Liquid crystal composition and liquid crystal display panel

Abstract

An embodiment of the present application provides a liquid crystal composition comprising a first compound, a second compound, a third compound, and a fourth compound, which has the characteristics of a high elastic constant (K), a high dielectric anisotropy, and adjustable optical anisotropy, and can reduce the response time of the liquid crystal composition when applied to a display panel and improve the contrast of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a liquid crystal composition and a liquid crystal display panel. Background Art

[0002] Liquid crystal compounds are widely used in various display applications. To achieve better display quality and performance, the contrast and response time of existing displays are in urgent need of improvement. The contrast and response time of liquid crystal displays are closely related to the liquid crystal material. Specifically, the dielectric anisotropy, polarity, clearing point, and optical anisotropy of the liquid crystal material are all closely related to the display quality and performance of liquid crystal displays.

[0003] In summary, it is necessary to develop materials with faster response speed and higher contrast to adapt to the continuous development of displays. Summary of the Invention

[0004] The embodiments of the present application provide a liquid crystal composition and a liquid crystal display panel to solve the technical problem that the response speed of existing liquid crystal display panels needs to be improved.

[0005] To solve the above problems, the present invention provides the following technical solutions:

[0006] The present embodiment provides a liquid crystal composition, including:

[0007] At least one first compound represented by formula (I):

[0008] At least one second compound represented by formula (II):

[0009] At least one third compound represented by formula (III):

[0010] as well as

[0011] At least one fourth compound represented by formula (IV):

[0012]

[0013] wherein X is selected from O or S;

[0014] n is an integer selected from 0 to 7;

[0015] Z is selected from a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O- or -C≡C-, or the following groups wherein at least one H is substituted or unsubstituted by F, Cl, Br or I: -CH2O-, -OCH2-, -CH2-CH2-, -(CH2)3- or -CH=CH-;

[0016] Each is independently selected from the following groups, each is independently selected from a single bond, or at least one H is substituted or unsubstituted by F, Cl, Br or I:

[0017] and At least one of them is selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I:

[0018] Each is independently selected from a single bond, or the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I:

[0019]

[0020] R1, R2, R3 and R4 are each independently selected from H, F, Cl, Br, I, CN, SCN, NCS, CF3 or SF5, or selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: alkyl groups of 1 to 15 carbon atoms, alkoxy groups of 1 to 15 carbon atoms, alkenyl groups of 2 to 15 carbon atoms, alkenyloxy groups of 2 to 15 carbon atoms, alkynyl groups of 2 to 15 carbon atoms, and alkynyloxy groups of 2 to 15 carbon atoms.

[0021] In some embodiments of the present application, the terminal groups of R1 and R2 are each independently selected from H, CN or CF3;

[0022] And / or, at least one methylene group in R1 and at least one methylene group in R2 are each independently substituted by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2O or -OCH2-, and the heteroatom is not directly bonded.

[0023] In some embodiments of the present application, based on the total mass of the liquid crystal composition, the mass fraction of the first compound is 15% to 50%, and the mass fraction of the second compound is 1 to 60%.

[0024] In some embodiments of the present application, based on the total mass of the liquid crystal composition,

[0025] The mass fraction of the first compound is 20% to 45%;

[0026] And / or, the mass fraction of the second compound is 3% to 55%;

[0027] And / or, the mass fraction of the third compound is 1% to 25%;

[0028] And / or, the mass fraction of the fourth compound is 1% to 25%.

[0029] In some embodiments of the present application, the second compound is selected from at least one of the compounds represented by Formula II-1 to Formula II-51:

[0030]

[0031]

[0032]

[0033] In some embodiments of the present application, the liquid crystal composition further comprises at least one fifth compound represented by formula (V):

[0034] wherein R5 and R6 are each independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

[0035] In some embodiments of the present application, based on the total mass of the liquid crystal composition, the mass fraction of the fifth compound is 1% to 20%.

[0036] In some embodiments of the present application, the liquid crystal composition further comprises at least one sixth compound represented by formula (VI):

[0037] wherein R7 and R8 are each independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

[0038] In some embodiments of the present application, based on the total mass of the liquid crystal composition, the mass fraction of the sixth compound is 1% to 15%.

[0039] In some embodiments of the present application, the liquid crystal composition further comprises at least one seventh compound represented by formula (VII):

[0040] Among them, R9 and R 10 Each is independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

[0041] In some embodiments of the present application, based on the total mass of the liquid crystal composition, the mass fraction of the seventh compound is 1% to 15%.

[0042] In some embodiments of the present application, a first substrate and a second substrate are arranged opposite to each other, and a liquid crystal layer is sandwiched between the first substrate and the second substrate, and the liquid crystal layer includes the liquid crystal composition according to any one of claims 1 to 11.

[0043] In some embodiments of the present application, the liquid crystal display panel further includes a color resist layer, and the color resist layer is disposed on a side of the second substrate facing the first substrate;

[0044] The color resist layer includes a red color resist, and based on the total mass of the red pigment in the red color resist, the red pigment includes a water-soluble pigment with a mass fraction less than or equal to 1.5%; 90% of the pigment particles in the red pigment are less than or equal to 100 nanometers.

[0045] The beneficial effects of the present invention are as follows: the liquid crystal composition provided in the embodiment of the present application, comprising the above-mentioned first compound, second compound, third compound and fourth compound, has the characteristics of high elastic constant (K), high dielectric anisotropy and adjustable optical anisotropy, which can reduce the response time of the liquid crystal composition applied to the display panel and improve the contrast of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic structural diagram of a liquid crystal display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0049] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0050] The present invention provides a liquid crystal composition applicable to a liquid crystal display panel, wherein the liquid crystal composition includes at least one first compound, at least one second compound, at least one third compound, and at least one fourth compound.

[0051] The structural formula of the first compound is shown in formula (I):

[0052] R1 and R2 are each independently selected from H, F, Cl, Br, I, CN, SCN, NCS, CF3, SF5, a substituted or unsubstituted alkyl group having 1 to 15 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 15 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 15 carbon atoms, a substituted or unsubstituted alkenyloxy group having 2 to 15 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 15 carbon atoms, or a substituted or unsubstituted alkynyloxy group having 2 to 15 carbon atoms. The number of carbon atoms may specifically be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0053] In the examples of the present application, unless otherwise specified, "substituted or unsubstituted" means that at least one H atom in the group is substituted by F, Cl, Br or I.

[0054] The structural formula of the second compound is shown in formula (II): (II), wherein R1 and R2 are the same as the selectable groups of R1 and R2 mentioned above, which will not be repeated here.

[0055] Z is selected from a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -C≡C-, or a substituted or unsubstituted group: -CH2O-, -OCH2-, -CH2-CH2-, -(CH2)3- or -CH=CH-.

[0056] Each is independently selected from each is independently selected from a single bond, or a substituted or unsubstituted group: in, At least one of the following groups is selected from the group consisting of substituted or unsubstituted:

[0057] The structural formula of the third compound is shown in formula (III):

[0058] Among them, R1 and R2 have the same selectable group range as the aforementioned R1 and R2, which will not be repeated here.

[0059] are each independently selected from a single bond, or a substituted or unsubstituted group:

[0060]

[0061]

[0062] The structural formula of the fourth compound is shown in formula (IV):

[0063]

[0064] wherein X is selected from O or S.

[0065] n is selected from an integer of 0 to 7, such as 0, 1, 2, 3, 4, 5, 6 or 7.

[0066] R3 and R4 are each independently selected from H, F, Cl, Br, I, CN, SCN, NCS, CF3, SF5, or a substituted or unsubstituted group consisting of an alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, an alkenyloxy group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, or an alkynyloxy group having 2 to 15 carbon atoms. The number of carbon atoms may specifically be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0067] The response time of liquid crystals is negatively correlated with dielectric anisotropy and positively correlated with the rotational viscosity of the liquid crystal. The first compound having structural formula I has a low clearing point and low rotational viscosity and can be used as a diluent for liquid crystal compositions to reduce their response time. The second compound having structural formula II has a high clearing point and high rotational viscosity and can be used to increase the clearing point of liquid crystal compositions and adjust their optical anisotropy. The third compound having structural formula III has a high clearing point, high rotational viscosity, and high optical anisotropy and can be used to increase the clearing point and dielectric anisotropy of liquid crystal compositions, thereby reducing their response time. The fourth compound having structural formula IV has a high clearing point, medium rotational viscosity, high dielectric anisotropy, and high optical anisotropy and can be used to increase the dielectric anisotropy of liquid crystal compositions and reduce their response time.

[0068] Therefore, the liquid crystal composition provided by the embodiment of the present application, which includes the above-mentioned first compound, second compound, third compound and fourth compound, has the characteristics of high elastic constant (K), high dielectric anisotropy and adjustable optical anisotropy, which can reduce the response time of the liquid crystal composition applied to the display panel and improve the contrast of the display panel.

[0069] In some embodiments, the terminal groups of R1 and R2 are each independently selected from H, CN, or CF3.

[0070] In some embodiments, at least one methylene group in R1 and at least one methylene group in R2 can each independently be substituted by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2O, or -OCH2- so that the heteroatom is not directly bonded.

[0071] Further, at least one methylene group in R1 and at least one methylene group in R2 can each independently be substituted by -CF2O-, -OCF2-, -CH2CH2-, -CF2CF2-, -CF2CH2-, -(CH2)3-, -CH2CF2-, -CHF-CHF-, -CH2O, -OCH2-, -CF=CH-, -CH=CF-, -CF=CF-, -CH=CH- or -C≡C-.

[0072] In the embodiments of the present application, the mass fraction of the first compound is 15% to 50%, and the mass fraction of the second compound is 1% to 60%, based on the total mass of the liquid crystal composition. Within this mass fraction range, the stability of the liquid crystal composition at low temperatures (-20°C) is ensured, preventing crystal precipitation, while also improving response time.

[0073] Preferably, the mass fraction of the first compound is 20% to 45%, specifically 20%, 21%, 22%, 23%, 24%, 25%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44% or 45%.

[0074] Furthermore, the first compound is selected from at least one of the compounds represented by the following structural formulas:

[0075] wherein n is selected from an integer of 1 to 15, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15.

[0076] Preferably, the mass fraction of the second compound is 3% to 55%, specifically 4% to 54%, 5% to 50%, 9% to 45%, 15% to 45%, 20% to 35%, 30% to 45% or 40% to 55%.

[0077] Furthermore, the second compound is selected from at least one of the compounds represented by Formula II-1 to Formula II-51:

[0078]

[0079]

[0080] Furthermore, in the compounds represented by formula II-1 to formula II-51 above, R1 and R2 are each independently selected from an alkyl group having 2 to 15 carbon atoms, an alkoxy group having 2 to 15 carbon atoms, an alkenyl group having 3 to 15 carbon atoms, an alkenyloxy group having 3 to 15 carbon atoms, an alkynyl group having 3 to 15 carbon atoms, or an alkynyloxy group having 3 to 15 carbon atoms.

[0081] In the embodiments of the present application, the mass fraction of the third compound is 1% to 25%, and may be specifically 2% to 25%, 3% to 22%, 5% to 20%, 8% to 18%, 10% to 18%, or 10% to 15%.

[0082] Furthermore, the structural formula of the third compound is selected from at least one of the compounds represented by the following structural formulas:

[0083] wherein R1 and R2 are independently selected from an alkyl group having 2 to 15 carbon atoms, an alkoxy group having 2 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, an alkenyloxy group having 2 to 15 carbon atoms, an alkynyl group having 2 to 15 carbon atoms, or an alkynyloxy group having 2 to 15 carbon atoms.

[0084] In the embodiments of the present application, the mass fraction of the fourth compound is 1% to 25%, specifically 2% to 20%, 3% to 20%, 6% to 18%, 8% to 15%, or 10% to 15%.

[0085] In some embodiments of the present application, the liquid crystal composition further comprises at least one fifth compound represented by formula (V):

[0086] R5 and R6 may each be independently selected from the following groups which are substituted or unsubstituted: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms.

[0087] The fifth compound having the above formula V has high optical anisotropy and low rotational viscosity, and can be used to further improve the optical anisotropy of the liquid crystal composition, which is beneficial to improving the transmittance of the liquid crystal display panel.

[0088] In the embodiment of the present application, based on the total mass of the liquid crystal composition, the mass percentage of the fifth compound is 1% to 20%, preferably 1% to 15%, and particularly preferably 3% to 10%.

[0089] In some embodiments of the present application, the liquid crystal composition further comprises at least one sixth compound represented by formula (VI):

[0090] R7 and R8 may each be independently selected from the following substituted or unsubstituted groups: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms. The number of carbon atoms may specifically be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0091] The sixth compound having the above structural formula VI has a relatively high negative dielectric anisotropy, a relatively high clearing point, a relatively high optical anisotropy, and a relatively low rotational viscosity, which can further enhance the optical anisotropy of the liquid crystal composition, thereby facilitating the improvement of the transmittance of the liquid crystal display panel.

[0092] In the embodiment of the present application, based on the total mass of the liquid crystal composition, the mass percentage of the sixth compound is 1% to 15%, preferably 1% to 10%, and particularly preferably 2% to 8%.

[0093] In some embodiments of the present application, the liquid crystal composition further comprises at least one seventh compound represented by formula (VII):

[0094] Among them, R9 and R 10 Each is independently selected from the following substituted or unsubstituted groups: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms. The number of carbon atoms may specifically be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0095] The seventh compound having the structural formula VII has a high optical anisotropy and a high clearing point, and can further improve the optical anisotropy of the liquid crystal composition, which is beneficial to improving the transmittance of the liquid crystal display panel.

[0096] In an embodiment of the present application, based on the total mass of the liquid crystal composition, the mass percentage of the seventh compound is 1% to 15%, preferably 1% to 8%, and particularly preferably 1% to 5%.

[0097] In some embodiments, the liquid crystal composition further comprises an eighth compound represented by formula (VIII):

[0098] Among them, R 15 and R 16 Each is independently selected from the following substituted or unsubstituted groups: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, or an alkynyloxy group having 2 to 10 carbon atoms. The number of carbon atoms may specifically be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15.

[0099] The preparation of the liquid crystal composition in the embodiment of the present application can be prepared by a thermal dissolution method, specifically including: S10, weighing the liquid crystal compound according to the mass percentage using a balance, wherein there is no specific requirement for the weighing and adding order, and the liquid crystal compounds are usually weighed and mixed in the order of low to high melting points; S20, heating and stirring at 60-100°C to fully dissolve and mix the components; S30, cooling to room temperature, and encapsulating to obtain the target sample.

[0100] Tables 1 through 6 below show the compositional distribution and performance parameters of the liquid crystal compositions of the Examples and Comparative Examples of this application. Temperature is in °C; Tni represents the clearing point of the liquid crystal composition (unit: °C); Δn represents the optical anisotropy at 25°C; ne is the refractive index of extraordinary light; γ1 represents the rotational viscosity at 25°C (unit: mPa·s); Δε represents the dielectric anisotropy at 25°C; ε⊥ is the dielectric constant perpendicular to the long axis of the liquid crystal molecules; K11 is the splay elastic coefficient; and K33 is the bend elastic coefficient.

[0101] Example 1:

[0102] The liquid crystal composition is composed of a first compound, a second compound, a third compound, a fourth compound, and an eighth compound. The mass fraction and performance parameters of each compound are shown in Table 1. The first compound is selected from the following compounds: The second compound is selected from the following compounds:

[0103]

[0104] The seventh compound is selected from The third compound is selected from the following compounds:

[0105] The fourth compound is selected from the following compounds:

[0106]

[0107] Table 1

[0108]

[0109] Example 2:

[0110] The liquid crystal composition is composed of a first compound, a second compound, a third compound, a fourth compound, and a fifth compound. The mass fraction and performance parameters of each compound are shown in Table 2. The first compound is selected from the following compounds: The second compound is selected from the following compounds:

[0111]

[0112] The third compound is selected from the following compounds: The fourth compound is selected from the following compounds: The fifth compound is selected from the following compounds:

[0113] Table 2

[0114]

[0115] Example 3:

[0116] The liquid crystal composition is composed of a first compound, a second compound, a third compound, a fourth compound, a seventh compound, and an eighth compound. The mass fraction and performance parameters of each compound are shown in Table 3. The first compound is selected from the following compounds: The second compound is selected from the following compounds:

[0117] The eighth compound is selected from: The third compound is selected from the following compounds: The fourth compound is selected from the following compounds: The seventh compound is selected from the following compounds:

[0118] Table 3

[0119]

[0120] Comparative Example 1:

[0121] The liquid crystal composition is composed of a first compound, a second compound, a fourth compound, and an eighth compound. The mass fraction and performance parameters of each compound are shown in Table 4. The first compound is selected from the following compounds: The second compound is selected from the following compounds:

[0122] The eighth compound is selected from: The fourth compound is selected from the following compounds:

[0123] Table 4

[0124]

[0125] Comparative Example 2:

[0126] The liquid crystal composition is composed of a first compound, a second compound, a third compound, a fourth compound, a seventh compound, and an eighth compound. The mass fraction and performance parameters of each compound are shown in Table 5. The first compound is selected from the following compounds: The second compound is selected from the following compounds: The eighth compound is selected from: The seventh compound is selected from the following compounds:

[0127] Table 5

[0128]

[0129] Comparative Example 3

[0130] The liquid crystal composition is composed of a first compound, a second compound, a fifth compound, and an eighth compound. The mass fraction and performance parameters of each compound are shown in Table 6. The first compound is selected from the following compounds: The second compound is selected from the following compounds:

[0131]

[0132] The eighth compound is selected from the following compounds: The fifth compound is selected from

[0133] Table 6

[0134]

[0135] Since the ratio of γ1 / K11 is positively correlated with the response time RT, the larger the ratio of γ1 / K11, the longer the response time. The embodiment of the present application is an experiment on a negative liquid crystal composition. In the present application, the negative liquid crystal composition must include a first compound and a second compound. It can be seen from the above-mentioned Example 1 and Control Example 1 that the γ1 / K11 value of the liquid crystal composition of Example 1 is less than the γ1 / K11 of the liquid crystal composition of Control Example 1. Then, the response time of the liquid crystal composition of Example 1 applied to the display panel is less than the response time of the liquid crystal composition of Control Example 1 applied to the display panel. The possible reason is that the liquid crystal composition provided in the embodiment of the present application includes a first compound, a second compound, a third compound and a fourth compound, which can improve the response time of the liquid crystal composition applied to the display panel as a whole.

[0136] According to the comparison between Examples 2-3 and Example 1, it can be seen that the γ1 / K11 values ​​of Examples 2-3 are all smaller than the γ1 / K11 values ​​of Example 1. Therefore, the response time of Examples 2-3 applied to the display panel is smaller than the response time of Example 1 applied to the display panel. The possible reason is that the liquid crystal composition of Example 2 further includes the sixth compound, and the liquid crystal composition of Example 3 further protects the seventh compound, which can further reduce the response time of the liquid crystal display panel.

[0137] Based on the above liquid crystal composition, an embodiment of the present invention further provides a display panel 100, such as Figure 1 As shown, the display panel 100 includes a first substrate 10, a second substrate 30, and a liquid crystal layer 20. The first substrate 10 and the second substrate 30 are disposed opposite each other, and the liquid crystal layer 20 is sandwiched between the first substrate 10 and the second substrate 30. The first substrate 10 may be a thin film transistor array substrate for driving the liquid crystal layer to emit light. The liquid crystal display panel also includes a color resist layer disposed on the side of the second substrate facing the first substrate to filter colors and achieve color display.

[0138] The material of the liquid crystal layer 20 includes the above-mentioned liquid crystal composition, and the material of the liquid crystal layer 20 may further include other components, such as a chiral agent, an initiator, a polymerization inhibitor, an organic solvent, and other additives.

[0139] Furthermore, the color resist layer includes a red color resist. The red pigment comprises a water-soluble pigment with a mass fraction of less than or equal to 1.5%, based on the total mass of the red pigment in the red color resist. 90% of the red pigment has a particle size of less than or equal to 100 nanometers. A smaller particle size of the red pigment in the red color resist facilitates more uniform distribution of the pigment and dye, thereby improving transmittance, reliability, and color gamut.

[0140] For high-contrast liquid crystal compositions, a second compound with a low Δn can be selected to effectively reduce the Δn of the composition, and the second, third, and fourth compounds can be used together to increase the elastic coefficient K value of the liquid crystal composition. The use of liquid crystal compounds with a high elastic coefficient is often accompanied by a high γ1, that is, a longer response time. By adding a first compound that can serve as a viscosity diluent, the viscosity of the liquid crystal can be effectively reduced, thereby reducing the response time. In addition, the response time of the liquid crystal composition can also be improved by reducing the cell thickness of the liquid crystal (the height of the support column PS in the liquid crystal layer, 1.5-3.2um). However, reducing the cell thickness is often accompanied by a loss of transmittance. Therefore, by combining it with the above-mentioned high-transmittance color resistance, the transmittance of the panel can be effectively increased.

[0141] For negative liquid crystal compositions, in order to reduce the response time of the negative liquid crystal composition, for example, to reduce the response time of the product from 30ms to 25ms, it is necessary to use a second compound with high Δn. Reducing the response time can be achieved by reducing the cell thickness, and reducing the transmittance of the cell thickness loss (PS height, 1.5-3.2um) can be compensated by increasing the Δn of the composition. Therefore, the selection of the second, third, and fourth compounds together can effectively improve the transmittance of the liquid crystal composition. The first compound can be used as a low-viscosity diluent and can be used to reduce the viscosity of the composition to reduce the response time. In addition, reducing the response time requires the use of high dielectric compounds (third compound, fourth compound) to complete.

[0142] The display panel can be used in electronic devices comprising the display panel and also including an earpiece, a camera, an optical fingerprint recognition device, etc. Such electronic devices include, but are not limited to, mobile phones, televisions, computers, tablets, watches, etc. The liquid crystal composition is suitable for electronic devices of various types, including VA, ECB, PALC, FFS, or IPS.

[0143] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] The above is a detailed introduction to a liquid crystal composition and a liquid crystal display panel provided in the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid crystal composition, characterized in that: include: At least one first compound represented by formula (I): At least one second compound represented by formula (II): At least one third compound represented by formula (III): as well as At least one fourth compound represented by formula (IV): wherein X is selected from O or S; n is an integer selected from 0 to 7; Z is selected from a single bond, -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O- or -C≡C-, or the following groups wherein at least one H is substituted or unsubstituted by F, Cl, Br or I: -CH2O-, -OCH2-, -CH2-CH2-, -(CH2)3- or -CH=CH-; Each independently selected from a single bond, or at least one H is substituted or unsubstituted by F, Cl, Br or I: and At least one of them is selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: Each is independently selected from a single bond, or the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: R1, R2, R3 and R4 are each independently selected from H, F, Cl, Br, I, CN, SCN, NCS, CF3 or SF5, or selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: alkyl groups of 1 to 15 carbon atoms, alkoxy groups of 1 to 15 carbon atoms, alkenyl groups of 2 to 15 carbon atoms, alkenyloxy groups of 2 to 15 carbon atoms, alkynyl groups of 2 to 15 carbon atoms, and alkynyloxy groups of 2 to 15 carbon atoms.

2. The liquid crystal composition according to claim 1, wherein The terminal groups of R1 and R2 are each independently selected from H, CN or CF3; And / or, at least one methylene group in R1 and at least one methylene group in R2 are each independently substituted by -O-, -S-, -SO2-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CF2O-, -OCF2-, -CH2O or -OCH2-, and the heteroatom is not directly bonded.

3. The liquid crystal composition according to claim 1, wherein Based on the total mass of the liquid crystal composition, the mass fraction of the first compound is 15% to 50%, and the mass fraction of the second compound is 1 to 60%.

4. The liquid crystal composition according to claim 3, wherein Based on the total mass of the liquid crystal composition, The mass fraction of the first compound is 20% to 45%; And / or, the mass fraction of the second compound is 3% to 55%; And / or, the mass fraction of the third compound is 1% to 25%; And / or, the mass fraction of the fourth compound is 1% to 25%.

5. The liquid crystal composition according to claim 1, wherein The second compound is selected from at least one compound represented by Formula II-1 to Formula II-51:

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one fifth compound represented by formula (V): wherein R5 and R6 are each independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

7. The liquid crystal composition according to claim 6, wherein Based on the total mass of the liquid crystal composition, the mass fraction of the fifth compound is 1% to 20%.

8. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one sixth compound represented by formula (VI): wherein R7 and R8 are each independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

9. The liquid crystal composition according to claim 8, characterized in that Based on the total mass of the liquid crystal composition, the mass fraction of the sixth compound is 1% to 15%.

10. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one seventh compound represented by formula (VII): Among them, R9 and R 10 Each is independently selected from the following groups in which at least one H is substituted or unsubstituted by F, Cl, Br or I: an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkenyloxy group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms or an alkynyloxy group having 2 to 10 carbon atoms.

11. The liquid crystal composition according to claim 10, characterized in that Based on the total mass of the liquid crystal composition, the mass fraction of the seventh compound is 1% to 15%.

12. A liquid crystal display panel, characterized in that: The invention comprises a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein the liquid crystal layer comprises the liquid crystal composition according to any one of claims 1 to 11.

13. The liquid crystal display panel according to claim 12, wherein: The liquid crystal display panel further includes a color resist layer, and the color resist layer is arranged on a side of the second substrate facing the first substrate; The color resist layer includes a red color resist, and the red pigment includes a water-soluble pigment with a mass fraction of less than or equal to 1.5% based on the total mass of the red pigment in the red color resist; 90% of the red pigments have a particle size less than or equal to 100 nanometers.

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