| 摘要 |
<p>#CMT# #/CMT# Liquid crystalline medium (A) comprises a mixture of dielectric negative, polar cyclohexane compounds (I). #CMT# : #/CMT# Liquid crystalline medium (A) comprises a mixture of dielectric negative, polar cyclohexane compounds of formula (I). R 11>, R 12> : H, up to 15C-unsubstituted alkyl or -alkenyl (where one or more CH 2-groups are substituted by -O-, -S-, -cyclobutane-1,4-yl-, -C?=C-, -CF 2-O-, -O-CF 2-, -CO-O- or -O-CO- (where O atoms are not directly connected)); ring A 11>-ring A 14> : 2,3-difluoro-benzene-1,4-yl, tetrahydro-pyran-2,5-yl moieties (all preferred), 3-chloro-2-fluoro-benzene-1,4-yl, 2-chloro-3-fluoro-benzene-1,4-yl, cyclohexene-1,4-yl moieties, cyclohexane-1,4-yl, 2-fluoro-cyclohexene-1,4-yl moieties, [1,3]dioxane-2,5-yl moieties, benzene-1,4-yl, 2-fluoro-benzene-1,4-yl moieties or 2,3-difluoro-benzene-1,4-yl; Z 11>-Z 13> : -CH 2-CH 2-, -CH=CH-, -C?=C-, -CH 2-O-, -O-CH 2-, -CO-O-, -O-CO-, -CF 2-O-, -O-CF 2-, -CF 2-CF 2- or a bond (preferred); and m, n : 0 or 1. An independent claim is included for an electro optical display comprising (A). #CMT#[Image]#/CMT# #CMT#USE : #/CMT# (A) is useful in an electro optical display, preferably active matrix display based on vertically aligned-, electrically controlled birefringence (ECB)-, plasma addressed liquid crystal -, fringing-field switching - or induced polarization effect (claimed). #CMT#ADVANTAGE : #/CMT# (A) exhibits very low switching time in ECB display and simultaneously exhibits broad nematic phase, favorable birefringence and high voltage holding ratio. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Composition: (A) further comprises a first dielectric negative, mesogen component (A1) from (I); a second dielectric negative, mesogen component (B) from one or more dielectric negative cyclohexane compounds of formula (II); a dielectric neutral, mesogen component (C) from one or more dielectric neutral cyclohexane compound of formula (III); another dielectric negative, mesogen component (D) from one or more dielectric negative cyclohexane compounds of formulae (IV) and (V); a chiral component (E) from one or more chiral compounds; cyclohex-1-enyl-2,3-difluoro-benzene compound of formula (IA-1); cyclohexane-2,3-difluoro benzene compound of formula (IB-1) or (IB-2); and fluorine substituted benzene compound of formula (IB-3) or (IB-4). R 21>, R 22> : H, up to 15C- alkyl or -alkenyl (where one or more CH 2-groups are substituted by -O-, -S-, cyclobutane-1,4-yl, -C?=C-, -CF 2-O-, -O-CF 2-, -CO-O- or -O-CO-, where O atoms are not directly connected); ring A 21>-ring A 24> : aromatic ring of formula (a), cyclohexane-1,4-yl, 2-fluoro-cyclohexene-1,4-yl, 3-fluoro-cyclohexene-1,4-yl, [1,3]dioxane-5,2-yl moieties, tetrahydro-pyran-2,5-yl moieties, cyclohexane-1,4-yl, 2-fluoro-benzene-1,4-yl or 3-fluoro-benzene-1,4-yl; L 21>, L 22> : (=C(X 2>))- or (=N-); X 2> : F, Cl, OCF 3, CF 3, CH 3, CH 2F or CHF 2; Z 21>-Z 23> : -CH 2-CH 2-, -CH 2-CF 2-, -CF 2-CH 2-, -CF 2-CF 2-,- CH=CH-, -CF=CH-, -CH=CF-, -C?=C-, -CH 2-O-, -O-CH 2-, -CO-O-, -O-CO-, -CF 2-O-, -O-CF 2- or a bond; R 31>, R 32> : R 11>; ring A 31>-ring A 34> : cyclohexane-1,4-yl, cyclohexene-1,4-yl moieties, 2-fluoro-benzene-1,4-yl, 3-fluoro-benzene-1,4-yl, [1,3]dioxane-2,5-yl moieties, tetrahydro-pyran-2,5-yl moieties, benzene-1,4-yl, 2-fluoro-benzene-1,4-yl moieties or 2,3-difluoro-benzene-1,4-yl; Z 31>, Z 33> : Z 11>; R 41>, R 42>, R 51>, R 52> : R 11>; ring A 41>-ring A 44> : 1,1,6,7-tetrafluoro-indan-5,2-yl moieties, 1,1,7-trifluoro-indan-5,2-yl moieties, cyclohexane-1,4-yl, 2-fluoro-benzene-1,4-yl, 3-fluoro-benzene-1,4-yl, [1,3]dioxane-2,5-yl moieties, tetrahydro-pyran-2,5-yl moieties, benzene-1,4-yl, 2-fluoro-benzene-1,4-yl moieties or 2,3-difluoro-benzene-1,4-yl; ring A 52>-ring A 54> : 1,2,8-trifluoro-naphthalene-7,3-yl moieties, 1,2-difluoro-naphthalene-3,7-yl moieties, 7,8-difluoro-1,2,3,4-tetrahydro-naphthalene-2,6-yl moieties, 1,8-difluoro-phenanthrene-2,7-yl, 3,4,5,6-tetrafluoro-phenanthrene-2, 7-yl, 4,7-difluoro-6H-benzo[c]chromene-3,8-yl moieties, 7,8-difluoro-chroman-2,6-yl moieties, 4,6-difluoro-dibenzofuran-3,7-yl, cyclohexane-1,4-yl, 2-fluoro-benzene-1,4-yl, 3-fluoro-benzene-1,4-yl, [1,3]dioxane-2,5-yl moieties, tetrahydro-pyran-2,5-yl moieties, benzene-1,4-yl, 2-fluoro-benzene-1,4-yl moieties or 2,3-difluoro-benzene-1,4-yl; ring A 51> : A 52> or a bond; and Z 41>-Z 43>, Z 51>-Z 53> : Z 11>; l, o, p, q, r, s, t, u : 0 or 1. Preferred Components: The amount of (I) is at least 15 wt.%, preferably 2-80 wt.%. (A) contains 1-4 connections of (I). The amount of (II)-(V) is 2-80 wt.%. The amount of benzene compound of formulae (IA-1) and (IB-1-IB-4) is at least 20 wt.%. #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#[Image]#/CMT# #CMT#EXAMPLE : #/CMT# No suitable example given.</p> |
