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公开(公告)号:WO2022046973A1
公开(公告)日:2022-03-03
申请号:PCT/US2021/047668
申请日:2021-08-26
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: AMIRSOLAIMANI, Babak , LEE, Yun-Han , WANG, Mengfei , MCELDOWNEY, Scott Charles , LU, Lu , WANG, Junren
Abstract: A device includes one or more light guides. The device also includes a first in-coupling element configured to couple a first light having a first input field of view ("FOV") into a first light guide, and a second in-coupling element configured to couple a second light having a second input FOV into a second light guide. The device also includes a first out-coupling element configured to couple the first light out of the first light guide as a first output light having a first output FOV, and a second out-coupling element configured to couple the second light out of the second light guide as a second output light having a second output FOV substantially non-overlapping with the first output FOV. A combination of the first output FOV and the second output FOV is larger than at least one of the first output FOV or the second output FOV.
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公开(公告)号:WO2020251758A1
公开(公告)日:2020-12-17
申请号:PCT/US2020/034754
申请日:2020-05-27
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: WHEELWRIGHT, Brian , LEE, Yun-Han , AMIRSOLAIMANI, Babak , GAO, Weichuan
Abstract: An optical assembly for projecting light from a display includes a first optical waveguide, a reflective optical element configured, and a first in-coupler. The reflective optical element is configured to receive first light having first polarization from the display and to reflect the first light as second light having second polarization distinct from the first polarization. The first in-coupler is coupled with the first optical waveguide. The first in-coupler is configured to receive and transmit the first light. The first in-coupler is further configured to receive the second light and redirect a first portion of the second light so that the first portion of the second light undergoes total internal reflection inside the first optical waveguide.
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公开(公告)号:WO2022076241A1
公开(公告)日:2022-04-14
申请号:PCT/US2021/052879
申请日:2021-09-30
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: SILVERSTEIN, Barry David , LU, Lu , LEE, Yun-Han , AMIRSOLAIMANI, Babak , WANG, Junren
Abstract: A method includes obtaining a mixture including a first composition and a second composition. The method also includes forming a layer based on the mixture. Ratios between an amount of the first composition and an amount of the second composition at at least two locations of the layer are different.
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公开(公告)号:WO2022040068A1
公开(公告)日:2022-02-24
申请号:PCT/US2021/046093
申请日:2021-08-16
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: AMIRSOLAIMANI, Babak , KOSHELEV, Alexander , DING, Yimin , WHEELWRIGHT, Brian , GREIF, Daniel Guenther , GAO, Weichuan , XU, Miaomiao , GOLLIER, Jacques
Abstract: A beam scanner and a display device is based on a photonic integrated circuit coupling light to a pair of opposed reflectors. One reflector is tiltable and has an opening through which the light is coupled, and the other reflector is configured to focus light, e.g. a concave reflector. A polarization folding configuration is used to cause the focused light propagate through the opening in the first reflector, get collimated by the second reflector, get scanned by the first reflector, and propagate through the second reflector to a pupil-replicating lightguide which provides multiple laterally offset parallel portions of the scanned beam.
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公开(公告)号:WO2021055298A1
公开(公告)日:2021-03-25
申请号:PCT/US2020/050782
申请日:2020-09-14
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: SULAI, Yusufu Njoni Bamaxam , LI, Gang , GENG, Ying , WHEELWRIGHT, Brian , GOLLIER, Jacques , AMIRSOLAIMANI, Babak , GAO, Weichuan , PENG, Fenglin , BONAR, James Ronald , FABIEN, Chloe Astrid Marie , MOHEGHI, Alireza , YAROSHCHUK, Oleg
IPC: G02B27/01 , G02B27/28 , G02B5/30 , G02F1/1335
Abstract: An optical assembly (700) includes a substrate (710) that has a first surface (710-1) and a second surface (710-2) that is opposite to and substantially parallel with the first surface, a reflector (712), and a volume Bragg grating (VBG). The VBG (714) is configured to transmit light incident upon the VBG at an incident angle that is within a first predetermined angular range and to reflect light that is incident upon the VBG at an incident angle that is within a second predetermined angular range distinct from the first angular range. The optical assembly is configured to transmit first light (492) received at the first surface in an optical path that includes reflection at the reflector and at the VBG. The optical assembly is also configured to transmit second light (490) received at the first surface such that the second light is output from the second surface without undergoing reflection at either the reflector or the VBG.
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公开(公告)号:WO2021066992A1
公开(公告)日:2021-04-08
申请号:PCT/US2020/049072
申请日:2020-09-02
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: GAO, Weichuan , WHEELWRIGHT, Brian , AMIRSOLAIMANI, Babak
Abstract: A beam scanner for near-eye display includes a beam-folded pupil relay configured for receiving a light beam reflected from a tiltable reflector and relaying the light beam to an exit pupil while preserving the beam angle of the reflected beam. The beam-folding pupil relay includes a beamsplitter, e.g. a polarization beam splitter configured to redirect the beam to a curved reflector, which sends the beam towards the exit pupil. Polarization of the light beam reflected from the curved reflector may be changed to an orthogonal polarization by a waveplate disposed in an optical path of the light beam between the polarization beam splitter and the curved reflector, enabling the reflected light beam to propagate through the polarization beam splitter towards the exit pupil. A pupil-replicating waveguide may be disposed proximate the exit pupil. A 2D tiltable reflector or a pair of 1D tiltable reflectors may be used.
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公开(公告)号:WO2021055297A2
公开(公告)日:2021-03-25
申请号:PCT/US2020/050776
申请日:2020-09-14
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: SULAI, Yusufu Njoni Bamaxam , LI, Gang , GENG, Ying , WHEELWRIGHT, Brian , GOLLIER, Jacques , AMIRSOLAIMANI, Babak , GAO, Weichuan , PENG, Fenglin , BONAR, James Ronald , FABIEN, Chloe Astrid Marie , MOHEGHI, Alireza , YAROSHCHUK, Oleg
IPC: G02B27/01 , G02B5/30 , G02B27/28 , G02F1/1335 , G02B2027/0118 , G02B2027/0174 , G02B2027/0178 , G02B2027/0187 , G02B27/0172 , G02B27/0176 , G02B27/10 , G02B27/106 , G02B27/283 , G02B3/08 , G02B5/0289 , G02B5/1819 , G02B5/3025 , G02B5/3041 , G02F1/1334 , G02F1/13345 , G02F1/133536 , G02F1/137 , H04N9/3152
Abstract: A display device includes an optical diffuser configured to, in response to receiving image light, output diffused image light (492) having a same polarization as the image light. The optical diffuser is also configured to transmit ambient light (490). The display device also includes an optical assembly (700) that includes a substrate (710), a reflector (712) coupled to the substrate, and a beam splitter (714) coupled to the substrate. The optical assembly is configured to transmit the diffused image light at a first optical power by reflecting the diffused image light at the reflector and at the beam splitter and to transmit the transmitted ambient light at a second optical power that is less than the first optical power without reflection at the reflector or the beam splitter. A method for transmitting light through the display device is also disclosed.
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公开(公告)号:WO2020167508A1
公开(公告)日:2020-08-20
申请号:PCT/US2020/016358
申请日:2020-02-03
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: AMIRSOLAIMANI, Babak , GENG, Ying , MCELDOWNEY, Scott, Charles
IPC: G02F1/1337 , G02B5/30
Abstract: A method for aligning a layer of photopolymers includes projecting light onto a rotating optical element and asymmetrically focusing the light transmitted through the rotating optical element onto a layer of photopolymers. The asymmetrically focused light is swept across different regions of the layer of photopolymers while a direction of polarization in the light is varied due to the rotation of the first optical element, producing a pattern of orientations for the layer of photopolymers. The method can be incorporated in a raster-scanning process to produce an alignment pattern in a layer of photopolymers with a large surface area, and is faster and provides improved precision and/or uniformity of the alignment pattern compared to currently available methods. An apparatus for aligning the layer of photopolymers is also disclosed.
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公开(公告)号:WO2020162929A1
公开(公告)日:2020-08-13
申请号:PCT/US2019/016880
申请日:2019-02-06
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: AMIRSOLAIMANI, Babak , GENG, Ying
Abstract: An optical film fabrication method, an optical film and a head-mounted display are provided. The optical film fabrication method comprises: providing a substrate having a curved surface; dispensing a photo-alignment (PAM) layer on the curved surface of the substrate and exposing the PAM layer to spatially-uniformly polarized light; dispensing a birefringent material layer on the PAM layer; and curing the birefringent material layer to form a birefringent film on the curved surface. An optic axis orientation of birefringent material molecules in the birefringent film are spatially uniform across the birefringent film.
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公开(公告)号:WO2019221875A1
公开(公告)日:2019-11-21
申请号:PCT/US2019/028452
申请日:2019-04-22
Applicant: FACEBOOK TECHNOLOGIES, LLC
Inventor: AMIRSOLAIMANI, Babak , SAARIKKO, Pasi , GENG, Ying , SULAI, Yusufu, Njoni, Bamaxam , MCELDOWNEY, Scott, Charles
IPC: G02B27/00
Abstract: An optical system includes an optical waveguide, and a first optical element configured to direct a first ray, having a first circular polarization and impinging on the first optical element at a first incidence angle, in a first direction so that the first ray propagates through the optical waveguide via total internal reflection toward a second optical element. The first optical element is configured to also direct a second ray, having a second circular polarization that is distinct from the first circular polarization and impinging on the first optical element at the first incidence angle, in a second direction that is distinct from the first direction so that the second ray propagates away from the second optical element. The second optical element is configured to direct the first ray propagating through the optical waveguide toward a detector.