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：US20230048367A1

公开(公告)日：2023-02-16

申请号：US17877263

申请日：2022-07-29

Applicant: Facebook Technologies, LLC

Inventor： Jian Xu ,  Wen Xiong ,  Yang Yang ,  Wanli Chi

IPC: G03H1/22 ,  G02B5/32

Abstract: There are provided a volume Bragg grating and a method and a system for fabricating it. For instance, there is provided a system that includes a set of spatial light modulators configured to receive a light input. The light input can include a set of input paths where each input path in the set of input paths corresponds to a respective spatial light modulator from the set of spatial light modulators. The system can further include an input light processing module configured to condition an input light beam to output the light input to the set of spatial light modulators. The system can further include an optics module configured to receive a pattern originating from the set of spatial light modulators.

公开(公告)号：US11187904B2

公开(公告)日：2021-11-30

申请号：US16812084

申请日：2020-03-06

Applicant: Facebook Technologies, LLC

Inventor： Wanli Chi ,  Dominic Meiser ,  Yang Yang ,  Wai Sze Tiffany Lam ,  Pasi Saarikko

IPC: G02B27/01 ,  G02B27/44 ,  H04N9/31 ,  F21V8/00 ,  G02B27/00 ,  G02B1/11 ,  G02B27/42

Abstract: In a waveguide display, a first projector is configured to generate display light for a first field of view (FOV) of a display image. A first input coupler is configured to couple the display light for the first FOV into a visibly transparent substrate. A first set of gratings is configured to couple the display light for the first FOV out of the substrate at a first two-dimensional array of locations of the substrate. A second projector is configured to generate display light for a second FOV of the display image different from the first FOV. A second input coupler is configured to couple the display light for the second FOV into the substrate. A second set of gratings is configured to couple the display light for the second FOV out of the substrate at a second two-dimensional array of locations of the substrate.

公开(公告)号：US20210055554A1

公开(公告)日：2021-02-25

申请号：US16840118

申请日：2020-04-03

Applicant: Facebook Technologies, LLC

Inventor： Wanli Chi ,  Dominic Meiser ,  Yang Yang ,  Wai Sze Tiffany Lam ,  Pasi Saarikko ,  Ningfeng Huang

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

Abstract: A waveguide display includes a waveguide transparent to visible light, a first volume Bragg grating (VBG) on the waveguide and characterized by a first refractive index modulation, and a second reflection VBG on the waveguide and including a plurality of regions characterized by different respective refractive index modulations. The first reflection VBG is configured to diffract display light in a first wavelength range and a first field of view (FOV) range such that the display light in the first wavelength range and the first FOV range propagates in the waveguide through total internal reflection to the plurality of regions of the second reflection VBG. The plurality of regions of the second reflection VBG are configured to diffract the display light in different respective wavelength ranges within the first wavelength range and the first FOV range.

公开(公告)号：US20220128746A1

公开(公告)日：2022-04-28

申请号：US17125622

申请日：2020-12-17

Applicant: Facebook Technologies, LLC

Inventor： Wanli Chi ,  Yang Yang ,  Dominic Meiser ,  Wai Sze Tiffany Lam

IPC: G02B5/18 ,  F21V8/00 ,  G02B27/00 ,  G03F7/00

Abstract: An optical coupler includes a plurality of volume gratings in a substrate. The gratings include an array of fringes extending along length and thickness dimensions of the substrate. A difference between a refractive index of the fringes and a refractive index of the substrate depends on a depth coordinate along the thickness dimension of the substrate. A dependence of the difference on the depth coordinate has a bell-shaped function which suppresses ghost image formation due to optical crosstalk between gratings of neighboring spatial pitches.

公开(公告)号：US20220120946A1

公开(公告)日：2022-04-21

申请号：US17176964

申请日：2021-02-16

Applicant: Facebook Technologies, LLC

Inventor： Marvin Dion Alim ,  Austin Lane ,  Kavous Jorabchi ,  Yang Yang ,  Janee Ashley McNeil

IPC: G02B5/18 ,  G02B1/04 ,  G02B6/34

Abstract: A grating coupler may be fabricated by exposing a photopolymer layer to grating forming light for forming periodic refractive index variations in the photopolymer layer. The photopolymer layer may be exposed to apodization light for reducing an amplitude of the periodic refractive index variations in a spatially-selective manner. The apodization may also be achieved or facilitated by subjecting outer surface(s) of the photopolymer layer to a chemically reactive agent that causes the refractive index contrast to be reduced near the surface(s) of application. The apodized refractive index profile of the gratings facilitates the reduction of optical crosstalk between different gratings of the grating coupler.

公开(公告)号：US20210055555A1

公开(公告)日：2021-02-25

申请号：US16840119

申请日：2020-04-03

Applicant: Facebook Technologies, LLC

Inventor： Wanli Chi ,  Dominic Meiser ,  Yang Yang ,  Wai Sze Tiffany Lam ,  Pasi Saarikko

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

Abstract: A waveguide display includes a waveguide and a grating coupler configured to couple display light into or out of the waveguide. The grating coupler includes at least a first grating layer and a second grating layer arranged in a stack. The first grating layer is characterized by a first thickness and includes a first transmission VBG configured to diffract display light of a first wavelength from a first field of view. The second grating layer is characterized by a second thickness greater than the first thickness and includes a second transmission VBG configured to diffract display light of the first wavelength from a second field of view greater than the first field of view.

公开(公告)号：US20210055551A1

公开(公告)日：2021-02-25

申请号：US16681530

申请日：2019-11-12

Applicant: Facebook Technologies, LLC

Inventor： Wanli Chi ,  Dominic Meiser ,  Yang Yang ,  Wai Sze Tiffany Lam ,  Pasi Saarikko

IPC: G02B27/01 ,  G02B27/42 ,  G02B1/11 ,  F21V8/00

Abstract: A waveguide display includes a substrate transparent to visible light, a coupler configured to couple display light into the substrate as guided wave in the substrate, and a first VBG and a second VBG coupled to the substrate. The coupler includes a diffractive coupler, a refractive coupler, or a reflective coupler. The first VBG is configured to diffract, at a first region of the first VBG, the display light in the substrate to a first direction, and diffract, at two or more regions of the first VBG along the first direction, the display light from the first region to a second direction towards the second VBG. The second VBG is configured to couple the display light from each of the two or more regions of the first VBG out of the substrate at two or more regions of the second VBG along the second direction.