CN104513666A - Liquid crystal medium and application - Google Patents

Liquid crystal medium and application Download PDF

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Publication number
CN104513666A
CN104513666A CN201510013788.4A CN201510013788A CN104513666A CN 104513666 A CN104513666 A CN 104513666A CN 201510013788 A CN201510013788 A CN 201510013788A CN 104513666 A CN104513666 A CN 104513666A
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liquid crystal
group
crystal media
represent
independently
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CN104513666B (en
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高红茹
温刚
丰景义
翟媛媛
孙轩非
贾鹏忠
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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Shijiazhuang Chengzhi Yonghua Display Material Co Ltd
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Priority claimed from CN201410530772.6A external-priority patent/CN104263383A/en
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Abstract

The invention discloses a negative dielectric anisotropic liquid crystal medium which comprises 15 to 55 weight percent of one or more dielectric neutral compounds shown in general formulae I1 and I2, 1 to 60 weight percent of one or more negative dielectric compounds shown in general formula II and 1 to 80 weight percent of one or more negative dielectric compounds shown in general formula III. The optical anisotropy of the liquid crystal medium ranges from 0.080 to 0.150, and the liquid crystal medium has lower rotary viscometer, proper negative dielectric anisotropy and higher K value, and can be used for an active matrix display element with the liquid crystal medium, such as an active matrix display with ECB, FFS or IPS, MVA, PVA or HVA effects (referring to the Specification for the general formulae I1 and I2 as well as the general formula II).

Description

A kind of liquid crystal media and application
Technical field
The present invention relates to liquid crystal material field, relate to a kind of liquid crystal media specifically, this liquid crystal media is the liquid crystal media of negative dielectric anisotropic, the invention still further relates to this liquid crystal media at active matrix display element, as used the application in the Active Matrix Display of ECB, FFS or IPS, MVA, PVA or HVA effect.
Background technology
Current TFT-LCD has been widely used in industrial circle and household consumption field, almost instead of traditional CRT monitor market completely.According to the difference of liquid-crystal display mode, liquid crystal display device can be divided into the various modes such as twisted nematic (TN) pattern, super-twist nematic (STN) pattern, coplanar (IPS) pattern, vertical orientation (VA) pattern.
Current liquid crystal display device mostly is twisted nematic (TN) pattern, but contrast gradient is low, angle of visibility is narrow shortcoming that it exists, and the display of vertical orientation (VA) pattern is with its wide angle of visibility, high-contrast and need not the advantage such as friction matching, be used widely, and become the common display format of large size TV TFT-LCD, in addition, the wavelength dependence degree of contrast gradient to the degree of birefringence of liquid crystal, the thickness of liquid crystal layer and incident light of VA pattern display is less, therefore, VA pattern becomes the lcd technology having now prospect.
For the liquid crystal material that the display mode of VA pattern etc. is used, require low voltage drive, fast response, wide temperature range and good low-temperature stability.In other words, negative dielectric anisotropic absolute value is large, the compound of low-viscosity, large K33 value and high clearing point also just to require us to develop.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of negative dielectric anisotropy liquid crystal medium, the optical anisotropy of this liquid crystal media in 0.080 ~ 0.150 scope, and has low rotary viscosity, faster time of response and suitable negative dielectric anisotropic.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The invention provides a kind of liquid crystal media, it is characterized in that, described liquid crystal media comprises one or more dielectric neutral compounds shown in formula I 1 and one or more dielectric neutral compounds shown in formula I 2
With the dielectric negativity compound shown in one or more general formulas II
Wherein,
H is expressed as cyclopentyl or cyclobutyl;
R 1-R 5represent independently of one another 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 1, Z 2represent singly-bound ,-CH independently of one another 2-,-CH 2cH 2-,-CH 2o-or-OCH 2-in any one;
In various-(O) may be the same or different, represent independently of one another singly-bound or-O-(bracket O represents not essential, when without time be singly-bound);
represent the arbitrary group in singly-bound or following groups independently of one another:
N, m represent 0 or 1 independently of one another.
Owing to have employed technique scheme, the technical progress acquired by the present invention is:
The invention discloses a kind of negative dielectric anisotropy liquid crystal medium, this liquid crystal media excellent performance, optical anisotropy is in 0.080 ~ 0.150 scope, and there is low rotary viscosity, faster time of response, suitable negative dielectric anisotropic, high clearing point and good Low-Temperature Reliability, be highly suitable for the liquid crystal display device manufacturing VA pattern, be particularly suitable for active matrix display element, as used the Active Matrix Display of ECB, FFS or IPS, MVA, PVA or HVA effect.
Compound shown in general formula II provided by the invention, owing to introducing (cyclobutyl) or (cyclopentyl) substituting group, not only increase there is polarity negativity general formula II shown in the mutual solubility of liquid crystalline cpd in liquid crystal media, also improve its clearing point and K33 numerical value simultaneously; Thus the liquid crystal media including liquid crystalline cpd shown in general formula II is made also to have very high clearing point, large dielectric anisotropy and large K33 value.Exactly because liquid crystalline cpd has this type of advantage shown in general formula II, future will become liquid crystalline cpd needed for active matrix display element liquid crystal media.
Formula I 1 provided by the invention and the electroneutral compound of Jie shown in formula I 2, generally have less viscosity and good mutual solubility.According to actual needs, appropriate formula I 1 can be added and the every characteristic of formula I 2 compound to liquid crystal media adjusts.
Liquid crystal media provided by the present invention can also comprise the dielectric negativity compound shown in one or more general formula III
Wherein,
R 6, R 7represent independently of one another 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 1, Z 2represent singly-bound ,-CH independently of one another 2-,-CH 2cH 2-,-CH 2o-or-OCH 2-in any one;
-(O) represent singly-bound or-O-(bracket O represents not essential, when without time be singly-bound);
represent the arbitrary group in singly-bound or following groups independently of one another:
represent the arbitrary group in singly-bound or following groups:
N, m and o represent 0 or 1 independently of one another.
The electronegative compound of Jie shown in general formula III provided by the invention, end is the tilt angle that the compound of linear alkyl groups can reduce liquid crystal, to improve the black state of liquid crystal, improves contrast gradient.
Preferably, the dielectric negativity compound shown in general formula II that described liquid crystal media comprises formula I 1 that mass percentage is 15 ~ 55% and the dielectric neutral compound shown in formula I 2, mass percentage is 1 ~ 60% and mass percentage are the dielectric negativity compound shown in the general formula III of 1 ~ 80%.
As more preferably scheme, described liquid crystal media comprises the formula I 1 of weight percentage 20%-48% and the dielectric neutral compound shown in formula I 2, the dielectric negativity compound shown in general formula II of weight percentage 1 ~ 55%, the dielectric negativity compound shown in general formula III of weight percentage 2 ~ 70%.
The optical anisotropy of above liquid crystal media all can in 0.080 ~ 0.150 scope.
By selecting above-mentioned each compound, and its weight percentage is suitably adjusted, liquid crystal media can obtain different dielectric anisotropies, threshold voltage, clearing point and birefringent characteristic, and use under being convenient to thick at different liquid crystal cell in different driving voltage, the scope of application is very wide.
Described liquid crystal media provided by the present invention can also comprise the dielectric neutral compound shown in one or more general formulae IV;
Wherein,
R 8and R 9represent independently of one another 1. following ~ 3. shown in any one in group:
1. carbonatoms be 1 ~ 7 straight chained alkyl or carbonatoms be the unbranched alkoxy of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 3represent singly-bound ,-CH independently 2-,-CH 2cH 2-,-COO-or-CH 2in O-any one;
represent the arbitrary group in singly-bound or following groups independently of one another:
The gross weight percentage composition of the dielectric neutral compound shown in one or more general formulae IV described is preferably greater than 0% and is less than or equal to 10%.
Liquid crystal media provided by the present invention can also comprise one or more polymerizable compounds shown in general formula V, and the gross weight percentage composition of one or more polymerizable compounds shown in general formula V described is greater than 0% and is less than or equal to 1%;
In described formula V
be selected from least one in the phenylene of phenyl, the phenylene in methyl generation, the phenylene in dimethyl generation, the phenylene of fluoro and/or two fluoro independently of one another;
N and m represents 1 or 2 independently of one another.
The optical anisotropy of above liquid crystal media all can in 0.080 ~ 0.150 scope.
One or more preferably in the dielectric negativity compound shown in formula II a to II j of one or more dielectric negativity compounds shown in general formula II described in above-mentioned liquid crystal media
One or more preferably in the dielectric negativity compound shown in formula III a to III m of dielectric negativity compound shown in one or more general formula III described
In described II a to formula II j, III a to III m,
R 5-R 7be respectively 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
-(O) represent singly-bound or-O-(bracket O represents not essential, when without time be singly-bound);
represent the arbitrary group in singly-bound or following groups independently of one another:
According to liquid crystal media of the present invention, one or more additives following that concentration of component is 0% ~ 1% can also be comprised in addition extraly: polygenetic dye, UV stablizer, antioxidant, hand are levied to doping agent, polymerization initiators, particulate and nanoparticle.
The invention also discloses above liquid crystal media at active matrix display element, the application in the Active Matrix Display of ECB, FFS or IPS, MVA, PVA or HVA effect.
The dielectric negativity compound of the general formula II in the application of the invention, in addition optimum combination and proportion optimizing, and adopt other several even tens kinds of liquid crystalline cpds with feature to mix thus the performance perameter reached required by indicating meter in addition, have that negative dielectric anisotropic absolute value is large, the feature of low-viscosity, large K33 value and high clearing point, thus the VA pattern display liquid crystal material of excellent performance that exploitation makes new advances.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details:
Number involved in following embodiment is weight percentage, and temperature unit is DEG C, the concrete meaning of other symbols and test condition as follows:
S-N represents that the crystalline state of liquid crystal is to nematic fusing point (DEG C);
C.p. the clearing point (DEG C) of liquid crystal is represented, testing tool: the micro-thermal analyzer of Mettler-Toledo-FP System;
γ 1 is rotary viscosity (mPas), and test condition is: 25 DEG C, INSTEC:ALCT-IR1,18 microns of vertical cassette;
K 11for distortion elastic constant, K 33for opening up bent elastic constant, test condition is: 25 DEG C, INSTEC:ALCT-IR1,18 microns of vertical cassette;
△ ε represents dielectric anisotropy, △ ε=ε ∥-ε ⊥, wherein, ε ∥for being parallel to the specific inductivity of molecular axis, ε ⊥for the specific inductivity perpendicular to molecular axis, test condition: 25 DEG C, INSTEC:ALCT-IR1,18 microns of vertical cassette;
Δ n represents optical anisotropy, △ n=n o-n e, wherein, n ofor the specific refractory power of ordinary light, n efor the specific refractory power of extraordinary ray, test condition: 589nm, 25 ± 0.2 DEG C;
The following examples 1 ~ 12 take liquid crystalline cpd respectively in proportion, are prepared into liquid crystal media.The various liquid crystal monomers used all can be synthesized by known method, or are obtained by commercial sources.
Prepare liquid crystal media equipment used and instrument is:
(1) precise electronic balance (tolerance range 0.1mg)
(2) stainless steel beaker: for weighing liquid crystal
(3) spoon: for adding monomer
(4) magnetic rotor: for stirring
(5) temperature control magnetic stirrer
The preparation method of liquid crystal media comprises the following steps:
(1) monomer used is put in order neatly;
(2) stainless steel beaker is placed on balance, with little spoon, monomer is contained in stainless steel beaker;
(3) monomer liquid crystal is added by required weight successively;
(4) the stainless steel beaker adding honest material is placed on heating and melting on magnetic agitation instrument;
(5) after mixture major part is melted in stainless steel beaker, in stainless steel beaker, add a magnetic rotor, liquid crystal compound is stirred, after cool to room temperature, namely obtains liquid crystal media.
The liquid crystal media of gained is filled between liquid-crystal display two substrates and carries out performance test.The performance parameter test result of the liquid crystal media of the monomer structure of particular compound, consumption (weight percentage), gained is all listed in table.The corresponding embodiment 1 ~ 12 in table 1 ~ 12.
The component proportion of the liquid-crystal composition of table 1 embodiment 1 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 2 embodiment 2 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 3 embodiment 3 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 4 embodiment 4 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 5 embodiment 5 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 6 embodiment 6 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 7 embodiment 7 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 8 embodiment 8 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 9 embodiment 9 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 10 embodiment 10 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 11 embodiment 11 and performance perameter thereof
The component proportion of the liquid-crystal composition of table 12 embodiment 12 and performance perameter thereof
From the performance perameter of the liquid-crystal composition shown in embodiment 1 ~ embodiment 12, liquid-crystal composition of the present invention has suitable optical anisotropy, lower rotary viscosity, well low-temperature stability, larger K33 value, be highly suitable for active matrix display element, as the Active Matrix Display of ECB, FFS or IPS, MVA effect; If on the liquid-crystal composition basis shown in above-mentioned 12 embodiments, add general formula V polymerizable compound in addition, also can be used for the Active Matrix Display of PVA or HVA effect.
Although the present invention only lists particular compound and the proportioning consumption (weight percentage) thereof of above-mentioned 12 embodiments, and carried out performance test, but liquid-crystal composition of the present invention can on the basis of above-described embodiment, utilize formula I involved in the present invention, II, liquid crystalline cpd representated by III, IV and formula I, II, III, the preferred liquid crystalline cpd of IV expands further and revises, by suitably adjusting its proportioning consumption, all object of the present invention can be reached.

Claims (11)

1. a liquid crystal media, is characterized in that, described liquid crystal media comprises one or more dielectric neutral compounds shown in formula I 1 and one or more dielectric neutral compounds shown in formula I 2
With the dielectric negativity compound shown in one or more general formulas II
Wherein,
H is expressed as cyclopentyl or cyclobutyl;
R 1-R 5represent independently of one another 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 1, Z 2represent singly-bound ,-CH independently of one another 2-,-CH 2cH 2-,-CH 2o-or-OCH 2-in any one;
In various-(O) may be the same or different, and represents singly-bound or-O-independently of one another;
represent the arbitrary group in singly-bound or following groups independently of one another:
N, m represent 0 or 1 independently of one another.
2. liquid crystal media according to claim 1, is characterized in that, described liquid crystal media also comprises the dielectric negativity compound shown in one or more general formula III
Wherein,
R 6, R 7represent independently of one another 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 1, Z 2represent singly-bound ,-CH independently of one another 2-,-CH 2cH 2-,-CH 2o-or-OCH 2-in any one;
-(O) represents singly-bound or-O-;
represent the arbitrary group in singly-bound or following groups independently of one another:
represent the arbitrary group in singly-bound or following groups:
N, m and o represent 0 or 1 independently of one another.
3. liquid crystal media according to claim 2, it is characterized in that, described liquid crystal media comprises the formula I 1 of weight percentage 15 ~ 55% and the dielectric neutral compound shown in formula I 2, the dielectric negativity compound shown in general formula II of weight percentage 1 ~ 60% and the dielectric negativity compound shown in general formula III of weight percentage 1 ~ 80%.
4. liquid crystal media according to claim 3, it is characterized in that, described liquid crystal media comprises the formula I 1 of weight percentage 20%-48% and the dielectric neutral compound shown in formula I 2, the dielectric negativity compound shown in general formula II of weight percentage 1 ~ 55% and the dielectric negativity compound shown in general formula III of weight percentage 2 ~ 70%.
5. according to described liquid crystal media arbitrary in claim 1-4, it is characterized in that, described liquid crystal media also comprises the dielectric neutral compound shown in one or more general formulae IV;
Wherein,
R 8and R 9represent independently of one another 1. following ~ 3. shown in any one in group:
1. carbonatoms be 1 ~ 7 straight chained alkyl or carbonatoms be the unbranched alkoxy of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
Z 3represent singly-bound ,-CH independently 2-,-CH 2cH 2-,-COO-or-CH 2in O-any one;
represent the arbitrary group in singly-bound or following groups independently of one another:
6. liquid crystal media according to claim 5, is characterized in that, the gross weight percentage composition of the dielectric neutral compound shown in one or more general formulae IV described is greater than 0% and is less than or equal to 10%.
7. according to described liquid crystal media arbitrary in claim 1 to 6, it is characterized in that, described liquid crystal media also comprises one or more polymerizable compounds shown in general formula V, and the gross weight percentage composition of one or more polymerizable compounds shown in general formula V described is greater than 0% and is less than or equal to 1%;
In described formula V
represent at least one in the phenylene of phenyl, the phenylene in methyl generation, the phenylene in dimethyl generation, the phenylene of fluoro and/or two fluoro independently of one another;
N and m represents 1 or 2 independently of one another.
8., according to described liquid crystal media arbitrary in claim 1 to 7, it is characterized in that the optical anisotropy of described liquid crystal media is in 0.080 ~ 0.150 scope.
9. according to described liquid crystal media arbitrary in claim 2 to 7, it is characterized in that, one or more dielectric negativity compounds shown in general formula II described are one or more in the dielectric negativity compound shown in formula II a to formula II j
Dielectric negativity compound shown in one or more general formula III described is one or more in the dielectric negativity compound shown in formula III a to III m
In described II a to formula II j, III a to III m,
R 5-R 7represent independently of one another 1. following ~ 3. shown in any one in group:
1., carbonatoms is the straight chained alkyl of 1 ~ 7,
2., 1. shown in one or more-CH in group 2-by-O-,-CH=CH-CH 3or-CH=CH-replaces the group formed,
3., 1. or 2. shown in group one or more-H by-F ,-Cl ,-CH=CH 2or-CH=CH-CH 3replace the group formed;
-(O) represents singly-bound or-O-;
represent the arbitrary group in singly-bound or following groups independently of one another:
10. according to described liquid crystal media arbitrary in claim 1 to 9, it is characterized in that, described liquid crystal media comprises one or more additives following in addition: polygenetic dye, UV stablizer, antioxidant, hand are levied to doping agent, polymerization initiators, particulate and nanoparticle, and described binder component concentration is between 0%-1%.
In 11. claims 1 to 10, arbitrary described liquid crystal media is at active matrix display element, the application in the Active Matrix Display of ECB, FFS or IPS, MVA, PVA or HVA effect.
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