| abstract |
A liquid crystal compound is provided, which not only has great negative dielectric anisotropy in addition to high clear point and low viscosity, but also has at least one of following properties: stability against heat, light and so on, appropriate refractive index anisotropy, great negative dielectric anisotropy, and good compatibility with other liquid crystal compounds. The compound is shown in formula (1-1) or formula (1-2): For example, R1 and R2 are independently hydrogen, alkyl having 1 to 10 carbons, or alkoxy having 1 to 9 carbons; ring A1, ring A2, ring A3, ring A4, ring A5, and ring A6 are independently 1, 4-cyclohexylene or 1, 4-phenylene; a, b, c, d, e and f are independently 0 or 1, the sum of a, b, c, d, e and f is 2; g, h, i, j, k and l are independently 0 or 1, the sum of g, h, i, j, k and l is 2. |