# US 12,181,672 B2 · Eyelens waveguide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,181,672 B2 - Document ID: US12181672B2 - Status: Granted - Kind: B2 - Application number: 17/352,140 - Filed: 2021-06-18 - Published: 2021-10-07 - Granted: 2024-12-31 - Earliest claimed: 2018-03-06 - Assignees: Snap Inc. - Applicants: Snap Inc. - Inventors: Jun Lin; Zhibin Zhang - Web page: https://patentgrep.com/patent/US12181672B2 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 6/0016: {Grooves, prisms, gratings, scattering particles or rough surfaces} - G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B 27/0176: {characterised by mechanical features} - G02B 2027/0125: {Field-of-view increase by wavefront division} - G02B 2027/0138: {comprising image capture systems, e.g. camera} - G02B 2027/0154: {with movable elements} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Various waveguides and image display systems are disclosed herein. In an example, an image display system can include an optical engine configured to generate an image and a waveguide. The waveguide can have a light in-coupling region formed along a peripheral edge of the waveguide, the light in-coupling region including a first surface with a first set of diffraction gratings, and a light exit region formed along a top surface of the waveguide, the light exit region including a second set of diffraction gratings. The first set of diffraction gratings can be configured to diffract light towards the second set of diffraction gratings, and the second set of diffraction gratings can be configured to diffract light towards the user's eye. ## Claims ### Claim 1 A waveguide for a display system comprising: a waveguide body configured to guide light through the waveguide body, the waveguide body comprising a pair of opposite major outer faces, and a peripheral edge face connecting the major outer faces; a light in-coupling region formed on the peripheral edge face of the waveguide body, the light in-coupling region including a first surface having a first set of diffraction gratings and a second surface having a second set of diffraction gratings, the first and second surfaces being angled relative to each other and wherein the light in-coupling region, including the first and second sets of diffraction gratings, extends along an entirety of the peripheral edge face of the waveguide body; and a light exit region formed along a top surface of the waveguide body, the light exit region including a third set of diffraction gratings, wherein the first set of diffraction gratings are configured to diffract light towards the second set of diffraction gratings, the second set of diffraction gratings are configured to diffract light towards the third set of diffraction gratings, and the third set of diffraction gratings are configured to diffract light towards an eye of a user. ### Claim 2 (depends on 1) The waveguide of claim 1, wherein the light exit region, including the third set of diffraction gratings, are formed along a majority of the top surface of the waveguide body. ### Claim 3 (depends on 1) The waveguide of claim 1, wherein the light exit region, including the third set of diffraction gratings, forms a continuous ring on the top surface of the waveguide body. ### Claim 4 (depends on 1) The waveguide of claim 1, wherein the peripheral edge face of the waveguide body is substantially V-shaped. ### Claim 5 (depends on 1) The waveguide of claim 1, comprising a plurality of fiber launches located at respective positions on the peripheral edge face of the waveguide to emit light into the waveguide. ### Claim 6 (depends on 1) The waveguide of claim 1, comprising a plurality of surface area diffraction gratings. ### Claim 7 (depends on 6) The waveguide of claim 6, wherein individual surface area diffraction gratings of the plurality of surface area diffraction gratings are distinct and separate from each of the other individual surface area diffraction gratings of the plurality of surface area diffraction gratings. ### Claim 8 An image display system comprising: an optical engine configured to generate an image; and a waveguide comprising: front and rear surfaces, the waveguide arranged and configured to guide light from the optical engine through the waveguide by reflection at the front and rear surfaces to guide the light onto an eye of a user and project the image to the user; a pair of opposite major outer faces, and a peripheral edge face connecting the major outer faces; a light in-coupling region formed along an entirety of the peripheral edge face, the light in-coupling region including a first surface with a first set of diffraction gratings; and a light exit region formed along a top surface of the waveguide, the light exit region including a second set of diffraction gratings, wherein the first set of diffraction gratings are configured to diffract light towards the second set of diffraction gratings, and the second set of diffraction gratings are configured to diffract light towards an eye of the user. ### Claim 9 (depends on 8) The image display system of claim 8, wherein the light in-coupling region further comprises a second surface with a third set of diffraction gratings, wherein the first surface is angled relative to the second surface. ### Claim 10 (depends on 8) The image display system of claim 8, wherein the light exit region, including the second set of diffraction gratings, are formed along a majority of the top surface of the waveguide. ### Claim 11 (depends on 8) The image display system of claim 8, comprising a frame including a waveguide rim, the waveguide rim including an inner edge that directly receives the edge of the waveguide and fixedly retains the waveguide within the frame. ### Claim 12 (depends on 11) The image display system of claim 11, wherein the inner edge of the frame comprises an angled slot configured to receive the peripheral edge face of the waveguide. ### Claim 13 (depends on 11) The image display system of claim 11, comprising at least a first light-transmission region in the waveguide rim for receiving the image from the optical engine and allowing the image to enter the waveguide through the light in-coupling region. ### Claim 14 (depends on 8) The image display system of claim 8, comprising: a frame including: first end piece defining a first lateral end portion of the frame; a second end piece defining a second lateral end portion of the frame; a first temple having a first front portion coupled to the first end piece and a first rear portion configured to engage a first ear of the user; a second temple having a second front portion coupled to the second end piece and a second rear portion configured to engage a second ear of the user. ### Claim 15 (depends on 14) The image display system of claim 14, wherein the optical engine is disposed within at least one of the first end piece or the second end piece. ### Claim 16 A waveguide for a display system comprising: a waveguide body configured to guide light through the waveguide body, the waveguide body comprising a pair of opposite major outer faces, and an angled peripheral edge face connecting the major outer faces, the angled peripheral edge face including a first surface and a second surface that intersect at an angle relative to each other; a light in-coupling region formed on the peripheral edge face of the waveguide body, the light in-coupling region including a first set of diffraction gratings disposed on the first surface of the angled peripheral edge face and a second set of diffraction gratings disposed on the second surface of the angled peripheral edge face; and a light exit region formed along a top surface of the waveguide body, the light exit region including a third set of diffraction gratings that is formed along a majority of the top surface of the waveguide body, wherein the first set of diffraction gratings are configured to diffract light towards the second set of diffraction gratings, the second set of diffraction gratings are configured to diffract light towards the third set of diffraction gratings, and the third set of diffraction gratings are configured to diffract light towards an eye of a user. ### Claim 17 (depends on 16) The waveguide of claim 16, wherein the light exit region, including the third set of diffraction gratings, are formed along a majority of the top surface of the waveguide body. ### Claim 18 (depends on 16) The waveguide of claim 16, comprising: a plurality of fiber launches located at respective positions on the angled peripheral edge face of the waveguide to emit light into the waveguide; and a plurality of surface area diffraction gratings. ### Claim 19 (depends on 18) The waveguide of claim 18, wherein at least one fiber launch of the plurality of fiber launches projects light toward at least one surface area grating of the plurality of surface area diffraction gratings to project an image to the user. ### Claim 20 (depends on 18) The waveguide of claim 18, wherein a first fiber launch of the plurality of fiber launches projects light to a first surface area diffraction grating of the plurality of surface area diffraction gratings at a first time that is different from a second time that a second fiber launch of the plurality of fiber launches projects light to a second surface area diffraction grating of the plurality of surface area diffraction gratings.