# US 12,181,678 B2 · Eyepieces for augmented reality display system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,181,678 B2 - Document ID: US12181678B2 - Status: Granted - Kind: B2 - Application number: 18/296,803 - Filed: 2023-04-06 - Published: 2023-08-03 - Granted: 2024-12-31 - Earliest claimed: 2019-06-20 - Assignees: Magic Leap, Inc. - Applicants: Magic Leap, Inc. - Inventors: Kevin Messer; Michael Anthony Klug - Web page: https://patentgrep.com/patent/US12181678B2 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 5/1866: {Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence)} - G02B 6/0016: {Grooves, prisms, gratings, scattering particles or rough surfaces} - G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area} - G06F 3/011: {Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00)} - G06F 3/012: {Head tracking input arrangements} - G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)} - G06F 3/017: {Gesture based interaction, e.g. based on a set of recognized hand gestures (interaction based on gestures traced on a digitiser G06F3/04883)} - G02B 6/34: utilising prism or grating {(G02B6/293 takes precedence)} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An augmented reality display system. The system can include a first eyepiece waveguide with a first input coupling grating (ICG) region. The first ICG region can receive a set of input beams of light corresponding to an input image having a corresponding field of view (FOV), and can in-couple a first subset of the input beams. The first subset of input beams can correspond to a first sub-portion of the FOV. The system can also include a second eyepiece waveguide with a second ICG region. The second ICG region can receive and in-couple at least a second subset of the input beams. The second subset of the input beams can correspond to a second sub-portion of the FOV. The first and second sub-portions of the FOV can be at least partially different but together include the complete FOV of the input image. ## Claims ### Claim 1 An augmented reality display system comprising: a first eyepiece waveguide comprising a first optically transmissive substrate; a first input coupling grating (ICG) region formed on or in the first eyepiece waveguide, the first ICG region being configured to receive a set of input beams of light corresponding to an input image having a corresponding field of view, and to couple a first subset of the input beams into the first optically transmissive substrate as a first set of guided beams, the first subset of the input beams corresponding to a first sub-portion of the field of view of the input image; a second eyepiece waveguide comprising a second optically transmissive substrate; and a second input coupling grating (ICG) region formed on or in the second eyepiece waveguide, the second ICG region being configured to receive at least a second subset of the input beams of light corresponding to the input image, and to couple the second subset of input beams into the second optically transmissive substrate as a second set of guided beams, the second subset of the input beams corresponding to a second sub-portion of the field of view of the input image, wherein the first and second sub-portions of the field of view are at least partially different but together include the complete field of view of the input image. ### Claim 2 (depends on 1) The augmented reality display system of claim 1, wherein the field of view of the input image is larger in at least one dimension than a range of total internal reflection propagation angles in a thickness direction of the first and second eyepiece waveguides. ### Claim 3 (depends on 1) The augmented reality display system of claim 1, wherein: the first ICG region comprises periodic diffractive features with a first spatial period, the second ICG region comprises periodic diffractive features with a second spatial period, and the first spatial period is smaller than the second spatial period. ### Claim 4 (depends on 1) The augmented reality display system of claim 1, further comprising a projector system configured to project the set of input beams corresponding to the input image toward the first and second eyepiece waveguides, wherein the first eyepiece waveguide is located before the second eyepiece waveguide along the optical path of the set of input beams. ### Claim 5 (depends on 1) The augmented reality display system of claim 1, wherein the first and second sub-portions of the field of view partially overlap. ### Claim 6 (depends on 1) The augmented reality display system of claim 1, wherein the first and second ICG regions are laterally aligned. ### Claim 7 (depends on 1) The augmented reality display system of claim 1, wherein: the first and second ICG regions are configured to receive input beams of light corresponding to a plurality of color components of the input image, the first ICG region is configured to couple first subsets of the input beams for two or more of the color components into the first optically transmissive substrate as first sets of guided beams, the first subsets of the input beams corresponding to first sub-portions of the field of view of the color components of the input image, and the second ICG region is configured to couple second subsets of the input beams for two or more of the color components into the second optically transmissive substrate, the second subsets of the input beams corresponding to second sub-portions of the field of view of the color components of the input image. ### Claim 8 (depends on 7) The augmented reality display system of claim 7, wherein: the first ICG region comprises a plurality of spatially separated sub-sections, each corresponding to one of the color components, and the second ICG region comprises a plurality of spatially separated sub-sections, each corresponding to one of the color components. ### Claim 9 (depends on 7) The augmented reality display system of claim 7, further comprising an optical filter positioned along an optical path of the input beams, the optical filter being configured to selectively absorb input beams for the color component having the shortest wavelength. ### Claim 10 (depends on 9) The augmented reality display system of claim 9, wherein the optical filter is a yellow filter which absorbs at least 90% of blue light. ### Claim 11 (depends on 9) The augmented reality display system of claim 9, wherein the optical filter is configured to selectively absorb input beams for the two color components having the two shortest wavelengths. ### Claim 12 (depends on 11) The augmented reality display system of claim 11, wherein the optical filter is a red filter which absorbs at least 90% of green and blue light. ### Claim 13 (depends on 9) The augmented reality display system of claim 9, wherein the optical filter includes a dye. ### Claim 14 (depends on 1) The augmented reality display system of claim 1, wherein the first and second ICG regions have a first-order diffractive efficiency of 5-90%. ### Claim 15 (depends on 14) The augmented reality display system of claim 14, wherein the first ICG region is configured such that the second subset of input beams passes through without being diffracted. ### Claim 16 (depends on 1) The augmented reality display system of claim 1, wherein the first and second eyepiece waveguides have a refractive index of 1.5-2.1. ### Claim 17 (depends on 1) The augmented reality display system of claim 1, wherein at least one of the first optically transmissive substrate or the second optically transmissive substrate has a refractive index n, and wherein: for the refractive index n≤ 1.5, the field of view of the input image in at least one direction is greater than 29.0° but less than or equal to 44.5°, for the refractive index 1.5