CN107177359B - Negative dielectric anisotropy liquid crystal composition containing butenyl bridged bond and application thereof - Google Patents
Negative dielectric anisotropy liquid crystal composition containing butenyl bridged bond and application thereof Download PDFInfo
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- CN107177359B CN107177359B CN201610133747.3A CN201610133747A CN107177359B CN 107177359 B CN107177359 B CN 107177359B CN 201610133747 A CN201610133747 A CN 201610133747A CN 107177359 B CN107177359 B CN 107177359B
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Abstract
The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and application thereof. The compound represented by the general formula I has moderate negative dielectric anisotropy and lower rotational viscosity, can effectively increase the dielectric anisotropy of the liquid crystal composition, and simultaneously reduces the rotational viscosity of the liquid crystal composition; the compound represented by the general formula II has extremely low rotational viscosity, and is the best choice for reducing the rotational viscosity of the liquid crystal composition; the liquid crystal composition provided by the invention has the advantages that the dielectric anisotropy is increased by adding the I-type compound, the moderate rotary viscosity is kept, the use of the rotary viscosity is further reduced by adding the II-type compound, and the purpose of reducing the rotary viscosity of the liquid crystal composition is achieved. The liquid crystal composition can be used for fast response liquid crystal display of various display modes, in particular to VA type liquid crystal display equipment such as MVA, PVA, PS-VA and the like.
Description
Technical Field
The invention relates to a liquid crystal composition, in particular to a nematic phase liquid crystal composition, and specifically provides a liquid crystal composition with negative dielectric anisotropy and faster response time.
Background
Liquid crystals are currently widely used in the field of information display, and have been used in optical communications (s.t.wu, d.k.yang.reflective Liquid Crystal display. wiley, 2001). In recent years, the application fields of liquid crystal compounds have been remarkably widened to various display devices, electro-optical devices, electronic components, sensors, and the like, and nematic liquid crystal compounds have been most widely used in flat panel displays, particularly in systems of TFT active matrix. Liquid crystal display has experienced a long development route along with the discovery of liquid crystals. In 1888, the first liquid crystal material, cholesterol benzoate, was discovered by the austria phytologist Friedrich reintzer. In 1917, Manguin invented rubbing alignment method to make single domain liquid crystal and study optical anisotropy. The theory of scraping (Swarm) was established by e.bose in 1909 and supported by l.s.ormstein and f.zernike et al (1918), which were later discussed as statistical fluctuations by De Gennes. G.w.oseen and h.zocher created continuum theory in 1933 and was perfected by f.c.frank (1958). M.born (1916) and k.lichtennecker (1926) discovered and studied the dielectric anisotropy of liquid crystals. In 1932, w.kast accordingly classified the nematic phase into two main classes, positive and negative. In 1927, v.freedericksz and v.zolonao found that nematic liquid crystals deformed and had a voltage threshold (freedericksz transition) under the action of an electric or magnetic field. This finding provides the basis for the fabrication of liquid crystal displays.
In 1968, R.Williams, RCA corporation in America, discovered that nematic liquid crystals form fringe domains under the action of an electric field and have a light scattering phenomenon. The g.h.heilmeir was subsequently developed into a dynamic scattering display mode and made the first Liquid Crystal Display (LCD) in the world. In the early seventies, Helfrich and Schadt invented the TN principle, and people made them into display devices (TN-LCD) by using the combination of TN photoelectric effect and integrated circuit, thus developing a broad prospect for the application of liquid crystal. Since the seventies, the application of liquid crystal in display has been developed in a breakthrough due to the development of large-scale integrated circuits and liquid crystal materials, and the Super Twisted Nematic (STN) mode proposed by t.scheffer et al in 1983-1985 and the Active Matrix (AM) mode proposed by p.brody in 1972 were adopted again. Conventional TN-LCD technology has been developed into STN-LCD and TFT-LCD technology, and although the number of scan lines of STN can reach 768 lines or more, problems of response speed, viewing angle, gray scale and the like still exist when the temperature rises, so that the active matrix display mode is mostly adopted for large-area, high-information content and color display. TFT-LCD has been widely used in direct view televisions, large screen projection televisions, computer terminal displays and some military instrument displays, and TFT-LCD technology is believed to have wider application prospects. Where "active matrix" includes two types: 1. OMS (metal oxide semiconductor) or other diodes on a silicon chip as a substrate. 2. A Thin Film Transistor (TFT) on a glass plate as a substrate. The use of single crystal silicon as a substrate material limits the display size because of the many problems that arise with the assembly of parts of the display device and even the modules at their junctions. Thus, the second type of thin film transistor is a promising type of active matrix, and the photoelectric effect utilized is typically the TN effect. TFTs include compound semiconductors, such as CdSe, or TFTs based on polycrystalline or amorphous silicon.
At present, the technology of LCD products has matured, and the technical problems of viewing angle, resolution, color saturation and the like are successfully solved, and the display performance of the LCD products is close to or exceeds that of CRT displays. Large-sized and medium-sized LCDs have gradually occupied the mainstream position of flat panel displays in their respective fields.
The response speed is an important evaluation index of the LCD, and the phenomenon of picture smear can occur when the response speed is too slow. Factors that affect the response speed of an LCD include the thickness of the LCD cell, the driving method, and the hybrid liquid crystal selected.
Disclosure of Invention
The invention provides a negative dielectric anisotropy liquid crystal composition, which has lower rotational viscosity, can effectively improve the response speed of a liquid crystal display, improves the phenomenon of image smear and achieves better display effect.
Specifically, the present invention provides a negative dielectric anisotropic liquid crystal composition containing a butenyl bridge, comprising at least one compound represented by the general formula I:
wherein R is1Represents H or C1～C8Wherein 0-4H may be substituted by F;
R2represents H or C1～C8Straight chain alkyl or C2～C8One or two non-adjacent CH2Can be substituted by O, and 0-4 of H can be substituted by F;
A1represents trans-1, 4-cyclohexyl or 1, 4-phenylene when A1When 1,4 phenylene is represented, 0-4H on the benzene ring can be substituted by F;
m is 1-2, n is 0-2 (i.e. m is selected from 1 or 2, n is selected from 0, 1 or 2).
In the liquid crystal composition of the present invention, the compound of formula I is suitably used in an amount of 5 to 75 parts, preferably 20 to 45 parts (herein "part" may also refer to "%").
And at least one compound of formula II:
R3、R4each independently represents C1～C12Wherein one or more non-adjacent CH2May be substituted with O, S or CH ═ CH;
A2、A3each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
In the liquid crystal composition of the present invention, the compound of formula II is suitably used in an amount of 15 to 60 parts, preferably 20 to 55 parts (the "part" herein may also refer to "%").
The compound represented by the general formula I provided by the invention is a butenyl bridged bond compound, and the structure has moderate negative dielectric anisotropy and low rotational viscosity.
Preferably, the compound represented by the general formula I is selected from one or more compounds represented by the following formula:
wherein R is1Represents H or C1～C6The linear alkyl group of (1); r2Represents C1～C6Linear alkyl group of (1).
More preferably, the compound represented by the above general formula I is one or more compounds selected from the group consisting of compounds represented by the following formulae:
the compound represented by the general formula II provided by the invention is of a bicyclic structure, and preferably, the compound represented by the general formula II is selected from one or more of the following compounds:
wherein R is3Represents C1～C7The linear alkyl group of (1); r4Represents C1～C7Linear alkyl, linear alkoxy or C2～C7Linear alkenyl groups of (a).
More preferably, the compound represented by the general formula II is one or more compounds selected from the group consisting of compounds represented by the formulae IIA1 to IIC 24:
the compound represented by the general formula I in the liquid crystal composition provided by the invention is a compound with a butylene bridge bond structure, has moderate negative dielectric anisotropy and lower rotational viscosity, can effectively increase the dielectric anisotropy of the liquid crystal composition, and simultaneously reduces the rotational viscosity of the liquid crystal composition; the compound represented by the general formula II is a two-ring structure, has extremely low rotational viscosity and is used as the optimal choice for reducing the rotational viscosity of the liquid crystal composition; the liquid crystal composition provided by the invention has the advantages that the dielectric anisotropy is increased by adding the I-type compound, the moderate rotary viscosity is kept, the use of the rotary viscosity is further reduced by adding the II-type compound, and the purpose of reducing the rotary viscosity of the liquid crystal composition is achieved.
Preferably, the liquid crystal composition provided by the invention further comprises one or more compounds selected from the structures of the general formula III, so as to help improve the elastic constant and clearing point of the liquid crystal composition:
R5、R6each independently represents C1～C12Wherein one or more non-adjacent CH2May be substituted by O or CH ═ CH.
A4Selected from the following structures:
in the liquid crystal composition of the present invention, the compound of formula III is suitably used in an amount of 0 to 15 parts, preferably 3 to 13 parts (the "part" herein may also refer to "%").
Preferably, the compound represented by formula III is selected from one or more of formulae IIIA to IIIC:
wherein R is5Represents C2～C10A linear alkyl or linear alkenyl group of (a); r6Represents C1～C8Linear alkyl group of (1).
More preferably, the compound represented by formula III is selected from one or more of the structures of formulae IIIA1 to IIIC 30:
further, it is preferred that the liquid crystal composition provided by the present invention further comprises one or more compounds selected from the group consisting of compounds of formula IV:
wherein R is7、R8Each independently represents C1～C12Linear alkyl, alkoxy or C2～C12A linear alkenyl group of (a); a. the5Represents 1, 4-cyclohexylene or 1, 4-phenylene; z1Represents a single bond, CH2CH2Or CH2O。
In the liquid crystal composition of the present invention, the compound of formula IV is suitably used in an amount of 0 to 20 parts, preferably 5 to 20 parts (the "part" herein may also refer to "%").
Preferably, the compound represented by formula IV is selected from one or more of the following compounds:
wherein R is7Represents C1～C7Straight chain alkyl or C2～C7A linear alkenyl group of (a); r8Represents C1～C7Linear alkyl or linear alkoxy groups of (1).
More preferably, the compound of formula IV is selected from one or more of formulae IVA1 to formula IVD 16;
in order to further increase the optical anisotropy of the liquid crystal composition, the liquid crystal composition provided by the present invention preferably further comprises one or more compounds represented by the general formula V:
wherein R is9、R10Each independently represents C1～C12Linear alkyl group of (1).
In the liquid crystal composition of the present invention, the compound of formula V is suitably used in an amount of 0 to 15 parts, preferably 4 to 15 parts (herein "part" may also refer to "%").
Preferably, the compound represented by formula V is selected from one or more of the following structures:
and preferably the liquid crystal composition provided by the present invention further comprises one or more compounds represented by formula VI:
wherein R is11、R12Each independently represents C1～C12Straight chain alkyl, straight chain alkoxy; l is1Represents H or F.
In the liquid crystal composition of the present invention, the compound of formula VI is suitably used in an amount of 0 to 10 parts, preferably 5 to 10 parts (the "part" herein may also refer to "%").
Preferably, the compound represented by formula VI is selected from one or more of VIA and VIB:
wherein R is11、R12Each independently represents C1～C7Straight chain alkyl, straight chain alkoxy; preferably C1～C5Linear alkyl or linear alkoxy groups of (1).
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula VII:
wherein R is13、R14Each independently represents C1～C12Linear alkyl, linear alkoxy or C2～C12A linear alkenyl group of (a); a. the6Selected from the following structures:
A7selected from the following structures:
in the liquid crystal composition of the present invention, the compound of formula VII is suitably used in an amount of 0 to 40 parts, preferably 7 to 20 parts (herein "part" may also refer to "%").
Preferably, the compound represented by formula VII is selected from one or more of the following structures:
wherein R is13Represents C1～C7Straight chain alkyl or C2～C7Linear alkenyl of (3), preferably C2～C5A linear alkyl or linear alkenyl group of (a); r14Represents C1～C7Linear alkyl or alkoxy radical of (1), preferably C1～C5Linear alkyl or linear alkoxy groups of (1).
More preferably, the liquid crystal composition of the present invention further comprises one or more compounds represented by formula VIII:
wherein R is15、R16Each independently represents C1～C12The linear alkyl group of (1); l is2、L3Each independently represents H or F; a. the8Represents 1, 4-cyclohexyl or 1, 4-phenylene.
In the liquid crystal composition of the present invention, the compound of formula VIII is suitably used in an amount of 0 to 10 parts, preferably 5 to 10 parts (herein "part" may also refer to "%").
Preferably, the compound represented by formula VIII is selected from one or more of the following structures:
wherein R is15、R16Each independently represents C1～C7Linear alkyl radical of (1), preferably C2～C5Linear alkyl group of (1).
In addition, the liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula IX:
wherein R is17、R18Each independently represents C1～C12OfAlkanyl, straight alkoxy or C2～C12A linear alkenyl group of (a); preferably, R17Represents C2～C7A straight chain alkenyl group or a straight chain alkyl group of (2), further preferably C2～C5A linear alkyl or linear alkenyl group of (a); r18Represents C1～C7The straight-chain alkyl group or straight-chain alkoxy group of (2), more preferably C1～C5Linear alkyl or linear alkoxy groups of (1).
In the liquid crystal composition of the present invention, the compound of formula IX is suitably used in an amount of 0 to 35 parts, preferably 3 to 20 parts (herein "part" may also refer to "%").
The liquid crystal composition has the following beneficial effects that except that the compounds represented by the general formulas I and II are optional components, other components (such as the compounds shown in the general formulas III to IX) are optional components, and optional modes can be selected in any combination mode, for example, only one, a plurality of or all of the other components are added into the optional components.
In particular, in order to make the liquid crystal composition meet different requirements, the liquid crystal composition provided by the invention further preferably limits the content range of each component in the composition.
The liquid crystal composition comprises the following components in parts by weight: 5 to 80 parts of a compound represented by the general formula I, 15 to 60 parts of a compound represented by the general formula II, 0 to 20 parts of a compound represented by the general formula III, 0 to 25 parts of a compound represented by the general formula IV, 0 to 40 parts of a compound represented by the general formula V, 0 to 15 parts of a compound represented by the general formula VI, 0 to 40 parts of a compound represented by the general formula VII, 0 to 15 parts of a compound represented by the general formula VIII and 0 to 40 parts of a compound represented by the general formula IX;
preferably, the liquid crystal composition provided by the invention comprises the following components: 30 to 70 parts of a compound represented by the general formula I, 30 to 55 parts of a compound represented by the general formula II, 3 to 15 parts of a compound represented by the general formula III, 0 to 18 parts of a compound represented by the general formula IV, 0 to 28 parts of a compound represented by the general formula V, 0 to 15 parts of a compound represented by the general formula VI, and 0 to 10 parts of a compound represented by the general formula VIII.
Or the liquid crystal composition provided by the invention comprises the following components: 20 to 80 parts of a compound represented by the general formula I, 10 to 40 parts of a compound represented by the general formula II, 0 to 15 parts of a compound represented by the general formula III, 0 to 20 parts of a compound represented by the general formula V, 0 to 15 parts of a compound represented by the general formula VIII, and 0 to 35 parts of a compound represented by the general formula IX.
Preferably, the liquid crystal composition provided by the invention comprises the following components: 25 to 75 parts of a compound represented by the general formula I, 15 to 35 parts of a compound represented by the general formula II, 1 to 13 parts of a compound represented by the general formula III, 2 to 18 parts of a compound represented by the general formula V, 0 to 11 parts of a compound represented by the general formula VIII, and 0 to 22 parts of a compound represented by the general formula IX.
Or the liquid crystal composition provided by the invention comprises the following components: 3 to 35 parts of a compound represented by the general formula I, 20 to 40 parts of a compound represented by the general formula II, 0 to 20 parts of a compound represented by the general formula III, 0 to 25 parts of a compound represented by the general formula IV, 0 to 40 parts of a compound represented by the general formula V, 0 to 45 parts of a compound represented by the general formula VII, and 0 to 10 parts of a compound represented by the general formula VIII.
Preferably, the liquid crystal composition provided by the invention comprises the following components: 5 to 32 parts of a compound represented by the general formula I, 25 to 35 parts of a compound represented by the general formula II, 0 to 15 parts of a compound represented by the general formula III, 0 to 22 parts of a compound represented by the general formula IV, 0 to 35 parts of a compound represented by the general formula V, 0 to 40 parts of a compound represented by the general formula VII, and 1 to 8 parts of a compound represented by the general formula VIII.
Or the liquid crystal composition provided by the invention comprises the following components: 10 to 35 parts of a compound represented by the general formula I, 15 to 35 parts of a compound represented by the general formula II, 0 to 15 parts of a compound represented by the general formula III, 10 to 25 parts of a compound represented by the general formula IV, 0 to 15 parts of a compound represented by the general formula V, 0 to 15 parts of a compound represented by the general formula VI, and 20 to 35 parts of a compound represented by the general formula VII.
Preferably, the liquid crystal composition provided by the invention comprises the following components: 15 to 25 parts of a compound represented by the general formula I, 20 to 30 parts of a compound represented by the general formula II, 0 to 12 parts of a compound represented by the general formula III, 15 to 20 parts of a compound represented by the general formula IV, 0 to 12 parts of a compound represented by the general formula V, 0 to 12 parts of a compound represented by the general formula VI, and 25 to 30 parts of a compound represented by the general formula VII.
In the above formula, the compounds represented by the general formulae III to IX are optional components except for the compounds represented by the general formulae I and II, and in each embodiment, 2 to 6 kinds of the above 9 kinds of liquid crystal compounds are usually contained.
In order to obtain a liquid crystal composition with higher quality to further guarantee the application effect, the invention specifically provides the following combination mode:
when the liquid crystal composition of the present invention contains only two components, the preferable formulation is 60 to 70 parts of the compound represented by the general formula I and 30 to 40 parts of the compound represented by the general formula II, preferably 69 parts of the compound represented by the general formula I and 31 parts of the compound represented by the general formula II;
when the liquid crystal composition comprises three components, the ideal formula is 30-35 parts of the compound represented by the general formula I, 25-30 parts of the compound represented by the general formula II and 35-45 parts of the compound represented by the general formula VII; preferably 31 parts of the compound represented by the formula I, 29 parts of the compound represented by the formula II and 40 parts of the compound represented by the formula VII;
when the liquid crystal composition of the present invention contains four components, the preferable formulation is 30 to 45 parts of the compound represented by the general formula I, 40 to 55 parts of the compound represented by the general formula II, 5 to 10 parts of the compound represented by the general formula III, and 5 to 10 parts of the compound represented by the general formula VIII; preferably 32 to 40 parts of the compound represented by the general formula I, 40 to 55 parts of the compound represented by the general formula II, 8 to 10 parts of the compound represented by the general formula III, and 5 to 10 parts of the compound represented by the general formula VIII;
when the liquid crystal composition contains five components, the ideal formula is 30-75 parts of the compound represented by the general formula I, 15-35 parts of the compound represented by the general formula II, 3-10 parts of the compound represented by the general formula III, 4-10 parts of the compound represented by the general formula V and 3-15 parts of the compound represented by the general formula IX;
or 40 to 45 parts of a compound represented by the general formula I, 20 to 25 parts of a compound represented by the general formula II, 8 to 10 parts of a compound represented by the general formula III, 4 to 10 parts of a compound represented by the general formula V and 5 to 10 parts of a compound represented by the general formula VI;
or 40 to 45 parts of a compound represented by the general formula I, 20 to 25 parts of a compound represented by the general formula II, 10 to 15 parts of a compound represented by the general formula V, 5 to 10 parts of a compound represented by the general formula VI and 5 to 10 parts of a compound represented by the general formula VIII;
or 20 to 30 parts of a compound represented by the general formula I, 20 to 30 parts of a compound represented by the general formula II, 10 to 15 parts of a compound represented by the general formula V, 15 to 20 parts of a compound represented by the general formula IV and 15 to 20 parts of a compound represented by the general formula VII;
when the liquid crystal composition comprises six components, the ideal formula is 20-25 parts of the compound represented by the general formula I, 30-35 parts of the compound represented by the general formula II, 10-15 parts of the compound represented by the general formula V, 5-10 parts of the compound represented by the general formula VI, 5-10 parts of the compound represented by the general formula VIII and 15-20 parts of the compound represented by the general formula IX;
or 20 to 25 parts of a compound represented by the general formula I, 20 to 30 parts of a compound represented by the general formula II, 15 to 20 parts of a compound represented by the general formula IV, 5 to 10 parts of a compound represented by the general formula VI, 20 to 25 parts of a compound represented by the general formula VII, and 5 to 10 parts of a compound represented by the general formula VIII;
or 5 to 20 parts of a compound represented by the general formula I, 20 to 35 parts of a compound represented by the general formula II, 10 to 13 parts of a compound represented by the general formula III, 5 to 15 parts of a compound represented by the general formula IV, 7 to 15 parts of a compound represented by the general formula VII, and 20 to 35 parts of a compound represented by the general formula IX;
or 20 to 25 parts of a compound represented by the general formula I, 20 to 25 parts of a compound represented by the general formula II, 15 to 20 parts of a compound represented by the general formula IV, 10 to 15 parts of a compound represented by the general formula V, 15 to 20 parts of a compound represented by the general formula VII, and 5 to 10 parts of a compound represented by the general formula VIII;
in each specific formula, the total weight part is preferably 100 parts.
The above weight parts are one of μ g, mg, g and kg known in the art, or multiples thereof, such as 1/100, 1/10, 10, 100, etc.
Within the above range, a negative dielectric anisotropic liquid crystal composition having a low rotational viscosity and a large elastic constant can be obtained, and a liquid crystal display using the liquid crystal composition has a fast response time.
The method for producing the liquid crystal composition of the present invention is not particularly limited, and it can be produced by mixing two or more compounds by a conventional method, such as a method of mixing the different components at a high temperature and dissolving each other, wherein the liquid crystal composition is dissolved and mixed in a solvent for the compounds, and then the solvent is distilled off under reduced pressure; alternatively, the liquid crystal composition of the present invention can be prepared by a conventional method, for example, by dissolving the component having a smaller content in the main component having a larger content at a higher temperature, or by dissolving each of the components in an organic solvent, for example, acetone, chloroform or methanol, and then mixing the solutions to remove the solvent.
The liquid crystal composition has low rotational viscosity, large elastic constant, good low-temperature intersolubility and high response speed, can be used for fast response liquid crystal display of various display modes, and is preferably suitable for IPS, FFS or VA type liquid crystal display equipment. The composition of the invention can obviously improve the display effect of the liquid crystal display when used in the liquid crystal display device, especially VA type liquid crystal display devices such as MVA, PVA, PS-VA and the like. When the method is suitable for PS-VA type display equipment, one or more reactive mesomorphic compounds with the mass ratio of 0.01-5% can be added.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the present invention, the percentages are by weight, the temperature is given in degrees Celsius, △ n represents the optical anisotropy (25 ℃), △ represents the dielectric anisotropy (25 ℃, 1000Hz), V, unless otherwise stated10The representative threshold voltage is a characteristic voltage (V) when the relative transmittance is changed by 10%25 ℃); γ 1 represents rotational viscosity (mpa.s, 25 ℃); cp represents the clearing point (. degree. C.) of the liquid crystal composition; k11、K22、K33Respectively representing the splay, twist and bend elastic constants (pN, 25 ℃).
In the following examples, the group structures in the liquid crystal compounds are represented by codes shown in Table 1.
Table 1: radical structure code of liquid crystal compound
Take the following compound structure as an example:
expressed as: 2VCV2PWO2
Expressed as: 3CPWO1
In the following examples, the liquid crystal composition was prepared by a thermal dissolution method, comprising the steps of: weighing the liquid crystal compound by a balance according to the weight percentage, wherein the weighing and adding sequence has no specific requirements, generally weighing and mixing the liquid crystal compound in sequence from high melting point to low melting point, heating and stirring at 60-100 ℃ to uniformly melt all the components, filtering, performing rotary evaporation, and finally packaging to obtain the target sample.
In the following examples, the weight percentages of the components in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following tables.
In the following examples, all components referred to are known liquid crystalline compounds, available from the Beijing octagon space-time supplier or from other commercial sources.
Example 1
Table 2: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 2
Table 3: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 3
Table 4: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 4
Table 5: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 5
Table 6: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 6
Table 7: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 7
Table 8: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 8
Table 9: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 9
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 10
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 11
Table 12: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 12
Table 13: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 13
Table 14: the weight percentage and performance parameters of each component in the liquid crystal composition
Example 14
For the preparation of a PS-VA mixture, 99.7% of the mixture according to example 4 are mixed with 0.3% of a polymerizable compound of the formula
Example 15
For the preparation of a PS-VA mixture, 99.8% of the mixture according to example 11 are mixed with 0.2% of a polymerizable compound of the formula
Comparative example 1
Table 15: the weight percentage and performance parameters of each component in the liquid crystal composition
The liquid crystal compositions obtained in example 1 and comparative example 1 were compared together for each of their performance parameter values, see table 16.
Table 16: comparison of Performance parameters of liquid Crystal compositions
| △n | △ε | Cp | γ1 | K11 | K22 | K33 | |
| Example 1 | 0.100 | -2.8 | 76 | 46 | 13.6 | 6.8 | 13.8 |
| Comparative example 1 | 0.099 | -2.7 | 74 | 66 | 12.8 | 6.4 | 13.6 |
By comparison, it can be seen that: example 1 provides a liquid crystal composition having a low rotational viscosity, i.e., having a faster response time, compared to comparative example 1.
From the above embodiments, the liquid crystal composition provided by the present invention has low viscosity, high resistivity, suitable optical anisotropy, good low-temperature intersolubility, large elastic constant, and excellent light stability and thermal stability, and can reduce the response time of the liquid crystal display, thereby solving the problem of slow response speed of the liquid crystal display. Therefore, the liquid crystal composition provided by the invention is suitable for fast-response IPS and FFS and VA type liquid crystal display equipment such as MVA, PVA, PS-VA and the like, and is particularly suitable for fast-response liquid crystal display equipment.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. A negative dielectric anisotropy liquid crystal composition, characterized by: the liquid crystal composition comprises the following components in parts by weight:
2. a negative dielectric anisotropy liquid crystal composition, characterized by: the liquid crystal composition comprises the following components in parts by weight:
3. use of the liquid crystal composition of claim 1 or 2 in a liquid crystal display device.
4. Use according to claim 3, characterized in that: the liquid crystal display device is an IPS, FFS or VA type liquid crystal display.
5. Use according to claim 4, characterized in that: the VA type liquid crystal display is MVA, PVA and PS-VA.
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| CN113717735B (en) * | 2021-08-12 | 2023-08-08 | 烟台显华科技集团股份有限公司 | Positive dielectric anisotropic liquid crystal compound, liquid crystal composition and liquid crystal display device |
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| CN102203214B (en) * | 2009-06-03 | 2013-07-24 | 烟台万润精细化工股份有限公司 | Butene-based liquid crystal compounds |
| US20160040067A1 (en) * | 2014-08-08 | 2016-02-11 | Jnc Petrochemical Corporation | Liquid crystal compound having butene-bonding group, liquid crystal composition and liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102203214B (en) * | 2009-06-03 | 2013-07-24 | 烟台万润精细化工股份有限公司 | Butene-based liquid crystal compounds |
| US20160040067A1 (en) * | 2014-08-08 | 2016-02-11 | Jnc Petrochemical Corporation | Liquid crystal compound having butene-bonding group, liquid crystal composition and liquid crystal display device |
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