Light-guide optical element and method of its manufacture
US10895679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | Jan 19, 2021 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0172
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical structure and corresponding process of manufacture for light guide optical elements (LOEs) which guide light by reflection at major surfaces. The structure further includes light directing surfaces for coupling light out of the LOE, obliquely inclined with respect to the major surfaces. The optical structure is formed from a stack of multiple optically transparent layers each of which has a surface pattern of regions configured as light directing surfaces which are arranged in an X-Z plane in a spaced-apart relationship along at least the X-axis with optically transparent regions between them. The layers are stacked along a Y-axis so that each of the surface patterns is located at an interface between two adjacent layers and the patterns of the layers are aligned with a shift of a predetermined value along one or both of the X-axis and Z-axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.