Optical waveguide device for display and display device having the same
US11966060B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2024 |
| Grant date | Apr 23, 2024 |
| Priority date | — |
| Expiry date | Jan 9, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical waveguide device is disclosed, in which an input section comprises a first waveguide substrate and a first relief grating formed on a surface thereof, and refractive indices n1, n2 of the first relief grating and the first waveguide substrate satisfy n2<n1, such that a first maximum average number of reflections that a light beam within a predetermined FOV range is subjected to on the surface after diffraction of the predetermined order before leaving a region where the first relief grating lies, is N, and N≤2, wherein when N≤1, N≤M−0.25; when 1<N≤1.5, N≤M−0.5; and when 1.5<N≤2, N≤M−0.75, wherein M is a second maximum average number of reflections assuming the first waveguide substrate has the same refractive index as the first relief grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.