Switchable light filter, lighting device and screen
US12411378B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2024 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Mar 4, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13475
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a switchable light filter (5), comprising a first optical element (1), in turn comprising a plurality of light-absorbing transition dipole moments, so that light, which is incident into the first optical element (1), is transmitted or at least partially absorbed as a function of its direction of incidence with respect to the first optical element (1) and its polarization state, means for optionally generating a first electric field (EF1) or a second electric field (EF2), a liquid crystal layer (3), onto which the first electric field (EF1) or the second electric field (EF2) acts, so that the transmission properties of the switchable light filter (5) differ between a first operating mode B1. The invention further discloses lighting devices and screen, which use an afore-described switchable light filter (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.