| abstract |
A liquid crystalline medium comprises a plurality of polymerizable monomers and a plurality of liquid crystal molecules. The liquid crystal molecules are selected from at least one of compounds 1, 2, 3, 4, 5, and 6. n n n n n n n n n n “G 1 ”, “G 3 ” and “G 5 ” are independently alkyl having 1 to 8 carbons or alkyenyl having 2 to 8 carbons. “G 2 ” and “G 6 ” are independently alkyl having 1 to 8 carbons or alkoxy having 1 to 7 carbons. “G 4 ” is alkyl of 1 to 8 carbons, alkyenyl of 2 to 8 carbons or alkoxy of 1 to 7 carbons. “Z 1 ” is single bond, ethyl or methoxy. “Z 2 ” is single bond, ethyl, methoxy, or caroboxyl. “Z 3 ” is single bond, ethyl, difluoromethoxy, difluoropropoxy or ethyl carboxyl. “Z 4 ” is single bond, ethyl, difluoromethoxy, or difluoropropoxy. n nare independently 1,4-cyclohexylene or 1,4-phenylene. One of “E 1 ” and “E 2 ” is fluorine, and the other is chlorine. |