Liquid-crystalline medium

Abstract

The present invention relates to liquid-crystalline (LC) media or LC materials and to energy saving liquid-crystal displays (LCDs) containing these media, 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] Liquid-crystalline medium The present invention relates to liquid-crystalline (LC) media and to energy saving liquid-crystal displays (LCDs) containing these media, especially to high contrast gaming displays and AR / VR headsets. In particular, it relates 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. 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 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 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 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 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 electrodes and for addressing an IPS display. DE 19824137 likewise describes various embodiments of such IPS displays. LC 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, 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 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. LCDs 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 ani- sotropy are used in FFS displays, but in some cases LC media having a 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 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. 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 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 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 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 modern FFS and IPS applications. In addition, modern applications also require good low-temperature stability and fast addressing times. Until now, it was not possible to design suitable LC media having a high contrast ratio e.g. high elastic K1and 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. The present invention has the object of providing LC media, in particular for energy saving gaming FFS and IPS displays and AR / VR headsets, but also for TN, positive 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 and a low rotational viscosity and a relatively low birefringence ^n. Additionally, they need to have a high specific resistance, low 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. Surprisingly, the above technical problem was solved by providing LC media as described and claimed hereinafter. Prior art, for example WO 2010 / 099853 A1 and DE 102010027099 A1, discloses thiophene-containing LC media. WO 2010 / 099853 A1 teaches compounds containing a thiophene-2,5-diyl unit which is linked directly to a 2- and / or 6-substituted 1,4- phenylene unit. WO 2010 / 099853 A1 describes the development of novel materials for use in LC displays. This object was achieved by the provision of compounds of the following general formula comprising a 2,6-difluoro-1,4-phenylene unit adjacent to the thiophene moiety: and A2, besides other meanings, denote a 1,4-phenylene or 1,4- cyclohexylene unit, Z1and Z2denote a bridging element or a single bond. WO 2009 / 129915 A1 describes compounds of the following general formula comprising a 2-fluoro-1,4-phenylene unit adjacent to the thiophene moiety: 2 as well as nematic LC media comprising the same. However, the LC media of the prior art still require a further improvement in terms of a sufficiently high average elastic constant Kavin combination with a low response time parameter ^1 / K1. It has now been surprisingly found that LC media according to the present invention which contain one or more compounds of the Formula L L in combination with and one or more compounds of Formula S S 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 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 superior motion picture quality and an improved overall image quality, in particular a high contrast. The present invention relates to a LC medium, characterised in that it comprises one or more compounds of Formula L L and one or more compounds of Formula S S in which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meanings: A0, A1, A2each, independently of one another, denote phenylene-1,4-diyl, in which, in addition, one or two CH groups may be substituted by N and one or more H atoms may be substituted by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2or OCF3, cyclohexane-1,4-diyl, in which, in addi- tion, one or two non-adjacent CH2groups may be substituted, independently of one another, by O and / or S and one or more H atoms may be substituted 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, tetra- hydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; R1, R2, each, independently of one another, denote a H atom, a halogen R3and R4atom, -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 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; L1and L2each, independently of one another, denote H, F or Cl, wherein L1and L2do not simultaneously denote H; and 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 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, preferably H or CH3;Z1and Z2each, independently of one another, denote -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; k and l each, independently of one another, denote 0, 1, 2 or 3. The LC media according to the present invention are especially suitable for use in energy saving LC displays of the FFS, HB-FFS, XB-FFS and IPS mode for gaming based on dielectrically positive LC media, and polymer stabilised variants thereof. 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 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, 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 may optionally include their isotopes. In some embodiments, 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. In the Formulae L and S, if R1, R2, R3and R4denote 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, R2, R3and R4preferably denote straight-chain alkyl having 1 to 6 C atoms or an alkenyl group having 2 to 6 C atoms. 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. If R1, R2, R3or R4denotes 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, R2, R3or R4are selected from orC2-12-alkenylene S2is H, C1-12-alkyl or C2-12-alkenyl, and very preferably one ,-OCH2OCH3, -O(CH2)2OCH3, -O(CH2)3OCH3,-O(CH2)4OCH3, -O(CH2)2F, -O(CH2)3F, -O(CH2)4F. If R1, R2, R3or R4denotes 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 particu- lar, 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-enyl. If R1, R2, R3or R4denotes 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 substituent may be in any desired position, but is preferably in the ^-position. Particularly preferred groups R1, R2, R3or R4denotes 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. Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, 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, heptynyl and octynyl. Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, n-octoxy. Halogen preferably denotes F or Cl, F being mostly preferred. Compounds of Formula L The one or more compounds of the Formula L is preferably selected from one of the following structures: 1 2 3 in which in which R1, R2and Y1have the meanings indicated in general Formula L. In one preferred embodiment, are as follows: R1and R2each, independently of one another, denote an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be substituted by a halogen atom; and Y1H or CH3. In yet another preferred embodiment, R1, R2and Y1are as follows: R1denotes an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, , -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 substituted by a halogen atom; and R2is X0, wherein 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 Y1H or CH3. Particularly preferred compounds of Formula L-2 and 3 are those selected from the group consisting of the following subformulae: Particularly preferred compounds of Formula L-1 may be selected from one of the following: Very preferred are the compounds of formulae L-2-1, L-2-2, L-2-3 and L-2-4, mostly preferred is the compound formula L-2-2. The proportion of the compounds of Formula L or its subformulae in the LC medium is preferably from 2 to 35%, very preferably from 3 to 30%, most preferably from 4 to 20% by weight. Preferably, the LC medium contains 1, 2 or 3 compounds of Formula L or its subformulae. Compounds of Formula S Preference is given to LC media comprising the compounds of Formula S in denotes phenylene-1,4-diyl, in which, in addition, one or two CH groups may be substituted by N and one or more H atoms may be substituted by halogen, CN, CH3, CHF2, CH2F, OCH3, OCHF2, CF3or OCF3. Particularly preferred are compounds in more ; and very particularly preferably in which A0 .The preferred compounds of the Formula S result in LC media having a particularly high clearing point, low rotational viscosity, a broad nematic phase range, high birefringence and an excellent thermal and UV stability. Preference is furthermore given to compounds of the Formula S in which k and l denote 0, 1 or 2, particularly preferably 0 or 1. Particular preference is given to compounds of the Formula S in which l denotes 0, i.e. the thiophene ring is a terminal ring. Preference is furthermore given to compounds of the Formula S in which k denotes 0, 1 or 2, preferably 1 or 2 and very particularly preferably 1. A0, A1and A2in Formula S particularly preferably denote phenylene-1,4-diyl, which may also be mono- or polysubstituted by F, furthermore cyclohexane-1,4-diyl, cyclo- hexenylene-1,4-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl. Z1and Z2in Formula S particularly preferably denote -CF2O-, -OCF2- or a single bond, wherein a single bond is particularly preferred. and A2in Formula S particularly preferably denote , preferably unsubstituted 1,4-phenylene, in which L denotes halogen, CF3or CN, preferably F. Preference is furthermore given to compounds of the Formula S in which R3and R4each, independently of one another, denote H, F, Cl, Br, -CN, -SCN, -NCS, SF5, halogen, or 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. Particularly preferred groups R3and R4in Formula S 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 group is not H, particularly preferably both groups R3and R4are not H. R3is very particularly preferably equal to alkyl. R4is furthermore preferably H, alkyl, alkyl which is substituted by at least one fluorine or fluorine. Very particularly preferably, R3is alkyl and R4is H or alkyl. R3, R4each, independently of one another, very particularly preferably denote unbranched alkyl having 1 to 5 C atoms. If R3and R4denote substituted alkyl, alkoxy, alkenyl or alkynyl, the total number of C atoms in the two groups R3and R4is preferably less than 10. Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, 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, heptynyl and octynyl. Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, n-octoxy. Halogen preferably denotes F or Cl, F being mostly preferred. Particularly preferred compounds of the Formula S are those selected from the following sub-formulae: 1 2 3 4 1 5 6 in which Y2, Y3, R3and R4and L3to L8have the meanings indicated in general Formula S. In a preferred embodiment, R3an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-, , -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 substituted by a halogen atom; R4a halogen atom, -CN, -SCN, -NCS, an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyloxy or an alkenyl group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, , O atoms are not linked directly to one another, and in which one or more H atoms may be substituted by a halogen atom; each, independently from one another, denote a H atom or a methyl group, preferably a H atom; and L3to L8each, independently from one another, denote a H atom, F or Cl. R3and R4may denote optionally fluorinated alkyl or alkoxy having 1 to 12 C atoms, optionally fluorinated alkenyl or alkynyl having 2 to 12 C atoms, optionally fluorinated cycloalkyl having 3 to 12 C atoms. Y2and Y3are preferably a H atom or a methyl group. Particularly preferred are optionally fluorinated alkyl, alkenyl or alkynyl having up to 5 C atoms. L3in the Formulae S-1-1 to S-1-6 preferably denotes F. In the Formulae S-1-4 to S-1-6, L5to L8preferably denote H. In a particularly preferred embodiment, the compounds of Formula S are selected from the following structures: 1 where R3has the same meaning as in the general Formula S; denotes a straight-chain or branched alkyl or alkoxy group having 1 to 6 C atoms, or an akenyl, alkenyloxy, alkoxyalkyl group having 2 to 6 C atoms, or a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms, in which one or more non-adjacent CH2groups are optionally substituted in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be substituted by a halogen atom; alternatively, is X0, wherein 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 L3and L4both denote a F atom or, alternatively, L3denotes a F atom and L4denotes a H atom; and each, independently from one another, denote a H atom or a straight- chain or branched alkyl group having 1 to 3 C atoms. LC media according to the present invention having a particularly advantageous properties are obtainable with the following compounds of the general Formula S: 1 2 3 wherein Y2, Y3, R3and R4are as defined above. In one preferred embodiment of the present invention, the LC medium comprises one or more compound of Formula S-2-4 and / or one or more compound of Formula S-2-7. In yet a further preferred embodiment, LC media comprise the following compounds of Formula S: 1 2 3 4 5 6 7 8 9 wherein n and m each, independently of one another, denote 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12. Mostly preferred compounds of Formula S include, in particular, one or more of the following: 1 1 2 3 4 5 6 7 8 9 As a further possibility, the following compounds of Formula S can be used: 1 2 3 4 5 6 7 8 9 As a further possibility, the following compounds of Formula S can be used: 1 2 3 4 5 6 7 5 1 2 3 4 5 Very preferred are the compounds of formulae S-3-9-2 and S-3-5-1. The proportion of the compounds of Formula S or its subformulae in the LC medium is preferably from 1 to 40%, very preferably from 2 to 30%, most preferably from 3 to 20% by weight. Preferably, the LC medium contains 1, 2 or 3 compounds of Formula S or its subformulae. Further components In a typical embodiment, the LC medium may additionally comprise one or more compounds selected from the following Formulae II and III: II III wherein the individual substituents, independently of each other and on each occurrence identically or differently, have the following meanings: R0has one of the meanings given for R1and R2in Formula L, X0independently of one another F, Cl, an alkyl group, an alkenyl group, an alkoxy group or an alkenyloxy group having up to 6 C atoms, in which one or more H atoms has been substituted by a halogen atom, L1-8independently of one another H, F or Cl, and has one of the meanings given Y1in Formula L. Preferred compounds of the Formula II and III are those Y0is H. Further preferred compounds of the Formula II and III are those wherein R0denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or preferably denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. In a preferred embodiment, the LC medium comprises one or more compounds of the Formula II selected from the following subformulae: 1 2 3 4 5 6 7 in have the meanings given in the Formula II. Preferred compounds are those of the Formula II-1, II-2 and II-3, very preferred those of the Formula II-1 and II-2. In the compounds of the Formulae II-1 to II-7 R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl X0preferably denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. In one embodiment, the LC medium contains one or more compounds of the Formula II or their subformulae as described above and below, wherein Y0is CH3. Very preferably, the LC medium according to this preferred embodiment comprises one or more compounds of the Formula II selected from the following subformulae: 1 2 3 4 5 6 7 in have the meanings given in the Formula II. Preferred compounds are those of the Formula IIA-1, IIA-2 and IIA-3, very preferred are those of Formula IIA-1 and IIA-2. In the compounds of the Formulae IIA-1 to IIA-7 R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl X0denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. The proportion of the compounds of the Formula II in the LC medium is typically from 0 to 30%, very preferably from 1 to 20%, most preferably from 2 to 15% by weight. In a further preferred embodiment, the LC medium comprises one or more compounds of the Formula III selected from the following subformulae: 1 2 3 4 5 6 7 8 in have the meanings given in the Formula II. Particularly preferred compounds are those of the Formulae III-1, III-4, III-6, III-16, III- 19, III-20 and III-22. In the compounds of the Formulae III-1 to III-22 R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl X0denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably denotes H. The LC medium may contain one or more compounds of the Formula III or their subformulae as described above and below Y0is CH3. Very preferably, the LC medium according to this preferred embodiment comprises one or more compounds of the Formula III selected from the following subformulae: 1 2 3 4 5 6 7 3 in have the meanings given in the Formula III. Preferred compounds are those of the Formula IIIA-1, IIIA-4, IIIA-6, IIIA-16, IIIA-19 and IIIA-20. In the compounds of the Formulae IIIA-1 to IIIA-21 R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl X0denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. The proportion of the compounds of the Formula III in the LC medium is preferably from 2 to 60%, very preferably from 5 to 50%, most preferably from 10 to 30% by weight. In a further preferred embodiment, the LC medium may additionally comprise one or more compounds selected from the following formulae: IV V in which have the meanings indicated in the Formulae II and III, Z0denotes -C2H4-, -(CH2)4-, -CH=CH-, -CF=CF-, -C2F4-, -CH2CF2-, -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-, or -OCF2-, in the Formulae V and VI also a single bond; and s denotes 0 or 1. The compounds of the Formula IV are preferably selected from the following formulae: a in have the meanings indicated in the Formulae II and III. R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or preferably denotes F or OCF3, furthermore OCF=CF2, OCHFCF3or Cl. The compounds of the Formula IVa are preferably represented by the following subformulae: 1 1 The compounds of the Formula IVb are preferably represented by the following formulae: 1 2 The compounds of the Formulae IVc are preferably represented by the following subformulae: in which R0has the meanings indicated in the Formula II and is preferably alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, n-propyl, n- butyl or n-pentyl. The compound(s) of the Formula IVc, in particular of the Formula IVc-1, is (are) preferably employed in the LC media according to the invention in amounts of from 1% to 20% by weight, particularly preferably from 2 to 15% by weight. The compounds of the Formula V are preferably selected from the following subformulae: in have the meanings indicated in the Formula II. R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or preferably denotes F and OCF3, furthermore OCHF2, CF3, OCF=CF2, OCHFCF3and OCH=CF2. The compounds of the Formula VI are preferably selected from the following subformulae: e in have the meanings indicated in the Formula II. R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, n-propyl, n-butyl or n- X0preferably denotes F,furthermore OCF3, CF3, CF=CF2, OCHF2, OCHFCF3and OCH=CF2;Preferred compounds of the Formulae VIa to VIe are those selected from the following subformulae: 1 2 3 1 "alkyl" being an alkyl group with 1 to 6 C atoms, being preferably selected from ethyl, propyl, butyl, pentyl, wherein propyl is particularly preferred. The compounds of the Formula VII are preferably selected from the following subformulae: in have the meanings indicated in the Formula II. R0preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or preferably denotes F, furthermoreOCF3, OCHF2, OCHFCF3and OCH=CF2.In some embodiments, the LC medium additionally comprises one or more compounds selected from the following formulae: in which R0and X0each, independently of one another, have one of the meanings indicated in the Formula II, L1-4each, independently of one another, denote H or F, Y0denotes H or CH3, preferably H, X0is preferably F, Cl, CF3, OCF3or OCHF2, OCF=CF2, OCHFCF3, R0preferably denotes alkyl, alkoxy, oxaalkyl, cycloalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms. Very preferably, the LC medium according to the invention comprises one or more compounds of the following Formula XXa: a in which R0denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. R0preferably denotes straight-chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl. The compound(s) of the Formula XX, in particular of the Formula XXa, is (are) preferably employed in the LC media according to the invention in amounts of 0-15% by weight, particularly preferably 1-10% by weight. The compounds of the Formula XXI are preferably represented by the Formulae XXIa to XXIc: a in which R0denotes an alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl; and X0denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl. In a particularly preferred embodiment, the compounds of Formula XXI are represented by the following structure: 1 in which R0denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl. R0preferably denotes straight-chain alkyl, in particular ethyl, n-propyl, n-butyl or n-pentyl and very particularly preferably n-propyl. The compound(s) of the Formula XXI, in particular of the Formula XXIa-1, is (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 compounds of the Formula XXIIIa: a in which R0denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms. 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. Preferred specific compounds of Formula XXIIIa include, in particular 1 2 The compound(s) of the Formula XXIII, in particular of the Formula XXIIIa, is (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. The LC medium may additionally comprise one or more compounds of the Formula XXIV: in which R0, X0and L1-6have the meanings indicated in the Formula III, s denotes 0 or 1, and . In the 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. R0preferably denotes alkyl having 1 to 6 C X0preferably denotes F. The compounds of the Formula XXIV are preferably selected from the following subformulae: in and L1have the meanings indicated in the Formula III. R0preferably denotes alkyl having 1 to 6 C X0preferably denotes F, and L1is preferably F; ,, , 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- lae: in which R1and X0have the meanings indicated in the Formula II for R0and X0, respectively. R1preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl. X0preferably denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F. In the Formula XXIV, X0very particularly preferably denotes Cl. The LC medium may further optionally comprise one or more compounds of the following formulae: in which R1, have the meanings indicated in the respectively. R1preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl . X0preferably denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F, and Y0preferably denotes H. In some embodiments, the LC medium according to the invention preferably comprises one or more compounds of the Formula XXIX in which X0preferably denotes F. The compounds of the Formula XXVII are preferably selected from the subformulae XXVIIa, wherein XXVIIa-1, XXVIIa-2 and XXVIIa-3 are mostly preferred: 1 2 3 "alkyl" being an alkyl group with 1 to 6 C atoms. The compounds of the Formula XXVIII are preferably selected from the subformulae XXVIIIa, wherein XXVIIIa-1 and XXVIIIa-2 are mostly preferred: 1 2 "alkyl" being an alkyl group with 1 to 6 C atoms. The compound(s) of the Formulae XXVII - XXX is (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 the Formula XXIX and / or the Formula XXX. Very preferably, the LC medium according to the invention comprises one or more compounds of the Formulae XXIXa and / or XXXa: in which have the meanings indicated for R0 Y0in the Formula II, and preferably R1denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl. The compound(s) of the Formulae XXIXa and / or XXXa is / are preferably employed in the LC media according to 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: 1 2 3 in have the meanings indicated in the Formula II for and Y0, respectively. R1preferably denotes alkyl having 1 to 6 C atoms or cycloalkyl having 3 to 6 C atoms, very preferably ethyl, propyl, butyl or pentyl. X0preferably denotes F, CF3or OCF3, furthermore OCF=CF2, OCHFCF3or Cl, very preferably F preferably denotes H. The medium according to the invention particularly may optionally comprise one or more compounds of the Formula XXXI-1, in which X0preferably denotes F. The compound(s) of the Formulae XXXI-1 to XXXI-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. In addition to the compounds of the Formulae L and S, the LC medium preferably contains one or more compounds of the Formulae N1 and N2: 42 N1 in which 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 , 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 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, if also these independently of one another, denote , , , , preferably one or more of Z41and 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, 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 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 4 C atoms, preferably alkenyloxy, 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, , if present, each, independently of one another, denote , , preferably preferably , Z51to Z53each, independently of one another, denote -CH2-CH2-, -CH2-O-, -CH=CH-, -C≡C-, -COO- or a single bond, preferably -CH2-CH2-, -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 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 following formulae: wherein "alkyl" and "alkyl*" each, independently from one another, denote an alkyl group having 1 to 6 C atoms; "alkenyl" and "alkenyl*" each, independently of one another, denote an alkenyl group having 2 to 6 C atoms. Very preferred are compounds of the Formula Z1 and Z2. Preferred compounds of the Formulae Z1 to Z11 are those selected from the following subformulae: 1 2 3 1 2 3 4 5 6 1 1 2 3 4 1 2 3 1 2 3 4 1 1 In another preferred embodiment, the LC medium contains one or more compounds of the Formula Z1 or its preferred subformulae and / or one or more compounds selected from the Formulae Z2, Z3, Z4 and Z5 or their preferred subformulae. Preferably, the total proportion of compounds of the Formula Z1, Z2, Z3, Z4, Z5 and Z6 or their subformulae, such as CC-3-V in the medium is from 10 to 65%, very preferably from 20 to 60%, most preferably from 25 to 55% by weight. In yet a more preferred embodiment, the compound of the 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 the Formulae Z1-1 and Z4-2 in total. Preferably, the medium contains 1, 2 or 3 compounds selected from the Formulae Z1, Z2, Z3 and Z4 or their subformulae. The LC medium may additionally comprise one or more compounds of the following general formulae: XI in which R1and R2each, independently from one another, denote C1-6-alkyl, C1-6-alkoxy or C2-6-alkenyl.The compounds of the Formula XI are preferably selected from the following subformulae: wherein “alkyl” and “alkyl*” each, independently from one another, denote methyl, ethyl, propyl, butyl, pentyl or hexyl. The LC medium may additionally comprise one or more compounds of the following general formulae: in which R1and R2each, independently from one another, denote C1-6-alkyl, C1-6-alkoxy or C2-6-alkenyl.The compounds of the Formula XII are preferably selected from the following subformulae: wherein “alkyl” and “alkyl*” each, independently from one another, denote methyl, ethyl, propyl, butyl, pentyl or hexyl. Particular preference is given to the compounds of the Formulae XIIa and XIIc. In the Formula XIIb, "alkyl" preferably, independently of one another, denotes n-C3H7, n-C4H9or n-C5H11, in particular n-C3H7. In the Formula XIIc, "alkyl" preferably denotes n-C3H7and "alkyl*" is preferably CH3or n-C3H7. Particularly preferred compounds of the Formula XII are described by the following structures: 1 2 1 1 1 3 The LC medium may additionally comprise one or more compounds selected from the following formulae: in which L1and L2have the meanings indicated in the Formula III, and R1and R2each, independently of one another, denote n-alkyl, cycloalkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms; in the compound of the 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 the Formula XIV in which at least one of the substituents R1and R2denotes alkenyl having 2 to 6 C atoms, preferably those selected from the following subformulae: in which "alkyl" and "alkyl*" have the meaning indicated above, and each, independently of one another, preferably denote methyl, ethyl or propyl. The compounds of the Formulae XIV are preferably selected from the following subformulae: 1 1 2 1 2 3 Very preferred are compounds of the Formulae XIVd-1, XIVe-1, XIVe-2 and XIVe-3. The LC medium may further optionally comprise one or more compounds of the Formula XV in which at least one of the substituents denotes alkyl or alkoxy having 2 to 6 C atoms, preferably those selected from the following subformulae: in which "alkyl" and "alkyl*" has the meaning indicated above, and each, independently of one another, preferably denote methyl, ethyl or propyl. The compounds of the Formulae XV are preferably represented by the following subformula: XVa In yet a further embodiment, the LC medium comprises one or more compounds of the Formula XVI: I in which R1and R2have the meanings indicated for R0in the Formula II, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H or F. Particularly preferred compounds of the Formula XVI are those of the subformulae: 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 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 the Formulae XVIb and XVIc. Very particular preference is given to the compounds of the following subformulae: 1 2 3 1 2 3 In yet a further embodiment, the LC medium comprises one or more compounds of the Formula XIII: in which R1and R2have the meanings indicated for R0in the Formula II, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H, F or Cl. Particularly preferred compounds of the Formula XIII are those of the subformulae: 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 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 the Formulae XIIIa and XIIIb. Very particular preference is given to the compounds of the following subformulae: 1 2 3 1 2 3 In yet a further embodiment, the LC medium comprises one or more compounds of the Formula XIII: in which R1and R2have the meanings indicated for R0in the Formula II, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H, F or Cl. Particularly preferred compounds of the Formula XIII are those of the subformulae: 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 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 the Formulae XIIIa and XIIIb. Very particular preference is given to the compounds of the following subformulae: 1 2 3 1 2 3 The LC medium may optionally comprise one or more compounds of the following for- mulae: in which R1and R2have the meanings indicated in the Formula L, respectively, and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. L denotes H or F. Very preferred are compounds of the Formula XVIIa, wherein L is H or F. Very preferred are compounds of the Formula XVIIb, wherein L is F. The LC medium may additionally comprise one or more compounds of the following formula: in which L, R1and R2have the meanings indicated in the Formula L for L1, R1and R2, respectively. R1and R2preferably denote alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms. Particularly preferred compounds of the Formula XXXII are those of the subformulae: 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” denotes a straight-chain alkenyl group having 2 to 6 C atoms, in particular CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH andCH3CH=CH. Very particular preference is given to the compounds of the following subformulae: 1 2 3 1 2 3 4 1 In some further embodiments, the LC medium comprises one or more compounds of the following formulae: XXXV in which R1and R2each, independently from one another, have the meanings indicated in the Formula L for R1and R2and preferably each, independently of one another, denote alkyl having 1 to 6 C atoms. Very particular preference is given to the compounds of the following subformulae: 1 2 3 Advantageously, the LC medium of the present invention may comprise one or more compounds of the Formula LP1 and / or one or more compounds of the Formula LP2 in which the individual substituents have the following meanings: R0has one of the meanings given in for R1in the Formula L; R2denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 or 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, -CF2O-, , , -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 substituted by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms; X0has one of the meanings given in X0in the Formula II; Y0denote H or CH3; and m and n denotes 0 or 1. The one or more compounds of the Formulae LP1 and LP2 may be preferably described by the following Formulae: 1 2 1 2 3 in which 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 , a way that O atoms are not linked directly to one another, and in which one or more H atoms may be substituted by a halogen atom; 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-, , -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 substituted by a halogen atom; 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 Y0H or CH3. The compounds of the general Formulae LP1 and LP2 can also be represented by one of the following structures: in which R0is an alkyl or an alkoxy group having 1 to 12 C atoms in which one or 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 substituted 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 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. Particularly preferred compounds of the Formula LP1 are those selected from the group consisting of the following subformulae: preferably H. Particularly preferred compounds of the Formula LP2 are those selected from the group consisting of the following subformulae: preferably H. Very preferred are compounds of the Formulae LP2-1a, LP2-1b, LP2-1c, LP2-1d, and LP2-1i, LP2-2b, LP2-3a, LP2-3c mostly preferred is the compound Formula LP2-1b. Preferably, the LC medium comprises one or more compounds of the Formula LP1 and one or more compounds of the Formula LP2. The total proportion of the compounds of the Formula LP1 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. The total proportion of the compounds of the 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. Preferably, the LC medium contains 1, 2 or 3 compounds of the Formula LP1 or their subformulae. In a particularly preferred embodiment, the LC medium comprises at least one compound of the Formula LP1. In addition to the compounds of the Formulae L and S, the LC medium may optionally contain one or more compounds selected from the Formulae Y and B: Y B in which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meanings: wherein each, independently from one another, have one of the meanings given for R1and R2in the Formula L,R3one of the meanings given for R1, Zx, Zy-CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -O-CO-, -C2F4-, -CF=CF-, -CH=CH-CH2O-, or a single bond, preferably a single bond, Zz-CH2O-, -O-, -C2H4-, -OCH2-, or a single bond, Y1-CH2-, -O- or -S-, L1-4H, F or Cl, preferably H or F, very preferably F, x, y 0, 1 or 2, with x+y ≤ 3, z 0 or 1, wherein in the Formula B the dibenzofuran or dibenzothiophene group may also be further substituted by a methyl or methoxy group, and wherein the compounds of the Formula Y contain at least one substituent L1-4that is F or Cl, preferably F. The LC medium according to this first preferred embodiment may contain one or more compounds of the Formulae L and S, one or more compounds selected from the Formulae Z1, Z2 and Z3, and one or more compounds selected from the Formulae Y and B. The LC media according to this first preferred embodiment are especially suitable for use in LC displays of the HB-FFS or PS-HB-FFS mode. In the compounds of the Formula Y and its subformulae, R1and R2preferably denote straight-chain alkyl or alkoxy having 1 to 6 C atoms, furthermore alkenyl having 2 to 6 C atoms, in particular vinyl, 1E-propenyl, 1E-butenyl, 3-butenyl, 1E-pentenyl, 3E-pentenyl or 4-pentenyl. In the compounds of the Formula Y and its subformulae, preferably both substituents L1and L2denote F. In another preferred embodiment of the present invention, in the compounds of the Formula Y and its subformulae one of the substituents L1and L2denotes F and the other denotes Cl. In a preferred embodiment of the present invention, the LC medium contains one or more compounds of the Formula Y selected from the following subformulae: wherein R1, R2, Zxand Zyhave the meanings given in the Formula Y, a denotes 1 or 2, b denotes 0 or 1, L1, L2denote F or Cl, preferably F, and L5denotes a H atom or CH3, 4 Preferably, in the compounds of the Formula Y1 and Y2 both L1and L2denote F or one of L1and L2denotes F and the other denotes Cl, or both L1and L2denote F or one of L1and L2denotes F and the other denotes Cl. Preferably, the LC medium comprises one or more compounds of the Formula Y1 selected from the group consisting of the following subformulae: 1 2 3 4 in which a denotes 1 or 2, “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, “alkenyl” denotes a straight-chain alkenyl group having 2 to 6 C atoms, and denotes a H atom or CH3. “alkenyl” preferably denotes CH2=CH-, CH2=CHCH2CH2-, CH3-CH=CH-, CH3-CH2- CH=CH-, CH3-(CH2)2-CH=CH-, CH3-(CH2)3-CH=CH- or CH3-CH=CH-(CH2)2-.Very preferably, the LC medium contains one or more compounds of the Formula Y1 selected from the Formulae Y1-1, Y1-2, Y1-7, Y1-12, Y1-17, Y1-22, Y1-40, Y1-41, Y1- 42, Y1-44, Y1-50 and Y1-68. L5preferably denotes a H atom. Further preferably, the LC medium comprises one or more compounds of the Formula Y2 selected from the group consisting of the following subformulae: 1 2 3 4 5 6 in which “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, and “alkenyl” denotes a straight-chain alkenyl group having 2 to 6 C atoms, (O) denotes an oxygen atom or a single bond, and L5denotes a H atom or CH3, preferably a H atom. “alkenyl” preferably denotes CH2=CH-, CH2=CHCH2CH2-, CH3-CH=CH-, CH3-CH2-CH=CH-, CH3-(CH2)2-CH=CH-, CH3-(CH2)3-CH=CH- orCH3-CH=CH-(CH2)2-.Very preferably, the LC medium contains one or more compounds of the Formula Y2 selected from Formulae Y2-2 and Y2-10. The proportion of the compounds of the Formula Y1 or its subformulae in the LC medium is preferably from 0 to 10% by weight. The proportion of the compounds of the Formula Y2 or its subformulae in the LC medium is preferably from 0 to 10% by weight. The total proportion of the compounds of the Formula Y1 and Y2 or their subformulae in the medium is preferably from 1 to 20%, very preferably from 2 to 15% by weight. Preferably, the LC medium contains 1, 2 or 3 compounds of the Formula Y1 and Y2 or their subformulae, very preferably selected from the Formulae Y1-2, Y1-22, Y1-66, Y1- 70, Y2-6 and Y2-22. In another preferred embodiment of the present invention, the LC medium contains one or more compounds of the Formula Y of the following subformula: Y3 wherein L1, L2, L5, R1and R2have one of the meanings given in the Formula L for L1, respectively.Preferred compounds of the Formula Y3 are selected from the group consisting of the following subformulae: 1 2 3 4 5 6 7 8 in which, “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms; “alkenyl” and “alkenyl*” each, independently of one another, denote a straight-chain alkenyl group having 2 to 6 C atoms; and (O) denotes an oxygen atom or a single bond. “alkenyl” and “alkenyl*” preferably denote CH2=CH-, CH2=CHCH2CH2-, CH3-CH=CH-, CH3-CH2-CH=CH-, CH3-(CH2)2-CH=CH-, CH3-(CH2)3-CH=CH- orCH3-CH=CH-(CH2)2-.Particularly preferred compounds of the Formula Y3 are selected from the group consisting of following subformulae: wherein “alkoxy” and “alkoxy*” each, independently of one another, preferably denote straight-chain alkoxy with 3, 4, or 5 C atoms. Preferably, in the compounds of the Formula Y3 and its subformulae both L1and L2denote F. Further preferably in the compounds of the Formula Y3 one of the substituents L1and L2denotes F and the other denotes Cl. The proportion of the compounds of the Formula Y3 or its subformulae in the LC medium is preferably from 0 to 10%, very preferably from 1 to 6% by weight. Preferably, the LC medium contains 1, 2 or 3 compounds of the Formula Y3 or its subformulae, more preferably of the Formula Y3-6, very preferably of the Formula Y3- 6A. In yet another preferred embodiment of the present invention, the LC medium contains one or more compounds of the Formula Y of the subformula Y4: in which R1and R2each, independently of one another, have one of the meanings indicated above in the Formula Y, and each, independently of one another, denote in which L5denotes F or Cl, preferably F, and L6denotes F, Cl, OCF3, CF3, CH3, CH2F or CHF2, preferably F, and preferably at least one of the rings G, I and K is different from unsubstituted benzene. Mostly preferred compounds of the Formula Y4 are selected from the group consisting of the following subformulae: 1 in which R denotes a straight-chain alkyl or alkoxy group having 1 to 6 C atoms, (O) denotes an oxygen atom or a single bond, and m denotes an integer from 1 to 6. R preferably denotes methyl, ethyl, propyl, butyl, pentyl, hexyl, methoxy, ethoxy, propoxy, butoxy or pentoxy. The proportion of the compounds of the Formula Y4 or its subformulae in the medium is preferably from 0 to 10%, very preferably from 1 to 6% by weight. her preferred embodiments are indicated below: - The LC medium comprises one or more compounds of the Formula Y of the following subformula wherein R1, R2, L1, L2, X, x and Zxhave the meanings given in the Formula Y, and wherein at least one of the rings X is cyclohexenylene. Preferably, both substituents L1and L2denote F. Further preferably, one of the substituents L1and L2denotes F and the other denotes Cl. The compounds of the Formula LY are preferably selected from the group consisting of the following subformulae: 1 in which R1has the meaning indicated in the Formula Y above, (O) denotes an oxygen atom or a single bond, and v denotes an integer from 1 to 6. R1preferably denotes straight-chain alkyl having 1 to 6 C atoms or straight-chain alkenyl having 2 to 6 C atoms, in particular CH3, C2H5, n-C3H7, n-C4H9, n-C5H11, CH2=CH-, CH2=CHCH2CH2-, CH3-CH=CH-, CH3-CH2-CH=CH-,CH3-(CH2)2-CH=CH-, CH3-(CH2)3-CH=CH- or CH3-CH=CH-(CH2)2-.Very preferred are compounds of the Formula LY4. Preferably, the medium contains 1, 2 or 3 compounds of the Formula LY, very preferably of the Formula LY4. The proportion of the compounds of the Formula LY or its subformulae in the medium is preferably from 1 to 10% by weight. - The medium comprises one or more compounds of the Formula Y represented by the following subformula: wherein R1, R2, L1, L2, Y, y and Zyhave the meanings given in the Formula Y, and wherein at least one of the rings Y is tetrahydropyrane. The compounds of the Formula AY are preferably selected from the group consisting of the following subformulae: 2 3 0 in which R1has the meaning indicated above, “alkyl” denotes a straight-chain alkyl group having 1 to 6 C atoms, (O) denotes an oxygen atom or a single bond, and v denotes an integer from 1 to 6. R1preferably denotes straight-chain alkyl having 1 to 6 C atoms or straight-chain alkenyl having 2 to 6 C atoms, in particular CH3, C2H5, n-C3H7, n-C4H9, n-C5H11,CH2=CH-, CH2=CHCH2CH2-, CH3-CH=CH-, CH3-CH2-CH=CH-,CH3-(CH2)2-CH=CH-, CH3-(CH2)3-CH=CH- or CH3-CH=CH-(CH2)2-.In the compounds of the Formula B and its subformulae, R1and R3preferably denote straight-chain alkyl or alkoxy having 1 to 6 C atoms, in particular methoxy, ethoxy, propoxy or butoxy, furthermore alkenyl having 2 to 6 C atoms, in particular vinyl, 1E-propenyl, 1E-butenyl, 3-butenyl, 1E-pentenyl, 3E-pentenyl or 4-pentenyl. In a preferred embodiment of the present invention, the medium contains one or more compounds of the Formula B selected from the following subformulae: wherein Y1, L1, L2, R1and R3have the meanings given in the Formula B. Preferred compounds of the Formula B1 are selected from the following subformulae: 1 2 wherein R1and R3independently denote a straight-chain alkyl group having 1 to 6 C atoms, in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, , -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. Very preferred are compounds of the Formula B1-1 and B1-2 wherein both groups (O) denote an oxygen atom and R1and R3independently denote an alkyl group being methyl, ethyl, propyl, butyl, pentyl or hexyl, which are preferably straight-chained. Very preferably one “alkyl” is ethyl and the other “alkyl*” is n-pentyl. Particularly preferred are compounds of the Formula B1-2. Preferably, the compounds of the Formula B1-1 are selected from the group of compounds of the Formulae B1-1-1 to B1-1-11, preferably of the Formula B1-1-6: 1 2 3 in which “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, “alkenyl” and “alkenyl*” each, independently of one another, denote a straight-chain alkenyl group having 2 to 6 C atoms, “alkoxy” and “alkoxy*” each, independently of one another, denote a straight-chain alkoxy group having 1 to 6 C atoms. Preferably, the compounds of the Formula B1-2 are selected from the group of compounds of Formulae B1-2-1 to B1-2-10, preferably of Formula B1-2-6: 1 2 3 4 5 6 7 8 9 10, in which “alkyl” and “alkyl*” each, independently of one another, denote a straight-chain alkyl group having 1 to 6 C atoms, “alkenyl” and “alkenyl*” each, independently of one another, denote a straight-chain alkenyl group having 2 to 6 C atoms, “alkoxy” and “alkoxy*” each, independently of one another, denote a straight-chain alkoxy group having 1 to 6 C atoms. Optionally, the LC medium comprises one or more compounds of the Formula B1-1A and / or B1-2A: in which (O) denotes O or a single bond, RIIIAdenotes alkyl or alkenyl having up to 7 C atoms or a group Cy-CmH2m+1-, m and n are, identically or differently, 0, 1, 2, 3, 4, 5 or 6, preferably 1, 2 or 3, very preferably 1, Cy denotes a cycloaliphatic group having 3, 4 or 5 ring atoms, which is optionally substituted with alkyl or alkenyl each having up to 3 C atoms, or with halogen or CN, and preferably denotes cyclopropyl, cyclobutyl or cyclopentyl. The compounds of the Formulae B1-1A and / or B1-2A are contained in the medium either alternatively or in addition to the compounds of the Formulae B1-1 and B1-2, preferably additionally. Preferred compounds of the Formulae B1-1A and / or B1-2A are also the following: B1-1A-1 2 3 1 2 3 in which alkoxy denotes a straight-chain alkoxy group having 1 to 6 C atoms or alternatively –(CH2)nF in which n is 2, 3, 4, or 5, preferably C2H4F. The proportion of the compounds of the Formula B1 or its subformulae in the LC medium is preferably from 1 to 20%, very preferably from 1 to 15% by weight. Preferably, the LC medium contains 1, 2 or 3 compounds of the Formula B1 or its subformulae. The LC medium of the present invention may further optionally comprise one or more compounds of Formula T: T in which R3and R4each, independently from one another, denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl group having 2 to 12 C atoms in which one or more CH2groups are optionally substituted 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, 6 each, independently from one another, denote H or F, 3 each, independently from one another, denote H or a straight-chain or branched alkyl or alkoxy group having 1 to 6 C atoms, or a cycloalkyl or a cycloalkoxy group having 3 to 6 C atoms; and m denotes 0 or 1. Preferably, the one or more compounds of the Formulae T are selected from the group consisting of the compounds of the following formulae: 1 2 3 4 5 R3and R4each, independently from one another, denote 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 substituted by -C^C-, , 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, L1and L2each, independently from one another, denote H or F; and and Y2each, independently from one another, denote H or a straight-chain or branched alkyl or alkoxy group having 1 to 6 C atoms, or a cycloalkyl or a cycloalkoxy group having 3 to 6 C atoms, preferably H or CH3. In a particularly preferred embodiment, the compounds of general Formula T can be represented by one of the following: groups are optionally substituted by -C^C-, -CF2O-, - , 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 cycloalkyloxy group having 3 to 6 C atoms, wherein vinyl, allyl or cyclopentyl are particularly preferable; denotes H or CH3, preferably H; and m denotes 1, 2, 3 or 4. In the context of the present invention, use of compounds of sub-formula T-1a offers advantages over the use of T-1b in terms of low temperature stability of the resulting LC medium. Very preferred compounds of Formula T are those selected from the group consisting of the following subformulae: 1 2 3 4 5 6 7 8 9 11 1 2 3 4 5 5 2 1 2 3 4 5 6 preferably H. Compounds of Formula ST In some preferred embodiments of the present invention, the LC medium may further comprise one or more compounds of the general Formula ST: in which in which the individual substituents have the following meanings: ; X21, X22each, independently of one another, denote -O-, -CH2-, -CHR23- or-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, alkynyl, 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 , a way that O atoms are not linked directly to one another, and in which one or more H atoms may be substituted 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 substituted by a halogen atom, denotes a H atom, an alkyl or alkoxy group having1 to 10 C atoms, r 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: 1 2 3 4 in which the individual substituents have the following meanings: ; 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. In particularly preferred embodiments, the compounds of the general Formula ST can be selected from the following specific structures: 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 In a further preferred embodiment, the LC medium according to the present invention may comprise at least one further sterically hindered phenol, which is mentioned in Table B below. Compounds of Formula H The LC medium may optionally comprise one or more compounds of the Formula H H in which 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 plurality of -CH2- groups may be substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted by -O-, and one or, if present, a plurality of -CH2- groups may be substituted by -CH=CH- or -C≡C-, and in which one H atom or a plurality of H atoms may be substituted by F, 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- groups may be substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted 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 substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted by -O-, and in which one H atom or a plurality of H atoms may be substituted by F, OR13, N(R13)(R14) or R15, or an aromatic or heteroaromatichydrocarbon group, in which one H atom or a plurality of H atoms may be substituted by OR13, 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, 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 substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted 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, 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 substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted by -O-, and in which one H atom or a plurality of H atoms may be substituted by F, OR13, N(R13)(R14) or R15, or denote a single bond, each, independently of one another, denote methyl or ethyl, denotes C, each, independently of one another, denote -O-, -(C=O)-, -O-(C=O)-, -(C=O)-O-, -O-(C=O)-O-, -(N-R13)-, -N-R13-(C=O)- or a single bond if is a single bond, both Z11and Z12do not simultaneously denote - is a single bond, both Z13and Z14do not simultaneously denote -O-; and, if q denotes 0, both Z12and Z13do not simultaneously denote -O-, p denotes 1 or 2, q denotes 0 or 1, o denotes (3-p), n denotes an integer from 1 to 10, 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, In some preferred embodiments of the present invention, in the compounds of the Formula H, 6, ethane-1,2-diyl, propane-1,3-diyl, butane-1,4-diyl, pentane- 1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, octane-1,8-diyl, (1,4-phenylene), (1,3-phenylene), (1,2-phenylene) or (trans-1,4-cyclohexylene) and / or 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=O)-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, preferably -O-, -S11-O-, -O-S11-O-, -(C=O)-O-S11-O-, -O-(C=O)-S11-O- preferably denotes an alkylene group having 1 to 20 C atoms, and / or R11if present, denotes alkyl, alkoxy or H, preferably H or alkyl, and / or R12denotes H, methyl, ethyl, propyl, isopropyl or 3-heptyl, or cyclohexyl. In a preferred embodiment of the present application, in the compounds of the Formula H, n denotes a group selected from the group of the formulae: , In a further preferred embodiment of the present application, in the compounds of the Formula H, n denotes a group selected from the group of the formulae , . In yet a further preferred embodiment of the present invention, in the compounds of the Formula H in which p preferably denotes 1, , preferably -O-S11-O-, -S11-O- or -O-S11-, particularly preferably -O-S11-O- or -S11-O-. In a further preferred embodiment of the present invention, in the compounds of the Formula H, the group denotes a group selected from the group of the formulae , .In a further preferred embodiment of the present invention, in which p is 2, which may be identical to or different from those described above, in the compounds of the Formula H, denotes a group selected from the group of the formulae H ,H . 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 the Formula H, the group , on each occurrence, independently of one another, denotes ,, .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: 1 2 3 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. In a particularly preferred embodiment, the one or more compounds of the Formula H may be selected from the group consisting of the compounds the following Formulae H-2-1 to H-2-6: 1 2 3 4 5 6 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 plurality of -CH2- groups may be substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted by -O-, and one or, if present, a plurality of -CH2- groups may be substituted by-CH=CH- or -C≡C-, and in which one H atom or a plurality of H atoms may be substituted by F, OR13, N(R13)(R14) or R15,R16denotes a H atom or O•, n denotes an integer from 0 to 12, and 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 substituted by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted by -O-, and in which one H atom or a plurality of H atoms may be substituted by or R15, or denote a single bond. In a preferred embodiment of the present invention, the LC media comprise in each case one or more compounds of the Formula H selected from the following group of the compounds of the formulae: 1 2 3 4 5 6 7 8 9 and 21 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 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 a H atom, which are known as NH radical type HALS are advantageously used in proportion ranging from 50 ppm to 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: ^ a compound of the Formulae L and S in combination with a compound of the Formula LP1, Z1 to Z11 and III ^ a compound of the Formulae L and S in combination with a compound of the Formula LP2, Z1 to Z11 and III ^ a compound of the Formulae L and S in combination with a compound of the Formula LP1, LP2, III and a compound of the Formula Z1 and Z4 - The LC medium comprises one or more compounds of the Formulae L and S or its subformulae and LP1 and / or LP2, III and one or more compounds selected from the group consisting of the Formulae Z1, Z2, Z3, Z4, Z5, V, VI, VII, VIII, XIV, XV, XVI, XVIIa, XVIIb, XVIIc, XVIII, XIX, XX, XXI, XXIII, XXIV, XXV, XXVI, XXVII, XXVIII, XXIX, XXX, XXX-1, XXX-2, XXX-3, XXXII, XXXIII and their subformulae. - The LC medium comprises one or more compounds of the Formulae L and S or its subformulae and LP1 and / or LP2, III and one or more compounds selected from the group consisting of the Formulae Z1, Z2, Z3, Z4, Z5, IV, VI, XII, XIV, XVI, XVIIa, XVIIb, XVIIc, XX, LP1-1, XXIII, XXIX and their subformulae. - The LC medium comprises one or more compounds selected from the group consisting of the Formula III-1, III-4, III-6, III-16, III-19 and III-20, very preferably from the group consisting of the Formula 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 30% by weight. - The LC medium comprises one or more compounds of the Formula IV, preferably selected from the Formula IVa or IVc, very preferably from the Formula IVa-1 or IVc- 1, most preferably of the 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. - The LC medium comprises one or more compounds of the Formula VI, preferably selected from the Formula VIb. 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. - The LC medium comprises one or more compounds of the Formula Z1, preferably selected from the Formula Z1-1. The total concentration of these compounds is preferably from 10 to 70 % by weight, more preferably 20 to 60 % by weight, even more preferably 30 to 50 % by weight. - The LC medium comprises one or more compounds of the Formula Z2, preferably selected from the 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. - The LC medium comprises from 5 to 20% by weight of compounds of the Formula Z3, preferably of the Formula Z3-1. - The LC medium comprises from 5 to 20% by weight of compounds of the Formula Z4, preferably of the Formula Z4-1. - The LC medium comprises from 1 to 30%, very preferably from 2 to 15% by weight of compounds of Formula Z5. - The LC medium comprises one or more compounds of the Formula LP1-1, preferably of the Formula LP1-1a or LP2-1b, very preferably of the Formula LP1-1a. The concentration of these compounds is preferably from 1 to 15% by weight. - The LC medium comprises from 1 to 15% by weight of compounds of the Formula LP2-1b. - The LC medium comprises one or more compounds of the Formula XII, preferably of the Formula XIIa or XIIb, very preferably of the Formula XIIa, most preferably of the Formula XIIa-1. The concentration of these compounds is preferably from 2 to 15% by weight. - The LC medium comprises from 1 to 15% by weight of compounds of the Formula XIIb. - The LC medium comprises one or more compounds of the Formula XIV, preferably of the Formula XIVd, very preferably of the Formula XIVd-1. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formula XVIb, preferably of the Formula XVIb-1, XVIb-2 and / or XVIb-3. The concentration of these compounds is preferably from 2 to 15% by weight. - The LC medium comprises one or more compounds of the Formula XVIc, preferably of the Formula XVIc-1, XVIc-2 and / or XVIc-3. The concentration of these compounds is preferably from 2 to 20% by weight. - The LC medium comprises one or more compounds selected from the group consisting of the Formulae XVIIa, XVIIb and XVIIc, very preferably of the Formula XVIIa wherein L is H and of the Formula XVIIb wherein L is F. The total concentration of these compounds is preferably from 0.5 to 5% by weight. - The LC medium comprises one or more compounds of the Formula XX, preferably of the Formula XXa. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formula XXI, preferably of the Formula XXIa. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formula XXIII, preferably of the Formula XXIIIa. The concentration of these compounds is preferably from 0.5 to 5% by weight. - The LC medium comprises one or more compounds of the Formula XXIX, preferably of the Formula XXIXa. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formula XXX. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formula XII. The concentration of these compounds is preferably from 2 to 10% by weight. - The LC medium comprises one or more compounds of the Formulae L and S, preferably of the Formulae L-2 and S-1-4-1, and LP1 and / or LP2, III, one or more compounds selected from the group consisting of the Formulae Z1, Z2 and Z4 or their subformulae, one or more compounds selected from the group consisting of the Formula XIV, one or more compounds selected from the group consisting of the Formulae IV, VI, XX, XXIII and XXIX or their subformulae, and one or more compounds selected from the group consisting of the Formulae LP2-1, XVI, XVIIa, XVIIb, XVIIc or their subformulae. - The LC medium comprises one or more compounds of Formulae L and S, preferably of the Formulae L-2 and S-2-4, S-2-7, LP1 and / or LP2, III, one or more compounds selected from the group consisting of the Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae, one or more compounds selected from the group consisting of the Formula XIVd or their subformulae, one or more compounds selected from the group consisting of the Formulae IVc, VIb, XXa, XXIIIa and XXIXa or their subformulae, and one or more compounds selected from the group consisting of the Formulae LP1-1b, XVIb, XVIc, XVIIa, XVIIb, XVIIc or their subformulae. - The LC medium comprises one or more compounds of the Formulae L and S, preferably of the Formulae L-2 and S-1-4-1, LP1 and / or LP2, III, one or more compounds selected from the group consisting of the Formulae Z1, Z2 and Z3 or their subformulae, one or more compounds of the Formula Y, preferably selected from the group consisting of the Formulae Y1 and Y2, one or more compounds selected from the group consisting of the Formula XIV, one or more compounds selected from the group consisting of the Formulae III, IV, VI, XX, XXIII and XXIX or their subformulae, and one or more compounds selected from the group consisting of the Formulae LP2- 1, XVI, XVIIa, XVIIb, XVIIc or their subformulae. - The LC medium comprises one or more compounds of the Formulae L and S, preferably of the Formulae L-2 and S-2-4, S-2-7, LP1 and / or LP2, one or more compounds selected from the group consisting of the Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae, one or more compounds of Formula B, preferably selected from the group consisting of the Formulae B1, B2 and B3, one or more compounds of the Formula XIVd or their subformulae, one or more compounds selected from the group consisting of the Formulae III, IVc, VIb, XXa, XXIIIa and XXIXa or their subformulae, and one or more compounds selected from the group consisting of the Formulae LP1-1b, XVIb, XVIc, XVIIa, XVIIb, XVIIc or their subformulae. - Besides the compounds of the Formulae L and S, LP1 and / or LP2, the LC medium comprises further compounds selected from the group of the compounds of the Formula Z1, Z2, Z3, IV, LP1-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subformulae. - Besides the compounds of the Formulae L and S, LP1 and / or LP2, the LC medium comprises further compounds selected from the group of the compounds of the Formulae Z1, Z2, Z3, IV, LP2-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subformulae. - The proportion of compounds of the Formulae L and S or its subformulae in the LC medium is from 1 to 30%, very preferably from 2 to 25%, most preferably from 2 to 20% by weight. - The proportion of compounds of the Formulae Z1, Z2, Z3, Z4 and Z5 or their subformulae in the LC medium as a whole is from 10 to 65%, very preferably from 20 to 60% by weight. - The proportion of compounds of the Formula Y or its subformulae in the LC medium as a whole is from 0 to 15%, very preferably from 2 to 10% by weight. - The proportion of compounds of the Formula B or its subformulae in the LC medium as a whole is from 0 to 15%, very preferably from 2 to 10% by weight. - The proportion of compounds of the Formulae III, IV-VIII, XVIII-XXIII and XXVII-XXX in the LC medium as a whole is 30 to 60% by weight. - The proportion of compounds of the Formulae XIV and XV in the LC medium as a whole is 40 to 70% by weight. - The proportion of compounds of the Formulae XIV, XVIIa-c and XXXII in the LC medium as a whole is 0.5 to 15% by weight. 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, 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 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 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, 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 the Formula CnH2n+1-O-(CH2)m, in which n and m each, independently of one another, 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 R0 in Formulae II and III, the 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 constants K3(bend) (splay) compared with alkyl and alkoxy groups.4-Alkenyl groups, 3-alkenyl groups and the like generally give lower threshold voltages and lower compared 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. 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. 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 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. In a particularly preferred embodiment, the LC media according to the invention comprise compounds of the Formulae III to VIII (preferably IV and V) in denotes F, OCF3, OCHF2, OCH=CF2, OCF=CF2or OCF2-CF2H. A favourable synergistic action with the compounds of the Formulae L and S results in particularly advantageous properties. In particular, LC media comprising compounds of the Formulae L and S, III are distinguished by their low threshold voltage. 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 described above and below, by mixing one or more compounds of Formulae L and S and one or more compounds selected from the group consisting of the Formulae III, Z1, Z2, Z3, Z4, IV, VI, XIV, XVI, XVIIa, XVIIb, XVIIc, XX, XXIII, XXIX . The LC medium of the present invention may optionally comprise one or more polymerisable compounds. The polymerisable compounds are preferably selected from the Formula MRa-B1-(Zb-B2)m-RbM in which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meaning: 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) -, -O-, -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 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-, 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 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-, -(CF2)n1-, -CH=CH-, -CF=CF-, -C^C-, -CH=CH-COO-, a single bond, R0and R00each, independently of one another, denote H or alkyl having 1 to 12 C atoms, 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, -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 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-, P and Sp have the meanings indicated in the 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-, -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 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. Preferably, the proportion of polymerisable compounds in the LC medium, preferably selected from the 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 medium, like those selected from the 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 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. Preference is generally given to LC media which have a nematic LC phase, and preferably have no chiral liquid crystal phase. 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 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. 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 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 previous materials from the prior art. In particular, the combination of compounds of the Formulae L and S and, optionally, with compounds selected from the Formulae II-XXXII or their subformulae, leads to LC media which show a high average elastic constant Kavin combination with a low response time parameter K1and a low rotational viscosity. This enables fast energy saving LC displays, especially of the FFS, HB-FFS, XB-FFS and IPS mode. 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 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. The LC media according to the present 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 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. 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. 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 ^ 7.0 mPa.s / pN, very preferably ^ 5.0 mPa.s / pN, most preferably ^ 4.0 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 14.0 pN, most preferably at least 15.0 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 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 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 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 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 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. Measurements of the voltage holding ratio (VHR) [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 exhibit a significantly smaller decrease in the VHR on UV exposure than analogous LC media comprising cyanophenylcyclohexanes of the . 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. 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. 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. The LC media which can be used in accordance with the invention are prepared in a manner conventional per se, for example by mixing compounds of Claim 1 with one or more compounds of the Formulae II-XXXII or with further LC compounds 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, 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 art and described in the literature, such as, for example, polymerisation initiators, inhibitors, surface-active substances, 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 a preferred embodiment, the LC medium comprises one or more stabilisers selected from Table G. Preferably, the proportion of antioxidants and light stabilisers, like those of the 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. 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. 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. 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 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 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 respective abbreviations. in which n and m are each integers, and the three dots "…" are placeholders for other abbreviations from this table. The following abbreviations are used: n, m, k and l are, independently of one another, each an integer, preferably 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 is 1, 2, 3 or 4, preferably 2 or 4, m preferably is 1, 2, 3, 4 or 5, in the combination -Om is 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. * CFU 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. F F F PYP-n-m Particular preference is given to LC media which, besides the compounds of the Formulae L and S, comprise at least one, two, three, four or more compounds from Table E. 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 particular 0.01-5% by weight and particularly preferably 0.01-3% by weight of dopants. R / S-1011 Table G Antioxidants and light stabilizers, 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. O

[0002] O q = 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 Table H Table H shows illustrative reactive mesogenic compounds (RMs) which can be used in the LC media in accordance with the present invention. O RM-138

[0003] The LC media according to the invention may optionally comprise one or more polymerizable compounds, preferably selected from the polymerizable compounds of the 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-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 particularly preferred. 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 invention: 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 the Formulae SA-1 to SA-49, preferably from the Formulae SA-14 to SA-49, very preferably from the Formulae 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 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 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, ^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 longitudinal axes of the molecules at 20 °C and 1 kHz, ^^ dielectric anisotropy at 20 °C and 1 kHz, cl.p. or T(N,I) clearing point [°C], v flow viscosity measured at 20 °C [mm2·s-1], γ1rotational viscosity measured at 20 °C [mPa.s], K1elastic constant, "splay" deformation at 20 °C [pN], K2elastic constant, "twist" deformation at 20 °C [pN], K3elastic constant, "bend" deformation at 20 °C [pN], and VHR voltage holding ratio. 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.

[0004] Examples Example M1 A nematic LC medium is formulated as follows: Mixture Example S1 (stabilised with compound of Formula H-3-1) A nematic LC mixture according to the invention is formulated as follows: Compound of 1000 ppm Formula H-3-1 Addition of 1000 ppm of the compound of Formula H-3-1 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M1, without affecting the remaining physical properties of the mixture M1. 1 Example M2 A nematic LC medium is formulated as follows: .

[0005] Mixture Example S2 (stabilised with compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: 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 M2, without affecting the remaining physical properties of the mixture M2. 3 Example M3 A nematic LC medium is formulated as follows:

[0006] Mixture Example S3 (stabilised with compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M3, without affecting the remaining physical properties of the mixture M3. 3 Example M4 A nematic LC medium is formulated as follows: Mixture Example S4 (stabilised with compound of Formula H-3-5) A nematic LC mixture according to the invention is formulated as follows: Mixture M4 99.995 wt.-% Compound of 50 ppm Formula H-3-5 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 M4, without affecting the remaining physical properties of the mixture M4. 5 Example M5 A nematic LC medium is formulated as follows:

[0007] Mixture Example S5 (stabilised with compound of Formula H-3-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M5, without affecting the remaining physical properties of the mixture M5. 3 Example M6 A nematic LC medium is formulated as follows: Mixture Example S6 (stabilised with compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: 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 M6, without affecting the remaining physical properties of the mixture M6. Example M7 A nematic LC medium is formulated as follows: Mixture Example S7 (stabilised with compound of Formula H-3-4) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-4 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M7, without affecting the remaining physical properties of the mixture M7. 4 Example M8 A nematic LC medium is formulated as follows:

[0008] Mixture Example S8 (stabilised with compound of Formula H-3-2) A nematic LC mixture according to the invention is formulated as follows: 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 M8, without affecting the remaining physical properties of the mixture M8. 2 Example M9 A nematic LC medium is formulated as follows: Mixture Example S9 (stabilised with compound of Formula H-3-6) A nematic LC mixture according to the invention is formulated as follows: Mixture M9 99.995 wt.-% Compound of 50 ppm Formula H-3-6 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 M9, without affecting the remaining physical properties of the mixture. 6 Example M10 A nematic LC medium is formulated as follows:

[0009] Mixture Example S10 (stabilised with compounds of Formulae ST-2-3 and H-3-3) A nematic LC mixture according to the invention is formulated as follows: 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 M10, without affecting the remaining physical properties of the mixture. Example M11 A nematic LC medium is formulated as follows:

[0010] Mixture Example S11 (stabilised with compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: 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 M11, without affecting the remaining physical properties of the mixture M11. 2 Example M12 A nematic LC medium is formulated as follows: Mixture Example S12 (stabilised with compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M12, without affecting the remaining physical properties of the mixture M12. Mixture Example S12a (stabilised with compounds of Formulae ST-4-1, ST-4-2 and ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of the compounds of Formulae ST-4-1, ST-4-2 and ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M12, without affecting the remaining physical properties. ST-4-1 Example M13 A nematic LC medium is formulated as follows: Mixture Example S13 (stabilised with compound of Formula H-3-1) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of Formula H-3-1 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M13, without affecting the remaining physical properties of the mixture M13. Mixture Example S13a (stabilised with compounds of Formulae ST-4-2 and ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of the compounds of Formulae ST-4-2 and ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M13, without affecting the remaining physical properties. 1 Example M14 A nematic LC medium is formulated as follows: Mixture Example S14 (stabilised with compound of Formula H-3-5 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-5 and 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M14, without affecting the remaining physical properties of the mixture M14. Example M15 A nematic LC medium is formulated as follows: Mixture Example S15 (stabilised with compound of Formula H-3-7) A nematic LC mixture according to the invention is formulated as follows: Addition of 500 ppm of the compound of the Formula H-3-7 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M15, without affecting the remaining physical properties of the mixture M15. 7 Example M16 A nematic LC medium is formulated as follows:

[0011] -F Mixture Example S16 (stabilised with compound of Formula H-3-9) A nematic LC mixture according to the invention is formulated as follows: Addition of 500 ppm of the compound of the Formula H-3-9 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M16, without affecting the remaining physical properties of the mixture M16. 9 Example M17 A nematic LC medium is formulated as follows:

[0012] -F Mixture Example S17 (stabilised with compound of Formula H-3-1 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-1 and 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M17, without affecting the remaining physical properties of the mixture M17. Example M18 A nematic LC medium is formulated as follows: Mixture Example S18 (stabilised with compound of Formula H-3-1 and a Compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-1 and 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M18, without affecting the remaining physical properties of the mixture M18. Example M19 A nematic LC medium is formulated as follows: N -F Mixture Example S19 (stabilised with compound of Formula H-3-1 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-1 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M19, without affecting the remaining physical properties of the mixture M19. Example M20 A nematic LC medium is formulated as follows: F Mixture Example S20 (stabilised with compound of Formula H-3-3 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 700 ppm of the compound of the Formula H-3-3 and 500 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 M20. Example M21 A nematic LC medium is formulated as follows:

[0013] -2 Mixture Example S21 (stabilised with compound of Formula H-3-3 and a Compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 700 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 M21, without affecting the remaining physical properties of the mixture M21. Example M22 A nematic LC medium is formulated as follows:

[0014] Mixture Example S22 (stabilised with compound of Formula H-3-3 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 700 ppm of the compound of the Formula H-3-3 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M22, without affecting the remaining physical properties of the mixture M22. Example M23 A nematic LC medium is formulated as follows: Mixture Example S23 (stabilised with compound of Formula H-3-5 and a Compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-5 and 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M23, without affecting the remaining physical properties of the mixture M23. Example M24 A nematic LC medium is formulated as follows:

[0015] Mixture Example S24 (stabilised with compound of Formula H-3-5 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-5 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M24, without affecting the remaining physical properties of the mixture M24. Example M25 A nematic LC medium is formulated as follows:

[0016] Mixture Example S25 (stabilised with compound of Formula H-3-6 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-6 and 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M25, without affecting the remaining physical properties of the mixture M25. Example M26 A nematic LC medium is formulated as follows: Mixture Example S26 (stabilised with compound of Formula H-3-6 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-6 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M26, without affecting the remaining physical properties of the mixture M26. Example M27 A nematic LC medium is formulated as follows: Mixture Example S27 (stabilised with compound of Formula H-3-7 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-7 and 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M27, without affecting the remaining physical properties of the mixture M27. Example M28 A nematic LC medium is formulated as follows:

[0017] Mixture Example S28 (stabilised with compound of Formula H-3-7 and a Compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-7 and 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M28, without affecting the remaining physical properties of the mixture M28. Example M29 A nematic LC medium is formulated as follows:

[0018] Mixture Example S29 (stabilised with compound of Formula H-3-7 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 1000 ppm of the compound of the Formula H-3-7 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M29, without affecting the remaining physical properties of the mixture M29. Example M30 A nematic LC medium is formulated as follows: Mixture Example S30 (stabilised with compound of Formula H-3-9 and a Compound of Formula ST-1-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-9 and 500 ppm of the compound of the Formula ST-1-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M30, without affecting the remaining physical properties of the mixture M30. Example M31 A nematic LC medium is formulated as follows:

[0019] Mixture Example S31 (stabilised with compound of Formula H-3-9 and a Compound of Formula ST-2-3) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-9 and 500 ppm of the compound of the Formula ST-2-3 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M31, without affecting the remaining physical properties of the mixture M31. Example M32 A nematic LC medium is formulated as follows:

[0020] -T Mixture Example S32 (stabilised with compound of Formula H-3-9 and a Compound of Formula ST-4-2) A nematic LC mixture according to the invention is formulated as follows: Addition of 50 ppm of the compound of the Formula H-3-9 and 500 ppm of the compound of the Formula ST-4-2 significantly improves the VHR100after UV exposure compared to the non-stabilized mixture M32, without affecting the remaining physical properties of the mixture M32.

Claims

1. Patent Claims 1. Liquid-crystalline medium, characterised in that it comprises one or more compounds of Formula L Land one or more compounds of Formula S Sin which the individual substituents, on each occurrence identically or differently, and each, independently of one another, have the following meanings: A0, A1, A2each, independently of one another, denote phenylene-1,4-diyl, in which, in addition, one or two CH groups may be substituted by N and one or more H atoms may be substituted by halogen, CN, CH3, CHF2, CH2F, CF3, OCH3, OCHF2or OCF3, cyclohexane-1,4-diyl, in which, in addi- tion, one or two non-adjacent CH2groups may be substituted, independently of one another, by O and / or S and one or more H atoms may be substituted 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, tetra- hydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl; R1, R2, each, independently of one another, denote a H atom, a halogen R3and R4atom, -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 substitutedatoms 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; L1and L2each, independently of one another, denote H, F or Cl, wherein L1and L2do not simultaneously denote H; Y1and Y each, 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 directly to one another, preferably H or CH3;Z1and Z each, independently of one another, denote -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; k and l each, independently of one another, denote 0, 1, 2 or 3.

2. Medium according to Claim 1, characterized in that the one or more compounds of the Formula L are selected from one of the following: 12 3in which R1denotes an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-,, -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 substituted by a halogen atom; and R2denotes an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-,, -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 substituted by a halogen atom, and alternatively; R2is X0, wherein 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 Y1H or CH3.

3. Medium according to Claim 1 or 2, characterised in that the compounds of Formula S are selected from the group consisting of the following compounds: 1 2 3 4 1 56in which R3an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyl or an alkenyloxy group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, -CF2O-, -OCF2-, -CH=CH-,, -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 substituted by a halogen atom; R4a halogen atom, -CN, -SCN, -NCS, an alkyl or an alkoxy group having 1 to 6 C atoms or an alkenyloxy or an alkenyl group having 2 to 6 C atoms in which one or more CH2groups are optionally substituted by -C^C-, ,O atoms are not linked directly to one another, and in which one or more H atoms may be substituted by a halogen atom; and Y3each, independently from one another, denote a H atom or a methyl group, preferably a H atom; and L3to L8each, independently from one another, denote a H atom, F or Cl.

4. Liquid-crystalline medium according to at least one of Claims 1 to 3, characterised in that it comprises one or more compound of Formula S-2-4 and one or more compound of Formula S-2-7:4 7wherein Y2, Y3, R3and R4are as defined in Claim 1.

5. Medium according to one or more of Claims 1 to 4, characterized in that it comprises one or more compounds selected from the group consisting of the following formulae: II IIIin which the individual substituents have the following meanings:in whichR0, L1to L8and Y have the meanings given in Claim 1 for R1to R4, L1to L2and Y1,respectively; and 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 having 2 to 6 C atoms in which one or more H atoms has been substituted by a halogen atom.

6. Medium according to Claim 5, wherein the one or more compounds of Formula II are selected from the following subformulae:1 2 3 4 5 67in ch R0and X have the meanings given in Formula II.

7. Medium according to Claim 5, wherein the one or more compounds of Formula III are selected from the following subformulae: 1 2 3 4 5in ch R0and X have 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 consisting of the following formulae:Vin which R0, X0, L1, L2and Y have the meanings given in Claim 5; L3and L4each, independently of one another, have the meanings given for L1; Z0denotes -C2H4-, -(CH2)4-, -CH=CH-, -CF=CF-, -C2F4-, -CH2CF2-, -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-, or -OCF2-, in the Formulae V and VI also a single bond; ands denotes 0 or 1.

9. Medium according to one or more of Claims 1 to 8, characterised in that it comprises one or more compounds selected from the group consisting of the following formulaein which R0, L1to L4, X0and Y have the meanings given in Claim 5 for R0, L1, L2, X0and Y0, respectively.

10. Medium according to one or more of Claims 1 to 9, characterized in that it comprises one or more compounds selected from the group consisting of the following formulae:in which,in which R1and X have the meanings given in Claim 5 for R0and X0, respectively.

11. Liquid-crystalline medium according to one or more of Claims 1 to 10, characterised in that it comprises one or more compounds selected from the group of Formulae N1 and N2:independently of one another and, if occurs twice,also these independently of one another, denote,, , ,Z41and Z42independently 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, p denotes 0, 1 or 2, 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 optionallya 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;, if present, each, independently of one another, denote , ,R51and R52each, independently of one another, have the meanings of R41and R42;Z51to Z53each, independently of one another, have the meanings of Z41and Z42, andi and j each, independently of one another, denote 0 or 1, wherein or more, preferably one, of the aromatic rings may optionally be substituted by an alkyl group, preferably by methyl.

12. Medium according to Claim 11, characterized in that the compound of Formula N1 is represented by one of the following formulae:in which the individual substituents have the following meanings: "alkyl" and "alkyl*" each, independently from one another, an alkyl group having 1 to 6 C atoms; "alkenyl" and "alkenyl*" each, independently of one another, alkenyl group having 2 to 6 C atoms.

13. Medium according to Claim 11, characterised in that the compound of Formula N2 is represented by one of the following formulae:in whichR1and R2each, independently of one another, denote n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms, and L1denotes, H, F or Cl.

14. Medium according to one or more of Claims 1 to 13, characterized in that it comprises one or more compounds selected from the group consisting of the following formulae LP1 and LP2, preferably one or more compounds of Formula LP1 and one or more compounds of Formula LP2:in which the individual substituents have the following meanings: R0has one of the meanings given in for R1in the Formula L; R2denote an alkyl or an alkoxy group having 1 to 12 C atoms or an alkenyl or an alkenyloxy group having 2 or 12 C atoms in which one or more non-adjacent CH2groups are optionally substituted by -C^C-, -CF2O-,,, -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 substituted by a cycloalkyl or a cycloalkoxy group having 3 to 12 C atoms;X0has one of the meanings given inX0in the Formula II; denote H or CH3; and m and n denotes 0 or 1.

15. Medium according to one or more of Claims 1 to 14, characterised in that it comprises one or more compounds of the Formulae L, one or more compounds of the Formulae S and, optionally, one or more compounds selected from the group consisting of the Formulae Z1, Z2, Z3, Z4, Z5, III, IV, VI, XIV, XX, XII, XXIII, XXIX, XVI, XVIIa, XVIIb, XVIIc.

16. Medium according to one or more of Claims 1 to 15, characterized in that it comprises one or more compounds of the Formula L, one or more compounds of the Formula S and, optionally, one or more compounds selected from the group consisting of the Formulae LP1 and / or LP2.

17. Medium according to one or more of Claims 1 to 16, characterized in that it comprises one or more compounds of the Formula L, one or more compounds of the Formula S and, optionally, one or more compounds selected from the group consisting of the Formulae XXIX, XXX and XXVIIIa.

18. Process for the preparation of a liquid-crystalline medium according to one or more of Claims 1 to 17, characterised in one or more compounds of the Formula L and one or more compounds of the Formula S are mixed with one or more mesogenic compounds and optionally one or more polymerizable compounds and / or one or more additives.

19. Use of a liquid-crystalline medium according to one or more of Claims 1 to 17 for electro-optical purposes.

20. Electro-optical liquid-crystal display or an AR / VR headset containing a liquid- crystalline medium according to one or more of Claims 1 to 17.

21. Electro-optical liquid-crystal display according to Claim 20, 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-FFS, polymer stabilised SA-XB-FFS, positive VA or positive PS-VA display.

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