公开(公告)号：US20220155623A1

公开(公告)日：2022-05-19

申请号：US17648511

申请日：2022-01-20

Applicant: DigiLens Inc.

Inventor： Jonathan David Waldern ,  Alastair John Grant ,  Milan Momcilo Popovich ,  Shibu Abraham ,  Baeddan George Hill ,  Tsung-Jui Ho

IPC: G02F1/13 ,  G02B5/18

Abstract: Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs and Bragg gratings, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated Bragg gratings (EBGs). EBGs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removing the liquid crystal from the cured grating provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.

公开(公告)号：US11300795B1

公开(公告)日：2022-04-12

申请号：US17027562

申请日：2020-09-21

Applicant: Rockwell Collins, Inc. ,  DIGILENS, INC.

Inventor： James H. Stanley ,  Jonathan David Waldern ,  Milan Momcilo Popovich ,  Alastair John Grant ,  Steven J. Robbins

IPC: G02B27/01 ,  G02B5/18 ,  G02B27/10

Abstract: A near eye optical display includes a waveguide comprising a first surface and a second surface, an input coupler, a fold grating, and an output grating. The input coupler is configured to receive collimated light from a display source and to cause the light to travel within the waveguide via total internal reflection between the first surface and the second surface to the fold grating; the fold grating is configured to provide pupil expansion in a first direction and to direct the light to the output grating via total internal reflection between the first surface and the second surface; and the output grating is configured to provide pupil expansion in a second direction different than the first direction and to cause the light to exit the waveguide from the first surface or the second surface.

公开(公告)号：US20220099898A1

公开(公告)日：2022-03-31

申请号：US17410828

申请日：2021-08-24

Applicant: DigiLens Inc.

Inventor： Jonathan David Waldern ,  Alastair John Grant ,  Hyesog Lee ,  Gerald Buxton ,  Milan Momcilo Popovich

IPC: G02B6/35 ,  F21V8/00 ,  G02B6/02 ,  G02B27/00

Abstract: Multiplexed reflection and transmission gratings, and methods of their manufacture, are provided that improve uniformity with laser light, that is, reduced banding and other illumination artifacts occurring in waveguides. The mechanism for this can be the multiple reflections between the waveguide reflecting surfaces and the reflection hologram, which promote illumination averaging as beam propagation processes within a waveguide. In some gratings, a beam splitter layer overlapping the multiplexed gratings can be provided for the purposes of reducing banding in a laser-illuminated waveguide. The beam splitter can be provided by one or more dielectric layers. The beamsplitter can have sensitivity to one polarization. The beamsplitter can be sensitive to S-polarization. The beam splitter can be an anti-reflection coating optimized for normal incidence that becomes reflective at high TIR angles when immersed in glass or plastic.

公开(公告)号：US20210405299A1

公开(公告)日：2021-12-30

申请号：US17328727

申请日：2021-05-24

Applicant: DigiLens Inc.

Inventor： Alastair John Grant ,  Jonathan David Waldern ,  Milan Momcilo Popovich ,  Sihui He ,  Edward Lao ,  Roger Allen Conley Smith

IPC: G02B6/34 ,  G02B27/01 ,  F21V8/00

Abstract: Systems and methods for providing holographic waveguide display using integrated gratings in accordance with various embodiments of the invention are illustrated. One embodiment includes a waveguide display including a source of light, and a first waveguide including a grating structure including first and second gratings, and an input coupler configured to couple a first field-of-view portion of light, and couple a second field-of-view portion of light, wherein the first grating is configured to provide beam expansion in a first direction for the first field-of-view portion of light, and provide beam expansion in the first direction and beam extraction towards a viewer for the second field-of-view portion of light, the second grating is configured to provide beam expansion in a second direction for the second field-of-view portion of light, and provide beam expansion in the second direction and beam extraction towards a viewer for the first field-of-view portion of light.

公开(公告)号：US20210396998A1

公开(公告)日：2021-12-23

申请号：US17167903

申请日：2021-02-04

Applicant: DigiLens Inc.

Inventor： Jonathan David Waldern ,  Milan Momcilo Popovich ,  Alastair John Grant

IPC: G02B27/01 ,  F21V8/00

Abstract: Systems and methods for generating head-up displays (HUDs) using waveguides incorporating Bragg gratings in accordance with various embodiments of the invention are provided. The term HUD is typically utilized to describe a class of displays that incorporates a transparent display that presents data without requiring users to look away from their usual viewpoints. HUDs can be incorporated in any of a variety of applications including (but not limited to) vehicular and near-eye applications, such as googles, eyewear, etc. HUDs that utilize planar waveguides that incorporate Bragg gratings in accordance with various embodiments of the invention can achieve significantly larger fields of view and have lower volumetric requirements than HUDs implemented using conventional optical components.

公开(公告)号：US11194098B2

公开(公告)日：2021-12-07

申请号：US16734208

申请日：2020-01-03

Applicant: DigiLens Inc. ,  Rockwell Collins Inc.

Inventor： Jonathan David Waldern ,  Alastair John Grant ,  Milan Momcilo Popovich ,  James H. Stanley ,  Robert D. Brown

IPC: G02B6/34 ,  G02B5/18 ,  G02B27/42 ,  G02B27/01 ,  G02F1/1334 ,  G02B5/32 ,  G02B6/124 ,  F21V8/00

Abstract: An optical waveguide comprises at least two TIR surface and contains a grating. Input TIR light with a first angular range along a first propagation direction undergoes at least two diffractions at the grating. Each diffraction directs light into a unique TIR angular range along a second propagation direction.

公开(公告)号：US11169314B2

公开(公告)日：2021-11-09

申请号：US16664665

申请日：2019-10-25

Applicant: DigiLens Inc.

Inventor： Milan Momcilo Popovich ,  Jonathan David Waldern ,  Alastair John Grant

IPC: G02B6/28 ,  G02B6/00 ,  F21V8/00 ,  G02B27/01 ,  G02F1/1334

Abstract: A waveguide apparatus has in combination: a light pipe with an optical axis for guiding light therethrough; a light coupling element in optical contact with an elongate portion of the reflecting surface of the light guide; and an optical waveguide in optical contact with the coupling element.

公开(公告)号：US11150408B2

公开(公告)日：2021-10-19

申请号：US16906872

申请日：2020-06-19

Applicant: DigiLens Inc.

Inventor： Jonathan David Waldern ,  Milan Momcilo Popovich ,  Alastair John Grant

IPC: G02B6/126 ,  G02B6/34 ,  G02B6/27 ,  G02B6/13 ,  G02B6/12 ,  G02B6/122

Abstract: Many embodiments in accordance with the invention are directed towards waveguides implementing birefringence control. In some embodiments, the waveguide includes a birefringent grating layer and a birefringence control layer. In further embodiments, the birefringence control layer is compact and efficient. Such structures can be utilized for various applications, including but not limited to: compensating for polarization related losses in holographic waveguides; providing three-dimensional LC director alignment in waveguides based on Bragg gratings; and spatially varying angular/spectral bandwidth for homogenizing the output from a waveguide. In some embodiments, a polarization-maintaining, wide-angle, and high-reflection waveguide cladding with polarization compensation is implemented for grating birefringence. In several embodiments, a thin polarization control layer is implemented for providing either quarter wave or half wave retardation.

公开(公告)号：US11106048B2

公开(公告)日：2021-08-31

申请号：US16888360

申请日：2020-05-29

Applicant: DigiLens Inc.

Inventor： Milan Momcilo Popovich ,  Jonathan David Waldern ,  Alastair John Grant

IPC: G02B27/48 ,  G02B5/32 ,  F21V8/00 ,  G02B27/42 ,  G02F1/29 ,  G02F1/313

Abstract: There is provided an illumination device comprising: a laser; a waveguide comprising at least first and second transparent lamina; a first grating device for coupling light from the laser into a TIR path in the waveguide; a second grating device for coupling light from the TIR path out of the waveguide; and a third grating device for applying a variation of at least one of beam deflection, phase retardation or polarization rotation across the wavefronts of the TIR light. The first second and third grating devices are each sandwiched by transparent lamina.

公开(公告)号：US20210231874A1

公开(公告)日：2021-07-29

申请号：US17113776

申请日：2020-12-07

Applicant: DigiLens Inc.

Inventor： Milan Momcilo Popovich ,  Jonathan David Waldern ,  Alastair John Grant

IPC: G02B6/27 ,  G02B27/01 ,  G02B27/00 ,  G02B6/34 ,  G02B27/28

Abstract: A waveguide apparatus, comprises: disposed in at least one layer: an input coupler; a first fold grating; a second fold grating; an output coupler; and a source of light optically coupled to the waveguide providing at least first and second polarizations of the light and at least one wavelength. The input coupler is configured to cause the first polarization light to travel along a first total internal reflection (TIR) path and the second polarization light to travel along a second TIR path.