Four-ring liquid crystal compound having lateral fluorine, liquid crystal composition and liquid crystal display device
申请人:Kobayashi Masahide
公开号:US08394294B2
公开(公告)日:2013-03-12
The invention provides a liquid crystal compound which has stability to heat, light and so forth, a nematic phase in a wide temperature range, a small viscosity, a large optical anisotropy, and a suitable elastic constant K33, and further has a suitable and negative dielectric anisotropy and an excellent compatibility with other liquid crystal compounds. Moreover, the invention provides a liquid crystal composition comprising this liquid crystal compound and a liquid crystal display device containing this liquid crystal composition.
A liquid crystal compound represented by formula (a):
for example, R1 and R2 are alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkoxy having 1 to 9 carbons; ring A1 and ring A2 are 1,4-phenylene or trans-1,4-cyclohexylene; L1 and L2 are hydrogen or fluorine, and at least one of L1 and L2 is fluorine; and Z1 and Z2 are a single bond, —(CH2)2—, —CH═CH—, —CH2O— or —OCH2—.
本发明提供了一种液晶化合物,具有耐热、耐光等稳定性,在宽温度范围内具有向列相、小粘度、大光学各向异性和适当的弹性常数K33,并且具有适当且负的介电各向异性以及与其他液晶化合物良好的相容性。此外,本发明提供了一种包含该液晶化合物的液晶组合物和一种包含该液晶组合物的液晶显示装置。
一种由式(a)表示的液晶化合物:
例如,R1和R2是具有1到10个碳的烷基,具有2到10个碳的烯基或具有1到9个碳的烷氧基;环A1和环A2是1,4-苯撑基或反-1,4-环己撑基;L1和L2是氢或氟,且L1和L2中至少有一个是氟;Z1和Z2是单键,—(CH2)2—,—CH═CH—,—CH2O—或—OCH2—。