Compound having fluorodibenzofuran ring, liquid crystal composition and liquid crystal display device
申请人:JNC CORPORATION
公开号:US10662378B2
公开(公告)日:2020-05-26
Provided are liquid crystal compounds satisfying at least one of physical properties such as high stability to heat or light, a high clearing point (or high maximum temperature), low minimum temperature of a liquid crystal phase, small viscosity, large optical anisotropy, large negative dielectric anisotropy, a suitable elastic constant and good compatibility with other liquid crystal compounds, a liquid crystal composition containing the compound and a liquid crystal display device including the composition. The compound is represented by formula (1):
wherein R1 and R2 are independently hydrogen or alkyl having 1 to 15 carbons; and A1, A2 and A3 are independently 1,4-cyclohexylene or 1,4-phenylene;
Z1, Z2 and Z3 are independently a single bond;
Y1, Y2, Y3 and Y4 are independently hydrogen, fluorine or the like; and
a, b and c are independently 0 or 1, and a sum of a, b and c is 0 to 3.
本发明提供的液晶化合物至少具有以下一种物理性质:对热或光的稳定性高、清澈点(或最高温度高)高、液晶相的最低温度低、粘度小、光学各向异性大、负介电各向异性大、弹性常数合适以及与其他液晶化合物的兼容性好;还提供了含有该化合物的液晶组合物和包括该组合物的液晶显示设备。该化合物用式(1)表示:
其中 R1 和 R2 独立地为氢或具有 1 至 15 个碳原子的烷基;A1、A2 和 A3 独立地为 1,4-环己烯或 1,4-亚苯基;
Z1、Z2 和 Z3 独立地为单键;
Y1、Y2、Y3 和 Y4 独立地是氢、氟或类似物;以及
a、b 和 c 独立地为 0 或 1,a、b 和 c 的总和为 0 至 3。