SPD films with darker off-state transmittances and lighter on-state transmittances
US8922872B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Feb 7, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Feb 7, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/172
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light valve film forming a light-modulating element of a light valve, the film comprised of a cross-linked polymer matrix with a plurality of droplets of a liquid light valve suspension distributed therein. The film has a phase ratio: % particle number value calculated by the formula:In one embodiment the light valve film has a relatively low visible transmittance in the unpowered Off state such that the film has a % T of <0.05 and a ΔT of >42%. In another embodiment the light valve film has a relatively high visible transmittance in the On state such that the film has a % T of >70% and a ΔT of >57%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.