Negative dielectric anisotropy liquid crystal composition containing phenanthrene derivative and benzochromene derivative

Abstract

The invention belongs to the technical field of liquid crystal materials, and particularly relates to a negative dielectric anisotropy liquid crystal composition containing a phenanthrene derivative and a benzochromene derivative 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 as shown in a formula I and one or more compounds as shown in a formula II. The liquid crystal composition provided by the invention has the characteristics of high dielectric anisotropy, low driving voltage and high and low frequency stability, and has relatively high response speed. The liquid crystal composition provided by the invention is suitable for the display fields of low-power-consumption televisions, notebook computers and mobile phones. # imgabs0 #

Description

Technical Field

[0001] The present invention relates to the field of liquid crystal display technology, and more specifically to a liquid crystal composition with negative dielectric anisotropy containing a phenanthrene derivative and a benzochromene derivative and its application in the field of liquid crystal display. Background Art

[0002] Since the birth of liquid crystal materials, liquid crystal materials have been widely used in the display field and deeply integrated with people's lives. Televisions, computers, smart phones, and smart cars are all inseparable from liquid crystal display devices. Even medical equipment, billboards, price tags, etc. are all application fields of liquid crystal materials. In order to meet people's increasing requirements for display effects, the performance of liquid crystal display devices has been continuously improved, and with it comes increased power consumption. At present, the mainstream products of TVs are 65 inches, the mainstream products of computer monitors are 24 to 27 inches, and the mainstream products of laptops are 16 to 17 inches. The larger the size, the more backlight. In addition, in order to obtain high contrast and high resolution, a brighter backlight is also required, which requires more power to achieve.

[0003] At present, the global energy shortage and the concept of carbon neutrality have penetrated into various industries. The requirements for energy consumption of display panels are getting higher and higher, especially with the proposal of the new energy consumption standard ES9.0 in 2022, more and more products with low power consumption as the research and development direction are being developed. The ES9.0 energy standard is based on performance. The specification requires the use of the ANSI / CTA-2037-C test method, and encourages the use of high-efficiency components (such as LEDs, films, power supplies) and energy efficiency characteristics (such as low-voltage drive, local dimming, etc.) to promote more energy-saving product design. As a field where electric energy is widely used, it is imperative to reduce energy consumption in the display field. The most direct way to reduce energy consumption is to reduce the driving voltage of the display device. The reduction of driving voltage can directly reduce the consumption of electric energy. In addition, the purpose of reducing energy consumption can be achieved by increasing the transmittance and improving the efficiency of backlight use, thereby reducing the energy consumption of backlight. The energy consumption of display devices can also be reduced by frequency conversion technology, which requires liquid crystal materials to be able to display stably at both high and low frequencies. The lower the refresh rate (Hz), the more power-saving the display element. Therefore, if the display (such as a laptop or desktop display) does not need to display a fast refresh image, such as some static images, a low refresh rate can save power.

[0004] TFT-LCD uses voltage changes to control the strength of the electric field in the liquid crystal box and change the arrangement direction of the liquid crystal molecules, thereby achieving control over whether light is transmitted or not. However, when the liquid crystal display displays the picture, the picture often "flickers, flickers", which is called "Flicker". People observe the Flicker phenomenon when the liquid crystal display is displayed because the brightness (grayscale) of the two displayed pictures before and after is inconsistent, and the different brightness is due to the different light transmittance of the liquid crystal box. If the light transmittance does not change, the liquid crystal molecules must not shake back and forth under the action of the electric field. If the voltage is applied at a high frequency (such as 60Hz), the liquid crystal can be quickly replenished when the voltage is consumed, so the liquid crystal molecules shake very little, and the Flicker performance is not obvious; but at a low frequency (such as 20Hz), the liquid crystal charging time interval is lengthened, the liquid crystal molecules shake more, and the Flicker performance becomes obvious. Therefore, in order to maintain a stable display effect, the liquid crystal material is required to have a higher voltage holding rate (VHR) and a better flexoelectric effect (Flexo).

[0005] Therefore, developing a liquid crystal composition with low driving voltage and high and low frequency stability is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve one or more of the above technical defects, the present invention provides a negative dielectric anisotropy liquid crystal composition containing a phenanthrene derivative and a benzochromene derivative, which has high dielectric anisotropy, low driving voltage, high and low frequency stability, and has a faster response speed. The liquid crystal composition provided by the present invention is suitable for low-power television, laptop computer, and mobile phone display fields.

[0007] In order to achieve the above-mentioned beneficial technical effects, the present invention provides a liquid crystal composition comprising one or more compounds of formula I and one or more compounds of formula II.

[0008]

[0009] wherein R1 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms;

[0010] R3 and R4 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, and any -CH2- in R3 and R4 is optionally substituted by a cyclopropylene group or a cyclopentylene group.

[0011] The second object of the present invention is to provide a liquid crystal display element / liquid crystal display, which is mainly an active matrix display mode.

[0012] Effects of the Invention

[0013] The technical solution provided by the present invention has the characteristics of high dielectric anisotropy, low driving voltage, high and low frequency stability, and fast response speed. The liquid crystal composition provided by the present invention is suitable for the fields of low-power television, notebook computer, and mobile phone display. DETAILED DESCRIPTION

[0014] The present invention provides a liquid crystal composition, which comprises one or more compounds represented by formula I and one or more compounds represented by formula II.

[0015]

[0016] wherein R1 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms;

[0017] R3 and R4 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, and any -CH2- in R3 and R4 is optionally substituted by a cyclopropylene group or a cyclopentylene group.

[0018] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula I is selected from the group consisting of compounds represented by the following formulas I-1 to I-40,

[0019]

[0020]

[0021] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula I is 5-15%, and more preferably, the mass content of the compound represented by the aforementioned formula I is 7-12%.

[0022] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula II is selected from the group consisting of compounds represented by the following formula II-1 to formula II-16,

[0023]

[0024]

[0025] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula II is 1-10%; further preferably, the mass content of the compound represented by the aforementioned formula II is 3-8%.

[0026] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula III,

[0027]

[0028] Here, R5 and R6 each independently represent 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.

[0029] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula III is selected from the group consisting of compounds represented by the following formula III-1 to formula III-12,

[0030]

[0031] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula III is greater than 20%; further preferably, the mass content of the compound represented by the aforementioned formula III is 28-45%.

[0032] The liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula III, contains at least formula III-6; further preferably, the mass content of the formula III-6 is ≥30%.

[0033] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula IV,

[0034]

[0035] in,

[0036] R7 and R8 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;

[0037] express express

[0038] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV is selected from the group consisting of compounds represented by the following formulas IV-1 to IV-4,

[0039]

[0040] Here, R7 and R8 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.

[0041] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-1 is selected from the group consisting of compounds represented by the following formulas IV-1-1 to IV-1-7,

[0042]

[0043]

[0044] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-2 is selected from the group consisting of compounds represented by the following formulas IV-2-1 to IV-2-10,

[0045]

[0046] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-3 is selected from the group consisting of compounds represented by the following formulas IV-3-1 to IV-3-19,

[0047]

[0048]

[0049] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-4 is selected from the group consisting of compounds represented by the following formulas IV-4-1 to IV-4-10,

[0050]

[0051] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV is selected from formula IV-1 and formula IV-2, and its mass content is 1-15% or more; more preferably, its mass content is 2-14%.

[0052] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula V,

[0053]

[0054] Among them, 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;

[0055] Z represents -CH2CH2-, -CH2O-, -CH=CH- or a single bond;

[0056] express

[0057] m represents 0, 1 or 2, and when m represents 2, the two Can be the same or different, and both Not at the same time

[0058] n represents 0 or 1, and m+n<3.

[0059] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V is selected from the group consisting of compounds represented by the following formulas V-1 to V-9,

[0060]

[0061] Among them, 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.

[0062] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V is selected from the compounds represented by formula V-2 to formula V-5; further preferably, the mass content of the compound represented by the aforementioned formula V is 20-60%; further preferably, the mass content of the compound represented by the aforementioned formula V is 34-50%.

[0063] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-1 is selected from the group consisting of compounds represented by the following formulas V-1-1 to V-1-9,

[0064]

[0065]

[0066] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-2 is selected from the group consisting of the compounds represented by the following formulas V-2-1 to V-2-8,

[0067]

[0068] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-3 is selected from the group consisting of compounds represented by the following formulas V-3-1 to V-3-16,

[0069]

[0070]

[0071] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-4 is selected from the group consisting of compounds represented by the following formulas V-4-1 to V-4-16,

[0072]

[0073] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-5 is selected from the group consisting of compounds represented by the following formulas V-5-1 to V-5-15,

[0074]

[0075]

[0076] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-6 is selected from the group consisting of compounds represented by formula V-6-1 to formula V-6-11,

[0077]

[0078] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-7 is selected from the group consisting of compounds represented by formula V-7-1 to formula V-7-12,

[0079]

[0080] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-8 is selected from the group consisting of compounds represented by formula V-8-1 to formula V-8-11,

[0081]

[0082] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-9 is selected from the group consisting of compounds represented by formula V-9-1 to formula V-9-7,

[0083]

[0084]

[0085] In the liquid crystal composition of the present invention, preferably, the sum of the mass contents of the compounds represented by the aforementioned formula I, formula II, and formula V is greater than 50%.

[0086] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VI,

[0087]

[0088] Among them, R 11 , R 12 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, and R11 , R 12 Any -CH2- in is optionally substituted by cyclopropylene or cyclopentylene;

[0089] X represents O or S.

[0090] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by the following formulas VI-1 to VI-24,

[0091]

[0092]

[0093] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula VI is 1-10%; further preferably, the mass content of the compound represented by the aforementioned formula VI is 3-6%.

[0094] The liquid crystal composition of the present invention, preferably, further comprises one or more polymerizable compounds.

[0095] In the liquid crystal composition of the present invention, preferably, the polymerizable compound is selected from the group consisting of compounds represented by the following formulae RM-1 to RM-8:

[0096]

[0097]

[0098] In the liquid crystal composition of the present invention, preferably, the aforementioned polymerizable compound comprises a compound represented by formula RM-1. Further preferably, RM-1 is added on the basis of 100% of the total mass content of the liquid crystal composition, and the added amount is 0.01-0.5%.

[0099] In the liquid crystal composition of the present invention, preferably, dopants with various functions may be added to the aforementioned liquid crystal compound.

[0100] In the liquid crystal composition of the present invention, preferably, the aforementioned dopant is mainly an antioxidant, an ultraviolet absorber, a chiral agent, and the like.

[0101] Antioxidants include,

[0102]

[0103] Here, t represents an integer from 1 to 10.

[0104] Examples of the ultraviolet absorber include:

[0105]

[0106] Preferred chiral agents (levorotatory or dextrorotatory) include, for example:

[0107]

[0108] In the liquid crystal composition of the present invention, preferably, the mass content of the aforementioned dopant is added on the basis of 100% of the total mass content of the liquid crystal composition, and the added amount is preferably between 0.01-1%.

[0109] [Liquid crystal display element or liquid crystal display]

[0110] The present invention also relates to a liquid crystal display element or a liquid crystal display comprising any one of the above liquid crystal compositions; the display element or the display is an active matrix display element or the display.

[0111] The aforementioned active matrix display element or display can specifically include, for example, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display elements or other TFT displays, and is particularly suitable for VA-TFT mode liquid crystal display elements or liquid crystal displays.

[0112] The liquid crystal display element or liquid crystal display of the present invention comprises the liquid crystal composition disclosed in the present invention and can be applied to the fields of television, notebook computer, mobile phone, etc.

[0113] Example

[0114] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0115] In the present invention, the preparation methods are conventional methods unless otherwise specified, the raw materials used are all available from public commercial channels unless otherwise specified, the percentages are all mass percentages, the temperatures are in degrees Celsius (°C), and the specific meanings of other symbols and test conditions are as follows:

[0116] Tni represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

[0117] Δn represents optical anisotropy, Δn = n e -n o , where n o is the refractive index of ordinary light, n e It is the refractive index of extraordinary light, tested under two conditions: 25±2℃ and 60±2℃, 589nm, and Abbe refractometer.

[0118] Δε represents dielectric anisotropy, Δε=ε ∥ -ε ⊥ , where 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 μm antiparallel box, INSTEC:ALCT-IR1 test;

[0119] γ1 represents rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 μm vertical box, INSTEC: ALCT-IR1 test;

[0120] K 11 is the splay elastic constant, K 33 is the bending elastic constant, the test conditions are: 25 °C, INSTEC:ALCT-IR1, 20 μm antiparallel box;

[0121] VHR stands for voltage holding ratio (%), and the test conditions are 60±2℃, voltage ±1V, pulse width 10ms, and voltage holding time 16.7ms. The test equipment is TOYO Model 6254 LCD performance comprehensive tester;

[0122] Flicker test, the test equipment is DMS 505, the test voltage is 127 grayscale voltage, the output is square wave, and the test frequency is 40Hz and 60Hz.

[0123] The unit of flicker test data is dB, which is the data of the change of transmittance over time converted into the change of transmittance with frequency through fast Fourier transform (FFT). The smaller the dB value, the better the flicker of the LCD, and the smaller the brightness difference of the display panel when the frequency changes.

[0124] The preparation method of the liquid crystal composition is as follows: each liquid crystal monomer is weighed according to a certain ratio and put into a stainless steel beaker, and the stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirring instrument to heat and melt. After most of the liquid crystal monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, and the mixture is stirred evenly. After cooling to room temperature, the liquid crystal composition is obtained.

[0125] The liquid crystal monomer structure of the embodiment of the present invention is represented by a code, and the code representation method of the liquid crystal ring structure, end group, and connecting group is shown in Table 1 and Table 2 below.

[0126] Table 1 Corresponding codes of ring structure

[0127]

[0128] Table 2 Corresponding codes of terminal groups and linking groups

[0129]

[0130]

[0131] Example:

[0132] Its code is CC-Cp-V1;

[0133] Its code is CPY-2-O2; Its code is CCY-3-O2; Its code is LY-3-O2;

[0134] Its code is Sb-CpO-O4; Its code is Sc-CpO-O4;

[0135] Its code is B-2O-O4;

[0136] Its code is B-CpO-O4;

[0137] Its code is CY-3-O2;

[0138] Its code is PP-1-2V;

[0139] Its code is PGP-5-2;

[0140] The present invention is described below using the following specific embodiments:

[0141] Example

[0142] Example 1

[0143] Table 3 Formulation of the liquid crystal composition of Example 1 and corresponding properties

[0144]

[0145]

[0146] Example 2

[0147] The formula of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0148] Table 4 Formulation of the liquid crystal composition of Example 2 and corresponding properties

[0149]

[0150] Example 3

[0151] The formula of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0152] Table 5 Formulation of the liquid crystal composition of Example 3 and corresponding properties

[0153]

[0154]

[0155] Example 4

[0156] The formula of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0157] Table 6 Formulation of the liquid crystal composition of Example 4 and corresponding properties

[0158]

[0159] Example 5

[0160] The formula of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0161] Table 7 Formulation of the liquid crystal composition of Example 5 and corresponding properties

[0162]

[0163] Example 6

[0164] The formula of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0165] Table 8 Formulation and corresponding properties of the liquid crystal composition of Example 6

[0166]

[0167]

[0168] Example 7

[0169] The formula of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0170] Table 9 Formulation of the liquid crystal composition of Example 7 and corresponding properties

[0171]

[0172] Example 8

[0173] The formula of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0174] Table 10 Formulation of the liquid crystal composition of Example 8 and corresponding properties

[0175]

[0176]

[0177] Example 9

[0178] The formula of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0179] Table 11 Formulation of liquid crystal composition of Example 9 and corresponding properties

[0180]

[0181]

[0182] Example 10

[0183] The formula of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0184] Table 12 Formulation and corresponding properties of the liquid crystal composition of Example 10

[0185]

[0186] Comparative Example 1

[0187] The formula of the liquid crystal composition and the corresponding properties are shown in Table 13 below.

[0188] Table 13 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 1

[0189]

[0190] Comparative Example 2

[0191] The formula of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0192] Table 14 Formula and corresponding properties of liquid crystal composition of comparative example 2

[0193]

[0194]

[0195] Comparative Example 3

[0196] The formula of the liquid crystal composition and the corresponding properties are shown in Table 15 below.

[0197] Table 15 Formulation and corresponding properties of liquid crystal composition of comparative example 3

[0198]

[0199] Table 16 Driving voltage, VHR, Flicker test data of embodiment and comparative example

[0200]

[0201]

[0202] It can be seen from the above Table 16 that the liquid crystal composition provided by Examples 1-10 of the present invention has a lower driving voltage relative to Comparative Examples 1-3, and its driving voltage is all below 5.0V. The driving voltage of Examples 3 and 4 can even reach 3.5V, which can greatly reduce the energy consumption of the display device. In particular, when used in mobile devices such as laptops and mobile phones, the battery life can be greatly extended. In addition, the liquid crystal composition provided by Examples 1-10 has good Flicker performance. It can be seen that Examples 1-10 have a lower dB value, which can reach below -50dB at a high frequency of 60Hz, and can also reach below -45dB at a low frequency of 40Hz. The Flicker performance of Comparative Examples 1-3 is obviously worse, and its dB value is significantly higher than that of the embodiment, and is around -40dB at a high frequency of 60Hz and a low frequency of 40Hz. Therefore, the liquid crystal composition provided by Examples 1-10 has better Flicker performance.

[0203] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A liquid crystal composition with negative dielectric anisotropy containing a phenanthrene derivative and a benzochromene derivative, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula I and one or more compounds represented by formula II. in, R1 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms; R3 and R4 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, and any -CH2- in R3 and R4 is optionally substituted by a cyclopropylene group or a cyclopentylene group.

2. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula III, in, R5 and R6 each independently represent 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.

3. The liquid crystal composition according to claim 2, characterized in that: The mass content of the compound represented by formula III in the liquid crystal composition is greater than or equal to 20%.

4. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula IV, in, R7 and R8 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; express express 5. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula V, in, 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; Z represents -CH2CH2-, -CH2O-, -CH=CH- or a single bond; express m represents 0, 1 or 2, and when m represents 2, the two Can be the same or different, and both Not at the same time n represents 0 or 1, and m+n<3.

6. The liquid crystal composition according to claim 5, characterized in that: The sum of the mass contents of the compounds represented by Formula I, Formula II and Formula V in the liquid crystal composition is greater than or equal to 50%.

7. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VI, in, R 11 , R 12 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, and R 11 , R 12 Any -CH2- in is optionally substituted by cyclopropylene or cyclopentylene; X represents O or S.

8. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition comprises at least two compounds represented by formula I.

9. A liquid crystal display element or a liquid crystal display, characterized in that: The liquid crystal display device comprises the liquid crystal composition according to any one of claims 1 to 8, wherein the liquid crystal display device is an active matrix display device or a passive matrix display device.

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