SPD films with darker off-state transmittances and lighter on-state transmittances

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 (I). 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 &Dgr;&Tgr; 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 &Dgr;&Tgr; of > 57%.