# US 11,445,155 B1 · Display system with angularly separated lasers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,155 B1 - Document ID: US11445155B1 - Status: Granted - Kind: B1 - Application number: 17/208,810 - Filed: 2021-03-22 - Published: 2022-09-22 - Granted: 2022-09-13 - Earliest claimed: 2021-03-22 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Daniel Adema; Ian Andrews - Web page: https://patentgrep.com/patent/US11445155B1 ## CPC - H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)} - H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)} - G02B 17/008: {Systems specially adapted to form image relays or chained systems} - G02B 26/105: {with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence)} - G02B 27/0172: {characterised by optical features} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - H04N 9/3164: {using multiple light sources} - H04N 9/3173: {wherein the projection device is specially adapted for enhanced portability} - G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)} - G02B 27/104: {for use with scanning systems (scanning systems G02B26/10)} - G02B 2027/0125: {Field-of-view increase by wavefront division} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Display systems, such as near eye display systems or wearable heads up displays, may include a laser projection system having an optical engine and an optical scanner. Light output by the optical engine may be directed into the optical scanner as two angularly separated laser light beams. The angularly separated laser light beams may overlap at an entrance pupil plane along a first dimension at a first scan mirror of the optical scanner, or at a location between the first scan mirror and an optical relay of the optical scanner. The angularly separated laser light beams may overlap at an exit pupil plane along the first dimension at a second scan mirror of the optical scanner or at an incoupler of the laser projection system. ## Claims ### Claim 1 A laser projection system comprising: an optical relay configured to receive and relay a first laser light beam and a second laser light beam, wherein the first laser light beam and the second laser light beam are to be angularly separated when the first laser light beam and the second laser light beam are scanned into the optical relay; a first scan mirror configured to scan at least one of the first laser light beam and the second laser light beam into the optical relay; and a second scan mirror configured to receive the first laser light beam and the second laser light beam from the optical relay and to scan the first laser light beam and the second laser light beam, wherein the first laser light beam and the second laser light beam are to converge along a first dimension to overlap at the second scan mirror. ### Claim 2 (depends on 1) The laser projection system of claim 1, wherein the first laser light beam and the second laser light beam are to converge along the first dimension to overlap at the first scan mirror. ### Claim 3 (depends on 1) The laser projection system of claim 1, wherein the first laser light beam and the second laser light beam are to converge along the first dimension to overlap at a location between the first scan mirror and the optical relay. ### Claim 4 (depends on 1) The laser projection system of claim 1, further comprising: an optical engine comprising a plurality of light sources, each configured to output a respectively different wavelength of laser light; and a beam combiner configured to receive the wavelengths of laser light from the optical engine and to combine the wavelengths of laser light to produce the first laser light beam and the second laser light beam, such that the first laser light beam and the second laser light beam are to be angularly separated with respect to one another and are to be directed toward the first scan mirror. ### Claim 5 (depends on 1) The laser projection system of claim 1, further comprising: a waveguide comprising an incoupler; wherein the first scan mirror is configured to scan the first laser light beam and the second laser light beam along a first scanning dimension that is substantially orthogonal to the first dimension; wherein the second scan mirror is configured to scan the first laser light beam and the second laser light beam along a second scanning dimension that is different from the first scanning dimension; wherein a region at which the first laser light beam and the second laser light beam are to overlap at the second scan mirror corresponds to a first exit pupil plane of the optical relay; and wherein the optical relay is configured to cause respective scan regions of the first laser light beam and the second laser light beam to converge to respective and substantially one-dimensional paths that correspond to a second exit pupil plane of the optical relay and that are each disposed at the incoupler. ### Claim 6 (depends on 1) The laser projection system of claim 1, wherein the optical relay is configured to reshape cross-sections of each of the first laser light beam and the second laser light beam by magnifying each of the first laser light beam and the second laser light beam in at least one of a first direction and a second direction, wherein the first direction is substantially orthogonal to the second direction. ### Claim 7 (depends on 1) A near-eye display comprising the laser projection system of claim 1, and further comprising: an eyeglasses frame that surrounds at least a portion of the laser projection system; and an eyeglasses lens, wherein the laser projection system is configured to output the first laser light beam and the second laser light beam through at least a portion of the eyeglasses lens. ### Claim 8 A near-eye display comprising: laser projection system comprising: a first scan mirror configured to scan angularly separated laser light beams along a first scanning dimension; an optical relay configured to receive the angularly separated laser light beams from the first scan mirror and to relay the angularly separated laser light beams, wherein the angularly separated laser light beams are to be angularly separated in the optical relay; and a second scan mirror configured to scan the angularly separated laser light beams, along a second scanning dimension, wherein the angularly separated laser light beams are to converge along a first dimension to a first exit pupil plane located at the second scan mirror. ### Claim 9 (depends on 8) The near-eye display of claim 8, wherein the angularly separated laser light beams are to converge along the first dimension to a first entrance pupil plane located at the first scan mirror. ### Claim 10 (depends on 8) The near-eye display of claim 8, wherein the angularly separated laser light beams are to converge along the first dimension to a first entrance pupil plane located between the first scan mirror and the optical relay. ### Claim 11 (depends on 8) The near-eye display of claim 8, further comprising: an optical engine comprising a plurality of light sources, each configured to output a respectively different wavelength of laser light; and a beam combiner configured to receive the wavelengths of laser light from the optical engine and to combine the wavelengths of laser light to produce angularly separated laser light beams, such that the angularly separated laser light beams are to be directed toward the first scan mirror. ### Claim 12 (depends on 8) The near-eye display of claim 8, further comprising: a waveguide comprising an incoupler; wherein the first scanning dimension is substantially orthogonal to the first dimension; wherein the second scanning dimension is different from the first scanning dimension; and wherein the optical relay is configured to cause respective scan regions of the angularly separated laser light beams to converge to respective and substantially one-dimensional paths that correspond to a second exit pupil plane of the optical relay and that are each disposed at the incoupler. ### Claim 13 (depends on 8) The near-eye display of claim 8, wherein the optical relay is configured to reshape cross-sections of each of the angularly separated laser light beams by magnifying each of the angularly separated laser light beams in at least one of a first direction and a second direction, wherein the first direction is substantially orthogonal to the second direction. ### Claim 14 (depends on 8) The near-eye display of claim 8, and further comprising: an eyeglasses frame that surrounds at least a portion of the laser projection system; and an eyeglasses lens, wherein the laser projection system is configured to output the angularly separated laser light beams through at least a portion of the eyeglasses lens. ### Claim 15 A method comprising: scanning, with a first scan mirror, angularly separated laser light beams along a first scanning dimension; receiving, with an optical relay from the first scan mirror, the angularly separated laser light beams from the first scan mirror; relaying, with the optical relay, the angularly separated laser light beams such that the angularly separated laser light beams converge along a first dimension to a first exit pupil plane; and scanning, with a second scan mirror, the angularly separated laser light beams, relayed by the optical relay, along a second scanning dimension, wherein the first exit pupil plane is located at the second scan mirror. ### Claim 16 (depends on 15) The method of claim 15, further comprising: generating, with a plurality of light sources of an optical engine, wavelengths of laser light; and combining, with a beam combiner, the wavelengths of laser light generated by the optical engine to produce the angularly separated laser light beams. ### Claim 17 (depends on 16) The method of claim 16, wherein combining the wavelengths of laser light comprises: combining, with the beam combiner, the wavelengths of laser light generated by the optical engine to produce the angularly separated laser light beams, such that the angularly separated laser light beams converge to a first entrance pupil plane located at the first scan mirror. ### Claim 18 (depends on 16) The method of claim 16, wherein combining the wavelengths of laser light comprises: combining, with the beam combiner, the wavelengths of laser light generated by the optical engine to produce the angularly separated laser light beams, such that the angularly separated laser light beams converge to a first entrance pupil plane located between the first scan mirror and the optical relay. ### Claim 19 (depends on 15) The method of claim 15, wherein the first scanning dimension that is substantially orthogonal to the first dimension, and the second scanning dimension is different from the first scanning dimension, the method further comprising: causing, with the optical relay, respective scan regions of the angularly separated laser light beams to converge to respective and substantially one-dimensional paths that correspond to a second exit pupil plane of the optical relay and that are each disposed at an incoupler of a waveguide. ### Claim 20 (depends on 15) The method of claim 15, further comprising: reshaping, with the optical relay, cross-sections of each of the angularly separated laser light beams by: magnifying each of the angularly separated laser light beams in at least one of a first direction and a second direction, wherein the first direction is substantially orthogonal to the second direction. ### Claim 21 (depends on 15) The method of claim 15, further comprising: outputting the angularly separated laser light beams through at least a portion of an eyeglasses lens.