公开(公告)号：WO2022120250A1

公开(公告)日：2022-06-09

申请号：PCT/US2021/061916

申请日：2021-12-04

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： PENG, Fenglin ,  GENG, Ying ,  KOSHELEV, Alexander ,  CALAFIORE, Giuseppe ,  RAO, Linghui ,  GOLLIER, Jacques ,  LEE, Yun-Han ,  LU, Lu

IPC: G02B30/33 ,  F21V8/00 ,  H04N13/351

Abstract: A display panel (102) has an array of pixels (103) backlighted by a backlight (104) including a lightguide (106) and a plurality of out- coupling gratings (112). The locations of the out-coupling gratings (112) are coordinated with positions of pixels in the array of pixels (103). The backlight (104) may include a light-conducting transparent slab (106) or an array of linear waveguides (207) running parallel to the rows of the pixel array (103), with the gratings (112) formed in the slab (106) or in the waveguide (207). Wavelength composition and polarization of the light emitted by the waveguide may be matched to the transmission spectral bands and transmission polarization of the display panel (102).

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

IPC: G02B6/12 ,  G02B26/08 ,  G02B26/10 ,  G02B27/00 ,  G02B27/01 ,  G02B27/28

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.

公开(公告)号：WO2021201974A1

公开(公告)日：2021-10-07

申请号：PCT/US2021/016661

申请日：2021-02-04

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： KOSHELEV, Alexander ,  CALAFIORE, Giuseppe

IPC: G02B27/01 ,  F21V8/00 ,  G02B2006/12159 ,  G02B2027/0118 ,  G02B2027/0125 ,  G02B2027/015 ,  G02B2027/0174 ,  G02B26/103 ,  G02B27/0101 ,  G02B27/0172 ,  G02B27/0176 ,  G02B27/1006 ,  G02B6/0016 ,  G02B6/0018 ,  G02B6/0038 ,  G02B6/0043 ,  G02B6/0056 ,  G02B6/12007 ,  G02B6/28 ,  G02B6/3548 ,  G02B6/3596 ,  G02F1/3137

Abstract: A device for providing a 1D line of an image is disclosed. The device is based on a thin slab waveguide coupled to a beam redirecting device such as a tiltable mirror MEMS scanner, a waveguide-based phased array, or a waveguide-based optical switch switching image light between waveguides of a waveguide array coupled to a collimating element formed in the low-mode slab waveguide. The image may be formed by scanning a collimated beam propagating in the slab waveguide, or by forming the 1D singular distribution of brightness at a same time. The device may be used in a near-eye display for forming a 2D image in angular domain.

公开(公告)号：WO2022120253A1

公开(公告)日：2022-06-09

申请号：PCT/US2021/061919

申请日：2021-12-04

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： PENG, Fenglin ,  GENG, Ying ,  LU, Lu ,  LEE, Yun-Han ,  KOSHELEV, Alexander ,  CALAFIORE, Giuseppe ,  GOLLIER, Jacques

IPC: G02B5/18 ,  G02B27/01

Abstract: A display device with a transparent illuminator and an liquid crystal (LC) display panel is disclosed. The transparent illuminator includes a light source and a transparent lightguide, which may be based on a slab of transparent material with zigzag light propagation of the illuminating light in the slab and/or a transparent photonic integrated circuit with singlemode ridge waveguides for spreading the illuminating light in a plane parallel to the plane of LC display panel. The lightguide includes a plurality of grating out-couplers whose position is coordinated with positions of LC pixels for higher throughput. A reflective offset-to-angle optical element may be provided to form an image in angular domain through the LC panel and through the transparent illuminator, resulting in an overall compact and efficient display configuration.

公开(公告)号：WO2020131827A1

公开(公告)日：2020-06-25

申请号：PCT/US2019/066775

申请日：2019-12-17

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： MAIMONE, Andrew ,  OUDERKIRK, Andrew, John ,  LEE, Hee, Yoon ,  HUANG, Ningfeng ,  PARSONS, Maxwell ,  MCELDOWNEY, Scott, Charles ,  AMIRSOLAIMANI, Babak ,  SAARIKKO, Pasi ,  CHI, Wanli ,  CALAFIORE, Giuseppe ,  KOSHELEV, Alexander ,  SILVERSTEIN, Barry, David ,  LU, Lu ,  LAM, Wai, Sze Tiffany ,  LI, Gang ,  LUTGEN, Stephan ,  OLIVIER, Francois ,  MASSOUBRE, David

IPC: F21V8/00 ,  G02B27/00 ,  G02B27/01 ,  G02F1/01

Abstract: 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.

公开(公告)号：WO2022098709A1

公开(公告)日：2022-05-12

申请号：PCT/US2021/057835

申请日：2021-11-03

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： CALAFIORE, Giuseppe ,  KOSHELEV, Alexander

IPC: F21V8/00 ,  G02B6/10 ,  G02B27/01

Abstract: A compact collimator or projector includes a waveguide (900) having a slab core structure (908) supporting at least two lateral modes of propagation. A light beam (105) coupled into a first mode (911) propagates to an edge (931) of the waveguide (900) where it is reflected by a reflector (921) to propagate back. Upon propagation back and forth, the light is converted into a second mode (912). An out-coupling region (914), such as an evanescent coupler, is provided to out-couple the light propagating in the second mode. The reflector (921) may have focusing power to collimate the out-coupled light beam. The light beam may be converted from the first to the second mode without being reflected from a reflector.

公开(公告)号：WO2021202019A1

公开(公告)日：2021-10-07

申请号：PCT/US2021/019710

申请日：2021-02-25

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： KOSHELEV, Alexander ,  CALAFIORE, Giuseppe

IPC: G02B27/01 ,  F21V8/00 ,  G02B2006/12159 ,  G02B2027/0118 ,  G02B2027/0125 ,  G02B2027/015 ,  G02B2027/0174 ,  G02B26/103 ,  G02B27/0101 ,  G02B27/0172 ,  G02B27/0176 ,  G02B27/1006 ,  G02B6/0016 ,  G02B6/0018 ,  G02B6/0038 ,  G02B6/0043 ,  G02B6/0056 ,  G02B6/12007 ,  G02B6/28 ,  G02B6/3548 ,  G02B6/3596 ,  G02F1/3137

Abstract: A device for redirecting light in two dimensions (2D) includes a wavelength-tunable light source for providing light having a spectral component at a first wavelength. A 1D redirector redirects the light in a first plane. A thin waveguide is disposed in the first plane. The thin waveguide includes a slab waveguide portion coupled to the 1D redirector for propagating light redirected by the 1D redirector. The slab waveguide portion includes a wavelength-sensitive out-coupler out-coupling the light in a second plane at an angle dependent on the first wavelength. Thus, the light is redirected in two dimensions. A display device providing image in angular domain may be based on the device for redirecting light in two dimensions.

公开(公告)号：WO2021201972A1

公开(公告)日：2021-10-07

申请号：PCT/US2021/016631

申请日：2021-02-04

Applicant: FACEBOOK TECHNOLOGIES, LLC

Inventor： KOSHELEV, Alexander ,  CALAFIORE, Giuseppe

IPC: G02B27/01 ,  F21V8/00 ,  G02B2006/12159 ,  G02B2027/0118 ,  G02B2027/0125 ,  G02B2027/015 ,  G02B2027/0174 ,  G02B26/103 ,  G02B27/0101 ,  G02B27/0172 ,  G02B27/0176 ,  G02B27/1006 ,  G02B6/0016 ,  G02B6/0018 ,  G02B6/0038 ,  G02B6/0043 ,  G02B6/0056 ,  G02B6/12007 ,  G02B6/28 ,  G02B6/3548 ,  G02B6/3596 ,  G02F1/3137

Abstract: A device for providing a 1D line of an image is disclosed. The device includes a wavelength-tunable light source for providing image light having the angular distribution encoded in optical spectrum. The device further includes a thin slab waveguide having an out-coupler in form of a diffraction grating for out-coupling the image light at an angle dependent on wavelength. The image may be formed by scanning a collimated beam propagating in the slab waveguide when using tunable monochromatic light sources, or by forming the 1D singular distribution of brightness at a same time when using a tunable-spectrum light sources. The device may be used in a near-eye display for forming a 2D image in angular domain.