Patents by Inventor Bernard Charles Kress

Bernard Charles Kress 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: 12007655
    Abstract: Examples are disclosed relating to tunable attenuation of incident light using a switchable grating. One example provides an optical attenuator comprising a switchable grating configured to diffract light within a wavelength band at a diffraction angle. The optical attenuator further comprises an electrode pair configured to apply a voltage across the switchable grating to tune a proportion of incident light diffracted at the diffraction angle, and an optical dump to receive the proportion of incident light diffracted.
    Type: Grant
    Filed: May 25, 2021
    Date of Patent: June 11, 2024
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Bernard Charles Kress, Ashley N Saulsbury
  • Patent number: 11953686
    Abstract: An optical combiner in a display system of a mixed-reality head-mounted display (HMD) device comprises a lens of birefringent material and a ferroelectric liquid crystal (FLC) modulator that are adapted for use with a reflective waveguide to provide multiple different focal planes on which holograms of virtual-world objects (i.e., virtual images) are displayed. The birefringent lens has two orthogonal refractive indices, ordinary and extraordinary, depending on the polarization state of the incident light. Depending on the rotation of the polarization axis by the FLC modulator, the incoming light to the birefringent lens is focused either at a distance corresponding to the ordinary refractive index or the extraordinary refractive index. Virtual image light leaving the birefringent lens is in-coupled to a see-through reflective waveguide which is configured to form an exit pupil for the optical combiner to enable an HMD device user to view the virtual images from the source.
    Type: Grant
    Filed: September 26, 2021
    Date of Patent: April 9, 2024
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Robert Thomas Held, Bernard Charles Kress, Ashley Saulsbury, Dmitry Reshidko
  • Publication number: 20240085714
    Abstract: The present disclosure describes near-eye display systems including an array of projectors and a one-dimensional exit pupil expander. The array of projectors can be arranged along a first dimension and can output image light towards an input coupler within a waveguide that provides one-dimensional exit pupil expansion. In some implementations, arrays of monochromatic projectors are implemented and arranged in offset columns. The input coupler in-couples the image light from the array of projectors into a TIR path within the waveguide. Different optical elements, including diffractive and reflective optics, may be implemented as the input coupler. The image light travels within the waveguide until it interacts with an output coupler. Upon interaction with the output coupler, the image light is expanded in a second dimension transverse to the first dimension and is coupled out of the waveguide.
    Type: Application
    Filed: September 14, 2022
    Publication date: March 14, 2024
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Joel Steven KOLLIN, Andreas GEORGIOU, Ishan CHATTERJEE, Bernard Charles KRESS, Maria Esther PACE, Mario POSSIWAN
  • Patent number: 11852824
    Abstract: Examples are disclosed that relate to using an array of hot mirrors in an eye-imaging system. One example provides a head-mounted display system, comprising a frame, an eye-imaging camera supported on the frame, a switchable hot mirror array comprising a plurality of switchable hot mirrors configured to direct light reflecting from an eye toward the eye-imaging camera, and a controller configured to control switching of a reflectivity of each of the plurality of switchable hot mirrors.
    Type: Grant
    Filed: April 4, 2022
    Date of Patent: December 26, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Benjamin Eliot Lundell, Joel Steven Kollin, Ishan Chatterjee, Maria Esther Pace, Mark Theodore Bolas, Bernard Charles Kress, Robert Thomas Held, Andreas Georgiou, Christopher Charles Aholt
  • Publication number: 20230350212
    Abstract: Variable-focus lenses are arranged as a lens pair that work on opposite sides of a see-through optical combiner used in a mixed-reality head-mounted display (HMD) device. An eye-side variable-focus lens is configured as a negative lens over an eyebox of the see-through optical combiner to enable virtual-world objects to be set at a close distance. The negative lens is compensated by its conjugate using a real-world-side variable-focus lens configured as a positive lens to provide an unperturbed see-through experience. For non-presbyopes, the powers of the lenses are perfectly offset. For presbyopes, the lens powers is mismatched at times to provide simultaneous views of both virtual-world and real-world objects on the display in sharp focus. Responsively an eye tracker indicating that the user is engaged in close viewing, optical power is added to the real-world-side lens to push close real-world objects optically farther away into sharp focus for the presbyopic user.
    Type: Application
    Filed: July 11, 2023
    Publication date: November 2, 2023
    Inventors: Robert Thomas HELD, Bernard Charles KRESS, Ashley SAULSBURY, Dmitry RESHIDKO
  • Publication number: 20230314803
    Abstract: Examples are disclosed that relate to using an array of hot mirrors in an eye-imaging system. One example provides a head-mounted display system, comprising a frame, an eye-imaging camera supported on the frame, a switchable hot mirror array comprising a plurality of switchable hot mirrors configured to direct light reflecting from an eye toward the eye-imaging camera, and a controller configured to control switching of a reflectivity of each of the plurality of switchable hot mirrors.
    Type: Application
    Filed: April 4, 2022
    Publication date: October 5, 2023
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Benjamin Eliot LUNDELL, Joel Steven KOLLIN, Ishan CHATTERJEE, Maria Esther PACE, Mark Theodore BOLAS, Bernard Charles KRESS, Robert Thomas HELD, Andreas GEORGIOU, Christopher Charles AHOLT
  • Publication number: 20230314816
    Abstract: A display engine adapted for use in a head-mounted display (HMD) device includes a reflective liquid crystal on silicon (LCoS) spatial light modulator (SLM) that is illuminated using a backlight illumination module and a pair of optical prisms providing a total internal reflection (TIR) function. In an illustrative mixed-reality embodiment, the TIR prism pair guides light to the LCoS SLM from the backlight illumination module and projects virtual images reflected from the LCoS SLM, through projection optics, to a diffractive waveguide combiner for viewing by an HMD user.
    Type: Application
    Filed: June 7, 2023
    Publication date: October 5, 2023
    Inventors: Ishan CHATTERJEE, Dmitry RESHIDKO, Bernard Charles KRESS
  • Patent number: 11768375
    Abstract: Variable-focus lenses are arranged as a lens pair that work on opposite sides of a see-through optical combiner used in a mixed-reality head-mounted display (HMD) device. An eye-side variable-focus lens is configured as a negative lens over an eyebox of the see-through optical combiner to enable virtual-world objects to be set at a close distance. The negative lens is compensated by its conjugate using a real-world-side variable-focus lens configured as a positive lens to provide for an unperturbed see-through experience. For non-presbyopes, the powers of the lenses are perfectly offset. For presbyopes, the lens powers may be mismatched at times to provide simultaneous views of both virtual-world and real-world objects on the display in sharp focus. Responsively an eye tracker indicating that the user is engaged in close viewing, optical power is added to the real-world-side lens to push close real-world objects optically farther away and into sharp focus for the presbyopic user.
    Type: Grant
    Filed: September 3, 2021
    Date of Patent: September 26, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Robert Thomas Held, Bernard Charles Kress, Ashley Saulsbury, Dmitry Reshidko
  • Publication number: 20230273432
    Abstract: Slanted surface relief gratings for use in an optical display system in an HMD device are replicated in a manufacturing process that utilizes non-contact optical proximity recording into a specialized photo-sensitive resin that is disposed over a waveguide substrate. The recording process comprises selective resin exposure to ultraviolet light through a mask to spatially record grating structures by interferential exposure and polymerization. Subsequent resin development evacuates unexposed resin down to the waveguide substrate to remove flat surfaces, referred to as a bias layer, that remain in the grating trenches after exposure. The resin development reduces Fresnel reflections that could otherwise be induced at the media interface between the bias layer and the waveguide substrate. Fresnel reflections may cause a loss of diffraction efficiency and thereby reduce the field of view that may be guided by the SRGs in the optical display system.
    Type: Application
    Filed: February 3, 2022
    Publication date: August 31, 2023
    Inventors: Bernard Charles KRESS, Ishan CHATTERJEE, Joel Steven KOLLIN, Maria Esther PACE
  • Publication number: 20230236417
    Abstract: Examples are disclosed that relate to a compact optical systems comprising SLMs. One example provides a projection system comprising an illumination stage including a light emitting diode (LED) array. The LED array comprises a plurality of red LEDs, a plurality of green LEDs, and a plurality of blue LEDs. The illumination stage further comprises an illumination stage optical system configured to control an angular extent of light emitted by the LED array and homogenize the light emitted by the LED array. The projection system further comprises an image forming stage configured to form an image from light output by the illumination stage, the image forming stage comprising a spatial light modulator (SLM) configured to spatially modulate the light output by the illumination stage to form an image, and one or more projection optics configured to project the image formed by the spatial light modulator.
    Type: Application
    Filed: January 24, 2022
    Publication date: July 27, 2023
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Ishan CHATTERJEE, Fei CHEN, Bernard Charles KRESS, Maria Esther PACE, Joel Steven KOLLIN, Scott Jeffrey WOLTMAN
  • Patent number: 11693248
    Abstract: A display engine adapted for use in a head-mounted display (HMD) device includes a reflective liquid crystal on silicon (LCoS) spatial light modulator (SLM) that is illuminated using a backlight illumination module and a pair of optical prisms providing a total internal reflection (TIR) function. In an illustrative mixed-reality embodiment, the TIR prism pair guides light to the LCoS SLM from the backlight illumination module and projects virtual images reflected from the LCoS SLM, through projection optics, to a diffractive waveguide combiner for viewing by an HMD user.
    Type: Grant
    Filed: January 20, 2022
    Date of Patent: July 4, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Ishan Chatterjee, Dmitry Reshidko, Bernard Charles Kress
  • Publication number: 20230103091
    Abstract: An optical combiner in a display system of a mixed-reality head-mounted display (HMD) device comprises a lens of birefringent material and a ferroelectric liquid crystal (FLC) modulator that are adapted for use with a reflective waveguide to provide multiple different focal planes on which holograms of virtual-world objects (i.e., virtual images) are displayed. The birefringent lens has two orthogonal refractive indices, ordinary and extraordinary, depending on the polarization state of the incident light. Depending on the rotation of the polarization axis by the FLC modulator, the incoming light to the birefringent lens is focused either at a distance corresponding to the ordinary refractive index or the extraordinary refractive index. Virtual image light leaving the birefringent lens is in-coupled to a see-through reflective waveguide which is configured to form an exit pupil for the optical combiner to enable an HMD device user to view the virtual images from the source.
    Type: Application
    Filed: September 26, 2021
    Publication date: March 30, 2023
    Inventors: Robert Thomas HELD, Bernard Charles KRESS, Ashley SAULSBURY, Dmitry RESHIDKO
  • Publication number: 20230069895
    Abstract: Variable-focus lenses are arranged as a lens pair that work on opposite sides of a see-through optical combiner used in a mixed-reality head-mounted display (HMD) device. An eye-side variable-focus lens is configured as a negative lens over an eyebox of the see-through optical combiner to enable virtual-world objects to be set at a close distance. The negative lens is compensated by its conjugate using a real-world-side variable-focus lens configured as a positive lens to provide for an unperturbed see-through experience. For non-presbyopes, the powers of the lenses are perfectly offset. For presbyopes, the lens powers may be mismatched at times to provide simultaneous views of both virtual-world and real-world objects on the display in sharp focus. Responsively an eye tracker indicating that the user is engaged in close viewing, optical power is added to the real-world-side lens to push close real-world objects optically farther away and into sharp focus for the presbyopic user.
    Type: Application
    Filed: September 3, 2021
    Publication date: March 9, 2023
    Inventors: Robert Thomas HELD, Bernard Charles KRESS, Ashley SAULSBURY, Dmitry RESHIDKO
  • Patent number: 11574389
    Abstract: A head-mounted display device including one or more position sensors and a processor. The processor may receive a rendered image of a current frame. The processor may receive position data from the one or more position sensors and determine an updated device pose based on the position data. The processor may apply a first spatial correction to color information in pixels of the rendered image at least in part by reprojecting the rendered image based on the updated device pose. The head-mounted display device may further include a display configured to apply a second spatial correction to the color information in the pixels of the rendered image at least in part by applying wobulation to the reprojected rendered image to thereby generate a sequence of wobulated pixel subframes for the current frame. The display may display the current frame by displaying the sequence of wobulated pixel subframes.
    Type: Grant
    Filed: February 9, 2022
    Date of Patent: February 7, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Jeffrey Neil Margolis, Bernard Charles Kress
  • Publication number: 20220413603
    Abstract: Examples are provided related to using multiplexed diffractive elements to improve eye tracking systems. One example provides a head-mounted display device comprising a see-through display system comprising a transparent combiner having an array of diffractive elements, and an eye tracking system comprising one or more light sources configured to direct light toward an eyebox of the see-through display system, and also comprising an eye tracking camera. The array of diffractive elements comprises a plurality of multiplexed diffractive elements configured to direct images of a respective plurality of different perspectives of the eyebox toward the eye tracking camera.
    Type: Application
    Filed: June 25, 2021
    Publication date: December 29, 2022
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Robert Thomas HELD, Andreas GEORGIOU, Bernard Charles KRESS, Joel Steven KOLLIN
  • Publication number: 20220382054
    Abstract: Examples are disclosed relating to tunable attenuation of incident light using a switchable grating. One example provides an optical attenuator comprising a switchable grating configured to diffract light within a wavelength band at a diffraction angle. The optical attenuator further comprises an electrode pair configured to apply a voltage across the switchable grating to tune a proportion of incident light diffracted at the diffraction angle, and an optical dump to receive the proportion of incident light diffracted.
    Type: Application
    Filed: May 25, 2021
    Publication date: December 1, 2022
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Bernard Charles Kress, Ashley N. Saulsbury
  • Patent number: 11514649
    Abstract: An augmented reality display device includes a near-eye display configured to present imagery to a user eye. A camera is configured to capture light from a real-world environment and produce output useable to contribute to the imagery presented to the user eye via the near-eye display. The camera includes an aperture configured to receive the light from the real-world environment and an image sensor configured to respond to the light received from the real-world environment by generating sensor output signals useable to produce images on the near-eye display depicting the real-world environment. One or more optical elements provide an optical path for light from the aperture to the image sensor, the optical path having a length that is within a threshold of a distance between the user eye and the aperture of the camera.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: November 29, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Robert Warren Gruen, Weige Chen, Michael George Boulton, Roberta Rene Moeur, Bernard Charles Kress
  • Patent number: 11467406
    Abstract: This document relates to an optical device using waveguide that can enable propagation of large field of view images by use of metasurfaces, without the necessity of increasing the reflective index associated with the waveguide. An optical assembly can generate a compressed image corresponding to a wide field of view in order to ensure that the image can propagate through the waveguide according to TIR limits of the waveguide. The compressed image can be provided to a standard grating in-coupler, and can then be expanded by a metasurface out-coupler of the optical device to reproduce the wide field of view.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: October 11, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Ishan Chatterjee, Bernard Charles Kress
  • Patent number: 11448883
    Abstract: This document relates to an optical device using waveguide that can enable propagation of large field of view images by use of metasurfaces, without the necessity of increasing the reflective index associated with the waveguide. The metasurfaces can further provide image distortion correction to images to account for possible distortion introduced by an optical assembly. The metasurfaces can also be used to create a foveated image, in order to achieve a larger field of view for the image.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: September 20, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Bernard Charles Kress, Ishan Chatterjee
  • Publication number: 20220270217
    Abstract: A head-mounted display device including one or more position sensors and a processor. The processor may receive a rendered image of a current frame. The processor may receive position data from the one or more position sensors and determine an updated device pose based on the position data. The processor may apply a first spatial correction to color information in pixels of the rendered image at least in part by reprojecting the rendered image based on the updated device pose. The head-mounted display device may further include a display configured to apply a second spatial correction to the color information in the pixels of the rendered image at least in part by applying wobulation to the reprojected rendered image to thereby generate a sequence of wobulated pixel subframes for the current frame. The display may display the current frame by displaying the sequence of wobulated pixel subframes.
    Type: Application
    Filed: February 9, 2022
    Publication date: August 25, 2022
    Applicant: Microsoft Technology Licensing, LLC
    Inventors: Jeffrey Neil MARGOLIS, Bernard Charles KRESS