Liquid crystal composition and display panel

Abstract

The present application provides a liquid crystal composition and a display panel, the liquid crystal composition comprises at least one compound represented by formula (1), at least one compound represented by formula (2), at least one compound represented by formula (3), at least one compound represented by formula (4), at least one compound represented by formula (5), at least one compound represented by formula (6), and at least one compound represented by formula (7), the liquid crystal composition is obtained by designing the structure of liquid crystal molecules and combining liquid crystal molecules with different structures, experiments prove that the liquid crystal composition has low rotational viscosity, high dielectric anisotropy, high thermal stability and suitable optical anisotropy, so that the liquid crystal composition can be applied to the liquid crystal layer material of the display panel.

Description

TECHNICAL FIELD

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

[0002] Liquid crystal material is a mixture of organic rod-like small molecular compounds having fluidity of liquid and anisotropy of crystal at certain temperature, which is mainly used as dielectric in liquid crystal display because the optical performance of the material can be changed by applied voltage.

[0003] With the development of display technology, the performance requirements of liquid crystal display are getting higher and higher. In order to improve the display quality and reduce the power consumption, liquid crystal is required to achieve faster and faster response time and smaller driving voltage, especially for high refresh rate television products and gaming products, etc. The faster the response time, the better the picture experience. However, for liquid crystal material, reducing the viscosity of the liquid crystal material can accelerate the response time of the material, and improving the dielectric anisotropy of the liquid crystal material can reduce the power consumption of the display. However, it is difficult to ensure that other properties such as optical anisotropy and thermal stability are also at a relatively optimal level while reducing viscosity and improving dielectric anisotropy. SUMMARY

[0004] The present application provides a liquid crystal composition and a display panel, which has lower rotational viscosity, higher dielectric anisotropy, higher thermal stability and suitable optical anisotropy.

[0005] To solve the above problems, in a first aspect, the present application provides a liquid crystal composition, which comprises:

[0006] at least one compound represented by formula (1):

[0007]

[0008] at least one compound represented by formula (2):

[0009]

[0010] at least one compound represented by formula (3):

[0011]

[0012] at least one compound represented by formula (4):

[0013]

[0014] at least one compound represented by formula (5):

[0015]

[0016] at least one compound represented by formula (6):

[0017]

[0018] and at least one compound represented by formula (7):

[0019]

[0020] R1-R 13 are independently selected from alkyl, R 14 is selected from hydrogen, deuterium and alkyl, D is deuterated, n1, n2, n5, n6, n8, n 10 , n 13 , n 14 , n 16 and n 17 are independently selected from an integer from 1 to 10, n3, n4, n7 and n 11 are independently selected from an integer from 1 to 4, n9, n 12 , n 15 and n 18 are independently selected from an integer from 1 to 2.

[0021] In an embodiment of the present application, the compound represented by formula (1) is selected from the following:

[0022]

[0023] In an embodiment of the present application, the compound represented by formula (2) is selected from the following:

[0024]

[0025] In an embodiment of the present application, the compound represented by formula (3) is selected from the following:

[0026]

[0027]

[0028] In an embodiment of the present application, the compound represented by formula (4) is selected from the following:

[0029]

[0030]

[0031] In an embodiment of the present application, the compound represented by formula (5) is selected from the following:

[0032]

[0033]

[0034] In the liquid crystal composition provided by the embodiment of the present application, the compound represented by formula (6) is selected from the following:

[0035]

[0036]

[0037]

[0038] In the liquid crystal composition provided by the embodiment of the present application, the compound represented by formula (7) is selected from the following:

[0039]

[0040]

[0041] In the liquid crystal composition provided by the embodiment of the present application, the compound represented by formula (1) accounts for 20%-50% of the total mass of the liquid crystal composition, the compound represented by formula (2) accounts for 5%-20% of the total mass of the liquid crystal composition, the compound represented by formula (3) accounts for 1%-10% of the total mass of the liquid crystal composition, the compound represented by formula (4) accounts for 10%-30% of the total mass of the liquid crystal composition, the compound represented by formula (5) accounts for 10%-30% of the total mass of the liquid crystal composition, the compound represented by formula (6) accounts for 5%-20% of the total mass of the liquid crystal composition, and the compound represented by formula (7) accounts for 1%-10% of the total mass of the liquid crystal composition.

[0042] In a second aspect, the embodiment of the present application further provides a display panel, which comprises a first substrate and a second substrate arranged oppositely, and a liquid crystal layer arranged between the first substrate and the second substrate, wherein the liquid crystal layer comprises the liquid crystal composition described above.

[0043] Beneficial effects: the embodiment of the present application provides a liquid crystal composition and a display panel, the liquid crystal composition is obtained by designing the structure of liquid crystal molecules and combining liquid crystal molecules with different structures, and the liquid crystal composition has low rotational viscosity, high dielectric anisotropy, high thermal stability and suitable optical anisotropy, so that the liquid crystal composition can be applied to the liquid crystal layer material of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described below only show some of the embodiments of the present application, and any person skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0045] Figure 1 is a schematic diagram of a cross-sectional structure of a display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Any person skilled in the art can obtain all other embodiments based on the embodiments of the present application without any creative effort, which all belong to the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0048] In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, for purposes of explanation, specific details are set forth. It will be apparent to those skilled in the art that the present application can be practiced without using these specific details. In other instances, well-known structures and processes are not described in detail in order to avoid obscuring the description of the present application. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0049] The present application provides a liquid crystal composition, the liquid crystal composition comprising:

[0050] at least one compound represented by formula (1):

[0051]

[0052] at least one compound represented by formula (2):

[0053]

[0054] at least one compound represented by formula (3):

[0055]

[0056] at least one compound represented by formula (4):

[0057]

[0058] at least one compound represented by formula (5):

[0059]

[0060] at least one compound represented by formula (6):

[0061]

[0062] and at least one compound represented by formula (7):

[0063]

[0064] wherein, R1-R 13 are independently selected from alkyl, R 14 is selected from hydrogen, deuterium and alkyl, D is deuterated, n1, n2, n5-n8, n 10 , n 13 , n 14 , n 16 and n 17 are independently selected from an integer of 1-10, n3, n4 and n 11 are independently selected from an integer of 1-4, n9, n 12 , n 15 , n 16 and n 18 are independently selected from an integer of 1-2.

[0065] In the liquid crystal composition provided by the embodiment of the present application, the liquid crystal composition is obtained by designing the structure of the liquid crystal molecules and combining the liquid crystal molecules with different structures in a proper manner. It is verified by experiments that the liquid crystal composition has low rotational viscosity, high dielectric anisotropy, high thermal stability and suitable optical anisotropy. The specific experimental data are described in the following embodiments. In particular, in the liquid crystal composition provided by the embodiment of the present application, the hydrogen at a specific position on the carbon skeleton of each liquid crystal molecule is replaced by deuterium, and then the liquid crystal molecules with different structures are combined in a specific manner to endow the liquid crystal composition with better performance.

[0066] It is further explained that, in the liquid crystal composition provided by the embodiment of the present application, the compounds represented by formulae (1)-(3) are neutral liquid crystal molecules, which are used to balance the dielectric anisotropy and the optical anisotropy of the liquid crystal composition, improve the clearing point and reduce the rotational viscosity. The compounds represented by formulae (4)-(7) are negative liquid crystal molecules, which are used to provide suitable dielectric anisotropy for the liquid crystal composition. In addition, the compound represented by formula (7) contains a carbon-carbon double bond, which is further used to reduce the rotational viscosity and the elastic bending constant of the liquid crystal composition. By reasonably combining the liquid crystal molecules of the above types, the obtained liquid crystal composition has better performance.

[0067] In some embodiments, formula (1) is specifically as follows:

[0068]

[0069] In some embodiments, formula (2) is specifically as follows:

[0070]

[0071] In some embodiments, formula (3) is specifically as follows:

[0072]

[0073] In some embodiments, formula (4) is specifically as follows:

[0074]

[0075] In some embodiments, formula (5) is specifically as follows:

[0076]

[0077] In some embodiments, formula (6) is specifically as follows:

[0078]

[0079] In some embodiments, formula (7) is specifically the following structural formula:

[0080]

[0081] In some embodiments, R1-R 13 are independently selected from linear alkyl groups having 1 to 5 carbon atoms, R 14 is selected from hydrogen, deuterium, and linear alkyl groups having 1 to 5 carbon atoms.

[0082] In some embodiments, the compound represented by formula (1) is selected from the following:

[0083]

[0084] In some embodiments, the compound represented by formula (2) is selected from the following:

[0085]

[0086]

[0087] In some embodiments, the compound represented by formula (3) is selected from the following:

[0088]

[0089]

[0090] In some embodiments, the compound represented by formula (4) is selected from the following:

[0091]

[0092]

[0093] In some embodiments, the compound represented by formula (5) is selected from the following:

[0094]

[0095]

[0096] In some embodiments, the compound represented by formula (6) is selected from the following:

[0097]

[0098]

[0099] In some embodiments, the compound represented by formula (7) is selected from the following:

[0100]

[0101]

[0102]

[0103] In some embodiments, the compound represented by formula (1) comprises 20-50% of the total mass of the liquid crystal composition, the compound represented by formula (2) comprises 5-20% of the total mass of the liquid crystal composition, the compound represented by formula (3) comprises 1-10% of the total mass of the liquid crystal composition, the compound represented by formula (4) comprises 10-30% of the total mass of the liquid crystal composition, the compound represented by formula (5) comprises 10-30% of the total mass of the liquid crystal composition, the compound represented by formula (6) comprises 5-20% of the total mass of the liquid crystal composition, and the compound represented by formula (7) comprises 1-10% of the total mass of the liquid crystal composition.

[0104] In some embodiments, the compound represented by formula (1) comprises 25-40% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (1) comprises 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, or 39% of the total mass of the liquid crystal composition.

[0105] In some embodiments, the compound represented by formula (2) comprises 10-20% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (2) comprises 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19% of the total mass of the liquid crystal composition.

[0106] In some embodiments, the compound represented by formula (3) comprises 5-10% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (3) comprises 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9% of the total mass of the liquid crystal composition.

[0107] In some embodiments, the compound represented by formula (4) comprises 10-20% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (4) comprises 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19% of the total mass of the liquid crystal composition.

[0108] In some embodiments, the compound represented by formula (5) comprises 10-20% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (5) comprises 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or 19% of the total mass of the liquid crystal composition.

[0109] In some embodiments, the compound represented by formula (6) comprises 7% to 15% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (6) comprises 8%, 9%, 10%, 11%, 12%, 13%, or 14% of the total mass of the liquid crystal composition.

[0110] In some embodiments, the compound represented by formula (7) comprises 2% to 10% of the total mass of the liquid crystal composition, illustratively, the compound represented by formula (7) comprises 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9% of the total mass of the liquid crystal composition.

[0111] The liquid crystal composition provided by the present application is described in detail below in connection with specific examples, wherein each component used in the following examples can be synthesized by methods known in the art or obtained by commercial means:

[0112] The synthesis steps of a compound are shown illustratively as follows, and other compounds can be synthesized according to the following steps by selecting corresponding raw materials:

[0113] Step 1: SO3-O2O→O2SO4;

[0114] Step 2:

[0115] wherein SO3, D2O, and are obtained directly by commercial means.

[0116] The liquid crystal compositions are prepared according to the mixing ratio of each component specified in the following examples. The preparation of the liquid crystal compositions is performed according to conventional methods in the art, such as mixing according to the specified ratio by heating, ultrasonic, suspension, etc.

[0117] The liquid crystal compositions given in the following examples are prepared and studied, and the composition of each liquid crystal composition and the test results of its performance parameters are shown below.

[0118] Example 1

[0119] The following compounds are provided:

[0120]

[0121] The liquid crystal composition 1 is prepared by mixing each compound and mass percentage content as shown in Table 1 below:

[0122] Table 1

[0123] Compound A1 A2 A3 A4 A5 A6 Content / wt% 23.8 12.8 12.8 5.8 4.7 12.9 Compound A7 A8 A9 A10 A11 Content / wt% 6.5 6.6 8.2 3.5 2.4

[0124] Example 2

[0125] Liquid crystal composition 2 was prepared by mixing each compound and mass percentage as shown in Table 2 below:

[0126] Table 2

[0127] Compound A1 A2 A3 A4 A5 A6 Content / wt% 30.6 12.8 6 5.8 4.7 12.9 Compound A7 A8 A9 A10 A11 Content / wt% 6.5 6.6 8.2 3.5 2.4

[0128] Example 3

[0129] Liquid crystal composition 3 was prepared by mixing each compound and mass percentage as shown in Table 3 below:

[0130] Table 3

[0131] Compound A1 A2 A4 A5 A6 Content / wt% 36.6 12.8 5.8 4.7 12.9 Compound A7 A8 A9 A10 A11 Content / wt% 6.5 6.6 8.2 3.5 2.4

[0132] Example 4

[0133] Liquid crystal composition 4 was prepared by mixing each compound and mass percentage as shown in Table 4 below:

[0134] Table 4

[0135] Compound A1 A2 A3 A4 A5 A6 Content / wt% 18.6 8 18.8 9.8 4.7 10.9 Compound A7 A8 A9 A10 A11 Content / wt% 5.5 5.6 5.2 3.5 9.4

[0136] Comparative Example 1

[0137] The following compounds were provided:

[0138]

[0139]

[0140] Liquid crystal composition 5 was prepared by mixing each compound and mass percentage as shown in Table 5 below:

[0141] Table 5

[0142] Compound B1 B2 B3 B4 B5 B6 Content / wt% 23.8 12.8 12.8 5.8 4.7 12.9 Compound B7 B8 B9 B10 B11 Content / wt% 6.5 6.6 8.2 3.5 2.4

[0143] The liquid crystal compositions 1-5 described above were tested for performance parameters, and the test results are shown in Table 6 below:

[0144] Table 6

[0145]

[0146] Wherein Δε is the dielectric constant, which is the difference between the dielectric constant parallel to the molecular axis and the dielectric constant perpendicular to the molecular axis measured at 25℃, 1Hz; Δn is the optical anisotropy, which is the difference between the ordinary light refractive index and the extraordinary light refractive index measured at 25℃ using a sodium light lamp (589nm); Tni is the clearing point, which is the temperature of the nematic to isotropic transition; γ1 is the rotational viscosity.

[0147] From the above data, compared with the liquid crystal composition provided by the comparative example, the liquid crystal composition provided by the embodiment of the present application has lower rotational viscosity and greater absolute value of negative dielectric constant, that is, has higher dielectric anisotropy, while the clearing point and optical anisotropy are comparable, that is, the thermal stability and optical performance do not deteriorate. In particular, since the content of compound A11 in the liquid crystal composition provided by Example 4 is higher than that in Examples 1-3, the liquid crystal composition provided by Example 4 has lower rotational viscosity.

[0148] The embodiment of the present application also provides a display panel, and a cross-sectional structure thereof is shown in Figure 1 The display panel includes a first substrate 100 and a second substrate 200 arranged oppositely, and a liquid crystal layer 300 sandwiched between the first substrate 100 and the second substrate 200, wherein the liquid crystal layer 300 includes the liquid crystal composition provided in the foregoing embodiment. On the one hand, since the liquid crystal composition has greater dielectric anisotropy, the display panel can have lower driving voltage, thereby reducing the power consumption of the display panel. On the other hand, the liquid crystal composition has lower rotational viscosity, so that the display panel can have faster response time, and is suitable for high refresh rate display equipment.

[0149] Among them, usually, one of the first substrate 100 and the second substrate 200 is an array substrate, and the other is a color filter substrate.

[0150] The above describes in detail the liquid crystal composition and the display panel provided by the embodiment of the present application. In this paper, specific examples are applied to explain the principles and implementation modes of the present application. The above embodiment 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 mode and application range will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A liquid crystal composition, characterized by comprising The liquid crystal composition comprises: at least one compound represented by formula (1): at least one compound represented by formula (2): at least one compound represented by formula (3): at least one compound represented by formula (4): at least one compound represented by formula (5): at least one compound represented by formula (6): and at least one compound represented by formula (7): wherein R1-R 13 are independently selected from alkyl, R 14 is selected from hydrogen, deuterium and alkyl, D is deuterated, n1, n2, n5, n6, n8, n 10 , n 13 , n 14 , n 16 and n 17 are independently selected from an integer from 1 to 10, n3, n4, n7 and n 11 are independently selected from an integer from 1 to 4, n9, n 12 , n 15 and n 18 are independently selected from an integer from 1 to 2; The compound represented by formula (1) accounts for 25%-40% of the total mass of the liquid crystal composition, the compound represented by formula (2) accounts for 5%-20% of the total mass of the liquid crystal composition, the compound represented by formula (3) accounts for 1%-10% of the total mass of the liquid crystal composition, the compound represented by formula (4) accounts for 10%-30% of the total mass of the liquid crystal composition, the compound represented by formula (5) accounts for 10%-30% of the total mass of the liquid crystal composition, the compound represented by formula (6) accounts for 5%-20% of the total mass of the liquid crystal composition, and the compound represented by formula (7) accounts for 2%-10% of the total mass of the liquid crystal composition.

2. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (1) is selected from the following:

3. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (2) is selected from the following:

4. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (3) is selected from the following:

5. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (4) is selected from the following:

6. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (5) is selected from the following:

7. The liquid crystal composition according to claim 1, wherein The compound represented by formula (6) is selected from the following:

8. The liquid crystal composition according to claim 1, characterized by The compound represented by formula (7) is selected from the following:

9. A display panel, characterized by, The display panel comprises a first substrate and a second substrate arranged oppositely and a liquid crystal layer sandwiched between the first substrate and the second substrate, and the liquid crystal layer comprises the liquid crystal composition according to any one of claims 1-8.

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