in two directions, and out-couple the image light to a user. An in-coupling DOE is configured to split the full field of view (FOV) of the image light into left and right portions. The left and right FOV portions are respectively propagated laterally in left and right directions in intermediate DOEs which comprise upper and lower portions. The intermediate DOEs provide for exit pupil expansion in a horizontal direction while coupling light to an out-coupling DOE. The out-coupling DOE provides for exit pupil expansion in a vertical direction and out-couples image light with expanded exit pupil for the full FOV. The intermediate DOE portions are configured to steer image light back towards the center of the waveguide to avoid dark areas or stripes in portions of the out-coupling DOE.
    Type: Grant
    Filed: March 26, 2021
    Date of Patent: October 10, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Jani Kari Tapio Tervo
  • Patent number: 11762143
    Abstract: A waveguide display assembly comprises a waveguide, including an in-coupling grating configured to in-couple light of a first wavelength band emitted by a light source into the waveguide, and cause propagation of the light of the first wavelength band through the waveguide via total internal reflection. An out-coupling grating is configured to out-couple the light of the first wavelength band from the waveguide and toward a user eye. One or more diffractive gratings are disposed along an optical path between the in-coupling grating and the out-coupling grating, the one or more diffractive gratings configured to diffract light outside the first wavelength band out of the waveguide and away from the user eye.
    Type: Grant
    Filed: June 3, 2021
    Date of Patent: September 19, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Pasi Petteri Pietilae, Tuomas Heikki Sakari Vallius, Jani Kari Tapio Tervo
  • Patent number: 11747621
    Abstract: Reflectors comprising thin film dichroic coatings are located on various components of a waveguide-based optical combiner in a see-through display of a head-mounted display (HMD) device to reduce color cross-coupling in holographic images and reflect forward-projected holographic image light back to a user's eye. The dichroic coatings implement narrowband reflectors for each of one or more colors of an RGB (red, green, blue) color model over the angular range associated with the field of view (FOV) of the virtual portion of the see-through display. Utilization of the dichroic coatings can improve virtual display uniformity and lessen sharp edge defects by reducing cross-coupling and may also improve light security by reducing the forward-projected holographic image light that escapes from the HMD device.
    Type: Grant
    Filed: November 7, 2020
    Date of Patent: September 5, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Tuomas Heikki Sakari Vallius, Pietari Tuomisto, Jani Kari Tapio Tervo
  • Publication number: 20230237678
    Abstract: A display system includes a waveguide plate comprising an in-coupling grating, an expansion grating, and a sampling grating. The display system includes a projection system configured to direct input light toward the in-coupling grating. The in-coupling grating is configured to diffract the input light to propagate within the waveguide plate. The in-coupling grating is configured to (i) cause a display portion of the input light to propagate toward the expansion grating in a manner that avoids diffraction by the expansion grating and (ii) cause a sampling portion of the input light to propagate toward the sampling grating. The expansion grating is configured to (i) diffract the display portion of the input light to cause the display portion of the input light to continue to propagate within the waveguide plate. The sampling grating is configured to diffract the sampling portion of the input light outward from the waveguide plate.
    Type: Application
    Filed: January 26, 2022
    Publication date: July 27, 2023
    Inventors: Ari Juhani TERVONEN, Jani Kari Tapio TERVO
  • Publication number: 20230072472
    Abstract: A near-eye optical display system that may be utilized in mixed reality applications and devices includes a see-through waveguide on which diffractive optical elements (DOEs) are disposed that are configured for in-coupling, exit pupil expansion, and out-coupling. The optical display system includes a conformal coating that is thickness modulated over different areas of the display to enable tuning of the optical parameters such as refractive index and reflectivity to meet various design requirements. The conformal coating may also be utilized to enhance physical characteristics of the optical display system to thereby improve reliability and resist wear and damage from handling and exposure to environmental elements.
    Type: Application
    Filed: May 16, 2022
    Publication date: March 9, 2023
    Inventors: Tapani Matias ALASAARELA, Jani Kari Tapio TERVO
  • Patent number: 11531202
    Abstract: An optical combiner, configured for use in a mixed-reality display system that combines holographic and real-world images, includes an assembly of see-through waveguides that are arranged in a stack to provide full color holographic images from constituent RGB (red, green, and blue) color components received from a holographic image source. Each waveguide—one per RGB color component—includes an in-coupling DOE (diffractive optical element), an intermediate DOE, and an out-coupling DOE that are disposed on internal surfaces of the stacked waveguides in the optical combiner. Each of the out-coupling DOEs incorporates a diffractive lens functionality to render the out-coupled holographic images at a set depth on the mixed-reality display. In an illustrative non-limiting example, the out-coupling DOE may provide a half diopter of negative lens power to set the optical focus of the holographic images at 1.33 m.
    Type: Grant
    Filed: November 5, 2020
    Date of Patent: December 20, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: David Bohn, Tuomas Vallius, Jani Kari Tapio Tervo
  • Publication number: 20220390666
    Abstract: A waveguide display assembly comprises a waveguide, including an in-coupling grating configured to in-couple light of a first wavelength band emitted by a light source into the waveguide, and cause propagation of the light of the first wavelength band through the waveguide via total internal reflection. An out-coupling grating is configured to out-couple the light of the first wavelength band from the waveguide and toward a user eye. One or more diffractive gratings are disposed along an optical path between the in-coupling grating and the out-coupling grating, the one or more diffractive gratings configured to diffract light outside the first wavelength band out of the waveguide and away from the user eye.
    Type: Application
    Filed: June 3, 2021
    Publication date: December 8, 2022
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Pasi Petteri PIETILAE, Tuomas Heikki Sakari VALLIUS, Jani Kari Tapio TERVO
  • Patent number: 11353702
    Abstract: A near-eye optical display system that may be utilized in mixed reality applications and devices includes a see-through waveguide on which diffractive optical elements (DOEs) are disposed that are configured for in-coupling, exit pupil expansion, and out-coupling. The optical display system includes a conformal coating that is thickness modulated over different areas of the display to enable tuning of the optical parameters such as refractive index and reflectivity to meet various design requirements. The conformal coating may also be utilized to enhance physical characteristics of the optical display system to thereby improve reliability and resist wear and damage from handling and exposure to environmental elements.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: June 7, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Tapani Matias Alasaarela, Jani Kari Tapio Tervo
  • Publication number: 20220146827
    Abstract: Reflectors comprising thin film dichroic coatings are located on various components of a waveguide-based optical combiner in a see-through display of a head-mounted display (HMD) device to reduce color cross-coupling in holographic images and reflect forward-projected holographic image light back to a user's eye. The dichroic coatings implement narrowband reflectors for each of one or more colors of an RGB (red, green, blue) color model over the angular range associated with the field of view (FOV) of the virtual portion of the see-through display. Utilization of the dichroic coatings can improve virtual display uniformity and lessen sharp edge defects by reducing cross-coupling and may also improve light security by reducing the forward-projected holographic image light that escapes from the HMD device.
    Type: Application
    Filed: November 7, 2020
    Publication date: May 12, 2022
    Inventors: Tuomas Heikki Sakari VALLIUS, Pietari TUOMISTO, Jani Kari Tapio TERVO
  • Publication number: 20220137408
    Abstract: An optical combiner, configured for use in a mixed-reality display system that combines holographic and real-world images, includes an assembly of see-through waveguides that are arranged in a stack to provide full color holographic images from constituent RGB (red, green, and blue) color components received from a holographic image source. Each waveguide—one per RGB color component—includes an in-coupling DOE (diffractive optical element), an intermediate DOE, and an out-coupling DOE that are disposed on internal surfaces of the stacked waveguides in the optical combiner. Each of the out-coupling DOEs incorporates a diffractive lens functionality to render the out-coupled holographic images at a set depth on the mixed-reality display. In an illustrative non-limiting example, the out-coupling DOE may provide a half diopter of negative lens power to set the optical focus of the holographic images at 1.33 m.
    Type: Application
    Filed: November 5, 2020
    Publication date: May 5, 2022
    Inventors: David BOHN, Tuomas VALLIUS, Jani Kari Tapio TERVO
  • Patent number: 11131807
    Abstract: An optical waveguide comprises one or more upstream diffraction gratings in addition to overlapping first and second downstream diffraction gratings. The one or more upstream diffraction gratings include a first upstream diffraction grating configured to receive display light and to release the display light expanded along a first axis. The first and second downstream diffraction gratings are configured to receive the display light expanded along the first axis and to cooperatively release the display light further expanded along a second axis. The first downstream diffraction grating is arranged on a planar face of the optical waveguide and is further configured to further expand along the first axis the display light expanded along the first axis.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: September 28, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Jani Kari Tapio Tervo, Ari Juhani Tervonen, Heikki Juhana Hyvarinen
  • Publication number: 20210215936
    Abstract: A waveguide display includes multiple diffractive optical elements (DOEs) that are configured to in-couple image light, provide expanded exit pupil in two directions, and out-couple the image light to a user. An in-coupling DOE is configured to split the full field of view (FOV) of the image light into left and right portions. The left and right FOV portions are respectively propagated laterally in left and right directions in intermediate DOEs which comprise upper and lower portions. The intermediate DOEs provide for exit pupil expansion in a horizontal direction while coupling light to an out-coupling DOE. The out-coupling DOE provides for exit pupil expansion in a vertical direction and out-couples image light with expanded exit pupil for the full FOV. The intermediate DOE portions are configured to steer image light back towards the center of the waveguide to avoid dark areas or stripes in portions of the out-coupling DOE.
    Type: Application
    Filed: March 26, 2021
    Publication date: July 15, 2021
    Inventor: Jani Kari Tapio Tervo
  • Patent number: 10969585
    Abstract: A waveguide display includes multiple diffractive optical elements (DOEs) that are configured to in-couple image light, provide expanded exit pupil in two directions, and out-couple the image light to a user. An in-coupling DOE is configured to split the full field of view (FOV) of the image light into left and right portions. The left and right FOV portions are respectively propagated laterally in left and right directions in intermediate DOEs which comprise upper and lower portions. The intermediate DOEs provide for exit pupil expansion in a horizontal direction while coupling light to an out-coupling DOE. The out-coupling DOE provides for exit pupil expansion in a vertical direction and out-couples image light with expanded exit pupil for the full FOV. The intermediate DOE portions are configured to steer image light back towards the center of the waveguide to avoid dark areas or stripes in portions of the out-coupling DOE.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: April 6, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Jani Kari Tapio Tervo
  • Publication number: 20200409148
    Abstract: A near-eye optical display system that may be utilized in mixed reality applications and devices includes a see-through waveguide on which diffractive optical elements (DOEs) are disposed that are configured for in-coupling, exit pupil expansion, and out-coupling. The optical display system includes a conformal coating that is thickness modulated over different areas of the display to enable tuning of the optical parameters such as refractive index and reflectivity to meet various design requirements. The conformal coating may also be utilized to enhance physical characteristics of the optical display system to thereby improve reliability and resist wear and damage from handling and exposure to environmental elements.
    Type: Application
    Filed: June 25, 2019
    Publication date: December 31, 2020
    Inventors: Tapani Matias ALASAARELA, Jani Kari Tapio TERVO
  • Patent number: 10782458
    Abstract: An optical device includes a single waveguide plate. The single waveguide plate includes a first DOE including an in-coupling element having at least two periods and orientations. The optical device further includes a second DOE optically coupled to the first DOE. The second DOE includes a plurality of expansion gratings. At least one of the expansion gratings includes a plurality of wings. The optical device includes a third DOE optically coupled to the second DOE. The third DOE includes an out-coupling grating having at least two periods and orientations.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: September 22, 2020
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventor: Jani Kari Tapio Tervo
  • Publication number: 20200192025
    Abstract: An optical waveguide comprises one or more upstream diffraction gratings in addition to overlapping first and second downstream diffraction gratings. The one or more upstream diffraction gratings include a first upstream diffraction grating configured to receive display light and to release the display light expanded along a first axis. The first and second downstream diffraction gratings are configured to receive the display light expanded along the first axis and to cooperatively release the display light further expanded along a second axis. The first downstream diffraction grating is arranged on a planar face of the optical waveguide and is further configured to further expand along the first axis the display light expanded along the first axis.
    Type: Application
    Filed: February 24, 2020
    Publication date: June 18, 2020
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Jani Kari Tapio TERVO, Ari Juhani TERVONEN, Heikki Juhana HYVARINEN
  • Patent number: 10670805
    Abstract: An optical waveguide that performs both in-coupling and out-coupling using two diffractive optical elements is provided. Each optical element is a diffraction grating and can be applied to the same or different surface of the optical waveguide. The diffraction gratings overlap to form two overlapping regions. The first overlapping region in-couples light into the waveguide and the second overlapping region out-couples light from the optical waveguide. Because the optical waveguide only uses two gratings, and therefore only has two grating vectors, the optical waveguide is easier to manufacture than optical waveguides with a greater number of grating vectors.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: June 2, 2020
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Jani Kari Tapio Tervo
  • Patent number: 10551622
    Abstract: An input-coupler of an optical waveguide includes one or more Bragg polarization gratings for coupling light corresponding to the image in two different directions into the optical waveguide. The input-coupler splits the FOV of the image coupled into the optical waveguide into first and second portions by diffracting a portion of the light corresponding to the image in a first direction toward a first intermediate component, and diffracting a portion of the light corresponding to the image in a second direction toward a second intermediate component. An output-coupler of the waveguide combines the light corresponding to the first and second portions of the FOV, and couples the light corresponding to the combined first and second portions of the FOV out of the optical waveguide so that the light corresponding to the image and the combined first and second portions of the FOV is output from the optical waveguide.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: February 4, 2020
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Steven John Robbins, Joshua Owen Miller, Richard Andrew Wall, Eliezer Glik, Jani Kari Tapio Tervo, Bernard Kress, Xinye Lou
  • Publication number: 20190361156
    Abstract: An optical device includes a single waveguide plate. The single waveguide plate includes a first DOE including an in-coupling element having at least two periods and orientations. The optical device further includes a second DOE optically coupled to the first DOE. The second DOE includes a plurality of expansion gratings. At least one of the expansion gratings includes a plurality of wings. The optical device includes a third DOE optically coupled to the second DOE. The third DOE includes an out-coupling grating having at least two periods and orientations.
    Type: Application
    Filed: August 9, 2019
    Publication date: November 28, 2019
    Inventor: Jani Kari Tapio TERVO
  • Publication number: 20190317270
    Abstract: A near eye display system includes a waveguide display that presents to the eyes of a viewer mixed-reality or virtual-reality images. The waveguide display includes two or more waveguide plates that are stacked over one another with an air gap between them. The waveguide plates are tilted so that they are not parallel to one another. In this way the spacing or air gap between the waveguide plates varies across the area of the plates.
    Type: Application
    Filed: April 17, 2018
    Publication date: October 17, 2019
    Inventors: Simo Kaarlo Tapani TAMMELA, Ari Juhani TERVONEN, Jani Kari Tapio TERVO, Lasse Pekka KARVONEN