CN115537210A - Positive and negative mixed liquid crystal composition and application thereof - Google Patents
Positive and negative mixed liquid crystal composition and application thereof Download PDFInfo
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- CN115537210A CN115537210A CN202211219597.XA CN202211219597A CN115537210A CN 115537210 A CN115537210 A CN 115537210A CN 202211219597 A CN202211219597 A CN 202211219597A CN 115537210 A CN115537210 A CN 115537210A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 46
- 239000000203 mixture Substances 0.000 title claims abstract description 39
- 150000001875 compounds Chemical class 0.000 claims abstract description 51
- 125000000217 alkyl group Chemical group 0.000 claims description 16
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 10
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 8
- 125000001153 fluoro group Chemical group F* 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 238000006467 substitution reaction Methods 0.000 claims description 2
- 239000000178 monomer Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 101100208473 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) lcm-2 gene Proteins 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 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 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal Substances (AREA)
Abstract
The invention discloses a positive and negative mixed liquid crystal composition and application thereof, wherein the positive and negative mixed liquid crystal composition comprises the following components in percentage by mass of 100 percent: comprises one or more compounds with negative structures shown as a general formula I or a general formula II, and the mass fraction of the compounds is 2-18%; comprises one or more compounds with the structure shown in a general formula III, and the mass fraction of the compounds is 2 to 40 percent; comprises one or more compounds with the structure shown in the general formula IV, and the mass fraction of the compounds is 2 to 75 percent; comprises one or more compounds with the structure shown in the general formula V, and the mass fraction of the compounds is 1 to 30 percent; comprises one or more compounds with the structure shown in the general formula VI, and the mass fraction of the compounds is 0.5-50%. The liquid crystal composition has larger elastic constant, vertical dielectric and lower rotational viscosity, can improve the response speed, is suitable for low-frequency driving, reduces the power consumption, and can be used as variable-frequency liquid crystal for IPS display.
Description
Technical Field
The invention belongs to the technical field of liquid crystal materials, and particularly relates to a positive and negative mixed liquid crystal composition and application thereof.
Background
A liquid crystal material is a mixture of organic compounds that has both liquid fluidity and crystalline anisotropy. In recent years, the application fields of liquid crystal compositions have been greatly expanded to various types of display devices, electro-optical devices, electronic components, sensors, and the like. Of these, nematic liquid crystal mixtures have found the most widespread use in flat panel display devices, in particular in passive TN or STN matrix displays or systems with TFT active matrix. The IPS display, which uses nematic liquid crystal as well as the TN display, has a higher contrast ratio, a wider viewing angle, and a lower color shift, and thus is very widely used in display products. However, the better display effect also has the corresponding disadvantages: firstly its slower response speed compared to TN mode, and secondly its large power consumption penalty due to long term high frequency driving.
Therefore, there is a need for a liquid crystal composition that can improve the response speed and maintain normal operation even in low-frequency driving, thereby reducing power consumption while ensuring image quality.
Disclosure of Invention
The technical problem to be solved is as follows: in order to solve the technical problems, the invention provides a positive-negative mixed liquid crystal composition and application thereof, wherein the positive-negative mixed liquid crystal composition has a larger elastic constant, vertical dielectric and lower rotational viscosity, can improve response speed, is suitable for low-frequency driving, reduces power consumption, and can be used as a variable-frequency liquid crystal for IPS display.
The technical scheme is as follows: a positive and negative mixed liquid crystal composition comprises the following components by the total mass fraction of 100 percent:
comprises a compound with a negative structure, the mass fraction of the compound with the negative structure is 2-18%, the structure of the compound is shown as a general formula I or a general formula II,
the general formula I is:
wherein R is 1 And R 2 Each independently represents C 1 -C 3 The linear alkyl group of (1);
the general formula II is:
wherein R is 3 And R 4 Each independently represents C 1 -C 3 The linear alkyl group of (1); z represents-OCH 2 -; n represents 0 or 1-OCH 2 -; when n =0, ring A1 representsA benzene ring; when n =1, ring A1 represents cyclohexane;
comprises one or more compounds with the structure shown in the general formula III, the mass fraction of the compounds is 2-40%, and the general formula III is as follows:
wherein R is 5 Is represented by C 2 -C 5 The linear alkyl group of (1); when Y is 1 When substituted by F atom, ring A2 represents a benzene ring molecule; when Y is 1 When it is an H atom, ring A2 represents
Comprises one or more compounds with the structure shown in the general formula IV, the mass fraction of the compounds is 2-75%, and the general formula IV is as follows:
wherein R is 6 Is represented by C 1 -C 3 The linear alkyl group of (1); r is 7 Is represented by C 2 -C 4 Straight chain alkyl or C 1 -C 3 An alkenyl chain of (a);
comprises one or more compounds with a structure shown in a general formula V, the mass fraction of the compounds is 1-30%, and the general formula V is as follows:
wherein R is 8 Is represented by C 1 -C 3 The linear alkyl group of (1); r 9 represents-OCF 3 Or
Substitution; when R is 9 is-OCF 3 When substituted, ring A 3 And ring A 4 All represent cyclohexane, ring A 5 Represents a benzene ring; when R is 9 Is composed of
When substituted, ring A 3 Represents a benzene ring, ring A 4 And ring A 5 All represent cyclohexane;
comprises one or more compounds with the structure shown in the general formula VI, the mass fraction of the compounds is 0.5-50%, and the general formula VI is:
wherein R is 10 Is represented by C 1 -C 5 The linear alkyl group of (1); r 11 Is represented by C 1 -C 5 Linear alkyl or F atom of (a); y is 2 、Y 3 And Y 4 Each independently represents a F atom or a H atom; ring A 6 And ring A 7 Each independently represents cyclohexane or a benzene ring.
Preferably, the compound of formula I is selected from one or more of the following formulae:
preferably, the structure of the compound shown in the general formula I is shown as a formula I-4.
Preferably, the compound of formula II is selected from one or more of the following formulae:
preferably, the compound shown in the general formula II is selected from one or two of IIA-5 and IIB-6.
Preferably, the compound of formula III is selected from one or more of the following formulae:
preferably, the compound of formula IV is selected from one or more of the following formulae:
preferably, the compound of formula V is selected from one or more of the following formulae:
preferably, the compound of formula VI is selected from one or more of the following formulae:
the positive and negative mixed liquid crystal composition is applied to IPS display.
Has the advantages that: the liquid crystal composition has larger elastic constant and vertical dielectric, can remarkably enhance the anchoring energy and the self-recovery capability of a liquid crystal system, reduces flicker, can also keep normal work under the condition of low-frequency driving, and thus can reduce power consumption while ensuring clear image quality; meanwhile, the liquid crystal composition also has lower rotational viscosity, so that the response speed can be improved. Therefore, the liquid crystal composition has important application in the field of IPS display, especially in frequency conversion display.
Detailed Description
The invention is further described with reference to specific examples.
The invention is further described with reference to specific examples.
The abbreviated codes of the test items in the following examples are as follows:
tni: clearing Point (. Degree. C.)
no: refractive index of ordinary ray (589nm, 25 ℃ C.)
ne: refractive index of extraordinary ray (589nm, 25 ℃ C.)
Δ n: refractive index anisotropy (589nm, 25 ℃);
t: represents the response time (ms) measured at 25 deg.C
Δ ε: dielectric anisotropy (1KHz, 25 ℃);
wherein Δ ε = ε// - ε ⊥ Wherein ε// is the dielectric constant parallel to the molecular axis,. Epsilon. Is the dielectric constant perpendicular to the molecular axis, test conditions: 25 ℃ and 1KHz.
K11: elasticity constant of splay
K33: flexural elastic constant
γ 1: it represents a rotational viscosity [ mPas ] measured at 25 ℃ at a box thickness of 20 μm, as measured by LCM-2.
VHR: the voltage holding ratio was expressed and the test conditions (5V, 6Hz,60 ℃) were measured by LCM-2.
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
Table 1: liquid crystal compound tube energy cluster code
Weighing the compound with the corresponding general structure according to the mass percentage in the embodiment, placing the weighed monomers in a hard high borosilicate glass bottle, heating under the protection of nitrogen, stirring electromagnetically or mechanically until the mixture is molten, clear, uniform and transparent solution, continuing stirring for 30 minutes, and stopping heating after the materials are thoroughly and uniformly mixed. Degassing under reduced pressure while stirring; the vacuum degree is increased along with the reduction of the temperature, the stirring is stopped until the temperature is cooled to the room temperature, and the vacuum pumping is continued until no bubbles appear. The test box can be filled for testing.
Example 1
From example 1, it can be found that the composition has a large K value, a low rotational viscosity, a fast response time, excellent quality parameters, and greatly improves the quality of the liquid crystal display device.
Example 2
Example 3
Example 4
Example 5
Comparing examples 1-5, it can be seen that when the amount of the type I negative monomer structure is increased from 4% to 10%, the vertical dielectric constant (∈ ∈ is increased from 2.83 to 3.01, and the increase of the vertical dielectric constant can effectively reduce flickers. When the proportion of the type I monomer is 10%, the vertical dielectric reaches the maximum. Although the rotary viscosity of the liquid crystal is larger and the response speed is slower with the increase of the proportion of the negative monomer, the viscosity and the response time can still reach the range of quick response, and the liquid crystal has a relatively higher K value, so that the recovery capability of the liquid crystal is enhanced, and the picture can still be kept clear even if the liquid crystal is driven at a low frequency.
Example 6
Example 7
Example 8
Example 9
Example 10
From examples 6 to 10, it can be found that when the amount of the IIA-5 negative monomer structure used was increased from 4% to 10%, the vertical dielectric (. Epsilon. Quadrature. Sup.p) thereof was increased from 2.92 to 3.11. When the IIA-5 monomer proportion is 10%, the vertical dielectric reaches the maximum, and flickers can be effectively reduced. Although the increase of the proportion of IIA-5 negative monomers leads to the increase of the rotational viscosity of the liquid crystal, the rotational viscosity is increased from 54.1mpa.s to 57.2mpa.s, the response speed is slow, the viscosity and the response time can still reach the range of fast response, and the liquid crystal has a relatively high K value, the liquid crystal recovery capability is enhanced, and the picture can still be kept clear even if the liquid crystal is driven at a low frequency.
Example 11
Example 12
As can be seen from examples 11 to 12, when the amount of the IIB-6 negative monomer structure used was increased from 4% to 5%, the vertical dielectric (. Epsilon. Quadrature. Sup.2.81) thereof was increased to 2.87, the tendency of the increase was small.
Comparative example 1
The liquid crystal compositions obtained in examples 2, 7 and 12 and comparative example 1 were compared in summary with respect to the values of the respective performance parameters, as shown in the following table:
as can be seen by comparison: when 5% of negative structure monomer I-4, IIA-5, IIB-6 is added, the three can increase the vertical dielectric, compared with comparative example 1, the epsilon of example 2 is increased by about 13%, the epsilon of example 7 is increased by 22%, and the epsilon of example 12 is increased by 11%. The addition of IIA-5 maximizes the vertical dielectric increase, and a larger vertical dielectric can reduce flicker and ensure a clear picture.
The liquid crystal composition has larger elastic constant and vertical dielectric, can remarkably enhance the anchoring energy and self-recovery capability of a liquid crystal system, reduce flickers and keep normal operation under the condition of low-frequency driving, thereby ensuring clear image quality and reducing power consumption; meanwhile, the liquid crystal composition also has lower rotational viscosity, so that the response speed can be improved. Therefore, the liquid crystal composition has important application in the field of IPS display, especially in frequency conversion display.
Claims (10)
1. The positive-negative mixed liquid crystal composition is characterized by comprising the following components in percentage by mass of 100 percent in total:
comprises one or more compounds with negative structures, the mass fraction of the compounds with the negative structures is 2-18%, the structures of the compounds with the negative structures are shown as a general formula I or a general formula II,
the general formula I is:
wherein R is 1 And R 2 Each independently represents C 1 -C 3 The linear alkyl group of (1);
the general formula II is:
wherein R is 3 And R 4 Each independently represents C 1 -C 3 The linear alkyl group of (1); z represents-OCH 2 -; n represents 0 or 1-OCH 2 -; when n =0, ring A1 represents a benzene ring; when n =1, ring A1 represents cyclohexane;
comprises one or more compounds with the structure shown in a general formula III, wherein the mass fraction of the compounds is 2-40%, and the general formula III is as follows:
wherein R is 5 Is represented by C 2 -C 5 The linear alkyl group of (1); when Y is 1 When substituted by F atom, ring A2 represents a benzene ring molecule; when Y is 1 When it is an H atom, ring A2 represents
Comprises one or more compounds with the structure shown in the general formula IV, the mass fraction of the compounds is 2-75%, and the general formula IV is as follows:
wherein R is 6 Is represented by C 1 -C 3 The linear alkyl group of (1); r 7 Is represented by C 2 -C 4 Straight chain alkyl or C 1 -C 3 Alkenyl chains of (a);
comprises one or more compounds with a structure shown in a general formula V, the mass fraction of the compounds is 1-30%, and the general formula V is as follows:
wherein R is 8 Is represented by C 1 -C 3 The linear alkyl group of (1); r 9 represents-OCF 3 Or
Substitution; when R is 9 is-OCF 3 When substituted, ring A 3 And ring A 4 All represent cyclohexane, ring A 5 Represents a benzene ring; when R is 9 Is composed of
When substituted, ring A 3 Represents a benzene ring, ring A 4 And ring A 5 All represent cyclohexane;
comprises one or more compounds with the structure shown in the general formula VI, the mass fraction of the compounds is 0.5-50%, and the general formula VI is as follows:
wherein R is 10 Is represented by C 1 -C 5 The linear alkyl group of (1); r 11 Is represented by C 1 -C 5 Linear alkyl or F atom of (a); y is 2 、Y 3 And Y 4 Each independently represents a F atom or a H atom; ring A 6 And ring A 7 Each independently represents cyclohexane or a benzene ring.
2. The positive-negative mixed liquid crystal composition according to claim 1, wherein the compound represented by the formula I is selected from one or more compounds represented by the following formulae:
3. the positive-negative mixed liquid crystal composition as claimed in claim 2, wherein the compound represented by the general formula I has a structure represented by formula I-4.
4. The positive-negative mixture liquid crystal composition according to claim 1, wherein the compound represented by formula II is selected from one or more of the following formulae:
5. the positive-negative mixture liquid crystal composition as claimed in claim 4, wherein the compound represented by formula II is one or two selected from IIA-5 and IIB-6.
6. The positive-negative mixture liquid crystal composition according to claim 1, wherein the compound of formula III is selected from one or more of the following formulae:
7. the positive-negative mixture liquid crystal composition according to claim 1, wherein the compound of formula IV is selected from one or more of the following formulae:
8. the positive-negative mixture liquid crystal composition according to claim 1, wherein the compound represented by formula V is selected from one or more of the following formulae:
9. the positive-negative mixture liquid crystal composition according to claim 1, wherein the compound of formula VI is selected from one or more of the following formulae:
10. use of a positive-negative hybrid liquid crystal composition according to any one of claims 1 to 9 for IPS displays.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103320142A (en) * | 2012-02-15 | 2013-09-25 | 默克专利股份有限公司 | Liquid-crystalline medium |
| CN104371745A (en) * | 2014-10-24 | 2015-02-25 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composite |
| CN105199745A (en) * | 2015-09-30 | 2015-12-30 | 石家庄诚志永华显示材料有限公司 | Positive-negative-mixed liquid crystal composition |
| CN109825311A (en) * | 2019-03-19 | 2019-05-31 | 西安瑞立电子材料有限公司 | Positive and negative mixed liquid crystal composition |
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- 2022-09-30 CN CN202211219597.XA patent/CN115537210A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103320142A (en) * | 2012-02-15 | 2013-09-25 | 默克专利股份有限公司 | Liquid-crystalline medium |
| CN104371745A (en) * | 2014-10-24 | 2015-02-25 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composite |
| CN105199745A (en) * | 2015-09-30 | 2015-12-30 | 石家庄诚志永华显示材料有限公司 | Positive-negative-mixed liquid crystal composition |
| CN109825311A (en) * | 2019-03-19 | 2019-05-31 | 西安瑞立电子材料有限公司 | Positive and negative mixed liquid crystal composition |
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