# US 10,769,975 B1 · Scanned microLED array for waveguide display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,769,975 B1 - Document ID: US10769975B1 - Status: Granted - Kind: B1 - Application number: 16/685,046 - Filed: 2019-11-15 - Granted: 2020-09-08 - Earliest claimed: 2016-02-11 - Assignees: Facebook Technologies, LLC - Applicants: Facebook Technologies, LLC - Inventors: Wanli Chi; Pasi Saarikko; Hee Yoon Lee - Web page: https://patentgrep.com/patent/US10769975B1 ## CPC - G09G 3/025: {with scanning or deflecting the beams in two directions or dimensions} - G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)} - G02B 6/0016: {Grooves, prisms, gratings, scattering particles or rough surfaces} - G02B 6/0035: {provided on the surface of the light guide or in the bulk of it} - G02B 26/0833: {the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD (G02B26/0825 takes precedence; micromechanical devices in general B81B)} - 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 26/105: {with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence)} - G02B 27/0172: {characterised by optical features} - G02B 27/141: {using dichroic mirrors} - G02B 27/145: {having sequential partially reflecting surfaces} - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - G09G 3/3406: {Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336)} - G09G 3/346: {based on modulation of the reflection angle, e.g. micromirrors (micromirrors devices per se G02B26/0833)} - G02B 2027/0114: {comprising dichroic elements} - G02B 2027/0125: {Field-of-view increase by wavefront division} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A waveguide display includes a source assembly, an output waveguide, and a controller. The source assembly includes a light source and an optics system. The light source includes source elements arranged in a 1D or 2D array that emit image light. The optics system includes a scanning mirror assembly that scans the image light to particular locations based on scanning instructions. The output waveguide receives the scanned image light from the scanning mirror assembly and outputs an expanded image light. In some embodiments, the waveguide display includes a source waveguide and the 1D array of source elements. The source waveguide receives a conditioned image light from the source assembly. The controller generates the scanning instructions and provides the scanning instructions to the scanning mirror assembly. In some embodiments, the controller provides the scanning instructions to an actuator assembly of the source waveguide. ## Claims ### Claim 1 A scanning waveguide display, comprising: a source assembly including: a light source configured to emit image light, and at least one scanning mirror configured to scan the image light along two dimensions to generate scanned image light; and an output waveguide assembly including an input area and an output area, the output waveguide assembly configured to receive the scanned image light at the input area and to output a version of the scanned image light from at least a portion of the output area along the two dimensions. ### Claim 2 (depends on 1) The scanning waveguide display of claim 1, wherein the output waveguide assembly is configured to condition the scanned image light. ### Claim 3 (depends on 1) The scanning waveguide display of claim 1, wherein the at least one scanning mirror is configured to adjust an orientation of the emitted image light to generate the scanned image light. ### Claim 4 (depends on 1) The scanning waveguide display of claim 1, further comprising a controller configured to generate scanning instructions causing the at least one scanning mirror to scan the image light along the two dimensions. ### Claim 5 (depends on 1) The scanning waveguide display of claim 1, wherein the at least one scanning mirror includes a first mirror configured to scan along a first of the two dimensions and a second mirror configured to scan along a second of the two dimensions, the first dimension and the second dimension orthogonal to each other. ### Claim 6 (depends on 1) The scanning waveguide display of claim 1, wherein the at least one scanning mirror comprises a galvanometer mirror or a MEMS mirror. ### Claim 7 (depends on 1) The scanning waveguide display of claim 1, wherein the light source comprises a plurality of source elements configured to emit the image light, the source elements positioned in a one-dimensional array, each of the source elements configured to emit a portion of the image light representing a line of a two-dimensional image. ### Claim 8 (depends on 7) The scanning waveguide display of claim 7, wherein the one-dimensional array is curved. ### Claim 9 (depends on 1) The scanning waveguide display of claim 1, wherein the light source comprises a plurality of source elements configured to emit the image light, the source elements positioned in a two-dimensional array, each of the source elements configured to emit a portion of the image light representing a portion of a two-dimensional image. ### Claim 10 (depends on 1) The scanning waveguide display of claim 1, wherein the light source comprises a first source element configured to emit a first portion of the image light having a wavelength in a first wavelength range and a second source element configured to emit a second portion of the image light having a wavelength in a second wavelength range different from the first wavelength range. ### Claim 11 (depends on 1) The scanning waveguide display of claim 1, wherein the light source comprises a plurality of source elements configured to emit the image light, each of the source elements emitting a portion of the imaging light having a same wavelength. ### Claim 12 (depends on 1) The scanning waveguide display of claim 1, wherein the image light is at least partially coherent. ### Claim 13 (depends on 1) The scanning waveguide display of claim 1, wherein the light source comprises a plurality of source elements, each of the source elements selected from a group consisting of: a light-emitting diode (LED), a MicroLED, an organic light-emitting diode (OLED), an organic MicroLED, and a superluminescent light emitting diode (SLED). ### Claim 14 (depends on 1) The scanning waveguide display of claim 1, wherein the light source includes a plurality of source elements, each of the source elements having a plurality of sides, at least two of the sides are in contact with an optical isolator configured to reduce optical interference. ### Claim 15 (depends on 14) The scanning waveguide display of claim 14, wherein the optical isolator is in contact with at least three sides of the plurality of sides. ### Claim 16 A scanning waveguide display comprising: a light source configured to emit image light; a source waveguide assembly including an entrance area and an exit area, the source waveguide assembly configured to receive the image light at the entrance area, expand the image light in at least one dimension, and output the expanded image light from the exit area; and an output waveguide assembly including an input area and an output area, the output waveguide assembly configured to receive the expanded image light at the input area, and to output a version of the expanded image light from at least a portion of the output area along two dimensions. ### Claim 17 (depends on 16) The scanning waveguide display of claim 16, wherein the source waveguide assembly is configured to rotate along the at least one dimension. ### Claim 18 (depends on 16) The scanning waveguide display of claim 16, wherein the source waveguide assembly comprises an actuator configured to cause the source waveguide assembly to rotate. ### Claim 19 (depends on 18) The scanning waveguide display of claim 18, further comprising a controller configured to generate scanning instructions causing the actuator to rotate at a defined frequency. ### Claim 20 (depends on 16) The scanning waveguide display of claim 16, wherein the light source includes a light source element configured to emit the image light at least partially coherent and a condition element configured to condition the image light.