2D pupil expander using holographic Bragg grating
US10295723B1 · kind B1 · utility
7Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 2018 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | May 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A holographic Bragg grating is used as an output element for a waveguide in a lens used for artificial reality. By using a Bragg grating, a number of waveguides can be reduced. The output element has a first super grating and a second super grating written in a single grating layer of the waveguide. The first super grating has a grating vector that is skew to a grating vector of the second super grating to provide both deflection and out coupling for two-dimensional output coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.