Diffraction optical waveguide and grating structure thereof, and display device
US11846785B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2023 |
| Grant date | Dec 19, 2023 |
| Priority date | — |
| Expiry date | Jul 11, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffraction optical waveguide, a grating structure, and a display device are disclosed. An arrangement period of a grating line of the grating structure is T and the grating line has a cross-sectional profile with a narrow top and a wide bottom. The cross-sectional profile includes five feature points, which respectively have coordinates (0, 0), (L2, H2), (L3, H3), (L4, H4), (L5, 0), and satisfy: 0.2T≤L2<L3<L4≤L5≤T; L3≤0.8T; L3−L2≥0.1T; L4≥0.8T; 0≤H2≤λ; 0.2λ≤H3≤λ; 0.6λ≤H4≤1.8λ; max(H2, H3)≤H4; −0.6λ≤H3−H2≤0.6λ, 0.6λ≤H3+H2≤1.8λ; 0.5λ/T≤H3/L3≤2λ/T, where λ is a wavelength. According to an embodiment of the present disclosure, the cross-sectional profile can be adjusted by controlling parameters of the feature points, the optical effect is improved and degrees of freedom in design and regulation are increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.