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

Abstract

The present invention discloses a liquid crystal composition, which comprises one or more compounds represented by formula I and one or more compounds represented by formula II. Among them, by mass percentage, the liquid crystal composition contains 10-19% of the compound represented by formula I and 26-34% of the compound represented by formula II. The liquid crystal composition has the characteristics of a dielectric anisotropy Δε of 10-12, an optical anisotropy Δn of 0.120-0.130, and a clearing point Cp of 80-90 °C, and is particularly suitable for the display fields of mobile phones and tablet computers. 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 displays. More specifically, it relates to a liquid crystal composition, a liquid crystal display element, and a liquid crystal display including the same. Background Art

[0002] With the development of display technologies, flat panel display devices such as liquid crystal displays (LCDs) have been widely used in various consumer electronic products such as mobile phones, televisions, digital cameras, tablet computers, laptop computers, and desktop computers 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 current 5G communication technologies, there has been an ensuing pursuit of higher display image quality. High refresh rate is an important development direction in the current display fields of mobile phones and tablet computers. Mobile phone and tablet computer display panels with refresh rates of 90Hz, 120Hz, or even higher will be continuously developed. Such high refresh rate display panels require the liquid crystal materials used to have a faster response speed. However, with the increase in the refresh rate, the power consumption of the display panel is also continuously rising. Mobile electronic devices such as mobile phones and tablet computers rely on battery power supply, and the increase in power consumption will directly affect their usage time.

[0004] Therefore, developing a liquid crystal composition with a fast response speed and low power consumption is an urgent problem to be solved in the current display fields of mobile phones and tablet computers. Summary of the Invention

[0005] Based on the above facts, one object of the present invention is to provide a liquid crystal composition having a fast response speed, high optical anisotropy, high dielectric anisotropy, and low power consumption, which is particularly suitable for use in mobile phone and tablet computer display components.

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

[0009] A 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,

[0010]

[0011] Wherein:

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

[0013] R2 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 one or more non-adjacent -CH2- groups in the group represented by R2 are optionally replaced by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group;

[0014] Y2 represents F, CF3, or OCF3;

[0015] each independently represents

[0016] represents

[0017] p represents 1 or 2;

[0018] Among them, by mass percentage, in the liquid crystal composition, it contains 10 to 19% of the compound represented by formula I and 26 to 34% of the compound represented by formula II.

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

[0020]

[0021] Among them, 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.

[0022] Furthermore, the liquid crystal composition further contains one or more compounds represented by formula IV:

[0023]

[0024] Among them, 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.

[0025] Furthermore, the liquid crystal composition further contains one or more compounds represented by formula V,

[0026]

[0027] 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, 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.

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

[0029]

[0030] Among them, R9 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-consecutive -CH2- groups in the group represented by R9 are optionally substituted by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group;

[0031] represents

[0032] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula VII:

[0033]

[0034] 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.

[0035] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula VIII:

[0036]

[0037] Among them, R 11 represents an alkyl group having 1 to 10 carbon atoms; Y3 represents CF3 or OCF3;

[0038] represents

[0039] represents

[0040] Furthermore, the liquid crystal composition further comprises one or more compounds represented by Formula IX and one or more compounds represented by Formula X:

[0041]

[0042] Among them, R 12represents 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, and R 12 any one or more non - adjacent - CH2 - groups in the group shown are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; Y4 represents H or CH3; X1 and X2 each independently represent H or F, and X1 and X2 do not simultaneously represent F; q represents 1 or 2;

[0043] represents

[0044] R 13 R 14 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and any one or more non - adjacent - CH2 - groups in the group shown by R 13 are optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; X3 - X8 each independently represent H or F.

[0045] The liquid crystal composition in the present invention can be used in the preparation of liquid crystal display elements or liquid crystal displays for mobile phones and tablet computers.

[0046] The second object of the present invention is to provide 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 addressed display element or a passive matrix addressed display element.

[0047] Furthermore, the liquid crystal display element is a liquid crystal display element for mobile phones and tablet computers.

[0048] The second object of the present invention is to provide a liquid crystal display, which comprises the liquid crystal composition of the present invention, and the liquid crystal display is an active matrix addressed display or a passive matrix addressed display.

[0049] Furthermore, the liquid crystal display is a liquid crystal display for mobile phones and tablet computers.

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

[0051] In the liquid crystal composition provided in the present invention, the combination of the compounds shown in Formula I and Formula II makes the liquid crystal composition have the characteristics of fast response speed, high optical anisotropy, high dielectric anisotropy, and low energy consumption. Its dielectric anisotropy Δε is 10 - 12, the optical anisotropy Δn is 0.120 - 0.130, and the clearing point Cp is 80 - 90 °C, which is particularly suitable for the display fields of mobile phones and tablet computers. The display panels of mobile phones and tablet computers prepared therefrom are thin, light, have a fast response speed, and low energy consumption. Detailed implementation mode

[0052] 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.

[0053] [Liquid crystal composition]

[0054] A 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,

[0055]

[0056] Wherein:

[0057] R1 represents an alkyl group having 1 to 10 carbon atoms; Y1 represents CF3 or OCF3;

[0058] R2 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 one or more non-consecutive -CH2- in the group represented by R2 are optionally replaced by cyclopentylene, cyclobutylene or cyclopropylene;

[0059] Y2 represents F, CF3 or OCF3;

[0060] Each independently represents

[0061] Represents

[0062] p represents 1 or 2;

[0063] Wherein, by mass percentage, in the liquid crystal composition, it contains 10 to 19% of the compound represented by Formula I, and 26 to 34% of the compound represented by Formula II.

[0064] Preferably, the R1 represents an alkyl group having 1 to 5 carbon atoms.

[0065] Preferably, the compound represented by the foregoing Formula I is selected from the group consisting of the compounds represented by Formula I1 to I6:

[0066]

[0067] Preferably, the compound represented by the foregoing Formula II comprises one or more selected from the group consisting of the compounds represented by Formula II1 to II14:

[0068]

[0069]

[0070] Among them, R2 represents an alkyl group having 1 to 10 carbon atoms, and one or more non-consecutive -CH2- in the group represented by R2 are optionally replaced by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group.

[0071] In the liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula III:

[0072]

[0073] Among them, 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.

[0074] 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.

[0075] Preferably, the aforementioned compound represented by Formula III is selected from the group consisting of compounds represented by Formula III1 to III12:

[0076]

[0077] In the liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula IV:

[0078]

[0079] Among them, 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.

[0080] The compound represented by Formula IV has large optical anisotropy, low rotational viscosity and large splay elastic constant, which is beneficial to improving the response speed of the liquid crystal composition.

[0081] Preferably, the aforementioned compound represented by Formula IV is selected from the group consisting of compounds represented by Formula IV1 or IV2:

[0082]

[0083] In the liquid crystal composition of the present invention, preferably, the aforementioned liquid crystal composition further comprises one or more compounds represented by Formula V:

[0084]

[0085] 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, 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.

[0086] 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.

[0087] Preferably, the compound represented by the foregoing Formula V is selected from the group consisting of the compounds represented by Formulae V1 to V7:

[0088]

[0089] The liquid crystal composition of the present invention, preferably, the foregoing liquid crystal composition further comprises one or more compounds represented by Formula VI:

[0090]

[0091] Among them, R9 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 R9 is optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group;

[0092] represents

[0093] The compound represented by Formula VI has a high optical anisotropy, a high dielectric anisotropy, and a low rotational viscosity, and can maintain a low rotational viscosity while increasing the optical anisotropy and dielectric anisotropy of the liquid crystal composition.

[0094] Preferably, the compound represented by the foregoing Formula VI is selected from the group consisting of the compounds represented by Formulae VI1 to VI12:

[0095]

[0096] The liquid crystal composition of the present invention, preferably, the foregoing liquid crystal composition further comprises one or more compounds represented by Formula VII:

[0097]

[0098] Among them, R 10 represents an alkyl group having 1 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.

[0099] The compound represented by Formula VII is beneficial to improving the reliability of the liquid crystal composition.

[0100] Preferably, the compound shown in the foregoing formula VII is selected from the group consisting of the compounds shown in formulas VII1 to VII5:

[0101]

[0102] The liquid crystal composition of the present invention, preferably, the foregoing liquid crystal composition further comprises one or more compounds shown in formula VIII:

[0103]

[0104] wherein, R 11 represents an alkyl group having 1 to 10 carbon atoms; Y3 represents CF3 or OCF3;

[0105] represents represents

[0106] Preferably, the compound shown in the foregoing formula VIII is selected from the group consisting of the compounds shown in formulas VIII1 to VIII4:

[0107]

[0108] The liquid crystal composition of the present invention, preferably, the foregoing liquid crystal composition further comprises one or more compounds shown in formula IX and one or more compounds shown in formula X:

[0109]

[0110] wherein, R 12 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, and any one or more non-connected -CH2- in the group represented by R 12 is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; Y4 represents H or CH3; X1 and X2 each independently represent H or F, and X1 and X2 do not simultaneously represent F; q represents 1 or 2;

[0111] represents

[0112] R 13 and R 14 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, and any one or more non-connected -CH2- in the group represented by R 13 is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene, and R 13 and R 14When representing an alkenyl group, it is not directly connected to the benzene ring; X3 to X8 each independently represent H or F.

[0113] The co - use of the compound represented by Formula IX and the compound represented by Formula X is beneficial to improving the optical anisotropy and the clearing point of the liquid crystal composition, and maintaining a low rotational viscosity and a high reliability.

[0114] Preferably, the compound represented by the aforementioned Formula IX is selected from the group consisting of the compounds represented by Formula IX1 to Formula IX16,

[0115]

[0116]

[0117] wherein, R 12 represents an alkyl group having 1 to 10 carbon atoms, and any one or more non - adjacent - CH2 - groups in the group represented by R 12 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group.

[0118] Preferably, the compound represented by the aforementioned Formula X is selected from the group consisting of the compounds represented by Formula X1 to Formula X3,

[0119]

[0120] wherein, R 13 , R 14 each independently represent 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 - groups in the group represented by R 13 are optionally substituted by a cyclopentylene group, a cyclobutylene group or a cyclopropylene group; at least one of R 13 , R 14 represents an alkenyl group, and when R 13 , R 14 represent an alkenyl group, they are not directly connected to the benzene ring.

[0121] Examples of the aforementioned alkyl group having 1 to 10 carbon atoms include, for example, methyl, ethyl, n - propyl, isopropyl, n - butyl, isobutyl, tert - butyl, n - pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, decyl, etc.

[0122] Examples of the aforementioned alkoxy group having 1 to 10 carbon atoms include, for example, methoxy, ethoxy, n - propoxy, isopropoxy, n - butoxy, isobutoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, nonyloxy, decyloxy, etc.

[0123] Examples of the alkenyl group having 2 to 10 carbon atoms include vinyl, 1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, etc.

[0124] 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, etc.

[0125] The liquid crystal composition provided by the present invention has a dielectric anisotropy Δη of 10 to 12, an optical anisotropy Δn of 0.120 to 0.130, preferably 0.125 to 0.130, and a clearing point Cp of 80 to 90 °C, preferably 81 to 88 °C.

[0126] In the liquid crystal composition provided by the present invention, the total mass percentage of other compounds except additives is 100%.

[0127] The aforementioned liquid crystal composition contains by mass percentage:

[0128] Preferably, the mass percentage content of the compound represented by formula I is 10 to 19%, more preferably, the mass percentage content of the compound represented by formula I is 12 to 18%, and even more preferably, the mass percentage content of the compound represented by formula I is 14 to 17%;

[0129] Preferably, the mass percentage content of the compound represented by formula II is preferably 26 to 34%, more preferably, the mass percentage content of the compound represented by formula II is 30 to 33%;

[0130] Preferably, the mass percentage content of the compound represented by formula III is 46.5 to 52%, more preferably, the mass percentage content of the compound represented by formula III is 48 to 51%;

[0131] Preferably, the mass percentage content of the compound represented by formula IV is 0 to 4%, more preferably, the mass percentage content of the compound represented by formula IV is 1 to 4%;

[0132] Preferably, the mass percentage content of the compound shown in formula V is 0 to 4%, and further preferably, the mass percentage content of the compound shown in formula V is 2 to 4%;

[0133] Preferably, the mass percentage content of the compound shown in formula VI is 4 to 10%, and further preferably, the mass percentage content of the compound shown in formula VI is 5 to 6%;

[0134] Preferably, the mass percentage content of the compound shown in formula VII is 0.1 to 1%, and further preferably, the mass percentage content of the compound shown in formula VII is 0.5 to 1%;

[0135] Preferably, the mass percentage content of the compound shown in formula VIII is 0 to 5%, and further preferably, the mass percentage content of the compound shown in formula VIII is 2 to 5%;

[0136] Preferably, the mass percentage content of the compound shown in formula IX and the compound shown in formula X is 0 to 4%.

[0137] 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 and 1%. These dopants can include, for example, antioxidants, ultraviolet absorbers, and chiral agents.

[0138] Antioxidants can include,

[0139]

[0140] wherein, t represents an integer from 1 to 10.

[0141] Chiral agents (left-handed or right-handed) preferably can include, for example:

[0142]

[0143] [Liquid crystal display element or liquid crystal display]

[0144] To achieve the above second object, the present invention provides the following technical solution:

[0145] 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.

[0146] Further, the liquid crystal display element is a liquid crystal display element of a mobile phone or a tablet computer.

[0147] To achieve the above third object, the present invention provides the following technical solution:

[0148] 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.

[0149] Further, the liquid crystal display is a liquid crystal display of a mobile phone or a tablet computer.

[0150] For the aforementioned active matrix display element or display, specifically, for example, a TN-TFT or IPS-TFT or FFS-TFT liquid crystal display element or other TFT displays can be cited.

[0151] The liquid crystal display element or liquid crystal display of the present invention contains the liquid crystal composition disclosed in the present invention, and has the characteristics of a thin and light panel, fast response speed, and low energy consumption.

[0152] For the liquid crystal display element and liquid crystal display of the present invention, as long as they contain the liquid crystal composition of the present invention, there are no restrictions on their structures, and those skilled in the art can select the appropriate structures of the liquid crystal display element and liquid crystal display according to the required performance.

[0153] Examples

[0154] 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.

[0155] 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:

[0156] Cp represents the liquid crystal clearing point (°C), tested by DSC quantitative method;

[0157] 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;

[0158] 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;

[0159] K 11 is the splay elastic constant, and the test conditions are: 25 ± 2 °C, INSTEC: ALCT-CUST-4C, 20 μm parallel cell;

[0160] Vop represents the driving voltage (v). The test conditions are 25 ± 0.5 °C. The test instrument is DMS-501. The test cell is an IPS test cell. The electrode spacing and electrode width are both 10 microns. The angle between the rubbing direction and the electrode is 10°;

[0161] τ represents the response time (ms). The test instrument is DMS-501. The test conditions are 25 ± 0.5 °C. The test cell is an IPS test cell. The electrode spacing and electrode width are both 10 microns. The angle between the rubbing direction and the electrode is 10°;

[0162] γ1 represents the rotational viscosity (mPa·s). The test conditions are 25 ± 0.5 °C, a 20-micron antiparallel cell, and INSTEC: ALCT-CUST-4C test.

[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 to heat and melt it. 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 liquid crystal monomer structures 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.

[0165] Table 1 Corresponding codes for the ring structure

[0166]

[0167]

[0168] Table 2 Corresponding codes for the end groups and linking groups

[0169]

[0170] For example:

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

[0172] Its code is CPWP-3-T;

[0173] Its code is APUQU-Cp-F;

[0174] Its code is DPUQU-3-F;

[0175] Its code is CC-3-V1;

[0176] Its code is PP-1-2V1;

[0177] Its code is CPP-1V-2;

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

[0179] Its code is PPGU-3-F;

[0180] Its code is CPUP-3-OT;

[0181] Its code is PGP-3-V1.

[0182] Example 1

[0183] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0184] Table 3 Formulation of the liquid crystal composition of Example 1 and the corresponding properties

[0185]

[0186]

[0187] Example 2

[0188] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0189] Table 4 Formulation of the liquid crystal composition of Example 2 and the corresponding properties

[0190]

[0191] Example 3

[0192] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0193] Table 5 Formulation of the liquid crystal composition of Example 3 and the corresponding properties

[0194]

[0195]

[0196] Example 4

[0197] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0198] Table 6 Formulation of the liquid crystal composition of Example 4 and the corresponding properties

[0199]

[0200] Example 5

[0201] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0202] Table 7 Formulation of the liquid crystal composition of Example 5 and the corresponding properties

[0203]

[0204]

[0205] Example 6

[0206] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 8 below.

[0207] Table 8 Formulation of the liquid crystal composition of Example 6 and the corresponding properties

[0208]

[0209]

[0210] Example 7

[0211] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0212] Table 9 Formulation of the liquid crystal composition of Example 7 and the corresponding properties

[0213]

[0214] Example 8

[0215] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0216] Table 10 Formulation of the liquid crystal composition of Example 8 and the corresponding properties

[0217]

[0218]

[0219] Example 9

[0220] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0221] Table 11 Formulation of the liquid crystal composition of Example 9 and the corresponding properties

[0222]

[0223] Example 10

[0224] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0225] Table 12 Formulation of the liquid crystal composition of Example 10 and the corresponding properties

[0226]

[0227]

[0228] Example 11

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

[0230] Table 13 Formulation of the liquid crystal composition of Example 11 and the corresponding properties

[0231]

[0232]

[0233] Example 12

[0234] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0235] Table 14 Formulation of the liquid crystal composition of Example 12 and the corresponding properties

[0236]

[0237] Comparative Example 1

[0238] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 15 below.

[0239] Table 15 Formulation of the liquid crystal composition of Comparative Example 1 and the corresponding properties

[0240]

[0241]

[0242] Compared with Example 10, in the liquid crystal composition of Comparative Example 1, the compound shown in Formula I is not included, and the compounds shown in CPP-3-OT, CPP-4-OT and CPPC-3-3 are increased. Although every effort is made to ensure that the Δε, ε ⊥ , Cp, γ1, K 11Basically the same, but the optical anisotropy Δn of the liquid crystal composition in Comparative Example 1 is significantly smaller than that in Example 10. During the design process of a liquid crystal display, to ensure excellent visual effects, it is necessary to limit the optical retardation of the liquid crystal display. 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 = Δnd, 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 2.8 μm, while the liquid crystal composition of Comparative Example 1 needs to be filled in a liquid crystal panel with a thickness of 3.2 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. Therefore, when having the same retardation, 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.

[0243] Comparative Example 2

[0244] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 16 below.

[0245] Table 16 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 2

[0246]

[0247]

[0248] Compared with Example 10, the liquid crystal composition of Comparative Example 2 does not contain the compound shown in Formula I. Compounds such as CPWP-3-2, CPWP-5-2, CPWP-3-O2, and CPWP-5-O2 with similar structures are used to replace the compound shown in Formula I in equal amounts. Although the structures are similar, the properties differ greatly. The dielectric anisotropy of the liquid crystal composition of Comparative Example 2 decreases significantly compared to 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 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 electrical energy. The increase in rotational viscosity will also slow down the response speed of the liquid crystal composition of Comparative Example 2.

[0249] Comparative Example 3

[0250] The formulation of the liquid crystal composition and the corresponding properties are shown in Table 17 below.

[0251] Table 17 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 3

[0252]

[0253]

[0254] Compared with Example 10, in the liquid crystal composition of Comparative Example 3, the compound shown in Formula II is not included, and the compounds CCU-2-F, CCU-3-F, PGP-3-F, PGP-4-F, PGU-2-F, PGU-3-F, CCGU-3-F are used to replace the compound shown in Formula II. Although every effort is made to ensure that the Δn and K 11 , Cp of the liquid crystal composition of Comparative Example 3 are the same as or similar to those of the liquid crystal composition of Example 10, the Δε of the liquid crystal composition of Comparative Example 3 decreases significantly. Therefore, the liquid crystal composition of Comparative Example 3 requires a higher voltage to complete driving, resulting in higher power consumption.

[0255] Moreover, the rotational viscosity γ1 of the liquid crystal composition of Comparative Example 3 also increases to a certain extent. 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, when the delay amount is the same, the liquid crystal composition can be poured into liquid crystal panels of the same thickness, but the liquid crystal display filled with the liquid crystal composition of Example 10 has a faster response speed.

[0256] Comparative Example 4

[0257] The formulation and corresponding properties of the liquid crystal composition are shown in Table 18 below.

[0258] Table 18 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 4

[0259]

[0260]

[0261] Compared with Example 10, in the liquid crystal composition of Comparative Example 4, the compounds shown in Formula I and Formula II are not included. Compounds with similar structures such as CPWP-3-2, CPWP-5-2, CPWP-3-O2, CPWP-5-O2 are used to replace the compound shown in Formula I in equal amounts. The compounds CCU-2-F, CCU-3-F, PGP-3-F, PGP-4-F, PGU-2-F, PGU-3-F, CCGU-3-F are used to replace the compound shown in Formula II.

[0262] The Δε of the liquid crystal composition of Comparative Example 4 decreases significantly. Therefore, the liquid crystal composition of Comparative Example 4 requires a higher voltage to complete driving, resulting in higher power consumption.

[0263] Moreover, the rotational viscosity γ1 of the liquid crystal composition of Comparative Example 4 increased significantly, and the response speed 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 4 and Example 10 have similar Δn, when the delay amount is the same, the liquid crystal composition can be poured into liquid crystal panels of the same thickness. However, the ratio of γ1 / K 11 of Comparative Example 4 is significantly greater than that of Example 10. Therefore, the liquid crystal display filled with the liquid crystal composition of Example 10 has a faster response speed.

[0264] Comparative Example 5

[0265] The formulation and corresponding properties of the liquid crystal composition are shown in Table 19 below.

[0266] Table 19 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 5

[0267]

[0268]

[0269] Compared with Example 10, the liquid crystal composition of Comparative Example 5 contains a compound represented by Formula II with a mass percentage content of 20%. It can be seen that the dielectric anisotropy of the liquid crystal composition of Comparative Example 5 decreased 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 under the same driving voltage, since the liquid crystal composition of Comparative Example 2 cannot be fully driven, its transmittance will be reduced. To obtain a picture brightness that meets the requirements, the backlight brightness needs to be increased, thus consuming more electric energy. Moreover, the splay elastic constant K 11 of Comparative Example 5 also decreased significantly, resulting in a slower response speed of the liquid crystal composition.

[0270] Comparative Example 6

[0271] The formulation and corresponding properties of the liquid crystal composition are shown in Table 20 below.

[0272] Table 20 Formulation and Corresponding Properties of the Liquid Crystal Composition of Comparative Example 6

[0273]

[0274]

[0275] Compared with Example 10, the liquid crystal composition of Comparative Example 6 contains a compound represented by Formula II with a mass percentage content of 36%. The liquid crystal composition of Comparative Example 6 exhibited crystallization after 240 hours at room temperature of 25 ± 2 °C, failing to meet the requirements for normal use.

[0276] Table 21 below shows the test data of the normal temperature driving voltage and response time of the liquid crystal compositions of Example 10 and Comparative Examples.

[0277] Table 21 Test Data of the Normal Temperature Driving Voltage and Response Time of the Liquid Crystal Compositions of Example 10 and Comparative Examples

[0278] Δε Vop(v) Δn d(μm) <![CDATA[γ1 / K 11 > τ(ms) Example 10 11.8 3.1 0.125 2.8 3.15 11.5 Comparative Example 1 11 3.3 0.114 3.2 3.08 17.2 Comparative Example 2 10.7 3.5 0.126 2.8 3.67 12.8 Comparative Example 3 5.9 5.0 0.125 2.8 3.86 8.6 Comparative Example 4 4.9 6.0 0.127 2.8 4.38 8.4 Comparative Example 5 10.6 3.5 0.126 2.8 3.41 12.6

[0279] Since the test of the response time needs to be driven at the same driving voltage for comparability, the liquid crystal compositions of Example 10, Comparative Example 1, Comparative Example 2, and Comparative Example 5 with the same or similar dielectric anisotropy are selected for the comparison of the response time. The above test experiment limits the delay amount to 360 nm. Therefore, the liquid crystal compositions of Example 10 and Comparative Example 2 are filled in a liquid crystal panel with a thickness of 2.8 μm, and the liquid crystal composition of Comparative Example 1 is filled in a liquid crystal panel with a thickness of 3.2 μm. It can be seen that the response time of Example 10 is the shortest and the response speed is the fastest.

[0280] Moreover, from Table 21 above, it can be seen that compared with Example 10, the driving voltages of the liquid crystal compositions of Comparative Examples 3 and 4 are significantly greater than that of Example 10, and more electric energy needs to be consumed during the same working process.

[0281] In summary, the liquid crystal composition provided by the present invention has the characteristics of fast response speed, high optical anisotropy, high dielectric anisotropy, and low energy consumption. The liquid crystal display element and liquid crystal display of the present invention have the characteristics of thin and light panel, fast response speed, and low energy consumption by including the liquid crystal composition of the present invention described above.

[0282] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on 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 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 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 one or more non-adjacent -CH2- in the group represented by R2 are optionally replaced by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group; Y2 represents F, CF3, or OCF3; , each independently represents , , , , or ; represent and and or ; p represents 1 or 2; wherein, by mass percentage, the liquid crystal composition contains 10 to 19% of the compound represented by Formula I and 26 to 34% of the compound represented by Formula II; 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, characterized in that, 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 any one or more non-adjacent -CH2- in the group represented by R9 are optionally replaced by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group; indicate or 。 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, and R 10 any one or more non-connected -CH2- in the shown group is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene.

6. The liquid crystal composition according to claim 1, wherein 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; Y3 represents CF3 or OCF3; represent or ; represent or .

7. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains one or more compounds represented by Formula IX and one or more compounds represented by Formula X: Ⅸ； Ⅹ； Among them, R 12 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, and any one or more non-connected -CH2- in the group represented by R 12 is optionally substituted by cyclopentylene, cyclobutylene or cyclopropylene; Y4 represents H or CH3; X1 and X2 each independently represent H or F, and X1 and X2 do not simultaneously represent F; q represents 1 or 2; indicate 、 or ; R 13 、R 14 each independently represents 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 any one or more non-adjacent -CH2- groups in the group represented by R 13 are optionally substituted by a cyclopentylene group, a cyclobutylene group, or a cyclopropylene group; X3 to X8 each independently represents H or F.

8. A liquid crystal display element, characterized in that, It includes the liquid crystal composition according to any one of claims 1 to 7, and the liquid crystal display element is an active matrix display element or a passive matrix display element.

9. A liquid crystal display, characterized in that, It includes the liquid crystal composition according to any one of claims 1 to 7, and the liquid crystal display is an active matrix display or a passive matrix display.

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