Fast responding liquid crystal compositions and their use

Abstract

The application belongs to the technical field of liquid crystal materials, and particularly relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. The liquid crystal composition comprises one or more compounds shown in formula I and one or more compounds shown in formula II. The technical scheme provided by the application has a suitable upper and lower limit range of working temperature, suitable dielectric anisotropy, especially larger optical anisotropy, good mutual solubility, especially very good low-temperature stability at-30 DEG C and-40 DEG C, and excellent backlight aging performance; can be used for developing liquid crystal displays with faster response speed, especially capable of improving the residual image phenomenon; and the liquid crystal composition is especially suitable for 3D display technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display. More particularly, it relates to a liquid crystal composition with fast response and application thereof in the field of liquid crystal display. BACKGROUND

[0002] With the rapid development of science and technology, people apply liquid crystal to display field, and the application is more and more extensive, mainly applied in mobile phone, computer, TV, vehicle, outdoor display, medical instrument and other display terminal. As people's demand for display technology is constantly improved, the display industry is also constantly advancing, and the application and demand of liquid crystal display element are also more and more.

[0003] In recent years, the global liquid crystal panel industry roughly faces two main problems: the first is the market demand continues to be weak; the second is the price continues to decline, how to deal with the product price decline close to double digits every year, simply product large-scale, improve the industrial scale is not the best way. Therefore, to develop more value-added panel products, stable unit display area price, is the fundamental interest appeal of liquid crystal panel enterprises. And there are four ways to achieve this: in-cell or on-cell touch integrated screen; 4K or even higher resolution screen; 3D and naked eye 3D screen; and transition to OLED as soon as possible.

[0004] The first term has little to do with the TV industry, which accounts for the majority of liquid crystal panel production, because the TV market does not have a strong demand for touch screens in a wide range, and the integrated large-size touch technology is not yet mature. The last one, which is too much to OLED, faces the dual bottleneck of increased investment burden and immature technology. Therefore, the common choice of panel enterprises is to promote the development of 4K products as soon as possible, and introduce higher-order 3D technology, that is, naked-eye 3D technology products in time. In the process of promoting the popularization of 4K products by panel and TV enterprises, the introduction of naked-eye 3D has an inherent urgency. Because the liquid crystal industry chain has to face the embarrassment that the 4K content source, especially the 4K TV program content, is almost zero. If the problem of what 4K is not solved, consumers will not buy 4K on a large scale. Fortunately, the bottleneck of existing naked-eye 3D technology is low resolution. Because to realize naked-eye 3D, more pixels are used to present the original picture in a unit space, and the resolution will be sacrificed by more than half, even up to three quarters. Therefore, if naked-eye 3D is realized and high-definition effect is guaranteed, liquid crystal panel must provide at least four times the high-definition resolution. Therefore, 4K is actually a "entry-level" resolution for naked-eye 3D. High-resolution display screens have to face the problem of reduced aperture ratio of the panel. The reduction of aperture ratio leads to the reduction of display screen brightness. In order to obtain higher brightness of display picture, the way of increasing the brightness of backlight or increasing the transmittance of liquid crystal material can be used to solve the problem. The brightness of 4K resolution display screen is 1800 nit, which requires that the liquid crystal material can not be easily aged under the long-time irradiation of high-brightness backlight.

[0005] There are two types of applications of liquid crystal materials in 3D display, one is to make liquid crystal panels for display, and the other is to make auxiliary devices such as liquid crystal shutter glasses, liquid crystal grating and liquid crystal lens for realizing 2D / 3D effect conversion.

[0006] For liquid crystal panels, no matter which kind of 3D display mode is prepared to be applied, in order to meet the requirements of end users for more smooth viewing effect (especially for sports programs and racing games), reducing the response time of liquid crystal and making the liquid crystal panel have faster refresh frequency are important goals that manufacturers constantly pursue. A complete response time period includes liquid crystal twist time and recovery time, represented as risetimeτ r and falltimeτ d , which exist between liquid crystal parameters as formula (1), (2),

[0007] τ r = γ1d 2 / ε0Δε (V 2 -V 2 th )(1)

[0008] τ d =γ1d 2 / π 2 K ii (2)

[0009] Where γ1 is the rotational viscosity of the liquid crystal material, d is the gap between liquid crystal cells, and V is the driving voltage of the liquid crystal cell. th ε is the threshold voltage of the liquid crystal material, Δε is the dielectric anisotropy coefficient of the liquid crystal material, and ε0 is the vacuum permittivity.

[0010] For V th With K ii In TN (Twisted Phase) mode:

[0011]

[0012] K ii =K 11 +(K 33 -2K 22 ) / 4

[0013] In IPS (In-Planar Conversion) mode:

[0014]

[0015] K ii =K 22

[0016] In VA (vertical alignment) mode:

[0017]

[0018] K ii =K 33

[0019] K 11 K is the warp elastic constant of the liquid crystal material. 22 K is the torsional elastic constant of the liquid crystal material. 33 denoted as the bending elastic constant of the liquid crystal material, and l as the interelectrode spacing.

[0020] As can be seen from the above formula, to reduce the response time, efforts can be made from four aspects: reducing the rotational viscosity of the liquid crystal material; reducing the gap of the liquid crystal cell; increasing the driving voltage of the liquid crystal cell; and increasing the dielectric anisotropy coefficient of the liquid crystal material. Among them, by improving the process, the gap of the liquid crystal cell can be reduced, the reduction of the gap increases the anchoring force of the alignment layer on the liquid crystal, so that the liquid crystal molecules can be twisted to the position faster, which helps to improve the response speed. Increasing the driving voltage of the liquid crystal cell can also make the liquid crystal molecules twist to the position faster to improve the response speed, but at the same time increase the power consumption and increase the cost of the driving module. The rotational viscosity of the liquid crystal material and the dielectric anisotropy coefficient of the liquid crystal material are directly related to the characteristics of the liquid crystal material itself, and researchers need to conduct repeated tests and compare tests from multiple aspects to determine a stable liquid crystal material that can meet the low response time requirement. This requires continuous efforts of liquid crystal material researchers.

[0021] In another aspect of the use of liquid crystal materials in 3D display, liquid crystal light valves for active shutter glasses and liquid crystal gratings for parallax barrier 3D technology have been widely used, and the research on cylindrical lens technology using liquid crystal materials is still in its infancy. Since liquid crystal materials are used as lens refractive materials, cylindrical lens technology can realize 2D / 3D display conversion. Since an additional liquid crystal cell for controlling optical refraction is needed on the existing liquid crystal cell, it is desirable to make the cell thinner from a practical point of view, which can reduce the thickness of the device on the one hand, and as mentioned earlier, can make the optical lens have a faster response time. As we know, under the condition of certain light transmittance, the cell thickness (d) is inversely proportional to the optical anisotropy coefficient (Δn) of the liquid crystal, so using a thinner liquid crystal cell means using a liquid crystal with a larger Δn. From the perspective of liquid crystal molecules, an effective way to increase the optical anisotropy coefficient of the liquid crystal material is to increase the number of delocalized conjugated π bonds of the liquid crystal molecules, but such large conjugated compounds usually have poor solubility.

[0022] In summary, to realize 3D display on a liquid crystal display device and maintain good viewing effect, the performance of the panel needs to be continuously improved. For example, to ensure brightness, the intensity of the backlight and the number of LED light sources need to be increased; to achieve better resolution, more pixels need to be integrated on the panel; to improve the response speed, the panel needs to be made thinner, the viscosity of the liquid crystal needs to be lower, and the refractive index needs to be larger; to improve the viewing point and viewing angle, a more perfect face recognition system and perfect 3D display technology need to be developed, and these require the participation of liquid crystal materials.

[0023] Therefore, developing a liquid crystal composition with faster response speed, better solubility, and good reliability, especially higher reliability after backlight aging, is a technical problem that needs to be solved at present. SUMMARY

[0024] To solve one or more of the above technical defects, the present application provides a technical solution, the technical solution provided by the present application has a suitable upper and lower limit range of working temperature, a suitable dielectric anisotropy, especially a larger optical anisotropy, a good mutual solubility, especially a very good low-temperature stability at-30℃ and-40℃, and an excellent backlight aging performance; can be used to develop a liquid crystal display with a faster response speed, especially can improve the residual image phenomenon; the liquid crystal composition of the present application is especially suitable for 3D display technology.

[0025] To achieve the above beneficial technical effects, the present application provides a liquid crystal composition comprising one or more compounds represented by formula I and one or more compounds represented by formula II,

[0026]

[0027] wherein,

[0028] R1, R2, R3, R4 each independently represents an alkyl group with a carbon atom number of 1-10, an alkenyl group with a carbon atom number of 2-10, or an alkoxy group with a carbon atom number of 1-10;

[0029] Z1 represents -CH2CH2-, -CH2O-, -CH=CH- or a single bond;

[0030] represents

[0031] m represents 0, 1 or 2; and when m represents 2, the two may be the same or different;

[0032] n represents 0 or 1.

[0033] The second object of the present application is to provide a liquid crystal display element / liquid crystal display, which is mainly in an active matrix display mode.

[0034] Inventive effects

[0035] The technical solution provided by the present application has a suitable upper and lower limit range of working temperature, a suitable dielectric anisotropy, especially a larger optical anisotropy, a good mutual solubility, especially a very good low-temperature stability at-30℃ and-40℃, and an excellent backlight aging performance; can be used to develop a liquid crystal display with a faster response speed, especially can improve the residual image phenomenon; the liquid crystal composition of the present application is especially suitable for 3D display technology. DETAILED DESCRIPTION

[0036] The present application provides a liquid crystal composition comprising one or more compounds represented by Formula I and one or more compounds represented by Formula II,

[0037]

[0038] wherein,

[0039] R1, R2, R3, R4 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0040] Z1 represents -CH2CH2-, -CH2O-, -CH=CH- or a single bond;

[0041] represents

[0042] m represents 0, 1 or 2; and when m represents 2, the two may be the same or different;

[0043] n represents 0 or 1.

[0044] The liquid crystal composition of the present application, preferably, in the aforementioned compound represented by Formula I, R1 represents an alkyl group having 1 to 10 carbon atoms; and R2 represents an alkoxy group having 1 to 10 carbon atoms.

[0045] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula I is selected from the group consisting of compounds represented by Formulas I-1 to I-31,

[0046]

[0047]

[0048] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula I comprises a compound represented by Formula I-9 and / or I-11, and further preferably, the mass content of the aforementioned compound represented by Formula I-9 and / or I-11 is 3 to 10%.

[0049] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II is selected from the group consisting of compounds represented by Formulas II-1 to II-12,

[0050]

[0051]

[0052] wherein,

[0053] R3, R4 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

[0054] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II contains one or more compounds represented by Formula II-2; further preferably, the mass content of the aforementioned compound represented by Formula II-2 is 5 to 20%; more further preferably, the mass content of the aforementioned compound represented by Formula II-2 is 7 to 15%.

[0055] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II contains one or more compounds represented by Formula II-3; further preferably, the mass content of the aforementioned compound represented by Formula II-3 is 5 to 30%; more further preferably, the mass content of the aforementioned compound represented by Formula II-3 is 8 to 25%.

[0056] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II contains one or more compounds represented by Formula II-4; further preferably, the mass content of the aforementioned compound represented by Formula II-4 is 3 to 17%; more further preferably, the mass content of the aforementioned compound represented by Formula II-4 is 5 to 10%.

[0057] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-1 is selected from the group consisting of compounds represented by Formulas II-1-1 to II-1-9,

[0058]

[0059]

[0060] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-2 is selected from the group consisting of compounds represented by Formulas II-2-1 to II-2-8,

[0061]

[0062] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-3 is selected from the group consisting of compounds represented by Formulas II-3-1 to II-3-16,

[0063]

[0064]

[0065] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-4 is selected from the group consisting of compounds represented by Formulas II-4-1 to II-4-16,

[0066]

[0067]

[0068] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-5 is selected from the group consisting of compounds represented by Formulae II-5-1 to II-5-15,

[0069]

[0070]

[0071] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-6 is selected from the group consisting of compounds represented by Formulae II-6-1 to II-6-12,

[0072]

[0073] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-7 is selected from the group consisting of compounds represented by Formulae II-7-1 to II-7-8,

[0074]

[0075] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-8-1 is selected from the group consisting of compounds represented by Formulae II-8-1 to II-8-6,

[0076]

[0077] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-9 is selected from the group consisting of compounds represented by Formulae II-9-1 to II-9-11,

[0078]

[0079]

[0080] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-10 is selected from the group consisting of compounds represented by Formulae II-10-1 to II-10-12,

[0081]

[0082]

[0083] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-11 is selected from the group consisting of compounds represented by Formulae II-11-1 to II-11-7,

[0084]

[0085] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula II-12 is selected from the group consisting of compounds represented by Formulae II-12-1 to II-12-11,

[0086]

[0087]

[0088] The liquid crystal composition of the present application, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula III,

[0089]

[0090] wherein,

[0091] R5, R6 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, and any -CH2- in R5, R6 is optionally substituted with cyclopropylidene or cyclopentylidene.

[0092] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula III is selected from the group consisting of compounds represented by Formulae III-1 to III-6,

[0093]

[0094] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula III comprises a compound represented by Formula III-1 and / or III-2; further preferably, the mass content of the compound represented by Formula III-1 and / or III-2 is 5 to 20%; more further preferably, the mass content of the compound represented by Formula III-1 and / or III-2 is 5 to 16%.

[0095] The liquid crystal composition of the present application, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula IV,

[0096]

[0097] wherein,

[0098] R7, R8 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;

[0099] each independently represents

[0100] The liquid crystal composition of the present application, preferably, the aforementioned compound represented by Formula IV is selected from the group consisting of compounds represented by Formulae IV-1 to IV-3,

[0101]

[0102] wherein,

[0103] R7, R8each 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.

[0104] The liquid crystal composition according to the present application, preferably, the compound represented by the aforementioned formula IV-1 is selected from the group consisting of the compounds represented by the following formulas IV-1-1 to IV-1-12,

[0105]

[0106] The liquid crystal composition according to the present application, preferably, the compound represented by the aforementioned formula IV-1 comprises at least the compound represented by formula IV-1-6; further preferably, the mass content of the compound represented by formula IV-1-6 is ≥ 30%; more preferably, the mass content of IV-1-6 is ≥ 37%.

[0107] The liquid crystal composition according to the present application, preferably, the compound represented by the aforementioned formula IV-2 is selected from the group consisting of the compounds represented by the following formulas IV-2-1 to IV-2-6,

[0108]

[0109] The liquid crystal composition according to the present application, preferably, the compound represented by the aforementioned formula IV-3 is selected from the group consisting of the compounds represented by the following formulas IV-3-1 to IV-3-6,

[0110]

[0111] The liquid crystal composition according to the present application, preferably, the compound represented by the aforementioned formula IV-3 comprises at least the compound represented by formula IV-3-4; further preferably, the mass content of the compound represented by formula IV-3-4 is ≥ 5%; more preferably, the mass content of the compound represented by formula IV-3-4 is ≥ 7%.

[0112] The liquid crystal composition according to the present application, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by formula V,

[0113]

[0114] wherein,

[0115] R9, R 10 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms;

[0116] represents

[0117] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula V is selected from the group consisting of compounds represented by formulas V-1 to V-2 below.

[0118]

[0119] in,

[0120] R9, R 10 Each can be independently represented as an alkyl group with 1-10 carbon atoms, an alkenyl group with 2-10 carbon atoms, or an alkoxy group with 1-10 carbon atoms.

[0121] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula V-1 is selected from the group consisting of compounds represented by formulas V-1-1 to V-1-7.

[0122]

[0123] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula V-2 is selected from the group consisting of compounds represented by formulas V-2-1 to V-2-10.

[0124]

[0125] Preferably, the liquid crystal composition of the present invention further comprises one or more compounds of formula VI.

[0126]

[0127] in,

[0128] R 11 R 12 Each independently represents an alkyl group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkoxy group having 1-10 carbon atoms, and R 11 R 12 Either -CH2- can be optionally replaced by a cyclopropyl or cyclopentyl group;

[0129] X represents O or -CH2O-.

[0130] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula VI is selected from the group consisting of compounds represented by formulas VI-1 to VI-2 below.

[0131]

[0132] in,

[0133] R 11 R 12Each independently represents an alkyl group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkoxy group having 1-10 carbon atoms, and R 11 R 12 Either -CH2- in the group may be optionally replaced by a cyclopropyl or cyclopentyl group.

[0134] The liquid crystal composition of the present invention preferably comprises one or more compounds of formula VI-2; more preferably, the mass content of the compound of formula VI-2 is 2-17%; and even more preferably, the mass content of the compound of formula VI-2 is 5-13%.

[0135] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula VI-1 is selected from the group consisting of compounds represented by formulas VI-1-1 to VI-1-6.

[0136]

[0137] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula VI-2 is selected from the group consisting of compounds represented by formulas VI-2-1 to VI-2-8.

[0138]

[0139]

[0140] Preferably, the liquid crystal composition of the present invention further comprises one or more compounds represented by formula VII.

[0141]

[0142] in,

[0143] R 13 R 14 Each can be independently represented as an alkyl group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkoxy group having 1-10 carbon atoms.

[0144] Preferably, in the liquid crystal composition of the present invention, the compound represented by formula VII is selected from the group consisting of compounds represented by formulas VII-1 to VII-19 below.

[0145]

[0146]

[0147] Preferably, the liquid crystal composition of the present invention further comprises one or more polymerizable compounds.

[0148] The liquid crystal composition of the present application, preferably, the aforementioned polymerizable compound is selected from the group consisting of compounds represented by the following formulae RM-1 to RM-8,

[0149]

[0150]

[0151] The liquid crystal composition of the present application, preferably, the aforementioned polymerizable compound comprises a compound represented by formula RM-1, further preferably, the mass content of RM-1 is added in an amount of 0.01 to 0.5% based on the total mass content of 100% of the liquid crystal composition.

[0152] The liquid crystal composition of the present application, preferably, various functional dopants can be added to the aforementioned liquid crystal compound.

[0153] The liquid crystal composition of the present application, preferably, the aforementioned dopants are mainly antioxidants, ultraviolet absorbers, chiral agents, etc.

[0154] Antioxidants can be listed as follows,

[0155]

[0156] wherein t represents an integer of 1 to 10.

[0157] Ultraviolet absorbers can be listed as follows,

[0158]

[0159] Chiral agents (left-handed or right-handed) can be preferably listed as follows, for example:

[0160]

[0161] The liquid crystal composition of the present application, preferably, the mass percentage content of the aforementioned dopants is preferably between 0.01 and 1%.

[0162] [liquid crystal display element or liquid crystal display]

[0163] The present application also relates to a liquid crystal display element or a liquid crystal display comprising any one of the aforementioned liquid crystal compositions; the display element or display is an active matrix display element or display.

[0164] The aforementioned active matrix display element or display can be specifically listed as follows, for example, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display element or other TFT display, especially suitable for IPS-TFT mode liquid crystal display element or liquid crystal display.

[0165] The liquid crystal display element or the liquid crystal display of the present application comprises the liquid crystal composition disclosed in the present application, and can be applied in the field of television and the like.

[0166] Examples

[0167] In order to more clearly illustrate the present application, the present application will be further described below in combination with preferred examples. It should be understood by those skilled in the art that the specific description below is illustrative rather than limiting, and should not limit the protection scope of the present application.

[0168] In the present application, the preparation method is a conventional method unless otherwise specified, the raw materials used are available from the public commercial channels unless otherwise specified, the percentages are mass percentages, the temperature is in Celsius (℃), and the specific meanings of other symbols and test conditions are as follows:

[0169] Tni represents the liquid crystal clearing point (℃), which is tested by DSC quantification method;

[0170] Δn represents the optical anisotropy, Δn = n e -n o , wherein n o is the refractive index of ordinary light, n e is the refractive index of non-ordinary light, the test conditions are 25±2℃ and 60±2℃, 589nm, and Abbe refractometer test;

[0171] Δε represents the dielectric anisotropy, Δε = ε ∥ -ε ⊥ , wherein ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, the test conditions are 25±0.5℃, 20 microns of antiparallel box, and INSTEC:ALCT-IR1 test;

[0172] γ1 represents the rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 microns of vertical box, and INSTEC:ALCT-IR1 test;

[0173] K 11 is the splay elastic constant, K 33 is the bend elastic constant, the test conditions are 25℃, INSTEC:ALCT-IR1, and 20 microns of antiparallel box;

[0174] VHR represents the voltage holding ratio (%), the test conditions are 60±2℃, the voltage is ±5V, the pulse width is 10ms, and the voltage holding time is 16.7ms. The test equipment is TOYO Model 6254 liquid crystal performance comprehensive tester;

[0175] Low temperature observation condition: 1g liquid crystal is poured into 5ml clean glass vial, sealed and put into-30 DEG C and-40 DEG C low temperature refrigerator, and observed for 960 hours, and whether crystal precipitates is observed every 24 hours;

[0176] Afterimage: the afterimage of the liquid crystal display device is the level of the remaining inherent pattern after 1000 hours of displaying a specified fixed pattern in the display area, which is evaluated by visual observation of the full screen uniform display as follows in 4 grades:

[0177] No residual

[0178] There is a very small amount of residual, which is an acceptable level

[0179] There is residual, which is an unacceptable level

[0180] There is residual, which is very poor.

[0181] The preparation method of the liquid crystal composition is as follows: each liquid crystal monomer is weighed according to a certain ratio and then put into a stainless steel beaker, the stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirring instrument for heating and melting, after most of the liquid crystal monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, the mixture is stirred uniformly, and the liquid crystal composition is obtained after cooling to room temperature.

[0182] The liquid crystal monomer structure of the embodiment of the application is represented by codes, and the code representation methods of the liquid crystal ring structure, end group and linking group are shown in Table 1 and Table 2.

[0183] Table 1 corresponding code of ring structure

[0184]

[0185] Table 2 corresponding code of end group and linking group

[0186]

[0187]

[0188] For example:

[0189] The code is CCWY-3-O2; The code is CC-Cp-V1;

[0190] The code is CPY-2-O2;

[0191] The code is CCY-3-O2;

[0192] The code is LY-3-O2;

[0193] Code: PGY-3-O2; Code: Sb-CpO-O4;

[0194] Code: Sc-CpO-O4;

[0195] Code: PGP-Cpr1-2; Code: B-2O-O4;

[0196] Code: B-CpO-O4;

[0197] Code: CY-3-O2;

[0198] Code: PP-1-2V;

[0199] Code: PGP-5-2;

[0200] Code: CPU-3-O2;

[0201] Code: CPU-5-O3;

[0202] Code: CPU-3-F.

[0203] The present application is illustrated by the following specific examples:

[0204] Example

[0205] Example 1

[0206] The formulations of the liquid crystal compositions and the corresponding properties are shown in Table 3 below.

[0207] Table 3 Formulations of the liquid crystal compositions of Example 1 and the corresponding properties

[0208]

[0209] Comparative Example 1

[0210] The formulations of the liquid crystal compositions and the corresponding properties are shown in Table 4 below.

[0211] Table 4 Formulations of the liquid crystal compositions of Comparative Example 1 and the corresponding properties

[0212]

[0213] Example 2

[0214] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 5 below.

[0215] Table 5 Formulations and corresponding properties of the liquid crystal compositions of Example 2

[0216]

[0217]

[0218] Comparative Example 2

[0219] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 6 below.

[0220] Table 6 Formulations and corresponding properties of the liquid crystal compositions of Comparative Example 2

[0221]

[0222] Example 3

[0223] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 7 below.

[0224] Table 7 Formulations and corresponding properties of the liquid crystal compositions of Example 3

[0225]

[0226]

[0227] Example 4

[0228] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 8 below.

[0229] Table 8 Formulations and corresponding properties of the liquid crystal compositions of Example 4

[0230]

[0231] Example 5

[0232] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 9 below.

[0233] Table 9 Formulations and corresponding properties of the liquid crystal compositions of Example 5

[0234]

[0235] Example 6

[0236] The formulations and corresponding properties of the liquid crystal compositions are shown in Table 10 below.

[0237] Table 10 Formulation and corresponding properties of liquid crystal compositions of Example 6

[0238]

[0239]

[0240] Example 7

[0241] The formulation and corresponding properties of the liquid crystal compositions are shown in Table 11 below.

[0242] Table 11 Formulation and corresponding properties of liquid crystal compositions of Example 7

[0243]

[0244] Example 8

[0245] The formulation and corresponding properties of the liquid crystal compositions are shown in Table 12 below.

[0246] Table 12 Formulation and corresponding properties of liquid crystal compositions of Example 8

[0247]

[0248]

[0249] Example 9

[0250] The formulation and corresponding properties of the liquid crystal compositions are shown in Table 13 below.

[0251] Table 13 Formulation and corresponding properties of liquid crystal compositions of Example 9

[0252]

[0253] Example 10

[0254] The formulation and corresponding properties of the liquid crystal compositions are shown in Table 14 below.

[0255] Table 14 Formulation and corresponding properties of liquid crystal compositions of Example 10

[0256]

[0257] The following comparative examples are based on Example 10. This example and comparative examples are only for illustration of the inventive concept and do not limit the present application. Other examples can be replaced by the comparative examples according to the present application and the corresponding technical effects can be achieved.

[0258] Comparative Example 3

[0259] The formulation and corresponding properties of the liquid crystal compositions are shown in Table 15 below.

[0260] Table 15 Formulation and corresponding properties of comparative example 3 liquid crystal composition

[0261]

[0262]

[0263] Comparative Example 4

[0264] The formulation and corresponding properties of the liquid crystal composition are shown in Table 16 below.

[0265] Table 16 Formulation and corresponding properties of comparative example 4 liquid crystal composition

[0266]

[0267] Comparative Example 5

[0268] The formulation and corresponding properties of the liquid crystal composition are shown in Table 17 below.

[0269] Table 17 Formulation and corresponding properties of comparative example 5 liquid crystal composition

[0270]

[0271]

[0272] Comparative Example 6

[0273] The formulation and corresponding properties of the liquid crystal composition are shown in Table 18 below.

[0274] Table 18 Formulation and corresponding properties of comparative example 6 liquid crystal composition

[0275]

[0276] Example 11

[0277] The formulation and corresponding properties of the liquid crystal composition are shown in Table 19 below.

[0278] Table 19 Formulation and corresponding properties of example 11 liquid crystal composition

[0279]

[0280]

[0281] Comparative Example 7

[0282] The formulation and corresponding properties of the liquid crystal composition are shown in Table 20 below.

[0283] Table 20 Formulation and corresponding properties of comparative example 7 liquid crystal composition

[0284]

[0285] Example 1-10, Comparative Example 1-7 were subjected to UV aging test and backlight aging test. There is a process of UV curing in the production process of liquid crystal panel, and UV light has a destructive effect on liquid crystal material. Therefore, the liquid crystal material should have certain anti-UV light and anti-long time light ability.

[0286] Before the UV and backlight aging test, the VHR data of the liquid crystal composition was measured as the initial VHR data, then the liquid crystal composition was subjected to UV and backlight aging test, and the VHR data of the liquid crystal composition was measured again after the test, the smaller the data change after the test, the stronger the anti-UV ability and the backlight aging ability of the liquid crystal composition.

[0287] UV aging test: the liquid crystal composition was filled into the test box and irradiated under the UV lamp with a wavelength of 365 nm for 5000 mJ energy.

[0288] Backlight aging test: the liquid crystal composition was filled into the test box and placed on the backlight plate for 1000 hours, and the backlight intensity was 15000 nit.

[0289] Afterimage test: irradiated on the backlight plate for 1000 hours.

[0290] Table 21 UV aging and backlight aging test data

[0291] VHR (% initial) VHR (% UV) VHR (% back light aging) Afterimage Example 1 96.9 96.1 95.3 ◎ Comparative Example 1 96.5 95.2 90.1 △ Example 2 96.5 95.8 94.1 ◎ Comparative Example 2 96.6 94.7 88.9 × Example 3 96.3 95.7 93.9 ◎ Example 4 96.5 95.3 93.7 ◎ Example 5 96.1 95.0 93.2 ◎ Example 6 95.9 94.9 93.0 ○ Example 7 96.2 95.7 94.1 ◎ Example 8 96.3 95.1 93.9 ◎ Example 9 95.8 95.0 94.7 ◎ Example 10 96.2 95.6 93.7 ◎ Comparative Example 3 96.1 95.1 88.5 × Comparative Example 4 96.3 94.3 88.3 × Comparative Example 5 95.7 93.8 85.5 × Comparative Example 6 96.3 95.2 90.7 △ Example 11 96.1 95.5 93.2 ○ Comparative Example 7 —— —— —— ——

[0292] From the above table 21, it can be seen that after the UV aging and backlight aging test, the examples still have a high VHR compared with the comparative examples, and do not have afterimage defects after long time backlight irradiation.

[0293] Therefore, the technical scheme provided by the present application has a suitable upper and lower limit range of working temperature, a suitable dielectric anisotropy, especially a larger optical anisotropy, a good mutual solubility, especially a very good low temperature stability at-30℃ and-40℃, and an excellent backlight aging performance; can be used to develop liquid crystal displays with faster response speed, especially can improve the afterimage phenomenon; the liquid crystal composition of the present application is especially suitable for 3D display technology.

[0294] Obviously, the above examples of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can be made, and it is impossible to enumerate all the embodiments here, and any changes or variations derived from the technical scheme of the present application still fall within the protection scope of the present application.

Claims

1. A liquid crystal composition, characterized by comprising The liquid crystal composition comprises one or more compounds represented by Formula I in an amount of 3 to 10% by mass, and one or more compounds represented by Formula II-2 in an amount of 5 to 20% by mass, and one or more compounds represented by Formula II-3 in an amount of 5 to 30% by mass, and one or more compounds represented by Formula II-4 in an amount of 5 to 10% by mass, and one compound represented by Formula IV-1-6, wherein, R1, R3 each independently represent an alkyl group having 1 to 10 carbon atoms; R2 represents an alkoxy group having 1 to 10 carbon atoms; and R4 represents an alkyl group or an alkoxy group having 1 to 10 carbon atoms.

2. The liquid crystal composition according to claim 1, characterized by The liquid crystal composition further comprises one or more compounds selected from the group consisting of Formulae II-1, II-5 to II-10, wherein, R3 represents an alkyl group having 1 to 10 carbon atoms; and R4 represents an alkyl group or an alkoxy group having 1 to 10 carbon atoms.

3. The liquid crystal composition according to claim 2, characterized by The compound represented by Formula II comprises one or more compounds represented by Formula II-4.

4. The liquid crystal composition according to any one of claims 1 to 3, characterized by The liquid crystal composition further comprises one or more compounds represented by Formula III, wherein, R5, R6 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and any -CH2- in R5, R6 is optionally substituted with a cyclopropylidene group or a cyclopentylidene group.

5. The liquid crystal composition according to claim 1, characterized by The liquid crystal composition further comprises one or more compounds represented by Formula V, wherein, R9, R 10 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; denotes 6. The liquid crystal composition according to claim 1, characterized by The liquid crystal composition further comprises one or more compounds represented by Formula VI, wherein, R 11 R 12 Each independently represents an alkyl group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkoxy group having 1-10 carbon atoms, and R 11 R 12 Either -CH2- can be optionally replaced by a cyclopropyl or cyclopentyl group; X represents O or -CH2O-.

7. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by Formula VII, wherein, R 13 , R 14 each independently represents an alkanyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

8. A liquid crystal display element or a liquid crystal display, characterized by comprising the liquid crystal display element according to claim 7. The liquid crystal display element comprises the liquid crystal composition according to any one of claims 1 to 7, and is an active matrix display element or a passive matrix display element.

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