Light emitting device including variable transmission film to control intensity and pattern
US10823373B2 · kind B2 · utility
0Cited by
45References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2019 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | Dec 16, 2039 |
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 closed 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 a spotlight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.