# US 2017/0255016 A1 · Reflective switching device for inputting different wavelengths of light into waveguides > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0255016 A1 - Document ID: US20170255016A1 - Status: Published application - Kind: A1 - Application number: 15/445,827 - Filed: 2017-02-28 - Published: 2017-09-07 - Earliest claimed: 2016-03-01 - Assignees: Magic Leap, Inc. - Applicants: Magic Leap, Inc. - Inventors: David Tinch; William K. Jones - Web page: https://patentgrep.com/patent/US20170255016A1 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 6/3518: {the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device (MEMS devices in general B81B; manufacture of MEM devices in general B81C; micromechanical devices controlling the direction of light G02B26/0833)} - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area} - 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 2027/0112: {comprising device for genereting colour display} - G02B 2027/0125: {Field-of-view increase by wavefront division} - G02B 2027/0127: {comprising devices increasing the depth of field} - G02B 2027/0185: {Displaying image at variable distance} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Systems and methods are provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides. The systems and methods provided for selectively incoupling light having different wavelengths into one of a plurality of waveguides comprise a switching device comprising switchable reflective elements that can be configured to redirect incoming light towards an incoupling element associated with one of a plurality of waveguides. ## Claims ### Claim 1 A wearable head mounted display system configured to be used by a wearer having an eye, said wearable head mounted display system comprising: an optical projector configured to output light to form an image; a plurality of waveguides for receiving said light to direct said light into the eye of a wearer; a frame configured to dispose the waveguides in front of said eye; and a switching device comprising a plurality of microelectromechanical systems (MEMS) mirrors disposed so as to selectively couple light into different waveguides in said plurality of waveguides. ### Claim 2 (depends on 1) The head mounted display system of claim 1, wherein the optical projector selectively outputs different color light. ### Claim 3 (depends on 1) The head mounted display system of claim 1, further comprising a plurality of incoupling optical elements disposed with respect to said MEMS mirrors to receive light from said projector reflected off said MEMS mirrors and to couple said light received by said incoupling optical element into one of said waveguides associated with said incoupling optical element such that said light propagates along said waveguide by total internal reflection. ### Claim 4 (depends on 3) The head mounted display system of claim 3, further comprising a plurality of outcoupling optical elements associated with the plurality of waveguides, the plurality of outcoupling optical elements being configured to redirect light from the plurality of waveguides out of the said plurality of waveguides. ### Claim 5 (depends on 1) The head mounted display system of claim 1, wherein a number of the plurality of MEMS mirrors is equal to a number of the plurality of waveguides. ### Claim 6 (depends on 1) The head mounted display system of claim 1, wherein a number of the plurality of MEMS mirrors is less than a number of the plurality of waveguides. ### Claim 7 (depends on 1) The head mounted display system of claim 1, wherein the plurality of MEMS mirrors are configured to flip out of a plane of a surface parallel to a surface of the plurality of waveguides by an angle θ having a value between about 30 degrees and about 60 degrees. ### Claim 8 (depends on 1) The head mounted display system of claim 1, wherein the plurality of MEMS mirrors are configured to slide in and out of a light path of the output light. ### Claim 9 A display device comprising: a waveguide; an incoupling optical element configured to redirect a light beam at a first wavelength from an optical source into the waveguide; a microelectromechanical systems (MEMS) mirror; and a controller configured to actuate the MEMS mirror such that the MEMS mirror is disposed in an optical path of the light beam and redirect the light beam towards the incoupling optical element. ### Claim 10 (depends on 9) The display device of claim 9, further comprising: a second waveguide; a second incoupling optical element to redirect a second light beam at a second wavelength from the optical source into the second waveguide; and a second microelectromechanical systems (MEMS) mirror, wherein the controller is configured to actuate the second MEMS mirror such that the second MEMS mirror is disposed in an optical path of the second light beam and redirect the second light beam towards the second incoupling optical element. ### Claim 11 (depends on 10) The display device of claim 10, further comprising: a third waveguide; a third incoupling optical element to redirect a third light beam at a third wavelength from the optical source into the third waveguide; and a third microelectromechanical systems (MEMS) mirror, wherein the controller is configured to actuate the third MEMS mirror such that the third MEMS mirror is disposed in an optical path of the third light beam and redirect the third light beam towards the third incoupling optical element. ### Claim 12 (depends on 11) The display device of claim 11, wherein the first waveguide, the second waveguide and the third waveguide are associated with a first depth plane, and wherein light from the first, second and third waveguides are configured to produce an image appearing to originate from the first depth plane. ### Claim 13 (depends on 12) The display device of claim 12, further comprising: a fourth waveguide associated with a second depth plane different from the first depth plane; a fourth incoupling optical element associated with the fourth waveguide and configured to redirect light from the optical source at one of the first, second or third wavelengths into the fourth waveguide; and a fourth microelectromechanical systems (MEMS) mirror disposed over the fourth incoupling optical element, wherein the controller is configured to actuate the fourth MEMS mirror such that the fourth MEMS mirror is disposed in an optical path of the light from the optical source towards the fourth incoupling optical element. ### Claim 14 (depends on 12) The display device of claim 12, wherein the first waveguide, the second waveguide and the third waveguide comprise outcoupling optical elements configured to output light from the first waveguide, the second waveguide and the third waveguide. ### Claim 15 A display device comprising: a first plurality of waveguides associated with a first depth plane, the plurality of waveguides configured to produce an image appearing to originate from the first depth plane; a first plurality of incoupling optical elements associated with the first plurality of waveguides, the plurality of incoupling optical elements configured to redirect light from an optical source into the plurality of waveguides; a microelectromechanical systems (MEMS) mirror; and a controller configured to actuate the MEMS mirror such that the MEMS mirror is disposed in an optical path of the light from the optical source and redirect said light towards the first plurality of incoupling optical elements. ### Claim 16 (depends on 15) The display device of claim 15, further comprising: a second plurality of waveguides associated with a second depth plane, the second plurality of waveguides configured to produce an image appearing to originate from the second depth plane; a second plurality of incoupling optical elements associated with the second plurality of waveguides, the second plurality of incoupling optical elements configured to redirect light from the optical source into the second plurality of waveguides; and a second microelectromechanical systems (MEMS) mirror, wherein the controller is configured to actuate the second MEMS mirror such that the second MEMS mirror is disposed in an optical path of the light from the optical source and redirect said light towards the second plurality of incoupling optical elements.