SPD FILM WITH DARKER OFF-STATE TRANSMITTANCE AND SPD FILM WITH LIGHTER ON-STATE TRANSMITTANCE

摘要

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: Matrix / capsule   ratio %   particles   in   the   capsule = Phase   ratio  :   %   particle   number 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 <0.5 and a DeltaT 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 DeltaT of >57%.