| abstract |
(57) [Summary] (Modified) [Problem] To provide a liquid crystal display element having a temperature-dependent threshold voltage. A pair of carrier plates spaced apart from each other to form a space therebetween, means for sealing the plates to form a chamber, and a layer of a liquid crystal material having a positive dielectric anisotropy existing in the chamber. Consisting of at least one derivative of 2,6-difluorobenzonitrile of the general formula II in which a strong dielectrically positive additive works over a certain operating temperature range and improves the temperature coefficient of the threshold voltage. Liquid crystal display device. (R represents a C 1-15 alkyl group, a C 3-15 alkenyl group, and ring A represents a 1,4-phenylene, 2-fluoro or 3-fluoro-1,4-phenylene, or a 1,4-cyclohexylene group , Z 1 and Z 2 are —CH 2 CH 2 —, — It represents COO— or a single bond, and Z 2 may be —C≡C—. ) |