51results about How to "Proper Dielectric Anisotropy" patented technology

Provided is a liquid crystal compound satisfying at least one physical property from among having excellent stability with respect to heat, light, or the like, a high clearing point, a low liquid-crystal-phase lower limit temperature, a low viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a suitable elastic constant, and excellent compatibility with other liquid crystal compounds. The compound is represented by formula (1). In formula (1): R1 and R2 represent C1-15 alkyl groups; ring A1 and ring A2 represent 1, 4-cyclohexylene or 1, 4-phenylene; Z1 and Z2 represent single bonds, -(CH2)2-, -CH=CH-, -C≡C-, -COO-, -OCO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, or -CF=CF-; a and b represent 0, 1, or 2; and the sum of a and b is 1 or 2.

The invention discloses a liquid crystal composition containing bicycle-octane, belonging to the field of liquid crystal display materials. The liquid crystal composition is composed of 1-40% of a positive dielectric compound containing a component A shown in the general formula I, 2-40% of a positive dielectric compound containing a component B shown in the general formula II and / or general formula III and 10-80% of a neutral dielectric compound containing a component C shown in the general formula IV; in addition, optically active compound which is 0-0.5% of the sum of the mass of the liquid crystal composition is added. The liquid crystal composition is low in viscosity, short in response time, proper in photology, good in anisotropy, proper in dielectric anisotropy and particularly suitable for manufacturing quick-response active matrix TN-TFTs (Twisted Nematic Thin Film Transistors), IPS-TFTs (In-Plane Switching Thin Film Transistors) or FFS (Fringe Field Switching) liquid crystal display elements and liquid crystal displays.