CN107267157B - Negative dielectric anisotropy liquid crystal composition and application thereof - Google Patents

Negative dielectric anisotropy liquid crystal composition and application thereof Download PDF

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CN107267157B
CN107267157B CN201610219082.8A CN201610219082A CN107267157B CN 107267157 B CN107267157 B CN 107267157B CN 201610219082 A CN201610219082 A CN 201610219082A CN 107267157 B CN107267157 B CN 107267157B
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陈卯先
王杰
储士红
未欣
陈海光
姜天孟
郭云鹏
袁瑾
伍嘉琦
田会强
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Beijing Bayi Space LCD Technology Co Ltd
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    • C09K19/00—Liquid crystal materials
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    • 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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    • 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
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Abstract

The invention provides a negative dielectric anisotropy liquid crystal composition and application thereof, wherein the liquid crystal composition comprises at least one of compounds represented by a general formula I, at least one of compounds represented by a general formula II, at least one of compounds represented by a general formula III, and at least one of compounds represented by a general formula IV:

Description

Negative dielectric anisotropy liquid crystal composition and application thereof
Technical Field
The invention belongs to the technical field of liquid crystal materials, and particularly relates to a negative dielectric anisotropy liquid crystal composition and application thereof.
Background
liquid crystals are widely used in the field of information display, and also in optical communication (s.t.wu, d.k.yang.reflective L essential display.wiley, 2001). in recent years, the application fields of liquid Crystal compounds have been significantly widened to various display devices, electro-optical devices, electronic components, sensors, etc., and nematic liquid Crystal compounds have been most widely used in flat panel displays, particularly in TFT active matrix systems.
the inventors of Austrian botanicals Friedrich reintzer discovered the first liquid crystal material cholesterol benzoate in 1888, the rubbing alignment method was invented in 1917 to produce a single domain liquid crystal and to study the optical anisotropy.Free pages established the theory of chiral (Swarm) and obtained the experimental support of L.S.Ormstein and F.Zernike et al (1918), and later discussed as statistical fluctuations by De Gennes, G.W.Osen and H.Zocher created the continuum theory in 1933, and obtained the perfection of F.C.Frank (1958), M.born (1916) and K.L. ichtennecker (1926) to find and study the dielectric anisotropy of liquid crystals, and found and studied the negative phase transformation of liquid crystals as well as the negative phase transformation of liquid crystals, and the negative phase transformation of liquid crystals was produced in 193V.1927.
in 1968, the american RCA company r.williams discovered that Nematic liquid crystal forms fringe domains under the action of electric field and has light scattering phenomenon, g.h. heilmeir developed it into dynamic scattering display mode and made the first liquid crystal display (L CD) in the world, early seventies, Helfrich and Schadt invented TN principle, which was made into display device (TN-L CD) by using TN photoelectric effect in combination with integrated circuit, developing a broad prospect for liquid crystal application since seventies, liquid crystal application made a breakthrough due to the development of large scale integrated circuit and liquid crystal material, large screen Active matrix (STN) mode proposed successively in t.schfer et al in 1983-1985 and large screen Active matrix (Active matrix) mode proposed in p.brody in 1972 were newly adopted CD, conventional Active matrix (Active matrix: AM) technology was developed into CD, conventional Active matrix (STN-L) technology was adopted for tv terminal, and tv display technology was widely used for tv display, tv display has been widely used for tv display, tv display has had the problem of wide viewing angle, tv display technology has been increased, tv display technology has been widely adopted tv display technology, tv display technology has been widely used for tv display, tv display technology has been widely used for tv display technology, tv display technology has been used for tv display technology, tv display technology has been widely used for tv display technology, tv display technology has been.
Where "active matrix" includes two types: 1. OMS (metal oxide semiconductor) or other diodes on a silicon wafer 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, large-size TV-type liquid crystal displays mainly use a VA (vertical alignment) mode and an FFS (fringe field effect) mode, the VA-type display has very excellent contrast performance and is very beneficial to improving the display effect of the liquid crystal display, and the current VA-type display technology is basically mature, but the response time problem encountered by the VA-type display keeps hindering the progress of the display technology.
Disclosure of Invention
The invention aims to solve the problem of response time of a liquid crystal display and provides a negative dielectric anisotropy liquid crystal composition which has quick response time.
In order to achieve the above purpose, one of the technical solutions of the present invention is: a negative dielectric anisotropy liquid crystal composition comprises at least one of compounds represented by a general formula I, at least one of compounds represented by a general formula II, at least one of compounds represented by a general formula III, and at least one of compounds represented by a general formula IV:
Figure BDA0000961268600000021
Wherein R is 1、R2、R3、R4、R5、R6Each independently represents C 1～C12Linear alkyl, alkoxy of (a); A. b, C each independently represents trans-1, 4-cyclohexyl or 1, 4-phenylene; r 7、R8Each independently represents C 1～C12Linear alkyl group of (1).
The compound represented by the general formula I provided by the invention is a two-ring 2, 3-difluorobenzene compound, and the structure has larger negative dielectric anisotropy.
Specifically, the compound represented by the general formula I is selected from one or more compounds represented by formulas IA to IB:
Figure BDA0000961268600000031
Wherein R is 1Represents C 1～C7Linear alkyl radical of (2), R 2Represents C 1～C7Linear alkyl or linear alkoxy of (a); preferably, R 1Represents C 1～C5Linear alkyl radical of (2), R 2Represents C 1～C2Straight chain alkyl or C 1～C4Linear alkoxy groups of (1).
Preferably, the compound represented by the general formula I is one or more compounds selected from the group consisting of compounds represented by formula IA1 to formula IB 16:
Figure BDA0000961268600000032
Figure BDA0000961268600000041
More preferably, the compounds of formula I provided by the present invention are selected from one or more of formulae IA14, IA16, IA22, IB6, IB8, IB 10.
In the liquid crystal composition, the compound represented by the general formula I is added in an amount of 5-50%, or 15-40%, or 10-34%, or 20-30%, or 8-40%, preferably 10-34%, and more preferably 20-34% or 10-16% by weight.
The compound represented by the general formula II provided by the invention is of a tricyclic 2, 3-difluorobenzene structure, and the structure has large negative dielectric anisotropy and high clearing point.
Wherein, in the general formula II, R 3Represents C 1～C7Linear alkyl radical of (2), R 4Represents C 1～C7Linear alkyl or linear alkoxy of (a); preferably, R 3Represents C 1～C5Linear alkyl radical of (2), R 4Represents C 1～C2Straight chain alkyl or C 1～C4Linear alkoxy groups of (1).
Preferably, the compound represented by the general formula II is one or more compounds selected from the group consisting of compounds represented by formula IIA 1-formula IIA 24:
Figure BDA0000961268600000042
Figure BDA0000961268600000051
More preferably, the compound represented by the general formula II provided by the invention is selected from one or more of the group consisting of IIA1, IIA2, IIA 9-IIA 18.
In the liquid crystal composition, the compound represented by the general formula II is added in an amount of 5 to 60% by weight, or 15 to 55% by weight, or 10 to 50% by weight, or 12 to 44% by weight, or 12 to 48% by weight, preferably 12 to 48% by weight, and more preferably 23 to 48% by weight, or 12 to 17% by weight.
The compound represented by the general formula III provided by the invention has a bicyclic structure, and the structure has low rotational viscosity.
Specifically, the compound represented by the general formula III is selected from one or more of the following compounds:
Figure BDA0000961268600000052
Wherein R is 5Represents C 1～C7The linear alkyl group of (1); r 6Represents C 1～C7Straight-chain alkyl, straight-chain alkoxy of (1); preferably, R 5Represents C 2～C5The linear alkyl group of (1); r 6Represents C 1～C5Straight chain alkyl or C 1～C2Linear alkoxy groups of (1).
Preferably, the compound represented by the general formula III is one or more compounds selected from the group consisting of compounds represented by the formulas IIIA1 to IIIC 14:
Figure BDA0000961268600000053
Figure BDA0000961268600000061
More preferably, the compound represented by the general formula III provided by the present invention is selected from one or more of formulae IIIA2, IIIA6, IIIA7, IIIB18, IIIB22, IIIC2, and IIIC 4.
In the liquid crystal composition, the compound represented by the general formula III is added in an amount of 5 to 70% by weight, or 10 to 29% by weight, or 20 to 60% by weight, or 13 to 29% by weight, or 13 to 53% by weight, or 10 to 55% by weight, preferably 13 to 53% by weight, and more preferably 13 to 29% by weight or 45 to 53% by weight.
The compound represented by the general formula IV is a terphenyl structure, and the compound has large optical anisotropy.
Wherein R is 7、R8Each independently represents C 1～C7Preferably, R 7、R8Each independently represents C 1～C5Linear alkyl group of (1).
Preferably, the compound represented by formula IV is selected from one or more of formulae IVA 1-IVA 14:
Figure BDA0000961268600000071
More preferably, the compound represented by formula IV is selected from one or more of formulae IVA3, IVA 4.
In the liquid crystal composition, the compound represented by the general formula IV is added in an amount of 1-25% by weight, or 2-10% by weight, or 1-20% by weight, or 3-15% by weight, preferably 3-15% by weight, and more preferably 3-8% by weight or 8-15% by weight.
The liquid crystal composition provided by the invention also comprises one or more compounds represented by the general formula V:
Figure BDA0000961268600000072
Wherein R is 9Represents C 1～C12Straight chain alkyl or C 2～C12Linear alkenyl of (A), R 10Represents C 1～C12The linear alkyl group of (1); d represents trans-1, 4-cyclohexyl or 1, 4-phenylene.
The compound represented by the general formula V is a tricyclic neutral compound, and the structure has a high clearing point and a large elastic constant.
Specifically, the compound represented by formula V is selected from one or more of compounds represented by formula VA or formula VB:
Figure BDA0000961268600000073
Wherein R is 9Represents C 2～C7A linear alkyl or linear alkenyl group of (a); r 10Represents C 1～C7The linear alkyl group of (1); preferably, R 9Represents C 2～C5Straight chain alkyl or C 2～C4A linear alkenyl group of (a); r 10Represents C 1～C5Linear alkyl group of (1).
Preferably, the compound represented by the general formula V is selected from one or more of structures of formula VA 1-formula VB 22:
Figure BDA0000961268600000074
Figure BDA0000961268600000081
More preferably, the compound of the general formula V provided by the present invention is selected from one or more of VA1, VA2, VA8, VA12, VA16, VB3, VB12, VB16, and VB 18.
In the liquid crystal composition, the general formula V is an optional additive component, and the compound represented by the general formula V is added in an amount of 0-35%, or 0-20%, or 0-30%, or 0-10%, or 0-24% in percentage by weight, and when the component is added, the amount is 4-24%, preferably 4-6%, or 7-24%.
Specifically, in order to enable the liquid crystal composition to meet different requirements, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-50% of one or more compounds represented by the general formula I;
(2) 5-60% of one or more compounds represented by the general formula II;
(3) 5-70% of one or more compounds represented by the general formula III;
(4) 1-25% of one or more compounds represented by the general formula IV;
(5) And 0-35% of one or more compounds represented by the general formula V.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 15-40% of one or more compounds represented by the general formula I;
(2) 15-55% of one or more compounds represented by the general formula II;
(3) 10-29% of one or more compounds represented by the general formula III;
(4) 2-10% of one or more compounds represented by a general formula IV;
(5) And 0-20% of one or more compounds represented by the general formula V.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-35% of one or more compounds represented by the general formula I;
(2) 10-50% of one or more compounds represented by the general formula II;
(3) 20-60% of one or more compounds represented by the general formula III;
(4) 1-20% of one or more compounds represented by the general formula IV;
(5) And 0-30% of one or more compounds represented by the general formula V.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-34% of one or more compounds represented by the general formula I;
(2) 23-48% of one or more compounds represented by the general formula II;
(3) 13-29% of one or more compounds represented by the general formula III;
(4) 3-8% of one or more compounds represented by a general formula IV;
(5) And 0-10% of one or more compounds represented by the general formula V.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 20-34% of one or more compounds represented by the general formula I;
(2) 23-48% of one or more compounds represented by the general formula II;
(3) 13-29% of one or more compounds represented by the general formula III;
(4) 3-8% of one or more compounds represented by a general formula IV;
(5) And 4-6% of one or more compounds represented by the general formula V.
Or, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 10-30% of one or more compounds represented by the general formula I;
(2) 12-44% of one or more compounds represented by the general formula II;
(3) 20-53% of one or more compounds represented by the general formula III;
(4) 3-15% of one or more compounds represented by a general formula IV;
(5) And 0-24% of one or more compounds represented by the general formula V.
Or, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 5-40% of one or more compounds represented by the general formula I;
(2) 10-50% of one or more compounds represented by the general formula II;
(3) 10-55% of one or more compounds represented by the general formula III;
(4) 2-20% of one or more compounds represented by a general formula IV;
(5) And 1-25% of one or more compounds represented by the general formula V.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 10-30% of one or more compounds represented by the general formula I;
(2) 12-44% of one or more compounds represented by the general formula II;
(3) 15-53% of one or more compounds represented by the general formula III;
(4) 3-15% of one or more compounds represented by a general formula IV;
(5) And 4-24% of one or more compounds represented by the general formula V.
Or, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 8-40% of one or more compounds represented by the general formula I;
(2) 10-50% of one or more compounds represented by the general formula II;
(3) 10-55% of one or more compounds represented by the general formula III;
(4) 2-20% of one or more compounds represented by a general formula IV;
(5) And 0-30% of one or more compounds represented by the general formula V.
Preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 10-34% of one or more compounds represented by the general formula I;
(2) 12-48% of one or more compounds represented by the general formula II;
(3) 13-53% of one or more compounds represented by a general formula III;
(4) 3-15% of one or more compounds represented by a general formula IV;
(5) And 0-24% of one or more compounds represented by the general formula V.
More preferably, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 10-34% of one or more compounds represented by the general formula I;
(2) 12-48% of one or more compounds represented by the general formula II;
(3) 13-53% of one or more compounds represented by a general formula III;
(4) 3-15% of one or more compounds represented by a general formula IV;
(5) And 4-24% of one or more compounds represented by the general formula V.
Or, the liquid crystal composition provided by the invention comprises the following components in percentage by mass:
(1) 10-16% of one or more compounds represented by the general formula I;
(2) 12-17% of one or more compounds represented by the general formula II;
(3) 45-53% of one or more compounds represented by a general formula III;
(4) 8-15% of one or more compounds represented by a general formula IV;
(5) And 7-24% of one or more compounds represented by the general formula V.
The compound of the general formula I is a bicyclic negative dielectric anisotropic liquid crystal compound, has high negative dielectric anisotropy and low rotational viscosity, and has the advantage of excellent intersolubility; the compound of the general formula III has low rotational viscosity, and the compound of the general formula IV has large optical anisotropy, so that the optical anisotropy of the liquid crystal composition is effectively improved.
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 second technical scheme of the invention is as follows: the liquid crystal composition is applied to VA, IPS and FFS mode displays.
Preferably, the VA mode display is one or more of VA, MVA, PVA, PSVA.
The liquid crystal composition has the advantages of large elastic constant, low rotational viscosity and excellent quality stability, and can obviously improve the display effect of a liquid crystal display.
The liquid crystal compounds involved in the present invention are all known products, commercially available or available from the Beijing Baybigos space-time liquid Crystal technology GmbH.
On the basis of the common knowledge in the field, the above preferred conditions can be combined with each other to obtain the preferred embodiments of the invention.
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, percentages are by weight, temperature is in degrees centigrade, Δ n represents optical anisotropy (25 ℃); ∥And ⊥respectively representing parallel and perpendicular dielectric constants (25 ℃, 1000Hz), △ representing dielectric anisotropy (25 ℃, 1000Hz), gamma 1 representing rotational viscosity (mPa. s, 25 ℃), Cp representing clearing point (. degree. C.) of the liquid crystal composition, K 11、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
Figure BDA0000961268600000121
Figure BDA0000961268600000131
Take the following compound structure as an example:
Figure BDA0000961268600000132
Expressed as: 3CPWO2
Figure BDA0000961268600000133
Expressed as: 2PWP3
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.
Example 1
Table 2: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000141
Example 2
Table 3: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000142
Example 3
Table 4: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000143
Figure BDA0000961268600000151
Example 4
Table 5: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000152
Example 5
Table 6: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000153
Figure BDA0000961268600000161
Example 6
Table 7: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000162
Example 7
Table 8: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000163
Figure BDA0000961268600000171
Example 8
Table 9: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000172
Example 9
Table 10: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000173
Example 10
Table 11: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000174
Figure BDA0000961268600000181
Example 11
Table 12: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000182
Example 12
Table 13: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000183
Figure BDA0000961268600000191
Example 13
Table 14: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000192
Example 14
Table 15: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000193
Example 15
Table 16: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000201
Comparative example 1
Table 17: the weight percentage and performance parameters of each component in the liquid crystal composition
Figure BDA0000961268600000202
The liquid crystal compositions obtained in example 1 and comparative example 1 were compared together for each of their performance parameter values, see Table 18.
Table 18: comparison of Performance parameters of liquid Crystal compositions
Figure BDA0000961268600000203
Figure BDA0000961268600000211
By comparison, it can be seen that: compared with the comparative example 1, the example 1 has larger optical anisotropy, so that the lower thickness of the liquid crystal layer can be matched, and the response time of the liquid crystal display is greatly improved; meanwhile, example 1 has a lower rotational viscosity, further improving the response time of the liquid crystal display.
From the above embodiments, the negative dielectric anisotropy liquid crystal composition provided by the invention has large optical anisotropy, low rotational viscosity and large elastic constant, thereby reducing the thickness of the liquid crystal layer of the liquid crystal display and improving the response time. Therefore, the liquid crystal composition provided by the invention is suitable for VA type liquid crystal displays such as VA, MVA, PVA, CPA, PSVA and the like and IPS and FFS type TFT liquid crystal display devices, and can obviously improve the response time of the liquid crystal display and improve the display effect of the liquid crystal display.
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 and improvements can 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 (3)

1. The negative dielectric anisotropy liquid crystal composition is characterized by comprising the following components in percentage by mass:
Figure FDA0002384293520000011
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000021
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000022
Figure FDA0002384293520000031
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000032
Figure FDA0002384293520000041
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000042
Figure FDA0002384293520000051
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000052
Figure FDA0002384293520000061
Or, the composition comprises the following components in percentage by mass:
Figure FDA0002384293520000062
Figure FDA0002384293520000071
2. Use of the negative dielectric anisotropic liquid crystal composition of claim 1 in VA, IPS, FFS mode displays.
3. Use according to claim 2, characterized in that: the VA mode display is one or more of VA, MVA, PVA and PSVA.
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