摘要:
The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
摘要:
The invention relates to a matrix liquid crystal display containing integrated non-linear elements and a liquid crystal mixture which has a particularly high resistivity.
摘要:
Supertwist liquid crystal displays having very short switching times are obtained if the nematic liquid crystal mixture contains at least one component chosen from group A consisting of compounds of the formulae AI to AVI: ##STR1## wherein R.sup.1 and R.sup.2 in each case independently of one another are each R and R is alkyl having 1-12 C atoms, wherein one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --CH.dbd.CH--, --CO--, --O--CO-- or --CO--O--, and up to four other components.
摘要:
The invention relates to liquid crystal compounds having a terminal structure in accordance with formula 1, 2, 3 or 4:--A.sup.3 --OCF.sub.3 1--A.sup.2 --Q--CHF.sub.2 2--3,5-difluoro-1,4-phenylene-X.sup.1 3--3-fluoro-1,4-phenylene-X.sup.2 4wherein A.sup.2, A.sup.3, X.sup.1 and X.sup.2 and are defined herein. The invention further relates liquid crystal phases containing the above components as well as electrooptical displays containing same.
摘要:
The invention relates to a liquid-crystalline medium essentially comprisinga) 5-65% by weight of a component A, comprising two or more compounds selected from group A: ##STR1## b) 20-95% by weight of a component B comprising two or more compounds selected from group B: ##STR2## and c) 0-40% by weight of a component C, comprising one or more compounds having a clearing point above 170.degree. C., where R, X and Y each, independently of one another, have the following meanings:R is in each case alkyl, oxaalkyl, haloalkyl or alkenyl having up to 7 carbon atoms,X is F, Cl, CHF.sub.2, CF.sub.3, OCHF.sub.2 or OCF.sub.3, andY is H, F or Cl.
摘要:
The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which L is H or F, X is F, Cl, CF.sub.3, OCF.sub.3 or OCHF.sub.2, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.
摘要:
Cyclohexane derivatives of the formula IR.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --R.sup.2 Iin whichR.sup.1 and R.sup.2 are each an alkyl group having 1-10 C atoms, in which one or two non-adjacent CH.sub.2 groups can also be replaced by O atoms and/or --CO-- groups and/or --CO--O-- groups and/or --CH.dbd.CH-- groups, one of the radicals R.sup.1 and R.sup.2 also being H, F, Cl, Br, CN or R.sup.3 --A.sup.3 --Z.sup.2 --,A.sup.1 is --A--, A.sup.4 --A-- or --A--A.sup.4 --,A is a trans-1,4-cyclohexylene group which can be substituted in the 2-, 3-, 5- and/or 6-position one or more times by F and/or Cl and/or Br and/or CN and/or an alkyl group or a fluorinated alkyl group which each have 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups, and which may also be substituted in the 1- and/or 4-position,A.sup.2, A.sup.3 and A.sup.4 are each 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 groups and/or CN groups and in which one or two CH groups can also be replaced by N atoms and/or NO; 1,4-cyclohexylene in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms; or 1,3-dithiane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo-(2,2,2)octylene, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl groups,Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O or a single bond, andR.sup.3 is H, an alkyl group having 1-10 (sic), in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups and/or CH.dbd.CH-- groups, or is F, Cl, Br or CN,with the proviso that in the case of Z.sup.1 =--CO--O-- A.sup.1 carries no equatorial substituent in the .beta.-position relative to the --CO--O--bridge, are suitable for use as components of liquid-crystalline phases.
摘要:
Compounds of the formula IR--(A.sup.1 -A.sup.1).sub.m --A.sup.2 --Q--CHF.sub.2 Iin which R, A.sup.1, Z.sup.1, m, A.sup.2 and Q have the meaning given in Patent Claim 1 are suitable as components of liquid-crystalline media.
摘要:
Biphenylylethanes of the formula I ##STR1## in which one of the radicals R.sup.1 and R.sup.2 is X and the other radical R.sup.1 or R.sup.2 is R--Y-- whereX is H, halogen, --CF.sub.3, --OCHF.sub.2, --OCF.sub.3, --CN, --NCS or --NO.sub.2,R is alkyl, fluoroalkyl, alkenyl or oxaalkyl andY is O, S, --CO--O--, --O--CO--, --O--CO--O--, a single bond or--in the case where m=1--alternatively trans-1,4-cyclohexylene or ##STR2## m is 1 or 2, Ph is in each case identical or different radicals selected from the group comprising 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene and 3,5-difluoro-1,4-phenylene,L.sup.3 and L.sup.4 are each H, or one of these radicals is alternatively F,L.sup.1, L.sup.2and L.sup.5 are each H or F, with the proviso that in the case where X=CN or R.sup.1 =--NCS, Y is trans-1,4-cyclohexylene or ##STR3## and/or m=2 and/or one of the radicals L.sup.1, L.sup.2 and L.sup.3 is fluorine and/or Ph--CN is 2-fluoro-4-cyanophenyl or 3,5-difluoro-4-cyanophenyl,are suitable as components of liquid-crystalline phases.