Light projecting method and device
US10641942B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 2018 |
| Grant date | May 5, 2020 |
| Priority date | — |
| Expiry date | Jul 16, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A waveguide comprises a first surface and a second surface. The second surface comprises a first plurality of grating structures. The waveguide is configured to guide an in-coupled light beam to undergo total internal reflection between the first surface and the second surface. The grating structures are configured to disrupt the total internal reflection to cause at least a portion of the in-coupled light beam to couple out of the waveguide from the first surface, the portion of the in-coupled light beam coupled out of the waveguide forming out-coupled light beams. The waveguide further comprises a reflective layer disposed on the second surface and covering the first grating structures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.