CN105295955A - Positive and negative mixed liquid crystal composition - Google Patents
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 113
- 239000000203 mixture Substances 0.000 title claims abstract description 69
- 150000001875 compounds Chemical class 0.000 claims abstract description 54
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims description 61
- 125000000217 alkyl group Chemical group 0.000 claims description 32
- 125000003342 alkenyl group Chemical group 0.000 claims description 24
- 125000003545 alkoxy group Chemical group 0.000 claims description 24
- 125000001140 1,4-phenylene group Chemical group [H]C1=C([H])C([*:2])=C([H])C([H])=C1[*:1] 0.000 claims description 5
- 150000005215 alkyl ethers Chemical class 0.000 claims description 5
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- 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 5
- -1 4-cyclohexenyl Chemical group 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 abstract description 24
- 230000004044 response Effects 0.000 abstract description 21
- 238000012360 testing method Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 11
- 230000008901 benefit Effects 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 210000002858 crystal cell Anatomy 0.000 description 3
- 230000006750 UV protection Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 2
- MWMBZADOGRGJDP-UHFFFAOYSA-N CCCC(CC(C)(C)NCC)OC(CCCCCCCCC(OC(CC(C)(C)C)CC(C)(C)N)=O)=O Chemical compound CCCC(CC(C)(C)NCC)OC(CCCCCCCCC(OC(CC(C)(C)C)CC(C)(C)N)=O)=O MWMBZADOGRGJDP-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZMXYNJXDULEQCK-UHFFFAOYSA-O Cc(cc1)cc([NH3+])c1O Chemical compound Cc(cc1)cc([NH3+])c1O ZMXYNJXDULEQCK-UHFFFAOYSA-O 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 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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Abstract
The invention discloses a positive and negative mixed liquid crystal composition. The positive and negative mixed liquid crystal composition is characterized by comprising an additive component A which consists of one or more compounds shown in a general formula S-1, a general formula S-2, a structural formula S-3 and a structural formula S-4, a component B which consists of one or more negative compounds shown in a general formula I and a component C which consists of one or more positive compounds shown in a general formula II. According to the positive and negative mixed liquid crystal composition, the problems of low transmittance, low response speed and especially poor anti-ultraviolet capability of the conventional liquid crystal mixture are solved.
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
The display is a process of converting data information using an electrical signal as a propagation medium into visual information using visible light as a propagation medium, and a Man-machine interface (MMI) is a device for completing the 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, a thin film transistor liquid crystal display (TFT-LCD) has become a mainstream product in LCD applications.
In terms of the operating principle, the LCD device generates light from a backlight source by using a polarizer, a liquid crystal cell (liquid crystal molecules), and the like, to generate light and shade corresponding to an image to be displayed, thereby changing colors and realizing image display recognizable to people. 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. For the dielectric constant of the electric field parallel to the director of the liquid crystal∥Indicating the dielectric constant of the electric field perpendicular to the director of the liquid crystal⊥Denotes that the dielectric anisotropy constant is Δ ═∥-⊥. If the liquid crystal molecule is very polarThe direction of the permanent dipole moment of the group coincides with the long axis direction of the molecule, and the degree of electron shift in the long axis direction of the liquid crystal molecule is the largest, so that the liquid crystal has a large dipole moment in the direction parallel to the long axis of the molecule, 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.
In the production and use of LCD devices, liquid crystal will inevitably be affected by Ultraviolet (UV) radiation, and in order to reduce the power consumption of LCD devices, it is required that the transmittance of liquid crystal should be as high as possible, so a negative component is added to a positive liquid crystal to improve the transmittance, but the addition of the negative component often causes the UV performance of mixed crystal to be reduced, and the Ultraviolet (UV) radiation can destroy the molecular structure of the liquid crystal medium, and affect the physical parameters thereof, and finally cause the display bad phenomenon, so the ultraviolet stability of liquid crystal must be considered in the practical application of LCD.
Disclosure of Invention
The invention provides a positive and negative mixed liquid crystal composition to solve the problems of low transmittance, slow response speed and poor UV resistance of the existing liquid crystal mixture.
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 one or more additive components A selected from compounds shown in a general formula S-1, a general formula S-2, a structural formula S-3 and a structural formula S-4, a component B composed of one or more negative compounds shown in a general formula I, and a component C composed of one or more positive compounds shown in a general formula II,
wherein,
R1、R3each independently representAny 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;
(O)R2represents any one of a C1-5 linear alkyl group or a C1-5 linear alkyl ether in which an oxygen atom is bonded to a benzene ring;
R9、R10each independently represents any group of linear alkyl groups having 1-10 carbon atoms;
X1、X2、X3、X4each independently represents one of H or F;
Y1represents F, or any group of straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or multi-substituted by F;
each independently represents any one or more of the following groups,
① trans-1, 4-cyclohexylene, 1, 4-cyclohexenyl, wherein one or more non-adjacent-CH' s2The radical-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;
Z1、Z2each independently represents a single bond, -CH2-、-CH2-CH2-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
a. b each independently represents 0, 1 or 2, and when a is 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 D consisting of one or more compounds shown in a general formula III, a general formula IV and/or a general formula V,
wherein,
R4、R5、R6、R7、R8each independently representAny 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;
X5、X6each independently represents one of H or F;
Y2represents F, or any group of straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or multi-substituted by F;
each independently represents any one or more of the following groups,
⑴ trans-1, 4-cyclohexylene, 1, 4-cyclohexenyl, wherein one or more non-adjacent-CH' s2The radical-is substituted or unsubstituted by-O-or-S-,
1, 4-phenylene groups, wherein one or two-CH-groups are substituted or unsubstituted by N, and one or two H groups are substituted or unsubstituted by F;
Z3each independently represents a single bond, -CH2-、-CH2-CH2-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
c. d and e each independently represent 0 or 1.
The technical scheme of the invention is further improved as follows: the concentration range of the additive component A in the liquid crystal composition is 1-3000 ppm, the weight percentage content of the component B in the liquid crystal composition is 5-20%, and the weight percentage content of the component C in the liquid crystal composition is 10-60%.
The technical scheme of the invention is further improved as follows: in the liquid crystal composition, the weight percentage of the component D is 20-70%, and the sum of the weight percentages of the component B, the component C and the component D is 100%.
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,
wherein,
R1to representAny 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;
(O)R2represents any one of a C1-5 linear alkyl group or a C1-5 linear alkyl ether in which an oxygen atom is bonded to a benzene ring.
The technical scheme of the invention is further improved as follows: the positive compounds shown in the general formula II are specifically compounds shown in the following formulas II-a to II-r 1,
wherein,
R3represents any one of an 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;
Y1represents F, or any group of linear alkyl with 1-6 carbon atoms, linear alkoxy or linear alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F,
(F) represents either H or F.
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-j,
wherein,
R4、R5each independently representAny 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.
The technical scheme of the invention is further improved as follows: the compound shown in the general formula IV is specifically a compound shown in the following formulas IV-a to IV-c,
wherein,
R6to representAny 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;
Y2represents F, or any group of linear alkyl with 1-6 carbon atoms, linear alkoxy or linear alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F,
(F) represents either H or F.
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,
wherein,
R7、R8each independently representCarbon number of 110 straight chain alkyl group, straight chain alkoxy group having 1 to 10 carbon atoms, or straight chain alkenyl group having 2 to 10 carbon atoms.
The technical scheme of the invention also comprises the application of the positive and negative mixed liquid crystal composition in a liquid crystal display device.
The positive and negative mixed liquid crystal composition is mainly applied to IPS-TFT, FFS-TFT and OCB mode liquid crystal display devices.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the liquid crystal composition provided by the invention can increase the mixed liquid crystal by adding the negative liquid crystal component into the traditional 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.
According to the invention, by adding a certain UV stabilizing additive, the deterioration effect of UV light on the positive and negative mixed liquid crystal composition is reduced, so that the UV stability of the liquid crystal composition is obviously improved, and further the liquid crystal composition with positive dielectric, high transmittance, low rotational viscosity, quick response time and especially good UV stability is obtained. There are many additives having UV resistance, but the additives that can be practically applied to liquid crystals need to be verified in their kinds and addition amounts by a great number of tests. The solution provided by the invention is suitable for improving the UV performance of the hybrid liquid crystal.
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 penetration rate, good stability and the like.
Detailed Description
The invention discloses a positive-negative mixed liquid crystal composition, which comprises one or more components A selected from compounds shown in a general formula S-1, a general formula S-2, a structural formula S-3 and a structural formula S-4, a component B comprising one or more negative compounds shown in a general formula I, a component C comprising one or more positive compounds shown in a general formula II, and a component D comprising one or more compounds shown in a general formula III, a general formula IV and/or a general formula V,
wherein,
R1、R3、R4、R5、R6、R7、R8each independently representAny 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;
(O)R2represents any one of a C1-5 linear alkyl group or a C1-5 linear alkyl ether in which an oxygen atom is bonded to a benzene ring;
R9、R10each independently represents any group of linear alkyl groups having 1-10 carbon atoms;
X1、X2、X3、X4、X5、X6each independently represents one of H or F;
Y1、Y2represents F, or any group of alkyl, alkoxy or alkenyl with 1-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F;
each independently represents any one or more of the following groups,
① trans-1, 4-cyclohexylene, 1, 4-cyclohexenyl, wherein one or more non-adjacent-CH' s2The radical-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;
Z1、Z2、Z3each independently represents a single bond, -CH2-、-CH2-CH2-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
a. b each independently represents 0, 1 or 2, and when a is 2,which may be the same or different, when b is 2,may be the same or different; c. d and e each independently represent 0 or 1.
The invention discloses a positive and negative mixed liquid crystal composition, wherein the concentration range of an additive component A in the liquid crystal composition is 1-3000 ppm. More preferably: the concentration range of the additive component A in the liquid crystal composition is 50-1000 ppm.
The invention discloses a positive-negative mixed liquid crystal composition, wherein in the liquid crystal composition, the weight percentage of a component B is 5-20%, the weight percentage of a component C is 10-60%, and the weight percentage of a component D is 20-70%. The weight percentage of the components is further preferably as follows: the weight percentage of the component B is 6-20%, the weight percentage of the component C is 10-60%, and the weight percentage of the component D is 25-70%. The sum of the weight percentages of the component B, the component C and the component D is 100 percent.
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 TOYOSR6517 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 test equipment is a TOYOModel6254 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-micron IPS test box, the electrode spacing and the electrode width are both 10 microns, 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)
Data comparison of Performance parameter test results for examples 1-8 and comparative examples 1-2
VHR data comparison tables for examples 1-8 and comparative examples 1-2
As can be seen from comparison of comparative example 1 and comparative example 2, the negative liquid crystal compound of components I-b is added in comparative example 1, the transmittance is obviously increased, and the performance in other aspects, clearing point, refractive index, response time and resistivity are not lost, and the level is still equivalent to that of a pure liquid crystal compound, so that the liquid crystal composition with quick response and high transmittance is obtained. But the UV stability of the liquid crystal composition is significantly reduced due to the addition of the negative liquid crystal compound.
As can be seen from the comparison between the example 1 and the comparative examples 1 and 2, the negative liquid crystal compound of the component I is added into the example 1, the transmittance is obviously increased, and the performance in other aspects, clearing point, refractive index, response time and resistivity are not lost, and the level is still equivalent to that of a pure liquid crystal compound, so that the liquid crystal composition with quick response and high transmittance is obtained. Furthermore, VHR of the liquid crystal compositions of comparative examples 1 and 2 is obviously reduced after UV irradiation, especially the hybrid liquid crystal mixture formed by mixing the positive liquid crystal compound and the negative liquid crystal compound of comparative example 2, while VHR of example 1 is only slightly reduced after UV irradiation, which shows that the UV stability of example 1 is obviously improved compared with that of comparative examples 1 and 2 due to the addition of S-1 compounds.
The positive-negative mixed liquid crystal composition of embodiment 2 has a large refractive index, a high transmittance, and a fast response, is suitable for display applications such as IPS-TV with a large size and a low cell thickness, and is advantageous for realizing performances such as a wide viewing angle, a high contrast, and a high-quality dynamic picture playing. And due to the addition of the S-1 and S-3 compounds, the UV stability of the positive and negative mixed liquid crystal composition is also very excellent.
The positive-negative mixed liquid crystal composition of example 3 has a wide temperature application range, a large refractive index, a high transmittance, a fast response, good high and low temperature stability and excellent UV stability, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display applications such as vehicle-mounted display.
The positive-negative mixed liquid crystal composition in the embodiment 4 has proper refractive index and clearing point, high transmittance, quick response and good UV stability, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display applications of medium-sized and small-sized pads, mobile phones and the like.
The positive-negative mixed liquid crystal composition of example 5 has suitable refractive index and clearing point, high transmittance, fast response, excellent UV stability, combines the wide viewing angle advantage of IPS display mode, and is suitable for handheld terminal display applications.
The positive-negative mixed liquid crystal composition of embodiment 6 has a suitable refractive index and clearing point, a high transmittance, a fast response, an excellent UV stability, and combines the wide viewing angle advantage of the IPS display mode, and is suitable for small-size display applications such as smart phones.
The positive-negative mixed liquid crystal composition of example 7 has a large refractive index, a high transmittance, and a fast response, is suitable for display applications such as IPS-TV of a large size with a low cell thickness, and is advantageous for realizing performances such as a wide viewing angle, a high contrast, and a high-quality dynamic picture playing. And due to the addition of the S-1 and S-3 compounds, the UV stability of the mixed crystal is also very excellent.
The positive-negative mixed liquid crystal composition of example 8 has a wide temperature application range, a large refractive index, a high transmittance, a fast response, good high and low temperature stability and excellent UV stability, combines the wide viewing angle advantage of the IPS display mode, and is suitable for display applications such as on-vehicle applications.
From examples 1-8, it can be seen that the positive and negative mixed liquid crystal composition of the present invention can achieve high transmittance, fast response time and good stability, and the addition of the S-1, S-2, S-3 and S-4 additives can effectively improve the UV stability of the mixed crystal, and can be applied to IPS-TFT, FFS-TFT and OCB mode displays.
Although the present invention only exemplifies specific substances and weight percentages of the above 8 examples, and tests the properties 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 preferred compounds of the general formulas I, II, III, IV and V to further develop and modify on the basis of the above examples, so as to achieve the purpose of the present invention.
Claims (10)
1. A positive-negative mixed liquid crystal composition characterized by: the liquid crystal composition comprises one or more additive components A consisting of compounds shown in a general formula S-1, a general formula S-2, a structural formula S-3 and a structural formula S-4, a component B consisting of one or more negative compounds shown in a general formula I, and a component C consisting of one or more positive compounds shown in a general formula II,
wherein,
R1、R3each independently representAny 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;
(O)R2represents any one of a C1-5 linear alkyl group or a C1-5 linear alkyl ether in which an oxygen atom is bonded to a benzene ring;
R9、R10each independently represents any group of linear alkyl groups having 1-10 carbon atoms;
X1、X2、X3、X4each independently represents one of H or F;
Y1represents F, or any group of straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or multi-substituted by F;
each independently represents any one or more of the following groups,
① trans-1, 4-cyclohexylene, 1, 4-cyclohexenyl, wherein one or more non-adjacent-CH' s2The radical-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;
Z1、Z2each independently represents a single bond, -CH2-、-CH2-CH2-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4Any one of-or-CF ═ CF-；
a. b each independently represents 0, 1 or 2, and when a is 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 D consisting of one or more compounds shown in a general formula III, a general formula IV and/or a general formula V,
wherein,
R4、R5、R6、R7、R8each independently representAny 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;
X5、X6each independently represents one of H or F;
Y2represents F, or any group of straight-chain alkyl with 1-6 carbon atoms, straight-chain alkoxy or straight-chain alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or multi-substituted by F;
each independently represents any one or more of the following groups,
⑴ trans-1, 4-cyclohexylene, 1, 4-cyclohexenylIn which one or more non-adjacent-CHs2The radical-is substituted or unsubstituted by-O-or-S-,
1, 4-phenylene groups, wherein one or two-CH-groups are substituted or unsubstituted by N, and one or two H groups are substituted or unsubstituted by F;
Z3each independently represents a single bond, -CH2-、-CH2-CH2-、-CH＝CH-、-C≡C-、-COO-、-OOC-、-CF2O-、-OCH2-、-CH2O-、-OCF2-、-CF2CH2-、-CH2CF2-、-C2F4-or-CF ═ CF —;
c. d and e each independently represent 0 or 1.
3. A positive-negative mixture liquid crystal composition according to claim 1, wherein: the concentration range of the additive component A in the liquid crystal composition is 1-3000 ppm, the weight percentage content of the component B in the liquid crystal composition is 5-20%, and the weight percentage content of the component C in the liquid crystal composition is 10-60%.
4. A positive-negative mixture liquid crystal composition according to claim 2, wherein: in the liquid crystal composition, the weight percentage of the component D is 20-70%, and the sum of the weight percentages of the component B, the component C and the component D is 100%.
5. A positive-negative mixture liquid crystal composition according to any one of claims 1 to 4, wherein: the negative compound shown in the general formula I is a compound shown in the following formulas I-a to I-e,
wherein,
R1to representAny 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;
(O)R2represents any one of a C1-5 linear alkyl group or a C1-5 linear alkyl ether in which an oxygen atom is bonded to a benzene ring. .
6. The positive-negative mixed liquid crystal composition according to any one of claims 1 to 4, wherein the positive compound represented by the general formula II is a compound represented by the following formulae II-a to II-r 1,
wherein,
R3represents any one of an 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;
Y1represents F, or any group of linear alkyl with 1-6 carbon atoms, linear alkoxy or linear alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F,
(F) represents either H or F.
7. A positive-negative mixture liquid crystal composition according to any one of claims 1 to 4, wherein: the compound shown in the general formula III is a compound shown in the following formulas III-a to III-j,
wherein,
R4、R5each independently representAny 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.
8. A positive-negative mixture liquid crystal composition according to any one of claims 1 to 4, wherein: the compound shown in the general formula IV is specifically a compound shown in the following formulas IV-a to IV-c,
wherein,
R6to representAny of a C1-10 linear alkyl group, a C1-10 linear alkoxy group, or a C2-10 linear alkenyl groupA group;
Y2represents F, or any group of linear alkyl with 1-6 carbon atoms, linear alkoxy or linear alkenyl with 2-6 carbon atoms, wherein H is unsubstituted, mono-substituted or poly-substituted by F,
(F) represents either H or F.
9. A positive-negative mixture liquid crystal composition according to any one of claims 1 to 4, wherein: the compound shown in the general formula V is a compound shown in the following formulas V-a to V-f,
wherein,
R7、R8each independently representAny 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.
10. Use of a positive-negative mixture liquid crystal composition according to any one of claims 1 to 4 in a liquid crystal display device.
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