Liquid crystal composition and liquid crystal optical element

Abstract

The present application provides a liquid crystal composition, comprising at least one compound of the general formula (1), at least one of the compounds of the general formula (2), and at least one of the compounds of the general formula (3) and the compounds of the general formula (4). The liquid crystal composition provided by the present application has a greater diffraction efficiency, and the transmittance does not decrease due to the increase in diffraction efficiency. In addition, the present application also provides a liquid crystal optical element.

Description

Technical Field

[0001] The present application belongs to the field of liquid crystal technology, and specifically relates to a liquid crystal composition and a liquid crystal optical element. Background Art

[0002] In recent years, liquid crystal materials have been widely used in the display industry and phase optical components. Televisions, computer monitors, and mobile phone monitors use the optical anisotropy and dielectric anisotropy of liquid crystal materials to achieve display functions. Liquid crystal materials are mixed with polymerizable monomers under the conditions of photosensitizers and UV irradiation to form mosaic polymer dispersed liquid crystals (PDLC), which have also been widely used in the direction of dimming films.

[0003] At the same time, the formation of holographic volume gratings and optical waveguide devices by liquid crystal materials and polymerizable material monomers under the irradiation of photosensitizers and coherent light sources has also been widely studied and tested. The manufacture of optical waveguides may include material systems that allow recording of holographic optical elements in waveguides. For example, it includes a polymer dispersed liquid crystal (PDLC) mixture, which is a mixture containing photopolymerizable monomers and liquid crystals. It also includes a holographic polymer dispersed liquid crystal (HPDLC) mixture, which can be irradiated in this liquid mixture with two coherent laser beams to record such as volume phase. During the recording process, the monomers are polymerized, and the mixture undergoes photopolymerization-induced phase separation to form a rich liquid crystal region filled with liquid crystal droplets, interspersed with transparent polymer poor liquid crystal regions, and alternating rich liquid crystal regions and poor liquid crystal regions form the stripe surface of the grating. The final grating, usually called a switchable Bragg grating (SBG), has all the properties commonly associated with volume or Bragg gratings, and has a higher refractive index modulation range and the ability to electrically tune the grating over a continuous range of diffraction efficiency (the proportion of incident light diffracted to the desired direction) compared to the Bragg grating.

[0004] The optical waveguide devices described above can be used in a range of display and sensor applications. In many applications, waveguides containing one or more grating layers encoding multiple optical functions can be realized using various waveguide structures and material systems, such as near-eye displays for augmented reality (AR) and virtual reality (VR), compact head-up displays (HUD) and helmet displays or head-mounted displays (HMD) for road transportation, aviation and military applications, as well as for biometrics and lidar.

[0005] The field of view angle of the polymer dispersed liquid crystal structure in the related art is relatively small. At the same time, if the field of view angle needs to be increased, other parameters such as diffraction efficiency will be reduced, which becomes an obstacle to limiting the application of this type of liquid crystal material. Summary of the invention

[0006] The purpose of the present application is to provide a liquid crystal composition and a liquid crystal optical element to improve at least part of the above-mentioned technical problems.

[0007] The embodiment of the present application provides a liquid crystal composition, comprising at least one of the compounds of the general formula (1), at least one of the compounds of the general formula (2), at least one of the compounds of the general formula (3), and at least one of the compounds of the general formula (4);

[0008] The compound of general formula (1) is:

[0009] The compound of general formula (2) is: Among them, R 1 and R 2 independently selected from alkyl or alkoxy groups having 1 to 12 carbon atoms or alkenyl groups having 2 to 12 carbon atoms, and in the compounds of the general formula (1) and the compounds of the general formula (2), R 1 or R 2 The 2, 3, 5, and 6 carbon atoms on the adjacent benzene rings can be replaced by nitrogen atoms, and any H atom on the benzene ring can be replaced by F;

[0010] The compound of general formula (3) is: Among them, R 3 is selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and in the compound of the general formula (3), 3 The 2, 3, 5, and 6 carbon atoms on the adjacent benzene rings can be replaced by nitrogen atoms, and any carbon atom on the cyclohexane ring can be replaced by an oxygen atom;

[0011] The compound of general formula (4) is: Among them, R 4 It is selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, D represents a cyclohexane ring or a benzene ring, any H atom on D may be replaced by F, n=0 or 1, and when n=1 and D is a cyclohexane ring, the 2, 3, 5, 6 carbon atoms on D may be replaced by oxygen atoms.

[0012] In some embodiments, the mass percentage of the compound of general formula (1) in the total mass of the liquid crystal composition is 1% to 95%; the mass percentage of the compound of general formula (2) in the total mass of the liquid crystal composition is 1% to 95%; the mass percentage of the compound of general formula (3) in the total mass of the liquid crystal composition is 1% to 65%; the mass percentage of the compound of general formula (4) in the total mass of the liquid crystal composition is 1% to 65%.

[0013] Preferably, the mass percentage of the compound of general formula (1) in the total mass of the liquid crystal composition is 1% to 75%; the mass percentage of the compound of general formula (2) in the total mass of the liquid crystal composition is 1% to 90%; the mass percentage of the compound of general formula (3) in the total mass of the liquid crystal composition is 1% to 55%; the mass percentage of the compound of general formula (4) in the total mass of the liquid crystal composition is 1% to 50%.

[0014] Preferably, the mass percentage of the compound of general formula (1) in the total mass of the liquid crystal composition is 1% to 65%; the mass percentage of the compound of general formula (2) in the total mass of the liquid crystal composition is 40% to 80%; the mass percentage of the compound of general formula (3) in the total mass of the liquid crystal composition is 1% to 45%; the mass percentage of the compound of general formula (4) in the total mass of the liquid crystal composition is 1% to 40%.

[0015] In some embodiments, R 1 , R 2 , R 3 , R 4 Each is independently selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.

[0016] In some embodiments, the compound of formula (1) is selected from one or more of the following compounds:

[0017]

[0018] In some embodiments, the compound of formula (2) is selected from one or more of the following compounds:

[0019]

[0020]

[0021] In some embodiments, the compound of formula (3) is selected from one or more of the following compounds:

[0022]

[0023]

[0024] Preferably, the compound of formula (4) is selected from one or more of the following compounds:

[0025]

[0026]

[0027] In some embodiments, the liquid crystal compound further includes at least one of an anti-ultraviolet agent, an antioxidant, and a chiral agent.

[0028] The embodiment of the present application also provides a liquid crystal optical element, which is made of the above-mentioned liquid crystal composition.

[0029] The liquid crystal composition provided by the present application has a higher diffraction efficiency, and at the same time as the high diffraction efficiency, the transmittance is not reduced, achieving the purpose of improving the diffraction efficiency while ensuring the stability of other parameters of the liquid crystal compound. In addition, the liquid crystal composition provided by the present application has a higher phase transition temperature when the nematic phase is transformed into the isotropic phase, and a wider nematic term temperature width, so the liquid crystal compound can have a larger operating temperature width when applied to a liquid crystal optical element.

[0030] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In related studies, it was found that the field of view (VOP) of the grating can be effectively improved by reducing the thickness of the polymer dispersed liquid crystal structure. However, when the thickness of the structure is reduced, the diffraction efficiency of the grating will be significantly reduced. Some studies also mentioned that the diffraction efficiency can be increased by increasing the refractive index difference between the liquid crystal material and the polymer material, but doing so will easily cause the scattering of the grating to increase and the transmittance to decrease.

[0033] The present application provides a liquid crystal composition, which includes at least one compound of the general formula (1), at least one compound of the general formula (2), at least one compound of the general formula (3), and at least one compound of the general formula (4).

[0034] That is, the liquid crystal composition includes the compound of formula (1), the compound of formula (2), the compound of formula (3) and the compound of formula (4) at the same time. It should be noted that the compound of formula (1) included in the liquid crystal composition can be one or more, and similarly, the compound of formula (2) can be one or more; the compound of formula (3) can be one or more; and the compound of formula (4) can be one or more. It can be understood that in the present application, multiple means two or more, that is, at least two.

[0035] The compound of general formula (1) is:

[0036] Among them, R 1 is selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and in the compound of the general formula (1) and the compound of the general formula (2), R 1 The 2, 3, 5, and 6 carbon atoms on the adjacent benzene rings may be replaced by nitrogen (N) atoms, and any H (hydrogen) atom on the benzene ring may be replaced by F (fluorine). It is understood that when the F atom replaces the H atom, it may be either a single substitution or a multiple substitution, which is not limited here. In the present application, the 2, 3, 5, and 6 carbon atoms on the benzene ring refer to the other carbon atoms on the benzene ring except the para-substituted group.

[0037] In some embodiments, R 1 It can be selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms. 1 The shorter the chain length, the more effectively the molecular polarity can be reduced and the more refractive index can be increased. 1 Alkyl and alkoxy groups are preferred, which can reduce the degree of unsaturation in the liquid crystal composition and improve the stability of the molecules to ultraviolet rays and heat.

[0038] The mass percentage of the compound of formula (1) in the total mass of the liquid crystal composition can be, for example, 1%-95%, for example, the mass ratio of the compound of formula (1) in the liquid crystal composition can be 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, 90%, 95%, etc. Preferably, the mass percentage of the compound of formula (1) in the total mass of the liquid crystal composition can be controlled to be 1%-75%, for example, 8%, 12%, 25%, 28%, 35%, 45%, 50%, 55%, 60%, 70%, 73%, etc., which is not limited here. By controlling the proportion of the compound of formula (1) in the liquid crystal composition, the birefringence of the liquid crystal composition can be more accurately controlled, thereby obtaining a liquid crystal composition that better meets the requirements. More preferably, the mass percentage of the compound of general formula (1) in the total mass of the liquid crystal composition can be controlled to be 1%-65%, for example, 1%-10%, 1%-25%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc., which is not limited here.

[0039] Exemplarily, as shown below, the present application shows the specific molecular structures of some compounds of the general formula (1), and one or more of the following compounds can be selected from the liquid crystal compound:

[0040]

[0041]

[0042] It is understood that the various compounds described above are only exemplary and should not be construed as limiting the compounds of general formula (1). Among them, the compounds of general formula (1) shown above, due to their short chain length and small number of rings, when one or more of them are added to the liquid crystal composition, are beneficial to improving the diffraction efficiency of the liquid crystal composition.

[0043] The compound of general formula (2) is:

[0044] Among them, R 2 is selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and in the compound of the general formula (1) and the compound of the general formula (2), R 2 The 2, 3, 5, and 6 carbon atoms on the adjacent benzene rings may be replaced by nitrogen atoms, and any H atom on the benzene ring may be replaced by F. It is understood that when F atoms replace H atoms, it may be either a single substitution or a multiple substitution, which is not limited here.

[0045] In some embodiments, R 2 It can be selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms. 1 The shorter the chain length, the more effectively the molecular polarity can be reduced and the more refractive index can be increased. 2 Alkyl and alkoxy groups are preferred, which can reduce the degree of unsaturation in the liquid crystal composition and improve the stability of the molecules to ultraviolet rays and heat.

[0046] The mass percentage of the compound of formula (2) in the total mass of the liquid crystal composition can be, for example, 1%-95%, for example, the mass ratio of the compound of formula (2) in the liquid crystal composition can be 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc. Preferably, the mass percentage of the compound of formula (2) in the total mass of the liquid crystal composition can be controlled to be 10%-90%, for example, 10%, 12%, 25%, 28%, 35%, 45%, 50%, 55%, 62%, 68%, 78%, 82%, 88%, etc., which is not limited here. By controlling the proportion of the compound of formula (2) in the liquid crystal composition, the birefringence of the liquid crystal composition can be more accurately controlled, thereby obtaining a liquid crystal composition that better meets the requirements. More preferably, the mass percentage of the compound of general formula (2) in the total mass of the liquid crystal composition can be controlled to be 40%-80%, for example, 40%-50%, 40%-60%, 50%-60%, 60%-80%, 50%-70%, 70%-80%, etc., which is not limited here.

[0047] Exemplarily, as shown below, the present application shows the specific molecular structures of some compounds of the general formula (2), and one or more of the following compounds can be selected from the liquid crystal compound:

[0048]

[0049]

[0050] When one or more compounds of the general formula (2) are added into a liquid crystal composition, it is beneficial to improve the diffraction efficiency of the liquid crystal composition.

[0051] It is to be understood that the various compounds mentioned above are merely exemplary and should not be construed as limiting the compounds of the general formula (2).

[0052] The compound of general formula (3) is:

[0053] R 3 is selected from an alkyl group or an alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, wherein the compound of the general formula (3) and R 3 The 2, 3, 5, and 6 carbon atoms on the adjacent benzene rings may be replaced by nitrogen atoms. It is understood that when N atoms replace C atoms, it may be either monosubstituted or polysubstituted, and is not limited here. At the same time, any carbon (C) atom on the cyclohexane ring may be replaced by oxygen (O) atoms, wherein O may replace C atoms as monosubstituted, disubstituted, or polysubstituted. Preferably, O may replace C atoms as monosubstituted or disubstituted.

[0054] In some embodiments, R 3 It can be selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms. 3 The shorter the chain length, the more effectively the molecular polarity can be reduced and the more refractive index can be increased. 3 Alkyl and alkoxy groups are preferred, which can reduce the degree of unsaturation in the liquid crystal composition and improve the stability of the molecules to ultraviolet rays and heat.

[0055] The mass percentage of the compound of formula (3) in the total mass of the liquid crystal composition can be, for example, 1%-65%, for example, the mass ratio of the compound of formula (3) in the liquid crystal composition can be 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 65%, etc. Preferably, the mass percentage of the compound of formula (3) in the total mass of the liquid crystal composition can be controlled to be 1%-55%, for example, 8%, 12%, 25%, 28%, 35%, 45%, 50%, 55%, etc., which are not limited here. By controlling the proportion of the compound of formula (3) in the liquid crystal composition, the birefringence of the liquid crystal composition can be more accurately controlled, thereby obtaining a liquid crystal composition that better meets the requirements. More preferably, the mass percentage of the compound of formula (3) in the total mass of the liquid crystal composition can be controlled to be 1%-45%, for example, 1%-10%, 1%-25%, 35%, 40%, 45%, etc., which are not limited here.

[0056] Exemplarily, as shown below, the present application shows the specific molecular structures of some compounds of the general formula (3), and one or more of the following compounds can be selected from the liquid crystal compound:

[0057]

[0058]

[0059] When one or more compounds of the general formula (3) are added to the liquid crystal composition, it is beneficial to improve the diffraction efficiency of the liquid crystal composition. It is understood that the various compounds mentioned above are only exemplary and should not be construed as limiting the compounds of the general formula (3).

[0060] The compound of general formula (4) is: Among them, R 4 is selected from an alkyl or alkoxy group of 1 to 12 carbon atoms or an alkenyl group of 2 to 12 carbon atoms. In some embodiments, R 1 It can be selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms. 4 The shorter the chain length, the more effectively the molecular polarity can be reduced and the more refractive index can be increased. 4 Alkyl and alkoxy groups are preferred, which can reduce the degree of unsaturation in the liquid crystal composition and improve the stability of the molecules to ultraviolet rays and heat.

[0061] D represents a cyclohexane ring or a benzene ring, any H atom on D may be replaced by F, n=0 or 1, and when n=1 and D is a cyclohexane ring, the 2, 3, 5, 6 carbon atoms on D may be replaced by oxygen atoms. Wherein, when O replaces a C atom, it may be a single substitution, a double substitution or a multiple substitution, preferably, when O replaces a C atom, it may be a single substitution or a double substitution.

[0062] The mass percentage of the compound of formula (4) in the total mass of the liquid crystal composition can be, for example, 1%-65%, for example, the mass ratio of the compound of formula (4) in the liquid crystal composition can be 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 65%, etc. Preferably, the mass percentage of the compound of formula (4) in the total mass of the liquid crystal composition can be controlled to be 1%-50%, for example, 8%, 12%, 25%, 28%, 35%, 45%, 50%, etc., which is not limited here. By controlling the proportion of the compound of formula (4) in the liquid crystal composition, the birefringence of the liquid crystal composition can be more accurately controlled, thereby obtaining a liquid crystal composition that better meets the requirements. More preferably, the mass percentage of the compound of formula (4) in the total mass of the liquid crystal composition can be controlled to be 1%-40%, for example, 1%-10%, 1%-25%, 35%, 40%, etc., which is not limited here.

[0063] Exemplarily, as shown below, the present application shows the specific molecular structures of some compounds of the general formula (4), and one or more of the following compounds can be selected from the liquid crystal compound:

[0064]

[0065]

[0066]

[0067] When one or more compounds of the general formula (4) are added to the liquid crystal composition, it is beneficial to improve the diffraction efficiency of the liquid crystal composition. It is understood that the various compounds mentioned above are only exemplary and should not be construed as limiting the compounds of the general formula (4).

[0068] It should be noted that the above-mentioned compound of general formula (1) can be combined with any one or more compounds of general formula (2) and any one or more compounds of general formula (3) and any one or more compounds of general formula (4) to obtain a liquid crystal composition, which is not limited here.

[0069] In some more specific embodiments, the mass percentage ratio between the compound of general formula (1), the compound of general formula (2), the compound of general formula (3) and the compound of general formula (4) can be (3-4): (3-4): (1-2): (1-2), wherein the mass percentage ratio between the compound of general formula (2), the compound of general formula (3) and the compound of general formula (4) can be (3-4): (1-2): (1-2). Under this ratio, the diffraction efficiency of the obtained liquid crystal composition can be improved by about 10%, and it has a good application prospect.

[0070] In some embodiments, other additives may also be included in the liquid crystal composition, and the additives may be, for example, anti-ultraviolet agents, antioxidants, chiral agents, etc. In addition, the liquid crystal compound may also include antistatic agents or defoamers, etc., which are not limited here. Wherein the anti-ultraviolet agent may be, for example, benzophenones and benzotriazole compounds, and the antioxidant may be, for example, BHA (butylated hydroxyanisole), BHT (butylated hydroxytoluene), TBHQ (tert-butyl hydroquinone), etc. The chiral agent may be, for example, oxazolidinone, 8-phenyl menthol, etc. The defoamer may be, for example, a polysiloxane defoamer, ethylene oxide, propylene oxide, etc. The antistatic agent may be, for example, ethoxylated aliphatic alkylamines, sodium alkyl sulfonates, etc.

[0071] The mass percentage of the additive added to the total mass of the liquid crystal composition is preferably less than or equal to 1%, and the amount and type of the additive added do not affect the properties of the liquid crystal composition.

[0072] The liquid crystal composition proposed in this application is specifically introduced below through examples.

[0073] The liquid crystal composition provided by the present invention can be prepared by using the known technology in the art, for example, it can be prepared by the following method: the components in the liquid crystal composition are mixed uniformly by stirring or ultrasonic mixing. The liquid crystal composition in the following examples is obtained by stirring and mixing to obtain a homogeneous composition, and then its physical and chemical properties are tested. For the convenience of explanation, the group structure of the liquid crystal composition in the following examples and comparative examples is represented by the code shown in Table 1:

[0074] Table 1 Code comparison table of each group structure

[0075]

[0076] Take the following compound as an example:

[0077]

[0078] From left to right, the chemical formula is represented by the above codes and can be expressed as PP-5-N.

[0079] As shown in Table 2, the codes and composition ratios of the liquid crystal compositions in each embodiment are specifically shown below:

[0080] Table 2 Composition of liquid crystal compositions in various embodiments and comparative examples

[0081]

[0082]

[0083] The liquid crystal compositions obtained in Examples 1-6 and Comparative Example 1 were tested to measure the following parameters:

[0084] Tni (°C) represents the temperature at which the nematic phase transforms into the isotropic phase and is also expressed as the clearing point temperature;

[0085] Δn represents the refractive index of optical anisotropy at a wavelength of 589 nm at 20°C;

[0086] n o represents the refractive index of ordinary light in liquid crystal;

[0087] n e represents the refractive index of extraordinary light in liquid crystal;

[0088] T represents transmittance, T=(I d +I t ) / I 0 ;

[0089] η represents the relative diffraction efficiency, η=Id / (I d +I t )I d is the diffracted light intensity, I t is the transmitted light intensity, I 0 is the light intensity of the light source.

[0090] The measured data are shown in Table 3:

[0091]

[0092] Table 3 Measurement results of Examples 1-6 and Comparative Example 1

[0093] Comparing the liquid crystal compositions obtained in Examples 1-6 with Comparative Example 1, it can be seen from the data in Table 3 that Δn is increased from 0.26 to about 0.29, and the corresponding relative diffraction efficiency is increased from 70% to about 80%, an increase of 10%. At the same time, the transmittance of the liquid crystal compositions obtained in Examples 1-6 is not significantly reduced compared with Comparative Example 1, and is almost the same as that of the Comparative Example. It can be seen that this embodiment can improve the relative diffraction efficiency without reducing the transmittance.

[0094] At the same time, compared with the comparative example 1 in the prior art, the liquid crystal compositions obtained in Examples 1-6 have a nematic phase temperature range Tni of more than 100°C, which is wider than the nematic phase temperature width of the conventional liquid crystal composition comparative example, and have superiority and excellent effects in practical applications. In summary, the liquid crystal compositions obtained in the embodiments of the present application can improve the relative diffraction efficiency without reducing the transmittance.

[0095] One of the uses of the above-mentioned liquid crystal composition is to make a liquid crystal optical element, wherein the liquid crystal optical element can be a liquid crystal lens to provide the liquid crystal lens with good electrical control characteristics. The liquid crystal optical device can also be a phase modulator, a holographic polymer dispersed liquid crystal grating (HPDLC), a polymer dispersed liquid crystal (PDLC) dimming element, etc., which are not limited here.

[0096] The present application also provides a liquid crystal optical element, which is made of the above-mentioned liquid crystal composition.

[0097] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid crystal composition, characterized in that: include: At least one of the compounds of formula (1); as well as At least one of the compounds of formula (2); as well as At least one of the compounds of formula (3); as well as At least one of the compounds of formula (4); The compound of general formula (1) is: The compound of general formula (2) is: Wherein, R1 and R2 are independently selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and in the compound of the general formula (1) and the compound of the general formula (2), the 2, 3, 5, and 6 carbon atoms on the benzene ring adjacent to R1 and R2 may be replaced by nitrogen atoms, and any H atom on the benzene ring may be replaced by F; The compound of general formula (3) is: wherein R3 is selected from an alkyl or alkoxy group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms, and in the compound of the general formula (3), the 2, 3, 5, and 6 carbon atoms on the benzene rings alternately with R3 may be replaced by nitrogen atoms, and any carbon atom on the cyclohexane ring may be replaced by an oxygen atom; The compound of general formula (4) is selected from One or more of; The mass percentage of the compound of general formula (1) in the total mass of the liquid crystal composition is 45% to 50%; The mass percentage of the compound of general formula (2) in the total mass of the liquid crystal composition is 28% to 30%; The mass percentage of the compound of general formula (3) in the total mass of the liquid crystal composition is 10% to 20%; The mass percentage of the compound of general formula (4) in the total mass of the liquid crystal composition is 8% to 10%.

2. The liquid crystal composition according to claim 1, characterized in that: R1, R2, R3, and R4 are independently selected from an alkyl or alkoxy group having 1 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.

3. The liquid crystal composition according to claim 1, characterized in that: The compound of general formula (1) is selected from one or more of the following compounds:

4. The liquid crystal composition according to claim 1, characterized in that: The compound of general formula (2) is selected from one or more of the following compounds:

5. A liquid crystal optical element, characterized in that: The liquid crystal optical element is made of the liquid crystal composition according to any one of claims 1 to 4.

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