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公开(公告)号：US10698214B2
公开(公告)日：2020-06-30
申请号：US15407957
申请日：2017-01-17
Applicant: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventor： Tuomas Vallius , Jani Tervo
Abstract: An optical waveguide including an input-coupler, a first intermediate-component, a second intermediate-component and an output-coupler is described herein. The input-coupler couples, into the waveguide, light corresponding to an image associated with an input-pupil and directs the light toward the first intermediate-component. The first intermediate-component performs horizontal or vertical pupil expansion and redirects the light corresponding to the image toward the output-coupler. The second intermediate-component is a diffractive component located between the first-intermediate component and the output-coupler and performs pupil redistribution on a portion of the light corresponding to the image before the portion reaches the output-coupler. The output-coupler performs the other one of horizontal or vertical pupil expansion and couples, out of the waveguide, the light corresponding to the image. Related methods and systems are also described.
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公开(公告)号：US10234686B2
公开(公告)日：2019-03-19
申请号：US14942408
申请日：2015-11-16
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius
Abstract: 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 rainbow phenomenon manifested in the display may be removed or reduced using a polarizing filter at the front of the system so that real-world/stray light entering the system has a particular polarization state, for example TM-polarized. The polarizing filter is utilized in conjunction with a downstream out-coupling DOE that includes diffractive grating structures that are configured to enable sensitivity to an opposite polarization state, for example TE-polarized. An imager is configured to produce virtual-world images that also have a TE-polarized state. The polarization-sensitive out-coupling DOE diffracts the TE-polarized imaging beam out of the grating for display while the TM-polarized light from the real world and/or stray light passes through the grating without diffraction and thus cannot contribute to rainbows in the display.
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公开(公告)号：US20190072767A1
公开(公告)日：2019-03-07
申请号：US15698456
申请日：2017-09-07
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius , Adrian Travis , Tero Ollikainen , Dmitry Reshidko
Abstract: Apparatuses and systems including curved optical waveguides, and methods for use therewith, are described herein. An output-grating of a curved waveguide includes a spatially modulated grating period configured to cause, for each beam of light corresponding to an image coupled into a bulk-substrate of the curved waveguide by an input-grating, corresponding rays of light output from different locations of the output-grating to be substantially collimated. Adaptive optics of a display engine compensate for aberrations that vary over a field-of-view associated with light corresponding to the image out-coupled by the output-grating. Further, a curved portion of the curved waveguide is designed to keep internally reflected light below a critical angle to prevent inadvertent out-coupling thereof. Further, curved surfaces of the curved waveguide can include polynomial surfaces to compensate for lateral color errors and distortion.
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公开(公告)号：US10025093B2
公开(公告)日：2018-07-17
申请号：US15097646
申请日：2016-04-13
Applicant: Microsoft Technology Licensing, LLC
Inventor： Richard Andrew Wall , Tuomas Vallius , Mikko Juhola
Abstract: A near eye or heads up display system includes a scan beam projector engine, an optical waveguide, and an exit pupil expander (EPE) optically coupled between the scan beam projector engine and the optical waveguide. The EPE improves the optical performance of the display system. The EPE could include a diffusive optical element, diffractive optical element, micro-lens array (MLA), or relay of aspherical lenses. A dual MLA EPE may have cells that prevent cross-talk between adjacent pixels. A dual MLA EPE may have a non-periodic lens array. The optical power of one MLA may be different from the other MLA.
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公开(公告)号：US20180196263A1
公开(公告)日：2018-07-12
申请号：US15402904
申请日：2017-01-10
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius , Mikko Antton Juhola
CPC classification number: G02B27/0172 , G02B2027/0138 , G02B2027/014 , G02B2027/0141 , G02B2027/0178 , G02F1/295 , G02F2001/291 , G02F2001/294 , G02F2201/302 , G02F2201/305 , G02F2203/22
Abstract: A near-eye optical display system utilized in augmented reality devices includes a see-through waveguide display having optical elements configured for in-coupling virtual images from an imager, exit pupil expansion, and out-coupling virtual images with expanded pupil to the user's eye. The near-eye optical display system further includes a curved two-sided array of electrically-activated tunable liquid crystal (LC) microlenses that is located between the waveguide and the user's eye. The LC microlenses are distributed in layers on each side of the two-sided array. Each pixel in the waveguide display is mapped to an LC microlens in the array, and multiple nearby pixels may be mapped to the same LC microlens. A region of the waveguide display that the user is gazing upon is detected and the LC microlens that is mapped to that region may be electrically activated to thereby individually shape the wavefront of each pixel in a virtual image.
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Patent Agency Ranking
公开(公告)号：US09946072B2
公开(公告)日：2018-04-17
申请号：US14926643
申请日：2015-10-29
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius
CPC classification number: G02B27/0172 , G02B5/1814 , G02B5/1842 , G02B6/0026 , G02B6/005 , G02B27/0081 , G02B27/286 , G02B27/42 , G02B27/4205 , G02B27/4261 , G02B27/4272 , G02B2027/0118 , G02B2027/0123 , G02B2027/0174 , G02B2027/0178 , G06F3/14
Abstract: In an optical display system having a waveguide and multiple diffractive optical elements (DOEs), an in-coupling DOE couples light into the waveguide, an intermediate DOE provides exit pupil expansion in a first direction, and an out-coupling DOE provides exit pupil expansion in a second direction and couples light out of the waveguide. The intermediate DOE includes grating features that are configured to rotate a state of polarization of light perturbations in the intermediate DOE that would otherwise generate optical interference through a closed-loop coupling phenomenon. The polarization state of a perturbed beam is rotated in the intermediate DOE to be orthogonal relative to the polarization state of the main beam used for image display to thereby uncouple the closed loops and make the perturbed beam non-interfering with the imaging beam.
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公开(公告)号：US09927614B2
公开(公告)日：2018-03-27
申请号：US14982385
申请日：2015-12-29
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius
CPC classification number: G02B27/0172 , G02B3/14 , G02B5/3025 , G02B27/0081 , G02B27/0955 , G02B27/4205 , G02B27/4261 , G02B27/4272 , G02B2027/0123 , G02B2027/0127 , G02B2027/014 , G02B2027/0178 , G02B2027/0185 , G02F1/29 , G02F2001/294 , G06T11/00
Abstract: A near-eye optical display system that may be utilized in augmented reality applications and devices includes a diffractive waveguide having diffractive optical elements (DOEs) configured for in-coupling, exit pupil expansion, and out-coupling. An electrically-modulated tunable liquid crystal (LC) lens is located between the diffractive grating and the eyes of the user. A polarizing filter is located on the other side of the diffractive grating so that light from the real world enters the system with a particular polarization state, for example, TM-polarized. The tunable LC lens is configured to impart variable focus on light that has an opposite polarization state, for example TE-polarized. The optical display system is arranged to be polarization-sensitive so that virtual images from an imager are out-coupled from the diffractive waveguide with TE-polarization. The tunable LC lens may thus impart variable focus to the virtual images due to the lens' sensitivity to TE-polarization.
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公开(公告)号：US09910276B2
公开(公告)日：2018-03-06
申请号：US14788174
申请日：2015-06-30
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius , Lauri Sainiemi , Tapani Levola , Marco Mattila
CPC classification number: G02B27/0101 , G02B5/1819 , G02B5/1852 , G02B27/0081 , G02B27/0172 , G02B27/4205 , G02B27/4272 , G02B2027/0125 , G02B2027/0178
Abstract: In an optical system that includes a waveguide with multiple diffractive optical elements (DOEs) incorporating diffraction gratings, light exiting a trailing edge of an upstream DOE enters a leading edge of a downstream DOE. One or more of the DOEs may include a leading and/or a trailing edge that have a graded profile. At a graded trailing edge of an upstream DOE, grating height smoothly decreases from full height to shallow height as a function of the proximity to the trailing edge. At a graded leading edge of the downstream DOE grating height smoothly increases from shallow height to full height as a function of distance away from the leading edge. By reducing a sharp boundary at the interface between the upstream and downstream DOEs, the graded profiles of the DOE edges enable optical resolution to be maintained decreasing sensitivity to misalignment between the DOEs that may occur during manufacturing.
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公开(公告)号：US20170153460A1
公开(公告)日：2017-06-01
申请号：US14955273
申请日：2015-12-01
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius , Pasi Petteri Pietilae
CPC classification number: G02B27/4205 , G02B27/0081 , G02B27/0172 , G02B27/4233 , G02B2027/0112 , G02B2027/0123 , G02B2027/014 , G02B2027/0178 , G06T19/006
Abstract: 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.
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公开(公告)号：US10670862B2
公开(公告)日：2020-06-02
申请号：US14790379
申请日：2015-07-02
Applicant: Microsoft Technology Licensing, LLC
Inventor： Tuomas Vallius , Lauri Sainiemi
Abstract: In an optical display system that includes a waveguide with multiple diffractive optical elements (DOEs), gratings in one or more of the DOEs may have an asymmetric profile in which gratings may be slanted or blazed. Asymmetric gratings in a DOE can provide increased display uniformity in the optical display system by reducing the “banding” resulting from optical interference that is manifested as dark stripes in the display. Banding may be more pronounced when polymeric materials are used in volume production of the DOEs to minimize system weight, but which have less optimal optical properties compared with other materials such as glass. The asymmetric gratings can further enable the optical system to be more tolerant to variations—such as variations in thickness, surface roughness, and grating geometry—that may not be readily controlled during manufacturing particularly since such variations are in the submicron range.
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