Liquid-crystalline medium, useful in electro-optical display such as in-plane switching display and fringe-field switching display i.e. useful in monitors, notebooks, and TVs, comprises substituted halo compounds

摘要

Liquid-crystalline medium having positive dielectric anisotropy, comprises at least substituted halo compounds (I)-(V). Liquid-crystalline medium having positive dielectric anisotropy, comprises at least substituted halo compounds of formulae (I)-(V). R11, R21 : unsubstituted, monosubstituted 1-15C-alkyl or -alkenyl substituted by CN or CF 3 or at least monosubstituted by halo, where one or more CH 2 groups are replaced by -O-, -S-, 1,3-dimethyl-cyclobutane, -CC-, -OC-C-, or -COO- in such a way that O atoms are not directly linked to each other; X11 : F, Cl, CN, halogenated 1-6C alkyl, 1-6C alkoxy or halogenated 2-6C alkenyl; X12 : monosubstituted alkyl or alkenyl having 2-6C substituted by F, where one or more CH 2 groups are replaced by -CC-, NCS, SCF 3, or CHF 2; L11-L13, Y21, Y22 : H or F; A11, A21, A22 : divalent group of formulae (a)-(b); A12-A13 : divalent group of formulae (c), (d), (e), (f) and (a); A14 : divalent group of formulae (h)-(i); A15 : divalent group of formula (e); and X21 : F, Cl, CN, OCHF 2, OCF 3, unsubstituted alkyl-, alkoxy-, or alkenyl having 2-6C. Independent claims are included for: (1) preparing the medium, comprising mixing (I)-(IV) and (V) with substituted halo compounds of formula (VI), and at least one or more substituted alkyl compounds of formula (VII) and (VIII), one or more further mesogenic compounds and/or one or more additives; and (2) an electro-optical display comprising a re-orientation layer for re-orienting the liquid crystals, whose field has a component crucial for the re orientation parallel to the liquid-crystal layer, and the liquid-crystalline medium as dielectric medium. R31 : unsubstituted, monosubstituted 15C-alkyl or -alkenyl substituted by CN or CF 3 or at least monosubstituted by halo, where one or more CH 2 groups are replaced by -O-, -S-, 1,3-dimethyl-cyclobutane, -CC-, -OC-C-, or -COO- in such a way that O atoms are not directly linked to each other; X31 : F, Cl, CN, halogenated 1-10C alkyl, 1-10C alkoxy or 2-10C alkenyl; Y31, Y32 : F; Y33, Y34, L : H or F; R41, R51-R52 : alkyl or alkoxy having 1-10C or 2-10C alkenyl; R42 : R41 or X41; A41, A42 : divalent group of formulae (a) and (j); and X41 : F, Cl, CN, halogenated 1-6C alkyl, 1-6C alkoxy or 2-6C alkenyl. [Image] [Image] [Image] [Image].