A liquid crystal composition and a liquid crystal display device

Abstract

The application relates to the technical field of liquid crystal display, and particularly discloses a liquid crystal composition and a liquid crystal display device. The liquid crystal composition has the advantages of good reliability after long-time high-temperature and high-humidity aging, small refractive index change under different wavelengths of light, and small dispersion under different wavelengths of light; in addition, the display device containing the liquid crystal composition has the advantages of good reliability after long-time high-temperature and high-humidity aging, small dispersion under different wavelengths of light, and high transmittance, and can be used in liquid crystal display devices with high-temperature and high-humidity resistance, high transmittance and contrast ratio, and is particularly suitable for IPS and FFS mode liquid crystal display devices.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display technology, and more specifically, to a liquid crystal composition and a liquid crystal display device. Background Technology

[0002] In the field of display materials, compared with OLED (Organic Light Emitting Diode) technology, liquid crystal display (LCD) technology has significant advantages in terms of process, cost, and stability, and currently holds a relatively large advantage in the global display market. Meanwhile, to meet market and consumer demands, LCD technology is constantly undergoing upgrades and innovations, such as the combination with MiniLED and quantum dot technologies, which has resulted in a qualitative improvement in the contrast and image quality of LCD displays.

[0003] In terms of application expansion, the demand for LCDs extends beyond consumer electronics (TVs, mobile phones, etc.) to include industrial, medical, and automotive sectors. When LCDs are used in outdoor digital signage, industrial control, and intelligent transportation, high temperature and humidity environments pose significant challenges to their performance and lifespan. Firstly, these application environments are characterized by large temperature differences and high humidity. For example, the internal temperature of the enclosure can exceed 60°C under direct sunlight, while humidity during the rainy season often reaches over 80%, far exceeding the tolerance range of ordinary LCD screens (typically 0-50°C). This environment accelerates the disordered arrangement of liquid crystal molecules, leading to malfunctions such as blackouts and brightness decay. Secondly, industrial-grade displays used in construction sites, logistics centers, and other similar environments must meet requirements such as high brightness (above 1000 nits), strong protection (IP65 / IP67), and wide operating temperature (-20°C to 60°C). These requirements place higher demands on the high temperature and humidity resistance of LCDs.

[0004] Currently, LCD monitors are developing towards thinner, lighter, lower power consumption, wider viewing angles, higher contrast ratios, and faster response times, with the demand for higher contrast ratios being particularly urgent. Research has found that increasing the transmittance of liquid crystals greatly helps improve the contrast ratio of LCD monitors. Generally, increasing transmittance is achieved by increasing the refractive index of the liquid crystal, thereby increasing the retardation and thus improving transmittance. However, since different wavelengths of light have different transmittances through liquid crystal materials, and the greater the refractive index dispersion of the liquid crystal material, the lower the transmittance, this limits the improvement of liquid crystal transmittance. To further improve the transmittance of liquid crystals, it is necessary to address the problem of significant differences in dispersion of liquid crystals under different wavelengths of light. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a liquid crystal composition and a liquid crystal display device, thereby solving at least one of the aforementioned technical problems. The liquid crystal composition provided by the present invention has advantages such as good reliability after prolonged high-temperature and high-humidity aging, small refractive index change at different wavelengths, and low dispersion under different wavelengths of light. The liquid crystal display device containing this liquid crystal composition also has advantages such as good reliability after prolonged high-temperature and high-humidity aging, low dispersion under different wavelengths of light, and high transmittance. It can be used in liquid crystal display devices with high temperature and humidity resistance, high transmittance, and high contrast, and is particularly suitable for IPS and FFS mode liquid crystal display devices.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, the present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises one or more compounds represented by Formula I: I; Wherein, R1 represents an alkyl group having 1-12 carbon atoms, an alkoxy group having 1-12 carbon atoms, an alkenyl group having 2-12 carbon atoms, or an alkenyloxy group having 2-12 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by cyclopentylene, cyclopentenylene, cyclobutylene, or cyclopropylene. X1 represents F, alkyl with 1-12 carbon atoms, alkoxy with 1-12 carbon atoms, alkenyl with 2-12 carbon atoms, fluoroalkyl with 1-5 carbon atoms, fluoroalkoxy with 1-5 carbon atoms, fluoroalkenyl with 2-5 carbon atoms, or fluoroalkenyloxy with 2-5 carbon atoms.

[0007] In a second aspect, the present invention provides a liquid crystal display device comprising the liquid crystal composition described in the first aspect above.

[0008] The beneficial effects of this invention are as follows: The liquid crystal composition containing the compound shown in Formula I provided by this invention has the advantages of good reliability after long-term high temperature and high humidity aging, small refractive index change under different wavelengths of light, and small dispersion under different wavelengths of light. The liquid crystal display device containing the liquid crystal composition also has the advantages of good reliability after long-term high temperature and high humidity aging, small dispersion under different wavelengths of light, and high transmittance. It can be used for liquid crystal display devices with high temperature and high humidity resistance, high transmittance and contrast, and is especially suitable for IPS and FFS mode liquid crystal display devices. Detailed Implementation

[0009] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0010] According to a specific embodiment of the present invention, a liquid crystal composition is provided, characterized in that the liquid crystal composition comprises at least one compound represented by Formula I: I; Wherein, R1 represents an alkyl group having 1-12 carbon atoms, an alkoxy group having 1-12 carbon atoms, an alkenyl group having 2-12 carbon atoms, or an alkenyloxy group having 2-12 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by cyclopentylene, cyclopentenylene, cyclobutylene, or cyclopropylene. X1 represents F, alkyl with 1-12 carbon atoms, alkoxy with 1-12 carbon atoms, alkenyl with 2-12 carbon atoms, fluoroalkyl with 1-5 carbon atoms, fluoroalkoxy with 1-5 carbon atoms, fluoroalkenyl with 2-5 carbon atoms, or fluoroalkenyloxy with 2-5 carbon atoms.

[0011] In some preferred examples, R1 represents an alkyl group having 1-8 carbon atoms, an alkoxy group having 1-8 carbon atoms, an alkenyl group having 2-8 carbon atoms, or an alkenoxy group having 2-8 carbon atoms.

[0012] In some preferred examples, X1 represents F, an alkyl group having 1-8 carbon atoms, an alkoxy group having 1-8 carbon atoms, an alkenyl group having 2-8 carbon atoms, a fluoroalkyl group having 1-3 carbon atoms, a fluoroalkoxy group having 1-3 carbon atoms, a fluoroalkenyl group having 2-4 carbon atoms, or a fluoroalkenyloxy group having 2-4 carbon atoms.

[0013] In some examples, the compound represented by Formula I is selected from at least one of the compounds represented by Formulas I-1 to I-4: I-1; I-2; I-3; I-4; Among them, R 11 X represents an alkenyl group with 2-6 carbon atoms. 11 R represents an alkyl group having 1-6 carbon atoms or an alkenyl group having 2-6 carbon atoms. 12 X represents an alkyl group having 1-6 carbon atoms or an alkoxy group having 1-6 carbon atoms. 12 R represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms. 13 It indicates an alkyl group having 1-6 carbon atoms or an alkenyl group having 2-6 carbon atoms.

[0014] In some more specific examples, the compound represented by Formula I is selected from at least one of the following compounds: I-1-1、 I-1-2、 I-1-3、 I-1-4、 I-1-5、 I-2-1、 I-2-2、 I-2-3、 I-2-4、 I-2-5、 I-2-6、 I-2-7 I-2-8、 I-2-9、 I-2-10 I-3-1、 I-3-2、 I-3-3、 I-3-4、 I-3-5、 I-3-6、 I-3-7 I-3-8、 I-4-1、 I-4-2、 I-4-3、 I-4-4、 I-4-5、 I-4-6、 I-4-7 I-4-8.

[0015] In some specific examples, the content of the compound represented by Formula I in the liquid crystal composition, by mass percentage, includes, but is not limited to, 2-30%, 3-30%, 3%-26%, 3%-19%, 3%-17%, 3%-10%, or 3%-8%.

[0016] In some examples, the liquid crystal composition further comprises at least one compound represented by Formula II: II; in, express or , One or more H atoms can be replaced by F; express , or ; R2 represents an alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms, wherein any one or more unattached -CH2- groups can be replaced by -O-, , or Substitute; Z1 represents -CO-O-, -CH2O-, or a single bond; X2 represents F, CN, CF3, or OCF3; m1 represents 1, 2, or 3; When m1 represents 2 or 3 Same or different, Z1 is the same or different.

[0017] In some examples, the liquid crystal composition further comprises at least one compound represented by Formula III: III; Among them, R3 and R 3a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms.

[0018] In some more specific examples, the compound represented by Formula II is selected from at least one of the following compounds: II-1 II-2, II-3 II-4 II-5 II-6 II-7 II-8 II-9.

[0019] In some specific examples, the content of the compound represented by Formula II in the liquid crystal composition, by mass percentage, includes, but is not limited to, 0~20%, 0~15.5%, 0~6.5%, 2.5%~20%, 2.5%~15.5%, 3~15.5%, 3~11%, or 2.5~6.5%.

[0020] In some more specific examples, the compound represented by Formula III is selected from at least one of the following compounds: III-1 III-2, III-3, III-4 III-5 III-6 III-7 III-8 III-9 III-10.

[0021] In some specific examples, the content of the compound represented by Formula III in the liquid crystal composition, by mass percentage, includes, but is not limited to, 0~20%, 2~20%, 3~20%, 2~15%, 3~15%, or 2~10%.

[0022] In some examples, the liquid crystal composition further comprises at least one compound of formula IV, said compound IV being selected from the family consisting of compounds of formulas IV-1 and IV-2: IV-1; IV-2; Among them, R4 and R 4a Each of these can independently represent an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkenyloxy group having 2-10 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by cyclopentylene, cyclopentenylene, cyclobutylene, or cyclopropylene. , , and Each represents independently , , , , or ; m2 represents 1 or 2. When m2 represents 2, Same or different.

[0023] In some more specific examples, the compound represented by Formula IV-1 is selected from at least one of the following compounds: IV-1-1、 IV-1-2, IV-1-3, IV-1-4 IV-1-5, IV-1-6 IV-1-7 IV-1-8.

[0024] In some more specific examples, the compound represented by Formula IV-2 is selected from at least one of the following compounds: IV-2-1 IV-2-2, IV-2-3.

[0025] In some specific examples, the content of the compound represented by Formula IV in the liquid crystal composition, by mass percentage, includes, but is not limited to, 3%~30%, 5%~30%, 5%~25%, 7%~24.5%, 7%~22.5%, 7%~18%, or 7%~17%.

[0026] In some examples, the liquid crystal composition further comprises at least one compound represented by formula V: V; Among them, R5, R 5a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms.

[0027] In some more specific examples, the compound represented by formula V is selected from at least one of the following compounds: V-1, V-2, V-3 V-4 V-5 V-6.

[0028] In some examples, the content of the compound represented by Formula V in the liquid crystal composition, by mass percentage, includes, but is not limited to, 0~30%, 0~25%, 0~20%, 2~30%, 2~25%, 2~20%, 5~20%, 6~20%, or 5~14%.

[0029] In some examples, the liquid crystal composition further comprises at least one compound of formula VI: VI; Wherein, R6 represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms, wherein any one or more unattached -CH2- groups can be replaced by -O- groups, , or Substitute; R 6a and R 6b Each can independently represent H, F, alkyl with 1-6 carbon atoms, alkoxy with 1-6 carbon atoms, or alkenyl with 2-6 carbon atoms; express or .

[0030] In some specific examples, the compound represented by Formula VI is selected from one or more of the following compounds: VI-1 VI-2 VI-3 VI-4 VI-5 VI-6 VI-7 VI-8 VI-9 VI-10 VI-11 VI-12 VI-13 VI-14 VI-15 VI-16 VI-17 VI-18 VI-19 VI-20 VI-21 VI-22 VI-23 VI-24.

[0031] In some specific examples, the content of the compound represented by Formula VI in the liquid crystal composition, by mass percentage, includes, but is not limited to, 0~30%, 0~25%, 0~20%, 0~11%, 2~25%, 2~20%, 5.5~20%, 5.5~15%, 5.5~11%, or 0~5.5%.

[0032] In some examples, the liquid crystal composition further comprises at least one compound represented by formula VII: VII; in, express , , or ; R7, R 7a Each can independently represent an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms; Z2 represents -CH2-CH2-, -CO-O-, -CH2O-, -CH=CH-, -C≡C-, or a single bond; m3 represents 1, 2, or 3; When m3 represents 2 or 3 Same or different, Z3 is the same or different.

[0033] In some specific examples, the compound represented by Formula VII is selected from one or more of the following compounds: VII-1 VII-2 VII-3 VII-4 VII-5 VII-6 VII-7 VII-7 VII-9 VII-10 VII-11 VII-12.

[0034] For example, the content of the compound represented by Formula VII in the liquid crystal composition, by mass percentage, includes, but is not limited to, 30-60%, 35-60%, 40-60%, 40-55%, 40.5-54%, 40.5-53.5%, 44-54%, or 44-53.5%.

[0035] In some examples, the liquid crystal composition further comprises at least one compound represented by formula VIII: VIII; in, express , or ,in At most one H atom can be replaced by F; R8, R 8a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, an alkenyl group having 2-6 carbon atoms, or an alkenyloxy group having 2-6 carbon atoms; Z3 represents -CH2-CH2-, -CO-O-, -CH2O-, -CH=CH-, -C≡C-, or a single bond; m4 represents 1 or 2; When m4 represents 2 Same or different.

[0036] In some specific examples, the compound represented by formula VIII is selected from the group consisting of the following compounds: VIII-1 VIII-2, VIII-3 VIII-4 VIII-5 VIII-6 VIII-7 VIII-8 VIII-9 VIII-10 VIII-11, VIII-12 VIII-13.

[0037] For example, the content of the compound represented by Formula VIII in the liquid crystal composition, by mass percentage, includes, but is not limited to, 0-10%, 0-8%, 0-5%, 0-4%, or 0-2%.

[0038] In some examples, the alkyl group is a straight-chain or branched alkyl group.

[0039] In some examples, the alkoxy group is a straight-chain or branched alkoxy group.

[0040] In some examples, the alkenyl group is a straight-chain or branched alkenyl group.

[0041] Various functional additives can be added to the liquid crystal compound provided in this embodiment. The mass percentage of each additive is relative to the total mass of all liquid crystal compounds excluding the additives. The mass percentage of exemplary additives is preferably between 0.01% and 2%. These additives are mainly chiral agents, antioxidants, light stabilizers, ultraviolet absorbers, polymerizable monomers, self-aligning agents, etc.

[0042] Exemplary antioxidant and light stabilizer additives are selected from the following compounds:

[0043]

[0044] Exemplary UV absorber additives are selected from the following compounds:

[0045] Exemplary polymerizable monomer additives are selected from the following compounds:

[0046]

[0047] .

[0048] According to another specific embodiment of the present invention, a liquid crystal display device is provided, the liquid crystal display device comprising the liquid crystal composition described above.

[0049] In some examples, the liquid crystal display device is a VA, IPS, or FFS mode display.

[0050] In this invention, the elements contained in the compounds include all their corresponding isotopes, such as compounds in which H, C, N, O, Cl, F, S, Se, etc. have been replaced by their corresponding isotopes, and this is particularly preferred in some embodiments.

[0051] The technical solution of the present invention will be described below with reference to some specific embodiments: Unless otherwise specified, percentages in this instruction manual refer to mass percentages, and temperatures are in degrees Celsius (°C). The specific meanings of other symbols and test conditions are as follows: Cp represents the liquid crystal clearing point (°C), measured by DSC quantitative method; Δn represents optical anisotropy, no is the refractive index of ordinary light, ne is the refractive index of extraordinary light, the test conditions are 25±2℃, Δn(450) is Δn measured at a wavelength of 450nm, Δn(546) is Δn measured at a wavelength of 546nm, Δn(589) is Δn measured at a wavelength of 589nm, Δn(680) is Δn measured at a wavelength of 680nm, and the test is performed using an Abbe refractometer. When the refractive index of the liquid crystal changes little with wavelength, the difference in the refraction angle of light of different wavelengths when passing through the liquid crystal is small, so the dispersion effect is weak. In other words, the more gradual the change of refractive index with wavelength, the less obvious the dispersion phenomenon, and the higher the transmittance of the liquid crystal will be.

[0052] Δε represents dielectric anisotropy, Δε = ε ∥ -ε ⊥ , where ε ∥ ε is the dielectric constant parallel to the molecular axis. ⊥ The dielectric constant is perpendicular to the molecular axis. The test conditions are 25±0.5℃, 20-micron vertical / parallel cell, INSTEC: ALCT-IR1 test. K 11 K is the elastic constant of the development. 33 The bending elastic constant was determined under the following test conditions: 25℃, INSTEC:ALCT-IR1, and 20-micron vertical / parallel box. γ1 represents rotational viscosity (mPa·s), and the test conditions are 25±0.5℃, 20-micron vertical / parallel box, INSTEC: ALCT-IR1 test; VHR represents voltage hold-up rate (%). The test conditions were 60±2℃, voltage ±1V, pulse width 10ms, and voltage hold-up time 166.7ms. The test equipment was a TOYO Model 6254 LCD performance comprehensive tester. High temperature and high humidity aging test conditions: The ability to resist high temperature and high humidity aging is examined by testing the change in VHR data of the liquid crystal composition under high temperature of 85°C and high humidity of 85%. The test box filled with liquid crystal composition is placed in a high temperature and high humidity oven at 85°C and 85% relative humidity for 500 hours, and the VHR is tested at the initial stage and after aging.

[0053] In this invention, the VHR is evaluated after high temperature and high humidity aging as follows: After aging, 0 < ΔVHR < 1 indicates a slight improvement, 1 ≤ ΔVHR ≤ 2 indicates a more significant improvement, and ΔVHR > 2 indicates a significant improvement. Here, ΔVHR is the difference between the VHR of the example after high temperature and high humidity and the VHR of the comparative example after high temperature and high humidity.

[0054] The preparation method of the liquid crystal composition is as follows: Weigh each liquid crystal monomer according to a certain ratio and put it into a stainless steel beaker. Place the stainless steel beaker containing each liquid crystal monomer on a magnetic stirrer and heat it to melt. After most of the liquid crystal monomer in the stainless steel beaker has melted, add a magnetic rotor to the stainless steel beaker and stir the mixture evenly. After cooling to room temperature, the liquid crystal composition is obtained.

[0055] Example: The liquid crystal monomer structure in the embodiments of the present invention is represented by code. The code representation methods of liquid crystal ring structure, end group and linking group are shown in Table 1 and Table 2 below.

[0056] Table 1. Corresponding codes for ring structures

[0057] Table 2. Correspondence codes between terminal groups and linking groups

[0058] For example: Its code is CC-Cp-V1; Its code is CCP-V2-1; Its code is PGP-Cpr1-2; Its code is CPY-2-O2; Its code is CCY-3-O2; Its code is COY-3-O2; Its code is CCOY-3-O2; Its code is Sb-CpO-O4; Its code is Sc-CpO-O4; Its code is CCU-3-F; Its code is PGU-3-F; Its code is CCPU-3-F; Its code is CPGU-3-OT; Its code is DGUQU-4-F; Its code is PGUQU-3-F; Its code is PPGU-Cp-F; Its code is PUS(1)-3-1; Its code is CLP-3-T; Its code is CLIP-3-T.

[0059] Comparative Examples 1-2 and Examples 1-2 Liquid crystal compositions of Comparative Example 1, Example 1, Comparative Example 2 and Example 2 were prepared according to the compounds listed in Tables 3 and 4 and their corresponding mass percentages, respectively, and were filled into the corresponding test boxes for performance testing. The test results are shown in Table 5 below.

[0060] In Table 3, the mass percentage of each compound listed in numbers 1 to 14 is relative to the total mass of the compounds listed in numbers 1 to 14; the mass percentage of the compound listed in number 15 is also relative to the total mass of the compounds listed in numbers 1 to 14.

[0061] In Table 4, the mass percentage of each compound listed in numbers 1 to 16 is relative to the total mass of the compounds listed in numbers 1 to 16; the mass percentage of the compound listed in number 17 is also relative to the total mass of the compounds listed in numbers 1 to 16.

[0062] Table 3. Formulation composition of the liquid crystal compositions in Example 1 and Comparative Example 1

[0063] Table 4. Formulation composition of the liquid crystal compositions in Example 2 and Comparative Example 2

[0064] Table 5. Test results of performance parameters of the liquid crystal compositions in Examples 1 and 2 and Comparative Examples 1 and 2

[0065] As can be seen from Table 5, compared with Comparative Example 1 and Comparative Example 2, under the condition that Δn(589) is basically the same, the refractive index of the liquid crystal compositions of Example 1 and Example 2 is significantly larger at long wavelength (680nm) and significantly smaller at short wavelength (546nm, 450nm). The values ​​of Δn(450)-Δn(680) of Example 1 and Example 2 are small, that is, the refractive index of the liquid crystal compositions of Example 1 and Example 2 changes little at different wavelengths and has small dispersion under different wavelengths of light, which can effectively improve the transmittance of the liquid crystal display.

[0066] As can be seen from Table 5, compared with Comparative Example 1 and Comparative Example 2, the liquid crystal compositions of Example 1 and Example 2 have higher VHR after 500 hours of high temperature and high humidity aging, and their high temperature and high humidity resistance is significantly improved.

[0067] Comparative Example 3 and Example 3 The liquid crystal compositions of Comparative Example 3 and Example 3 were prepared according to the compounds listed in Table 6 and their corresponding mass percentages, and were filled into the corresponding test boxes for performance testing. The test results are shown in Table 7 below.

[0068] In Table 6, the mass percentage of each compound listed in numbers 1 to 19 is relative to the total mass of the compounds listed in numbers 1 to 19; the mass percentage of the compound listed in number 20 is also relative to the total mass of the compounds listed in numbers 1 to 19.

[0069] Table 6. Formulation composition of the liquid crystal compositions in Example 3 and Comparative Example 3

[0070] Table 7. Test results of performance parameters of the liquid crystal compositions in Example 3 and Comparative Example 3

[0071] As can be seen from Table 7, compared with Comparative Example 3, under the condition that Δn(589) is basically the same, the refractive index of the liquid crystal composition of Example 3 is significantly larger at long wavelength (680nm), while the refractive index at short wavelength (546nm, 450nm) is significantly smaller. The value of Δn(450)-Δn(680) of Example 3 is small, that is, the refractive index of the liquid crystal composition of Example 3 changes little at different wavelengths and the dispersion is small under different wavelengths of light. As can also be seen from Table 7, compared with Comparative Example 3, the liquid crystal composition of Example 3 has a higher VHR after 500h of high temperature and high humidity aging, and the high temperature and high humidity resistance is significantly improved.

[0072] Examples 4 and 5 The liquid crystal compositions of Examples 4 and 5 were prepared according to the compounds listed in Tables 8 and 9 and their corresponding mass percentages, respectively, and were filled into the corresponding test boxes for performance testing. The test results are shown in Table 10 below.

[0073] In Table 8, the mass percentage of each compound listed in numbers 1 to 14 is relative to the total mass of the compounds listed in numbers 1 to 14; the mass percentage of the compound listed in number 15 is also relative to the total mass of the compounds listed in numbers 1 to 14.

[0074] In Table 9, the mass percentage of each compound listed in numbers 1 to 17 is relative to the total mass of the compounds listed in numbers 1 to 17; the mass percentage of the compound listed in number 18 is also relative to the total mass of the compounds listed in numbers 1 to 17.

[0075] Table 8 Formulation composition of the liquid crystal composition in Example 4

[0076] Table 9 Formulation of the liquid crystal composition in Example 5

[0077] Table 10 Performance parameter test results of the liquid crystal compositions in Application Examples 4 and 5

[0078] Examples 6 to 9 The liquid crystal compositions of Examples 6 to 9 were prepared according to the compounds listed in Tables 11 to 14 and their corresponding mass percentages, and were filled into the corresponding test boxes for performance testing. The test results are shown in Table 15 below.

[0079] In Table 12, the mass percentage of each compound listed in numbers 1 to 18 is relative to the total mass of the compounds listed in numbers 1 to 18; the mass percentage of the compound listed in number 19 is also relative to the total mass of the compounds listed in numbers 1 to 18.

[0080] In Table 13, the mass percentage of each compound described in numbers 1 to 14 is relative to the total mass of the compounds described in numbers 1 to 14; the mass percentage of the compound described in number 15 is also relative to the total mass of the compounds described in numbers 1 to 14.

[0081] In Table 14, the mass percentage of each compound described in numbers 1 to 19 is relative to the total mass of the compounds described in numbers 1 to 19; the mass percentage of compounds described in numbers 20 and 21 is also relative to the total mass of the compounds described in numbers 1 to 19.

[0082] Table 11 Formulation of the liquid crystal composition in Example 6

[0083] Table 12 Formulation of the liquid crystal composition in Example 7

[0084] Table 13 Formulation of the liquid crystal composition in Example 8

[0085] Table 14 Formulation of the liquid crystal composition in Example 9

[0086] Table 15 Test results of performance parameters of the liquid crystal compositions in Application Examples 6-9

[0087] As can be seen from the test data in Table 15, the liquid crystal compositions of Examples 6 to 9 show small changes in refractive index under different wavelengths and small dispersion under different wavelengths of light, which can effectively improve the transmittance of the liquid crystal display. After aging at high temperature and humidity for 500 hours, the VHR is relatively high, and the high temperature and humidity resistance is significantly improved.

[0088] In summary, the liquid crystal composition containing compound I provided in this invention has the advantages of good reliability after long-term high temperature and high humidity aging, small refractive index change at different wavelengths, and low dispersion under different wavelengths of light. The display device containing this liquid crystal composition also has the advantages of good reliability after long-term high temperature and high humidity aging, low dispersion under different wavelengths of light, and high transmittance. It can be used for liquid crystal display devices that are resistant to high temperature and high humidity, have high transmittance and contrast, and is especially suitable for IPS and FFS mode liquid crystal display devices.

[0089] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises one or more compounds represented by Formula I: I； Wherein, R1 represents an alkyl group having 1-12 carbon atoms, an alkoxy group having 1-12 carbon atoms, an alkenyl group having 2-12 carbon atoms, or an alkenyloxy group having 2-12 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by cyclopentylene, cyclopentenylene, cyclobutylene, or cyclopropylene. X1 represents F, alkyl with 1-12 carbon atoms, alkoxy with 1-12 carbon atoms, alkenyl with 2-12 carbon atoms, fluoroalkyl with 1-5 carbon atoms, fluoroalkoxy with 1-5 carbon atoms, fluoroalkenyl with 2-5 carbon atoms, or fluoroalkenyloxy with 2-5 carbon atoms.

2. The liquid crystal composition according to claim 1, characterized in that, The compound represented by Formula I is selected from at least one of the compounds represented by Formulas I-1 to I-4: I-1； I-2； I-3； I-4； Among them, R 11 X represents an alkenyl group with 2-6 carbon atoms. 11 R represents an alkyl group having 1-6 carbon atoms or an alkenyl group having 2-6 carbon atoms. 12 X represents an alkyl group having 1-6 carbon atoms or an alkoxy group having 1-6 carbon atoms. 12 R represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms. 13 It indicates an alkyl group having 1-6 carbon atoms or an alkenyl group having 2-6 carbon atoms.

3. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further comprises the compound shown in Formula II and / or the compound shown in Formula III; The compounds represented by Formula II are as follows: II; in, express or , One or more H atoms can be replaced by F; express , or ; R2 represents an alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms, wherein any one or more unattached -CH2- groups can be replaced by -O-, , or Substitute; Z1 represents -CO-O-, -CH2O-, or a single bond; X2 represents F, CN, CF3, or OCF3; m1 represents 1, 2, or 3; When m1 represents 2 or 3 Same or different, Z1 same or different; The compound represented by Formula III is as follows: III; Among them, R3 and R 3a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms.

4. The liquid crystal composition according to claim 1 or 3, characterized in that, The liquid crystal composition further comprises at least one compound of formula IV, wherein the compound of formula IV is selected from the group consisting of compounds of formulas IV-1 and IV-2: IV-1; IV-2; Among them, R4 and R 4a Each of these can independently represent an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, or an alkenyloxy group having 2-10 carbon atoms, wherein any one or more unconnected -CH2- can be replaced by cyclopentylene, cyclopentenylene, cyclobutylene, or cyclopropylene. , , and Each represents independently , , , , or ; m2 represents 1 or 2. When m2 represents 2, Same or different.

5. The liquid crystal composition according to claim 4, characterized in that, The liquid crystal composition further comprises at least one compound of formula V: V； Among them, R5, R 5a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms.

6. The liquid crystal composition according to claim 5, characterized in that, The liquid crystal composition further comprises at least one compound of formula VI: WE; Wherein, R6 represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms, wherein any one or more unattached -CH2- groups can be replaced by -O- groups, , or Substitute; R 6a and R 6b Each can independently represent H, F, alkyl with 1-6 carbon atoms, alkoxy with 1-6 carbon atoms, or alkenyl with 2-6 carbon atoms; express or .

7. The liquid crystal composition according to claim 5, characterized in that, The liquid crystal composition further comprises at least one compound represented by formula VII: VII; in, express , , , or ; R7, R 7a Each can independently represent an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, or an alkenyl group having 2-6 carbon atoms; Z2 represents -CH2-CH2-, -CO-O-, -CH2O-, -CH=CH-, -C≡C-, or a single bond; m3 represents 1, 2, or 3; When m3 represents 2 or 3 Same or different, Z3 is the same or different.

8. The liquid crystal composition according to claim 7, characterized in that, The liquid crystal composition further comprises at least one compound represented by formula VIII: VIII; in, express , or ,in At most one H atom can be replaced by F; R8, R 8a Each can be independently represented as an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, an alkenyl group having 2-6 carbon atoms, or an alkenyloxy group having 2-6 carbon atoms; Z3 represents -CH2-CH2-, -CO-O-, -CH2O-, -CH=CH-, -C≡C-, or a single bond; m4 represents 1 or 2; When m4 represents 2 Same or different.

9. A liquid crystal display device, characterized in that, The liquid crystal composition comprising any one of claims 1 to 8.

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