Liquid crystal display element

Claim 2

A liquid crystal display element with static or multiplex control with a low multiplex ratio and an operating voltage below 3.3 volts, containing a liquid crystal dielectric, wherein the operating temperature range extends from -30° C. to +80° C. and the viscosity of the dielectric at 20 ° C. is less than 40 mPa.s, wherein the dielectric contains at least one component of the formula I ##STR5## wherein R 1 is alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by O atoms, --CO--, --O--CO--, --CO--O-- and/or --CH═CH-- groups, A o and A 1 each independently of one another are Cy, Dio or Phe, Z is --CH 2 --O--, --O--CH 2 or a single bond, X 1 is F, Cl, --CN or --NCS, X 2 is F, Cl and, in the case where X 1 =NCS, also H, m is 0 or 1, Cy is trans-1,4-cyclohexylene, Dio is trans-1,3-dioxane-2,5-diyl and Phe is 1,4-phenylene which is unsubstituted or substituted by fluorine.

Claim 3

Liquid crystal display element according to claim 1, wherein the dielectric contains at least one component of the formula II ##STR6## wherein R 1 is alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O-- and/or --CH═CH--, Q 1 is trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and or S, Q 2 is trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, or 1,4-phenylene which is unsubstituted or substitited by flourine and wherein one or more CH groups can be replaced by N, Z o is --CO--O--, CH 2 O-- or --CH 2 CH 2 --, X 1 is F, Cl, --CN or --NCS and X 2 is F, Cl or, if X 1 =NCS, also H.

Claim 4

Liquid crystal display element according to claim 1, wherein the dielectric contains at least one component of the formula III R.sup.1 --Q.sup.1 --(Q.sup.2).sub.n --X.sup.3 III wherein R 1 is alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O-- and/or --CH═CH--, Q 1 is trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, Q 2 is trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, of 1,4-phenylene which is unsubstituted or substituted by fluorine and wherein one or more CH groups can be replaced by N, n is 1 or 2 and X 3 is --CN or --NCS.

Claim 5

Liquid crystal display element according to claim 1, wherein the dielectric contains at least one component of the formula IV R.sup.1 --(Q.sup.1 --Z.sup.1).sub.m --Q.sup.2 --Q.sup.2 --(Z.sup.1 --Q.sup.1).sub.P --R.sup.2 IV wherein R 1 and R 2 each independently of one another are alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by --O--, --CO--, --O--CH--, --CO--O-- and/or --CH═CH--, the symbols Q 1 each independently of one another are trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, the symbols Q 2 each independently of one another are trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, or 1,4-phenylene which is unsubstituted or substituted by fluorine and wherein one or more CH groups can also be replaced by N, the symbols Z 1 each independently of one another are --CO--O--, --O--CO--, --CH 2 O--, --OCH 2 , --CH 2 CH 2 -- or a single bond and m and P are each 0 or 1.

Claim 6

Liquid crystal display element according to claim 1. wherein the dielectric contains at least one component of the formula V R.sup.1 --Cy--Q.sup.o --R.sup.2 V wherein R 1 and R 2 each independently of one another are alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by --O--, --CO--, --O--CO-- --CO--O-- and/or --CH═CH--, Q o is Cy or Phe, Phe is 1,4-phenylene which is unsubstituted or substituted by fluorine and Cy is trans-1,4-cyclohexylene.

Claim 7

Liquid crystal display element according to claim 1, wherein the dielectric contains at least one component of the formula VI R.sup.1 --Phe--Phe--CN VI wherein R 1 is alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by O atoms, --CO--, --O--CO--, --CO--O-- and/or --CH═CH-- groups and Phe is 1,4-phenylene.

Claim 8

Liquid crystal display element according to claim 1, wherein the dielectric contains at least one component of the formula VII R.sup.1 --(Q).sub.n --COO--Phe-R.sup.2 VII wherein R 1 and R 2 each endependently of one another are alkyl with 1 to 12 C atoms, wherein one or two non-adjacent CH 2 groups can also be replaced by --O--, --CO--, --O--CO--, --CO--O--, and/or --CH═CH--, R 2 is also CN, Q is trans-1,4-cyclohexylene, wherein one or two non-adjacent CH 2 groups can also be replaced by O and/or S, or Phe, Phe is 1,4-phenylene which is unsubstituted or substituted by fluorine and n is 1 or 2, and if n=2, the two groups Q can be identical or different from one another.