FOUR-RING LIQUID CRYSTAL COMPOUND HAVING LATERAL FLUORINE, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE
申请人:Kobayashi Masahide
公开号:US20110090450A1
公开(公告)日:2011-04-21
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 K
33
, 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, R
1
and R
2
are alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkoxy having 1 to 9 carbons; ring A
1
and ring A
2
are 1,4-phenylene or trans-1,4-cyclohexylene; L
1
and L
2
are hydrogen or fluorine, and at least one of L
1
and L
2
is fluorine; and Z
1
and Z
2
are a single bond, —(CH
2
)
2
—, —CH═CH—, —CH
2
O— or —OCH
2
—.
本发明提供一种液晶化合物,具有耐热、耐光等稳定性,在广泛的温度范围内具有向列相,粘度小,光学各向异性大,适当的弹性常数K33,进一步具有适当且负的介电各向异性,与其他液晶化合物具有良好的相容性。此外,本发明还提供了包含该液晶化合物的液晶组合物和包含该液晶组合物的液晶显示装置。一种由公式(a)表示的液晶化合物:例如,R1和R2是具有1至10个碳原子的烷基,具有2至10个碳原子的烯基或具有1至9个碳原子的烷氧基;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,且至少有一个是氟;Z1和Z2是单键,-(CH2)2-,-CH═CH-,-CH2O-或-OCH2-。