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| Arrangement for the display of processing data by means of pixels on a cathode ray tube |
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Liquid crystal phase
| Details |
Inventors: Scheuble, Bernhard; Weber, Georg; Krause, Joachim;
Assignee: Merck Patent Gesellschaft mit beschrankter Haftung (Darmstadt, DE)
Primary Examiner: Gron; Teddy S.
Assistant Examiner: Thomas; J. E.
Attorney, Agent or Firm: Millen & White
The invention relates to liquid crystal phases (LC phases) having a particularly low threshold voltage, a particularly low ratio K.sub.3 /K.sub.1 of the elastic constants for bending (K.sub.3) and spreading (K.sub.1) and broad nematic phase ranges, these phases containing at the same time at least one highly polar component of reduced degree of association and, to reduce the quotient K.sub.3 /K.sub.1 of the elastic constants for bending (K.sub.3) and spreading (K.sub.1) of the phases to a value.ltoreq.1.1, at least one apolar liquid crystal component. |
|
DETAILED DESCRIPTION We claim: 1.
A liquid crystal phase having at least five liquid crystal components and a threshold voltage <1.
6 volt, and containing at least 18% of a highly polar component of reduced degree of association and, effective to reduce the phase's quotient of K.
sub.
3 /K.
sub.
1 of the elastic constant for bending (K.
sub.
3) and spreading (K.
sub.
1) to a value .
ltoreq.
1.
1, at least 27% of an apolar liquid crystal component having a dielectric anisotropy in the range from -2 to +2, wherein the highly polar component of reduced degree of association is at least one of the compounds: ##STR8## in which R is a straight-chain alkyl group of 1 to 7 C atoms and in which a CH.
sub.
2 group can be replaced by --O-- or --CH.
dbd.
CH--, the apolar liquid crystal component is at least one of the compounds: ##STR9## in which alkyl and alkoxy are each a straight-chain alkyl or alkoxy group of 1 to 7 C atoms, R.
degree.
is a straight-chain alkyl or alkoxy group or an oxaalkyl or alkenyl group of 1 to 7 C atoms, R is a straight-chain alkyl group of 2 to 10 C atoms, in which a CH.
sub.
2 group can be replaced by --O-- or --CH.
dbd.
CH--, and R.
sup.
2 is butyryloxy, and the pyrimidine compounds of formulae Io to Ir and/or IIa are present in a total amount of 27 to 61%.
2.
A phase according to claim 1, which contains at least three compounds of formula Id, Ie, Ii or Il or Ir.
3.
A phase according to claim 2, which contains at least four of said apolar components.
4.
A phase according to claim 3, which contains at least 32% of an apolar liquid crystal component.
5.
A phase according to claim 1, which contains at least one compound of formula IIa.
6.
A phase according to claim 1, which contains at least one compound of formula Io.
7.
A phase according to claim 1, which contains at least one compound of the following formulas: ##STR10## in which R is a straight-chain alkyl group of 1 to 7 C atoms, in which in addition a CH.
sub.
2 group can also be replaced by --O-- or --CH.
dbd.
CH--, ##STR11## Cy is trans-1,4-cyclohexylene and Ph is 1,4-phenylene
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