Liquid-crystalline medium

Abstract

The present invention relates to liquid-crystalline (LC) media and LC materials, and to energy-saving liquid-crystal displays (LCDs) comprising these media, in particular to gaming displays and augmented reality (AR) / virtual reality (VR) headsets addressed by 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

Technical Field

[0001] This invention relates to liquid crystal (LC) media and energy-efficient liquid crystal displays (LCDs) incorporating these media, exhibiting high contrast and improved transmittance, such as gaming displays, automotive displays, IT monitors, and augmented reality (AR) / virtual reality (VR) applications, addressed via active matrix, and particularly to TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, HB-FFS, XB-FFS, PS-FFS, SA-HB-FFS, SA-XB-FFS, polymer-stabilized SA-HB-FFS, polymer-stabilized SA-XB-FFS, positive VA, or positive PS-VA type LC displays. The LC media of this invention exhibits positive dielectric anisotropy. Background Technology

[0002] Liquid crystal displays (LCDs) are used to display information in many fields. LCDs are used for both direct-view displays and projection displays. The electro-optic modes used are, for example, twisted nematic (TN), super-twisted nematic (STN), optically compensated bending (OCB), and electro-controlled birefringence (ECB) modes, as well as their various variations and other modes. All of these modes utilize an electric field generated substantially perpendicular to the substrate and the LC layer.

[0003] In addition to these modes, there are also electro-optic modes that utilize an electric field that is substantially parallel to the substrate or LC layer. For example, WO91 / 10936 A1 discloses an LC display in which electrical signals are generated in such a way that the electric field has an effective component parallel to the LC layer, and it has since been known as an "in-plane switching" (IPS) display. The principle of operating such a display is described, for example, by RA Soref in the Journal of Applied Physics, Vol. 45, No. 12, pp. 5466-5468 (1974).

[0004] An IPS display comprises an LC layer between two substrates with planar orientation, wherein two electrodes are disposed on only one of the two substrates and preferably have an interdigitated comb-like structure. When a voltage is applied to the electrodes, an electric field with an effective component parallel to the LC layer is generated between the electrodes. This causes the liquid crystal molecules to reorient in the layer plane.

[0005] For example, EP0588568 A2 discloses various possible forms for electrode design and IPS display addressing. DE19824137 A1 similarly describes various implementations of such IPS displays.

[0006] Liquid crystal materials used in this type of IPS display are described, for example, in DE19528104 A1.

[0007] Furthermore, so-called “edge field switching” (FFS) displays have been reported (see, in particular, SH Jung et al., Jpn. J. Appl. Phys., Vol. 43, No. 3, 2004, 1028), which contain two electrodes on the same substrate, one constructed in a comb-like manner and the other unstructured. This generates a strong so-called “edge field,” that is, a strong electric field near the edge of the electrode, and an electric field with strong vertical and horizontal components throughout the cell. FFS displays exhibit low contrast viewing angle dependence. FFS displays typically comprise a liquid crystal medium with positive dielectric anisotropy and an alignment layer, typically polyimide, which provides planar alignment for the molecules of the liquid crystal medium.

[0008] IPS and FFS electro-optical liquid crystal displays are particularly suitable for modern desktop monitors, televisions, and multimedia applications. The LC medium according to the invention is preferably used in this type of display. Typically, dielectrically positive LC media with a fairly low dielectric anisotropy value are used in FFS displays, but in some cases, LC media with a dielectric anisotropy of only about 3 or even less are also used in IPS displays.

[0009] Further improvements have been achieved through the HB-FFS mode. One of the unique features of the HB-FFS mode compared to traditional FFS technology is its ability to achieve higher transmittance, which allows the panel to be operated with less energy consumption.

[0010] Another recently developed mode is the XB-FFS mode, in which the LC medium additionally contains a polar liquid crystal compound with low dielectric anisotropy.

[0011] Liquid crystal compositions suitable for LCDs, especially FFS and IPS displays, are known in the prior art, for example, from JP07-181 439 (A), EP 0 667 555 A1, EP 0 673 986 A2, DE 195 09 410 A1, DE 195 28106 A1, and DE 195 28 107 A1. However, these compositions have certain disadvantages. Among other drawbacks, most of them result in unfavorable long addressing times, insufficient resistivity values, and / or require excessively high operating voltages. Therefore, improvements in both operational performance and shelf life are needed.

[0012] FFS and IPS displays can operate as active matrix displays (AMD) or passive matrix displays (PMD). In the case of an active matrix display, individual pixels are typically addressed using integrated, non-linear active elements, such as thin-film transistors (TFTs), while in the case of a passive matrix display, individual pixels are typically addressed using multiplexing methods known in the art.

[0013] Preferably, the display according to the invention is addressed by an active matrix, and more preferably by a TFT matrix. However, the LC medium according to the invention can also be advantageously used in displays having other known addressing methods.

[0014] Typical applications of IPS and FFS technologies include monitors, laptops, televisions, mobile phones, and tablet PCs.

[0015] Both IPS and FFS technologies have certain advantages over other LCD technologies, such as vertical alignment (VA) technology and wide viewing angle dependence of contrast.

[0016] The availability of other LC media and their application in displays with high transmittance, good black levels, and high contrast are core challenges for modern FFS and IPS applications. Furthermore, modern applications require good reliability and fast addressing times. Compared to other LCD technologies such as vertical alignment (VA) technology, both IPS and FFS technologies offer certain advantages, such as a wide viewing angle dependence in contrast.

[0017] However, there is still a need in the field for more liquid crystal media and their use in displays with high transmittance, good black states and high contrast, especially in FFS and IPS applications with good low-temperature stability and fast addressing time. Summary of the Invention

[0018] Therefore, the object of the present invention is to provide a liquid crystal medium, particularly for FFS, HB-FFS and IPS displays, but also for TN, positive VA or STN displays, especially for active matrix displays such as those addressed by TFTs, which does not exhibit the aforementioned disadvantages or exhibits the aforementioned disadvantages only to a lesser extent, and preferably has high resistivity, low threshold voltage, suitable dielectric anisotropy, good low temperature stability (LTS), fast response time and low rotational viscosity, enabling high brightness and high transmittance, and also exhibits favorable reliability and stability.

[0019] Another object of the present invention is to provide a display that has high contrast, high optical transmittance in an optical state, fast addressing time, and advantageous stability, particularly at low and high temperatures. Other objects of the invention will be apparent to those skilled in the art from the following detailed description.

[0020] It has been advantageously recognized that by using a dielectric constant ε that has positive dielectric anisotropy and also has an increased dielectric constant perpendicular to the longitudinal axis of the liquid crystal molecules... ⊥ The liquid crystal medium can achieve high brightness, as seen in displays using the HB-FFS mode. This can be advantageously achieved by adding a limited amount of liquid crystal medium with high ε... ⊥ This is achieved by using liquid crystal compounds with negative dielectric anisotropy, while maintaining the positive dielectric anisotropy of the entire medium.

[0021] However, adding high ε ⊥ The compound may have some drawbacks. For example, this addition can lead to a higher rotational viscosity γ1 value, and thus a higher ratio γ1 / K2 of the rotational viscosity γ1 to the elastic constant K2 of the twisted deformation, which results in a higher response time. K2 is approximately proportional to the elastic constant K1 of the twisted deformation, where the value of K2 is typically about half the value of K1. Therefore, K2 can be appropriately determined by measuring γ1 and K1. It is also recognized that the reliability of such mixtures (especially HB-FFS mixtures), particularly the voltage retention rate (VHR), may also be affected compared to conventional FFS mixtures.

[0022] Surprisingly, the medium according to the invention advantageously exhibits a relatively high ε. ⊥ It also possesses low rotational viscosity and a low ratio of γ1 / K2 to γ1 / K1, enabling high optical transmittance and fast response time in displays using the liquid crystal medium described and claimed herein. Furthermore, displays utilizing the medium according to the invention advantageously exhibit particularly high contrast and excellent reliability. In this regard, adding one or more stabilizers to the medium can advantageously contribute to improved reliability and stability, particularly for light, especially UV light and heat, as well as under extreme loads. This stabilizing effect can be unexpectedly further improved by adding at least two different stabilizers to the liquid crystal medium described and claimed herein.

[0023] According to the present invention, a dielectric constant ε exhibiting moderate positive dielectric anisotropy and simultaneously exhibiting an increased dielectric constant perpendicular to the longitudinal axis of the liquid crystal molecules can be provided. ⊥The liquid crystal medium can advantageously maintain a low rotational viscosity and a low ratio γ1 / K1. This enables the provision of liquid crystal displays with high brightness and transmittance, as well as short response times, especially HB-FFS, FFS, and IPS models.

[0024] EP 4261267 A1 describes dielectric negative LC dielectrics, which in particular comprise a combination of the following components:

[0025]

[0026] It has now been surprisingly discovered that FFS-type LCs using liquid crystals with positive dielectric anisotropy can be realized using specially selected liquid crystal media. These media are characterized by a particularly advantageous combination of physical properties. The most decisive of these is the high ε leading to improved optical transmittance. ⊥ and ε ⊥ In addition, they exhibit one or more high elastic constant values, particularly through high K1 and their excellent rotational viscosity γ1 to low elastic constant K1 ratio γ1 / K1.

[0027] The liquid crystal medium according to the invention preferably has a positive dielectric anisotropy Δε, preferably in the range of 1.5 or greater, more preferably in the range of 1.8 or greater to 10.0 or less, and most preferably in the range of 2.0 or greater to 8.0 or less.

[0028] The liquid crystal medium according to the present invention preferably has a dielectric constant ε perpendicular to the director of the liquid crystal molecules of 2.0 or greater, more preferably 2.5 or greater, and even more preferably 3.0 or greater. ⊥ .

[0029] The liquid crystal medium according to the present invention preferably has a dielectric ratio ε of 0.65 or greater, more preferably 0.75 or greater. ⊥ / Δε.

[0030] In particular, it has now been unexpectedly discovered that LC media according to the invention, containing a compound of formula I and one or more compounds selected from formulas P, S, and B, exhibit several significant improvements, especially when used in FFS mode displays, such as a high average elastic constant K resulting in excellent optical transmittance. av With high ε ⊥ and ε ⊥ The combination of / Δε. Furthermore, the LC medium according to the invention has a high clearing point, excellent low-temperature stability (LTS), and provides optimal motion picture quality and improved overall image quality, particularly high contrast.

[0031]

[0032]

[0033] Each of the substituents is as described in claim 1.

[0034] This invention relates to LC media, characterized by comprising one or more compounds of formula I.

[0035]

[0036] Each substituent has the following meaning:

[0037] R 1 and R 2 Each of the above independently represents an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , -O-, -CO-O- or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl or cycloalkoxy groups having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0038] R 3 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0039] L 1 and L 2 Each of them independently represents F, Cl, CF3, or CHF2; preferably, L 1 and L 2 Both represent F; and

[0040] One or more compounds selected from compounds of formulas P, S, and B:

[0041]

[0042] in

[0043] and Each time it appears, it is independent of each other.

[0044]

[0045] R 0 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , -O-, -CO-O- or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl or cycloalkoxy groups having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0046] L 1 and L 2 H or F can be represented independently of each other, with L being preferred. 2 F represents

[0047] Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0048] X 0 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 6 carbon atoms, or halogenated alkenyl or alkenyloxy groups having 2 or 6 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2, or -CF3, with F, -CF3, -CHF2, -OCHF2, or -OCF3 being particularly preferred.

[0049] Z 3 This indicates -CH2CH2-, -CF2CF2-, -COO-, -OCO-, trans -CH=CH-、 trans- CF = CF-, -CH2O-, -OCH2- or a single bond, preferably -CH2CH2-, -COO-, trans- CH=CH- or a single bond, with -COO- being the most preferred. trans- CH=CH- or a single bond, and

[0050] n represents 0, 1, 2 or 3, preferably 1, 2 or 3, and especially preferably 1;

[0051]

[0052] Each substituent, when appearing in the same or different manner, and independently of each other, has the following meaning:

[0053] express

[0054] R 1 and R 2 Each of the following independently represents an H atom, a halogen atom, an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenoxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0055] L 1 To L 4 Each can be represented independently of the other, such as H, F, or Cl.

[0056] Y 1 To Y 3 Each of the groups independently represents an H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0057] Z 1 This indicates -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;

[0058] k represents 0, 1, 2, or 3;

[0059]

[0060] Each substituent has the following meaning:

[0061] express

[0062] R 21 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0063] X 3 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 3 carbon atoms, or halogenated alkenyl or alkenyloxy groups having 2 or 3 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2, or -CF3, with F, Cl, -O-CH=CF2, -OCHF2, or -OCF3 being particularly preferred.

[0064] L 1 and L 2 Each can be represented independently as F, Cl, CF3, or CHF2;

[0065] L 3 and L 4 Each can be represented independently of the other, either H or F;

[0066] Z represents a single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -COO-, -OCO-, -C2F4-, -CF=CF-, -CH=CHCH2O;

[0067] Y represents S or O, CH2, CH2CH2, CH2O, OCH2, CH=CH;

[0068] l can be 0 or 1.

[0069] The LC media according to the invention are particularly suitable for energy-efficient LC displays in FFS, HB-FFS, XB-FFS and IPS modes, as well as augmented reality (AR) / virtual reality (VR) applications and their polymer-stable variants.

[0070] The present invention also relates to the use of LC media for electro-optical purposes as described in the context, particularly for LC displays, shutter glasses, LC windows, and 3D applications, preferably for 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-stabilized SA-HB-FFS, polymer-stabilized SA-XB-FFS, positive VA, and positive PS-VA displays, and very preferably for use in FFS, HB-FFS, IPS, PS-HB-FFS, and PS-IPS displays.

[0071] The present invention also relates to an electro-optic LC display comprising an LC medium as described in the context, particularly 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-stabilized SA-HB-FFS, polymer-stabilized SA-XB-FFS, positive VA or positive PS-VA displays, preferably FFS, HB-FFS, IPS, PS-HB-FFS or PS-IPS displays.

[0072] In this application, all atoms also include their isotopes. In some embodiments, one or more or even all hydrogen atoms (H) may optionally be replaced by deuterium (D).

[0073] In equations I, P, S, and B, if R 1 R 2 R 0 Or R 21 The symbol represents an alkyl and / or alkoxy group, which can be straight-chain or branched. It is preferably straight-chain, having 2, 3, 4, 5, or 6 carbon atoms, and preferably represents ethyl, propyl, butyl, pentyl, hexyl, ethoxy, propoxy, butoxy, pentoxy, or hexoxy, as well as methyl and methoxy. 1 R 2 R 0 Or R 21 Preferably, it represents a straight-chain alkyl group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.

[0074] The oxane preferably represents straight-chain 2-oxapropyl (=methoxymethyl), 2-(=ethoxymethyl) or 3-oxabutyl (=2-methoxyethyl), 2-, 3- or 4-oxapentyl, 2-, 3-, 4- or 5-oxahexyl.

[0075] If R 1 R 2 R 0 Or R 21 If it represents an alkoxy or oxaalkyl group, it may also contain one or more additional oxygen atoms, provided that the oxygen atoms are not directly connected to each other.

[0076] In another preferred embodiment, R 1 R 2 R 0 Or R 21 One or more of the following are selected from the group: , , , , , , , -S 1 -F, -OS 1 -F, -O-S1-O-S2, where S 1 It is C 1-12 Alkylene or C 2-12 imidene group, and S 2 It is H, C 1-12 Alkyl or C 2-12 Alkenyl, and very preferably, R 1 R 2 R 0 Or R 21 One or more of the following are selected from the group: , , , , , , , , , , , , , -OCH2OCH3, -O(CH2)2OCH3, -O(CH2)3OCH3, -O(CH2)4OCH3, -O(CH2)2F, -O(CH2)3F, -O(CH2)4F.

[0077] If R 1 R 2 R0 Or R 21 The term "alkenyl" can be either straight-chain or branched. It is preferably straight-chain and has 2 to 10 carbon atoms. Therefore, it particularly represents 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, hep-1-, -2-, -3-, -4-, -5-, -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.

[0078] If R 1 R 2 R 0 Or R 21 If the alkyl or alkenyl group is at least monosubstituted with a halogen, the group is preferably straight-chain, and the halogen is preferably F or Cl. In the case of multiple substitution, the halogen is preferably F. The resulting group also includes a perfluorinated group. In the case of monosubstituted substitution, the fluorine or chlorine substituent can be at any desired position, but is preferably at the ω-position. R 2 Preferably, it is an alkyl, alkenyl, alkoxy, or alkenyloxy group having 1 to 6 carbon atoms, wherein R 2 Ethoxy group is particularly preferred.

[0079] Z in formulas P, S and B 3 Z 1 Z is particularly preferred to represent -CH2O-, -OCH2-, -C2H4-, -CH=CH- or a single bond, with a single bond being the most preferred.

[0080] Further preferred compounds are those of formulas I and P, S and B, and B, wherein R 1 R 2 R 0 and R 21 Each of the above can be independently represented as an alkyl, alkenyl, or alkoxy group having up to 8, preferably up to 5, carbon atoms.

[0081] Preferred groups R in formulas I, P, and S 3 and Y 0 Y 1 Y 2 Y 3 Each represents an H atom, or an alkyl or alkenyl group having at most 3 C atoms. Very particularly preferably, R 3 and Y 0 Y 1 Y 2 Y 3It is a methyl group or a hydrogen atom.

[0082] Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, and n-octyl.

[0083] Preferred alkenyl groups are, for example, vinyl, propenyl, butenyl, and pentenyl.

[0084] Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, and n-octoxy.

[0085] Halogens are preferably represented by F or Cl, with F being the most preferred.

[0086] The particularly preferred compounds of formula I are those selected from the following formulas:

[0087]

[0088]

[0089]

[0090]

[0091] in

[0092] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0093] alkenyl represents a straight-chain alkenyl group having 2 to 6 carbon atoms, and

[0094] R 23 The symbol represents an H atom or an alkyl group having 1 to 3 C atoms, preferably H or CH3, and particularly preferably H.

[0095] The most preferred compounds of formula I particularly include one or more of the following:

[0096]

[0097]

[0098]

[0099]

[0100]

[0101]

[0102]

[0103]

[0104]

[0105]

[0106] In a further preferred embodiment, a compound of formula I can be used:

[0107]

[0108]

[0109]

[0110]

[0111] Compounds of Formula I can be prepared by methods known to those skilled in the art and described in standard organic chemistry works, such as Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Thieme-Verlag, Stuttgart.

[0112] The proportion of the compound of formula I or preferred sub-formula I-2, more preferably sub-formula I-2-6 in the LC medium is preferably 0.5-20% by weight, very preferably 1-15% by weight, and most preferably 2-10% by weight.

[0113] In some embodiments, one or more compounds of formula P may be selected from the group consisting of the following formulas:

[0114]

[0115] in

[0116] R 0 This indicates an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl, or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0117] X 0 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 3 carbon atoms, or halogenated alkenyl or alkenyloxy groups having 2 or 3 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2, or -CF3, with F, -CF3, -CHF2, -OCHF2, or -OCF3 being particularly preferred.

[0118] L 1 To L 4 Each can be represented independently of the other, such as H, F, or Cl.

[0119] Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0120] Z 0 The terms -C2H4-, -(CH2)4-, -CH=CH-, -CF=CF-, -C2F4-, -CH2CF2-, -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-, or -OCF2- are represented, and in formulas V and VI, they also represent single bonds; and

[0121] s represents 0 or 1.

[0122] Compounds of formula IV are preferably selected from the following formula:

[0123]

[0124] Where R 0 and X 0 It has the meaning shown in Formula IV.

[0125] R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 Preferred values ​​are F, CF3, CHF2, OCHF2, or OCF3, and also OCF=CF2, OCHFCF3, or Cl.

[0126] Compounds of formula IVa are preferably represented by the following sub-formulas:

[0127]

[0128] Where R0 It has the meaning shown in Formula IV.

[0129] Compounds of formula IVb are preferably represented by the following formula:

[0130]

[0131] Compounds of formula IVc are preferably represented by the following sub-formulas:

[0132]

[0133] Where R 0 It has the meaning shown in Formula IV, and is preferably an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, and is very preferably ethyl, propyl, butyl, or pentyl.

[0134] Particularly preferred compounds of formulas IVa, IVc, and IVd are selected from one or more of the following:

[0135]

[0136]

[0137]

[0138]

[0139]

[0140] Compounds of formula IVa to IVd are preferably used in LC media in an amount of 0-20% by weight, particularly preferably 0-10% by weight.

[0141] Compound V is preferably selected from the following sub-formulas:

[0142]

[0143]

[0144] Where R 0 and X 0 It has the meaning shown in Equation V.

[0145] R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 The preferred representations are F, CHF2, and OCF3, as well as OCHF2, CF3, OCF=CF2, OCHFCF3, and OCH=CF2.

[0146] The particularly preferred compound of formula V is selected from one or more of the following:

[0147]

[0148]

[0149]

[0150]

[0151]

[0152]

[0153]

[0154]

[0155] Compounds of formula VI are preferably selected from the following sub-formulas:

[0156]

[0157] Where R 0 and X 0 It has the meaning shown in Equation V.

[0158] R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 The preferred representation is F, and other options include OCF3, CF3, CHF2, CF=CF2, OCHF2, OCHFCF3, and OCH=CF2.

[0159] The particularly preferred compound of formula VI is selected from one or more of the following:

[0160]

[0161]

[0162]

[0163]

[0164] Compounds of formula VII are preferably selected from the following sub-formulas:

[0165]

[0166] Where R 0 and X 0It has the meaning shown in Equation VII.

[0167] R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 The preferred representations are F, CF3, and CHF2, and also OCF3, OCHF2, OCHFCF3, and OCH=CF2.

[0168] The particularly preferred compound of formula VII is selected from one or more of the following:

[0169]

[0170] In some embodiments, one or more compounds of formula P may be selected from the group consisting of the following formulas:

[0171]

[0172] Where R 0 X 0 Y 0 and L 1-4 Each of them independently has one of the meanings shown in equations IV to VIII above.

[0173] The preferred XVIII compound may be selected from one of the following:

[0174]

[0175]

[0176]

[0177] The preferred compound of formula XIX may be selected from one of the following:

[0178]

[0179]

[0180]

[0181]

[0182] The preferred compound of formula XX may be selected from one of the following:

[0183]

[0184]

[0185]

[0186]

[0187]

[0188]

[0189]

[0190] The preferred XXI compound may be selected from one of the following:

[0191]

[0192]

[0193]

[0194]

[0195]

[0196]

[0197]

[0198] The preferred compound of formula XXII may be selected from one of the following:

[0199]

[0200]

[0201]

[0202]

[0203] The preferred compound of formula XXIII may be selected from one of the following:

[0204]

[0205]

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212] LC media may further optionally contain one or more compounds of the following formula:

[0213]

[0214] in

[0215] express

[0216] And R 0 X 0 and Y 0 Each has the following characteristics for R in equations IV to VIII respectively. 0 X 0 and Y 0 The meaning shown is as follows. R 1 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 Preferred components include F, CF3, CHF2, OCHF2, or OCF3, as well as OCF=CF2, OCHFCF3, or Cl. F and Y are highly preferred. 0 Preferably, H is represented. The LC medium according to the invention particularly preferably comprises one or more compounds of formula XXIX, wherein X... 0 The preferred option is represented by F.

[0217] The preferred compound of formula XXVII may be selected from one of the following:

[0218]

[0219] The preferred compound of formula XXVIII may be selected from one of the following:

[0220]

[0221] In some embodiments, the LC medium according to the present invention may comprise one or more compounds of formula XXIXa or XXXa:

[0222]

[0223] Where R 1 and Y 0 For R in formula XXIX 0 and Y 0 The meaning shown, and preferably R 1The term indicates an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred.

[0224] The preferred compound of formula XXIX may be selected from one of the following:

[0225]

[0226] The preferred compound of formula XXX may be selected from one of the following:

[0227]

[0228]

[0229]

[0230]

[0231] One or more compounds of formula XXVII-XXX are preferably used in the LC medium according to the invention in an amount of 0-20% by weight, particularly preferably 1-15% by weight. Particularly preferred LC media contain at least one compound of formula XXIX and / or formula XXX.

[0232] One or more compounds of formula XXIXa and / or XXXa are preferably used in the LC medium according to the invention in an amount of 1-15% by weight, particularly preferably 2-10% by weight.

[0233] LC media may further comprise one or more of the following pyrimidine or pyridine compounds:

[0234]

[0235] Where R 1 X 0 and Y 0 Each has the following properties in Equation II for R 0 X 0 and Y 0 The meaning shown is as follows. R 1 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 Preferred ingredients include F, CF3, CHF2, OCHF2, or OCF3, as well as OCF=CF2, OCHFCF3, or Cl. F and Y are highly preferred. 0 Preferably, H is represented. The medium according to the invention may optionally comprise one or more compounds of formula XXXI-1, wherein X... 0Preferred to be F. One or more compounds of formula XXXI-1 to XXXI-3 may be used in the LC medium according to the invention in an amount of 1-20% by weight, particularly preferably 1-15% by weight.

[0236] In a preferred embodiment, the LC medium may further comprise one or more compounds of formula S:

[0237]

[0238] Each substituent, when appearing in the same or different manner, and independently of each other, has the following meaning:

[0239] express

[0240] R 1 and R 2 Each of the following independently represents an H atom, a halogen atom, an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenoxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0241] L 1 To L 4 Each can be represented independently of the other, such as H, F, or Cl.

[0242] Y 1 To Y 3 Each of the groups independently represents an H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0243] Z 1This indicates -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;

[0244] k represents 0, 1, 2, or 3.

[0245] Further preferred are S-compounds in which k represents 0, 1, or 2, particularly preferred are S-compounds in which k represents 0 or 1. Further preferred are S-compounds in which k represents 0, 1, or 2, preferably 1 or 2, very particularly preferred are S-compounds in which k represents 1.

[0246] A in formula S 1 Particularly preferred is phenylene-1,4-diyl, which may also be mono- or poly-substituted with F, and also cyclohexane-1,4-diyl, cyclohexene-1,4-diyl, tetrahydropyran-2,5-diyl or 1,3-dioxane-2,5-diyl.

[0247] Z in formula S 1 The preferred expression is -CF2O-, -OCF2- or a single bond, with a single bond being particularly preferred.

[0248] Furthermore, the preferred compound is of formula S, wherein R 1 and R 2 Each of them independently represents a halogen, or an alkyl, alkenyl, or ynyl group having up to 8, preferably up to 5, carbon atoms, each optionally substituted with a halogen, particularly with F.

[0249] The group R in the particularly preferred formula S 1 and R 2 The group represents H, a halogen, or an alkyl, alkenyl, alkynyl, or alkoxy group having up to 12, preferably up to 8, carbon atoms, each optionally substituted with a halogen, particularly with F, and especially preferably H, F, or an alkyl, alkenyl, or alkynyl group having up to 8 carbon atoms. Preferably, at least one group is not H, and particularly preferably, the group R. 1 and R 2 Neither of them are H. R 1 Very particularly preferred is an alkyl group. R 2 Further preferred are H, alkyl, alkyl substituted with at least one fluorine, or fluorine. Very particularly preferred is R. 1 It is an alkyl group and R 2 It is H or an alkyl group. R 1 R 2 Each, independently and very particularly preferably, represents a non-branched alkyl group having 1 to 5 carbon atoms. If R1 and R 2 If the substituted alkyl, alkoxy, alkenyl, or alkynyl group is represented by two R groups, then... 1 and R 2 The total number of C atoms in the sample is preferably less than 10.

[0250] Preferred alkyl groups are, for example, methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, and n-octyl.

[0251] Preferred alkenyl groups are, for example, vinyl, propenyl, butenyl, and pentenyl.

[0252] Preferred alkynyl groups are, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, and octyynyl.

[0253] Preferred alkoxy groups are, for example, methoxy, ethoxy, n-propoxy, n-butoxy, n-pentoxy, n-hexoxy, n-heptoxy, and n-octoxy.

[0254] Halogens are preferably represented by F or Cl, with F being the most preferred.

[0255] The particularly preferred S-type compounds are those selected from the following formulas:

[0256]

[0257] Where Y 1 Y 2 R 1 and R 2 and L 1 To L 6 It has the meaning shown in the general formula S.

[0258] In the preferred embodiment,

[0259] R 1 It is an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms;

[0260] R 2The halogen atom, -CN, -SCN, -NCS, alkyl or alkoxy having 1 to 6 carbon atoms, or alkenoxy or alkenyl having 2 to 6 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms;

[0261] Y 1 and Y 2 Each of them independently represents either a H atom or a methyl group, preferably a H atom; and

[0262] L 1 To L 6 Each can be used independently to represent a H atom, F atom, or Cl atom.

[0263] R 1 and R 2 It can represent an alkyl or alkoxy group with 1 to 12 carbon atoms that is optionally fluorinated, an alkenyl or alkynyl group with 2 to 12 carbon atoms that is optionally fluorinated, or a cycloalkyl group with 3 to 12 carbon atoms that is optionally fluorinated. 1 and Y 2 Preferably, it contains H atoms or methyl groups.

[0264] Particularly preferred are alkyl, alkenyl, or ynyl groups with up to 5 carbon atoms that are optionally fluorinated. L in formulas S-1-1 to S-1-6 2 The preferred representation is F. In equations S-1-4 to S-1-6, L 3 To L 6 H is the preferred option.

[0265] In a particularly preferred embodiment, the compound of formula S is selected from the following structures:

[0266]

[0267] Where R 1 It has the same meaning as in the general formula S;

[0268] R 2 This indicates a straight-chain or branched alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl, alkenoxy, or alkoxyalkyl group having 2 to 6 carbon atoms, or a cycloalkyl or cycloalkoxy group having 3 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , -O-, -CO-O-, or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be substituted with halogen atoms; or,

[0269] R 2 For X 0 ,in

[0270] X 0 It is an F atom or an alkyl or alkoxy group having 1 to 3 C atoms or an alkenyl or alkenoxy group having 2 or 3 C atoms, wherein one or more H atoms are replaced by F atoms; and

[0271] L 1 and L 2 Both represent F atoms, or L atoms. 1 Represents F atoms and L 2 Represents the H atom; and

[0272] Y 1 and Y 2 Each of them independently represents a H atom or a straight-chain or branched alkyl group having 1 to 3 C atoms.

[0273] The LC media according to the invention, which have particularly advantageous properties, can be obtained from compounds of the following general formula S:

[0274]

[0275]

[0276]

[0277]

[0278]

[0279]

[0280]

[0281]

[0282]

[0283]

[0284] Where Y 1 Y 2 R 1 and R 2As defined above.

[0285] In a preferred embodiment of the present invention, the LC medium comprises one or more compounds of formula S-2-4 and / or one or more compounds of formula S-2-7.

[0286] In yet another preferred embodiment, the LC medium comprises a compound of formula S:

[0287]

[0288]

[0289]

[0290]

[0291]

[0292]

[0293] Where n and m each independently represent 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, preferably 2, 3, 4, 5 or 6.

[0294] The most preferred S-type compound specifically includes one or more of the following:

[0295]

[0296]

[0297]

[0298]

[0299]

[0300]

[0301] As another possibility, compounds of formula S can be used:

[0302]

[0303]

[0304]

[0305]

[0306]

[0307] As another possibility, compounds of formula S can be used:

[0308]

[0309]

[0310]

[0311]

[0312]

[0313]

[0314] Compounds of formulas S-3-9-2 and S-3-5-1 are highly preferred.

[0315] The proportion of the compound of formula S or its sub-formulas in the LC medium can be 0-40% by weight, very preferably 1-30% by weight, and most preferably 2-20% by weight.

[0316] Compounds of general formula B may preferably be selected from the following sub-formulas:

[0317]

[0318] Among them, Y and L 1 L 2 R 21 and X 3 It has the meaning given in equation B.

[0319] Preferred compounds of formula B3 are selected from the following sub-formulas:

[0320]

[0321] Where R 1 It has one of the meanings given in Formula B3, and preferably represents a straight-chain alkyl group having 1 to 6 carbon atoms, very preferably methyl, ethyl, propyl, butyl, pentyl or hexyl, more preferably ethyl or propyl, most preferably propyl, and

[0322] X 1 It has one of the meanings given in Formula B3, and preferably represents CF3, CHF2, OCHF2 or OCF3.

[0323] Preferred compounds of formula B3 are selected from the following sub-formulas:

[0324]

[0325] Where R 1It has one of the meanings given in Formula B3, and preferably represents a straight-chain alkyl group having 1 to 6 C atoms, very preferably methyl, ethyl, propyl, butyl, pentyl or hexyl, more preferably ethyl or propyl, and most preferably propyl.

[0326] The most preferred compounds are those of formulas B3-1-1 and B3-2-2.

[0327] In a preferred embodiment, the LC medium contains one or more compounds of formula B or its subformulas B1, B2, B3, B1-1, B1-2, B2-1, B2-2, B2-3, B3-1, B3-2, B3-1-1, B3-1-2, B3-2-1, and B3-2-2, wherein the dibenzofuran or dibenzothiophene group is substituted with a methyl or methoxy group, preferably with a methyl group, preferably at the p-position of the substituent F, and very preferably at the p-position of the substituent F (i.e., at the terminal group R). 2 or X 1 of m -Bit).

[0328] The proportion of the compound of formula B3 or its sub-formula in the LC medium is preferably 1-20% by weight, and very preferably 1-10% by weight.

[0329] Preferably, the LC medium contains one, two, or three compounds of formula B3 or its derivatives.

[0330] Preferably, the total proportion of the compound of formula B or its sub-formulas in the LC medium is 2-25% by weight, very preferably 3-20% by weight.

[0331] LC media may additionally contain one or more compounds selected from the following formulas:

[0332]

[0333] In a preferred embodiment, the LC medium may additionally comprise one or more compounds selected from formulas II and III below:

[0334]

[0335] Each substituent independently, and each time it appears, has the same or different meaning as follows:

[0336] express

[0337] express

[0338] R 0 Having Equation I for R 1 One of the meanings given is

[0339] X 0 The symbol represents a halogen atom, -CN, -SCN, -NCS, or an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenoxy group having 2 to 6 carbon atoms, wherein one or more H atoms are substituted with halogen atoms, preferably F, CF3, CHF2, OCHF2, or OCF3.

[0340] L 1-8 Each independently represents H, F, or Cl, and

[0341] Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3.

[0342] Preferred compounds of formulas II and III are those in which Y 0 Those that are H.

[0343] Further preferred compounds of formulas II and III are those in which R 0 This indicates an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred. 0 It can be F, CF3, CHF2, OCHF2 or OCF3, or OCF=CF2, OCHFCF3 or Cl, with F being the most preferred.

[0344] In a preferred embodiment, the LC medium comprises one or more compounds selected from Formula II of the following formulas:

[0345]

[0346] Where R 0 and X 0 It has the meaning given in Equation II.

[0347] Preferred compounds are those of formulas II-1, II-2 and II-3, with compounds of formulas II-1 and II-2 being particularly preferred.

[0348] In compounds of formulas II-1 to II-7, R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl, and X 0It can be expressed as F, CF3, CHF2, OCHF2 or OCF3, or OCF=CF2, OCHFCF3 or Cl, with F being the most preferred.

[0349] In one embodiment, the LC medium contains one or more compounds of formula II or its derivatives as described in the context, wherein Y 0 It is CH3. Most preferably, the LC medium according to this preferred embodiment comprises one or more compounds selected from Formula II of the following formulas:

[0350]

[0351] Where R 0 and X 0 It has the meaning given in Equation II.

[0352] Preferred compounds are those of formulas IIA-1, IIA-2 and IIA-3, with compounds of formulas IIA-1 and IIA-2 being particularly preferred.

[0353] In compounds of formulas IIA-1 to IIA-7, R 0 Preferably, it represents an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, very preferably ethyl, propyl, butyl, or pentyl, and X 0 It can be expressed as F, CF3, CHF2, OCHF2 or OCF3, or OCF=CF2, OCHFCF3 or Cl, with F being the most preferred.

[0354] The particularly preferred compound of formula II is selected from one or more of the following:

[0355]

[0356]

[0357]

[0358]

[0359]

[0360]

[0361]

[0362]

[0363]

[0364] The proportion of the compound of formula II in the LC medium is usually 0-20% by weight, very preferably 1-15% by weight, and most preferably 2-10% by weight.

[0365] In a further preferred embodiment, the LC medium comprises one or more compounds selected from Formula III of the following formulas:

[0366]

[0367]

[0368]

[0369]

[0370]

[0371]

[0372]

[0373] Where R 0 and X 0 It has the meaning given in Equation II.

[0374] Preferred compounds are those of formulas III-1, III-4, III-6, III-16, III-19 and III-22.

[0375] In compounds of formulas III-1 to III-22, R 0 The term indicates an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred, and X 0 This indicates F, CF3, CHF2, OCHF2, or OCF3, and also OCF=CF2, OCHFCF3, or Cl, with F being the most preferred, and Y... 0 H is the preferred option.

[0376] LC media may contain one or more compounds of formula III or its derivatives as described in the context, wherein Y 0 The form is CH3. Most preferably, the medium according to this preferred embodiment comprises one or more compounds selected from Formula III of the following formulas:

[0377]

[0378]

[0379]

[0380]

[0381]

[0382]

[0383]

[0384] Where R 0 and X 0 It has the meaning given in Equation III.

[0385] Preferred compounds are those of formulas IIIA-1, IIIA-4, IIIA-6, IIIA-16, IIIA-19 and IIIA-20.

[0386] In compounds of formulas IIIA-1 to IIIA-21, R 0 The term indicates an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred, and X 0 It can be expressed as F, CF3, CHF2, OCHF2 or OCF3, or OCF=CF2, OCHFCF3 or Cl, with F being the most preferred.

[0387] The particularly preferred compound of formula III is selected from one or more of the following:

[0388]

[0389]

[0390]

[0391]

[0392]

[0393]

[0394]

[0395]

[0396]

[0397]

[0398]

[0399]

[0400]

[0401]

[0402]

[0403]

[0404]

[0405] The proportion of the compound of formula III in the LC medium is preferably 1-50% by weight, very preferably 3-40% by weight, and most preferably 5-30% by weight.

[0406] In a further preferred embodiment, the LC medium according to the invention comprises one or more compounds of formula XXa:

[0407]

[0408] Where R 0 The term indicates an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred, and X 0 This indicates F, CF3, CHF2, OCHF2, or OCF3, and also OCF=CF2, OCHFCF3, or Cl, with F being the most preferred. 0 Preferably, it represents a straight-chain alkyl group, especially ethyl, n-propyl, n-butyl or n-pentyl, with n-propyl being particularly preferred.

[0409] One or more compounds of formula XX, particularly compounds of formula XXa, are preferably used in the LC medium according to the invention in an amount of 0-15% by weight, particularly preferably 0-10% by weight.

[0410] Very preferably, the LC medium according to the invention comprises one or more compounds of the following formula:

[0411]

[0412] Where R 0 The symbol represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms, with ethyl, propyl, butyl, or pentyl being particularly preferred. 0 Preferably, it represents a straight-chain alkyl group, especially ethyl, n-propyl, n-butyl or n-pentyl, with n-propyl being particularly preferred.

[0413] One or more compounds of formula XXI, particularly compounds of formula XXIa, are preferably used in the LC medium according to the invention in an amount of 0-15% by weight, particularly preferably 0-10% by weight.

[0414] More preferably, the LC medium according to the present invention comprises one or more compounds of formula XXIIIa:

[0415]

[0416] Where R 0 This indicates an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms. R 0 Preferably, it represents a straight-chain alkyl group, particularly ethyl, n-propyl, n-butyl or n-pentyl, very particularly preferably n-propyl, or cycloalkyl, particularly cyclopentyl.

[0417] Preferred specific compounds of formula XXIIIa particularly include

[0418]

[0419] One or more compounds of formula XXIII, particularly formula XXIIIa, are preferably used in the LC medium according to the invention in an amount of 0-5% by weight, particularly preferably 0-2% by weight.

[0420] LC media may additionally contain one or more compounds of formula XXIV:

[0421]

[0422] Where R 0 X 0 and L 1-6 Having the meaning shown in Equation III, s represents 0 or 1, and

[0423] express or

[0424] In equation XXIV, X 0 It can also represent an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms. The alkyl or alkoxy group is preferably straight-chain.

[0425] R 0 Preferably, it refers to an alkyl group having 1 to 6 carbon atoms. 0 Preferred option is F;

[0426] Compounds of formula XXIV are preferably selected from the following sub-formulas:

[0427]

[0428]

[0429] Where R 0 X 0 and L 1 It has the meaning shown in Equation III. R 0 Preferably, it refers to an alkyl group having 1 to 6 carbon atoms. 0 The preferred representation is F, and L 1 F is preferred;

[0430]

[0431] R 0 It is a straight-chain alkyl or alkenyl group having 2 to 6 carbon atoms;

[0432] LC media may further comprise one or more compounds of the following formula:

[0433]

[0434] Where R 1 and X 0 Each has the following properties in Equation II for R 0 and X 0 The meaning shown is as follows. R 1 Preferably, it represents an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a cycloalkenyl group having 5 or 6 carbon atoms; very preferably, it is ethyl, propyl, butyl, or pentyl. X 0 Preferably, it represents F, CF3, CHF2, OCHF2, or OCF3, and also OCF=CF2, OCHFCF3, or Cl, with F being the most preferred. In formula XXIV, X 0 Very particularly preferred to represent Cl.

[0435] Preferably, the LC medium of the present invention further comprises one or more compounds selected from the following formulas: YA, YB, YC, YD, YE, YF, YG, and B′.

[0436]

[0437]

[0438]

[0439] Each substituent has the following meaning:

[0440] express

[0441] R 21This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced in such a way that the O atoms are not directly connected to each other, and one or more H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more H atoms may be replaced by halogen atoms;

[0442] R 22 This indicates an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced in such a way that the O atoms are not directly connected to each other, and one or more H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more H atoms may be replaced by halogen atoms;

[0443] L 1 and L 2 Each can be represented independently as F, Cl, CF3, or CHF2;

[0444] L 3 and L 4 Each can be represented independently of the other, either H or F;

[0445] R 23 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3;

[0446] Z 1 and Z 2 Each of these can be used independently to represent a single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -COO-, -OCO-, -C2F4-, -CF=CF-, -CH=CHCH2O;

[0447] Z represents -CH2O-, -O-, -C2H4-, -OCH2-, or a single bond;

[0448] Y represents S or O, CH2, CH2CH2, CH2O, OCH2, CH=CH;

[0449] p represents 0, 1, or 2;

[0450] q represents 0 or 1;

[0451] In some preferred embodiments, one or more compounds selected from formulas YA, YB, YC, YD, YE, YF, YG, and B are selected from the following compounds:

[0452]

[0453]

[0454]

[0455]

[0456] in

[0457] R 21 and R 22 Each of these groups independently represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl, or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0458] R 23 The symbol represents an H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, preferably H or CH3.

[0459] In a preferred embodiment, one or more YA compounds are selected from the following formula:

[0460]

[0461]

[0462]

[0463]

[0464]

[0465]

[0466]

[0467]

[0468]

[0469]

[0470]

[0471]

[0472]

[0473]

[0474]

[0475]

[0476]

[0477]

[0478]

[0479]

[0480]

[0481]

[0482]

[0483]

[0484] in

[0485] 'a' represents 1 or 2.

[0486] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0487] alkenyl represents a straight-chain alkenyl group having 2 to 6 carbon atoms, and

[0488] (O) represents an oxygen atom or a single bond, and

[0489] alkenyl is preferably represented as 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-.

[0490] Particularly preferred LC media according to the invention comprise one or more compounds selected from the group consisting of formulas YA-2, YA-8, YA-10, YA-16, YA-18, YA-36, YA-37, YA -38, YA-39, YA-40, YA-41, YA-42, YA-43, YA-77, YA-78, YA-88, YA-90 and YA-92 compounds.

[0491] Preferably, one or more compounds of formula YA-2 are selected from the following sub-formulas:

[0492]

[0493] Alternatively, preferably, in addition to the compounds of formulas YA-2-1 to YA-2-5, the LC medium also comprises one or more compounds of the following formulas:

[0494]

[0495] More preferably, the LC medium comprises one or more compounds selected from the following formula: YA-10

[0496]

[0497] Alternatively, preferably, in addition to compounds of formulas YA-10-1 to YA-10-5, the LC medium comprises one or more compounds of the following formulas:

[0498]

[0499] More preferably, the LC medium comprises one or more compounds selected from the formula YA-37:

[0500]

[0501] Alternatively, preferably, in addition to the compounds of formulas YA-37-1 to YA-37-5, the LC medium comprises one or more compounds of the following formulas:

[0502]

[0503] More preferably, the LC medium comprises one or more compounds selected from the following formula: YA-41

[0504]

[0505] More preferably, the LC medium comprises one or more compounds selected from the formula YA-66:

[0506]

[0507] More preferably, the LC medium comprises one or more compounds selected from the formula YA-67:

[0508]

[0509] More preferably, the LC medium comprises one or more compounds selected from the formula YA-77:

[0510]

[0511] More preferably, the LC medium comprises one or more compounds selected from the following formula: YA-90

[0512]

[0513] In another preferred embodiment, the LC medium comprises one or more compounds of formula YB selected from YB-1 to YB-43:

[0514]

[0515]

[0516]

[0517]

[0518]

[0519]

[0520]

[0521]

[0522]

[0523]

[0524] in

[0525] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0526] alkenyl represents a straight-chain alkenyl group having 2 to 6 carbon atoms, and

[0527] (O) represents an oxygen atom or a single bond, and

[0528] alkenyl is preferably represented as 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-.

[0529] Particularly preferred LC media according to the invention comprise one or more compounds selected from formulas YB-2, YB-11, YB-17 and YB-34.

[0530] Preferably, the LC medium comprises one or more compounds selected from the following formula: YB-11

[0531]

[0532] Alternatively, in addition to compounds of formulas YB-11-1 to YB-11-5, the LC medium preferably also contains one or more compounds of the following formulas:

[0533]

[0534] Preferably, the LC medium comprises one or more compounds selected from the following formula: YB-17

[0535]

[0536] LC media may contain one or more compounds selected from the following formulas: YB-34

[0537]

[0538] In another preferred embodiment, the LC medium comprises one or more YC compounds selected from the following formula:

[0539]

[0540] Among them alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0541] LC media may contain one or more compounds selected from the following formulas: YC-1 and YC-2

[0542]

[0543] In another preferred embodiment, the LC medium comprises one or more YD compounds selected from the following formula:

[0544]

[0545]

[0546]

[0547]

[0548]

[0549]

[0550]

[0551]

[0552] in

[0553] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0554] alkenyl represents a straight-chain alkenyl group with 2 to 6 carbon atoms.

[0555] (O) represents an oxygen atom or a single bond.

[0556] Y represents H or CH3, and

[0557] alkenyl is preferably represented as 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-.

[0558] A further preferred embodiment of the LC medium according to the invention comprises one or more compounds of the formula YD-1.

[0559] A further preferred LC medium according to the invention comprises one or more compounds of formula YD, wherein q is 0, R 23 It is H and R 22It represents an alkyl or alkoxy group having 1 to 6 carbon atoms, wherein one of the CH2 groups is optionally replaced by cyclopropyl, cyclobutyl, cyclopentyl or cyclopentenyl, preferably selected from the formulas YD-1, YD-12, YD-13, YD-14, YD-15, YD-16, YD-17, YD-18, YD-19 and YD-20, and very preferably selected from the formulas YD-13, YD-18, YD-19 and YD-20.

[0560] The most preferred YD compound is a compound selected from the following formulas:

[0561]

[0562]

[0563]

[0564]

[0565]

[0566]

[0567]

[0568]

[0569]

[0570]

[0571]

[0572] Where v is 1, 2, 3, 4, 5 or 6.

[0573] In a preferred embodiment, the LC medium comprises one or more compounds of formula YD-7a:

[0574]

[0575] Where R 21 Y and q have the meanings given in equation YD, and R 23 yes

[0576] , where r is 0, 1, 2, 3, 4, 5 or 6 and s is 1, 2 or 3.

[0577] Preferred compounds of formula YD-7a are selected from the following sub-formulas:

[0578]

[0579]

[0580]

[0581]

[0582]

[0583]

[0584]

[0585]

[0586]

[0587] In a preferred embodiment, the LC medium comprises one or more YE compounds selected from the following formula:

[0588]

[0589]

[0590]

[0591]

[0592]

[0593]

[0594]

[0595]

[0596]

[0597]

[0598]

[0599]

[0600]

[0601]

[0602]

[0603]

[0604]

[0605]

[0606]

[0607]

[0608] in

[0609] 'a' represents 1 or 2.

[0610] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0611] alkenyl represents a straight-chain alkenyl group having 2 to 6 carbon atoms, and

[0612] (O) represents an oxygen atom or a single bond, and

[0613] alkenyl is preferably represented as 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-.

[0614] Particularly preferred LC media according to the invention comprise one or more compounds selected from the formulas YE-2, YE-8, YE-10, YE-16, YE-18, YE-37, YE-38, YE-39 and YE-40.

[0615] Preferably, the LC medium comprises one or more compounds selected from the following formula: YE-2

[0616]

[0617] Preferably, the LC medium comprises one or more compounds selected from the following formula: YE-10

[0618]

[0619] In another preferred embodiment, the LC medium comprises one or more YF compounds selected from the following formula:

[0620]

[0621] in

[0622] alkyl and alky Each of these terms independently represents a straight-chain or branched alkyl group having 1 to 6 carbon atoms.

[0623] Preferably, the LC medium comprises one or more compounds of formula YF-2 selected from the following formulas:

[0624]

[0625] Preferably, one or more YF-4 compounds are selected from the following sub-formulas:

[0626]

[0627] In a preferred embodiment, the LC medium comprises one or more YG compounds selected from the following formula:

[0628]

[0629] in

[0630] alkyl and alky Each of these terms independently represents a straight-chain alkyl group having 1 to 6 carbon atoms.

[0631] alkenyl represents a straight-chain alkenyl group having 2 to 6 carbon atoms, and

[0632] (O) represents an oxygen atom or a single bond, and

[0633] alkenyl is preferably represented as 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-.

[0634] Particularly preferred LC media according to the invention comprise one or more compounds selected from formulas YG-1, YG-2 and YG-6.

[0635] Preferably, the compounds of formulas YG-1, YG-2 and YG-6 are selected from the following sub-formulas:

[0636]

[0637] In a preferred embodiment of the invention, the medium contains one or more compounds selected from the following formula B′:

[0638]

[0639] Among them, Y and L 1 L 2 R 21 and R 22It has the meaning given in equation B′.

[0640] Preferred compounds of formula B′1 are selected from the following sub-formulas:

[0641]

[0642] Where R 21 and R 22 Independently represents a straight-chain alkyl group having 1 to 6 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms can be replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms can be replaced by halogen atoms.

[0643] Highly preferred are compounds of formulas B′1-1 and B′1-2, wherein the two groups (O) represent oxygen atoms, and R 1 and R 3 Alkyl groups are independently designated, and the alkyl group is methyl, ethyl, propyl, butyl, pentyl, or hexyl, preferably straight-chain. Very preferably, one "alkyl" is ethyl, and the other "alky" is ethyl. ” is n-pentyl.

[0644] Compounds of formula B′1-2 are particularly preferred.

[0645] Preferably, the compound of formula B′1-1 is selected from compounds of formulas B′1-1-1 to B′1-1-10, and more preferably, a compound of formula B′1-1-6:

[0646]

[0647]

[0648]

[0649] in

[0650] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms."

[0651] “alkenyl” and “alkeny” "Each independently represents a straight-chain alkenyl group having 2 to 6 carbon atoms,"

[0652] “alkoxy” and “alkox” Each of these terms independently represents a straight-chain alkoxy group having 1 to 6 carbon atoms.

[0653] Preferably, the compounds of formula B′1-2 are selected from compounds of formulas B′1-2-1 to B′1-2-10, and more preferably compounds of formula B′1-2-6:

[0654]

[0655]

[0656]

[0657] in

[0658] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms."

[0659] “alkenyl” and “alkeny” "Each independently represents a straight-chain alkenyl group having 2 to 6 carbon atoms,"

[0660] “alkoxy” and “alkox” Each of these terms independently represents a straight-chain alkoxy group having 1 to 6 carbon atoms.

[0661] Optionally, the LC medium comprises one or more compounds of formula B′1-1A and / or B′1-2A:

[0662]

[0663] in

[0664] (O) represents O or a single bond.

[0665] R IIIA C indicates an alkyl or alkenyl group or group having up to 7 carbon atoms. y -C m H 2m+1 -,

[0666] m and n are the same or different, being 0, 1, 2, 3, 4, 5, or 6, preferably 1, 2, or 3, and very preferably 1.

[0667] C y It represents an alicyclic group having 3, 4 or 5 ring atoms, which is optionally substituted with an alkyl or alkenyl group having up to 3 carbon atoms, or substituted with a halogen, and preferably represents cyclopropyl, cyclobutyl, cyclopentyl or cyclopentenyl.

[0668] Compounds of formula B′1-1A and / or B′1-2A are included in the medium in place of compounds of formula B′1-1 and B′1-2, or in addition to compounds of formula B′1-1 and B′1-2.

[0669] Preferred compounds of formula B′1-1A and / or B′1-2A also include the following:

[0670]

[0671]

[0672] Where alkoxy represents a straight-chain alkoxy group having 1 to 6 carbon atoms, or alternatively -(CH2). n F, where n is 2, 3, 4 or 5, preferably C2H4F.

[0673] The proportion of the compound of formula B′1 or its sub-formula in the LC medium is preferably 0-20% by weight, and very preferably 0-15% by weight.

[0674] Preferably, the LC medium contains one, two, or three compounds of formula B′1 or its derivatives.

[0675] In a preferred embodiment of the present invention, the LC medium may comprise one or more compounds of formula B′2-2.

[0676]

[0677] in

[0678] R 21 R 22 The same or different denotes alkyl or alkoxy groups having 1 to 6 carbon atoms, wherein one or more CH2 groups among these groups are independently and optionally marked with -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The O atoms can be replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and in addition, one or more H atoms can be replaced by halogens.

[0679] The compounds of formula B′2-2 are preferably selected from compounds of formulas B′2-2-1 to B′2-2-10:

[0680]

[0681]

[0682] Where R22 The symbol represents an alkyl group having 1 to 6 carbon atoms, preferably ethyl, n-propyl, or n-butyl, or alternatively cyclopropylmethyl, cyclobutylmethyl, or cyclopentylmethyl, or alternatively -(CH2). n F, where n is 2, 3, 4 or 5, preferably C2H4F.

[0683] The particularly preferred compounds of formula B′2 are selected from the following sub-formulas:

[0684]

[0685] The proportion of the compound of formula B′2 or its sub-formula in the LC medium is preferably 1-20 wt%, and very preferably 1-15 wt%.

[0686] Preferably, the LC medium contains compounds of formula B2 or its sub-formulas 1, 2 or 3.

[0687] In a preferred embodiment, the LC medium contains one or more compounds of formula B′ or its subformulas B′1, B′2, B′3, B′1-1, B′1-2, B′2-1, B′2-2, B′2-3, B′3-1, B′3-2, B′3-1-1, B′3-1-2, B′3-2-1, and B′3-2-2, wherein the dibenzofuran or dibenzothiophene group is substituted with a methyl or methoxy group, preferably with a methyl group, preferably at the p-position of the substituent F, and very preferably at the p-position of the substituent F (i.e., at the terminal group R). 2 or X 1 (m-bit).

[0688] Preferably, the total proportion of compounds of formula B′ or its sub-formulas in the LC medium is 2-25% by weight, and very preferably 3-20% by weight.

[0689] The total content of compounds of formulas YA to YG and B′ in the LC medium is preferably 0-15% by weight, more preferably 0.5-10% by weight.

[0690] In addition to compounds of formula I, P, S and / or B, the LC medium preferably contains one or more compounds of formula N1 and N2:

[0691]

[0692] in

[0693] and Independently, if If they appear twice, they represent each other independently.

[0694]

[0695] Z 41 and Z 42 Independent of each other and if Z 41 If they appear twice, they also independently represent -CH2CH2-, -COO-, trans- CH=CH-、 trans- CF = CF-, -CH2O-, -CF2O-, -C≡C- or a single bond.

[0696] p represents 0, 1, or 2.

[0697] R 41 and R 42 Each of the above independently represents an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0698] to If they exist, they are represented independently of each other.

[0699]

[0700] R 51 and R 52 Each has its own R independently 41 and R 42 The meaning;

[0701] Z 51 To Z 53 Each possesses Z independently of the others. 41 and Z 42 The meaning of, and

[0702] i and j each represent 0 or 1 independently.

[0703] One or more of these, preferably one aromatic ring, may optionally be substituted with an alkyl group, preferably with a methyl group.

[0704] In some embodiments, the compound of formula N1 is represented by one of the following formulas:

[0705]

[0706]

[0707] in

[0708] “alkyl” and “alky” Each of these terms independently represents an alkyl group having 1 to 6 carbon atoms;

[0709] “alkenyl” and “alkeny” Each of them independently represents an alkenyl group having 2 to 6 carbon atoms.

[0710] Compounds of formulas Z1 and Z2 are highly preferred.

[0711] Preferred compounds of formulas Z1 to Z10 are selected from the following sub-formulas:

[0712]

[0713]

[0714]

[0715]

[0716]

[0717]

[0718] In another preferred embodiment, the LC medium contains one or more compounds of formula Z1 or preferred sub-formulas thereof and / or one or more compounds selected from formulas Z2, Z3, Z4 and Z5 or preferred sub-formulas thereof.

[0719] Preferably, the total proportion of compounds of formulas Z1, Z2, Z3, Z4, Z5, and Z6 or their sub-formulas, such as CC-3-V, in the medium is 10-65% by weight, very preferably 20-60% by weight, and most preferably 25-55% by weight. In yet another more preferred embodiment, the compound of formula Z1-1 is used at a concentration of 10% to 60% by weight, more preferably 25% to 50% by weight, based on the total weight of the LC medium. In a further preferred embodiment, the LC medium comprises a total of 50% to 70% by weight of compounds represented by formulas Z1-1 and Z4-2.

[0720] Preferably, the medium comprises one, two, or three compounds selected from formulas Z1, Z2, Z3, and Z4 or their subforms.

[0721] LC media may additionally contain one or more compounds of the following general formulas.

[0722]

[0723] in

[0724] R 1 and R 2 Each of these terms independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms.

[0725] Compounds of formula XII are preferably selected from the following sub-formulas:

[0726]

[0727] Among them, "alkyl" and "alky" Each of them independently represents methyl, ethyl, propyl, butyl, pentyl or hexyl.

[0728] Compounds of formulas XIIa and XIIc are particularly preferred. In formula XIIb, "alkyl" is preferably represented independently of each other. n -C3H7、 n -C4H9 or n -C5H 11 ,in particular n -C3H7. In formula XIIc, "alkyl" preferably represents... n -C3H7, and "alky "Preferred to be CH3 or" n -C3H7.

[0729] The particularly preferred compound of formula XII is described by the following structure:

[0730]

[0731] The total content of the compound of formula XII in the LC medium is preferably 0-20% by weight, more preferably 2-10% by weight.

[0732] LC media may additionally contain one or more compounds selected from the following formulas:

[0733]

[0734] in

[0735] R 1 and R 2 Each of these terms independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms; and

[0736] L 1 and L 2 Each can be represented independently of the other, such as H, F, or Cl.

[0737] And R 1 and R 2 Each of the substituents preferably independently represents a n-alkyl, cycloalkyl, alkoxy, oxaalkyl, fluoroalkyl, or alkenyl group having at most 6 carbon atoms, and more preferably each of the substituents independently represents an alkyl group having 1 to 6 carbon atoms; in compounds of formula XIV. In some embodiments, the substituent R 1 and R 2 At least one or two of them may preferably represent an alkenyl group having 2 to 6 C atoms.

[0738] The LC medium may further optionally comprise one or more compounds of formula XIV, wherein the substituent R 1 and R 2 At least one of them represents an alkenyl group having 2 to 6 C atoms, preferably selected from those of the following formulas:

[0739]

[0740]

[0741] Among them, "alkyl" and "alky" “alkenyl” and “alkeny” "Having the above meanings, and each of them independently preferably represents methyl, ethyl or propyl."

[0742] Compounds of formula XIV are preferably selected from the following sub-formulas:

[0743]

[0744] Compounds of formulas XIVd-1, XIVd-2, XIVe-1, XIVe-2 and XIVe-3 are highly preferred.

[0745] The LC medium may further optionally comprise one or more compounds of formula XV, wherein the substituent R 1 and R 2 At least one of them represents an alkyl or alkoxy group having 2 to 6 carbon atoms, preferably selected from those of the following formulas:

[0746]

[0747] Among them, "alkyl" and "alky" "Having the above meanings, and each of them independently preferably represents methyl, ethyl or propyl."

[0748] In yet another embodiment, the LC medium comprises one or more compounds of formula XVI:

[0749]

[0750] in

[0751] R 1 and R 2 Each of these terms independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms; and

[0752] L represents H, F, or Cl.

[0753] The particularly preferred XVI compounds are those with the following formulas:

[0754]

[0755] in

[0756] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms, particularly ethyl, propyl, or pentyl, and..."

[0757] “alkenyl” and “alkeny” "Each of them independently represents a straight-chain alkenyl group having 2 to 6 C atoms, especially CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH and CH3CH=CH."

[0758] Compounds of formulas XVIb and XVIc are particularly preferred. Compounds of the following formulas are very particularly preferred:

[0759]

[0760]

[0761] In addition to or as a substitute for compounds of formula XVI, the following compounds may be used:

[0762]

[0763] In yet another embodiment, the LC medium comprises one or more compounds of formula XIII:

[0764]

[0765] in

[0766] R 1 and R 2 Each of these terms independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms; and

[0767] L represents H, F, or Cl.

[0768] The particularly preferred compounds of formula XIII are those with the following formulas:

[0769]

[0770] in

[0771] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms, particularly ethyl, propyl, or pentyl, and..."

[0772] “alkenyl” and “alkeny” "Each of them independently represents a straight-chain alkenyl group having 2 to 6 C atoms, especially CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH and CH3CH=CH."

[0773] Compounds of formulas XIIIa and XIIIb are particularly preferred. Compounds of the following formulas are very particularly preferred:

[0774]

[0775] In yet another embodiment, the LC medium comprises one or more compounds of formula XIII′:

[0776]

[0777] Where R 1 and R 2 Having Equation II for R 0 The meanings indicated are, and preferably, each independently represents an alkyl group having 1 to 6 carbon atoms. L represents H, F, or Cl.

[0778] The particularly preferred compounds of formula XIII′ are those with the following formulas:

[0779]

[0780] in

[0781] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms, particularly ethyl, propyl, or pentyl, and..."

[0782] “alkenyl” and “alkeny” "Each of them independently represents a straight-chain alkenyl group having 2 to 6 C atoms, especially CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH and CH3CH=CH."

[0783] Compounds of formulas XIII′a and XIII′b are particularly preferred. Compounds of the following formulas are very particularly preferred:

[0784]

[0785] LC media may optionally contain one or more compounds of the following formula:

[0786]

[0787] in

[0788] R 1 and R 2 Each of these terms independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms; and

[0789] L represents H, F, or Cl.

[0790] Compounds of formula XVIIa are highly preferred, wherein L is H or F. Compounds of formula XVIIb are highly preferred, wherein L is F.

[0791] LC media may additionally contain one or more compounds of the following formula:

[0792]

[0793] Where R 1 and R 2 They respectively have the meaning shown in Equation I and L has the L in Equation YA 1 The meaning of R. 1 and R 2 Preferably, it refers to an alkyl, alkoxy, oxalyl, fluoroalkyl, or alkenyl group having up to 6 carbon atoms.

[0794] The particularly preferred compounds of formula XXXII are those with the following formulas:

[0795]

[0796] in

[0797] “alkyl” and “alky” "Each independently represents a straight-chain alkyl group having 1 to 6 carbon atoms, particularly ethyl, propyl, or pentyl, and..."

[0798] “alkenyl” refers to a straight-chain alkenyl group with 2 to 6 carbon atoms, especially CH2=CHC2H4, CH3CH=CHC2H4, CH2=CH and CH3CH=CH.

[0799] Compounds with the following formulas are highly preferred:

[0800]

[0801] In some other embodiments, the LC medium comprises one or more compounds of the following formula:

[0802]

[0803] Where R 1 and R 2 Each has the meaning shown in Formula I, and preferably each represents an alkyl group having 1 to 6 C atoms independently of the other.

[0804] Advantageously, the LC medium of the present invention also comprises one or more compounds of formulas LP1 and LP2.

[0805]

[0806]

[0807] Each substituent has the following meaning:

[0808] R 0 and R 2 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, , , , , -O-, -CO-O-, or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be substituted by cycloalkyl or cycloalkoxy groups having 3 to 12 C atoms;

[0809] L 1 and L 2 Each can be represented independently of the other, such as H, F, or Cl.

[0810] Y 0 The H atom, an alkyl group having 1 to 3 carbon atoms, or an alkenyl group having 2 to 3 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally substituted with -C≡C-, -CF2O-, -OCF2-, -O-, -CO-O-, or -O-CO- such that the O atoms are not directly connected to each other, preferably H or CH3; and

[0811] X 0It represents a halogen atom, -CN, -SCN, -NCS, or an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenoxy group having 2 to 6 carbon atoms, wherein one or more H atoms are substituted by a halogen atom.

[0812] One or more compounds of formulas LP1 and LP2 are preferably described by formulas LP1-1 and LP2-1:

[0813]

[0814] in

[0815] R 0 It is an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms can be replaced by halogen atoms;

[0816] R 2 It is an alkyl group having 1 to 6 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms can be replaced by halogen atoms;

[0817] X 0 It is an F atom or an alkyl or alkoxy group having 1 to 3 C atoms or an alkenyl or alkenoxy group having 2 or 3 C atoms, wherein one or more H atoms are replaced by F atoms; and

[0818] Y 0 It can be H or CH3.

[0819] Compounds of general formulas LP1 and LP2 can also be represented by one of the following:

[0820]

[0821]

[0822] in

[0823] R0 It is an alkyl or alkoxy group having 1 to 12 carbon atoms, wherein one or more CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, , , , , The H atoms are replaced by -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, preferably alkyl having 1 to 4 C atoms, alkenyl or alkenoxy having 2 to 6 C atoms, or cycloalkyl or cycloalkoxy having 3 to 6 C atoms, wherein vinyl, allyl, or cyclopentyl are particularly preferred;

[0824] n represents 1, 2, 3, 4, or 5; and

[0825] m represents 1, 2, 3, or 4.

[0826] The particularly preferred LP1 compounds are those selected from the following formulas:

[0827]

[0828]

[0829]

[0830]

[0831] Where Y 0 It is H or CH3, with H being preferred.

[0832] The most preferred compounds are those with the formulas LP1-1a, LP1-1b and LP1-1c, and the most preferred compound is LP1-1a.

[0833] The particularly preferred LP2 compounds are those selected from the following formulas:

[0834]

[0835]

[0836]

[0837]

[0838] Where Y 0 It is H or CH3, with H being preferred.

[0839] The compounds of formulas LP2-1a, LP2-1b, LP2-1c, LP2-1d and LP2-1i, LP2-2b, LP2-2c, LP2-3a, LP2-3c are highly preferred, and the compound of formula LP2-1b is most preferred.

[0840] The total proportion of compounds of formula LP1 or LP2 or their derivatives in the LC medium is preferably 2-35% by weight, very preferably 3-30% by weight, and most preferably 4-20% by weight.

[0841] Preferably, the LC medium contains one, two, or three compounds of formula LP1 or LP2 or their derivatives. In a particularly preferred embodiment, the LC medium comprises at least one compound of formula LP1 and at least one compound of formula LP2.

[0842] Compounds of formula ST

[0843] In some preferred embodiments of the present invention, the LC medium may further comprise one or more compounds of the general formula ST:

[0844]

[0845] Each substituent has the following meaning:

[0846] express , or ;

[0847] X 21 X 22 Each can be represented independently as -O-, -CH2-, or -CHR. 23 -or-NR 23 -,

[0848] R 21 and R 22 Each of the following groups independently represents an H atom or an alkyl or alkoxy group having 1 to 12 carbon atoms, an alkenyl, ynyl, alkenoxy, or alkoxyalkyl group having 2 to 12 carbon atoms, or a cycloalkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms;

[0849] R 23 Represents an H atom, an alkyl or alkoxy group having 1 to 10 C atoms,

[0850] r represents 0 or 1.

[0851] LC media containing compounds with the following subformulas ST-1, ST-2, and ST-3 exhibit exceptionally high long-term thermal and UV stability:

[0852]

[0853] Each substituent has the following meaning:

[0854] express , or ;

[0855] R 21 and R 22 Each independently represents a H atom or an alkyl or alkoxy group having 1 to 7 C atoms, and

[0856] r represents 0 or 1.

[0857] In a particularly preferred embodiment, the compound of general formula ST may be selected from the following specific structures:

[0858]

[0859]

[0860]

[0861]

[0862]

[0863]

[0864]

[0865] In a further preferred embodiment, the LC medium according to the invention may contain at least one other sterically hindered phenol, which is mentioned in Table B below.

[0866] Compound H

[0867] LC media may optionally contain one or more compounds of the formula H.

[0868]

[0869] in

[0870] R 11 Each of these groups independently represents an H atom, F, or an alkyl group having 1 to 20 C atoms, wherein one or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or more -CH2- groups, if present, can be replaced by -CH=CH- or -C≡C-, and one or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Replacement

[0871] R 12 Each of the above is an alkyl group, each independently representing an H atom, having 1 to 20 C atoms, wherein one or more -CH2- groups can be substituted with -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted with -O-; a hydrocarbon group containing a cycloalkyl or alkylcycloalkyl unit, wherein one or more -CH2- groups can be substituted with -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted with -O-; and one or more H atoms can be substituted with F, OR 13 、N(R 13 (R) 14 ) or R 15 Substitution, or aromatic or heteroaromatic hydrocarbon group, in which one or more H atoms can be ORed 13 、N(R 13 (R) 14 ) or R 15 Replacement

[0872] R 13 and R 14 Each of these groups independently represents an alkyl or acyl group having 1 to 10 carbon atoms, or an aromatic hydrocarbon or carboxylic acid group having 6 to 12 carbon atoms.

[0873] R 15 Each of these groups independently represents an alkyl group having 1 to 10 carbon atoms. One or more -CH2- groups may be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-.

[0874] R 16 Each of these can be independently represented by a H atom, an alkyl or alkoxy group having 1 to 10 carbon atoms, an O-cycloalkyl group having 3 to 12 carbon atoms, or an O· or OH group.

[0875] S11 and S 12 Each of these terms independently represents an alkylene group having 1 to 20 carbon atoms, wherein one or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Substitution, or indicating a single bond,

[0876] Y 11 To Y 14 Each can independently represent either methyl or ethyl.

[0877] X 11 C represents...

[0878] Z 11 To Z 14 Each of these can be represented independently as -O-, -(C=O)-, -O-(C=O)-, -(C=O)-O-, -O-(C=O)-O-, -(NR-). 13 )-、-NR 13 -(C=O)- or a single bond, if S 11 It is a single key; Z 11 and Z 12 The two cannot both represent -O-; if S 12 If it is a single bond, then Z 13 and Z 14 Both cannot simultaneously represent -O-; and if q represents 0, then Z 12 and Z 13 The two cannot both represent -O-.

[0879] p represents 1 or 2,

[0880] q represents 0 or 1.

[0881] o represents (3-p),

[0882] n represents an integer from 1 to 10.

[0883] m represents an integer from 0 to 8, where

[0884] n p represents an integer from 1 to 10, preferably from 3 to 8, and

[0885] This represents an organic moiety with (m+n) bonding sites.

[0886] In some preferred embodiments of the invention, in compounds of formula H,

[0887] express , (biphenyl-1,1′,3,3′-tetramethyl) or (Benzene-1,2,4,5-tetramethyl)

[0888] express (Benzene-1,3,5-trimethyl) or (Benzene-1,2,4-trimethyl)

[0889] The following are represented as -(CH2-)2, -(CH2-)3, -(CH2-)4, -(CH2-)5, -(CH2-)6, -(CH2-)7, and -(CH2-)8 (i.e., ethane-1,2-diyl, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, and octane-1,8-diyl). (1,4-phenylene) (1,3-phenylene) (1,2-phenylene) or (trans-1,4-cyclohexylene) and / or

[0890] in

[0891] -Z 12 -S 11 -Z 11 - Each occurrence represents -O-, S independently of each other. 11 -O-、-OS 11 -O-、-(C=O)-OS 11 -O-、-O-(C=O)-S 11 -O-、-O-(C=O)-S 11 -(C=O)-O-、-OS 11 -(C=O)-O-、-(C=O)-OS 11 -C-、-(C=O)-OS 11 -O-(C=O)- or -(NR) 13 )-S 11 -O-、-(NR 13 -C(=O)-S 11 -(C=O)-O or a single bond, preferably -O- or -S. 11 -O-、-OS 11 -O-、-(C=O)-OS 11 -O-、-O-(C=O)-S 11-0 or -OS 11 -(C=O)-O-, and / or

[0892] S 11 Preferably, it represents an alkylene group having 1 to 20 carbon atoms, and / or

[0893] R 11 If present, it indicates alkyl, alkoxy, or H, preferably H or alkyl, and / or

[0894] R 12 It represents H, methyl, ethyl, propyl, isopropyl, or 3-heptyl or cyclohexyl.

[0895] In a preferred embodiment of this application, in the compound of formula H,

[0896] Groups selected from the following formulas:

[0897]

[0898] In other preferred embodiments of this application, in compounds of formula H,

[0899] Groups selected from the following formulas

[0900]

[0901] In yet another preferred embodiment of the invention, wherein p preferably represents a compound of formula H,

[0902] express Preferred OS 11 -O-、-S 11 -O- or -OS 11 -,Special Selection-OS 11 -O- or -S 11 -O-.

[0903] In other preferred embodiments of the invention, in compounds of formula H, the group Groups selected from the following formulas

[0904]

[0905] or

[0906] In other preferred embodiments of the invention, p is 2, which may be the same as or different from the above, in compounds of formula H,

[0907] Groups selected from the following formulas

[0908]

[0909] and

[0910] .

[0911] In yet another preferred embodiment of the invention, it may be the same as or different from those described above, in which the group in formula H compound... Each occurrence is represented independently.

[0912]

[0913] Compounds of the following general formulas H-1-1, H-1-2, and H-1-3 are shown to be particularly effective UV stabilizers in LC mixtures, especially in terms of VHR stability:

[0914]

[0915] Among them, ZG and R 16 As defined above, n represents an integer from 1 to 8. These compounds are well-suited as stabilizers in LC mixtures and stabilize the VHR of the mixture upon UV exposure.

[0916] In a particularly preferred embodiment, one or more compounds of formula H may be selected from compounds of formulas H-2-1 to H-2-6:

[0917]

[0918]

[0919] in

[0920] R 11 Each of the following groups independently represents an H atom and has 1 to 20 C atoms. One or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-. One or more -CH2- groups, if present, can be replaced by -CH=CH- or -C≡C-. One or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Replacement

[0921] R 16 Represents H atom or O·,

[0922] n represents an integer from 0 to 12, and

[0923] S 11 and S 12 Each of these terms independently represents an alkylene group having 1 to 20 carbon atoms, wherein one or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Substitution, or indicates a single bond.

[0924] In a preferred embodiment of the invention, the LC medium according to the invention comprises, in each case, one or more compounds of formula H selected from compounds of the following formula:

[0925]

[0926]

[0927]

[0928]

[0929]

[0930]

[0931]

[0932]

[0933]

[0934]

[0935]

[0936]

[0937]

[0938]

[0939]

[0940]

[0941] and

[0942]

[0943] The preferred content of one or more compounds of formula H in the LC medium depends particularly on the inherent chemical stability of the LC medium and the properties of the compounds of formula H. Based on the weight of the LC medium, where R 16 Compounds of formula H representing O· (which are called NO radical-type HALS) are preferably used at a concentration of 50 ppm to 1000 ppm. Based on the weight of the LC medium, where R... 16 Compounds with the formula H representing the H atom (which are called NH group type HALS) are advantageously used in proportions of 50 ppm to 2000 ppm.

[0944] Further preferred LC media are selected from the following preferred embodiments, including any combination thereof:

[0945] • Combinations of Formula I compounds and one or more Formula P, S and / or B compounds with Formula LP1, Z1 to Z7 and Formula II and / or III compounds

[0946] • Combinations of Formula I compounds and one or more Formula P, S and / or B compounds with Formula LP2, Z1 to Z7 and Formula II and / or III compounds

[0947] • Combinations of Formula I compounds and one or more Formula P, S and / or B compounds with Formula LP1, LP2, II and / or III compounds and Formula Z1 and Z4 compounds

[0948] - The LC medium contains one or more compounds of formula I and one or more compounds of formula P, S and / or B or their sub-formulas and LP1 and / or LP2, II and / or III, as well as one or more compounds selected from formulas 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, XXXa-1, XXXa-2, XXXa-3, XXXII, XXXIII and S and their sub-formulas.

[0949] - The LC medium contains one or more compounds of formula I or its sub-formulas, one or more compounds of formulas P, S and / or B and LP1 and / or LP2, II and / or III, and one or more compounds selected from formulas Z1, Z2, Z3, Z4, Z5, IV, VI, XII, XIV, XVI, XVIIa, XVIIb, XVIIc, XX, LP1-1, XXIII, XXIX and S and their sub-formulas.

[0950] - The LC medium contains one or more compounds selected from formulas II-1, II-2, and II-3, with a high preference for compounds selected from formulas II-1 and II-2. The individual concentration of each of these compounds is preferably 2-15% by weight. The total concentration of these compounds is preferably 5-25% by weight.

[0951] - The LC medium comprises one or more compounds selected from formulas III-1, III-4, III-6, III-16, III-19, and III-20, with compounds selected from formulas III-1, III-6, III-16, and III-20 being particularly preferred. The individual concentration of each of these compounds is preferably 2-15% by weight. The total concentration of these compounds is preferably 5-30% by weight.

[0952] - The LC medium contains one or more compounds of formula IV, preferably selected from formula IVa or IVc, very preferably selected from formula IVa-1 or IVc-1, and most preferably selected from formula IVc-1. The individual concentration of each of these compounds is preferably 2-15% by weight. The total concentration of these compounds is preferably 5-20% by weight.

[0953] - The LC medium contains one or more compounds of formula VI, preferably selected from formula VIb. The individual concentration of each of these compounds is preferably 1-20% by weight. The total concentration of these compounds is preferably 5-20% by weight.

[0954] - The LC medium contains one or more compounds of formula Z1, preferably selected from formula Z1-1. The total concentration of these compounds is preferably 1-70% by weight, more preferably 5-60% by weight, even more preferably 10-50% by weight, and particularly preferably 20-50% by weight.

[0955] - The LC medium contains one or more compounds of formula Z2, preferably selected from formulas Z2-1 and Z2-2. The total concentration of these compounds is preferably 2-35% by weight, very preferably 3-25% by weight.

[0956] - The LC medium contains 5-20% by weight of compound of formula Z3, preferably compound of formula Z3-1.

[0957] - The LC medium contains 5-20% by weight of compound of formula Z4, preferably compound of formula Z4-1.

[0958] - The LC medium contains 1-20% by weight, very preferably 2-15% by weight of the Z5 compound.

[0959] - The LC medium contains one or more compounds of the formula LP1-1, preferably LP1-1a or LP2-1b, or very preferably LP1-1a. The concentration of these compounds is preferably 2-15% by weight.

[0960] - The LC medium contains 1-15% by weight of a compound of formula LP2-1b.

[0961] - The LC medium contains one or more compounds of formula XII, preferred formula XIIa or XIIb, very preferred formula XIIa, and most preferred formula XIIa-1. The concentration of these compounds is preferably 2-15% by weight.

[0962] - The LC medium contains 1-15% by weight of compound of formula XIIb.

[0963] - The LC medium contains one or more compounds of formula XIV, preferably of formula XIVd, and most preferably of formula XIVd-1. The concentration of these compounds is preferably 2-10% by weight.

[0964] - The LC medium contains one or more compounds of the formula XVIb, preferably compounds of the formula XVIb-1, XVIb-2 and / or XVIb-3. The concentration of these compounds is preferably 1-15% by weight.

[0965] - The LC medium contains one or more compounds of the formula XVIc, preferably compounds of the formula XVIc-1, XVIc-2 and / or XVIc-3. The concentration of these compounds is preferably 2-20% by weight.

[0966] - The LC medium contains one or more compounds selected from formulas XVIIa, XVIIb, and XVIIc, with compounds of formula XVIIa wherein L is H and compounds of formula XVIIb wherein L is F being preferred. The total concentration of these compounds is preferably 0.5-5% by weight.

[0967] - The LC medium contains one or more compounds of formula XX, preferably compounds of formula XXa. The concentration of these compounds is preferably 2-10% by weight.

[0968] - The LC medium contains one or more compounds of formula XXI, preferably compounds of formula XXIa. The concentration of these compounds is preferably 2-10% by weight.

[0969] - The LC medium contains one or more compounds of formula XXIII, preferably compounds of formula XXIIIa. The concentration of these compounds is preferably 0.5-5% by weight.

[0970] - The LC medium contains a combination of one or more compounds of formula XXIX and one or more compounds of formula XXX.

[0971] - The LC medium contains one or more compounds of formula XXIX, preferably compounds of formula XXIXa. The concentration of these compounds is preferably 1-10% by weight, more preferably 1.5-5% by weight.

[0972] - The LC medium contains one or more compounds of formula XXXa. The concentration of these compounds is preferably 2-10% by weight.

[0973] - The LC medium contains one or more compounds of formula XII. The concentration of these compounds is preferably 2-10% by weight.

[0974] - The LC medium comprises one or more compounds of formula I, S, P and / or B and one or more compounds of formulas YA to YG and B′, preferably of formula I-1, one or more compounds selected from YA-2, YA-9, YA-37, YA-41, YD-1, YG-2, II and / or III, one or more compounds selected from formulas Z1, Z2 and Z3 or their sub-formulas, one or more compounds selected from formula XIV, one or more compounds selected from formulas IV, VI, XX, XXIII and XXIX or their sub-formulas, and one or more compounds selected from formulas LP2-1, XVI, XVIIa, XVIIb, XVIIc or their sub-formulas.

[0975] - The LC medium comprises one or more compounds of formula I, preferably formula I-1, one or more compounds of formula P, S and / or B, and one or more compounds selected from YA-2, YA-9, YA-37, YA-41, YD-1, YG-2, II and / or III, one or more compounds selected from formula Z1, Z2, Z3, Z4 and Z5 or their derivatives, one or more compounds selected from formula XIVd or their derivatives, one or more compounds selected from formula IVc, VIb, XXa, XXIIIa and XXIXa or their derivatives, and one or more compounds selected from formula LP1-1b, XVIb, XVIc, XVIIa, XVIIb, XVIIc or their derivatives.

[0976] - The LC medium comprises one or more compounds of formula I, one or more compounds of formula P, S and / or B, and one or more compounds of formulas YA to YG and B, preferably formula I-1, one or more compounds selected from YA-2, YA-9, YA-37, YA-41, YD-1, YG-2, II and / or III, one or more compounds selected from formulas Z1, Z2 and Z3 or their derivatives, one or more compounds selected from formula XIV, one or more compounds selected from formulas II, III, IV, VI, XX, XXIII and XXIX or their derivatives, and one or more compounds selected from formulas LP2-1, XVI, XVIIa, XVIIb, XVIIc or their derivatives.

[0977] -LC media comprise one or more compounds of formula I, one or more compounds of formula P, S and / or B, and one or more compounds of formulas YA to YG and B, preferably formula I-1, one or more compounds selected from YA-2, YA-9, YA-37, YA-41, YD-1, YG-2, one or more compounds selected from formulas Z1, Z2, Z3, Z4 and Z5 or their sub-formulas, one or more compounds of formula B, preferably selected from formulas B1, B2 and B3, one or more compounds of formula XIVd or their sub-formulas, one or more compounds selected from formulas II, III, IVc, VIb, XXa, XXIIIa and XXIXa or their sub-formulas, and one or more compounds selected from formulas LP1-1b, XVIb, XVIc, XVIIa, XVIIb, XVIIc or their sub-formulas.

[0978] - In addition to compounds of formula I, one or more compounds of formula P, S and / or B, and one or more compounds of formulas YA to YG and B, the LC medium also contains one or more compounds of formula Z1-1 and one or more compounds of formula Z4-2 and / or Z4-3.

[0979] - In addition to compounds of formula I, S, P and / or B, LP1 and / or LP2, the LC medium also contains compounds selected from formulas Z1, Z2, Z3, IV, LP1-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subformulas.

[0980] - In addition to compounds of formula I, S, P and / or B, LP1 and / or LP2, the LC medium also contains compounds selected from formulas Z1, Z2, Z3, IV, LP2-1, XIV, XVI, XVIIa, XVIIb, XVIIc, XXI, XXIII, XXIX, XXX and XXIV or their subforms.

[0981] - The proportion of compounds of formula I, S, P and / or B in the LC medium is 0.5-20%, very preferably 1-20%, and most preferably 2-10% by weight.

[0982] - The proportion of compounds of formula Z1, Z2, Z3, Z4 and Z5 or their sub-formulas in the entire LC medium is 10-65% by weight, very preferably 20-60% by weight.

[0983] - The proportion of the compound of formula B or its sub-formula in the entire LC medium is 0-15% by weight, very preferably 2-10% by weight.

[0984] - The proportion of compounds of formulas II, III, IV-VIII, XVIII-XXIII and XXVII-XXX in the entire LC medium is 30-60% by weight.

[0985] - The proportion of the XIV and XV compounds in the entire LC medium is 5-20% by weight.

[0986] - The proportion of compounds of formula XIV, XVIIa-c and XXXII in the entire LC medium is 0.5-15% by weight.

[0987] The terms "alkyl" or "alky" used in this application "It covers straight-chain and branched alkyl groups having 1 to 6 carbon atoms, especially straight-chain groups such as methyl, ethyl, propyl, butyl, pentyl, and hexyl. Groups having 2 to 5 carbon atoms are generally preferred."

[0988] The term "alkenyl" or "alkeny" "This encompasses straight-chain and branched alkenyl groups having 2 to 6 carbon atoms, particularly straight-chain groups. Preferred alkenyl groups are C2-C7-1E-alkenyl and C4-C6-3E-alkenyl, especially C2-C6-1E-alkenyl. Particularly preferred examples of 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, particularly CH2=CH and CH3CH=CH."

[0989] The term "fluoroalkyl" preferably encompasses a straight-chain group with terminal fluorine, namely fluoromethyl, 2-fluoroethyl, 3-fluoropropyl, 4-fluorobutyl, 5-fluoropentyl, 6-fluorohexyl, and 7-fluoroheptyl. However, other positions of fluorine are not excluded.

[0990] The terms "oxaalkyl" or "alkoxy" preferably encompass the formula C n H 2n+1 -O-(CH2) m The linear group, wherein n and m each independently represent 1 to 6. m may also represent 0. Preferably, n=1 and m=1 to 6 or m=0 and n=1 to 3. More preferably, the alkoxy or oxaalkyl group may also contain one or more other O atoms such that the oxygen atoms are not directly connected to each other.

[0991] By appropriately selecting R in Equations II and III 0 and X 0The meaning of "address time," "threshold voltage," and "steepness of transmission characteristic lines" can be adjusted in a desired manner. For example, compared to alkyl and alkoxy groups, 1E-alkenyl, 3E-alkenyl, 2E-alkenyloxy groups typically result in shorter address times, improved nematic tendency, and a higher ratio between the elastic constants K3 (bending) and K1 (unfolding). Compared to alkyl and alkoxy groups, 4-alkenyl, 3-alkenyl groups typically offer lower threshold voltages and lower K3 / K1 values. The characteristics of the LC media according to the invention are particularly evident through a high Δε value, thus exhibiting a significantly faster response time than prior art LC media.

[0992] The optimal mixing ratio of the above-mentioned compounds depends primarily on the desired properties, the selection of the above-mentioned components, and the selection of any other components that may be present.

[0993] A suitable mixing ratio within the above range can be easily determined based on specific circumstances.

[0994] The total amount of the compounds of the above formula in the LC medium according to the present invention is not critical. Therefore, the LC medium may contain one or more other components for the purpose of optimizing various properties. However, the higher the total concentration of the compounds of the above formula, the greater the expected improvement in the properties of the medium is generally observed.

[0995] In a particularly preferred embodiment, the LC medium according to the invention comprises compounds of formulas IV to VIII (preferably IV and V), wherein X 0 The terms F, OCF3, OCHF2, OCH=CF2, OCF=CF2, or OCF2-CF2H are used. Favorable synergistic effects with compounds of formulas I, S, P, and / or B, II, and III result in particularly advantageous properties. In particular, LC media comprising compounds of formula I and one or more of formulas YA to YG and compounds of formulas B, II, and III are characterized by their low threshold voltages.

[0996] Individual compounds of the above formulas and their sub-formulas that can be used in the LC media according to the invention are known or can be prepared similarly to known compounds.

[0997] The present invention also relates to a method for preparing LC media as described above and below, which involves mixing one or more compounds of formula I, S, P and / or B with one or more mesocrystalline compounds and optionally one or more polymerizable compounds and / or one or more additives.

[0998] The LC medium of the present invention may optionally contain one or more polymerizable compounds. The polymerizable compounds are preferably selected from formula M.

[0999] R a -B 1 -(Z b -B2 ) m -R b M

[1000] Each substituent, when appearing in the same or different manner, and independently of the others, has the following meaning:

[1001] R a and R b It is P, P-Sp-, H, F, Cl, Br, I, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, SF5, or a straight-chain or branched alkyl group having 1 to 25 C atoms, wherein, in addition, one or more non-adjacent CH2 groups may be independently separated from each other by -C(R) 0 )=C(R 00 )-、-C≡C-、-N(R 00 -, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-, -O-CO-O- are substituted in such a way that O and / or S atoms are not directly connected to each other, and, furthermore, one or more H atoms can be substituted by F, Cl, Br, I, CN, P or P-Sp-, wherein if B 1 and / or B 2 If R contains saturated C atoms, then a and / or R b It can also represent a group that is spirotropically attached to the saturated C atom.

[1002] Wherein the substituent R a and R b At least one of them represents or contains the group P or P-Sp-,

[1003] P is a polymerizable group.

[1004] Sp is a spacer group or a single bond.

[1005] B 1 and B 2 Preferably, it is an aromatic, heteroaromatic, alicyclic, or heterocyclic group having 4 to 25 ring atoms, which may also contain a fused ring, and it is unsubstituted, or monosubstituted or polysubstituted with L.

[1006] Z b is -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-, -OCO-CH=CH-, CR 0 R 00 Or a single key,

[1007] R 0 and R 00 Each of these can independently represent H or an alkyl group having 1 to 12 carbon atoms.

[1008] m represents 0, 1, 2, 3, or 4.

[1009] n1 represents 1, 2, 3, or 4.

[1010] L is P, P-Sp-, OH, CH2OH, F, Cl, Br, I, -CN, -NO2, -NCO, -NCS, -OCN, -SCN, -C(=O)N(R x )2、-C(=O)Y 1 -C(=O)R x -N(R) x 2) Optionally substituted silyl groups, optionally substituted aryl groups having 6 to 20 carbon atoms, or straight-chain or branched alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy, or alkoxycarbonyloxy groups having 1 to 25 carbon atoms, wherein, in addition, one or more H atoms may be substituted by F, Cl, P, or P-Sp-.

[1011] P and Sp have the meanings described in the above formula M.

[1012] Y 1 Indicates halogen,

[1013] R x The symbol represents P, P-Sp-, H, halogen, a straight-chain, branched, or cyclic alkyl group having 1 to 25 C atoms, wherein, in addition, one or more non-adjacent CH2 groups may be replaced by -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- such that the O and / or S atoms are not directly connected to each other, wherein, 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.

[1014] More preferably, the LC medium according to the invention comprises one or more polymerizable compounds selected from Table H below.

[1015] Preferably, the proportion of polymerizable compounds (preferably selected from formula M and table H) in the LC medium is 0.01-5%, very preferably 0.05-1%, and most preferably 0.1-0.5%.

[1016] It has been observed that adding one or more polymerizable compounds, such as those selected from Formula M and Table H, to LC media results in advantageous properties, such as fast response time. This type of LC media is particularly suitable for PSA displays, exhibiting low image adhesion, rapid and complete polymerization, fast generation of low pretilt angles stable after UV exposure, high reliability, high VHR value after UV exposure, and high birefringence. By appropriately selecting the polymerizable compounds, the absorption of the LC media at longer UV wavelengths can be increased, allowing polymerization to be performed using these longer UV wavelengths, which is advantageous for display manufacturing processes.

[1017] The present invention also relates to the use of the LC medium according to the invention for electro-optical purposes, particularly for shutter glasses, for 3D applications, for 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, particularly displays of the foregoing types, comprising the LC medium according to the invention, particularly 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 displays.

[1018] The present invention also relates to an electro-optic display, such as an STN or matrix LC (MLC) display, having two planar parallel outer plates forming a cell together with a frame for switching integrated nonlinear elements of individual pixels on the outer plates, and a nematic LC medium having positive dielectric anisotropy and high resistivity located in the cell, wherein the nematic LC medium is an LC medium according to the present invention as described in the context.

[1019] The LC medium according to the present invention enables a significantly wider range of usable parameters. The achievable combination of clearing point, low-temperature viscosity, thermal and UV stability, and high optical anisotropy is far superior to previous materials of the prior art.

[1020] In particular, combinations of Formula I compounds with one or more Formula P, S and / or B compounds, and optionally with compounds selected from Formulas II-XXXII or their sub-formulas, result in LC media exhibiting moderate positive dielectric anisotropy, while simultaneously exhibiting an increased dielectric constant ε perpendicular to the longitudinal axis of the LC molecule. ⊥ This achieves energy-efficient LC displays with high contrast and transmittance, as well as low response time, while maintaining low rotational viscosity and a low ratio γ1 / K1.

[1021] The LC medium according to the present invention is suitable for mobile and TFT applications, such as mobile phones and PDAs. Furthermore, the LC medium according to the present invention is particularly suitable for FFS, HB-FFS, XB-FFS, and IPS displays based on dielectric positive liquid crystals.

[1022] According to the LC medium of the present invention, while maintaining the nematic phase at a temperature as low as -20°C, preferably as low as -30°C, particularly preferably as low as -40°C, and the clearing point at ≥75°C, preferably ≥80°C, a rotational viscosity γ1 ≤ 120 mPa·s, particularly preferably ≤ 100 mPa·s, is allowed, thus enabling the acquisition of an excellent MLC display with a fast response time. The rotational viscosity was measured at 20°C.

[1023] The dielectric anisotropy De of the LC dielectric according to the present invention at 20°C and 1 kHz is preferably ≥ +1.5, very preferably +2 to +18, and most preferably +3 to +10.

[1024] The birefringence Δn of the LC medium according to the present invention at 20°C is preferably 0.08 to 0.2, and very preferably 0.09 to 0.15.

[1025] The rotational viscosity γ1 of the LC medium according to the present invention is preferably ≤ 120 mPa·s, more preferably ≤ 110 mPa·s, and very preferably ≤ 90 mPa·s.

[1026] The ratio γ1 / K1 of the LC medium according to the present invention (where γ1 is the rotational viscosity and K1 is the elastic constant of the stretching deformation) is preferably ≤7 mPa·s / pN, very preferably ≤6 mPa·s / pN, and most preferably ≤5.5 mPa·s / pN.

[1027] The average elastic constant ratio K of the LC medium according to the present invention av Preferably at least 14.0 pN, very preferably at least 15.0 pN, and most preferably at least 16.0 pN. K av The following formula can be used for calculation:

[1028] .

[1029] The nematic phase range of the LC medium according to the invention preferably has a width of at least 70°C, more preferably at least 80°C, and particularly at least 90°C. This range preferably extends from -25°C to +90°C.

[1030] It goes without saying that by appropriately selecting the components of the LC medium according to the invention, a higher clearing point (e.g., above 100°C) can also be achieved at a higher threshold voltage, or a lower clearing point at a lower threshold voltage, while maintaining other advantageous properties. Similarly, an LC medium with a higher De and thus a lower threshold can be obtained with only a slight increase in viscosity. The MLC display according to the invention preferably operates at the first Gooch and Tarry transmission minimum [CH Gooch and HA Tarry, Electron. Lett. 10, 24, 1974; CH Gooch and HATarry, Appl. Phys., Vol. 8, 1575 1584, 1975], wherein, in addition to the particularly advantageous electro-optic properties, such as the high steepness of the feature lines and the low angular correlation of the contrast (German Patent 30 22 818), a lower dielectric anisotropy is sufficient at the same threshold voltage as in a similar display at the second minimum. This allows for a significantly higher resistivity value at a first minimum, compared to LC media containing cyano compounds. By appropriately selecting the individual components and their weight proportions, those skilled in the art can use simple, conventional methods to set the birefringence required for a predetermined layer thickness in an MLC display.

[1031] Measurements of voltage retention rate (HR) [S. Matsumoto et al., Liquid Crystals 5, 1320 (1989); K. Niwa et al., Proc. SID Conference, San Francisco, June 1984, 304 (1984); G. Weber et al., Liquid Crystals 5, 1381 (1989)] have shown that, compared with contained... cyanophenylcyclohexane or formula Compared to similar LC media containing esters, the LC media according to the invention comprising compounds of formulas ST-1, ST-2, RV, IA, and IB exhibit significantly smaller HR reductions during UV exposure.

[1032] The LC media according to the present invention exhibit significantly better light and UV stability, i.e., they show significantly less reduction in HR when exposed to light, heat, or UV.

[1033] The MLC display according to the present invention is constructed of a polarizer, an electrode substrate, and surface-treated electrodes, corresponding to the typical design of this type of display. The term "typical design" is described broadly herein and also includes all derivatives and modifications of MLC displays, particularly matrix display elements based on polysilicon TFTs or MIMs.

[1034] However, the significant difference between the display according to the present invention and conventional displays based on twisted nematic cells to date lies in the selection of LC parameters for the LC layer.

[1035] The LC medium used according to the invention can be prepared in its conventional manner, for example by mixing the compound of claim 1 with one or more compounds of formulas II-XXXII or with other LC compounds and / or additives. Typically, the required amount of the component used in a small quantity is dissolved in the component constituting the main component, advantageously at elevated temperatures. Alternatively, solutions of the components in organic solvents, such as acetone, chloroform, or methanol, can be mixed, and the solvent removed again after thorough mixing, for example by distillation.

[1036] The LC medium may also contain other additives known to those skilled in the art and described in the literature, such as polymerization initiators, inhibitors, surfactants, light stabilizers, antioxidants (e.g., BHT, TEMPOL), microparticles, free radical scavengers, nanoparticles, etc. For example, 0-15% of multicolor dyes or chiral dopants or initiators, such as Irgacure® 651 or Irgacure® 907, may be added. Suitable stabilizers and dopants are mentioned in Tables F and G below. In a preferred embodiment, the LC medium contains one or more stabilizers selected from Table G. Preferably, the proportion of stabilizers (e.g., those of formulas ST and H described above or listed in Table G) in the LC medium is 10-2000 ppm, very preferably 30-1000 ppm.

[1037] In addition, 0-15% by weight of multicolor dyes, nanoparticles, and conductive salts, preferably ammonium ethyl dimethyl dodecyl 4-hexyloxybenzoate, ammonium tetrabutyltetraphenylborate, or complex salts of crown ethers, can be added to the LC medium (see, for example, Haller et al., Mol. Cryst. Liq. Cryst). 24 Substances of this type, 249-258 (1973), are used to improve electrical conductivity or to alter dielectric anisotropy, viscosity, and / or the orientation of the nematic phase. Such substances are described, for example, in DE-A 22 09 127, 22 40 864, 23 21 632, 23 38 281, 24 50 088, 26 37 430, and 28 53 728.

[1038] For the purposes of this invention and in the following embodiments, the structures of the LC compounds are represented by acronyms and converted to chemical formulas according to Tables A through C below. All substituents C m H 2m+1 C n H 2n+1 and C l H 2l+1 Or C m H 2m-1 C n H 2n-1 and C l H 2l-1 It is a straight-chain alkyl or alkylene group, in each case having n, m, and l C atoms, respectively. Preferably, n, m, and l are 1, 2, 3, 4, 5, 6, or 7 independently of each other. Table A shows the codes for the ring elements of the compound core, Table B lists the bridging units, and Table C lists the symbol meanings for the left-hand and right-hand end groups of the molecule. Acronyms consist of the code for the ring element with an optional linking group, followed by the first hyphen and the code for the left-hand end group, and the second hyphen and the code for the right-hand end group. Table D shows the illustrative structure of the compound and its respective abbreviation.

[1039] Table A: Ring Elements

[1040]

[1041]

[1042]

[1043]

[1044] Table B: Bridging Units

[1045]

[1046] Table C: End groups

[1047]

[1048]

[1049] Where n and m are integers, and the three dots “…” are placeholders for other abbreviations in the table.

[1050] Use the following abbreviations:

[1051] (n, m, k, and l are each independent integers, preferably 1 to 12, more preferably 1 to 6; k and l can also be 0, preferably 0 to 4, more preferably 0 or 2, most preferably 2; n is preferably 1, 2, 3, 4, or 5, and in the combination "-nO-", it is preferably 1, 2, 3, or 4, more preferably 2 or 4; m is preferably 1, 2, 3, 4, or 5, and in the combination "-Om", it is preferably 1, 2, 3, or 4, more preferably 2 or 4. The combination "-lVm" is preferably "2V1".)

[1052] The preferred composition of the LC medium is shown in Tables D and E.

[1053] Table D

[1054]

[1055]

[1056]

[1057]

[1058]

[1059]

[1060] Table E

[1061] In the following formula, n and m each represent 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 independently, especially 2, 3, 5, and 0, 4, 6.

[1062]

[1063]

[1064]

[1065]

[1066]

[1067]

[1068]

[1069]

[1070]

[1071]

[1072]

[1073]

[1074]

[1075]

[1076]

[1077]

[1078]

[1079]

[1080]

[1081]

[1082]

[1083]

[1084]

[1085]

[1086]

[1087]

[1088]

[1089]

[1090]

[1091]

[1092]

[1093]

[1094]

[1095]

[1096]

[1097]

[1098] The LC medium is particularly preferred, which, in addition to the compounds of formula I and YA to YG and B, contains at least one, two, three, four or more compounds from Table E.

[1099] Table F

[1100] Table F shows possible dopants typically added to the LC medium according to the invention. The LC medium preferably contains 0-10% by weight, particularly 0.01-5% by weight, and especially preferably 0.01-3% by weight of dopants.

[1101]

[1102]

[1103] Table G

[1104] The stabilizers mentioned below can be added, for example, in amounts of 0-10% by weight to the LC media according to the invention.

[1105]

[1106] n = 1, 2, 3, 4, 5, 6 or 7

[1107]

[1108] n = 1, 2, 3, 4, 5, 6 or 7

[1109]

[1110] n = 1, 2, 3, 4, 5, 6, or 7 q = 1, 2, 3, 4, 5, 6, or 7

[1111]

[1112]

[1113]

[1114]

[1115]

[1116] q = 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10

[1117] Table H

[1118] Table H shows exemplary reactive mesocrystalline compounds (RM) that can be used in LC media according to the present invention.

[1119]

[1120]

[1121]

[1122]

[1123]

[1124]

[1125]

[1126]

[1127]

[1128]

[1129]

[1130]

[1131]

[1132]

[1133]

[1134]

[1135]

[1136]

[1137]

[1138]

[1139]

[1140]

[1141]

[1142]

[1143]

[1144]

[1145]

[1146]

[1147]

[1148]

[1149]

[1150]

[1151]

[1152]

[1153]

[1154]

[1155]

[1156]

[1157] The LC medium according to the invention may optionally contain one or more polymerizable compounds, preferably polymerizable compounds selected from formulas RM-1 to RM-184. Among 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, and RM-103 are particularly preferred. , 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.

[1158] The following examples are intended to explain the invention and not to limit it.

[1159] Percentages above and below are weight percentages. All temperatures are expressed in degrees Celsius. mp represents melting point, cl.p. = clearing point. Furthermore, C = crystalline, N = nematic, S = smectic, and I = isotropic. Data between these symbols represent transformation temperatures. Additionally, the following symbols are used:

[1160]

[1161] Δn represents the optical anisotropy at 20℃ and 589 nm.

[1162] At 20 °C and 1 kHz, the dielectric polarizability (or "dielectric constant") perpendicular to the molecular longitudinal axis is...

[1163] ε ‖ Dielectric polarizability (or "dielectric constant") parallel to the molecular longitudinal axis at 20 °C and 1 kHz.

[1164] Dielectric anisotropy at 20℃ and 1 kHz

[1165] cl.p. or T(N,I) clear the light [°C],

[1166] ν Flow viscosity measured at 20°C [mm] 2 ·s -1 ],

[1167] The rotational viscosity [mPa·s] of γ1 measured at 20°C.

[1168] K1 is the elastic constant, and the "bend" deformation at 20°C [pN].

[1169] K2 is the elastic constant, and the "torsional" deformation at 20°C [pN].

[1170] K3 is the elastic constant, the "bending" deformation at 20°C [pN], and

[1171] VHR (Voltage Holding Rate)

[1172] Unless otherwise expressly stated, all physical properties are determined according to "Merck Liquids Crystal, Physical Properties of Liquid Crystals", Status Nov. 1997, Merck KGaA, Germany, and are applicable to a temperature of 20°C. Detailed Implementation

[1173] Example

[1174] Comparative Example C1

[1175] The following is a configuration of a nematic LC medium:

[1176]

[1177] Mixture Example M1

[1178] The following is a configuration of a nematic LC medium:

[1179]

[1180] Compared to the mixture of Comparative Example C1, this mixture showed an increase in ε. ⊥ This results in increased transmittance in FFS LC displays.

[1181] Mixture Example S1 (Stable with compound of formula ST-2-3)

[1182] The nematic LC mixture according to the present invention is prepared as follows.

[1183]

[1184] Compared to the unstable mixture M1, the addition of 500 ppm of compound ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1185]

[1186] Mixture Example S1a (Stable with compound of formula ST-2-8)

[1187] The nematic LC mixture according to the present invention is prepared as follows.

[1188]

[1189] Compared to the unstable mixture M1, the addition of 500 ppm of compound ST-2-8 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1190]

[1191] Mixture Example M2

[1192] The following is a configuration of a nematic LC medium:

[1193]

[1194] Compared to the mixture of Comparative Example C1, this mixture exhibits increased ε⊥, which leads to increased transmittance in the FFS LC display.

[1195] Mixture Example S2 (Stable with compound of formula H-3-1)

[1196] The nematic LC mixture according to the present invention is prepared as follows.

[1197]

[1198] Compared to the unstable mixture M2, the addition of 500 ppm of compound H-3-1 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1199]

[1200] Mixture Example S2a (Stable with compound of formula H-3-22)

[1201] The nematic LC mixture according to the present invention is prepared as follows.

[1202]

[1203] Compared to the unstable mixture M2, the addition of 800 ppm of compound H-3-22 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1204]

[1205] Mixture Example M3

[1206] The following is a configuration of a nematic LC medium:

[1207]

[1208] Compared to the mixture of Comparative Example C1, this mixture exhibits increased ε⊥, which leads to increased transmittance in the FFS LC display.

[1209] Mixture Example S3 (Stable with compound of formula ST-4-2)

[1210] The nematic LC mixture according to the present invention is prepared as follows.

[1211]

[1212] Compared to the unstable mixture M3, the addition of 1000 ppm of compound ST-4-2 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1213]

[1214] Mixture Example M4

[1215] The following is a configuration of a nematic LC medium:

[1216]

[1217] Compared to the mixture of Comparative Example C1, this mixture exhibits increased ε⊥, which leads to increased transmittance in the FFS LC display.

[1218] Mixture Example S4 (Stable with compound of formula H-3-7)

[1219] The nematic LC mixture according to the present invention is prepared as follows.

[1220]

[1221] Compared to the unstable mixture M4, the addition of 500 ppm of compound H-3-7 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1222]

[1223] Mixture Example M5

[1224] The following is a configuration of a nematic LC medium:

[1225]

[1226] Compared to the mixture of Comparative Example C1, this mixture showed an increase in ε. ⊥ This results in increased transmittance in FFS LC displays.

[1227] Mixture Example S5 (Stable with compound of formula H-3-5)

[1228] The nematic LC mixture according to the present invention is prepared as follows.

[1229]

[1230] Compared to the unstable mixture M5, the addition of 50 ppm of compound H-3-5 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1231]

[1232] Mixture Example M6

[1233] The following is a configuration of a nematic LC medium:

[1234]

[1235] Mixture Example S6 (Stable with compound of formula ST-1-3)

[1236] The nematic LC mixture according to the present invention is prepared as follows.

[1237]

[1238] Compared to the unstable mixture M6, the addition of 400 ppm of compound ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1239]

[1240] Mixture Example M7

[1241] The following is a configuration of a nematic LC medium:

[1242]

[1243] Mixture Example S7 (Stable with compound of formula H-3-2)

[1244] The nematic LC mixture according to the present invention is prepared as follows.

[1245]

[1246] Compared to the unstable mixture M7, the addition of 50 ppm of compound H-3-2 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1247]

[1248] Mixture Example M8

[1249] The following is a configuration of a nematic LC medium:

[1250]

[1251] Mixture Example S8 (Stable with compound of formula H-3-4)

[1252] The nematic LC mixture according to the present invention is prepared as follows.

[1253]

[1254] Compared to the unstable mixture M8, the addition of 50 ppm of compound H-3-4 significantly improved VHR after UV exposure.100 This does not affect the remaining physical properties of the mixture.

[1255]

[1256] Mixture Example M9

[1257] The following is a configuration of a nematic LC medium:

[1258]

[1259] Mixture Example S9 (Stable with compound of formula H-3-10)

[1260] The nematic LC mixture according to the present invention is prepared as follows.

[1261]

[1262] Compared to the unstable mixture M9, the addition of 100 ppm of compound H-3-10 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1263]

[1264] Mixture Example M10

[1265] The following is a configuration of a nematic LC medium:

[1266]

[1267] Mixture Example S10 (Stable with compound of formula H-3-2)

[1268] The nematic LC mixture according to the present invention is prepared as follows.

[1269]

[1270] Compared to the unstable mixture M10, the addition of 50 ppm of compound H-3-2 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1271]

[1272] Mixture Example M11

[1273] The following is a configuration of a nematic LC medium:

[1274]

[1275] Mixture Example S11 (Stable with compound of formula H-3-3)

[1276] The nematic LC mixture according to the present invention is prepared as follows.

[1277]

[1278] Compared to the unstable mixture M11, the addition of 1000 ppm of compound H-3-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1279]

[1280] Mixture Example M12

[1281] The following is a configuration of a nematic LC medium:

[1282]

[1283] Mixture Example S12 (Stable with compound of formula H-3-6)

[1284] The nematic LC mixture according to the present invention is prepared as follows.

[1285]

[1286] Compared to the unstable mixture M12, the addition of 50 ppm of compound H-3-6 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1287]

[1288] Mixture Example M13

[1289] The following is a configuration of a nematic LC medium:

[1290]

[1291]

[1292] Mixture Example S13 (Stable with compound of formula H-3-8)

[1293] The nematic LC mixture according to the present invention is prepared as follows.

[1294]

[1295] Compared to the unstable mixture M13, the addition of 500 ppm of compound H-3-8 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1296]

[1297] Mixture Example M14

[1298] The following is a configuration of a nematic LC medium:

[1299]

[1300] Mixture Example S14 (Stable with compound of formula H-3-9)

[1301] The nematic LC mixture according to the present invention is prepared as follows.

[1302]

[1303] Compared to the unstable mixture M14, the addition of 50 ppm of compound H-3-9 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1304]

[1305] Mixture Example M15

[1306] The following is a configuration of a nematic LC medium:

[1307]

[1308] Mixture Example S15 (Stable with compound of formula H-3-11)

[1309] The nematic LC mixture according to the present invention is prepared as follows.

[1310]

[1311] Compared to the unstable mixture M15, the addition of 100 ppm of compound H-3-11 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1312]

[1313] Mixture Example M16

[1314] The following is a configuration of a nematic LC medium:

[1315]

[1316] Mixture Example S16 (Stable with compound of formula H-3-13)

[1317] The nematic LC mixture according to the present invention is prepared as follows.

[1318]

[1319] Compared to the unstable mixture M16, the addition of 100 ppm of compound H-3-13 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1320]

[1321] Mixture Example M17

[1322] The following is a configuration of a nematic LC medium:

[1323]

[1324] Mixture Example S17 (Stable with compound of formula H-3-14)

[1325] The nematic LC mixture according to the present invention is prepared as follows.

[1326]

[1327] Compared to the unstable mixture M17, the addition of 100 ppm of compound H-3-14 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1328]

[1329] Mixture Example M18

[1330] The following is a configuration of a nematic LC medium:

[1331]

[1332] Mixture Example S18 (Stable with compound of formula H-3-16)

[1333] The nematic LC mixture according to the present invention is prepared as follows.

[1334]

[1335] Compared to the unstable mixture M18, the addition of 100 ppm of compound H-3-16 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1336]

[1337] Mixture Example M19

[1338] The following is a configuration of a nematic LC medium:

[1339]

[1340] Mixture Example S19 (Stable with compound of formula H-3-17)

[1341] The nematic LC mixture according to the present invention is prepared as follows.

[1342]

[1343] Compared to the unstable mixture M19, the addition of 100 ppm of compound H-3-17 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1344]

[1345] Mixture Example M20

[1346] The following is a configuration of a nematic LC medium:

[1347]

[1348] Mixture Example S20 (Stable with compound of formula H-3-15)

[1349] The nematic LC mixture according to the present invention is prepared as follows.

[1350]

[1351] Compared to the unstable mixture M20, the addition of 100 ppm of compound H-3-15 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1352]

[1353] Mixture Example M21

[1354] The following is a configuration of a nematic LC medium:

[1355]

[1356] Mixture Example S21 (Stable with compounds of formula H-3-6 and ST-1-3)

[1357] The nematic LC mixture according to the present invention is prepared as follows.

[1358]

[1359] Compared with the unstable mixture M21, the addition of compounds H-3-6 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1360] Mixture Example M22

[1361] The following is a configuration of a nematic LC medium:

[1362]

[1363] Mixture Example S22 (Stable with compounds of formula H-3-1 and ST-1-3)

[1364] The nematic LC mixture according to the present invention is prepared as follows.

[1365]

[1366] Compared with the unstable mixture M22, the addition of compounds H-3-1 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1367] Mixture Example M23

[1368] The following is a configuration of a nematic LC medium:

[1369]

[1370] Mixture Example S23 (Stable with compounds of formula H-3-1 and ST-2-3)

[1371] The nematic LC mixture according to the present invention is prepared as follows.

[1372]

[1373] Compared with the unstable mixture M23, the addition of compounds of formulas H-3-1 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1374] Mixture Example M24

[1375] The following is a configuration of a nematic LC medium:

[1376]

[1377] Mixture Example S24 (Stable with compounds of formula H-3-3 and ST-1-3)

[1378] The nematic LC mixture according to the present invention is prepared as follows.

[1379]

[1380] Compared with the unstable mixture M24, the addition of compounds H-3-3 and ST-1-3 significantly improved VHR after UV exposure. 100This does not affect the remaining physical properties of the mixture.

[1381] Mixture Example M25

[1382] The following is a configuration of a nematic LC medium:

[1383]

[1384] Mixture Example S25 (Stable with compounds of formula H-3-4 and ST-2-3)

[1385] The nematic LC mixture according to the present invention is prepared as follows.

[1386]

[1387] Compared to the unstable mixture M25, the addition of compounds H-3-4 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1388] Mixture Example M26

[1389] The following is a configuration of a nematic LC medium:

[1390]

[1391] Mixture Example S26 (Stable with compounds of formula H-3-6 and ST-2-3)

[1392] The nematic LC mixture according to the present invention is prepared as follows.

[1393]

[1394] Compared with the unstable mixture M26, the addition of compounds H-3-6 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1395] Mixture Example M27

[1396] The following is a configuration of a nematic LC medium:

[1397]

[1398] Mixture Example S27 (stabilized with compounds of formula H-3-7 and ST-2-3)

[1399] The nematic LC mixture according to the present invention is prepared as follows.

[1400]

[1401] Compared with the unstable mixture M27, the addition of compounds H-3-7 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1402] Mixture Example M28

[1403] The following is a configuration of a nematic LC medium:

[1404]

[1405] Mixture Example S28 (Stable with compounds of formula H-3-8 and ST-1-3)

[1406] The nematic LC mixture according to the present invention is prepared as follows.

[1407]

[1408] Compared with the unstable mixture M28, the addition of compounds H-3-8 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1409] Mixture Example M29

[1410] The following is a configuration of a nematic LC medium:

[1411]

[1412] Mixture Example S29 (Stable with compounds of formula H-3-8 and ST-2-3)

[1413] The nematic LC mixture according to the present invention is prepared as follows.

[1414]

[1415] Compared with the unstable mixture M29, the addition of compounds H-3-8 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1416] Mixture Example M30

[1417] The following is a configuration of a nematic LC medium:

[1418]

[1419] Mixture Example S30 (Stable with compounds of formula H-3-8 and ST-4-2)

[1420] The nematic LC mixture according to the present invention is prepared as follows.

[1421]

[1422] Compared to the unstable mixture M30, the addition of compounds H-3-8 and ST-4-2 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1423] Mixture Example M31

[1424] The following is a configuration of a nematic LC medium:

[1425]

[1426] Mixture Example S31 (Stable with compounds of formula H-3-2 and ST-1-3)

[1427] The nematic LC mixture according to the present invention is prepared as follows.

[1428]

[1429] Compared with the unstable mixture M31, the addition of compounds H-3-2 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1430] Mixture Example M32

[1431] The following is a configuration of a nematic LC medium:

[1432]

[1433] Mixture Example S32 (Stable with compounds of formula H-3-2 and ST-2-3)

[1434] The nematic LC mixture according to the present invention is prepared as follows.

[1435]

[1436] Compared with the unstable mixture M32, the addition of compounds of formulas H-3-2 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1437] Mixture Example M33

[1438] The following is a configuration of a nematic LC medium:

[1439]

[1440] Mixture Example S33 (Stable with compounds of formula H-3-3 and ST-2-3)

[1441] The nematic LC mixture according to the present invention is prepared as follows.

[1442]

[1443] Compared with the unstable mixture M33, the addition of compounds of formulas H-3-3 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1444] Mixture Example M34

[1445] The following is a configuration of a nematic LC medium:

[1446]

[1447] Mixture Example S34 (Stable with compounds of formula H-3-3 and ST-1-3)

[1448] The nematic LC mixture according to the present invention is prepared as follows.

[1449]

[1450] Compared with the unstable mixture M34, the addition of compounds H-3-3 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1451] Mixture Example M35

[1452] The following is a configuration of a nematic LC medium:

[1453]

[1454] Mixture Example S35 (Stable with compounds of formula H-3-4 and ST-1-3)

[1455] The nematic LC mixture according to the present invention is prepared as follows.

[1456]

[1457] Compared to the unstable mixture M35, the addition of compounds H-3-4 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1458] Mixture Example M36

[1459] The following is a configuration of a nematic LC medium:

[1460]

[1461] Mixture Example S36 (Stable with compounds of formula H-3-4 and ST-2-3)

[1462] The nematic LC mixture according to the present invention is prepared as follows.

[1463]

[1464] Compared with the unstable mixture M36, the addition of compounds of formulas H-3-4 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1465] Mixture Example M37

[1466] The following is a configuration of a nematic LC medium:

[1467]

[1468] Mixture Example S37 (Stable with compounds of formula H-3-5 and ST-1-3)

[1469] The nematic LC mixture according to the present invention is prepared as follows.

[1470]

[1471] Compared to the unstable mixture M37, the addition of compounds H-3-5 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1472] Mixture Example M38

[1473] The following is a configuration of a nematic LC medium:

[1474]

[1475] Mixture Example S38 (Stable with compounds of formula H-3-5 and ST-2-3)

[1476] The nematic LC mixture according to the present invention is prepared as follows.

[1477]

[1478] Compared with the unstable mixture M38, the addition of compounds H-3-5 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1479] Mixture Example M39

[1480] The following is a configuration of a nematic LC medium:

[1481]

[1482] Mixture Example S39 (Stable with compounds of formula H-3-6 and ST-1-3)

[1483] The nematic LC mixture according to the present invention is prepared as follows.

[1484]

[1485] Compared with the unstable mixture M39, the addition of compounds H-3-6 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1486] Mixture Example M40

[1487] The following is a configuration of a nematic LC medium:

[1488]

[1489] Mixture Example S40 (stabilized with compounds of formula H-3-6 and ST-2-3)

[1490] The nematic LC mixture according to the present invention is prepared as follows.

[1491]

[1492] Compared to the unstable mixture M40, the addition of compounds H-3-6 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1493] Mixture Example M41

[1494] The following is a configuration of a nematic LC medium:

[1495]

[1496] Mixture Example S41 (Stable with compounds of formula H-3-7 and ST-1-3)

[1497] The nematic LC mixture according to the present invention is prepared as follows.

[1498]

[1499] Compared with the unstable mixture M41, the addition of compounds H-3-7 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1500] Mixture Example M42

[1501] The following is a configuration of a nematic LC medium:

[1502]

[1503] Mixture Example S42 (Stable with compounds of formula H-3-7 and ST-2-3)

[1504] The nematic LC mixture according to the present invention is prepared as follows.

[1505]

[1506] Compared with the unstable mixture M42, the addition of compounds H-3-7 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1507] Mixture Example M43

[1508] The following is a configuration of a nematic LC medium:

[1509]

[1510] Mixture Example S43 (Stable with compounds of formula H-3-8 and ST-1-3)

[1511] The nematic LC mixture according to the present invention is prepared as follows.

[1512]

[1513] Compared with the unstable mixture M43, the addition of compounds H-3-8 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1514] Mixture Example M44

[1515] The following is a configuration of a nematic LC medium:

[1516]

[1517] Mixture Example S44 (Stable with compounds of formula H-3-8 and ST-2-3)

[1518] The nematic LC mixture according to the present invention is prepared as follows.

[1519]

[1520] Compared with the unstable mixture M44, the addition of compounds H-3-8 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1521] Mixture Example M45

[1522] The following is a configuration of a nematic LC medium:

[1523]

[1524]

[1525] Mixture Example S45 (Stable with compounds of formula H-3-9 and ST-2-3)

[1526] The nematic LC mixture according to the present invention is prepared as follows.

[1527]

[1528] Compared to the unstable mixture M45, the addition of compounds H-3-9 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1529] Mixture Example M46

[1530] The following is a configuration of a nematic LC medium:

[1531]

[1532]

[1533] Mixture Example S46 (Stable with compounds of formula H-3-9 and ST-1-3)

[1534] The nematic LC mixture according to the present invention is prepared as follows.

[1535]

[1536] Compared with the unstable mixture M46, the addition of compounds H-3-9 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1537] Mixture Example M47

[1538] The following is a configuration of a nematic LC medium:

[1539]

[1540] Mixture Example S47 (Stable with compounds of formula H-3-10 and ST-1-3)

[1541] The nematic LC mixture according to the present invention is prepared as follows.

[1542]

[1543] Compared with the unstable mixture M47, the addition of compounds H-3-10 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1544] Mixture Example M48

[1545] The following is a configuration of a nematic LC medium:

[1546]

[1547]

[1548] Mixture Example S48 (Stable with compounds of formula H-3-10 and ST-2-3)

[1549] The nematic LC mixture according to the present invention is prepared as follows.

[1550]

[1551] Compared with the unstable mixture M48, the addition of compounds H-3-10 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1552] Mixture Example M49

[1553] The following is a configuration of a nematic LC medium:

[1554]

[1555]

[1556] Mixture Example S49 (Stable with compounds of formula H-3-11 and ST-1-3)

[1557] The nematic LC mixture according to the present invention is prepared as follows.

[1558]

[1559] Compared with the unstable mixture M49, the addition of compounds H-3-11 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1560] Mixture Example M50

[1561] The following is a configuration of a nematic LC medium:

[1562]

[1563] Mixture Example S50 (stabilized with compounds of formula H-3-11 and ST-2-3)

[1564] The nematic LC mixture according to the present invention is prepared as follows.

[1565]

[1566] Compared to the unstable mixture M50, the addition of compounds H-3-11 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1567] Mixture Example M51

[1568] The following is a configuration of a nematic LC medium:

[1569]

[1570] Mixture Example S51 (Stable with compounds of formula H-3-12 and ST-1-3)

[1571] The nematic LC mixture according to the present invention is prepared as follows.

[1572]

[1573] Compared with the unstable mixture M51, the addition of compounds H-3-12 and ST-1-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

[1574]

[1575] Mixture Example M52

[1576] The following is a configuration of a nematic LC medium:

[1577]

[1578]

[1579] Mixture Example S52 (Stable with compounds of formula H-3-12 and ST-2-3)

[1580] The nematic LC mixture according to the present invention is prepared as follows.

[1581]

[1582] Compared with the unstable mixture M52, the addition of compounds H-3-12 and ST-2-3 significantly improved VHR after UV exposure. 100 This does not affect the remaining physical properties of the mixture.

Claims

1. A liquid crystal medium having positive dielectric anisotropy, characterized in that, It contains one or more compounds of formula I. Each substituent has the following meaning: R 1 and R 2 Each of the above independently represents an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , -O-, -CO-O- or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl or cycloalkoxy groups having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; R 3 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3; L 1 and L 2 Each of them independently represents F, Cl, CF3, or CHF2; preferably, L 1 and L 2 Both represent F; and One or more compounds selected from compounds of formulas P, S, and B: in and Each time it appears, it is independent of each other. R 0 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , -O-, -CO-O- or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl or cycloalkoxy groups having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; L 1 and L 2 H or F can be represented independently of each other, with L being preferred. 2 F represents Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3; X 0 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 6 carbon atoms, or halogenated alkenyl or alkenyloxy groups having 2 or 6 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2, or -CF3, with F, -CF3, -CHF2, -OCHF2, or -OCF3 being particularly preferred. Z 3 This indicates -CH2CH2-, -CF2CF2-, -COO-, -OCO-, trans -CH=CH-、 trans- CF = CF-, -CH2O-, -OCH2- or a single bond, preferably -CH2CH2-, -COO-, trans- CH=CH- or a single bond, with -COO- being the most preferred. trans- CH=CH- or a single bond, and n represents 0, 1, 2 or 3, preferably 1, 2 or 3, and especially preferably 1; Each substituent, when appearing in the same or different manner, and independently of each other, has the following meaning: express R 1 and R 2 Each of the following independently represents an H atom, a halogen atom, an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenoxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; L 1 To L 4 Each can be represented independently of the other, such as H, F, or Cl. Y 1 To Y 3 Each of the groups independently represents an H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3; Z 1 This indicates -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 represents 0, 1, 2, or 3; Each substituent has the following meaning: express R 21 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; X 3 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 3 carbon atoms, or halogenated alkenyl or alkenyloxy groups having 2 or 3 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2, or -CF3, with F, Cl, -O-CH=CF2, -OCHF2, or -OCF3 being particularly preferred. L 1 and L 2 Each can be represented independently as F, Cl, CF3, or CHF2; L 3 and L 4 Each can be represented independently of the other, either H or F; Z represents a single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -COO-, -OCO-, -C2F4-, -CF=CF-, -CH=CHCH2O; Y represents S or O, CH2, CH2CH2, CH2O, OCH2, CH=CH; l can be 0 or 1.

2. The medium according to claim 1, characterized in that, The one or more compounds of formula P are selected from the following: in R 0 This indicates an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl, or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; X 0 The terms represent halogens, halogenated alkyl or alkoxy groups having 1 to 3 carbon atoms, or halogenated alkenyl or alkenoxy groups having 2 or 3 carbon atoms, F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2 or -CF3, with F, -CF3, -CHF2, -OCHF2 or -OCF3 being most preferred. L 1 To L 4 Each can be represented independently of the other, such as H, F, or Cl. Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3; Z 0 The terms -C2H4-, -(CH2)4-, -CH=CH-, -CF=CF-, -C2F4-, -CH2CF2-, -CF2CH2-, -CH2O-, -OCH2-, -COO-, -CF2O-, or -OCF2- are represented, and in formulas V and VI, they also represent single bonds; and s represents 0 or 1.

3. The medium according to claim 1, characterized in that, The one or more compounds of formula P are selected from the following: Where R 0 X 0 Y 0 and L 1-4 Each of them independently has one of the meanings shown in claims 2, IV to VIII.

4. The medium according to claim 1, characterized in that, The one or more compounds of formula P are selected from the following: in express R 0 X 0 and Y 0 Each of the four formulas IV to VIII in claims 2 has R 0 X 0 and Y 0 The meaning shown.

5. The medium according to one or more of claims 1 to 4, characterized in that, It comprises one or more compounds selected from formulas YA, YB, YC, YD, YE, YF, YG, and B': Each substituent has the following meaning: express R 21 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced in such a way that the O atoms are not directly connected to each other, and one or more H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more H atoms may be replaced by halogen atoms; R 22 This indicates an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The H atoms are replaced in such a way that the O atoms are not directly connected to each other, and one or more H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more H atoms may be replaced by halogen atoms; L 1 and L 2 Each can be represented independently as F, Cl, CF3, or CHF2; L 3 and L 4 Each can be represented independently of the other, either H or F; R 23 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3; Z 1 and Z 2 Each of these can be used independently to represent a single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -COO-, -OCO-, -C2F4-, -CF=CF-, -CH=CHCH2O; Z represents -CH2O-, -O-, -C2H4-, -OCH2-, or a single bond; Y represents S or O, CH2, CH2CH2, CH2O, OCH2, CH=CH; p represents 0, 1, or 2; q represents 0 or 1; r represents 1 or 2; as well as l represents 0 or 1.

6. The medium according to claim 5, characterized in that, The one or more compounds selected from formulas YA, YB, YC, YD, YE, YF, YG, and B are selected from the following compounds: in R 21 and R 22 Each of these groups independently represents an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl, cycloalkenyl, or cycloalkoxy groups having 3 to 6 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; R 23 The symbol represents an H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, preferably H or CH3.

7. The medium according to one or more of claims 1 to 6, characterized in that, It contains one or more compounds selected from the following formula: Each substituent has the following meaning: express express R 0 Having the R of claim 1 1 and R 2 One of the meanings given is X 0 The symbol represents a halogen atom, -CN, -SCN, -NCS, or an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenoxy group having 2 to 6 carbon atoms, wherein one or more H atoms are substituted with halogen atoms, preferably F, CF3, CHF2, OCHF2, or OCF3. L 1 To L 6 Each can be represented independently of H, F, or Cl. Y 0 The H atom, an alkyl group having 1 to 3 C atoms, or an alkenyl group having 2 to 3 C atoms, wherein one or more non-adjacent CH2 groups are optionally replaced by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, preferably H or CH3.

8. The medium according to claim 7, wherein one or more compounds of formula II are selected from the following sub-formulas: Where R 0 and X 0 It has the meaning given in Equation II.

9. The medium according to claim 7, wherein one or more compounds of formula III are selected from the following sub-formulas: Where R 0 and X 0 It has the meaning given in Equation III.

10. The medium according to one or more of claims 1 to 9, characterized in that, It contains one or more compounds selected from formulas N1 and N2: in and Independent of each other, and if If they appear twice, they represent each other independently. Z 41 and Z 42 Independent of each other and if Z 41 If they appear twice, they also independently represent -CH2CH2-, -COO-, trans- CH=CH-、 trans- CF = CF-, -CH2O-, -CF2O-, -C≡C- or a single bond. p represents 0, 1, or 2. R 41 and R 42 Each of the above independently represents an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; to If they exist, they are represented independently of each other. R 51 and R 52 Each has its own R independently 41 and R 42 The meaning; Z 51 To Z 53 Each possesses Z independently of the others. 41 and Z 42 The meaning of, and i and j each represent 0 or 1 independently. One or more of these, preferably one aromatic ring, may optionally be substituted with an alkyl group, preferably with a methyl group.

11. The medium according to one or more of claims 1 to 10, characterized in that, It contains one or more compounds selected from the following formula: Each substituent has the following meaning: "alkyl" and "alky" Each of these terms independently represents an alkyl group having 1 to 6 carbon atoms; "alkenyl" and "alkeny" Each of them independently represents an alkenyl group having 2 to 6 carbon atoms.

12. The medium according to one or more of claims 1 to 11, characterized in that, Its included compound Z1-1: 。 13. The medium according to one or more of claims 1 to 12, characterized in that, It contains one or more compounds selected from the following formula: Among them, R 1 and R 2 Each independently represents an alkyl, alkoxy, oxalyl, or fluoroalkyl group having 1 to 6 carbon atoms, or an alkenyl group having 2 to 6 carbon atoms; and L 1 L and H can be used independently to represent H, F, or Cl.

14. The medium according to one or more of claims 1 to 13, characterized in that, It also contains one or more compounds selected from formulas LP1 and LP2. Each substituent has the following meaning: R 0 and R 2 This indicates an alkyl or alkoxy group having 1 to 12 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally surrounded by -C≡C-, -CF2O-, -OCF2-, , , , , -O-, -CO-O-, or -O-CO- are substituted in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be substituted by cycloalkyl or cycloalkoxy groups having 3 to 12 C atoms; L 1 and L 2 Each can be represented independently of the other, such as H, F, or Cl. Y 0 The H atom, an alkyl group having 1 to 3 carbon atoms, or an alkenyl group having 2 to 3 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally substituted with -C≡C-, -CF2O-, -OCF2-, -O-, -CO-O-, or -O-CO- such that the O atoms are not directly connected to each other, preferably H or CH3; and X 0 It represents a halogen atom, -CN, -SCN, -NCS, or an alkyl or alkoxy group having 1 to 6 carbon atoms, or an alkenyl or alkenoxy group having 2 to 6 carbon atoms, wherein one or more H atoms are substituted by a halogen atom.

15. The medium according to one or more of claims 1 to 14, characterized in that, The medium contains one or more H compounds. in R 11 Each of these groups independently represents an H atom, F, or an alkyl group having 1 to 20 C atoms, wherein one or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or more -CH2- groups, if present, can be replaced by -CH=CH- or -C≡C-, and one or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Replacement R 12 Each of the above is an alkyl group, each independently representing an H atom, having 1 to 20 C atoms, wherein one or more -CH2- groups can be substituted with -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted with -O-; a hydrocarbon group containing a cycloalkyl or alkylcycloalkyl unit, wherein one or more -CH2- groups can be substituted with -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted with -O-; and one or more H atoms can be substituted with F, OR 13 、N(R 13 (R) 14 ) or R 15 Substitution, or aromatic or heteroaromatic hydrocarbon group, in which one or more H atoms can be ORed 13 、N(R 13 (R) 14 ) or R 15 Replacement R 13 and R 14 Each of these groups independently represents an alkyl or acyl group having 1 to 10 carbon atoms, or an aromatic hydrocarbon or carboxylic acid group having 6 to 12 carbon atoms. R 15 Each of these groups independently represents an alkyl group having 1 to 10 carbon atoms. One or more -CH2- groups may be substituted with -O- or -C(=O)-, but two adjacent -CH2- groups cannot be substituted with -O-. R 16 Each of these can be independently represented by an H atom, an alkyl or alkoxy group having 1 to 10 carbon atoms, an O-cycloalkyl group having 3 to 12 carbon atoms, or an O· or OH group. S 11 and S 12 Each of these terms independently represents an alkylene group having 1 to 20 carbon atoms, wherein one or more -CH2- groups, if present, can be replaced by -O- or -C(=O)-, but two adjacent -CH2- groups cannot be replaced by -O-, and one or more H atoms can be replaced by F, OR 13 、N(R 13 (R) 14 ) or R 15 Substitution, or indicating a single bond, Y 11 To Y 14 Each can independently represent either methyl or ethyl. X 11 C represents... Z 11 To Z 14 Each of these can be represented independently as -O-, -(C=O)-, -O-(C=O)-, -(C=O)-O-, -O-(C=O)-O-, -(NR-). 13 )-、-NR 13 -(C=O)- or a single bond, if S 11 It is a single key; Z 11 and Z 12 The two cannot both represent -O-; if S 12 If it is a single bond, then Z 13 and Z 14 Both cannot simultaneously represent -O-; and if q represents 0, then Z 12 and Z 13 The two cannot both represent -O-. p represents 1 or 2, q represents 0 or 1. o represents (3-p), n represents an integer from 1 to 10. m represents an integer from 0 to 8, where n p represents an integer from 1 to 10, preferably from 3 to 8, and This represents an organic moiety with (m+n) bonding sites.

16. The medium according to one or more of claims 1 to 15, characterized in that, The medium contains one or more ST compounds: Each substituent has the following meaning: express , or ; X 21 X 22 Each can be represented independently as -O-, -CH2-, or -CHR. 23 -or-NR 23 -, R 21 and R 22 Each of the following groups independently represents an H atom or an alkyl or alkoxy group having 1 to 12 carbon atoms, an alkenyl, ynyl, alkenoxy, or alkoxyalkyl group having 2 to 12 carbon atoms, or a cycloalkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent CH2 groups are optionally represented by -C≡C-, -CF2O-, -OCF2-, -CH=CH-, , , , , The following are substituted with -O-, -CO-O-, or -O-CO- in such a way that the O atoms are not directly connected to each other, and one or more of the H atoms may be replaced by halogen atoms, or cycloalkyl or cycloalkoxy having 3 to 12 C atoms, wherein one or more of the H atoms may be replaced by halogen atoms; R 23 Represents an H atom, an alkyl or alkoxy group having 1 to 10 C atoms, r represents 0 or 1.

17. The medium according to one or more of claims 1 to 16, characterized in that, The medium contains one or more additives selected from polymerization initiators, inhibitors, surfactants, light stabilizers, antioxidants, microparticles, free radical scavengers, nanoparticles, multicolor dyes, and chiral dopants.

18. A method for preparing a liquid crystal medium according to one or more of claims 1 to 17, characterized in that, Mix one or more compounds of formula B and one or more compounds of formula C with one or more mesocrystalline compounds and optionally one or more polymerizable compounds and / or one or more additives.

19. Use of the liquid crystal medium according to one or more of claims 1 to 17 for electro-optical purposes.

20. An electro-optical liquid crystal display or an AR / VR head-mounted device, comprising a liquid crystal medium according to one or more of claims 1 to 17.

21. The electro-optical liquid crystal display according to claim 20, characterized in that, These include 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-stabilized SA-HB-FFS, polymer-stabilized SA-XB-FFS, positive VA, or positive PS-VA displays.

22. The electro-optical liquid crystal display or AR / VR head-mounted device according to claim 21, characterized in that, It is an FFS, HB-FFS, XB-FFS, PS-HB-FFS, PS-XB-FFS, IPS, or PS-IPS display.

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