Paper white PDLC system

摘要

PCT No. PCT/EP93/02145 Sec. 371 Date Feb. 24, 1995 Sec. 102(e) Date Feb. 24, 1995 PCT Filed Aug. 12, 1993 PCT Pub. No. WO94/04958 PCT Pub. Date Mar. 3, 1994The invention relates to a paper white PDLC system which between 2 electrode layers contains a PDLC film comprising a liquid crystal mixture forming microdroplets in an optically isotropic, transparent polymer matrix, in which one of the refractive indices of the liquid crystal mixture is matched to the refractive index of the polymer matrix nM, the transmission of which can be varied by applying an electrical voltage characterized in that the PDLC film exhibits the following properties: |+E,ovs n+EE -nM|>/=0.05wherein +E,ovs n+EE is the mean refractive index of the liquid crystal mixture defined via +E,ovs n+EE 2=+E,fra 1/3+EE (me2+2no2)mean droplet diameter/=20%