CN112048313B - 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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- 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
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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
- C09K19/46—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 containing esters
Abstract
The invention relates to a liquid crystal composition and a liquid crystal display device thereof, wherein the liquid crystal composition comprises at least one compound shown as a general formula I and at least one compound shown as a general formula II; the liquid crystal display device comprises the liquid crystal composition. The two compounds with specific structures in the liquid crystal composition provided by the invention can be matched with each other, have synergistic interaction, can further reduce the driving voltage on the premise of keeping the dielectric anisotropy at the same level, and have good low-temperature intersolubility.
Description
Technical Field
The invention belongs to the technical field of liquid crystal materials, and relates to a liquid crystal composition and a liquid crystal display device thereof.
Background
Liquid crystal display elements are used in various household electric appliances such as watches and calculators, measuring instruments, automobile panels, word processors, computers, printers, televisions, and the like. The display mode is classified into PC (phase change), TN (twisted nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), VA (vertical alignment), and the like, according to the type of the display mode. The driving method of the device is classified into a PM (passive matrix) type and an AM (active matrix) type. PM is classified into static (static) and multiplex (multiplex) types. AM is classified into a TFT (thin film transistor), an MIM (metal insulator metal), and the like. The types of the TFT include amorphous silicon (amorphous silicon) and polycrystalline silicon (polysilicon). The latter is classified into a high temperature type and a low temperature type according to a manufacturing process. Liquid crystal display elements are classified into a reflection type using natural light, a transmission type using a backlight, and a semi-transmission type using both light sources of natural light and backlight, depending on the type of light source.
In low information content, passive driving is generally used, but as the information content increases, the display size and the number of display paths increase, and the crosstalk and contrast reduction phenomenon become serious, so that Active Matrix (AM) driving is generally used, and Thin Film Transistors (TFTs) are often used for driving at present. In an AM-TFT device, the TFT switching devices are addressed in a two-dimensional grid, charge up the pixel electrodes for a limited time while on, and then turn off until addressed again in the next cycle. Therefore, between two addressing periods, it is not desirable that the voltage on the pixel is changed, otherwise the transmittance of the pixel is changed, resulting in unstable display. The rate of discharge at a pixel depends on the electrode capacity and the resistivity of the dielectric material between the electrodes. Therefore, the liquid crystal material is required to have higher resistivity, good chemical and thermal stability and stability to electric fields and electromagnetic radiation, and simultaneously, the material is required to have proper optical anisotropy delta n, dielectric anisotropy, low-temperature intersolubility and lower threshold voltage so as to achieve the purposes of reducing driving voltage and reducing power consumption; the liquid crystal composition is reported in WO9202597, WO9116398, WO9302153, WO9116399, CN1157005A and other patents, but the good performance of the liquid crystal composition is difficult to ensure.
A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can reduce the base voltage value, reduce the driving voltage, and further reduce the power consumption.
The liquid crystal display element containing the liquid crystal composition with lower threshold voltage can effectively reduce the power consumption of display, and has longer endurance time particularly in consumables and portable electronic products such as mobile phones and tablet computers. However, the liquid crystal composition with a lower threshold voltage (generally containing a large dielectric polar group) has a low molecular order, and the Kave value of the order of the liquid crystal molecules is also reduced, so that the light leakage and the contrast of the liquid crystal material are affected, and the two are generally difficult to be compatible.
The liquid crystal composition with low viscosity can improve the response speed of the liquid crystal display element. When the response speed of the liquid crystal display element is high, the liquid crystal display element can be applied to animation display. In addition, when the liquid crystal composition is injected into the cell of the liquid crystal display device, the injection time can be shortened, and the workability can be improved. The rotational viscosity gamma 1 directly influences the response of the liquid crystal after power-onTime, whether rise time (τ) on ) Or fall time (tau) off ) Are all in direct proportion to the rotational viscosity gamma 1 of the liquid crystal, and the rise time (tau) on ) The liquid crystal cell thickness can be adjusted by increasing the driving voltage and reducing the liquid crystal cell thickness due to the relation between the liquid crystal cell and the driving voltage; and fall time (tau) off ) Irrespective of the driving voltage, mainly the elastic constant of the liquid crystal and the cell thickness, the thinning of the cell thickness reduces the fall time (τ) off ) In different display modes, the movement modes of liquid crystal molecules are different, and the three modes of TN, IPS and VA are in inverse proportion to the average elastic constant K, the torsional elastic constant and the bending elastic constant respectively.
Therefore, it is difficult to achieve a good balance among the properties of the liquid crystal composition, and particularly, to ensure good dielectric properties, driving voltage, and compatibility, and therefore, intensive research on such properties is needed in the art to develop a liquid crystal composition that can further reduce driving voltage while maintaining dielectric anisotropy at the same level, and that has good low-temperature compatibility.
Disclosure of Invention
The invention aims to provide a liquid crystal composition which can further reduce the driving voltage on the premise of keeping the dielectric anisotropy at the same level and has good low-temperature intersolubility.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a liquid crystal composition, which comprises at least one compound shown in a general formula I and at least one compound shown in a general formula II;
the R is 1 、R 2 、R 3 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
the X1 represents an alkenyl group having 2 to 10 carbon atoms.
The liquid crystal composition provided by the invention simultaneously comprises the compounds in the general formulas I and II, the two compounds with specific structures can be matched with each other, the synergy is realized, the driving voltage can be further reduced on the premise of keeping the dielectric anisotropy at the same level, and the low-temperature intersolubility is good.
Preferably, the compound of formula I accounts for 1-50% of the total mass of the liquid crystal composition, such as 2%, 5%, 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 44%, 45%, 48%, etc., preferably 1-30%, more preferably 3-30%.
Preferably, the compound of formula II accounts for 1 to 50% of the total mass of the liquid crystal composition, such as 2%, 5%, 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 44%, 45%, 48%, etc., preferably 1 to 45%, more preferably 1 to 35%.
Preferably, the compound of the general formula I is any one of or a combination of at least two of the compounds having the following structures:
the R is 1 With the same limitations as before.
Preferably, the compound of formula II is any one of or a combination of at least two of the compounds having the following structures:
the R is 2 Having the same limitations as previously described.
Preferably, the liquid crystal composition further comprises at least one compound of formula III;
the R is 4 、R 5 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
the rings A1, A2 and A3 each independently represent
Wherein the dotted line represents the site of attachment of the group;
z is 1 、Z 2 Each independently represents a single bond, -CH 2 CH 2 -、-CH 2 O-、-OCH 2 -, -COO-or-OCO-;
when n1 is 0, 1 or 2 and n1 is 2, rings A2 are the same or different;
the compounds of formula III do not include compounds of formula I.
Preferably, the compound of formula III is any one of or a combination of at least two of the compounds having the following structures:
preferably, the compound of formula III accounts for 10-90% of the total mass of the liquid crystal composition, such as 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 44%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 72%, 75%, 80%, 85%, 88%, etc., preferably 15-80%, more preferably 20-75%.
Preferably, the liquid crystal composition further comprises at least one compound of formula IV;
said R is 6 、R 7 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
the rings A4 and A5 represent
Wherein the dotted line represents the site of attachment of the group;
z is 3 Represents a single bond, -CH 2 CH 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-O-CO-、-CF 2 O-、-OCF 2 -or-CH ═ CH-;
said L 1 、L 2 Each independently represents-F or-Cl;
said L is 3 And L 4 Each independently represents-H or-CH 3 ；
N2 represents 0, 1 or 2, and when n2 represents 2, rings A5 are the same or different;
the compounds of formula IV do not include compounds of formula II.
Preferably, the compound of formula IV is any one of or a combination of at least two of the compounds having the following structures:
preferably, the compound of formula IV accounts for 5 to 75% of the total mass of the liquid crystal composition, such as 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 44%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 72%, etc., preferably 10 to 70%, more preferably 10 to 65%.
Another object of the present invention is to provide a liquid crystal display device comprising the liquid crystal composition provided by the present invention.
Compared with the prior art, the invention has the following beneficial effects:
the liquid crystal composition provided by the invention simultaneously comprises the compounds of the general formulas I and II, the two compounds with specific structures can be matched with each other, the synergy can be realized, the driving voltage can be further reduced on the premise of keeping the dielectric anisotropy at the same level, and the liquid crystal composition has good low-temperature intersolubility and threshold voltage V 10 2.279-3.901V, saturation voltage V 90 Is 3.687-5.542V, and has a characteristic voltage V at 100% relative transmittance 100 Is 5.348-7.279V, and always presents a nematic phase state in a low-temperature observation bottle for 10 days and always presents a nematic phase state in a liquid crystal low-temperature test box for 15 days.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
For convenience of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in table 1:
TABLE 1
In table 1, the dotted line represents the site of attachment of the group.
Compounds of the following formula are exemplified:
the structural formula is represented by the code listed in Table 1, and can be expressed as: nCCGF, wherein n in the code represents the number of C atoms of the left alkyl group, for example, n is 3, namely, the alkyl group is-C 3 H 7 (ii) a C in the code represents cyclohexane, G represents 2-fluoro-1, 4-phenylene and F represents fluorine.
Comparative example 1
The comparative example provides a liquid crystal composition comprising the following components in percentage by mass:
comparative example 2
The comparative example provides a liquid crystal composition comprising the following components in percentage by mass:
comparative example 3
The comparative example provides a liquid crystal composition comprising the following components in percentage by mass:
example 1
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 2
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 3
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
| components | Content (%) |
| 2CPP2V1(I-4) | 6 |
| 3CPP2V1(I-4) | 4 |
| 2C1OWO2(II-2) | 5 |
| 3C1OWO2(II-2) | 5 |
| 3CC2(III-1) | 8 |
| 5PP1(III-3) | 10 |
| 3CCV1(III-1) | 7.5 |
| 3CPP2(III-11) | 9 |
| 3CPPC3(III-23) | 2 |
| 4CC1OWO2(IV-7) | 4 |
| 2CWO2(IV-1) | 7.5 |
| 3CWO2(IV-1) | 9 |
| 4CWO2(IV-1) | 4 |
| 3CCWO2(IV-3) | 10 |
| 5CCWO2(IV-3) | 9 |
Example 4
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
| components | Content (%) |
| 2CPPV(I-2) | 6 |
| 3CPPV(I-2) | 4 |
| 2C1OWO2(II-2) | 5 |
| 3C1OWO2(II-2) | 5 |
| 3CC2(III-1) | 8 |
| 5PP1(III-3) | 10 |
| 3CCV1(III-1) | 7.5 |
| 3CPP2(III-11) | 9 |
| 3CPPC3(III-23) | 2 |
| 4CC1OWO2(IV-7) | 4 |
| 2CWO2(IV-1) | 7.5 |
| 3CWO2(IV-1) | 9 |
| 4CWO2(IV-1) | 4 |
| 3CCWO2(IV-3) | 10 |
| 5CCWO2(IV-3) | 9 |
Example 5
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 6
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 7
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 8
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 9
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
example 10
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
| components | Content (%) |
| 2CPP2V(I-1) | 5 |
| 4C1OWO2(II-2) | 5 |
| 3CC2(III-1) | 20.5 |
| 5PP1(III-3) | 10 |
| 3CCV1(III-1) | 7.5 |
| 3CPP2(III-11) | 8 |
| 2CPP2(III-11) | 6 |
| 2CCP2(III-12) | 7 |
| 3CCP2(III-12) | 7 |
| 3CPPC3(III-23) | 2 |
| 2CCWO2(IV-3) | 10 |
| 3CCWO2(IV-3) | 10 |
| 3PWP4(IV-5) | 2 |
Example 11
The embodiment provides a liquid crystal composition, which comprises the following components in percentage by mass:
| components | Content (%) |
| 2CPP2V1(I-4) | 6 |
| 3CPP2V1(I-4) | 4 |
| 2CPP2V(I-1) | 6 |
| 3CPP2V(I-1) | 5 |
| 2C1OWO2(II-2) | 6 |
| 3C1OWO2(II-2) | 6 |
| 3CC2(III-1) | 8 |
| 5PP1(III-3) | 8 |
| 3CPPC3(III-23) | 2 |
| 4CC1OWO2(IV-7) | 4 |
| 2CWO2(IV-1) | 8 |
| 3CWO2(IV-1) | 11 |
| 4CWO2(IV-1) | 8 |
| 3CCWO2(IV-3) | 8 |
| 5CCWO2(IV-3) | 10 |
The liquid crystal compositions in the above examples and comparative examples were subjected to the following performance tests:
(1) cp (. degree. C.) represents a clearing point of liquid crystal and is measured by a melting point meter quantitative method;
(2) DELTA.n represents optical anisotropy and was measured at 25 ℃ using an Abbe refractometer under a sodium lamp (589nm) light source. Δ n is ne-no, no is the refractive index of the ordinary light, and ne is the refractive index of the extraordinary light;
(3) Δ ∈ represents dielectric anisotropy, and ∈/∈ value, Δ ∈ ═ ∈ ═ epsilon ∈ were measured by an LCR meter, where ∈/is a dielectric constant parallel to a molecular axis, ∈ ″) is a dielectric constant perpendicular to the molecular axis, the test conditions were 25 ± 0.5 ℃, 1KHz, the test cell was a VA cell, and the cell thickness was 6 μm;
(4) η (cP) represents the flow viscosity, as determined by an E-type viscometer, at 25. + -. 0.5 ℃ under test conditions;
(5) gamma 1 (mPas) represents rotational viscosity, as determined by INSTEC: ALCTIR1LCM-2, at 25 + -0.5 deg.C in 20 μm parallel boxes;
the results of performance tests 1-5 are shown in Table 2;
(6) measurement of threshold voltage V by DMS505 instrument 10 The characteristic voltage is at 10% relative transmittance, and the test condition is 25 ℃ and the square wave frequency is 60 Hz;
(7) measurement of saturation voltage V by DMS505 instrument 90 The characteristic voltage is at 90% relative transmittance, and the test condition is 25 ℃ and the square wave frequency is 60 Hz;
(8) the characteristic voltage V at 100% relative transmittance is measured by DMS505 instrument 100 The testing condition is 25 ℃ and the square wave frequency is 60 Hz;
the results of performance tests 6-8 are shown in Table 3;
(9) and (3) testing the low-temperature storage performance: observing whether crystals are precipitated every day in low-temperature thermostats at-20 ℃ and-30 ℃.
The results of performance test 9 are shown in table 4.
TABLE 2
TABLE 3
TABLE 4
| -20℃bottle | -30℃cell | |
| Comparative example 1 | NG for 10 days | NG for 15 days |
| Comparative example 2 | NG for 10 days | 15 days NG |
| Comparative example 3 | NG for 9 days | NG for 13 days |
| Example 1 | 10 days OK | 15 days OK |
| Example 2 | 10 days OK | 15 days OK |
| Example 3 | 10 days OK | 15 days OK |
| Example 4 | 10 days OK | 15 days OK |
| Example 5 | 10 days OK | 15 days OK |
| Example 6 | 10 days OK | 15 days OK |
| Example 7 | 10 days OK | 15 days OK |
| Example 8 | 10 days OK | 15 days OK |
| Example 9 | 10 days OK | 15 days OK |
| Example 10 | 10 days OK | 15 days OK |
| Example 11 | OK for 10 days | 15 days OK |
Note: the cell refers to a liquid crystal low-temperature test box, the bottle refers to a low-temperature observation bottle, and NG indicates that crystal precipitation or a phenomenon that a liquid crystal composition is changed from a nematic phase to a smectic phase occurs; OK indicates that the liquid crystal composition is always in a nematic phase state.
From the results of tables 2 to 4, it is understood that the liquid crystal composition provided by the present invention can further reduce the driving voltage while maintaining the dielectric anisotropy at the same level, and has good low-temperature miscibility.
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (5)
1. A liquid crystal composition, characterized in that it comprises at least one compound of formula I and at least one compound of formula II;
the R is 1 、R 2 、R 3 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
x1 represents an alkenyl group having 2 to 10 carbon atoms;
the compound of formula I is a combination of at least two of the compounds having the following structures:
the liquid crystal composition further comprises at least one compound of formula III:
the R is 4 、R 5 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
the rings A1, A2 and A3 each independently represent
Wherein the dotted line represents the site of attachment of the group;
z is 1 、Z 2 Each independently represents a single bond, -CH 2 CH 2 -、-CH 2 O-、-OCH 2 -, -COO-or-OCO-;
when n1 is 0, 1 or 2 and n1 is 2, rings A2 are the same or different;
the compound of formula III comprises at least one compound of III-3 and at least one compound of III-23:
the compounds of formula III do not include compounds of formula I;
the liquid crystal composition further comprises at least one compound of formula IV:
the R is 6 、R 7 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;
the rings A4 and A5 each independently represent
Wherein the dotted line represents the site of attachment of the group;
z is 3 Represents a single bond, -CH 2 CH 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-O-CO-、-CF 2 O-、-OCF 2 -or-CH ═ CH-;
said L 1 、L 2 Each is independentrepresents-F or-Cl;
said L 3 And L 4 Each independently represents-H or-CH 3 ；
N2 represents 0, 1 or 2, and when n2 represents 2, rings A5 are the same or different;
the compound of formula IV comprises at least one compound of IV-1 and/or IV-3:
the compounds of formula IV do not include compounds of formula II;
the compound of the general formula I accounts for 10-25% of the total mass of the liquid crystal composition, the compound of the general formula II accounts for 5-20% of the total mass of the liquid crystal composition, the compound of the general formula III accounts for 25-40% of the total mass of the liquid crystal composition, and the compound of the general formula IV accounts for 35-50% of the total mass of the liquid crystal composition.
2. The liquid crystal composition of claim 1, wherein the compound of formula II is any one or a combination of at least two of the following compounds:
the R is 2 Having the same limitations as defined in claim 1.
3. The liquid crystal composition of claim 1, wherein the compound of formula III further comprises any one or a combination of at least two of the compounds having the following structures:
4. the liquid crystal composition of claim 1, wherein the compound of formula IV further comprises any one or a combination of at least two of the compounds having the following structures:
5. a liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 4.
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| CN111484855A (en) * | 2019-01-29 | 2020-08-04 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
| CN111484858B (en) * | 2019-01-29 | 2023-03-14 | 石家庄诚志永华显示材料有限公司 | Liquid crystal composition, liquid crystal display element and liquid crystal display |
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