CN108239545B - Liquid crystal composition having negative dielectric anisotropy and display device thereof - Google Patents
Liquid crystal composition having negative dielectric anisotropy and display device thereof Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 136
- 239000000203 mixture Substances 0.000 title claims abstract description 98
- 150000001875 compounds Chemical class 0.000 claims abstract description 87
- 125000004432 carbon atom Chemical group C* 0.000 claims description 26
- 125000000217 alkyl group Chemical group 0.000 claims description 15
- 125000003545 alkoxy group Chemical group 0.000 claims description 14
- 125000003342 alkenyl group Chemical group 0.000 claims description 10
- 125000003302 alkenyloxy group Chemical group 0.000 claims description 8
- 125000001153 fluoro group Chemical group F* 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 24
- 230000003287 optical effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 125000004955 1,4-cyclohexylene group Chemical group [H]C1([H])C([H])([H])C([H])([*:1])C([H])([H])C([H])([H])C1([H])[*:2] 0.000 description 1
- 125000005450 2,3-difluoro-1,4-phenylene group Chemical group [H]C1=C([*:2])C(F)=C(F)C([*:1])=C1[H] 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
- C09K19/44—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing compounds with benzene rings directly linked
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—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
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
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- Organic Chemistry (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Substances (AREA)
Abstract
The invention discloses a liquid crystal composition with negative dielectric anisotropy, high retardation and high transmittance, which comprises the following components in part by weight: 30-85% of one or more compounds of general formula I-1 and/or I-2, based on the total weight of the negative liquid crystal composition; 6-15% by weight of the total negative liquid crystal composition of one or more compounds of formula II; 7-15% by weight of the total negative liquid crystal composition of one or more compounds of formula III; (ii) from 0 to 25% by weight of the total negative liquid crystal composition of one or more compounds of formula iv; and 5-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition. The invention also discloses a liquid crystal display device comprising the liquid crystal composition.
Description
Technical Field
The present invention relates to a liquid crystal composition, and more particularly, to a liquid crystal composition having characteristics such as a high retardation, a high transmittance, good low-temperature stability, a wide nematic phase temperature range, and high optical anisotropy, and a liquid crystal display device including the same.
Background
Liquid crystal display devices have been used in various household electric appliances, measuring devices, panels for automobiles, word processors, electronic notepads, printers, computers, televisions, and the like, from clocks and calculators. Representative liquid crystal display modes include TN (twisted nematic) mode, STN (super twisted nematic) mode, DS (dynamic light scattering) mode, GH (guest host) mode, IPS (in-plane switching) mode, OCB (optically compensated birefringence) mode, ECB (voltage controlled birefringence) mode, VA (vertically aligned) mode, CSH (color super vertical) mode, FLC (ferroelectric liquid crystal) mode, and the like. Further, as a driving method of the liquid crystal display device, a static driving, a multiplex driving, a simple matrix method, an Active Matrix (AM) method of driving by a TFT (thin film transistor), a TFD (thin film diode), or the like can be given.
Among these display systems, the IPS mode, ECB mode, VA mode, CSH mode, and the like have a characteristic of using a liquid crystal composition having a negative dielectric anisotropy Δ ∈. Among these display systems, the VA display system driven by AM is used for display elements (for example, televisions) which require high-speed response and a wide viewing angle.
Liquid crystal materials need to have suitably high dielectric anisotropy, optical anisotropy, and good low-temperature mutual solubility and thermal stability. In addition, the liquid crystal material should also have low viscosity and short response time, low threshold voltage and high contrast. The anisotropy of the composition is further described with reference to a commercially available liquid crystal display device. The temperature range of the nematic phase is associated with the operating temperature range of the element. The upper limit temperature of the nematic phase is preferably 70 ℃ or higher, and the lower limit temperature of the nematic phase is preferably-10 ℃ or lower. The viscosity of the composition correlates to the response time of the element. In order to display animation in the element, it is preferable that the response time of the element is short. Therefore, it is preferable that the viscosity of the composition is small, and it is more preferable that the viscosity of the composition is small at a low temperature.
The optical anisotropy of the composition correlates with the contrast of the device. In order to maximize the contrast ratio of the liquid crystal display device, the optical anisotropy (Δ n) of the liquid crystal composition and the thickness (d) of the liquid crystal layer may be adjusted to be designed. The appropriate product value depends on the kind of operation mode. As is usual, the Δ n · d of the TN mode liquid crystal display is about 0.40, and the Δ n · d of the IPS mode liquid crystal display is about 0.35.
The transmittance and Δ n · d are related as follows:
When the retardation (Δ n · d) is increased, the transmittance of the liquid crystal display is also increased. Thereby achieving the effect of improving the transmittance.
A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, reduce the driving voltage, and further reduce the power consumption.
The liquid crystal display element containing the liquid crystal composition with lower threshold voltage can effectively reduce the power consumption of display, and has longer endurance time particularly in consumables and portable electronic products such as mobile phones and tablet computers.
The liquid crystal composition with low viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, the liquid crystal display element is applicable to animation display. Further, when the liquid crystal composition is injected into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved.
The prior art discloses a liquid crystal composition with low power consumption and fast response, such as patent document CN102858918A, but the prior art has environmental problems (such as use of chlorine-containing compounds), short service life (such as poor UV or thermal stability), low contrast (such as whitening of display screen under sunlight), and cannot balance the performance balance problems of requiring appropriate optical anisotropy, appropriate dielectric anisotropy, high voltage holding ratio, UV stability and high temperature stability in lcd televisions, tablet computers, etc., and cannot simultaneously satisfy all the indexes.
From the preparation angle of the liquid crystal material, various performances of the liquid crystal material are mutually influenced by the influence, and other performances may be changed by the improvement of a certain performance index. Therefore, creative efforts are often required to prepare liquid crystal materials having suitable properties in all aspects.
The liquid crystal material is an important component of the liquid crystal display, and the liquid crystal display has great market demand at present, is mostly used in electronic and electric products, but has a short life cycle. The problem of waste pollution naturally exists in a short life cycle, and under the condition that the current green environmental protection problem is increasingly emphasized by various social circles, if the problem can be controlled from a source, namely, an environment-friendly green material is selected in the modulation process of the liquid crystal material, the environmental cost for treating the waste liquid crystal display can be greatly reduced. Therefore, creative labor is often needed to prepare the liquid crystal material with proper performance in all aspects, economy and environmental protection.
Disclosure of Invention
The invention aims to provide a liquid crystal composition with negative dielectric anisotropy, and the negative liquid crystal composition has the characteristics of high retardation, high transmittance, good low-temperature stability, wide nematic phase temperature range, high optical anisotropy and the like, so that a display device comprising the liquid crystal composition has good display effect.
It is another object of the present invention to provide a display device comprising the liquid crystal composition of negative dielectric anisotropy.
In order to accomplish the above object of the invention, the present invention provides a liquid crystal composition having negative dielectric anisotropy, comprising:
30-85% of one or more compounds of general formula I-1 and/or I-2 based on the total weight of the negative liquid crystal composition
6-15% of one or more compounds of formula II based on the total weight of the negative liquid crystal composition
7-15% of one or more compounds of formula III, based on the total weight of the negative liquid crystal composition
One or more compounds of formula IV in an amount of 0-25% by weight based on the total weight of the negative liquid crystal composition
5-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition
Wherein,
R1、R2、R3、R4、R5、R6、R7、R8、R9and R10The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched, halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
x represents-CH2O-、-CH2CH2-, -COO-, -ident-or single bond
n represents 0 or 1;
a represents 0 or 2, wherein, when a is 2, 2 rings
May be the same or different.
In some embodiments of the invention, it is preferred that R is1、R2、R3、R4、R5、R6、R7、R8、R9And R10The alkyl or alkoxy groups may be the same or different and each independently represents a linear or branched alkyl or alkoxy group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; further preferably said R1、R2、R3、R4、R5、R6、R7、R8、R9And R10The alkyl or alkoxy groups may be the same or different and each independently represents a linear or branched alkyl or alkoxy group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms; the R is4Independently represents a linear or branched alkyl group having 1 to 5 carbon atoms.
In some embodiments of the invention, it is preferred that the
Are the same or different and each independently represents
The above-mentioned
May be substituted by a F atom, wherein
Wherein one or more H atoms may be replaced by F atoms, and the substitution positions are not adjacent.
In some embodiments of the present invention, it is preferred that the compounds of formula I-1 and/or I-2 comprise 30 to 80% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 6-10% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 7-10% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 0 to 20 percent of the total weight of the negative liquid crystal composition; and the compound of the general formula V accounts for 5-45% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compounds of formula I-1 and/or I-2 comprise 30 to 76% by weight of the total negative liquid crystal composition; the compound of the general formula II accounts for 6-8% of the total weight of the negative liquid crystal composition; the compound of the general formula III accounts for 7-9% of the total weight of the negative liquid crystal composition; the compound of the general formula IV accounts for 0 to 15 percent of the total weight of the negative liquid crystal composition; and the compound of the general formula V accounts for 5-40% of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, it is preferred that the compound of formula I-1 is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula I-1 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula I-1 comprises from 10 to 50%, more preferably from 10 to 45%, of the total weight of said negative liquid crystal composition; further preferably 10 to 40%; further preferably 10 to 30%; more preferably 10 to 25%.
In some embodiments of the present invention, it is preferred that the compound of formula I-2 is selected from the group consisting of:
in some embodiments of the present invention, it is particularly preferred that the compound of formula I-2 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula I-2 comprises 15 to 40% by weight of the total negative liquid crystal composition; more preferably 15 to 36%, still more preferably 15 to 25%, still more preferably 15 to 20%.
In some embodiments of the present invention, it is preferred that the compound of formula ii is selected from the group consisting of:
wherein,
R3and R4The same or different, each independently represents a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 5 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the present invention, preferably, the compound of formula ii-1 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula ii-2 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula ii-3 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula ii-4 is selected from one or more compounds of the group consisting of:
in some embodiments of the invention, it is preferred that the compound of formula iii is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula iv is selected from the group consisting of:
wherein,
R7and R8The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms.
In some embodiments of the present invention, it is preferred that the compound of formula IV comprises from 0 to 20% by weight of the total negative liquid crystal composition; further preferably 5 to 20%; more preferably 5 to 15%.
In some embodiments of the present invention, it is preferred that the compound of formula IV-1 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula IV-2 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula IV-3 is selected from the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula IV-4 is selected from the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula v is selected from one or more compounds in the group consisting of:
wherein,
R9and R10The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
In some embodiments of the present invention, preferably, the compound of formula v-1 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula V-1 comprises 20 to 45%, more preferably 25 to 42%, even more preferably 30 to 40% by weight of the total weight of the negative liquid crystal composition.
In some embodiments of the present invention, preferably, the compound of formula v-2 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula v-3 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula v-4 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula v-5 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, preferably, the compound of formula v-6 is selected from one or more compounds of the group consisting of:
in some embodiments of the present invention, it is preferred that the compound of formula V-3 and/or V-5 comprises 0 to 15%, more preferably 0 to 10% by weight of the total weight of the negative liquid crystal composition.
Another aspect of the present invention provides a liquid crystal composition having negative dielectric anisotropy, further comprising one or more additives known to those skilled in the art and described in the literature.
The stabilizers which may be added to the mixtures according to the invention are mentioned below, for example.
Preferably, the stabilizer is selected from the group consisting of the stabilizers shown below.
In the embodiment of the present invention, it is preferable that the stabilizer accounts for 0 to 5% by weight of the total weight of the liquid crystal composition; more preferably, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition; as a particularly preferred scheme, the stabilizing agent accounts for 0.01-0.1% of the total weight of the liquid crystal composition.
In still another aspect of the present invention, there is also provided a liquid crystal display comprising the liquid crystal composition provided by the present invention.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the negative liquid crystal composition provided by the invention has the characteristics of wide nematic phase temperature range, good low-temperature stability, high optical anisotropy and the like, and particularly has a high response speed even at low temperature, so that a display device comprising the liquid crystal composition is particularly suitable for low-temperature working environment.
Unless otherwise specified, the proportions recited in the present invention are by weight and all temperatures are in degrees Celsius.
Detailed Description
The invention will be illustrated below with reference to specific embodiments. It should be noted that the following examples are illustrative of the present invention, and are not intended to limit the present invention. Other combinations and various modifications within the spirit or scope of the present invention may be made without departing from the spirit or scope of the present invention.
The liquid crystal displays used in the following embodiments are all negative liquid crystal display devices, and each of the liquid crystal displays has a cell thickness d of 4 μm and is composed of a polarizer (polarizing plate), an electrode substrate, and the like. The display device is in a normally white mode, i.e. when no voltage difference is applied between the row and column electrodes, a viewer perceives a pixel color that is white. The upper and lower polarizer axes on the substrate are at a 90 degree angle to each other. The space between the two substrates is filled with an optical liquid crystal material.
For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1:
TABLE 1 radical structural code of liquid crystal compounds
Compounds of the following formula are exemplified:
the structural formula is represented by the code listed in Table 2, and can be expressed as: 2PWP3, 2 in the code indicates a left end of-C2H5And 3 represents a right end of-C3H7(ii) a P in the code represents 1, 4-cyclohexylene; w represents 2, 3-difluoro-1, 4-phenylene.
The abbreviated codes of the test items in the following examples are as follows:
wherein the optical anisotropy is obtained by testing an Abbe refractometer under a sodium lamp (589nm) light source at 25 ℃; the dielectric test cell is of the VA6.0 type and has a cell thickness of 6 μm.
Δ ∈ | ∈ | — |, where ∈ | is the dielectric constant parallel to the molecular axis and ∈ | is the dielectric constant perpendicular to the molecular axis, test conditions: the temperature is 25 ℃, the frequency is 1KHz, the test box is VA6.0 type, and the thickness of the box is 6 mu m.
Gamma 1 is obtained by testing a TOYO6254 type liquid crystal physical property evaluation system; the test temperature was 25 ℃ and the test voltage was 90V.
The components used in the following examples can be synthesized by a known method or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds were tested to meet the standards for electronic compounds.
Liquid crystal compositions were prepared according to the compounding ratios of the liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared according to the conventional method in the field, such as heating, ultrasonic wave, suspension and the like, and is mixed according to the specified proportion.
Comparative example 1
The liquid crystal composition of comparative example 1, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared according to the compounds and weight percentages listed in table 2, and the test data are shown in the following table:
TABLE 2 liquid crystal composition formulations and their test properties
Example 1
The liquid crystal composition of example 1 was prepared according to the compounds and weight percentages listed in table 3, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 3 liquid crystal composition formula and its test performance
Example 2
The liquid crystal composition of example 2 was prepared according to the compounds and weight percentages listed in table 4, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 4 liquid crystal composition formula and its test performance
Example 3
The liquid crystal composition of example 3 was prepared according to the compounds and weight percentages listed in table 5, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 5 liquid crystal composition formulations and their test properties
Comparing example 1, example 2, example 3 and comparative example 1, it can be seen that the liquid crystal composition of the present invention has a higher retardation, a higher transmittance, a higher optical anisotropy, a lower viscosity, a good low temperature storage property and a wider nematic phase temperature range, and a liquid crystal display device comprising the liquid crystal composition has a fast response speed and a very good display effect.
Comparative example 2
The liquid crystal composition of comparative example 2, which was filled between two substrates of a liquid crystal display and subjected to a performance test, was prepared with the compounds and weight percentages listed in table 6, and the test data are shown in the following table:
TABLE 6 liquid crystal composition formula and its test performance
Example 4
The liquid crystal composition of example 4 was prepared according to the following compounds and weight percentages in table 7, and filled between two substrates of a liquid crystal display for performance testing, and the test data are shown in the following table:
TABLE 7 liquid crystal composition formulations and their test properties
It can be seen from the comparison of example 4 and comparative example 2 that the liquid crystal composition of the present invention has high optical anisotropy, low viscosity, good low temperature storage property and wide nematic phase temperature range, and the liquid crystal display device comprising the liquid crystal composition has fast response speed and very good display effect.
As can be seen from the above comparative examples and examples, the negative liquid crystal composition of the present invention has high optical anisotropy, low viscosity, good low temperature storage property and wide nematic phase temperature range, and particularly, the liquid crystal composition of the present invention has high retardation and high transmittance, so that a liquid crystal display device comprising the liquid crystal composition has a fast response speed and very good display effect.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and equivalent changes and modifications made according to the spirit of the present invention should be covered thereby.
Claims (9)
1. A liquid crystal composition having negative dielectric anisotropy, comprising:
30-85% of one or more compounds of general formula I-1 and/or I-2, based on the total weight of the negative liquid crystal composition, and 15-20% of compounds of general formula I-2,
6-15% of one or more compounds of formula II based on the total weight of the negative liquid crystal composition
7-15% of one or more compounds of formula III, based on the total weight of the negative liquid crystal composition
5-20% by weight of the total negative liquid crystal composition of one or more compounds of formula IV-4:
5-50% of one or more compounds of formula V, based on the total weight of the negative liquid crystal composition
Wherein,
R1、R2、R9and R10The same or different, each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms, a linear or branched, halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 12 carbon atoms;
R3、R4、R5and R6The alkyl or alkoxy groups are the same or different and each independently represents a linear or branched, halogenated or unhalogenated alkyl or alkoxy group having 1 to 12 carbon atoms;
R7and R8The same or different, each independently represents a linear or branched alkyl group or alkoxy group having 1 to 12 carbon atoms, an alkenyl group or alkenyloxy group having 2 to 12 carbon atoms;
a represents 0 or 2, wherein, when a is 2, 2 rings
May be the same or different.
2. The negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the compound of formula i-1 is selected from the group consisting of:
3. the negative dielectric anisotropy liquid crystal composition according to claim 1, wherein the compound of formula i-2 is selected from the group consisting of:
4. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula ii is selected from the group consisting of:
wherein,
R3and R4The same or different, each independently represents a linear or branched halogenated or unhalogenated alkyl or alkoxy group having 1 to 5 carbon atoms, a linear or branched halogenated or unhalogenated alkenyl or alkenyloxy group having 2 to 5 carbon atoms.
5. The negative dielectric anisotropy liquid crystal composition according to claim 4, wherein the compound of formula II-1 is one or more compounds selected from the group consisting of:
the compound of the general formula II-2 is one or more compounds selected from the group consisting of:
the compound of the general formula II-3 is one or more compounds selected from the group consisting of:
the compound of formula II-4 is selected from one or more compounds of the group consisting of:
6. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula iii is selected from the group consisting of:
7. the negative dielectric anisotropy liquid crystal composition of claim 1, wherein the compound of formula v is one or more compounds selected from the group consisting of:
wherein,
R9and R10The same or different, each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms.
8. A liquid crystal composition having negative dielectric anisotropy comprising the liquid crystal composition according to any one of claims 1 to 7, characterized in that the liquid crystal composition further comprises one or more additives.
9. A liquid crystal display comprising the liquid crystal composition of claim 8.
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