TW200838987A - Liquid crystalline medium and liquid crystal display - Google Patents

Abstract

The instant invention relates to liquid crystalline media comprising a first dielectrically positive component, component A, comprising one or more compounds of formula I and one or more compounds selected from the group of formulae II and III and a second dielectrically positive component, component B, comprising one or more compounds of formula IV wherein the parameters have the meaning given in the specification and to liquid crystal displays comprising these media, especially to TN- and STN displays and in particular to STN displays.

Description

200838987 IX. Description of the invention: [Technical field of the invention] Liquid crystal display of a medium, etc., and in particular with respect to the present invention relates to a liquid crystal medium and, in particular, to a super-twisting direction by timing multiplex addressing Column (STN) display. [Prior Art] "Liquid Crystal Display (LCD) is used to display information. Uses such as electro-optical tweezers, twisted nematic (TN)_, super-twisted nematic (stn)_, optically compensated bends (click and electronically controlled birefringence (E-call mode and its various modifications, and other modes. In addition to the modes, all use an electric field that is substantially perpendicular to the substrate and correspondingly perpendicular to the liquid crystal layer, and an electric-light mode that uses an electric field that is substantially parallel to the substrate and correspondingly parallel to the liquid crystal layer, such as (example = In-plane switching mode (as disclosed in German Patent No. 4, 451 and European Patent No. 588 568). This electro-optic mode is especially useful for LCDs of modern desktop monitors and is intended for multimedia application displays. Application.

TN- and STN displays are widely used in, for example, cellular telephones and games. Some of the greatest advantages of such displays, in addition to low production costs, are their relatively low demand for operating voltages and their lower power consumption. The liquid crystal of the present invention is preferably used in such displays. For such displays, there is a need for novel liquid crystal media with improved performance. In particular, the dielectric anisotropy (Δε) should be high enough to allow for a suitably low operating power. Preferably, Δε should be higher than 3 〇 and preferably higher than 45, but preferably not higher than 80 ′ and especially not higher than 7 〇. Otherwise, the resistivity of the mixture tends to be as low as even unacceptable for most S-displays, s T]s [display 126111.doc 200838987 in this respect has a display that is addressed by the matrix of electrically actuated components - LCD or AMD) is not a strict requirement. In addition to this parameter, the medium must exhibit birefringence (Δη) suitable for a wide range of nematic phases, in the proper range for the electro-optic effect used, a relatively small degree of rotation, and at least sufficiently high as mentioned above. Specific resistance. The display of the present invention is preferably addressed by time series multiplexing, such as by, for example, AUmeshk. The proposed orthogonal waveform is also available by so-called active addressing, especially for fast switching displays. However, the liquid crystal of the present invention can also be advantageously used in displays that utilize other known addressing methods. There are various display modes for various composite systems using low molecular weight liquid crystal materials together with polymeric materials, such as polymer dispersed liquid crystals (pDLq·, nematically curved alignment phase (10) AP) and polymer networks (ρΝ) systems (eg, In contrast to the disclosure of the invention, or the axisymmetric microstructures (others) and others, in contrast to the preferred mode of the invention, the liquid crystal medium thus oriented on the surface is used. The display mode of the present invention preferably uses one line of electric field in the composite material layer. The LCD is used for direct view display and projection display. The liquid crystal composition suitable for LCD and especially STN display has been used in the United States. It is known from M3〇s372. However, these compositions have significant disadvantages. Most of these, in addition to various defects, also have too low resistivity values and/or excessively high working dust. Can result in unfavorably long response. Therefore, the chasing needs to have a liquid crystal suitable for practical application according to the display mode used, 126111.doc 200838987, low viscosity, suitable properties Qualitative, for example, wide nematic phase range optical anisotropy An, and especially high Δ ε. [Summary] 7 people d ground' has now been found to achieve a liquid 曰曰 '丨 with a suitably high ^, suitable phase range and Δη Shell, which does not exhibit defects of the prior art materials or exhibits such defects at least to a significantly lesser extent. According to the present application, the modified liquid crystal media comprises at least the following components:

The first positive dielectric component, component A, comprises one or more of the chemical compounds and one or more compounds selected from the group consisting of 〇

F CO〇

CN HI wherein R, R and R are each independently an alkyl group having 1 to 7 c atoms, an alkoxy group 126111.doc 200838987 group, a fluorinated alkyl group or a fluoroalkyloxy group, and an alkene having 2 to 7 C atoms. a base, an alkenyloxy group, an alkoxyalkyl group or a fluoroalkenyl group, and R1 is preferably a dilute group, and m is 0 or 1, and a second positive dielectric component, component B, comprising one Or a variety of compounds of formula 1

IV where R4 has the formula given for R2 in formula II

Z4 series - C0-0• or single button,

X4 is F or OCF3 and Y4 system or F and optionally another (third) positive dielectric component, ie component C, as appropriate, dielectric neutral component, ie component D, as appropriate The electrical component, ie the component Ε, and, as the case may be, the palm component, ie component F, is preferred. Preferably, the first positive dielectric component (ie, component Α) comprises one or more strong positive 126111.doc -10- 200838987 dielectric compounds (the compounds have 20 or greater, preferably 30 or greater) The dielectric anisotropy) is preferably predominantly, more preferably substantially and particularly preferably composed entirely of one or more of the compounds of the formula I and the formula π, ΠΙ. Preferably, the liquid crystal mixture of the present invention comprises one or more compounds of the formula III wherein the melon is ruthenium and/or one or more compounds of the formula m wherein the melon is. In a preferred embodiment of the invention, the liquid daily blend according to the invention comprises one or more compounds of the formulae I, II and m. Preferably, the second positive dielectric component (ie, component B) comprises one or more positive dielectric compounds (the compounds have a relationship between 3 and 19, preferably between 5 and 16 Dielectric anisotropy), more preferably predominantly, more preferably substantially and particularly preferably consists entirely of and preferably consists of one or more compounds of the formula Iv. Preferably, the liquid crystal mixture according to the present invention comprises one or more compounds of the formula wherein X4 is OCF3 and Y4 is H. Another preferred liquid crystal mixture according to the present invention comprises one or more compounds of the formula wherein X4 is F and Y4 is F. In a preferred embodiment of the invention, the liquid crystal composition according to the invention comprises one or more compounds of the formula 1 selected from the group of compounds of the formulae IVa to IVd.

F

126111.doc -11 - 200838987

IVb IVc IVd wherein r4 has the meaning given above In one preferred embodiment of the invention one or more compounds of formula IVa are included.

Liquid crystal mixture according to the invention = in a preferred embodiment of the invention, the liquid crystal mixture according to the invention comprises one or more compounds of the formula Ivb and/or one or more compounds selected from the group of formulas ive to rain compounds. In a preferred embodiment of the invention, the second positive dielectric component (ie, knives) includes or is selected from the group consisting of the compounds of formula iv of formulas IVa to IVd, more preferably predominantly Jia is basically and especially well composed of it. Preferably, the liquid crystal mixture according to the present invention comprises another (third) positive dielectric component (i.e., component C). The composition has a dielectric anisotropy of 3 or more, preferably between 3 and 19, and most preferably between 5 and 15. Preferably, it comprises a positively dielectric compound, preferably predominantly, preferably substantially and particularly preferably 126111, doc • 12· 200838987. Preferably, the component comprises _ or a plurality of ruthenium compounds. Better, mainly, substantially, and preferably fully composed of

Has the meaning given to R2 in Formula II above

Independent of each other and at

Appear twice, and the ones are independent of each other

At least one of 126111.doc -13- 200838987 or separately

Independent of each other, and appearing twice in z51, and these are independent of each other as _CH2CH2·, -coo·, trans--CH=CH-, trans...CF=CF-, -CH2〇-, -Cf2〇_ Or one-touch

Preferably, at least one of the ones is a single bond and is optimal (if present) of the at least two single bonds, χ5 is F, ci, haloalkyl, i alkoxy, decyl or _ Alkenyloxy, wherein the self-generation is preferably fluoro and/or gas-substituted, and preferably X5, F, cf or OCF2H, n is 0, 1 or 2, preferably 1 or 2. And the compound of the formula 1\^ to IVd is not included therein. The liquid crystal mixture according to the present invention is contained in addition to components A and B.

At least one other component. The third component can be any of components C, D & E. Preferably, the third component of the present invention is C*D, particularly preferably component C. It will be apparent that the mixture according to the invention may also comprise the four components, preferably components A, B, c and hydrazine, and optionally all four components. Preferably, the liquid crystal mixture according to the invention comprises a dielectric neutral component, component D. This component has a dielectric anisotropy between 丨.5 and +3. Preferably, it comprises one or more dielectric neutral compounds, more preferably it is more "substantially and especially preferably composed entirely of. Preferably, the component package 1261Il.doc -14-200838987 comprises one or more The medium-sized compound of the formula νι is preferably better composed of it, mainly better and basic.

R61 and R62,

Independent of each other, with the meaning given in the above formula I for R2,

Appear twice, and the ones are independent of each other

In the case of 126111.doc -15- 200838987

At least one, better two or more

Z and Z62 are independent of each other and appear twice in Z61, and these are independently -CH2CH2-, _CO〇-, trans__CH=CH-, trans...CF=CF-, -CH2〇-, - 〇Ch2_, _CF2〇-,

- 〇C〇2_ or a single bond, preferably at least one of the single bonds and preferably (if present) the at least two single bonds and

I is 0, 1 or 2. In a preferred embodiment of the invention, the liquid crystal mixture according to the invention is selected from the group consisting of compounds of the formula Va to Vf.

126111.doc -16 - 200838987 53 51

Wherein R 5 X 5 is an alkyl group having 1 to 7 C atoms, an alkoxy group, a hydroxyalkyl group or a fluoroalkoxy group, a dilute group having 2 to 7 c atoms, an alkenyloxy group, an alkoxyalkyl group or Fluorocarbon, independently of each other, F, C1 or a fluoroalkyl or fluoroalkyloxy group each having 1 to 4 c atoms or a fluoroalkenyl or fluoroolefin each having 2 to 4 C atoms Oxygen, preferably ρ, 〇CF3 or 〇CF2H, L51 to L56 are each independently or F, preferably at least one, preferably L, more preferably (preferably selected from B, [52] And l53) 126111.doc -17- 200838987 Two or more are F. More preferably, one or more selected from the group consisting of Formulas Va-1 to Va-4, Vb-1 to Vb-15, Vc-1 to Vc-4, Vd_l to Vd-8, Ve-1 to Ve-4, Vf Liquid crystal mixture of compounds of groups -1 to Vf-4 and Vg-1 to Vg-4, R--COO-

-OCF 3

Va-1

Coo-

F

OCF

Va-2 3 R-

C〇〇

F

OCF,

Va-3 ρ Ρ

Οοο

F

Va-4

Coo-

OCF 3

Vb-1

F

Coo-

OCF,

Vb-2 R-

F

F c〇〇-

OCF,

Vb-3 126111.doc -18 - 200838987 5

Vb-4

R

Vb-5

Vb-6

Vb-7

Vb-8

Vb-9

Vb-10

Vb-11 126111.doc -19- 200838987

Vb-12

Vb-13

Vb-14

Vb-15

Vc-1

Vc-2

Vc-3

Vc-4 126111.doc -20- 200838987

F

F

F

Vd-1

Vd-2

Vd-3

Vd-4

Vd-5

Vd-6

Vd-7

Vd-8 126111.doc -21 - 2200838987

3

Vf-1

Vf-2

Vf - 3

Vf-4 126111.doc -22- 200838987

Vg-l

Vg-2

Vg-3

Vg-4 R is an alkyl group having 1 to 7 C atoms, an alkoxy group, or a fluorinated group.

An alkyl group or a fluoroalkoxy group, an alkenyl group having 2 to 7 C atoms, an alkenyloxy group, an alkoxyalkyl group or a fluoroalkenyl group. In a preferred embodiment of the invention, the liquid crystal mixture according to the invention comprises one or more compounds of the formula Vf-4. In another preferred embodiment of the present invention, which may be the same as the previous embodiment or a different embodiment, the liquid crystal mixture according to the present invention comprises component D, and component D comprises selected from the group consisting of Formulas VIa to Vlh. Preferably, a compound of the formula ... preferably selected from the group consisting of VIa and VIg compounds, preferably predominantly and optimally consisting entirely of it, 126111.doc -23- 200838987

Via ;61-〇Or,

VIb

Vic VId

Vie

Vlf

R and R are each independently an alkyl group, an alkoxy group, a fluoroalkyl group or a fluoroalkoxy group having 1 to 7 C atoms, and have 2 to 7

Alkenyl group of c atom, olefin A A tert-butyl group, alkoxyalkyl group or fluoroalkyl group and 126111.doc -24- 200838987 L6 is H or F. In a preferred embodiment of the invention, the liquid crystal mixture according to the invention comprises one or more compounds of the formula VIg. The liquid crystal mixture comprises one or more compounds selected from the group consisting of compounds of formula VIa wherein R61 and R62 are alkyl groups, compounds of formula Via, wherein R6 is alkyl and R62 is alkoxy,

A compound of the formula VIa, wherein R61 is alkyl and R62 is alkenyl, a compound of the formula VIb, wherein R6i and R62 are alkyl, a compound of the formula VIb, wherein r6i is alkyl and r62 is alkoxy, a compound of the formula Vic, wherein r6i R62 is an alkyl group, a compound of the formula VIc, wherein R61 is an alkyl group and R62 is an alkoxy group, a compound of the formula Vic, wherein r6i is an alkyl group and the r62 is an alkenyl group and a compound of the formula VId, wherein R61 and R62 are alkyl groups. Preferably, the liquid crystal mixture comprises one or more compounds of the formula VIa in addition to one or more compounds selected from the group of formulae VIb to VId and VIg, and more preferably a mixture comprising a compound of the formula Via, wherein the r6i is an alkyl group and the r62 olefin base. Further, the liquid crystal mixture according to the present invention may comprise another optional component, component E, which has a negative dielectric anisotropy and comprises a negative dielectric compound preferably of formula VII, preferably predominantly and preferably. Basically and optimally composed entirely of

Which independently of each other has the above formula I given for Ri 126111.doc -25- 200838987

meaning,

Better

Z71 and z72 L71 and L72 k

Independent of each other -CH2CH2·, -COO-, trans--CH=CH-, trans...CF=CF-, _CH2〇-, -CF20_ or a single bond, preferably at least one of which is a single bond and Preferably, both are single bonds, independently of each other, CF or N, preferably at least one of which is CF and optimally both of which are cF and system 0 or 1. It is well known to the skilled person that the antagonistic component of the palm component can be used as the palm component (i.e., component F). These compounds are known to be palmitic dopants such as, for example, cholesteryl citrate (CN) C15 or 126111.doc • 26-200838987 CB15 (which is commercially available from Merck KGaA). Also useful are the following pairs: R-811AS-811 > R-lOll^S-lOH^R.50!^ s_5〇ii, these are paired enantiomer compounds, and these can also be said From Merck KGaA. The latter allows the desired twist of the cholesterol helix to be selected by using the appropriate enantiomer of the compound. Preferably, the liquid-crystalline medium according to the present invention comprises a compound of the group VIII to 1 and specifically selected from the group of compounds of the formulae I to VII, the content of which is mainly and optimally composed entirely of.

Included in the present application, in the context of a composition, means that the indicated entity (eg, medium or component) is preferably 1 G% or more and preferably contains more or more of the component(s) in question or (etc.) a compound. & In this context, consisting primarily of ... means that the indicated entity contains "% or more, preferably, / or more and optimally 7 % or more of the group of injuries discussed or the Compound. In this context, 'substantially composed of" means that the indicated entity contains rib% or more, preferably 90% or more, and most preferably 95% or more of the component(s) discussed or The compound (hereinafter) is composed of 98% 戋 more, preferably 99% or more and preferably 1% of the group referred to in the following. Or a compound of the present invention. Particularly preferred is a liquid crystal medium in which component A comprises a group selected from the group of leg compounds, preferably predominantly and optimally composed entirely of liquid crystal medium. Included in the composition of one or more compounds of formula VI1, preferably selected from the group of formulae to the compound, preferably consisting predominantly and optimally consisting entirely of 126Ill.doc -27. 200838987

Vila

Vllb

Vile

Wherein R71 and R72 have the corresponding meanings given above for formula VII. In the formula, R" is preferably n-alkyl or alkenyl and R72 is preferably n-alkyl or alkoxy. Other liquid crystal-derived compounds not specifically mentioned above may also be used as appropriate and advantageously In the medium of the present invention, such compounds are well known to those skilled in the art. Component A is preferably from 40 to 90%, more preferably from 50 to 80%, still more preferably from 55 to 70%, and most preferably 60% of all mixtures. It is used at a concentration of 65%. Component B is preferably used in a concentration of 5 to 50%, more preferably 7 to 40%, more preferably 10 to 30%, and most preferably 15 to 25% of all the mixture. Preferably, the mixture is used in a concentration of 40%, more preferably 2 to 30%, more preferably 3 to 20%, and most preferably 5 to 15% of the mixture. Component 10 is preferably used in all mixtures from 40% to 40%. It is preferably used at a concentration of 20% and preferably 5 to 15%. Component E is preferably from 30%, preferably from 20% to 126111.doc -28 - 200838987 5 to 15% of all mixtures. The concentration of component F is preferably used in a concentration of from 〇 to 1%, preferably from 5% to 5%, and most preferably from 5% to 2% of all mixtures. The medium of the invention may optionally include other liquid crystal compounds to modulate the physics. nature. Such compounds are well known to those skilled in the art. Such concentrations in the medium of the present invention are preferably from 〇% to 3%, more preferably from 至% to 2%, and most preferably from 5% to 15%. 'The liquid crystal medium comprises from 5% to 1%, more preferably 100% and most preferably from 80% to 10,000% and especially from 90% to 10,000% of all components a, BC, D, E and F (preferably components a, B, C, D and F), which in turn comprise one or more of formulas I, II, m (component A), IV (component B), V (component C) The compound of VI (component D) and VII (component E) preferably consists mainly and optimally. The liquid crystal medium according to the invention is preferably characterized by a transparent point of 7 〇 t: or higher. Preferably, it is 75 ° C or higher, more preferably 80 ° C or higher and especially 85. (: or higher. The Δη of the liquid crystal medium of the present invention is preferably 〇·11 or larger, more preferably 〇.丨2 Or larger, more preferably between 0.120 and 0.200, more preferably between 〇12〇 and 〇18〇, optimally between 0_120 and 0.126 and especially between 〇12〇 and 〇15〇. The Δε of the liquid crystal medium according to the present invention at 1 kHz and 20 ° C is preferably 25.0 or more, more preferably 35.0. Or larger, more preferably 45 or more, most preferably 55 Å or more and especially 65.0 or more. The nematic phase of the medium of the present invention is preferably at least self-tanning. 〇 extends to 7 〇〇 c, preferably 126111. Doc -29- 200838987 at least from -20 ° C to 70 ° C, optimally at least from -30 ° C to 75 ° C and especially at least from -40 ° C to 80 ° C, where "at least, combined with the lower limit The phase temperature range extends at least downwardly to a lower limit and preferably to a lower temperature, and the upper limit means that the phase temperature range extends at least upwardly to an upper limit and preferably to a temperature above the upper limit. The liquid crystal medium according to the present invention preferably has οι! or greater, more preferably 0.12 or greater, more preferably from mo to 0.200, more preferably between 0.120 and 0.180, and most preferably in the STN unit. A threshold voltage (乂1〇) between 2626 and especially between 0.120 and 0.150. In the present application, the term positive dielectric refers to a compound or component of Δε > 3.0, a dielectric neutral-1,5SAM3.0 and a negatively dielectric compound or component. The Δε system was measured at 1 kHz and 20 °C. The dielectric anisotropy of the compound is determined based on the results of 1% by weight of the individual compound solution in the nematic host mixture. The capacitance of the test mixtures was determined in two units with vertical and uniform alignment. The cell gap of the two types of cells is about 1 micrometer. The applied voltage is a rectangular wave with a frequency of 1 kHz and the rms value is typically 〇·5 volts to 1.0 volts, however it is always chosen to be lower than the capacitance threshold of the corresponding test mixture. The mixture ZLI-4792 and the mixture ZLI-3086 (both purchased from Merck KGaA, Germany) were used as the host mixture for the positive dielectric compound and the dielectric neutral and negative dielectric compounds, respectively. The permittivity of the compounds is determined and extrapolated to the 100% concentration of the compound of interest based on the change in the corresponding value of the host mixture after the addition of the compound of interest. The components having the nematic phase at the measurement temperature of 20 ° C were measured as in the case of the compound 126111.doc -30-200838987. The U.S. day and month do indicate that otherwise the following two terms refer to: the term threshold voltage in the present v/month, in the middle refers to the optical threshold and provides a relative contrast ratio of 1 〇% (V, H j The term saturation voltage refers to the optical saturation value and is provided for a relative contrast ratio (V9 〇) of 9〇%. The capacitance threshold voltage (Vq, also known as eedencksz-premium u) is used only when explicitly mentioned. Unless otherwise expressly stated, the scope of the parameters given in this application note includes the limits. & additionally, otherwise, all concentrations in this application are given in mass percent and refer to the corresponding total mixture. All temperatures are given in degrees centigrade (~... still) and all temperature differences are given in degrees Celsius. All physical properties are already based on "Merck Li_d"

Crystals, Physical Properties of Liquid Crystals11, Status

Nov. 1997' Merck KGaA, Germany, and unless otherwise explicitly stated, is given at a temperature of 2η:. The optical anisotropy (Δη) was measured at a wavelength of 589·3 nm. The dielectric anisotropy (Δ 系 is at the frequency) is determined. The threshold voltage and other photo-electricity f have been determined using a test unit prepared by quenching KGaA (Germany). The test unit used for the measurement & Cell gap. The electrode is a round germanium electrode with a surface area of 113 cm 2 and a guard ring. The oriented layer is used for vertical orientation & 卵 lecithin and from Japan Synthetic Rubber for uniform orientation (ει) Yttrium imine AL-1054. The capacitance is measured using a frequency response analyzer s〇i price (10) 1260 using a sine wave of 0·3 Vrms voltage. The light used in electro-optic measurement is white light. The device used was a device sold by Otsuka (Japan). Characteristic voltage 126111.doc -31 · 200838987 It has been measured under vertical observation. The threshold (Vl〇)·intermediate gray scale (V5〇)- and saturation (V9〇) voltages were measured for i〇Q/❶, 5〇%, and 卯% relative contrast ratio, respectively. The liquid crystal medium according to the present invention may contain other additives and a dopant for a conventional concentration in a conventional concentration. The total concentration of other components, such as the total mixture, is between 〇 / 〇 to 10 / 〇, preferably 〇 · i % to 6%. The concentration of each of the individual compounds used is preferably between 0.1% and 3%. The concentrations of these and similar additives in this application are not included in the concentration and range of the liquid crystal components and compounds of the liquid crystal medium. The liquid crystal medium according to the invention described herein consists of several compounds, preferably 3 to chuan, more preferably 8 to 20 and most preferably 1 to 16 compounds. The compounds are mixed in a conventional manner. Generally, the amount required to use the compound in a smaller amount is dissolved in the compound used in a larger amount. In the case where the temperature is higher than the clearing point of the compound used at a higher concentration, the completion of the dissolution process is particularly easy to observe. However, it is also possible to prepare such capsules by other conventional methods, for example using so-called premixes which may be homologous or co-refined mixtures of, for example, compounds, or using so-called multi-bottle systems, which are themselves ready-to-use. mixture. The liquid crystal medium according to the present invention can be modified in this manner by adding suitable additives so that it can be used in any liquid crystal display of any of the known types such as ΤΝ-, TN-AMD, ECB-AMD, VAN·AMD, IPS and OCB LCD), and in particular for composite systems (eg PDLC, NCAP, PN LCD) and especially for ASM-PA LCD. The melting point T (C, N) of the liquid crystals, the transition T(S, N) from the layer (S) to the nematic (N) phase, and the transparent point T (N, I) are given in degrees Celsius. 126111.doc -32- 200838987 In the present application and especially in the following examples, the structures of the liquid crystal compounds are represented by abbreviations (also referred to as acronyms). The abbreviations can be simply converted into corresponding structures according to the following two tables A and B. All of the groups CnH2n+1 and CmH2m+i are linear alkyl groups having n&m C atoms, respectively. The explanation in Table B is self-evident. Table A lists only the abbreviations of the structural core. The individual compounds are represented by the core abbreviation followed by the hyphen and the designation codes for the substituents R1, R2, L1 and L2 as follows:

Rl, R2, U L2 code Rl R2 Ll L2 nm CnH2n+l CmH2m+l HH nom CnH2n+l OCmH2m+l HH nO.m 〇CnH2n+l CnJHbm+l HH n CnH2n+l CN HH nN.F CnH2n+ l CN HF nN.FF CnH2n+l CN FF nF CnH2n+l FHH nF.F CnH2n+l FHF nF.FF CnH2n+l FFF nOF OCBH2n+i FHH nCl CnH2n+l Cl HH nCLF CnH2n+l Cl HF nCLF.F CnH2n+l Cl FF Ncf3 CnH2n+l cf3 HH nCF3.F Cntfcn+l cf3 HF nCFs.FF CnH2n+l cf3 FF nOCF3 CnH2n+l OCF3 HH nOCF3.F CnH2n+l OCF3 HF nOCF3.FF CnH2n+l OCF3 FF nOCF2 CnH2n+l OCHF2 HH nOCF2.F CnH2n+l OCHF2 HF nOCF2.FF CnH2n+l OCHF2 FF nS CnHln+l NCS HH nS.F CnH2n+l NCS HF nS.FF CnH2n+l NCS FF rVsN CrH2rH-CH=CH- CsH2s- CN HH rEsN CrH2r+l-〇-CsH2s- CN HH nAm CnH2n+l COOCmH2m+i HH 126111.doc -33 - 200838987 Table A:

R"

EPCH

R1

R2

CCH

126111.doc -34- 200838987

COO

R"

〇>-C〇〇

ME

HP

COO—( O >-R

COO

CP

CH

R -^^CH2CH2—

COO—( O )-R

EHP Table B: CH. I c2h5-ch-ch2~( o CB15

0 KCN CH. I 3

C2h5-ch-ch2-o-\ O )~( O >-CN C15

CnH2l n+1

^n^2n+1

CGP-n-X (X=F, Cl, OCF3)

CGG-n.FX (X=F, Cl, OCF3) F F CnH2n+1

CGU-n-X (X=F, Cl, OCF3)

GP-n-X (X=F? Cl5 OCF3)

CnH 2n+1

CCGU-n-X (X=F, Cl, OCF3) 126111.doc -35- 200838987

Inm 0 )—〇 /" CmH2m+1

F

CmH 2m+1

CnH2n+1 C2H4-<2M2 ECBC-nm

cnH2n+1-\ >-<>-c〇-CK 〇CCPC-nm

CnH: 2n+1

2m+1 CPCC-ii-m

C2H5—(^y~C〇0—( 〇 >""( 〇 >-CN

CHE

H2C = CH

CnH2n+1

CC-n-V

CnH2n+i

CmH2m+1 CC-n-Vm

CnH2o+1 ~<^)^(CH2)m-CH=CH2

CC-n-mV -36- 126111.doc 200838987

CCP-V-m

CnH2n+1 —/

CCP-nV-m

CDU-n-X PGU-n-X (X=F, Cl, OCF3) (X=F, Cl, OCF3)

F

CnH2n+1 y^\^y—~CO-Q—

F

CCZU-n-X (X=F, Cl, OCF3)

F

Ch2=ch —^< o co-0~〈〇&gt;^CN

F

PZU-V-N 1261II.doc 37- 200838987

CH2=CH-(CH2)n-^^ca

PZU-Vn-N

CnH2n+1-CH=CHH〇KCO,

PZU-nV-N The liquid-crystalline medium according to the present invention preferably comprises seven or more, preferably eight or more compounds selected from the group of the compounds of Tables A and B, and/or one or More, more preferably two or more, preferably three or more compounds selected from the group of compounds of Table A, preferably different formulas and/or three or more, more preferably four or more Compounds, more preferably five or more compounds selected from the group of compounds of Table B, are preferably different. In the table below, Table C, an example of a palmitic compound for a palmitic dopant is generally not found in the liquid crystal medium of the present invention. ,

Table C

C2 H 5-C H-C Η 20 ch3 C15

CB15 c2h5-ch-ch2—&lt; 0 CH. 126111.doc -38 - 200838987

H〇 ( ο, —^ / \ .0 〇-Λ 〇

〇-CH-CcH CH, R/S-811

Ch2-ch-c2h5 I ChU CM 44

C8h17o

Ί3 126111.doc -39- 200838987

F F

In the table below, Table D, there are shown examples of compounds which are generally used as stabilizers in the liquid crystal medium according to the present invention.

Table D

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126111.doc -43- 200838987 [Embodiment] EXAMPLES The following examples are given to illustrate the invention and are not intended to limit it in any way. However, it is a matter for the professional to explain the physical properties of the composition that can be achieved and whose scope can be modified. In particular, it is therefore sufficient for a professional to define a combination of properties that can be better achieved. Example 1 • A liquid crystal mixture having the composition and properties given in the table below. Composition physical properties compound chat) =82 °C No. Abbreviation concentration /% 1 PZU-V2-N 13.0 Δη (20°C, 589.3 nm) =0.1461 2 ME-2N.F 9.0 3 ME-3N.F 9.0 △ ε (20〇C, 1 kHz) =67.7 4 ME-4N.F 12.0 5 ME-5N.F 12.0 Twist = 240 Ο 6 HP-3N.F 4.0 Frequency = 80 Hz 7 HP-4N.F 3.0 Vio = 0.75 volts 8 CCP-30CF3.F 2.0 V90/V10 =1.178 9 CCP-3F.FF 4.0 10 CCP-5F.FF 4.0 11 CDU-3-F 4.0 12 CDU-5-F 4.0 13 CCGU-3-F 10.0 14 CCPC-33 4,0 15 CCPC-34 3.0 16 CCPC-35 3.0 Σ 100.0

This mixture has a favorable Δη value and a high Δε value and is very suitable for displays operating in STN mode. 126111.doc -44- 200838987 Example 2 A liquid crystal mixture having the compositions and properties given in the table below was implemented. Composition|physical properties compound&quot;&quot;&quot;丨 abbreviation 2 4 6 7 8 9 0 12 3 4 1X 11 11 IX 11 Σ PZU-2V-N PCH-3N.FF ME-2N.F ME-3N.F ME-4N.F HP-3N.F HP-4N.F HP-5N.F CDU-3-F CCZU- 2-F CCZU- 3-F CCZU- 5-F CCGU-3-F CCPC-34 CCPC- 35 Concentration /% 5^0~ 14.0 9.0 9.0 11.0 5.0 5.0 5.0 4.0 5.0 10.0 5.0 6.0 3.0 3.0 100.0 Chat) =77 °C △n(20°C, 589.3 nm) =0.1294 Δε (20°C?lkHz) =43.9 Twist = 240 〇 Frequency = 80 Hz v10 = 0.76 V V90/V10 =1.147

The mixture has advantageous Δη values and high Δε values and is well suited for displays operating in STN mode. 126111.doc 45-

Claims (1)

200838987 X. Patent Application Range: 1. A liquid crystal medium characterized in that it comprises a first positive dielectric component, component A, comprising one or more formulas and one or more selected from the group consisting of Π and m Group of compounds III where mR is, independently of each other, an alkyl group having 1 to 7 carbon atoms, an alkoxy group, a fluoroalkyl group or a fluoroalkoxy group, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group, an alkoxyalkyl group. a fluoro or alkenyl group and m system 0 or 1, and a first positive dielectric component, component B, comprising one or more compounds of formula IV 126111.doc 200838987 where R4 has the meaning given to R2 in the formula π, Z4 is a -co-o_ or a single bond, X4 is F or OCF3 and Y4 system or F. A liquid crystal medium according to claim 1, which is characterized in that it comprises a positive dielectric component A comprising one or more compounds of the formula wherein R is an alkenyl group. 3. A liquid crystal medium according to any one of claims 1 and 2, characterized in that it comprises a third positive dielectric component 'i.e. component C'. The component comprises one or more as given in the text of the specification Compound of formula V. 4. A liquid crystal medium according to any one of claims 1 and 2, characterized in that it comprises a dielectric neutral component, i.e. component D, the composition comprising one or more of formula VI as given in the text of the specification Compound. 5. A liquid-crystalline medium according to any one of claims 1 and 2, characterized in that it comprises a negative dielectric component, i.e. a component enthalpy, the component comprising one or more of formula VII as given in the text of the specification Compound. 6. A liquid-crystalline medium according to any one of claims 1 and 2, characterized in that it comprises one or more formulas selected from the group consisting of the compounds of the formulae IVa to IVd, 126111.doc 200838987 F IVa IVb F IVc IVd • The liquid crystal medium of one of the four items 1夂2, Yiyi+, /, is specially characterized by its formula or the compound of the formula III given in claim 1. A liquid crystal display H characterized by comprising a liquid crystal medium according to one of the claims (1). 9. The liquid crystal display of claim 8, characterized in that it is an STN display. 10. Use of a liquid crystal medium according to one of claims 1 to 7 in a liquid crystal display. 126111.doc 200838987 VII. Designated representative map: (1) The representative representative of the case is: (none) (2) The symbolic symbol of the representative figure is simple: 8. If there is a chemical formula in this case, please reveal the best indication of the characteristics of the invention. Chemical formula: F COO-CN I F 126111.doc -6-