| abstract |
PROBLEM TO BE SOLVED: To provide a medium for a liquid crystal display having a very high specific resistance and a low threshold voltage, in addition to a wide nematic phase range, switchability at low temperature and stability against UV, in addition to a wide range. I do. A liquid crystal medium based on a mixture of polar compounds having a positive dielectric anisotropy, comprising a compound of the general formula I Wherein Hal is fluorine or chlorine, and R is alkyl, alkenyl, or the like, and a general formula having a dielectric anisotropy of -1.5 to +1.5. I ': (Wherein R 1 and R 2 are n-alkyl, n-alkenyl, etc., and rings A 1 , A 2 and A 3 are 1,4-phenylene, 1,4- Z 1 and Z 2 such as cyclohexenylene are --CH 2 CH 2 -,- C≡C-, -CO-O-, -O-CO- or a single bond, m is 0, Component A comprising one or more compounds of the formula A liquid crystal medium further comprising: |