2,3-difluorophenyl derivative having negative dielectric anisotropy, liquid crystal composition, and liquid crystal display device
申请人:Chisso Corporation
公开号:US06548126B1
公开(公告)日:2003-04-15
The invention is to provide liquid crystalline compounds having a negative and extremely large dielectric anisotropy value and a small optical anisotropy value at the same time; liquid crystal compositions comprising the compound; and liquid crystal display devices fabricated by using the liquid crystal composition; the liquid crystalline compounds have 2,3-dihalogenophenylene moiety and are expressed by formula (1)
wherein Ra and Rb each independently represents a linear or branched alkyl having 1 to 10 carbon, any methylene in the alkyl may be replaced by —O—, —S—, —CH═CH—, or —C≡C—, but —O— is not successive, and any hydrogen in the alkyl may be replaced by halogen; rings A1 to A4 each independently represents trans-1,4-cyclohexylene, cyclohexene-1,4-diyl, pyridine-1,4-diyl, pyrimidine-2,5-diyl, or 1,4-phenylene, wherein at least one hydrogen in these rings may be replaced by halogen, and any nonadjacent methylene in cyclohexane ring may be replaced by —O—; Y1 and Y2 each independently represents F or Cl; Z1, Z2 and Z3 each independently represents a single bond, —CH2CH2—, —(CH2)4—, —COO—, —OCO—, —CH2O—, —OCH2—, —CF2O—, or —OCF2—; and l, m and n each independently is 0, 1 or 2, and the sum of l+m+n is 3 and less.
本发明提供了具有负的极大介电各向异性值和小的光学各向异性值的液晶化合物;包括该化合物的液晶组合物;以及使用该液晶组合物制造的液晶显示器件。液晶化合物具有2,3-二卤代苯基团,由式(1)表示,其中Ra和Rb各自独立地表示具有1至10个碳的线性或支链烷基,烷基中的任何亚甲基可以被—O—,—S—,—CH2CH—或—C≡C—替代,但—O—不连续,烷基中的任何氢可以被卤素替代;环A1至A4各自独立地表示反-1,4-环己基,环己烯-1,4-二基,吡啶-1,4-二基,嘧啶-2,5-二基或1,4-苯基,其中这些环中至少有一个氢可以被卤素替代,环己烷环中任何不相邻的亚甲基可以被—O—替代;Y1和Y2各自独立地表示F或Cl;Z1、Z2和Z3各自独立地表示单键,—CH2CH2—,—(CH2)4—,—COO—,—OCO—,—CH2O—,—OCH2—,—CF2O—或—OCF2—;l、m和n各自独立地为0、1或2,且l+m+n的和为3或更少。