Liquid crystal composition, liquid crystal display panel, and display device

Abstract

The application provides a liquid crystal composition, a liquid crystal display panel and a display device. The liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, one or more compounds represented by formula III, and one or more compounds represented by formula IV. The chemical formulae of the compounds represented by formula I, formula II, formula III and formula IV are as follows: The liquid crystal composition provided by the application can effectively improve dielectric anisotropy and reliability, and improve the performance of the liquid crystal composition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a liquid crystal composition, a liquid crystal display panel and a display device. BACKGROUND

[0002] The liquid crystal composition is widely used in various displays, including but not limited to watches, mobile phones, televisions and computers, etc.

[0003] The display effect and performance of the liquid crystal display panel are related to the properties of the liquid crystal composition, and the optical, electrical and mechanical properties of the liquid crystal composition depend on the structure of the liquid crystal molecules and the substituent groups.

[0004] In order to improve the performance of the liquid crystal composition, the dielectric anisotropy of the liquid crystal is usually improved, and in the process of improving the dielectric anisotropy, the proportion of polar monomers in the liquid crystal composition is usually increased. However, the increase of the proportion of polar monomers will bring the risk of reliability decline, which affects the performance of the liquid crystal display panel.

[0005] With the continuous development of the liquid crystal display panel, the requirements for the display effect and performance of the liquid crystal display panel are also getting higher and higher, therefore, it is urgent to develop a liquid crystal material with better dielectric anisotropy and reliability, faster response speed and better performance. SUMMARY

[0006] The present application provides a liquid crystal composition, a liquid crystal display panel and a display device, which can effectively improve the dielectric anisotropy and reliability and improve the performance of the liquid crystal composition.

[0007] The present application provides a liquid crystal composition, which comprises one or more compounds represented by formula I, one or more compounds represented by formula II, one or more compounds represented by formula III, and one or more compounds represented by formula IV, wherein the chemical formula of the formula I, formula II, formula III and formula IV compounds is:

[0008]

[0009]

[0010] wherein,

[0011] Z denotes a single bond, -0-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -CF2-CF2-, -CF2-CH2-, -(CH2)3-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C- and one or more H in the radicals can be replaced by F, Cl, Br or I;

[0012] and each, independently of one another, denotes a single bond, in which H can be replaced by F, Cl, Br, I, and and at least one of

[0013] R1, R2, R3and R4each, independently of one another, denote H, F, Cl, Br, I, CN, SCN, NCS, SF5, or alkyl or alkoxy having 1 to 15 carbon atoms, or alkenyl or alkenyloxy having 2 to 15 carbon atoms, or alkynyl or alkynyloxy having 2 to 15 carbon atoms; in which the terminal groups of R1, R2, R3and R4may be monosubstituted by H, CN or CF3, one or more CH2groups in the radicals R1, R2, R3and R4may be replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C- and the heteroatoms are not directly bonded, and one or more H in the radicals can be replaced by F, Cl, Br or I.

[0014] In one embodiment, and each, independently of one another, denotes a single bond, in which H can be replaced by F, Cl, Br, I, and and at least one of

[0015] In one embodiment, Z represents a single bond, -CH2-CH2-, -(CH2)3-, -CH2O-, -OCH2-, and one or more H in the group can be substituted by F, Cl, Br or I.

[0016] In one embodiment, the compound represented by Formula II is selected from the group consisting of subformulae II-1 to II-51:

[0017]

[0018]

[0019] In one embodiment, the liquid crystal composition further comprises one or more compounds represented by Formula V:

[0020] wherein R5and R6each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R5and R6may be substituted by F, Cl, Br, I, one or more times.

[0021] In one embodiment, the liquid crystal composition further comprises one or more compounds represented by Formula VI:

[0022] wherein R7and R8each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R7and R8may be substituted by F, Cl, Br, I, one or more times.

[0023] In one embodiment, the liquid crystal composition further comprises one or more compounds represented by Formula VII:

[0024] wherein R9and R 10 each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R9and R 10 may be substituted by F, Cl, Br, I, one or more times.

[0025] In one embodiment, the liquid crystal composition comprises the following components by weight percentage:

[0026] 1-25% of the compound represented by Formula I;

[0027] 3-55% of the compound represented by Formula II;

[0028] 1-25% of the compound represented by Formula III; and

[0029] 1-25% of a compound represented by Formula IV.

[0030] The application also provides a liquid crystal display panel, comprising a first substrate and a second substrate arranged oppositely and a liquid crystal layer between the first substrate and the second substrate, wherein the liquid crystal layer comprises the liquid crystal composition as described above.

[0031] The application also provides a display device comprising the liquid crystal display panel as described above.

[0032] The application has the following beneficial effects:

[0033] The application provides a liquid crystal composition and a liquid crystal display panel. The liquid crystal composition comprises one or more compounds represented by Formula I, one or more compounds represented by Formula II, one or more compounds represented by Formula III, and one or more compounds represented by Formula IV. The compound represented by Formula II has an oxygen-containing heterocyclic ring, which can improve the polarity of the molecule and thus improve the dielectric anisotropy of the liquid crystal composition system. The compounds represented by Formula I, Formula II, Formula III and Formula IV are stable in structure and have good mutual solubility. The liquid crystal composition formed by the combination has high dielectric anisotropy and reliability, which can effectively improve the display effect and performance of the liquid crystal display panel. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0035] Figure 1 A schematic diagram of a liquid crystal display panel provided by the application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0037] In the description of the present application, it needs to be understood that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0038] The present application can repeatedly refer to numbers and / or letters in different embodiments, and such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0039] The present application provides a liquid crystal composition comprising one or more compounds represented by formula I, one or more compounds represented by formula II, one or more compounds represented by formula III, and one or more compounds represented by formula IV, wherein the chemical formula of the formula I, formula II, formula III and formula IV compounds is:

[0040]

[0041] wherein,

[0042] Z represents a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -CF2-CF2-, -CF2-CH2-, -(CH2)3-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-, or -C≡C-, and one or more H in the group can be substituted with F, Cl, Br, or I;

[0043] and each independently represents a single bond, wherein H can be substituted with F, Cl, Br, I, and and at least one of

[0044] R1, R2, R3and R4each independently of one another represent H, F, Cl, Br, I, CN, SCN, NCS, SF5, or alkyl or alkoxy having 1 to 15 carbon atoms, or alkenyl or alkenyloxy having 2 to 15 carbon atoms, or alkynyl or alkynyloxy having 2 to 15 carbon atoms; wherein the terminal groups of R1, R2, R3and R4may be monosubstituted by H, CN or CF3, one or more CH2groups in the radicals R1, R2, R3and R4may be replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C- and one or more H in the radicals can be replaced by F, Cl, Br or I.

[0045] In the liquid crystal composition of the present application, the compound represented by Formula I has a high clearing point (Tni), a medium viscosity and a high negative dielectric anisotropy (Δε), which can be used to increase the clearing point (Tni) and the dielectric anisotropy (Δε) of the liquid crystal composition system; the compound represented by Formula II has a high clearing point (Tni) and a medium viscosity, which can be used to increase the clearing point (Tni) and the dielectric anisotropy (Δε) and adjust the optical anisotropy (Δn) of the liquid crystal composition system; the compound represented by Formula III has a high clearing point (Tni), a medium viscosity, a high dielectric anisotropy (Δε) and a high optical anisotropy (Δn), which can be used to increase the clearing point (Tni) and the dielectric anisotropy (Δε) of the liquid crystal composition system; the compound represented by Formula IV has a high negative dielectric anisotropy (Δε) and a low viscosity, which can be used to increase the dielectric anisotropy (Δε) and improve the response time of the liquid crystal composition system. The compounds represented by Formula I, Formula II, Formula III and Formula IV are combined to form the liquid crystal composition, so that the liquid crystal composition of the present application has a suitable viscosity, a high clearing point (Tni) and a dielectric anisotropy (Δε) and an adjustable optical anisotropy (Δn) as a whole, which can improve the performance of the liquid crystal composition and reduce the response time of the liquid crystal.

[0046] Generally, in order to improve the dielectric anisotropy of the liquid crystal composition, the proportion of the polar monomer in the liquid crystal composition is appropriately increased, however, the increase of the proportion of the polar monomer will bring the risk of reliability decline. The reliability of the liquid crystal composition is related to the crystallization time and voltage holding ratio, on the one hand, the poor mutual solubility of the polar monomer and the liquid crystal composition system easily leads to crystallization at low temperature; on the other hand, the polar monomer introduced into the liquid crystal composition system is easy to produce impurity charged ions, which leads to the decline of the voltage holding ratio, and affects the display effect.

[0047] In the present application, the compounds of formula I to formula IV are all polar liquid crystal monomers, wherein the compound represented by formula II has an oxygen-containing ring which can increase the polarity of the monomer and thus improve the dielectric anisotropy of the system. In the liquid crystal composition, formula I, formula III, formula IV are structurally stable liquid crystal monomers, but the increase of the content of any one of formula I, formula III and formula IV will have a great risk of mutual solubility leading to crystallization. Therefore, in the present application, the compound represented by formula II is introduced to improve the dielectric anisotropy of the liquid crystal composition system, while ensuring the reliability of the liquid crystal composition. The compound represented by formula II, on the one hand, is structurally stable and has large dielectric anisotropy, and is not easy to produce impurity ions, on the other hand, has good mutual solubility with formula I, formula III, formula IV, and is not easy to lead to crystallization. Therefore, the liquid crystal composition combined by formula I, formula II, formula III and formula IV of the present application not only has high dielectric anisotropy, but also can maintain good reliability.

[0048] In the liquid crystal composition of the present application, the compound represented by formula II has and at least one of which is That is, the compound represented by formula II contains an oxygen-containing heterocycle, and the position of the oxygen atom in the oxygen-containing heterocycle is different, which makes the dielectric anisotropy of the liquid crystal compound different, because the oxygen atom as a polar group, when the oxygen atom is closer to the end position of the long axis of the molecule, the contribution to ε ∥ is greater, which makes ε ∥ greater, similarly, the closer the oxygen atom is to the middle of the molecule (the end of the short axis direction), the greater the contribution to ε⊥dielectric, which makes ε⊥greater, in this way, the value of the dielectric anisotropy (Δε=ε∥-ε⊥) of the liquid crystal compound will change with the position of the oxygen atom. The compound represented by formula II has and The dielectric anisotropy of liquid crystal monomers containing oxygen heterocycle is different due to the different positions of oxygen atoms, which ultimately affects the selection and amount of other monomer components. By using this characteristic, the liquid crystal monomers can be more flexible in combination with each other. Therefore, different specifications of liquid crystal compositions have different dielectric anisotropy requirements. The liquid crystal composition of the present application can adjust the dielectric anisotropy of the liquid crystal composition by adjusting or selecting compounds of formula II with different structures.

[0049] In an embodiment, and each independently of one another represents a single bond, wherein H can be mono- or polysubstituted by F, Cl, Br, I, and and at least one of A and B is

[0050] In an embodiment, Z represents a single bond, -CH2-CH2-, -(CH2)3-, -CH2O-, -OCH2-, and one or more H in the group can be substituted by F, Cl, Br, or I.

[0051] In an embodiment, the compound represented by formula II is selected from the following sub-formulae II-1 to II-51:

[0052]

[0053]

[0054] In the compounds represented by the above formulae II-1 to II-51, all contain oxygen heterocycle. The dielectric anisotropy of liquid crystal molecules containing oxygen heterocycle is different due to the different positions of oxygen atoms, which ultimately affects the selection and amount of other liquid crystal compound components.

[0055] For example: the Δε of the compound of formula II-3 is higher than that of the compound of formula II-20, only the position of oxygen in the ring is different; similarly, the Δε of the compound of formula II-4 is higher than that of the compound of formula II-21.

[0056] For another example, the Δε of the compound of formula II-4 is higher than that of the compound of formula II-7, the oxygen is on different rings.

[0057] In an embodiment, the liquid crystal composition further comprises one or more compounds represented by formula V:

[0058] R5and R6each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R5and R6may be mono- or poly-substituted by F, Cl, Br, I.

[0059] In an embodiment, the liquid crystal composition further comprises one or more compounds represented by Formula VI:

[0060] R7and R8each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R7and R8may be mono- or poly-substituted by F, Cl, Br, I.

[0061] In an embodiment, the liquid crystal composition further comprises one or more compounds represented by Formula VII:

[0062] R9and R 10 each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R9and R 10 may be mono- or poly-substituted by F, Cl, Br, I.

[0063] In the present application, the compounds of Formula V and Formula VII are non-polar monomers, the compound of Formula VI is a polar monomer, and the compounds of Formula V, Formula VI and Formula VII are used to adjust other properties of the liquid crystal composition. Among them, the compound represented by Formula V has a higher optical anisotropy (Δn) and a lower viscosity, which can be used to increase the optical anisotropy (Δn) and improve the response time of the liquid crystal composition system; the compound represented by Formula VI has a higher negative dielectric anisotropy (Δε), a higher clearing point (Tni), a higher optical anisotropy (Δn) and a lower viscosity, which can be used to increase the optical anisotropy (Δn) and the clearing point (Tni) of the liquid crystal composition system; the compound represented by Formula VII has a higher optical anisotropy (Δn) and a higher clearing point (Tni), which can be used to increase the optical anisotropy (Δn) and the clearing point (Tni) of the liquid crystal composition system. The compounds of Formula V and Formula VII have good mutual solubility with the system comprising the compounds of Formula I-IV, and the formed liquid crystal composition system is stable; the compound of Formula VI has good mutual solubility with the system of Formula I-IV, and is conducive to cooperating with the compounds of Formula I-IV to increase the dielectric anisotropy (Δε) of the liquid crystal composition and reduce power consumption.

[0064] In an embodiment, the liquid crystal composition comprises the following components by weight percentage:

[0065] 1-25% of a compound represented by Formula I;

[0066] 3-55% of a compound represented by Formula II;

[0067] 1-25% of a compound represented by Formula III; and

[0068] 1-25% of a compound represented by Formula IV.

[0069] Further, the liquid crystal composition comprises the following compounds represented by Formula V, Formula VI, and Formula VII:

[0070] 1-20% of a compound represented by Formula V;

[0071] 1-20% of a compound represented by Formula VI;

[0072] 1-20% of a compound represented by Formula VII.

[0073] It should be noted that the liquid crystal composition can further comprise a solvent and other commonly used additive components.

[0074] The liquid crystal composition of the present application is further described below through specific examples.

[0075] Experimental methods:

[0076] In the following examples, the preparation of the liquid crystal composition is performed by a hot dissolution method, including the following steps:

[0077] 1. Weigh each component compound in the liquid crystal composition by a balance according to the mass percentage, wherein the order of weighing is not specifically required, and generally the liquid crystal compounds are weighed and mixed in the order from low to high melting point to obtain a mixture;

[0078] 2. Heat and stir the mixture at 60-100°C to fully dissolve and mix the components to obtain a mixed solution;

[0079] 3. Cool the mixed solution to room temperature, and package to obtain the target sample.

[0080] Comparative examples

[0081] The liquid crystal composition of the comparative example comprises the following components:

[0082] a compound represented by Formula I a compound represented by Formula III a compound represented by Formula V a compound represented by Formula VI a compound represented by Formula VII a solvent The mass percentage of each component in the liquid crystal composition is 10%, 6%, 3%, 10%, 3%, 7%, 8%, 8%, 7%, 32%, and 6%, respectively.

[0083] The components in the liquid crystal composition of the control example were prepared into target sample 1 using the above experimental method, and the performance parameters of sample 1 were detected. The detection results are shown in Table 1.

[0084] Table 1 shows the components, proportions, and performance parameters of the liquid crystal composition of the control example.

[0085]

[0086]

[0087] Example 1

[0088] The liquid crystal composition of Example 1 comprises components:

[0089] The compound represented by Formula I The compound represented by Formula II The compound represented by Formula III The compound represented by Formula IV The compound represented by Formula V The compound represented by Formula VI, The compound represented by Formula VII Solvent The mass percentage of each component in the liquid crystal composition is 10%, 8%, 8%, 6%, 10%, 3%, 7%, 3%, 7%, 32%, and 6%, respectively.

[0090] The components in the liquid crystal composition of Example 1 were prepared into target sample 2 using the above experimental method, and the performance parameters of sample 2 were detected. The detection results are shown in Table 2.

[0091] Table 2 shows the components, proportions, and performance parameters of the liquid crystal composition of Example 1.

[0092]

[0093] Example 2

[0094] The liquid crystal composition of Example 2 comprises components:

[0095] The compound represented by Formula I The compound represented by Formula II The compound represented by Formula III The compound represented by Formula IV The compound represented by Formula V a compound represented by formula VI, a compound represented by formula VII a solvent The mass percentages of the above components in the liquid crystal composition are 9%, 8%, 8%, 9%, 6%, 5%, 7%, 3%, 7%, 32%, and 6%, respectively.

[0096] The components in the liquid crystal composition of Example 2 were prepared into a target sample 3 by using the above experimental method, and the performance parameters of sample 3 were detected. The detection results are shown in Table 3.

[0097] Table 3 Components, proportions, and performance parameters of the liquid crystal composition of Example 2

[0098]

[0099]

[0100] Unless otherwise specified, the percentages in this application are all weight percentages, and the total weight percentage of the liquid crystal composition is 100%; the temperature unit is ℃; Tni represents the clearing point of the liquid crystal composition (unit: ℃); Δn represents the optical anisotropy at 25℃, n e is the refractive index of the extraordinary light; γ1 represents the rotational viscosity at 25℃ (unit: mPa·s); Δε represents the dielectric anisotropy at 25℃, ε ⊥ is the dielectric constant perpendicular to the long axis of the liquid crystal molecule; K 11 is the twist elastic constant, K 33 is the splay elastic constant.

[0101] As can be seen from the above examples, the liquid crystal composition of Comparative Example 1 does not contain the compound represented by formula II, and the liquid crystal compositions of Example 1 and Example 2 contain the compound represented by formula II. As can be seen from the performance parameters of the liquid crystal compositions of the above examples, the dielectric anisotropy value |Δε| of the liquid crystal compositions of Example 1 and Example 2 is higher than that of the comparative example, the crystallization-free holding time of the compositions of Example 1 and Example 2 at -20℃ is higher than that of the comparative example, and the voltage holding rate of Example 1 and Example 2 is higher than that of the comparative example.

[0102] Compared with the comparative example, Example 1 and Example 2 have similar polarity component proportions, and both of them have advantages in |Δε| and reliability, wherein the later the crystallization at -20℃, the better the reliability; the voltage holding rate is an index for evaluating the concentration of charged ions in the mixed crystal in the test cell, and the higher the voltage holding rate, the better the reliability.

[0103] The application also provides a liquid crystal display panel 10, comprising a first substrate 1 and a second substrate 2 arranged oppositely, and a liquid crystal layer 3 between the first substrate 1 and the second substrate 2, wherein the liquid crystal layer 3 comprises the liquid crystal composition as described above.

[0104] The liquid crystal display panel described in the application can be one of a twisted nematic (TN) type liquid crystal display panel, a fringe field switching (FFS) type liquid crystal display panel or an in-plane switching (IPS) type liquid crystal display panel, but is not limited thereto.

[0105] The application also provides a display device comprising the liquid crystal display panel as described above, which can be a panel for a car, a mobile phone, a smart phone, a notebook personal computer, a tablet PC, a television, etc.

[0106] To sum up, although the application has disclosed the above preferred embodiments, the above preferred embodiments are not used to limit the application, and those skilled in the art can make various modifications and decorations without departing from the spirit and scope of the application, therefore the protection scope of the application is subject to the scope defined by the claims.

Claims

1. A liquid crystal composition, characterized by comprising comprising one or more compounds represented by Formula I, one or more compounds represented by Formula II, one or more compounds represented by Formula III, and one or more compounds represented by Formula IV, wherein the Formula I, Formula III, and Formula IV compounds have the formula: I， III, Ⅳ； the Formula II compounds are selected from the group consisting of sub-formulae II-1 to II-12, II-14 to II-17, II-19 to II-20, and II-22 to II-51: wherein R1, R2, R3, and R4 each independently of one another represent H, F, Cl, Br, I, CN, SCN, NCS, SF5, or an alkyl or alkoxy group having 1-15 carbon atoms, or an alkenyl or alkenyloxy group having 2-15 carbon atoms, or an alkynyl or alkynyloxy group having 2-15 carbon atoms; wherein the terminal groups of R1, R2, R3, and R4 can be monosubstituted by H, CN, or CF3, one or more CH2 groups in the R1, R2, R3, and R4 groups can be replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-, or -C≡C- and the heteroatoms are not directly bonded, and one or more H in the groups can be replaced by F, Cl, Br, or I.

2. The liquid crystal composition according to claim 1, characterized by the liquid crystal composition further comprises one or more compounds represented by Formula V: V； wherein R5 and R6 each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl, or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R5 and R6 can be monosubstituted or polysubstituted by F, Cl, Br, or I.

3. The liquid crystal composition according to claim 1, characterized by the liquid crystal composition further comprises one or more compounds represented by Formula VI: VI; wherein R7 and R8 each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl, or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R7 and R8 can be monosubstituted or polysubstituted by F, Cl, Br, or I.

4. The liquid crystal composition according to claim 1, characterized by the liquid crystal composition further comprises one or more compounds represented by Formula VII: VII; wherein R9and R 10 each independently represent an alkyl or alkoxy group having 1-10 carbon atoms, or an alkenyl, alkenyloxy, alkynyl or alkynyloxy group having 2-10 carbon atoms; wherein the H atoms in R9and R 10 may be mono- or poly-substituted by F, Cl, Br, I.

5. The liquid crystal composition according to any one of claims 1 to 4, characterized by, the liquid crystal composition comprises the following components by weight percentage: 1-25% of the compounds represented by Formula I; 3-55% of the compounds represented by Formula II; 1-25% of the compounds represented by Formula III; and 1-25% of the compounds represented by Formula IV.

6. A liquid crystal display panel, characterized by comprising: A liquid crystal display panel comprising a first substrate and a second substrate arranged opposite to each other and a liquid crystal layer between the first substrate and the second substrate, the liquid crystal layer comprising the liquid crystal composition according to any one of claims 1-5.

7. A display device, characterized by comprising: A liquid crystal display panel comprising the liquid crystal display panel according to claim 6.

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