Liquid crystal medium and liquid crystal display including the same

Abstract

To provide a liquid crystal medium used for IPS and FFS displays.SOLUTION: A liquid crystal medium contains a compound of formula T (where RS1, RS2 each denote alkyl or the like, YS1, YS2 each denote H or F).SELECTED DRAWING: None

Description

Technical Field

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

Background Art

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

[0003] IPS and FFS displays using a dielectrically positive liquid crystal are well known in the art and have been widely adopted, for example, in notebook computers, desktop monitors, TV sets, etc., and also in various types of displays for portable applications.

[0004] However, recently, IPS and especially FFS displays using a dielectrically negative liquid crystal have been widely adopted. An FFS display using a dielectrically negative liquid crystal is sometimes called UB-FFS (ultra bright FFS). Such displays are disclosed in U.S. Patent Application Publication No. 2013 / 0207038 (Patent Document 1). These displays are characterized by a significantly increased transmittance as compared with the IPS and FFS displays that have been used heretofore and have a dielectrically positive liquid crystal. However, these displays using a dielectrically negative liquid crystal have a very disadvantageous point in that they require a higher operating voltage than individual displays using a dielectrically positive liquid crystal. 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 a homogeneous alignment is preferred.

[0006] In order to industrially apply this effect in an electro-optical display element, an LC phase that satisfies a number of requirements is needed. Particularly important here is chemical resistance to physical effects such as moisture, air, and radiation in the thermal, infrared, visible, and ultraviolet regions, as well as DC (direct current) and AC (alternating current) electric fields.

[0007] Furthermore, an industrially usable LC phase is required to have a liquid crystal mesophase and a low viscosity within an appropriate temperature range.

[0008] Among the series of compounds disclosed to date that have a liquid crystal mesophase, there is no single compound that satisfies all of these requirements. Therefore, in order to obtain a substance that can be used as an LC phase, generally, a mixture of 2 to 25 kinds, preferably 3 to 18 kinds of compounds is prepared.

[0009] Matrix liquid-crystal displays (MLC displays) are known. Nonlinear elements that can be used to switch individual pixels are, for example, active elements (i.e., transistors). In general, the term "active matrix" is used when thin-film transistors (TFTs) are used, and TFTs are generally arranged on a glass plate as a substrate.

[0010] They are distinguished into two technologies: 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 currently has the greatest commercial importance worldwide.

[0011] While a TFT matrix is formed on the inside of one glass plate of the display, the other glass plate holds a transparent counter electrode on its inside. Compared to the size of the pixel electrodes, the TFTs are very small and, in fact, have no adverse effect on the image. Also, this technology can be extended to full-color displays, and in full-color displays, a mosaic of red, green, and blue filters is arranged so as to face each of the switchable pixels of the filter elements.

[0012] The most commonly used TFT displays so far usually operate with transmissive crossed polarizers and are illuminated by a backlight. For TV applications, ECB (or VAN) cells or FFS cells are used, while for monitors, IPS cells or TN (twisted nematic) cells are usually used, and for notebooks, laptops, and portable applications, TN, VA, or FFS cells are usually used.

[0013] The term MLC display, as used herein, encompasses any matrix display having integrated non-linear elements, i.e., in addition to active matrices, displays comprising 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 automotive manufacturing or on board aircraft. In addition to problems related to the angle dependence of contrast and response time, there are also problems in MLC displays due to the fact that the resistivity of the liquid crystal mixture is not high enough [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", page 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", page 145ff, Paris (Non-Patent Document 2)]. As the resistance decreases, the contrast of the MLC display deteriorates. Since the resistivity of the liquid crystal mixture generally decreases over the life of the display due to interaction with the inner surface of the display, a high (initial) resistance is very important for the display to have an acceptable resistance value during long operating periods.

[0015] In a general form, for example, the technologies are compared in 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 3) and Miller, Ian, SID Seminar 2004, Seminar M-7: "LCD-Television", Seminar Lecture Notes, M-7 / 1~M-7 / 32 (Non-Patent Document 4). Although the response time of recent ECB displays has already been significantly improved by address methods such as overdrive, for example: 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 a response time capable of handling video is still an issue that has not been satisfactorily resolved, especially in the switching of intermediate tones (gray shading).

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

[0017] Generally in a display, that is, also in a display due to these aforementioned effects, the operating voltage must be as low as possible. Therefore, a liquid crystal medium mainly composed generally of liquid crystal compounds having the same sign of dielectric anisotropy and having the highest possible value of dielectric anisotropy is used. Generally, a relatively small amount of neutral compounds are used, and compounds having the opposite sign of dielectric anisotropy to the medium are not used as much as possible. Thus, for example, in the case of a negative dielectric anisotropy liquid crystal medium for an ECB or UB-FFS display, compounds having a negative dielectric anisotropy are mainly used. The individual liquid crystal media used generally consist mainly of, and more usually substantially of, liquid crystal compounds having a negative dielectric anisotropy.

[0018] In the media used according to the present application, since liquid crystal displays are generally intended to have the lowest possible addressing voltage, a significant amount of a dielectrically positive liquid crystal compound and generally only a very small amount of a dielectrically negative compound are typically used, or even no dielectrically negative compound is used at all. At the same time, in some cases, a small amount of a dielectrically neutral compound can be beneficially used.

[0019] Liquid crystal media having positive dielectric anisotropy for IPS and FFS displays have already been disclosed. Some examples are shown below.

[0020] German Patent Application Publication No. 10 2016 003 902.3 (Patent Document 2), European Patent Application Publication No. 3 081 620 (Patent Document 3) and European Patent Application Publication No. 3 095 834 (Patent Document 4) relate to liquid crystal compounds and liquid crystal media for use in their respective displays.

[0021] Also, European Patent Application No. 17164891.8 (Patent Document 5), European Patent Application No. 16190393.5 (Patent Document 6), European Patent Application No. 16194162.0 (Patent Document 7), European Patent Application No. 16197206.2 (Patent Document 8) and European Patent Application No. 16199580.8 (Patent Document 9), which are unpublished and pending with the applicant of the present application, also relate to liquid crystal compounds and liquid crystal media for use in their respective displays.

[0022] The compound of the following formula:

[0023]

Chemical formula

[0024] European Patent Application No. 19185360.5 (Patent Document 11), although not yet published, the compound of the following formula:

[0025]

Chemical formula

[0026] [Chemical formula] including (CLP-V-n, n = 1), and another one additionally:

[0027] [Chemical formula] discloses a liquid crystal medium containing (CLP-n-T, n = 3).

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

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

[0030] Proper stability of the medium against extreme loads, especially UV exposure and heat, is very particularly important. Especially in the case of display applications in portable devices such as mobile phones, this can be extremely important.

[0031] In addition to the relatively poor transmittance and relatively long response time of MLC displays, the MLC displays disclosed so far have further problems. For example, the relatively low contrast, relatively high viewing angle dependence of MLC displays, and the particular difficulty in reproducing intermediate tones (gray shading) in these displays, especially when viewed from an oblique viewing angle, as well as the insufficient VHR and insufficient lifespan of MLC displays. To improve the energy efficiency of MLC displays and the ability to handle fast-moving images in individual MLC displays, desirable improvements in the transmittance and response time of the displays are required.

[0032] Therefore, there is still a strong demand for MLC displays that have a very high specific resistance while having a wide operating temperature range, short response time, and low threshold voltage, which can produce various intermediate tones (gray shading) thanks to these, and in particular, have good and stable VHR.

Prior Art Documents

Patent Documents

[0033]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Patent Document 9

[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., Proc. Eurodisplay, Vol. 84, September 1984, "Design of Thin Film Transistors for Matrix Addressing of Television Liquid Crystal Displays", 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: "A 57-in. Wide UXGA TFT-LCD for HDTV Application", SID 2004 International Symposium, Digest of Technical Papers, XXXV, Book I, pp. 106-109 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0035] The present invention aims to provide an MLC display that is not only for monitors and TVs but also for gaming and portable applications such as phones and navigation systems, based on the ECB, IPS or FFS effect, without or reduced from the above-described problems, and at the same time has a very high resistivity. In particular, in mobile phones and navigation systems, it must be ensured that they function even at extremely high and low temperatures. MEANS FOR SOLVING THE PROBLEMS

[0036] Surprisingly, by using a nematic liquid crystal mixture containing at least one, preferably two or more compounds of formula T (the compounds of formula T are preferably selected from the groups of compounds of sub-formulas T-1 and T-2) and one or more compounds of formula L (the compounds of formula L are preferably selected from the groups of compounds of sub-formulas L-1 and L-2), preferably additionally at least one compound, preferably two or more compounds selected from the groups of compounds of formulas II and III (the compounds of formula II are preferably compounds of II-1 and / or II-2), and / or at least one compound, preferably two or more compounds selected from the groups of compounds of formulas IV and / or V (the formulas are all defined hereinafter) in a display device, particularly in IPS and FFS displays, it has been found that a liquid crystal display can be achieved with a short response time, a low threshold voltage, a sufficiently wide nematic phase, a preferably relatively high birefringence (Δn), and at the same time, high transmittance, good stability against decomposition by heat and UV exposure, and a stable and high VHR.

Embodiments for Carrying Out 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 groups of compounds of formulas 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 groups of compounds of formulas IV and V, and again preferably one or more compounds selected from the groups of compounds of formulas VI to IX (the formulas are all defined hereinafter).

[0039] The mixture according to the invention exhibits a very wide nematic phase range with a clearing point of 70 °C or higher, a very favorable value of the capacitance threshold, a relatively high value of the retention rate, and at the same time good low-temperature stability at -20 °C and -30 °C and a very low rotational viscosity. The mixture according to the invention is further distinguished by a good ratio of the clearing point to the 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 specific combination of physical properties. The most decisive of these is a high value of the elastic constant, in particular a high k 11 , and an excellent low ratio of the rotational viscosity (γ1) to the elastic constant (k 11 ), i.e., (γ1 / k 11 ).

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

[0042] The liquid crystal medium of the present invention preferably has a dielectric anisotropy (Δε) of 0.5 or more and contains the following components.

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

[0044]

Chemical formula

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

[0046]

Chemical formula

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

[0048]

Chemical formula

[0049]

Chemical formula

[0050] [Chemical formula] L 31 and L 32 each independently represents H or F, preferably, L 31 represents F, X 3 is halogen, halogenated alkyl or alkoxy having 1 - 3 C atoms, or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, representing F, Cl, -OCF3, -OCHF2, -O - CH2CF3, -O - CH=CF2, -O - CH=CH2 or -CF3, very preferably representing F, Cl, -O - CH=CF2, -OCHF2 or -OCF3. Z 3 is -CH2CH2-, -CF2CF2-, -COO-, trans -CH=CH-, trans -CF=CF-, -CH2O- or a single bond, preferably representing -CH2CH2-, -COO-, trans -CH=CH- or a single bond, very preferably representing -COO-, trans -CH=CH- or a single bond. n is 0, 1, 2 or 3, preferably representing 1, 2 or 3, particularly preferably 1. However, one or more, preferably one of the aromatic rings may be optionally substituted by an alkyl group, preferably methyl.

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

[0052] [Chemical formula] In the formula, R 41and R 42 are, independently of one another, those meanings given above for R in formula II 2 , preferably, R 41 represents alkyl, R 42 represents alkyl or alkoxy, or R 41 represents alkenyl, R 42 represents alkyl, provided that one -CH2- group may be replaced by cyclo - propylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene, preferably by cyclopropylene or 1,3 - cyclopentylene

[0053] [Chemical formula] Z 41 and Z 42 are, independently of one another, and when Z 41 appears twice, these are also independently of one another, -CH2CH2-, -COO-, trans -CH=CH-, trans -CF=CF-, -CH2O-, -CF2O-, -C≡C- or a single bond, preferably, one or more of them represents a single bond p is 0, 1 or 2, preferably represents 0 or 1 R 51 and R 52 are, independently of one another, R 41 and R 42 have one of the meanings given for R and R , 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, alkenyl or alkenyloxy having 2 to 7 C atoms, preferably having 2 to 4 C atoms, preferably represents alkenyloxy, provided that one -CH2- group may be replaced by cyclo - propylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene, preferably by cyclopropylene or 1,3 - cyclopentylene

[0054] [Chemistry] Preferably

[0055] [Chemistry] Preferably,

[0056] [Chemistry] And, if present,

[0057] [Chemistry] Z 51 ~Z 53 are each independently of the other, -CH2-CH2-, -CH2-O-, -CH=CH-, -C≡C-, -COO- or a single bond, preferably, -CH2-CH2-, -CH2-O- or a single bond, particularly preferably a single bond, i and j each independently of the other represent 0 or 1, (i + j) preferably represents 0, 1 or 2, more preferably 0 or 1, most preferably 1, provided that one or more, preferably one, of the aromatic rings present may be optionally substituted by an alkyl group, preferably methyl.

[0058] Throughout this application, 1,3-cyclopentenylene is a substructure selected from the group of the following formulas.

[0059] [Chemistry]

[0060] The liquid crystal medium according to this application preferably has a nematic phase.

[0061] The present invention also relates to the simultaneous use of compounds of the formulas T and L shown above, in which the parameters have each meaning having each of the preferred meanings shown above and below.

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

[0063]

Chemical formula

[0064] In the liquid crystal medium according to the present invention, the compound of formula T-1 used is 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, and preferably from formula T-1-3.

[0065]

Chemical formula

[0066] In the liquid crystal medium according to the present invention, the compound of formula T-2 used is preferably selected from the group of compounds of formulae T-2-1 to T-2-3, preferably from formulae T-2-2 and T-2-3, and preferably from formula T-2-3.

[0067]

Chemical formula

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

[0069] In the liquid crystal medium according to the present invention, the compound of formula L used is preferably selected from the group of compounds of formulae L-1 and L-2, preferably of formula L-1, and more preferably from both compounds of formula L-1 and formula L-2.

[0070]

Chemical formula

[0071] In the liquid crystal medium according to the present invention, the compound of formula L-1 is 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, and most preferably from formula L-1-1.

[0072]

Chemical formula

[0073] In the liquid crystal medium according to the present invention, the compound of formula L-2 is 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, and most preferably from formula L-2-3.

[0074]

Chemical formula

[0075] Compounds of formula L, for example compounds of formulae CLP-V-n, CLP-1V-n and CLP-n-T, are prepared according to known synthetic routes.

[0076] The present invention further relates to a liquid crystal display containing a liquid crystal medium according to the invention, in particular an IPS or FFS display, particularly preferably an FFS or SG-FFS display.

[0077] The present invention further relates to a liquid crystal cell consisting of two substrates (where at least one substrate is transparent to light and at least one substrate has an electrode layer), and a liquid crystal medium layer disposed between the substrates and containing a polymerized component and a low molecular weight component (where the polymerized component can be obtained by polymerizing one or more polymerizable compounds in the liquid crystal medium between the substrates of the liquid crystal cell, preferably while applying a voltage, and the low molecular weight component is a liquid crystal mixture according to the invention as described above and below), and an IPS or FFS type liquid crystal display containing the liquid crystal cell.

[0078] The display according to the invention is preferably addressed by an active matrix (active matrix LCD, abbreviated as AMD), preferably a thin-film transistor (TFT). However, the liquid crystals according to the invention can also be used in an advantageous manner in displays having other known addressing methods.

[0079] The present invention further relates to a method for preparing a liquid crystal medium according to the invention by mixing one or more compounds selected from the group of compounds of formula T and L, preferably of formulae T-1 and / or T-2, with one or more compounds of formula L-1 and / or L-2, with one or more low molecular weight liquid crystal compounds or liquid crystal mixtures, and, as optional components, with further liquid crystal compounds and / or additives.

[0080] The following meanings apply above and below.

[0081] The term "mesogenic group" is known to those skilled in the art and is described in the literature, and represents a group that essentially contributes to the generation of a liquid-crystalline (LC) phase in low-molecular-weight or high-molecular-weight 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. Also, it is possible for the mesogenic compound to exhibit liquid-crystalline phase behavior only after mixing with other compounds and / or after polymerization. Typical mesogenic groups are, for example, units having a rigid rod-like or disc-like shape. An overview of the terms and definitions used for mesogens or liquid-crystalline 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 simply "spacer", also referred to as "Sp" above and below, is known to those skilled in the art and is 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 represents a flexible group that connects a mesogenic group and one or more polymerizable groups to each other in a polymerizable mesogenic compound.

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

[0084] Particularly preferred are liquid-crystalline mixtures or liquid-crystalline media having a nematic phase, especially at room temperature.

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

[0086]

Chemical formula

[0087]

Chemical formula

[0088]

Chemical formula

[0089]

Chemical formula

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

[0091]

Chemical formula

[0092] The liquid crystal medium preferably contains a compound selected from the group of compounds of formulae II-1 and II-2 in which both L 21 and L 22 and / or both L 23 and L 24 represent F.

[0093] In a preferred embodiment, the liquid crystal medium contains a compound selected from the group of compounds of formulae II-1 and II-2 in which all of L 21 , L 22 , L 23 and L 24 represent F.

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

[0095]

Chemical formula

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

[0097]

Chemical formula

[0098]

Chemical formula

[0099] The liquid crystal medium preferably contains a compound selected from the group of compounds of formulae II-1a to II-1e in which both L 21 and L 22 represent F, and / or both L 23 and L 24 represent F.

[0100] In a preferred embodiment, the liquid crystal medium contains a compound selected from the group of compounds of formulae II-2a to II-2k in which all of L 21 L, 22 L, 23 and L 24 represent F.

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

[0102]

Chemical formula

[0103]

Chemical formula

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

[0105]

Chemical formula

[0106]

Chemical formula

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

[0108]

Chemical formula

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

[0110]

Chemical formula

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

[0112]

Chemical formula

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

[0114]

Chem.

[0115] The liquid crystal medium preferably contains one or more compounds of formula III-1i, and the compound is preferably selected from the group of compounds of formula III-1i-1 and III-1i-2, preferably formula III-1i-2.

[0116]

Chem.

[0117] The liquid crystal medium preferably contains one or more compounds of formula III-1j, and the compound is preferably selected from the group of compounds of formula III-1j-1 and III-1j-2, preferably formula III-1j-1.

[0118]

Chem.

[0119] The liquid crystal medium preferably contains one or more compounds of formula III-2. The compound of formula III-2 is preferably selected from the group of compounds of formula III-2a and III-2b, preferably formula III-2b.

[0120]

Chem.

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

[0122]

Chemical formula

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

[0124]

Chemical formula

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

[0126]

Chemical formula

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

[0128]

Chemical formula

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

[0130] In the present application, all elements include their respective isotopes. In particular, one or more H in the compound may be replaced by D, which is also particularly preferred according to the embodiment. By correspondingly highly deuterating the corresponding compound, for example, the detection and recognition of the compound can be made possible. This is, in some cases, very useful, especially in the case of the compounds of formula I.

[0131] In the present application, alkyl is particularly preferably straight-chain alkyl, in particular CH3-, C2H5-, n-C3H7-, n-C4H9- or n-C5H 11 represents -, alkenyl particularly preferably represents 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]

Chemical formula

[0134] R 42is an unsubstituted alkyl group having 1 to 7 carbon atoms, an unsubstituted alkenyl group having 2 to 7 carbon atoms or an unsubstituted alkoxy group having 1 to 6 carbon atoms (both preferably having 2 to 5 carbon atoms), an unsubstituted alkenyl group having 2 to 7 carbon atoms, preferably having 2, 3 or 4 carbon atoms, more preferably a vinyl group or a 1-propyl group, particularly 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] [Chemical formula] TIFF0007710843000061.tif32165TIFF0007710843000062.tif32165TIFF0007710843000063.tif32165 wherein alkyl and alkyl’ each independently represent an alkyl having 1 to 7 carbon atoms, preferably having 2 to 5 carbon atoms, alkenyl and alkenyl’ each independently represent an alkenyl group having 2 to 5 carbon atoms, preferably having 2 to 4 carbon atoms, particularly preferably having 2 carbon atoms, alkenyl’ represents an alkenyl group having 2 to 5 carbon atoms, preferably having 2 to 4 carbon atoms, particularly preferably having 2 to 3 carbon atoms, alkoxy represents an alkoxy having 1 to 5 carbon atoms, preferably having 2 to 4 carbon 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 more preferred embodiment, the medium comprises one or more compounds of formula V.

[0139] Preferably, the medium according to the present invention contains the following compounds at the following total concentrations: · One or more compounds selected from the group of compounds of formula T in a concentration of 5 to 60% by weight, and · One or more compounds selected from the group of compounds of formula L in a concentration of 5 to 60% by weight, preferably 10 to 50% by weight, and / or · One or more compounds of formula II, preferably selected from the group of compounds of formulae II-1 and II-2, in a concentration of 5 to 60% by weight, and / or · One or more compounds of formula III in a concentration of 5 to 25% by weight, and / or · One or more compounds of formula IV in a concentration of 5 to 45% by weight, and / or · One or more compounds of formula V in a concentration of 5 to 25% by weight, However, the total content of all compounds of formulae T, L, and II-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 more preferred embodiment, the medium according to the present invention, in addition to a compound of formula T or a preferred sub-formula thereof, preferably contains one or more preferably dielectrically neutral compounds selected from the group of compounds of formulae IV and V, preferably in a total concentration in the range of 5% or more to 90% or less, preferably 10% or more to 80% or less, particularly preferably 20% or more to 70% or less.

[0142] The medium according to the present invention in a particularly preferred embodiment contains one or more compounds of formula II in a total concentration in the range of 5% or more to 50% or less, preferably 10% or more to 40% or less.

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

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

[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% or more to 60% or less, more preferably 5% or more to 55% or less, still more preferably 10% or more to 50% or less, and most preferably 15% or more to 45% or less.

[0146] The present invention also relates to an electro-optical display or electro-optical component containing the liquid crystal medium according to the present invention. Based on the VA, ECB, IPS or FFS effect, preferably, an electro-optical display based on the VA, IPS or FFS effect, in particular, one addressed by an active matrix addressing device is preferred.

[0147] Thus, similarly, the present invention relates to the use of the liquid crystal medium according to the present invention in an electro-optical display or electro-optical component, and also to one or more compounds of formula T, preferably one or more compounds of sub-formula T-1 and / or T-2, with one or more compounds of formula L, preferably one or more compounds of formula L-1 and / or L-2, and / or one or more compounds selected from formulae IV and V, and one or more compounds of formula II-1, II-2, and preferably one or more further compounds selected from the group of compounds of formulae IV and V, more preferably one or more compounds of both formula IV and formula V, and relates to a method for preparing a liquid crystal medium according to the present invention, characterized by mixing them.

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

[0149]

Chemical formula

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

[0151]

Chemical formula

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

[0153]

Chemical formula

[0154] In addition, the present invention relates to a method for reducing the wavelength dispersion of a liquid crystal medium containing one or more compounds of formula II and optionally containing 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 a dielectrically positive component, the total concentration of which is preferably 20% or less, more preferably 10% or less, based on the total medium.

[0157] In a preferred embodiment, the liquid crystal medium according to the invention, in total amounts based on the total mixture · from 1% to 50%, preferably from 2% to 35%, particularly preferably from 3% to 25% of the compound of formula T and · from 1% to 20%, preferably from 2% to 15%, particularly preferably from 3% to 12% of the compound of formula L and · from 20% to 50%, preferably from 25% to 45%, particularly preferably from 30% to 40% of the compound of formula II and / or III, and · from 0% to 35%, preferably from 2% to 30%, particularly preferably from 3% to 25% of the compound of formula IV and / or V.

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

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

[0160] In a preferred embodiment of the present application, the compound of formula T is preferred per se and is preferably used in a liquid crystal medium, wherein Y S1 is F, and Y S2 is H, or the compound of formula T is such that Y S1 and Y S2 are both F.

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

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

[0163] ii) The liquid crystal medium has a birefringence of 0.250 or less, particularly preferably 0.220 or less.

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

[0165] vi) The total concentration of the compound of formula IV in the whole mixture is 25% or more, preferably 30% or more, preferably in the range of 25% or more to 49% or less, particularly preferably in the range of 29% or more to 47% or less, very particularly preferably in the range of 37% or more to 44% or less.

[0166] v) The liquid crystal medium contains one or more compounds of formula IV selected from the group of compounds of the following formulas: CC-n-V and / or CC-n-Vm and / or CC-V-V and / or CC-V-Vn and / or CC-nV-Vn, particularly preferably the compound of CC-3-V, preferably up to 60% or less, particularly preferably up to 50% or less in concentration, optionally CC-3-V1 preferably up to 15% or less in concentration, and / or CC-4-V preferably up to 24% or less, particularly preferably up to 30% or less in concentration may be additionally contained.

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

[0168] vii) The total concentration of the compound of the 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 crystal medium contains at least one compound 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 crystal medium contains at least one compound of the formula V, preferably of the formula V-1 and / or V-2, preferably in a total concentration of 1% or more, in particular 2% or more, very particularly preferably 15% or more and 35% or less, preferably 30% or less.

[0171] x) The total concentration of the compound of the formula CCP-V-n, 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 the compound of the formula CCP-V2-n, preferably CCP-V2-1, in the entire mixture is preferably 1% or more and 15% or less, preferably 2% or more and 10% or less.

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

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

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

[0176] The mixture according to the invention is suitable for all IPS and FFS-TFT applications using a dielectrically positive liquid crystal medium.

[0177] The liquid crystal medium according to the invention preferably consists substantially completely of 4 to 18, in particular 5 to 15, particularly preferably 12 or fewer compounds. These are preferably selected from the group of compounds of the formulas T, L, II, III, IV and V.

[0178] The liquid crystal medium according to the invention may also contain more than 18 compounds. In this case, the medium preferably contains 18 to 25 compounds.

[0179] In a preferred embodiment, the liquid crystal medium according to the invention consists mostly, preferably essentially, most preferably substantially completely of compounds which do not contain a cyano group.

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

[0181] The liquid crystal medium according to the invention has in each case a nematic phase preferably at least down to -10 °C to up to 70 °C, particularly preferably down to -20 °C to up to 80 °C, very particularly preferably down to -30 °C to up to 85 °C, most preferably down to -40 °C to up to 90 °C.

[0182] In this specification, the expression "having a nematic phase" means, on the one hand, that no smectic phase and crystallization are confirmed at low temperatures corresponding to the corresponding temperature, and on the other hand, no transparency occurs even when heated from the nematic phase. The examination at low temperatures is carried out in a rheometer at the corresponding temperature and confirmed by storing in a test cell having a layer thickness corresponding to electro-optical applications for at least 100 hours. When the storage stability at a temperature of -20°C in the corresponding test cell is 1000 hours or more, the medium is considered stable at this temperature. At temperatures of -30°C and -40°C, the corresponding times are 500 hours and 250 hours, respectively. At high temperatures, the clearing point is measured by a conventional method in a capillary.

[0183] Preferably, the liquid crystal medium according to the present invention has a relatively low threshold voltage (V0) in the range of 1.0V or more to 2.7V or less, preferably 1.2V or more to 2.5V or less, particularly preferably 1.3V or more to 2.2V or less.

[0184] In addition, the liquid crystal medium according to the present invention has a high value of VHR in a liquid crystal cell.

[0185] In a cell newly filled in the cell 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%. After 5 minutes in an oven in the cell at 100°C, 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 generally, a liquid crystal medium with a low address voltage or threshold voltage has a lower VHR than a liquid crystal medium with a high address voltage or threshold voltage, and vice versa. These preferred values of the individual physical properties are preferably maintained in combination with each other by the medium according to the present invention in each case.

[0187] In the present application, the term "compound" is also described as "compound(s) (one or more types)", and unless otherwise specified, it means both a single compound and multiple compounds.

[0188] In a preferred embodiment, the liquid crystal medium according to the present invention · one or more compounds of formula T-1, and · one or more compounds of formula T-2, and / or · one or more compounds of formula L-1 and / or L-2, preferably one or more compounds of formula L-1 and L-2, and / or · one or more compounds of formula II, preferably compounds selected from the group consisting of formulae PUQU-n-F, CDUQU-n-F, APUQU-n-F and PGUQU-n-F, and / or, · one or more compounds of formula III, preferably compounds selected from the group consisting of formulae CCP-n-OT, CLP-n-T, CGG-n-F and CGG-n-OD, and / or, · one or more compounds of formula IV, preferably compounds selected from the group consisting of formulae CC-n-V, CC-n-Vm, CC-n-m and CC-V-V, and / or, · one or more compounds of formula V, preferably compounds selected from the group consisting of formulae CCP-n-m, CCP-V-n, CCP-V2-n, CLP-V-n, CCVC-n-V and CGP-n-m, and / or, · Optionally, preferably as an essential component, one or more compounds of formula IV, preferably selected from the group of compounds of formulae CC-n-V, CC-n-Vm and CC-nV-Vm, preferably selected from the group of compounds CC-3-V, CC-3-V1, CC-4-V, CC-5-V and CC-V-V, particularly preferably selected from the group of compounds CC-3-V, CC-3-V1, CC-4-V and CC-V-V, very particularly preferably the compound CC-3-V, and additionally as an optional component, compounds of formula CC-4-V and / or CC-3-V1 and / or CC-V-V, and / or, · Optionally, preferably as an essential component, one or more compounds of formula V, preferably compounds of formula CCP-V-1 and / or CCP-V2-1 includes.

[0189] In the present invention, unless otherwise indicated in individual cases, the following definitions are applied in relation to the identification of the constituents of the composition.

[0190] · "comprises": The concentration of the constituent in question in the composition is preferably 5% or more, particularly preferably 10% or more, and very particularly preferably 20% or more. · "consists predominantly of": The concentration of the constituent in question in the composition is preferably 50% or more, particularly preferably 55% or more, and very particularly preferably 60% or more. · "consists essentially of": The concentration of the constituent in question in the composition is preferably 80% or more, particularly preferably 90% or more, and very particularly preferably 95% or more, and · "consists substantially entirely of": The concentration of the constituent in question in the composition is preferably 98% or more, particularly preferably 99% or more, and very particularly preferably 100.0%.

[0191] The above definitions apply both to the medium as a composition having constituents that can be components and compounds, and to the components having components and compounds. As far as the concentration of an individual compound relative to the whole medium is concerned, the term "comprises" means that the concentration of the compound in question is preferably 1% or more, particularly preferably 2% or more, and 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]

Chem.

[0194]

Chem.

[0195]

Chemical formula

[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, in each case, determining the capacitance of the mixture obtained at a temperature of 20 °C and a frequency of 1 kHz in at least one test cell having a cell thickness of 20 μm, a homeotropic surface alignment, and a homogeneous surface alignment. The measurement voltage is typically 1.0 V, but is always made lower than the capacitance threshold of each liquid crystal mixture under consideration.

[0197] The host mixture used for dielectrically positive and dielectrically neutral compounds is ZLI - 4792, and the host mixture used for dielectrically negative compounds is ZLI - 2857, both of which are manufactured by Merck KGaA, Germany. The value of each compound under consideration is obtained from the change in the dielectric constant of the host mixture after adding the compound under consideration, and the compound used is extrapolated to 100%. The compound under consideration 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 step by step until the examination can be carried out at the desired temperature.

[0198] If necessary, the liquid crystal medium according to the invention may also contain, in customary amounts, further additives, for example stabilizers and / or pleochroic, for example dichroic dyes and / or chiral dopants. The amounts of these additives used are preferably in a total amount, based on the amount of the mixture as a whole, of from 0% to 10% by weight, particularly preferably from 0.1% to 6% by weight. The concentration of the individual compounds used is preferably from 0.1% to 3% by weight. The concentrations of these and similar additives are generally not taken into account when specifying the concentration and concentration range of the liquid crystal compounds in the liquid crystal medium.

[0199] In a preferred embodiment, the liquid crystal medium according to the invention contains a polymer precursor which contains, in customary amounts, one or more reactive compounds, preferably reactive mesogens, and, if necessary, further additives such as, for example, polymerization initiators and / or polymerization retarders. The amounts of these additives used are in a total amount, based on the amount of the mixture as a whole, of from 0% to 10% by weight, particularly preferably from 0.1% to 2% by weight. The concentrations of these and similar additives are generally not taken into account when specifying the concentration and concentration range of the liquid crystal compounds in the liquid crystal medium.

[0200] The composition consists of a plurality of compounds, preferably from 3 to 30, particularly preferably from 6 to 20, very particularly preferably from 10 to 16 compounds, and these compounds are mixed by conventional methods. Generally, the desired amounts of the components used in smaller amounts are dissolved in the components which constitute the main constituents of the mixture. This can be done effectively by raising the temperature. If the temperature selected is above the clearing point of the main constituent, it is particularly easy to observe the completion of the dissolution operation. However, it is also possible to prepare the liquid crystal mixture by other conventional methods, for example using a premix or from a so-called "multi-bottle system".

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

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

[0203] The structure of the liquid crystal display according to the invention corresponds to a normal configuration as described, for example, in European Patent Application Publication No. 0 240 379.

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

[0205] Table E below shows candidates for dopants that can be added to the mixture 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] Table F below shows stabilizers that can be added to the mixture according to the invention, preferably in an amount of 0.01% to 6%, particularly 0.1% to 3%.

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

[0208] Unless otherwise clearly indicated, all temperature values shown in this application, such as the melting point T(C,N), the transition T(S,N) from the smectic (S) to the nematic (N) phase, and the clearing point T(N,I), are indicated in degrees Celsius (°C), and correspondingly all temperature differences are indicated in degrees of difference (°). Unless otherwise clearly indicated in the present invention, the term "threshold voltage" relates to the capacitance threshold (V0), also known as the Frederiks threshold.

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

[0210] Electro-optical properties, such as the threshold voltage (V0) (capacitance measurement), are determined in test cells manufactured by Merck Japan, similar to the switching behavior. The measurement cell has soda-lime glass substrates and is constructed in an ECB or VA configuration with polyimide alignment layers (SE-1211 and diluent ** 26 (mixing ratio 1:1), both manufactured by Nissan Chemical Industries, Ltd., Japan), and the alignment layers are rubbed orthogonally to each other, producing an effect that the liquid crystal has a homeotropic alignment. The transmission surface area is a substantially square ITO electrode, 1 cm 2 in size. Unless otherwise indicated, no chiral dopant is added to the liquid crystal mixture used, but the liquid crystal mixture used in the present invention is also suitable for applications where this type of doping is required.

[0211] The rotational viscosity is determined using the rotational permanent magnet method, and the kinematic viscosity is determined in a modified Ubbelohde viscometer. The liquid crystal mixtures ZLI-2293, ZLI-4792 and MLC-6608 are all products of Merck KGaA, Darmstadt, Germany, and the values of the rotational viscosity determined at 20 °C are 161 mPa·s, 133 mPa·s and 186 mPa·s respectively, and the kinematic viscosity (ν) is 21 mm2 ·s -1 、 14 mm 2 ·s -1 and 27 mm 2 ·s -1 is.

[0212] For practical purposes, the dispersibility of the refractive index of the material has conventionally been characterized as follows and, unless otherwise stated, is used throughout this application. The value of birefringence is determined at several fixed wavelengths at a temperature of 20 °C using a modified Abbe refractometer having a homeotropic alignment surface on the side in contact with the material of the prism. The value of birefringence is determined at the wavelengths of 436 nm (each selected spectral line of a low-pressure mercury lamp), 589 nm (sodium D line), and 633 nm (wavelength of a He-Ne laser) of specific values, using a combination of an attenuator / diffuser to prevent damage to the observer's eyes. In the following table, 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: V0 Capacitance threshold voltage at 20 °C [V] n e Anomalous refractive index measured at 20 °C and 589 nm n0 Ordinary refractive index measured at 20 °C and 589 nm Δn 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) Change in optical anisotropy defined as follows Δn(20 °C, 436 nm) - Δn(20 °C, 633 nm) Δ(Δn * ) "Relative change in optical anisotropy" defined as follows Δ(Δn) / Δn(20 °C, 589 nm) ε ⊥ Dielectric constant perpendicular to the director at 20 °C and 1 kHz ε ∥Dielectric constant parallel to the director at 20 °C and 1 kHz Δε Dielectric anisotropy at 20 °C and 1 kHz (Δε = ε ∥ -ε ⊥ ) ε av. Average dielectric constant at 20 °C and 1 kHz (ε av. = 1 / 3[ε ∥ + 2ε ⊥ ) T(N,I) or cl.p. clearing point [°C] ν Kinematic viscosity measured at 20 °C [mm 2 ·s -1 γ Rotational viscosity measured at 20 °C [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 the phase determined in the LTS test cell VHR Voltage holding ratio ΔVHR Decrease in voltage holding ratio S rel Specific stability of VHR

[0214] The following examples illustrate the invention without limiting it. However, the following examples show those skilled in the art the concept of preferred mixtures together with the compounds preferably used, their respective concentrations and their combinations with each other. In addition, the following examples illustrate achievable properties and combinations of properties.

[0215] In the present invention and especially in the following examples, the structures of the liquid crystal compounds are indicated by initials, and the conversion to chemical formulas is carried out according to Tables A - C below. All groups C n H 2n+1 、C m H 2m+1 およびC l H 2l+1 またはC​n H 2n 、 C m H 2m and C l H 2l In each case, H, C and H are straight-chain alkyl or alkenyl groups having carbon numbers n, m and l, respectively. 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 nuclear structure of the compounds, Table B lists the bridging units, and Table C lists the meanings of the symbols for the terminal groups on the left or right side of the molecule. The initials consist of the code for the ring element together with any optionally present linking group, followed by the first hyphen and the code for the left terminal group, the second hyphen and the code for the right terminal group. Table D shows examples of the structural descriptions of the compounds together with their respective abbreviations.

[0216] <Table A: Ring elements>

[0217]

Table 1

[0218]

Table 2

[0219] <Table B: Bridging units>

[0220]

Table 3

[0221] <Table C: Terminal groups>

[0222]

Table 4

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

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

[0225] Exemplary preferably used compounds of formula T

[0226] [Table 5] TIFF0007710843000078.tif48165TIFF0007710843000079.tif37165TIFF0007710843000080.tif42165TIFF0007710843000081.tif48165

[0227] [Table 6] TIFF0007710843000083.tif49165TIFF0007710843000084.tif49165TIFF0007710843000085.tif47165TIFF0007710843000086.tif43165

[0228] Additional compounds containing a thiophene ring

[0229] [Table 7] TIFF0007710843000088.tif37165TIFF0007710843000089.tif37165TIFF0007710843000090.tif42165TIFF0007710843000091.tif42165TIFF0007710843000092.tif48165

[0230] [Table 8]

[0231] Exemplary preferably used compound of formula L

[0232] [Table 9] TIFF0007710843000095.tif36165

[0233] Further compounds

[0234] [Table 10] TIFF0007710843000097.tif42165

[0235] [Table 11] TIFF0007710843000099.tif42165TIFF0007710843000100.tif42165TIFF0007710843000101.tif42165TIFF0007710843000102.tif42165

[0236] [Table 12] TIFF0007710843000104.tif42165TIFF0007710843000105.tif42165

[0237] Exemplary preferably high ε ⊥ Compound of formula I-S-02 having:

[0238] [Table 13] TIFF0007710843000107.tif42165

[0239]

Table 14

[0240]

Table 15

[0241]

Table 16

[0242]

Table 17

[0243]

Table 18

[0244] Exemplary Preferred Dielectrically Positive Compounds

[0245] [Table 19] TIFF0007710843000131.tif36165TIFF0007710843000132.tif39165TIFF0007710843000133.tif39165TIFF0007710843000134.tif36165TIFF0007710843000135.tif39165

[0246] [Table 20] TIFF0007710843000137.tif39165TIFF0007710843000138.tif39165TIFF0007710843000139.tif45165TIFF0007710843000140.tif36165TIFF0007710843000141.tif39165

[0247] [Table 21] TIFF0007710843000143.tif68165TIFF0007710843000144.tif45165TIFF0007710843000145.tif45165TIFF0007710843000146.tif40165

[0248] [Table 22] TIFF0007710843000148.tif42152TIFF0007710843000149.tif42152TIFF0007710843000150.tif36152TIFF0007710843000151.tif36152TIFF0007710843000152.tif36152

[0249]

Table 23

[0250]

Table 24

[0251]

Table 25

[0252]

Table 26

[0253]

Table 27

[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 the chiral dopants preferably used in the mixtures according to the present invention.

[0262]

[0263]

Table 34

[0264]

Table 35

[0265]

Table 36

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

[0267] In addition to the compounds of formula I in Table F, stabilizers that can be preferably used in the mixtures according to the present invention are shown. Here, the parameter n represents an integer in the range of 1 to 12. In particular, the following phenolic derivatives can be used as additional stabilizers because they act as antioxidants.

[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 present invention, the medium according to the present invention contains one or more compounds selected from the group of compounds in Table F, particularly one or more compounds selected from the group of compounds of the following formula.

[0276] [Chemical formula] [Examples]

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

[0278] [Compound Example] The compound of formula T is, for example, as follows.

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

[0280] [Chemical formula] 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] [Chemical formula] 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] [Chemical formula]

[0284]

Table 43

[0285] Similarly, the compound of the following formula T-2-3 is prepared.

[0286]

Chemical formula

[0287]

Table 44

[0288] Further compound examples

[0289]

Chemical formula

[0290]

Chemical formula

[0291]

Chemical formula

[0292] TIFF0007710843000200.tif29158(PGS-c5(en)-T)

[0293] TIFF0007710843000201.tif34152(PGS-c5-T)

[0294]

Chemical formula

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

[0296] [Mixture Example] The following are the disclosed exemplary mixtures.

[0297] [Example 1] Prepare and examine the following mixture (M-1).

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

[0299] [Example 2] Prepare and examine the following mixture (M-2).

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

[0301] [Example 3] Prepare and examine the following mixture (M-3).

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

[0303] [Example 4] Prepare and examine the following mixture (M-4).

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

[0305] <Example 5> Prepare the following mixture (M-5) and examine it.

[0306]

Table 49

[0307] <Example 6> Prepare the following mixture (M-6) and examine it.

[0308]

Table 50

[0309] <Example 7> Prepare the following mixture (M-7) and examine it.

[0310]

Table 51

[0311] <Example 8> Prepare the following mixture (M-8) and examine it.

[0312]

Table 52

[0313] <Example 9> Prepare the following mixture (M-9) and examine it.

[0314]

Table 53

[0315] <Example 10> Prepare the following mixture (M-10) and examine it.

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

[0317] <Example 11> Prepare the following mixture (M-11) and examine it.

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

[0319] <Example 12> Prepare the following mixture (M-12) and examine it.

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

[0321] <Example 13> Prepare the following mixture (M-13) and examine it.

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

[0323] <Example 14> Prepare the following mixture (M-14) and examine it.

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

[0325] <Example 15> Prepare and examine the following mixture (M-15).

[0326]

Table 59

[0327] <Example 16> Prepare and examine the following mixture (M-16).

[0328]

Table 60

[0329] <Example 17> Prepare and examine the following mixture (M-17).

[0330]

Table 61

[0331] <Example 18> Prepare and examine the following mixture (M-18).

[0332]

Table 62

[0333] <Example 19> Prepare and examine the following mixture (M-19).

[0334]

Table 63

[0335] <Example 20> Prepare and examine the following mixture (M-20).

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

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

[0338] [Chemical formula] (In the formula, the two O atoms bonded to the N atom represent radicals) is added to the mixture M-20 of the previous example. Examine the resulting mixture, mixture M-21. This mixture exhibits good stability against exposure to light irradiation and, at the same time, maintains other physical properties.

[0339] <Example 22> Prepare and examine the following mixture (M-22).

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

[0341] <Example 23> Prepare and examine the following mixture (M-23).

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

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

[0344]

Table 67

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

[0346]

Table 68

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

[0348]

Table 69

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

[0350]

Table 70

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

[0352]

Table 71

[0353] <Example 29> Prepare and examine the following mixture (M-29).

[0354]

Table 72

[0355] <Example 30> Prepare and examine the following mixture (M-30).

[0356]

Table 73

[0357] <Example 31> Prepare and examine the following mixture (M-31).

[0358]

Table 74

[0359] <Example 32> Prepare and examine the following mixture (M-32).

[0360]

Table 75

[0361] <Example 33>

[0362] Prepare and examine the following mixture (M-33).

[0363]

Table 76

[0364] <Example 34> Prepare and examine the following mixture (M-34).

[0365]

Table 77

[0366] <Example 35> Prepare and examine the following mixture (M-35).

[0367]

Table 78

[0368] <Example 36> Prepare and examine the following mixture (M-36).

[0369]

Table 79

[0370] <Example 37> Prepare and examine the following mixture (M-37).

[0371]

Table 80

[0372] <Example 38> Prepare and examine the following mixture (M-38).

[0373]

Table 81

[0374] <Example 39> Prepare and examine the following mixture (M-39).

[0375]

Table 82

[0376] <Example 40> Prepare and examine the following mixture (M-40).

[0377]

Table 83

[0378] <Example 41> Prepare and examine the following mixture (M-41).

[0379]

Table 84

[0380] <Example 42> Prepare and examine the following mixture (M-42).

[0381]

Table 85

[0382] <Example 43> Prepare and examine the following mixture (M-43).

[0383]

Table 86

Claims

1. One or more compounds of formula T, and One or more compounds of formula L A liquid crystal medium, characterized by comprising the same. 【Chemical 1】 (In the formula, R Ｓ１ and R Ｓ２ is alkyl, alkoxy having 1 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclopentenylene), or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclopentenylene). Alternatively, R Ｓ１ 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 represents X Ｓ and X Ｓ represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the latter four groups have 1 to 4 C atoms), and Y Ｓ１ and Y Ｓ２ each independently represents H or F, However, one or more of the aromatic rings may be optionally substituted with an alkyl group.) 【Chemical 2】 (In the formula, R Ｌ１ and R Ｌ２ each independently represents alkyl having 1 to 7 C atoms, alkoxy (provided that one —CH ２ — group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene), alkenyl having 2 to 7 C atoms, or alkenyloxy, alkoxyalkyl (provided that one —CH ２ — group may be replaced by cyclopropylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene), Alternatively, R Ｌ１ 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 represents X Ｌ and X Ｌ represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the latter four groups have 1 to 4 C atoms), and Y Ｌ１ and Y Ｌ２ each independently represents H or F, However, the aromatic ring may be optionally substituted with an alkyl group.)

2. The medium according to claim 1, characterized by comprising one or more compounds of formula T selected from the group of compounds of formula T-1 and T-2. [Chemical Formula 3] [Chemical] (In the formula, RS1, RS2, YS1 and YS2 have their respective meanings given in the above formula T, However, when RS2 is XS in formula T-1, it is excluded, In the formula, R Ｓ is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene), alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene), and X Ｓ represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the latter four groups have 1 to 4 C atoms), and However, one or more of the aromatic rings may be optionally substituted with an alkyl group.)

3. The medium according to claim 2, characterized by comprising one or more compounds of formula T-1.

4. The medium according to any one of claims 1 to 3, characterized by comprising one or more compounds of formula L selected from the group of compounds of formula L-1 and L-2. 【Chemical 4】 [Chemical] (In the formula, RL1, RL2, YL1 and YL2 have their respective meanings given in formula L in claim 1, provided that when RL2 is XL in formula L-1, it is excluded, In the formula, R Ｌ is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene), alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms (however, one - CH ２ - group may be replaced by cyclopropylene, 1,3 - cyclobutylene, 1,3 - cyclopentylene, 1,3 - cyclo - pentenylene), and X Ｌ represents F, Cl, CN, NCS, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenyloxy (the latter four groups have 1 to 4 C atoms), and However, one or more of the aromatic rings may be optionally substituted with an alkyl group.)

5. The medium according to claim 4, characterized by comprising one or more compounds of formula L-2.

6. The medium according to claim 4 or 5, characterized by comprising one or more compounds of formula L-1.

7. The medium according to any one of claims 1 to 6, characterized by comprising one or more compounds selected from the group of compounds of formula II and III. 【Chemical Formula 5】 【Chem.】 (In the formula, R ２ represents alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 carbon atoms, or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 carbon atoms, 【Chemical Formula 6】 L ２１ and L ２２ represents H or F, X ２ represents 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, m represents 0, 1, 2 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, 【Chemical Formula 7】 L ３１ and L ３２ each independently represents H or F, X ３ is halogen, haloalkyl or alkoxy having 1 to 3 C atoms, or haloalkenyl 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 and represents Z ３ represents -CH ２ CH ２ -, -CF ２ CF ２ -, -COO-, trans-CH=CH-, trans-CF=CF, CH ２ O- or a single bond, and n represents 0, 1, 2 or 3, However, one or more of the aromatic rings may be optionally substituted with an alkyl group, However, the compound of formula L is excluded from formula III.)

8. The liquid crystal medium according to any one of claims 1 to 7, characterized by comprising one or more compounds selected from the group of formula IV and V. 【Chemical 8】 (In the formula, R ４１ and R ４２ each independently has the meaning shown for R in Formula II in Claim 4 ２ and has 【Chemical Formula 9】 Z ４１ and Z ４２ are, independently of each other, and when Z ４１ appears twice, these are also independently of each other, -CH ２ CH ２ -, -COO-, trans-CH=CH-, trans-CF=CF-, -CH ２ O-, -CF ２ O-, -C≡C- or a single bond, p represents 0, 1 or 2, R ５１ and R ５２ each independently has one of the meanings given to R in claim 4 ４１ and R ４２ and has 【Chemical Formula 10】 Z ５１ to Z ５３ each independently represents -CH ２ -CH ２ -, -CH ２ -O-, -CH=CH-, -C≡C-, -COO- or a single bond, i and j each independently represent 0 or 1, However, one or more of the aromatic rings may be optionally substituted with an alkyl group, provided that the compound of formula L is excluded from formula IV.)

9. The medium according to claim 8, characterized in that the total concentration of the compound of formula T in the entire medium is 3% or more and 60% or less.

10. The medium according to any one of claims 1 to 9, characterized by additionally containing one or more chiral compounds.

11. An electro-optical display or electro-optical component, characterized by containing the liquid crystal medium according to any one of claims 1 to 10.

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

13. The display according to claim 11 or 12, characterized by containing an active matrix addressing device.

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

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

16. A method for preparing a liquid crystal medium according to any one of claims 1 to 10, characterized by mixing one or more compounds of formula T with one or more compounds of formula L and one or more additional mesogenic compounds.

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