Patents by Inventor Pasi Petteri Pietilae
Pasi Petteri Pietilae 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: 11762143Abstract: 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: GrantFiled: June 3, 2021Date of Patent: September 19, 2023Assignee: Microsoft Technology Licensing, LLCInventors: Pasi Petteri Pietilae, Tuomas Heikki Sakari Vallius, Jani Kari Tapio Tervo
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Publication number: 20220390666Abstract: 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: ApplicationFiled: June 3, 2021Publication date: December 8, 2022Applicant: Microsoft Technology Licensing, LLCInventors: Pasi Petteri PIETILAE, Tuomas Heikki Sakari VALLIUS, Jani Kari Tapio TERVO
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Publication number: 20220360047Abstract: A laser chip is described which comprises a plurality of gain areas. Each gain area comprises a ridge waveguide and a wavelength locking element, where the wavelength locking element in a gain area defines the output wavelength characteristics of visible light emitted from that gain area and adjacent gain areas comprise different wavelength locking elements.Type: ApplicationFiled: May 6, 2021Publication date: November 10, 2022Inventors: Pasi Petteri PIETILAE, Pietari TUOMISTO, Simo Kaarlo Tapani TAMMELA
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Patent number: 10281726Abstract: A multi-chromatic optical waveguide for a near-eye display (NED) device includes reflective/refractive structures and periodic grating structures. Image incoupling and outcoupling can be done by reflective mirrors/facets, and image expansion can done by one or more even order expansion gratings. Wider field of view can be by achieved by splitting the field-of-view into multiple portions that propagate in different directions within the waveguide and then recombining those portions in the outcoupling region of the waveguide.Type: GrantFiled: April 4, 2017Date of Patent: May 7, 2019Assignee: Microsoft Technology Licensing, LLCInventors: Tuomas Heikki Sakari Vallius, Pasi Petteri Pietilä
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Publication number: 20190056591Abstract: An optical waveguide that performs both in-coupling and out-coupling of projected light is provided. The out-coupling region of the waveguide comprises a single-sided or double-sided diffraction grating with at least one of the grating structures conformally coated with a high refractive index material. To reduce the unwanted reflection of light on the waveguide surfaces coated with the high refractive index material, additional antireflective coatings are applied to the diffraction grating areas with the high refractive index coating. The additional antireflective coatings may be very thin to avoid in-coupling, and therefore avoid interference in one or more light rays propagating in the optical waveguide. Alternatively, the antireflective coatings may be very thick to promote in-coupling such that the resulting interference becomes consistent across all light rays propagating in the optical waveguide.Type: ApplicationFiled: August 18, 2017Publication date: February 21, 2019Inventors: Jani Kari Tapio TERVO, Pasi Petteri PIETILAE, Lauri Tuomas SAINIEMI, Pasi KOSTAMO, Ari Juhani TERVONEN, Tommi Juhani RIEKKINEN
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Publication number: 20180284439Abstract: A multi-chromatic optical waveguide for a near-eye display (NED) device includes reflective/refractive structures and periodic grating structures. Image incoupling and outcoupling can be done by reflective mirrors/facets, and image expansion can done by one or more even order expansion gratings. Wider field of view can be by achieved by splitting the field-of-view into multiple portions that propagate in different directions within the waveguide and then recombining those portions in the outcoupling region of the waveguide.Type: ApplicationFiled: April 4, 2017Publication date: October 4, 2018Inventors: Tuomas Heikki Sakari Vallius, Pasi Petteri Pietilä
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Patent number: 9939647Abstract: An extended field of view (FOV) is provided by an exit pupil expander in a near-eye display system that uses a waveguide with multiple diffractive optical elements (DOEs) for in-coupling light, expanding the pupil in two directions, and out-coupling light to a system user's eye. Left and right in-coupling DOEs in-couple pupils respectively produced by a pair of imagers—one imager provides a left portion of the FOV and the other imager provides the right portion. The left portion and right portion of the FOV respectively propagate in a left and right intermediate DOEs which expand the pupil in a first direction and diffract light to an out-coupling DOE. The out-coupling DOE expands the pupil in a second direction, stitches the extended FOV together by combining the left and right portions of the FOV produced by the imagers, and out-couples the extended FOV to the user's eye.Type: GrantFiled: June 20, 2016Date of Patent: April 10, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Tuomas Vallius, Pasi Petteri Pietilae
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Publication number: 20170363871Abstract: An extended field of view (FOV) is provided by an exit pupil expander in a near-eye display system that uses a waveguide with multiple diffractive optical elements (DOEs) for in-coupling light, expanding the pupil in two directions, and out-coupling light to a system user's eye. Left and right in-coupling DOEs in-couple pupils respectively produced by a pair of imagers—one imager provides a left portion of the FOV and the other imager provides the right portion. The left portion and right portion of the FOV respectively propagate in a left and right intermediate DOEs which expand the pupil in a first direction and diffract light to an out-coupling DOE. The out-coupling DOE expands the pupil in a second direction, stitches the extended FOV together by combining the left and right portions of the FOV produced by the imagers, and out-couples the extended FOV to the user's eye.Type: ApplicationFiled: June 20, 2016Publication date: December 21, 2017Inventors: Tuomas Vallius, Pasi Petteri Pietilae
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Publication number: 20170176747Abstract: Disclosed are an apparatus and method for increasing the FOV of displayed images in a head-mounted display (HMD) device. A display apparatus comprises a display module and a waveguide optically coupled to the display module. The display module may generate individually multiple different portions of an image, to be conveyed to an optical receptor of a user of the HMD device, and may include multiple optical output ports, each to output a different portion of the image. The waveguide may include multiple optical input ports, each optically coupled to a different one of the optical output ports of the display module, where the waveguide is configured to output, to the optical receptor of the user, light corresponding to the image in its entirety.Type: ApplicationFiled: December 21, 2015Publication date: June 22, 2017Inventors: Tuomas Heikki Sakari Vallius, Richard Andrew Wall, Pasi Petteri Pietilä, Yarn Chee Poon, Ian Anh Nguyen, Jeb Wu
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Patent number: 9671615Abstract: In a near-eye optical display system comprising a waveguide and diffractive optical elements (DOEs) configured for in-coupling, exit pupil expansion, and out-coupling, a wide-spectrum imager generates imaging light that is in-coupled to the system with an input pupil having an extended field of view (FOV). Wide-spectrum imaging light impinges on the in-coupling DOE over a range of incidence angles. As chromatic dispersion in the in-coupling DOE causes different wavelengths to propagate with different angles, for a given input pupil incidence angle, at least a portion of the imaging light spectrum meets a critical angle condition that enables propagation with total internal reflection (TIR) in the waveguide without leakage to the outside. Thus, different parts of the imaging light spectrum can be used for different regions of the FOV.Type: GrantFiled: December 1, 2015Date of Patent: June 6, 2017Assignee: MICROSOFT TECHNOLOGY LICENSING, LLCInventors: Tuomas Vallius, Pasi Petteri Pietilae
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Publication number: 20170153460Abstract: In a near-eye optical display system comprising a waveguide and diffractive optical elements (DOEs) configured for in-coupling, exit pupil expansion, and out-coupling, a wide-spectrum imager generates imaging light that is in-coupled to the system with an input pupil having an extended field of view (FOV). Wide-spectrum imaging light impinges on the in-coupling DOE over a range of incidence angles. As chromatic dispersion in the in-coupling DOE causes different wavelengths to propagate with different angles, for a given input pupil incidence angle, at least a portion of the imaging light spectrum meets a critical angle condition that enables propagation with total internal reflection (TIR) in the waveguide without leakage to the outside. Thus, different parts of the imaging light spectrum can be used for different regions of the FOV.Type: ApplicationFiled: December 1, 2015Publication date: June 1, 2017Inventors: Tuomas Vallius, Pasi Petteri Pietilae