A liquid crystal composition, a liquid crystal display element or a liquid crystal display device comprising the same

Abstract

The present invention discloses a liquid crystal composition and a liquid crystal display element or a liquid crystal display comprising the liquid crystal composition. The liquid crystal composition comprises one or more compounds represented by Formula I and one or more compounds represented by Formula II. The liquid crystal composition has high transmittance, high optical anisotropy, relatively high dielectric anisotropy, a high ε ⊥ / Δε ratio, fast response, higher display image quality and lower energy consumption. The present invention also discloses the application of the liquid crystal composition.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal materials. More specifically, it relates to a liquid crystal composition, a liquid crystal display element or a liquid crystal display comprising the same. 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, laptop computers, desktop computers, etc. due to their advantages of high image quality, power saving, thin body and wide application range, and have become the mainstream in display devices.

[0003] With the gradual popularization of 5G communication technology, there is an increasing pursuit of higher display image quality. High refresh rate and high resolution are important development directions in the current MNT display field. Displays with refresh rates of 144Hz, 165Hz and even higher have been continuously developed. Such high refresh rate displays require the liquid crystal materials used to have a faster response speed. Displays with high resolutions of 4K and 8K require liquid crystal materials to have a higher transmittance. However, with the continuous increase of the refresh rate and resolution, the power consumption of the display is also increasing continuously.

[0004] Therefore, developing a liquid crystal composition with high transmittance, fast response and low power consumption is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0005] The first object of the present invention is to provide a liquid crystal composition having high transmittance, high optical anisotropy, relatively high dielectric anisotropy, a high ε⊥ / Δε ratio, and fast response, thereby endowing the liquid crystal composition with higher display image quality and lower power consumption, and it is particularly suitable for the MNT display field.

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

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

[0008] To achieve the above first object, the present invention adopts the following technical solution:

[0009] A liquid crystal composition, the liquid crystal composition comprises one or more compounds represented by formula I, and one or more compounds represented by formula II:

[0010]

[0011] Wherein, R1 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3;

[0012] represent Z1 and Z2 each independently represent a single bond, -CH2CH2-, or -CH2O-;

[0013] p represents 0 or 1, q represents 1 or 2; and when q represents 2, they can be the same or different.

[0014] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula III:

[0015]

[0016] wherein, R3 and R4 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 R3 and R4 represents an alkenyl group having 2 to 10 carbon atoms.

[0017] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula IV:

[0018]

[0019] wherein, R5 and R6 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, and at least one of R5 and R6 represents an alkenyl group having 2 to 10 carbon atoms.

[0020] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula V,

[0021]

[0022] wherein, R7 and R8 each independently represent an alkyl group having 1 - 10 carbon atoms, an alkoxy group having 1 - 10 carbon atoms, or an alkenyl group having 2 - 10 carbon atoms; and at least one of R7 and R8 represents an alkenyl group having 2 to 10 carbon atoms.

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

[0024]

[0025] wherein, R9 represents an alkyl group having 1 - 10 carbon atoms or an alkenyl group having 2 - 10 carbon atoms, and Y2 represents CF3 or OCF3.

[0026] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula VII:

[0027]

[0028] Among them, R 10 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and any one or more non-connected -CH2- in the group represented by R 10 is optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; X1, X2 and X3 each independently represent H or F.

[0029] Furthermore, the liquid crystal composition further contains one or more compounds represented by Formula VIII:

[0030]

[0031] Among them, R 11 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 R 11 is optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group;

[0032] each independently represents m represents 1 or 2; when m represents 2, may be the same or different.

[0033] Furthermore, the compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to I-6:

[0034]

[0035] Furthermore, the compound represented by Formula II contains one or more selected from the group consisting of compounds represented by Formula II-1 to II-8:

[0036] Among them, the definition of R2 is the same as above.

[0037] Furthermore, by mass percentage, in the liquid crystal composition, it contains 15-40 wt% of the compound represented by Formula I and 5-15 wt% of the compound represented by Formula II.

[0038] The second object of the present invention provides a liquid crystal display element, which contains the liquid crystal composition described in the first object above, and the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0039] The third object of the present invention is to provide a liquid crystal display, which comprises the liquid crystal composition as described in the first object above, and the liquid crystal display is an active matrix display or a passive matrix display.

[0040] The beneficial effects of the present invention are as follows:

[0041] In the liquid crystal composition of the present invention, by combining the compounds represented by Formula I and Formula II, the composition has characteristics such as high transmittance, high optical anisotropy, relatively high dielectric anisotropy, high ε ⊥ / Δε ratio, and fast response.

[0042] The liquid crystal display element and the liquid crystal display of the present invention, by comprising the liquid crystal composition of the present invention described above, have the characteristics of being thin and light in panel, high transmittance, fast response speed, and low energy consumption. Detailed Embodiments

[0043] 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.

[0044] [Liquid Crystal Composition]

[0045] One embodiment of the present invention provides a liquid crystal composition, which is a nematic liquid crystal combination. It comprises one or more compounds represented by Formula I, and one or more compounds represented by Formula II:

[0046]

[0047] Wherein, R1 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3;

[0048] represents Z1 and Z2 each independently represent a single bond, -CH2CH2-, or -CH2O-;

[0049] p represents 0 or 1, q represents 1 or 2; and when q represents 2, may be the same or different.

[0050] In the liquid crystal composition of this embodiment, the compounds represented by Formula I and Formula II combine with each other and act synergistically, and have the characteristics of high transmittance, high optical anisotropy, relatively high dielectric anisotropy, high ε⊥ / Δε ratio, and fast response, thereby endowing the liquid crystal composition with higher display image quality and lower energy consumption.

[0051] In a preferred example, each of R1 and R2 independently represents an alkyl group having 1 to 5 carbon atoms. For example, -CH3, -C2H5, -C3H7, -C4H9, -C5H 11 .

[0052] In a preferred example, the compound represented by Formula I is selected from the group consisting of the compounds represented by Formula I-1 to I-6:

[0053]

[0054] In a preferred example, the compound represented by Formula II includes one or more selected from the group consisting of the compounds represented by Formula II-1 to II-8:

[0055]

[0056] Wherein, the definition of R2 is the same as the above definition.

[0057] In yet another preferred example of the present invention, by mass percentage, in the liquid crystal composition, it contains 15 - 40 wt% of the compound represented by Formula I and 5 - 15 wt% of the compound represented by Formula II. Under this condition, in this liquid crystal composition, there is a better synergistic effect between the compounds represented by Formula I and Formula II in improving the transmittance, rapid response, and reducing energy consumption.

[0058] In a preferred example, the liquid crystal composition of the present invention further includes one or more compounds represented by Formula III:

[0059]

[0060] Wherein, each of R3 and R4 independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and at least one of R3 and R4 represents an alkenyl group having 2 to 10 carbon atoms.

[0061] The compound represented by Formula III has the characteristics of low rotational viscosity and good miscibility with other compounds. It is beneficial to improve the response speed of the liquid crystal composition.

[0062] In some preferred examples, each of R3 and R4 independently represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and at least one of R3 and R4 represents an alkenyl group having 2 to 5 carbon atoms.

[0063] In further some preferred examples, the compound represented by Formula III is selected from the group consisting of the compounds represented by Formula III-1 to III-12:

[0064]

[0065] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by Formula IV:

[0066]

[0067] Wherein, R5 and R6 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, and at least one of R5 and R6 represents an alkenyl group having 2 to 10 carbon atoms.

[0068] The compound represented by Formula IV has a large optical anisotropy, a low rotational viscosity, and a large splay elastic constant, which is beneficial to improving the response speed of the liquid crystal composition.

[0069] In some preferred examples, R5 and R6 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms, and at least one of R5 and R6 represents an alkenyl group having 2 to 5 carbon atoms.

[0070] In some preferred examples, the compound represented by Formula IV is selected from the group consisting of compounds represented by Formula IV1 or IV2:

[0071]

[0072] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by Formula V,

[0073]

[0074] 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, or an alkenyl group having 2 to 10 carbon atoms; and at least one of R7 and R8 represents an alkenyl group having 2 to 10 carbon atoms.

[0075] The compound represented by Formula V has a high clearing point and elastic constant, especially the splay elastic constant, which is beneficial to improving the stability of the liquid crystal composition for long-term continuous operation and also beneficial to improving the response speed of the liquid crystal composition.

[0076] In some preferred examples, R7 and R8 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms, and at least one of R7 and R8 represents an alkenyl group having 2 to 5 carbon atoms.

[0077] Preferably, in the liquid crystal composition, the compound represented by Formula V is selected from the group consisting of compounds represented by Formula V1 to V7:

[0078] In still some preferred examples, the liquid crystal composition further comprises one or more compounds represented by Formula VI:

[0079]

[0080] Wherein, R9 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and Y2 represents CF3 or OCF3.

[0081] Preferably, the R9 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.

[0082] In a preferred example, the compound represented by Formula VI is selected from the group consisting of compounds represented by Formula VI1 to VI6:

[0083]

[0084] In some preferred examples, the aforementioned liquid crystal composition of the present invention further comprises one or more compounds represented by Formula VII:

[0085]

[0086] Wherein, R 10 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 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; X1, X2, X3 each independently represent H or F.

[0087] In this embodiment, R 10 can represent a straight-chain alkyl group or a branched-chain alkyl group having 1 to 10 carbon atoms, a straight-chain alkyl group having 1 to 5 carbon atoms or a branched-chain alkyl group having 3 to 5 carbon atoms.

[0088] In some preferred examples, the compound represented by Formula VII is selected from the group consisting of compounds represented by Formula VII1 to VII18:

[0089]

[0090] In some preferred examples, the liquid crystal composition of the present invention further comprises one or more compounds represented by Formula VIII:

[0091]

[0092] Wherein, R 11 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 R 11Any one or more non - adjacent - CH2 - groups in the groups shown are optionally substituted by cyclopentylidene, cyclobutylidene or cyclopropylidene;

[0093] Each independently represents m represents 1 or 2; when m represents 2, may be the same or different.

[0094] Preferably, the compound shown in the foregoing formula VIII is selected from the group consisting of the compounds shown in formula VIII1 to VIII7:

[0095]

[0096]

[0097] wherein, R 11 represents an alkyl group having 1 - 10 carbon atoms, and any one or more non - adjacent - CH2 - groups in the group shown by R 11 are optionally substituted by cyclopentylidene, cyclobutylidene or cyclopropylidene.

[0098] The compound shown in the foregoing formula VIII is further preferably the compound shown in formula VIII2, formula VIII5, formula VIII6, and formula VIII7. The compounds shown in formula VIII2, formula VIII5, formula VIII6, and formula VIII7 have higher anti - pollution ability, which is beneficial to reducing production costs.

[0099] In some preferred examples, the liquid crystal composition of the present invention further comprises one or more compounds shown in formula IX:

[0100]

[0101] wherein: R 12 , R 13 Each independently represents an alkyl group having 1 - 10 carbon atoms, an alkoxy group having 1 - 10 carbon atoms, or an alkenyl group having 2 - 10 carbon atoms; represents

[0102] X4, X5, and X6 each independently represent H or F, and X5 and X6 are not both F at the same time.

[0103] The compound shown in formula IX has a high clearing point. It can significantly increase the clearing point of the liquid crystal composition of the present invention.

[0104] In some preferred examples, the compound shown in the foregoing formula IX is selected from the group consisting of the compounds shown in formula IX1 to formula IX3,

[0105]

[0106] wherein, R 12, R 13 Each independently preferably represents an alkyl group having 2 to 6 carbon atoms or an alkenyl group having 2 to 6 carbon atoms.

[0107] 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, and the like.

[0108] 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, and the like.

[0109] 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, and the like.

[0110] Examples of the group obtained by substituting one or more non-adjacent -CH2- in the aforementioned alkyl group having 1 to 10 carbon atoms with cyclopropylidene, cyclobutylidene, or cyclopentylidene include 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, and the like.

[0111] In the liquid crystal composition provided by the present invention, the total mass percentage of other compounds except additives is 100%.

[0112] The aforementioned liquid crystal composition, by mass percentage, comprises:

[0113] Preferably, the mass percentage of the compound represented by Formula I is 15 - 40%, more preferably, the mass percentage of the compound represented by Formula I is 17 - 30%, and even more preferably, the mass percentage of the compound represented by Formula I is 20 - 28%;

[0114] Preferably, the mass percentage of the compound represented by Formula II is preferably 5 - 15%, more preferably, the mass percentage of the compound represented by Formula II is 9 - 12%;

[0115] Preferably, the mass percentage of the compound shown in Formula III is 40-50%, and more preferably, the mass percentage of the compound shown in Formula III is 42.5-45%;

[0116] Preferably, the mass percentage of the compound shown in Formula IV is 0-10%, and more preferably, the mass percentage of the compound shown in Formula IV is 3-9%; even more preferably, the mass percentage of the compound shown in Formula IV is 4-8%;

[0117] Preferably, the mass percentage of the compound shown in Formula V is 0-17%, and more preferably, the mass percentage of the compound shown in Formula V is 8-12%;

[0118] Preferably, the mass percentage of the compound shown in Formula VI is 0-5%, and more preferably, the mass percentage of the compound shown in Formula VI is 1-3%;

[0119] Preferably, the mass percentage of the compound shown in Formula VII is 0-10%, and more preferably, the mass percentage of the compound shown in Formula VII is 5-7%;

[0120] Preferably, the mass percentage of the compound shown in Formula VIII is 0-8%, and more preferably, the mass percentage of the compound shown in Formula VIII is 2.5-5%;

[0121] Preferably, the mass percentage of the compound shown in Formula IX is 0-5%, and more preferably, the mass percentage of the compound shown in Formula IX is 1-3%.

[0122] In the liquid crystal compound of the present invention, dopants with various functions can also be added. The content of the dopants is preferably between 0.01-1 wt%, and these dopants can include, for example, antioxidants, ultraviolet absorbers, and chiral agents.

[0123] Antioxidants can include,

[0124]

[0125] wherein, t represents an integer from 1 to 10.

[0126] Chiral agents (left-handed or right-handed) preferably can include, for example:

[0127]

[0128] [Liquid crystal display element or liquid crystal display]

[0129] Another embodiment of the present invention provides a liquid crystal display element, which comprises the liquid crystal composition described above, and the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0130] Another embodiment of the present invention provides a liquid crystal display, which comprises the liquid crystal composition as described in the first object above, and the liquid crystal display is an active matrix display or a passive matrix display.

[0131] For the aforementioned active matrix display element or display, specifically, for example, TN-TFT or IPS-TFT or FFS-TFT liquid crystal display elements or other TFT displays can be cited.

[0132] The liquid crystal display element or liquid crystal display of the present invention comprises the liquid crystal composition disclosed in the present invention, and has the characteristics of being thin and light in panel, high in transmittance, fast in response speed, and low in energy consumption.

[0133] Examples

[0134] 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.

[0135] 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:

[0136] Cp represents the clearing point of the liquid crystal (°C), tested by DSC quantitative method;

[0137] 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, tested by an Abbe refractometer;

[0138] 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 antiparallel cell, tested by INSTEC: ALCT-CUST-4C;

[0139] Tr(%) represents the transmittance, Tr(%) = 100% * luminance in the bright state (Vop) / luminance of the light source, the test equipment is DMS501, the test conditions are 25 ± 0.5 °C, the test cell is an IPS 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;

[0140] K 11The flexural elastic constant, with the test conditions being: 25 ± 2 °C, INSTEC: ALCT-CUST-4C, 20-μm parallel cell;

[0141] VHR represents the voltage holding ratio (%), with the test conditions being 60 ± 2 °C, voltage of ±1 V, pulse width of 10 ms, and voltage holding time of 166.7 ms. The test equipment is a TOYO Model 6254 comprehensive liquid crystal performance tester;

[0142] τ represents the response time (ms), and the test instrument is a DMS-501, with the test conditions being 25 ± 0.5 °C, the test cell being an IPS test cell, both the electrode spacing and electrode width being 10 μm, and the friction direction making an angle of 10° with the electrode;

[0143] γ1 represents the rotational viscosity (mPa·s), with the test conditions being 25 ± 0.5 °C, a 20-μm antiparallel cell, and tested with INSTEC: ALCT-CUST-4C.

[0144] 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 then cool it to room temperature to obtain the liquid crystal composition.

[0145] In the embodiments of the present invention, the structures of the liquid crystal monomers are represented by codes. The code representation methods for the liquid crystal ring structure, end groups, and linking groups are shown in Table 1 and Table 2 below.

[0146] Table 1 Corresponding codes for the ring structure

[0147]

[0148]

[0149] Table 2 Corresponding codes for the end groups and linking groups

[0150]

[0151] For example:

[0152] Its code is CPWP-3-OT;

[0153] Its code is CPWP-3-T;

[0154] Its code is CDPU-3-F;

[0155] Its code is CDEPU-3-F;

[0156] Its code is CC-3-V1;

[0157] Its code is PP-1-2V1;

[0158] Its code is CPP-1V-2;

[0159] Its code is PPU-3-F;

[0160] Its code is PGUQP-3-OT;

[0161] Its code is APUQU-Cp-F;

[0162] Its code is DPUQU-3-F;

[0163] Its code is CPPC-3-3.

[0164] Example 1

[0165] The formula of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0166] Table 3 Formulation of the liquid crystal composition of Example 1 and corresponding properties

[0167]

[0168]

[0169] Example 2

[0170] The formula of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0171] Table 4 Formulation of the liquid crystal composition of Example 2 and corresponding properties

[0172]

[0173] Example 3

[0174] The formula of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0175] Table 5 Formulation of the liquid crystal composition of Example 3 and corresponding properties

[0176]

[0177]

[0178] Example 4

[0179] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0180] Table 6 Formulation of the liquid crystal composition and the corresponding properties in Example 4

[0181]

[0182] Example 5

[0183] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0184] Table 7 Formulation of the liquid crystal composition and the corresponding properties in Example 5

[0185]

[0186]

[0187] Example 6

[0188] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0189] Table 8 Formulation of the liquid crystal composition and the corresponding properties in Example 6

[0190]

[0191] Example 7

[0192] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0193] Table 9 Formulation of the liquid crystal composition and the corresponding properties in Example 7

[0194]

[0195] Example 8

[0196] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0197] Table 10 Formulation of the liquid crystal composition and the corresponding properties in Example 8

[0198]

[0199]

[0200] Example 9

[0201] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0202] Table 11 Formulation of the liquid crystal composition of Example 9 and corresponding properties

[0203]

[0204] Example 10

[0205] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0206] Table 12 Formulation of the liquid crystal composition of Example 10 and corresponding properties

[0207]

[0208] Example 11

[0209] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 13 below.

[0210] Table 13 Formulation of the liquid crystal composition of Example 11 and corresponding properties

[0211]

[0212]

[0213] Example 12

[0214] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0215] Table 14 Formulation of the liquid crystal composition of Example 12 and corresponding properties

[0216]

[0217] Example 13

[0218] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 15 below.

[0219] Table 15 Formulation of the liquid crystal composition of Example 13 and corresponding properties

[0220]

[0221]

[0222] Example 14

[0223] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 16 below.

[0224] Table 16 Formulation of the liquid crystal composition of Example 14 and corresponding properties

[0225]

[0226]

[0227] Example 15

[0228] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 17 below.

[0229] Table 17 Formulation and Corresponding Properties of the Liquid Crystal Composition in Example 15

[0230]

[0231] Comparative Example 1

[0232] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 18 below.

[0233] Table 18 Formulation and Corresponding Properties of the Liquid Crystal Composition in Comparative Example 1

[0234]

[0235]

[0236] Compared with Example 10, the liquid crystal composition in Comparative Example 1 does not contain the compound shown in Formula I, and the compounds shown in CPP-3-OT, CPP-4-OT, CPP-5-OT and CPPC-3-3 are added. Although every effort is made to ensure that the liquid crystal compositions of Comparative Example 1 and the examples have substantially the same Δη, ε ⊥ , Cp, γ1, the optical anisotropy Δη and splay elastic constant K of the liquid crystal composition in Comparative Example 1 11 are significantly smaller than those in Example 10. During the design process of a liquid crystal display, in order to ensure excellent visual effects, it is necessary to limit the optical retardation of the liquid crystal display, and under the same process, the retardation is limited to a fixed value. Usually, for a liquid crystal display with a positive dielectric anisotropy IPS display mode, the retardation is 360 nm to 380 nm, and the retardation = Δηd, where d is the thickness of the liquid crystal panel in the liquid crystal display. For example, when the retardation is limited to 360 nm, the liquid crystal composition of Example 10 needs to be filled in a liquid crystal panel with a thickness of 2.7 μm, while the liquid crystal composition of Comparative Example 1 needs to be filled in a liquid crystal panel with a thickness of 3.0 μm. Thus, it can be seen that the liquid crystal display filled with the liquid crystal composition of Example 10 is thinner and lighter. Moreover, since the thinner the liquid crystal panel, the easier it is for liquid crystal molecules to be affected by the electric field, resulting in a faster response speed. Also, the splay elastic constant K of the liquid crystal composition in Comparative Example 1 11 is significantly smaller than that in Example 10, and the splay elastic constant K 11 is related to the response speed of the liquid crystal composition, and the splay elastic constant K 11The larger it is, the faster the response speed. Therefore, when having the same delay amount, the response speed of the liquid crystal display filled with the liquid crystal composition of Example 10 is faster than that of the liquid crystal display filled with the liquid crystal composition of Comparative Example 1.

[0237] Comparative Example 2

[0238] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 19 below.

[0239] Table 19 Formulation of the liquid crystal composition of Comparative Example 2 and the corresponding properties

[0240]

[0241]

[0242] Compared with Example 10, the liquid crystal composition of Comparative Example 2 does not contain the compound shown in Formula I. CPWP-3-2, CPWP-5-2, CPWP-3-O2, CPWP-5-O2 with similar structures are used to equivalently replace the compound shown in Formula I. Although the structures are similar, the properties are quite different. The dielectric anisotropy of the liquid crystal composition of Comparative Example 2 decreases significantly compared with Example 10, and a larger driving voltage is required to fully drive the liquid crystal molecules, thus consuming more electric energy. Compared with Example 10, if at the same driving voltage, since the liquid crystal composition of Comparative Example 2 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 electric energy. The increase in rotational viscosity will also slow down the response speed of the liquid crystal composition of Comparative Example 2.

[0243] Comparative Example 3

[0244] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 20 below.

[0245] Table 20 Formulation of the liquid crystal composition of Comparative Example 3 and the corresponding properties

[0246]

[0247]

[0248] Compared with Example 10, the liquid crystal composition of Comparative Example 3 does not contain the compound shown in Formula II, and compounds CPU-3-F, CEPU-3-F, CCPU-3-F are used to replace DPU-3-F, DEPU-4-F, CDPU-3-F respectively. The liquid crystal composition of Comparative Example 3 has the same Δη as the liquid crystal composition of Example 10, but ε ⊥ decreases, resulting in a decrease in the ratio of ε ⊥ / Δε. Since the transmittance of the liquid crystal composition is related to ε ⊥The ratio of ε / Δε has a positive correlation. On the basis of keeping the dielectric anisotropy Δε the same or similar, the larger the ratio of ε / Δε, the greater the transmittance of the liquid crystal composition. Therefore, the transmittance of the liquid crystal composition in Example 10 is greater than that of the liquid crystal composition in Comparative Example 2, which is more beneficial to improving the transmittance of the liquid crystal display. ⊥ The ratio of ε / Δε is positively correlated. On the basis of keeping the dielectric anisotropy Δε the same or similar, the larger the ratio of ε / Δε, the greater the transmittance of the liquid crystal composition. Therefore, the transmittance of the liquid crystal composition in Example 10 is greater than that of the liquid crystal composition in Comparative Example 2, which is more beneficial to improving the transmittance of the liquid crystal display.

[0249] The response speed of the liquid crystal composition is related to the ratio of γ1 / K 11 The smaller the ratio of γ1 / K 11 the faster the response speed of the liquid crystal composition. Therefore, although Comparative Example 3 and Example 10 have the same Δn and when the delay amount is the same, the liquid crystal composition can be filled into liquid crystal panels of the same thickness, the response speed of the liquid crystal display filled with the liquid crystal composition of Example 10 is faster.

[0250] Comparative Example 4

[0251] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 21 below.

[0252] Table 21 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 4

[0253]

[0254]

[0255] Compared with Example 10, in the liquid crystal composition of Comparative Example 4, the compound shown in Formula IV is not included, and the compound PP-1-5 is used for equal substitution. The liquid crystal composition of Comparative Example 4 and the liquid crystal composition of Example 10 have basically the same Δε, ε ⊥ , Cp, γ1, Δn, but the splay elastic constant K 11 is significantly smaller than that of Example 10. Therefore, when having the same delay amount, the response speed of the liquid crystal display filled with the liquid crystal composition of Example 10 is faster than that of the liquid crystal display filled with the liquid crystal composition of Comparative Example 4.

[0256] Comparative Example 5

[0257] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 22 below.

[0258] Table 22 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 5

[0259]

[0260] Compared with Example 10, in the liquid crystal composition of Comparative Example 5, the compound shown in Formula V is not included, and the compounds CPP-3-2 and CPP-5-3 are used for equal substitution of CPP-1V-2 and CPP-3-2V1 respectively. The liquid crystal composition of Comparative Example 5 and the liquid crystal composition of Example 10 have the same Δε, ε⊥ , Cp, and γ1 are basically the same, but the optical anisotropy Δn and the splay elastic constant K 11 are significantly smaller than those of Example 10. Therefore, the response speed of the liquid crystal display filled with the liquid crystal composition of Example 10 is faster than that of the liquid crystal display filled with the liquid crystal composition of Comparative Example 5.

[0261] Comparative Example 6

[0262] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 23 below.

[0263] Table 23 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 6

[0264]

[0265] Compared with Example 10, the liquid crystal composition of Comparative Example 6 does not contain the compounds shown in Formula I and Formula II. Compounds with similar structures, such as CPWP-3-2, CPWP-5-2, CPWP-3-O2, and CPWP-5-O2, are used to equivalently replace the compound shown in Formula I. Compounds CPU-3-F, CEPU-3-F, and CCPU-3-F are used to replace DPU-3-F, DEPU-4-F, and CDPU-3-F, respectively. And the contents of other compounds are adjusted to ensure that Δε, ε ⊥ , and Δn are basically the same as or similar to those of Example 10. However, γ1 and K of Comparative Example 6 11 are significantly different from those of Example 10.

[0266] The response speed of the liquid crystal composition is related to the ratio of γ1 / K 11 . The smaller the ratio of γ1 / K 11 , the faster the response speed of the liquid crystal composition. Therefore, although Comparative Example 6 and Example 10 have the same Δn and when the delay amount is the same, the liquid crystal composition can be filled into liquid crystal panels of the same thickness, the ratio of γ1 / K of Comparative Example 6 11 is significantly greater than that of Example 10. Therefore, the response speed of the liquid crystal display filled with the liquid crystal composition of Example 10 is faster.

[0267] Comparative Example 7

[0268] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 24 below.

[0269] Table 24 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 7

[0270]

[0271]

[0272] Compared with Example 10, in the liquid crystal composition of Comparative Example 7, the compound represented by Formula I is not included, and the compound represented by Formula II is used for substitution. The optical anisotropy Δn of the liquid crystal composition of Comparative Example 7 is significantly smaller than that of Example 10. Under the same retardation design, Example 10 has a faster response speed. And the ratio of γ1 / K 11 of the liquid crystal composition of Comparative Example 7 is significantly greater than that of Example 10, which also makes the response speed of Comparative Example 7 slower than that of Example 10.

[0273] Comparative Example 8

[0274] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 25 below.

[0275] Table 25 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 8

[0276]

[0277]

[0278] Compared with Example 10, in the liquid crystal composition of Comparative Example 8, the compound represented by Formula II is not included, and the compound represented by Formula I is used for substitution. The dielectric anisotropy of the liquid crystal composition of Comparative Example 8 decreases significantly compared with Example 10, and a larger driving voltage is required to fully drive the liquid crystal molecules, thus consuming more electrical energy. Compared with Example 10, if under the same driving voltage, since the liquid crystal composition of Comparative Example 8 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.

[0279] The following Table 26 shows the test data of Example 10 and the comparative example liquid crystal composition on transmittance and response time, where Tr represents transmittance and represents response time.

[0280] Table 26 Test Data of Transmittance and Response Time of Example 10 and Comparative Example Liquid Crystal Composition

[0281] <![CDATA[ε ⊥ / Δε]]> Tr(％) Δn d (μm) <![CDATA[γ1 / K 11 > τ (ms) Example 10 0.516 41.75 0.134 2.7 3.12 15.28 Comparative Example 1 0.517 36.85 0.123 3.0 3.66 20.34 Comparative Example 2 0.674 - 0.140 2.6 4.05 19.55 Comparative Example 3 0.483 39.05 0.134 2.7 3.58 18.36 Comparative Example 4 0.516 40.62 0.132 2.7 3.29 17.68 Comparative Example 5 0.516 38.92 0.129 2.8 3.23 17.46 Comparative Example 6 0.517 41.23 0.134 2.7 4.16 19.23

[0282] Since the same driving voltage is used for the transmittance test, it is necessary to select liquid crystal compositions with the same or similar Δε for comparative testing. Regarding the test of response time, it is necessary to make a comparison on the basis of the same retardation. The liquid crystal compositions of Example 10 and the comparative example are tested with a driving voltage of 4.5V and a retardation design of 360nm.

[0283] From the test data in Table 26, it can be seen that compared with the liquid crystal composition of the comparative example, the liquid crystal display of the liquid crystal composition of Pouring Example 10 has the characteristics of high transmittance and fast response speed at the same time. Moreover, the increase in transmittance is conducive to the full utilization of the backlight, thereby reducing the backlight brightness and energy consumption.

[0284] Table 27 shows the anti-pollution experimental data of the liquid crystal compositions of Example 9 and Example 10.

[0285] Since the ions in the liquid crystal composition will have a negative impact on the reliability of the liquid crystal composition, during the production and manufacturing process of the liquid crystal composition, liquid crystal display element or liquid crystal display, it is usually selected to be carried out in a dust-free environment. The so-called dust-free environment refers to controlling the microparticles in the air within a certain space range within a certain required range, which is measured by air cleanliness. For example, in a Class 100 dust-free workshop, the allowable particle concentration of 0.5 microns is less than 3520 (pc / m 3 ), and the allowable particle concentration of 5 microns is less than 293 (pc / m 3 ); in a Class 1000 dust-free workshop, the allowable particle concentration of 0.5 microns is less than 35200 (pc / m 3 ), and the allowable particle concentration of 5 microns is less than 2930 (pc / m 3 ). And the higher the cleanliness of the production environment, the higher its production cost, and even increases exponentially. Therefore, being able to improve the anti-pollution ability of the liquid crystal composition can reduce the requirements for air cleanliness during the production and manufacturing process, thereby reducing production costs.

[0286] The liquid crystal compositions provided in Example 9 and Example 10 were respectively poured into test boxes in a Class 100 and Class 1000 dust-free environment to test the VHR data. Then, the test boxes were placed in an oven at a temperature of 85 °C and a humidity of 85% for 500 hours to test the VHR data after the aging experiment. The specific test data are shown in the following table.

[0287] Table 27 Anti-pollution experimental data of the liquid crystal compositions of Example 9 and Example 10

[0288] VHR (Class 100 Initial) VHR (Class 100 Aged) VHR (Class 1000 Initial) VHR (Class 1000 Aged) Example 9 97.56 90.34 95.28 83.65 Example 10 97.75 91.05 96.18 85.38

[0289] From the VHR test data in Table 27, it can be seen that Example 10 containing the compounds shown in Formula VIII 6 and Formula VIII 7 can still maintain a high VHR in an environment with poor environmental cleanliness, which is beneficial to improving the anti-pollution ability of the liquid crystal composition.

[0290] The liquid crystal composition of the present invention combines the compounds shown in Formula I and Formula II, so that the composition has high transmittance, high optical anisotropy, high dielectric anisotropy, high ε ⊥The characteristics such as the / Δε ratio and fast response. The display element or liquid crystal display containing the liquid crystal composition disclosed by the present invention has the characteristics of being thin and light in panel, high transmittance, fast response speed, and low energy consumption.

[0291] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation modes 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 enumerate all implementation modes 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 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 and R2 each independently represent an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3; represent 、 、 or ; Z1 represents a single bond, and Z2 represents a single bond, -CH2CH2-, or -CH2O-; p represents 0 or 1, and q represents 1 or 2; and when q represents 2, they can be the same or different; The liquid crystal composition further contains one or more compounds represented by Formula III: Ⅲ； Wherein, R3 and R4 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 R3 and R4 represents an alkenyl group having 2 to 10 carbon atoms.

2. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further contains one or more compounds represented by Formula IV: Ⅳ； Wherein, R5 and R6 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, and at least one of R5 and R6 represents an alkenyl group having 2 to 10 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 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, or an alkenyl group having 2 to 10 carbon atoms; and at least one of R7 and R8 represents an alkenyl group having 2 to 10 carbon atoms.

4. The liquid crystal composition according to claim 1, wherein 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 or an alkenyl group having 2 to 10 carbon atoms, and Y2 represents CF3 or OCF3.

5. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains one or more compounds represented by Formula VII: Ⅶ； Among them, R 10 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and any one or more non-adjacent -CH2- in the group represented by R 10 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; X1, X2 and X3 each independently represent H or F.

6. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains one or more compounds represented by Formula VIII: Ⅷ； Among them, R 11 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- in the group represented by R 11 is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; , each independently represents , , , , or ; m represents 1 or 2; when m represents 2, they may be the same or different.

7. The liquid crystal composition according to any one of claims 1 to 6, characterized in that, The compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to I-6: Ⅰ-1； Ⅰ-2； Ⅰ-3； Ⅰ-4； Ⅰ-5； Ⅰ-6。 8. The liquid crystal composition according to any one of claims 1 to 6, characterized in that, The compound represented by Formula II contains one or more selected from the group consisting of compounds represented by Formula II-1 to II-8: Ⅱ-1； Ⅱ-2； Ⅱ-3； Ⅱ-4； Ⅱ-5； Ⅱ-6； Ⅱ-7； Ⅱ-8； Wherein, the definition of R2 is the same as that in Claim 1.

9. The liquid crystal composition according to any one of claims 1 to 6, characterized in that, By mass percentage, in the liquid crystal composition, it contains 15-40 wt% of the compound represented by Formula I and 5-15 wt% of the compound represented by Formula II.

10. A liquid crystal display element, characterized in that, It contains the liquid crystal composition according to any one of Claims 1 to 9, and the liquid crystal display element is an active matrix display element or a passive matrix display element.

11. A liquid crystal display, characterized in that, It contains the liquid crystal composition according to any one of Claims 1 to 9, and the liquid crystal display is an active matrix display or a passive matrix display.

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