Liquid-crystalline medium

Abstract

The present invention relates to liquid-crystalline (LC) materials and to energy efficient liquid-crystal displays (LCDs) containing these materials, especially to gaming displays and AR / VR headsets addressed by an active matrix and in particular to LC displays of the TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB- FFS, positive VA or positive PS-VA type.

Description

[0001]Foreignfiling_text P24-078 - 1 - Liquid-crystalline medium The present invention relates to liquid-crystalline (LC) media and to energy efficient liquid-crystal displays (LCDs) containing these media, especially to high contrast 5 gaming displays and AR / VR headsets addressed by an active matrix and in particular to LC displays of the TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB- FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA type. In a preferred embodiment, the LC media have positive dielectric anisotropy. 10 Liquid-crystal displays (LCDs) are used in many areas for the display of information. LCDs are used both for direct-view displays and for projection-type displays. The electro-optical modes used are, for example, the twisted nematic (TN), super twisted nematic (STN), optically compensated bend (OCB) and electrically controlled 15 birefringence (ECB) modes together with their various modifications, as well as others. All these modes utilise an electric field which generated substantially perpendicular to the substrates and the LC layer. Besides these modes, there are also electro-optical modes that utilise an electric field 20 which is substantially parallel to the substrates or the LC layer. For example, WO 91 / 10936 discloses a LC display in which the electric signals are generated in such a way that the electric fields have a significant component parallel to the LC layer, and which has since then become known as “in-plane switching” (IPS) display. The 25 principles of operating such a display are described, for example, by R.A. Soref in Journal of Applied Physics, Vol.45, No.12, pp.5466-5468 (1974). IPS displays contain an LC layer between two substrates with planar orientation, where the two electrodes are arranged on only one of the two substrates and preferably have 30 interdigitated, comb-shaped structures. On application of a voltage to the electrodes an electric field with a significant component parallel to the LC layer is generated between them. This causes realignment of the LC molecules in the layer plane. EP 0588568, for example, discloses various possibilities for the design of the 35 electrodes and for addressing an IPS display. DE 19824137 likewise describes various embodiments of such IPS displays. Foreignfiling_text P24-078 - 2 - Liquid-crystalline materials for IPS displays of this type are described, for example, in DE 19528104. Furthermore, so-called “fringe-field switching” (FFS) displays have been reported (see, 5 inter alia S.H. Jung et al., Jpn. J. Appl. Phys., Volume 43, No.3, 2004, 1028), which contain two electrodes on the same substrate, one of which is structured in a comb- shaped manner and the other is unstructured. A strong, so-called "fringe field" is thereby generated, i.e. a strong electric field close to the edge of the electrodes, and, throughout the cell, an electric field which has both a strong vertical component and 10 also a strong horizontal component. FFS displays have a low viewing-angle depen- dence of the contrast. FFS displays usually contain an LC medium with positive dielectric anisotropy, and an alignment layer, usually of polyimide, which provides planar alignment to the molecules of the LC medium. 15 Liquid-crystal displays of the IPS and FFS electro-optical mode are in particular suitable for use in modern desktop monitors, TV sets and multimedia applications. The LC media according to the present invention are preferably used in displays of this type. In general, dielectrically positive LC media having rather lower values of the dielectric anisotropy are used in FFS displays, but in some cases LC media having a 20 dielectric anisotropy of only about 3 or even less are also used in IPS displays. A further improvement has been achieved by the HB-FFS mode. One of the unique features of the HB-FFS mode in contrast to the traditional FFS technology is that it 25 enables higher transmittance which allows operation of the panel with less energy consumption. Another recently developed mode is the XB-FFS mode, wherein the LC medium additionally contains a polar liquid crystal compound with low dielectric anisotropy. 30 Liquid-crystal compositions which are suitable for LCDs and especially for FFS and IPS displays are known in prior art, for example, from JP 07-181439 (A), EP 0667555, EP 0673986, DE 19509410, DE 19528106 and DE 19528107. However, these compositions have certain disadvantages. Amongst other deficiencies, most of them 35 result in disadvantageously long addressing times, have inadequate values of the resistivity and / or require excessively high operating voltages. Both an improvement in the operating properties and also in the shelf life are necessary here. Foreignfiling_text P24-078 - 3 - FFS and IPS displays can be operated as active-matrix displays (AMD) or passive- matrix displays (PMD). In the case of active-matrix displays individual pixels are usually addressed by integrated, non-linear active elements such as, for example, thin-film 5 transistors (TFTs), while in the case of passive-matrix displays individual pixels are usually addressed by the multiplex method as known from the prior art. The displays according to the present invention are preferably addressed by an active matrix, preferably by a matrix of TFT. However, the LC media according to the 10 invention can also advantageously be used in displays having other known addressing means. Typical applications of IPS and FFS technologies are monitors, notebooks, televisions, mobile telephones, tablet PCs, etc. Both the IPS and the FFS technology have certain 15 advantages over other LCD technologies, such as, for example, the vertical alignment (VA) technology, e.g. a broad viewing angle dependency of the contrast. The provision of further LC media and the use thereof in a display having high transmission, a good black state and a high contrast ratio is a central challenge for 20 modern FFS and IPS applications. In addition, modern applications also require good low-temperature stability and fast addressing times. In the recent years, use of materials containing per- and polyfluoroalkyl substances 25 (PFAS) became controversial because of their adverse long-term health and environmental effects. Therefore, they are ongoing efforts towards reduction or even elimination of PFAS in various commercial products including LC compositions. Until now, it was not possible to design suitable LC media having a high contrast ratio 30 e.g. high elastic constants and Kav, low temperature stability and low response times. Therefore, the overall picture quality in such devices still requires a further improvement. In particular, in the area of gaming applications, for the purpose of achieving fast switching speed other parameters, which are relevant for the image quality, have been often sacrificed. 35 The present invention has the object of providing LC media, in particular for energy efficient gaming FFS and IPS displays and AR / VR headsets, but also for TN, positive Foreignfiling_text P24-078 - 4 - VA or STN displays, and in particular for active-matrix displays like those addressed by TFTs, which have a high average elastic constant Kavin combination with a low response time parameter (^1 / K1) and a low rotational viscosity and a relatively low birefringence ^n. Additionally, they need to have a high specific resistance, low 5 threshold voltage, high dielectric anisotropy, a good low temperature stability (LTS), fast response times, and enable high brightness. In case of FFS displays there is a need for further optimization of response time, contrast, brightness and reliability. However, it was found that the LC materials of the prior art do often not achieve all these requirements at the same time. Furthermore, it is often desired that the 10 corresponding LC media have a reduced content of PFAS or even entirely PFAS free. Surprisingly, the above technical problem was solved by providing LC media as described and claimed hereinafter. 15 EP3763802 describes LC media comprising one or more compounds of Formula T: 20 in which 25 30 , independently of each other, denote 35 Foreignfiling_text P24-078 - 5 - , 5 EP3839009A1 describes LC media comprising one or more compounds of Formula T: 10 and one or more compounds of formula L 15 20 Examples of EP3839009A1 teach inter alia LC media comprising a compound of Formula T in combination with a compound of Formula L. It has now been surprisingly found that LC media according to the present invention which contain a combination of one or more compounds of Formula I 25 I and one or more compounds selected from the following: 30 35 Foreignfiling_text P24-078 - 6 - 5 10 15 20 25 in which the individual substituents are specified in Claim 1, show several remarkable improvements, especially when being used in FFS mode displays, like a high average elastic constant Kav, a low response time parameter (γ1 / K1) in combination with a low rotational viscosity as well as a good solubility, and 30 enable fast response times. Additionally, the LC media according to the present invention have high clearing points, an excellent low temperature stability (LTS) and provide a best motion picture quality 35 and an improved overall image quality, in particular a high contrast. Furthermore, they have a reduced content of PFAS and, in some cases, can be even substantially PFAS free. Foreignfiling_text P24-078 - 7 - The present invention relates to a LC medium, characterised in that it comprises one or more compounds of Formula I 5 I in which the individual substituents have the following meanings: 10 A1denotes phenylene-1,4-diyl, in which, in addition, one or two CH groups may be replaced by N and one or more H atoms may be replaced by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2or OCF3,cyclohexane-1,4-diyl, in which, in addition, one or two non-adjacent CH215 groups may be replaced, independently of one another, by O and / or S and one or more H atoms may be replaced by F, cyclohexene-1,4-diyl, bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro[3.3]- heptane-2,6-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; 20 R1each, independently of one another, denote a H atom, a halogen atom, -CN, -SCN, -NCS, an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, 25 at O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy 30 group having 3 to 12 C atoms, in which one or more H atoms may be replaced by a halogen atom; X1denotes a halogen atom, preferably a F atom, CN, SCN, or NCS; 35 denotes a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non-adjacent CH2 Foreignfiling_text P24-078 - 8 - groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; 5 Z1denotes -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2H4-, -C2F4-, -CF2CH2-, -CH2CF2-, -CFHCFH-, -CFHCH2-, -CH2CFH-,-CF2CFH-, -CFHCF2-, -CH=CH-, -CF=CH-, -CH=CF-, -CF=CF-, -C^C- or a single bond; and 10 k denotes 0, 1, 2 or 3; and one or more compounds selected from the following: 15 20 in which the individual substituents have the following meanings: R0and R2each, independently of one another, denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are 25 , or -O-CO- in such a way that O atoms are not linked directly to one 30 another, and in which one or more H atoms may be replaced by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms; L1and L2each, independently of one another, denote H, F or Cl; 35 denotes a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non-adjacent CH2 Foreignfiling_text P24-078 - 9 - groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; and 5 m denotes 0 or 1; or 10 15 20 25 30 wherein "alkyl" denotes an alkyl group having 1 to 6 C atoms; "alkenyl" and "alkenyl*" each, independently of one another, denote an alkenyl group 35 having 2 to 6 C atoms. Foreignfiling_text P24-078 - 10 - The LC media according to the present invention are especially suitable for use in energy efficient LC displays and AR / VR headsets for gaming of the FFS, HB-FFS, XB- FFS and IPS mode based on dielectrically positive liquid crystals, and polymer stabilised variants thereof. 5 The invention further relates to the use of a LC medium as described above and below for electro-optical purposes, in particular for the use in LC displays, shutter glasses, LC windows, 3D applications, preferably in TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-HB-FFS, PS-XB-FFS, SA-HB-FFS, SA-XB-FFS, polymer 10 stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA and positive PS-VA displays, very preferably in FFS, HB-FFS, IPS, PS-HB-FFS and PS-IPS displays. The invention further relates to an electro-optical LC display containing a LC medium as described above and below, in particular a TN, PS-TN, STN, TN-TFT, OCB, IPS, 15 PS-IPS, FFS, HB-FFS, XB-FFS, PS-HB-FFS, PS-XB-FFS, SA-HB-FFS, SA-XB-FFS, polymer stabilised SA-HB-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA display, preferably a FFS, HB-FFS, IPS, PS-HB-FFS or PS-IPS display. In the present application, all atoms also include their isotopes. In some embodiments, 20 one or more hydrogen atoms (H) may be optionally replaced by deuterium (D); a high degree of deuteration enables or simplifies analytical determination of compounds, in particular in the case of low concentrations. 25 In Formulae I and LP1, if R1, R2and R0, denote an alkyl group and / or an alkoxy group, this may be straight-chain or branched. It is preferably straight-chain, has 2, 3, 4, 5, or 6 C atoms and preferably denotes ethyl, propyl, butyl, pentyl, hexyl, ethoxy, propoxy, butoxy, pentoxy, or hexyloxy, furthermore methyl, methoxy. R1, R2and R0preferably denote straight-chain alkyl having 1 to 6 C atoms or an alkenyl group having 30 2 to 6 C atoms. The term “alkyl” in Formulae Z3, Z3’, Z5, Z7’, Z9 and Z10 is preferably straight-chain alkyl group having 1, 2, 3, 4, 5, or 6 C atoms and preferably denotes methyl, ethyl, 35 propyl, butyl, pentyl, or hexyl. Foreignfiling_text P24-078 - 11 - Oxaalkyl preferably denotes straight-chain 2-oxapropyl (= methoxymethyl), 2- (= ethoxymethyl) or 3-oxabutyl (= 2-methoxyethyl), 2-, 3- or 4-oxapentyl, 2-, 3-, 4- or 5-oxahexyl. 5 If R1, R2and R0denotes an alkoxy or oxaalkyl group it may also contain one or more additional oxygen atoms, provided that oxygen atoms are not linked directly to one another. In another preferred embodiment, one or more of R1, R2and R0are selected from the 10 15 ene or C2-12-alkenylene and is H, C1-12-alkyl or C2-12-alkenyl, and very preferably one or 20 25 ,-O(CH2)2F, -O(CH2)3F, -O(CH2)4F.30 If R1, R2and R0denotes an alkenyl group, this may be straight-chain or branched. It is preferably straight-chain and has 2 to 10 C atoms. Accordingly, it denotes, in particular, vinyl, prop-1- or -2-enyl, but-1-, -2- or -3-enyl, pent-1-, -2-, -3- or -4-enyl, hex-1-, -2-, -3- , -4- or -5-enyl, hept-1-, -2-, -3-, -4-, -5- or -6-enyl, oct-1-, -2-, -3-, -4-, -5-, -6- or -7-enyl, non-1-, -2-, -3-, -4-, -5-, -6-, -7- or -8-enyl, dec-1-, -2- , -3- , -4- , -5- , -6- , -7- , -8- or -9- 35 enyl. Foreignfiling_text P24-078 - 12 - The terms “alkenyl” and “alkenyl*” in Formulae Z5, Z7’, Z9 and Z10 are preferably represented by a straight-chain alkenyl group having 2 to 6 C atoms. Accordingly, it denotes, in particular, vinyl, prop-1- or -2-enyl, but-1-, -2- or -3-enyl, pent-1-, -2-, -3- or -4-enyl. 5 If R1, and R0denotes an alkyl or alkenyl group which is at least monosubstituted by halogen, this group is preferably straight-chain, and halogen is preferably F or Cl. In the case of polysubstitution, halogen is preferably F. The resultant groups also include perfluorinated groups. In the case of monosubstitution, the fluorine or chlorine 10 substituent may be in any desired position, but is preferably in the ^-position. Particularly preferred group Y 1in Formula I and in Formula LP1 denotes an H atom, alkyl or alkenyl group having up to 3 atoms. Very particularly preferably, Y0and 15 Y1denote methyl group or an H atom, H atom being mostly preferred. A1in Formula I particularly preferably denote phenylene-1,4-diyl, which may also be mono- or polysubstituted by F, furthermore cyclohexane-1,4-diyl, cyclohexenylene-1,4- diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl. 20 A1in Formula I particularly preferably denote 25 , 30 preferably unsubstituted 1,4-phenylene, in which L1and L2denote halogen, CF3or CN, preferably F. Z1in Formula I particularly preferably denote -CF2O-, -OCF2- or a single bond, 35 wherein a single bond is mostly preferred. Foreignfiling_text P24-078 - 13 - Preference is furthermore given to compounds of Formula I in which R1denotes H, alkyl, alkenyl or alkynyl having up to 8, preferably up to 5 C atoms, each of which is optionally substituted by halogen, in particular by F. 5 Particularly preferred groups R1, R2and R0in Formulae I and LP1 denote H, halogen, or alkyl, alkenyl, alkynyl or alkoxy having up to 12, preferably up to 8 C atoms, each of which is optionally substituted by halogen, in particular by F, particularly preferred are H, F, alkyl, alkenyl or alkynyl having up to 8 C atoms. Preferably, at least one of the groups R1and R2and R0, respectively, is not H, particularly preferably none of the 10 groups R1in Formula I, and R2and R0in Formula LP1, respectively, is represented by a H atom. R1is very particularly preferably equal to alkyl. Very particularly preferably, R1is alkyl. R1, R2and R0each, independently of one another, very particularly prefer- ably denote unbranched alkyl having 1 to 5 C atoms. If R1, R2and R0denote 15 substituted alkyl, alkoxy, alkenyl or alkynyl, the total number of C atoms in the two groups R1, R2and R0, respectively, is preferably less than 10. Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, 20 n-hexyl, n-heptyl and n-octyl. Preferred alkenyl groups are, for example, ethenyl, propenyl, butenyl and pentenyl. Preferred alkynyl groups are, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, 25 heptynyl and octynyl. Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, n-octoxy. 30 Halogen atom preferably denotes F or Cl, F being mostly preferred. Particularly preferred compounds of Formula I are those selected from the following sub-formulae: 35 Foreignfiling_text P24-078 - 14 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 15 - 5 10 15 20 25 in which are as defined in Formula I. In a particularly preferred embodiment, the compounds of Formula I are selected from the structure I-1. 30 LC media according to the present invention having particularly high elastic constants and a low rotational viscosity are obtainable with the following compounds: 35 Foreignfiling_text P24-078 - 16 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 17 - I-1-10 5 I-2-1 10 I-2-2 I-2-3 15 I-2-3a 20 I-2-4 25 I-3-1 30 I-3-1 I-4-1 35 Foreignfiling_text P24-078 - 18 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 19 - 5 10 In a further preferred embodiment, the following compounds of Formula I can be used: 15 20 25 30 35 Foreignfiling_text P24-078 - 20 - 5 10 15 20 25 The compounds of Formula I can be prepared analogously to processes known to the person skilled in the art and described in standard works of organic chemistry, such as, for example, in Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Thieme-Verlag, Stuttgart. 30 The proportion of compounds of Formula I ωIor, preferably, the subformula I-1, in the LC medium is preferably from 0.5 to 20%, very preferably from 1 to 15%, most preferably from 2 to 10% by weight. 35 The one or more compounds of Formula LP1 may be preferably described by the following Formulae LP1-1: Foreignfiling_text P24-078 - 21 - in which 5 R0is an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl group having 2 to 6 C atoms in which one or more CH2groups are optionally 10 ch a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom; 15 R2is an alkyl group having 1 to 6 C atoms, in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, 20 , -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom; 25 Y0H or CH3The compounds of the general Formula LP1 can also be represented by one of the following: 30 LP1b 35 Foreignfiling_text P24-078 - 22 - 5 LP1d in which R0is an alkyl or an alkoxy group having 1 to 12 C atoms in which one or 10 more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, , -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a 15 halogen atom, preferably an alkyl group having 1 to 4 C atoms, alkenyl or an alkenyloxy group having 2 to 6 C atoms or a cycloalkyl or a cycloalkyloxy group having 3 to 6 C atoms, wherein vinyl, allyl or cyclopentyl are particularly preferable; 20 n denotes 1, 2, 3, 4 or 5; and m denotes 1, 2, 3 or 4. Particularly preferred compounds of Formula LP1 are those selected from the group 25 consisting of the following subformulae: 30 35 Foreignfiling_text P24-078 - 23 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 24 - 5 wherein preferably H. 10 Very preferred are the compounds of Formulae LP1-1a, LP1-1b and LP1-1c, mostly preferred is the compound Formula LP1-1a. The total proportion of the compounds of Formula LP1 or its subformulae in the LC medium is preferably from 2 to 35%, very preferably from 3 to 25%, mostly 15 preferred from 4 to 15% by weight. Preferred compounds of Formulae Z3, Z3’, Z5, Z7’, Z9 and Z10 are those selected from the following subformulae: 20 25 30 35 Foreignfiling_text P24-078 - 25 - 5 10 15 20 The total proportion of the compounds of Formulae Z3, Z3’, Z5, Z7’, Z9 and Z10 in the 25 LC medium is preferably from 2 to 35%, very preferably from 3 to 25%, mostly preferred from 4 to 15% by weight. The proportion of the compound of Formula Z3-3 is preferably from 2 to 25% by weight, more preferably from 6 to 20% by weight. Further components 30 In one preferred embodiment, the LC medium of the present invention comprises one or more compounds of Formula LP2 35 Foreignfiling_text P24-078 - 26 - 5 in which the individual substituents have the following meanings: R0has one of the meanings given for R0in Formula LP1; 10 X0has one of the meanings given for in Formula I; L1and L2have the meanings given for L1and L2in Formula LP1; has one of the meanings given in for in Formula I; and n denotes 0 or 1. 15 Preferably, the compound of Formula LP2 is described by the following Formulae LP2- 1 to LP2-4: 20 25 30 35 in which Foreignfiling_text P24-078 - 27 - R0is an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl group having 2 to 6 C atoms in which one or more CH2groups are optionally 5 ch a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom; 10 X0a F atom or an alkyl or an alkoxy group having 1 to 3 C atoms or an alkenyl or an alkenyloxy group having 2 or 3 C atoms in which one or more H atoms are replaced by a F atom; and 15 Y0H or CH3The compounds of the general Formula LP2 can also be represented by one of the following: 20 25 30 35 Foreignfiling_text P24-078 - 28 - 5 in which R0is an alkyl or an alkoxy group having 1 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, , 10 -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom, preferably an alkyl group having 1 to 4 C atoms, alkenyl or an alkenyloxy group having 2 to 6 C atoms or a cycloalkyl or a 15 cycloalkyloxy group having 3 to 6 C atoms, wherein vinyl, allyl or cyclopentyl are particularly preferable; n denotes 1, 2, 3, 4 or 5; and m denotes 1, 2, 3 or 4. 20 Particularly preferred compounds of Formula LP2 are those selected from the group consisting of the following subformulae: 25 30 35 Foreignfiling_text P24-078 - 29 - LP2-1d 5 LP2-1e 10 LP2-1f 15 LP2-1g 20 LP2-1h 25 LP2-1i 30 LP2-2a LP2-2b 35 Foreignfiling_text P24-078 - 30 - 5 10 wherein preferably H. Very preferred are compounds of Formulae LP2-1a, LP2-1b, LP2-1c, LP2-1d, and LP2- 15 1i, LP2-2b, LP2-3a, LP2-3c; mostly preferred is the compound Formula LP2-1b. In one preferred embodiment, the LC medium comprises one compound of Formula LP1 and one compound of Formula LP2. 20 The total proportion of the compounds of Formula LP2 or its subformulae in the LC medium is preferably from 2 to 35%, very preferably from 3 to 25%, mostly preferred from 4 to 15% by weight. 25 In one preferred embodiment, the LC medium may also comprise one or more compounds of Formula G 30 and / or one or more compounds of Formula U 35 Foreignfiling_text P24-078 - 31 - 5 in which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meanings: 10 R1, each, independently of one another, denote a H atom, an alkyl or an and R5alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups , 15 or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms; 20 R2an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non- adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, 25 , -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be 30 replaced by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms; R3and R6each, independently of one another, denote a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non-adjacent CH groups are optionally substituted by -C^C- 352, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; Foreignfiling_text P24-078 - 32 - A1, A2, each, independently of one another, denote phenylene-1,4-diyl, in which, A3and A4in addition, one or two CH groups may be replaced by N and one or more H atoms may be replaced by halogen, CN, CH3, CHF2, CH2F, 5 CF3, OCH3, OCHF2or OCF3, cyclohexane-1,4-diyl, in which, in addi- tion, one or two non-adjacent CH2groups may be replaced, independently of one another, by O and / or S and one or more H atoms may be replaced by F, cyclohexene-1,4-diyl, bicyclo[1.1.1]pentane-1,3- 10 diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro[3.3]heptane-2,6-diyl, tetrahydro- pyran-2,5-diyl or 1,3-dioxane-2,5-diyl; Z1, Z2, each, independently of one another, denote -CF2O-, -OCF2-, -CH2O-, Z3and Z4-OCH -, -CO-O-, -O-CO-, -C H -, -C F -, -CF CH -, -CH CF -, 152 2 4 2 4 2 2 2 2-CFHCFH-, -CFHCH2-, -CH2CFH-, -CF2CFH-, -CFHCF2-, -CH=CH-, -CF=CH-, -CH=CF-, -CF=CF-, -C^C- or a single bond; k, l, m, n each, independently of one another, denote 0, 1, 2 or 3. 20 Particularly preferred compounds of Formulae G and U are those selected from the following sub-formulae: 25 30 35 Foreignfiling_text P24-078 - 33 - Foreignfiling_text P24-078 - 34 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 35 - 5 10 15 20 25 in which R1, R2, R3, R4, R5and R6have the meanings indicated in general Formulae G and U. In a particularly preferred embodiment, the compounds of Formulae G and U are selected from the structures G-1 and U-1, wherein a combination of the compounds described by formulae G-1 and U-1 is mostly preferred. 30 Particularly preferred compounds of the general Formulae G and U are as follows: 35 Foreignfiling_text P24-078 - 36 - G-1-2 5 G-1-1a 10 G-1-2a G-4-1 15 G-4-1a 20 U-1-1 25 U-1-2 30 U-1-3 35 Foreignfiling_text P24-078 - 37 - 5 1 1 2 2 3 3 Foreignfiling_text P24-078 - 38 - 5 10 15 20 wherein n and m each, independently of one another, denote 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 25 10, 11 or 12. Mostly preferred compounds of Formula G include, in particular, one or more of the following: 30 35 Foreignfiling_text P24-078 - 39 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 40 - 5 10 15 20 25 In a further preferred embodiment, the following compounds of Formulae G can be used: 30 35 Foreignfiling_text P24-078 - 41 - G-1-11 5 G-1-12 G-1-13 10 G-1-14 15 G-1-15 G-1-16 20 G-1-17 25 G-1-18 30 G-1-19 G-1-20 35 Foreignfiling_text P24-078 - 42 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 43 - 5 10 15 In a further preferred embodiment, the following compounds of Formulae U can be used: 20 25 30 35 Foreignfiling_text P24-078 - 44 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 45 - 3 Foreignfiling_text P24-078 - 46 - 5 10 15 20 25 The proportion of compounds of Formula G ωGor, preferably, their subformula G-1-1, in the LC medium is preferably from 0.5 to 20%, very preferably from 1 to 15%, most 30 preferably from 2 to 10% by weight. The proportion of compounds of Formula U ωUor, preferably, their subformula U-1-1, in the LC medium is preferably from 0.5 to 20%, very preferably from 1 to 15%, most preferably from 2 to 10% by weight. Furthermore, the proportion of compounds of Formula G in the LC medium ωGis typically higher 35 than the proportion the compounds of Formula U in the LC medium ωU. In a particularly preferred embodiment, ωG≥ 1.5 * ωU, even more preferably, ωG≥ 2.0 * ωU. The cumulative proportion of compounds of Formulae G and U (ωG+ ωU) in the Foreignfiling_text P24-078 - 47 - LC medium is preferably from 2.0 to 30%, very preferably from 2 to 30%, most preferably from 5 to 20% by weight. In one preferred embodiment, the LC medium also comprises one or more compounds 5 selected from the following Formulae II and III: 10 15 wherein the individual substituents, independently of each other and on each occurrence identically or differently, have the following meanings: 20 25 30 35 Foreignfiling_text P24-078 - 48 - 5 10 R0one of the meanings given for R1and R2in Formula G; X0independently of one another F, Cl, a halogenated alkyl group, a 15 halogenated alkenyl group, a halogenated alkoxy group or a halogenated alkenyloxy group having up to 6 C atoms; independently of one another H or F; and Y0H or CH3. 20 Preferred compounds of Formula II and III are those wherein 0is H. Further preferred compounds of Formula II and III are those wherein R0denotes alkyl having 1 to 6 C atoms, very preferably ethyl or propy 25 l, denotes F or OCF3, very preferably F. In a preferred embodiment, the LC medium comprises one or more compounds of Formula II selected from the following subformulae: 30 35 Foreignfiling_text P24-078 - 49 - 5 10 15 20 25 30 35 in which R0 have the meanings given in Formula II. Foreignfiling_text P24-078 - 50 - Preferred compounds are those of Formula II-1, II-2 and II-3, very preferred those of Formula II-1 and II-2. In the compounds of Formulae II-1 to II-7 R0preferably denotes alkyl having 1 to 6 C 5 atoms, very preferably ethyl or propyl, preferably denotes F or OCF3, very preferably F. In one embodiment, the LC medium contains one or more compounds of Formula II or 10 their subformulae as described above and below, wherein 0is CH3. According to this preferred embodiment, the LC medium may comprise one or more compounds of Formula II selected from the following subformulae: 15 20 25 30 35 Foreignfiling_text P24-078 - 51 - 5 10 15 in which R0 have the meanings given in Formula II. 20 Preferred compounds are those of Formula IIA-1, IIA-2 and IIA-3, very preferred are those of Formula IIA-1 and IIA-2. In the compounds of Formulae IIA-1 to IIA-7 R0preferably denotes an alkyl group 25 having 1 to 6 C atoms, very preferably ethyl or propyl, preferably denotes F or OCF3, very preferably F. The proportion of the compounds of Formula II in the LC medium is typically from 0 to 20%, very preferably from 1 to 15%, most preferably from 2 to 10% by weight. 30 In a further preferred embodiment, the LC medium comprises one or more compounds of Formula III selected from the following subformulae: 35 Foreignfiling_text P24-078 - 52 - O 0 R O 5 F O 0 R O 10 F O 0 R O 15 F 0 20 R H H 25 O 0 R H 30 O 0 R H O 35 Foreignfiling_text P24-078 - 53 - O 0 R H 5 O O 0 R O 10 O 0 R H 15 O O O 0 20 R O 25 0 R H O 30 0 RHO 35 Foreignfiling_text P24-078 - 54 - 35 Foreignfiling_text P24-078 - 55 - 5 10 15 20 in which R0 have the meanings given in Formula II. 25 Preferred compounds are those of Formula III-1, III-4, III-6, III-16, III-19 and III-20. In the compounds of Formulae III-1 to III-21 R0preferably denotes an alkyl group having 1 to 6 C atoms, very preferably ethyl or propyl, preferably denotes F or 30 OCF3, very preferably F, preferably denotes H. The LC medium may contain one or more compounds of Formula III or their subformulae as described above and below wherein 0is CH3. The medium according to this preferred embodiment may comprise one or more compounds of 35 Formula III selected from the following subformulae: Foreignfiling_text P24-078 - 56 - O 0 R O 5 F O 0 R O 10 F O 0 R O 15 F 0 20 R H H 25 O 0 R H 30 O 0 R H O 35 Foreignfiling_text P24-078 - 57 - O 0 R H 5 O O 0 R O 10 O 0 R H 15 O O O 0 20 R O 25 0 R H O 30 0 RHO 35 Foreignfiling_text P24-078 - 58 - F 0 R H O 5 F 0 R H O 10 0 RO O15 F 0 20 RO OF 25 0 RO O30 F 0 RO OF 35 Foreignfiling_text P24-078 - 59 - 5 10 15 in which have the meanings given in Formula III. 20 Preferred compounds are those of Formula IIIA-1, IIIA-4, IIIA-6, IIIA-16, IIIA-19 and IIIA-20. In the compounds of Formulae IIIA-1 to IIIA-21 R0preferably denotes alkyl having 1 to 25 6 C atoms, very preferably ethyl or propyl, 0preferably denotes F or OCF3, very preferably preferably denotes F. The proportion of the compounds of Formula III in the LC medium is preferably from 5 to 60%, very preferably from 10 to 50%, most preferably from 20 to 40% by weight. 30 In a further preferred embodiment, the LC medium may additionally comprise one or more compounds selected from the following formulae: 35 Foreignfiling_text P24-078 - 60 - 5 10 15 20 25 30 R0, X0, L1-4and Y0have the meanings indicated in Formulae II and III, Z0denotes -C H -, -(CH ) - 52 4 2, -CH=CH-, -CF=CF-, -C F -, 34 2 4-CH2CF2-, -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-,or -OCF2-, in Formulae V and VI also a single bond; and Foreignfiling_text P24-078 - 61 - s denotes 0 or 1. The compounds of Formula IV are preferably selected from the following formulae: 5 10 15 20 in which R0 have the meanings indicated in Formulae II and III. 25 R0preferably denotes alkyl having 1 to 6 C atoms. preferably denotes F or OCF3, furthermore OCF=CF2or Cl. The compounds of Formula IVa are preferably represented by the following subformula: 30 35 The compounds of Formula IVb are preferably represented by the following formula: Foreignfiling_text P24-078 - 62 - 5 The compounds of Formula IVc are preferably represented by the following subformula: 10 in which R0has the meanings indicated in Formula II and is preferably propyl or pentyl. 15 The compounds of Formula IVc, in particular of Formula IVc-1, are preferably employed in the LC media according to the invention in amounts of 1-20% by weight, particularly preferably 2-15% by weight. The compounds of Formula V are preferably selected from the following subformulae: 20 25 30 35 Foreignfiling_text P24-078 - 63 - 5 10 15 20 25 in which have the meanings indicated in Formula II. R0preferably denotes alkyl having 1 to 6 C atoms. preferably denotes F and OCF3, furthermore OCHF2, CF3, OCF=CF2and OCH=CF2. 30 The compounds of Formula VI are preferably selected from the following subformulae: 35 Foreignfiling_text P24-078 - 64 - 5 10 15 20 in which have the meanings indicated in Formula II. R0preferably denotes alkyl having 1 to 6 C atoms. 0preferably denotes F, 25 furthermore OCF3, CF3, CF=CF2, OCHF2and OCH=CF2; The compounds of Formula VII are preferably selected from the following subformulae: 30 35 Foreignfiling_text P24-078 - 65 - 5 in which R0 have the meanings indicated in Formula II. R0preferably denotes alkyl having 1 to 6 C atoms. preferably denotes F, furthermore OCF3, OCHF2and OCH=CF2. 10 In some embodiments, the LC medium additionally comprises one or more compounds selected from the following formulae: 15 20 25 30 35 Foreignfiling_text P24-078 - 66 - 5 10 each, independently of one another, have one of the meanings indicated in Formula II, 15 L1-4each, independently of one another, denote H or F, Y0denotes H or CH3, preferably H, X0is preferably F, Cl, CF3, OCF3or OCHF2, R0preferably denotes alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each 20 having up to 6 C atoms. Very preferably, the LC medium according to the invention comprises one or more compounds of Formula XXa: 25 30 in which R0has the meanings indicated in Formula LP1. R0preferably denotes straight- chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl. 35 The compounds of Formula XX, in particular of Formula XXa, are preferably employed in the LC media according to the invention in amounts of 0-15% by weight, particularly preferably 1-10% by weight. Foreignfiling_text P24-078 - 67 - Very preferably, the LC medium according to the invention comprises one or more compounds of Formula XXIa: 5 10 in which R0has the meanings indicated in Formula LP1. R0preferably denotes straight- chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl. 15 The compounds of Formula XXI, in particular of Formula XXIa, are preferably employed in the LC media according to the invention in amounts of 1-15% by weight, particularly preferably 2-10% by weight. Further preferably, the LC medium according to the invention comprises one or more 20 compounds of Formula XXIIIa: 25 in which R0has the meanings indicated in Formula LP1. R0preferably denotes straight- chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl or cycloalkyl, in particular cylclopentyl. 30 Preferred specific compounds of Formula XXIIIa include, in particular 35 Foreignfiling_text P24-078 - 68 - 5 The compounds of Formula XXIII, in particular of Formula XXIIIa, are preferably employed in the LC media according to the invention in amounts of 0.5-5% by weight, particularly preferably 0.5-2% by weight. 10 The LC medium may additionally comprise one or more compounds of Formula XXIV: 15 in which R0, X0and L have the meanings indicated in Formula III, s denotes 0 or 1, 20 and . 25 In Formula XXIV, X0may also denote an alkyl group having 1 to 6 C atoms or an alkoxy group having 1 to 6 C atoms. The alkyl or alkoxy group is preferably straight- chain. 30 R0preferably denotes alkyl having 1 to 6 C atoms. X0preferably denotes F; The compounds of Formula XXIV are preferably selected from the following subformulae: 35 Foreignfiling_text P24-078 - 69 - F R 5 10 R 15 20 R 25 30 35 R Foreignfiling_text P24-078 - 70 - 5 in which and L1have the meanings indicated in Formula III. R0preferably denotes alkyl having 1 to 6 C atoms. 0preferably denotes F, and L1is preferably F; 10 15 20 25 30 R0is straight-chain alkyl or alkenyl having 2 to 6 C atoms; The LC medium may further comprise one or more compounds of the following formu- 35 lae: Foreignfiling_text P24-078 - 71 - 5 10 in which R1and X0have the meanings indicated in Formula II for R0and X0, respectively. R1preferably denotes alkyl having 1 to 6 C atoms. X0preferably denotes F or Cl. In Formula XXIV, X0very particularly preferably denotes Cl. 15 The LC medium may further optionally comprise one or more compounds of the following formulae: 20 25 30 35 Foreignfiling_text P24-078 - 72 - in which R1and X0have the meanings indicated in Formula II for R0and X0, respectively. R1preferably denotes alkyl having 1 to 6 C atoms. X0preferably denotes F. The LC medium according to the invention particularly preferably comprises one or more compounds of Formula XXIX in which X0preferably denotes F. 5 The compounds of Formulae XXV - XXX are preferably employed in the LC media according to the invention in amounts of 1-20% by weight, particularly preferably 1-15% by weight. Particularly preferred LC media comprise at least one compound of Formula XXIX. 10 Very preferably, the LC medium according to the invention comprises one or more compounds of Formula XXIXa: 15 20 in which R1has the meanings indicated in Formula II, and preferably denotes straight- chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl. The compounds of Formula XXIXa are preferably employed in the LC media according to 25 the invention in amounts of 1-15% by weight, particularly preferably 2-10% by weight. The LC medium may further comprise one or more compounds of the following pyrimidine or pyridine compounds of the following formulae: 30 XXX-1 35 Foreignfiling_text P24-078 - 73 - 5 10 in which R1 have the meanings indicated in Formula II for R0and X0, respectively. R1preferably denotes alkyl having 1 to 6 C atoms. X0preferably denotes 15 F. The medium according to the invention particularly may optionally comprise one or more compounds of Formula XXX-1, in which X0preferably denotes F. The compounds of Formulae XXX-1 to XXX-3 may be employed in the LC media according to the invention in amounts of 1-20% by weight, particularly preferably 1-15% by weight. 20 Preferably, in addition to the compounds of Formulae I and LP1, Z3, Z3´, Z5, Z7`, Z9 or / and Z10, the LC medium contains one or more compounds of Formulae N1 and N2: 25 30 in which 35 R41and R42each, independently of one another, denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are Foreignfiling_text P24-078 - 74 - , 5 or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms may be replaced by a halogen atom, preferably R41denotes alkyl and R42denotes alkyl or alkoxy or 10 R41denotes alkenyl and R42denotes alkyl, wherein one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3- cyclopentylene, 1,3-cyclopentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, 15 20 also these independently of one another, denote 25 30 , 35 Foreignfiling_text P24-078 - 75 - 5,10 , preferably one or more of 15 20 and Z42, independently of one another and, if Z41occurs twice, also these independently of one another, denote -CH2CH2-, -COO-, trans- CH=CH-, trans-CF=CF-, -CH2O-, -CF2O-, -C≡C- or a single bond, 25 preferably one or more thereof denotes / denote a single bond, and p denotes 0, 1 or 2, preferably 0 or 1, and R51and R52, independently of one another, have one of the meanings given for 30 R41and R42and preferably denote alkyl having 1 to 12 C atoms, preferably n-alkyl, particularly preferably n-alkyl having 1 to 6 C atoms, alkoxy having 1 to 6 C atoms, preferably n-alkoxy, particularly preferably n-alkoxy having 2 to 6 C atoms, alkoxyalkyl, alkenyl or alkenyloxy having 2 to 6 C atoms, preferably having 2 to 35 4 C atoms, preferably alkenyloxy, Foreignfiling_text P24-078 - 76 - wherein one -CH2- group may be replaced by cyclopropylene, 1,3- cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, 5 , if present, each, independently of one another, denote 10 , 15 , 20 , preferably 25 30 35 denotes , Foreignfiling_text P24-078 - 77 - and, if present, 5preferably denotes ,Z51to Z53each, independently of one another, denote -CH2-CH2-, -CH2-O-, -CH=CH-, -C≡C-, -COO- or a single bond, preferably -CH2-CH2-, 10 -CH2-O- or a single bond and particularly preferably a single bond, i and j each, independently of one another, denote 0 or 1, (i + j) preferably denotes 0, 1 or 2, more preferably 0 or 1 and, most preferably, 1, and 15 wherein the one or more, preferably one, of the aromatic rings present may optionally be substituted by an alkyl group, preferably by methyl. In some embodiments, the compound of Formula N1 is represented by one of the 20 following formulae: 25 30 35 Foreignfiling_text P24-078 - 78 - 5 wherein "alkyl" and "alkyl*" each, independently from one another, denote an alkyl group 10 having 1 to 6 C atoms; "alkenyl" and "alkenyl*" each, independently of one another, denote an alkenyl group having 2 to 6 C atoms. 15 Very preferred are compounds of Formula Z1 and Z2. Particularly preferred compounds are those selected from the following subformulae: 20 25 30 35 Foreignfiling_text P24-078 - 79 - 5 10 15 20 25 30 HH35 Foreignfiling_text P24-078 - 80 - 5 In another preferred embodiment, the LC medium contains one or more compounds of Formula Z1 or its preferred subformulae and / or one or more compounds selected from 10 Formulae Z1, Z2, Z4, Z6, Z7 and Z8 or their preferred subformulae. Preferably, the total proportion of compounds of Formula Z1, Z2, Z4, Z6, Z7 and Z8 or their subformulae in the medium is from 10 wt.-% to 65 wt.-%, very preferably from 20 wt.-% to 60 wt.-%, most preferably from 25 wt.-% to 55 wt.-%. In yet a more preferred 15 embodiment, the compound of Formula Z1-1 is used in concentrations ranging from 10 wt.-% to 60 wt.-%, more preferably 25 wt.-% to 50 wt.-%, based on the total weight of the LC medium. In a further preferred embodiment, the LC medium comprises 50 wt.-% to 70 wt.-% of compounds represented by Formulae Z1-1 and Z4-2 in total. 20 Preferably, the medium contains 1, 2 or 3 compounds selected from Formulae Z1, Z2 and Z4 or their subformulae. The LC medium may additionally comprise one or more compounds of the following 25 general formulae: in which 30 R1and R2each, independently from one another, denote C1-6-alkyl, C1-6-alkoxy or C2-6-alkenyl.The compounds of Formula XII are preferably selected from the following subformulae: 35 Foreignfiling_text P24-078 - 81 - 5 10 wherein “alkyl” and “alkyl*” each, independently from one another, denote methyl, butyl, pentyl or hexyl. 15 Particular preference is given to the compounds of Formulae XIIa and XIIc. In Formula XIIb, "alkyl" preferably, independently of one another, denotes n-C3H7, n-C4H9or n-C5H11, in particular n-C3H7. In Formula XIIc, "alkyl" preferably denotes n-C3H7and "alkyl*" is preferably CH3or n-C3H7. 20 Particularly preferred compounds of Formula XII are described by the following structures: 25 30 The LC medium may additionally comprise one or more compounds selected from the following formulae: XIV 35 Foreignfiling_text P24-078 - 82 - 5 in which L1and L2have the meanings indicated in Formula LP1, and R1and R2each, independently of one another, denote n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms, and preferably each, independently of one another, 10 denote alkyl having 1 to 6 C atoms; in the compound of Formula XIV, at least one of the substituents R1and R2preferably denotes alkenyl having 2 to 6 C atoms. The LC medium may further optionally comprise one or more compounds of Formula XIV in which at least one of the substituents R1and R2denotes alkenyl having 2 to 6 15 C atoms, preferably those selected from the following subformulae: 20 25 30 35 in which "alkyl" and "alkyl*" have the meaning indicated above, and each, independently of one another, preferably denote methyl, ethyl or propyl. Foreignfiling_text P24-078 - 83 - The compounds of Formulae XIV are preferably selected from the following subformulae: 5 10 15 20 25 Very preferred are compounds of Formulae XIVd-1, XIVe-1, XIVe-2 and XIVe-3. The LC medium may further optionally comprise one or more compounds of Formula XV in which at least one of the substituents R1 denotes alkyl or alkoxy having 2 to 6 C atoms, preferably those selected from the following subformulae: 30 35 Foreignfiling_text P24-078 - 84 - in which "alkyl" has the meaning indicated above, and each, independently of one another, preferably denote methyl, ethyl or propyl. In yet a further embodiment, the LC medium comprises one or more compounds of 5 Formula XVI: 10 in which R1and R2have the meanings indicated in Formula I for R1, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H or F. 15 Particularly preferred compounds of Formula XVI are those of the subformulae: 20 25 30 35 Foreignfiling_text P24-078 - 85 - 5 in which “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, in particular ethyl, propyl or pentyl, and “alkenyl” and “alkenyl*” each, independently of one another, denote a straight-chain 10 alkenyl group having 2 to 6 C atoms, in particular CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH and CH3CH=CH.Particular preference is given to the compounds of Formulae XVIb and XVIc. Very 15 particular preference is given to the compounds of the following subformulae: 20 25 30 35 Foreignfiling_text P24-078 - 86 - 5 10 Very preferred are compounds of Formula XVIc-2. The LC medium may optionally comprise one or more compounds of the following for- 15 mulae: 20 25 30 in which R1and R2have the meanings indicated in Formula I for R1, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H or F. 35 Very preferred are compounds of Formula XVIIa, wherein L is H. Very preferred are compounds of Formula XVIIb, wherein L is F. Foreignfiling_text P24-078 - 87 - The LC medium may additionally comprise one or more compounds of the following formula: 5 in which L, R1and R2have the meanings indicated in Formula LP1 for L1, R0and R2, respectively. R1and R2preferably denote alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, 10 each having up to 6 C atoms. Particularly preferred compounds of Formula XXXII are those of the subformulae: 15 20 in which 25 “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, in particular ethyl, propyl or pentyl, and “alkenyl” denotes a straight-chain alkenyl group having 2 to 6 C atoms, in 30particular CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH andCH3CH=CH. Very particular preference is given to the compounds of the following subformulae: 35 XXXIIa-1 Foreignfiling_text P24-078 - 88 - 5 10 15 In some further embodiments, the LC medium comprises one or more compounds of 20 the following formulae: XXXV 25 in which R1and R2have the meanings indicated in Formula I for R0and R2, respectively, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. 30 Compounds of Formula ST In some preferred embodiments of the present invention, the LC medium may further comprise one or more additives being compounds of the general Formula ST: 35 Foreignfiling_text P24-078 - 89 - 5 in which the individual substituents have the following meanings: 10 X21, X22each, independently of one another, denote -O-, -CH2-, -CHR23- or15-N-R23- ;R21and R22each, independently of one another, denote a H atom or an alkyl- or alkoxy group having 1 to 12 C atoms, an alkenyl, alkinyl, alkenyloxy or alkoxyalkyl group having 2 to 12 C atoms or a cycloalkyl group having 3 to 12 C atoms, in which one or more non-adjacent CH2groups are optionally 20 ch a way that O atoms are not linked directly to one another, and in which one 25 or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms may be replaced by a halogen atom; R23denotes a H atom, an alkyl or alkoxy group having1 to 10 C atoms; 30 denotes 0 or 1. LC media comprising compounds of the following sub-formulae ST-1, ST-2 and ST-3 showed a particularly high long-term thermal and UV stability: 35 Foreignfiling_text P24-078 - 90 - 5 10 15 20 25 30 R21and R22each, independently of one another, denote a H atom or an alkyl or alkoxy group having 1 to 7 C atoms; and r denotes 0 or 1. 35 In particularly preferred embodiments, the compounds of the general Formula ST can be selected from the following specific structures: Foreignfiling_text P24-078 - 91 - ST-1-1 5 10 ST-1-2 15 ST-1-3 20 ST-1-4 25 ST-1-5 30 35 Foreignfiling_text P24-078 - 92 - Foreignfiling_text P24-078 - 93 - Foreignfiling_text P24-078 - 94 - 5 10 15 In a further preferred embodiment, the LC medium according to the present invention 20 may comprise at least one further sterically hindered phenol, which is mentioned in Table B below. Compounds of Formula H 25 The LC medium may optionally comprise one or more additives being compounds of Formula H 30 H in which 35 R11each, independently of one another, denotes a H atom, F, an alkyl group having 1 to 20 C atoms, in which one -CH2- group or, if present, a Foreignfiling_text P24-078 - 95 - plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or, if present, a plurality of -CH2- groups may be replaced by -CH=CH- or -C≡C-, and in which one H atom or a plurality of H atoms may be replaced by F, 5 OR13, N(R13)(R14) or R15;R12each, independently of one another, denotes a H atom, an alkyl group having 1 to 20 C atoms, in which one -CH2- group or a plurality of -CH2- 10groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2-groups cannot be replaced by -O-, a hydrocarbon group which contains a cycloalkyl or alkylcycloalkyl unit and in which one -CH2- group or a plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two 15 adjacent -CH2- groups cannot be replaced by -O-, and in which one H atom or a plurality of H atoms may be replaced by F, OR13, N(R13)(R14) or R15, or an aromatic or heteroaromatic hydrocarbon group, in which one H atom or a plurality of H atoms may be replaced by 20OR13, N(R13)(R14) or R15;R13and R14each, independently of one another, denotes an alkyl or acyl group having 1 to 10 C atoms or an aromatic hydrocarbon or carboxylic acid group having 6 to 12 C atoms; 25 R15each, independently of one another, denotes an alkyl group having 1 to 10 C atoms, in which one -CH2- group or a plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups 30 cannot be replaced by -O- ; R16each, independently of one another a H atom, an alkyl group or an alkoxy group having 1 to 10 C atoms, O-cycloalkyl group having 3 to 12 C atoms, O^or OH; 35 Foreignfiling_text P24-078 - 96 - each, independently of one another, denote an alkylene group having 1 to 20 C atoms, in which one -CH2- group or, if present, a plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and in which one H atom or a 5 plurality of H atoms may be replaced by F, or denote a single bond; Y11each, independently of one another, denote methyl or ethyl; 10 X11denotes C;Z11each, independently of one another, denote -O-, -(C=O)-, -O-(C=O)-, 15 -(C=O)-O-, -O-(C=O)-O-, -(N-R13)-, -N-R13-(C=O)- or a single bond if ,1and Z12do not simultaneously denote -O-; is a single bond, both Z13and Z14do not simultaneously denote -O-; and, if q denotes 0, both Z12and Z13do not simultaneously denote -O-; 20 p denotes 1 or 2; q denotes 0 or 1; o denotes (3-p); n denotes an integer from 1 to 10; 25 m denotes an integer from 0 to 8; wherein n*p denotes an integer from 1 to 10, preferably from 3 to 8; and denotes an organic moiety having (m+n) bonding sites, 30 In some preferred embodiments of the present invention, in the compounds of Formula H, 35 denotes , Foreignfiling_text P24-078 - 97 - 5 10 15 20 25 (trans-1,4-cyclohexylene) and / or 30 wherein -Z12-S11-Z11- on each occurrence, independently of one another, denotes -O-, S11-O-, -O-S11-O-, -(C=O)-O-S11-O-, -O-(C=O)-S11-O-, -O-(C=O)-S11-(C=O35 )-O-, -O-S11-(C=O)-O-, -(C=O)-O-S11-C, -(C=O)-O-S11-O-(C=O)- or -(N-R13) -S11-O-, -(N-R13-C(=O)-S11-(C=O)-O or a single bond, Foreignfiling_text P24-078 - 98 - preferably -O-, -S11-O-, -O-S11-O-, -(C=O)-O-S11-O-, -O-(C=O)-S11-O- or -O-S11-(C=O)-O-; and / or 1 preferably denotes an alkylene group having 1 to 20 C atoms; and / or 5 R11if present, denotes alkyl, alkoxy or H, preferably H or alkyl; and / or denotes H, methyl, ethyl, propyl, isopropyl or 3-heptyl, or cyclohexyl. In a preferred embodiment of the present application, in the compounds of Formula H, 10 denotes a group selected from the group of the formulae: 15 20 25 30 In a further preferred embodiment of the present application, in the compounds of Formula H, 35 denotes a group selected from the group of the formulae Foreignfiling_text P24-078 - 99 - , 5 10 . 15 In yet a further preferred embodiment of the present invention, in the compounds of Formula H in which p preferably denotes 1, 20 12 11 11 denotes Z S Z , preferably -O-S11-O-, -S11-O- or -O-S11-, particularly preferably -O-S11-O- or -S11-O-. 25 In a further preferred embodiment of the present invention, in the compounds of Formula H, the group 30 denotes a group selected from the group of the formulae 35 Foreignfiling_text P24-078 - 100 - 5 , 10 15 20 25 .In a further preferred embodiment of the present invention, in which p is 2, which may 30 be identical to or different from those described above, in the compounds of Formula H, 35 denotes a group selected from the group of the formulae Foreignfiling_text P24-078 - 101 - 5 10 15 20 25 . In yet a further preferred embodiment of the present invention, which may be identical to or different from those described above, in the compounds of Formula H, the group 30 , 35 on each occurrence, independently of one another, denotes Foreignfiling_text P24-078 - 102 - 5 10 15 Compounds of the following general Formulae H-1-1, H-1-2 and H-1-3, showed to be particularly efficient UV stabilisers in LC mixtures, in particular, in terms of VHR stability: 20 25 30 wherein ZG, R16and n are as defined above and n denotes an integer from 1 to 8. These compounds are highly suitable as stabilisers in LC mixtures and stabilise the VHR of the mixtures upon UV exposure. 35 Foreignfiling_text P24-078 - 103 - In a particularly preferred embodiment, the one or more compounds of Formula H may be selected from the group consisting of the compounds the following Formulae H-2-1 to H-2-6: 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 104 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 105 - 5 10 in which R11each, independently of one another, denotes an H atom, an alkyl group having 1 to 20 C atoms, in which one -CH2- group or, if present, a 15 plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or, if present, a plurality of -CH2- groups may be replaced by-CH=CH- or -C≡C-, and in which one H atom or a plurality of H atoms may be replaced by F, 20OR13, N(R13)(R14) or R15;R16denotes a H atom or O•; n denotes an integer from 0 to 12; and 25 each, independently of one another, denote an alkylene group having 1 to 20 C atoms, in which one -CH2- group or, if present, a plurality of -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent 30 -CH2- groups cannot be replaced by -O-, and in which one H atom or a plurality of H atoms may be replaced by F, OR13, N(R13)(R14) or R15,or denote a single bond. 35 In a preferred embodiment of the present invention, the LC media according to the invention comprise in each case one or more compounds of Formula H selected from the following group of the compounds of the formulae: Foreignfiling_text P24-078 - 106 - 35 Foreignfiling_text P24-078 - 107 - 30 35 Foreignfiling_text P24-078 - 108 - 35 Foreignfiling_text P24-078 - 109 - 5 10 15 O N 20 OOO O 25 O N O N O 30 35 Foreignfiling_text P24-078 - 110 - O N 5O OO O O O N O 10 O O O 15 N O O O 20 N OOO 25 O N O 30ONO O O 35 Foreignfiling_text P24-078 - 111 - O N O 5 O O O O 10 O N O O O O N O 15 O N O OOONO20 OOO 25 OO ONO O O 30 O N O 35 Foreignfiling_text P24-078 - 112 - O N O O 5 N O O O O O O O O O 10 O N O O O 15 O O N O O O N 20 O N O O O O 25 O O N O 30 35 Foreignfiling_text P24-078 - 113 - 5 10 15 20 25 30 and 35 Foreignfiling_text P24-078 - 114 - 5 10 Preferred content of the one or more compounds of Formula H in the LC medium depends inter alia on the inherent chemical stability of the LC medium as well as on the nature of the compound of Formula H. Compounds of Formula H in which R16denotes 15 O•, which are known as NO radical type HALS are preferably used in proportion ranging from 50 ppm to 1000 ppm, based on the weight of the LC medium. Compounds of Formula H in which R16denotes an H atom, which are known as NH radical type HALS are advantageously used in proportion ranging from 50 ppm to 20 2000 ppm, based on the weight of the LC medium. Further preferred LC media are selected from the following preferred embodiments, including any combination thereof: 25 ^ compounds of Formulae I, LP1 and LP2; ^ compounds of Formulae I, LP1 and LP2 in combination with a compound of Formula Z3, preferably Z3-3; ^ compounds of Formulae I, LP1 and LP2 in combination with a compound of Formula G, preferably G-1, more preferably G-1-1; 30 ^ compounds of Formulae I, LP1 and LP2 in combination with a compound of Formula U, preferably U-1, more preferably U-1-1; ^ compounds of Formulae I, LP1 and LP2 in combination with a compound of Formula II and / or III and a compound of Formula Z1 and Z4; 35 ^ one or more compounds of Formulae I, LP1 and LP2, II and / or III and one or more compounds selected from the group consisting of Formulae Z1, Z2, Z3, Z4, Z5, V, VI, VII, VIII, XIV, XV, XVI, XVIIa, XVIIb, XVIIc, XVIII, XIX, XX, XXI, XXIII, Foreignfiling_text P24-078 - 115 - XXIV, XXV, XXVI, XXVII, XXVIII, XXIX, XXX, XXX-1, XXX-2, XXX-3, XXXII, XXXIII and their subformulae; ^ one or more compounds selected from the group consisting of Formula III-1, III-4, III-6, III-16, III-19 and III-20, very preferably from the group consisting of Formula 5 III-1, III-6, III-16 and III-20. The individual concentration of each of these compounds is preferably from 2 to 15% by weight. The total concentration of these compounds is preferably from 5 to 40% by weight. ^ one or more compounds of Formula IV, preferably selected from Formula IVa or 10 IVc, very preferably from Formula IVa-1 or IVc-1, most preferably of Formula IVc- 1. The individual concentration of each of these compounds is preferably from 2 to 15% by weight. The total concentration of these compounds is preferably from 5 to 20% by weight. ^ one or more compounds of Formula VI, preferably selected from Formula VIb. 15 The individual concentration of each of these compounds is preferably from 1 to 20% by weight. The total concentration of these compounds is preferably from 5 to 20% by weight. ^ one or more compounds of Formula Z1, preferably selected from Formula Z1-1. 20 The total concentration of compounds of Formula Z1 is preferably from 1 to 60 % by weight, more preferably 5 to 50 % by weight. In particular, the concentration of compounds of Formula Z1-1 is preferably at least 15% by weight, more preferably at least 20% by weight, more preferably at least 30% by weight and not more than 60% by weight. 25 ^ one or more compounds of Formula Z2, preferably selected from Formulae Z2-1 and Z2-2. The total concentration of these compounds is preferably from 2 to 35%, very preferably from 3 to 25% by weight. ^ from 5 to 20% by weight of compounds of Formula Z3, preferably of Formula Z3- 30 1; ^ from 5 to 20% by weight of compounds of Formula Z4, preferably of Formula Z4- 1; ^ from 1 to 30%, very preferably from 2 to 20% by weight of compounds of Formula 35 Z5, preferably Z5-1; Foreignfiling_text P24-078 - 116 - ^ one or more compounds of Formula LP1-1, preferably of Formula LP1-1a or LP2- 1b, very preferably of Formula LP1-1a. The concentration of these compounds is preferably from 2 to 15% by weight. ^ from 1 to 15% by weight of compounds of Formula LP2-1b; 5 ^ one or more compounds of Formula XII, preferably of Formula XIIa or XIIb, very preferably of Formula XIIa, most preferably of Formula XIIa-1. The concentration of these compounds is preferably from 2 to 15% by weight. ^ from 1 to 15% by weight of compounds of Formula XIIb; 10 ^ one or more compounds of Formula XIV, preferably of Formula XIVd, very preferably of Formula XIVd-1. The concentration of these compounds is preferably from 2 to 10% by weight. ^ one or more compounds of Formula XVIb, preferably of Formula XVIb-1, XVIb-2 15 and / or XVIb-3. The concentration of these compounds is preferably from 2 to 15% by weight. ^ one or more compounds of Formula XVIc, preferably of Formula XVIc-1, XVIc-2 and / or XVIc-3. The concentration of these compounds is preferably from 2 to 20 20% by weight. ^ one or more compounds selected from the group consisting of Formulae XVIIa, XVIIb and XVIIc, very preferably of Formula XVIIa wherein L is H and of Formula XVIIb wherein L is F. The total concentration of these compounds is preferably from 0.5 to 5% by weight. 25 ^ one or more compounds of Formula XX, preferably of Formula XXa. The concentration of these compounds is preferably from 2 to 10% by weight. ^ one or more compounds of Formula XXI, preferably of Formula XXIa. The concentration of these compounds is preferably from 2 to 10% by weight. 30 ^ one or more compounds of Formula XXIII, preferably of Formula XXIIIa. The concentration of these compounds is preferably from 0.5 to 5% by weight. ^ one or more compounds of Formula XXIX, preferably of Formula XXIXa. The concentration of these compounds is preferably from 2 to 10% by weight. 35 ^ one or more compounds of Formula XXX. The concentration of these compounds is preferably from 2 to 10% by weight. Foreignfiling_text P24-078 - 117 - ^ one or more compounds of Formula XII, preferably of Formula XIIc. The concentration of these compounds is preferably from 2 to 10% by weight. ^ one or more compounds of Formula G, preferably of Formula G-1, LP1 and LP2, III, and one or more compounds selected from the group consisting of Formulae 5 Z1, Z2 and Z3 or their subformulae, ^ one or more compounds selected from the group consisting of Formula XIV, one or more compounds selected from the group consisting of Formulae IV, VI, XX, XXIII and XXIX or their subformulae, and one or more compounds selected from 10 the group consisting of Formulae LP2-1, XVI, XVIIa, XVIIb, XVIIc or their subformulae. ^ one or more compounds of Formula U, preferably of Formula U-1, LP1 and LP2, III, one or more compounds selected from the group consisting of Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae, one or more compounds selected from 15 the group consisting of Formula XIVd or their subformulae. ^ one or more compounds selected from the group consisting of Formulae IVc, VIb, XXa, XXIIIa and XXIXa or their subformulae, and one or more compounds selected from the group consisting of Formulae LP1-1b, XVIb, XVIc, XVIIa, XVIIb, 20 XVIIc or their subformulae. ^ one or more compounds of Formula G, preferably of Formulae G-1, LP1 and LP2, II and / or III, one or more compounds selected from the group consisting of Formulae Z1, Z2 and Z3 or their subformulae, one or more compounds of 25 Formula Y, preferably selected from the group consisting of Formulae Y1 and Y2, one or more compounds selected from the group consisting of Formula XIV, one or more compounds selected from the group consisting of Formulae III, IV, VI, XX, XXIII and XXIX or their subformulae, and one or more compounds selected from the group consisting of Formulae LP2-1, XVI, XVIIa, XVIIb, XVIIc or their 30 subformulae. ^ one or more compounds of Formula G, preferably of Formulae G-1, LP1 and LP2, one or more compounds selected from the group consisting of Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae, one or more compounds of Formula B, preferably selected from the group consisting of Formulae B1, B2 and B3, one or 35 more compounds of Formula XIVd or their subformulae, one or more compounds selected from the group consisting of Formulae III, IVc, VIb, XXa, XXIIIa and XXIXa or their subformulae, and one or more compounds selected from the Foreignfiling_text P24-078 - 118 - group consisting of Formulae LP1-1b, XVIb, XVIc, XVIIa, XVIIb, XVIIc or their subformulae. Besides the compounds of Formulae I and LP1, Z3, Z3´, Z5, Z7`, Z9 or Z10 the LC 5 medium may comprise further compounds selected from the group of the compounds of Formula Z1, Z2, Z3, IV, LP1-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subformulae. 10 Besides the compounds of Formulae I and LP1, Z3, Z3´, Z5, Z7`, Z9 or Z10, the LC medium preferably comprises further compounds selected from the group of the compounds of Formulae Z1, Z2, Z3, IV, LP2-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subformulae. 15 The proportion of compounds of Formula I in the LC medium is preferably from 1 to 30%, very preferably from 2 to 25%, most preferably from 2 to 20% by weight. 20 The total proportion of compounds of Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae in the LC medium as a whole is preferably from 10 to 65%, very preferably from 20 to 60% by weight. 25 The proportion of compounds of Formulae III, IV-VIII, XVIII-XXIII and XXVII-XXX in the LC medium as a whole is preferably from 30 to 60% by weight. The proportion of compounds of Formulae XIV and XV in the LC medium as a whole is 30 preferably from 40 to 70% by weight. The proportion of compounds of Formulae XIV, XVIIa-c and XXXII in the LC medium as a whole is preferably from 0.5 to 15% by weight. 35 The term "alkyl" or "alkyl*" in this application encompasses straight-chain and branched alkyl groups having 1 to 6 carbon atoms, in particular the straight-chain groups methyl, Foreignfiling_text P24-078 - 119 - ethyl, propyl, butyl, pentyl and hexyl. Groups having 2 to 5 carbon atoms are generally preferred. The term "alkenyl" or “alkenyl*” encompasses straight-chain and branched alkenyl 5 groups having 2 to 6 carbon atoms, in particular the straight-chain groups. Preferred alkenyl groups are C2-C7-1E-alkenyl, C4-C6-3E-alkenyl, in particular C2-C6-1E- alkenyl. Examples of particularly preferred alkenyl groups are vinyl, 1E-propenyl, 1E-butenyl, 1E-pentenyl, 1E-hexenyl, 3-butenyl, 3E-pentenyl, 3E-hexenyl, 4-pentenyl, 4Z-hexenyl, 4E-hexenyl and 5-hexenyl. Groups having up to 5 carbon atoms are 10 generally preferred, in particular CH2=CH, CH3CH=CH. The term "fluoroalkyl" preferably encompasses straight-chain groups having a terminal fluorine, i.e. fluoromethyl, 2-fluoroethyl, 3-fluoropropyl, 4-fluorobutyl, 5-fluoropentyl, 15 6-fluorohexyl and 7-fluoroheptyl. However, other positions of the fluorine are not excluded. The term "oxaalkyl" or "alkoxy" preferably encompasses straight-chain groups of Formula CnH2n+1-O-(CH2)m, in which n and m each, independently of one another, 20 denote 1 to 6. m may also denote 0. Preferably, n = 1 and m = 1 to 6 or m = 0 and n = 1 to 3. Further preferably the alkoxy or oxaalkyl group can also contain one or more further O atoms such that oxygen atoms are not directly linked to one another. Through a suitable choice of the meanings of in Formulae II and III, the 25 addressing times, the threshold voltage, the steepness of the transmission characteris- tic lines, etc., can be modified in the desired manner. For example, 1E-alkenyl groups, 3E-alkenyl groups, 2E-alkenyloxy groups and the like generally result in shorter addressing times, improved nematic tendencies and a higher ratio between the elastic 30 constants K3(bend) and (splay) compared with alkyl and alkoxy groups.4-Alkenyl groups, 3-alkenyl groups and the like generally give lower threshold voltages and lower values of K3 / K 1compared with alkyl and alkoxy groups. The LC media according to the invention are distinguished, in particular, by high ^^ values and thus have significantly faster response times than the LC media from the prior art. 35 Foreignfiling_text P24-078 - 120 - The optimum mixing ratio of the compounds of the above-mentioned formulae depends substantially on the desired properties, on the choice of the components of the above- mentioned formulae and on the choice of any further components that may be present. 5 Suitable mixing ratios within the range indicated above can easily be determined from case to case. The total amount of compounds of the above-mentioned formulae in the LC media according to the invention is not crucial. The LC media can therefore comprise one or 10 more further components for the purposes of optimisation of various properties. However, the observed effect on the desired improvement in the properties of the medium is generally greater, the higher the total concentration of compounds of the above-mentioned formulae. 15 In a particularly preferred embodiment, the LC media according to the invention comprise compounds of Formulae IV to VIII (preferably IV and V) in which denotes F, OCF3, OCHF2, OCH=CF2, OCF=CF2or OCF2-CF2H.20 The individual compounds of the above-mentioned formulae and the subformulae thereof which can be used in the LC media according to the invention are either known or can be prepared analogously to the known compounds. The invention also relates to a process for the preparation of a LC medium as 25 described above and below, by mixing one or more compounds of Formulae I with or more compounds selected from the group consisting of Formulae LP1, Z3, Z3´, Z5, Z7´and Z9. The LC medium of the present invention may optionally comprise one or more 30 polymerisable compounds. The polymerisable compounds are preferably selected from Formula M Ra-B1-(Zb-B2)m-RbM35 in which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meaning: Foreignfiling_text P24-078 - 121 - Raand RbP, P-Sp-, H, F, Cl, Br, I, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, SF5or straight-chain or branched alkyl having 1 to 25 C atoms, in which, in addition, one or more non-adjacent CH2groups may each be replaced, independently of one another, by -C(R0)=C -, -O-, 5 -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- in such a way that O and / or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, Br, I, CN, P or P-Sp-, where, if B1and / or B2contain a saturated C atom, Raand / or Rbmay 10 also denote a group which is spiro-linked to this saturated C atom; wherein at least one of the substituents Raand Rbdenotes or contains a group P or P-Sp-; 15 P a polymerisable group; Sp a spacer group or a single bond; B1and B2an aromatic, heteroaromatic, alicyclic or heterocyclic group, preferably having 4 to 25 ring atoms, which may also contain fused rings, and 20 which is unsubstituted, or mono- or polysubstituted by L; Zb-O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-, -OCH2-, -CH2O-, -SCH2-, -CH2S-, -CF2O-, -OCF2-, -CF2S-, -SCF2-, -(CH2)n1-, -CF2CH2-,-CH2CF2-, -(CF ) -, -CH=CH-, -CF=CF-, -C^C-, -CH=CH-COO-, 252 n1 single bond; R0and R00each, independently of one another, denote H or alkyl having 1 to 12 C atoms; 30 m denotes 0, 1, 2, 3 or 4; n1 denotes 1, 2, 3 or 4; L P, P-Sp-, OH, CH2OH, F, Cl, Br, I, -CN, -NO2, -NCO, -NCS, -OCN, 35 -SCN, -C(=O)N(Rx)2, -C(=O)Y1, -C(=O)Rx, -N(Rx)2, optionally substituted silyl, optionally substituted aryl having 6 to 20 C atoms, or Foreignfiling_text P24-078 - 122 - straight-chain or branched alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy having 1 to 25 C atoms, in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-; 5 P and Sp have the meanings indicated in Formula M above; denotes halogen; Rxdenotes P, P-Sp-, H, halogen, straight-chain, branched or cyclic alkyl having 1 to 25 C atoms, in which, in addition, one or more non-adjacent CH2groups may be replaced by -O-, -S-, -CO-, -CO-O-, -O-CO-, 10 -O-CO-O- in such a way that O and / or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, P or P-Sp-, an optionally substituted aryl or aryloxy group having 6 to 40 C atoms, or an optionally substituted heteroaryl or 15 heteroaryloxy group having 2 to 40 C atoms. Further preferably, the LC media according to the present invention comprise one or more polymerisable compounds selected from Table H below. 20 Preferably, the proportion of polymerisable compounds in the LC medium, preferably selected from Formula M and Table H, is from 0.01 to 5%, very preferably from 0.05 to 1%, most preferably from 0.1 to 0.5%. It was observed that the addition of one or more polymerisable compounds to the LC 25 medium, like those selected from Formula M and Table H, leads to advantageous properties like fast response times. Such a LC medium is especially suitable for use in PSA displays where it shows low image sticking, a quick and complete polymerisation, the quick generation of a low pretilt angle which is stable after UV exposure, a high reliability, high VHR value after UV exposure, and a high birefringence. By appropriate 30 selection of the polymerisable compounds it is possible to increase the absorption of the LC medium at longer UV wavelengths, so that it is possible to use such longer UV wavelengths for polymerisation, which is advantageous for the display manufacturing process. 35 The polymerisable group P is a group which is suitable for a polymerisation reaction, such as, for example, free-radical or ionic chain polymerisation, polyaddition or Foreignfiling_text P24-078 - 123 - polycondensation, or for a polymer-analogous reaction, for example addition or condensation onto a main polymer chain. Particular preference is given to groups for chain polymerisation, in particular those containing a C=C double bond or -C^C- triple bond, and groups which are suitable for polymerisation with ring opening, such as, for 5 example, oxetane or epoxide groups. Preferred groups P are selected from the group consisting of CH2=CW1-CO-O-, 10 15 20 25 , , , , having 1 to 5 C atoms, Phe denotes 1,4-phenylene, which is optionally substituted by one or more substituents L as defined for Formula M above which are other than 30 P-Sp-, k1, k2and k3each, independently of one another, denote 0 or 1, k3preferably denotes 1, and k4denotes an integer from 1 to 10. 35 Foreignfiling_text P24-078 - 124 - Very preferred groups P are selected from the group consisting of CH2=CW1-CO-O-, 5 10 , , , , , , 15 atoms, in particular H, F, Cl or CH3, W2and W3each, independently of one another, denote H or alkyl having 1 to 5 C atoms, in particular H, methyl, ethyl or n-propyl, W4, W5and W6each, independently of one another, denote Cl, oxaalkyl or oxacarbonylalkyl having 1 to 5 C atoms, W7and W8each, independently of one another, denote H, Cl or 20 alkyl having 1 to 5 C atoms, Phe denotes 1,4-phenylene, k1, k2and k3each, independently of one another, denote 0 or 1, k3preferably denotes 1, and k4denotes an integer from 1 to 10. Very particularly preferred groups P are selected from the group consisting of 25 CH2=CW1-CO-O-, in particular CH2=CH-CO-O-, CH2=C(CH3)-CO-O- and CH2=CF-CO-O-, furthermore CH2=CH-O-, (CH2=CH)2CH-O-CO-, (CH2=CH)2CH-O-, 30 . Further preferred polymerisable groups P are selected from the group consisting of vinyloxy, acrylate, methacrylate, fluoroacrylate, chloroacrylate, oxetane and epoxide, 35 most preferably from acrylate and methacrylate. Foreignfiling_text P24-078 - 125 - If Sp is different from a single bond, it is preferably of Formula Sp"-X", so that the respective substituent P-Sp- conforms to Formula P-Sp"-X"-, wherein Sp" denotes alkylene having 1 to 20, preferably 1 to 12, C atoms, which is optionally 5 mono- or polysubstituted by F, Cl, Br, I or CN and in which, in addition, one or more non-adjacent CH2groups may each be replaced, independently of one another, by -O-, -S-, -NH-, -N(R0)-, -Si(R0R00)-, -CO-, -CO-O-, -O-CO-, 10 -N(R0)-CO-N(R00)-, -CH=CH- or -C^C- in such a way that O and / or S atoms are not linked directly to one another, X" denotes -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CO-N(R0)-, -N(R0)-CO-, -N(R0)-CO-N(R00)-, -OCH2-, -CH2O-, -SCH2-, -CH2S-, -CF2O-, -OCF2-, 15 -CF2S-, -SCF2-, -CF2CH2-, -CH2CF2-, -CF2CF2-, -CH=N-, -N=CH-, -N=N-, single bond, 20 R0and R00each, independently of one another, denote H or alkyl having 1 to 20 C atoms, and Y2and Y3each, independently of one another, denote H, F, Cl or CN. 25 X" is preferably -O-, -S-, -CO-, -COO-, -OCO-, -O-COO-, -CO-NR0-, -NR0-CO-, -NR0- CO-NR00- or a single bond. Typical spacer groups Sp and -Sp"-X"- are, for example, -(CH2)p1-, 30 -(CH2CH2O)q1-CH2CH2-, -CH2CH2-S-CH2CH2-, -CH2CH2-NH-CH2CH2- or-(SiR0R00-O)p1-, in which p1 is an integer from 1 to 12, q1 is an integer from 1 to 3, and R0and R00have the meanings indicated in Formula M above. 35 Particularly preferred groups Sp and -Sp”-X”- are -(CH2)p1-, -(CH2)p1-O-, Foreignfiling_text P24-078 - 126 - -(CH2)p1-O-CO-, -(CH2)p1-CO-O-, -(CH2)p1-O-CO-O-, in which p1 and q1 have themeanings indicated above. Particularly preferred groups Sp" are, in each case straight-chain, ethylene, propylene, 5 butylene, pentylene, hexylene, heptylene, octylene, nonylene, decylene, undecylene, dodecylene, octadecylene, ethyleneoxyethylene, methyleneoxybutylene, ethylenethioethylene, ethylene-N-methyliminoethylene, 1-methylalkylene, ethenylene, propenylene and butenylene. 10 For the production of PSA displays, the polymerisable compounds contained in the LC medium are polymerised or crosslinked (if one compound contains two or more poly- merisable groups) by in-situ polymerisation in the LC medium between the substrates of the LC display, optionally while a voltage is applied to the electrodes. 15 The structure of the PSA displays according to the invention corresponds to the usual geometry for PSA displays, as described in the prior art cited at the outset. Geometries without protrusions are preferred, in particular those in which, in addition, the electrode on the colour filter side is unstructured and only the electrode on the TFT side has 20 slots. Particularly suitable and preferred electrode structures for PS-VA displays are described, for example, in US 2006 / 0066793 A1. The combination of compounds of the preferred embodiments mentioned above with the polymerised compounds described above causes low threshold voltages, low 25 rotational viscosities and very good low-temperature stabilities in the LC media according to the invention at the same time as constantly high clearing points and high VHR values. The use of LC media containing polymerisable compounds allows the rapid 30 establishment of a particularly low pretilt angle in PSA displays. In particular, the LC media exhibit significantly shortened response times, in particular also the grey-shade response times, in PSA displays compared with the media from the prior art. Preference is generally given to LC media which have a nematic LC phase, and 35 preferably have no chiral liquid crystal phase. Foreignfiling_text P24-078 - 127 - The invention also relates to the use of a LC medium according to the present invention as described above and below for electro-optical purposes, in particular for the use is in shutter glasses, for 3D applications, in TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, positive VA and positive PS-VA 5 displays, and to electro-optical displays, in particular of the aforementioned types, containing a LC medium according to the present invention as described above and below, in particular a TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB- FFS, PS-FFS, positive VA (vertically aligned) or positive PS-VA display. 10 The invention also relates to electro-optical displays, such as, for example, STN or matrix LC (MLC) displays, having two plane-parallel outer plates, which, together with a frame, form a cell, integrated non-linear elements for switching individual pixels on the outer plates, and a nematic LC medium having positive dielectric anisotropy and high specific resistance located in the cell, wherein the nematic LC medium is a LC medium 15 according to the present invention as described above and below. The LC media according to the invention enable a significant broadening of the available parameter latitude. The achievable combinations of clearing point, viscosity at low temperature, thermal and UV stability and high optical anisotropy are far superior to 20 previous materials from the prior art. In particular, the combination of compounds of Formula I with compounds of Formulae LP1, Z3, Z3´, Z5, Z7´and Z9 and, optionally, with compounds selected from Formulae 25 III-XXXII or their subformulae, leads to LC media which show a moderate positive dielectric anisotropy and at the same time an increased dielectric constant ^^perpen- dicular to the longitudinal axes of the LC molecules, while maintaining a low rotational viscosity and a low value of the ratio ^^ / K^. This enables energy efficient LC displays, especially of the FFS, HB-FFS, XB-FFS and IPS mode, with high brightness and 30 transmission and low response times. The LC media according to the invention are suitable for mobile applications and TFT applications, such as, for example, mobile telephones and PDAs. Furthermore, the LC 35 media according to the invention are particularly suitably for use in FFS, HB-FFS, XB- FFS and IPS displays based on dielectrically positive liquid crystals. Foreignfiling_text P24-078 - 128 - The LC media according to the invention, while retaining the nematic phase down to -20 °C and preferably down to -30 °C, particularly preferably down to -40 °C, and the clearing point ^ 75 °C, preferably ^ 80 °C, at the same time allow rotational viscosities ^^of ^ 120 mPa ^ s, particularly preferably ^ 100 mPa ^ s, to be achieved, enabling 5 excellent MLC displays having fast response times to be achieved. The rotational viscosities are determined at 20 °C. The dielectric anisotropy ^^ of the LC media according to the invention at 20 °C and 1 kHz is preferably ^ +1.5, very preferably from +3 to +18, most preferred from +5 to +15. 10 The birefringence ^n of the LC media according to the invention at 20°C is preferably from 0.08 to 0.2, very preferably from 0.09 to 0.15. 15 The rotational viscosity ^^of the LC media according to the invention is preferably ^ 120 mPa.s, more preferably ^ 110 mPa.s, very preferably ^ 90 mPa.s. The ratio ^^^ / K^(wherein ^^is the rotational viscosity and K^is the elastic constant for splay deformation) of the LC media according to the invention is preferably 20 ^ 7 mPa.s / pN, very preferably ^ 6 mPa.s / pN, most preferably ^ 5.5 mPa.s / pN. The average elasticity constant ratio Kavof the LC media according to the invention is preferably at least 14.0 pN, very preferably at least 15.0 pN, most preferably at 25 least 16.0 pN. Kavcan be calculated according to the following formula: Kav= (K1+ K2+ K3) / 3 ≈ (K1+ ½ * K1+ K3) / 3.The nematic phase range of the LC media according to the invention preferably has a 30 width of at least 90 °C, more preferably of at least 100 °C, in particular at least 110 °C. This range preferably extends at least from -25 °C to +90 °C. It goes without saying that, through a suitable choice of the components of the LC media according to the invention, it is also possible for higher clearing points (for 35 example above 100 °C) to be achieved at higher threshold voltages or lower clearing points to be achieved at lower threshold voltages with retention of the other advantageous properties. At viscosities correspondingly increased only slightly, it is Foreignfiling_text P24-078 - 129 - likewise possible to obtain LC media having a higher ^^ and thus low thresholds. The MLC displays according to the invention preferably operate at the first Gooch and Tarry transmission minimum [C.H. Gooch and H.A. Tarry, Electron. Lett.10, 2-4, 1974; C.H. Gooch and H.A. Tarry, Appl. Phys., Vol.8, 1575-1584, 1975], where, besides 5 particularly favourable electro-optical properties, such as, for example, high steepness of the characteristic line and low angle dependence of the contrast (German patent 3022818), lower dielectric anisotropy is sufficient at the same threshold voltage as in an analogous display at the second minimum. This enables significantly higher specific resistance values to be achieved using the LC media according to the invention at the 10 first minimum than in the case of LC media comprising cyano compounds. Through a suitable choice of the individual components and their proportions by weight, the person skilled in the art is able to set the birefringence necessary for a pre-specified layer thickness of the MLC display using simple routine methods. 15 Measurements of the voltage holding ratio (HR) [S. Matsumoto et al., Liquid Crystals 5, 1320 (1989); K. Niwa et al., Proc. SID Conference, San Francisco, June 1984, p. 304 (1984); G. Weber et al., Liquid Crystals 5, 1381 (1989)] have shown that LC media according to the invention comprising compounds of Formulae ST-1, ST-2, RV, 20 IA and IB exhibit a significantly smaller decrease in the HR on UV exposure than analogous LC media comprising cyanophenylcyclohexanes of Formula or esters of Formula . 25 The light stability and UV stability of the LC media according to the invention are considerably better, i.e. they exhibit a significantly smaller decrease in the HR on exposure to light, heat or UV. 30 The construction of the MLC display according to the invention from polarisers, electrode base plates and surface-treated electrodes corresponds to the usual design for displays of this type. The term usual design is broadly drawn here and also encompasses all derivatives and modifications of the MLC display, in particular including matrix display elements based on poly-Si TFTs or MIM. 35 Foreignfiling_text P24-078 - 130 - A significant difference between the displays according to the invention and the hitherto conventional displays based on the twisted nematic cell consists, however, in the choice of the LC parameters of the LC layer. 5 The LC media which can be used in accordance with the invention are prepared in a manner conventional per se, for example by mixing one or more compounds of Claim 1 with one or more compounds of Formulae LP2 and II-XXXII or with further LC com- pounds and / or additives. In general, the desired amount of the components used in lesser amount is dissolved in the components making up the principal constituent, 10 advantageously at elevated temperature. It is also possible to mix solutions of the components in an organic solvent, for example in acetone, chloroform or methanol, and to remove the solvent again, for example by distillation, after thorough mixing. The LC media may also comprise further additives known to the person skilled in the 15 art and described in the literature, such as, for example, polymerisation initiators, inhibitors, surface-active substances, light stabilisers, antioxidants, e.g. BHT, TEMPOL, microparticles, free-radical scavengers, nanoparticles, etc. For example, 0 to 15% of pleochroic dyes or chiral dopants or initiators like Irgacure® 651 or Irgacure® 907 can be added. Suitable stabilisers and dopants are mentioned below in Tables F and G. In 20 a preferred embodiment, the LC medium comprises one or more stabilisers selected from Table G. Preferably, the proportion of stabilisers, like those of Formula ST and H, as described above or listed in Table G, in the LC medium is from 10 to 2000 ppm, very preferably from 30 to 1000 ppm. 25 Furthermore, it is possible to add to the LC media, for example, 0 to 15% by weight of pleochroic dyes, furthermore nanoparticles, conductive salts, preferably ethyldimethyldodecylammonium 4-hexoxybenzoate, tetrabutylammonium tetraphenylborate or complex salts of crown ethers (cf., for example, Haller et al., Mol. 30 Cryst. Liq. Cryst.24, 249-258 (1973)), for improving the conductivity, or substances for modifying the dielectric anisotropy, the viscosity and / or the alignment of the nematic phases. Substances of this type are described, for example, in DE-A 2209127, 2240864, 2321632, 2338281, 2450088, 2637430 and 2853728. 35 For the present invention and in the following examples, the structures of the LC compounds are indicated by means of acronyms, with the transformation into chemical formulae taking place in accordance with Tables A to C below. All substituents Foreignfiling_text P24-078 - 131 - CmH2m+1, CnH2n+1, and ClH2l+1or CmH2m-1, CnH2n-1and ClH2l-1are straight-chain alkyl groups or alkylene groups, in each case having n, m and l C atoms respectively. Preferably, n, m and l are independently of each other 1, 2, 3, 4, 5, 6, or 7. Table A shows the codes for the ring elements of the nuclei of the compound, Table B 5 lists the bridging units, and Table C lists the meanings of the symbols for the left- and right-hand end groups of the molecules. The acronyms are composed of the codes for the ring elements with optional linking groups, followed by a first hyphen and the codes for the left-hand end group, and a second hyphen and the codes for the right-hand end group. Table D shows illustrative structures of compounds together with their 10 respective abbreviations. Table A: Ring elements 15 20 25 30 35 Foreignfiling_text P24-078 - 132 - Y 5 P(F, Cl)Y 10 np 15 n3f th 20 tH2f 25 o2f 30 dh 35 B Foreignfiling_text P24-078 - 133 - 5 10 15 20 25 30 T E-CH2-CH2- V -CH=CH- T -C≡C- 35W -CF2-CF2- B -CF=CF- Z -CO-O- -O-CO- Foreignfiling_text P24-078 - 134 - X -CF=CH- XI -CH=CF- O -CH2-O- OI -O-CH2- Q -CF2-O- QI -O-CF2- 5 Table C: End groups On the left individually or in combi- On the right individually or in com- nation bination 10 -nO- CnH2n+1-O- -On -O-CnH2n+1-V- CH2=CH- -V -CH=CH2-nV- CnH2n+1-CH=CH- -nV -CnH2n-CH=CH2-Vn- CH2=CH-CnH2n- -Vn -CH=CH-CnH2n+115 -nVm- CnH2n+1-CH=CH- -nVm -CnH2n-CH=CH-CmH2m- CmH2m+1-N-N≡C--N-C≡N-S- S=C=N- -S -N=C=S 20 -F- F- -F -F -CL- Cl- -CL -Cl -M- CFH2- -M -CFH2-D- CF2H- -D -CF2H 25-T- CF3- -T -CF3-MO- CFH2O - -OM -OCFH2-DO- CF2HO - -OD -OCF2H -TO- CF3O- -OT -OCF330-A-H-C≡C--A-C≡C-H -nA- CnH2n+1-C≡C- -An -C≡C-CnH2n+1-NA-N≡C-C≡C--AN-C≡C-C≡N -(cn)- -(cn) 3 Foreignfiling_text P24-078 - 135 - On the left only in combination On the right only in combination -…n…- -CnH2n- -…n… -CnH2n- -…M…- -CFH- -…M… -CFH- 5 -…D…- -CF2- -…D… -CF2- -…V…- -CH=CH- -…V… -CH=CH- -…Z…- -CO-O- -…Z… -CO-O- -…ZI…- -O-CO- -…ZI… -O-CO- -…K…- -CO- -…K… -CO- 10 -…W…- -CF=CF- -…W… -CF=CF- in which n and m are each integers, and the three dots "…" are placeholders for other abbreviations from this table. 15 The following abbreviations are used: n, m, k and l are, independently of one another, each an integer 1 to 12, preferably 1 to 6, k and l possibly may be also 0 and preferably are 0 to 4, more preferably 0 or 2 and most preferably 2, n preferably is 1, 2, 3, 4 or 5, in the combination “-nO-” it preferably 20 is 1, 2, 3 or 4, preferably 2 or 4, m preferably is 1, 2, 3, 4 or 5, in the combination “-Om” it preferably is 1, 2, 3 or 4, more preferably 2 or 4. The combination “-lVm” preferably is “2V1”. Preferred components of the LC medium are shown in Tables D and E. 25 Table D 30 35 MEnF.F MEnm Foreignfiling_text P24-078 - 136 - 5 10 15 20 25 30 HP-nF 35 Foreignfiling_text P24-078 - 137 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 138 - 5 10 15 20 25 30 35 CFU Foreignfiling_text P24-078 - 139 - Table E In the following formulae, n and m each, independently of one another, denote 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, in particular 2, 3, 5, furthermore 0, 4, 6. 5 10 15 20 25 30 35 ECCP-nm CCZU-n-F Foreignfiling_text P24-078 - 140 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 141 - CDU-n-F DCU-n-F 5 10 15 20 25 30 35 CCQU-n-F CC-n-Vm Foreignfiling_text P24-078 - 142 - 5 10 15 20 25 30 35 Dec-U-n-F CWCU-n-F Foreignfiling_text P24-078 - 143 - 5 10 15 20 25 30 35 CCGU-n-F CCQG-n-F Foreignfiling_text P24-078 - 144 - 5 10 15 20 25 30 PYP-nF 35 Foreignfiling_text P24-078 - 145 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 146 - DLGU-n-m 5 10 15 20 25 30 35 PGUQU-n-F Foreignfiling_text P24-078 - 147 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 148 - PCH-nCl GP-n-Cl 5 10 15 20 25 30 35 PUS-n-Om PGS-n-Om Foreignfiling_text P24-078 - 149 - 5 10 15 20 25 30 35 APUQU-n-F(1) Foreignfiling_text P24-078 - 150 - 5 10 15 20 25 30 35 PYP-n-m Foreignfiling_text P24-078 - 151 - Particular preference is given to LC media which, besides the compounds of Formulae I and Formulae LP1, Z3, Z3´, Z5, Z7´and / or Z9 comprise at least one, two, three, four or more compounds from Table E. 5 Table F Table F indicates possible dopants which are generally added to the LC media according to the invention. The LC media preferably comprise 0-10% by weight, in 10 particular 0.01-5% by weight and particularly preferably 0.01-3% by weight of dopants. 15 20 25 30 35 Foreignfiling_text P24-078 - 152 - 5 10 15 R / S-1011 20 Table G Stabilisers, which can additionally be added, for example, to the LC media according to the invention in amounts of 0 to 10% by weight, are mentioned below. 25 30 35 n = 1, 2, 3, 4, 5, 6 or 7 Foreignfiling_text P24-078 - 153 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 154 - Foreignfiling_text P24-078 - 155 - O O O OH 5 N N 10 N OHN OH N Cl N 15 20 H O N N N 25 N O N N O H O 30 35 Foreignfiling_text P24-078 - 156 - 5 NNOH 10 N O OH O 15 20 25 . O N O O 30 O O . O ON OO ON 35 Foreignfiling_text P24-078 - 157 - 5 q = 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 Table H 10 Table H shows illustrative reactive mesogenic compounds (RMs) which can be used in the LC media in accordance with the present invention. 15 20 25 30 RM-5 RM-6 35 Foreignfiling_text P24-078 - 158 - 5 10 15 20 25 30 RM-15 RM-16 35 Foreignfiling_text P24-078 - 159 - 5 10 15 20 25 30 RM-25 RM-26 35 Foreignfiling_text P24-078 - 160 - 5 10 15 20 25 30 RM-35 RM-36 35 Foreignfiling_text P24-078 - 161 - 5 10 15 20 25 30 RM-45 RM-46 35 Foreignfiling_text P24-078 - 162 - 5 10 15 20 25 30 35 RM-52 RM-53 Foreignfiling_text P24-078 - 163 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 164 - 5 10 15 20 25 30 35 RM-74 RM-75 Foreignfiling_text P24-078 - 165 - O 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 166 - Foreignfiling_text P24-078 - 167 - 5 10 15 20 25 30 RM-101 35 Foreignfiling_text P24-078 - 168 - 5 10 15 20 25 30 35 RM-105 RM-106 Foreignfiling_text P24-078 - 169 - RM-113 RM-114 Foreignfiling_text P24-078 - 170 - Foreignfiling_text P24-078 - 171 - O O O O O O O 5 RM-123 O O O 10 O O O O O 15 RM-125 O O O 20 O O O O O O O 25 RM-127 O 30OO F O O O O 35 O RM-129 RM-130 Foreignfiling_text P24-078 - 172 - 5 10 15 20 25 30 RM-137 RM-138 35 Foreignfiling_text P24-078 - 173 - RM-147 RM-148 Foreignfiling_text P24-078 - 174 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 175 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 176 - Foreignfiling_text P24-078 - 177 - 5 10 15 RM-183 RM-184 20 The LC media according to the invention may optionally comprise one or more polymerizable compounds, preferably selected from the polymerizable compounds of Formulae RM-1 to RM-184. Of these, compounds RM-1, RM-4, RM-8, RM-17, RM-19, RM-35, RM-37, RM-39, RM-40, RM-41, RM-48, RM-52, RM-54, RM-57, RM-58, RM- 25 64, RM-74, RM-76, RM-88, RM-91, RM-102, RM-103, RM-109, RM-116, RM-117, RM- 120, RM-121, RM-122, RM-139, RM-140, RM-142, RM-143, RM-145, RM-146, RM- 147, RM-149, RM-156 to RM-163, RM-169, RM-170 and RM-171 to RM-184 are par- ticularly preferred. 30 Table I Table I shows self-alignment additives for vertical alignment which can be used in LC media for SA-FFS, SA-HB-FFS and SA-XB-FFS displays according to the present 35 invention: Foreignfiling_text P24-078 - 178 - Foreignfiling_text P24-078 - 179 - 35 Foreignfiling_text P24-078 - 180 - 35 Foreignfiling_text P24-078 - 181 - O O O 5 O SA-17 O O 10 O O SA-18 15 O O O O 20 O C5H11 OSA-19 O 25 O O O 30 C5H11O SA-20 O 35 O Foreignfiling_text P24-078 - 182 - 5 10 15 F 20 25 30 35 Foreignfiling_text P24-078 - 183 - F 5 10 F 15 20 F 25 30 35 Foreignfiling_text P24-078 - 184 - 5 F 10 15 20 25 F 30 35 Foreignfiling_text P24-078 - 185 - O O O O 30 35 Foreignfiling_text P24-078 - 186 - F 5 10 15 20 F 25 F 30 35 Foreignfiling_text P24-078 - 187 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 188 - 5 10 15 20 25 30 35 Foreignfiling_text P24-078 - 189 - 5 10 In a preferred embodiment, the LC media, SA-VA and SA-FFS displays according to the present invention comprise one or more SA additives selected from Formulae SA-1 to SA-49, preferably from Formulae SA-14 to SA-49, very preferably from Formulae 15 SA-20 to SA-34 and SA-44, in combination with one or more RMs. The following examples are intended to explain the invention without limiting it. Above and below, percentage data denote per cent by weight. All temperatures are 20 indicated in degrees Celsius. m.p. denotes melting point, cl.p. = clearing point. Furthermore, C = crystalline state, N = nematic phase, S = smectic phase and I = isotropic phase. The data between these symbols represent the transition temperatures. Furthermore, the following symbols are used 25 V0Freedericks threshold voltage, capacitive [V] at 20°C, V10voltage [V] for 10% transmission, neextraordinary refractive index measured at 20°C and 589 nm, n0ordinary refractive index measured at 20°C and 589 nm, 30 ^n optical anisotropy measured at 20°C and 589 nm, ^^dielectric susceptibility (or "dielectric constant") perpendicular to the to the longitudinal axes of the molecules at 20°C and 1 kHz, ^^^dielectric susceptibility (or "dielectric constant") parallel to the to the 35 longitudinal axes of the molecules at 20 °C and 1 kHz, ^^ dielectric anisotropy at 20 °C and 1 kHz, cl.p. or Foreignfiling_text P24-078 - 190 - T(N,I) clearing point [°C], ^ flow viscosity measured at 20 °C [ ^ rotational viscosity measured at 20 °C [mPa^s], K1elastic constant, "splay" deformation at 20 °C [pN], 5 K2elastic constant, "twist" deformation at 20 °C [pN], K3elastic constant, "bend" deformation at 20 °C [pN], and VHR voltage holding ratio. 10 All physical properties are determined in accordance with "Merck Liquid Crystals, Physical Properties of Liquid Crystals", status Nov.1997, Merck KGaA, Germany, and apply for a temperature of 20°C, unless explicitly indicated otherwise. 15 20 25 30 35 Foreignfiling_text P24-078 - 191 - Examples Example M1 A nematic LC medium is formulated as follows: 5 10 15 20 25 30 The LC mixture has Kavof 17.03 pN and ^1 of 3.54 mPa^s / pN. 35 Mixture Example S1 (stabilised with compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Foreignfiling_text P24-078 - 192 - 5 Addition of 500 ppm of the compound of Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M1, without affecting the remaining physical properties of the mixture M1. 10 15 Example M2 20 A nematic LC medium is formulated as follows: 25 30 35 Foreignfiling_text P24-078 - 193 - 5 10 The LC mixture has Kavof 17.43 pN and ^1 of 3.56 mPa^s / pN. 15 Mixture Example S2 (stabilised with compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: 20 25 Addition of 1000 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M2, without affecting the remaining physical properties of the mixture. 30 35 Foreignfiling_text P24-078 - 194 - Example M3 A nematic LC medium is formulated as follows: 5 10 15 20 25 30 The LC mixture has Kavof 17.57 pN and ^1 of 3.67 mPa^s / pN. Mixture Example S3 (stabilised with compound of Formula ST-2-3) 35 A nematic LC mixture according to the invention is formulated as follows: Foreignfiling_text P24-078 - 195 - 5 Addition of 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M3, without affecting the remaining physical properties of the mixture. 10 15 Example M4 20 A nematic LC medium is formulated as follows: 25 30 35 Foreignfiling_text P24-078 - 196 - 5 10 The LC mixture has Kavof 16.05 pN and ^1 of 5.19 mPa^s / pN. Mixture Example S4 (stabilised with compound of Formula H-3-1) 15 A nematic LC mixture according to the invention is formulated as follows: 20 Addition of 1000 ppm of the compound of Formula H-3-1 significantly improves the 25 VHR100after UV exposure compared to the non-stabilized mixture M4, without affecting the remaining physical properties of the mixture. 30 35 Foreignfiling_text P24-078 - 197 - Example M5 A nematic LC medium is formulated as follows: 5 10 15 20 25 30 The LC mixture has Kavof 17.63 pN and ^1 of 3.50 mPa^s / pN. Mixture Example S5 (stabilised with compound of Formula H-3-5) 35 A nematic LC mixture according to the invention is formulated as follows: Foreignfiling_text P24-078 - 198 - 5 Addition of 50 ppm of the compound of the Formula H-3-5 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M5, without affecting the remaining physical properties. 10 15 Example M6 20 A nematic LC medium is formulated as follows: 25 30 35 Foreignfiling_text P24-078 - 199 - 5 10 The LC mixture has Kavof 16.92 pN and ^1 / of 3.36 mPa^s / pN. Mixture Example S6 (stabilised with compound of Formula H-3-3) 15 A nematic LC mixture according to the invention is formulated as follows: 20 Addition of 1000 ppm of the compound of the Formula H-3-3 significantly improves the 25 VHR100after UV exposure compared to the non-stabilized mixture M6, without affecting the remaining physical properties. 30 35 Foreignfiling_text P24-078 - 200 - Example M7 A nematic LC medium is formulated as follows: 5 10 15 20 25 30 The LC mixture has Kavof 17.72 pN and ^1 of 3.48 mPa^s / pN. Mixture Example S7 (stabilised with compound of Formula H-3-6) 35 A nematic LC mixture according to the invention is formulated as follows: Foreignfiling_text P24-078 - 201 - 5 Addition of 50 ppm of the compound of the Formula H-3-6 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M7, without affecting the remaining physical properties of the mixture. 10 15 20 Example M8 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 202 - 5 10 15 The LC mixture has Kavof 17.72 pN and ^1 of 3.48 mPa^s / pN. 20 Mixture Example S8 (stabilised with compounds of Formulae ST-2-3 and H-3-3) A nematic LC mixture according to the invention is formulated as follows: 25 30 Addition of 150 ppm of the compound of the Formula H-3-3 and 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M8, without affecting the remaining physical properties of the mixture. 35 Foreignfiling_text P24-078 - 203 - Example M9 A nematic LC medium is formulated as follows: 5 10 15 20 25 30 35 The LC mixture has Kavof 17.30 pN and ^1 / K1of 3.69 mPa^s / pN. Foreignfiling_text P24-078 - 204 - Mixture Example S9 (stabilised with compound of Formula H-3-2) A nematic LC mixture according to the invention is formulated as follows: 5 10 Addition of 50 ppm of the compound of the Formula H-3-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M9, without affecting the remaining physical properties of the mixture. 15 20 Example M10 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 205 - 5 10 15 20 The LC mixture has Kavof 17.55 pN and ^1 of 3.69 mPa^s / pN. Mixture Example S10 (stabilised with compound of Formula H-3-4) 25 A nematic LC mixture according to the invention is formulated as follows: 30 Addition of 100 ppm of the compound of the Formula H-3-4 significantly improves the 35 VHR100after UV exposure compared to the non-stabilized mixture M10, without affecting the remaining physical properties of the mixture. Foreignfiling_text P24-078 - 206 - 5 Example M11 10 A nematic LC medium is formulated as follows: 15 20 25 30 35 Foreignfiling_text P24-078 - 207 - The LC mixture has Kavof 17.70 pN and ^1 of 3.64 mPa^s / pN. Mixture Example S11 (stabilised with compound of Formula H-3-7) 5 A nematic LC mixture according to the invention is formulated as follows: 10 Addition of 500 ppm of the compound of Formula H-3-7 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M11, without 15 affecting the remaining physical properties of the mixture. 20 25 Example M12 30 A nematic LC medium is formulated as follows: 35 Foreignfiling_text P24-078 - 208 - 5 10 15 20 25 30 The LC mixture has Kavof 16.78 pN and ^1 of 3.82 mPa^s / pN. Mixture Example S12 (stabilised with compound of Formula H-3-8) A nematic LC mixture according to the invention is formulated as follows: 35 Foreignfiling_text P24-078 - 209 - Addition of 500 ppm of the compound of Formula H-3-8 significantly improves the 5 VHR100after UV exposure compared to the non-stabilized mixture M12, without affecting the remaining physical properties of the mixture. 10 15 20 Example M13 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 210 - 5 10 15 20 The LC mixture has Kavof 16.25 pN and ^1 of 3.92 mPa^s / pN. 25 Mixture Example S13 (stabilised with compound of Formula H-3-9) A nematic LC mixture according to the invention is formulated as follows: 30 35 Foreignfiling_text P24-078 - 211 - Addition of 50 ppm of the compound of the Formula H-3-9 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M13, without affecting the remaining physical properties of the mixture. 5 10 15 20 Example M14 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 212 - 5 10 15 20 The LC mixture has Kavof 16.73 pN and ^1 of 3.92 mPa^s / pN. 25 Mixture Example S14 (stabilised with compound of Formula H-3-10) A nematic LC mixture according to the invention is formulated as follows: 30 35 Foreignfiling_text P24-078 - 213 - Addition of 50 ppm of the compound of the Formula H-3-10 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M14, without affecting the remaining physical properties of the mixture. 5 10 15 20 Example M15 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 214 - 5 10 15 20 The LC mixture has Kavof 16.57 pN and ^1 of 3.87 mPa^s / pN. 25 Mixture Example S15 (stabilised with compound of Formula H-3-11) A nematic LC mixture according to the invention is formulated as follows: 30 35 Foreignfiling_text P24-078 - 215 - Addition of 50 ppm of the compound of the Formula H-3-11 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M15, without affecting the remaining physical properties of the mixture. 5 10 15 20 Example M16 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 216 - 5 10 15 20 The LC mixture has Kavof 16.80 pN and ^1 of 3.92 mPa^s / pN. 25 Mixture Example S16 (stabilised with compound of Formula H-3-12) A nematic LC mixture according to the invention is formulated as follows: 30 35 Foreignfiling_text P24-078 - 217 - Addition of 50 ppm of the compound of the Formula H-3-12 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M16, without affecting the remaining physical properties of the mixture. 5 10 15 20 Example M17 25 A nematic LC medium is formulated as follows: 30 35 Foreignfiling_text P24-078 - 218 - 5 10 15 20 The LC mixture has Kavof 17.00 pN and ^1 of 3.80 mPa^s / pN. 25 Mixture Example S17 (stabilised with compound of Formula H-3-13) A nematic LC mixture according to the invention is formulated as follows: 30 35 Foreignfiling_text P24-078 - 219 - Addition of 50 ppm of the compound of the Formula H-3-13 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M17, without affecting the remaining physical properties of the mixture. 5 10 15 20 Example M18 A nematic LC medium is formulated as follows: 25 30 35 Foreignfiling_text P24-078 - 220 - 5 10 15 20 The LC mixture has Kavof 17.22 pN and ^1 of 3.72 mPa^s / pN. Mixture Example S18 (stabilised with compound of Formula H-3-14) A nematic LC mixture according to the invention is formulated as follows: 25 30 Addition of 50 ppm of the compound of the Formula H-3-14 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M18, without affecting the remaining physical properties of the mixture. 35 Foreignfiling_text P24-078 - 221 - 5 10 15 Example M19 20 A nematic LC medium is formulated as follows: 25 30 35 Foreignfiling_text P24-078 - 222 - 5 10 15 The LC mixture has Kavof 16.68 pN and ^1 of 3.83 mPa^s / pN. Mixture Example S19 (stabilised with compound of Formula ST-1-3) 20 A nematic LC mixture according to the invention is formulated as follows: 25 Addition of 500 ppm of the compound of the Formula ST-1-3 significantly improves the 30 VHR100after UV exposure compared to the non-stabilized mixture M19, without affecting the remaining physical properties of the mixture. Example M20 35 A nematic LC medium is formulated as follows: Foreignfiling_text P24-078 - 223 - 5 10 15 20 25 30 The LC mixture has Kavof 17.17 pN and ^1 of 3.82 mPa^s / pN. Mixture Example S20 (stabilised with compound of Formula ST-1-3) 35 A nematic LC mixture according to the invention is formulated as follows: Foreignfiling_text P24-078 - 224 - 5 Addition of 400 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M20, without affecting the remaining physical properties of the mixture. 10 Example M21 A nematic LC medium is formulated as follows: 15 20 25 30 35 Foreignfiling_text P24-078 - 225 - 5 10 The LC mixture has Kavof 17.00 pN and ^1 of 3.77 mPa^s / pN. Mixture Example S21 (stabilised with compound of Formula ST-1-3) 15 A nematic LC mixture according to the invention is formulated as follows: 20 Addition of 400 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M21, without 25 affecting the remaining physical properties of the mixture. Example M22 30 A nematic LC medium is formulated as follows: 35 Foreignfiling_text P24-078 - 226 - 5 10 15 20 25 The LC mixture has Kavof 17.23 pN and ^1 of 3.82 mPa^s / pN. Mixture Example S22 (stabilised with compound of Formula H-3-1) 30 A nematic LC mixture according to the invention is formulated as follows: 35 Foreignfiling_text P24-078 - 227 - Addition of 1000 ppm of the compound of Formula H-3-1 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M22, without affecting the remaining physical properties of the mixture. 5 Example M23 A nematic LC medium is formulated as follows: 10 15 20 25 30 35 Foreignfiling_text P24-078 - 228 - 5 The LC mixture has Kavof 17.43 pN and ^1 / of 3.70 mPa^s / pN. Mixture Example S23 (stabilised with compound of Formula H-3-1) 10 A nematic LC mixture according to the invention is formulated as follows: 15 Addition of 700 ppm of the compound of Formula H-3-1 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M23, without 20 affecting the remaining physical properties of the mixture. 25 30 35

Claims

Foreignfiling_text P24-078 - 229 - Patent Claims 1. Liquid-crystalline medium characterised in that it comprises one or more compounds of Formula I 5I in which the individual substituents have the following meanings: 10 A1denotes phenylene-1,4-diyl, in which, in addition, one or two CH groups may be replaced by N and one or more H atoms may be replaced by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2or OCF3, cyclohexane-1,4-diyl, in which, in addition, one or two 15 non-adjacent CH2groups may be replaced, independently of one another, by O and / or S and one or more H atoms may be replaced by F, cyclohexene-1,4-diyl, bicyclo[1.1.1]pentane-1,3-diyl, bicyclo- [2.2.2]octane-1,4-diyl, spiro[3.3]heptane-2,6-diyl, tetrahydropyran- 20 2,5-diyl or 1,3-dioxane-2,5-diyl; R1each, independently of one another, denote a H atom, a halogen atom, -CN, -SCN, -NCS, an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C 25 atoms in which one or more non-adjacent CH2groups are optionally substituted, , , , -O-, -CO-O- 30 or -O-CO- in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by a halogen atom or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms, in which one or more H atoms may be replaced by a 35 halogen atom; X1denotes a halogen atom, preferably a F atom, CN, SCN, NCS;Foreignfiling_text P24-078 - 230 - denotes a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non- adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, 5 -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; Z1denotes -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, 10-C2H4-, -C2F4-, -CF2CH2-, -CH2CF2-, -CFHCFH-, -CFHCH2-,-CH2CFH-, -CF2CFH-, -CFHCF2-, -CH=CH-, -CF=CH-, -CH=CF-, -CF=CF-, -C^C- or a single bond; and k denotes 0, 1, 2 or 3; and 15 one or more compounds selected from the following: 20in which the individual substituents have the following meanings: 25 R0and R2each, independently of one another, denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, 30ms are not linked directly to one another, and in which one or more H 35 atoms may be replaced by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms;Foreignfiling_text P24-078 - 231 - L1and L2each, independently of one another, denote H, F or Cl; Y0denotes a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non- 5 adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; and 10 m denotes 0 or 1; 15 20 25 3035 wherein "alkyl" denotes an alkyl group having 1 to 6 C atoms;Foreignfiling_text P24-078 - 232 - "alkenyl" and "alkenyl*" each, independently of one another, denote an alkenyl group having 2 to 6 C atoms. 5 2. Medium according to Claim 1, characterised in that the compound of Formula I is selected from the group consisting of the following compounds: 10 15 20 25 30 35Foreignfiling_text P24-078 - 233 - 5 10 15 20 2530 in which R1,are as defined in Claim 1.

3. Medium according to Claim 1, further comprising one or more compounds of Formula LP2 35Foreignfiling_text P24-078 - 234 -5 in which the individual substituents have the following meanings: R0denotes an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted 10such a way that O atoms are not linked directly to one another, 15 and in which one or more H atoms may be replaced by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms; L1and L2each, independently of one another, denote H, F or Cl; 20 Y0denotes a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non- adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF -, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O 252atoms are not linked directly to one another; X0denotes a halogen atom, CN, SCN, NCS or an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group 30 having 2 to 6 C atoms in which one or more H atoms are replaced by a F atom; and n denotes 0 or 1. 35 4. Liquid-crystalline medium according to Claim 1 or 3, characterized in that the one or more compounds of Formulae LP1 and LP2 are described by Formulae LP1-1 and LP2-1:Foreignfiling_text P24-078 - 235 - 5in which R0and R2an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl 10 group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-,, , , , , 15 -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; and X0a F atom or an alkyl or an alkoxy group having 1 to 3 C atoms or an alkenyl or an alkenyloxy group having 2 or 3 C atoms in which 20 one or more H atoms are replaced by a F atom.

5. Medium according to one or more of Claims 1 to 4, characterized in that it further comprises one or more compounds of Formula G 25and / or one or more compounds of Formula U 3035 in which the individual substituents have the following meanings:Foreignfiling_text P24-078 - 236 - R1, R2each, independently of one another, denote a H atom, R4and R5an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 to 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, 5that O atoms are not linked directly to one another, or a cycloalkyl or a 10 cycloalkoxy group having 3 to 12 C atoms; Y1and Y2each, independently of one another, denote a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C 15 atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked directly to one another; 20 A1to A4each, independently of one another, denote phenylene-1,4-diyl, in which, in addition, one or two CH groups may be replaced by N and one or more H atoms may be replaced by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2or OCF3, cyclohexane-1,4-diyl, 25 in which, in addition, one or two non-adjacent CH2groups may be replaced, independently of one another, by O and / or S and one or more H atoms may be replaced by F, cyclohexene-1,4-diyl, bicyclo[1.1.1]pentane-1,3-diyl, bicyclo[2.2.2]octane-1,4-diyl, spiro- 30 [3.3]heptane-2,6-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5- diyl; Z1to Z4each, independently of one another, denote -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2H4-, -C2F4-, -CF2CH2-,35 -CH2CF2-, -CFHCFH-, -CFHCH2-, -CH2CFH-, -CF2CFH-,Foreignfiling_text P24-078 - 237 - -CFHCF2-, -CH=CH-, -CF=CH-, -CH=CF-, -CF=CF-, -C^C- or a single bond; k, l, m and n each, independently of one another, denote 0, 1, 2 or 3. 5 6. Medium according to one or more of Claims 1 to 5, characterized in that it comprises one or more compounds selected from the group consisting of the following formulae: 10 II 15 III20 in which the individual substituents have the following meanings: 25 3035Foreignfiling_text P24-078 - 238 - 5 10R0has one of the meanings given in Claim 1 for R1; 15 X0has one of the meanings given in Claim 1L1to L6each, independently of one another, denote H, F or Cl; 20each, independently of one another, denote a H atom, an alkyl group having 1 to 3 C atoms or an alkenyl group having 2 to 3 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O- or -O-CO- in such a way that O atoms are not linked 25 directly to one another.

7. Medium according to Claim 6, wherein the one or more compounds of Formula III are selected from the following subformulae: 3035Foreignfiling_text P24-078 - 239 - 5 10 15 20 25 30 35Foreignfiling_text P24-078 - 240 - 5 10 15 20 25 3035Foreignfiling_text P24-078 - 241 - 5 10 15 20 25 30 35Foreignfiling_text P24-078 - 242 -5 in which R0andhave the meanings given in Formula III.

8. Medium according to one or more of Claims 1 to 7, characterised in that it additionally comprises one or more compounds selected from the group 10 consisting of the following formulae: 15 20 25 3035Foreignfiling_text P24-078 - 243 - 5in which R0, X0, L1, L2have the meanings given in Claim 6; L3and L4each, independently of one another, have the meanings given for 10Z0denotes -C2H4-, -(CH2)4-, -CH=CH-, -CF=CF-, -C2F4-, -CH2CF2- , -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-, or -OCF2-, in 15 Formulae V and VI also a single bond; and s denotes 0 or 1. 20 9. Medium according to one or more of Claims 1 to 8, characterised in that it comprises one or more compounds selected from group consisting of the following formulae: 25 30 35Foreignfiling_text P24-078 - 244 - 5in which the individual substituents have the following meanings: 10 "alkyl" and "alkyl*" each, independently from one another, denote an alkyl group having 1 to 6 C atoms; 15 "alkenyl" and "alkenyl*" each, independently of one another, denote an alkenyl group having 2 to 6 C atoms.

10. Medium according to one or more of Claims 1 to 9, characterised in that it comprises one or more compounds selected from the group consisting of the 20 following formulae: 25 30 35Foreignfiling_text P24-078 - 245 -5 in which R1and R2each, independently of one another, denote alkyl, alkoxy, oxaalkyl or fluoroalkyl, each having 1 to 6 C atoms or alkenyl having 2 to 6 C atoms; and 10 L1denotes H, F or Cl.

11. Medium according to one or more of Claims 1 to 10, characterised in that it 15 comprises one or more compounds selected from the group consisting of the following formulae 20 25 3035Foreignfiling_text P24-078 - 246 - 5 10 15in which R0,each, independently of one another, have one of the meanings indicated in Claim 6. 20 12. Medium according to one or more of Claims 1 to 11, characterized in that it comprises one or more compounds selected from the group consisting of the following formulae: 25 3035Foreignfiling_text P24-078 - 247 - 510 in which 1520 R1and X0have the meanings indicated in Claims 6 for R0and X0, respectively.

13. Medium according to one or more of Claims 1 to 12, characterized in that it comprises from 20 wt.-% to 80 wt.-%, preferably from 30 wt.-% to 70 wt.-%, more preferably from 40 wt.-% to 60 wt.-% of a compound of Formula Z1-1 2514. Medium according to one or more of Claims 1 to 13, characterized in that it 30 comprises a compound of Formula Z1-1 and a compound of Formula Z4-2 35Foreignfiling_text P24-078 - 248 - 15. Medium according to one or more of Claims 1 to 14, characterized in that it additionally comprises one or more additives. 5 16. Process for the preparation of a liquid-crystalline medium according to one or more of Claims 1 to 15, characterised in that one or more compounds of Formula I and one or more compounds of Formulae LP1, Z3, Z3´, Z5, Z7´and Z9 are mixed with one or more mesogenic compounds and optionally one or more polymerizable compounds and / or one or more additives. 10 17. Use of a liquid-crystalline medium according to one or more of Claims 1 to 15 for electro-optical purposes.

18. Electro-optical liquid-crystal display or an AR / VR headset containing a liquid- 15 crystalline medium according to one or more of Claims 1 to 15.

19. Electro-optical liquid-crystal display according to Claim 18, characterized in that it is a TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-HB-FFS, PS-XB-FFS, SA-HB-FFS, SA-XB-FS, polymer stabilised SA-HB- 20 FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA display.

20. Electro-optical liquid-crystal display according to Claim 18, characterized in that it is an FFS, HB-FFS, XB-FFS, PS-HB-FFS, PS-XB-FFS, IPS or PS-IPS display. 25 30 35

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