Patent ID: 9535271
Date: 2017-01-03
CPC Classifications: C09K,G02F

Claim:
1. Device for regulating the passage of energy through a light-transmitting area, where the device comprises the following layers: a first polarisation layer, a second polarisation layer, and a switching layer, arranged between the two polarisation layers, which changes the polarisation properties of polarised light as a function of temperature, where the two polarisation layers have, identically or differently, a degree of polarisation P in the range 20-85% and a transmission in the transmission direction T1 in the range 70-100%, determined at a wavelength of 550 nm, and where one or both of the polarisation layers are formed from a layer comprising a liquid-crystalline medium and one or more dichroic dyes, with the one or more dichroic dyes present in an amount of 0.01 to 5% by weight of said liquid crystalline medium.