A positive dielectric anisotropy liquid crystal composition, a liquid crystal display element, or a liquid crystal display

Abstract

The present invention relates to a liquid crystal composition, a liquid crystal display element, and a liquid crystal display comprising the liquid crystal composition, and belongs to the field of liquid crystal displays. The liquid crystal composition of the present invention comprises one or more compounds represented by Formula I and at least one or more compounds represented by Formula II, and comprises one or more compounds represented by Formula I, one or more compounds represented by Formula II, and one or more compounds represented by Formula III. The liquid crystal composition exhibits high transmittance, high dielectric anisotropy, moderate optical anisotropy, high perpendicular dielectric anisotropy, a high ε⊥ / Δε ratio, a wide nematic phase temperature range, good reliability, and is free of afterimage defects. #imgabs0#

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a positive dielectric anisotropic liquid crystal composition and a liquid crystal display element or liquid crystal display containing the liquid crystal composition. Background Art

[0002] With the development of display technology, flat-panel display devices such as liquid crystal displays (LCDs) have been widely used in various consumer electronic products such as mobile phones, televisions, personal digital assistants, digital cameras, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream display device.

[0003] With the continuous advancement of digital information technology, consumers are demanding higher performance from LCD devices. In the laptop display market, screen-to-body ratios are increasing, transitioning from 16:9 to 16:10 and moving towards larger display areas, ultimately leading to full-screen displays. As display area increases, the resolution of display devices must also continue to increase to meet the demand for high image quality. 2K and even 4K resolutions will gradually become a must-have display requirement for mainstream laptops. However, higher resolutions reduce the aperture ratio of display panels, significantly impacting both brightness and contrast.

[0004] Therefore, developing a liquid crystal composition with high transmittance to meet the high-resolution requirements of notebook computer display panels is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] Based on the above facts, the first object of the present invention is to provide a liquid crystal composition that has high transmittance, high dielectric anisotropy, moderate optical anisotropy, high perpendicular dielectric anisotropy, a high ε⊥ / Δε ratio, a wide nematic phase temperature range, good reliability, and no afterimage defects.

[0006] A second object of the present invention is to provide a liquid crystal display element.

[0007] A third object of the present invention is to provide a liquid crystal display.

[0008] In order to achieve the above first purpose, the present invention adopts the following technical solutions:

[0009] A positive dielectric anisotropic liquid crystal composition, comprising one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III.

[0010]

[0011]

[0012] In formula I, R1 represents an alkyl group having 1 to 10 carbon atoms;

[0013] express Z1 and Z2 each independently represent a single bond, -CH2CH2-, or -CH2O-;

[0014] m1 represents 0 or 1, m2 represents 1 or 2; when m2 represents 2, Can be the same or different;

[0015] In formula II, R2 and R3 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of the groups represented by R2 and R3 represents an alkenyl group having 2 to 10 carbon atoms;

[0016] In formula III, R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- in R4 and R5 are replaced by an optional cyclopentylene, cyclobutylene, or cyclopropylene group; W represents -O- or -S-; and the mass percentage content of the compound represented by formula III is 7 to 12%.

[0017] The present invention further provides a liquid crystal display element, which comprises the liquid crystal composition of the present invention. The liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element.

[0018] The present invention further provides a liquid crystal display comprising the liquid crystal composition of the present invention, wherein the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

[0019] Effects of the Invention

[0020] The liquid crystal composition of the present invention has high transmittance, moderate optical anisotropy, high dielectric anisotropy, high perpendicular dielectric constant, high ε⊥ / Δε ratio, wide nematic phase temperature range, good reliability, and is a liquid crystal composition without afterimage defects.

[0021] The liquid crystal display element and liquid crystal display of the present invention, by comprising the aforementioned liquid crystal composition of the present invention, have high brightness, low energy consumption, a wide operating temperature range, and good reliability. DETAILED DESCRIPTION

[0022] [Liquid crystal composition]

[0023] A positive dielectric anisotropic liquid crystal composition, comprising one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III.

[0024]

[0025] In formula I, R1 represents an alkyl group having 1 to 10 carbon atoms;

[0026] express Z1 and Z2 each independently represent a single bond, -CH2CH2-, or -CH2O-;

[0027] m1 represents 0 or 1, m2 represents 1 or 2; when m2 represents 2, Can be the same or different;

[0028] In formula II, R2 and R3 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of the groups represented by R2 and R3 represents an alkenyl group having 2 to 10 carbon atoms;

[0029] In formula III, R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- in R4 and R5 are replaced by an optional cyclopentylene, cyclobutylene, or cyclopropylene group; W represents -O- or -S-; and the mass percentage content of the compound represented by formula III is 7 to 12%.

[0030] Preferably, the compound represented by the aforementioned formula I is selected from the group consisting of compounds represented by formulas I1 to I8:

[0031]

[0032]

[0033] Here, R1 represents an alkyl group having 1 to 10 carbon atoms.

[0034] Preferably, the compound represented by the aforementioned formula II comprises one or more compounds selected from the group consisting of compounds represented by formulas II1 to II7:

[0035]

[0036]

[0037] Preferably, the compound represented by the aforementioned formula III is selected from the group consisting of compounds represented by formulas III1 to III6:

[0038]

[0039] Here, R4 and R5 each independently represent an alkyl group having 1 to 6 carbon atoms.

[0040] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula IV:

[0041]

[0042] Here, R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of R6 and R7 represents an alkenyl group having 2 to 10 carbon atoms.

[0043] The compound represented by Formula IV has the characteristics of low rotational viscosity and good miscibility with other compounds, which is beneficial for improving the response speed and low-temperature solubility of the liquid crystal composition.

[0044] Preferably, the compound represented by the aforementioned formula IV is selected from the group consisting of compounds represented by formulas IV1 to IV12:

[0045]

[0046]

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

[0048]

[0049] wherein R8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R8 are optionally substituted by a cyclopentylene, a cyclobutylene, or a cyclopropylene group;

[0050] Each independently expresses

[0051] p represents 1 or 2; when p represents 2, Can be the same or different.

[0052] Preferably, the compound represented by the aforementioned formula V is selected from the group consisting of compounds represented by formulas V1 to V5:

[0053]

[0054] Wherein, R8 represents an alkyl group having 1 to 10 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R8 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

[0055] The compound represented by the aforementioned formula V, and further preferably, the compounds represented by formulas V3 to V5 have higher vertical dielectric constants and anti-pollution capabilities, which are beneficial to improving transmittance and reducing production costs.

[0056] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VI:

[0057]

[0058] Among them, R9, R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- groups in R9 are substituted by any cyclopentylene, cyclobutylene, or cyclopropylene group;

[0059] Z3 represents a single bond or -CH2O-;

[0060] Each independently expresses

[0061] q represents 1 or 2; n represents 0 or 1;

[0062] When q represents 2, Can be the same or different.

[0063] Preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by formulas VI1 to VI4:

[0064]

[0065] Among them, R9, R 10 Each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms, and R 11 Any one or more non-adjacent -CH2- groups are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

[0066] The compound represented by formula VI has a relatively high vertical dielectric constant, which is beneficial for improving the ε⊥ / Δε ratio of the liquid crystal composition.

[0067] More preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by formulas VI1-1 to VI4-7:

[0068]

[0069]

[0070]

[0071] The compounds represented by formulae VI1-1 to VI4-7 have a relatively high perpendicular dielectric constant and a relatively low optical anisotropy.

[0072] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VII1 and / or compounds represented by formula VII2:

[0073]

[0074] Among them, R 11 represents an alkyl group having 1 to 10 carbon atoms, and R 11 Any one or more unconnected -CH2- groups in the group shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; R 12 It represents an alkoxy group having 1 to 10 carbon atoms.

[0075] The compounds represented by formula VII1 and formula VII2 can increase the vertical dielectric constant without changing the dielectric anisotropy of the liquid crystal composition.

[0076] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula VIII1 and / or compounds represented by formula VIII2:

[0077]

[0078] Among them, R 13 represents an alkyl group having 1 to 10 carbon atoms, R 14 represents an alkoxy group having 1 to 10 carbon atoms, and R 13 Any one or more non-adjacent -CH2- groups are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; the sum of the mass percentages of the compounds represented by formula VIII1 and formula VIII2 is 0.1-1%.

[0079] The combination of the compound represented by formula VIII1 and / or formula VIII2 with the compound represented by formula I, formula II and formula III is beneficial to improving the stability of the liquid crystal composition.

[0080] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by formula IX:

[0081]

[0082] Among them, R 15 represents an alkyl group having 1 to 10 carbon atoms, and R 15 Any one or more -CH2- groups in the groups shown are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene.

[0083] The compound represented by formula IX is beneficial for improving the ultraviolet and high temperature resistance of the liquid crystal composition.

[0084] Examples of the alkyl group having 1 to 10 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, and decyl.

[0085] Examples of the alkoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, nonyloxy, and decyloxy.

[0086] Examples of the alkenyl group having 2 to 10 carbon atoms include vinyl, 1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, and 3-hexenyl.

[0087] The "fluorine-substituted" in the aforementioned fluorine-substituted alkyl group having 1 to 10 carbon atoms, fluorine-substituted alkoxy group having 1 to 10 carbon atoms, fluorine-substituted alkenyl group having 2 to 10 carbon atoms, and fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms may be monofluorinated, or polyfluorinated such as difluorinated, trifluorinated, or perfluorinated, and the number of fluorine substitutions is not particularly limited. For example, examples of the fluorine-substituted alkyl group having 1 to 10 carbon atoms include, but are not limited to, fluoromethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 1,2-difluoroethyl, 1,1-difluoroethyl, 1,1,2-trifluoroethyl, and 1,1,1,2,2-pentafluoroethyl.

[0088] The groups obtained by replacing one or more non-adjacent -CH2- groups in the aforementioned alkyl group having 1 to 10 carbon atoms with cyclopropylene, cyclobutylene or cyclopentylene include, for example, cyclopropyl, cyclobutylene, cyclopentylene, methylcyclopropylene, ethylcyclopropylene, propylcyclopropylene, isopropylcyclopropylene, n-butylcyclopropylene, isobutylcyclopropylene, tert-butylcyclopropylene, methylcyclobutylene, ethylcyclobutylene, propylcyclobutylene, isopropylcyclobutylene, n-butylcyclobutylene, isobutylcyclobutylene, tert-butylcyclobutylene, methylcyclopentylene, ethylcyclopentylene, propylcyclopentylene, isopropylcyclopentylene, n-butylcyclopentylene, and isobutylcyclopentylene.

[0089] The liquid crystal composition of the present invention has a dielectric anisotropy Δε of 9.5 to 10.5, an optical anisotropy Δn of 0.117 to 0.121, and a clearing point Cp of 80 to 82.1°C.

[0090] In the liquid crystal composition provided by the present invention, the total mass percentage content of other compounds except additives is recorded as 100%.

[0091] Preferably, the liquid crystal composition comprises, by mass percentage:

[0092] Preferably, the mass percentage content of the compound represented by formula I is 21.5-25%;

[0093] Preferably, the mass percentage content of the compound represented by formula II is preferably 10-13%;

[0094] Preferably, the mass percentage content of the compound represented by formula III is 7-12%;

[0095] Preferably, the mass percentage content of the compound represented by formula IV is 30-35%;

[0096] Preferably, the mass percentage content of the compound represented by formula V is 18-20.5%;

[0097] Preferably, the mass percentage content of the compound represented by formula VI is 0-10%;

[0098] Preferably, the mass percentage content of the compound represented by formula VII is 0-6%;

[0099] Preferably, the mass percentage content of the compound represented by formula VIII is 0.1-1%, and further preferably, the mass percentage content of the compound represented by formula VIII is 0.5%;

[0100] Preferably, the mass percentage content of the compound represented by formula IX is 0.1-1%, and more preferably, the mass percentage content of the compound represented by formula VIII is 0.5%.

[0101] Various functional dopants may be added to the liquid crystal compound of the present invention. The dopant content is preferably between 0.01% and 1%. Examples of such dopants include antioxidants, ultraviolet absorbers, and chiral agents.

[0102] Antioxidants include,

[0103]

[0104] t represents an integer from 1 to 10.

[0105] Light stabilizers include,

[0106]

[0107] Preferred examples of chiral agents (levorotatory or dextrorotatory) include:

[0108]

[0109] [Liquid crystal display element or liquid crystal display]

[0110] In order to achieve the above second object, the present invention provides the following technical solutions:

[0111] A liquid crystal display element comprises the liquid crystal composition described above, wherein the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0112] In order to achieve the third object above, the present invention provides the following technical solutions:

[0113] A liquid crystal display comprising the liquid crystal composition as described in the first object above, wherein the liquid crystal display is an active matrix display or a passive matrix display.

[0114] The aforementioned active matrix display element or display may specifically include, for example, TN-TFT, IPS-TFT, or FFS-TFT liquid crystal display elements or other TFT displays.

[0115] The liquid crystal display element and liquid crystal display of the present invention, by comprising the aforementioned liquid crystal composition of the present invention, have high brightness, low energy consumption, a wide operating temperature range, and good reliability.

[0116] Example

[0117] In order to illustrate the present invention more clearly, the present invention is further described below in conjunction with embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0118] In this manual, unless otherwise specified, percentages refer to mass percentages, temperatures are in degrees Celsius (°C), and the specific meanings of other symbols and test conditions are as follows:

[0119] Cp represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

[0120] Δn represents the optical anisotropy, n o is the refractive index of ordinary light, n e The refractive index of extraordinary light was measured at 25±2°C, 589 nm, and an Abbe refractometer.

[0121] Δε represents dielectric anisotropy, Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, tested at 25±0.5°C, 20 μm antiparallel cell, INSTEC:ALCT-IR1;

[0122] γ1 represents the rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 μm antiparallel cell, INSTEC: ALCT-IR1 test;

[0123] K 11 is the splay elastic constant, K 33 is the bending elastic constant, the test conditions are: 25°C, INSTEC:ALCT-IR1, 20 μm antiparallel cell;

[0124] Tr (%) represents transmittance, where Tr (%) = 100% * bright state (Vop) brightness / light source brightness. Test equipment: DMS501, test conditions: 25±0.5°C, FFS test box, electrode spacing: 5 μm, electrode width: 3 μm, angle between rubbing direction and electrode: 7°.

[0125] VHR stands for voltage holding ratio (%). Test conditions are 60±2°C, ±5V voltage, 10ms pulse width, and 166.7ms voltage holding time. Test equipment is a TOYO Model 6254 LCD performance tester.

[0126] Afterimage: Afterimages in liquid crystal displays are evaluated by visually inspecting the remaining level of a fixed pattern displayed uniformly across the entire screen after displaying a specified fixed pattern for 1000 hours. The following four levels are used:

[0127] ◎No residue

[0128] ○ There is a very small amount of residue, which is an acceptable level

[0129] △ There is residue, which is an unacceptable level

[0130] × There is residue, which is quite poor.

[0131] The preparation method of the liquid crystal composition is as follows: the liquid crystal monomers are weighed according to a certain ratio and placed in a stainless steel beaker. The stainless steel beaker containing the liquid crystal monomers is placed on a magnetic stirring apparatus to heat and melt. After the liquid crystal monomers in the stainless steel beaker are mostly melted, a magnetic rotor is added to the stainless steel beaker, and the mixture is stirred evenly. After cooling to room temperature, the liquid crystal composition is obtained.

[0132] The liquid crystal monomer structure of the embodiment of the present invention is represented by a code, and the code representation method of the liquid crystal ring structure, end group, and connecting group is shown in Table 1 and Table 2 below.

[0133] Table 1 Corresponding codes of ring structure

[0134]

[0135]

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

[0137]

[0138]

[0139] For example:

[0140] Its code is CDPU-3-F;

[0141] Its code is CDEPU-3-F;

[0142] Its code is CPP-1V-2;

[0143] Its code is Sb-CpO-O4;

[0144] Its code is Sc-CpO-O4;

[0145] Its code is CC-3-V1;

[0146] Its code is PP-1-2V1;

[0147] Its code is CPY-2-O2;

[0148] Its code is CCY-3-O2;

[0149] Its code is PGUQU-3-F;

[0150] Its code is PGUQY-3-F;

[0151] Its code is CLY-3-O2.

[0152] Example 1

[0153] The formula of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0154] Table 3 Formulation of the liquid crystal composition of Example 1 and corresponding properties

[0155]

[0156] Example 2

[0157] The formula of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0158] Table 4 Formulation and corresponding properties of the liquid crystal composition of Example 2

[0159]

[0160]

[0161] Example 3

[0162] The formula of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0163] Table 5 Formulation and corresponding properties of the liquid crystal composition of Example 3

[0164]

[0165]

[0166] Example 4

[0167] The formula of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0168] Table 6 Formulation and corresponding properties of the liquid crystal composition of Example 4

[0169]

[0170] Example 5

[0171] The formula of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0172] Table 7 Formulation and corresponding properties of the liquid crystal composition of Example 5

[0173]

[0174]

[0175] Example 6

[0176] The formula of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0177] Table 8 Formulation and corresponding properties of the liquid crystal composition of Example 6

[0178]

[0179]

[0180] Example 7

[0181] The formula of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0182] Table 9 Formulation of the liquid crystal composition of Example 7 and corresponding properties

[0183]

[0184]

[0185] Example 8

[0186] The formula of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0187] Table 10 Formulation and corresponding properties of the liquid crystal composition of Example 8

[0188]

[0189] Comparative Example 1

[0190] The formula of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0191] Table 11 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 1

[0192]

[0193]

[0194] Comparative Example 2

[0195] The formula of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0196] Table 12 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 2

[0197]

[0198] Compared to Example 1, the liquid crystal composition of Comparative Example 1 does not contain the compound represented by Formula I. Instead, equal amounts of the compounds CPU-3-F, CPU-4-F, and CCPU-3-F are used to replace DPU-3-F, DPU-4-F, and CDPU-3-F, respectively. The liquid crystal composition of Comparative Example 1 exhibits a significant decrease in Δε compared to the liquid crystal composition of Example 1, requiring a higher voltage for complete driving and consuming more power.

[0199] As is known to all, only when two liquid crystal compositions have the same or similar dielectric anisotropy Δε and the same driving voltage, can the comparative transmittance be meaningful. Compounds CPU-3-F, CPU-4-F, and CCPU-3-F were used to replace the compound represented by Formula I in Example 1, and the compound content was adjusted to form Comparative Example 2, so that the Δε of the liquid crystal composition in Comparative Example 2 was the same as that in Example 1. However, ε ⊥ decreases, resulting in ε ⊥ / Δε ratio is reduced. Because the transmittance of the liquid crystal composition is related to ε ⊥ / Δε ratio is positively correlated. On the basis of keeping the dielectric anisotropy Δε the same or similar, ε ⊥ The larger the ratio of Δε / Δε, the greater the transmittance of the liquid crystal composition. Therefore, the transmittance of the liquid crystal composition of Example 1 is greater than that of the liquid crystal composition of Comparative Example 2, which is more conducive to improving the brightness of the liquid crystal display.

[0200] Comparative Example 3

[0201] The formula of the liquid crystal composition and the corresponding properties are shown in Table 13 below.

[0202] Table 13 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 3

[0203]

[0204] Compared with Example 1, the liquid crystal composition of Comparative Example 3 does not contain the compound represented by Formula II, and the compounds CPP-3-2 and CPP-5-2 are used to replace CPP-1V-2 and CPP-3-2V1 in equal amounts, respectively. ⊥ , Cp, γ1 are basically the same, but the optical anisotropy Δn, splay elastic constant K 11 Therefore, the response speed of the liquid crystal display infused with the liquid crystal composition of Example 1 is faster than that of the liquid crystal display infused with the liquid crystal composition of Comparative Example 3.

[0205] Comparative Example 4

[0206] The formula of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0207] Table 14 Formulation and corresponding properties of the liquid crystal composition of Comparative Example 4

[0208]

[0209] Compared with Example 1, the liquid crystal composition of Comparative Example 4 does not contain the compound represented by Formula III, and compounds PY-3-O2 and CPY-3-O2 are used to replace Sb-2O-O5, Sc-2O-O4, and Sc-2O-O5. The liquid crystal composition of Comparative Example 3 is substantially the same as that of the liquid crystal composition of Example 1 in terms of Δε, Cp, γ1, and Δn, except that ε ⊥ Therefore, the transmittance of the liquid crystal composition of Example 1 is greater than that of the liquid crystal composition of Comparative Example 4, which is more conducive to improving the brightness of the liquid crystal display.

[0210] Table 15 below shows the transmittance test data of the liquid crystal compositions of Example 6 and Comparative Examples 1 to 4.

[0211] Table 15 Transmittance test data of liquid crystal compositions of Example 6 and Comparative Examples 1 to 4

[0212]

[0213]

[0214] The liquid crystal compositions of the embodiment and comparative examples were driven by a voltage of 3.5V and tested using a test cell with a cell thickness of 3.0μm. Since the dielectric anisotropy of comparative example 1 is small, a higher voltage is required to fully drive it, consuming more power, and the 3.5V voltage cannot fully drive it, so the transmittance is very low. Compared with comparative examples 2 and 4, the vertical dielectric constant and ε of embodiment 1 are ⊥ / Δε ratio is larger, and the transmittance is higher. ⊥ The ratio of Δε is similar, so the transmittance is similar. Improving the transmittance is conducive to fully utilizing the backlight and increasing the brightness of the LCD panel, and it is also conducive to reducing the backlight brightness and reducing energy consumption.

[0215] Table 16 below shows the reliability test data of the liquid crystal compositions of Examples and Comparative Examples.

[0216] The reliability of liquid crystal compositions in the production of liquid crystal display elements or liquid crystal displays is assessed through UV aging tests and VHR tests. The smaller the change in VHR data before and after the UV test, the stronger the UV resistance of the liquid crystal composition. Therefore, the UV resistance of the examples and comparative examples was determined by comparing the changes in VHR data before and after the test.

[0217] The reliability of liquid crystal compositions during operation can be assessed through backlight aging tests and VHR testing. Under prolonged backlight irradiation, liquid crystal compositions are exposed to visible light, UV light, and temperatures of 60-70°C for extended periods, subjecting them to environmental damage. The smaller the change in VHR data before and after the backlight test, the greater the liquid crystal composition's resistance to environmental damage. Therefore, the resistance to environmental damage can be assessed by comparing the changes in VHR data before and after the test for each example and comparative example.

[0218] First, before conducting the UV and backlight aging tests, the VHR data of the liquid crystal composition is measured as initial VHR data. Then, the liquid crystal composition is subjected to the UV and backlight aging tests, and the VHR data of the liquid crystal composition is measured again after the tests.

[0219] Ultraviolet aging test: The liquid crystal composition was poured into a corresponding test box and irradiated with 5000 mJ of energy under an ultraviolet lamp with a wavelength of 365 nm.

[0220] Backlight test: Pour the liquid crystal composition into the corresponding test box, seal it, and place it on a backlight with a light intensity of 25,000 nits for a backlight aging test. After aging for 1,000 hours, perform a VHR test.

[0221] The smaller the change in the VHR data after the aging test relative to the initial VHR data, the stronger the liquid crystal composition's ability to resist damage from the external environment, and therefore, the higher the reliability of the liquid crystal composition.

[0222] In addition, the liquid crystal compositions of Examples 1 to 8 and Comparative Examples 1 to 4 were poured into a liquid crystal test box and subjected to a residual image test. The test results are shown in Table 16 below.

[0223] Table 16: Reliability test data of liquid crystal compositions of Examples 1 to 8 and Comparative Examples 1 to 4

[0224] VHR (initial) VHR (ultraviolet) VHR (backlight 1000H) afterimage Example 1 98.55 94.79 82.57 ◎ Example 2 98.50 94.68 82.68 ◎ Example 3 98.62 94.72 82.65 ◎ Example 4 98.48 95.89 85.28 ◎ Example 5 98.65 95.79 85.42 ◎ Example 6 98.58 95.82 85.39 ◎ Example 7 98.54 95.91 85.51 ◎ Example 8 98.63 95.85 85.45 ◎ Comparative Example 1 98.82 93.22 80.98 ◎ Comparative Example 2 98.54 93.56 81.04 ○ Comparative Example 3 98.60 93.65 81.15 ○ Comparative Example 4 98.58 93.35 81.25 △

[0225] It can be seen from Table 16 above that the VHR of the liquid crystal composition of the embodiment of the present invention decreases less after exposure to ultraviolet light and backlight, has high resistance to ultraviolet light and high temperature, and has no obvious afterimage problem.

[0226] Table 17 below shows the experimental data of low temperature storage of the liquid crystal compositions of Examples and Comparative Examples.

[0227] Low-temperature storage experiments were conducted using 5ml glass bottles and 4μm liquid crystal test cells. 1ml of each of the Example and Comparative Example liquid crystal compositions was placed in a 5ml glass bottle for the first low-temperature storage experiment. The Example and Comparative Example liquid crystal compositions were then poured into a liquid crystal test cell for the second low-temperature storage experiment. The glass bottles filled with the liquid crystal compositions were placed in a -20°C glove box, while the liquid crystal test cells filled with the compositions were placed in glove boxes at -20°C and -30°C, respectively.

[0228] Table 17 Experimental data of low temperature storage of examples and comparative examples

[0229]

[0230]

[0231] It can be seen from Table 17 above that the liquid crystal composition of the embodiment of the present invention has a wider nematic phase temperature range.

[0232] In summary, the liquid crystal composition of the present invention exhibits high transmittance, moderate optical anisotropy, high dielectric anisotropy, a high perpendicular dielectric constant, a high ε⊥ / Δε ratio, a wide nematic phase temperature range, good reliability, and no residual image defects. The liquid crystal display element and liquid crystal display of the present invention, by incorporating the aforementioned liquid crystal composition of the present invention, exhibit high brightness, low energy consumption, a wide operating temperature range, and good reliability.

[0233] The above embodiments disclosed in the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art may make other changes or modifications based on the above description. It is impossible to enumerate all implementation methods here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A positive dielectric anisotropic liquid crystal composition, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III. In formula I, R1 represents an alkyl group having 1 to 10 carbon atoms; express Z1 and Z2 each independently represent a single bond; m1 represents 0 or 1, m2 represents 1; In formula II, R2 and R3 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of the groups represented by R2 and R3 represents an alkenyl group having 2 to 10 carbon atoms; In formula III, R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, a fluorine-substituted alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- in R4 and R5 are replaced by an optional cyclopentylene, cyclobutylene, or cyclopropylene group; W represents -O- or -S-; and the mass percentage content of the compound represented by formula III is 7 to 12%.

2. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula IV: Here, R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of R6 and R7 represents an alkenyl group having 2 to 10 carbon atoms.

3. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula V, wherein R8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms, and any one or more unconnected -CH2- groups in the group represented by R8 are optionally substituted by a cyclopentylene, a cyclobutylene, or a cyclopropylene group; Each independently expresses p represents 1 or 2; when p represents 2, Can be the same or different.

4. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula VI: Among them, R9, R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a fluorine-substituted alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 3 to 8 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- groups in R9 are substituted by any cyclopentylene, cyclobutylene, or cyclopropylene group; Z3 represents a single bond or -CH2O-; Each independently expresses q represents 1 or 2; n represents 0 or 1; When q represents 2, Can be the same or different.

5. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula VII1 and / or compounds represented by formula VII2: Among them, R 11 represents an alkyl group having 1 to 10 carbon atoms, and R 11 Any one or more unconnected -CH2- groups in the group shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; R 12 It represents an alkoxy group having 1 to 10 carbon atoms.

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula VIII1 and / or compounds represented by formula VIII2: Among them, R 13 represents an alkyl group having 1 to 10 carbon atoms, R 14 represents an alkoxy group having 1 to 10 carbon atoms, and R 13 Any one or more non-adjacent -CH2- groups are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; the sum of the mass percentages of the compounds represented by formula VIII1 and formula VIII2 is 0.1-1%.

7. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds represented by formula IX: Among them, R 15 represents an alkyl group having 1 to 10 carbon atoms, and R 15 Any one or more -CH2- groups in the groups shown are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene. 8 . A liquid crystal display element comprising the liquid crystal composition according to claim 1 , wherein the display element is an active matrix display element or a passive matrix display element. 9 . A liquid crystal display comprising the liquid crystal composition according to claim 1 , wherein the liquid crystal display is an active matrix display or a passive matrix display.

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