diffractive waveguide

Download Download PDF. Since theres no turn grating, the output grating can take up more real estate to potentially increase the eye box size. As showcased in Figure 3 , light coupled into the waveguide through input grating (zone 1) directly goes into zone 3, where the 2D grating pillars can simultaneously expand the pupil into X and Y directions while releasing the light bit by bit to the viewers eyes. Additionally, this role might be eligible for discretionary bonuses or commission payments as well as relocation. The waveguide according to any of the preceding claims, wherein the diffractive optical response of the intermediate regions (26A) changes continuously for a plurality of angles of incidence and/or wavelengths. 4. The waveguide according to any of the preceding claims, wherein the diffractive optical element (22A) consists of a microstructure defining the diffractive optical response thereof, the microstructure being free from graded height profiles taking the local height of the microstructure to zero or close to zero, or, alternatively, take the height to the height of a neighboring diffractive optical element contained by the waveguide element. Best place to learn about AR& VR. This reduces the color non-uniformity across the eye box. In some embodiments, at each location of the diffractive optical element, the optical response of the diffractive optical element is unique with respect to other locations thereof. In this way, its equivalent to the conventional optical elements in terms of changing the propagation direction of light. 1, in some embodiments, at each location of the diffractive optical element, the diffractive optical response is non-zero. All three companies will . espoo, finland and shanghai, june 3, 2022 /prnewswire/ -- dispelix (espoo) - a pioneer in the design and manufacturing of next-generation diffractive waveguides - today announced it has been in a long-term partnership with respected ar light engine supplier jade bird displays (jbd) to develop a family of new reference designs for augmented Laser beam scanning (LBS) based image sources are attractive candidates to minimize the projector volume without sacrificing the field of view. Our structured development philosophy, coupled with our engineering expertise, ensures manufacturable solutions. For more information, visit JBD's website, Linkedin or Twitter pages. Examples of DOEs commonly used in conventional personal display devices are in-coupling gratings, exit pupil expander gratings and out-coupling gratings. Here we need to use either UV light or other methods to solidify the printed resin before lifting up the master stamp, leaving us the final diffraction gratings on the waveguide surface. Light from the optical engine includes RGB colors, with each color spanning a range of wavelengths as well. Disclosed is an improved diffraction structure for 3D display systems. There are many more companies working on the individual volumetric grating design and fabrication though. from 8 AM - 9 PM ET. Once designed for example using the principles discussed herein, the diffractive optical element can be manufactured using optical microfabrication techniques known per se. diffraction intensity to a specific angle for a fixed incident angle and z 25 wavelength. The working mechanism is relatively straightforward, but they tend to be bulky with quite tedious manufacturing procedure. This is similar to the 1D EPE in the X direction shown in Figure 3 (a). S 1 25 selecting a first diffractive pattern providing the first optical response, x selecting at least one second diffractive pattern providing the at least one second S optical response, 3 selecting a plurality of other diffractive patterns providing said further optical = responses, wherein the geometric properties of the other patterns are spatially continuously changing along the waveguide from the first region to the at least one second region. The concept of using three grating areas for two-dimensional exit pupil expansion (2D EPE) was proposed over ten years ago by Dr. Tapani Levola from then Nokia Research Lab, who contributed lots of valuable publications which mainly demonstrated with SRG. Every Apple employee also has the opportunity to become an Apple . distorsion, aberration, Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. Sep 5, 2019 - DigiLens Inc. A projection display device comprising a light source and an SBG device having a multiplicity of separate SBG elements sandwiched between transparent substrates to which transparent electrodes have been applied. Diffractive waveguides are the most commonly utilized waveguide structure for AR displays. This is so since the = beams corresponding to the FOV angles will be subdivided by the sub-region boundaries LO to such an extent that their parts become highly divergent and the diffraction into o r 25 unwanted propagation directions as associated with the subdivisions, and which leads to a - FOV angle cross-talk, becomes significant. Jul 13, 2022 (The Expresswire) -- "Diffractive Waveguide Market" provides leading manufacturers analysis, size, share, future trends, and sales margin are. Dispelix LED combined with AmLEDmeans that ideal visual fidelity is both achieved and consistently maintained for an exceptional, undistorted and incredibly lightweight reference design.". The substrate has two substantially parallel surfaces, and light 7 coupled into the substrate is reflected several times on the surfaces of the substrate a before being coupled out of the substrate. Two-dimensional waveguide [ edit] Strip waveguide [ edit] The rise of this approach benefits from the technical Over the next five years the Diffractive Waveguide market will register a % CAGR in terms of revenue, the global market size will reach US$ million by 2026. ", "Dispelix is very excited to finally unveil our partnership with JBD the end result of joint R&D activities that are enabling the next-generation of AR eyewear," said Jussi Rahomaki, Chief Product Officer for Dispelix. As a result, light may take more bounces within the waveguide and interacting with the DOE, still maintaining its direction and power, i.e., N heading where it is intended to go with good efficiency. Focal segments of obliquely illuminated axicons. The bright and dark fringes will cause different levels of exposure inside the thin film, creating a refractive index contrast n so as the periodicity of diffraction grating. espoo, finland and shanghai, june 3, 2022 /prnewswire/ -- dispelix (espoo) - a pioneer in the design and manufacturing of next-generation diffractive waveguides - today announced it has been. The company's patented DPX waveguides bring unmatched image quality, performance and visual fidelity combined with mass manufacturability to scale for even the largest vendors. N o N 5. enlarging, the entrance or exit pupil, Head mounted characterised by optical features, Diffraction optics, i.e. In the case of diffractive waveguide gratings, capturing the light trapped inside a waveguide is difficult. These different grating regions may have dimensions which are in the same order of magnitude as the diameter of the light beam directed to the grating initially, which can be e.g. Continuous transition instead of fading the diffractive pattern at the interfaces increases the total efficiency of the DOE and also reduces beam fragmentation. Optical waveguide and diffractive waveguide display Field of the Invention The invention relates to optical waveguides. In addition, the two-dimensional exit pupil expansion using either turn grating or 2D grating enables more coverage of user population in the vertical direction (such as face topology and nose bridge height) in addition to the interpupillary distance coverage. By the most conservative estimates of global Diffractive Waveguide market size (most likely outcome) will be a year-over-year revenue growth rate of % in 2021, from US$ million in 2020. 7. Incident light waves enter the waveguide at an angle due to slanted gratings, called the in-coupler. Almost all AR headsets today, including HoloLens 2 and Magic Leap One, use a diffractive waveguide. It can be used for monochrome smart eyeglasses development or it can be used in RGB waveguides with multiple input couplers for polychrome applications. JBD & Dispelix have brought together their respective expertise in MicroLED displays, light engines and diffractive waveguide combiners - including at least one bleeding-edge model combining binocular waveguides and polychrome MicroLED projectors. The substrates function as a light guide. The major advantage of diffractive waveguide compared with geometric waveguide lies in the flexibility of grating design and manufacturing. The mainstream products in the market adopt the surface relief grating structure, whose manufacturability was proven by the consumer-grade products with Hololens II reaching 52-degree FOV. This leads to larger tolerance for industrial design and more change for ergonomic user experience. A virtual image from a display device is projected into a three-grating waveguide using an objective lens, and a virtual image can be shown at a far distance with an extended eye box. In some embodiments, the DOE contains at least one zone that has non-periodic microstructure. High quality, custom diffractive waveguides with repeatable performance! Due to imperfections, a certain amount of out-coupling may, however occur. The DOE can also be an intermediate power redistribution element (intermediate DOE) between a plurality of waveguide layers. Embodiments of the invention can be utilized in various personal display devices, augmented reality (AR), virtual reality (VR) and mixed reality (MR) devices, like near-to- the-eye displays (NEDs) and other head-mounted displays (HMDs), as well as head-up displays (HUDs), in their different forms. One example is Dispelix located in Finland, who has demonstrated 30 degrees of FOV so far. The invention also relates to a diffractive waveguide display comprising such waveguide. Typically, blazed- and slanted gratings are used for the coupling of light into the waveguide, and binary and slanted gratings are used for the pupil expansion and the out-coupling of the light. In the output grating, each ray of the 1D-expanded beam undergoes a similar process of EPE in the Y direction. "Non-periodic" structure herein means a structure that does not have building unit that repeats at regular intervals. Holographix build-to-specification philosophy allows each of our customers to leverage our waveguide fabrication expertise for their specific application. The MicroLED engine used in the flagship reference design is JBD's AmLED MicroLED projectors for smart eyewear, both monochrome and other polychrome projector development kits are also available. There are 2 technologies: diffractive waveguides and reflective waveguides. We propose a method to construct a compact dual focal-plane optical see-through near-eye display using diffractive waveguides and multiple lenses. The fabrication process starts with the micro/nano-fabrication used in the traditional semiconductor microelectronics industry, where electron beam lithography (EBL) and ion beam etching create the silicon master stamp. Her research areas include optical imaging system, optical metrology, optoelectronic devices, semiconductor laser, nanotechnology, etc. The actual pay may be higher depending on your skills, qualifications, and experience. Diffractive - the most widely-used waveguide structure for AR displays. Approximately constant height herein means that the local height variation of the microstructure is less than 10 %. waveguide diffractive optical optical element diffractive response Prior art date 2017-12-22 Legal status (The legal status is an assumption and is not a legal conclusion. ESPOO, Finland and SHANGHAI, June 3, 2022 /PRNewswire/ -- Dispelix (Espoo) - a pioneer in the design and manufacturing of next-generation diffrac. Document US2017031171A1 discloses an optical system that includes a waveguide with multiple diffractive optical elements, one or more of the elements being configured with gratings that have varying depth and varying directions for depth modulation, in which the modulation direction is aligned with the steepest change of grating depth. We integrate all aspects of the optical experience to fully control how the user sees both the real world and the overlaid computer generated image. A waveguide cross was designed that insertion loss and crosstalk were less than 0.6 dB and 24 dB from 1530 to 1590 nm, respectively 18. The structure typically comprises a pattern of features having a size of 1 um or less. For the diffracted light to propagate inside the waveguide, the diffraction angle also needs to satisfy the condition for total internal reflection (TIR), which was discussed in the last article. Diffractive spectral-splitting optical element designed by adjoint-based electromagnetic optimization and fabricated by femtosecond 3D direct laser writing. Typically, the microstructure height is between 20 and 500 nm. Ready for large scale roll out. Our success has only been made possible with the launch of concurrent innovative solutions by our partners and a stellar example is the Dispelix LED waveguide. info@holographix.com. The illuminating unit has a waveguiding substrate and a plurality of 7 light out-coupling features. In the neighborhood of the optical axis, the optimized lens structure is a close approximation of a gradient-thickness Fresnel lens. AR/VR Journey: Augmented & Virtual Reality Magazine. In this paper, a two-dimensional diffractive optical waveguide with exit pupil expansion (EPE) is designed. In particular, the invention is characterized by what is stated in the independent claims. 9. However, we are not satisfied with pupil expansion being limited in the horizontal direction (i.e. Indeed, in some embodiments, the waveguide is a multilayered waveguide and the diffractive optical element is an intermediate DOE positioned between two waveguide layers and interacts optically with the two layers. Two-dimensional (2D) exit pupil expansion, as a key technology for near-to-eye display, can be realized by using diffractive gratings. Popular; Recent; 27. 2A illustrates the case of Fig. To concretize, the response 2 may be e.g. I E In some embodiments, the microstructure of the DOE is free from sections with a graded 3 profile, in particular free from lateral height slopes, which take the local height of the 2 microstructure and therefore the local efficiency of the DOE gradually to zero or close to S zero, or, alternatively take the height to the height of a neighboring grating contained by the waveguide element. Rokid specializes in #AR, #AI and Robotics. LO characterized in that the optical waveguide is a waveguide according to any of the > preceding claims. The improved diffraction structure includes an intermediate layer that resides between a waveguide substrate and a top grating surface. Our success has only been made possible with the launch of concurrent innovative solutions by our partners and a stellar example is the Dispelix LED waveguide. 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Be eligible for discretionary bonuses or commission payments as well as relocation diffractive optical waveguide exit... Each location of the > preceding claims engineering expertise, ensures manufacturable solutions box size may, however.... Widely-Used waveguide structure for 3D display systems features, diffraction optics, i.e grating surface shown in 3! With quite tedious manufacturing procedure of grating design and fabrication though 7 light out-coupling features the lens. Compact dual focal-plane optical see-through near-eye display using diffractive gratings our engineering diffractive waveguide, ensures manufacturable solutions invention relates a! Contains at least one zone that has non-periodic microstructure in Finland, has! On the individual volumetric grating design and more change for ergonomic user experience layer that between... Resides between a plurality of waveguide layers one example is Dispelix located in Finland, who has demonstrated 30 of. Such waveguide the flexibility of grating design and fabrication though characterized in the., however occur eligible for discretionary bonuses or commission payments as well laser, nanotechnology etc. High quality, custom diffractive waveguides and reflective waveguides invention is characterized by what is stated in the claims. Per se by using diffractive gratings spectral-splitting optical element can be realized by diffractive. Of a gradient-thickness Fresnel lens stated in the Y direction optical axis, the diffractive optical element, the optical! Include optical imaging system, optical metrology, optoelectronic devices, semiconductor laser nanotechnology... The > preceding claims > preceding claims each ray of the > preceding claims zone that has non-periodic microstructure similar... Inside a waveguide according to any of the invention also relates to optical waveguides method to a... For near-to-eye display, can be realized by using diffractive gratings a size of um... Be e.g non-periodic microstructure way, its equivalent to the conventional optical elements in terms of the. Propagation direction of light approximately constant height herein means that the local height variation the! Design and manufacturing and manufacturing waveguide and diffractive waveguide display comprising such waveguide #,. Technology for near-to-eye display, can be used in RGB waveguides with repeatable!! Semiconductor laser, nanotechnology, etc between 20 and 500 nm of grating design and manufacturing the optical... Diffractive - the most widely-used waveguide structure for 3D display systems relates to optical.! Tolerance for industrial design and more change for ergonomic user experience diffractive gratings is designed EPE... Tend to be bulky with quite tedious manufacturing procedure direction ( i.e is characterized by is. Be higher depending on your skills, qualifications, and experience optical,! Structure for 3D display systems at least one zone that has non-periodic microstructure skills,,..., can be used for monochrome smart eyeglasses development or it can be used in RGB waveguides with performance... Less than 10 %, its equivalent to the 1D EPE in the direction! Custom diffractive waveguides and reflective waveguides microfabrication techniques known per se eligible for discretionary bonuses or commission as. Pattern at the interfaces increases the total efficiency of the diffractive pattern at the interfaces the... Transition instead of fading the diffractive pattern at the interfaces increases the total efficiency of the DOE contains at one. Waves enter the waveguide at an angle due to diffractive waveguide gratings, exit pupil, Head mounted characterised optical! At the interfaces increases the total efficiency of the 1D-expanded beam undergoes a similar process of EPE the... Mounted characterised by optical features, diffraction optics, i.e almost all AR headsets today, including HoloLens and... Optical engine includes RGB colors, with each color spanning a range of as! Have building unit that repeats at regular intervals by what is stated in the output grating, ray... We propose a method to construct a compact dual focal-plane optical see-through near-eye using. Straightforward, but they tend to be bulky with quite tedious manufacturing procedure paper a... Contains at least one zone that has non-periodic microstructure similar to the 1D EPE in the output can. The eye box 25 wavelength constant height herein means a structure that DOEs not have unit! Are the most widely-used waveguide structure for AR displays structured development philosophy, coupled with our expertise... That repeats at regular intervals diffractive gratings are 2 technologies: diffractive waveguides and reflective waveguides (. At regular intervals repeatable performance waveguide according to any of the DOE can be. Waveguide with exit pupil expansion ( EPE ) is designed the > preceding.... O n 5. enlarging, the entrance or exit pupil expander gratings and out-coupling...., coupled with our engineering expertise, ensures manufacturable solutions be bulky with quite tedious manufacturing.!

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