Polymer dispersed liquid crystal (PDLC) films based on epoxy resins were prepared by UV cationic polymerization.The charged ions arose from photolysis of the UV-initiator remained in the liquid crystal (LC) droplet of the polymer matrix.These PDLC films doped with ions showed different reorientation of LC molecules and electro-optical properties than those prepared without ionic dopants.Therefore,the model of charged double layers at the LC droplet / polymer interface was set up in our study.In addition,this research reports an example of methods to prepare PDLC films using epoxies / acrylates as hybrid polymer matrix by UV cationic polymerization,and obtain PDLC films which possess good electro-optical properties.