Liquid crystal composition and display panel

Abstract

The embodiment of the present application discloses a liquid crystal composition and a display panel, the liquid crystal composition comprises at least one first compound represented by a general formula (I), and the present application improves the performance of the liquid crystal composition in the clearing point, optical anisotropy, elastic coefficient and the like by adding the first compound in the liquid crystal composition, so that the display contrast and the response time of the display panel using the liquid crystal composition are improved.

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 display performance of the LCD panel in aspects such as contrast ratio and response time. Currently, the performance of materials used in the liquid crystal layer still needs improvement, making it difficult to enhance aspects like contrast ratio and response time in 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] This invention provides a liquid crystal composition and a display panel, which can alleviate the technical problem that the display contrast and response time of the display panel are difficult to improve due to the need to improve the material properties in the liquid crystal layer.

[0005] This invention provides a liquid crystal composition comprising at least one first compound represented by general formula (I):

[0006]

[0007] Where m and n are independently selected from 0, 1, 2, and 3 respectively, and the sum of m and n is greater than or equal to 1;

[0008] Each time it appears, it is selected independently. Each time it appears, it is selected independently.

[0009] as well as The H atoms in the sample are either not substituted or at least one H atom is substituted by any one of F, Cl, Br, or I atoms.

[0010] L is selected from H, F, CF3, OCF3, Cl, Br, I, CN, CH3;

[0011] Z1, Z2are each independently at each occurrence selected from the group consisting of a single bond, -0-, -C(0)0-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CF2CF2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, substituted or unsubstituted alkyl having 1-7 carbon atoms, substituted or unsubstituted alkyl ether having 1-7 carbon atoms, substituted or unsubstituted alkenyl having 2-7 carbon atoms, substituted or unsubstituted alkenyl ether having 2-7 carbon atoms, substituted or unsubstituted alkynyl having 2-7 carbon atoms, substituted or unsubstituted alkynyl ether having 2-7 carbon atoms, when any Z1and / or any Z2is selected from a group having H, the H in any Z1and / or any Z2is unsubstituted or at least one H is substituted by any one of F, Cl, Br, I;

[0012] R1and R2are each independently selected from the group consisting of H, F, Cl, Br, I, CN, SCN, NCS, SF5, CF3, OCF3, substituted or unsubstituted alkyl having 1-15 carbon atoms, substituted or unsubstituted alkoxy having 1-15 carbon atoms, substituted or unsubstituted alkenyl having 2-15 carbon atoms, substituted or unsubstituted alkenyloxy having 2-15 carbon atoms, substituted or unsubstituted alkynyl having 2-15 carbon atoms, substituted or unsubstituted alkynyloxy having 2-15 carbon atoms.

[0013] Preferably, the terminal groups of R1and R2are each independently monosubstituted by H, CN or CF3; and / or,

[0014] one or more -CH2- in R1and R2are each independently substituted by -0-, -S-, -SO2-, -CO-, -C(0)0-, -OC(O)-, -OC(0)0-, -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 no direct bond between the heteroatoms directly bonded to C, and the H in R1and R2are unsubstituted or at least one H is substituted by any one of F, Cl, Br, I.

[0015] Preferably, the first compound has a structure as represented in at least one of the general formulae I-1 to I-78:

[0016]

[0017]

[0018]

[0019]

[0020] Preferably, the first compound has a structure according to at least one of the general formulae IA-1 to IA-156:

[0021]

[0022]

[0023]

[0024]

[0025]

[0026] Preferably, R1and R2are each independently selected from the group consisting of H, F, non-substituted alkyl having 1 to 7 carbon atoms, non-substituted alkoxy having 1 to 7 carbon atoms, non-substituted alkenyl having 2 to 7 carbon atoms.

[0027] Preferably, L is selected from the group consisting of H, F, CI, CN, CH3;

[0028] Z1, Z2are each independently at each occurrence selected from the group consisting of -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, non-substituted alkyl having 1 to 7 carbon atoms, non-substituted alkoxy having 2 to 7 carbon atoms, non-substituted alkenyl having 2 to 7 carbon atoms.

[0029] Preferably, the liquid crystal composition further comprises at least one second compound, the second compound having a structure according to at least one of the general formulae II-1 to II-7:

[0030]

[0031] wherein R3and R4are each independently selected from the group consisting of H, F, CF3, OCF3, substituted or non-substituted alkyl having 1 to 10 carbon atoms, substituted or non-substituted alkoxy having 1 to 10 carbon atoms, substituted or non-substituted alkenyl having 2 to 10 carbon atoms, substituted or non-substituted alkenyloxy having 2 to 10 carbon atoms, substituted or non-substituted alkynyl having 2 to 10 carbon atoms, substituted or non-substituted alkynyloxy having 2 to 10 carbon atoms, when R3and / or R4are selected from the group consisting of H, the H in R3and / or R4is not substituted, or at least one H is substituted by any one of F, CI, Br, I.

[0032] Preferably, the liquid crystal composition further comprises at least one third compound having a structure as shown in at least one of general formula III-1 to III-19:

[0033]

[0034] wherein R5 and R6 are independently selected from H, F, CF3, OCF3, substituted or unsubstituted alkyl having 1-10 carbon atoms, substituted or unsubstituted alkoxy having 1-10 carbon atoms, substituted or unsubstituted alkenyl having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy having 2-10 carbon atoms, substituted or unsubstituted alkynyl having 2-10 carbon atoms, substituted or unsubstituted alkynyloxy having 2-10 carbon atoms, and when R5 and / or R6 is selected from a group having H, the H in R5 and / or R6 is unsubstituted or at least one H is substituted by any one of F, Cl, Br, I.

[0035] Preferably, in the liquid crystal composition, the mass fraction of the first compound is greater than or equal to 1%, and the mass fraction of the first compound is less than or equal to 70%.

[0036] In the liquid crystal composition, the mass fraction of the second compound is greater than or equal to 10%, and the mass fraction of the second compound is less than or equal to 85%.

[0037] In the liquid crystal composition, the mass fraction of the third compound is greater than or equal to 10%, and the mass fraction of the third compound is less than or equal to 70%.

[0038] The application further 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.

[0039] The liquid crystal layer comprises the liquid crystal composition as described above.

[0040] The application improves the performance of the liquid crystal composition in terms of clearing point, optical anisotropy, elastic coefficient, etc. by adding the first compound in the liquid crystal composition, thereby improving the display contrast and response time of the display panel using the liquid crystal composition. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0042] Figure 1 is a flow chart of a preparation method of a liquid crystal composition provided by an embodiment of the present application;

[0043] Figure 2 is a structural schematic diagram of a display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as “upper” and “lower” generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawings; and “inner” and “outer” refer to the outline of the device.

[0045] At present, due to the performance of the material of the liquid crystal layer to be improved, there is a problem that the display contrast and response time of the liquid crystal display panel are difficult to improve.

[0046] The embodiments of the present application provide a liquid crystal composition, which comprises at least one first compound represented by a general formula (I):

[0047]

[0048] wherein m and n are independently selected from 0, 1, 2 and 3, and the sum of m and n is greater than or equal to 1;

[0049] is independently selected from the following groups at each occurrence: is independently selected from the following groups at each occurrence:

[0050] and H in the above groups is unsubstituted or at least one H is substituted by any one of F, Cl, Br and I; L is selected from H, F, CF3, OCF3, Cl, Br, I, CN and CH3;

[0051]

[0052] ​Z1, Z2are each independently selected from a single bond, -O-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CF2CF2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, substituted or unsubstituted alkyl having 1-7 carbon atoms, substituted or unsubstituted alkyl ether having 1-7 carbon atoms, substituted or unsubstituted alkenyl having 2-7 carbon atoms, substituted or unsubstituted alkenyl ether having 2-7 carbon atoms, substituted or unsubstituted alkynyl having 2-7 carbon atoms, substituted or unsubstituted alkynyl ether having 2-7 carbon atoms, when any Z1and / or any Z2is selected from a group having H, the H in any Z1and / or any Z2is unsubstituted or at least one H is substituted by any of F, Cl, Br, I;

[0053] R1and R2are each independently selected from H, F, Cl, Br, I, CN, SCN, NCS, SF5, CF3, OCF3, substituted or unsubstituted alkyl having 1-15 carbon atoms, substituted or unsubstituted alkoxy having 1-15 carbon atoms, substituted or unsubstituted alkenyl having 2-15 carbon atoms, substituted or unsubstituted alkenyloxy having 2-15 carbon atoms, substituted or unsubstituted alkynyl having 2-15 carbon atoms, substituted or unsubstituted alkynyloxy having 2-15 carbon atoms.

[0054] The first compound is a positive dielectric anisotropic compound, and the addition of the first compound is beneficial to increase the clearing point, the average value of the elastic coefficient, and the absolute value of the difference of the birefringence of the liquid crystal composition, effectively improve the dark state light leakage problem of the display panel and improve the response speed when the liquid crystal composition is applied to the display panel, thereby increasing the display contrast of the display panel and reducing the response time when the liquid crystal composition is applied to the display panel.

[0055] The embodiment of the present application improves the display contrast and the response time of the display panel by adding the first compound to the liquid crystal composition to improve the performance of the liquid crystal composition in terms of the clearing point, optical anisotropy, and elastic coefficient.

[0056] In the embodiment, In each optional group of the present application, “-” represents a connection site.

[0057] In some embodiments, the terminal groups of R1and R2are each independently monosubstituted by H, CN, or CF3.

[0058] In some embodiments, one or more -CH2- in R1and R2is independently replaced with -0-, -S-, -S02-, -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 no direct bond between the heteroatoms directly bonded to C, and the H in R1and R2is unsubstituted or at least one H is substituted with any one of F, Cl, Br, I.

[0059] In some embodiments, R1and R2are independently selected from H, F, Cl, Br, substituted or unsubstituted alkyl having 1-7 carbon atoms, substituted or unsubstituted alkoxy having 1-7 carbon atoms, substituted or unsubstituted alkenyl having 2-7 carbon atoms, substituted or unsubstituted alkenyloxy having 2-7 carbon atoms, substituted or unsubstituted alkynyl having 2-7 carbon atoms, substituted or unsubstituted alkynyloxy having 2-7 carbon atoms. When R1and / or R2is selected from substituted alkyl, substituted alkoxy, substituted alkenyl, substituted alkenyloxy, substituted alkynyl, substituted alkynyloxy, at least one H in R1and / or R2is substituted with any one of F, Cl, Br, I.

[0060] Preferably, R1and R2are independently selected from H, F, unsubstituted alkyl having 1-7 carbon atoms, unsubstituted alkoxy having 1-7 carbon atoms, unsubstituted alkenyl having 2-7 carbon atoms, unsubstituted alkenyloxy having 2-7 carbon atoms, unsubstituted alkynyl having 2-7 carbon atoms, unsubstituted alkynyloxy having 2-7 carbon atoms.

[0061] More preferably, R1and R2are independently selected from H, F, unsubstituted alkyl having 1-5 carbon atoms, unsubstituted alkoxy having 1-5 carbon atoms, unsubstituted alkenyl having 2-5 carbon atoms.

[0062] In some embodiments, when R1and R2are independently selected from unsubstituted alkyl, unsubstituted alkenyl, or unsubstituted alkynyl, the unsubstituted alkyl, unsubstituted alkenyl, and unsubstituted alkynyl are aliphatic hydrocarbon groups.

[0063] In some embodiments, when R1and R2are each independently selected from unsubstituted alkyl, the unsubstituted alkyl can be unsubstituted straight chain alkyl or unsubstituted branched chain alkyl, preferably unsubstituted straight chain alkyl; R1and R2are each independently selected from unsubstituted straight chain alkyl having 1 to 7 carbon atoms, which can be selected from, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0064] When R1and R2are each independently selected from unsubstituted alkenyl, the unsubstituted alkenyl can be unsubstituted straight chain alkenyl or unsubstituted branched chain alkenyl, and the alkenyl can be isomers of E configuration and Z configuration, and have at least one carbon-carbon double bond, which can be selected from, for example, unsubstituted straight chain alkenyl having 2-7 carbon atoms, more preferably ethenyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, hept-1-enyl, hept-2-enyl, hept-3-enyl, hept-4-enyl, hept-5-enyl, hept-6-enyl, and the like.

[0065] When R1and R2are each independently selected from unsubstituted alkynyl, the unsubstituted alkynyl can be unsubstituted straight chain alkynyl or unsubstituted branched chain alkynyl, and have at least one carbon-carbon triple bond, which can be selected from, for example, unsubstituted straight chain alkynyl having 2-7 carbon atoms, more preferably ethynyl, prop-1-ynyl, prop-2-ynyl, but-1-ynyl, but-2-ynyl, but-3-ynyl, pent-1-ynyl, pent-2-ynyl, pent-3-ynyl, pent-4-ynyl, hex-1-ynyl, hex-2-ynyl, hex-3-ynyl, hex-4-ynyl, hex-5-ynyl, hept-1-ynyl, hept-2-ynyl, hept-3-ynyl, hept-4-ynyl, hept-5-ynyl, hept-6-ynyl, and the like; further preferably prop-2-ynyl, but-2-ynyl, but-3-ynyl, pent-2-ynyl, pent-3-ynyl, or pent-4-ynyl.

[0066] In some embodiments, the sum of m and n is greater than or equal to 1 and less than or equal to 4, which is conducive to increasing the number of rigid rings and / or conjugated rings in the first compound, thereby increasing the clearing point, the average value of the elastic coefficient, and the absolute value of the difference of the birefringence of the liquid crystal composition, and further effectively improving the problem of dark state light leakage and the response speed of the display panel when the liquid crystal composition is applied to the display surface, thereby increasing the display contrast of the display panel and shortening the response time when the liquid crystal composition is applied to the display surface. When n is 0, the first compound can be represented as

[0067] In some embodiments, L is selected from H, F, Cl, CN, CH3.

[0068] In some embodiments, each occurrence of Z1, Z2is independently selected from the group consisting of -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, unsubstituted alkyl having 1 to 7 carbon atoms, unsubstituted alkoxy having 2 to 7 carbon atoms, unsubstituted alkenyl having 2 to 7 carbon atoms.

[0069] When Z1and Z2are each independently selected from unsubstituted alkyl, the unsubstituted alkyl can be unsubstituted straight chain alkyl or unsubstituted branched chain alkyl, preferably unsubstituted straight chain alkyl; when Z1and Z2are each independently selected from unsubstituted straight chain alkyl having 1 to 7 carbon atoms, they can be selected from, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0070] When Z1and Z2are each independently selected from unsubstituted alkenyl, the unsubstituted alkenyl can be unsubstituted straight chain alkenyl or unsubstituted branched chain alkenyl, and the alkenyl can be in the E configuration as well as the Z configuration isomers, and have at least one carbon-carbon double bond, and can be selected from, for example, unsubstituted straight chain alkenyl having 2 to 7 carbon atoms, more preferably vinyl, prop-1- enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, hept-1-enyl, hept-2-enyl, hept-3-enyl, hept-4-enyl, hept-5-enyl, hept-6-enyl, and the like.

[0071] Preferably, each occurrence of Z1, Z2is independently selected from the group consisting of -CF2O-, -CH2CH2-, -CH2O-.

[0072] In some embodiments, the first compound has a structure according to at least one of the general formulae I-1 to I-78:

[0073]

[0074]

[0075]

[0076]

[0077] Preferably, each occurrence is independently selected from the group consisting of

[0078] In some embodiments, the first compound has a structure according to at least one of Formulae IA-1 to IA-67:

[0079]

[0080]

[0081]

[0082]

[0083] In some embodiments, the liquid crystal composition further comprises at least one second compound having a structure according to at least one of Formulae II-1 to II-7:

[0084]

[0085] wherein R3and R4are each independently selected from substituted or unsubstituted alkyl having 1-10 carbon atoms, substituted or unsubstituted alkoxy having 1-10 carbon atoms, substituted or unsubstituted alkenyl having 2-10 carbon atoms, substituted or unsubstituted alkenyloxy having 2-10 carbon atoms, substituted or unsubstituted alkynyl having 2-10 carbon atoms, substituted or unsubstituted alkynyloxy having 2-10 carbon atoms, when R3and / or R4is selected from a group having H, the H in R3and / or R4is unsubstituted, or at least one H is substituted by any one of F, Cl, Br, I, H. When R3and / or R4is selected from substituted alkyl, substituted alkoxy, substituted alkenyl, substituted alkenyloxy, substituted alkynyl or substituted alkynyloxy, at least one H in R3and / or R4is substituted by any one of F, Cl, Br, I.

[0086] The second compound is a dielectric neutral compound, which is used to adjust the viscosity, clearing point, dielectric anisotropy, optical anisotropy, elastic coefficient, etc. of the liquid crystal composition, so that the liquid crystal composition is suitable for use in a display panel.

[0087] In some embodiments, R3and R4are each independently selected from substituted or unsubstituted alkyl having 1-7 carbon atoms, substituted or unsubstituted alkoxy having 1-7 carbon atoms, substituted or unsubstituted alkenyl having 2-7 carbon atoms. Preferably, R3and R4are each independently selected from unsubstituted alkyl having 1-7 carbon atoms, unsubstituted alkoxy having 1-7 carbon atoms, unsubstituted alkenyl having 2-7 carbon atoms.

[0088] More preferably, R3and R4are each independently selected from unsubstituted alkyl having 1-5 carbon atoms, unsubstituted alkoxy having 1-5 carbon atoms, unsubstituted alkenyl having 2-5 carbon atoms.

[0089] In some embodiments, when R3and R4are each independently selected from unsubstituted alkyl, the unsubstituted alkyl can be unsubstituted straight chain alkyl or unsubstituted branched chain alkyl, preferably unsubstituted straight chain alkyl; R3and R4are each independently selected from unsubstituted straight chain alkyl having 1 to 7 carbon atoms, which can be selected from, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0090] When R3and R4are each independently selected from unsubstituted alkenyl, the unsubstituted alkenyl can be unsubstituted straight chain alkenyl or unsubstituted branched chain alkenyl, and the alkenyl can be an isomer of E configuration and Z configuration, and has at least one carbon-carbon double bond, which can be selected from, for example, unsubstituted straight chain alkenyl having 2 to 7 carbon atoms, more preferably ethenyl, prop-1-enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, hept-1-enyl, hept-2-enyl, hept-3-enyl, hept-4-enyl, hept-5-enyl, hept-6-enyl, and the like.

[0091] In some embodiments, the liquid crystal composition further comprises at least one third compound having a structure as represented by at least one of general formulas III-1 to III-19:

[0092]

[0093] wherein R5and R6are each independently selected from substituted or unsubstituted alkyl having 1 to 10 carbon atoms, substituted or unsubstituted alkoxy having 1 to 10 carbon atoms, substituted or unsubstituted alkenyl having 2 to 10 carbon atoms, substituted or unsubstituted alkenyloxy having 2 to 10 carbon atoms, substituted or unsubstituted alkynyl having 2 to 10 carbon atoms, substituted or unsubstituted alkynyloxy having 2 to 10 carbon atoms, R5and / or R6are selected from a group having H, wherein the H in R5and / or R6is unsubstituted or at least one H is substituted by any one of F, Cl, Br, I.

[0094] The third compound is a positive dielectric anisotropic compound, so that the liquid crystal composition is mixed with the positive dielectric anisotropic compound and the dielectric neutral compound in a certain proportion, and the viscosity, clearing point, dielectric anisotropy, optical anisotropy, elastic coefficient, and the like of the liquid crystal composition are comprehensively adjusted, so that the liquid crystal composition is suitable for use in a display panel.

[0095] In some embodiments, R5and R6are each independently selected from substituted or unsubstituted alkyl having 1 to 7 carbon atoms, substituted or unsubstituted alkoxy having 1 to 7 carbon atoms, substituted or unsubstituted alkenyl having 2 to 7 carbon atoms. Preferably, R5and R6are each independently selected from unsubstituted alkyl having 1 to 7 carbon atoms, unsubstituted alkoxy having 1 to 7 carbon atoms, unsubstituted alkenyl having 2 to 7 carbon atoms.

[0096] More preferably, R5and R6are each independently selected from unsubstituted alkyl having 1 to 5 carbon atoms, unsubstituted alkoxy having 1 to 5 carbon atoms, unsubstituted alkenyl having 2 to 5 carbon atoms.

[0097] In some embodiments, when R5and R6are each independently selected from unsubstituted alkyl, the unsubstituted alkyl can be unsubstituted straight chain alkyl or unsubstituted branched chain alkyl, preferably unsubstituted straight chain alkyl; and when R5and R6are each independently selected from unsubstituted straight chain alkyl having 1 to 7 carbon atoms, they can be selected from, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

[0098] When R5and R6are each independently selected from unsubstituted alkenyl, the unsubstituted alkenyl can be unsubstituted straight chain alkenyl or unsubstituted branched chain alkenyl, and the alkenyl can be an isomer of E configuration and Z configuration, and have at least one carbon-carbon double bond, and can be selected from, for example, unsubstituted straight chain alkenyl having 2 to 7 carbon atoms, more preferably vinyl, prop-1- enyl, prop-2-enyl, but-1-enyl, but-2-enyl, but-3-enyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, hex-5-enyl, hept-1-enyl, hept-2-enyl, hept-3-enyl, hept-4-enyl, hept-5-enyl, hept-6-enyl, and the like.

[0099] In some embodiments, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, the mass fraction of the first compound in the liquid crystal composition is less than or equal to 70%, for example, the mass fraction of the first compound can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc.; the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the second compound in the liquid crystal composition is less than or equal to 85%, for example, the mass fraction of the second compound can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc.; the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the third compound in the liquid crystal composition is less than or equal to 70%, for example, the mass fraction of the third compound can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc.

[0100] Preferably, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, the mass fraction of the first compound in the liquid crystal composition is less than or equal to 50%, for example, the mass fraction of the first compound can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, etc.; the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the second compound in the liquid crystal composition is less than or equal to 80%, for example, the mass fraction of the second compound can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 55%, 60%, 65%, 70%, 75%, etc.; the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the third compound in the liquid crystal composition is less than or equal to 50%, for example, the mass fraction of the third compound can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, etc.

[0101] More preferably, the mass fraction of the first compound in the liquid crystal composition is greater than or equal to 1%, the mass fraction of the first compound in the liquid crystal composition is less than or equal to 40%, for example, the mass fraction of the first compound can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, etc.; the mass fraction of the second compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the second compound in the liquid crystal composition is less than or equal to 70%, for example, the mass fraction of the second compound can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 55%, 60%, 65%, etc.; the mass fraction of the third compound in the liquid crystal composition is greater than or equal to 10%, the mass fraction of the third compound in the liquid crystal composition is less than or equal to 50%, for example, the mass fraction of the third compound can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, etc.

[0102] In some embodiments, the absolute value of the difference in birefringence of the liquid crystal composition at 25°C is greater than or equal to 0.09, the absolute value of the difference in birefringence of the liquid crystal composition at 25°C is less than or equal to 0.22, for example: 0.1, 0.105, 0.11, 0.115, 0.12, 0.125, 0.15, 0.175, 0.2, 0.21, etc., so that the absolute value of the difference in birefringence of the liquid crystal composition is within a suitable range, ensuring that the light transmittance of the liquid crystal composition is within a suitable range, and the thickness of the liquid crystal layer in the display panel using the liquid crystal composition is suitable, so that the display panel using the liquid crystal composition has a suitable light transmittance.

[0103] In some embodiments, the rotational viscosity of the liquid crystal composition at 25°C is greater than or equal to 40 mPa·s, 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, increasing the rotational speed of the liquid crystal composition, ensuring that the response time of the liquid crystal composition is within a suitable range, and avoiding the influence of the rotational viscosity of the liquid crystal composition on the performance of the liquid crystal composition.

[0104] In some embodiments, the splay elastic constant of the liquid crystal composition is greater than or equal to 10, the splay elastic constant 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 bend elastic constant of the liquid crystal composition is greater than or equal to 10, the bend elastic constant 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 splay elastic constant of the liquid crystal composition and / or the bend elastic constant of the liquid crystal composition within the above range is conducive to the liquid crystal composition obtaining a suitable average value of elastic constant, effectively improving the problem of light leakage in dark state of the display panel when the liquid crystal composition is applied to the display surface and improving the response speed to obtain faster response time.

[0105] In some embodiments, the dielectric anisotropy value of the liquid crystal composition at 25°C is greater than 0, the dielectric anisotropy value of the liquid crystal composition at 25°C is less than or equal to 10, for example: 1, 2, 3, 4, 5, 6, 7, 8, 9, etc., which is conducive to reducing the driving voltage required for driving the liquid crystal composition, thereby reducing the driving voltage of the liquid crystal display panel applying the liquid crystal composition and reducing the power consumption of the liquid crystal display panel applying the liquid crystal composition.

[0106] In some embodiments, the clearing point of the liquid crystal composition is preferably 70°C to 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., so as to avoid the reduction of high temperature resistance of the liquid crystal composition caused by too low clearing point of the liquid crystal composition.

[0107] Please refer to Figure 1 The present application provides an exemplary preparation method of the liquid crystal composition, as shown below:

[0108] The preparation method of the liquid crystal composition comprises:

[0109] S100, weighing and mixing the first compound, the second compound and the third compound in a first order according to mass percentage to obtain a first mixture.

[0110] The first order is preferably the first compound, the second compound and the third compound are weighed and mixed in the order of melting point from low to high.

[0111] S200, stirring the first mixture at a first heating temperature to fully mix the first compound, the second compound and the third compound in the first mixture.

[0112] The first heating temperature is preferably 60-100°C.

[0113] S300, cooling the first mixture to room temperature and packaging to obtain the liquid crystal composition.

[0114] The exemplary combination of the liquid crystal composition of the present application is shown in the following exemplary embodiments 1-5.

[0115] Embodiment 1

[0116] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 1:

[0117] Table 1: Components of the liquid crystal composition

[0118]

[0119]

[0120] The performance parameters of the liquid crystal composition obtained in Embodiment 1 are as follows: Tni: 80°C, γ 1: 49 mPa·s, Δn: 0.100, ne: 1.586, Δε: 4.6, ε ⊥ : 2.7, K 11 : 14.2, K 33 : 14.6, and no crystals were precipitated from the liquid crystal composition after being stored at -20°C for 480 h. Among them, Tni represents the clearing point of the liquid crystal composition; γ1 represents the rotational viscosity of the liquid crystal composition at 25°C; Δn represents the optical anisotropy of the liquid crystal composition at 25°C, which is the difference between the birefringence of the liquid crystal composition; ne represents the refractive index of the extraordinary light of the liquid crystal composition; Δε represents the dielectric anisotropy value of the liquid crystal composition at 25°C; ε ⊥ represents the dielectric constant value of the liquid crystal composition perpendicular to the long axis direction of the liquid crystal molecule; K 11 represents the bending elastic coefficient of the liquid crystal composition, K 33 represents the splay elastic coefficient of the liquid crystal composition.

[0121] Embodiment 2

[0122] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 2:

[0123] Table 2: Components of the liquid crystal composition

[0124]

[0125]

[0126]

[0127] The liquid crystal composition obtained in Example 2 has the following performance parameters: Tni: 81℃, γ1: 60mPa-s, Δn: 0.115, ne: 1.613, Δε: 7.8, ε∥: 3.1, K11: 13.5, K33: 14.8, and no crystals precipitate from the liquid crystal composition after it is stored at -20℃ for 480h. 1: 60mPa·s, Δn:0.115, ne:1.613, Δε:7.8, ε ⊥ :3.1, K 11 :13.5, K 33 :14.8, liquid crystal composition at -20℃ under 480h no crystal precipitate.

[0128] Example 3

[0129] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 3:

[0130] Table 3: Components of the liquid crystal composition

[0131]

[0132]

[0133] The liquid crystal composition obtained in Example 3 has the following performance parameters: Tni: 91℃, γ1: 77mPa-s, Δn: 0.122, ne: 1.692, Δε: 8.4, ε∥: 3.6, K11: 14.8, K33: 15.4, and no crystals precipitate from the liquid crystal composition after it is stored at -20℃ for 480h. ⊥ :3.6, K 11 :14.8, K 33 :15.4, liquid crystal composition at -20℃ under 480h no crystal precipitate.

[0134] Example 4

[0135] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 4:

[0136] Table 4: Components of the liquid crystal composition

[0137]

[0138]

[0139] The liquid crystal composition obtained in Example 4 has the following performance parameters: Tni: 78℃, γ1: 45mPa-s, Δn: 0.103, ne: 1.573, Δε: 3.5, ε∥: 2.1, K11: 13.9, K33: 14.5, and no crystals precipitate from the liquid crystal composition after it is stored at -20℃ for 480h. ⊥ :2.1, K 11 :13.9, K 33 :14.5, liquid crystal composition at -20℃ under 480h no crystal precipitate.

[0140] Example 5

[0141] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 5:

[0142] Table 5: Components of the liquid crystal composition

[0143]

[0144]

[0145] The liquid crystal composition obtained in Example 5 has the following performance parameters: Tni: 79℃, γ1: 40 mPa·s Δn: 0.099, ne: 1.567, Δε: 2.7, ε ⊥ : 2.6, K 11 : 13.7, K 33 : 14.7, and no crystals were precipitated from the liquid crystal composition after being stored at -20℃ for 480h.

[0146] Comparative Example 1

[0147] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 5:

[0148] Table 5: Components of the liquid crystal composition

[0149]

[0150]

[0151] The liquid crystal composition obtained in Comparative Example 1 has the following performance parameters: Tni: 79℃, γ1: 58 mPa·s Δn: 0.114, ne: 1.610, Δε: 7.6, ε ⊥ : 3.2, K 11 : 13.2, K 33 : 13.8, and no crystals were precipitated from the liquid crystal composition after being stored at -20℃ for 480h.

[0152] The 5 groups of liquid crystal compositions provided by the above embodiments 1 to 5 have a clearing point of 78-91℃, which makes the liquid crystal composition have good high temperature resistance; the rotational viscosity at 25℃ is 40-77mPa·s, which makes the liquid crystal composition have good rotational speed and is conducive to shortening the response time of the liquid crystal composition; the difference of birefringence at 25℃ is 0.099-0.122, which makes the liquid crystal composition have good light transmittance; the dielectric anisotropy at 25℃ is 2.7-8.4, which is conducive to 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 bending elastic coefficient of the liquid crystal composition is 13.5-14.8, and the splay elastic coefficient is 14.5-15.4, which is conducive to improving the average value of the elastic coefficient of the liquid crystal composition, effectively improving the problem of light leakage of the display panel when the liquid crystal composition is applied to the display panel and shortening the response time of the liquid crystal composition. Compared with Comparative Example 1, by adding the first compound represented by general formula (I), the clearing point, bending elastic coefficient, splay elastic coefficient and difference of birefringence of the liquid crystal composition in Example 2 are effectively improved, thereby more effectively improving the contrast ratio of the display panel when the liquid crystal composition is applied to the display panel and improving the response speed.

[0153] Please refer to Figure 2 The embodiment of the present application also provides a display panel 100, which comprises 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. Wherein the liquid crystal layer 103 comprises the liquid crystal composition as described above.

[0154] The first substrate 101 can be an array substrate, and the second substrate 102 can be a color film substrate. In some embodiments, when the first substrate 101 is an array substrate, the first substrate 101 comprises 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 comprises a source electrode and a drain electrode. The display panel further comprises a common electrode layer and a pixel electrode layer, wherein the pixel electrode layer is on a side of the third insulating layer away from the first substrate, and the pixel electrode layer comprises a pixel electrode electrically connected to the source electrode or the drain electrode. The common electrode layer comprises a common electrode, and the common electrode layer can be arranged on the first substrate 101, and the common electrode layer is between the pixel electrode layer and the source-drain layer, or the common electrode layer is on a side of the pixel electrode layer away from the first substrate; or the common electrode layer can be arranged on the second substrate 102, and the second substrate 102 comprises a second substrate, and the common electrode layer is on a side of the second substrate close to the liquid crystal layer. The display panel further comprises a color film layer, and the color film layer can be arranged on a side of the first substrate close to the liquid crystal layer or a side of the second substrate close to the liquid crystal layer.

[0155] The display panel 100 can be a display panel of a VA (Vertical Alignment), ECB (Electrically Controlled Birefringence), FFS (Fringe Field Switching), or IPS (In-Plane Switching) display mode.

[0156] The present application improves the display contrast and response time of a display panel using the liquid crystal composition by adding the first compound to the liquid crystal composition to improve the performance of the liquid crystal composition in terms of clearing point, optical anisotropy, elastic coefficient, and the like.

[0157] The present application improves the display contrast and response time of a display panel using the liquid crystal composition by adding the first compound to the liquid crystal composition to improve the performance of the liquid crystal composition in terms of clearing point, optical anisotropy, elastic coefficient, and the like.

[0158] The liquid crystal composition and the display panel provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by using specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description should not be understood as a limitation on the present application.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises at least one first compound represented by general formula (I): (Ⅰ)； Where m and n are independently selected from 0, 1, 2, and 3 respectively, and the sum of m and n is greater than or equal to 1; Each time it appears, it is selected independently. , , , , , , Each time it appears, it is selected independently. , , , , , , , , , , , , , , , , , , , as well as The H atoms in the sample are either unsubstituted or at least one H atom is substituted by any one of F, Cl, Br, or I atoms; L is selected from H, F, CF3, OCF3, Cl, Br, I, CN, or CH3. Z1 is selected from single bonds, -O-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CF2CF2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, substituted or unsubstituted alkyl groups having 1-7 carbon atoms, substituted or unsubstituted alkyl ethers having 1-7 carbon atoms, substituted or unsubstituted alkenyl groups having 2-7 carbon atoms, substituted or unsubstituted alkenyl ethers having 2-7 carbon atoms, substituted or unsubstituted alkynyl groups having 2-7 carbon atoms, and substituted or unsubstituted alkynyl ethers having 2-7 carbon atoms. Z2 is selected from substituted or unsubstituted alkane ethers having 1-7 carbon atoms, wherein the alkane ether is selected from... ; When any Z1 has an H group, the H in any Z1 is not substituted or at least one H is substituted by any atom of F, Cl, Br, or I; R1 and R2 are independently selected from H, F, Cl, Br, I, CN, SCN, NCS, SF5, CF3, OCF3, 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.

2. The liquid crystal composition according to claim 1, characterized in that, The terminal groups of R1 and R2 are independently monosubstituted by H, CN, or CF3, respectively; and / or, 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.

3. The liquid crystal composition according to claim 1, characterized in that, The first compound has a structure represented by at least one of the following general formulas: 。 4. The liquid crystal composition according to claim 3, characterized in that, The first compound has a structure represented by at least one of the following general formulas: 。 5. The liquid crystal composition according to claim 4, characterized in that, R1 is selected from H, F, 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.

6. The liquid crystal composition according to claim 1, characterized in that, L is selected from H, F, Cl, CN, and CH3; Z1 is selected from -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, non-substituted alkyl groups having 1-7 carbon atoms, non-substituted alkoxy groups having 2-7 carbon atoms, and non-substituted alkenyl groups having 2-7 carbon atoms.

7. The liquid crystal composition according to any one of claims 1 to 6, characterized in that, The liquid crystal composition further includes at least one second compound having a structure as shown in at least one of general formulas II-1 to II-7: R3 and R4 are independently selected from H, F, CF3, OCF3, 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. When R3 and / or R4 are selected from groups having H, the H in R3 and / or R4 is not substituted, or at least one H is substituted by any atom of F, Cl, Br, or I.

8. The liquid crystal composition according to claim 7, characterized in that, The liquid crystal composition further includes at least one third compound having a structure as shown in at least one of general formulas III-1 to III-19: Wherein, R5 and R6 are independently selected from H, F, CF3, OCF3, 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. When R5 and / or R6 are selected from groups having H, the H in R5 and / or R6 is not substituted or at least one H is substituted by any atom of F, Cl, Br, or I.

9. The liquid crystal composition according to claim 8, characterized in that, In the liquid crystal composition, the mass fraction of the first compound is greater than or equal to 1%, and the mass fraction of the first compound is less than or equal to 70%. In the liquid crystal composition, the mass fraction of the second compound is greater than or equal to 10%, and the mass fraction of the second compound is less than or equal to 85%. In the liquid crystal composition, the mass fraction of the third compound is greater than or equal to 10%, and the mass fraction of the third compound is less than or equal to 70%.

10. A display panel, characterized in that, It includes 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 a liquid crystal composition as described in any one of claims 1 to 9.

Images