Quick-response liquid crystal composition and application thereof

Abstract

The invention discloses a quick-response liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The liquid crystal composition comprises 30%-75% of at least one compound with a structure shown in a general formula A, 5%-40% of at least one compound with a structure shown in a general formula B, 15%-40% of at least one compound with a structure shown in a general formula C, 0%-25% of at least one compound with a structure shown in a general formula D, 0%-25% of at least one compound with a structure shown in a general formula C, 0%-25% of at least one compound with a structure shown in a general formula D and 0%-25% of at least one compound with a structure shown in a general formula E, 0%-15% of at least one compound with a structure shown in a general formula E of which the general formula D is # imgabs3 #, and the general formula E is # imgabs4 #. The liquid crystal composition provided by the invention can enable a liquid crystal display device to realize rapid switching of pictures and has higher response speed, and meanwhile, the composition has larger dielectric, so that the liquid crystal display device can realize low-voltage driving and more energy consumption is saved.

Description

Technical Field

[0001] The invention discloses a fast-response liquid crystal composition and application thereof. The liquid crystal material has large positive dielectric anisotropy, large optical anisotropy, low rotational viscosity and fast response speed, high clearing point and excellent low-temperature storage stability, excellent performance, and can be well applied to display modes such as TN, IPS, and FFS, and belongs to the technical field of liquid crystal materials. Background Art

[0002] In recent years, e-sports, as an emerging sport, has received more and more attention. With the continuous development of e-sports, the requirements for virtual environment presentation are getting higher and higher, requiring display devices to have high resolution, high contrast, and be able to quickly switch screens. Among them, it is particularly important to improve the speed of screen switching.

[0003] If a liquid crystal display is to have a fast response speed, the liquid crystal material used needs to have a fast response time and low rotational viscosity. At the same time, appropriately increasing the optical anisotropy is also very effective in reducing the thickness of the liquid crystal layer and thus improving the response time.

[0004] In practical applications, it is impossible to achieve the above conditions through a single compound, and it is usually achieved by combining multiple compounds. The selection and proportion of different liquid crystal compounds have a direct impact on the performance of the liquid crystal material. Summary of the invention

[0005] In order to improve the resolution and contrast of display devices and increase the switching speed of screens, the present invention provides a positive liquid crystal composition with the characteristics of low viscosity and fast response time, which can enable liquid crystal displays to achieve faster response speeds.

[0006] The liquid crystal composition provided by the present invention has a wide nematic phase temperature range, low rotational viscosity, fast response time, and large optical anisotropy, which can effectively reduce the thickness of the liquid crystal layer to further improve the response time. At the same time, it has large dielectric anisotropy and can effectively reduce the power consumption of the liquid crystal device.

[0007] The liquid crystal composition of the present application is suitable for TN, IPS, and FFS display modes. In particular, it has obvious advantages in the field of e-sports. It has a wide nematic phase temperature range, low rotational viscosity, fast response time, and large optical anisotropy, which can effectively reduce the thickness of the liquid crystal layer and thus improve the response time. At the same time, it has large dielectric anisotropy and can effectively reduce power consumption.

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

[0009] A fast-response liquid crystal composition comprises the following components in terms of mass percentage:

[0010] (1) A compound containing at least one or more structures represented by general formula A, with a mass fraction of 30% to 75%, wherein the general formula A is:

[0011]

[0012] In the above formula, R 1 , R 2 Each independently represents a straight-chain alkyl or straight-chain alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms, n 1 Represents 0 or 1;

[0013] ring With Ring Each independently represents:

[0014] (2) A compound containing at least one or more compounds of the structure represented by general formula B, with a mass fraction of 5% to 40%, wherein the general formula of general formula B is:

[0015]

[0016] In the above formula, R 3 and R 4 Each independently represents a straight-chain alkyl or straight-chain alkoxy group having 1 to 5 carbon atoms, or a straight-chain alkenyl group having 2 to 5 carbon atoms;

[0017] (3) A compound containing at least one or more structures represented by general formula C, with a mass percentage of 15% to 40%, wherein the general formula of general formula C is:

[0018]

[0019] In the above formula, R 5 represents a straight chain alkyl group with 1 to 5 carbon atoms; n 2 Represents 0 or 1;

[0020] ring and ring The same or different, each independently represents: wherein one or more H on the benzene ring may be replaced by F;

[0021] (4) A compound containing at least one or more structures represented by general formula D, with a mass percentage of 0% to 25%, wherein the general formula D is:

[0022]

[0023] In the above formula, R6 represents a straight-chain alkyl group with 1 to 5 carbon atoms; n 3 Represents 0 or 1; L 1 , L 2 Each independently represents H or F;

[0024] (5) A compound containing at least one or more structures represented by general formula E, with a mass percentage of 0% to 15%, wherein the general formula E is:

[0025]

[0026] In the above formula, R 7 It represents a straight-chain alkyl group having 1 to 5 carbon atoms.

[0027] Preferably, the liquid crystal compound contains at least one or more compounds with a structure represented by general formula D and / or at least one or more compounds with a structure represented by general formula E, wherein the mass percentage of the compound with a structure represented by general formula D is 0.5%-20%, and the mass percentage of the compound with a structure represented by general formula E is 0.5%-15%.

[0028] Preferably, the mass percentage of the compound with the structure represented by the general formula D is 1%-20%, and the mass percentage of the compound with the structure represented by the general formula E is 1%-15%.

[0029] Preferably, the compound represented by general formula A is selected from one or more of the following compounds A-1 to A-24:

[0030]

[0031]

[0032] More preferably, the compound represented by general formula A is selected from one or more of compounds A-2, A-5, A-8 and A-19.

[0033] In the liquid crystal composition, the mass percentage of the compound represented by general formula A is 30% to 75%, preferably 35% to 72%, and more preferably 40% to 68%.

[0034] Preferably, the compound represented by general formula B is selected from one or more of the following compounds B-1 to B-14:

[0035]

[0036]

[0037] More preferably, the compound represented by general formula B is selected from one or more of compounds B-1, B-7 and B-11.

[0038] In the liquid crystal composition, the mass percentage of the compound represented by general formula B is 5% to 40%, preferably 8% to 35%, and more preferably 10% to 30%.

[0039] Preferably, the compound represented by general formula C is selected from one or more of the following compounds C-1 to C-22:

[0040]

[0041]

[0042] More preferably, the compound represented by general formula C is selected from one or more of compounds C-3, C-4, C-5, C-9, C-10, C15 and C-20.

[0043] In the liquid crystal composition, the mass percentage of the compound represented by general formula C is 15% to 48%, preferably 17% to 45%, and more preferably 20% to 40%.

[0044] Preferably, the compound represented by general formula D is selected from one or more of the following compounds D-1 to D-24:

[0045]

[0046]

[0047]

[0048] More preferably, the compound represented by general formula D is selected from one or more of compounds D-2, D-6, D-14 and D-22.

[0049] In the liquid crystal composition, the lower limit of the mass percentage of the compound of formula D may be 0%, 0.5%, 1%, 3% or 5%, and the upper limit of the mass percentage may be 25%, 21%, 20% or 18%.

[0050] In the liquid crystal composition, the mass percentage of the compound represented by general formula D is 0% to 25%, preferably 0% to 21%, and more preferably 0% to 18%.

[0051] Preferably, the compound represented by general formula E is selected from one or more of the following compounds E-1 to E-5:

[0052]

[0053] More preferably, the compound represented by general formula E is compound E-3.

[0054] In the liquid crystal composition, the lower limit of the mass percentage of the compound of formula E may be 0%, 0.5%, 1%, 3% or 5%, and the upper limit of the mass percentage may be 15%, 13%, 11% or 10%.

[0055] In the liquid crystal composition, the mass percentage of the compound represented by general formula E is 0% to 15%, preferably 0% to 13%, and more preferably 0% to 10%.

[0056] The sum of the masses of the compounds represented by the structures represented by the general formula A, the general formula B, the general formula C, the general formula D and the general formula E is 100%.

[0057] Preferably, the liquid crystal composition comprises the following components in percentage by mass:

[0058] (1) 30-75% of the compound represented by general formula A;

[0059] (2) 5 to 40% of the compound represented by general formula B;

[0060] (3) 15 to 40% of the compound represented by the general formula C;

[0061] (4) 0 to 20% of a compound represented by formula D;

[0062] (5) 0 to 15% of the compound represented by the general formula E.

[0063] Preferably, the liquid crystal composition comprises the following components in percentage by mass:

[0064] (1) 35-72% of the compound represented by general formula A;

[0065] (2) 8 to 28% of the compound represented by general formula B;

[0066] (3) 17 to 42% of the compound represented by the general formula C;

[0067] (4) 0 to 17% of the compound represented by the general formula D;

[0068] (5) 0 to 13% of the compound represented by the general formula E.

[0069] More preferably, the liquid crystal composition comprises the following components in percentage by mass:

[0070] (1) 40 to 68% of the compound represented by general formula A;

[0071] (2) 10 to 30% of the compound represented by general formula B;

[0072] (3) 20 to 40% of the compound represented by general formula C;

[0073] (4) 0 to 15% of a compound represented by formula D;

[0074] (5) 0 to 10% of the compound represented by the general formula E.

[0075] The liquid crystal composition of the present invention has a higher nematic phase temperature range, larger optical anisotropy, extremely fast response time, low rotational viscosity and larger dielectric anisotropy, and can be used in display modes such as TN, IPS, and FFS, and in particular, has obvious advantages in the field of e-sports. The liquid crystal composition provided by the present invention can enable the liquid crystal display device to achieve fast switching of the screen and has a faster response speed. At the same time, the composition has a larger dielectric constant, which can enable the liquid crystal display device to achieve low-voltage driving and save more energy.

[0076] Advantages of the present invention:

[0077] The liquid crystal composition provided by the present invention can enable a liquid crystal display device to achieve rapid screen switching and have a faster response speed. At the same time, the composition has a large dielectric anisotropy and can effectively reduce the power consumption of the display device.

[0078] The liquid crystal composition provided by the present invention has a high nematic phase temperature range, large optical anisotropy, extremely fast response time, low rotational viscosity and large dielectric anisotropy. Fast response time and low rotational viscosity are conducive to achieving faster response speed of liquid crystal devices; large optical anisotropy is very effective in reducing the thickness of the liquid crystal layer and thus improving the response time; large dielectric anisotropy is conducive to reducing the driving voltage, thereby making the liquid crystal device more energy-efficient.

[0079] The liquid crystal composition of the present invention has a high nematic phase temperature range, large optical anisotropy, extremely fast response time, low rotational viscosity and large dielectric anisotropy, and can be applied to display modes such as TN, IPS, and FFS. The liquid crystal composition provided by the present invention can enable the liquid crystal display device to achieve fast screen switching and have a faster response speed. At the same time, the composition has a large dielectric constant, which can enable the liquid crystal display device to achieve low voltage driving and save more energy consumption. DETAILED DESCRIPTION

[0080] The abbreviated codes for the test items in the following embodiments are as follows:

[0081] Tni: Clear Point

[0082] no: refractive index of ordinary light (589nm, 25℃);

[0083] ne: refractive index of extraordinary light (589nm, 25℃);

[0084] Δn: refractive index anisotropy (589nm, 25℃);

[0085] Δε: dielectric anisotropy (1KHz, 25℃);

[0086] γ1: rotational viscosity at 25 degrees Celsius (°C) (mPa·s);

[0087] ton+toff: response time (ms) at 25 degrees Celsius (℃);

[0088] Among them, Δε=ε∥-ε⊥, where ε∥ is the dielectric constant parallel to the molecular axis, and ε⊥ is the dielectric constant perpendicular to the molecular axis. The test conditions are: 25°C, 1KHz.

[0089] Table 1 Liquid crystal compound functional group code

[0090]

[0091]

[0092] Take the following compound structure as an example:

[0093]

[0094] Functional group code: 3CPGUOCF3

[0095]

[0096] Functional group code: V2PGP2

[0097]

[0098] Functional group code: 3APUQUF

[0099] According to the mass percentage in the embodiment, weigh the compound of the corresponding general structure, place the weighed monomer in a hard borosilicate glass bottle, heat it under nitrogen protection, stir it by electromagnetic or mechanical stirring until it becomes a molten, clear, uniform and transparent solution, and continue stirring for 30 minutes to make the materials thoroughly and evenly mixed, then stop heating. Degas under reduced pressure while stirring; as the temperature decreases, the vacuum degree increases until the temperature cools to room temperature, stop stirring, and continue to evacuate until no bubbles appear. Then it can be poured into the test box for testing.

[0100] The following takes Example 3 as an example to illustrate the preparation method of the liquid crystal compound of the embodiment of the present invention. The preparation steps of other embodiments are the same.

[0101] According to the mass percentage in Example 3, 37.5% of the compound of formula A-2, 6% of the compound of formula A-5, 6.5% of the compound of formula A-8, 8.5% of the compound of formula A-19, 8% of the compound of formula B-1, 5% of the compound of formula B-11, 3% of the compound of formula C-3, 2% of the compound of formula C-4, 2% of the compound of formula C-5, 3% of the compound of formula C-9, 4% of the compound of formula C-10, 10% of the compound of formula C-15, and 4.5% of the compound of formula E-5 were weighed. The weighed monomers were placed in a hard borosilicate glass bottle, heated under nitrogen protection, and stirred by electromagnetic or mechanical stirring until a molten, clear, uniform and transparent solution was obtained, and then continued to stir for 30 minutes to allow the materials to be thoroughly and evenly mixed and then stop heating. Degas under reduced pressure while stirring; as the temperature decreases, the vacuum degree increases until the temperature cools to room temperature, then stop stirring and continue to evacuate until no bubbles appear. Then you can fill the test box and conduct the test.

[0102] The following are some representative embodiments, but the present invention is not limited to these liquid crystal compositions.

[0103] Example 1: A liquid crystal composition was prepared according to the method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 2.

[0104] Table 2 Composition and properties of the liquid crystal composition of Example 1

[0105]

[0106] Example 2: A liquid crystal composition was prepared according to the method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 3.

[0107] Table 3 Composition and properties of the liquid crystal composition of Example 2

[0108]

[0109] Example 3: A liquid crystal composition was prepared according to the method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 4.

[0110] Table 4 Composition and properties of the liquid crystal composition of Example 3

[0111]

[0112]

[0113] Example 4: A liquid crystal composition was prepared according to the method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 5.

[0114] Table 5 Composition and properties of the liquid crystal composition of Example 4

[0115]

[0116]

[0117] Example 5: A liquid crystal composition was prepared according to the above method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 6.

[0118] Table 6 Composition and properties of the liquid crystal composition of Example 5

[0119]

[0120]

[0121] Example 6: A liquid crystal composition was prepared according to the above method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 7.

[0122] Table 7 Composition and properties of the liquid crystal composition of Example 6

[0123]

[0124]

[0125] Example 7: A liquid crystal composition was prepared according to the method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 8.

[0126] Table 8 Composition and properties of the liquid crystal composition of Example 7

[0127]

[0128] Example 8: A liquid crystal composition was prepared according to the above method of the present invention, and was filled with liquid crystal for testing and performance testing. The results of the measured physical parameters are shown in Table 9.

[0129] Table 9 Composition and properties of the liquid crystal composition of Example 8

[0130]

[0131] From the above examples, it can be seen that the liquid crystal composition provided by the present invention has a higher clearing point, low rotational viscosity, fast response time, and large optical anisotropy, which can effectively reduce the thickness of the liquid crystal layer to further improve the response time; at the same time, it has a large dielectric anisotropy, which can effectively reduce the power consumption of the liquid crystal device. The liquid crystal material is suitable for display modes such as TN, IPS, and FFS, and in particular, it has obvious advantages in the field of e-sports.

Claims

1. A fast-response liquid crystal composition, Features: According to mass percentage, it includes the following components: (1) at least one compound of the structure represented by general formula A, with a mass fraction of 30% to 75%, wherein general formula A is: In the formula, R 1 , R 2 Each independently represents a straight-chain alkyl or straight-chain alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 5 carbon atoms, n 1 Represents 0 or 1; ring With Ring Each independently represents: (2) at least one compound of the structure represented by general formula B, with a mass fraction of 5% to 40%, wherein general formula B is: In the formula, R 3 and R 4 Each independently represents a straight-chain alkyl or straight-chain alkoxy group having 1 to 5 carbon atoms, or a straight-chain alkenyl group having 2 to 5 carbon atoms; (3) at least one compound of the structure represented by general formula C, the mass percentage of which is 15% to 40%, wherein general formula C is: In the formula, R 5 represents a straight chain alkyl group with 1 to 5 carbon atoms; n 2 Represents 0 or 1; ring and ring The same or different, each independently represents: wherein one or more H on the benzene ring may be replaced by F; (4) at least one compound of the structure represented by the general formula D, the mass percentage of which is 0% to 25%, the general formula D being: In the formula, R 6 represents a straight-chain alkyl group with 1 to 5 carbon atoms; n 3 Represents 0 or 1; L 1 , L 2 Each independently represents H or F; (5) at least one compound of the structure represented by the general formula E, the mass percentage of which is 0% to 15%, the general formula E being: In the formula, R 7 It represents a straight-chain alkyl group having 1 to 5 carbon atoms.

2. The fast-response liquid crystal composition according to claim 1, Features: The liquid crystal compound comprises at least one compound of the structure shown in general formula D and / or at least one compound of the structure shown in general formula E, the mass percentage of the compound of the structure shown in general formula D is 0.5%-20%, and the mass percentage of the compound of the structure shown in general formula E is 0.5%-15%.

3. The fast-response liquid crystal composition according to claim 1, Features: The compound represented by general formula A is selected from one or more of compounds A-1 to A-24:

4. The fast-response liquid crystal composition according to claim 1, Features: The compound represented by general formula B is selected from one or more of compounds B-1 to B-14:

5. The fast-response liquid crystal composition according to claim 1, Features: The compound represented by general formula C is selected from one or more of compounds C-1 to C-22:

6. The fast-response liquid crystal composition according to claim 1, Features: The compound represented by general formula D is selected from one or more of compounds D-1 to D-24:

7. The fast-response liquid crystal composition according to claim 1, Features: The compound represented by general formula E is selected from one or more of compounds E-1 to E-5:

8. The fast-response liquid crystal composition according to any one of claims 3 to 7, Features: The compound represented by general formula A is selected from one or more of compounds A-2, A-5, A-8 and A-19; the compound represented by general formula B is selected from one or more of compounds B-1, B-7 and B-11; the compound represented by general formula C is selected from one or more of compounds C-3, C-4, C-5, C-9, C-10, C15 and C-20; the compound represented by general formula D is selected from one or more of compounds D-2, D-6, D-14 and D-22; the compound represented by general formula E is compound E-3.

9. The fast-response liquid crystal composition according to claim 1, Features: The mass percentage of the compound with the structure shown by the general formula D is 1%-20%, and the mass percentage of the compound with the structure shown by the general formula E is 1%-15%.

10. Use of the fast-response liquid crystal composition according to any one of claims 1 to 9 in preparing a liquid crystal display device, wherein the liquid crystal display device includes TN, IPS and FFS display modes.

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