公开(公告)号：US20230258938A1

公开(公告)日：2023-08-17

申请号：US17674573

申请日：2022-02-17

Applicant: META PLATFORMS TECHNOLOGIES, LLC

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

IPC: G02B27/01

CPC classification number: G02B27/0172 ,  G02B2027/0116 ,  G02B2027/011 ,  G02B2027/0138

Abstract: According to examples, a display system may include a wearable eyewear arrangement that may include a lens assembly having a projector to propagate display light associated with an image. The lens assembly may also include a waveguide configuration for propagating the display light to an eyebox. The waveguide configuration may include a volume Bragg grating (VBG) component for propagating the display light from a projector to an eyebox. The VBG component may include at least one tilt adjusted grating facilitated by adjustment in an original grating vector (k) direction of a grating by a pre-determined value. The tilt adjusted grating may facilitate to mitigate a rainbow effect observable in a gazing direction of the eyebox. The rainbow effect may be mitigated by modification of a rainbow ghost path away from the gazing direction without affecting propagation of the image pertaining to the display light.

公开(公告)号：US11709358B2

公开(公告)日：2023-07-25

申请号：US17184312

申请日：2021-02-24

Applicant: Meta Platforms Technologies, LLC

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

IPC: G02B27/01 ,  G02B27/14 ,  G06T11/60 ,  A61B3/12 ,  G02B27/42

CPC classification number: G02B27/0103 ,  G02B27/0172 ,  G02B27/4261 ,  G02B2027/0105 ,  G02B2027/0174 ,  G02B2027/0178

Abstract: A waveguide display includes a waveguide and a staircase structure coupled to the waveguide. The waveguide includes a first substrate, a second substrate, and a holographic material layer between the first substrate and the second substrate. The holographic material layer includes a first grating and a second grating. The staircase structure is positioned on top of at least a portion of the first grating but not on top of the second grating. The staircase structure includes an input grating that is on top of the first grating and is configured to couple display light into the waveguide. The first grating is configured to redirect the display light coupled into the waveguide by the input grating towards the second grating.

公开(公告)号：US20230213761A1

公开(公告)日：2023-07-06

申请号：US17569349

申请日：2022-01-05

Applicant: Meta Platforms Technologies, LLC

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

IPC: G02B27/00 ,  G02B27/01 ,  G02B27/42 ,  F21V8/00 ,  G02C5/14 ,  G02C11/00

CPC classification number: G02B27/0037 ,  G02B6/005 ,  G02B6/0023 ,  G02B27/0172 ,  G02B27/4205 ,  G02C5/14 ,  G02C11/10 ,  G02B2027/0178

Abstract: According to examples, a display system may include a wearable eyewear arrangement that may include a lens assembly having a projector to propagate display light associated with an image. The lens assembly may also include a waveguide for propagating the display light to an eyebox, in which the waveguide may include a plurality of gratings through which the first display light is sequentially propagated and in which at least one of the plurality of gratings is oriented to propagate the display light to a next grating while reducing an appearance of a ghost image of the image on the eyebox.