阅读说明：本技术 液晶介质 (Liquid-crystalline medium ) 是由 M·恩格尔 A·乔伊塔兹 于 2018-12-11 设计创作，主要内容包括：本发明涉及一种液晶介质,其包含至少一种式X化合物,<Image he="110" wi="700" file="DDA0002591966990000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>及选自式IIA、IIB及IIC的化合物的组的一种或多种化合物,<Image he="469" wi="700" file="DDA0002591966990000012.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>其中所出现的基团及参数具有权利要求1中所指示的含义,且涉及其用于特别地基于VA、PSA、PA-VA、SS-VA、SA-VA、PS-VA、PALC、IPS、PS-IPS、UB-FFS、U-IPS、FFS或PS-FFS效应的有源矩阵显示器的用途。(The invention relates to a liquid-crystalline medium comprising at least one compound of the formula X, and one or more compounds selected from the group of compounds of formulae IIA, IIB and IIC, wherein the radicals and parameters mentioned have the meanings indicated in claim 1, and to the use thereof for active-matrix displays based in particular on the VA, PSA, PA-VA, SS-VA, SA-VA, PS-VA, PALC, IPS, PS-IPS, UB-FFS, U-IPS, FFS or PS-FFS effect.)

1. A liquid-crystalline medium, characterized in that it comprises one or more compounds of the formula X,

wherein

R^X1And R^X2Each independently of the other, H, alkyl or alkoxy having 1 to 15C atoms, wherein, in addition, one or more CH groups of these radicals₂The radicals may each, independently of one another, be-C.ident.C-, -CF in such a way that the O atoms are not directly linked to one another₂O-、-OCF₂-、-CH＝CH-、-O-, -CO-O-, -O-CO-and wherein, in addition, one or more H atoms may be replaced by halogen,

n represents 0 or 1, and

Z^X1each occurrence independently of the others being-CO-O-, -O-CO-, - -CF₂O-、-OCF₂-、-CH₂O-、-OCH₂-、-CH₂-、-CH₂CH₂-、-(CH₂)₄-、-CH＝CH-CH₂O-、-C₂F₄-、-CH₂CF₂-、-CF₂CH₂-, -CF ═ CF-, -CH ═ CF-, -CF ═ CH-, -CH ═ CH-, -C ≡ C-or a single bond, and

optionally, preferably essentially, one or more compounds of the formula I

Wherein

R¹¹And R¹²Each independently of the other, H, alkyl or alkoxy having 1 to 15C atoms, wherein, in addition, one or more CH groups of these radicals₂The radicals may each, independently of one another, be-C.ident.C-, -CF in such a way that the O atoms are not directly linked to one another₂O-，-OCF₂-，-CH＝CH-，-O-, -CO-O-, -O-CO-and wherein, in addition, one or more H atoms may be replaced by halogen,

refer to each occurrence independently of the other

a)1, 4-cyclohexenylene or 1, 4-cyclohexylene, in which one or two non-adjacent CH' s₂The radicals may be replaced by-O-or-S-,

b)1, 4-phenylene in which one or two CH groups may be replaced by N,

c) from the group of the radicals piperidine-1, 4-diyl, 1, 4-bicyclo [2.2.2] octylene, naphthalene-2, 6-diyl, decahydronaphthalene-2, 6-diyl, 1,2,3, 4-tetrahydronaphthalene-2, 6-diyl, phenanthrene-2, 7-diyl and fluorene-2, 7-diyl,

wherein the radicals a), b) and c) may be mono-or polysubstituted by halogen atoms,

Z¹¹refer to each occurrence independently of the others: -CO-O-, -O-CO-, -CF₂O-、-OCF₂-、-CH₂O-、-OCH₂-、-CH₂CH₂-、-(CH₂)₄-、-CH＝CH-CH₂O-、-C₂F₄-、-CH₂CF₂-、-CF₂CH₂-, -CF ═ CF-, -CH ═ CF-, -CF ═ CH-, -CH ═ CH-, -C ≡ C-, or a single bond, and

L¹¹and L¹²Each independently of the others denotes F, Cl, CF₃Or CHF₂，

X¹Denotes O or S, and

a denotes a number of 1 or 2, preferably 1,

and one or more compounds selected from the group of compounds of formulae IIA, IIB and IIC,

wherein

R^2A、R^2BAnd R^2CEach independently of the others denotes H, unsubstituted, CN or CF having up to 15C atoms₃Alkyl or alkenyl which are monosubstituted or at least monosubstituted by halogen, where, in addition, one or more CH groups are present₂The groups may be substituted by-O-, -S-,

L¹to L⁴Each independently of the other denotes F or Cl,

Z²and Z^2’Each independently of the other being a single bond, -CH₂CH₂-、-CH＝CH-、-CF₂O-、-OCF₂-、-CH₂O-、-OCH₂-、-COO-、-OCO-、-C₂F₄-、-CF＝CF-、-CH＝CHCH₂O-，

p denotes 0, 1 or 2,

q denotes 0 or 1, and

v denotes 1 to 6.

2. Liquid-crystalline medium according to claim 1, characterized in that the medium comprises one or more compounds selected from the group of compounds of the formulae I-1 to I-3,

wherein the parameters have the meanings given in claim 1.

3. Liquid-crystalline medium according to claim 1 or 2, characterized in that it comprises one or more compounds selected from the group of compounds of the formulae I-O-1 to I-O-3:

wherein the parameters have the meanings given in claim 1.

4. Liquid-crystalline medium according to one or more of claims 1 to 3, characterized in that it comprises one or more compounds selected from the group of compounds of the formulae I-S-1 to I-SO-3:

wherein the parameters have the meanings given in claim 1.

5. Liquid-crystalline medium according to one or more of claims 1 to 4, characterised in that it comprises one or more compounds of formula IIA:

wherein the parameters have the meaning given in claim 1.

6. Liquid-crystalline medium according to one or more of claims 1 to 5, characterised in that it additionally comprises one or more compounds of the formula IIB,

wherein the parameters have the meanings given in claim 1.

7. Liquid-crystalline medium according to one or more of claims 1 to 6, characterised in that the medium comprises one or more compounds of the formula IIC,

wherein the parameters have the meanings given in claim 1.

8. Liquid-crystalline medium according to one or more of claims 1 to 7, characterized in that the medium additionally comprises one or more compounds selected from the group of compounds of the formulae O-1 to O-18,

wherein

R¹And R²Each independently of the others, having the meanings indicated for R in claim 1^2AThe meaning indicated.

9. Liquid-crystalline medium according to one or more of claims 1 to 8, characterized in that the medium additionally comprises one or more compounds selected from the group of compounds of the formulae T-1 to T-21,

wherein

R denotes straight-chain alkyl or alkoxy having 1 to 6C atoms, and m ═ 0, 1,2,3,4, 5 or 6 and n denotes 0, 1,2,3 or 4.

10. Liquid-crystalline medium according to one or more of claims 1 to 9, characterised in that the proportion of the compound of the formula X in the mixture as a whole is from 1 to 40% by weight.

11. Liquid-crystalline medium according to one or more of claims 1 to 10, characterised in that the proportion of the compounds of the formulae IIA to IIC in the medium as a whole is in the range from 10% to 70%.

12. Process for the preparation of a liquid-crystalline medium according to one or more of claims 1 to 11, characterized in that one or more compounds of the formula X are mixed with one or more compounds selected from the group of compounds of the formulae IIA to IIC and one or more compounds of this formula.

13. Use of a liquid-crystalline medium according to one or more of claims 1 to 11 in electro-optical displays.

14. Electro-optical display with active matrix addressing, characterized in that it contains a liquid-crystalline medium according to one or more of claims 1 to 11 as dielectric.

15. The electro-optic display of claim 15, wherein the electro-optic display is a VA, PSA, PA-VA, SS-VA, SA-VA, PS-VA, PALC, IPS, PS-IPS, FFS, UB-FFS, U-IPS or PS-FFS display.