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 general formula (I), at least one second compound selected from general formula (II) and at least one third compound selected from general formula (III), general formula (IV) or general formula (V), the present application reduces the driving voltage of the display panel or improves the response speed of the display panel by adding the first compound, the second compound and the third compound in the liquid crystal composition, thereby improving the display effect and product quality of the display panel using the liquid crystal composition.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display, in particular to a liquid crystal composition and a display panel. BACKGROUND

[0002] The liquid crystal display panel realizes the display function by applying voltage to the liquid crystal layer to realize the regulation of the optical performance of the material in the liquid crystal layer. The physical performance (such as viscosity, clearing point, dielectric anisotropy and optical anisotropy) of the liquid crystal material in the liquid crystal layer affects the display effect and product quality of the liquid crystal display panel. At present, in order to improve the display effect and performance of the display panel, there is still room for improvement in the various components in the liquid crystal compound applied to the liquid crystal layer to achieve better optical display effect and maintain the conventional display reliability requirement of the device to adapt to more application scenarios.

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

[0004] Based on the above deficiencies in the prior art, the present application provides a liquid crystal composition and a display panel. By adding a first compound, a second compound and a third compound in the liquid crystal composition, the liquid crystal composition reduces the driving voltage of the display panel or improves the response speed of the display panel when applied to the display panel, thereby improving the display effect and product quality of the display panel using the liquid crystal composition.

[0005] The present application provides a liquid crystal composition, which comprises at least one first compound represented by general formula (I), at least one second compound selected from general formula (II) and at least one third compound represented by general formula (III), general formula (IV) or general formula (V):

[0006]

[0007]

[0008] X is selected from O or S;

[0009] and are respectively and independently selected from at least one H substituted by any one atom of F, Cl, Br, I, H; and at least one H in is substituted by any one atom of F, Cl, Br, I, H;

[0010] m and n are respectively and independently selected from 0, 1, 2 or 3;

[0011] and independently from each other at each occurrence are selected from and H in each of the above groups is unsubstituted or at least one H is replaced by any one of F, Cl, Br, I;

[0012] m, n are independently from each other selected from 0, 1, 2 or 3;

[0013] Z1, Z2are independently from each other selected from a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CF2CF2-, -CF2CH2-, -CH2CF2-, -CHF-CHF-, -CH2O, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C-, H in any Z1and / or any Z2is unsubstituted or at least one H is replaced by any one of F, Cl, Br, I;

[0014] R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 are independently from each other at each occurrence selected from H, F, Cl, Br, CN, SF5, 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.

[0015] Preferably, substituted alkyl having 1 to 10 carbon atoms, substituted alkoxy having 1 to 10 carbon atoms, substituted alkenyl having 2 to 10 carbon atoms, substituted alkenyloxy having 2 to 10 carbon atoms, substituted alkynyl having 2 to 10 carbon atoms, and substituted alkynyloxy having 2 to 10 carbon atoms fulfill at least one of the following conditions:

[0016] the terminal groups are independently from each other mono-substituted by CN or CF3;

[0017] one or more -CH2- are independently from each other replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -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;

[0018] At least one H atom is substituted by any one of F, Cl, Br, or I atoms.

[0019] Preferably, the first compound has a structure as shown in at least one of general formulas (I-1) to (I-2):

[0020]

[0021] Preferably, the second compound has a structure as shown in at least one of general formulas (II-1) to (II-3):

[0022]

[0023] Preferably, the third compound has a structure as shown in at least one of the general formulas (Ⅲ-1) to (Ⅲ-11):

[0024]

[0025] Preferably, the third compound has a structure as shown in at least one of general formulas (Ⅳ-1) to (Ⅳ-4):

[0026]

[0027] Preferably, the third compound has a structure as shown in at least one of formulas (V-1) and (V-2):

[0028]

[0029]

[0030] Preferably, in the liquid crystal composition, the mass fraction of the first compound is greater than 0%, and the mass fraction of the first compound is less than or equal to 12%.

[0031] Preferably, in the liquid crystal composition, the mass fraction of the second compound is greater than or equal to 1%, and the mass fraction of the second compound is less than or equal to 15%.

[0032] When the third compound includes a compound represented by general formula (Ⅲ), the mass fraction of the compound represented by general formula (Ⅲ) in the liquid crystal composition is greater than or equal to 5%, and the mass fraction of the compound represented by general formula (Ⅲ) is less than or equal to 60%.

[0033] When the third compound includes a compound represented by general formula (Ⅳ), the mass fraction of the compound represented by general formula (Ⅳ) in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the compound represented by general formula (Ⅳ) is less than or equal to 20%.

[0034] When the third compound comprises a compound represented by general formula (V), the mass fraction of the compound represented by general formula (V) in the liquid crystal composition is greater than or equal to 20% and less than or equal to 60%.

[0035] 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.

[0036] The liquid crystal layer comprises the liquid crystal composition as described above.

[0037] The application reduces the driving voltage of the display panel or improves the response speed of the display panel by adding the first compound, the second compound and the third compound in the liquid crystal composition, thereby improving the display effect and product quality of the display panel using the liquid crystal composition. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0039] Figure 1 is a flow chart of the preparation method of the liquid crystal composition provided by the embodiments of the application;

[0040] Figure 2 is a structural schematic diagram of the display panel provided by the embodiments of the application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings of the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application. In the 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.

[0042] The application provides a liquid crystal composition and a display panel, by adding a first compound, a second compound and a third compound in the liquid crystal composition, the liquid crystal composition reduces the driving voltage of the display panel or improves the response speed of the display panel, so that the display effect and product quality of the display panel using the liquid crystal composition are improved.

[0043] The embodiment of the application provides a liquid crystal composition, which comprises at least one first compound represented by a general formula (I), at least one second compound selected from a general formula (II) and at least one third compound selected from a general formula (III), a general formula (IV) or a general formula (V):

[0044]

[0045]

[0046] X is selected from O or S;

[0047] and each occurrence is independently selected from and H in the above is unsubstituted or at least one H is substituted by any one of F, Cl, Br or I;

[0048] m and n are independently selected from 0, 1, 2 or 3;

[0049] Z1 and Z2 are independently selected from a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2CH2-, -CF2CF2-, -CF2CH2-, -(CH2)3-, -CH2CF2-, -CHF-CHF-, -CH2O, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C-, H in any Z1 and / or any Z2 is unsubstituted or at least one H is substituted by any one of F, Cl, Br or I;

[0050] R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 are independently selected from H, F, Cl, Br, CN, SF5, 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.

[0051] The first compound has negative dielectric anisotropy, and the addition of the first compound is conducive to increasing the clearing point, the absolute value of the birefringence difference, and the absolute value of the dielectric anisotropy value of the liquid crystal composition, and reducing the driving voltage when the liquid crystal composition is applied to a display panel, thereby improving the performance of the liquid crystal composition.

[0052] The addition of the second compound is conducive to increasing the birefringence difference and the elastic coefficient of the liquid crystal composition, and reducing the response time when the liquid crystal composition is applied to a display panel, thereby improving the performance of the liquid crystal composition.

[0053] When the third compound is selected from the compounds represented by general formula (III) to general formula (V), the absolute value of the dielectric anisotropy value of the liquid crystal composition is increased, and the rotational viscosity of the liquid crystal composition is reduced, which is conducive to reducing the response time when the liquid crystal composition is applied to a display panel and reducing the driving voltage when the liquid crystal composition is applied to a display panel, thereby improving the performance of the liquid crystal composition.

[0054] The present application adds the first compound, the second compound, and the third compound to the liquid crystal composition, which reduces the driving voltage or improves the response speed of the display panel when the liquid crystal composition is applied to the display panel, thereby improving the display effect and product quality of the display panel using the liquid crystal composition.

[0055] In the present embodiment, and In each of the optional groups, “-” represents a connection site.

[0056] In some embodiments, the substituted alkyl group having 1-10 carbon atoms, the substituted alkoxy group having 1-10 carbon atoms, the substituted alkenyl group having 2-10 carbon atoms, the substituted alkenyloxy group having 2-10 carbon atoms, the substituted alkynyl group having 2-10 carbon atoms, and the substituted alkynyloxy group having 2-10 carbon atoms satisfy at least one of the following conditions:

[0057] The terminal groups are independently monosubstituted by CN or CF3, respectively;

[0058] one or more -CH2- groups are independently replaced by -0-, -S-, -S02-, -CO-, -C(0)0-, -OC(O)-, -OC(0)0-, -CF2O-, -OCF2-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH20-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-, or -CºC-, and no direct bond between the heteroatoms directly bonded to C;

[0059] at least one H is replaced by any one of F, Cl, Br, I.

[0060] In some embodiments, at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 is selected from substituted alkyl having 1-10 carbon atoms, substituted alkoxy having 1-10 carbon atoms, substituted alkenyl having 2-10 carbon atoms, substituted alkenyloxy having 2-10 carbon atoms, substituted alkynyl having 2-10 carbon atoms, and substituted alkynyloxy having 2-10 carbon atoms, the terminal group of at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 is independently monosubstituted by H, CN, or CF3.

[0061] In some embodiments, at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 is selected from substituted alkyl having 1-10 carbon atoms, substituted alkoxy having 1-10 carbon atoms, substituted alkenyl having 2-10 carbon atoms, substituted alkenyloxy having 2-10 carbon atoms, substituted alkynyl having 2-10 carbon atoms, and substituted alkynyloxy having 2-10 carbon atoms, one or more -CH2- groups of at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 is independently replaced by -0-, -S-, -S02-, -CO-, -C(0)0-, -OC(O)-, -OC(0)0-, -CF2O-, -OCF2-, -CF2-CF2-, -CF2-CH2-, -CH2-CF2-, -CHF-CHF-, -CH20-, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH-, or -CºC-, and no direct bond between the heteroatoms directly bonded to C.

[0062] R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10at least one of R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is selected from the group consisting of substituted alkyl having 1 to 10 carbon atoms, substituted alkoxy having 1 to 10 carbon atoms, substituted alkenyl having 2 to 10 carbon atoms, substituted alkenyloxy having 2 to 10 carbon atoms, substituted alkynyl having 2 to 10 carbon atoms, and substituted alkynyloxy having 2 to 10 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by any one of F, Cl, Br, and I.

[0063] In some embodiments, R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are independently selected from the group consisting of H, F, Cl, Br, 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, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, and substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F.

[0064] In some embodiments, R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are independently selected from the group consisting of H, F, Cl, Br, 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, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, and substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F.

[0065] In some embodiments, R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are independently selected from the group consisting of H, F, Cl, Br, 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, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, and substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F.

[0066] In some embodiments, R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are independently selected from the group consisting of H, F, Cl, Br, 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, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, and substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F.

[0067] In some embodiments, R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are independently selected from the group consisting of H, F, Cl, Br, 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, substituted or unsubstituted alkenyloxy having 2 to 7 carbon atoms, substituted or unsubstituted alkynyl having 2 to 7 carbon atoms, and substituted or unsubstituted alkynyloxy having 2 to 7 carbon atoms. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F. 10 at least one H in R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10is substituted by F.

[0068] R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are each independently selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, heteroalicyclyl, cycloalkyl, cycloalkenyl, halo, haloalkyl, haloalkenyl, haloalkynyl, xanthate, dithioalkyl, alkylcarbonyl, alkylcarbonylalkyl, hydroxy, hydroxyalkyl, alkoxyalkyl, oxo, thioxo, carboxyl, alkylcarbonyloxy, alkoxycarbonyl, alkylcarbonylthio, alkoxylcarbonylthio, carboxylate, silyl, amino, amido, nitro, cyano, acyl, acyloxyl, thioalkyl, imino, thioimino, sulfonato, sulfonyl, sulfanyl, sulfenyl, sulfinyl, sulfonic acid, sulfonic acid ester, selenoalkyl, selenyl, selenoxy, seleninic acid, seleninic acid ester, telluroalkyl, telluryl, telluroxy, telluric acid, telluric acid ester, guanidinyl, urea, thiourea, and combinations thereof. 10 When R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are each independently selected from alkenyl, the alkenyl can be straight-chained or branched alkenyl and can be an isomer of either the E or Z configuration and have at least one carbon-carbon double bond, preferably straight-chained 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; further preferably prop-2-enyl, but-2-enyl, but-3-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl.

[0069] When R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are each independently selected from alkenyl, the alkenyl can be straight-chained or branched alkenyl and can be an isomer of either the E or Z configuration and have at least one carbon-carbon double bond, preferably straight-chained 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; further preferably prop-2-enyl, but-2-enyl, but-3-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl. 10 When R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10are each independently selected from alkenyl, the alkenyl can be straight-chained or branched alkenyl and can be an isomer of either the E or Z configuration and have at least one carbon-carbon double bond, preferably straight-chained 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; further preferably prop-2-enyl, but-2-enyl, but-3-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl.

[0070] In some embodiments, X is preferably selected from O or S.

[0071] In some embodiments, and are each independently preferably selected from

[0072] In some embodiments, the first compound has a structure according to at least one of the general formulas (I-1) to (I-2):

[0073]

[0074]

[0075] In some embodiments, the first compound is selected from the group consisting of the following compounds:

[0076]

[0077] In some embodiments, the second compound has a structure according to at least one of the following general formulae (II-1) to (II-3):

[0078]

[0079] In some embodiments, the second compound is selected from the following compounds:

[0080]

[0081] In some embodiments, Z1and Z2are each independently selected from a single bond, -CH2O-, -CH2-CH2-.

[0082] In some embodiments, R3and R4are each independently selected from H, alkyl having 1-4 carbon atoms, alkoxy having 1-4 carbon atoms, alkenyl having 1-4 carbon atoms.

[0083] In some embodiments, the third compound has a structure according to at least one of the following general formulae (III-1) to (III-11):

[0084]

[0085]

[0086] In some embodiments, the third compound has a structure according to at least one of the following general formulae (IV-1) to (IV-4):

[0087]

[0088] In some embodiments, the third compound has a structure according to at least one of the following formulae (V-1) and (V-2):

[0089]

[0090] In some embodiments, the third compound is selected from the following compounds:

[0091]

[0092]

[0093] In the liquid crystal composition, the mass fraction of the first compound is greater than 0%, and the mass fraction of the first compound is less than or equal to 12%, for example, can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, etc. In the liquid crystal composition, the sum of the mass fractions of the first compound and the second compound is greater than or equal to 88%, for example, can be 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0094] In some embodiments, in the liquid crystal composition, the mass fraction of the second compound is greater than or equal to 1%, and the mass fraction of the second compound is less than or equal to 15%, for example, can be 2%, 3%, 5%, 7%, 9%, 10%, 11%, 13%, etc.

[0095] In some embodiments, when the third compound comprises a compound represented by general formula (III), the mass fraction of the compound represented by general formula (III) in the liquid crystal composition is greater than or equal to 5%, and the mass fraction of the compound represented by general formula (III) is less than or equal to 60%, for example, can be 10%, 20%, 30%, 40%, 50%, etc.

[0096] In some embodiments, when the third compound comprises a compound represented by general formula (IV), the mass fraction of the compound represented by general formula (IV) in the liquid crystal composition is greater than or equal to 1%, and the mass fraction of the compound represented by general formula (IV) is less than or equal to 20%, for example, can be 2%, 5%, 8%, 10%, 12%, 15%, 18%, etc.

[0097] In some embodiments, when the third compound comprises a compound represented by general formula (V), the mass fraction of the compound represented by general formula (V) in the liquid crystal composition is greater than or equal to 20%, and the mass fraction of the compound represented by general formula (V) is less than or equal to 60%, for example, can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, etc.

[0098] The response time and driving voltage of the liquid crystal composition can be calculated by the following formula, respectively:

[0099] Formula 1:

[0100] Formula 2:

[0101] In formula 1, RT_t offrepresents the response time of the display panel in the off state with the liquid crystal composition, γ1 represents the rotational viscosity of the liquid crystal composition, d represents the thickness of the liquid crystal layer formed when the liquid crystal composition is applied to the display panel, π is the constant of the circular ratio, K 22 represents the twist elastic modulus of the liquid crystal composition. As can be seen from formula 1, the smaller the ratio of γ1 to K 22 , the shorter the response time and the faster the response speed of the liquid crystal composition.

[0102] In formula 2, V th represents the threshold voltage of the liquid crystal composition, |Δε| represents the absolute value of the dielectric anisotropy, and ε0 is the vacuum dielectric constant. As can be seen from formula 2, the smaller the ratio of K 22 to |Δε|, the lower the driving voltage of the liquid crystal composition.

[0103] In some embodiments, the birefringence difference of the liquid crystal composition at 25°C is greater than or equal to 0.06, and the birefringence difference of the liquid crystal composition at 25°C is less than or equal to 0.22, for example: 0.07, 0.08, 0.09, 0.1, 0.105, 0.11, 0.115, 0.12, 0.125, 0.15, 0.175, 0.2, 0.21, etc. so that the birefringence difference of the liquid crystal composition is within a suitable range, so that the liquid crystal composition can be adapted to display panels with different liquid crystal layer thicknesses, adjust the light transmittance of the display panel, so that the display panel meets the light transmittance requirements of different display effects, and is suitable for various use scenarios.

[0104] In some embodiments, the rotational viscosity of the liquid crystal composition at 25°C is greater than or equal to 10 mPa·s, and the rotational viscosity of the liquid crystal composition at 25°C is less than or equal to 200 mPa·s, for example: 20 mPa·s, 30 mPa·s, 40 mPa·s, 50 mPa·s, 60 mPa·s, 70 mPa·s, 72 mPa·s, 73 mPa·s, 75 mPa·s, 78 mPa·s, 80 mPa·s, 82 mPa·s, 85 mPa·s, 90 mPa·s, 100 mPa·s, 110 mPa·s, 120 mPa·s, 130 mPa·s, 140 mPa·s, 150 mPa·s, 160 mPa·s, 170 mPa·s, 180 mPa·s, 190 mPa·s, etc. so that the rotational viscosity of the liquid crystal composition is within a suitable range, the rotational speed of the liquid crystal composition is improved, the response time of the liquid crystal composition is within a suitable range, and the rotational viscosity of the liquid crystal composition does not affect the performance of the liquid crystal composition.

[0105] 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 25, for example: 12, 13, 14, 15, 18, 20, 22, 24, 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 25, for example: 12, 13, 14, 15, 18, 20, 22, 24, etc.; the bend elastic constant of the liquid crystal composition and / or the splay elastic constant of the liquid crystal composition within the above range is conducive to improving the light transmittance of the liquid crystal composition and improving the response time of the liquid crystal composition, ensuring that the light transmittance and the response time of the liquid crystal composition are within a suitable range.

[0106] In some embodiments, the twist elastic constant of the liquid crystal composition is greater than or equal to 5, the twist elastic constant of the liquid crystal composition is less than or equal to 10, for example: 5.5, 6, 6.5, 7, 7.5, 8, 9, etc., which is conducive to improving the corresponding speed of the liquid crystal composition when applied to the display panel, and reducing the driving voltage.

[0107] In some embodiments, the dielectric anisotropy of the liquid crystal composition at 25°C is greater than or equal to -10, the dielectric anisotropy of the liquid crystal composition at 25°C is less than or equal to 15, for example: -8, -6, -5, -4.2, -4.1, -4, -3.8, -3.7, -3, -2, 2, 4, 5, 8, 10, 12, etc., which is conducive to reducing 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.

[0108] In some embodiments, the clearing point of the liquid crystal composition is preferably 60°C to 135°C, for example, the clearing point of the liquid crystal composition can be 62°C, 65°C, 68°C, 70°C, 75°C, 78°C, 80°C, 82°C, 84°C, 88°C, 90°C, 92°C, 95°C, 100°C, 110°C, 115°C, 120°C, 125°C, 130°C, etc., so as to avoid the decrease of the high temperature resistance of the liquid crystal composition caused by the too low clearing point of the liquid crystal composition.

[0109] Please refer to Figure 1 The present application provides an exemplary preparation method of the liquid crystal composition, as shown below:

[0110] The preparation method of the liquid crystal composition comprises:

[0111] S100, weighing and mixing the first compound, the second compound and the third compound in a first order according to the mass percentage to obtain a first mixture.

[0112] The first order is preferably that the first compound, the second compound and the third compound are weighed and mixed in the order of the melting point from low to high.

[0113] S200, stirring the first mixture at a first heating temperature to sufficiently mix the first compound, the second compound and the third compound in the first mixture.

[0114] The first heating temperature is preferably 60-100℃.

[0115] S300, cooling the first mixture to room temperature and packaging to obtain the liquid crystal composition.

[0116] The exemplary combination of the liquid crystal composition of the present application is shown in the following exemplary embodiments 1-2.

[0117] Embodiment 1

[0118] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 1:

[0119] Table 1: Components of the liquid crystal composition

[0120]

[0121]

[0122] The liquid crystal composition obtained in Example 1 has the following performance parameters: Tni: 76℃, γ1: 80mPa·s Δn: 0.1109, Δε: -3.9, K 11 : 14.8, K 22 : 7.4, K 33 : 15.8, γ1 / K 22 : 10.8, K 22 |Δε|: 1.9. 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 birefringence difference, representing the optical anisotropy of the liquid crystal composition at 25℃; Δε represents the dielectric constant anisotropy value of the liquid crystal composition at 25℃; K 11 represents the bending elastic coefficient of the liquid crystal composition, K 22 represents the twist elastic coefficient of the liquid crystal composition, K 33 represents the splay elastic coefficient of the liquid crystal composition.

[0123] Embodiment 2

[0124] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this embodiment are shown in Table 2:

[0125] Table 2: Components of the liquid crystal composition

[0126]

[0127]

[0128] The liquid crystal composition obtained in Example 2 has the following performance parameters: Tni: 70℃, γ1: 73.44 mPa-s, Δn: 0.1162, Δε: -3.9, K 11 : 12.66, K 22 : 6.33, K 33 : 15.33, γ1 / K 22 : 11.6, K 22 : 1.62.

[0129] Example 3

[0130] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 3:

[0131] Table 3: Components of the liquid crystal composition

[0132]

[0133]

[0134] The liquid crystal composition obtained in Example 3 has the following performance parameters: Tni: 70.5℃, γ1: 73 mPa-s, Δn: 0.1108, Δε: -4.0, K 11 : 12.2, K 22 : 6.1, K 33 : 15.44, γ1 / K 22 : 11.97, K 22 : 1.53.

[0135] Comparative Example 1

[0136] The structural formula and mass fraction of each compound in the liquid crystal composition selected in this example are shown in Table 4:

[0137] Table 4: Components of the liquid crystal composition

[0138]

[0139]

[0140] The liquid crystal composition obtained in Comparative Example 1 has the following performance parameters: Tni: 77°C, γ1: 88 mPa-s, Δn: 0.1104, Δε: -3.8, K 11 : 15.7, K 22 : 7.8, K 33 : 17.4, γ1 / K 22 : 11.2, K 22 : 2.05.

[0141] Comparative Example 2

[0142] The structural formula and mass fraction of each compound in the liquid crystal composition selected in the present comparative example are shown in Table 5:

[0143] Table 5: Components of the liquid crystal composition

[0144]

[0145]

[0146]

[0147] The liquid crystal composition obtained in Comparative Example 2 has the following performance parameters: Tni: 72°C, γ1: 77.6 mPa-s, Δn: 0.1074, Δε: -3.58, K 11 : 11.94, K 22 : 5.97, K 33 : 15.35, γ1 / K 22 : 13.0, K 22 : 1.67.

[0148] Comparative Example 3

[0149] The structural formula and mass fraction of each compound in the liquid crystal composition selected in the present comparative example are shown in Table 6:

[0150] Table 6: Components of the liquid crystal composition

[0151]

[0152]

[0153] The liquid crystal composition obtained in Comparative Example 3 has the following performance parameters: Tni: 68°C, γ1: 78 mPa-s, Δn: 0.1075, Δε: -3.75, K 11 : 13.1, K 22 : 6.6, K 33 : 16.8, γ1 / K 22 : 11.8, K 22|Δε| : 1.76.

[0154] The three groups of liquid crystal compositions provided by the above-mentioned embodiments 1 to 3 have a clearing point of 70 to 76 DEG C, so that the liquid crystal compositions have good high-temperature resistance; the rotational viscosity at 25 DEG C is 73 to 80 mPa s, so that the liquid crystal compositions have good rotational speed, which is conducive to shortening the response time of the liquid crystal compositions; the birefringence difference at 25 DEG C is 0.1108 to 0.1162, so that the liquid crystal compositions have good light transmittance; the dielectric anisotropy at 25 DEG C is -3.9 to -4.0, which is conducive to driving the liquid crystal compositions at a lower driving voltage, thereby reducing the power consumption of the display panel using the liquid crystal compositions; the bending elastic coefficient of the liquid crystal compositions is 12.2 to 14.8, the twist elastic coefficient is 6.1 to 7.4, and the splay elastic coefficient is 15.33 to 15.8, which is conducive to improving the light transmittance of the liquid crystal compositions, reducing the response time of the liquid crystal compositions, and reducing the driving voltage of the liquid crystal compositions. Meanwhile, compared with the comparative example 1, the ratio of γ1 / K 22 and the ratio of K 22 |Δε| are smaller in the embodiment 1, which indicates that the liquid crystal composition in the embodiment 1 has a shorter response time and a lower driving voltage. Compared with the comparative example 2, the ratio of γ1 / K 22 and the ratio of K 22 |Δε| are smaller in the embodiment 2, which indicates that the liquid crystal composition in the embodiment 2 has a shorter response time and a lower driving voltage. Compared with the comparative example 3, the clearing point is higher and the ratio of K 22 |Δε| is smaller in the embodiment 3, which indicates that the liquid crystal composition in the embodiment 3 has stronger heat resistance and a lower driving voltage.

[0155] Please refer to Figure 2 , the embodiment of the present application further 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.

[0156] 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.

[0157] 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.

[0158] The display panel provided by the application reduces the driving voltage or improves the response speed of the display panel by adding the first compound, the second compound, and the third compound as shown in the general formula (I) to the liquid crystal composition used in the liquid crystal layer, thereby improving the display effect and product quality of the display panel using the liquid crystal composition.

[0159] 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 general formula (I), at least one second compound selected from general formula (II) and at least one third compound selected from general formula (III), general formula (IV) or general formula (V), by adding the first compound, the second compound and the third compound in the liquid crystal composition, the display panel applied with the liquid crystal composition has reduced driving voltage or improved response speed, thereby improving the display effect and product quality of the display panel applied with the liquid crystal composition.

[0160] The above describes the liquid crystal composition and the display panel provided by the embodiment of the present application in detail, the principle and the implementation mode of the present application are described by applying specific examples in the text, the above embodiment is only used for helping to understand the method and the core idea of the present application; meanwhile, according to the idea of the present application, the specific implementation mode and the application range will be changed by the person skilled in the art, and the above is not understood as the limitation of 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), at least one second compound selected from general formula (II), and at least one third compound selected from general formula (III), general formula (IV), or general formula (V): (Ⅰ)； (Ⅴ)； The general formula (II) has a structure as shown in at least one of the general formulas (II-1) to (II-3): ； The general formula (III) has a structure as shown in at least one of the general formulas (III-1) to (III-11): ； The general formula (Ⅳ) has a structure as shown in at least one of the general formulas (Ⅳ-1) to (Ⅳ-4): ； Where X is selected from O or S; R1, R2, R3, R4, R5, R6, R7, R8, R9, R 10 Each is independently selected from H, F, Cl, Br, CN, SF5, 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 alkenyl groups having 2-10 carbon atoms, substituted or unsubstituted alkynyl groups having 2-10 carbon atoms, and substituted or unsubstituted alkynyl groups having 2-10 carbon atoms. In the liquid crystal composition, the mass fraction of the compound represented by general formula (I) is greater than 0%, and the mass fraction of the compound represented by general formula (I) is less than or equal to 12%; the mass fraction of the compound represented by general formula (II) is greater than or equal to 1%, and the mass fraction of the compound represented by general formula (II) is less than or equal to 15%; the mass fraction of the compound represented by general formula (III) is greater than or equal to 5%, and the mass fraction of the compound represented by general formula (III) is less than or equal to 60%; the mass fraction of the compound represented by general formula (IV) is greater than or equal to 1%, and the mass fraction of the compound represented by general formula (IV) is less than or equal to 20%; the mass fraction of the compound represented by general formula (V) is greater than or equal to 20%, and the mass fraction of the compound represented by general formula (V) is less than or equal to 60%. The torsional elastic modulus of the liquid crystal composition is greater than or equal to 5, and the torsional elastic modulus of the liquid crystal composition is less than or equal to 10.

2. The liquid crystal composition according to claim 1, characterized in that, A substituted alkyl group having 1-10 carbon atoms, a substituted alkoxy group having 1-10 carbon atoms, a substituted alkenyl group having 2-10 carbon atoms, a substituted alkenyl group having 2-10 carbon atoms, a substituted alkynyl group having 2-10 carbon atoms, and a substituted alkynyl group having 2-10 carbon atoms satisfy at least one of the following conditions: The terminal groups are independently monosubstituted by CN or CF3; One or more -CH2- atoms are independently replaced by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -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; At least one H atom is substituted by any one of F, Cl, Br, or I atoms.

3. The liquid crystal composition according to claim 1, characterized in that, The first compound has a structure as shown in at least one of the general formulas (I-1) to (I-2): 。 4. The liquid crystal composition according to claim 1, characterized in that, The third compound has a structure as shown in at least one of formulas (V-1) and (V-2): (Ⅴ-1) (Ⅴ-2)。 5. 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 the liquid crystal composition as described in any one of claims 1 to 4.

Images