CN114106850B - Positive liquid crystal composition and application thereof in liquid crystal display device - Google Patents
Positive liquid crystal composition and application thereof in liquid crystal display device Download PDFInfo
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- 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 invention discloses a positive liquid crystal composition and application thereof in a liquid crystal display device, wherein the liquid crystal composition comprises: the compound of the general formula I accounts for 0.01-60% of the total weight of the liquid crystal composition, the compound of the general formula II accounts for 1-60% of the total weight of the liquid crystal composition, the compound of the general formula III accounts for 1-60% of the total weight of the liquid crystal composition, and the compound of the general formula IV accounts for 0.1-40% of the total weight of the liquid crystal composition. The liquid crystal composition has the advantages of high bright point, low lower limit temperature of liquid crystal phase, low rotary viscosity, large elastic constant and the like, the anisotropy of the dielectric constant is positive, the refractive index anisotropy and the dielectric anisotropy value are moderate, and the response time of a liquid crystal display can be reduced, so that the problem of low response speed of the existing liquid crystal display device is solved, and the liquid crystal composition is suitable for TN-TFT, IPS, FFS and other types of liquid crystal display devices.
Description
Technical Field
The invention belongs to the field of liquid crystal display materials, and particularly relates to a positive liquid crystal composition and application thereof in a liquid crystal display device.
Background
The liquid crystal material is a mixture of organic rod-like small molecular compounds which have liquid fluidity and crystal anisotropy at a certain temperature, and is widely applied to liquid crystal display elements of devices such as automobile instruments, televisions, computers, word processors and the like due to the characteristics of optical anisotropy and dielectric anisotropy. Liquid crystal materials are generally used as a mixture of a plurality of components to exhibit characteristics that are difficult to exert by a single compound, and it is important that the liquid crystal compound as a component of the liquid crystal composition has good chemical and physical stability, a high clearing point, a low lower limit temperature of a liquid crystal phase, and appropriate dielectric anisotropy and refractive index anisotropy, and is well miscible with other liquid crystal compounds in the composition.
LCD displays, which are the most popular displays, have one of the most important properties of accurately reproducing moving images, and if the response speed of the liquid crystal composition used is too slow, the display may be left with afterimages, thereby affecting the appearance. The physical parameters that substantially determine the response time of the liquid crystal mixture are the rotational viscosity γ 1 and the elastic constant, which is also particularly important to ensure a good black state of the LCD, and generally the clearing point and the rotational viscosity of the liquid crystal composition increase with increasing elastic constant. Especially in LC displays for TV and video applications (e.g. LCD TV, monitor, PDA, notebook, game console), the demand for response time is higher. The response time can theoretically be accelerated by reducing the layer thickness d of the liquid-crystalline medium in the LC panel ("panel gap"), but to maintain a suitable optical retardation (d · Δ n), a liquid-crystalline composition with a higher birefringence Δ n is required, whereas highly birefringent liquid-crystalline materials known from the prior art usually also have a high rotational viscosity, which in turn affects the response time of the liquid-crystalline composition. Therefore, in the field of liquid crystal materials, there is a need for a novel liquid crystal composition with improved properties, which has both higher birefringence and low rotational viscosity, so as to improve the response rate of the liquid crystal display device.
Disclosure of Invention
The invention provides a positive liquid crystal composition with a substituted cyclohexenyl compound in order to overcome the defects and shortcomings of the prior art, and obtains the liquid crystal composition with stable physicochemical property, good low-temperature intersolubility, low rotary viscosity, large elastic constant and moderate refractive index anisotropy and dielectric anisotropy values by optimizing the components and the proportion in the liquid crystal composition.
In order to solve the technical problems, the invention provides the following technical scheme:
the first aspect of the present invention provides a positive liquid crystal composition comprising the following compounds:
(1) 0.01-60% of compound of general formula I in total weight of liquid crystal composition
(2) 1-60% of compound of general formula II based on total weight of liquid crystal composition
(3) 1-60% of compound of formula III based on total weight of liquid crystal composition
(4) 0.1-40% of compound of formula IV in total weight of liquid crystal composition
Wherein L is 1 represents-H, halogen substituted or unsubstituted C1-C12 alkyl, halogen substituted or unsubstituted C1-C12 alkoxy, or halogen substituted or unsubstituted C2-C12 alkenyl; or, L 1 Represents a halogen substituted or unsubstituted C1-C12 alkyl group, a halogen substituted or unsubstituted C1-C12 alkoxy group, or a halogen substituted or unsubstituted C2-C12 alkenyl group, one or more-CH groups among the alkyl, alkoxy or alkenyl groups 2 -each independently is substituted by-O-, -CH = CH-, -C ≡ C-, -CO-O-or-O-CO-in such a way that the oxygen atoms are not directly linked;
L 2 represents-H, halogen substituted or unsubstituted C1-C12 alkyl, or halogen substituted or unsubstituted C1-C12 alkoxy; or, L 2 Represents a halogen substituted or unsubstituted C1-C12 alkyl group, or a halogen substituted or unsubstituted C1-C12 alkoxy group, one or more-CH's in the alkyl or alkoxy group 2 -each independently is substituted by-O-, -CH = CH-, -C ≡ C-, -CO-O-or-O-CO-in such a way that the oxygen atoms are not directly linked;
L 3 represents-CF 3 Or, a fluorine substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms;
rings A and B each independently represent
Z 1 、Z 2 Each independently of the other represents a single bond, -CH 2 O-、-CF 2 O-、-CH 2 CH 2 -、
X 1 、X 2 Each independently of the other represents hydrogen or fluorine;
m, n each independently of the other represent 0 or 1;
R A1 、R A2 each independently represents a C1-C12 alkyl group, a C1-C12 alkoxy group or a C2-C12 alkenyl group;
ring A 1 、A 2 Each independently of the other
Z A represents-CH 2 CH 2 -、-CH＝CH-、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-CH 2 CH 2 -, -CF = CF-or a single bond;
R B1 represents a C1-C12 alkyl group, a C1-C12 alkoxy group or a C2-C12 alkenyl group;
R B2 represents C1-C12 alkyl, C1-C12 alkoxy, C2-C12 alkenyl, -F, -Cl, -OCF 3 or-CF 3 ；
Ring B 1 、B 2 Each independently of the other
L B1 、L B2 Each independently of the other represents-H, -F, -Cl, -OCF 3 or-CF 3 ；
Z B1 、Z B2 Each independently of the other represents-CH 2 CH 2 -、-CH＝CH-、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-CF 2 CF 2 -, -CF = CF-or a single bond;
R 41 、R 42 each independently of the other represents C1-C12 alkyl, C1-C12 alkoxy, -F, -Cl, -OCF 3 or-CF 3 ；
Ring C 1 、C 2 、C 3 、C 4 Each independently of the other
Z 41 、Z 42 、Z 43 Each independently of the other represents-CH 2 CH 2 -、-CH＝CH-、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-CF 2 CF 2 -, -CF = CF-, or a single bond.
Further, the compound of the general formula I accounts for 0.01-50% of the total weight of the liquid crystal composition; the compound of the general formula II accounts for 5-50% of the total weight of the liquid crystal composition; the compound of the general formula III accounts for 5-50% of the total weight of the liquid crystal composition; the compound of the general formula IV accounts for 0.5-40% of the total weight of the liquid crystal composition.
Further, the compound of the general formula I accounts for 0.01-40% of the total weight of the liquid crystal composition.
Further, the compound of the general formula I is selected from one or more compounds in the following general formulas I-A-I-P:
wherein R is 1 represents-H, a halogen substituted or unsubstituted C1-C5 alkyl group, or a halogen substituted or unsubstituted C1-C5 alkoxy group; or, R 1 Represents a halogen substituted or unsubstituted C1-C5 alkyl group, or a halogen substituted or unsubstituted C1-C5 alkoxy group, one or more-CH's in the alkyl or alkoxy group 2 -each independently is substituted by-O-, -CH = CH-, -C ≡ C-, -CO-O-or-O-CO-in such a way that the oxygen atoms are not directly linked;
R 2 represents-H, halogen substituted or unsubstituted C1-C5 alkyl, or halogen substituted or unsubstituted C1-C5 alkoxy; or, R 2 Represents a halogen substituted or unsubstituted C1-C5 alkyl group, or a halogen substituted or unsubstituted C1-C5 alkoxy group, one or more-CH's in the alkyl or alkoxy group 2 -each independently is substituted by-O-, -CH = CH-, -C ≡ C-, -CO-O-or-O-CO-in such a way that the oxygen atoms are not directly linked;
X 1 、X 2 each independently of the other represents hydrogen or fluorine.
Further, the compound of the general formula I is selected from one or more of the following compounds:
further, the compound of formula II is selected from one or more of the following compounds:
further, the compound of formula III is selected from one or more of the following compounds:
further, the compound of formula IV is selected from one or more of the following compounds:
further, the compound of formula I in the liquid crystal composition is preferably one or more of the compounds shown in the formulas I-23, I-30, I-40, I-41, I-43, I-44, I-48, I-50 and I-68.
Further, the compound of formula II in the liquid crystal composition is preferably one or more of the compounds shown in the formulas II-12, II-14, II-15 and II-33.
Further, the compound of formula III in the liquid crystal composition is preferably one or more of the compounds represented by the above formulae III-15, III-16, III-18, III-23, III-89, III-93, III-98, III-104, III-105, III-109, and III-112 to III-117.
Further, the compound of formula IV in the liquid crystal composition is preferably one or more of the compounds represented by the above formulae IV-53, IV-54, IV-57, IV-58, IV-61 to IV-64, IV-69, IV-74 and IV-75.
The second aspect of the present invention provides a liquid crystal composition according to the first aspect for use in a liquid crystal display device.
Further, the liquid crystal display device comprises VA, MVA, PVA, PSVA, TN-TFT, IPS and FFS mode liquid crystal display devices.
Further, the liquid crystal display device is preferably an IPS or FFS mode liquid crystal display device.
Further, the liquid crystal display device includes an upper substrate and a lower substrate, wherein at least one of the substrates has one or two electrodes thereon, and at least one of the substrates is relatively light-transparent.
Compared with the prior art, the invention has the beneficial effects that:
1. the positive liquid crystal composition provided by the invention comprises one or more compounds containing trifluoromethyl substituted cyclohexenyl in the formula I, and the compounds have larger elastic constants and good low-temperature intersolubility with compounds in the formulae II, III, IV and the like in the composition.
2. The positive liquid crystal composition composed of the compounds of the formulas I, II, III and IV has the advantages of stable physical and chemical properties, good low-temperature intersolubility, low rotational viscosity, large elastic constant, low lower limit temperature of a liquid crystal phase and the like, and the dielectric anisotropy and the refractive index anisotropy are moderate, so that the low-temperature working effect of a liquid crystal display device can be improved, the low-temperature working range is enlarged, and the contrast and the response speed of the liquid crystal display are improved.
Detailed Description
The present invention is further described below with reference to specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.
The liquid crystal displays used in the following examples and comparative examples, each of which is an IPS liquid crystal display device, were subjected to a performance test by filling a liquid crystal composition between two substrates of a liquid crystal device, wherein the abbreviated symbols of the test items are as follows:
cp: clearing point (nematic-isotropic phase transition temperature);
Δ n: refractive index anisotropy (589nm, 25 ℃);
Δ ε: dielectric anisotropy (test condition: 1K Hz,25 ℃);
γ 1 : represents the rotational viscosity [ mPas ] measured at 25 DEG C]；
K11: splay elastic constant (pN, 25 ℃ C.)
K33: flexural modulus of elasticity constant (pN, 25 ℃ C.)
Wherein Δ ε = ε || -ε ⊥ Wherein epsilon || Is the dielectric constant, ε, parallel to the molecular axis ⊥ Is the dielectric constant perpendicular to the molecular axis.
The compounds of formula I used in the following examples were prepared by the following preparation methods:
synthesis of Compounds of formula I-40:
36.6g 100mmol of 4 '-propyl-4- (4- (trifluoromethyl) phenyl) - [1,1' -bis (cyclohexane) ] -3-one, 110mmol of trimethyl (trifluoromethyl) silane and 100mmol of tetrabutylammonium fluoride are added to 500mL of THF, the reaction is stirred for 2 hours while cooling to 0 ℃ and the crude product is isolated. The crude product was dissolved in 200mL of THF, 18g of diethylaminosulfur trifluoride was added, the mixture was refluxed for 3 hours, and the separated solid was recrystallized and subjected to column chromatography to obtain 29.2g of a compound of the formula I-40, GC 99.9%, GC-MS: E/Z =418.2.
1 H NMR(500MHz,CDCl 3 )δ7.73-7.67(m,2H),7.47-7.41(m,2H),2.85-2.68(m,2H),2.46-2.35(m,2H),1.99(tdt,J＝8.8,7.3,5.9Hz,1H),1.89-1.13(m,19H),0.90(t,J＝7.5Hz,3H)。
Synthesis of Compounds of formula I-48:
36.6g 100mmol of 4 '-propyl-4- (4- (trifluoromethoxy) phenyl) - [1,1' -bis (cyclohexane) ] -3-one, 110mmol of trimethyl (trifluoromethyl) silane and 100mmol of tetrabutylammonium fluoride were added to 500mL of THF, the reaction was stirred for 2 hours while cooling to 0 ℃ and the crude product was isolated. The crude product was dissolved in 200mL of THF, 18g of diethylaminosulfur trifluoride was added, the mixture was refluxed for 3 hours, and the isolated solid was recrystallized and subjected to column chromatography to obtain 30.1g of a compound of formula I-48, GC 99.9%, GC-MS: E/Z =434.2.
1 H NMR(500MHz,CDCl 3 )δ7.56-7.39(m,1H),7.28-7.02(m,1H),2.93-2.59(m,1H),2.56-2.23(m,1H),2.12-1.08(m,10H),0.90(t,J＝7.5Hz,1H)。
Other compounds of formula I can be synthesized in a similar manner by substituting the starting materials and the corresponding trimethylsilane.
Example 1
The liquid crystal composition provided by the embodiment comprises the following components:
(1) 4.5 percent of compound of formula I-40 based on the total weight of the liquid crystal composition;
(2) 59.5% by weight of the total liquid crystal composition of a compound of formula II: 48.5% of formula II-12, 5% of formula II-15 and 6% of formula II-33, respectively;
(3) 29% by weight of the total liquid crystal composition of a compound of formula III: 5% of formula III-16, 3% of formula III-115, 15% of formula III-116, 2% of formula III-117 and 4% of formula III-93, respectively;
(4) 7% by weight of the total liquid crystal composition of a compound of formula IV: 1% of IV-53 and 6% of IV-63 compounds, respectively.
Example 2
The present embodiment provides a liquid crystal composition comprising the following components:
(1) 18.5% by weight of the total liquid crystal composition of a compound of formula I: comprising formula 7.5% of I-48 and 11% of a compound of formula I-40;
(2) 49.5% by weight of the total liquid crystal composition of a compound of formula II: 40% of formula II-12, 2% of formula II-15 and 7.5% of formula II-33, respectively;
(3) 31.5% by weight of the total liquid crystal composition of a compound of formula III: 3% of formula III-93, 10% of formula III-112, 10.5% of formula III-113 and 8% of formula III-114, respectively;
(4) 0.5% by weight of the total liquid crystal composition of a compound of formula IV-54.
Example 3
The present embodiment provides a liquid crystal composition comprising the following components:
(1) 6% by weight of the total liquid crystal composition of a compound of formula I-68;
(2) 50% by weight of the total liquid crystal composition of a compound of formula II: 34% of formula II-12, 6% of formula II-15 and 10% of formula II-33, respectively;
(3) 40.5% by weight of the total liquid crystal composition of a compound of formula III: 2% of formula III-16, 4% of formula III-18, 6.5% of formula III-98, 10% of formula III-105, 7% of formula III-112 and 11% of formula III-113, respectively;
(4) 3.5% by weight of the total liquid crystal composition of a compound of formula IV: 3% of IV-64 and 0.5% of IV-53 respectively.
Example 4
The present embodiment provides a liquid crystal composition comprising the following components:
(1) 7% by weight of the total liquid crystal composition of a compound of formula I-50;
(2) 50% by weight of the total liquid crystal composition of a compound of formula II: 44% of formula II-12 and 6% of formula II-15, respectively;
(3) 15% by weight of the total liquid crystal composition of a compound of formula III: 7% of formula III-16, 5% of formula III-109, 3% of formula III-105, respectively;
(4) 28% by weight of the total liquid crystal composition of a compound of formula IV: respectively 6% IV-58, 4% IV-64, 6% IV-63, 6% IV-69 and 6% IV-75.
Example 5
The present embodiment provides a liquid crystal composition comprising the following components:
(1) 6% by weight of the total liquid crystal composition of a compound of formula I-44;
(2) 45% by weight of the total liquid crystal composition of a compound of formula II: 26% of formula II-12, 9% of formula II-14 and 10% of formula II-15, respectively;
(3) 34% by weight of the total liquid crystal composition of a compound of formula III: 11% of formula III-16, 8% of formula III-23, 2% of formula III-89, 3% of formula III-98 and 10% of formula III-116, respectively;
(4) 15% by weight of the total liquid crystal composition of a compound of formula IV: respectively 7% IV-62, 2% IV-63 and 6% IV-69.
Example 6
The present embodiment provides a liquid crystal composition comprising the following components:
(1) 13.5% by weight of the total liquid crystal composition of a compound of formula I: comprising formula 5% of I-23, formula 3.5% of I-30, and formula 5% of a compound of formula I-41;
(2) 59.5% by weight of the total liquid crystal composition of a compound of formula II: 44% of formula II-12, 10% of formula II-15 and 5.5% of formula II-33, respectively;
(3) 16% by weight of the total liquid crystal composition of a compound of formula III: 10% of formula III-15 and 6% of formula III-116, respectively;
(4) 11% by weight of the total liquid crystal composition of a compound of formula IV: respectively 0.5% of IV-54, 4.5% of IV-57 and 6% of IV-61.
Example 7
The liquid crystal composition provided by the embodiment comprises the following components:
(1) I-43 accounting for 6 percent of the total weight of the liquid crystal composition;
(2) 59.5% by weight of the total liquid crystal composition of a compound of formula II: 47% of formula II-44, 10.5% of formula II-15 and 2% of formula II-33, respectively;
(3) 24% by weight of the total liquid crystal composition of a compound of formula III: 6% of formula III-15, 7% of formula III-18 and 11% of formula III-115, respectively;
(4) 10.5% by weight of the total liquid crystal composition of a compound of formula IV: respectively 0.5% IV-54, 5% IV-57 and 5% IV-61.
Example 8
The present embodiment provides a liquid crystal composition comprising the following components:
(1) I-41 accounting for 4 percent of the total weight of the liquid crystal composition;
(2) 49% by weight of the total liquid crystal composition of a compound of formula II: 35% of formula II-12, 5% of formula II-15 and 9% of formula II-33, respectively;
(3) 36% by weight of the total liquid crystal composition of a compound of formula III: 3% of formula III-15, 4% of formula III-104, 10% of formula III-112, 7% of formula III-113 and 12% of formula III-114, respectively;
(4) 11% by weight of the total liquid crystal composition of a compound of formula IV: respectively 0.5% IV-54, 3% IV-61, 4% IV-69 and 3.5% IV-74.
Comparative example 1
This comparative example uses compounds of formulas III-109 in place of the compounds of formulas I-40 of example 1, with the remaining components and proportions unchanged.
Comparative example 2
This comparative example replaces 40% of the formula II-12, 2% of the formula II-15 and 7.5% of the formula II-33 of example 2 with 40% of the formula III-1, 2% of the formula III-15 and 7.5% of the formula III-18, the other components and proportions being unchanged.
Comparative example 3
This comparative example replaces 7% of the formula III-16, 5% of the formula III-109 and 3% of the formula III-105 of example 4 with 7% of the formula II-17, 5% of the formula II-29 and 3% of the formula II-33, the remaining components and proportions being unchanged.
Comparative example 4
This comparative example replaces 7% IV-62, 2% IV-63 and 6% IV-69 of example 5 with 7% III-89, 2% III-93 and 6% III-99, the remaining components and proportions being unchanged.
Performance testing and comparison
The liquid crystal compositions prepared in examples 1 to 8 and comparative examples 1 to 4 were filled between two substrates of a display, respectively, and Cp, Δ n, Δ ε, and γ for the constructed liquid crystal display 1 K11, K33 and low temperature storage crystallization properties were tested and studied.
(1) Effect of compounds of formula I on liquid crystal composition properties: the test data of the liquid crystal display of the liquid crystal composition described in example 1 and comparative example 1 are shown in the following table 1:
TABLE 1 Performance test parameters of liquid Crystal display comprising the liquid Crystal composition of example 1 or comparative example 1
| Test item | Example 1 | Comparative example 1 |
| Cp(℃) | 75 | 75 |
| Δn | 0.118 | 0.120 |
| Δε | 2.2 | 2.4 |
| γ 1 | 44 | 52 |
| Storage at-30 deg.C | Does not crystallize in 10 days | Crystallization for 7 days |
| K11 | 14.3 | 13.9 |
| K33 | 14.8 | 13.8 |
As can be seen from the performance test data in Table 1, the liquid crystal composition added with the compound I-40 has a significantly reduced rotational viscosity, while the refractive index anisotropy and the dielectric anisotropy are only slightly reduced, and furthermore, the elastic constant (K33/K11) of the liquid crystal composition of example 1 is increased compared with that of comparative example 1, and the liquid crystal composition does not crystallize after being stored at-30 ℃ for 10 days, which is beneficial to improving the low temperature operation effect of the liquid crystal display device and increasing the low temperature operation range.
(2) Effect of compounds of formula II on the properties of liquid crystal compositions: the test data of the liquid crystal display of the liquid crystal composition described in example 2 and comparative example 2 are shown in the following table 2:
table 2 parameters for the Performance test of a liquid Crystal display comprising the liquid Crystal composition of example 2 or comparative example 2
| Test items | Example 2 | Comparative example 2 |
| Cp(℃) | 78.5 | 88 |
| Δn | 0.117 | 0.135 |
| Δε | 2.3 | 2.5 |
| γ 1 | 49 | 78 |
| Storage at-30 deg.C | Does not crystallize in 10 days | 1 day crystallization |
| K11 | 14.9 | 12.4 |
| K33 | 15.1 | 12.9 |
As can be seen from the performance test data in Table 2 above, the liquid crystal composition of comparative example 2, which does not contain the compound of formula II, has a significant increase in rotational viscosity, and is crystallized upon standing at-30 ℃ for 1 day, indicating that the presence of the compound of formula II reduces the viscosity while increasing the crystallization temperature of the liquid crystal composition.
(3) Effect of the compound of formula III on the properties of liquid crystal compositions: the test data of the liquid crystal displays of the liquid crystal compositions described in example 4 and comparative example 3 are shown in table 3 below:
table 3 parameters for Performance test of liquid Crystal display comprising liquid Crystal composition of example 4 or comparative example 3
| Test items | Example 4 | Comparative example 3 |
| Cp(℃) | 78.5 | 68.5 |
| Δn | 0.100 | 0.085 |
| Δε | 9.4 | 6.3 |
| γ 1 | 62 | 56 |
| Storage at-30 deg.C | Does not crystallize in 10 days | 5 days devitrification |
| K11 | 13.3 | 12.5 |
| K33 | 15.4 | 13.8 |
As can be seen from the performance test data in Table 3 above, the liquid crystal composition of comparative example 3, which does not contain the compound of formula III, has a lower dielectric anisotropy value and clearing point, and is easily crystallized at low temperature, although the rotational viscosity is slightly lower than that of example 4.
(4) Effect of compounds of formula IV on liquid crystal composition properties: the test data of the liquid crystal displays of the liquid crystal compositions described in example 5 and comparative example 4 are shown in table 4 below:
table 4 Performance test parameters of liquid Crystal display comprising liquid Crystal composition of example 5 or comparative example 4
| Test items | Example 5 | Comparative example 4 |
| Cp(℃) | 105 | 99 |
| Δn | 0.119 | 0.123 |
| Δε | 5.2 | 3.8 |
| γ 1 | 85 | 89 |
| Storage at-30 deg.C | Does not crystallize in 10 days | 3 days crystallization |
| K11 | 19.7 | 14.3 |
| K33 | 19.4 | 16.2 |
As can be seen from the performance test data in Table 4 above, the liquid crystal composition of comparative example 4, which does not contain the compound of formula IV, has an adverse effect on the rotational viscosity, dielectric anisotropy, clearing point, and crystallization properties.
The test data for the liquid crystal displays constructed from the different liquid crystal compositions of example 3 and examples 6-8 are shown in table 5 below:
TABLE 5 Performance test parameters for liquid Crystal displays comprising different liquid Crystal compositions
| Test items | Example 3 | Example 6 | Example 7 | Example 8 |
| Cp(℃) | 74.5 | 81 | 75.4 | 78.4 |
| Δn | 0.131 | 0.125 | 0.094 | 0.149 |
| Δε | 5.3 | 2.9 | 2.7 | 3.8 |
| γ 1 | 54 | 49 | 48 | 52 |
| Storage at-30 deg.C | Does not crystallize in 10 days | Does not crystallize in 10 days | Does not crystallize in 10 days | Does not crystallize in 10 days |
| K11 | 15.8 | 15.5 | 14.7 | 13.4 |
| K33 | 15.2 | 17.2 | 16.3 | 14.2 |
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. A positive liquid crystal composition, characterized in that it comprises the following compounds:
(1) The compound of the general formula I accounts for 4-40% of the total weight of the liquid crystal composition
(2) 45-60% of compound of general formula II based on total weight of liquid crystal composition
(3) 15-50% of compound of general formula III based on total weight of liquid crystal composition
(4) 0.5-40% of compound of general formula IV in total weight of liquid crystal composition
Wherein the sum of all liquid crystal components in the liquid crystal composition is 100 percent;
L 1 represents-H, a halogen substituted or unsubstituted C1-C12 alkyl group;
L 2 represents-H, halogen substituted or unsubstituted C1-C12 alkyl, or halogen substituted or unsubstituted C1-C12 alkoxy;
L 3 denotes-CF 3 ；
Rings A and B each independently represent
Z 1 、Z 2 Each independently represents a single bond, -CF 2 O-、
X 1 、X 2 Each independently represents hydrogen or fluorine;
m and n each independently represent 0 or 1;
R A1 、R A2 each independently represents a C1-C12 alkyl group or a C2-C12 alkenyl group;
ring A 1 、A 2 Each independently represent
Z A Represents a single bond;
R B1 represents a C1-C12 alkyl group or a C2-C12 alkenyl group;
R B2 represents C1-C12 alkyl, C1-C12 alkoxy, -F or-OCF 3 ；
Ring B 1 、B 2 Each independently represent
L B1 、L B2 Each independently represents-H or-F;
Z B1 、Z B2 each independently represents-CF 2 O-、-OCF 2 -or a single bond;
and when R is B1 Is butenyl, R B2 Is methyl, ethyl or propyl, ring B 1 Is composed of
L B1 、L B2 Are all-H, Z B1 、Z B2 When all are single bonds, ring B 2 Is composed of
R 41 、R 42 Each independently represents a C1-C12 alkyl group or-F;
ring C 1 、C 2 、C 3 、C 4 Each independently represent
Z 41 、Z 42 、Z 43 Each independently represents-CF 2 O-、-OCF 2 -or a single bond.
2. A positive-working liquid crystal composition according to claim 1, wherein the compound of formula I is selected from one or more compounds of the following formulae:
wherein R is 1 represents-H, a halogen substituted or unsubstituted C1-C5 alkyl group;
R 2 represents-H, halogen substituted or unsubstituted C1-C5 alkyl, or halogen substituted or unsubstituted C1-C5 alkoxy;
X 1 、X 2 each independently of the other represents hydrogen or fluorine.
3. A positive working liquid crystal composition according to claim 1, wherein the compound of formula I is selected from one or more of the following compounds;
4. a positive working liquid crystal composition according to claim 3, wherein the compound of formula I is selected from one or more compounds of formulae I-23, I-30, I-40, I-41, I-43, I-44, I-48, I-50 and I-68.
5. A positive-working liquid crystal composition according to claim 1, wherein the compound of formula II is selected from one or more of the following compounds:
6. a positive-working liquid crystal composition according to claim 1, wherein the compound of formula III is selected from one or more of the following compounds:
7. a positive-working liquid crystal composition according to claim 1, wherein the compound of formula IV is selected from one or more of the following compounds:
8. use of the positive liquid crystal composition according to any one of claims 1 to 7 in a liquid crystal display device comprising a VA, MVA, PVA, PSVA, TN-TFT, IPS, FFS type liquid crystal display device.
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| KR100821844B1 (en) * | 2005-01-13 | 2008-04-11 | 주식회사 엘지화학 | Liquid crystal composition comprising novel silicon containing compounds and liquid crystal display device using the same |
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| WO1996006073A1 (en) * | 1994-08-18 | 1996-02-29 | Wojskowa Akademia Techniczna | Liquid crystal materials |
| WO1998011173A1 (en) * | 1996-09-12 | 1998-03-19 | Samsung Display Devices Co., Ltd. | Liquid crystal materials |
| JPH10236989A (en) * | 1997-02-27 | 1998-09-08 | Chisso Corp | Liquid crystal compound having negative anisotropic value of dielectric constant, liquid crystal composition containing the same and liquid crystal display element using the composition |
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