CN114574220B - Liquid crystal composition and liquid crystal display device thereof - Google Patents
Liquid crystal composition and liquid crystal display device thereof Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 161
- 239000000203 mixture Substances 0.000 title claims abstract description 119
- 150000001875 compounds Chemical class 0.000 claims abstract description 86
- 125000004432 carbon atom Chemical group C* 0.000 claims description 96
- 125000000217 alkyl group Chemical group 0.000 claims description 51
- 125000003545 alkoxy group Chemical group 0.000 claims description 22
- 229910052736 halogen Inorganic materials 0.000 claims description 11
- 150000002367 halogens Chemical class 0.000 claims description 11
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- -1 substituted Chemical class 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 17
- 230000003287 optical effect Effects 0.000 abstract description 15
- 238000012360 testing method Methods 0.000 description 35
- 125000003342 alkenyl group Chemical group 0.000 description 18
- 238000009472 formulation Methods 0.000 description 14
- 239000000758 substrate Substances 0.000 description 14
- 238000011056 performance test Methods 0.000 description 12
- 210000004027 cell Anatomy 0.000 description 9
- 239000004611 light stabiliser Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 125000004438 haloalkoxy group Chemical group 0.000 description 3
- 125000001188 haloalkyl group Chemical group 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 125000004955 1,4-cyclohexylene group Chemical group [H]C1([H])C([H])([H])C([H])([*:1])C([H])([H])C([H])([H])C1([H])[*:2] 0.000 description 1
- 125000005449 2-fluoro-1,4-phenylene group Chemical group [H]C1=C([*:2])C([H])=C(F)C([*:1])=C1[H] 0.000 description 1
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 101100208473 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) lcm-2 gene Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000003302 alkenyloxy group Chemical group 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000000262 haloalkenyl group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- ONCZDRURRATYFI-QTCHDTBASA-N methyl (2z)-2-methoxyimino-2-[2-[[(e)-1-[3-(trifluoromethyl)phenyl]ethylideneamino]oxymethyl]phenyl]acetate Chemical compound CO\N=C(/C(=O)OC)C1=CC=CC=C1CO\N=C(/C)C1=CC=CC(C(F)(F)F)=C1 ONCZDRURRATYFI-QTCHDTBASA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 230000000007 visual effect Effects 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
-
- 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
- C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
-
- 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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Substances (AREA)
Abstract
The invention provides a liquid crystal composition and a liquid crystal display device thereof, wherein the liquid crystal composition comprises at least one compound of a general formula I and at least one compound of a general formula N. The liquid crystal composition has better optical anisotropy, higher clearing point, lower rotational viscosity, shorter response time and gradient factor value which is closer to 1 under the condition of maintaining proper absolute value of dielectric anisotropy, so that a liquid crystal display device comprising the liquid crystal composition has better contrast ratio, wider usable temperature range, quicker response speed, steeper electro-optical curve, stronger multiplex addressing capability and larger information display quantity.
Description
Technical Field
The invention relates to the field of liquid crystals, in particular to a liquid crystal composition and a liquid crystal display device comprising the liquid crystal composition.
Background
The liquid crystal display device can be used for various household electrical appliances such as a timepiece and an electronic calculator, a measuring device, an automobile panel, a word processor, a computer, a printer, a television, and the like. The liquid crystal display element can be classified into types of PC (PHASE CHANGE, phase transition), TN (TWIST NEMATIC, twisted nematic), STN (super TWISTED NEMATIC ), ECB (ELECTRICALLY CONTROLLED BIREFRINGENCE, electrically controlled birefringence), OCB (optically compensated bend ), IPS (in-PLANE SWITCHING, in-plane transition), VA (VERTICAL ALIGNMENT ), and the like according to the types of display modes. Liquid crystal display elements can be classified into a PM (passive matrix) type and an AM (active matrix) type according to the driving method of the elements. PM is classified into static (static) and multiplex (multiplex) types. AM is classified into TFT (thin film transistor ), MIM (metal insulator metal, metal-insulator-metal) and the like. The types of TFTs include amorphous silicon (amorphous silicon) and polysilicon (polycrystal silicon). The latter is classified into a high temperature type and a low temperature type according to the manufacturing process. The liquid crystal display element can be classified into a reflective type using natural light, a transmissive type using background light, and a semi-transmissive type using both natural light and backlight light sources, according to the type of light source.
When no external electric field is generated, the visible light wavelength is far smaller than the twist pitch of nematic liquid crystal, and when linearly polarized light is vertically incident, if the polarization direction is the same as the orientation of molecules on the upper surface of the liquid crystal box, the linearly polarized light is gradually deflected by 90 degrees along with the direction of the liquid crystal molecular axis, and is emitted in parallel to the direction of the molecular axis on the lower surface of the liquid crystal box. If the polarization direction of the analyzer is parallel to the polarization direction of the polarizer, then light cannot pass through the analyzer, and this arrangement is referred to as "black state" (normally black type of black matrix white); if the polarization direction of the analyzer is perpendicular to the polarization direction of the polarizer, light will pass completely through the analyzer, and this arrangement is called "white state" (normally white type of black-on-white).
The effective value of the applied driving voltage when the variation of the luminance of the display portion of the liquid crystal display device reaches 10% of the maximum variation amount is referred to as a threshold voltage (V th), and the effective value of the applied driving voltage when the variation of the luminance of the display portion of the liquid crystal display device reaches 90% of the maximum variation amount is referred to as a saturation voltage (V sat).
The steepness of the change in the electro-optic curve is measured by a steepness factor P (p=v sat/Vth). The steepness factor P is an important parameter when the liquid crystal display device is used for large information capacity display, and the closer the value is to 1, the stronger the multiplex addressing capability is, and the larger the information amount is displayed.
The optical anisotropy of the liquid crystal composition is related to the contrast of the liquid crystal display element. Depending on the display mode of the liquid crystal display element, a large optical anisotropy or a small optical anisotropy (i.e., appropriate optical anisotropy) is required. The product (Δn×d) of the optical anisotropy (Δn) of the liquid crystal composition and the cell thickness (d) of the liquid crystal display element is designed to maximize the contrast ratio. The value of the product is dependent on the type of operation mode, and a liquid crystal composition having a large optical anisotropy is preferable for a liquid crystal display element having a small cell thickness.
Contrast refers to the ratio between the brightest and darkest areas of an image, the greater the ratio, the more gradation from black to white, and thus the richer the color appearance. The impact of contrast on visual effects is critical. In general, the larger the contrast, the clearer and more striking the image, and the more vivid and gorgeous the color; if the contrast is small, the whole picture is gray. The high contrast ratio is helpful for the definition, detail expression and gray level expression of the image. The higher the contrast ratio is, the better the image effect is, and the more saturated the color is; conversely, if the contrast is low, the picture will appear blurred and the color will be unclear.
The liquid crystal display element contains a liquid crystal composition having a nematic phase, and the liquid crystal composition has appropriate characteristics. By improving the characteristics of the liquid crystal composition, an AM element having good characteristics can be obtained. The characteristics of the liquid crystal composition are further described based on a commercially available AM element. The temperature range of the nematic phase is associated with the temperature range in which the liquid crystal display element can be used. The preferred upper temperature limit of the nematic phase is above about 70℃and the preferred lower temperature limit of the nematic phase is below about-10 ℃.
The liquid crystal composition having a small viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, it can be applied to animation display. In addition, when the liquid crystal composition is injected into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved. The rotational viscosity γ1 directly affects the response time of the liquid crystal composition after power-up, wherein both the rise time (τ on) and the fall time (τ off) are directly proportional to the rotational viscosity γ1 of the liquid crystal composition. Since the rise time (τ on) is related to the cell and the drive voltage, the rise time (τ on) can be adjusted by increasing the drive voltage and decreasing the cell thickness of the cell. The fall time (τ off) is independent of the driving voltage, and is mainly related to the elastic constant of the liquid crystal composition and the cell thickness of the liquid crystal cell, the fall time (τ off) is reduced when the cell thickness tends to be thin, and the fall time (τ off) in the three modes of TN, IPS, VA is inversely related to the average elastic constant, the torsional elastic constant and the bending elastic constant respectively.
From the preparation point of the liquid crystal material, each property of the liquid crystal material is influenced by the mutual constraint, and other properties may be changed due to the improvement of a certain performance index. Thus, the preparation of liquid crystal materials with suitable properties in all respects often requires creative effort.
Disclosure of Invention
The invention aims to: the object of the present invention is to provide a liquid crystal composition having a better optical anisotropy, a higher clearing point, a lower rotational viscosity, a shorter response time and a steepness factor value closer to 1 while maintaining a suitable absolute value of dielectric anisotropy.
The invention also aims to provide a liquid crystal display device comprising the liquid crystal composition.
The technical scheme is as follows: in order to achieve the above object, the present invention provides a liquid crystal composition comprising:
At least one compound of the formula I
And
At least one compound of the formula N
Wherein,
R 1、R2、RN1 and R N2 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, One or non-adjacent two or more-CH 2 -of the straight-chain or branched-chain alkyl groups containing 1 to 12 carbon atoms may be each independently replaced by-ch=ch-, -c≡c-, -O-, -CO-O-or-O-CO-;
Ring(s) Ring/>And Ring/>Each independently represents/> Wherein/>Wherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>Wherein-H may be independently replaced by-F, -Cl or-CN, and-ch=in one or more rings may be independently replaced by-n=;
Z 1、Z2、ZN1 and Z N2 each independently represent a single bond 、-CO-O-、-O-CO-、-CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2CF2-、-(CH2)4-、-CF2O- or-OCF 2 -;
L 1 and L 2 each independently represent halogen, haloalkyl having 1 to 3 carbon atoms, or haloalkoxy having 1 to 3 carbon atoms;
l N1 and L N2 each independently represent-CN, halogen, haloalkyl having 1 to 3 carbon atoms, or haloalkoxy having 1 to 3 carbon atoms;
l N3 and L N4 each independently represent-H, halogen, alkyl having 1 to 3 carbon atoms, or alkoxy having 1 to 3 carbon atoms;
n 1 and n 2 each independently represent 1 or 2, wherein when n 1 represents 2, the ring Z 1, which may be the same or different, wherein when n 2 represents 2, the ring/>Z 2, which may be the same or different, may be the same or different; and
N N1 represents 0, 1, 2 or 3, n N2 represents 0 or 1, and 0.ltoreq.n N1+nN2.ltoreq.3, wherein when n N1 =2 or 3, the ringZ N1, which may be the same or different, may be the same or different.
In some embodiments of the invention, L 1 and L 2 each independently represent-F, -Cl, -CF 3 or-OCF 3.
In some embodiments of the invention, the compound of formula I is selected from the group consisting of:
And
In some embodiments of the invention, Z 1 and Z 2 each independently represent a single bond, -CO-O-, -O-CO-, -CH 2O-、-OCH2 -, -CH=CH-, -C≡C-or-CH 2CH2 -; preferably, Z 1 and Z 2 each independently represent a single bond, -CH 2O-、-OCH2 -, or-CH 2CH2 -.
In some embodiments of the invention, the liquid crystal composition comprises at least two (e.g., two, three) compounds of formula I.
In some embodiments of the invention, the compounds of formula I comprise 0.1% to 40%, for example ,0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％ or 40%, by weight of the liquid crystal composition; preferably, the compound of formula I comprises 1% to 35% by weight of the liquid crystal composition.
In some embodiments of the invention, preferably, R 1 and R 2 each independently represent a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; further preferably, R 1 and R 2 each independently represent a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; still further preferably, R 1 and R 2 each independently represent a linear or branched alkyl group containing 1 to 5 carbon atoms, a linear or branched alkoxy group containing 1 to 4 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms.
The alkenyl group in the present invention is preferably selected from the group represented by any one of the formulas (V1) to (V9), and particularly preferably is a group represented by the formula (V1), the formula (V2), the formula (V8) or the formula (V9). The groups represented by the formulas (V1) to (V9) are as follows:
wherein represents a carbon atom in the bonded ring structure.
The alkenyloxy group in the present invention is preferably selected from the group represented by any one of the formulae (OV 1) to (OV 9), and particularly preferably a group represented by the formula (OV 1), formula (OV 2), formula (OV 8) or formula (OV 9). The groups represented by the formulas (OV 1) to (OV 9) are as follows:
wherein represents a carbon atom in the bonded ring structure.
In some embodiments of the invention, R 1 represents a linear or branched alkyl group containing 1 to 5 carbon atoms and R 2 represents a linear or branched alkoxy group containing 1 to 4 carbon atoms.
In some embodiments of the invention, the compound of formula N is selected from the group consisting of:
And
Wherein,
Ring(s)Representation/> And
Z N1 and Z N2 each independently represent-CO-O-; -O-CO- -CH 2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2 O-or-OCF 2 -.
In some embodiments of the present invention, the compound of formula N is selected from the group consisting of a compound of formula N-2, a compound of formula N-3, a compound of formula N-4, a compound of formula N-5, and a compound of formula N-6.
In some embodiments of the present invention, the liquid crystal composition comprises at least one compound selected from the group consisting of a compound of formula N-2, a compound of formula N-4, and a compound of formula N-6.
In some embodiments of the present invention, the liquid crystal composition comprises at least one compound selected from the group consisting of a compound of formula N-3 and a compound of formula N-5.
In some embodiments of the invention, preferably, the compound of formula N is selected from the group consisting of:
And
In some embodiments of the invention, the compound of formula N comprises 0.1% to 80%, for example ,0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％、40％、42％、44％、46％、48％、50％、52％、54％、56％、58％、60％、62％、64％、66％、68％、70％、72％、74％、76％、78％ or 80%, by weight of the liquid crystal composition; preferably, the compound of formula N comprises 5% to 80% by weight of the liquid crystal composition.
In some embodiments of the present invention, when it is desired to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferable that the lower limit value and the upper limit value of the content of the compound of the general formula N be low; further, when it is desired to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability is good, it is preferable that the lower limit value and the upper limit value of the content of the compound of the general formula N are low; in order to keep the drive voltage low and to increase the absolute value of the dielectric anisotropy, it is preferable to increase the lower limit value and the upper limit value of the content of the compound of the formula N.
In some embodiments of the invention, preferably, R N1 and R N2 each independently represent a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; further preferably, R N1 and R N2 each independently represent a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; still further preferably, R N1 and R N2 each independently represent a linear or branched alkyl group containing 1 to 5 carbon atoms, a linear or branched alkoxy group containing 1 to 4 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms.
In the present invention, the synergistic effect of the compound of formula I and the compound of formula N gives the liquid crystal composition of the present invention a better optical anisotropy, a higher clearing point, a lower rotational viscosity, a shorter response time and a steepness factor value closer to 1.
In some embodiments of the invention, the liquid crystal composition of the invention further comprises at least one compound of formula M:
Wherein,
R M1 and R M2 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, One or non-adjacent two or more-CH 2 -of the straight-chain or branched-chain alkyl groups containing 1 to 12 carbon atoms may be each independently replaced by-ch=ch-, -c≡c-, -O-, -CO-O-or-O-CO-;
Ring(s) Ring/>And Ring/>Each independently represents/> Wherein/>Wherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>At most one-H of (c) may be substituted by halogen;
Z M1 and Z M2 each independently represent a single bond, -CO-O-, -O-CO-, -CH 2O-、-OCH2-、-C≡C-、-CH＝CH-、-CH2CH2 -, or- (CH 2)4 -; and
N M represents 0, 1 or 2, wherein when n M =2, the ringZ M2, which may be the same or different, may be the same or different.
In some embodiments of the invention, the compound of formula M is selected from the group consisting of:
/>
/>
In some embodiments of the invention, the compound of formula M comprises 0.1% to 60%, for example ,0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％、40％、42％、44％、46％、48％、50％、52％、54％、56％、58％ or 60%, by weight of the liquid crystal composition; preferably, the compound of formula M comprises 5% to 60% by weight of the liquid crystal composition.
In some embodiments of the present invention, the content of the compound of formula M must be appropriately adjusted depending on the desired properties of solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, drop marks, burn-in, dielectric anisotropy, and the like.
Regarding the content of the compound of the general formula M, when it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferable that the lower limit value and the upper limit value thereof be high; further, when it is necessary to keep the clear point of the liquid crystal composition of the present invention high and the temperature stability is good, it is preferable that the lower limit value is high and the upper limit value is high; in order to keep the drive voltage low and to make the absolute value of the dielectric anisotropy large, it is preferable to make the lower limit value low and the upper limit value low.
In some embodiments of the invention, R M1 and R M2 are each preferably independently a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; r M1 and R M2 are further preferably each independently a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; r M1 and R M2 are each, even more preferably, independently of one another, a linear or branched alkyl radical having from 1 to 5 carbon atoms, a linear or branched alkoxy radical having from 1 to 4 carbon atoms or a linear or branched alkenyl radical having from 2 to 5 carbon atoms.
In some embodiments of the invention, R M1 and R M2 are preferably each independently a straight chain alkenyl group containing 2 to 8 carbon atoms; further preferred are straight chain alkenyl groups containing 2 to 5 carbon atoms each independently.
In some embodiments of the invention, preferably, either of R M1 and R M2 is a straight chain alkenyl group containing 2 to 5 carbon atoms, while the other is a straight chain alkyl group containing 1 to 5 carbon atoms.
In some embodiments of the invention, R M1 and R M2 are preferably each independently a linear alkyl group containing 1 to 8 carbon atoms, or a linear alkoxy group containing 1 to 7 carbon atoms; further preferred are straight-chain alkyl groups having 1 to 5 carbon atoms or straight-chain alkoxy groups having 1 to 4 carbon atoms, each independently.
In some embodiments of the invention, preferably, either one of R M1 and R M2 is a linear alkyl group containing 1 to 5 carbon atoms, and the other is a linear alkyl group containing 1 to 5 carbon atoms, or a linear alkoxy group containing 1 to 4 carbon atoms; further preferably, both R M1 and R M2 are independently straight chain alkyl groups containing 1 to 5 carbon atoms.
In some embodiments of the invention, where reliability is important, it is preferred that both R M1 and R M2 are alkyl; where importance is attached to reducing the volatility of the compound, it is preferable that both R M1 and R M2 are alkoxy groups; in the case where the viscosity reduction is important, at least one of R M1 and R M2 is preferably an alkenyl group.
In some embodiments of the invention, the liquid crystal composition further comprises at least one compound of formula III:
Wherein,
R 3 and R 4 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, One or non-adjacent two or more-CH 2 -of the straight-chain or branched-chain alkyl groups containing 1 to 12 carbon atoms may be each independently replaced by-ch=ch-, -c≡c-, -O-, -CO-O-or-O-CO-;
Ring(s) And Ring/>Each independently represents/>Wherein the method comprises the steps ofWherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>Wherein-H may be independently replaced by-F, -Cl or-CN, and-ch=in one or more rings may be independently replaced by-n=;
X represents-CN, halogen, halogenated or unhalogenated linear or branched alkyl having 1 to 5 carbon atoms, or halogenated or unhalogenated linear or branched alkoxy having 1 to 4 carbon atoms;
Z 3 and Z 4 each independently represent a single bond 、-CO-O-、-O-CO-、-CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2CF2-、-(CH2)4-、-CF2O- or-OCF 2 -; and
N 3 represents 0, 1, 2 or 3, n 4 represents 0 or 1, and 0.ltoreq.n 3+n4.ltoreq.3, wherein when n 3 =2 or 3, the ringZ 3, which may be the same or different, may be the same or different.
In some embodiments of the invention, the compound of formula III is selected from the group consisting of:
/>
And
Wherein,
Z 3' represents a single bond 、-CO-O-、-O-CO-、-CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2CF2-、
- (CH 2)4-、-CF2 O-or-OCF 2 -.
In some embodiments of the invention, X represents-CN.
In some embodiments of the invention, Z 3 and Z 4 each represent a single bond.
In some embodiments of the invention, the compound of formula III comprises 0% to 40%, for example ,0％、0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％ or 40% by weight of the liquid crystal composition.
In some embodiments of the invention, R 3 and R 4 are each preferably independently a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; r 3 and R 4 are further preferably each independently a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; r 3 and R 4 are each, even more preferably, independently of one another, a linear or branched alkyl radical having from 1 to 5 carbon atoms, a linear or branched alkoxy radical having from 1 to 4 carbon atoms or a linear or branched alkenyl radical having from 2 to 5 carbon atoms.
In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound selected from the group consisting of compounds of formula A-1, compounds of formula A-2, and combinations thereof:
Wherein,
R A1 and R A2 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, One or not adjacent two or more of the-CH 2 -groups of the straight-chain or branched-chain alkyl groups having 1 to 12 carbon atoms may be replaced by-CH=CH-, -C≡C-, -O-, -CO-O-or-O-CO-, respectively, and the straight-chain or branched-chain alkyl groups having 1 to 12 carbon atoms,/>Wherein one or more of-H's may each be independently substituted with-F or-Cl;
Ring(s) Ring/>Ring/>And Ring/>Each independently representsWherein/> Wherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>Wherein-H may be independently replaced by-F, -Cl or-CN, and-ch=in one or more rings may be independently replaced by-n=;
Z A11、ZA21 and Z A22 each independently represent a single bond 、-CH2CH2-、-CF2CF2-、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH2O- or-OCH 2 -;
L A11、LA12、LA13、LA21 and L A22 each independently represent-H, an alkyl group having 1 to 3 carbon atoms, or halogen;
X A1 and X A2 each independently represent halogen, haloalkyl or haloalkoxy having 1 to 5 carbon atoms, haloalkenyl or haloalkenoxy having 2 to 5 carbon atoms;
n A11 represents 0, 1,2 or 3, wherein when n A11 =2 or 3, the ring Z A11, which may be the same or different, may be the same or different;
n A12 represents 1 or 2, wherein when n A12 =2, the ring May be the same or different; and
N A2 represents 0, 1,2 or 3, wherein when n A2 =2 or 3, the ringZ A21, which may be the same or different, may be the same or different.
In some embodiments of the present invention, the compound selected from the group consisting of the compound of formula A-1, the compound of formula A-2, and combinations thereof comprises from 0% to 60%, such as ,0％、0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％、40％、42％、44％、46％、48％、50％、52％、54％、56％、58％ or 60%, by weight of the liquid crystal composition.
In some embodiments of the invention, the compound of formula a-1 is selected from the group consisting of:
/>
/>
And
Wherein,
R A1 represents a linear or branched alkyl group having 1 to 8 carbon atoms, one or not adjacent two or more of the linear or branched alkyl groups having 1 to 8 carbon atoms-CH 2 -may each be independently replaced by-CH=CH-, -C≡C-, -O-, -CO-O-or-O-CO-, and one or more of the-H groups present in these groups may each independently be substituted by-F or-Cl;
R v and R w each independently represent-CH 2 -or-O-;
L A11、LA12、LA11'、LA12'、LA14、LA15 and L A16 each independently represent-H or-F;
l A13 and L A13' each independently represent-H or-CH 3;
X A1 represents-F, -CF 3 or-OCF 3; and
V and w each independently represent 0 or 1.
In some embodiments of the invention, the compound of formula A-1 comprises 0% to 50%, such as ,0％、0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％、40％、42％、44％、46％、48％ or 50% by weight of the liquid crystal composition.
In the case where the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is high, the preferable content of the compound of the general formula a-1 is preferably set to a low lower limit and the upper limit thereof is set to a low upper limit; further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; in order to keep the drive voltage low and to increase the absolute value of the dielectric anisotropy, it is preferable to have a slightly higher lower limit value and a slightly higher upper limit value.
In some embodiments of the invention, the compound of formula a-2 is selected from the group consisting of:
/>
/>
Wherein,
R A2 represents a linear or branched alkyl group having 1 to 8 carbon atoms, one or not adjacent two or more of the linear or branched alkyl groups having 1 to 8 carbon atoms-CH 2 -may each be independently replaced by-CH=CH-, -C≡C-, -O-, -CO-O-or-O-CO-, and one or more of the-H groups present in these groups may each independently be substituted by-F or-Cl;
L A21、LA22、LA23、LA24 and L A25 each independently represent-H or-F; and
X A2 represents-F, -CF 3、-OCF3 or-CH 2CH2CH＝CF2.
In some embodiments of the invention, the compound of formula A-2 comprises 0% to 50%, such as ,0％、0.1％、1％、2％、4％、6％、8％、10％、11％、12％、13％、14％、15％、16％、17％、18％、20％、22％、24％、25％、26％、28％、30％、32％、34％、35％、36％、38％、40％、42％、44％、46％、48％ or 50% by weight of the liquid crystal composition.
In the case where the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is high, the preferable content of the compound of the general formula a-2 is preferably set to a low value and the upper value is set to a low value; further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; in order to keep the drive voltage low and to increase the absolute value of the dielectric anisotropy, it is preferable to have a slightly higher lower limit value and a slightly higher upper limit value.
In some embodiments of the invention, the liquid crystal composition of the invention further comprises at least one compound of formula B:
Wherein,
R B1 and R B2 each independently represent-H, halogen, straight-chain or branched alkyl having 1 to 12 carbon atoms, wherein one or more of the linear or branched alkyl groups having 1 to 12 carbon atoms, -CH 2 -, may be independently replaced by-CH=CH-, each in such a manner that-O-is not directly linked-C.ident.C-, -O-, -S-, -CO-O-, -O-CO-, Alternatively, and one or more of the foregoing groups-H may each independently be substituted with-F or-Cl;
Ring(s) And Ring/>Each independently represents/> Wherein/>Wherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>Wherein-H may be independently replaced by-F, -Cl, -CN, -CH 3, or-OCH 3, and-ch=may be independently replaced by-n=in one or more rings;
x B represents-O-; -S-, -CO-, -CF 2 -, -NH-, or-NF-;
Y B1 and Y B2 each independently represent-H, halogen, halogenated or non-halogenated alkyl groups having 1 to 3 carbon atoms, or halogenated or non-halogenated alkoxy groups having 1 to 3 carbon atoms;
Z B1 and Z B2 each independently represent a single bond 、-O-、-S-、-CO-O-、-O-CO-、-CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2CF2-、-(CH2)4-、-CF2O- or-OCF 2 -; and
N B1 and n B2 each independently represent 0,1 or 2, wherein when n B1 =2, the ringZ B1, which may be the same or different, wherein when n B2 =2, the ring/>Z B2, which may be the same or different, may be the same or different.
In some embodiments of the invention, the compound of formula B is selected from the group consisting of:
/>
Wherein,
Y B3 and Y B4 each independently represent-H, -F-Cl, -CN, -CH 3, or-OCH 3; and
Z B1' represents-O-; -S-, -CO-O-, -O-CO-, -CH 2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2 -, and,
-CF 2CF2-、-(CH2)4-、-CF2 O-or-OCF 2 -.
In some embodiments of the invention, the compound of formula B comprises 0% to 30% by weight of the liquid crystal composition, e.g., 0%, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 25%, 26%, 28% or 30%.
In some embodiments of the invention, preferably, R B1 and R B2 each independently represent a linear or branched alkyl group containing 1 to 10 carbon atoms, a linear or branched alkoxy group containing 1 to 9 carbon atoms, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; further preferably, R B1 and R B2 each independently represent a linear or branched alkyl group having 1 to 8 carbon atoms, a linear or branched alkoxy group having 1 to 7 carbon atoms, or a linear or branched alkenyl group having 2 to 8 carbon atoms; still further preferably, R B1 and R B2 each independently represent a linear or branched alkyl group containing 1 to 5 carbon atoms, a linear or branched alkoxy group containing 1 to 4 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms.
In addition to the above-mentioned compounds, the liquid crystal composition of the present invention may contain a usual nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, dopant, antioxidant, ultraviolet absorber, infrared absorber, polymerizable monomer, light stabilizer, or the like.
Possible dopants preferably added to the liquid crystal composition according to the invention are shown below:
And
In some embodiments of the invention, the dopant comprises 0% to 5% by weight of the liquid crystal composition; preferably, the dopant comprises 0.01% to 1% by weight of the liquid crystal composition.
The additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following:
/>
/>
Wherein n represents a positive integer of 1 to 12.
Preferably, the light stabilizer is selected from the group consisting of the light stabilizers shown below:
In some embodiments of the invention, the light stabilizer comprises 0% to 5% by weight of the total weight of the liquid crystal composition; preferably, the light stabilizer comprises 0.01% -1% of the total weight of the liquid crystal composition; more preferably, the light stabilizer comprises 0.01% to 0.1% by weight of the total weight of the liquid crystal composition.
In still another aspect, the present invention also provides a liquid crystal display device comprising the above liquid crystal composition.
The beneficial effects are that: compared with the prior art, the liquid crystal composition has better optical anisotropy, higher clearing point, lower rotational viscosity, shorter response time and steeper factor value which is closer to 1 under the condition of maintaining proper absolute value of dielectric anisotropy, so that a liquid crystal display device comprising the liquid crystal composition has better contrast ratio, wider usable temperature range, quicker response speed, steeper electro-optical curve, stronger multiplex addressing capability and larger information display quantity.
Detailed Description
The invention will be described below in connection with specific embodiments. The following examples are illustrative of the present invention and are not intended to limit the present invention. Other combinations and various modifications within the spirit of the invention may be made without departing from the spirit or scope of the invention.
For ease of expression, in each of the following examples, the group structure of each compound is represented by the code listed in Table 1:
TABLE 1 group Structure codes for Compounds
/>
Take as an example a compound of the formula:
The structural formula is expressed by codes listed in table 1, and can be expressed as follows: nCCGF, n in the code represents the number of C atoms of the left-end alkyl group, for example, n is "3", i.e., represents that the alkyl group is-C 3H7; c in the code represents 1, 4-cyclohexylene, G represents 2-fluoro-1, 4-phenylene and F represents fluorine.
The shorthand designations for the test items in the following examples are as follows:
Cp clearing point (nematic phase-isotropic phase transition temperature, DEG C)
Delta n optical anisotropy (589 nm,25 ℃ C.)
Delta epsilon dielectric anisotropy (1 KHz,25 ℃ C.)
Gamma 1 rotational viscosity (mPa.s, 25 ℃ C.)
V th threshold voltage (V, characteristic voltage with relative contrast of 10% in normally white mode)
V sat saturation voltage (V, characteristic voltage with relative contrast of 90% in normally white mode)
P steepness factor (P=V sat/Vth, steepness of liquid crystal electro-optic curve)
When τ off is powered off, the time required for the transmittance to drop from 90% to 10% (ms, 25 ℃ C.)
Wherein,
Cp: obtained by a melting point tester test.
An: the product was obtained by testing at 25℃under a sodium light (589 nm) source using an Abbe refractometer.
Δε: Δ∈=ε ∥-ε⊥, where ε ∥ is the dielectric constant parallel to the molecular axis and ε ⊥ is the dielectric constant perpendicular to the molecular axis; test conditions: VA type test box with 25 deg.C, 1KHz and box thickness of 6 μm.
Gamma 1: the liquid crystal display is obtained by testing by using an LCM-2 liquid crystal physical property evaluation system; test conditions: the temperature is 25 ℃, the voltage is 160-260V, and the thickness of the test box is 20 mu m.
V th: test using DMS 505 tester, test conditions: IPS liquid crystal box, box thickness 4 μm, test frequency 60Hz, test waveform square.
V sat: test using DMS 505 tester, test conditions: IPS liquid crystal box, box thickness 4 μm, test frequency 60Hz, test waveform square.
Τ off: the test is carried out by using a DMS 505 liquid crystal display screen optical measurement system, and the test conditions are as follows: TN type test cell with cell thickness of 7.0 μm at 25deg.C.
The components used in the examples below may be synthesized by known methods or commercially available. These synthetic techniques are conventional and the resulting liquid crystal compounds have been tested to meet the electronic class of compound standards.
Liquid crystal compositions were prepared in accordance with the proportions of the respective liquid crystal compositions specified in the following examples. The liquid crystal composition is prepared by mixing the components in proportion by a conventional method in the art, such as heating, ultrasonic wave, suspending and the like.
Comparative example 1
The liquid crystal composition of comparative example 1 was prepared according to each of the compounds listed in table 2 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 2 formulation of liquid Crystal composition and results of Performance parameter test
Example 1
The liquid crystal composition of example 1 was prepared according to the respective compounds listed in table 3 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 3 formulation of liquid Crystal composition and results of Performance parameter test
From a comparison of comparative example 1 and example 1, it is understood that the liquid crystal composition of the present invention has higher optical anisotropy, higher clearing point, shorter response time and a steepness factor value closer to 1 while maintaining an appropriate absolute value of dielectric anisotropy and an appropriate rotational viscosity.
Comparative example 2
The liquid crystal composition of comparative example 2 was prepared according to each of the compounds listed in table 4 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 4 formulation of liquid Crystal composition and results of Performance parameter test
Example 2
The liquid crystal composition of example 2 was prepared according to the respective compounds listed in table 5 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 5 formulation of liquid Crystal composition and results of Performance parameter test
From a comparison of comparative example 2 and example 2, it is understood that the liquid crystal composition of the present invention has a lower rotational viscosity, a shorter response time and a steepness factor value closer to 1 while maintaining an appropriate absolute value of dielectric anisotropy, an appropriate optical anisotropy and an appropriate clearing point.
Example 3
The liquid crystal composition of example 3 was prepared according to each of the compounds listed in table 6 and its weight percentage, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 6 formulation of liquid Crystal composition and results of Performance parameter test
Example 4
The liquid crystal composition of example 4 was prepared according to the respective compounds listed in table 7 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 7 formulation of liquid Crystal composition and results of Performance parameter test
Example 5
The liquid crystal composition of example 5 was prepared according to the respective compounds listed in table 8 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 8 formulation of liquid Crystal composition and results of Performance parameter test
Example 6
The liquid crystal composition of example 6 was formulated as each of the compounds listed in table 9 and its weight percent, and was filled between two substrates of a liquid crystal display for performance testing.
TABLE 9 formulation of liquid Crystal composition and results of Performance parameter test
Example 7
The liquid crystal composition of example 7 was prepared according to the respective compounds listed in table 10 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 10 formulation of liquid Crystal composition and results of Performance parameter test
/>
Example 8
The liquid crystal composition of example 8 was formulated as each of the compounds listed in table 11 and its weight percent, and was filled between two substrates of a liquid crystal display for performance testing.
TABLE 11 formulation of liquid Crystal composition and results of Performance parameter test
/>
Example 9
The liquid crystal composition of example 9 was prepared according to the respective compounds listed in table 12 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 12 formulation of liquid Crystal composition and results of Performance parameter tests
Example 10
The liquid crystal composition of example 10 was formulated according to the respective compounds listed in table 13 and their weight percentages, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 13 formulation of liquid Crystal composition and results of Performance parameter test
/>
Example 11
The liquid crystal composition of example 11 was prepared according to the respective compounds listed in table 14 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 14 formulation of liquid Crystal composition and results of Performance parameter test
Example 12
The liquid crystal composition of example 12 was prepared according to the respective compounds listed in table 15 and weight percentages thereof, and was filled between two substrates of a liquid crystal display for performance test.
TABLE 15 formulation of liquid Crystal composition and results of Performance parameter test
In summary, the liquid crystal composition of the invention has better optical anisotropy, higher clearing point, lower rotational viscosity, shorter response time and steeper factor value approaching 1 under the condition of maintaining proper absolute value of dielectric anisotropy, so that the liquid crystal display device comprising the liquid crystal composition has better contrast ratio, wider usable temperature range, faster response speed, steeper electro-optic curve, stronger multiplex addressing capability and larger information display amount.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement it, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (4)
1. A liquid crystal composition, characterized in that the liquid crystal composition comprises:
at least two compounds of formula I selected from the group consisting of:
and at least one compound of formula N selected from the group consisting of:
And
At least one compound of the formula M selected from the group consisting of:
And
Wherein,
R 1 and R 2 each independently represent a linear or branched alkyl group containing 1 to 12 carbon atoms, one or two or more non-adjacent-CH 2 -groups in the linear or branched alkyl group containing 1 to 12 carbon atoms can be replaced by-O-groups independently;
R N1 and R N2 each independently represent a linear or branched alkyl group containing 1 to 12 carbon atoms, one or two or more non-adjacent-CH 2 -groups in the linear or branched alkyl group containing 1 to 12 carbon atoms can be replaced by-O-groups independently;
Ring(s) And Ring/>Each independently represents/>Wherein/>Wherein one or more of-H's may each be independently substituted with-F or-CN;
Z 1 and Z 2 each independently represent a single bond, -CH 2 O-, or-OCH 2 -;
Z N1 represents-CO-O-; -O-CO- -CH 2O-、-OCH2 -, -c≡c-, or-CH 2CH2 -;
l N1 and L N2 each independently represent-CN, or halogen;
R M1 and R M2 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, one or two or more non-adjacent-CH 2 -groups of the linear or branched alkyl groups having 1 to 12 carbon atoms may be each independently substituted
-Ch=ch-substitution; and
The weight percentage of the compound of the general formula I in the liquid crystal composition is 0.1-40%; the compound of the general formula N accounts for 30-80% of the weight of the liquid crystal composition; the weight percentage of the compound of the general formula M in the liquid crystal composition is 10-60%.
2. The liquid crystal composition according to claim 1, further comprising at least one compound of formula III:
Wherein,
R 3 and R 4 each independently represent a linear or branched alkyl group having 1 to 12 carbon atoms, One or non-adjacent two or more-CH 2 -of the straight-chain or branched-chain alkyl groups containing 1 to 12 carbon atoms may be each independently replaced by-ch=ch-, -c≡c-, -O-, -CO-O-or-O-CO-;
Ring(s) And Ring/>Each independently represents/>Wherein/>Wherein-CH 2 -may each independently be replaced by-O-and the single bond in one or more rings may each independently be replaced by a double bond, wherein/>Wherein-H may be independently replaced by-F, -Cl or-CN, and-ch=in one or more rings may be independently replaced by-n=;
X represents-CN, halogen, halogenated or unhalogenated linear or branched alkyl having 1 to 5 carbon atoms, or halogenated or unhalogenated linear or branched alkoxy having 1 to 4 carbon atoms;
Z 3 and Z 4 each independently represent a single bond 、-CO-O-、-O-CO-、-CH2O-、-OCH2-、-CH＝CH-、-C≡C-、-CH2CH2-、-CF2CF2-、-(CH2)4-、-CF2O- or-OCF 2 -; and
N 3 represents 0, 1, 2 or 3, n 4 represents 0 or 1, and 0.ltoreq.n 3+n4.ltoreq.3, wherein when n 3 =2 or 3, the ringZ 3, which may be the same or different, may be the same or different.
3. The liquid crystal composition according to claim 1, wherein the liquid crystal composition comprises at least one compound selected from the group consisting of a compound of formula N-2, a compound of formula N-4, and a compound of formula N-6.
4. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 3.
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