Optical device comprising a multi-layers waveguides
US12210155B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2019 |
| Grant date | Jan 28, 2025 |
| Priority date | — |
| Expiry date | Aug 7, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/012
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
It is proposed an optical device for delivering a polychromatic image to an eye box being an area positioned in front of an eye of a user wearing said optical device. The optical device is remarkable in that it comprises: • a light-engine for delivering said polychromatic image, said light engine being able to generate n different monochromatic light image beams [C1, . . . , Ci, . . . , Cn], whom combination corresponds to said polychromatic image, each monochromatic light image Cj being associated with a wavelength Ay, and wherein Ai+1>A£ for all the i E [1, n], and wherein the monochromatic light image beams Cj is in a transverse electric mode if j is odd, and the monochromatic light image beams Cj is in a transverse magnetic mode if j is even; • n-waveguide elements (502, 503, 504) that are stack on each other, n being an integer greater or equal to three, each waveguide element, except the one closer to the eye of a user, comprising a diffraction grating that can deviate only one of said n monochromatic light image in the waveguide element by total internal reflection, a first output that delivers deviated light toward said eye box, and a second output that delivers non-deviate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.