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

Abstract

The present invention discloses a positive dielectric anisotropy nematic liquid crystal composition, which comprises one or more compounds represented by formula I and one or more compounds represented by formula II. This composition has the characteristics of high transmittance, high dielectric anisotropy, relatively high optical anisotropy, high vertical dielectric anisotropy, high ε ⊥ / Δε ratio, a relatively wide nematic phase temperature range, strong ultraviolet and high temperature resistance, and no afterimage defects. The present invention also discloses a liquid crystal display element and a liquid crystal display comprising this liquid crystal composition.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal materials, and more specifically to a positive dielectric anisotropy liquid crystal composition, a liquid crystal display element or a liquid crystal display. Background Art

[0002] With the development of display technology, flat display devices such as liquid crystal displays (LCD) 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 of high image quality, power saving, thin body and wide application range, becoming the mainstream of display devices.

[0003] With the continuous improvement of digital information technology, consumers have a higher pursuit of the display performance of LCD devices. In the field of notebook computer display, the screen-to-body ratio is getting larger and larger, and has transitioned from 16:9 to 16:10, and is developing towards a larger display area, and finally becoming a full-screen display. With the increase in display area, the resolution of display devices also needs to be continuously improved to meet the demand for high image quality. 2K resolution and even 4K resolution will gradually become the necessary display requirements for mainstream notebook computer products. However, high resolution leads to a decrease in the aperture ratio of the display panel, and both brightness and contrast will be affected by it, showing a significant decrease.

[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 high transmittance, high dielectric anisotropy, high optical anisotropy, high perpendicular dielectric anisotropy, high ε ⊥ / Δε ratio, a wider nematic phase temperature range, strong UV and high temperature resistance, and a liquid crystal composition with no afterimage defects. When used in high-resolution display components, it will not reduce the aperture ratio, brightness, and contrast of the display panel.

[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 object, the present invention adopts the following technical scheme:

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

[0010]

[0011] Among them,

[0012] R1 represents an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3;

[0013] R2 and R3 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, a fluorine-substituted 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 of the groups represented by R2 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; Z represents -O- or -S-.

[0014] Furthermore, the compound represented by Formula I is selected from the group consisting of the compounds represented by Formula I1 to I6,

[0015]

[0016] Furthermore, the compound represented by Formula II is selected from the group consisting of the compounds represented by Formula II1 to II6,

[0017]

[0018] Among them, R 21 , R 31 each independently represent an alkyl group having 1 to 6 carbon atoms.

[0019] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula III:

[0020]

[0021] Among them, R4 and R5 each independently represent 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;

[0022] each independently represent

[0023] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula IV:

[0024]

[0025] Among them, R6 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 of the -CH2- groups in the group represented by R6 are replaced by an optional cyclopentylene group, cyclobutylene group, or cyclopropylene group;

[0026] each independently represents

[0027] X1 and X2 each independently represent H or F; Y2 represents -F, -CF3, or -OCF3; m represents 1 or 2. When m represents 2, they may be the same or different.

[0028] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula V:

[0029]

[0030] Among them, R7 and R8 each independently represent 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 R7 and R8 are replaced by an optional cyclopentylene group, cyclobutylene group, or cyclopropylene group;

[0031] Z1 represents a single bond or -CH2O-;

[0032] each independently represents

[0033] q represents 1 or 2; n represents 0 or 1;

[0034] When q represents 2, they may be the same or different.

[0035] Furthermore, the compound represented by Formula V is selected from the group consisting of compounds represented by Formula V1 to V8,

[0036]

[0037]

[0038] Among them, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and any one or more non-adjacent -CH2- groups in R7 are replaced by an optional cyclopentylene group, cyclobutylene group, or cyclopropylene group.

[0039] Further, the liquid crystal composition further comprises one or more compounds represented by Formula VI:

[0040]

[0041] Wherein, R9 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, an alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-connected -CH2- groups in the groups represented by R9 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group;

[0042] each independently represents

[0043] p represents 1 or 2; when p represents 2, may be the same or different; X3 and X4 each independently represent H or F.

[0044] Further, the liquid crystal composition further comprises one or more compounds selected from those represented by Formula VII1 to Formula VII5:

[0045]

[0046]

[0047] Wherein, R 10 represents an alkyl group having 1 to 10 carbon atoms, and any one or more non-connected -CH2- groups in the group represented by R 10 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; R 11 represents an alkoxy group having 1 to 10 carbon atoms.

[0048] The present invention also provides a liquid crystal display element, which comprises the liquid crystal composition of the present invention, and the liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element.

[0049] The present invention also provides a liquid crystal display, which comprises the liquid crystal composition of the present invention, and the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

[0050] The beneficial effects of the present invention are as follows:

[0051] The liquid crystal composition provided by the present invention has high transmittance, relatively high optical anisotropy, high dielectric anisotropy, high vertical dielectric constant, high ε⊥ / Δε ratio, a relatively wide nematic phase temperature range, and strong ultraviolet and high-temperature resistance, no afterimage defects, and is particularly suitable for liquid crystal display components with high resolution (such as 2K or higher resolution), and will not cause a decrease in the aperture ratio of the display panel due to high resolution, thereby resulting in a significant decrease in brightness and contrast.

[0052] The liquid crystal display element and liquid crystal display of the present invention, by containing the liquid crystal composition of the present invention described above, have high contrast, a thin and light panel, low energy consumption, a relatively wide operating temperature range, and good reliability. Detailed implementation mode

[0053] To illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0054] [Liquid crystal composition]

[0055] A positive dielectric anisotropy nematic liquid crystal composition, the liquid crystal composition comprising one or more compounds represented by formula I and one or more compounds represented by formula II:

[0056]

[0057] Wherein, R1 represents an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3; R2 and R3 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, a fluorine-substituted 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 -CH2- in the group represented by R2 is optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; Z represents -O- or -S-.

[0058] In some preferred examples, the compound represented by formula I is selected from the group consisting of compounds represented by formulae I1 to I6:

[0059]

[0060] Preferably, the compound represented by formula II is selected from the group consisting of compounds represented by formulae II1 to II6:

[0061]

[0062] Among them, R 21 and R 31 each independently represents an alkyl group having 1 to 6 carbon atoms.

[0063] The liquid crystal composition according to the present invention preferably further comprises one or more compounds represented by Formula III:

[0064]

[0065] Among them, R4 and R5 each independently represent 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;

[0066] each independently represents

[0067] The compound represented by Formula III has the characteristics of low rotational viscosity and good miscibility with other compounds, which is beneficial to improving the response speed of the liquid crystal composition.

[0068] Preferably, the compound represented by the aforementioned Formula III is selected from the group consisting of compounds represented by Formula III1 to III13:

[0069]

[0070]

[0071] The liquid crystal composition according to the present invention preferably further comprises one or more compounds represented by Formula IV:

[0072]

[0073] Among them, R6 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 -CH2- in the group represented by R6 are optionally replaced by a sub-cyclopentyl group, a sub-cyclobutyl group, or a sub-cyclopropyl group;

[0074] each independently represents

[0075] X1 and X2 each independently represent H or F; Y2 represents -F, -CF3 or -OCF3; m represents 1 or 2, and when m represents 2, may be the same or different.

[0076] The compound represented by Formula IV has positive dielectric anisotropy, can reduce the threshold voltage of the liquid crystal composition, and is beneficial to reducing power consumption.

[0077] Preferably, the compound represented by Formula IV is selected from the group consisting of the compounds represented by Formulae IV1 to IV12:

[0078]

[0079]

[0080] Wherein, R6 represents an alkyl group having 1 to 10 carbon atoms, and any one or more of -CH2- in the group represented by R6 is replaced by an optional cyclopentylene group, cyclobutylene group or cyclopropylene group.

[0081] More preferably, the compound represented by Formula IV is selected from the group consisting of the compounds represented by Formulae IV7-1 to IV12-2:

[0082]

[0083]

[0084] The compounds represented by Formulae IV7-1 to IV12-2 not only have a high positive dielectric anisotropy, but also have a high optical anisotropy and a clearing point, which is beneficial to improving the high-temperature resistance of the liquid crystal composition.

[0085] The liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula V:

[0086]

[0087] Wherein, R7 and R8 each independently represent 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- in R7 and R8 are replaced by an optional cyclopentylene group, cyclobutylene group or cyclopropylene group;

[0088] Z1 represents a single bond or -CH2O-;

[0089] Each independently represents

[0090] q represents 1 or 2; n represents 0 or 1;

[0091] When q represents 2, may be the same or different.

[0092] Preferably, the compound represented by Formula V is selected from the group consisting of the compounds represented by Formulae V1 to V8:

[0093]

[0094] Among them, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms, and any one or more non-adjacent -CH2- in R7 are optionally substituted by an optionally selected cyclopentylene group, cyclobutylene group or cyclopropylene group.

[0095] The compound represented by Formula V has a relatively high vertical dielectric constant, which is beneficial to increasing the ε⊥ / Δε ratio of the liquid crystal composition.

[0096] More preferably, the compound represented by the foregoing Formula V is selected from the group consisting of the compounds represented by Formula V2-1 to V6-3:

[0097]

[0098]

[0099]

[0100] The compounds represented by Formula V2-1 to V6-3 not only have a relatively high vertical dielectric constant but also have a relatively high optical anisotropy.

[0101] The liquid crystal composition of the present invention preferably further comprises one or more compounds represented by Formula VI:

[0102]

[0103] Among them, R9 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 non-connected -CH2- in the group represented by R9 are optionally substituted by a cyclopentylene group, cyclobutylene group or cyclopropylene group;

[0104] each independently represents

[0105] p represents 1 or 2; when p represents 2, may be the same or different; X3 and X4 each independently represent H or F;

[0106] Preferably, the compound represented by the foregoing Formula VI is selected from the group consisting of the compounds represented by Formula VI1 to VI5:

[0107]

[0108]

[0109] Among them, R9 represents an alkyl group having 1 to 10 carbon atoms, and any one or more non-consecutive -CH2- groups in the group represented by R9 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group.

[0110] For the compound represented by the aforementioned formula VI, more preferably, the compounds represented by formulae VI3 to VI5 have higher anti-pollution ability, which is beneficial to reducing production costs.

[0111] The liquid crystal composition of the present invention preferably further comprises one or more compounds selected from the compounds represented by formulae VII1 to VII5:

[0112]

[0113]

[0114] Among them, R 10 represents an alkyl group having 1 to 10 carbon atoms, and any one or more non-consecutive -CH2- groups in the group represented by R 10 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; R 11 represents an alkoxy group having 1 to 10 carbon atoms.

[0115] The compounds represented by formulae VII1 to VII5 can increase the vertical dielectric constant without changing the dielectric anisotropy of the liquid crystal composition.

[0116] Examples of the aforementioned 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, decyl, etc.

[0117] Examples of the aforementioned alkoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, etc.

[0118] Examples of the aforementioned 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, 3-hexenyl, etc.

[0119] In the foregoing alkyl group having 1 to 10 carbon atoms substituted with fluorine, alkoxy group having 1 to 10 carbon atoms substituted with fluorine, alkenyl group having 2 to 10 carbon atoms substituted with fluorine, and alkenyloxy group having 3 to 8 carbon atoms substituted with fluorine, "substituted with fluorine" may be monofluoro substitution, or polyfluoro substitution such as difluoro substitution, trifluoro substitution, etc., or may be perfluoro substitution, and there is no particular limitation on the number of fluorine substitutions. For example, as the alkyl group having 1 to 10 carbon atoms substituted with fluorine, fluoromethyl, difluoromethyl, trifluoromethyl, 1-fluoroethyl, 2-fluoroethyl, 1,2-difluoroethyl, 1,1-difluoroethyl, 1,1,2-trifluoroethyl, 1,1,1,2,2-pentafluoro-substituted ethyl, etc. can be listed, but not limited thereto.

[0120] For the group obtained by substituting one or more non-adjacent -CH2- in the foregoing alkyl group having 1 to 10 carbon atoms with cyclopropylidene, cyclobutylidene or cyclopentylidene, for example, cyclopropyl, cyclobutyl, cyclopentyl, methylcyclopropylidene, ethylcyclopropylidene, propylcyclopropylidene, isopropylcyclopropylidene, n-butylcyclopropylidene, isobutylcyclopropylidene, tert-butylcyclopropylidene, methylcyclobutylidene, ethylcyclobutylidene, propylcyclobutylidene, isopropylcyclobutylidene, n-butylcyclobutylidene, isobutylcyclobutylidene, tert-butylcyclobutylidene, methylcyclopentylidene, ethylcyclopentylidene, propylcyclopentylidene, isopropylcyclopentylidene, n-butylcyclopentylidene, isobutylcyclopentylidene, etc. can be listed.

[0121] The liquid crystal composition of the present invention has a dielectric anisotropy Δη of 10.0 to 10.5, an optical anisotropy Δn of 0.124 to 0.129, preferably 0.126 to 0.128, and a clearing point Cp of 80 to 90 °C, preferably 80 to 85 °C.

[0122] In the liquid crystal composition provided by the present invention, the total mass percentage content of other compounds except additives is recorded as 100%.

[0123] Preferably, the liquid crystal composition contains, by mass percentage:

[0124] Preferably, the mass percentage content of the compound represented by Formula I is 7-16%, and more preferably, the mass percentage content of the compound represented by Formula I is 10-15%.

[0125] Preferably, the mass percentage content of the compound represented by Formula II is preferably 5-10%.

[0126] Preferably, the sum of the mass percentage contents of the compounds represented by Formula I and Formula II is less than 25%.

[0127] Preferably, the mass percentage content of the compound represented by Formula III is 40-42%.

[0128] Preferably, the mass percentage content of the compound shown in Formula IV is 5-16%.

[0129] Preferably, the mass percentage content of the compound shown in Formula V is 4-7%.

[0130] Preferably, the mass percentage content of the compound shown in Formula VI is 25-34%, and more preferably, the mass percentage content of the compound shown in Formula VI is 31-34%.

[0131] Preferably, the mass percentage content of the compound shown in Formula VII is 0-4%.

[0132] In the liquid crystal compound of the present invention, dopants with various functions can also be added. The dopant content is preferably between 0.01-1%. These dopants can include, for example, antioxidants, ultraviolet absorbers, and chiral agents.

[0133] Antioxidants can include,

[0134]

[0135] t represents an integer from 1 to 10.

[0136] Light stabilizers can be listed,

[0137]

[0138] Chiral agents (left-handed or right-handed) preferably can include, for example:

[0139]

[0140]

[0141] [Liquid crystal display element or liquid crystal display]

[0142] To achieve the above second object, the present invention provides the following technical solutions:

[0143] A liquid crystal display element, which comprises the liquid crystal composition as described above, and the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0144] To achieve the above third object, the present invention provides the following technical solutions:

[0145] A liquid crystal display, which comprises the liquid crystal composition described in the first object above, and the liquid crystal display is an active matrix display or a passive matrix display.

[0146] The aforementioned active matrix display element or display can specifically include, for example, a TN-TFT or IPS-TFT or FFS-TFT liquid crystal display element or other TFT displays.

[0147] The liquid crystal display element and the liquid crystal display of the present invention have high contrast, a thin and light panel, low power consumption, a wide operating temperature range, and good reliability by including the liquid crystal composition of the present invention described above.

[0148] Examples

[0149] To illustrate the present invention more clearly, the present invention will be further described below in conjunction with examples. Those skilled in the art should understand that the specific content described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0150] In this specification, unless otherwise specified, percentages are all mass percentages, the temperature is in degrees Celsius (°C), and the specific meanings and test conditions of other symbols are as follows:

[0151] Cp represents the liquid crystal clearing point (°C), measured by DSC quantitative method;

[0152] Δn represents the optical anisotropy, n o is the refractive index of the ordinary light, n e is the refractive index of the extraordinary light, and the test conditions are 25 ± 2 °C, 589 nm, measured by an Abbe refractometer;

[0153] Δε represents the 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, and the test conditions are 25 ± 0.5 °C, 20-μm vertical cell, measured by INSTEC: ALCT-IR1;

[0154] γ1 represents the rotational viscosity (mPa·s), and the test conditions are 25 ± 0.5 °C, 20-μm vertical cell, measured by INSTEC: ALCT-IR1;

[0155] K 11 is the splay elastic constant, K 33 is the bend elastic constant, and the test conditions are: 25 °C, INSTEC: ALCT-IR1, 20-μm vertical cell;

[0156] Tr(%) represents the transmittance, Tr(%) = 100% * luminance of the bright state (Vop) / luminance of the light source, measured by the test equipment DMS501, the test conditions are 25 ± 0.5 °C, the test cell is an FFS test cell, the electrode spacing is 5 μm, the electrode width is 3 μm, and the friction direction forms an angle of 7° with the electrode;

[0157] VHR represents the voltage holding ratio (%), and the test conditions are 60 ± 2 °C, voltage of ±5 V, pulse width of 10 ms, and voltage holding time of 166.7 ms. The test equipment is a TOYO Model6254 liquid crystal performance comprehensive tester;

[0158] Afterimage: The afterimage of a liquid crystal display device is the residual level of the inherent pattern during full-screen uniform display, which is visually evaluated in the following 4 grades after displaying a specified fixed pattern in the display area for 1000 hours:

[0159] ◎ No residue

[0160] ○ There is a very small amount of residue, which is an acceptable level

[0161] △ There is residue, which is an unacceptable level

[0162] × There is residue, which is quite poor.

[0163] 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 stirring instrument and heat it to melt. After most of the liquid crystal monomers in the stainless steel beaker have melted, add a magnetic rotor to the stainless steel beaker, stir the mixture evenly, and cool it to room temperature to obtain the liquid crystal composition.

[0164] In the embodiments of the present invention, the structures of liquid crystal monomers are represented by codes. The code representation methods for liquid crystal ring structures, end groups, and linking groups are shown in Table 1 and Table 2 below.

[0165] Table 1 Corresponding codes for ring structures

[0166]

[0167] Table 2 Corresponding codes for end groups and linking groups

[0168]

[0169] For example:

[0170] Its code is CPWP-3-OT;

[0171] Its code is CPWP-3-T;

[0172] Its code is Sb-CpO-O4;

[0173] Its code is Sc-CpO-O4;

[0174] Its code is CC-3-V1;

[0175] Its code is PP-1-2V1;

[0176] Its code is CPY-2-O2;

[0177] Its code is CCY-3-O2;

[0178] Its code is PGUQU-3-F;

[0179] Its code is PGUQY-3-F.

[0180] Example 1

[0181] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0182] Table 3 Formulation of the liquid crystal composition and the corresponding properties in Example 1

[0183]

[0184] Example 2

[0185] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0186] Table 4 Formulation of the liquid crystal composition and the corresponding properties in Example 2

[0187]

[0188]

[0189] Example 3

[0190] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0191] Table 5 Formulation of the liquid crystal composition and the corresponding properties in Example 3

[0192]

[0193]

[0194] Example 4

[0195] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0196] Table 6 Formulation of the liquid crystal composition and the corresponding properties in Example 4

[0197]

[0198] Example 5

[0199] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0200] Table 7 Formulation of the liquid crystal composition and the corresponding properties in Example 5

[0201]

[0202] Example 6

[0203] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0204] Table 8 Formulation of the liquid crystal composition and the corresponding properties in Example 6

[0205]

[0206]

[0207] Example 7

[0208] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0209] Table 9 Formulation of the liquid crystal composition and the corresponding properties in Example 7

[0210]

[0211]

[0212] Example 8

[0213] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0214] Table 10 Formulation of the liquid crystal composition and the corresponding properties in Example 8

[0215]

[0216] Comparative Example 1

[0217] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0218] Table 11 Formulation of the liquid crystal composition and the corresponding properties in Comparative Example 1

[0219]

[0220]

[0221] Compared with Example 6, in the liquid crystal composition of Comparative Example 1, the compound shown in Formula I is not included. Compounds CPWP-3-2 and CPWP-3-O2 with similar structures are used to replace the compound shown in Formula I in equal amounts. Although the structures are similar, the performance is quite different. The dielectric anisotropy of the liquid crystal composition in Comparative Example 1 decreases significantly compared with Example 6, and a larger driving voltage is required to fully drive the liquid crystal molecules, thus consuming more electrical energy. Compared with Example 6, if at the same driving voltage, since the liquid crystal composition of Comparative Example 1 cannot be fully driven, its transmittance will decrease. A decrease in transmittance requires an increase in backlight brightness to obtain a picture brightness that meets the requirements, thus consuming more electrical energy. The increase in rotational viscosity will also slow down the response speed of the liquid crystal composition in Comparative Example 1.

[0222] Comparative Example 2

[0223] The formulation and corresponding properties of the liquid crystal composition are shown in Table 12 below.

[0224] Table 12 Formulation and Corresponding Properties of the Liquid Crystal Composition in Comparative Example 2

[0225]

[0226]

[0227] Compared with Example 6, in the liquid crystal composition of Comparative Example 2, the compound shown in Formula II is not included, and Compound PY-2O-O4 is used to replace the compound shown in Formula II. While the Δε of the composition increases, ε ⊥ instead decreases, and further ε ⊥ / Δε decreases, which will lead to a decrease in the transmittance of the liquid crystal composition in Comparative Example 2.

[0228] Comparative Example 3

[0229] The formulation and corresponding properties of the liquid crystal composition are shown in Table 13 below.

[0230] Table 13 Formulation and Corresponding Properties of the Liquid Crystal Composition in Comparative Example 3

[0231]

[0232]

[0233] Compared with Example 6, the liquid crystal composition of Comparative Example 3 does not contain the compounds represented by Formula I and Formula II. The dielectric anisotropy of the liquid crystal composition of Comparative Example 4 decreases significantly compared with Example 6, and a greater driving voltage is required to fully drive the liquid crystal molecules, thereby consuming more electric energy. Compared with Example 6, if under the same driving voltage, since the liquid crystal composition of Comparative Example 1 cannot be fully driven, its transmittance will decrease. A decrease in transmittance requires an increase in backlight brightness to obtain a picture brightness that meets the requirements, thereby consuming more electric energy.

[0234] Comparative Example 4

[0235] The formulation and corresponding properties of the liquid crystal composition are shown in Table 14 below.

[0236] Table 14 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 4

[0237]

[0238] Compared with Example 1, in the liquid crystal composition of Comparative Example 4, the sum of the mass percentage contents of the compounds represented by Formula I and Formula II is 26%. Although the parameters of each comparative example are the same as or similar to those of the examples, crystallization occurs during low-temperature storage. The specific low-temperature storage conditions are shown in Table 15.

[0239] The following Table 15 shows the low-temperature storage experimental data of the liquid crystal compositions of the examples and comparative examples.

[0240] For the low-temperature storage experiment, 5 ml glass bottles and 4 μm liquid crystal test cells were used for testing respectively. 1 ml of the liquid crystal compositions of the examples and comparative examples was taken and placed in 5 ml glass bottles as the first group of low-temperature storage experiments. The liquid crystal compositions of the examples and comparative examples were filled into the liquid crystal test cells as the second group of low-temperature storage experiments. The glass bottles filled with the liquid crystal composition were placed in a -20°C glove box, and the liquid crystal test cells filled with the liquid crystal composition were placed in -20°C and -30°C glove boxes respectively.

[0241] Table 15 Low-Temperature Storage Experimental Data of Examples and Comparative Examples

[0242] -20 °C glass bottle -20 °C test box -30 °C test box Example 1 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 2 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 3 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 4 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 5 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 6 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 7 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Example 8 No crystallization after 480 hours No crystallization after 720 hours No crystallization after 720 hours Comparative Example 1 No crystallization after 480 hours No crystallization after 720 hours Crystallization occurred after 48 hours Comparative Example 2 Crystallization occurred after 120 hours Crystallization occurred after 240 hours Crystallization occurred after 120 hours Comparative Example 3 Crystallization occurred after 120 hours Crystallization occurred after 240 hours Crystallization occurred after 120 hours Comparative Example 4 Crystallization occurred after 24 hours Crystallization occurred after 48 hours Crystallization occurred after 24 hours

[0243] As can be seen from Table 15 above, the liquid crystal composition of the example of the present invention has a wider nematic phase temperature range.

[0244] The following Table 16 shows the reliability test data of the liquid crystal compositions of the examples and comparative examples.

[0245] The reliability of the liquid crystal composition during the production process of liquid crystal display elements or liquid crystal displays is evaluated through ultraviolet aging tests and VHR tests. The smaller the change in VHR data before and after the ultraviolet test of the liquid crystal composition, the stronger the ultraviolet resistance. Therefore, the ultraviolet resistance is judged by comparing the changes in VHR data before and after the test for each example and comparative example.

[0246] The reliability of the liquid crystal composition during operation can be evaluated through backlight aging tests and VHR tests. Under long-term backlight irradiation, the liquid crystal composition will be in a working environment of visible light, ultraviolet light, and 60 - 70 °C for a long time and be damaged by the external environment. The smaller the change in VHR data before and after the backlight test of the liquid crystal composition, the stronger the resistance to external environmental damage. Therefore, the resistance to external environmental damage is judged by comparing the changes in VHR data before and after the test for each example and comparative example.

[0247] First, before conducting the ultraviolet and backlight aging tests, the VHR data of the liquid crystal composition is measured as the initial VHR data. Then, the liquid crystal composition is subjected to ultraviolet and backlight aging tests, and the VHR data of the liquid crystal composition is measured again after the test.

[0248] Ultraviolet aging test: The liquid crystal composition is poured into the corresponding test cell and irradiated with 5000 mJ of energy under an ultraviolet lamp with a wavelength of 365 nm.

[0249] Backlight test: The liquid crystal composition is poured into the corresponding test cell, sealed, and placed on a backlight with a light intensity of 25000 nit for backlight aging tests. After aging for 1000 H, a VHR test is conducted.

[0250] The smaller the change in VHR data after the aging test relative to the initial VHR data, the stronger the resistance of the liquid crystal composition to external environmental damage. Therefore, the higher the reliability of the liquid crystal composition.

[0251] In addition, the liquid crystal compositions of Examples 1 - 8 and Comparative Examples 1 - 4 are poured into liquid crystal test cells for afterimage tests, and the test results are shown in Table 16 below.

[0252] Table 16 Reliability test data of liquid crystal compositions of Examples 1 - 8 and Comparative Examples 1 - 4

[0253]

[0254]

[0255] As can be seen from Table 16 above, the VHR of the liquid crystal compositions of the examples of the present invention decreases less after ultraviolet and backlight treatments, has high ultraviolet and high-temperature resistance, and significantly improves afterimage defects.

[0256] Table 17 below shows the transmittance test data of the liquid crystal compositions in the examples and comparative examples.

[0257] Table 17 Transmittance Test Data of the Liquid Crystal Compositions in Example 6 and Comparative Examples 1-3

[0258] Δε <![CDATA[ε ⊥ > <![CDATA[ε ⊥ / Δε]]> Tr(％) Δn d (μm) Example 6 10.1 5.4 0.535 42.85 0.126 2.7 Comparative Example 1 9.3 5.3 0.570 33.64 0.131 2.6 Comparative Example 2 10.4 5.0 0.480 36.76 0.126 2.7 Comparative Example 3 9.5 5.0 0.526 31.34 0.130 2.6

[0259] The liquid crystal compositions of the examples and comparative examples were tested with a driving voltage of 3.5V and a design with a delay amount of 340nm. Since the dielectric anisotropy of Comparative Examples 1 and 3 is small, a larger voltage is required to fully drive, consuming more electrical energy. Using the same driving voltage as in Example 6 and Comparative Example 2, Comparative Examples 1 and 3 cannot be fully driven and have a smaller transmittance. Compared with Comparative Example 2, Example 6 has a larger vertical dielectric constant and ε ⊥ / Δε ratio, and a higher transmittance. The increase in transmittance is beneficial to the full utilization of the backlight, thereby reducing the backlight brightness and energy consumption.

[0260] In summary, the liquid crystal composition of the present invention has high transmittance, relatively high optical anisotropy, high dielectric anisotropy, high vertical dielectric constant, high ε⊥ / Δε ratio, a relatively wide nematic phase temperature range, and strong ultraviolet and high-temperature resistance, and has no afterimage defects. The liquid crystal display element and liquid crystal display of the present invention, by containing the liquid crystal composition of the present invention described above, have high contrast, a thin and light panel, low energy consumption, a relatively wide operating temperature range, and good reliability.

[0261] 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 manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A positive dielectric anisotropy nematic liquid crystal composition, characterized in that, The liquid crystal composition contains one or more compounds represented by Formula I, and one or more compounds represented by Formula II: Ⅰ； Ⅱ； Wherein, R1 represents an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3; R2 and R3 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, a fluorine-substituted 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 of the groups represented by R2 are optionally replaced by -CH2- with cyclopentylene, cyclobutylene or cyclopropylene; Z represents -O- or -S-; The liquid crystal composition further contains one or more compounds represented by Formula III: Ⅲ； Wherein, R4 and R5 each independently represent 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; , each independently represent or ; The liquid crystal composition further contains one or more compounds represented by Formula VI: Ⅵ； Wherein, R9 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, an alkenyloxy group having 3 to 8 carbon atoms, and any one or more non-adjacent -CH2- in the group represented by R9 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; , each independently represents , , , , or ; p represents 1 or 2; when p represents 2, they may be the same or different; X3 and X4 each independently represent H or F.

2. The liquid crystal composition according to claim 1, wherein The compound represented by Formula I is selected from the group consisting of compounds represented by Formula I1 to I6, Ⅰ1； Ⅰ2； Ⅰ3； Ⅰ4； Ⅰ5； Ⅰ6； The compound represented by Formula II is selected from the group consisting of compounds represented by Formula II1 to II6, Ⅱ1； Ⅱ2； Ⅱ3； Ⅱ4； Ⅱ5； Ⅱ6； Among them, R 21 , R 31 each independently represents an alkyl group having 1 to 6 carbon atoms.

3. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains one or more compounds represented by Formula IV: Ⅳ； Wherein, R6 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 -CH2- in the group represented by R6 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; , each independently represents , , , or ; X1 and X2 each independently represent H or F; Y2 represents -F, -CF3 or -OCF3; m represents 1 or 2, and when m represents 2, they may be the same or different.

4. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further contains one or more compounds represented by Formula V: Ⅴ； Wherein, R7 and R8 each independently represent 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- in R7 and R8 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene; Z1 represents a single bond or -CH2O-; , each independently represents , or ; q represents 1 or 2; n represents 0 or 1; When q represents 2, they may be the same or different.

5. The liquid crystal composition according to claim 4, characterized in that, The compound represented by Formula V is selected from the group consisting of compounds represented by Formula V1 to V8, Ⅴ1； Ⅴ2； Ⅴ3； Ⅴ4； Ⅴ5； Ⅴ6； Ⅴ7； Ⅴ8； Wherein, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, and any one or more non-adjacent -CH2- in R7 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene.

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises one or more compounds selected from the compounds represented by Formula VII1 to Formula VII5: Ⅶ1； Ⅶ2； Ⅶ3； Ⅶ4； Ⅶ5； Among them, R 10 represents an alkyl group having 1 to 10 carbon atoms, and any one or more non-consecutive -CH2- in the group represented by R 10 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; R 11 represents an alkoxy group having 1 to 10 carbon atoms.

7. A liquid crystal display element, which comprises the liquid crystal composition according to any one of claims 1 to 6, and the display element is an active matrix display element or a passive matrix display element.

8. A liquid crystal display, which comprises the liquid crystal composition according to any one of claims 1 to 6, and the liquid crystal display is an active matrix display or a passive matrix display.

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