Light emitting device including variable transmission film to control intensity and pattern
US11333323B2 · kind B2 · utility
1Cited by
46References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2020 |
| Grant date | May 17, 2022 |
| Priority date | — |
| Expiry date | Oct 30, 2040 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21K9/232
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lamp includes a variable transmissive film and a light source arranged to transmit light through the variable transmissive film. The variable transmissive film includes an encapsulated dispersion containing a plurality of electrically charged particles and a fluid, the charged particles being movable by application of an electric field and capable of being switched between an open state and a diffusing state. In some embodiments, one portion of the variable transmission film is in the open state and one portion is in the closed state, thereby allowing light from the source to be shaped, e.g., into task lighting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.