Cholesteric liquid crystal composition and use thereof

Abstract

The present invention relates to the technical field of liquid crystal display, and specifically relates to a cholesteric liquid crystal composition and the use thereof. The cholesteric liquid crystal composition of the present invention comprises one or more compounds as represented by general formula I below, one or more compounds as represented by general formula II below, one or more compounds as represented by general formula III below, one or more compounds as represented by general formula IV below, one or more compounds as represented by general formula V below, and one or more compounds as represented by general formula VI below. The cholesteric liquid crystal composition of the present invention has the characteristic that the central reflection wavelength thereof has good temperature stability due to the synergistic effect among the compounds as represented by general formulas I-VI, which is embodied in that within the range of 0-50°C, the variation of the central reflection wavelength does not exceed 5 nm; and the cholesteric liquid crystal composition is particularly suitable for a cholesteric bistable display, and can improve the display effect of existing bistable displays in a relatively wide temperature range.

Description

A cholesteric phase liquid crystal composition and its application

[0001] Cross-references

[0002] This application claims priority to Chinese Patent Application No. 202411917015.4, filed on December 24, 2024, entitled “A Cholesteric Liquid Crystal Composition and Its Application Thereof,” the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This invention relates to the field of liquid crystal display technology, and more specifically to a cholesteric liquid crystal composition and its application. Background Technology

[0004] Currently, the application fields of liquid crystals have been significantly expanded to various display devices, electro-optical devices, electronic components, sensors, etc. Among them, bistable liquid crystal compositions, due to their bistable nature, can continuously display static images without power supply, and therefore can be used in e-books, electronic tags, display panels, etc., which require particularly low power consumption.

[0005] By adding chiral compounds to nematic liquid crystal compositions, cholesteric liquid crystals with twisted orientation can be made. Display elements made using cholesteric liquid crystals exhibit bistable stability, maintaining either a planar or focal conic state for extended periods without the need for an electric field. Switching is only achieved by applying a corresponding pulse voltage when the displayed content needs to be changed. Such liquid crystal compositions are also called bistable liquid crystal compositions. In the planar state, cholesteric liquid crystals reflect light of a specific wavelength, with the central wavelength of the reflected light satisfying Bragg's law of reflection: λ = nP, where n is the average refractive index and P is the helical pitch. The helical pitch of cholesteric liquid crystals has a significant impact on their optical properties; the characteristics of light transmission and selective light scattering are mainly determined by the helical pitch. However, the helical pitch of cholesteric liquid crystals exhibits significant temperature sensitivity, changing with temperature. This causes the central wavelength λ of the reflection of the bistable liquid crystal to change with temperature, resulting in a visual color shift. Summary of the Invention

[0006] This invention provides a cholesteric liquid crystal composition and its applications to address the aforementioned problems in the prior art. The cholesteric liquid crystal composition of this invention exhibits minimal change in the reflectance center wavelength over a wide temperature range, overcoming the temperature dependence of existing bistable displays, avoiding color differences caused by temperature variations, improving display performance, and broadening its application range.

[0007] According to a first aspect of the present invention, a cholesteric liquid crystal composition is provided, comprising one or more compounds represented by general formula I, one or more compounds represented by general formula II, one or more compounds represented by general formula III, one or more compounds represented by general formula IV, one or more compounds represented by general formula V, and one or more compounds represented by general formula VI.

[0008] Among them, R1, R2, R3, R 61 and R 62 Whether identical or different, each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; R 41 Represents alkenyl groups with 2 to 7 carbon atoms; R 42 R 51 and R 52 Whether the two are the same or different, they each independently represent an alkyl group or an alkoxy group with 1 to 7 carbon atoms.

[0009] L 11 L 21 L 31 and L 32 Whether the two are the same or different, they independently represent F, Cl, or H; L 51 and L 52 Whether they are the same or different, they each independently represent F, Cl, H or -CH3.

[0010] Ring A, ring B, and ring C may be the same or different, each independently representing 1,4-cyclohexylene or 1,4-phenylene.

[0011] Z1, Z2, and Z3 may be the same or different, and each independently represents a single bond or -COO-.

[0012] a and b may be the same or different, each representing 0 or 1 independently; c and d may be the same or different, each representing 0, 1 or 2 independently.

[0013] The cholesteric liquid crystal composition of the present invention has a large refractive index anisotropy (Δn) and a large dielectric anisotropy (Δε). At the same time, the central wavelength of the reflected light of the cholesteric liquid crystal composition of the present invention changes very little with temperature, which can effectively improve the situation where the color of existing bistable liquid crystals changes greatly with temperature.

[0014] Furthermore, the compound represented by general formula I is selected from one or more of formulas I-1 to I-2:

[0015] Wherein, R1 represents the same meaning as R1 in general formula I, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms.

[0016] Preferably, R1 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms;

[0017] More preferably, R1 represents an alkyl group having 2 to 5 carbon atoms.

[0018] The compound represented by general formula I of this invention has a large dielectric anisotropy (Δε). By adjusting its mass percentage, the dielectric anisotropy of the liquid crystal composition can be effectively adjusted. At the same time, the compound represented by general formula I of this invention has the function of enhancing the stability of the liquid crystal phase in the focal conic and planar states.

[0019] Furthermore, the compound represented by general formula I accounts for 2% to 20% of the total mass of the cholesteric liquid crystal composition, preferably 3% to 16%, and more preferably 4% to 14%.

[0020] Furthermore, the compound represented by general formula II is selected from one or more of formulas II-1 to II-2:

[0021] Wherein, R2 represents the same meaning as R2 in general formula II, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms.

[0022] Preferably, R2 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms.

[0023] More preferably, R2 represents an alkyl group having 2 to 5 carbon atoms.

[0024] The compounds represented by general formula II have large dielectric anisotropy (Δε) and excellent miscibility. By adjusting their mass percentage, the dielectric anisotropy and miscibility of the liquid crystal composition can be effectively adjusted.

[0025] Furthermore, the compound represented by general formula II accounts for 8% to 32% of the total mass of the cholesteric liquid crystal composition, preferably 12% to 25%, and more preferably 15% to 22%.

[0026] Furthermore, the compound represented by general formula III is selected from one or more of formulas III-1 to III-4:

[0027] Wherein, R3 represents the same meaning as R3 in general formula III, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms.

[0028] Preferably, R3 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms.

[0029] More preferably, R3 represents an alkyl group having 3 to 5 carbon atoms.

[0030] The compound represented by general formula III has a large dielectric anisotropy and a high refractive index anisotropy (Δn). By adjusting its mass percentage, the dielectric anisotropy and refractive index anisotropy of the liquid crystal composition can be adjusted simultaneously.

[0031] Furthermore, the compound represented by general formula III accounts for 20% to 45% of the total mass of the cholesteric liquid crystal composition, preferably 24% to 42%, and more preferably 28% to 39%.

[0032] Furthermore, the compound represented by general formula IV is selected from one or more of formulas IV-1 to IV-4:

[0033] Among them, R 42 Represents R in general formula IV 42 With the same meaning, alkyl groups having 1 to 5 carbon atoms or alkoxy groups having 1 to 5 carbon atoms are preferred.

[0034] Compounds represented by general formula IV have high refractive index anisotropy and excellent miscibility. By adjusting their mass percentage, the refractive index anisotropy of liquid crystal compositions can be effectively adjusted and their solubility improved.

[0035] Furthermore, the compound represented by general formula IV accounts for 1% to 16% of the total mass of the cholesteric liquid crystal composition, preferably 1% to 12%, and more preferably 2% to 9%.

[0036] Furthermore, the compound represented by the general formula V is selected from one or more of formulas V-1 to V-5:

[0037] Among them, R 51 and R 52 Represents R in general formula V 51 and R 52 With the same meaning, alkyl groups having 1 to 5 carbon atoms or alkoxy groups having 1 to 5 carbon atoms are preferred.

[0038] Compounds represented by general formula V have high refractive index anisotropy. By adjusting their mass percentage, the refractive index anisotropy of liquid crystal compositions can be effectively adjusted.

[0039] Furthermore, the compound represented by general formula V accounts for 18% to 45% of the total mass of the cholesteric liquid crystal composition, preferably 24% to 42%, and more preferably 30% to 38%.

[0040] Furthermore, the compound represented by general formula VI is selected from one or more of formulas VI-1 to VI-3:

[0041] Among them, R 61 and R 62 Represents R in general formula VI 61 and R 62 With the same meaning, alkyl groups having 1 to 6 carbon atoms, alkoxy groups having 1 to 6 carbon atoms, or alkenyl groups having 2 to 6 carbon atoms are preferred.

[0042] The compound represented by general formula VI is a helical chiral agent, which has the ability to twist into a helical shape. Adjusting its mass percentage can make the liquid crystal composition of the present invention exhibit different pitches, thereby reflecting colors of different wavelengths.

[0043] Furthermore, the compound represented by general formula VI accounts for 1% to 12% of the total mass of the cholesteric liquid crystal composition, preferably 2% to 10%, and more preferably 2% to 7%.

[0044] Furthermore, the cholesteric liquid crystal composition comprises the following components:

[0045] (1) Compounds represented by general formula I with a mass percentage of 2% to 20%;

[0046] (2) Compounds represented by general formula II in a mass percentage of 8% to 32%;

[0047] (3) Compounds represented by general formula III with a mass percentage of 20% to 45%;

[0048] (4) Compounds represented by general formula IV with a mass percentage of 1% to 16%;

[0049] (5) Compounds represented by general formula V with a mass percentage of 18% to 45%;

[0050] (6) Compounds represented by general formula VI with a mass percentage of 1% to 12%.

[0051] Compared with traditional bistable liquid crystals, through extensive research on the photoelectric and physical properties of existing liquid crystal compounds, this invention has experimentally discovered that the combination of liquid crystal compounds represented by general formula I and general formula II plays an important role in improving the miscibility of liquid crystal compositions. It also has a certain effect on maintaining the stability of the planar and focal conic states of cholesteric liquid crystals, making it particularly suitable for cholesteric bistable displays. This can improve the display performance of existing bistable displays over a wider temperature range. Furthermore, this invention has experimentally discovered that combining the six liquid crystal compounds of general formulas I to VI in a specific ratio can achieve a better synergistic effect, resulting in a liquid crystal composition with good temperature stability of the primary reflection wavelength. Specifically, the change in primary reflection wavelength does not exceed 5 nm within the range of 0℃ to 50℃.

[0052] Preferably, it comprises the following components:

[0053] (1) Compounds represented by general formula I with a mass percentage of 3% to 16%;

[0054] (2) Compounds represented by general formula II with a mass percentage of 12% to 25%;

[0055] (3) Compounds represented by general formula III with a mass percentage of 24% to 42%;

[0056] (4) Compounds represented by general formula IV with a mass percentage of 1% to 12%;

[0057] (5) Compounds represented by general formula V with a mass percentage of 24% to 42%;

[0058] (6) Compounds represented by general formula VI with a mass percentage of 2% to 10%.

[0059] More preferably, it includes the following components:

[0060] (1) Compounds represented by general formula I with a mass percentage of 4% to 14%;

[0061] (2) Compounds represented by general formula II with a mass percentage of 15% to 22%;

[0062] (3) Compounds represented by general formula III with a mass percentage of 28% to 39%;

[0063] (4) Compounds represented by general formula IV with a mass percentage of 2% to 9%;

[0064] (5) Compounds represented by general formula V with a mass percentage of 30% to 38%;

[0065] (6) Compounds represented by general formula VI with a mass percentage of 2% to 7%.

[0066] Particularly preferably, the cholesteric liquid crystal composition comprises the following components:

[0067] (1) Compounds represented by general formula I with a mass percentage of 7% to 8%;

[0068] (2) Compounds represented by general formula II with a mass percentage of 16% to 20%;

[0069] (3) Compounds represented by general formula III with a mass percentage of 30% to 35%;

[0070] (4) Compounds represented by general formula IV with a mass percentage of 3% to 6%;

[0071] (5) Compounds represented by general formula V with a mass percentage of 31% to 35%;

[0072] (6) Compounds represented by general formula VI with a mass percentage of 4% to 5%.

[0073] Furthermore, the cholesteric liquid crystal composition further includes one or more compounds represented by general formula VII:

[0074] R7 represents an alkyl group with 1 to 7 carbon atoms, an alkoxy group with 1 to 7 carbon atoms, or an alkenyl group with 2 to 7 carbon atoms.

[0075] L 71 and L 72 Whether they are the same or different, they each independently represent F, Cl, or H.

[0076] e and f may be the same or different, each independently representing 1 or 2, and not both being 2 at the same time.

[0077] The compounds represented by general formula VII have moderate dielectric anisotropy and moderate refractive index anisotropy. When added to the cholesteric liquid crystal composition of the present invention, they can improve the low-temperature stability of the liquid crystal composition.

[0078] Preferably, the compound represented by general formula VII is selected from one or more of formulas VII-1 to VII-9:

[0079] Wherein, R7 represents the same meaning as R7 in general formula VII, preferably an alkoxy group with 1 to 5 carbon atoms or an alkenyl group with 2 to 5 carbon atoms.

[0080] Furthermore, the cholesteric liquid crystal composition further includes one or more compounds represented by general formula VIII:

[0081] Where R 81 and R 82Whether the two groups are the same or different, they each independently represent alkyl groups with 1 to 7 carbon atoms, alkoxy groups with 1 to 7 carbon atoms, or alkenyl groups with 2 to 7 carbon atoms.

[0082] Ring D and ring E may be the same or different, each independently representing 1,4-cyclohexylene or 1,4-phenylene in which hydrogen atoms can be substituted by fluorine atoms.

[0083] Z4 represents a single bond or -COO-.

[0084] g represents 1, 2, or 3, and when g is not 1, rings D and Z4 can be the same or different.

[0085] The compounds represented by general formula VIII have moderate refractive index anisotropy. When added to the cholesteric liquid crystal composition of the present invention, they can effectively adjust the clearing point of the liquid crystal and improve the miscibility of the liquid crystal composition.

[0086] Preferably, the compound represented by general formula VIII is selected from one or more of formulas VIII-1 to VIII-15:

[0087] Among them, R 81 and R 82 Represents R in general formula VIII 81 and R 82 With the same meaning, alkyl groups having 1 to 5 carbon atoms, alkoxy groups having 1 to 5 carbon atoms, or alkenyl groups having 2 to 5 carbon atoms are preferred.

[0088] The liquid crystal composition of the present invention can appropriately expand the parameter range of the liquid crystal composition and improve the solubility of the liquid crystal composition by adding compounds represented by general formula VII and / or general formula VIII.

[0089] In some specific embodiments, the cholesteric liquid crystal composition comprises the following components:

[0090] (1) Compounds represented by general formula I with a mass percentage of 6% to 7%;

[0091] (2) Compounds represented by general formula II with a mass percentage of 9% to 10%;

[0092] (3) Compounds represented by general formula III with a mass percentage of 40% to 45%;

[0093] (4) Compounds represented by general formula IV with a mass percentage of 7% to 8%;

[0094] (5) Compounds represented by general formula V with a mass percentage of 20% to 25%;

[0095] (6) Compounds represented by general formula VI with a mass percentage of 4% to 5%;

[0096] (7) Compounds represented by general formula VII with a mass percentage of 1.5% to 2.5%;

[0097] (8) Compounds represented by general formula VIII with a mass percentage of 1.5% to 2.5%.

[0098] The cholesteric liquid crystal composition of the present invention can also be polymerized and solidified by adding various polymeric compounds and then by ultraviolet irradiation or heating to form a polymer-stable bistable liquid crystal.

[0099] Furthermore, in order to improve the stability of the cholesteric phase liquid crystal composition to heat and light, especially ultraviolet light, the liquid crystal composition further includes one or more of ultraviolet absorbers, hindered amine light stabilizers, and hindered phenolic antioxidants; preferably, the ultraviolet absorber is selected from one or more of benzotriazoles, benzophenones, triazines, and benzoic acid esters.

[0100] The preparation method of the cholesteric liquid crystal composition of the present invention is not particularly limited. It can be produced by mixing two or more compounds using conventional methods, such as by mixing different components and dissolving them together at high temperature. In this method, the cholesteric liquid crystal composition is dissolved in a solvent used for the compound and mixed, and then the solvent is distilled off under reduced pressure. Alternatively, the cholesteric liquid crystal composition of the present invention can be prepared by conventional methods, such as dissolving a component with a smaller content in a major component with a larger content at a higher temperature, or dissolving each component in an organic solvent, such as acetone, chloroform, or methanol, and then mixing the solutions to remove the solvent.

[0101] All compounds involved in this invention are known compounds, commercially available, or provided by Beijing Bayi Space-Time Liquid Crystal Technology Co., Ltd.

[0102] According to a second aspect of the present invention, the present invention also provides the use of the above-described cholesteric liquid crystal composition in a liquid crystal display element or liquid crystal display device.

[0103] The cholesteric liquid crystal composition provided by this invention, through the synergistic effect between compounds represented by general formula I, general formula II, general formula III, general formula IV, general formula V, and general formula VI, exhibits good temperature stability of the primary reflection wavelength. Specifically, the change in primary reflection wavelength does not exceed 5 nm within the range of 0℃ to 50℃. It is particularly suitable for cholesteric bistable displays and can improve the display effect of existing bistable displays over a wider temperature range. Detailed Implementation

[0104] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0105] Unless otherwise stated, percentages in this invention are weight percentages; temperature is in degrees Celsius; Δn represents optical anisotropy (25°C); ε ∥ and ε ⊥ λ_25, λ_0, and λ_50 represent the parallel dielectric constant and the perpendicular dielectric constant (25℃, 1000Hz), respectively; Δε represents the dielectric anisotropy (25℃, 1000Hz); Tni represents the clearing point of the liquid crystal composition (℃); λ_25, λ_0, and λ_50 represent the main reflection wavelength at 25℃, 0℃, and 50℃, respectively; Δλ represents the maximum offset of the main reflection wavelength from 25℃ to 50℃.

[0106] In the following embodiments, the group structures in the liquid crystal compounds are represented by the codes shown in Table 1.

[0107] Table 1: Group structure codes of liquid crystal compounds

[0108] Take the following compound structure as an example:

[0109] Represented as: 3CPEGaN

[0110] Represented as: 4PMPN

[0111] In the following embodiments, the liquid crystal composition is prepared by a thermal dissolution method, including the following steps: weighing the liquid crystal compound by weight percentage using a balance, wherein there is no specific requirement for the order of weighing and adding, usually weighing and mixing in order of the melting point of the liquid crystal compound from high to low, heating and stirring at 60 to 100°C to make the components melt evenly, then filtering, rotary evaporating, and finally encapsulating to obtain the target sample.

[0112] In the following examples and comparative examples, the weight percentage of each component in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following table.

[0113] Table 2

[0114] Example 1

[0115] Table 3

[0116] Example 2

[0117] Table 4

[0118] Example 3

[0119] Table 5

[0120] Example 4

[0121] Table 6

[0122] Example 5

[0123] Table 7

[0124] Example 6

[0125] Table 8

[0126] Example 7

[0127] Table 9

[0128] Example 8

[0129] Table 10

[0130] Comparative Example 1

[0131] Table 11

[0132] Comparative Example 2

[0133] In Comparative Examples 1 and 2, S5011 and S811 are chiral agents with the following specific structures:

[0134] The performance parameters of the liquid crystal compositions obtained in Examples 1 to 8 and Comparative Examples 1 and 2 are summarized and compared, as shown in Table 12.

[0135] Table 12

[0136] As can be seen from the experimental data in Table 12, the cholesteric liquid crystal composition of the present invention has the characteristic of good temperature stability of the primary reflection wavelength. Specifically, the change in primary reflection wavelength does not exceed 5 nm within the range of 0℃ to 50℃, making it particularly suitable for cholesteric bistable displays and improving the display effect of existing bistable displays over a wider temperature range. Compared with Comparative Examples 1 and 2, under similar physical properties (Tni, Δn, Δε) and the same primary reflection wavelength at room temperature (25℃), the liquid crystal compositions provided in Examples 1 and 2 exhibit smaller wavelength changes within the range of 0℃ to 50℃.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cholesteric liquid crystal composition, characterized in that, It comprises one or more compounds represented by general formula I, one or more compounds represented by general formula II, one or more compounds represented by general formula III, one or more compounds represented by general formula IV, one or more compounds represented by general formula V, and one or more compounds represented by general formula VI. Among them, R1, R2, R3, R 61 and R 62 Whether identical or different, each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms; R 41 Represents alkenyl groups with 2 to 7 carbon atoms; R 42 R 51 and R 52 Whether the two are the same or different, they each independently represent an alkyl group having 1 to 7 carbon atoms or an alkoxy group having 1 to 7 carbon atoms; L 11 L 21 L 31 and L 32 Whether the two are the same or different, they independently represent F, Cl, or H; L 51 and L 52 Whether they are the same or different, they each independently represent F, Cl, H or -CH3; Ring A, ring B, and ring C may be the same or different, each independently representing 1,4-cyclohexylene or 1,4-phenylene; Z1, Z2, and Z3 may be the same or different, and each independently represents a single bond or -COO-; a and b may be the same or different, each representing 0 or 1 independently; c and d may be the same or different, each representing 0, 1 or 2 independently.

2. The cholesteric liquid crystal composition according to claim 1, characterized in that, The compound represented by general formula I is selected from one or more of formulas I-1 to I-2: Wherein, R1 represents the same meaning as R1 in general formula I, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; Preferably, R1 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; More preferably, R1 represents an alkyl group having 2 to 5 carbon atoms; And / or, the compound represented by general formula I accounts for 2% to 20% of the total mass of the cholesteric liquid crystal composition, preferably 3% to 16%, more preferably 4% to 14%.

3. The cholesteric liquid crystal composition according to claim 1, characterized in that, The compound represented by general formula II is selected from one or more of formulas II-1 to II-2: Wherein, R2 represents the same meaning as R2 in general formula II, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; Preferably, R2 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; More preferably, R2 represents an alkyl group having 2 to 5 carbon atoms; And / or, the compound represented by general formula II accounts for 8% to 32% of the total mass of the cholesteric liquid crystal composition, preferably 12% to 25%, more preferably 15% to 22%.

4. The cholesteric liquid crystal composition according to claim 1, characterized in that, The compound represented by general formula III is selected from one or more of formulas III-1 to III-4: Wherein, R3 represents the same meaning as R3 in general formula III, preferably an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; Preferably, R3 represents an alkyl group having 2 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms; More preferably, R3 represents an alkyl group having 3 to 5 carbon atoms; And / or, the compound represented by general formula III accounts for 20% to 45% of the total mass of the cholesteric liquid crystal composition, preferably 24% to 42%, more preferably 28% to 39%.

5. The cholesteric liquid crystal composition according to claim 1, characterized in that, The compound represented by general formula IV is selected from one or more of formulas IV-1 to IV-4: Among them, R 42 Represents R in general formula IV 42 With the same meaning, alkyl groups having 1 to 5 carbon atoms or alkoxy groups having 1 to 5 carbon atoms are preferred; And / or, the compound represented by general formula IV accounts for 1% to 16% by mass of the total amount of the cholesteric liquid crystal composition, preferably 1% to 12%, more preferably 2% to 9%.

6. The cholesteric liquid crystal composition according to claim 1, characterized in that, The compound represented by the general formula V is selected from one or more of formulas V-1 to V-5: Among them, R 51 and R 52 Represents R in general formula V 51 and R 52 With the same meaning, alkyl groups having 1 to 5 carbon atoms or alkoxy groups having 1 to 5 carbon atoms are preferred; And / or, the compound represented by the general formula V accounts for 18% to 45% of the total mass of the cholesteric liquid crystal composition, preferably 24% to 42%, more preferably 30% to 38%; And / or, the compound represented by general formula VI is selected from one or more of formulas VI-1 to VI-3: Among them, R 61 and R 62 Represents R in general formula VI 61 and R 62 With the same meaning, alkyl groups having 1 to 6 carbon atoms, alkoxy groups having 1 to 6 carbon atoms, or alkenyl groups having 2 to 6 carbon atoms are preferred; And / or, the compound represented by general formula VI accounts for 1% to 12% of the total mass of the cholesteric liquid crystal composition, preferably 2% to 10%, more preferably 2% to 7%.

7. The cholesteric liquid crystal composition according to any one of claims 1-6, characterized in that, Includes the following components: (1) Compounds represented by general formula I with a mass percentage of 2% to 20%; (2) Compounds represented by general formula II in a mass percentage of 8% to 32%; (3) Compounds represented by general formula III with a mass percentage of 20% to 45%; (4) Compounds represented by general formula IV with a mass percentage of 1% to 16%; (5) Compounds represented by general formula V with a mass percentage of 18% to 45%; (6) Compounds represented by general formula VI with a mass percentage of 1% to 12%.

8. The cholesteric liquid crystal composition according to claim 7, characterized in that, Includes the following components: (1) Compounds represented by general formula I with a mass percentage of 3% to 16%; (2) Compounds represented by general formula II with a mass percentage of 12% to 25%; (3) Compounds represented by general formula III with a mass percentage of 24% to 42%; (4) Compounds represented by general formula IV with a mass percentage of 1% to 12%; (5) Compounds represented by general formula V with a mass percentage of 24% to 42%; (6) Compounds represented by general formula VI with a mass percentage of 2% to 10%; Preferably, it comprises the following components: (1) Compounds represented by general formula I with a mass percentage of 4% to 14%; (2) Compounds represented by general formula II with a mass percentage of 15% to 22%; (3) Compounds represented by general formula III with a mass percentage of 28% to 39%; (4) Compounds represented by general formula IV with a mass percentage of 2% to 9%; (5) Compounds represented by general formula V with a mass percentage of 30% to 38%; (6) Compounds represented by general formula VI with a mass percentage of 2% to 7%.

9. The cholesteric liquid crystal composition according to any one of claims 1-8, characterized in that, The cholesteric liquid crystal composition further includes one or more compounds represented by general formula VII: R7 represents an alkyl group with 1 to 7 carbon atoms, an alkoxy group with 1 to 7 carbon atoms, or an alkenyl group with 2 to 7 carbon atoms; L 71 and L 72 Whether they are the same or different, they each independently represent F, Cl, or H; e and f may be the same or different, each independently representing 1 or 2, and not both being 2 at the same time; Preferably, the compound represented by general formula VII is selected from one or more of formulas VII-1 to VII-9: Wherein, R7 represents the same meaning as R7 in general formula VII, preferably an alkoxy group with 1 to 5 carbon atoms or an alkenyl group with 2 to 5 carbon atoms; And / or, the cholesteric liquid crystal composition further includes one or more compounds represented by general formula VIII: Where R 81 and R 82 Whether the two groups are the same or different, they each independently represent alkyl groups with 1 to 7 carbon atoms, alkoxy groups with 1 to 7 carbon atoms, or alkenyl groups with 2 to 7 carbon atoms; Ring D and ring E may be the same or different, each independently representing 1,4-cyclohexylene or 1,4-phenylene in which hydrogen atoms can be substituted by fluorine atoms; Z4 represents a single bond or -COO-; g represents 1, 2, or 3, and when g is not 1, rings D and Z4 can be the same or different. Preferably, the compound represented by general formula VIII is selected from one or more of formulas VIII-1 to VIII-15: Among them, R 81 and R 82 Represents R in general formula VIII 81 and R 82 With the same meaning, alkyl groups having 1 to 5 carbon atoms, alkoxy groups having 1 to 5 carbon atoms, or alkenyl groups having 2 to 5 carbon atoms are preferred.

10. The use of the cholesteric liquid crystal composition according to any one of claims 1-9 in a liquid crystal display element or liquid crystal display device.

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