Patent · US Active

Switchable light filter and use thereof

US11906828B2 · kind B2 · utility

0Cited by

32References

23Claims

0Family size

Assignee

siOPTICA GmbH · DE

Inventors

André Heber · Weimar, DE
Andreas Bregulla · Duderstadt, DE
Yannick Bourgin · Großgölitz, DE
Markus Klippstein · Jena, DE

Key dates

Filing date	Sep 27, 2021
Grant date	Feb 20, 2024
Priority date	—
Expiry date	Sep 27, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG02F2203/48
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An optical element which can be utilized in various versions and implementations of switchable light filters having, in addition, polarization filters and/or other means for varying the polarization characteristics of light, for example, liquid crystal layers. A combination of switchable light filter and imaging display device makes possible a private viewing effect that can be switched on and off. The optical element comprises a first layer or a first layer and a plurality of further layers, each layer including a material with a plurality of light-absorbing transition dipole moments. At least in a first state, each transition dipole moment is oriented, with a tolerance of 10° at the maximum, parallel to a selectable preferential direction or fluctuates around it so that light which is incident in the optical element is transmitted or at least partially absorbed depending on its incident direction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.