Liquid crystal composition and display panel

Abstract

This invention discloses a liquid crystal composition and a display panel. The liquid crystal composition includes at least one first compound, at least one second compound, and at least one third compound. The first compound has a structure as shown in general formula (I), the second compound has a structure as shown in general formula (II-1) or general formula (II-2), and the third compound has a structure as shown in any one of general formulas (III-1) to (III-3). By including the first compound, the second compound, and the third compound in the liquid crystal composition, this invention improves the performance of the liquid crystal composition in terms of viscosity, optical anisotropy, and elastic modulus, thereby improving the product quality of the display panel using the liquid crystal composition.

Description

Technical Field

[0001] This invention relates to the field of displays, and more specifically to a liquid crystal composition and a display panel. Background Technology

[0002] Liquid crystal display (LCD) panels utilize the application of voltage to the liquid crystal layer to control the optical properties of the materials within it, thereby enabling the display function. The physical properties of the liquid crystal material (such as viscosity, clearing point, dielectric anisotropy, optical anisotropy, and elastic modulus) affect the product quality of the LCD panel, in aspects such as response time. Currently, the performance of materials used in the liquid crystal layer still needs improvement, resulting in room for enhancement in the product quality of display panels.

[0003] Therefore, there is an urgent need for a liquid crystal composition and display panel to solve the above-mentioned technical problems. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a liquid crystal composition and a display panel. By adding a first compound, a second compound and a third compound to the liquid crystal composition, the performance of the liquid crystal composition is improved in terms of viscosity, optical anisotropy and elastic coefficient, thereby improving the product quality of the display panel using the liquid crystal composition.

[0005] This invention provides a liquid crystal composition comprising at least one first compound, at least one second compound, at least one third compound, and at least one fourth compound;

[0006] The first compound has a structure as shown in general formula (Ⅰ):

[0007]

[0008] The second compound has a structure as shown in general formula (II-1) or general formula (II-2):

[0009]

[0010]

[0011] The third compound has a structure as shown in any of general formulas (Ⅲ-1) to (Ⅲ-3):

[0012]

[0013]

[0014]

[0015] R1 and R2 are independently selected from H, F, Cl, Br, I, CN, SCN, NCS, SF5, substituted or unsubstituted alkyl groups having 1-15 carbon atoms, substituted or unsubstituted alkoxy groups having 1-15 carbon atoms, substituted or unsubstituted alkenyl groups having 2-15 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-15 carbon atoms, substituted or unsubstituted alkynyl groups having 2-15 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-15 carbon atoms.

[0016] Preferably, the terminal groups of R1 and R2 are independently monosubstituted by H, CN, or CF3, respectively; and / or,

[0017] One or more -CH2- atoms in R1 and R2 are independently replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C-, and the heteroatoms directly bonded to C are not directly bonded to each other. The H atoms in R1 and R2 are not replaced or at least one H atom is replaced by any atom among F, Cl, Br, and I.

[0018] Preferably, the liquid crystal composition further includes at least one fourth compound having a structure as shown in general formula (Ⅳ):

[0019]

[0020] R3 and R4 are independently selected from substituted or unsubstituted alkyl groups having 1-10 carbon atoms, substituted or unsubstituted alkoxy groups having 1-10 carbon atoms, substituted or unsubstituted alkenyl groups having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-10 carbon atoms, substituted or unsubstituted alkynyl groups having 2-10 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-10 carbon atoms. The H in R3 and R4 is not substituted or at least one H is substituted by any one atom of F, Cl, Br, or I.

[0021] Preferably, the fourth compound has a mass fraction greater than or equal to 1% in the liquid crystal composition, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 25%.

[0022] Preferably, the liquid crystal composition further includes at least one fifth compound having a structure as shown in general formula (V):

[0023]

[0024] R5 and R6 are independently selected from substituted or unsubstituted alkyl groups having 1-10 carbon atoms, substituted or unsubstituted alkoxy groups having 1-10 carbon atoms, substituted or unsubstituted alkenyl groups having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-10 carbon atoms, substituted or unsubstituted alkynyl groups having 2-10 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-10 carbon atoms. The H in R5 and R6 is not substituted or at least one H is substituted by any one atom of F, Cl, Br, or I.

[0025] Preferably, the fifth compound has a mass fraction of greater than or equal to 1% in the liquid crystal composition, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 25%.

[0026] Preferably, in the liquid crystal composition, at least one of the second compounds is selected from compounds represented by general formula (II-1), at least one of the third compounds is selected from compounds represented by general formula (III-1), and at least one of the third compounds is selected from compounds represented by (III-2).

[0027] Preferably, at least one of the second compounds is selected from compounds represented by general formula (II-2), and at least one of the third compounds is selected from compounds represented by general formula (III-3).

[0028] Preferably, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 20%, and the mass fraction of the first compound in the liquid crystal composition is less than or equal to 50%.

[0029] The second compound has a mass fraction of 5% or more in the liquid crystal composition, and the mass fraction of the second compound in the liquid crystal composition is less than or equal to 30%.

[0030] The third compound has a mass fraction of greater than or equal to 5% in the liquid crystal composition, and the mass fraction of the third compound in the liquid crystal composition is less than or equal to 40%.

[0031] The present invention also provides a display panel, comprising a first substrate, a second substrate located on the first substrate, and a liquid crystal layer located between the first substrate and the second substrate;

[0032] The liquid crystal layer comprises the liquid crystal composition as described above.

[0033] The present invention improves the performance of liquid crystal compositions in terms of viscosity, optical anisotropy, and elastic modulus by including a first compound, a second compound, and a third compound in the liquid crystal composition, thereby improving the product quality of display panels using the liquid crystal composition. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart of a method for preparing a liquid crystal composition according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a display panel provided in an embodiment of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] Currently, due to the need to improve the performance of materials used in liquid crystal layers, there is still room for improvement in the quality of display panels with liquid crystal layers.

[0039] This invention provides a liquid crystal composition comprising at least one first compound, at least one second compound, and at least one third compound;

[0040] The first compound has a structure as shown in general formula (Ⅰ):

[0041]

[0042] The second compound has a structure as shown in general formula (II-1) or general formula (II-2):

[0043]

[0044]

[0045] The third compound has a structure as shown in any of general formulas (Ⅲ-1) to (Ⅲ-3):

[0046]

[0047]

[0048]

[0049] R1 and R2 are independently selected from H, F, Cl, Br, I, CN, SCN, NCS, SF5, substituted or unsubstituted alkyl groups having 1-15 carbon atoms, substituted or unsubstituted alkoxy groups having 1-15 carbon atoms, substituted or unsubstituted alkenyl groups having 2-15 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-15 carbon atoms, substituted or unsubstituted alkynyl groups having 2-15 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-15 carbon atoms.

[0050] In the liquid crystal composition, the first compound has a low viscosity, which is beneficial to improving the response speed of the display panel when the liquid crystal composition is applied to the display panel, thereby improving the response speed of the display panel when the liquid crystal composition is applied to the display panel.

[0051] In the liquid crystal composition, the second compound is a dielectric negative material with a low clearing point and low viscosity, and can be used to adjust the birefringence difference of the liquid crystal composition, which is beneficial to improving the response speed of the display panel when the liquid crystal composition is applied to the display panel, thereby shortening the response time of the display panel when the liquid crystal composition is applied to the display panel.

[0052] In the liquid crystal composition, the third compound has a higher clearing point, higher viscosity, higher elastic modulus, and a higher absolute value of birefringence difference. It is used to adjust the viscosity of the liquid crystal composition, increase the clearing point of the liquid crystal composition, and improve the display contrast of the display panel when the liquid crystal composition is applied to the display panel, so as to improve the high temperature resistance of the liquid crystal composition and improve the display contrast and product reliability of the display panel when the liquid crystal composition is applied to the display panel.

[0053] The embodiments of the present invention improve the performance of the liquid crystal composition in terms of viscosity, optical anisotropy, and elastic modulus by including a first compound, a second compound, and a third compound in the liquid crystal composition, thereby improving the product quality of the display panel using the liquid crystal composition.

[0054] In some embodiments, the substituted alkyl group having 1-15 carbon atoms, the substituted alkoxy group having 1-15 carbon atoms, the substituted alkenyl group having 2-15 carbon atoms, the substituted alkenyl group having 2-15 carbon atoms, the substituted alkynyl group having 2-15 carbon atoms, and the substituted alkynyl group having 2-15 carbon atoms satisfy at least one of the following conditions:

[0055] The terminal groups are independently monosubstituted by CN or CF3;

[0056] One or more -CH2- groups are independently replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C-, and the heteroatoms directly bonded to C are not directly bonded to each other;

[0057] At least one H in the group is replaced by any one of F, Cl, Br, or I atoms.

[0058] In some embodiments, at least one of R1 and R2 is selected from substituted alkyl groups having 1-15 carbon atoms, substituted alkoxy groups having 1-15 carbon atoms, substituted alkenyl groups having 2-15 carbon atoms, substituted alkenoxy groups having 2-15 carbon atoms, substituted alkynyl groups having 2-15 carbon atoms, and substituted alkynoxy groups having 2-15 carbon atoms.

[0059] In some embodiments, the terminal groups of R1 and R2 are independently monosubstituted by H, CN, or CF3, respectively.

[0060] In some embodiments, one or more -CH2- atoms in R1 and R2 are independently replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2-CH2-, -(CH2)3-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH2O-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-, or -C≡C-, and heteroatoms directly bonded to C are not directly bonded to each other. H atoms in R1 and R2 are not substituted or at least one H atom is substituted by any atom among F, Cl, Br, and I.

[0061] In some embodiments, R1 and R2 are independently selected from H, F, Cl, Br, substituted or unsubstituted alkyl groups having 1-7 carbon atoms, substituted or unsubstituted alkoxy groups having 1-7 carbon atoms, substituted or unsubstituted alkenyl groups having 2-7 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-7 carbon atoms, substituted or unsubstituted alkynyl groups having 2-7 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-7 carbon atoms. When R1 and / or R2 are selected from substituted alkyl groups, substituted alkoxy groups, substituted alkenyl groups, substituted alkenyloxy groups, substituted alkynyl groups, and substituted alkynyloxy groups, at least one H in R1 and / or R2 is substituted by any atom selected from F, Cl, Br, and I.

[0062] Preferably, R1 and R2 are independently selected from H, F, unsubstituted alkyl groups having 1-7 carbon atoms, unsubstituted alkoxy groups having 1-7 carbon atoms, unsubstituted alkenyl groups having 2-7 carbon atoms, unsubstituted alkenyl groups having 2-7 carbon atoms, unsubstituted alkynyl groups having 2-7 carbon atoms, and unsubstituted alkynyl groups having 2-7 carbon atoms.

[0063] More preferably, R1 and R2 are independently selected from H, F, unsubstituted alkyl groups having 1-5 carbon atoms, unsubstituted alkoxy groups having 1-5 carbon atoms, and unsubstituted alkenyl groups having 2-5 carbon atoms.

[0064] In some embodiments, when R1 and R2 are independently selected from unsubstituted alkyl, unsubstituted alkenyl, or unsubstituted alkynyl groups, the unsubstituted alkyl, unsubstituted alkenyl, and unsubstituted alkynyl groups are aliphatic hydrocarbon groups.

[0065] In some embodiments, when R1 and R2 are independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy group can be an unsubstituted straight-chain alkoxy group or an unsubstituted branched-chain alkoxy group, preferably an unsubstituted straight-chain alkoxy group, for example, it can be methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy or heptoxy, etc.

[0066] In some embodiments, when R1 and R2 are each independently selected from unsubstituted alkyl groups, the unsubstituted alkyl group can be an unsubstituted straight-chain alkyl group or an unsubstituted branched alkyl group, preferably an unsubstituted straight-chain alkyl group; when R1 and R2 are each independently selected from unsubstituted straight-chain alkyl groups having 1 to 7 carbon atoms, they can be selected from, for example: methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0067] When R1 and R2 are independently selected from unsubstituted alkenyl groups, the unsubstituted alkenyl group can be an unsubstituted straight-chain alkenyl group or an unsubstituted branched alkenyl group, and the alkenyl group can be an E-configuration or a Z-configuration isomer, and has at least one carbon-carbon double bond. It can be selected from unsubstituted straight-chain alkenyl groups having 2-7 carbon atoms, more preferably vinyl, propenyl, propenyl, butenyl, butenyl, butenyl, butenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, hexenyl, hexenyl, hexenyl, 3-enyl, hexenyl, 4-enyl, hexenyl, 5-enyl, heptenyl, heptenyl, heptenyl, heptenyl, heptenyl, 3-enyl, heptenyl, 4-enyl, heptenyl, 5-enyl, heptenyl, 6-enyl, etc.

[0068] When R1 and R2 are independently selected from unsubstituted alkynyl groups, the unsubstituted alkynyl group can be an unsubstituted straight-chain alkynyl group or an unsubstituted branched-chain alkynyl group, and must have at least one carbon-carbon triple bond. It can be selected from unsubstituted straight-chain alkynyl groups having 2-7 carbon atoms, more preferably ethynyl, propynyl, propynyl-1-alkynyl, propynyl-2-alkynyl, butynyl-1-alkynyl, butynyl-2-alkynyl, butynyl-3-alkynyl, pentynyl-1-alkynyl, or pentynyl-2-alkynyl. , pent-3-ynyl, pent-4-ynyl, hex-1-ynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, hex-5-ynyl, hep-1-ynyl, hep-2-ynyl, hep-3-ynyl, hep-4-ynyl, hep-5-ynyl or hep-6-ynyl, etc.; further preferably prop-2-ynyl, but-2-ynyl, but-3-ynyl, pent-2-ynyl, pent-3-ynyl or pent-4-ynyl.

[0069] In some embodiments, the liquid crystal composition further includes at least one fourth compound having a structure as shown in general formula (Ⅳ):

[0070]

[0071] R3 and R4 are independently selected from substituted or unsubstituted alkyl groups having 1-10 carbon atoms, substituted or unsubstituted alkoxy groups having 1-10 carbon atoms, substituted or unsubstituted alkenyl groups having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-10 carbon atoms, substituted or unsubstituted alkynyl groups having 2-10 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-10 carbon atoms. The H in R3 and R4 is not substituted or at least one H is substituted by any one atom of F, Cl, Br, or I.

[0072] In the liquid crystal composition, the fourth compound has a high absolute value of birefringence difference, moderate viscosity, high clearing point and high elastic coefficient, which is beneficial for adjusting the optical anisotropy, viscosity, clearing point and elastic coefficient of the liquid crystal composition, thereby improving the product quality of the display panel when the liquid crystal composition is applied to the display panel.

[0073] In some embodiments, the substituted alkyl group having 1-10 carbon atoms, the substituted alkoxy group having 1-10 carbon atoms, and the substituted alkenyl group having 2-10 carbon atoms satisfy the following condition: at least one H atom is substituted by any one atom of F, Cl, Br, or I.

[0074] In some embodiments, R3 and R4 are each independently selected from substituted or unsubstituted alkyl groups having 1-7 carbon atoms, substituted or unsubstituted alkoxy groups having 1-7 carbon atoms, and substituted or unsubstituted alkenyl groups having 2-7 carbon atoms. Preferably, R5 and R6 are each independently selected from unsubstituted alkyl groups having 1-7 carbon atoms, unsubstituted alkoxy groups having 1-7 carbon atoms, and unsubstituted alkenyl groups having 2-7 carbon atoms.

[0075] More preferably, R3 and R4 are independently selected from unsubstituted alkyl groups having 1-5 carbon atoms, unsubstituted alkoxy groups having 1-5 carbon atoms, and unsubstituted alkenyl groups having 2-5 carbon atoms.

[0076] In some embodiments, when R3 and R4 are independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy group can be an unsubstituted straight-chain alkoxy group or an unsubstituted branched-chain alkoxy group, preferably an unsubstituted straight-chain alkoxy group, such as methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy, or heptoxy.

[0077] In some embodiments, when R3 and R4 are each independently selected from unsubstituted alkyl groups, the unsubstituted alkyl group can be an unsubstituted straight-chain alkyl group or an unsubstituted branched alkyl group, preferably an unsubstituted straight-chain alkyl group; when R3 and R4 are each independently selected from unsubstituted straight-chain alkyl groups having 1 to 7 carbon atoms, they can be selected from, for example: methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0078] When R3 and R4 are independently selected from unsubstituted alkenyl groups, the unsubstituted alkenyl group can be an unsubstituted straight-chain alkenyl group or an unsubstituted branched alkenyl group, and the alkenyl group can be an E-configuration or a Z-configuration isomer, and has at least one carbon-carbon double bond. It can be selected from unsubstituted straight-chain alkenyl groups having 2-7 carbon atoms, more preferably vinyl, propenyl, propenyl, butenyl, butenyl, butenyl, butenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, hexenyl, hexenyl, hexenyl, 3-enyl, hexenyl, 4-enyl, hexenyl, 5-enyl, heptenyl, heptenyl, heptenyl, heptenyl, 3-enyl, heptenyl, 4-enyl, heptenyl, 5-enyl, heptenyl, 6-enyl, etc.

[0079] In some embodiments, the liquid crystal composition further includes at least one fifth compound having a structure as shown in general formula (V):

[0080]

[0081] R5 and R6 are independently selected from substituted or unsubstituted alkyl groups having 1-10 carbon atoms, substituted or unsubstituted alkoxy groups having 1-10 carbon atoms, substituted or unsubstituted alkenyl groups having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy groups having 2-10 carbon atoms, substituted or unsubstituted alkynyl groups having 2-10 carbon atoms, and substituted or unsubstituted alkynyloxy groups having 2-10 carbon atoms. The H in R5 and R6 is not substituted or at least one H is substituted by any one atom of F, Cl, Br, or I.

[0082] In the liquid crystal composition, the fifth compound has a high clearing point, a low absolute value of the birefringence difference, moderate viscosity, and a high elastic modulus, which is beneficial for adjusting the optical anisotropy, viscosity, clearing point, and elastic modulus of the liquid crystal composition, thereby improving the product quality of the display panel when the liquid crystal composition is applied to the display panel.

[0083] In some embodiments, the substituted alkyl group having 1-10 carbon atoms, the substituted alkoxy group having 1-10 carbon atoms, and the substituted alkenyl group having 2-10 carbon atoms satisfy the following condition: at least one H atom is substituted by any one atom of F, Cl, Br, or I.

[0084] In some embodiments, R5 and R6 are each independently selected from substituted or unsubstituted alkyl groups having 1-7 carbon atoms, substituted or unsubstituted alkoxy groups having 1-7 carbon atoms, and substituted or unsubstituted alkenyl groups having 2-7 carbon atoms. Preferably, R5 and R6 are each independently selected from unsubstituted alkyl groups having 1-7 carbon atoms, unsubstituted alkoxy groups having 1-7 carbon atoms, and unsubstituted alkenyl groups having 2-7 carbon atoms.

[0085] More preferably, R5 and R6 are independently selected from unsubstituted alkyl groups having 1-5 carbon atoms, unsubstituted alkoxy groups having 1-5 carbon atoms, and unsubstituted alkenyl groups having 2-5 carbon atoms.

[0086] In some embodiments, when R5 and R6 are independently selected from unsubstituted alkoxy groups, the unsubstituted alkoxy group can be an unsubstituted straight-chain alkoxy group or an unsubstituted branched-chain alkoxy group, preferably an unsubstituted straight-chain alkoxy group, for example, it can be methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy or heptoxy, etc.

[0087] In some embodiments, when R5 and R6 are each independently selected from unsubstituted alkyl groups, the unsubstituted alkyl group can be an unsubstituted straight-chain alkyl group or an unsubstituted branched alkyl group, preferably an unsubstituted straight-chain alkyl group; when R5 and R6 are each independently selected from unsubstituted straight-chain alkyl groups having 1 to 7 carbon atoms, they can be selected from, for example: methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0088] When R5 and R6 are independently selected from unsubstituted alkenyl groups, the unsubstituted alkenyl group can be an unsubstituted straight-chain alkenyl group or an unsubstituted branched alkenyl group, and the alkenyl group can be an E-configuration or a Z-configuration isomer, and has at least one carbon-carbon double bond. It can be selected from unsubstituted straight-chain alkenyl groups having 2-7 carbon atoms, more preferably vinyl, propenyl, propenyl, butenyl, butenyl, butenyl, butenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, pentenyl, hexenyl, hexenyl, hexenyl, 3-enyl, hexenyl, 4-enyl, hexenyl, 5-enyl, heptenyl, heptenyl, heptenyl, heptenyl, heptenyl, 3-enyl, heptenyl, 4-enyl, heptenyl, 5-enyl, heptenyl, 6-enyl, etc.

[0089] In some embodiments, the first compound has a mass fraction greater than or equal to 20% in the liquid crystal composition and a mass fraction less than or equal to 50% in the liquid crystal composition. For example, the mass fraction of the first compound can be 23%, 25%, 30%, 35%, 4%, 45%, 48%, etc.; the second compound has a mass fraction greater than or equal to 5% in the liquid crystal composition and a mass fraction less than or equal to 30% in the liquid crystal composition. For example, the mass fraction of the second compound can be 8%, 10%, 15%, 20%, 25%, 28%, etc.; the third compound has a mass fraction greater than or equal to 5% in the liquid crystal composition and a mass fraction less than or equal to 40% in the liquid crystal composition. For example, the mass fraction of the third compound can be 8%, 10%, 15%, 20%, 25%, 30%, 35%, etc.

[0090] Preferably, the first compound has a mass fraction greater than or equal to 20% and less than or equal to 45% in the liquid crystal composition. For example, the mass fraction of the first compound can be 22%, 25%, 28%, 30%, 35%, 40%, 42%, etc.; the second compound has a mass fraction greater than or equal to 10% and less than or equal to 30% in the liquid crystal composition. For example, the mass fraction of the second compound can be 12%, 15%, 18%, 20%, 25%, 28%, etc.; the third compound has a mass fraction greater than or equal to 10% and less than or equal to 40% in the liquid crystal composition. For example, the mass fraction of the third compound can be 15%, 18%, 20%, 22%, 25%, 30%, 35%, etc.

[0091] More preferably, the first compound has a mass fraction of 25% or more in the liquid crystal composition and a mass fraction of less than or equal to 40% in the liquid crystal composition. For example, the mass fraction of the first compound can be 28%, 30%, 32%, 35%, 38%, etc.; the second compound has a mass fraction of 15% or more in the liquid crystal composition and a mass fraction of less than or equal to 25% in the liquid crystal composition. For example, the mass fraction of the second compound can be 18%, 20%, 22%, etc.; the third compound has a mass fraction of 20% or more in the liquid crystal composition and a mass fraction of less than or equal to 35% in the liquid crystal composition. For example, the mass fraction of the third compound can be 22%, 25%, 28%, 30%, 32%, 34%, etc.

[0092] In some embodiments, when the liquid crystal composition further includes the fourth compound, the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 25%, for example, it can be 3%, 5%, 10%, 15%, 20%, 22%, etc. Preferably, the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 3%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 20%, for example, it can be 5%, 8%, 10%, 15%, 18%, etc. More preferably, the mass fraction of the fourth compound in the liquid crystal composition is greater than or equal to 3%, and the mass fraction of the fourth compound in the liquid crystal composition is less than or equal to 15%, for example, it can be 5%, 6%, 8%, 10%, 12%, etc.

[0093] In some embodiments, when the liquid crystal composition further includes the fifth compound, the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 25%, for example, it can be 3%, 5%, 10%, 15%, 20%, 22%, etc. Preferably, the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 3%, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 20%, for example, it can be 5%, 8%, 10%, 15%, 18%, etc. More preferably, the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 3%, and the mass fraction of the fifth compound in the liquid crystal composition is less than or equal to 15%, for example, it can be 5%, 6%, 8%, 10%, 12%, etc.

[0094] In some embodiments, in the liquid crystal composition, at least one of the second compounds is selected from compounds represented by general formula (II-1), at least one of the third compounds is selected from compounds represented by general formula (III-1), and at least one of the third compounds is selected from compounds represented by (III-2). The compounds represented by general formula (III-1) and general formula (III-2) have high elastic moduli. Their simultaneous application in the liquid crystal composition effectively improves the elastic moduli of the liquid crystal composition, thereby effectively increasing the contrast of the display panel using the liquid crystal composition, making it suitable for display panels used in applications requiring high contrast. Simultaneously, the compounds represented by general formula (III-1) and general formula (III-2) have high viscosity, while the first compound has low viscosity, effectively reducing the viscosity of the liquid crystal composition, thereby shortening the response time of the display panel when the liquid crystal composition is applied. Furthermore, to shorten the response time of the display panel, the thickness of the liquid crystal layer in the display panel is usually reduced accordingly, and this reduction in the thickness of the liquid crystal layer leads to a decrease in the light transmittance of the display panel. The combination of a first compound, a second compound selected from compounds represented by general formula (II-1), at least one third compound selected from compounds represented by general formula (III-1), and at least one third compound selected from compounds represented by (III-2) facilitates the adjustment of the absolute value of the difference in birefringence of the liquid crystal composition, thereby coordinating with the thickness of the liquid crystal layer in the display panel to effectively compensate for the decrease in light transmittance of the display panel caused by the reduction in the thickness of the liquid crystal layer; when a high-transmittance color resist is used in the color resist layer of the display panel, the light transmittance of the display panel can be effectively improved.

[0095] In some embodiments, at least one of the second compounds is selected from compounds represented by general formula (II-2), and at least one of the third compounds is selected from compounds represented by general formula (III-3). The combination of the first compound, the second compound represented by general formula (II-2), and the third compound represented by general formula (III-3) is advantageous in maintaining the display contrast of the display panel using the liquid crystal composition while effectively shortening the response time of the display panel. Simultaneously, to shorten the response time of the display panel, the thickness of the liquid crystal layer in the display panel is usually reduced accordingly. However, reducing the thickness of the liquid crystal layer in the display panel leads to a decrease in the light transmittance of the display panel. The combination of the first compound, the second compound represented by general formula (II-2), and the third compound represented by general formula (III-3) can effectively increase the absolute value of the difference in birefringence of the liquid crystal composition, thereby complementing the thickness of the liquid crystal layer in the display panel and effectively compensating for the decrease in light transmittance of the display panel caused by the reduction in the thickness of the liquid crystal layer.

[0096] The liquid crystal composition provided in this application can control the absolute value of the difference in birefringence of the liquid crystal composition by combining different first compounds, second compounds and third compounds, thereby matching different layer thicknesses of liquid crystal layers suitable for various display panels and meeting diverse application scenarios of display panels.

[0097] In some embodiments, the difference in birefringence of the liquid crystal composition at 25°C is greater than or equal to 0.09, and the difference in birefringence of the liquid crystal composition at 25°C is less than or equal to 0.22, for example: 0.096, 0.1, 0.105, 0.11, 0.115, 0.12, 0.125, 0.15, 0.175, 0.2, 0.21, etc., so that the optical anisotropy of the liquid crystal composition is within a suitable range, and the light transmittance of the liquid crystal composition is matched with the thickness of the liquid crystal layer in the display panel, thereby making the light transmittance of the display panel within a suitable range.

[0098] In some embodiments, the rotational viscosity of the liquid crystal composition at 25°C is greater than or equal to 40 mPa·s, and the rotational viscosity of the liquid crystal composition at 25°C is less than or equal to 100 mPa·s, for example: 45 mPa·s, 50 mPa·s, 55 mPa·s, 60 mPa·s, 65 mPa·s, 70 mPa·s, 75 mPa·s, 80 mPa·s, 85 mPa·s, 90 mPa·s, 95 mPa·s, etc., so that the rotational viscosity of the liquid crystal composition is within a suitable range, thereby increasing the rotational speed of the liquid crystal composition and ensuring that the response time of the display panel using the liquid crystal composition is within a suitable range.

[0099] In some embodiments, the flexural elasticity coefficient of the liquid crystal composition is greater than or equal to 10, and the flexural elasticity coefficient of the liquid crystal composition is less than or equal to 26, for example: 11, 12, 13, 14, 15, 18, 20, 22, 24, 25, etc.; and / or, the flexural elasticity coefficient of the liquid crystal composition is greater than or equal to 10, and the flexural elasticity coefficient of the liquid crystal composition is less than or equal to 26, for example: 12, 13, 14, 15, 18, 20, 22, 24, 25, etc.; the flexural elasticity coefficient and / or the flexural elasticity coefficient of the liquid crystal composition being within the above ranges is beneficial for the liquid crystal composition to obtain a suitable average value of elasticity coefficient, effectively improving the response speed of the display panel when the liquid crystal composition is applied to the display surface, thereby obtaining a faster response time.

[0100] In some embodiments, the dielectric constant anisotropy value of the liquid crystal composition at 25°C is less than 0, and the dielectric constant anisotropy value of the liquid crystal composition at 25°C is greater than or equal to -5, for example: -4.8, -4.5, -4, -3.5, -3, -2, -1, etc., which is beneficial to reduce the driving voltage required to drive the liquid crystal composition, thereby reducing the driving voltage of the liquid crystal display panel using the liquid crystal composition and reducing the power consumption of the liquid crystal display panel using the liquid crystal composition.

[0101] In some embodiments, the clearing point of the liquid crystal composition is preferably between 70°C and 135°C. For example, the clearing point of the liquid crystal composition can be 75°C, 77°C, 78°C, 80°C, 82°C, 84°C, 88°C, 90°C, 92°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, etc., to avoid the liquid crystal composition's high-temperature resistance being reduced due to an excessively low clearing point.

[0102] Please see Figure 1 An exemplary method for preparing the liquid crystal composition provided by the present invention is as follows:

[0103] The method for preparing the liquid crystal composition includes:

[0104] S100: Weigh and mix the first compound, the second compound, and the third compound in a first order by mass percentage to obtain a first mixture.

[0105] The preferred order is that the first compound, the second compound, and the third compound are weighed and mixed in order of increasing melting point.

[0106] In some embodiments, when the liquid crystal composition further includes the fourth compound and / or the fifth compound, the first mixture further includes the fourth compound and / or the fifth compound.

[0107] S200: Stir the first mixture at a first heating temperature to ensure that the first compound, the second compound, and the third compound in the first mixture are fully mixed.

[0108] The first heating temperature is preferably 60°C to 100°C.

[0109] S300: Cool the first mixture to room temperature and encapsulate it to obtain the liquid crystal composition.

[0110] Exemplary configurations of the liquid crystal composition of the present invention are shown in Exemplary Embodiments 1 to 3 below.

[0111] Example 1

[0112] The structural formulas and mass fractions of each compound in the liquid crystal composition selected in this embodiment are shown in Table 1:

[0113] Table 1: Components of the Liquid Crystal Composition

[0114]

[0115]

[0116] The liquid crystal composition obtained in Example 1 has the following performance parameters: Tni: 96℃, γ1: 67 mPa·s, Δn: 0.096, ne: 1.473, Δε: -2.5, ε ⊥ 5.3, K 11 16.6, K 33 :17.0, no crystals precipitated after the liquid crystal composition was placed at -20℃ for 480 h. Wherein, Tni represents the clearing point of the liquid crystal composition; γ1 represents the rotational viscosity of the liquid crystal composition at 25℃; Δn is the difference in birefringence of the liquid crystal composition, representing the optical anisotropy of the liquid crystal composition at 25℃; ne represents the refractive index of the liquid crystal composition for unusual light; Δε represents the dielectric constant anisotropy value of the liquid crystal composition at 25℃; ε ⊥ K represents the dielectric constant of the liquid crystal composition in the direction perpendicular to the long axis of the liquid crystal molecules. 11 K represents the flexural elasticity coefficient of the liquid crystal composition. 33 This represents the stretch elastic coefficient of the liquid crystal composition.

[0117] Example 2

[0118] The structural formulas and mass fractions of each compound in the liquid crystal composition selected in this embodiment are shown in Table 2:

[0119] Table 2: Components of the Liquid Crystal Composition

[0120]

[0121]

[0122] The liquid crystal composition obtained in Example 2 has the following performance parameters: Tni: 89℃, γ1: 77.5 mPa·s, Δn: 0.103, ne: 1.502, Δε: -3.6, ε ⊥ 7.0, K 11 15.6, K 33 :18.2, No crystals precipitated after the liquid crystal composition was placed at -20°C for 480 hours.

[0123] Example 3

[0124] The structural formulas and mass fractions of each compound in the liquid crystal composition selected in this embodiment are shown in Table 3:

[0125] Table 3: Components of the Liquid Crystal Composition

[0126]

[0127]

[0128] The liquid crystal composition obtained in Example 3 has the following performance parameters: Tni: 112℃, γ1: 97 mPa·s, Δn: 0.108, ne: 1.574, Δε: -2.7, ε ⊥ 5.8, K 11 19.9, K 33 :25.7, no crystals precipitated after the liquid crystal composition was placed at -20°C for 480 hours.

[0129] Comparative Example 1

[0130] The structural formulas and mass fractions of each compound in the liquid crystal composition selected in this comparative example are shown in Table 4:

[0131] Table 4: Components of the Liquid Crystal Composition

[0132]

[0133]

[0134] The liquid crystal composition obtained in Comparative Example 1 has the following performance parameters: Tni: 114℃, γ1: 83 mPa·s, Δn: 0.097, ne: 1.477, Δε: -2.6, ε ⊥ 5.2, K 11 18.8, K 33 :19.3, No crystals precipitated after the liquid crystal composition was placed at -20°C for 480 hours.

[0135] Comparative Example 2

[0136] The structural formulas and mass fractions of each compound in the liquid crystal composition selected in this comparative example are shown in Table 5:

[0137] Table 5: Components of the Liquid Crystal Composition

[0138]

[0139]

[0140] The liquid crystal composition obtained in Comparative Example 2 has the following performance parameters: Tni: 87℃, γ1: 82 mPa·s, Δn: 0.118, ne: 1.632, Δε: -4.4, ε ⊥ 8.5, K 11 14.9, K 33 :15.5, no crystals precipitated after the liquid crystal composition was placed at -20°C for 480 hours.

[0141] The three liquid crystal compositions provided in Examples 1 to 3 above all have a clearing point between 89°C and 112°C, giving them good high-temperature resistance; their rotational viscosity at 25°C is between 67 mPa·s and 97 mPa·s, giving them good rotational speed, which is beneficial for shortening the response time of the liquid crystal composition; the difference in birefringence at 25°C is between 0.096 and 0.108, ensuring that the display panel has suitable light transmittance when the liquid crystal composition is applied; the anisotropy of the dielectric constant at 25°C is between -3.6 and -2.5, which is beneficial for driving the liquid crystal composition at a lower driving voltage, thereby reducing the power consumption of the display panel using the liquid crystal composition; the flexural elastic modulus of the liquid crystal composition is between 15.6 and 19.9, and the stretch elastic modulus is between 17 and 25.7, which is beneficial for improving the average value of the elastic modulus of the liquid crystal composition and effectively shortening the response time of the display panel when the liquid crystal composition is applied to the display surface.

[0142] Compared with Comparative Example 1, Example 1 incorporates a second compound represented by general formula (II-1) into the liquid crystal composition, resulting in the liquid crystal composition of Example 1 having at least one second compound selected from the structure shown in general formula (II-1), at least one third compound selected from the structure shown in general formula (III-1), and at least one third compound selected from the structure shown in (III-2). This effectively reduces the viscosity of the liquid crystal composition in Example 1 and lowers the viscosity-to-flexural elasticity ratio, thereby more effectively improving the response speed of the liquid crystal composition and improving the response time of the display panel when the liquid crystal composition is applied to the display panel.

[0143] Compared with Comparative Example 2, Example 2 incorporates more of the first compound represented by general formula (Ⅰ) into the liquid crystal composition, resulting in a mass fraction of 30% for the first compound in the liquid crystal composition. This effectively reduces the ratio of viscosity to flexural elasticity of the liquid crystal composition in Example 2, thereby more effectively improving the response speed of the liquid crystal composition and enhancing the response time of the display panel when the liquid crystal composition is applied to the display panel.

[0144] Please see Figure 2This invention also provides a display panel 100, which includes a first substrate 101, a second substrate 102 located on the first substrate 101, and a liquid crystal layer 103 located between the first substrate 101 and the second substrate 102. The liquid crystal layer 103 includes the liquid crystal composition described above.

[0145] The first substrate 101 may be an array substrate, and the second substrate 102 may be a color filter substrate. In some embodiments, when the first substrate 101 is an array substrate, the first substrate 101 includes a first substrate, an active layer on the substrate, a first insulating layer on the active layer, a gate layer on the first insulating layer, a second insulating layer on the gate layer, a source-drain layer on the second insulating layer, and a third insulating layer on the source-drain layer, wherein the source-drain layer includes a source and a drain. The display panel further includes a common electrode layer and a pixel electrode layer, wherein the pixel electrode layer is located on the side of the third insulating layer away from the first substrate, and the pixel electrode layer includes a pixel electrode, which is electrically connected to the source or the drain. The common electrode layer includes a common electrode, which may be disposed on the first substrate 101, located between the pixel electrode layer and the source / drain layer, or located on the side of the pixel electrode layer away from the first substrate; the common electrode layer may also be disposed on the second substrate 102, which includes a second substrate, with the common electrode layer located on the side of the second substrate closer to the liquid crystal layer. The display panel further includes a color filter layer, which may be disposed on the side of the first substrate closer to the liquid crystal layer or on the side of the second substrate closer to the liquid crystal layer.

[0146] In some embodiments, the color filter layer includes a first color filter, a second color filter, and a third color filter, each of which has a different color. The first, second, and third color filters are selected from red, green, and blue color filters, respectively. The red color filter includes pigments such as diketopyrrole and diketopyrrole, and the mass fraction of water-soluble pigment in the red color filter is less than or equal to 1.5%. 90% of the pigment in the red color filter has a particle size less than or equal to 100 nanometers, which facilitates pigment dispersion within the red color filter, thereby improving the transmittance and color gamut of the red color filter. The green color filter may include a mixture of phthalocyanine blue dyes and azo yellow organic dyes, copper halide phthalocyanine green pigments, or other phthalocyanine green pigments, etc. The mass fraction of water-soluble pigment in the green color filter is less than or equal to 1.5%, and 90% of the pigment in the green color filter has a particle size less than or equal to 100 nanometers, which facilitates pigment dispersion within the green color filter, thereby improving the transmittance and color gamut of the green color filter. Blue color resists may include ε-type copper phthalocyanine blue pigment, and the mass fraction of water-soluble pigments in the blue color resist is less than or equal to 1.5%. 90% of the pigments in the blue color resist have a particle size of less than or equal to 100 nanometers, which is beneficial for the dispersion of pigments in the blue color resist, thereby improving the transmittance and color gamut of the blue color resist.

[0147] In some embodiments, the display panel 100 further includes a first alignment layer located between the first substrate 101 and the liquid crystal layer 103, and a second alignment layer located between the second substrate 102 and the liquid crystal layer 103. The first alignment layer and / or the second alignment layer comprises a polymer derived from polyimide or other polyamic acid.

[0148] The display panel 100 can be a display panel with display modes such as VA (Vertical Alignment), ECB (Electrically Controlled Birefringence), FFS (Fringe Field Switching), or IPS (In-Ilane Iwitching).

[0149] The present invention improves the performance of liquid crystal compositions in terms of viscosity, optical anisotropy, and elastic modulus by including a first compound, a second compound, and a third compound in the liquid crystal composition, thereby improving the product quality of display panels using the liquid crystal composition.

[0150] This invention discloses a liquid crystal composition and a display panel. The liquid crystal composition includes at least one first compound, at least one second compound, and at least one third compound. The first compound has a structure as shown in general formula (I), the second compound has a structure as shown in general formula (II-1) or general formula (II-2), and the third compound has a structure as shown in any one of general formulas (III-1) to (III-3). By including the first compound, the second compound, and the third compound in the liquid crystal composition, this invention improves the performance of the liquid crystal composition in terms of viscosity, optical anisotropy, and elastic modulus, thereby improving the product quality of the display panel using the liquid crystal composition.

[0151] The liquid crystal composition and display panel provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A liquid crystal composition, characterized by comprising The liquid crystal composition is composed of at least one first compound, at least one second compound, at least one third compound, and at least one fifth compound; The first compound has a structure as shown in general formula (I): (Ⅰ) The second compound has a structure as shown in general formula (II-1): (Ⅱ-1) The third compound has structures as shown in general formula (III-1) and general formula (III-2): (Ⅲ-1) (Ⅲ-2) The fifth compound has a structure as shown in general formula (V): (Ⅴ) wherein R1 and R2 are independently selected from alkyl with 1-15 carbon atoms, alkoxy with 1-15 carbon atoms, alkenyl with 2-15 carbon atoms, alkenyloxy with 2-15 carbon atoms; R5 and R6 are independently selected from alkyl with 1-10 carbon atoms, alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, alkenyloxy with 2-10 carbon atoms; The mass fraction of the first compound in the liquid crystal composition is greater than or equal to 20% and less than or equal to 50%, the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 5% and less than or equal to 30%, the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 5% and less than or equal to 40%, and the mass fraction of the fifth compound in the liquid crystal composition is greater than or equal to 1% and less than or equal to 25%.

2. A display panel, characterized by, The liquid crystal display device comprises a first substrate, a second substrate located on the first substrate, and a liquid crystal layer located between the first substrate and the second substrate; The liquid crystal layer comprises the liquid crystal composition according to claim 1.

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