Patent ID: 8947760
Filing Date: 2015-02-03
Classification: G02B,G02F

Abstract:
1. A thermotropic shutter device comprising a first transparent substrate; a second transparent substrate; one or more thin film polarizing coatings applied to at least the first transparent substrate, the one or more polarizing coatings acting as a linear polarizer when applied to at least the first transparent substrate; and a thermotropic liquid crystal depolarizer supported by the first and second transparent substrates that rotates a polarity of light perpendicular to that of the thin film polarizing coatings on the first substrate and passing therethrough to a perpendicular polarity when in a twisted nematic state; wherein in a cold state the thermotropic liquid crystal depolarizer is in the twisted nematic state and the device exhibits a high transmission within a given wavelength band, and in a hot state the thermotropic liquid crystal depolarizer is not in the twisted nematic state and the device exhibits a low transmission within a given wavelength band.