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公开(公告)号：US20230341684A1
公开(公告)日：2023-10-26
申请号：US17727658
申请日：2022-04-22
发明人： Jilin Yang , Hee Yoon Lee
CPC分类号： G02B27/0172 , G02B6/29316 , G02B6/3532
摘要： A pupil-replicating lightguide includes an in-coupling grating structure, an out-coupling grating structure, and a phase compensation layer. The out-coupling grating structure has a spatially varying parameter such as grating duty cycle or grating thickness for evening out out-coupled distribution of light. The spatially varying out-coupling grating parameter disturbs the phase of the propagating image light. The phase compensation layer has a spatially varying optical thickness that compensates that disturbed phase to planarize an optical phase profile of out-coupled light, thereby improving a modulation transfer function of the pupil-replicating lightguide.
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公开(公告)号：US11407731B2
公开(公告)日：2022-08-09
申请号：US17064251
申请日：2020-10-06
发明人： Ganghun Kim , Andrew Maimone , Alexander Jobe Fix , Robert Dale Cavin , Hee Yoon Lee , Matthieu Charles Raoul Leibovici , Brian Wheelwright , Douglas Robert Lanman
IPC分类号： C07D401/04 , A01N43/50 , A01N43/90 , A01N53/00 , A01N43/54 , C07D401/14 , C07D405/14 , C07D487/04 , C07D498/04
摘要： A system for making a holographic medium for use in generating light patterns for eye tracking includes a light source configured to provide light and a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light. The system also includes a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium and one or more diffractive optical elements configured to receive the second portion of the light and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium.
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公开(公告)号：US20210124108A1
公开(公告)日：2021-04-29
申请号：US16740082
申请日：2020-01-10
发明人： Hee Yoon Lee
摘要： A display waveguide configured for conveying polychromatic image light to a viewer includes a substrate and a higher-index layer supported by the substrate. The high-index layer supports the transmission of the longer-wavelength color channel of the image light in at least a portion of the field of view.
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公开(公告)号：US10942378B2
公开(公告)日：2021-03-09
申请号：US16890607
申请日：2020-06-02
发明人： Andrew Maimone , Andrew Ouderkirk , Hee Yoon Lee , Ningfeng Huang , Maxwell Parsons , Scott Charles McEldowney , Babak Amirsolaimani , Pasi Saarikko , Wanli Chi , Giuseppe Calafiore , Alexander Koshelev , Barry David Silverstein , Lu Lu , Wai Sze Tiffany Lam , Gang Li , Stephan Lutgen , Francois Olivier , David Massoubre
摘要： A pupil-replicating waveguide suitable for operation with a coherent light source is disclosed. A waveguide body has opposed surfaces for guiding a beam of image light. An out-coupling element is disposed in an optical path of the beam for out-coupling portions of the beam at a plurality of spaced apart locations along the optical path. Electrodes are coupled to at least a portion of the waveguide body for modulating an optical path length of the optical path of the beam to create time-varying phase delays between the portions of the beam out-coupled by the out-coupling element.
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公开(公告)号：US10928635B1
公开(公告)日：2021-02-23
申请号：US16379703
申请日：2019-04-09
发明人： Nicholas Daniel Trail , Andrew John Ouderkirk , Pasi Saarikko , Sharvil Shailesh Talati , Hee Yoon Lee , Behnam Bastani
摘要： A headset includes a display assembly. The display assembly has a primary portion and a peripheral portion. The primary portion of the display assembly is configured to emit a first portion of image light, and has a first field of view (FOV). The peripheral portion of the display assembly is configured to emit a second portion of the image light over a second FOV, and the peripheral portion is canted relative to the primary portion. The emitted first portion of image light and the emitted second portion of image light create a composite FOV from the perspective of an eyebox, and a seam between the first FOV and the second FOV is located in a peripheral region of the composite FOV.
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公开(公告)号：US10761330B2
公开(公告)日：2020-09-01
申请号：US16209719
申请日：2018-12-04
发明人： Hee Yoon Lee , Ningfeng Huang , Eric Fest , Pasi Saarikko , Erik Shipton , Giuseppe Calafiore
摘要： A waveguide display includes a first substrate and one or more grating layers on a first surface of the first substrate. The one or more grating layers are configured to cause destructive interference between ambient light diffracted by at least two grating layers or between ambient light diffracted by different portions of one grating layer. In some embodiments, the waveguide display also includes an angular-selective transmissive layer. The angular-selective transmissive layer is configured to reflect, diffract, or absorb ambient light incident on the angular-selective reflective layer with an incidence angle greater than a threshold value.
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公开(公告)号：US10534176B1
公开(公告)日：2020-01-14
申请号：US15727873
申请日：2017-10-09
发明人： Wanli Chi , Hee Yoon Lee
摘要： A waveguide display is used for presenting media to a user. The waveguide display includes a light source assembly, an output waveguide, and a controller. The light source assembly projects an image light at least along one dimension. The output waveguide includes a waveguide body with two opposite surfaces. The output waveguide includes an input area, an output area, a first diffractive element on the first side, and a second diffractive element on the second side of the output waveguide. The output area is located between the input area and the first and second diffractive elements. The first and second diffractive elements reflect a second portion of the expanded image light back toward the output area for outcoupling to the eyebox. The controller controls the scanning of the light source assembly to form a two-dimensional image.
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公开(公告)号：US10295723B1
公开(公告)日：2019-05-21
申请号：US15968576
申请日：2018-05-01
发明人： Hee Yoon Lee , Wanli Chi , Pasi Saarikko
摘要： 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.
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公开(公告)号：US20220229396A1
公开(公告)日：2022-07-21
申请号：US17658048
申请日：2022-04-05
摘要： Techniques disclosed herein relate to modifying refractive index modulation in a holographic optical element, such as a holographic grating. According to certain embodiments, a holographic optical element or apodized grating includes a polymer layer comprising a first region characterized by a first refractive index and a second region characterized by a second refractive index. The holographic optical element or apodized grating includes a plurality of nanoparticles dispersed in the polymer layer. The nanoparticles have a higher concentration in either the first region or the second region. In some embodiments, the nanoparticles may be configured to increase the refractive index modulation. In some embodiments, the nanoparticles may be configured to apodize the grating by decreasing the refractive index modulation proximate to sides of the grating. The refractive index may be modulated by applying a monomer reservoir buffer layer to the polymer layer, either before or after hologram fabrication.
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公开(公告)号：US11099309B2
公开(公告)日：2021-08-24
申请号：US16549567
申请日：2019-08-23
发明人： Hee Yoon Lee , Ningfeng Huang , Pasi Saarikko , Yu Shi , Giuseppe Calafiore , Nihar Ranjan Mohanty
摘要： A pupil replication waveguide for a projector display includes a slab of transparent material for propagating display light in the slab via total internal reflection. A diffraction grating is supported by the slab. The diffraction grating includes a plurality of tapered slanted fringes in a substrate for out-coupling the display light from the slab by diffraction into a blazed diffraction order. A greater portion of the display light is out-coupled into the blazed diffraction order, and a smaller portion of the display light is out-coupled into a non-blazed diffraction order. The tapered fringes result in the duty cycle of the diffraction grating varying along the thickness direction of the diffraction grating, to facilitate suppressing the portion of the display light out-coupled into the non-blazed diffraction order.
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