# US 11,994,687 B2 · Meta-optics for virtual reality and augmented reality systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,687 B2 - Document ID: US11994687B2 - Status: Granted - Kind: B2 - Application number: 17/308,905 - Filed: 2021-05-05 - Published: 2021-11-18 - Granted: 2024-05-28 - Earliest claimed: 2020-05-13 - Assignees: President and Fellows of Harvard College; Trustees of Boston University - Applicants: President and Fellows of Harvard College; Trustees of Boston University - Inventors: Zhaoyi Li; Yao-Wei Huang; Peng Lin; Ji-Xin Cheng; Federico Capasso - Web page: https://patentgrep.com/patent/US11994687B2 ## CPC - G02B 1/002: {made of materials engineered to provide properties not available in nature, e.g. metamaterials} - G02B 27/141: {using dichroic mirrors} - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G02B 27/4211: {correcting chromatic aberrations (G02B27/0056, G02B27/4222, G02B27/4227 take precedence)} - G02B 27/4216: {correcting geometrical aberrations} - G02B 27/4227: {in image scanning systems} - G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)} - G02B 2027/011: {comprising device for correcting geometrical aberrations, distortion} - G02B 2027/0116: {comprising devices for correcting chromatic aberration} - G02B 2207/101: Nanooptics - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A display system includes an optical device configured according to constructive interference for a plurality of wavelengths at a focal length. The display system includes a fiber. The display system includes a controller configured to scan the fiber using a Lissajous scanning method to generate a display. The display can be disposed within a focal plane of the optical device. The controller is configured to modulate light intensity from the fiber. The controller can be configured to form a display image that passes through the optical device. The display system can include an optical combiner configured to reflect the display image from the optical device and form a virtual image. The optical device can be configured to magnify a display image from the display and form a virtual image. ## Claims ### Claim 1 A display system, comprising: an optical device configured according to constructive interference for a plurality of wavelengths at a focal length; a fiber; and a controller configured to: scan the fiber using a Lissajous scanning method to generate a display, the display disposed within a focal plane of the optical device; and modulate light intensity from the fiber; wherein the optical device is configured to magnify a display image from the display and form a virtual image. ### Claim 2 (depends on 1) The display system of claim 1, wherein the virtual image is located outside of the focal plane of the optical device. ### Claim 3 (depends on 1) The display system of claim 1, wherein the optical device is configured according to constructive interference for at least three wavelengths. ### Claim 4 (depends on 1) The display system of claim 1, wherein the controller is configured to modulate incident light intensity at one end of the fiber using an acousto-optic modulator or an electro-optic modulator. ### Claim 5 (depends on 1) The display system of claim 1, wherein the controller is configured to modulate light intensity by transitioning between two levels of voltages or multi-levels of voltages. ### Claim 6 (depends on 1) The display system of claim 1, further comprising: a piezo actuator tube; and a pair of electrodes connected to the piezo actuator tube; wherein the fiber is disposed within the piezo actuator tube; and wherein the controller is configured to apply a voltage to the pair of electrodes to configure a position of at least one end of the fiber. ### Claim 7 (depends on 1) The display system of claim 1, wherein the controller is configured to apply a voltage to a first pair of electrodes of the form: Vx(t)=Ax(t)sin(2πfxt+ϕx) and apply a voltage to a second pair of electrodes of the form: Vy(t)=Ay(t)sin(2πfyt+ϕy) where Ax is a voltage amplitude in an x-direction, Ay is a voltage amplitude in a y-direction, fx is an x-direction modulation frequency, fy is an y-direction modulation frequency, ϕx is a x-direction initial phase, and ϕy is a y-direction initial phase. ### Claim 8 (depends on 7) The display system of claim 7, wherein Ax and Ay are constants, the x-direction modulation frequency and the y-direction modulation frequency are different, and the x-direction initial phase and the y-direction initial phase are equal. ### Claim 9 (depends on 1) The display system of claim 1, wherein the fiber is coupled to at least 3 different laser sources. ### Claim 10 (depends on 1) The display system of claim 1, wherein the optical device comprises: a first zone comprising a first plurality of nanoscale elements, wherein the first plurality of nanoscale elements has a first optical dispersion profile and a first orientation; and a second zone comprising a second plurality of nanoscale elements, wherein the second plurality of nanoscale elements has a second optical dispersion profile and a second orientation; wherein the first orientation and the second orientation are configured according to constructive interference for the plurality of wavelengths and the focal length. ### Claim 11 A display system, comprising: an optical device configured according to constructive interference for a plurality of wavelengths and a focal length; a fiber; a controller configured to: scan an end of the fiber using a Lissajous scanning method to generate a display; modulate light intensity from the fiber; and form a display image that passes through the optical device; an optical combiner configured to reflect the display image from the optical device and form a virtual image. ### Claim 12 (depends on 11) The display system of claim 11, the optical combiner configured to allow a real-world image to pass through the optical combiner. ### Claim 13 (depends on 11) The display system of claim 11, wherein the optical device is configured according to constructive interference for at least three wavelengths. ### Claim 14 (depends on 11) The display system of claim 11, wherein the controller is configured to modulate incident light intensity at one end of the fiber using an acousto-optic modulator or an electro-optic modulator. ### Claim 15 (depends on 11) The display system of claim 11, wherein the controller is configured to modulate light intensity by transitioning between two levels of voltages or multi-levels of voltages. ### Claim 16 (depends on 11) The display system of claim 11, further comprising: a piezo actuator tube; and a pair of electrodes connected to the piezo actuator tube; wherein the fiber is disposed within the piezo actuator tube; and wherein the controller is configured to apply a voltage to the pair of electrodes to configure a position of at least one end of the fiber. ### Claim 17 (depends on 11) The display system of claim 11, wherein the controller is configured to apply a voltage to a first pair of electrodes of the form: Vx(t)=Ax(t)sin(2πfxt+ϕx) and apply a voltage to a second pair of electrodes of the form: Vy(t)=Ay(t)sin(2πfyt+ϕy) where Ax is a voltage amplitude in an x-direction, Ay is a voltage amplitude in a y-direction, fx is an x-direction modulation frequency, fy is an y-direction modulation frequency, ϕx is a x-direction initial phase, and ϕy is a y-direction initial phase. ### Claim 18 (depends on 17) The display system of claim 17, wherein Ax and Ay are constants, the x-direction modulation frequency and the y-direction modulation frequency are different (fx≠fy), and the x-direction initial phase and the y-direction initial phase are equal (ϕx=ϕy). ### Claim 19 (depends on 11) The display system of claim 11, wherein the fiber is coupled to at least 3 different laser sources. ### Claim 20 (depends on 11) The display system of claim 11, wherein the optical device comprises: a first zone comprising a first plurality of nanoscale elements, wherein the first plurality of nanoscale elements has a first optical dispersion profile and a first orientation; and a second zone comprising a second plurality of nanoscale elements, wherein the second plurality of nanoscale elements has a second optical dispersion profile and a second orientation; wherein the first orientation and the second orientation are configured according to constructive interference for the plurality of wavelengths and the focal length.