CN115895678A - Dielectric positive liquid crystal composition and liquid crystal display - Google Patents
Dielectric positive liquid crystal composition and liquid crystal display Download PDFInfo
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- CN115895678A CN115895678A CN202211362926.6A CN202211362926A CN115895678A CN 115895678 A CN115895678 A CN 115895678A CN 202211362926 A CN202211362926 A CN 202211362926A CN 115895678 A CN115895678 A CN 115895678A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 117
- 239000000203 mixture Substances 0.000 title claims abstract description 106
- 150000001875 compounds Chemical class 0.000 claims abstract description 63
- 239000003381 stabilizer Substances 0.000 claims description 10
- 125000006710 (C2-C12) alkenyl group Chemical group 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 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 5
- 239000002019 doping agent Substances 0.000 claims description 4
- 239000000975 dye Substances 0.000 claims description 3
- 125000006732 (C1-C15) alkyl group Chemical group 0.000 claims description 2
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 27
- 239000000758 substrate Substances 0.000 description 17
- 239000012071 phase Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000004305 biphenyl Substances 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 101100208473 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) lcm-2 gene Proteins 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a dielectric positive liquid crystal composition and a liquid crystal display, and belongs to the technical field of liquid crystal display. The dielectric positive liquid crystal composition comprises at least one compound shown as a general formula I, at least one compound shown as a general formula F, at least one compound shown as a general formula N and at least one compound shown as a general formula D. The liquid crystal composition has good low-temperature storage phase change point and high photo-thermal stability under the condition of maintaining proper optical anisotropy, proper clearing point and proper dielectric anisotropy, so that a liquid crystal display device comprising the liquid crystal composition has a wide use temperature range, high response speed, good transmittance, low image residue and poor quality under the condition of maintaining proper threshold voltage, and has high application value in TN mode, IPS mode and FFS mode liquid crystal displays.
Description
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a dielectric positive liquid crystal composition and a liquid crystal display.
Background
Since the discovery, liquid crystal molecules have been widely used in various display modes due to their unique optical and electrical properties. By applying different voltages, the rotation angle of the liquid crystal molecules can be controlled, and different transmittances can be obtained. A liquid crystal composition having a negative dielectric Δ ∈ is used for a vertical alignment display, and a liquid crystal composition having a positive dielectric constant is used for a horizontal alignment display such as a TN type, an STN type, or an IPS type. In addition, a driving method in which a liquid crystal composition having positive Δ ∈ is vertically aligned when no voltage is applied and display is performed by applying a lateral electric field has been reported, and the necessity of a liquid crystal composition having positive Δ ∈ is further increased. On the other hand, in all driving methods, low-voltage driving, high-speed response, and a wide operating temperature range are required. That is, it is required that Δ ε is positive, the absolute value is large, and the viscosity γ is 1 Small, nematic isotropic liquid phase transition temperature (C) p ) High. In addition, it is necessary to design appropriate Δ n and cell thickness (cell gap) d so that the liquid crystal display device has an appropriate retardation amount (Δ n.d), and high-speed response is emphasized in the case of using the liquid crystal display device for a television or the like, and thus γ is required 1 A small liquid crystal composition.
Generally, the retardation (Δ n.d) of a liquid crystal device is designed to be kept within a certain range, and a liquid crystal composition having a large absolute value of dielectric anisotropy and a large refractive index has a high rotational viscosity, and in order to increase the response speed, it is possible to reduce the thickness of the liquid crystal device, that is, to reduce the cell gap (d), which requires a liquid crystal composition having a high birefringence Δ n. Paradoxically, liquid crystal compositions with high birefringence generally have a low rotational viscosity, and the low temperature miscibility of the components therein is also poor.
Disclosure of Invention
The invention aims to provide a liquid crystal phase with wide temperature range, small viscosity, high birefringence, good solubility at low temperature, high specific resistance and voltage holding ratio, and thermal and optical stability.
The invention also provides a liquid crystal display component which is obtained by using the liquid crystal composition and has excellent display quality and is not easy to generate afterimage.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a dielectric positive liquid crystal composition, which comprises the following components in part by weight:
(1) At least one compound of formula I:
wherein R is 1 Represents H, halogen or C 1 -C 15 Alkyl groups of (a); x 1 、X 2 One is F and the other is H; m represents an integer of 1 to 8;
(2) At least one compound of formula F:
wherein the rings B1 and B2 are independent of each other
One or more of H on (a) may be substituted by F;
R B1 、R B2 independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl of (a);
L B1 、L B2 independently of one another, F, cl, CH 3 Or CF 3 ；
b represents 0 or 1;
(3) At least one compound of the formula N:
wherein R is C1 、R C2 Independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl of (a);
ring C1 and ring C2 independently represent
And at least one of the rings C1 and C2 is
Up to one H is substituted by F;
c. d is independently of each other 0, 1 or 2;
Z C1 、Z C2 independently of one another, a carbon-carbon single bond, -CH 2 CH 2 -、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-CF 2 CF 2 -or-CF = CF-;
(4) At least one compound of formula D:
wherein R is D1 、R D2 Independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl groups of (a).
Further, the compound shown in the general formula I is selected from one or more of the following compounds:
in a preferred embodiment of the invention, the compound of formula I is selected from one or more of the following compounds:
in the invention, in the dielectric positive liquid crystal composition, the weight percentage range of the compound in the general formula I is 1-50%. The lower limit of the weight percentage of the compound of formula I may be 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24% or 26% relative to the total weight of the liquid crystal composition; the upper limit of the weight percentage of the compound of formula I may be 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10% relative to the total weight of the liquid crystal composition of the present invention.
Further, the compound shown in the general formula F is selected from one or more of the following compounds:
in the invention, in the dielectric positive liquid crystal composition, the weight percentage range of the compound in the general formula F is 1-40%. The lower limit of the weight percentage of the compound of formula F may be 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 15%, 18%, 20% or 25% relative to the total weight of the liquid crystal composition; the upper limit of the weight percentage of the compound of formula F with respect to the total weight of the liquid crystal composition of the present invention may be 40%, 38%, 36%, 34%, 32%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.
Further, the compound shown in the general formula N is selected from one or more of the following compounds:
in a preferred embodiment of the invention, the compound of formula N is selected from one or more of the following compounds:
in the invention, in the dielectric positive liquid crystal composition, the weight percentage range of the compound shown in the general formula N is 1-60%. The lower limit of the weight percentage of the compound represented by the general formula N is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24%, or 26% relative to the total weight of the liquid crystal composition; the upper limit of the weight percentage of the compound represented by the general formula N is 60%, 58%, 56%, 54%, 52%, 50%, 48%, 46%, 44%, 42%, 40%, 38%, 36%, 34%, 32%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12%, or 10% with respect to the total weight of the liquid crystal composition.
In a preferred embodiment of the invention, the compound of formula D is selected from one or more of the following compounds:
in the invention, in the dielectric positive liquid crystal composition, the weight percentage range of the compound shown in the general formula D is 1-60%. The lower limit of the weight percentage of the compound represented by the general formula D is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24%, or 26% relative to the total weight of the liquid crystal composition; the upper limit of the weight percentage of the compound represented by the general formula D is 60%, 58%, 56%, 54%, 52%, 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12%, or 10% with respect to the total weight of the liquid crystal composition.
In a preferred embodiment, the dielectrically positive liquid crystal composition further comprises one or more compounds of formula II:
wherein R is E1 Is represented by C 1 -C 5 Alkyl of (C) 1 -C 5 Alkoxy group of (C) 2 -C 5 Alkenyl or C 2 -C 5 Alkenyloxy of (a);
ring E1, ring E2 and ring E3 independently represent
And one or more H on the phenyl ring may be substituted by F;
e represents 0 or 1.
Further, the compound represented by the general formula II is selected from one or more of the following compounds:
in a preferred embodiment, the compound of formula II is selected from one or more of the following compounds:
in the dielectrically positive liquid crystal composition, the weight percentage of the compound shown in the general formula II is 1-50%. The lower limit of the weight percentage of the compound of formula II relative to the total weight of the liquid crystal composition is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24%, or 26%; the upper limit of the weight percentage of the compound of formula II with respect to the total weight of the liquid crystal composition is 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.
In a preferred embodiment, one or more additives, such as stabilizers and the like, are also added to the dielectrically positive liquid crystal composition.
For the stabilizer, one or more of the following compounds may be selected:
preferably, the stabilizer is selected from one or more of the following structural stabilizers:
in the stabilizer having the above structure, n represents a positive integer of 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 8, 10, or 11, etc.).
In the liquid crystal composition of the present invention, the stabilizer is added in an amount of 0 to 5% by weight, for example, 1%, 2%, 3%, 4%, 5%, etc. Preferably, the addition amount of the stabilizer is 0 to 1 percent; more preferably, the stabilizer is added in an amount of 0.01 to 0.2%.
In other embodiments, 0-15% pleochroic dyes and/or chiral dopants may also be added to the liquid crystal compositions of the present invention.
Possible dopants added to the liquid crystal composition of the present invention are shown below:
the invention also provides a liquid crystal display, which comprises the dielectric positive liquid crystal composition. Wherein the liquid crystal display comprises TN, ECB, IPS and FFS mode liquid crystal displays. Preferably, the liquid crystal display is an IPS, FFS mode liquid crystal display.
Compared with the prior art, the invention has the beneficial effects that:
the liquid crystal composition provided by the invention has good low-temperature storage phase change point and high photo-thermal stability under the condition of maintaining proper optical anisotropy, proper clearing point and proper dielectric anisotropy, so that a liquid crystal display device containing the liquid crystal composition has a wide use temperature range, high response speed, good transmittance, low image residue and poor quality under the condition of maintaining proper threshold voltage, and has high application value in TN (twisted nematic) mode, IPS (in-plane switching) mode and FFS (fringe field switching) mode liquid crystal displays.
Detailed Description
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.
For convenience of expression, in the following examples, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1.
TABLE 1
The following compounds are exemplified:
the code of Table 1 is expressed as: 5CPUF,5 represents n-pentyl, C represents cyclohexane, P represents 1, 4-diphenyl and U represents 3, 5-difluoro-1, 4-diphenyl.
The following steps are repeated:
the code of Table 1 is expressed as: 3PGUQUF wherein Q represents-CF 2 O-。
The following steps are repeated:
the codes of table 1 are expressed as: 3PGPO2V (2F).
The abbreviated codes of the test items in the following examples are as follows:
C p (° c): clearing point (nematic-isotropic phase transition temperature);
Δ n: refractive index anisotropy (589nm, 25 ℃);
Δ ε: dielectric anisotropy (1KHz, 25 ℃);
t (ms): response time (25 ± 0.5 ℃); liquid crystal was filled between two glass substrates, and t = t was measured by LCT-5016 on +t off ：t on Represents the time required for the relative transmittance to change from 10% to 90%, t off Represents the time required for the relative transmittance to change from 90% to 10%; the electrodes of the glass substrates are arranged in a manner that positive and negative electrodes are positioned on the same glass substrate, the width of the electrodes is 5 μm, and the electrode spacing is 5 μm. The positive and negative electrodes are arranged in a staggered manner.
γ 1 : represents the rotational viscosity [ mPas ] measured at 25 DEG C]Measured in a magnetic field by the rotational method;
wherein Δ ε = ε || -ε ⊥ Wherein, epsilon || Is a dielectric constant parallel to the molecular axis,. Epsilon ⊥ For the dielectric constant perpendicular to the molecular axis, test conditions: 25 ℃ and 1KHz.
LTS: the low temperature stable nematic phase transition temperature (measured in the test cell, C.) and the liquid crystal mixture was stored in a glass bottle and stored at low temperature.
K 11 : splay elastic constant (pN, 25 ℃);
K 33 : flexural modulus (pN, 25 ℃);
VHR: and the higher the voltage holding ratio is measured by a TOYO LCM-2, the less movable ions in the liquid crystal display component are, and the better the stability of the liquid crystal display component is.
Comparative example D1
Preparing liquid crystal according to the following proportion to obtain a mixture D1, filling the mixture D1 between two substrates of the liquid crystal display for performance test, wherein the composition and test data of the mixture D1 are shown in the following table 2-1:
TABLE 2-1
| Components | Percent by weight% | Performance of | Parameter(s) |
| 3CCV | 35.0 | C p | 79.8 |
| 3CCV1 | 9.0 | Δn | 0.125 |
| 1PP2V1 | 11.0 | Δε | 2.47 |
| 4CCV | 6.0 | γ 1 | 54 |
| VCCP1 | 5.0 | LTS | Uncrystallized at-20 ℃ for 6 days |
| 3CCPCF3 | 5.0 | K 11 | 13.6 |
| 2PGP3 | 5.0 | K 33 | 14.2 |
| 3PGP55 | 15.0 | γ 1 /K 11 | 3.97 |
| 3CPUQUF | 2.0 | ||
| 3PGUQUF | 4.0 | ||
| 4PGUQOUF | 3.0 | ||
| Total of | 100 |
Example M1
Preparing liquid crystal according to the following proportion to obtain a mixture M1, filling the mixture M1 between two substrates of the liquid crystal display for performance test, wherein the composition and test data of the mixture M1 are shown in the following table 2-2:
tables 2 to 2
| Components | Percent by weight% | Performance of | Parameter(s) |
| 3CCV | 35.0 | C p | 80.1 |
| 3CCV1 | 9.0 | Δn | 0.126 |
| 1PP2V1 | 11.0 | Δε | 2.5 |
| 4CCV | 6.0 | γ 1 | 45 |
| VCCP1 | 5.0 | LTS | Uncrystallized at-20 ℃ for 10 days |
| 3CCPCF3 | 5.0 | K 11 | 13.8 |
| 1PGPO2V(2F) | 5.0 | K 33 | 16.2 |
| 3PGPO2V(2F) | 15.0 | γ 1 /K 11 | 3.26 |
| 3CPUQUF | 2.0 | ||
| 3PGUQUF | 4.0 | ||
| 4PGUQOUF | 3.0 | ||
| Total of | 100 |
Comparative example D2:
the liquid crystal was prepared in the following proportions to obtain a mixture D2, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture D2 are shown in table 3-1:
TABLE 3-1
Example M2
The liquid crystal was prepared in the following proportions to obtain a mixture M2, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M2 are shown in table 3-2:
TABLE 3-2
Comparative example D3:
preparing liquid crystal according to the following proportion to obtain a mixture D3, filling the mixture D3 between two substrates of the liquid crystal display for performance test, wherein the composition and test data of the mixture D3 are shown in a table 4-1:
example M3
The liquid crystal was prepared in the following proportions to obtain a mixture M3, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M3 are shown in table 4-2:
TABLE 4-2
| Components | Percent by weight% | Performance of | Parameter(s) |
| 3CCV | 43.5 | C p | 75.2 |
| 3CCV1 | 9 | Δn | 0.13 |
| 1PP2V1 | 11.5 | Δε | 2.9 |
| 3PGUQUF | 4.5 | γ 1 | 34 |
| 3DGUQUF | 3 | LTS | Uncrystallized at-20 ℃ for 10 days |
| 4DGUQUF | 3.5 | K 11 | 14.5 |
| 1PGPO2V(2F) | 10 | K 33 | 16.1 |
| 2PGPO2V(2F) | 10 | γ 1 /K 11 | 2.34 |
| 3PGP2V(2F) | 5 | ||
| Total of | 100 |
Example M4
The liquid crystal was prepared in the following proportions to obtain a mixture M4, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M4 are shown in table 5:
TABLE 5
Example M5
The liquid crystal was prepared in the following proportions to obtain a mixture M5, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M5 are shown in table 6:
TABLE 6
Wherein AD-1 represents the following additives:
example M6
The liquid crystal is prepared according to the following proportion to obtain a mixture LCM-6, the mixture LCM-6 is filled between two substrates of the liquid crystal display to carry out performance test, and the composition and the test data of the mixture LCM-6 are shown in Table 7:
TABLE 7
| Components | Percent by weight% | Performance of | Parameter(s) |
| 3CC2 | 4 | C p | 77.5 |
| 3CPP2 | 10 | Δn | 0.129 |
| 3CCV1 | 14 | ε || | 10.6 |
| 3CCV | 38 | ε ⊥ | 4.6 |
| 3PGPO2V(2F) | 6 | Δε | 6.0 |
| 3CPUQUF | 6 | ||
| 4DPUQUF | 2 | γ 1 | 49 |
| 5PGUQUF | 5 | LTS | Uncrystallized at-25 ℃ for 10 days |
| VCCP1 | 4 | K 11 | 14.5 |
| V2CCP1 | 4 | K 33 | 16.5 |
| 3PUQUF | 3 | ||
| 3CCPUF | 4 | ||
| Total of | 100 |
Example M7
The liquid crystal was prepared in the following proportions to obtain a mixture M7, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M7 are shown in table 8:
TABLE 8
Example M8
The liquid crystal was prepared in the following proportions to obtain a mixture M8, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M8 are shown in table 9:
TABLE 9
| Components | Percent by weight% | Performance of | Parameter(s) |
| 3CGPC3 | 1 | C p | 75.8 |
| 3CPUF | 28 | Δn | 0.125 |
| 3CCUF | 4 | ε || | 11.0 |
| 3CCPUF | 4 | ε ⊥ | 3.3 |
| 5CCPUF | 3 | Δε | 7.7 |
| 3CCV | 34 | ||
| 3CCV1 | 7 | γ 1 | 53 |
| 3PGUQUF | 6 | LTS | Uncrystallized at-25 ℃ for 10 days |
| 5PGUQUF | 4 | K 11 | 11.4 |
| 3PGUF | 5 | K 33 | 13.3 |
| 1PGP’O2V(2F) | 4 | ||
| In total | 100 | ||
| AD-2 | 0.04 |
Wherein AD-2 represents the following additives:
example M9
The liquid crystal was prepared in the following proportions to obtain a mixture M9, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M9 are shown in table 10:
TABLE 10
| Components | Percentage of | Performance of | Parameter(s) |
| 3CCV | 21 | C p | 99 |
| 3CCV1 | 5 | Δn | 0.123 |
| 1PGP’O2V(2F) | 2 | ε || | 13.9 |
| 2CCUF | 8 | ε ⊥ | 3.5 |
| VCCP1 | 14 | Δε | 10.4 |
| 3PUQUF | 8 | ||
| 2CPUQUF | 10 | γ 1 | 66 |
| 5CCUF | 8.5 | LTS | Uncrystallized at-25 ℃ for 10 days |
| 3CPUQUF | 9.5 | K 11 | 17.5 |
| 3CCPUF | 5 | K 33 | 13.2 |
| 3PGUQUF | 2.5 | ||
| 5PGUQUF | 6.5 | ||
| Total of | 100 |
Example M10
The liquid crystal was prepared in the following proportions to obtain a mixture M10, which was filled between two substrates of a liquid crystal display for performance testing, and the composition and test data of the mixture M10 are shown in table 11:
TABLE 11
Example M11
The liquid crystal was prepared in the following proportions to obtain a mixture M11, which was filled between two substrates of the liquid crystal display for performance testing, and the composition and test data of the mixture M11 are shown in table 12:
TABLE 12
| Components | Percentage of | Performance of | Parameter(s) |
| 3CCV | 40.5 | C p | 80 |
| 3CCV1 | 5 | Δn | 0.145 |
| 1PP2V1 | 10 | Δε | 2.8 |
| 3PUQUF | 3.5 | γ 1 | 43 |
| 3CCP1 | 3 | LTS | Uncrystallized at-20 ℃ for 10 days |
| 1PGPO2V(2F) | 11 | K 11 | 16.8 |
| 2PGPO2V(2F) | 6.5 | K 33 | 17.5 |
| 3PGPO2V(2F) | 13 | γ 1 /K 11 | 2.56 |
| 3PGUQUF | 3.5 | ||
| 4DGUQUF | 4 | ||
| Total of | 100 |
As can be seen from the above examples, the liquid crystal composition of the present invention has a large elastic constant and a good low-temperature storage phase change point while maintaining a suitable optical anisotropy, a suitable clearing point, and a suitable dielectric anisotropy, so that a liquid crystal display device including the liquid crystal composition has a wide operating temperature range, a fast response speed, and a good transmittance while maintaining a suitable threshold voltage, and has a high application value in TN mode, IPS mode, and FFS mode liquid crystal displays.
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 (14)
1. A dielectrically positive liquid crystal composition, comprising:
(1) At least one compound of formula I:
wherein R is 1 Represents H, halogen or C 1 -C 15 Alkyl groups of (a); x 1 、X 2 One is F and the other is H; m represents an integer of 1 to 8;
(2) At least one compound of formula F:
wherein the rings B1 and B2 independently represent
One or more of H on mayTo be substituted by F;
R B1 、R B2 independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl of (a);
L B1 、L B2 independently of one another, F, cl, CH 3 Or CF 3 ；
b represents 0 or 1;
(3) At least one compound of the general formula N:
wherein R is C1 、R C2 Independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl of (a);
ring C1 and ring C2 independently represent
And at least one of rings C1, C2 is->
Up to one H is substituted by F;
c. d is independently of each other 0, 1 or 2;
Z C1 、Z C2 independently of one another, a carbon-carbon single bond, -CH 2 CH 2 -、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-CF 2 CF 2 -or-CF = CF-;
(4) At least one compound of formula D:
wherein R is D1 、R D2 Independently of one another represent C 1 -C 12 Alkyl of (C) 1 -C 12 Alkoxy or C 2 -C 12 Alkenyl groups of (a).
2. Dielectrically positive liquid crystal composition according to claim 1, wherein the compound of formula I is selected from one or more of the following compounds:
3. dielectrically positive liquid crystal composition according to claim 2, wherein the compound of formula I is selected from one or more of the following compounds:
4. dielectrically positive liquid crystal composition according to claim 1, wherein the compound of formula F is selected from one or more of the following compounds:
5. dielectrically positive liquid crystal composition according to claim 1, wherein the compound of formula N is selected from one or more of the following compounds:
6. dielectrically positive liquid crystal composition according to claim 5, wherein the compound of formula N is selected from one or more of the following compounds:
7. dielectrically positive liquid crystal composition according to claim 1, wherein the compound of formula D is selected from one or more of the following compounds:
8. the dielectrically positive liquid crystal composition according to claim 1, further comprising one or more compounds of formula II:
wherein R is E1 Is represented by C 1 -C 5 Alkyl of (C) 1 -C 5 Alkoxy group of (C) 2 -C 5 Alkenyl or C of 2 -C 5 Alkenyloxy of (a);
ring E1, ring E2 and ring E3 independently represent
And one or more H on the phenyl ring may be substituted by F;
e represents 0 or 1.
9. Dielectrically positive liquid crystal composition according to claim 8, wherein the compound of formula II is selected from one or more of the following compounds:
10. dielectrically positive liquid crystal composition according to claim 9, wherein the compound of formula II is selected from one or more of the following compounds:
11. the dielectrically positive liquid crystal composition according to any one of claims 1 to 7, wherein the content of the compound represented by the general formula I is 1 to 50%, the content of the compound represented by the general formula F is 1 to 40%, the content of the compound represented by the general formula N is 1 to 60%, and the content of the compound represented by the general formula D is 1 to 60% by mass.
12. The dielectrically positive liquid crystal composition according to any one of claims 8 to 10, wherein the compound represented by the general formula II is contained in the dielectrically positive liquid crystal composition in an amount of 1 to 40% by mass.
13. The dielectrically positive liquid crystal composition according to any one of claims 1 to 12, wherein one or more additives are further added to the dielectrically positive liquid crystal composition, the additives comprising stabilizers, dopants and pleochroic dyes;
according to the mass percentage, the addition amount of the stabilizer is 0-5%; the addition amount of the dopant and the multicolor dye is 0-15%.
14. A liquid crystal display comprising the dielectrically positive liquid crystal composition according to any one of claims 1 to 13.
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| DE4428766A1 (en) * | 1993-08-28 | 1995-03-02 | Merck Patent Gmbh | Benzene derivatives, and liquid-crystalline medium |
| CN103205262A (en) * | 2013-03-13 | 2013-07-17 | 江苏和成显示科技股份有限公司 | Liquid crystal composition and liquid crystal display device |
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