CN103305233B - Negative dielectric anisotropy liquid crystal composition and application thereof - Google Patents
Negative dielectric anisotropy liquid crystal composition and application thereof Download PDFInfo
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- CN103305233B CN103305233B CN201310253496.9A CN201310253496A CN103305233B CN 103305233 B CN103305233 B CN 103305233B CN 201310253496 A CN201310253496 A CN 201310253496A CN 103305233 B CN103305233 B CN 103305233B
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Abstract
The invention relates to a negative dielectric anisotropy liquid crystal composition. The liquid crystal composition has the advantages of low viscosity, high electrical resistivity, great optical anisotropy, high responding speed and excellent light stability and heat stability. The invention further relates to an application of the liquid crystal composition; the liquid crystal composition is suitable for a liquid crystal display device and is particularly suitable for an FFS (Fringe Field Switching) display, an IPS (Intrusion Prevention System) display or an MVA/PVA/PSVA (Multi-domain Vertical Alignment/Patterned Vertical Alignment/Polymer Stabilized Vertical Alignment) type VA (Vertical Alignment) display.
Description
Technical field
The present invention relates to liquid-crystal composition field, be specifically related to a kind of negative dielectric anisotropy liquid crystal composition and the application in liquid crystal indicator thereof.
Background technology
Within 1888, Austrian botanist Friedrich Reinitzer has found the first liquid crystal material M-nitro benzoic acid cholesterol (cholesteryl benzoate), be liquid crystal, that is to say that a kind of material has possessed the mobility of liquid and certain alignment characteristics of similar crystal simultaneously.M.Born(1916) and K.Lichtennecker(1926) find respectively and studied the dielectric anisotropy of liquid crystal.1932, W.Kast was divided into nematic phase the large class of positive and negative property two accordingly.Nineteen twenty-seven, V.Freedericksz and V.Zolinao find that nematic liquid crystal, under electric field (or magnetic field) effect, deformation occurs and have voltage threshold (Freederichsz transformation).This making that is found to be liquid-crystal display provides foundation.Utilize the electrooptic effect of liquid crystal, it is LCD that British scientist has been manufactured first liquid-crystal display in last century.Compare with traditional CRT, LCD not only volume is little, and thin thickness, lightweight, power consumption are less, operating voltage is low, and radiationless, flicker free directly mating with CMOS unicircuit.Because its advantage is numerous, LCD entered desktop computer Application Areas since 1998.Nearly decades, particularly the develop rapidly of information technology and the people continuous pursuit to information display mode in recent ten years, makes liquid-crystal display obtain the swiftest and the most violent development.Today, liquid-crystal display is just illustrated in face of people with colourful form, and its many products are because its excellent characteristic makes its pursuit that is just becoming fashion, and in market, processs the available commodity of hand.
According to the arrangement mode of liquid crystal molecule, often liquid-crystal display is divided into: the TN(Twisted Nematic at narrow visual angle), STN(Super Twisted Nematic), DSTN(Doublelayer Super Twisted Nematic) etc., in the liquid-crystal display at these narrow visual angles liquid-crystal composition used be situated between electropositive; The IPS(In-Plane Switching at wide visual angle), VA(Vertical Alignment), FFS(Fringe Filed Switching) etc., liquid-crystal display for wide visual angle, the liquid crystal media majority using is negative dielectric anisotropic, wherein IPS both can be used the liquid-crystal composition of negative dielectric anisotropic, also can use the liquid-crystal composition of positive dielectric anisotropy.From the type of drive of liquid crystal panel, at present modal is TFT(Thin Film Transistor) type driving, the passive drive before comparing can realize meticulousr display effect.Most liquid-crystal display, LCD TV and part mobile phone all adopt TFT to drive.The TN pattern at the multiplex narrow visual angle of liquid-crystal display, the VA at the multiplex wide visual angle of LCD TV, IPS isotype, they are commonly referred to as TFT-LCD.
Liquid-crystal display of the prior art exists the slow shortcoming of response speed, and the time of response is mainly subject to the viscosity influence of thickness of liquid crystal layer and liquid crystal, reduces viscosity extremely important for the time of response of improving liquid-crystal display.
In addition, mainly use at present TN pattern in liquid-crystal display, this nematic pattern exists the defect of contrast gradient view angle dependency; VA pattern (vertical alignment mode) indicating meter has wider visual angle, and the liquid crystal media using is negative dielectric anisotropy liquid crystal composition.
Summary of the invention
(1) technical problem that will solve
For problems of the prior art, the object of this invention is to provide a kind of negative dielectric anisotropy liquid crystal composition, it has low viscosity, high resistivity and larger optical anisotropy, and thereby possess fast-response speed and excellent light stability and thermostability, be applicable to the liquid crystal indicator of fast-response.
Another object of the present invention is to provide the application of a kind of described negative dielectric anisotropy liquid crystal composition in liquid crystal indicator.
(2) technical scheme
To achieve these goals, the invention provides a kind of negative dielectric anisotropy liquid crystal composition, comprise the component of following weight per-cent:
The compound of (1) 10～70% formula I representative;
The compound of (2) 5～89% general formula II representatives;
The compound of (3) 1～25% general formula III representatives;
The compound of (4) 0～20% general formula I V representatives;
Wherein, the compound structure of described formula I, II, III, IV representative is as follows:
In formula, R
1and R
2independently selected from C
1～C
12alkyl or C
1～C
12alkoxyl group, R
3and R
4independently selected from C
1～C
12alkyl or C
1～C
12alkoxyl group or C
2～C
12thiazolinyl, R
5～R
8independently selected from C
1～C
12alkyl; L
1～L
3independently selected from F atom or H atom, wherein L
1and L
2when different, it is H atom; N=0 or 1.
Preferably, negative dielectric anisotropy liquid crystal composition of the present invention comprises the component of following weight per-cent:
The compound of (1) 50～65% formula I representative;
The compound of (2) 15～35% general formula II representatives;
The compound of (3) 5～25% general formula III representatives;
The compound of (4) 0～15% general formula I V representatives.
Wherein, preferably, in the compound of described general formula I representative, R
1be selected from C
1～C
5alkyl, R
2be selected from C
1～C
5alkoxyl group.
More preferably, the compound of formula I representative is one or more in formula IA-1～formula IA-12 representative compound.
Wherein, preferably, the compound of described general formula I I representative is selected from one or more in formula IIA～formula IID representative compound:
In formula IIA～formula IIC, R
3be selected from C
1～C
5alkyl, R in formula IID
3be selected from C
1～C
5alkyl or C
2～C
5thiazolinyl; R in formula IIA
4be selected from C
2～C
5thiazolinyl, R in formula IIB and formula IID
4be selected from C
1～C
5alkyl, R in formula IIC
4be selected from C
1～C
5alkoxyl group.
More preferably, the compound of general formula I I representative is one or more in formula IIA-1～formula IIA-4, formula IIB-1～formula IIB-10, formula IIC-1～formula IIC-16, formula IID-1～formula IID-17 representative compound.
Wherein, preferably, the compound of described general formula III representative is one or more in formula III A or formula III B representative compound:
In formula, R
5and R
6independently selected from C
1～C
5alkyl.
More preferably, the compound of general formula III representative is one or more in formula III A-1～formula III A-16, formula III B-1～formula III B-16 representative compound.
Wherein, preferably, the compound of described general formula I V representative is selected from one or more in formula IVA or formula IVB representative compound:
In formula, R
7and R
8independently selected from C
1～C
5alkyl.
More preferably, the compound of general formula I V representative is one or more in formula IVA-1～formula IVA-10, formula IVB-1～formula IVB-16 representative compound.
The invention provides the application of a kind of described negative dielectric anisotropy liquid crystal composition in liquid crystal indicator, especially the application in the VA escope of FFS indicating meter, IPS indicating meter or MVA/PVA/PSVA configuration.
In the component of negative dielectric anisotropy liquid crystal composition of the present invention:
2 of general formula I representative, 3-difluorophenyl compounds has stronger negative dielectric anisotropic, excellent performance.
Two ring structure compounds of general formula I I representative are non-polar component, are disclosed in the early time in US Patent No. 4565425.This compounds is remarkable for the viscosity, the effect of raising response speed that reduce system, is the allotment requisite compounds of liquid crystal compound of response fast, and the major defect of existence is that clearing point is too low.
The compound of the compound of general formula III representative and general formula I V representative is non-polar compound, has large optical anisotropy and high clearing point, can effectively promote the clearing point of system.
Conventionally, in negative dielectric anisotropy liquid crystal composition formula of the prior art, also comprise except multiple other compounds this four compounds, complicated components, the performances such as its negative dielectric anisotropic, response speed are also good not.In liquid-crystal composition of the present invention, only use described four compounds, and increased the wherein weight percent of I class and II compounds, thereby effectively reduced the viscosity of composition, improved response speed, made composition there is stronger negative dielectric anisotropic simultaneously.
The preparation method of negative dielectric anisotropy liquid crystal composition of the present invention is without particular restriction, can adopt ordinary method that two or more compound are produced, as prepared by the method for at high temperature mixing different components and dissolve each other, wherein, liquid-crystal composition is dissolved in to solvent the mixing for this compound, then under reduced pressure distills out this solvent; Or negative dielectric anisotropy liquid crystal composition of the present invention can be according to conventional method preparation, as the component that wherein content is less is dissolved in the main ingredient that content is larger at higher temperature, or component under each is dissolved in organic solvent, as acetone, chloroform or methyl alcohol etc., then will after solution mixing removal solvent, obtain.
(3) beneficial effect
Negative dielectric anisotropy liquid crystal composition of the present invention has low viscosity, high resistivity, good low temperature mutual solubility and fast response speed, can be used for the fast-response liquid crystal indicator of plurality of display modes.Negative dielectric anisotropic liquid crystal compound all has higher viscosity conventionally, and when being mixed into liquid crystal material, its low-temperature performance all exists certain problem simultaneously.Negative dielectric anisotropy liquid crystal composition of the present invention has overcome these problems, has low viscosity and good low-temperature performance, and its use in VA, IPS or FFS mode display can obviously improve the poor problem of visual angle of liquid crystal display.
Embodiment
Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
In the embodiment of the present invention, the preparation of liquid-crystal composition is all adopted with the following method:
Evenly the preparation of liquid crystal adopts the heat of solution method of generally using in the industry, first with balance, weigh by weight percentage liquid crystalline cpd, wherein weigh addition sequence without particular requirement, conventionally with liquid crystalline cpd fusing point order from high to low, weigh successively mixing, at 60～100 ℃, heated and stirred melts evenly each component, again after filtration, revolve steaming, finally encapsulate and obtain target sample.
Except as otherwise noted, in context, per-cent is weight percentage, and all temperature are degree Celsius to provide.Use following abbreviation:
△ n is optical anisotropy, Δ ε be dielectric constant anisotropy (20 ℃, 1000Hz);
V
10for threshold voltage, be the character voltage (V, 20 ℃) when relative 10% transmitance, η is volume viscosity (mm
2/ s, 20 ℃), the clearing point that C.p is liquid-crystal composition (℃).
Except as otherwise noted, all optical datas are all measured at 20 ℃.
Embodiment 1
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 1.1 and table 1.2:
The weight percent of each component in the liquid-crystal composition of table 1.1 embodiment 1
| Component | Weight percent (%) |
| IA-2 | 20 |
| IA-4 | 20 |
| IA-10 | 15 |
| IIA-1 | 10 |
| IID-1 | 7 |
| IID-2 | 10 |
| IIIA-13 | 5 |
| IIIA-14 | 4 |
| IVA-5 | 5 |
| IVB-6 | 4 |
The performance perameter of the liquid-crystal composition of table 12 embodiment 1
| Performance perameter | Parameter value |
| △n | 0.105 |
| Δε | -3.0 |
| V 10 | 2.58 |
| η | 22 |
| C.p | 76 |
Embodiment 2
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 2.1 and table 2.2:
The weight percent of each component in the liquid-crystal composition of table 21 embodiment 2
| Component | Weight percent (%) |
| IA-2 | 20 |
| IA-4 | 20 |
| IA-10 | 15 |
| IIA-1 | 17 |
| IIIA-10 | 6 |
| IIIA-13 | 6 |
| IIIA-14 | 6 |
| IVA-5 | 5 |
| IVA-7 | 5 |
The performance perameter of the liquid-crystal composition of table 2.2 embodiment 2
| Performance perameter | Parameter value |
| △n | 0.112 |
| Δε | -2.9 |
| V 10 | 2.47 |
| η | 22 |
| C.p | 75 |
Embodiment 3
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 3.1 and table 3.2:
The weight percent of each component in the liquid-crystal composition of table 3.1 embodiment 3
| Component | Weight percent (%) |
| IA-2 | 25 |
| IA-4 | 25 |
| IA-10 | 10 |
| IIA-1 | 7 |
| IID-2 | 12 |
| IIIA-9 | 5 |
| IIIA-10 | 5 |
| IIIA-13 | 5 |
| IIIA-14 | 6 |
The performance perameter of the liquid-crystal composition of table 32 embodiment 3
| Performance perameter | Parameter value |
| △n | 0.116 |
| Δε | -3.4 |
| V 10 | 2.41 |
| η | 26 |
| C.p | 75 |
Embodiment 4
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 4.1 and table 4.2:
The weight percent of each component in the liquid-crystal composition of table 41 embodiment 4
| Component | Weight percent (%) |
| IA-2 | 25 |
| IA-4 | 25 |
| IA-10 | 10 |
| IIA-1 | 8 |
| IID-2 | 13 |
| IIIA-10 | 5 |
| IIIA-13 | 3 |
| IIIA-14 | 4 |
| IVA-5 | 4 |
| IVA-7 | 3 |
The performance perameter of the liquid-crystal composition of table 4.2 embodiment 4
| Performance perameter | Parameter value |
| △n | 0.108 |
| Δε | -3.3 |
| V 10 | 2.38 |
| η | 24 |
| C.p | 73 |
Embodiment 5
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 5.1 and table 5.2:
The weight percent of each component in the liquid-crystal composition of table 5.1 embodiment 5
| Component | Weight percent (%) |
| IA-2 | 20 |
| IIA-1 | 50 |
| IID-1 | 10 |
| IIIA-10 | 5 |
| IIIA-13 | 5 |
| IIIA-14 | 5 |
| IVA-5 | 5 |
The performance perameter of the liquid-crystal composition of table 5.2 embodiment 5
| Performance perameter | Parameter value |
| △n | 0.097 |
| Δε | -0.9 |
| V 10 | 5.31 |
| η | 11 |
| C.p | 86 |
Embodiment 6
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 6.1 and table 6.2:
The weight percent of each component in the liquid-crystal composition of table 6.1 embodiment 6
| Component | Weight percent (%) |
| IA-2 | 10 |
| IID-1 | 13 |
| IID-2 | 10 |
| IIA-1 | 50 |
| IIA-4 | 10 |
| IID-3 | 5 |
| IIIA-13 | 2 |
The performance perameter of the liquid-crystal composition of table 6.2 embodiment 6
| Performance perameter | Parameter value |
| △n | 0.072 |
| Δε | -0.4 |
| V 10 | 10.24 |
| η | 9.5 |
| C.p | 79 |
Comparative example 1
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 7.1 and table 7.2:
The weight percent of each component in the liquid-crystal composition of table 71 comparative example 1
The performance perameter of the liquid-crystal composition of table 7.2 comparative example 1
| Performance perameter | Parameter value |
| △n | 0.108 |
| Δε | -3.4 |
| V 10 | 2.18 |
| η | 26 |
| C.p | 75 |
Comparative example 2
Get the liquid crystalline cpd of following weight percent and with method described in the present invention preparation liquid-crystal composition, the performance perameter of the liquid-crystal composition of concrete proportioning and gained is in Table 8.1 and table 8.2:
The weight percent of each component in the liquid-crystal composition of table 8.1 comparative example 2
The performance perameter of the liquid-crystal composition of table 8.2 comparative example 2
| Performance perameter | Parameter value |
| △n | 0.116 |
| Δε | -3.4 |
| V 10 | 2.17 |
| η | 28 |
| C.p | 75 |
In negative dielectric anisotropy liquid crystal composition of the present invention, with the liquid-crystal composition that in embodiment 1～6 prepared by each component proportion, there is excellent light stability and thermostability, because thering is low viscosity, be applicable in the liquid crystal indicator of fast-response simultaneously.Wherein, in embodiment 5 and embodiment 6, the weight percent of I class monomer is less, and the weight percent of II class monomer is larger, and resulting composition viscosity is very low, is particularly useful for field-sequential liquid crystal display.
Each component proportion of negative dielectric anisotropy liquid crystal composition for using in prior art in comparative example 1 and comparative example 2, the liquid-crystal composition of preparing with this proportioning mainly exists viscosity and causes greatly the slow problem of liquid-crystal display response speed.Composition proportioning and comparative example 1 in embodiment 4 are comparatively approaching, and with respect to comparative example 1, embodiment 4 has lower viscosity; Composition proportioning and comparative example 2 in embodiment 3 are comparatively approaching, and with respect to comparative example 2, embodiment 3 has lower viscosity; With respect to comparative example, in embodiment, composition viscosity has declined closely 10%, and it is nearly 10% that its response speed has correspondingly also improved, and obtained significant performance boost.
Negative dielectric anisotropy liquid crystal composition provided by the present invention has low viscosity, high resistivity, larger optical anisotropy and excellent light stability and thermostability, can solve the slow problem of liquid-crystal display response speed, be applicable to the liquid crystal indicator of fast-response.
Although, above used general explanation, embodiment and test, the present invention is described in detail, on basis of the present invention, can make some modifications or improvements it, and this will be apparent to those skilled in the art.Therefore, these modifications or improvements, all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (4)
1. a negative dielectric anisotropy liquid crystal composition, is characterized in that, the component of following weight per-cent, consists of:
account for 20%;
account for 50%;
account for 10%;
account for 5%;
account for 5%;
account for 5%;
account for 5%.
2. a negative dielectric anisotropy liquid crystal composition, is characterized in that, the component of following weight per-cent, consists of:
account for 10%;
account for 13%;
account for 10%;
account for 50%;
account for 10%;
account for 5%;
account for 2%.
3. the application of negative dielectric anisotropy liquid crystal composition in liquid crystal indicator described in claim 1 or 2.
4. the application of negative dielectric anisotropy liquid crystal composition in the VA escope of FFS indicating meter, IPS indicating meter or MVA/PVA/PSVA configuration described in claim 1 or 2.
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| CN103773383B (en) * | 2013-12-30 | 2015-07-15 | 北京八亿时空液晶科技股份有限公司 | Quick-response liquid crystal composition with negative dielectric anisotropy and application thereof |
| CN108659854A (en) * | 2017-03-29 | 2018-10-16 | 北京八亿时空液晶科技股份有限公司 | A kind of liquid-crystal composition and its application |
| CN108690638B (en) * | 2017-04-06 | 2021-08-31 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition |
| CN113512428A (en) * | 2020-04-09 | 2021-10-19 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal composition with negative dielectric anisotropy and application thereof |
| CN113789184B (en) * | 2021-10-12 | 2023-11-10 | 重庆汉朗精工科技有限公司 | Negative large refractive index liquid crystal composition and application thereof |
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| JP5098241B2 (en) * | 2006-07-20 | 2012-12-12 | Ｊｎｃ株式会社 | Liquid crystal composition and liquid crystal display element |
| DE102010012900A1 (en) * | 2009-04-23 | 2010-11-25 | Merck Patent Gmbh | liquid-crystal display |
| JP2013076061A (en) * | 2011-09-15 | 2013-04-25 | Jnc Corp | Liquid crystal composition and liquid crystal display device |
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| EP1736526A1 (en) * | 2005-06-22 | 2006-12-27 | Chisso Corporation | Liquid crystal composition and liquid crystal display device |
| JP2007031694A (en) * | 2005-06-22 | 2007-02-08 | Chisso Corp | Liquid crystal composition and liquid crystal display element |
| JP2010037476A (en) * | 2008-08-07 | 2010-02-18 | Chisso Corp | Liquid crystal composition and liquid crystal display element |
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