Film-based lightguide with interior light directing edges with curved sections in a tapered light mixing region
US12117639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2023 |
| Grant date | Oct 15, 2024 |
| Priority date | — |
| Expiry date | Jul 7, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0078
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a film-based lightguide comprises a plurality interior light directing edges in a tapered light mixing region with curved sections which redirect light within the tapered light mixing region of the film. The interior light directing edges may be formed by cuts in the film that create an air gap between internal edges of the film. In one embodiment, the difference between radii of curvature of neighboring radii of arc sections of interior light directing edges is within 20% of an average distance between the arc sections. In one embodiment, the interior light directing edges totally internally reflect light propagating through the tapered light mixing region such that the light propagates at a smaller angle to a direction orthogonal to a width direction and orthogonal to the thickness direction of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.