CN106916594A - A kind of big dielectric anisotropy liquid crystal composition and its application - Google Patents
A kind of big dielectric anisotropy liquid crystal composition and its application Download PDFInfo
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
The present invention relates to technical field of liquid crystal display, more particularly to a kind of big dielectric anisotropy liquid crystal composition, it contains liquid-crystal compounds described in formula I-VI, compound of Formula I is to contain 2- methyl -3,4, the compound that 5- trifluoro-benzenes are connected with difluoro-methoxy bridged bond, such compound has strong polarity, can be effectively increased the dielectric anisotropy of liquid-crystal composition；Compounds of formula II is twin nuclei, with low rotary viscosity and excellent intersolubility feature；Compound of formula III is nonpolar tricyclic compound, and such monomer has clearing point and big elastic constant high, is conducive to improving the elastic constant of liquid-crystal composition, other liquid-crystal compounds also to possess ideal performance.Liquid-crystal composition of the present invention has low rotary viscosity, big elastic constant, good low temperature intersolubility and fast response speed, can be used for the fast-response liquid crystal display of plurality of display modes, its use in TN, IPS or FFS mode display can be obviously improved liquid crystal display display effect.
Description
Technical field
The present invention relates to a kind of liquid-crystal composition, it is specifically a kind of with big dielectric it is each to
The opposite sex liquid-crystal composition, exactly liquid-crystal composition provided by the present invention there is fast sound
Between seasonable.Belong to liquid crystal material and its application field.
Background technology
At present, liquid crystal is widely applied in field of information display, while in optical communication
Using also making some progress (S.T.Wu, D.K.Yang.Reflective Liquid Crystal
Displays.Wiley, 2001).In recent years, the application field of liquid-crystal compounds was significantly opened up
Width arrives kinds of displays part, electro-optical device, electronic component, sensor etc., nematic crystal
Compound obtains most commonly used application in flat-panel monitor, particularly active for TFT
In the system of matrix.
Liquid crystal display experienced very long road for development with the discovery of liquid crystal.Austria in 1888
Botanist Friedrich Reinitzer are found that the first liquid crystal material benzoic acid cholesterol
(cholesteryl benzoate).Manguin has invented rubbing within 1917, is used to make
Make single domain liquid crystal and research optical anisotropy.E.Bose establishes moving within 1909
(Swarm) theory, and obtain the experiment support of L.S.Ormstein and F.Zernike et al.
(1918), statistical fluctuation is discussed as by De Gennes.G.W.Oseen and
H.Zocher founded continuum theory in 1933, and obtained F.C.Frank perfect (1958).
M.Born (1916) and K.Lichtennecker (nineteen twenty-six) have found and have studied liquid crystal
Dielectric anisotropy.1932, nematic phase was divided into the positive and negative major class of property two by W.Kast accordingly.
Nineteen twenty-seven, V.Freedericksz and V.Zolinao have found that nematic liquid crystal is made in electric field or magnetic field
Under, voltage threshold (Freederichsz transformations) is deformed upon and existed.This is found to be liquid
The making of crystal display provides foundation.
Nineteen sixty-eight RCA Corp. of U.S. R.Williams has found nematic liquid crystal shape under electric field action
Into striped farmland, and there is light scattering phenomenon.G.H.Heilmeir with will its develop into dynamic scattering
Display pattern, and it is made first liquid crystal display (LCD) in the world.Early seventies,
Helfrich and Schadt have invented TN principles, and people utilize TN photoelectric effect and integrated circuit phase
With reference to, display device (TN-LCD) is made, it is that the application of liquid crystal has opened up wide
Prospect.Since the seventies, due to the development of large scale integrated circuit and liquid crystal material, liquid crystal
Application in terms of display achieves breakthrough development, 1983~1985 years T.Scheffer et al.
Successively propose super-twist nematic (Super Twisred Nematic：STN) pattern and
Active matrix (the Active matrix that P.Brody was proposed in 1972：AM) mode is weighed
It is new to use.Traditional TN-LCD technologies have developed into STN-LCD and TFT-LCD technologies,
Although the number of scanning lines of STN up to 768 rows more than, remain when the temperature increases
The problems such as response speed, visual angle and gray scale, therefore large area, high information quantity, colored display
Active Matrix LCD At mode is used mostly.TFT-LCD is widely used for direct viewing type TV, big
Screen projection televisions, terminal show and some military instrument show, it is believed that TFT-LCD
Technology has more wide application prospect.
Wherein " active matrix " includes two types：1st, the OMS on the silicon wafer as substrate
(metal-oxide semiconductor (MOS)) or other diodes.2nd, on the glass plate as substrate
Thin film transistor (TFT) (TFT).
Monocrystalline silicon limits display size as substrate material, because each several part display device is even
There are many problems in its junction in module assembled.Thus, second thin film transistor (TFT) is that have
The active matrix type of prospect, the photoelectric effect for being utilized typically TN effects.TFT includes changing
Compound semiconductor, such as Cdse, or the TFT based on polycrystalline or amorphous silicon.
At present, LCD product technologies are ripe, successfully solve visual angle, resolution ratio, color
The technical barrier such as saturation degree and brightness, its display performance is already close to or more than CRT monitor.
Large scale and small-medium size LCD have gradually occupied the main flow of flat-panel monitor in respective field
Status.The driving voltage of liquid crystal display depends on the dielectric anisotropy of liquid crystal material, lifting
Dielectric anisotropy can be effectively reduced liquid crystal display power consumption.But lift Jie of liquid crystal material
Electric anisotropic, the rotary viscosity that can cause liquid crystal material is to rise, and causes the response time slack-off.
Specifically, the response time of liquid crystal be limited to liquid crystal rotary viscosity γ 1 and elasticity often
Number, reduces the rotary viscosity and lifting elastic constant of liquid-crystal composition for reducing liquid crystal display
Response time, accelerate liquid crystal display response speed have significant effect.
The content of the invention
The present invention provides a kind of fast-response liquid-crystal composition, and it comprises at least a kind of formula I institute's generations
The compound of table：
Wherein, R1Represent C1~C12Straight chained alkyl, wherein one or more non-conterminous CH2
Can be replaced by O, S or CH=CH；L1Represent H or F；N represents 0 or 1；A is represented：
And the compound representated by least one formula II：
Wherein, R2、R3C is represented independently of one another1~C12Straight chained alkyl, one of them or it is many
Individual non-conterminous CH2Can be replaced by O, S or CH=CH；B, C are represented independently of one another
And the compound representated by least one general formula III：
Wherein, R4、R5C is represented independently of one another1~C12Straight chained alkyl；D is represented：
And including at least the compound representated by a kind of formula IV：
Wherein, R6Represent C1~C12Straight chained alkyl；E is represented
And including at least the compound representated by a kind of formula V：
Wherein, R7C is represented independently of one another1~C12Straight chained alkyl；
The compound representated by formula formula I that the present invention is provided is to contain 2- methyl -3,4,5- trifluoros
The polar compound of benzene structure and difluoro-methoxy bridged bond, the structure has big dielectric each to different
Property.
Preferably, the compound representated by formula I provided by the present invention be selected from Formulas I A, IB and
Compound representated by IC：
Wherein, R1Represent C1~C7Straight chained alkyl；
It is highly preferred that the compound representated by formula I is selected from the one kind or many in Formulas I A-1~IC-4
Kind：
Most preferably, compound representated by formula I is selected from IA-2, IB-1, IB-2, IC-1 and IC-2
In one or more.
Compound representated by formula II provided by the present invention is twin nuclei, such compound
With low rotary viscosity and excellent intersolubility；
Preferably, the compound representated by formula II is selected from the compound in Formula II A, IIB：
Wherein, R2Represent C1~C7Straight chained alkyl, R3Represent C1~C7Straight chained alkyl, straight chain
Alkoxy or C2~C7Straight-chain alkenyl；
It is highly preferred that the compound representated by formula II is selected from the one kind in Formula II A-1~Formula II B-24
Or it is various：
Most preferably, the compound representated by formula II be selected from IIA-1, IIA-1, IIA-14, IIB-2,
One or more in IIB-4, IIB-15 and IIB-16.
Compound representated by general formula III provided by the present invention is tricyclic compound, such chemical combination
Thing has clearing point and big elastic constant higher；
Preferably, the compound representated by general formula III is selected from the compound representated by IIIA and IIIB：
Wherein, R4、R5C is represented independently of one another1~C7Straight chained alkyl；
It is highly preferred that compound representated by general formula III is selected from formula III A-1 and IIIB-12 structure
One or more：
Most preferably, the compound representated by general formula III is selected from IIIA-2, IIIA-10, IIIB-2
With one or more in IIIB-6.
Preferably, the compound representated by formula IV is selected from the one kind or many in formula IV A and IVB
Kind：
Wherein, R6C is represented independently of one another1~C7Straight chained alkyl；
It is highly preferred that the compound representated by formula IV is selected from formula IV A-1~formula IV B-4
Plant or various：
Most preferably, the compound representated by formula IV is selected from IVA-2, IVB-1 and IVB-2
One or more.
Preferably, the compound representated by formula V is selected from the one kind or many in Formula V -1~Formula V -4
Kind：
Liquid-crystal composition provided by the present invention is also comprising representated by one or more formula VI
Compound：
R8Represent C1~C12Straight chained alkyl, G represent
Preferably, compound of the compound representated by formula VI as representated by VIA and VIB：
R8Represent C1~C7Straight chained alkyl；
It is highly preferred that the compound representated by formula VI is selected from Formula IV A-1~Formula IV B-4
Plant or various：
For specific, in order that liquid-crystal composition meets different demands, liquid of the present invention
Crystal composite by weight percentage, the compound comprising following weight/mass percentage composition：
Compound representated by (1) 10~50% formula I；
Compound representated by (2) 20~60% formula II；
Compound representated by (3) 1~15% general formula III；
Compound representated by (4) 1~20% formula IV；
Compound representated by (5) 2~25% formula V；
Compound representated by (6) 0~15% formula VI.
Preferably, change of the liquid-crystal composition provided by the present invention comprising following weight/mass percentage composition
Compound (total amount is 100%)：
Compound representated by (1) 15~35% formula I；
Compound representated by (2) 30~50% formula II；
Compound representated by (3) 3~10% general formula III；
Compound representated by (4) 2~15% formula IV；
Compound representated by (5) 2~20% formula V；
Compound representated by (6) 0~10% formula VI；
It is highly preferred that change of the liquid-crystal composition provided by the present invention by following weight/mass percentage composition
Compound constitutes (total amount is 100%)：
Compound representated by (1) 17~32% formula I；
Compound representated by (2) 41~47% formula II；
Compound representated by (3) 4~7% general formula III；
Compound representated by (4) 2.5~13.5% formula IV；
Compound representated by (5) 4~19% formula V；
Compound representated by the formula VI of (6) 0~9.5% (preferably 7-9.5%)；
Or by following weight/mass percentage composition compound group into (total amount is 100%)：
Compound representated by (1) 23~28% formula I；
Compound representated by (2) 41~46% formula II；
Compound representated by (3) 4~6% general formula III；
Compound representated by (4) 6~11% formula IV；
Compound representated by (5) 14~19% formula V；
(6) compound representated by the formula VI of 7-9.5%；
Most preferably, liquid-crystal composition provided by the present invention by following compound group into (below
It is mass percent):
Compound representated by liquid-crystal composition formula of I provided by the present invention is to contain 2- first
Base -3, the compound that 4,5- trifluoro-benzenes are connected with difluoro-methoxy bridged bond, such compound has strong
Polarity, the dielectric anisotropy of liquid-crystal composition can be effectively increased；Change representated by formula II
Compound is twin nuclei, is fast-response with low rotary viscosity and excellent intersolubility feature
The essential component of liquid crystal display；Compound representated by general formula III is nonpolar three cyclisation conjunctions
Thing, such monomer has clearing point and big elastic constant high, is conducive to improving liquid crystal combination
The elastic constant of thing；Compound representated by formula IV is to contain OCF3Three cyclisation of group are closed
Thing, the structure has big elastic constant and certain polarity；Compound representated by formula V
It is tetracyclic compound, with clearing point very high, can effectively lifts the clear of liquid-crystal composition
Bright spot characteristic；3,4- difluoros benzene-like compounds representated by formula VI have stronger dielectric each
Anisotropy and excellent intersolubility, and the low pole having can promote highly polar I classes and neutrality
II classes dissolve each other.
The preparation method of liquid-crystal composition of the present invention can use routine side without specifically limited
Method is produced the mixing of two or more compounds, such as by mixing different groups at high temperature
Divide and be prepared by method soluble in one another, wherein, liquid-crystal composition is dissolved in for the chemical combination
In the solvent of thing and mix, the solvent is then distilled out under reduced pressure；Or it is of the present invention
Liquid-crystal composition can be prepared conventionally, such as will wherein the less component of content compared with
Be dissolved at temperature high in the larger key component of content, or will it is each belonging to component organic
Dissolved in solvent, such as acetone, chloroform or methyl alcohol, after solution then is mixed into removal solvent
Obtain.
Liquid-crystal composition of the present invention has low rotary viscosity, big elastic constant, good
Low temperature intersolubility and fast response speed, can be used for the fast-response liquid of plurality of display modes
Crystalline substance display, its use in TN, IPS or FFS mode display can be obviously improved liquid crystal
Display display effect.
Specific embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Unless otherwise indicated, percentage is weight percentage in the present invention；Temperature unit is Celsius
Degree；△ n represent optical anisotropy (25 DEG C)；△ ε represent dielectric anisotropy (25 DEG C,
1000Hz)；V10Threshold voltage is represented, is the character voltage when relative permeability changes 10%
(V, 25 DEG C)；γ 1 represents rotary viscosity (mPa.s, 25 DEG C)；Cp represents liquid-crystal composition
Clearing point (DEG C)；K11、K22、K33Splay, distortion and bend elastic constant are represented respectively
(pN, 25 DEG C).
In following embodiment, code shown in unit structure table 1 is represented in liquid-crystal compounds.
Table 1：The unit structure code of liquid-crystal compounds
By taking following compound structure as an example：
It is expressed as：4CDUQKF
It is expressed as：5CCPUF
In following embodiment, the preparation of liquid-crystal composition uses heat of solution method, including with
Lower step：Weigh liquid-crystal compounds by weight percentage with balance, wherein weigh addition sequence without
Particular requirement, the generally order with liquid-crystal compounds fusing point from high to low weigh mixing successively,
Heating stirring causes that each component melts uniformly at 60~100 DEG C, then through filtering, revolving, finally seals
Dress obtains final product target sample.
In following embodiment, the weight percent of each component when liquid crystal combination in liquid-crystal composition
The performance parameter of thing sees below form.
Embodiment 1
Table 2：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 2
Table 3：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 3
Table 4：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 4
Table 5：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 5
Table 6：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 6
Table 7：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 7
Table 8：The weight percent of each component when performance parameter in liquid-crystal composition
Comparative example 1
Table 9：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 1 is converged with each performance parameter value of the gained liquid-crystal composition of comparative example 1
Always compare, referring to table 10.
Table 10：The performance parameter of liquid-crystal composition compares
| △n | △ε | Cp | γ1 | ||||
| Embodiment 1 | 0.100 | +7.8 | 93 | 77 | 13.0 | 6.5 | 15.6 |
| Comparative example 1 | 0.100 | +7.4 | 91 | 85 | 12.6 | 6.3 | 15.5 |
Understood through comparing：Compared with comparative example 1, the liquid-crystal composition rotation that embodiment 1 is provided
Turn the low and bigger elastic constant of viscosity, therefore possess the shorter response time and ring faster
Answer speed.
Comparative example 2
Table 11：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 1 is converged with each performance parameter value of the gained liquid-crystal composition of comparative example 2
Always compare, referring to table 12.
Table 12：The performance parameter of liquid-crystal composition compares
| △n | △ε | Cp | γ1 | ||||
| Embodiment 1 | 0.100 | +7.8 | 93 | 77 | 13.0 | 6.5 | 15.6 |
| Comparative example 1 | 0.100 | +6.6 | 92 | 84 | 12.4 | 6.2 | 15.6 |
Understood through comparing：Compared with comparative example 2, the liquid-crystal composition rotation that embodiment 1 is provided
Turn the low and bigger elastic constant of viscosity, therefore possess the shorter response time and ring faster
Answer speed.
As seen from the above embodiment, liquid-crystal composition provided by the present invention has big dielectric
Anisotropy and low rotary viscosity, thus liquid-crystal composition provided by the present invention have it is low
Driving voltage and fast response speed.Therefore, liquid-crystal composition provided by the present invention is fitted
For TN, IPS and FFS type TFT liquid crystal display devices of fast-response, it is particularly suited for
IPS and FFS liquid crystal display devices, are particularly well-suited to the liquid crystal display device of fast-response.
Although above making to the present invention with a general description of the specific embodiments
Description in detail, but on the basis of the present invention, it can be made some modifications or improvements, this
Will be apparent to those skilled in the art.Therefore, without departing from spirit of the invention
On the basis of these modifications or improvements, belong to the scope of protection of present invention.
Claims (10)
1. a kind of big dielectric anisotropy liquid crystal composition, it is characterised in that：The liquid crystal group
Compound comprises at least the compound representated by a kind of formula I：
Wherein, R1Represent C1~C12Straight chained alkyl, wherein one or more non-conterminous CH2
Can be replaced by O, S or CH=CH；L1Represent H or F；N represents 0 or 1；A is represented：
And including at least a kind of compounds of formula II：
Wherein, R2、R3C is represented independently of one another1~C12Straight chained alkyl, one of them or it is many
Individual non-conterminous CH2Can be replaced by O, S or CH=CH；B, C are represented independently of one another
And the compound representated by least one general formula III：
Wherein, R4、R5C is represented independently of one another1~C12Straight chained alkyl；D is represented：
And including at least the compound representated by a kind of formula IV：
Wherein, R6Represent C1~C12Straight chained alkyl；E is represented
And including at least the compound representated by a kind of formula V：
Wherein, R7Represent C1~C12Straight chained alkyl.
2. the liquid-crystal composition according to claim 1, it is characterised in that：Formula I
Representative compound is selected from one or more of representative compound in following formula：
Wherein, R1Represent C1~C7Straight chained alkyl；
It is preferred that the compound representated by the formula I is selected from one or more in Formulas I A-1~IC-4：
Most preferably, compound representated by formula I is selected from IA-2, IB-1, IB-2, IC-1 and IC-2
In one or more.
3. liquid-crystal composition according to claim 1 and 2, it is characterised in that：Formula II
Representative compound is selected from the compound of Formula II A, IIB：
Wherein, R2Represent C1~C7Straight chained alkyl, R3Represent C1~C7Straight chained alkyl, straight chain
Alkoxy or C2~C7Straight-chain alkenyl；
It is highly preferred that the compound representated by formula II is selected from the one kind in Formula II A-1~Formula II B-24
Or it is various：
Most preferably, the compound representated by formula II be selected from IIA-1, IIA-1, IIA-14, IIB-2,
One or more in IIB-4, IIB-15 and IIB-16.
4. the liquid-crystal composition according to claim any one of 1-3, it is characterised in that：It is logical
Compound representated by formula III is selected from the compound representated by IIIA and IIIB：
Wherein, R4、R5C is represented independently of one another1~C7Straight chained alkyl；
It is highly preferred that compound representated by general formula III is selected from formula III A-1 and IIIB-12 structure
One or more：
Most preferably, the compound representated by general formula III is selected from IIIA-2, IIIA-10, IIIB-2
With one or more in IIIB-6.
5. the liquid-crystal composition according to claim any one of 1-4, it is characterised in that：It is logical
Compound representated by formula IV is selected from one or more in formula IV A and IVB：
Wherein, R6Represent C1~C7Straight chained alkyl；
It is highly preferred that the compound representated by formula IV is selected from formula IV A-1~formula IV B-4
Plant or various：
Most preferably, the compound representated by formula IV is selected from IVA-2, IVB-1 and IVB-2
One or more.
6. the liquid-crystal composition according to claim any one of 1-5, it is characterised in that：
Compound representated by formula V is selected from one or more in Formula V -1~Formula V -4：
7. the liquid-crystal composition according to claim any one of 1-6, it is characterised in that：
The liquid-crystal composition is also comprising the compound representated by one or more formula VI：
R8Represent C1~C12Straight chained alkyl, G represent
Preferably, compound of the compound representated by formula VI as representated by VIA and VIB：
R8Represent C1~C7Straight chained alkyl；
It is highly preferred that the compound representated by formula VI is selected from Formula IV A-1~Formula IV B-4
Plant or various：
8. the liquid-crystal composition according to claim any one of 1-7, it is characterised in that：It is described
Liquid-crystal composition by weight percentage, the compound comprising following weight/mass percentage composition：
Compound representated by (1) 10~50% formula I；
Compound representated by (2) 20~60% formula II；
Compound representated by (3) 1~15% general formula III；
Compound representated by (4) 1~20% formula IV；
Compound representated by (5) 2~25% formula V；
Compound representated by (6) 0~15% formula VI.
9. the liquid-crystal composition according to claim any one of 1-8, it is characterised in that：It is described
Liquid-crystal composition by weight percentage, including following components：
Compound representated by (1) 15~35% formula I；
Compound representated by (2) 30~50% formula II；
Compound representated by (3) 3~10% general formula III；
Compound representated by (4) 2~15% formula IV；
Compound representated by (5) 2~20% formula V；
Compound representated by (6) 0~10% formula VI；
It is highly preferred that the liquid-crystal composition is by weight percentage, including following components：
Compound representated by (1) 17~32% formula I；
Compound representated by (2) 41~47% formula II；
Compound representated by (3) 4~7% general formula III；
Compound representated by (4) 2.5~13.5% formula IV；
Compound representated by (5) 4~19% formula V；
Compound representated by (6) 0~9.5% formula VI；
Or the liquid-crystal composition is by weight percentage, including following components：
Compound representated by (1) 23~28% formula I；
Compound representated by (2) 41~46% formula II；
Compound representated by (3) 4~6% general formula III；
Compound representated by (4) 6~11% formula IV；
Compound representated by (5) 14~19% formula V；
(6) compound representated by the formula VI of 7-9.5%；
Most preferably, the liquid-crystal composition by following compound group into：
10. liquid-crystal composition described in any one of claim 1-9 in liquid crystal display device should
With；It is preferred that described liquid crystal display device is TN, IPS or FFS type liquid crystal display.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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