CN105131975B - A kind of positive and negative mixed liquid crystal composition - Google Patents
A kind of positive and negative mixed liquid crystal composition Download PDFInfo
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- CN105131975B CN105131975B CN201510555508.2A CN201510555508A CN105131975B CN 105131975 B CN105131975 B CN 105131975B CN 201510555508 A CN201510555508 A CN 201510555508A CN 105131975 B CN105131975 B CN 105131975B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 105
- 239000000203 mixture Substances 0.000 title claims abstract description 66
- 150000001875 compounds Chemical group 0.000 claims abstract description 62
- 125000004432 carbon atom Chemical group C* 0.000 claims description 27
- 125000000217 alkyl group Chemical group 0.000 claims description 15
- 125000003342 alkenyl group Chemical group 0.000 claims description 13
- 125000003545 alkoxy group Chemical group 0.000 claims description 12
- 125000001140 1,4-phenylene group Chemical group [H]C1=C([H])C([*:2])=C([H])C([H])=C1[*:1] 0.000 claims description 3
- 125000005407 trans-1,4-cyclohexylene group Chemical group [H]C1([H])C([H])([H])[C@]([H])([*:2])C([H])([H])C([H])([H])[C@@]1([H])[*:1] 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000012963 UV stabilizer Substances 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000003963 antioxidant agent Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000002019 doping agent Substances 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 20
- 230000004044 response Effects 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 22
- 239000013078 crystal Substances 0.000 description 11
- 206010047571 Visual impairment Diseases 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 210000002858 crystal cell Anatomy 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- HGCIXCUEYOPUTN-UHFFFAOYSA-N C1CC=CCC1 Chemical compound C1CC=CCC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 description 1
- DHXVGJBLRPWPCS-UHFFFAOYSA-N C1CCOCC1 Chemical compound C1CCOCC1 DHXVGJBLRPWPCS-UHFFFAOYSA-N 0.000 description 1
- VDFVNEFVBPFDSB-UHFFFAOYSA-N C1COCOC1 Chemical compound C1COCOC1 VDFVNEFVBPFDSB-UHFFFAOYSA-N 0.000 description 1
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 description 1
- PYLWMHQQBFSUBP-UHFFFAOYSA-N Fc1ccccc1 Chemical compound Fc1ccccc1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004720 dielectrophoresis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- 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
- C09K19/0403—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit the structure containing one or more specific, optionally substituted ring or ring systems
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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
- C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
- C09K2019/0466—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the linking chain being a -CF2O- chain
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Abstract
The invention discloses a kind of positive and negative mixed liquid crystal composition, it is characterised in that comprising the negativity compound group shown at least one formula I into component A, include shown in one or more formulas II positive compounds composition component B.The characteristics of liquid-crystal composition disclosed in this invention has positive dielectric, high electric charge conservation rate, and low rotary viscosity, response time are fast, and especially transmitance is high, suitable for manufacture high transmittance, the TFT LCD of quick response.
Description
Technical Field
The invention belongs to the technical field of liquid crystal materials, and particularly relates to a positive-negative mixed liquid crystal composition and application thereof in a liquid crystal display.
Background
Display is a process of converting an electrical signal (data information) into visible light (visual information), and a Man-Machine Interface (MMI) is a device for completing display. Flat Panel Displays (FPDs) are the most popular type of Display device at present. A Liquid Crystal Display (LCD) is the earliest developed and commercialized product among FPDs. Currently, Thin Film Transistor liquid crystal displays (TFT-LCDs) have become the mainstream product in LCD applications.
In terms of the operating principle, the LCD device displays an image recognizable by a user by generating light and shade (and thus color change) corresponding to the image to be displayed from light emitted from a backlight source through a polarizer, a liquid crystal cell (liquid crystal molecules), and the like. That is, the brightness of the LCD depends on various factors such as the relative amount of light passing through the liquid crystal cell (referred to as the transmittance of the liquid crystal cell), the relative amount of light passing through the color filter (the transmittance of the CF), and the brightness of the backlight.
The introduction of different display modes has led to a significant improvement in the performance of Liquid Crystal Displays (LCDs), and the LCDs are more widely used in different fields such as smart phones, displays, portable tablet computers, televisions, and the like. These applications place higher display requirements on liquid crystal displays, such as high contrast, wide viewing angle, fast response and high transmittance. Among them, in the case of ultra-high resolution, the aperture ratio is reduced due to the reduction in pixel size, so that a high transmittance display is important.
The dielectric properties of the liquid crystal are expressed by a dielectric constant. The electric field dielectric constant parallel to the liquid crystal director is expressed by/and the electric field dielectric constant perpendicular to the liquid crystal director is expressed by ×, and the dielectric anisotropy constant is Δ ═/. If the direction of the permanent dipole moment of the polar group of the liquid crystal molecule coincides with the direction of the long axis of the molecule, the degree of electron shift in the direction of the long axis of the liquid crystal molecule is the largest, and thus, the dipole moment in the direction parallel to the long axis of the molecule is large, the dielectric anisotropy is positive, Δ > 0, and such a liquid crystal is called a positive liquid crystal. If the direction of the permanent dipole moment of the polar group of the liquid crystal molecule is perpendicular to the direction of the long axis of the molecule, the degree of electron shift in the direction of the short axis of the liquid crystal molecule is the largest, and thus, a liquid crystal having a small dipole moment in the direction perpendicular to the long axis of the molecule and a negative dielectric anisotropy, Δ < 0, is called a negative liquid crystal.
Currently, in the liquid crystal display market, the display modes with competitiveness mainly include in-plane switching (IPS), fringe-field switching (FFS), and Vertical Alignment (VA). In these display modes, in-plane switching (IPS) and Fringe Field Switching (FFS) are both characterized by a wide viewing angle.
When the positive liquid crystal is used in an IPS/FFS display mode, a fast response can be obtained and good reliability is obtained; while a negative liquid crystal can obtain a higher transmittance when used in an IPS/FFS display mode, the negative liquid crystal has a relatively high viscosity and therefore has a relatively slow response time. Therefore, Hybrid liquid crystal with negative components added in the traditional positive liquid crystal mixture is produced, so that the Hybrid liquid crystal has the advantage of quick response of the positive liquid crystal, and meanwhile, the penetration rate can be effectively improved, and the overall power consumption of the liquid crystal display device can be greatly reduced.
In the case of a liquid crystal display device, when a display screen is changed after a long-time fixed screen display, the previous screen cannot disappear immediately, and the display effect is seriously affected by a so-called afterimage phenomenon. With the continuous expansion and application of liquid crystal display in the field of vehicle-mounted industrial control, requirements are made on the normal use of liquid crystal materials in a temperature range which is as wide as possible and takes room temperature as a center, so that the liquid crystal composition is required to have high clearing point and excellent intersolubility at low temperature, and further to be capable of keeping nematic phase in the temperature range which is as wide as possible and eliminating the afterimage phenomenon as far as possible.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid crystal composition, which is a Hybrid liquid crystal composition with excellent intersolubility and composed of dielectric positive and negative polarity liquid crystal compounds with stable structures, so as to improve the transmittance, improve the afterimage phenomenon, maintain the nematic phase in the widest temperature range with room temperature as the center, and realize excellent display effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a positive-negative mixed liquid crystal composition comprises a component A consisting of one or more negative compounds represented by a general formula I, a component B consisting of one or more positive compounds represented by a general formula II,
wherein,
R1is selected fromAny one of a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms;
R2any one selected from linear alkyl groups with 1-5 carbon atoms;
(O) is selected from any one of-O-or a single bond;
R3is selected fromAny one of a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms;
X1、X2、X3each independently selected from H,Any one of F, and X1、X2、X3At least one of which is F;
Y1、Y2each independently selected from H, CH3And Y is any one of1、Y2At least one of them is CH3；
Z1Selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
to representAny one of the above;
to representAny one of the above;
to representAny one of the above;
a. b each independently represents 1 or 2, and when a ═ 2,which may be the same or different, when b is 2,may be the same or different.
The technical scheme of the invention is further improved as follows: the liquid crystal composition also comprises a component C consisting of one or more compounds shown in a general formula III and one or more compounds shown in a general formula IV and/or a general formula V;
wherein,
R4、R5、R6、R7、R8each independently selected from any one of a C1-10 linear alkyl group, a C1-10 linear alkoxy group or a C2-10 linear alkenyl group;
X4、X5each independently selected from H, F;
Y3any one of F, straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy with 1-6 carbon atoms or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F;
Z2selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
any one or more of ① and ②,
① trans 1, 4-cyclohexylene, 1, 4-cyclohexenyl radicals in which one or more non-adjacent-CH groups2-the group is substituted or unsubstituted by-O-or-S-;
(ii) a 1, 4-phenylene group in which one or two-CH-groups are substituted or unsubstituted by N and one or two H groups are substituted or unsubstituted by F;
c. d and e each independently represent 0 or 1.
The technical scheme of the invention is further improved as follows: in the liquid crystal composition, the weight percentage of the component A is 1-20%, and the weight percentage of the component B is 10-70%.
The technical scheme of the invention is further improved as follows: in the liquid crystal composition, the weight percentage of the component C is 20-70%.
The technical scheme of the invention is further improved as follows: the negative compound shown in the general formula I is a compound shown in the following formulas I-a to I-e,
the technical scheme of the invention is further improved as follows: the compound shown in the general formula II is a compound shown in a formula II-1 to a formula II-10,
the technical scheme of the invention is further improved as follows: the compound shown in the general formula II is a compound shown in a formula II-1-1 to a formula II-10-10,
the technical scheme of the invention is further improved as follows: the compound shown in the general formula III is a compound shown in the following formulas III-a to III-d,
the technical scheme of the invention is further improved as follows: the compound shown in the general formula IV is a compound shown in the following formulas IV-a to IV-c,
the technical scheme of the invention is further improved as follows: the compound shown in the general formula V is a compound shown in the following formulas V-a to V-f,
the technical scheme of the invention is further improved as follows: the liquid crystal composition further comprises one or more additive components selected from the group consisting of UV stabilizers, dopants, antioxidants.
The liquid crystal composition disclosed by the invention can be applied to a liquid crystal display device. The method is particularly suitable for displays of IPS-TFT, FFS-TFT and OCB modes.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the liquid crystal composition provided by the invention can be added with mixed liquid crystal by adding a proper amount (1-20 wt%) of negative liquid crystal molecules into positive liquid crystal⊥Thereby improving the transmittance of the pure positive mixed crystal, and simultaneously having lower rotational viscosity, faster response time and more stable reliability than the pure negative mixed crystal.
The negative compound disclosed by the invention comprises the negative compound disclosed as the general formula I, although the compound is a negative molecule, the viscosity is relatively small due to the short chain length and few flexible groups, and the contained positive compound disclosed as the general formula II has relatively large dielectric property and can make up the dielectric reduction caused by adding negative liquid crystal, so that the problem of low transmission rate of an IPS/FFS display mode can be effectively solved by the combination of the negative compound and the positive compound. Meanwhile, the reasonable design of the molecular structure of the compound with the structure II (adding-CH on a benzene ring)3Group), which makes the liquid crystal composition very excellent in solubility at low temperatures, and further provides an extremely wide applicable temperature range in which the nematic phase is maintained at extremely low temperatures while maintaining a high clearing point. The liquid crystal composition with excellent intersolubility, which is formed by combining the dielectric positive and negative polar liquid crystal compounds with stable structures, can effectively improve the afterimage phenomenon and realize excellent display effect.
The invention can meet the liquid crystal display application in the field of vehicle-mounted industrial control, namely, the requirements are provided for the normal use of the liquid crystal material in the temperature range which is as wide as possible and takes the room temperature as the center, so that the liquid crystal composition is required to have high clearing point and excellent intersolubility at low temperature. The compound of the structural formula II is prepared by adding one or two-CH on a benzene ring at the end side3The structure can destroy the symmetry of the central skeleton of the molecule and effectively reduce the crystallinity of the molecule. And the molecules of such compoundsThe dielectric polarity is very large, the reduction of the dielectric coefficient caused by I-type negative dielectric polarity compounds can be effectively counteracted, so that the liquid crystal composition which meets the requirement of large positive dielectric is formed, meanwhile, the low-temperature intersolubility is very excellent, the nematic phase can be kept in an extremely wide temperature range taking the normal temperature as the center, and the severe application requirement of vehicle-mounted industrial control products is met.
The liquid crystal display prepared by the liquid crystal composition provided by the invention has the advantages of high contrast, wide viewing angle, quick response, high transmittance and the like.
Detailed Description
The invention relates to a positive-negative mixed liquid crystal composition, which comprises a component A consisting of one or more negative compounds shown as a general formula I, a component B consisting of one or more positive compounds shown as a general formula II,
wherein,
R1is selected fromAny one of a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms;
R2any one selected from linear alkyl groups with 1-5 carbon atoms;
(O) is selected from any one of-O-or a single bond;
R3is selected fromA linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atomsAny one of a C2-10 linear alkenyl group or a C2-10 linear alkenyl group;
X1、X2、X3each independently selected from H, F, and X1、X2、X3At least one of which is F;
Y1、Y2each independently selected from H, CH3And Y is any one of1、Y2At least one of them is CH3；
Z1Selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
to representAny one of the above;
to representAny one of the above;
to representAny one of the above;
a. b each independently represents 1 or 2, and when a ═ 2,which may be the same or different, when b is 2,may be the same or different.
In the liquid crystal composition, the weight percentage of the component A is 1-20%, and the weight percentage of the component B is 10-70%. Preferably, the weight percentage of the component A is 2-15%, and the weight percentage of the component B is 10-60%. More preferably, the weight percentage of the component A is 5-15%, and the weight percentage of the component B is 15-50%.
The liquid crystal composition can also comprise a component C consisting of one or more compounds shown in a general formula III and one or more compounds shown in a general formula IV and/or a general formula V;
wherein,
R4、R5、R6、R7、R8each independently selected from any one of a C1-10 linear alkyl group, a C1-10 linear alkoxy group or a C2-10 linear alkenyl group;
X4、X5each independently selected from H, F;
Y3any one of F, straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy with 1-6 carbon atoms or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F;
Z2selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
any one or more of ① and ②,
① trans 1, 4-cyclohexylene, 1, 4-cyclohexenyl radicals in which one or more non-adjacent-CH groups2-the group is substituted or unsubstituted by-O-or-S-;
(ii) a 1, 4-phenylene group in which one or two-CH-groups are substituted or unsubstituted by N and one or two H groups are substituted or unsubstituted by F;
c. d and e each independently represent 0 or 1.
In the liquid crystal composition, the weight percentage of the component C is 20-70%. Preferably, the weight percentage of the component C is 20-60%. More preferably, the weight percentage of the component C is 20-50%.
The liquid crystal composition of the present invention can be produced by mixing the liquid crystal compounds, for example, by mixing the different components at a high temperature and dissolving them in each other, or by other conventional methods, for example, by heating, ultrasonic wave, suspension, etc.
The percentages in the specification are mass percentages, the temperature is centigrade (DEG C), and the specific meanings and test conditions of other symbols are as follows:
cp represents a liquid crystal clearing point (DEG C), and is measured by a DSC quantitative method;
S-N represents the crystalline to nematic melting point (. degree. C.) of the liquid crystal;
Δ n represents optical anisotropy, noRefractive index of ordinary light, neThe refractive index of the extraordinary ray is measured under the conditions of 25 +/-2 ℃ and 589nm, and the Abbe refractometer is used for testing;
Δ represents dielectric anisotropy, Δ ═∥-⊥Wherein∥is the dielectric constant parallel to the molecular axis,⊥dielectric constant perpendicular to the molecular axis, at 25 + -0.5 deg.C, 20 μm parallel box, INSTEC: ALCT-IR1 test;
γ 1 represents rotational viscosity (mPa. multidot.s) at 25. + -. 0.5 ℃ in a 20 μm parallel cell INSTEC: ALCT-IR1 test;
rho represents resistivity (omega cm), the test condition is 25 +/-2 ℃, and the test instrument is a TOYO SR6517 high-impedance instrument and an LE-21 liquid electrode.
VHR represents the voltage holding ratio (%), and the test conditions are 20 +/-2 ℃, voltage +/-5V, pulse width 10ms and voltage holding time 16.7 ms. The testing equipment is a TOYO Model6254 liquid crystal performance comprehensive tester.
Tau represents response time (ms), the test instrument is DMS-501, the test condition is 25 +/-0.5 ℃, the test box is a 3.3-micrometer IPS test box, the electrode spacing and the electrode width are both 10 micrometers, and the included angle between the friction direction and the electrode is 10 degrees.
T (%) represents transmittance, T (%) is 100% bright state (Vop) luminance/light source luminance, the test device DMS501, the test conditions are 25 ± 0.5 ℃, the test cell is a 3.3 μm IPS test cell, the electrode pitch and the electrode width are both 10 μm, and the rubbing direction is 10 ° from the electrode.
The present invention will be described in further detail with reference to specific examples below:
example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Example 7
Example 8
COMPARATIVE EXAMPLE 1(D1)
COMPARATIVE EXAMPLE 2(D2)
Comparison table of performance parameter test results of examples 1 to 8 and comparative examples 1 to 2
| Examples | S-N | Cp | γ1 | Δn | Δε | Τ | ρ×1013 | VHR | T |
| 1 | ≤-40 | 85 | 73 | 0.105 | 6.0 | 35.97 | 13.6 | 99.84 | 4.2 |
| 2 | ≤-40 | 70 | 51 | 0.115 | 4.5 | 25.42 | 12.5 | 99.79 | 5.2 |
| 3 | ≤-40 | 90 | 95 | 0.124 | 8.5 | 30.76 | 13.4 | 99.76 | 5.0 |
| 4 | ≤-40 | 80 | 68 | 0.102 | 9.5 | 23.22 | 11.7 | 99.67 | 4.8 |
| 5 | ≤-40 | 70 | 45 | 0.105 | 3.3 | 23.42 | 12.5 | 99.73 | 5.4 |
| 6 | ≤-40 | 90 | 63 | 0.105 | 8.5 | 30.67 | 13.3 | 99.80 | 3.9 |
| 7 | ≤-30 | 82 | 57 | 0.122 | 8.3 | 25.42 | 11.5 | 99.70 | 4.9 |
| 8 | ≤-40 | 93 | 60 | 0.100 | 3.5 | 22.67 | 13.0 | 99.67 | 6.2 |
| D1 | ≤-40 | 85 | 71 | 0.105 | 6.5 | 34.55 | 15.2 | 99.85 | 3.7 |
| D2 | ≤-30 | 85 | 75 | 0.105 | 6.0 | 36.65 | 15.3 | 99.83 | 4.1 |
As can be seen from comparison between the embodiment 1 and the comparative example 2, after the dielectrophoresis compound of the component I is added into the embodiment 1 and the comparative example 2, the transmittance is obviously increased, and the performance in other aspects, clearing point, refractive index, response time, resistivity and voltage holding ratio are not lost, and the level is still equivalent to that of pure liquid crystal, so that the mixed crystal with quick response, high transmittance and good stability is obtained. Meanwhile, the system of the embodiment 1 has better solubility at low temperature than the system of the comparative example 2, and is beneficial to the application of the liquid crystal display device in a harsh environment with wider temperature change range, which is very necessary in the fields of vehicle-mounted, industrial control and the like.
The mixed crystal composition of example 2 has very high transmittance, high refractive index, and fast response due to the addition of a suitable amount of the class i dielectric negative liquid crystal compound, is suitable for display applications such as IPS-TV with a large cell thickness, and is beneficial to realizing the performance of wide viewing angle, high contrast, high-quality dynamic picture playing, and the like.
The mixed crystal compound of embodiment 3 has a wide temperature application range, a large refractive index, a high transmittance, a fast response, and good high and low temperature stability, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display applications such as vehicle-mounted display.
The mixed crystal compound of embodiment 4 has suitable refractive index and clearing point, high transmittance, fast response, and wide viewing angle advantage combined with IPS display mode, and is suitable for display applications such as medium and small sized Pad and mobile phone.
The mixed crystal compound of example 5 has suitable refractive index and clearing point, high transmittance, fast response, combines with the wide viewing angle advantage of the IPS display mode, and is suitable for handheld terminal display applications.
The mixed crystal compound of embodiment 6 has a wide temperature application range, a large refractive index, a high transmittance, a fast response, and good high and low temperature stability, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display applications such as vehicle-mounted display.
The mixed crystal compound of example 7 has a higher refractive index, is suitable for a display with a low cell thickness, has a higher clearing point, has a wider application temperature range, a high transmittance, a fast response, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display application of a handheld terminal device.
The mixed crystal compound of embodiment 8 has a suitable refractive index, a very high clearing point and transmittance, and a fast response, combines the wide viewing angle advantage of the IPS display mode, and is suitable for the display field with wide temperature range requirements such as vehicle-mounted industrial control.
For evaluation of compatibility at low temperature, 1g of the prepared liquid crystal composition was weighed, packaged in a 2mL sample bottle, placed in a temperature control box at-40 ℃, and the occurrence of precipitates from the liquid crystal composition was visually observed, and the test time for the occurrence of precipitates was recorded. The longer the test time, the better the low temperature compatibility of the liquid crystal composition, and the longer the nematic phase state required for display can be maintained.
And the evaluation of the afterimage is to pour the corresponding liquid crystal composition into the nine-square grid, apply the picture display of the high gray scale and low gray scale to different grids respectively, hold for 10 hours and then apply the picture display of the middle gray scale at the same time, test the retention time of the afterimage, the longer the retention time, the longer the recovery time of the afterimage, the worse the display effect.
From the above test results, it can be seen that due to the addition of the class II liquid crystal compound, the positive and negative mixed liquid crystal composition of the present invention has very excellent low temperature solubility, and no crystal precipitation phenomenon is generated after the positive and negative mixed liquid crystal composition is placed in an environment of-40 ℃ for 100 days. And the improvement effect of the afterimage is very obvious.
From examples 1 to 8, it is understood that the liquid crystal composition having positive and negative liquid crystal compounds of the present invention can obtain high transmittance and very excellent high and low temperature stability while maintaining the proper optical anisotropy, large positive dielectric, low rotational viscosity, fast response time, high Voltage Holding Ratio (VHR) and other physical properties of the genuine liquid crystal composition, and has an excellent display effect and very low afterimage effect, and can be applied to IPS-TFT, FFS-TFT and OCB mode displays.
Although the present invention only exemplifies specific materials and proportioning mass percentages of the above 8 examples, and tests the performance of the liquid crystal composition, the liquid crystal composition of the present invention can utilize the compounds represented by the general formulas I, II, III, IV and V and the preferable compounds of the general formulas I, II, III, IV and V to further develop and modify on the basis of the above examples, and can achieve the purpose of the present invention.
Claims (12)
1. A positive-negative mixed liquid crystal composition characterized by: the liquid crystal composition comprises a component A consisting of one or more negative compounds shown as a general formula I, a component B consisting of one or more positive compounds shown as a general formula II,
wherein,
R1is selected fromAny one of a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms;
R2any one selected from linear alkyl groups with 1-5 carbon atoms;
(O) is selected from any one of-O-or a single bond;
R3is selected fromAny one of a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 10 carbon atoms, or a linear alkenyl group having 2 to 10 carbon atoms;
X1、X2、X3represents F;
Y1、Y2each independently selected from H, CH3And Y is any one of1、Y2At least one of them is CH3；
Z1Selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
to representOrAny one of the above;
to representAny one of the above;
to representAny one of the above;
a. b each independently represents 1 or 2, and when a ═ 2,which may be the same or different, when b is 2,may be the same or different.
2. A positive-negative mixture liquid crystal composition according to claim 1, wherein: the liquid crystal composition also comprises a component C consisting of one or more compounds shown in a general formula III and one or more compounds shown in a general formula IV and/or a general formula V;
wherein,
R4、R5、R6、R7、R8each independently selected from any one of a C1-10 linear alkyl group, a C1-10 linear alkoxy group or a C2-10 linear alkenyl group;
X4、X5each independently selected from H, F;
Y3selected from F, carbon atomsAny one of straight-chain alkyl with the number of 1-6, straight-chain alkoxy with the number of carbon atoms of 1-6 or straight-chain alkenyl with the number of carbon atoms of 2-6, wherein H is unsubstituted, mono-substituted or poly-substituted by F;
Z2selected from single bonds, -CH2-、-CH2-CH2-、-(CH2)3-、-(CH2)4-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
any one or more of ① and ②,
① trans 1, 4-cyclohexylene, 1, 4-cyclohexenyl radicals in which one or more non-adjacent-CH groups2-the group is substituted or unsubstituted by-O-or-S-;
(ii) a 1, 4-phenylene group in which one or two-CH-groups are substituted or unsubstituted by N and one or two H groups are substituted or unsubstituted by F;
c. d and e each independently represent 0 or 1.
3. A positive-negative mixture liquid crystal composition according to claim 1, wherein: in the liquid crystal composition, the weight percentage of the component A is 1-20%, and the weight percentage of the component B is 10-70%.
4. A positive-negative mixture liquid crystal composition according to claim 2, wherein: in the liquid crystal composition, the weight percentage of the component C is 20-70%.
5. A positive-negative mixture liquid crystal composition according to claim 1, wherein: the negative compound shown in the general formula I is a compound shown in the following formulas I-a to I-e,
6. a positive-negative mixture liquid crystal composition according to claim 1, wherein: the compound shown in the general formula II is a compound shown in a formula II-1 to a formula II-10,
7. the positive-negative mixture liquid crystal composition according to claim 6, wherein: the compound shown in the general formula II is a compound shown in the specification,
8. a positive-negative mixture liquid crystal composition according to claim 2, wherein: the compound shown in the general formula III is a compound shown in the following formulas III-a to III-d,
9. a positive-negative mixture liquid crystal composition according to claim 2, wherein: the compound shown in the general formula IV is a compound shown in the following formulas IV-a to IV-c,
10. a positive-negative mixture liquid crystal composition according to claim 2, wherein: the compound shown in the general formula V is a compound shown in the following formulas V-a to V-f,
11. the positive-negative mixture liquid crystal composition according to any one of claims 1 to 10, wherein: the liquid crystal composition further comprises one or more additive components selected from the group consisting of UV stabilizers, dopants, antioxidants.
12. Use of a positive-negative mixture liquid crystal composition according to any one of claims 1 to 10 in a liquid crystal display device.
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| CN104774623B (en) * | 2015-03-13 | 2017-03-01 | 北京八亿时空液晶科技股份有限公司 | A kind of liquid-crystal composition and its application |
| CN106554783B (en) * | 2015-09-25 | 2019-05-21 | 北京八亿时空液晶科技股份有限公司 | A kind of liquid-crystal composition and its application with high transmittance |
| KR20170088297A (en) * | 2016-01-22 | 2017-08-01 | 주식회사 동진쎄미켐 | Liquid crystal composition |
| CN107189791B (en) * | 2016-03-15 | 2020-10-27 | 北京八亿时空液晶科技股份有限公司 | Positive and negative mixed liquid crystal composition and application thereof |
| CN107619669A (en) * | 2016-07-15 | 2018-01-23 | 北京八亿时空液晶科技股份有限公司 | A kind of liquid-crystal composition and its application with fast-response |
| CN107779201B (en) * | 2016-08-29 | 2021-03-05 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition and liquid crystal display element |
| EP3299438B1 (en) * | 2016-09-23 | 2020-01-15 | Merck Patent GmbH | Liquid-crystalline medium and liquid-crystal display comprising the same |
| CN108219802B (en) * | 2016-12-14 | 2021-11-02 | 江苏和成显示科技有限公司 | Liquid crystal composition and application thereof |
| CN108659861A (en) * | 2017-03-31 | 2018-10-16 | 北京八亿时空液晶科技股份有限公司 | A kind of liquid-crystal composition and its application with high transmittance |
| JP6662495B2 (en) * | 2017-07-10 | 2020-03-11 | Dic株式会社 | Composition and liquid crystal display device using the same |
| CN109423302B (en) * | 2017-08-21 | 2021-01-15 | 北京八亿时空液晶科技股份有限公司 | Liquid crystal composition with high transmittance and application thereof |
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