公开(公告)号：US20210255490A1

公开(公告)日：2021-08-19

申请号：US16839634

申请日：2020-04-03

Applicant: Facebook Technologies, LLC

Inventor： Maxwell Parsons ,  Shane Colburn ,  Yingfei Jiang ,  Andrew Maimone ,  Erik Shipton ,  Guohua Wei ,  Oleg Yaroshchuk

IPC: G02F1/137 ,  G02F1/1343 ,  G02F1/1335 ,  G02F1/1337 ,  G03H1/22

Abstract: A tunable liquid crystal (LC) device includes an LC layer between a pair of reflectors forming an optical cavity. The reflectors include conductive layers for applying an electrical signal to the LC layer. One of the conductive layers may include an array of conductive pixels for spatially selective control of the effective refractive index of the LC layer. The phase delay introduced by the LC layer may be greatly increased or magnified by placing the LC layer into the optical cavity. This enables a substantial reduction of the LC layer thickness, which in its turn enables very tight pitches of the LC pixels, with a reduced inter-pixel crosstalk caused by fringing electric fields, as well as faster switching times. A tight-pitch, fast LC device may be used as a configurable hologram or a spatial light modulator.

公开(公告)号：US20210109343A1

公开(公告)日：2021-04-15

申请号：US16597309

申请日：2019-10-09

Applicant: Facebook Technologies, LLC

Inventor： Weichuan Gao ,  Brian Wheelwright ,  Maxwell Parsons ,  Daniel Guenther Greif ,  Scott Charles McEldowney

IPC: G02B26/10 ,  G02B27/28 ,  G02B26/08 ,  G02B27/00

Abstract: A scanning projector for a display apparatus includes a first scanning reflector configured to steer a light beam in a first plane, a second scanning reflector configured to steer the light beam received from the first scanning reflector in a second plane, and beam relay optics configured to relay a first pupil defined at the first scanning reflector to a second pupil defined at the second scanning reflector, and to relay the second pupil to an output pupil of the scanning projector. The beam relay optics may include a concave reflector and a polarization beam splitter coupled to a scanning reflector in a triple pass configuration.

公开(公告)号：US10690919B1

公开(公告)日：2020-06-23

申请号：US15896392

申请日：2018-02-14

Applicant: Facebook Technologies, LLC

Inventor： Yijing Fu ,  Wanli Chi ,  Pasi Saarikko ,  Xinqiao Liu ,  Hee Yoon Lee ,  Maxwell Parsons

IPC: F21V8/00 ,  G02B26/10 ,  G02B27/01

Abstract: A waveguide display includes a light source, a scanning mirror assembly, an output waveguide, and a controller. The light source emits image light. The scanning mirror assembly scans the image light as scanned image light to particular locations in accordance with scanning instructions. The output waveguide includes an input area and an output area. The output waveguide receives the scanned image light emitted from the scanning mirror assembly at the input area, and output expanded image light from a portion of the output area, the location of the portion of the output area based in part on a direction of the scanned image light output from the scanning mirror assembly. The controller generates the scanning instructions and provides the scanning instructions to the scanning mirror assembly.

公开(公告)号：US20230176377A1

公开(公告)日：2023-06-08

申请号：US17671446

申请日：2022-02-14

Applicant: Facebook Technologies, LLC

Inventor： Sihui He ,  Jacques Gollier ,  Maxwell Parsons ,  Babak Amirsolaimani ,  Wanli Guenther Chi ,  Daniel Guenther Grief ,  Renate Eva Klementine Landig ,  Xiayu Feng ,  Zhimin Shi ,  Nicholas John Diorio ,  Yang Yang ,  Giuseppe Calafiore ,  Fenglin Peng ,  Tanya Malhotra ,  Andrew John Ouderkirk

IPC: G02B27/01 ,  G02B27/00 ,  G02F1/1335 ,  G02B26/08

CPC classification number: G02B27/0172 ,  G02B26/0816 ,  G02B27/0093 ,  G02F1/133504 ,  G02B2027/0174 ,  G02B2027/0178

Abstract: A directional illuminator for a display apparatus includes a switchable diffuser for tuning a divergence of a light beam illuminating a display panel of the display apparatus. The tunable divergence of the illuminating light beam translates into a tunable exit pupil size at the eyebox of the display apparatus, which may be matched to a pupil size of a user’s eye, thus providing a configurable illumination of the eye pupil. A tiltable reflector in an optical path of the illuminating light beam may be used to shift the location of the exit pupil at the eyebox of the display apparatus.

公开(公告)号：US20230176368A1

公开(公告)日：2023-06-08

申请号：US17701558

申请日：2022-03-22

Applicant: Facebook Technologies, LLC

Inventor： Sihui He ,  Maxwell Parsons ,  Babak Amirsolaimani ,  Wanli Chi ,  Daniel Guenther Greif ,  Renate Eva Klementine Landig ,  Xiayu Feng ,  Zhimin Shi ,  Nicholas John Diorio ,  Yang Yang ,  Giuseppe Calafiore ,  Fenglin Peng ,  Tanya Malhotra ,  Andrew John Ouderkirk

IPC: G02B27/00 ,  G02B27/42 ,  G02B27/01 ,  G02F1/29 ,  G02F1/33 ,  H04N5/232 ,  G06F3/01 ,  G06T3/40 ,  G01B11/22 ,  G01S17/10 ,  G01S7/4865

CPC classification number: G02B27/0081 ,  G02B27/4205 ,  G02B27/0172 ,  G02B27/0093 ,  G02F1/292 ,  G02F1/33 ,  H04N5/23238 ,  G06F3/013 ,  G06T3/4038 ,  G01B11/22 ,  G01S17/10 ,  G01S7/4865 ,  G02B2027/0178 ,  G02B2027/0138 ,  G02B2027/0174 ,  H04N9/04

Abstract: A field of view of an imaging or ranging device may be increased multiple times by providing a switchable diffraction grating structure upstream of an imaging camera or ranging light source. The switchable diffraction grating changes the angle of propagating of incoming light by a fixed step, enabling the device to switch between several portions of a compound field of view. The switchable diffraction grating structure may be supported by a lightguide that guides the image light or ranging light by a series of reflections from opposed surfaces of the lightguide.

公开(公告)号：US20230176274A1

公开(公告)日：2023-06-08

申请号：US17699012

申请日：2022-03-18

Applicant: Facebook Technologies, LLC

Inventor： Sihui He ,  Jacques Gollier ,  Maxwell Parsons ,  Babak Amirsolaimani ,  Wanli Chi ,  Daniel Guenther Greif ,  Renate Eva Klementine Landig ,  Xiayu Feng ,  Zhimin Shi ,  Nicholas John Diorio ,  Yang Yang ,  Giuseppe Calafiore ,  Fenglin Peng ,  Tanya Malhotra ,  Andrew John Ouderkirk

IPC: F21V8/00 ,  G02F1/29

CPC classification number: G02B6/005 ,  G02B6/0031 ,  G02F1/294

Abstract: An illuminator for a display panel includes a slab of transparent material for propagating illuminating light between outer surfaces of the slab, an out-coupler supported by the slab for out-coupling portions of the illuminating light along one of the outer surfaces of the slab, and a tunable microlens array for forming an array of light spots from the out-coupled illuminating light portions downstream of the focusing element for illuminating pixels of the display panel. The array of light spots may be repeated at a distance from the tunable microlens array due to Talbot effect. The display panel may be illuminated in a color-sequential manner, and the tunable microlens array may be used to adjust the focal plane position for each color channel individually.

公开(公告)号：US11280956B1

公开(公告)日：2022-03-22

申请号：US17179000

申请日：2021-02-18

Applicant: Facebook Technologies, LLC

Inventor： Maxwell Parsons ,  Giuseppe Calafiore ,  Wanli Chi

IPC: G02B27/14 ,  F21V8/00 ,  G02B6/00 ,  G02B27/01 ,  G02B27/10 ,  B32B27/06 ,  B32B7/12 ,  B32B37/12 ,  B32B37/18

Abstract: A waveguide includes an input area, a multi-layered substrate, and an output area. The multi-layered substrate includes a plurality of layers of at least a substrate and at least one partially reflective layers. The input area in-couples light in a first band into the waveguide. The one or more partially reflective layers are partially reflective to light in the first band. Each of the one or more partially reflective layers are located between respective layers of the plurality of layers of the substrate. The output area out-couples light from the waveguide. The pupil replication density of the out-coupled light is based in part on a number of the one or more partially reflective layers and respective locations of the one or more partially reflective layers in the waveguide.

公开(公告)号：US20210364808A1

公开(公告)日：2021-11-25

申请号：US17009227

申请日：2020-09-01

Applicant: Facebook Technologies, LLC

Inventor： Alexander Koshelev ,  Giuseppe Calafiore ,  Maxwell Parsons

IPC: G02B27/01 ,  F21V8/00 ,  G02B27/30 ,  G02B5/30

Abstract: A thin-profile light source capable of providing polychromatic collimated light is disclosed. A waveguide propagates light along an optical path in the waveguide core. A top cladding of the waveguide is thinned so as to have a tail of the light mode propagating in the waveguide reach the end of the top cladding. A light extracting element is coupled to the top cladding. Light leaks out of the top cladding evanescently at an angle defined by a ratio of the refractive index of the light extracting element to an effective refractive index for the light mode propagating in the waveguide.

公开(公告)号：US11137605B1

公开(公告)日：2021-10-05

申请号：US16796008

申请日：2020-02-20

Applicant: Facebook Technologies, LLC

Inventor： Stephen John Holmes ,  Wanli Chi ,  Maxwell Parsons ,  Jasmine Soria Sears

IPC: G02B27/01 ,  G02B5/30 ,  G06F1/16 ,  G06F3/01 ,  G06F3/00

Abstract: A near-eye display assembly presented herein includes an electronic display, an optical assembly, and scanning assembly. The electronic display has a first resolution. The optical assembly controls a field of view at an eye box and directs a plurality of light rays emitting from the electronic display toward the eye box. The scanning assembly shifts a direction of at least one of the light rays in accordance with emission instructions such that a virtual display is presented to the eye box, the virtual display having a second resolution greater than the first resolution. The display assembly can be implemented as a component of a head-mounted display of an artificial reality system.

公开(公告)号：US10983257B1

公开(公告)日：2021-04-20

申请号：US16198099

申请日：2018-11-21

Applicant: Facebook Technologies, LLC

Inventor： Matthew E. Colburn ,  Giuseppe Calafiore ,  Matthieu Charles Raoul Leibovici ,  Maxwell Parsons

IPC: H01L21/308 ,  H01L21/306 ,  G03F7/00 ,  G02B5/18 ,  G02B27/01 ,  F21V8/00

Abstract: A lithographic patterning of a resist is performed to create a mandrel over a substrate. A deposition of one or more functional materials on the mandrel is performed. And each functional material has a respective refractive index. A selective removal of the mandrel is performed to create a plurality of grating elements formed from the one or more functional materials. The plurality of grating elements are self-aligned and form a diffraction grating. Each grating element may have a heterogenous refractive index (e.g., substantial normal to and/or parallel to a surface of the substrate). The diffraction grating may be used in a near-eye display.