CN105219400B - Liquid-crystal composition and the display element or display using the liquid-crystal composition - Google Patents
Liquid-crystal composition and the display element or display using the liquid-crystal composition Download PDFInfo
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Abstract
The invention discloses a kind of liquid-crystal composition and using the display element or display of the liquid-crystal composition, liquid-crystal composition contains one or more formulas I, formula II, general formula III, general formulae IV compound,Wherein, R1、R2、R3Represent the straight chained alkyl that carbon number is 1~5, R4It is 1~3 straight chained alkyl to represent H or carbon number, and n is 0,1,2.This liquid-crystal composition has that fast response time, dielectric anisotropy be big, optical anisotropy is moderate, and with the good stability to light and heat, be particularly suitable for use in IPS liquid crystal display devices.
Description
Technical field
Liquid crystal display cells or liquid crystal display the present invention relates to a kind of liquid-crystal composition and comprising the liquid-crystal composition.
Background technology
At present, what the application of liquid-crystal compounds was expanded is increasingly wider, and it can be applied to polytype display, electricity
In optical device, sensor etc..Species for the liquid-crystal compounds of above-mentioned display field is various, and wherein nematic liquid crystal is using most
To be extensive.Nematic liquid crystal is had been applied in passive TN, STN matrix display and system with tft active matrix.
For thin-film transistor technologies (TFT-LCD) application field, although market is very huge in recent years, technology
It is gradually ripe, but requirement of the people to Display Technique also constantly improving, and is especially realizing quick response, reduction driving electricity
Pressure is with terms of reducing power consumption.Liquid crystal material is as one of important photoelectron material of liquid crystal display, to improving liquid crystal display
The performance of device plays an important role.
As liquid crystal material it is necessary to have good chemically and thermally stability and to electric field and the stabilization of electromagnetic radiation
Property.And as thin-film transistor technologies (TFT-LCD) liquid crystal material, do not need only to have as outside upward stability, should also have
Wider nematic temperature range, suitable birefringence anisotropy, very high resistivity, good uviolresistance
The performances such as energy, high electric charge conservation rate and low-steam pressure.
Show and apply for dynamic menu, eliminate display picture ghost and hangover, it is desirable to which liquid crystal has response speed quickly
Degree, therefore it is required that liquid crystal has relatively low rotary viscosity γ1；In addition, for portable set, in order to reduce equipment energy consumption, wishing
Hope that the driving voltage of liquid crystal is as low as possible；And for the display of the purposes such as TV, for the driving voltage requirement of liquid crystal
It is not so low.
The viscosity of liquid-crystal compounds, especially rotary viscosity γ1The response time after liquid crystal power-up is directly affected, either
Rise time (ton) or fall time (toff), all rotary viscosity γ with liquid crystal1It is proportional, rise time (ton) by
In relevant with liquid crystal cell and driving voltage, it can be adjusted by increasing the method for driving voltage with reduction liquid crystal cell box thickness；And
Fall time (toff), mainly with the elastic constant of liquid crystal with liquid crystal cell box thickness relevant, box thick decline unrelated with driving voltage
(t can be reduced fall timeoff), and under different display modes, the motion mode of liquid crystal molecule is different, tri- kinds of moulds of TN, IPS, VA
Formula respectively at average elastic constants K, distortion elastic constant, bend elastic constant inversely.
According to liquid crystal continuum theory, after a variety of liquid crystal are deformed upon under external force (electric field, magnetic field) effect, meeting
By intermolecular interaction, original shape is returned in meeting " resilience "；Likewise, liquid crystal is also due to intermolecular interaction
Power formation " viscosity ".The minor variations of liquid crystal molecule, can make the conventional parameter performance of liquid crystal occur obvious change, these changes
Have plenty of certain rule, being almost difficult of having finds rule, can also be produced for the interaction between liquid crystal molecule substantially
Influence, these influences are very delicate, also do not form very perfect theoretical explanation so far.
The viscosity of liquid crystal is relevant with liquid crystal molecule structure, studies the viscosity and liquid of the liquid crystal system of different liquid crystal molecule formation
Relation between brilliant molecular structure is one of vital task of dispensing liquid crystal engineer.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of liquid-crystal composition and the liquid crystal using the liquid-crystal composition
Display element or liquid crystal display, the liquid-crystal composition have relatively low viscosity, it is possible to achieve quick response, while having larger
Dielectric anisotropy Δ ε, moderate optical anisotropy Δ n, high stability to light and heat, good uviolresistance
The performances such as energy, high electric charge conservation rate and low-steam pressure.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of liquid-crystal composition, includes one or more generalformulaⅰcompounds, one or more compounds of formula II, one kind
Or a variety of general formula III compounds, one or more general formulae IV compounds,
Wherein, R1、R2、R3The straight chained alkyl for being 1~5 for carbon number, R4The straight chain alkane for being 1~3 for H or carbon number
Base, n is 0,1,2.
Δ n [589nm, 25 DEG C] ＞ 0.08, Δ ε [1KHz, 25 DEG C] ＞ 2 of liquid-crystal composition provided by the present invention, clearly
70.0 DEG C of bright spot Cp ＞, rotary viscosity γ1[25 DEG C] are between 40~110mPas.
The compound quality percentage composition of liquid-crystal composition formula of I provided by the present invention is 5~30%, the chemical combination of formula II
Amount of substance percentage composition is 5~20%, and general formula III compound quality percentage composition is 5~30%, general formulae IV compound quality hundred
It is 20~50% to divide content.
Liquid-crystal composition provided by the present invention further improvement is that：Generalformulaⅰcompound is the compound of formula I 1~I 4,
The compound of formula II is the general formula compound of formula II 1~II 5, and general formula III compound is the general formula compound of formula III 1~III 3, general formulae IV
Compound is the compound of formula IV 1~IV 4,
The dielectric anisotropy Δ ε of the compound of above-mentioned formula I 1~I 4 has low rotation simultaneously between 25-30
Turn viscosity, clearing point is more than 120 DEG C, and Δ n is more than 0.2.Generalformulaⅰcompound is conducive in raising liquid-crystal composition Δ ε, carried
High clearing point, raising Δ n.
The alkyl chain carbon atomicity of the compound of above-mentioned formula II 1~II 5 is more, and the clearing point CP of liquid crystal can be higher, still
Viscosity can increase simultaneously.
Compound shown in above-mentioned formula III 1~III 3 and compound phase shown in formula II are relatively low than with higher clearing point CP
Viscosity, especially with bigger elastic constant.Be conducive to improving response speed.
The compound of above-mentioned formula IV 1~IV 4 has very low rotary viscosity γ1, close to neutral dielectric anisotropy Δ
ε, less optical anisotropy Δ n, have advantage improving liquid crystal viscosity, cryogenic property.Different alkyl substituents are to liquid
Brilliant rotary viscosity γ1, clearing point CP all there is influence, general longer alkyl chain or alkenylene chain can increase the rotation of liquid crystal
Viscosity γ1Clearing point CP is improved simultaneously.
Compound shown in one or more formulas V, and its quality can also be added in liquid-crystal composition provided by the present invention
Content is 1~15%,
R5、R6The alkyl or alkoxy for being 1~5 for carbon number, X1For H or F.
Above-mentioned technical proposal further improvement is that：The compound of formula V is the compound of formula V 1~V 8,
V 1 to V 7 compounds are respectively provided with larger elastic constant K (K11, K22, K33 are larger), high clearing point CP
(being higher than 200 DEG C), but also there is viscosity γ 1 bigger than normal, K value parameters and clearing point CP available for adjustable liquid crystal display simultaneously.Ⅴ1
To V 7 compound dielectric anisotropy Δ ε substantially close to neutrality, V 1 to V 4 compounds have lateral fluorine atom, are conducive to changing
The intersolubility of kind liquid crystal.
Liquid-crystal composition provided by the present invention, can also include the compound of formula VI, and its mass content is 1~20%,
R7The alkenyl that the straight chained alkyl for being 1~5 for carbon number, carbon number are 2~5, X2、X3For H or F.
Compound shown in formula VI is further defined to the 1- VI 3 of following formula VI compound：
Compound shown in formula VI 1~VI 3 generally has the intersolubility good with other liquid crystal, with fluorine atom substituent
Increase, VI 1, VI 2, VI 3 dielectric anisotropy Δ ε gradually increase, and VI 1 reach 12 or so for 5 or so, VI 3；Optical anisotropy
Δ n has reduction trend with the increase by VI 1, VI 2, VI 3 of fluorine atom substituent, is close to or slightly greater than within the scope of suitable
The Δ n of mixed liquid crystal, between 0.11 to 0.13.
When the ratio of each composition of above-mentioned liquid-crystal composition is different, slightly discrepant performance can be shown, such as dielectric is each
Anisotropy Δ ε, optical anisotropy Δ n, the nematic phase of liquid crystal are converted into the transition temperature point CP of liquid, low temperature stability inferior all
Can difference, can apply to different types of display device, but it is identical the characteristics of be its rotary viscosity γ1It is relatively low.Should
For liquid crystal display device, it is possible to achieve quick response.
The dopant of various functions can also be added in liquid-crystal compounds provided by the present invention, dopant content is preferred
Between 0.01~1%, these dopants are mainly antioxidant, ultra-violet absorber, chiral agent.
Antioxidant, ultra-violet absorber are preferred：
S represents 1~10 integer.
Chiral agent is preferably (left-handed or dextrorotation)：
The invention further relates to the liquid crystal display cells comprising any one above-mentioned liquid-crystal composition or display, the display
Element or display are active matrix display element or display, passive matrix display element or display.The liquid crystal display
Element or the preferred active array addressing liquid crystal display cells of liquid crystal display or display.
The active matrix display element or display are specially TN-TFT or IPS-TFT liquid crystal display cells or display
Device.
By adopting the above-described technical solution, the technological progress that the present invention is obtained is：
Liquid-crystal composition provided by the present invention has relatively low viscosity, it is possible to achieve quick response, while having moderate
Dielectric anisotropy Δ ε, moderate optical anisotropy Δ n, the high stability to light and heat.
Include the liquid crystal material of liquid-crystal composition provided by the present invention, not only with good chemically and thermally stability with
And to electric field and the stability of electromagnetic radiation.Moreover, using liquid crystal material as thin-film transistor technologies (TFT-LCD), also have
Wider nematic temperature range, suitable birefringence anisotropy, very high resistivity, good uviolresistance
The performances such as energy, high electric charge conservation rate and low-steam pressure.
Embodiment
The present invention is described in further details with reference to specific embodiment, but the present invention is not limited to following implementation
Example.Methods described is conventional method unless otherwise instructed.The raw material unless otherwise instructed can be from open commercial sources
.The percentage is mass percent unless otherwise instructed.
In following embodiments,
CP represents clearing point, is directly determined using the micro- thermal analyzers of WRX-1S, sets heating rate as 3 DEG C/min.Δn
Optical anisotropy (589nm, 20 DEG C) is represented, Δ ε represents dielectric anisotropy (25 DEG C, 1KHz, HP4284A, 5.2 microns of TN
Left-handed box), γ1Rotary viscosity (mpas) at 20 DEG C is represented, VHR (%) represents electric charge conservation rate (5V, 60Hz, 20 DEG C), ρ (×
1013Ω cm) represent resistivity (20 DEG C), voltage retention VHR (%) tester and electricalresistivityρ (× 1013Ω cm)
For TOYO06254 and TOYO6517 type liquid crystal evaluation of physical property system, (20 DEG C of test temperature, time 16ms, testing cassete is 7.0 micro-
Rice).
The present patent application embodiment liquid crystal monomer structure represents with code, liquid crystal ring structure, end group, the code of linking group
Method for expressing see the table below (one), table (two).
Table (one)：The corresponding code of ring structure
Table (two)：End group and the corresponding code for linking group
| End group is with linking group | Correspondence code |
| CnH2n+1- | n |
| CnH2n+1O- | nO |
| -CF2O- | Q |
| -F | F |
| -CH2=CH2- | V |
Citing：It is expressed as 3CCV1,
Be designated as 3B B (3F) B (3F, 5F) Q B (3F,
5F)F。
Embodiment 1
Embodiment 2
Embodiment 3
Embodiment 4
Embodiment 5
Embodiment 6
Embodiment 7
As can be seen from the above embodiments：The liquid-crystal composition of the present invention has relatively low rotary viscosity γ1, for liquid crystal
Display, it is possible to achieve quick response.It is particularly suitable for TN, IPS pattern liquid crystal material.
Claims (6)
1. a kind of liquid-crystal composition, it is characterised in that：Change comprising one or more generalformulaⅰcompounds, one or more formulas II
Compound, one or more general formula III compounds, one or more general formulae IV compounds,
Wherein, R1、R2、R3The straight chained alkyl for being 1~5 for carbon number, R4The straight chained alkyl for being 1~3 for H or carbon number, n is
0、1、2；
The compound of formula V is also included, and its mass content is 1~15%,
R5、R6The alkyl or alkoxy for being 1~5 for carbon number, X1For H or F；
The compound of formula VI is also included, and its mass content is 1~20%,
R7The alkenyl that the straight chained alkyl for being 1~5 for carbon number, carbon number are 2~5；X2、X3For H or F；
Generalformulaⅰcompound weight/mass percentage composition is 5~30%, and the compound quality content of formula II is 5~20%, general formula III chemical combination
Amount of substance content is 5~30%, and general formulae IV compound quality content is 20~50%.
2. liquid-crystal composition according to claim 1, it is characterised in that：Generalformulaⅰcompound is the compound of formula I 1~I 4, is led to
The compound of formula II is the general formula compound of formula II 1~II 5, and general formula III compound is the general formula compound of formula III 1~III 3, general formulae IV
Compound is the compound of formula IV 1~IV 4,
3. liquid-crystal composition according to claim 1, it is characterised in that：The compound of formula V is the compound of formula V 1~V 8,
4. liquid-crystal composition according to claim 1, it is characterised in that：The compound of formula VI is the compound of formula VI 1~VI 3,
R7The alkenyl that the straight chained alkyl for being 1~5 for carbon number, carbon number are 2~5.
5. include the liquid crystal display cells or display of any liquid-crystal composition in Claims 1 to 4, it is characterised in that：
The display element or display are active matrix display element or display, passive matrix display element or display.
6. liquid crystal display cells according to claim 5 or display, it is characterised in that：Liquid-crystal composition formula of I is changed
Compound weight/mass percentage composition is 6~24%, and the compound quality percentage composition of formula II is 6~15%, general formula III compound quality
Percentage composition is 5~20%, and the weight/mass percentage composition of the compound of formula IV is 25~45%, the weight/mass percentage composition of the compound of formula V
For 5~14%, the weight/mass percentage composition of the compound of formula VI is 5~20%.
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| CN201510672573.3A CN105219400B (en) | 2015-10-16 | 2015-10-16 | Liquid-crystal composition and the display element or display using the liquid-crystal composition |
| TW104143906A TWI570220B (en) | 2015-10-16 | 2015-12-25 | A liquid crystal composition, and a display element or a display using the liquid crystal composition |
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