申请人:Seiko Epson Corporation
公开号:US05200110A1
公开(公告)日:1993-04-06
2-phenyl-5-(4'-trans-cyclohexyl) phenyl pyrimidine derivatives represented by the general formula: ##STR1## wherein R is a straight chain alkyl group having 1 to 10 carbon atoms; X is CN or F; Y is F or H; Z is F or H; and when X is F, at least one of Y and Z is H; and the cyclohexane ring is a trans isomer, exhibiting a nematic phase and having a high nematic phase-isotropic liquid phase transition temperature (N-I Point) and large positive dielectric constant anisotropy (.DELTA..epsilon.). The pyrimidine derivatives may be included in liquid crystal compositions for improved display devices having a wide temperature range, including a high N-I point, a low threshold voltage and a low driving voltage.
2-苯基-5-(4'-顺-环己基)苯基嘧啶衍生物的一般式表示为:##STR1## 其中R是直链烷基,其碳原子数为1到10;X是CN或F;Y是F或H;Z是F或H;当X为F时,至少有一个Y和Z为H;且环己烷环为顺异构体,表现出向列相,并具有高向列相-等向液相转变温度(N-I点)和大正电介质常数各向异性(Δε)。这些嘧啶衍生物可包含在液晶组合物中,以改善具有宽温度范围、包括高N-I点、低阈值电压和低驱动电压的显示装置。