ELECTRICALLY CONTROLLABLE SYSTEM HAVING A SEPARATE FUNCTIONAL COMPONENT FOR CONTROLLING LIGHT TRANSMISSION THAT INCLUDES AT LEAST ONE TRANSPARENT LAYER SLOWING PHOTO REDUCTION DEGRADATION OF AN ACTIVE ELEMENT
US6486928B1 · kind B1 · utility
40Cited by
13References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Jun 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/172
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The subject of the invention is an electrically controllable system having variable light scattering and/or transmission, comprising a functional film (1, 21) provided with electrically conducting layers (2, 3, 22, 23), the said film having active elements in the form of polarizing particles, or of liquid crystals associated with dichroic dyes, and in suspension in a medium. The said system is provided with one or more means preventing/compensating for degradation by photoreduction of at least some of the active elements, especially degradation of the dichroic dyes and/or that of the polarizing particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.