CN113637487A - Negative liquid crystal composition with quick response and application thereof - Google Patents
Negative liquid crystal composition with quick response and application thereof Download PDFInfo
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- CN113637487A CN113637487A CN202110915708.XA CN202110915708A CN113637487A CN 113637487 A CN113637487 A CN 113637487A CN 202110915708 A CN202110915708 A CN 202110915708A CN 113637487 A CN113637487 A CN 113637487A
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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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- 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
Abstract
The invention relates to a negative liquid crystal composition with quick response and application thereof, belonging to the technical field of liquid crystal materials. The negative liquid crystal composition comprises a monomer compound with a structure shown in a general formula I, and the mass fraction of the monomer compound is 20-40%; the mass fraction of the monomer compound with the structure shown in the general formula II is 30-38%; the mass fraction of the monomer compound with the structure shown in the general formula III is 25-40%; the mass fraction of the monomer compound with the structure shown in the general formula IV is 0-18%. The invention solves the problem of slow response time of VA by improving the k value of the liquid crystal material, reducing the rotational viscosity and increasing the birefringence so as to reduce the cell thickness, greatly improves the quality of a display device, and can also be used in the field of PSVA and UV 2A. Meanwhile, the driving voltage of the liquid crystal is reduced by properly improving the dielectric constant of the liquid crystal, so that the reduction of power consumption is facilitated.
Description
Technical Field
The invention relates to a negative liquid crystal composition with quick response and application thereof, wherein the liquid crystal composition can be applied to the liquid crystal display industry, in particular to a liquid crystal display device, can improve the trailing phenomenon of a display picture, particularly a dynamic picture, thereby improving the picture quality and properly improving the dielectric constant of liquid crystal to reduce the driving voltage of the liquid crystal, and belongs to the technical field of liquid crystal materials.
Background
With the rapid development of liquid crystal materials and liquid crystal display technologies, liquid crystal displays are more and more widely applied, and liquid crystal products such as mobile phones, flat panels, panels for automobiles, televisions, computer display screens and the like are widely seen in daily life. The liquid crystal main stream display modes include TN, VA, IPS, FFS, and the like, and these displays have characteristics such as high transmittance in the TN mode, but low contrast at a viewing angle. IPS and FFS have high contrast and wide viewing angle. The VA mode has the highest contrast but belongs to the traditional "soft screen".
As the demand for display increases, the demand for high-quality display becomes important. The VA negative liquid crystal has excellent high contrast. Some MVA, PVA and other mode negative liquid crystals gradually appear in the prior art, and the negative liquid crystals solve the problem of visual angle by utilizing multi-domain.
With respect to the above-described related art, there are the following drawbacks: the response time of negative liquid crystals in modes such as MVA and PVA is slow, the response speed of a pixel point to an input signal cannot be kept up with that of the input signal, a similar residual image or a trail appears when a picture moving at a high speed is watched, the smoothness of the picture cannot be ensured, and the driving voltage is high because the dielectric constant of the negative liquid crystal is relatively small.
Disclosure of Invention
The invention mainly aims to solve the problems of high rotary viscosity, low response speed, low dielectric constant and high driving voltage of a negative liquid crystal material.
In order to improve the above problems, the present invention provides a negative liquid crystal composition having a fast response. The liquid crystal composition greatly improves the response time by improving the problems of high rotary viscosity, slow response time and the like of negative liquid crystal, and reduces the driving voltage of the liquid crystal by properly improving the dielectric constant of the liquid crystal. The invention improves the rotary viscosity of the negative liquid crystal material, improves the response speed, increases the dielectric constant and reduces the driving voltage. The composition can be applied to the fields of PSVA, UV2A and the like, and has great significance for the high display field.
In order to achieve the purpose, the invention adopts the following technical scheme:
a negative liquid crystal composition material with quick response comprises the following components in percentage by mass:
the monomer compound at least comprises one or more monomer compounds with the structure shown in the general formula I, the mass fraction of the monomer compound is 20-40%, and the specific structure of the general formula I is as follows:
in the general formula, R1，R2Each independently represents a linear alkyl group or an alkenyl group having 1 to 5 carbon atoms; a. the1，A2Each independently represents cyclohexane or benzene ring;
the monomer compound at least comprises one or more monomer compounds with a structure shown in a general formula II, the mass fraction of the monomer compound is 30-38%, and the specific structure of the general formula II is as follows:
in the general formula, R3,R4Each independently represents a linear alkyl group with 2-5 carbon atoms; n represents 1 or 2 cyclohexanes;
the monomer compound at least comprises one or more monomer compounds with a structure shown in a general formula III, the mass fraction of the monomer compound is 25-40%, and the specific structure of the general formula I is as follows:
in the general formula, R5Represents a linear alkyl group having 2 to 5 carbon atoms; r6Represents a linear alkyl group or an alkenyl group or an alkoxy group having 1 to 4 carbon atoms; y is1,Y2,Y3Each independently represents a-F or-H group substitution; a3 and A4 each independently represent a cyclohexane or benzene ring;
the monomer compound at least comprises one or more monomer compounds with a structure shown in a general formula IV, the mass fraction of the monomer compound is 0-18%, and the specific structure of the general formula IV is as follows:
in the general formula, R7Represents a linear alkyl group having 2 to 5 carbon atoms; r8Represents a linear alkyl or alkoxy substitution with 2-6 carbon atoms; a5 represents a cyclohexane or benzene ring; m represents 0 or 1 benzene ring;
the sum of the mass of the monomer compounds with the structures shown in the general formula I, the general formula II, the general formula III and the general formula IV is 100 percent.
Preferably, in the liquid crystal composition material, the compound shown in the general formula I is selected from one or more of the following compounds shown in the general formulas I-1 to I-15:
further preferably, the compound represented by the general formula I is selected from one or more of liquid crystal compounds represented by the general formulae I-3, I-5, I-6, I-7, I-8, I-9, I-11, I-12, I-13, I-14 and I-15.
More preferably, the compound represented by the general formula I is selected from a plurality of compounds represented by the general formulae I-3, I-5, I-7, I-9, I-11, I-12, I-13, I-14 and I-15.
Preferably, in the liquid crystal composition material, the compound shown in the general formula II is selected from one or more of the following compounds shown in general formulas II-1 to II-18:
further preferably, the compound represented by the general formula II is selected from one or more liquid crystal compounds represented by the general formulae II-1, II-2, II-5, II-6 and II-7.
More preferably, the compound represented by the general formula II is selected from a plurality of compounds represented by the general formulae II-2, II-5 and II-6.
Preferably, in the liquid crystal composition material, the compound shown in the general formula III is selected from one or more of the following compounds shown in general formulas III-1 to III-34:
further preferably, the compound represented by the formula III is selected from one or more liquid crystal compounds represented by the formulae III-5, III-6, III-9, III-10, III-13, III-20, III-24, III-29, III-33 and III-34.
More preferably, the compound of formula III is selected from one or more liquid crystal compounds of formulae III-5, III-10, III-13, III-20, III-24, III-29, III-30, III-31, III-32 and III-34.
Preferably, in the liquid crystal composition material, the compound shown in the general formula IV is selected from one or more of the following compounds shown in general formulas IV-1 to IV-19:
further preferably, the compound represented by the general formula IV is selected from one or more liquid crystal compounds represented by general formulas IV-6, IV-8, IV-16 and IV-17.
More preferably, the compound represented by the general formula IV is one or two compounds selected from the group consisting of compounds represented by the general formulae IV-6, IV-8 and IV-17.
In the negative liquid crystal composition material with quick response, the compound shown in the general formula I accounts for 22-40 percent by weight, and more preferably 23-38 percent by weight; the compound shown in the general formula II is 32-38%, and more preferably 33-37%; the compound shown in the general formula III is 27 to 40 percent, and more preferably 28 to 39 percent; the content of the compound shown in the general formula IV is 0-16% or 0.1-16%, more preferably 0-15% or 0.5-15%.
The negative liquid crystal composition material with quick response can be applied to liquid crystal display devices of negative display modes, wherein the negative display modes comprise VA, PSVA, UV2A, IPS, FFS and the like.
The liquid crystal composition has a large k value and a small rotary viscosity, greatly improves the response speed, solves the problems of high rotary viscosity, slow response time and the like of a negative liquid crystal material, and the problem that the slow response time is always troubled by negative liquid crystal.
The invention has the advantages that:
the negative liquid crystal material has the problems of high rotational viscosity due to the molecular structure, slow response time in the use process and the like, and the slow response time can cause trailing of a display picture, particularly a dynamic picture, and influences the continuity and the ornamental value of the picture quality. The invention solves the problem of slow response time of VA by improving the k value of the liquid crystal material, reducing the rotational viscosity and increasing the birefringence so as to reduce the cell thickness, greatly improves the quality of a display device, and simultaneously reduces the driving voltage of the liquid crystal by properly improving the dielectric constant of the liquid crystal, thereby being beneficial to reducing the power consumption.
The invention solves the problems of high rotary viscosity, slow response time and the like of the negative liquid crystal material, and the problem that the slow response time is always troubled by VA, solves the problem that the slow response time of VA exists, greatly improves the quality of VA using a display device, and can be used in the fields of PSVA and UV 2A.
Detailed Description
The liquid crystal composition is prepared according to the following method, and the production process comprises the following steps: weighing the compounds according to the formula proportion, mixing and placing the compounds in a hard high borosilicate glass bottle, vacuumizing, supplementing nitrogen, repeating the operation for three times, heating the mixture under the protection of nitrogen, electromagnetically stirring or mechanically stirring until the mixture is a molten, clear, uniform and transparent solution, continuing stirring for 30 minutes, and stopping heating after the materials are thoroughly and uniformly mixed. Then stirred at room temperature for 1 hour. Filtering the mixed liquid crystal into a clean and dry hard high borosilicate suction filter bottle by using a sand core funnel, then decompressing and degassing under stirring until no bubbles appear, and finally bottling and packaging.
The test items in the following examples of the present invention are abbreviated as follows:
tni: clearing the bright spots;
no: refractive index of ordinary rays (589nm, 25 ℃);
ne: refractive index of extraordinary ray (589nm, 25 ℃);
Δ n: refractive index anisotropy (589nm, 25 ℃);
ton + off, which represents the response time measured at 25 ℃ in a 4um vertical box;
Δ ε: dielectric anisotropy (1KHz, 25 ℃);
wherein, Delta Epsilon is Epsilon/Epsilon⊥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 1 KHz;
k11: a splay elastic constant;
k33: a bending elastic constant;
γ 1: represents the rotational viscosity [ mPas ] measured at 25 ℃ at a box thickness of 20 μm, as determined by Instec.
Example 1:
according to the composition of the liquid crystal composition in Table 1, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 1.
Table 1 composition and test data for liquid crystal composition of example 1
The liquid crystal display device of example 1 has a large dielectric constant, a slightly large birefringence, a low rotational viscosity and a relatively large K value, which is significant for the display devices of VA, PSVA, UV2A and other negative liquid crystals, and the quality of the liquid crystal display device is greatly improved.
Example 2:
according to the composition of the liquid crystal composition in Table 2, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 2.
Table 2 composition of liquid crystal composition and test data of example 2
In example 2, it was found that the liquid crystal material has a low clearing point and a moderate refractive index and dielectric constant, and particularly, has a low rotational viscosity capable of greatly improving the fast speed of a display device.
Example 3:
according to the composition of the liquid crystal composition in Table 3, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 3.
Table 3 composition of liquid crystal composition and test data for example 3
Example 4:
according to the composition of the liquid crystal composition shown in Table 4, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 4.
Table 4 composition of liquid crystal composition and test data for example 4
Example 5:
according to the composition of the liquid crystal composition shown in Table 5, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 5.
Table 5 composition of liquid crystal composition and test data for example 5
Example 6:
according to the composition of the liquid crystal composition shown in Table 6, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 6.
Table 6 composition and test data for liquid crystal composition of example 6
Example 7:
according to the composition of the liquid crystal composition shown in Table 7, the liquid crystal composition was prepared according to the method of the present invention, and the liquid crystal composition was filled in a test cell for performance test, and the results of the measured physical property parameters are shown in Table 7.
Table 7 composition and test data for liquid crystal composition of example 7
The liquid crystal composition has a larger k value and a lower rotational viscosity, and can improve the response speed by matching with the thickness of a liquid crystal box, thereby improving the display image quality. The dielectric constant of the liquid crystal is properly increased to reduce the driving voltage of the liquid crystal, thereby being beneficial to reducing the power consumption.
Claims (9)
1. A fast-response, negative-working liquid crystal composition characterized by: the monomer compound comprises a structure shown in a general formula I, the mass fraction of the monomer compound is 20% -40%, and the structure of the general formula I is as follows:
in the formula, R1，R2Each independently represents a linear alkyl group or an alkenyl group having 1 to 5 carbon atoms; a. the1，A2Each independently represents a cyclohexane or benzene ring;
the mass fraction of the monomer compound with the structure shown in the general formula II is 30-38%, and the structure of the general formula II is as follows:
in the formula, R3,R4Each independently represents a linear alkyl group having 2 to 5 carbon atoms; n represents 0 or 1;
the mass fraction of the monomer compound with the structure shown in the general formula III is 25-40%, and the structure of the general formula I is as follows:
in the formula, R5Represents a linear alkyl group having 2 to 5 carbon atoms; r6Represents a linear alkyl group, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms; y is1,Y2,Y3Each independently represents F or H; a3 and A4 each independently represent a cyclohexane or benzene ring;
the mass fraction of the monomer compound with the structure shown in the general formula IV is 0-18%, and the structure of the general formula IV is as follows:
in the formula, R7Represents a linear alkyl group having 2 to 5 carbon atoms; r8Represents a linear alkyl group or an alkoxy group having 2 to 6 carbon atoms; a5 represents a cyclohexane or benzene ring; m represents 0 or 1.
2. The fast-response, negative-working liquid crystal composition of claim 1, wherein: the compound shown in the general formula I is selected from one or more compounds shown in general formulas I-1 to I-15:
3. the fast-response, negative-working liquid crystal composition of claim 1, wherein: the compound shown in the general formula II is selected from one or more compounds shown in general formulas II-1 to II-18:
4. the fast-response, negative-working liquid crystal composition of claim 1, wherein: the compound shown in the general formula III is selected from one or more compounds shown in general formulas III-1 to III-34:
5. the fast-response, negative-working liquid crystal composition of claim 1, wherein: the compound shown in the general formula IV is selected from one or more compounds shown in general formulas IV-1 to IV-19:
6. the fast-response, negative-working liquid crystal composition of claim 1, wherein: in the liquid crystal composition material, 22-40% of the compound shown in the general formula I, 32-38% of the compound shown in the general formula II, 27-40% of the compound shown in the general formula III and 0-16% of the compound shown in the general formula IV.
7. The fast-response, negative-working liquid crystal composition of claim 6, wherein: in the liquid crystal composition material, 23-38% of the compound shown in the general formula I, 33-37% of the compound shown in the general formula II, 28-39% of the compound shown in the general formula III and 0-15% of the compound shown in the general formula IV.
8. Use of a fast-responding negative liquid crystal composition according to any of claims 1-7 for the preparation of a negative-type display mode liquid crystal display device.
9. Use according to claim 8, characterized in that: the liquid crystal display device comprises VA, PSVA, UV2A, IPS and FFS liquid crystal display devices.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007023071A (en) * | 2005-07-12 | 2007-02-01 | Chisso Corp | Liquid crystal composition and liquid crystal display element |
| CN107109233A (en) * | 2015-01-20 | 2017-08-29 | 捷恩智株式会社 | Liquid-crystal composition and liquid crystal display cells |
| CN107835846A (en) * | 2015-07-01 | 2018-03-23 | Dic株式会社 | Composition and use its liquid crystal display cells |
| CN110268314A (en) * | 2017-02-24 | 2019-09-20 | 捷恩智株式会社 | Liquid crystal display element and liquid-crystal composition |
| CN111019670A (en) * | 2018-10-10 | 2020-04-17 | Dic株式会社 | Liquid crystal composition |
| CN112852443A (en) * | 2019-11-27 | 2021-05-28 | Dic株式会社 | Polymerizable liquid crystal composition and liquid crystal display element using same |
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- 2021-08-10 CN CN202110915708.XA patent/CN113637487A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007023071A (en) * | 2005-07-12 | 2007-02-01 | Chisso Corp | Liquid crystal composition and liquid crystal display element |
| CN107109233A (en) * | 2015-01-20 | 2017-08-29 | 捷恩智株式会社 | Liquid-crystal composition and liquid crystal display cells |
| CN107835846A (en) * | 2015-07-01 | 2018-03-23 | Dic株式会社 | Composition and use its liquid crystal display cells |
| CN110268314A (en) * | 2017-02-24 | 2019-09-20 | 捷恩智株式会社 | Liquid crystal display element and liquid-crystal composition |
| CN111019670A (en) * | 2018-10-10 | 2020-04-17 | Dic株式会社 | Liquid crystal composition |
| CN112852443A (en) * | 2019-11-27 | 2021-05-28 | Dic株式会社 | Polymerizable liquid crystal composition and liquid crystal display element using same |
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