Optical device for use in an augmented reality or virtual reality device
US11036046B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 2018 |
| Grant date | Jun 15, 2021 |
| Priority date | — |
| Expiry date | Aug 20, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device or display is disclosed for use in an augmented reality or virtual reality device. The display includes a waveguide (2), an output element (4) and a plurality of input diffraction gratings (6, 8, 10, 12). Light from a plurality of projectors (16, 18, 20, 22) is diffracted by the input gratings (6, 8, 10, 12) so that it is coupled into the waveguide (2) by total internal reflection. The input gratings (6, 8, 10, 12) are provided in a staggered configuration in relation to the output element (4), with respect to a y-axis. Each input grating is adjacent another input grating that has a different separation distance from the output element (4). This can improve the evenness of illumination from the output element (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.