Liquid crystal medium and liquid crystal display containing the same

Abstract

To provide a liquid crystal medium used in active-matrix displays based on the IPS or FFS effect.SOLUTION: A liquid crystal medium is provided containing a compound of the formula T, and a compound having a specific cyclohexylcyclohexenylbenzene structure. (In the formula, RS1 and RS2 each represent an alkyl group, alkoxy group, or the like, and YS1 and YS2 each represent H or F.)SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to new compounds, new liquid crystal media, in particular for use in liquid crystal displays, and to these liquid crystal displays, in particular liquid crystal displays using IPS (in-plane switching) or dielectrically positive liquid crystals, preferably using the FFS (fringe field switching) effect. [Background technology]

[0002] The media are distinguished in the respective displays by particularly high transmittance and short response times, due to a unique combination of physical properties, particularly high elastic constants, especially high k 11 , and the rotational viscosity (γ1) and elastic constant (k 11 ) with an excellent low ratio (γ1 / k 11 ) which also leads to their excellent performance in displays according to the invention.

[0003] IPS and FFS displays, which use dielectrically positive liquid crystals, are well known in the art and have been widely adopted in various types of displays, such as notebooks, desktop monitors and TV sets, as well as for portable applications.

[0004] Recently, however, IPS and especially FFS displays using dielectrically negative liquid crystals have been widely adopted. FFS displays using dielectrically negative liquid crystals are sometimes called UB-FFS (ultra bright FFS). Such displays are disclosed in U.S. Patent Application Publication No. 2013 / 0207038. These displays are characterized by significantly increased transmittance compared to previously used IPS and FFS displays using dielectrically positive liquid crystals. However, these displays using dielectrically negative liquid crystals have the significant disadvantage of requiring higher operating voltages than the respective displays using dielectrically positive liquid crystals. The liquid crystal medium used in UB-FFS has a dielectric anisotropy of -0.5 or less, preferably -1.5 or less.

[0005] According to the present application, however, an IPS or FFS effect with a dielectrically positive liquid crystal medium in homogeneous alignment is preferred.

[0006] The industrial application of this effect in electro-optical display elements requires LC phases that satisfy a number of requirements, of which particularly important are chemical resistance to moisture, air, and physical influences such as heat, radiation in the infrared, visible and ultraviolet regions, and direct current (DC) and alternating current (AC) electric fields.

[0007] Furthermore, commercially usable LC phases are required to have a liquid crystal mesophase within a suitable temperature range and low viscosity.

[0008] The series of compounds having liquid crystal mesophases disclosed to date does not include a single compound that fulfills all of these requirements, and therefore, to obtain a material that can be used as an LC phase, a mixture of 2 to 25 compounds, preferably 3 to 18 compounds, is generally prepared.

[0009] Matrix liquid-crystal displays (MLC displays) are known. Nonlinear elements that can be used to switch each individual pixel are, for example, active elements (i.e., transistors). The term "active matrix" is used to refer to thin-film transistors (TFTs), which are typically arranged on a glass plate as a substrate.

[0010] Two technologies are distinguished: TFTs containing compound semiconductors such as CdSe or metal oxides such as ZnO, and TFTs based on polycrystalline silicon, especially amorphous silicon. The latter technology is currently of greatest commercial importance worldwide.

[0011] One glass plate of the display has a TFT matrix on its inside, while the other glass plate carries a transparent counter electrode on its inside. Compared to the size of the pixel electrodes, the TFTs are very small and have virtually no adverse effect on the image. This technology can also be extended to full-color displays, in which a mosaic of red, green, and blue filters is arranged so that a filter element faces each switchable pixel.

[0012] The most widely used TFT displays to date are usually operated in transmission with crossed polarizers and backlit. For television applications, ECB (or VAN) or FFS cells are used, while monitors usually use IPS or TN (twisted nematic) cells, and notebooks, laptops and mobile applications usually use TN, VA or FFS cells.

[0013] The term MLC display is used herein to cover any matrix display with integrated non-linear elements, i.e. displays that, in addition to the active matrix, also comprise passive elements such as varistors or diodes (MIM, i.e. metal-insulator-metal).

[0014] This type of MLC display is particularly suitable for television applications, monitors and notebooks, or for high-density information displays, for example in automobile manufacturing or aircraft cabins. In addition to problems related to the angular dependence of contrast and response time, MLC displays also suffer from problems due to the liquid crystal mixture not having a sufficiently high resistivity [TOGASHI, S., SEKIGUCHI, K., TANABE, H., YAMAMOTO, E., SORIMACHI, K., TAJIMA, E., WATANABE, H., SHIMIZU, H., Proc. Eurodisplay, Vol. 84, September 1984, A210-288, "Matrix LCD Controlled by Double Stage Diode Rings", p. 141ff, Paris (Non-Patent Document 1); STROMER, M., Proc. Eurodisplay, Vol. 84, September 1984, "Design of Thin Film Transistors for Matrix Addressing of Television Liquid Crystal Displays", p. 145ff, Paris (Non-Patent Document 2)]. As the resistance decreases, the contrast of the MLC display deteriorates. Because the resistivity of the liquid crystal mixture generally decreases over the lifetime of an MLC display due to interactions with the display's internal surfaces, a high (initial) resistance is crucial for the display to have acceptable resistance values ​​over long periods of operation.

[0015] In a general way, the techniques are compared, for example, in Souk Jun, SID Seminar 2004, Seminar M-6: "Recent Advances in LCD Technology", Seminar Lecture Notes, M-6 / 1 to M-6 / 26 (Non-Patent Document 3) and Miller, Ian, SID Seminar 2004, Seminar M-7: "LCD-Television", Seminar Lecture Notes, M-7 / 1 to M-7 / 32 (Non-Patent Document 4). Although the response time of modern ECB displays has already been significantly improved by overdrive addressing methods, e.g., Kim, Hyeon Kyeong et al., Paper 9.1: "A57-in. Wide UXGA TFT-LCD for HDTV Application", SID 2004 International Symposium, Digest of Technical Papers, XXXV, Book I, pp. 106-109 (Non-Patent Document 5), achieving video-compatible response times, especially in grayscale (grey-out) switching, is still a problem that has not yet been satisfactorily solved.

[0016] In this type of liquid crystal display, liquid crystal is used as a dielectric whose optical properties change reversibly upon application of a voltage.

[0017] In general, in displays, that is, in displays due to these effects already mentioned, the operating voltage must be as low as possible, so liquid-crystalline media are generally mainly composed of liquid-crystalline compounds that all have the same sign of dielectric anisotropy and the highest possible value of dielectric anisotropy.In general, relatively small amounts of neutral compounds are used, and compounds with a dielectric anisotropy of the opposite sign to that of the medium are avoided as much as possible.Thus, for example, in the case of liquid-crystalline media with negative dielectric anisotropy for ECB or UB-FFS displays, compounds with negative dielectric anisotropy are mainly used.The individual liquid-crystalline media used generally mainly, and more usually, essentially, consist of liquid-crystalline compounds with negative dielectric anisotropy.

[0018] In the media used by the present application, since liquid crystal displays are generally intended to have as low an address voltage as possible, significant amounts of dielectrically positive liquid crystal compounds and generally only very small amounts of dielectrically negative compounds, or even no dielectrically negative compounds, are typically used, while in some cases small amounts of dielectrically neutral compounds can be beneficially used.

[0019] Liquid-crystalline media with positive dielectric anisotropy for IPS and FFS displays have already been disclosed. Some examples are given below.

[0020] DE 102016003902.3 A1, EP 3 081 620 A1 and EP 3 095 834 A1 relate to liquid crystal compounds and liquid crystal media, respectively, for use in the respective displays.

[0021] The present applicant's pending but unpublished European Patent Applications No. 17164891.8 (Patent Document 5), No. 16190393.5 (Patent Document 6), No. 16194162.0 (Patent Document 7), No. 16197206.2 (Patent Document 8) and No. 16199580.8 (Patent Document 9) also relate to liquid crystal compounds and liquid crystal media, respectively, for use in the respective displays.

[0022] A compound of the formula:

[0023] [ka] is disclosed in DE 10 2010 027 099 A1 (Patent Document 10).

[0024] European Patent Application No. 19185360.5 (Patent Document 11), which has not yet been published, discloses compounds of the formula:

[0025] [ka] (PUS-nT, n=3), and a compound of the formula:

[0026] [ka] (CLP-Vn, n=1), and another one additionally:

[0027] [ka] (CLP-nT, n=3) is disclosed.

[0028] Obviously, for the intended application of the display the nematic phase range of the liquid crystal mixture must be sufficiently wide.

[0029] Furthermore, the response time of the liquid-crystalline medium in the display must be improved, i.e., shortened. This is particularly important for displays for television and multimedia applications, as well as for gaming, monitors, and notebooks. In order to improve the response time, it has repeatedly been proposed in the past to optimize the rotational viscosity (γ1) of the liquid-crystalline medium, i.e., to achieve a medium with the lowest possible rotational viscosity. However, the results achieved here are insufficient for many applications, and therefore it appears desirable to find further optimization methods.

[0030] Adequate stability of the medium against extreme stresses, especially UV exposure and heat, is very particularly important, which can be crucial especially for display applications in mobile devices such as mobile phones.

[0031] In addition to the relatively poor transmittance and relatively long response time of MLC displays, previously disclosed MLC displays have further drawbacks, such as their relatively low contrast, relatively high viewing angle dependence, and difficulty in reproducing grayscales (gray-out) in these displays, especially when viewed from oblique viewing angles, as well as their poor VHR and poor lifetime. Desirable improvements in display transmittance and response time are needed to improve the energy efficiency of MLC displays and to improve the ability of individual MLC displays to accommodate fast-moving images.

[0032] Therefore, there continues to be a strong demand for MLC displays that have very high resistivity, a wide operating temperature range, a short response time, and a low threshold voltage, which allow for the generation of various gray levels (gray shading), and in particular, good and stable VHR. [Prior art documents] [Patent documents]

[0033] [Patent Document 1] US Patent Application Publication No. 2013 / 0207038 [Patent Document 2] German Patent Application Publication No. 102016003902.3 [Patent Document 3] European Patent Application Publication No. 3 081 620 [Patent Document 4] European Patent Application Publication No. 3 095 834 [Patent Document 5] European Patent Application No. 17164891.8 [Patent Document 6] European Patent Application No. 16190393.5 [Patent Document 7] European Patent Application No. 16194162.0 [Patent Document 8] European Patent Application No. 16197206.2 [Patent Document 9] European Patent Application No. 16199580.8 [Patent Document 10] German Patent Application Publication No. 10 2010 027 099 A1 [Patent Document 11] European Patent Application No. 19185360.5 [Non-patent literature]

[0034] [Non-Patent Document 1] TOGASHI, S., SEKIGUCHI, K., TANABE, H., YAMAMOTO, E., SORIMACHI, K., TAJIMA, E., WATANABE, H., SHIMIZU, H., Proc. Eurodisplay, Vol. 84, September 1984, A210-288, "Matrix LCD Controlled by Double Stage Diode Rings", pp. 141ff, Paris [Non-patent document 2] STROMER, M., "Design of Thin Film Transistors for Matrix Addressing of Television Liquid Crystal Displays", Proc. Eurodisplay, Vol. 84, September 1984, pp. 145ff, Paris [Non-patent document 3] Souk Jun, SID Seminar 2004, Seminar M-6: "Recent Advances in LCD Technology", Seminar Lecture Notes, M-6 / 1~M-6 / 26 [Non-patent document 4] Miller, Ian, SID Seminar 2004, Seminar M-7: "LCD-Television", Seminar Lecture Notes, M-7 / 1~M-7 / 32 [Non-patent document 5] Kim, Hyeon Kyeong et al., Paper 9.1: "A57-in.Wide UXGA TFT-LCD for HDTV Applications," SID 2004 International Symposium, Digest of Technical Papers, XXXV, Book I, pp. 106-109 Summary of the Invention [Problem to be solved by the invention]

[0035] The present invention aims to provide MLC displays based on the ECB, IPS or FFS effect that do not have or have reduced defects as indicated above and at the same time have very high resistivity values, not only for monitor and television applications but also for gaming and mobile applications such as telephones and navigation systems, where functionality must be guaranteed even at extremely high and low temperatures. [Means for solving the problem]

[0036] It has surprisingly been found that by using nematic liquid crystal mixtures comprising at least one, preferably two or more compounds of formula T (the compounds of formula T are preferably selected from the group of compounds of sub-formulae T-1 and T-2) and one or more compounds of formula L (the compounds of formula L are preferably selected from the group of compounds of sub-formulae L-1 and L-2), preferably additionally at least one compound, preferably two or more compounds selected from the group of compounds of formulae II and III (the compounds of formula II are preferably compounds of sub-formulae II-1 and / or II-2), and / or at least one compound, preferably two or more compounds selected from the group of compounds of formulae IV and / or V (all formulae as defined hereinafter), it is possible to achieve liquid crystal displays, in particular in IPS and FFS displays, which have low threshold voltages, sufficiently broad nematic phases, preferably relatively high birefringence (Δn) together with short response times, and at the same time have high transmittance, good stability against degradation by heat and UV exposure, and a stable and high VHR. DETAILED DESCRIPTION OF THE INVENTION

[0037] This type of medium can be used in particular for electro-optical displays with active matrix addressing, for IPS or FFS displays.

[0038] The medium according to the invention preferably additionally comprises one or more compounds selected from the group of compounds of formula II and III, preferably one or more compounds of formula II, more preferably additionally one or more compounds of formula III, most preferably additionally one or more compounds selected from the group of compounds of formula IV and V, and again preferably one or more compounds selected from the group of compounds of formulae VI to IX (all formulae as defined hereinafter).

[0039] The mixtures according to the invention exhibit a very wide nematic phase range with a clearing point above 70° C., very favorable values ​​of the capacity threshold, relatively high values ​​of retention, and at the same time good low-temperature stability at −20° C. and −30° C. and very low rotational viscosity. The mixtures according to the invention are furthermore distinguished by a good ratio between clearing point and rotational viscosity and a relatively high positive dielectric anisotropy.

[0040] Surprisingly, it has been found 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 particular combination of physical properties. The most crucial of these are high values ​​of the elastic constants, in particular high k 11 , and the rotational viscosity (γ1) and elastic constant (k 11 ) with an excellent low ratio (γ1 / k 11 )

[0041] The liquid crystal medium according to the present invention preferably has a positive dielectric anisotropy in the range of 1.5 to 20.0, more preferably 2.0 to 8.0, most preferably 2.5 to 7.0.

[0042] The liquid-crystalline medium of the present invention preferably has a dielectric anisotropy (Δε) of 0.5 or more and comprises the following components:

[0043] a) One or more compounds of formula T having a high dielectric constant both perpendicular to the director and parallel to the director are contained, preferably in a concentration within the range of 1% to 60%, more preferably within the range of 5% to 40%, and particularly preferably within the range of 8% to 35%.

[0044] [ka] wherein each ring, preferably the phenylene ring, is optionally substituted by one or two alkyl groups, preferably by methyl and / or ethyl groups, preferably by one methyl group; R S1 and R S2represent, independently of one another, alkyl, alkoxy (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably having 1 to 7 C atoms, alkenyl, alkenyloxy or alkoxyalkyl, preferably alkyl or alkenyl (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), Alternatively, R S1 preferably represents a fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms or a fluorinated alkenyl having 2 to 7 C atoms, Alternatively, R S2 is X S represents X S represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4, preferably 1 or 2, C atoms), preferably F, Cl, CF3 or OCF3, more preferably F, CF3 or OCF3, most preferably CF3 or OCF3, Y S1 and Y S2 are each independently H or F, preferably one of them and most preferably both are F, However, one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl.

[0045] b) comprises one or more compounds of formula L

[0046] [ka] During the ceremony, R L1 and R L2represent, independently of one another, alkyl, alkoxy (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably having 1 to 7 C atoms, alkenyl, alkenyloxy or alkoxyalkyl, preferably alkyl or alkenyl (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), Alternatively, R L1 preferably represents a fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms or a fluorinated alkenyl having 2 to 7 C atoms, Alternatively, R L2 is X L represents X L represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4, preferably 1 or 2, C atoms), preferably F, Cl, CF3 or OCF3, more preferably F, CF3 or OCF3, most preferably CF3 or OCF3, most preferably CF3, Y L1 and Y L2 represent, independently of one another, H or F, preferably one of them and most preferably both of them represent H, However, the aromatic ring may be optionally substituted with an alkyl group, preferably methyl.

[0047] c) As an optional component, preferably as an essential component, it contains one or more compounds selected from the group consisting of compounds of formulas II and III, which are preferably dielectrically positive and each preferably have a dielectric anisotropy of 3 or more.

[0048] [ka] TIFF2025148458000008.tif50165 formula, R 2 represents alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, preferably alkyl or alkenyl, provided that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene;

[0049] [ka] L 21 and L 22 each independently represents H or F, preferably L 21 represents F, X 2 represents halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, preferably F, Cl, -OCF3, -O-CH2CF3, -O-CH=CH2, -O-CH=CF2 or -CF3, very preferably F, Cl, -O-CH=CF2 or -OCF3, m is 0, 1, 2 or 3, preferably 1 or 2, particularly preferably 1, R 3 represents alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, preferably alkyl or alkenyl, provided that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene;

[0050] [ka] L 31 and L 32 are each independently H or F, preferably L 31 represents F, X 3 is halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, and is F, Cl, -OCF3, -OCHF2, -O-CH2CF3, -O-CH=CF2, -O-CH=CH2 or -CF3, very preferably F, Cl, -O-CH=CF2, -OCHF2 or -OCF3, Z 3 represents -CH2CH2-, -CF2CF2-, -COO-, trans-CH=CH-, trans-CF=CF-, -CHO- or a single bond, preferably -CH2CH2-, -COO-, trans-CH=CH- or a single bond, very preferably -COO-, trans-CH=CH- or a single bond, n is 0, 1, 2 or 3, preferably 1, 2 or 3, particularly preferably 1, However, one or more, preferably one, of the aromatic rings may optionally be substituted by an alkyl group, preferably methyl.

[0051] d) As an optional component, preferably as an essential component, one or more preferably dielectrically neutral compounds selected from the group of compounds of formulae IV and V may be contained.

[0052] [ka] During the ceremony, R 41and R 42 are, independently of each other, R in formula II 2 has the meaning given above for R 41 represents alkyl, and R 42 represents alkyl or alkoxy, or R 41 represents alkenyl, and R 42 represents alkyl, with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene,

[0053] [ka] Z 41 and Z 42 are independent of each other, and Z 41 appear twice, they also independently represent -CH2CH2-, -COO-, trans-CH=CH-, trans-CF=CF-, -CHO-, -CF2O-, -C≡C- or a single bond, preferably one or more of them represents a single bond, p represents 0, 1 or 2, preferably 0 or 1; R 51 and R 52 are, independently of each other, R 41 and R 42 preferably alkyl having 1 to 7 C atoms, preferably n-alkyl, particularly preferably n-alkyl having 1 to 5 C atoms, or alkoxy having 1 to 7 C atoms, preferably n-alkoxy, particularly preferably n-alkoxy having 2 to 5 C atoms, or alkoxyalkyl having 2 to 7 C atoms, preferably having 2 to 4 C atoms, alkenyl or alkenyloxy, preferably alkenyloxy, with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene,

[0054] [ka] Preferably

[0055] [ka] Preferably,

[0056] [ka] And if it exists,

[0057] [ka] Z 51 ~Z 53 are each, independently of one another, -CH-CH-, -CH-O-, -CH=CH-, -C≡C-, -COO- or a single bond, preferably -CH-CH-, -CH-O- or a single bond, particularly preferably a single bond, i and j each independently represent 0 or 1; (i+j) preferably represents 0, 1 or 2, more preferably 0 or 1, most preferably 1; However, one or more, preferably one, of the aromatic rings present may optionally be substituted by an alkyl group, preferably methyl.

[0058] Throughout this application, 1,3-cyclopentenylene is a moiety selected from the group of formulae below:

[0059] [ka]

[0060] The liquid-crystalline media according to the present application preferably have a nematic phase.

[0061] The present invention also relates to the simultaneous use of compounds of formula T and L as shown above, wherein the parameters have their respective meanings, including their respective preferred meanings as shown above and below.

[0062] The compounds of formula T used in the liquid-crystalline media according to the invention are preferably selected from the group of the compounds of formulae T-1 and T-2, preferably of formula T-1.

[0063] [ka] TIFF2025148458000019.tif49165In the formula, the parameter is R in formula T-1. S2 is X S have the respective meanings given in formula T above, except that they may not represent During the ceremony, R S represents preferably alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably alkyl, alkoxy, alkenyl or alkenyloxy, most preferably alkoxy or alkenyloxy, X S represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4 C atoms), preferably F, Cl, CF3 or OCF3, more preferably CF3 or OCF3.

[0064] The compounds of formula T-1 used in the liquid-crystalline media according to the invention are preferably selected from the group of compounds of formulae T-1-1 to T-1-3, preferably from formulae T-1-2 and T-1-3, preferably from formula T-1-3.

[0065] [ka] TIFF2025148458000021.tif38166TIFF2025148458000022.tif47166wherein the parameters have the respective meanings, including the respective preferred meanings, given above.

[0066] The compounds of the formula T-2 used in the liquid-crystalline media according to the invention are preferably selected from the group of the compounds of the formulae T-2-1 to T-2-3, preferably from the formulae T-2-2 and T-2-3, preferably from the formula T-2-3.

[0067] [ka] TIFF2025148458000024.tif40166TIFF2025148458000025.tif47166wherein the parameters have the respective meanings, including the respective preferred meanings, given above.

[0068] Compounds of formula T, such as PPS-nm, PGS-nm, PUS-nm, PPS-nX, PGS-nX and PUS-nX, where X is F, CF3 or OCF3, are prepared according to known synthetic routes.

[0069] The compounds of formula L used in the liquid crystal media according to the present invention are preferably selected from the group of compounds of formulae L-1 and L-2, preferably of formula L-1, more preferably of both formulae L-1 and L-2.

[0070] [ka] TIFF2025148458000027.tif50165In the formula, the parameter is R in formula L-1. 2L is X L have the respective meanings given in formula L above, except that During the ceremony, R L represents preferably alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (with the proviso that one -CH2- group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably alkyl, alkoxy, alkenyl or alkenyloxy, most preferably alkoxy or alkenyloxy, X L is F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4 C atoms), preferably F, Cl, CF3 or OCF3, more preferably CF3 or OCF 3、 Most preferably it represents CF3. And preferably it represents R L1 is alkenyl, most preferably vinyl or 1-E-propenyl, and / or R L2 is alkyl, more preferably n-alkyl, most preferably methyl, ethyl or propyl.

[0071] The compounds of formula L-1 used in the liquid-crystalline media according to the present invention are preferably selected from the group of compounds of formulae L-1-1 to L-1-3, preferably from formulae L-1-1 and L-1-2, most preferably from formula L-1-1.

[0072] [ka] TIFF2025148458000029.tif39166TIFF2025148458000030.tif47166wherein the parameters have the respective meanings, including the respective preferred meanings, given above.

[0073] The compounds of formula L-2 used in the liquid-crystalline media according to the invention are preferably selected from the group of compounds of formulae L-2-1 to L-2-3, preferably from formulae L-2-2 and L-2-3, most preferably from formula L-2-3.

[0074] [ka] TIFF2025148458000032.tif39166TIFF2025148458000033.tif47166wherein the parameters have the respective meanings, including the respective preferred meanings, given above, and preferably R L is alkyl or alkenyl, preferably alkyl, preferably ethyl, propyl or pentyl, most preferably ethyl or propyl; Preferably In formula L-2-1, X L is OCF3 or CF3, most preferably CF3, In formula L-2-2, X L is F, OCF3 or CF3, most preferably OCF3, and In formula L-2-3, X L is F, OCF3 or CF3, most preferably F.

[0075] Compounds of formula L, such as those of formulae CLP-Vn, CLP-1V-n and CLP-nT, are prepared according to known synthetic routes.

[0076] The invention furthermore relates to liquid-crystal displays, in particular IPS or FFS displays, particularly preferably FFS or SG-FFS displays, which contain a liquid-crystalline medium according to the invention.

[0077] The present invention further relates to a liquid crystal display of the IPS or FFS type comprising a liquid crystal cell consisting of two substrates, at least one of which is transparent to light and at least one of which has an electrode layer, and a liquid crystal medium layer arranged between the substrates and comprising a polymerized component and a low molecular weight component, the polymerized component being obtainable by polymerizing one or more polymerizable compounds in the liquid crystal medium between the substrates of the liquid crystal cell, preferably under application of a voltage, and the low molecular weight component being a liquid crystal mixture according to the invention as described above and below.

[0078] The displays according to the invention are preferably addressed by active matrix (active matrix LCD, abbreviated as AMD), preferably thin-film transistor (TFT) addressing, however the liquid crystals according to the invention can also be used to advantage in displays with other known addressing methods.

[0079] The present invention further relates to a process for the preparation of a liquid-crystalline medium according to the invention by mixing one or more compounds selected from the group of compounds of the formulae T and L, preferably of the formulae T-1 and / or T-2, with one or more compounds of the formulae L-1 and / or L-2, with one or more low molecular weight liquid-crystalline compounds or liquid-crystalline mixtures and, optionally, with further liquid-crystalline compounds and / or additives.

[0080] Above and below, the following meanings apply:

[0081] The term "mesogenic group" is known to those skilled in the art and described in the literature and refers to a group that essentially contributes to the generation of a liquid crystal (LC) phase in low-molecular-weight or polymeric substances due to the anisotropy of its attractive and repulsive interactions. A compound containing a mesogenic group (mesogenic compound) does not necessarily have an LC phase by itself. It is also possible for a mesogenic compound to exhibit liquid crystal phase behavior only after mixing with other compounds and / or polymerization. Typical mesogenic groups are, for example, rigid rod- or disc-shaped units. A review of the terms and definitions used in relation to mesogens or liquid crystal compounds is given in Pure Appl. Chem., Vol. 73 (No. 5), p. 888 (2001) and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem., 2004, Vol. 116, pp. 6340-6368.

[0082] The term "spacer group" or "spacer" for short, also referred to as "Sp" above and below, is known to those skilled in the art and described in the literature, see, for example, Pure Appl. Chem., Vol. 73 (No. 5), p. 888 (2001) and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, Vol. 116, pp. 6340-6368. Unless otherwise indicated, the term "spacer group" or "spacer" above and below refers to a flexible group that connects the mesogenic group and the polymerizable group(s) to each other in a polymerizable mesogenic compound.

[0083] For the purposes of the present invention, the term "liquid crystal medium" is intended to denote a medium comprising a liquid crystal mixture and one or more polymerizable compounds, such as, for example, reactive mesogens. The term "liquid crystal mixture" (or "host mixture") is intended to denote a liquid crystal mixture consisting only of non-polymerizable low molecular weight compounds, preferably two or more liquid crystal compounds and optionally further additives, such as, for example, chiral dopants or stabilizers.

[0084] Particular preference is given to liquid-crystalline mixtures or liquid-crystalline media which have a nematic phase, especially at room temperature.

[0085] In a preferred embodiment of the present invention, the liquid-crystalline medium comprises one or more compounds selected from the group of compounds of the formulae II-1 and II-2 and / or III-1 and III-2, which preferably have a dielectrically positive, preferably dielectric anisotropy of 3 or more.

[0086] [ka] TIFF2025148458000035.tif50165 where the parameters have the respective meanings given above in Formula II, and L 23 and L 24 are each independently H or F, preferably L 23 represents F, and

[0087] [ka] In the case of formula II-1 and II-2, X 2 preferably represents F or OCF3, particularly preferably F, and in the case of formula II-2,

[0088] [ka]

[0089] [ka] TIFF2025148458000039.tif50165 where the parameters have the meanings given in Formula III.

[0090] The medium according to the invention may also comprise, instead of or in addition to the compounds of formula III-1 and / or III-2, one or more compounds of formula III-3.

[0091] [ka] where the parameters have the respective meanings given above, and the parameter L 31 and L 32 represent H or F, independently of each other and other parameters.

[0092] The liquid crystal medium is preferably L 21 and L 22 and / or L 23 and L 24 and wherein both represent F.

[0093] In a preferred embodiment the liquid crystal medium is L 21 , L 22 , L 23 and L 24 and II-1 and II-2, wherein all of the above are F.

[0094] The liquid-crystalline medium preferably comprises one or more compounds of formula II-1, which are preferably selected from the group of compounds of formulae II-1a to II-1e, preferably one or more compounds of formulae II-1a and / or II-1b and / or II-1d, preferably II-1a and / or II-1d or II-1b and / or II-1d, most preferably compounds of formula II-1d.

[0095] [ka] where the parameters have the respective meanings given above, and L 25 and L 26 represent, independently of each other and of the other parameters, H or F, preferably In formulas II-1a and II-1b, L 21 and L 22 both represent F, In formulas II-1c and II-1d, L 21 and L 22 Both represent F and / or L23 and L 24 both represent F, and In formula II-1e, L 21 , L 22 and L 25 represents F.

[0096] The liquid-crystalline medium preferably comprises one or more compounds of the formula II-2, preferably selected from the group of compounds of the formulae II-2a to II-2k, preferably one or more compounds of the formulae II-2a and / or II-2h and / or II-2j, respectively.

[0097] [ka]

[0098] [ka] where the parameters have the respective meanings given above, and L 25 ~L 28 are each independently H or F, preferably L 27 and L 28 Both of these represent H, and particularly preferably, L 26 represents H.

[0099] The liquid crystal medium is preferably L 21 and L 22 Both represent F and / or L 23 and L 24 and both represent F.

[0100] In a preferred embodiment the liquid crystal medium is L 21 , L 22 , L 23 and L 24 and wherein all of the following are F:

[0101] Particularly preferred compounds of formula II-2 are those of the following formulae, particularly preferred are compounds of formulae II-2a-1 and / or II-2h-1 and / or II-2k-2:

[0102] [ka]

[0103] [ka] In the formula, R 2 and X 2 has the meaning given above, and X 2 preferably represents F.

[0104] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1, which are preferably selected from the group of the compounds of the formulae III-1a to III-1j, preferably from the group of the compounds of the formulae III-1c, III-1f, III-1g and III-1j.

[0105] [ka]

[0106] [ka] In the formula, the parameters have the above-mentioned meanings, preferably the parameters have the above-mentioned respective meanings, and the parameter L 35 and L 36 represent H or F, independently of each other and other parameters, and the parameter L 35 and L 36 represent H or F, independently of each other and other parameters.

[0107] The liquid-crystalline medium preferably comprises one or more compounds of formula III-1c, which compounds are preferably selected from the group of compounds of formulae III-1c-1 to III-1c-5, preferably of formulae III-1c-1 and / or III-1c-2, most preferably of formula III-1c-1.

[0108] [ka] In the formula, R 3 has the meaning given above.

[0109] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1f, which compounds are preferably selected from the group of the compounds of the formulae III-1f-1 to III-1f-6, preferably of the formulae III-1f-1 and / or III-1f-2 and / or III-1f-3 and / or III-1f-6, more preferably of the formulae III-1f-3 and / or III-1f-6, more preferably of the formula III-1f-6.

[0110] [ka] In the formula, R 3 has the meaning given above.

[0111] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1g, which are preferably selected from the group of the compounds of the formulae III-1g-1 to III-1g-5, preferably of the formula III-1g-3.

[0112] [ka] In the formula, R 3 has the meaning given above.

[0113] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1h, which compounds are preferably selected from the group of the compounds of the formulae III-1h-1 to III-1h-3, preferably of the formula III-1h-3.

[0114] [ka] where the parameters have the meanings given above and X 3 preferably represents F.

[0115] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1i, which compounds are preferably selected from the group of the compounds of the formulae III-1i-1 and III-1i-2, preferably of the formula III-1i-2.

[0116] [ka] where the parameters have the meanings given above and X 3 preferably represents F.

[0117] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-1j, which compounds are preferably selected from the group of the compounds of the formulae III-1j-1 and III-1j-2, preferably of the formula III-1j-1.

[0118] [ka] where the parameters have the meanings given above.

[0119] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-2: The compounds of the formula III-2 are preferably selected from the group of the compounds of the formulae III-2a and III-2b, preferably III-2b.

[0120] [ka] where the parameters have the respective meanings given above, and the parameter L 33 and L 34 represent H or F, independently of each other and other parameters.

[0121] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-2a, which compounds are preferably selected from the group of the compounds of the formulae III-2a-1 to III-2a-6:

[0122] [ka] In the formula, R 3 has the meaning given above.

[0123] The liquid-crystalline medium preferably comprises one or more compounds of the formula III-2b, which compounds are preferably selected from the group of the compounds of the formulae III-2b-1 to III-2b-4, preferably III-2b-4

[0124] [ka] In the formula, R 3 has the meaning given above.

[0125] Alternatively or in addition to the compounds of formula III-1 and / or III-2, the medium according to the invention may also comprise one or more compounds of formula III-3.

[0126] [ka] wherein the parameters have the respective meanings given above in Formula III.

[0127] These compounds are preferably selected from the group of compounds of formulae III-3a and III-3b:

[0128] [ka] In the formula, R 3 has the meaning given above.

[0129] The liquid-crystalline media according to the invention preferably comprise one or more dielectrically neutral compounds preferably selected from the group of the compounds of the formulae VI, VII, VIII and IX, preferably having a dielectric anisotropy in the range from -1.5 to 3.

[0130] In the present application, all elements include their respective isotopes. In particular, one or more H in a compound may be replaced by D, which is also particularly preferred in some embodiments. Correspondingly, highly deuterated corresponding compounds can, for example, allow the detection and recognition of said compounds. This can be very useful in some cases, especially in the case of compounds of formula I.

[0131] In this application, Alkyl is particularly preferably straight-chain alkyl, in particular CH3-, C2H5-, n-C3H7-, n-C4H9- or n-C5H 11 - represents Alkenyl particularly preferably denotes CH2=CH-, E-CH3-CH=CH-, CH2=CH-CH2-CH2-, E-CH3-CH=CH-CH2-CH2- or E-(n-C3H7)-CH=CH-.

[0132] In a further preferred embodiment, the medium comprises one or more compounds of formula IV, preferably one or more compounds of formula IV-A.

[0133] [ka] During the ceremony, R 41 represents an unsubstituted alkyl group having 1 to 7 C atoms or an unsubstituted alkenyl group having 2 to 7 C atoms, preferably an n-alkyl group, particularly preferably an n-alkyl group having 2, 3, 4 or 5 C atoms,

[0134] R 42represents an unsubstituted alkyl group having 1 to 7 C atoms, an unsubstituted alkenyl group having 2 to 7 C atoms or an unsubstituted alkoxy group having 1 to 6 C atoms (both of which preferably have 2 to 5 C atoms), an unsubstituted alkenyl group having 2 to 7 C atoms, preferably having 2, 3 or 4 C atoms, more preferably a vinyl group or a 1-propyl group, in particular a vinyl group.

[0135] In a particularly preferred embodiment, the medium comprises one or more compounds of formula IV-A selected from the group of compounds of formulae IV-1 to IV-4, preferably formula IV-1.

[0136] [ka] TIFF2025148458000061.tif32165TIFF2025148458000062.tif32165TIFF2025148458000063.tif32165In the formula, alkyl and alkyl' independently denote alkyl having 1 to 7 C atoms, preferably having 2 to 5 C atoms, alkenyl and alkenyl' independently denote an alkenyl group having 2 to 5 C atoms, preferably having 2 to 4 C atoms, particularly preferably having 2 C atoms, alkenyl' represents an alkenyl group having 2 to 5 C atoms, preferably having 2 to 4 C atoms, particularly preferably having 2 to 3 C atoms, Alkoxy represents alkoxy having 1 to 5 C atoms, preferably having 2 to 4 C atoms.

[0137] In a particularly preferred embodiment, the medium according to the invention comprises one or more compounds of formula IV-1 and / or one or more compounds of formula IV-2.

[0138] In a further preferred embodiment, the medium comprises one or more compounds of formula V:

[0139] Preferably, the medium according to the invention comprises the following compounds in the total concentrations indicated below: 5 to 60% by weight of one or more compounds selected from the group of compounds of formula T, and 5 to 60% by weight, preferably 10 to 50% by weight, of one or more compounds selected from the group of compounds of formula L, and / or 5 to 60% by weight of one or more compounds of formula II, preferably selected from the group of compounds of formulae II-1 and II-2, and / or 5 to 25% by weight of one or more compounds of formula III, and / or 5 to 45% by weight of one or more compounds of formula IV, and / or 5 to 25% by weight of one or more compounds of formula V, However, the total content of all compounds of formulae T, L, and II to V present in the medium is preferably 95% or more, more preferably 100%.

[0140] The latter condition is preferred for all media according to the present application.

[0141] In a further preferred embodiment, the medium according to the invention comprises, in addition to the compound of formula T or a preferred sub-formula thereof, one or more preferably dielectrically neutral compounds, preferably selected from the group of the compounds of formulae IV and V, preferably in a total concentration in the range from ≧5% to ≦90%, preferably from ≧10% to ≦80%, particularly preferably from ≧20% to ≦70%.

[0142] In a particularly preferred embodiment, the medium according to the invention comprises one or more compounds of formula II in a total concentration in the range of ≧5% to ≦50%, preferably in the range of ≧10% to ≦40%.

[0143] Preferably, the concentration of the compound of formula T in the medium according to the present invention is in the range of 1% to 60%, more preferably 5% to 50%, most preferably 8% to 45%.

[0144] Preferably, the concentration of the compound of formula L in the medium according to the present invention is in the range of 1% to 60%, more preferably 5% to 40%, most preferably 8% to 35%.

[0145] In a preferred embodiment of the present invention, the concentration of the compound of formula II in the medium is in the range of 3% to 60%, more preferably 5% to 55%, more preferably 10% to 50%, and most preferably 15% to 45%.

[0146] The present invention also relates to electro-optical displays or electro-optical components containing a liquid-crystalline medium according to the invention, preferably electro-optical displays based on the VA, ECB, IPS or FFS effect, in particular those addressed by an active matrix addressing system.

[0147] The invention thus likewise relates to the use of liquid-crystalline media according to the invention in electro-optical displays or electro-optical components, and to a process for preparing liquid-crystalline media according to the invention, characterized in that one or more compounds of formula T, preferably of sub-formulae T-1 and / or T-2, are mixed with one or more compounds of formula L, preferably with one or more compounds of formulae L-1 and / or L-2, and / or with one or more compounds selected from the group of the formulae IV and V, and with one or more compounds of formulae II-1, II-2, and preferably with one or more further compounds selected from the group of the compounds of the formulae IV and V, more preferably with one or more compounds of both formulae IV and V.

[0148] In a further preferred embodiment, the medium comprises one or more compounds of formula IV selected from the group of compounds of formula IV-2 and IV-3:

[0149] [ka] TIFF2025148458000065.tif33165In formula, alkyl and alkyl' independently denote alkyl having 1 to 7 C atoms, preferably having 2 to 5 C atoms, Alkoxy represents alkoxy having 1 to 5 C atoms, preferably having 2 to 4 C atoms.

[0150] In a further preferred embodiment, the medium comprises one or more compounds of formula V selected from the group of compounds of formulae V-1 and V-2, preferably formula V-1.

[0151] [ka] TIFF2025148458000067.tif33165 in which the parameters have the meanings given above in formula V, preferably R 51 represents alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms, R 52 represents alkyl having 1 to 7 C atoms, alkenyl having 2 to 7 C atoms or alkoxy having 1 to 6 C atoms, preferably alkyl or alkenyl, particularly preferably alkyl.

[0152] In a further preferred embodiment, the medium comprises one or more compounds of formula V-1 selected from the group of compounds of formula V-1a and V-1b:

[0153] [ka] TIFF2025148458000069.tif33165In formula, alkyl and alkyl' independently denote alkyl having 1 to 7 C atoms, preferably having 2 to 5 C atoms, Alkenyl represents alkenyl having 2 to 7 C atoms, preferably having 2 to 5 C atoms.

[0154] In addition, the present invention relates to a method for reducing the wavelength dispersion of a liquid-crystalline medium comprising one or more compounds of formula II and optionally one or more compounds selected from the group of compounds of formula IV and / or one or more compounds of formula V, characterized in that one or more compounds of each of formulae T and L are used in the medium.

[0155] In addition to the compounds of formulae T, L and II-V, other constituents may also be present, for example in amounts of up to 35%, but preferably up to 25%, in particular up to 10%, of the total mixture.

[0156] The medium according to the invention may also contain dielectrically positive components, the total concentration of which is preferably not more than 20%, more preferably not more than 10%, based on the total medium.

[0157] In a preferred embodiment, the liquid-crystalline media according to the invention comprise a total amount of 1% to 50%, preferably 2% to 35%, particularly preferably 3% to 25% of a compound of formula T; 1% to 20%, preferably 2% to 15%, particularly preferably 3% to 12% of a compound of formula L; 20% to 50%, preferably 25% to 45%, particularly preferably 30% to 40%, of compounds of formula II and / or III, and ·Contains 0% or more and 35% or less, preferably 2% or more and 30% or less, particularly preferably 3% or more and 25% or less of the compound of formula IV and / or V.

[0158] The liquid crystal media according to the invention may comprise one or more chiral compounds.

[0159] Particularly preferred embodiments of the present invention satisfy one or more of the following conditions: Here, the acronyms (abbreviations) are explained in Tables A to C and exemplified in Table D.

[0160] In a preferred embodiment of the present application, compounds of formula T, which are preferred per se and are also preferably used in liquid-crystalline media, are S1 is F and Y S2 is H; or the compound of formula T is S1 and Y S2 Both are F.

[0161] Preferably, the medium according to the invention meets one or more of the following conditions:

[0162] i) The liquid-crystalline medium has a birefringence of 0.060 or more, particularly preferably 0.070 or more.

[0163] ii) The liquid-crystalline medium has a birefringence of less than or equal to 0.250, particularly preferably less than or equal to 0.220.

[0164] iii) The liquid crystal medium comprises one or more particularly preferred compounds of the formula I-4.

[0165] vi) The total concentration of compounds of formula IV in the mixture as a whole is at least 25%, preferably at least 30%, preferably in the range from 25% to 49%, particularly preferably in the range from 29% to 47%, and very particularly preferably in the range from 37% to 44%.

[0166] v) The liquid-crystalline medium comprises one or more compounds of the formula IV selected from the group of the compounds of the formulae CC-nV and / or CC-n-Vm and / or CC-VV and / or CC-V-Vn and / or CC-nV-Vn, particularly preferably compounds of CC-3-V, preferably in a concentration of up to 60%, particularly preferably up to 50%, and optionally additionally comprises CC-3-V1, preferably in a concentration of up to 15%, and / or CC-4-V, preferably in a concentration of up to 24%, particularly preferably up to 30%.

[0167] vi) The medium contains a compound of formula CC-nV, preferably CC-3-V, preferably in a concentration of 1% to 60%, more preferably 30% to 50%.

[0168] vii) The total concentration of the compounds of formula CLY-n-Om in the entire mixture is 5% or more and 40% or less, preferably 10% or more and 30% or less.

[0169] viii) The liquid-crystalline medium comprises one or more compounds of the formula IV, preferably of the formula IV-1 and / or IV-2, preferably in a total concentration of 1% or more, in particular 2% or more, very particularly preferably 3% or more and 50% or less, preferably 35% or less.

[0170] ix) The liquid-crystalline medium comprises one or more compounds of the formula V, preferably of the formula V-1 and / or V-2, in a total concentration of preferably 1% or more, in particular 2% or more, very particularly preferably 15% to 35%, preferably 30% or less.

[0171] x) The total concentration of the compound of formula CCP-Vn, preferably CCP-V-1, in the entire mixture is preferably 5% or more and 30% or less, preferably 15% or more and 25% or less.

[0172] xi) The total concentration of compounds of formula CCP-V2-n, preferably CCP-V2-1, in the entire mixture is preferably 1% to 15%, preferably 2% to 10%.

[0173] The invention further relates to an electro-optical display with active matrix addressing based on the VA, ECB, IPS, FFS or UB-FFS effect, characterized in that it contains a liquid-crystalline medium according to the invention as dielectric.

[0174] The liquid crystal mixture preferably has a nematic phase range with a temperature range of at least 70°C.

[0175] The rotational viscosity γ1 is preferably 200 mPa·s or less, more preferably 150 mPa·s or less, in particular 120 mPa·s or less.

[0176] The mixtures according to the invention are suitable for all IPS and FFS-TFT applications which use dielectrically positive liquid-crystalline media.

[0177] The liquid-crystalline media according to the invention preferably consist essentially entirely of 4 to 18, in particular 5 to 15 and particularly preferably not more than 12 compounds, which are preferably selected from the group of the compounds of the formulae T, L, II, III, IV and V.

[0178] The liquid crystal media according to the invention may also contain more than 18 compounds, in which case the media preferably contain from 18 to 25 compounds.

[0179] In a preferred embodiment, the liquid crystal media according to the invention consist predominantly, preferably consist essentially and most preferably consist substantially completely of compounds which do not contain cyano groups.

[0180] In a preferred embodiment, the liquid-crystalline medium according to the invention comprises a compound selected from the group of compounds of the formulae T, L, II and III, IV and V, preferably selected from the group of compounds of the formulae T (preferably selected from T-1 and T-2), formula L (preferably selected from L-1 and L-2), formula II (preferably selected from II-1 and II-2), formula III (preferably selected from III-1 and III-2), formula IV and formula V. The medium preferably consists predominantly, particularly preferably consists essentially and very particularly preferably consists substantially completely of compounds of the formulae.

[0181] The liquid-crystalline media according to the present invention preferably have a nematic phase in each case at least from -10°C to 70°C, particularly preferably from -20°C to 80°C, very particularly preferably from -30°C to 85°C, and most preferably from -40°C to 90°C.

[0182] In this document, the expression "having a nematic phase" means, on the one hand, that no smectic phase or crystallization is observed at low temperatures at the corresponding temperatures, and, on the other hand, that heating from the nematic phase does not result in clearing. Low-temperature studies are carried out in a flow viscometer at the corresponding temperatures and are confirmed by storage for at least 100 hours in test cells with a layer thickness corresponding to the electro-optical application. A medium is considered stable at this temperature if its storage stability at a temperature of -20°C in the corresponding test cell is 1000 hours or more. At temperatures of -30°C and -40°C, the corresponding times are 500 hours and 250 hours, respectively. At higher temperatures, the clearing point is measured conventionally in capillary tubes.

[0183] The liquid crystal media according to the invention preferably have a relatively low threshold voltage (V0) in the range of ≥1.0V to ≤2.7V, preferably ≥1.2V to ≤2.5V, particularly preferably ≥1.3V to ≤2.2V.

[0184] In addition, the liquid-crystalline media according to the invention have high values ​​of VHR in a liquid-crystal cell.

[0185] In freshly filled cells at 20°C, these VHR values ​​are greater than or equal to 95%, preferably greater than or equal to 97%, particularly preferably greater than or equal to 98%, very particularly preferably greater than or equal to 99%, and after 5 minutes in an oven in a cell at 100°C, the VHR is greater than or equal to 90%, preferably greater than or equal to 93%, particularly preferably greater than or equal to 96%, very particularly preferably greater than or equal to 98%.

[0186] Here, in general, liquid-crystalline media with low addressing voltages or threshold voltages have a lower VHR than liquid-crystalline media with high addressing voltages or threshold voltages and vice versa. These preferred values ​​of the individual physical properties are preferably in each case maintained in combination with one another by the media according to the invention.

[0187] In this application, the term "compound" is also referred to as "compound(s)" and refers to both a compound and multiple compounds, unless otherwise specified.

[0188] In a preferred embodiment, the liquid-crystalline medium according to the invention has one or more compounds of formula T-1, and one or more compounds of formula T-2, and / or one or more compounds of the formulae L-1 and / or L-2, preferably one or more compounds of the formulae L-1 and L-2, and / or one or more compounds of formula II, preferably selected from the group of formulae PUQU-nF, CDUQU-nF, APUQU-nF and PGUQU-nF, and / or one or more compounds of formula III, preferably selected from the group of formulae CCP-n-OT, CLP-nT, CGG-nF and CGG-n-OD, and / or one or more compounds of formula IV, preferably selected from the group of formulae CC-nV, CC-n-Vm, CC-nm and CC-VV, and / or one or more compounds of formula V, preferably selected from the group of formulae CCP-nm, CCP-Vn, CCP-V2-n, CLP-Vn, CCVC-nV and CGP-nm, and / or optionally, and preferably essentially, one or more compounds of the formula IV, preferably selected from the group of the compounds of the formulae CC-nV, CC-n-Vm and CC-nV-Vm, preferably selected from the group of the compounds CC-3-V, CC-3-V1, CC-4-V, CC-5-V and CC-VV, particularly preferably selected from the group of the compounds CC-3-V, CC-3-V1, CC-4-V and CC-VV, very particularly preferably the compound CC-3-V, and optionally additionally compounds of the formulae CC-4-V and / or CC-3-V1 and / or CC-VV, and / or Optionally, but preferably essentially, one or more compounds of formula V, preferably of formula CCP-V-1 and / or CCP-V2-1 Includes.

[0189] For purposes of the present invention, unless otherwise indicated in particular cases, the following definitions apply in connection with the identification of the components of the compositions.

[0190] "Contains": the concentration of the component of interest in the composition is preferably 5% or more, particularly preferably 10% or more, very particularly preferably 20% or more, "consists predominantly of": the concentration of the component of interest in the composition is preferably 50% or more, particularly preferably 55% or more, very particularly preferably 60% or more; "consists essentially of": the concentration of the component of interest in the composition is preferably 80% or more, particularly preferably 90% or more, very particularly preferably 95% or more, and "Consists essentially completely of": The concentration of the component of interest in the composition is preferably 98% or more, particularly preferably 99% or more, very particularly preferably 100.0%.

[0191] The above definitions apply both to the medium as a composition with the components of the composition, which may be components and compounds, and also to the component with the components, compounds. As far as the concentration of the individual compounds relative to the medium as a whole is concerned, the term "comprises" means that the concentration of the compound in question is preferably 1% or more, particularly preferably 2% or more, very particularly preferably 4% or more. In the present invention, "≦" means less than or equal to, preferably less than, and "≧" means greater than or equal to, preferably greater than.

[0192] In the present invention,

[0193] [ka] represents trans-1,4-cyclohexylene,

[0194] [ka] represents 1,4-cyclohexylene, preferably trans-1,4-cyclohexylene,

[0195] [ka] represents 1,4-phenylene.

[0196] In the present invention, the expression "dielectrically positive compound" means a compound with Δε > 1.5, the expression "dielectrically neutral compound" generally means a compound with -1.5 ≦ Δε ≦ 1.5, and the expression "dielectrically negative compound" means a compound with Δε < -1.5. In this specification, the dielectric anisotropy of a compound is determined by dissolving 10% by weight of the compound in a liquid crystal host and determining the capacitance of the resulting mixture at a temperature of 20 °C and a frequency of 1 kHz in at least one test cell with a cell thickness of 20 μm, homeotropic surface alignment, and homogeneous surface alignment, respectively. The measurement voltage is typically 1.0 V, but is always lower than the capacitance threshold of each liquid crystal mixture under consideration.

[0197] The host mixture used for the dielectrically positive and dielectrically neutral compounds is ZLI-4792, and the host mixture used for the dielectrically negative compounds is ZLI-2857, both manufactured by Merck, Germany. The value for each compound studied is obtained from the change in the dielectric constant of the host mixture after adding the compound studied and is extrapolated to 100% for the compound used. The compound studied is dissolved in the host mixture in an amount of 10%. If the solubility of the substance is too low for this purpose, the concentration is halved in steps until the study can be carried out at the desired temperature.

[0198] If necessary, the liquid-crystalline medium according to the present invention may also contain further additives, such as stabilizers and / or pleochroic, e.g., dichroic dyes and / or chiral dopants, in the usual amounts. The amount of these additives used is preferably a total amount of 0% to 10%, particularly preferably 0.1% to 6%, based on the total amount of the mixture. The concentration of each compound used is preferably 0.1% to 3%. The concentrations of these and similar additives are generally not taken into account when specifying the concentration and concentration range of the liquid-crystalline compound in the liquid-crystalline medium.

[0199] In a preferred embodiment, the liquid-crystalline medium according to the present invention comprises a polymer precursor, which in turn comprises one or more reactive compounds, preferably reactive mesogens, and optionally further additives, such as polymerization initiators and / or polymerization retarders, in the usual amounts. The total amount of these additives used is from 0% to 10%, particularly preferably from 0.1% to 2%, based on the total amount of the mixture. The concentrations of these and similar additives are generally not taken into account when specifying the concentration and concentration range of the liquid-crystalline compounds in the liquid-crystalline medium.

[0200] The composition comprises a number of compounds, preferably from 3 to 30, particularly preferably from 6 to 20, and very particularly preferably from 10 to 16, which are mixed in a conventional manner. Generally, the desired amount of the component used in the smaller amount is dissolved in the component that constitutes the main component of the mixture. This can be effectively achieved by raising the temperature. Observing the completion of the dissolution process is particularly easy if the selected temperature is above the clearing point of the main component. However, it is also possible to prepare liquid crystal mixtures in other conventional ways, for example, using premixes or from so-called "multi-bottle systems."

[0201] The mixtures according to the invention exhibit a very wide nematic phase range with a clearing point above 65° C., very favorable values ​​of the capacitance threshold and relatively high values ​​of the voltage holding ratio (VHR), and at the same time very good low-temperature stability at −30° C. and −40° C. Furthermore, the mixtures according to the invention are distinguished by a low rotational viscosity γ1.

[0202] It goes without saying for those skilled in the art that media according to the invention for use in VA, IPS, FFS or PALC displays may also comprise compounds in which, for example, H, N, O, Cl or F is replaced by the corresponding isotopes.

[0203] The structure of the liquid crystal display according to the invention corresponds to a conventional configuration, for example as described in EP-A-0 240 379.

[0204] With suitable additives, the liquid crystal phase according to the invention can be modified for use in any type of display disclosed to date, for example IPS and FFS LCD displays.

[0205] Table E below lists possible dopants that can be added to the mixtures according to the invention. When the mixture contains one or more dopants, the dopants are used in an amount of 0.01% to 4%, preferably 0.1% to 1.0%.

[0206] Stabilisers which may be added to the mixtures according to the invention, preferably in amounts of 0.01% to 6%, in particular 0.1% to 3%, are given in Table F below.

[0207] For the purposes of the present invention, all concentrations are given in % by weight unless expressly stated otherwise and relate to the corresponding mixture as a whole or to each mixture component (also as a whole) unless expressly stated otherwise. In this context, the term "mixture" describes a liquid-crystalline medium.

[0208] Unless otherwise expressly indicated, all temperature values ​​given herein, such as melting points T(C,N), smectic (S) to nematic (N) phase transitions T(S,N) and clearing points T(N,I), are given in degrees Celsius (°C), and correspondingly all temperature differences are given in degrees difference (° or degrees). Unless expressly indicated otherwise in the present invention, the term "threshold voltage" relates to the capacitive threshold (V0), also known as the Freederickss threshold.

[0209] Unless otherwise expressly indicated in each case, all physical properties are determined according to "Merck Liquid Crystals, Physical Properties of Liquid Crystals", November 1997, Merck KGaA, Germany, applying a temperature of 20°C, Δn is determined at 436 nm, 589 nm and 633 nm, and Δε is determined at 1 kHz.

[0210] The electro-optical properties, such as the threshold voltage (V), a capacitance measurement, as well as the switching behavior, were determined in a test cell manufactured by Merck Japan. The test cell had a soda-lime glass substrate and a polyimide alignment layer (SE-1211 and diluent). ** The liquid crystals were constructed in an ECB or VA configuration with a 1:1 ratio of 26 (both manufactured by Nissan Chemical Industries, Ltd., Japan). The alignment layers were rubbed perpendicular to each other, resulting in a homeotropic alignment of the liquid crystals. The surface area of ​​the transmission was 1 cm, with a substantially square ITO electrode. 2 is. Unless otherwise stated, no chiral dopants are added to the liquid crystal mixtures used, but the liquid crystal mixtures used according to the invention are also suitable for applications where this type of doping is required.

[0211] The rotational viscosity is determined using a rotating permanent magnet method, and the flow viscosity is determined in a modified Ubbelohde viscometer. The liquid crystal mixtures ZLI-2293, ZLI-4792, and MLC-6608, all products of Merck KGaA, Darmstadt, Germany, have rotational viscosity values ​​determined at 20 °C of 161 mPa·s, 133 mPa·s, and 186 mPa·s, respectively, and flow viscosity (ν) of 21 mmHg.2 ·s -1 , 14mm 2 ·s -1 and 27mm 2 ·s -1 is.

[0212] For practical purposes, the refractive index dispersion of a material is conventionally characterized as follows, and will be used throughout this application unless otherwise stated. Birefringence values ​​are determined at a temperature of 20°C and several fixed wavelengths using a modified Abbe refractometer with a homeotropically aligned surface on the side of the prism in contact with the material. Birefringence values ​​are determined at specific wavelengths of 436 nm (each selected spectral line of a low-pressure mercury lamp), 589 nm (the sodium D line), and 633 nm (the wavelength of a HE-Ne laser) using an attenuator / diffuser combination to prevent eye damage to the observer. In the table below, Δn is given at 589 nm, and Δ(Δn) is given as Δ(Δn) = Δn(436 nm) - Δn(633 nm).

[0213] Unless otherwise clearly indicated, the following symbols are used: V Capacitive threshold voltage at 20℃ [V] n e Anomalous refractive index measured at 20°C and 589nm Normal refractive index measured at 020°C and 589nm Δn is the optical anisotropy measured at 20°C and 589 nm λ Wavelength λ [nm] Δn(λ) Optical anisotropy measured at 20°C and wavelength λ Δ(Δn) is the change in optical anisotropy defined as follows: Δn(20℃, 436nm)-Δn(20℃, 633nm) Δ(Δn * ) "Relative change in optical anisotropy" defined as follows: Δ(Δn) / Δn(20℃, 589nm) ε ⊥ Permittivity perpendicular to the director at 20°C and 1kHz ε ∥Dielectric constant parallel to the director at 20°C and 1kHz Δε Dielectric anisotropy at 20°C and 1 kHz (Δε = ε ∥ -ε ⊥ ) ε av. Average dielectric constant (ε) at 20°C and 1kHz av. =1 / 3[ε ∥ +2ε ⊥ ]) T(N,I) or cl.p. Clearing point [℃] ν Flow viscosity measured at 20℃ [mm 2 ·s -1 ] γRotational viscosity measured at 120℃ [mPa·s] k 11 Elastic constant for "splay" deformation at 20°C [pN] k 22 Elastic constant for "twist" deformation at 20°C [pN] k 33 Elastic constant for "bend" deformation at 20°C [pN] Low temperature stability of phases determined in LTS test cells VHR voltage holding ratio ΔVHR Decrease in voltage holding ratio S rel VHR specific stability

[0214] The following examples are intended to illustrate the present invention without limiting it. However, the following examples will provide those skilled in the art with the preferred compounds to be used, their respective concentrations and their combinations with each other, as well as preferred mixing concepts. In addition, the following examples illustrate the feasible properties and property combinations.

[0215] In the present invention and particularly in the following examples, the structures of the liquid crystal compounds are represented by acronyms, and are converted to chemical formulas according to Tables A to C below. n H 2n+1 , C m H 2m+1 and C l H 2l+1 or Cn H 2n , C m H 2m and C l H 2l are linear alkyl or alkenyl groups with carbon numbers n, m and l in each case. Preferably, n, m and l are each, independently of one another, 1, 2, 3, 4, 5, 6 or 7. Table A shows the codes for the ring elements of the core structure of the compounds, Table B lists the bridging units, and Table C lists the meaning of the symbols for the left and right terminal groups of the molecule. The initial letter consists of the code for the ring element with any connecting group, followed by a first hyphen and the code for the left terminal group, and a second hyphen and the code for the right terminal group. Table D shows examples of structural descriptions of compounds with their respective abbreviations.

[0216] <Table A: Ring elements>

[0217] [Table 1]

[0218] [Table 2]

[0219] <Table B: Crosslinking Units>

[0220] [Table 3]

[0221] <Table C: Terminal group>

[0222] [Table 4] where n and m each represent an integer and the three dots "..." are spaces for other abbreviations from the table.

[0223] In addition to the compounds of formulae T and L, the mixtures according to the invention preferably contain one or more of the compounds mentioned below.

[0224] The following abbreviations are used: (n, m, and l are each independently an integer, preferably 1 to 6, and l can be 0, preferably 0 or 2.)

[0225] Exemplary and preferably used compounds of formula T

[0226] [Table 5] TIFF2025148458000078.tif48165TIFF2025148458000079.tif37165TIFF2025148458000080.tif42165TIFF2025148458000081.tif48165

[0227] [Table 6] TIFF2025148458000083.tif49165TIFF2025148458000084.tif49165TIFF2025148458000085.tif47165TIFF2025148458000086.tif43165

[0228] Additional compounds containing a thiophene ring

[0229] [Table 7] TIFF2025148458000088.tif37165TIFF2025148458000089.tif37165TIFF2025148458 000090.tif42165TIFF2025148458000091.tif42165TIFF2025148458000092.tif48165

[0230] [Table 8]

[0231] Exemplary and preferably used compounds of formula L

[0232] [Table 9] TIFF2025148458000095.tif36165

[0233] Further compounds

[0234] [Table 10] TIFF2025148458000097.tif42165

[0235] [Table 11] TIFF2025148458000099.tif42165TIFF2025148458000100.tif42165TIFF2025148458000101.tif42165TIFF2025148458000102.tif42165

[0236] [Table 12] TIFF2025148458000104.tif42165TIFF2025148458000105.tif42165

[0237] Exemplary Preferred High ε ⊥ The compound of formula IS-02 has the formula:

[0238] [Table 13] TIFF2025148458000107.tif42165

[0239] [Table 14] TIFF2025148458000109.tif42165TIFF2025148458000110.tif42165TIFF2025148458 000111.tif42165TIFF2025148458000112.tif40165TIFF2025148458000113.tif40165

[0240] [Table 15] TIFF2025148458000115.tif40165TIFF2025148458000116.tif40165TIFF2025148458 000117.tif40165TIFF2025148458000118.tif40165TIFF2025148458000119.tif40165

[0241] [Table 16] Also,

[0242] [Table 17] TIFF2025148458000122.tif42165TIFF2025148458000123.tif42165TIFF2025148458000124.tif42165

[0243] [Table 18] TIFF2025148458000126.tif42165TIFF2025148458000127.tif42165TIFF2025148458000128.tif42165TIFF2025148458000129.tif42165

[0244] Exemplary Preferred Dielectrically Positive Compounds

[0245] [Table 19] TIFF2025148458000131.tif36165TIFF2025148458000132.tif39165TIFF2025148458 000133.tif39165TIFF2025148458000134.tif36165TIFF2025148458000135.tif39165

[0246] [Table 20] TIFF2025148458000137.tif39165TIFF2025148458000138.tif39165TIFF2025148458 000139.tif45165TIFF2025148458000140.tif36165TIFF2025148458000141.tif39165

[0247] [Table 21] TIFF2025148458000143.tif68165TIFF2025148458000144.tif45165TIFF2025148458000145.tif45165TIFF2025148458000146.tif40165

[0248] [Table 22] TIFF2025148458000148.tif42152TIFF2025148458000149.tif42152TIFF2025148458 000150.tif36152TIFF2025148458000151.tif36152TIFF2025148458000152.tif36152

[0249] [Table 23] TIFF2025148458000154.tif45165TIFF2025148458000155.tif45165TIFF2025148458000156.tif45165TIFF2025148458000157.tif45165

[0250] [Table 24] TIFF2025148458000159.tif45165TIFF2025148458000160.tif45165TIFF2025148458000161.tif65165TIFF2025148458000162.tif39165

[0251] [Table 25] TIFF2025148458000164.tif45165TIFF2025148458000165.tif45165TIFF2025148458000166.tif45165TIFF2025148458000167.tif45165

[0252] [Table 26] TIFF2025148458000169.tif144165TIFF2025148458000170.tif45165

[0253] [Table 27] TIFF2025148458000172.tif45165TIFF2025148458000173.tif75165

[0254] Exemplary Preferred Dielectrically Neutral Compounds

[0255] [Table 28]

[0256] [Table 29]

[0257] [Table 30]

[0258] [Table 31]

[0259] [Table 32]

[0260] [Table 33]

[0261] Table E shows chiral dopants that are preferably used in the mixtures according to the invention.

[0262]

[0263] [Table 34]

[0264] [Table 35]

[0265] [Table 36]

[0266] In a preferred embodiment of the invention, the medium according to the invention comprises one or more compounds selected from the group of compounds of Table E.

[0267] Table F lists stabilizers that can be preferably used in the mixtures according to the invention in addition to the compounds of formula I, where the parameter n represents an integer ranging from 1 to 12. In particular, the phenol derivatives shown below act as antioxidants and can therefore be used as additional stabilizers.

[0268]

[0269] [Table 37]

[0270] [Table 38]

[0271] [Table 39]

[0272] [Table 40]

[0273] [Table 41]

[0274] [Table 42]

[0275] In a preferred embodiment of the invention, the medium according to the invention comprises one or more compounds selected from the group of compounds of Table F, in particular one or more compounds selected from the group of compounds of the following formulae:

[0276] [ka] [Example]

[0277] The following examples illustrate the present invention without limiting it in any way. However, the physical properties clarify for those skilled in the art the properties that can be achieved and the extent to which they can be modified. Thus, the combinations of various properties that can be particularly preferably achieved are well defined for those skilled in the art.

[0278] <Compound examples> Compounds of formula T are, for example:

[0279] [ka] This compound (PGS-3-T) has a melting point of 61°C, a clearing point of 172°C, and a K 61°C S B It has a phase change of 98°C N 172°C I and a Δε of +13.7.

[0280] [ka] This compound (PUS-3-T) has a melting point of 67° C., a clearing point of 102° C., a phase change of K 67° C. N 102° C. I, and a Δε of +17.4.

[0281] [ka] This compound (PUS-3-F) has a melting point of 67°C, a clearing point of 102°C, a phase change of K 67°C Sa 76°C N 102°C I, and a Δε of +10.6.

[0282] Similarly, the following compound of formula T-2-2 is prepared:

[0283] [ka]

[0284] [Table 43]

[0285] Similarly, the following compounds of formula T-2-3 are prepared:

[0286] [ka]

[0287] [Table 44]

[0288] Further compound examples

[0289] [ka] (PGS-c3-T)

[0290] [ka] (PGS-1c3-T)

[0291] [ka] (PGS)-c3.1-T)

[0292] TIFF2025148458000200.tif29158(PGS-c5(en)-T)

[0293] TIFF2025148458000201.tif34152(PGS-c5-T)

[0294] [ka] (PUS-c3-T)

[0295] [ka] (PUS-1c3-T)

[0296] <Mixture example> The following are exemplary mixtures disclosed:

[0297] <Example 1> The following mixture (M-1) is prepared and studied.

[0298] [Table 45] This mixture, mixture M-1, has a low switching parameter γ1 / k of 3.11 mPa·s / pN. 11 (20°C).

[0299] <Example 2> The following mixture (M-2) is prepared and studied.

[0300] [Table 46] This mixture, mixture M-2, exhibits a short response time.

[0301] <Example 3> The following mixture (M-3) is prepared and studied.

[0302] [Table 47] This mixture, mixture M-3, exhibits a short response time.

[0303] <Example 4> The following mixture (M-4) is prepared and studied.

[0304] [Table 48] This mixture, mixture M-4, exhibits a short response time.

[0305] <Example 5> The following mixture (M-5) is prepared and studied.

[0306] [Table 49] This mixture, Mixture M-5, exhibits a short response time.

[0307] <Example 6> The following mixture (M-6) is prepared and studied.

[0308] [Table 50] This mixture, mixture M-6, exhibits a short response time.

[0309] <Example 7> The following mixture (M-7) is prepared and studied.

[0310] [Table 51] This mixture, mixture M-7, exhibits a short response time.

[0311] <Example 8> The following mixture (M-8) is prepared and studied.

[0312] [Table 52] This mixture, M-8, is characterized by the same good properties as the previous example.

[0313] <Example 9> The following mixture (M-9) is prepared and studied.

[0314] [Table 53] This mixture, M-9, is characterized by the same good properties as the previous example.

[0315] <Example 10> The following mixture (M-10) is prepared and studied:

[0316] [Table 54] This mixture, M-10, is characterized by the same good properties as the previous example.

[0317] <Example 11> The following mixture (M-11) is prepared and studied.

[0318] [Table 55] This mixture, M-11, is characterized by the same good properties as the previous example.

[0319] <Example 12> The following mixture (M-12) is prepared and studied.

[0320] [Table 56] This mixture, M-12, is characterized by the same good properties as the previous example.

[0321] <Example 13> The following mixture (M-13) is prepared and studied.

[0322] [Table 57] This mixture, M-13, is characterized by the same good properties as the previous example.

[0323] <Example 14> The following mixture (M-14) is prepared and studied.

[0324] [Table 58] This mixture, M-14, is characterized by the same good properties as the previous example.

[0325] <Example 15> The following mixture (M-15) is prepared and studied:

[0326] [Table 59] This mixture, M-15, is characterized by the same good properties as the previous example.

[0327] <Example 16> The following mixture (M-16) is prepared and studied.

[0328] [Table 60] This mixture, M-16, is characterized by the same good properties as the previous example.

[0329] <Example 17> The following mixture (M-17) is prepared and studied:

[0330] [Table 61] This mixture, M-17, is characterized by the same good properties as the previous example.

[0331] <Example 18> The following mixture (M-18) is prepared and studied:

[0332] [Table 62] This mixture, M-18, is characterized by the same good properties as the previous example.

[0333] <Example 19> The following mixture (M-19) is prepared and studied:

[0334] [Table 63] This mixture, mixture M-19, is characterized by a rather short response time and exhibits a high clearing point.

[0335] <Example 20> The following mixture (M-20) is prepared and studied:

[0336] [Table 64] This mixture, M-20, is characterized by the same good properties as the previous example.

[0337] <Example 21> 500 ppm of a compound of the formula:

[0338] [ka] (where the two O atoms bonded to the N atom represent radicals) is added to the mixture M-20 from the previous example. Consider the resulting mixture, mixture M-21. This mixture exhibits good stability to exposure to light irradiation while maintaining other physical properties.

[0339] <Example 22> The following mixture (M-22) is prepared and studied:

[0340] [Table 65] This mixture, M-22, is characterized by the same good properties as the previous example.

[0341] <Example 23> The following mixture (M-23) is prepared and studied:

[0342] [Table 66] This mixture, M-23, is characterized by good properties like the previous example, with a high elastic constant (i.e., k 11) is shown.

[0343] <Example 24> The following mixture (M-24) is prepared and studied:

[0344] [Table 67] This mixture, M-24, is characterized by good properties like the previous example, with a high elastic constant (i.e., k 11 ) is shown.

[0345] <Example 25> The following mixture (M-25) is prepared and studied:

[0346] [Table 68] This mixture, M-25, is characterized by the same good properties as the previous example.

[0347] <Example 26> The following mixture (M-26) is prepared and studied:

[0348] [Table 69] This mixture, M-26, is characterized by the same good properties as the previous example.

[0349] <Example 27> The following mixture (M-27) is prepared and studied:

[0350] [Table 70] This mixture, M-27, is characterized by good properties like the previous example, with a high elastic constant (i.e., k 11 ) indicates.

[0351] <Example 28> The following mixture (M-28) is prepared and studied:

[0352] [Table 71] This mixture, M-28, is characterized by the same good properties as the previous example.

[0353] <Example 29> The following mixture (M-29) is prepared and studied:

[0354] [Table 72] This mixture, M-29, is characterized by the same good properties as the previous example.

[0355] <Example 30> The following mixture (M-30) is prepared and studied:

[0356] [Table 73] This mixture, M-30, is characterized by the same good properties as the previous example.

[0357] <Example 31> The following mixture (M-31) is prepared and studied:

[0358] [Table 74] This mixture, M-31, is characterized by the same good properties as the previous example.

[0359] <Example 32> The following mixture (M-32) is prepared and studied:

[0360] [Table 75] This mixture, M-32, is characterized by the same good properties as the previous example.

[0361] <Example 33>

[0362] The following mixture (M-33) is prepared and studied:

[0363] [Table 76] This mixture, M-33, is characterized by the same good properties as the previous example.

[0364] <Example 34> The following mixture (M-34) is prepared and studied:

[0365] [Table 77] This mixture, M-34, is characterized by the same good properties as the previous example.

[0366] <Example 35> The following mixture (M-35) is prepared and studied:

[0367] [Table 78] This mixture, M-35, is characterized by the same good properties as the previous example.

[0368] <Example 36> The following mixture (M-36) is prepared and studied:

[0369] [Table 79] This mixture, M-36, is characterized by the same good properties as the previous example.

[0370] <Example 37> The following mixture (M-37) is prepared and studied:

[0371] [Table 80] This mixture, M-37, is characterized by the same good properties as the previous example.

[0372] <Example 38> The following mixture (M-38) is prepared and studied:

[0373] [Table 81] This mixture, M-38, is characterized by the same good properties as the previous example.

[0374] <Example 39> The following mixture (M-39) is prepared and studied:

[0375] [Table 82] This mixture, M-39, is characterized by the same good properties as the previous example.

[0376] <Example 40> The following mixture (M-40) is prepared and studied:

[0377] [Table 83] This mixture, M-40, is characterized by the same good properties as the previous example.

[0378] <Example 41> The following mixture (M-41) is prepared and studied:

[0379] [Table 84] This mixture, M-41, is characterized by the same good properties as the previous example.

[0380] <Example 42> The following mixture (M-42) is prepared and studied:

[0381] [Table 85] This mixture, M-42, is characterized by good properties like the previous examples.

[0382] <Example 43> The following mixture (M-43) is prepared and studied:

[0383] [Table 86] This mixture, M-43, is characterized by good properties like the previous examples.

Claims

1. one or more compounds of formula T, and one or more compounds of formula L A liquid crystal medium comprising: 【Chemical 1】 (In the formula, R Ｓ１ and R Ｓ２ is preferably alkyl, alkoxy (with the proviso that one —CH ２ - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably by cyclopropylene or 1,3-cyclopentylene), or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, preferably alkyl or alkenyl (provided that one -CH ２ The - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably by cyclopropylene or 1,3-cyclopentylene, Or, R Ｓ１ preferably represents a fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms or a fluorinated alkenyl having 2 to 7 C atoms, Or, R Ｓ２ is X Ｓ represents X Ｓ is F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4, preferably 1 or 2, C atoms), preferably F, Cl, CF ３ or OCF ３ , more preferably F, CF ３ or OCF ３ , most preferably CF ３ or OCF ３ represents Y Ｓ１ and Y Ｓ２ are each independently H or F, preferably one of them and most preferably both of them are F, However, one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl. 【Chemistry 2】 (In the formula, R Ｌ１ and R Ｌ２ are, independently of one another, preferably alkyl, alkoxy (with the proviso that there is one —CH ２ The - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene.), alkenyl, or alkenyloxy, alkoxyalkyl, preferably alkyl or alkenyl (provided that one -CH ２ The - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene, Or, R Ｌ１ preferably represents a fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms or a fluorinated alkenyl having 2 to 7 C atoms, Or, R Ｌ２ is X Ｌ represents X Ｌ is F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4, preferably 1 or 2, C atoms), preferably F, Cl, CF ３ or OCF ３ , more preferably F, CF ３ or OCF ３ , more preferably CF ３ or OCF ３ , most preferably CF ３ represents Y Ｌ１ and Y Ｌ２ represent, independently of one another, H or F, preferably one of them and most preferably both of them represent H, However, the aromatic ring may be optionally substituted with an alkyl group, preferably methyl.

2. 2. The medium according to claim 1, characterized in that it comprises one or more compounds of formula T selected from the group of compounds of formula T-1 and T-2: 【Chemistry 3】 【change】 (wherein the parameters are R in formula T-1) Ｓ２ is X Ｓ have the respective meanings given in formula T above, except that During the ceremony, R Ｓ is preferably an alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (provided that one —CH ２ - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (provided that one -CH ２ - may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably alkyl, alkoxy, alkenyl or alkenyloxy, most preferably alkoxy or alkenyloxy; X Ｓ is F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4 C atoms), preferably F, Cl, CF ３ or OCF ３ , more preferably CF ３ or OCF ３ represents However, one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl.

3. 3. The medium according to claim 2, characterized in that it comprises one or more compounds of formula T-1.

4. 4. The medium according to claim 1, wherein the medium comprises one or more compounds of formula L selected from the group of compounds of formula L-1 and L-2: 【Chemistry 4】 【change】 (wherein the parameters are R in formula L-1) Ｌ２ is X Ｌ In claim 1, they have the respective meanings given in formula L, except that they may not represent R Ｌ is preferably an alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (provided that one —CH ２ - group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (provided that one -CH ２ - may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably cyclopropylene or 1,3-cyclopentylene), preferably alkyl, alkoxy, alkenyl or alkenyloxy, most preferably alkoxy or alkenyloxy; X Ｌ is F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the last four groups preferably have 1 to 4 C atoms), preferably F, Cl, CF ３ or OCF ３ , more preferably CF ３ or OCF ３、 Most preferably CF ３ represents However, one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl.

5. 5. The medium according to claim 4, characterized in that it comprises one or more compounds of formula L-2.

6. 6. Medium according to claim 4 or 5, characterized in that it comprises one or more compounds of formula L-1.

7. A medium according to any one of claims 1 to 6, characterized in that it comprises one or more compounds selected from the group of compounds of formulae II and III: 【Chemistry 5】 【change】 (In the formula, R ２ represents alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, 【Chemistry 6】 L ２１ and L ２２ represents H or F, X ２ represents halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms, or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, m represents 0, 1, 2, 3 or 3; R ３ represents alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, 【Chemistry 7】 L ３１ and L ３２ represent, independently of one another, H or F, X ３ is a halogen, a halogenated alkyl or alkoxy having 1 to 3 C atoms, or a halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, F, Cl, —OCF ３ , -OCHF ２ , —O—CH ２ CF ３ , —O—CH═CF ２ , —O—CH═CH ２ or -CF ３ represents Z ３ is -CH ２ CH ２ -, -CF ２ CF ２ -, -COO-, trans-CH=CH-, trans-CF=CF, CH ２ represents O— or a single bond, n represents 0, 1, 2 or 3; provided that one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl; However, compounds of formula L are excluded from formula III.

8. 8. Liquid-crystalline medium according to claim 1, characterized in that it comprises one or more compounds selected from the group of the formulae IV and V 【Chemistry 8】 (In the formula, R ４１ and R ４２ are independently of each other in claim 4 R in formula II ２ and 【Chemistry 9】 Z ４１ and Z ４２ are independent of each other, and Z ４１ occurs twice, they also independently represent -CH ２ CH ２ -, -COO-, trans-CH=CH-, trans-CF=CF-, -CH ２ O-, -CF ２ represents O—, —C≡C— or a single bond; p represents 0, 1 or 2; R ５１ and R ５２ are independently of each other in claim 4 ４１ and R ４２ has one of the meanings given to 【Chemistry 10】 Z ５１ ~Z ５３ are each independently —CH ２ -CH ２ -, -CH ２ represents —O—, —CH═CH—, —C≡C—, —COO— or a single bond; i and j each independently represent 0 or 1; provided that one or more, preferably one, of the aromatic rings may be optionally substituted with an alkyl group, preferably methyl, with the proviso that compounds of formula L are excluded from formula IV.

9. 9. Medium according to claim 8, characterized in that the total concentration of compounds of formula T in the whole medium is ≧3% and ≦60%, preferably ≦5-40%.

10. 10. The medium according to claim 1, further comprising one or more chiral compounds.

11. Electro-optical displays or electro-optical components, characterized in that they contain a liquid-crystalline medium according to any one of claims 1 to 10.

12. Display according to claim 11, characterized in that it is based on the IPS- or FFS mode.

13. 13. A display according to claim 11 or 12, characterized in that it comprises an active matrix addressable device.

14. The display according to any one of claims 11 to 13, characterized in that it is a gaming display or a mobile display.

15. Use of a medium according to any one of claims 1 to 10 in an electro-optical display or electro-optical component.

16. 11. A process for the preparation of a liquid-crystalline medium according to any one of claims 1 to 10, characterized in that one or more compounds of formula T are mixed with one or more compounds of formula L and one or more further mesogenic compounds.

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