Negative dielectric anisotropy liquid crystal composition containing phenanthrene derivative and application thereof

Abstract

The invention 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 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 advantages of very high response speed, relatively high optical anisotropy, relatively high transmittance, proper working temperature range and proper dielectric anisotropy; the liquid crystal display can be used for developing high-response-speed and high-contrast liquid crystal displays; the liquid crystal composition is especially suitable for the technical field of electronic competitive display. # 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 its application in the field of liquid crystal display. Background Art

[0002] Liquid crystal material is a mixture that has both the fluidity of liquid and the anisotropy of crystal at a certain temperature. According to the different properties of liquid crystal materials, most of the liquid crystal materials in various phases have been developed for use in liquid crystal display devices. Display is the process of converting data information with electrical signals as the transmission medium into visual information with visible light as the transmission medium. The device that completes the display is the man-machine interface Man-Machine Interface, MMI. Flat panel display Flat panel display, FPD is the most popular type of display device at present. Liquid crystal display Liquid crystal display, LCD is the earliest developed and commercialized product in FPD. In terms of working principle, LCD, a display device, uses polarizers and liquid crystal molecules in liquid crystal boxes to generate light and darkness corresponding to the image to be displayed, thereby changing the color, thereby realizing a recognizable image display. In other words, the brightness of LCD is determined by many factors such as the relative amount of light passing through the liquid crystal box, the relative amount of light passing through the color filter (CF), and the brightness of the backlight.

[0003] In recent years, e-sports, as an emerging sport, has gradually attracted widespread attention. Unlike traditional sports, e-sports needs to be carried out in a virtual environment created by electronic information equipment. The display of the virtual environment requires the help of display technology and display equipment. With the continuous development of e-sports projects, the requirements for the presentation of virtual environments are also constantly increasing, requiring display devices to be able to meet the requirements of fast screen switching, with a wide color gamut, high resolution, and high contrast. Among them, the most important thing is how to increase the switching speed of the screen.

[0004] The response time is usually measured in milliseconds (ms), which refers to the speed at which the LCD monitor responds to the input signal, that is, the time it takes for the liquid crystal particles to change from dark to bright or from bright to dark. It corresponds to the "rise time" and "fall time" parts, and the response time usually mentioned refers to the sum of the two. For e-sports players, a 5ms or faster display is a better choice, corresponding to a response time of about 20ms for the liquid crystal material. The refresh rate of displays suitable for e-sports is constantly increasing to obtain higher display effects. For example, 165Hz, 240Hz, and even higher refresh rates. This type of high refresh rate display requires the liquid crystal material used to have a faster response speed to match the high refresh rate.

[0005] Contrast is also one of the main factors that affect the display effect of display devices. The so-called contrast refers to the ratio of the bright area to the dark area in the display screen of the display. For monochrome display, the higher the contrast, the clearer the display, and for color display, the higher the contrast, the brighter and more realistic the image. There are two main types of contrast parameters, one is the typical value and the other is the maximum value. The maximum value is often an instantaneous value and is not representative. The typical value is more valuable for reference. At present, the contrast of mainstream LCD monitors is generally at the level of 1000:1 to 1500:1, and the good ones can reach 2000:1 or even higher. If the contrast of the display device is too low, it will be difficult to see the displayed content clearly.

[0006] As is known to all, positive dielectric anisotropic liquid crystal compositions and negative dielectric anisotropic liquid crystal compositions each have their own advantages and disadvantages. Compared with negative compositions, positive compositions have the advantage of fast response speed, but the transmittance to light is low. Therefore, most of the current displays suitable for e-sports use positive compositions to meet the needs of high refresh rates. In order to further improve the response speed of liquid crystal displays, a commonly used method is to reduce the box thickness. When the delay amount (Δnd) of the liquid crystal display is designed to remain unchanged, reducing the box thickness will inevitably lead to an increase in the refractive index requirements of the liquid crystal composition. At present, liquid crystal displays of positive compositions improve response speed by sacrificing transmittance. However, a reduction in transmittance will lead to problems such as reduced display contrast, reduced screen brightness, and increased power consumption. The emergence of these problems is contrary to the current development direction of display device performance.

[0007] Therefore, it is an urgent problem to utilize the advantages of high transmittance of negative dielectric anisotropy liquid crystal compositions to improve their response speed, thereby obtaining a liquid crystal composition suitable for e-sports display devices. Summary of the invention

[0008] In order to solve one or more of the technical defects mentioned above, the present invention provides a technical solution, which has a very fast response speed, a large optical anisotropy, a high transmittance, a suitable operating temperature range, and a suitable dielectric anisotropy; it can be used to develop liquid crystal displays with fast response speed and high contrast; the liquid crystal composition of the present invention is particularly suitable for the field of e-sports display technology.

[0009] 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.

[0010]

[0011] Among them, R 1 , R 2Each 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;

[0012] R 3 , R 4 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.

[0013] 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.

[0014] Effects of the Invention

[0015] The technical solution provided by the present invention has a very fast response speed, a large optical anisotropy, a high transmittance, a suitable operating temperature range, and a suitable dielectric anisotropy; it can be used to develop a liquid crystal display with a fast response speed and a high contrast ratio; the liquid crystal composition of the present invention is particularly suitable for the field of e-sports display technology. DETAILED DESCRIPTION

[0016] 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.

[0017]

[0018] Among them, R 1 , R 2 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms;

[0019] R 3 , R 4 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.

[0020] 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,

[0021]

[0022]

[0023] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula I is 1-15%, and more preferably, the mass content of the compound represented by the aforementioned formula I is 3-11%.

[0024] 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 formulas II-1 to II-12,

[0025]

[0026] 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 4-9%.

[0027] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula III,

[0028]

[0029] Among them, R 5 , R 6 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.

[0030] 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 formulae III-1 to III-12,

[0031]

[0032]

[0033] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula III is 25-35%; further preferably, the mass content of the compound represented by the aforementioned formula III is 26.5-34%.

[0034] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula IV,

[0035]

[0036] Among them, R 7 , R 8 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;

[0037]

[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 the compounds represented by the following formulas IV-1 to IV-2,

[0039]

[0040] Among them, R 7 , R 8 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.

[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 formulae IV-1-1 to IV-1-7,

[0042]

[0043]

[0044] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula IV is 1-5%; further preferably, the mass content of the compound represented by the aforementioned formula IV is 2-4%.

[0045] 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 formulae IV-2-1 to IV-2-10,

[0046]

[0047] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula V,

[0048]

[0049] Among them, R 9 , 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;

[0050] Z stands for -CH 2 CH 2 -、-CH 2 O-, -CH=CH- or a single bond;

[0051] express

[0052] m represents 1 or 2, and when m represents 2, the two Can be the same or different.

[0053] 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-8,

[0054]

[0055]

[0056] Among them, R 9 , 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.

[0057] 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,

[0058]

[0059] 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-2-10,

[0060]

[0061]

[0062] 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-3-15,

[0063]

[0064] 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,

[0065]

[0066]

[0067] 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 formulas V-5-1 to V-5-11,

[0068]

[0069] 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 formulas V-6-1 to V-6-12,

[0070]

[0071] 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 formulas V-7-1 to V-7-11,

[0072]

[0073] 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 formulas V-8-1 to V-8-7,

[0074]

[0075] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula V is 5-30%; further preferably, the mass content of the compound represented by the aforementioned formula V is 9-24.5%.

[0076] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VI,

[0077]

[0078] 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, or an alkoxy group having 1 to 10 carbon atoms.

[0079] 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 formulae VI-1 to VI-16,

[0080]

[0081] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula VI is 15-25%; further preferably, the mass content of the compound represented by the aforementioned formula VI is 17-21%.

[0082] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VII,

[0083]

[0084] Among them, R 13 , R 14 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.

[0085] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII is selected from the group consisting of compounds represented by the following formulae VII-1 to VII-6,

[0086]

[0087] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the above formula VII is 1-10%.

[0088] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VIII,

[0089]

[0090] Among them, R 15 , R 16 Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms.

[0091] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII is selected from the group consisting of compounds represented by the following formulas VIII-1 to VIII-4,

[0092]

[0093] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula VIII is 1-5%; further preferably, the mass content of the compound represented by formula VIII is 2-5%.

[0094] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula IX,

[0095]

[0096] Among them, R 17 , R 18 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.

[0097] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX is selected from the group consisting of compounds represented by the following formulas IX-1 to IX-12,

[0098]

[0099]

[0100] In the liquid crystal composition of the present invention, preferably, the mass content of the compound represented by the aforementioned formula IX is 5-25%; further preferably, the mass content of the compound represented by the aforementioned formula IX is 9-19%.

[0101] The liquid crystal composition of the present invention preferably has an optical anisotropy of 0.130 to 0.135.

[0102] The liquid crystal composition of the present invention, preferably, further comprises one or more polymerizable compounds.

[0103] 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:

[0104]

[0105] In the liquid crystal composition of the present invention, preferably, the aforementioned polymerizable compound comprises a compound represented by formula RM-1. Further preferably, the compound represented by formula 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%.

[0106] In the liquid crystal composition of the present invention, preferably, dopants with various functions may be added to the aforementioned liquid crystal compound.

[0107] 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.

[0108] Antioxidants include,

[0109]

[0110] Here, t represents an integer from 1 to 10.

[0111] Examples of the ultraviolet absorber include:

[0112]

[0113] Preferred chiral agents (levorotatory or dextrorotatory) include, for example:

[0114]

[0115] In the liquid crystal composition of the present invention, preferably, the mass percentage content of the aforementioned dopant is preferably between 0.01-1%.

[0116] [Liquid crystal display element or liquid crystal display]

[0117] 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.

[0118] 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.

[0119] 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 fields such as electronic sports display equipment.

[0120] Example

[0121] 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.

[0122] 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:

[0123] Tni represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

[0124] 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.

[0125] 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;

[0126] γ 1 It represents the rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 micron vertical box, INSTEC: ALCT-IR1 test;

[0127] 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;

[0128] VHR stands for voltage holding ratio (%), and the test conditions are 60±2℃, voltage ±5V, pulse width 10ms, and voltage holding time 16.7ms. The test equipment is TOYO Model 6254 LCD performance comprehensive tester;

[0129] Tr transmittance, the test condition is 25±2℃, the test equipment is DMS 505;

[0130] RT response time, the test condition is 25±2℃, the test equipment is DMS 505.

[0131] 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.

[0132] 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.

[0133] Table 1 Corresponding codes of ring structure

[0134]

[0135]

[0136] Table 2 Corresponding codes of terminal groups and linking groups

[0137]

[0138]

[0139] Example:

[0140] Its code is CC-Cp-V1;

[0141] Its code is CPY-2-O2; Its code is CCY-3-O2; Its code is LY-3-O2;

[0142] Its code is Sb-CpO-O4; Its code is Sc-CpO-O4; Its code is B-2O-O4;

[0143] Its code is B-CpO-O4; Its code is CY-3-O2;

[0144] Its code is PP-1-2V;

[0145] The present invention is described below using the following specific embodiments:

[0146] Example

[0147] Example 1

[0148] The formula of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0149] Table 3 Formulation of the liquid crystal composition of Example 1 and corresponding properties

[0150]

[0151] Example 2

[0152] The formula of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0153] Table 4 Formulation of the liquid crystal composition of Example 2 and corresponding properties

[0154]

[0155]

[0156] Example 3

[0157] The formula of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0158] Table 5 Formulation of the liquid crystal composition of Example 3 and corresponding properties

[0159]

[0160]

[0161] Example 4

[0162] The formula of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0163] Table 6 Formulation of the liquid crystal composition of Example 4 and corresponding properties

[0164]

[0165] Example 5

[0166] The formula of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0167] Table 7 Formulation of the liquid crystal composition of Example 5 and corresponding properties

[0168]

[0169]

[0170] Example 6

[0171] The formula of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0172] Table 8 Formulation and corresponding properties of the liquid crystal composition of Example 6

[0173]

[0174]

[0175] Example 7

[0176] The formula of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0177] Table 9 Formulation of the liquid crystal composition of Example 7 and corresponding properties

[0178]

[0179] Example 8

[0180] The formula of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0181] Table 10 Formulation of the liquid crystal composition of Example 8 and corresponding properties

[0182]

[0183]

[0184] Example 9

[0185] The formula of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0186] Table 11 Formulation of liquid crystal composition of Example 9 and corresponding properties

[0187]

[0188] Example 10

[0189] The formula of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0190] Table 12 Formulation and corresponding properties of the liquid crystal composition of Example 10

[0191]

[0192] Comparative Example 1

[0193] The formula of the liquid crystal composition and the corresponding properties are shown in Table 13 below.

[0194] Table 13 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 1

[0195]

[0196]

[0197] Comparative Example 2

[0198] The formula of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0199] Table 14 Formula and corresponding properties of liquid crystal composition of comparative example 2

[0200]

[0201] Comparative Example 3

[0202] The formula of the liquid crystal composition and the corresponding properties are shown in Table 15 below.

[0203] Table 15 Formulation and corresponding properties of liquid crystal composition of comparative example 3

[0204]

[0205] Comparative Example 4

[0206] The formula of the liquid crystal composition and the corresponding properties are shown in Table 16 below.

[0207] Table 16 Formulation and corresponding properties of liquid crystal composition of Comparative Example 4

[0208]

[0209]

[0210] Comparative Example 5

[0211] The formula of the liquid crystal composition and the corresponding properties are shown in Table 17 below.

[0212] Table 17 Formulation and corresponding properties of liquid crystal composition of comparative example 5

[0213]

[0214] Table 18 Test data of transmittance and response time of examples and comparative examples

[0215]

[0216]

[0217] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Cell Gap(μm) 3.0 2.7 2.8 2.8 2.8 △n 0.108 0.119 0.113 0.113 0.114 △ε -3.70 -3.86 -3.82 -3.85 -3.85 ε⊥ 7.50 7.74 7.68 7.71 7.73 γ1 89.1 98.0 88.5 89.7 89.7 K11 13.4 13.9 13.8 13.8 13.8 γ1 / K 6.66 7.04 6.41 6.52 6.52 Tr％ 5.76％ 5.74％ 5.74％ 5.73％ 5.73％ RT(ms) 24.6 21.1 20.6 21.0 21.0

[0218] It can be seen from Table 18 that under the same retardation design (Δnd=320nm), because the liquid crystal compositions provided by Examples 1-10 of the present invention have a greater optical anisotropy than the liquid crystal compositions provided by Comparative Examples 1-5, and Δn is between 0.130 and 0.135, the liquid crystal compositions provided by the embodiments of the present invention can match a liquid crystal cell with a smaller cell thickness, thereby obtaining a faster response speed. In addition, the liquid crystal compositions provided by the embodiments of the present invention also have a higher transmittance.

[0219] 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, 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, or an alkoxy group having 1 to 10 carbon atoms.

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 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 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 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 1 or 2, and when m represents 2, the two Optional same or different.

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 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, or an alkoxy group having 1 to 10 carbon atoms.

6. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VII, in, R 13 , R 14 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.

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 VIII, in, R 15 , R 16 Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms.

8. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula IX, in, R 17 , R 18 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.

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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