Liquid crystal composition and liquid crystal display panel

Abstract

The invention relates to a liquid crystal composition and a liquid crystal display panel, the liquid crystal composition comprises a liquid crystal material and a self-alignment additive, and the self-alignment additive comprises at least one of compounds represented by a formula I, and the liquid crystal material comprises at least one of compounds shown as a formula II: # imgabs0 #. According to the invention, the vertical alignment of the liquid crystal material can be realized under the condition that a polyimide alignment layer is not needed, so that the manufacturing process of the liquid crystal display panel is simplified.

Description

Technical Field

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

[0002] Liquid crystal materials are widely used in various display devices such as mobile phones, televisions and computers. Liquid crystal plays the role of a "light valve" in thin film transistor liquid crystal displays (TFT-LCDs), which adjusts the brightness of display devices by controlling the amount of backlight transmitted.

[0003] The traditional vertical alignment (VA) liquid crystal display device consists of a TFT substrate, a color filter (CF) substrate, a polyimide (PI) alignment layer and a liquid crystal composition sandwiched between the two substrates. The liquid crystal molecules in the liquid crystal composition are vertically aligned through the PI alignment layer. When the external voltage is 0V, the long axis direction of the liquid crystal molecules in the VA mode display is perpendicular to the glass substrate; after the natural light passes through the polarizer on the TFT substrate side, it forms linear polarized light. At this time, its polarization state and polarization direction cannot be changed by the liquid crystal molecules, and thus it is absorbed by the polarizer on the CF substrate side, that is, the incident light perpendicular to the glass substrate cannot pass through, and the display presents a dark state effect. Therefore, VA mode display devices usually have negative dielectric anisotropy (Δε) and high contrast.

[0004] In order to improve the assembly process of liquid crystal displays, it is necessary to develop liquid crystal materials suitable for reducing process technology. Summary of the invention

[0005] The embodiments of the present application provide a liquid crystal composition and a liquid crystal display panel. The self-alignment additive in the liquid crystal composition can achieve vertical alignment of the liquid crystal material without the need for a polyimide alignment layer, thereby simplifying the manufacturing process of the liquid crystal display panel.

[0006] In order to achieve the above object, according to the first aspect of the present application, a liquid crystal composition is provided, comprising a liquid crystal material and a self-alignment additive, wherein the self-alignment additive comprises at least one of the compounds represented by formula I, and the liquid crystal material comprises at least one of the compounds represented by formula II:

[0007]

[0008] Wherein, R1 is selected from -H, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, and an aromatic ring having 3-10 carbon atoms; any one or multiple non-adjacent -CH2- in the R1 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in the R1 group is not substituted or is substituted by one of F, Cl, Br, and I;

[0009] Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of F, Cl, Br and I;

[0010] X is selected from a single bond, -O- or -S-;

[0011] L is selected from -H, -F, -Cl, -CF3, -Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, an aromatic ring having 3-10 carbon atoms, any one or more non-adjacent -CH2- in the L group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the L group is not substituted or is substituted by one of F, Cl, Br and I;

[0012] Selected from in, Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0013] Selected from

[0014] The H on the benzene ring of the compound represented by the formula I is not substituted or is substituted by -F, -Cl, -Br, -CN, -SCN, -NCS, 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;

[0015] R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl ...oxy groups having 2 to 10 carbon atoms, the terminal groups of R2 and R3 are unsubstituted or substituted with -CN or -CF3, and R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 1 One or more -CH2- in the 3 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, and one or more H in the R2 and R3 groups is not substituted or is substituted by one of F, Cl, Br and I;

[0016] n is selected from 1, 2 or 3;

[0017] a and b are selected from 0, 1, 2 or 3, and a+b≥1;

[0018] c, d, p and q are selected from 0, 1 or 2;

[0019] Sp is selected from an ether group, an alkyl group, an alkoxy group or a polymerizable group, and at least one Sp in the formula I is selected from a polymerizable group;

[0020] T represents a group containing a hydroxyl group.

[0021] According to a second aspect of the present application, a liquid crystal display panel is provided, comprising a first substrate and a second substrate arranged relative to each other, a self-alignment layer arranged at least on a side of the first substrate close to the second substrate, and a liquid crystal layer arranged between the self-alignment layer and the second substrate, wherein the self-alignment layer is formed by polymerization of the self-alignment additive in the liquid crystal composition described above.

[0022] In the liquid crystal composition and liquid crystal display panel of the embodiments of the present application, the liquid crystal composition contains a self-alignment additive represented by Formula I. When the liquid crystal composition is arranged between two substrates, the anchor group T on the benzene ring in the self-alignment additive can be anchored to the surface of at least one substrate; and, under ultraviolet light irradiation, the polymerizable group Sp in the self-alignment additive can undergo a polymerization reaction to form a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment additive acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate, thereby realizing the self-alignment function.

[0023] The rigid chain group in the self-aligning additive is composed of cyclic groups A and B, a central group located between the cyclic groups A and B, and a and terminal groups The cooperation of multiple different cyclic groups can extend the length of the rigid chain group, which is beneficial to improve the alignment ability of the self-alignment additive on the liquid crystal material. When X in is selected from -O- or -S-, the angle formation rate of the liquid crystal composition in the first ultraviolet irradiation process (UV1) can be slowed down, thereby facilitating the improvement of alignment uniformity. Therefore, the self-aligning additive provided in the present application has good self-aligning ability.

[0024] In addition, the liquid crystal material in the liquid crystal composition includes a liquid crystal compound represented by Formula II, which is a neutral single crystal and has the characteristics of low viscosity, which can reduce the response time of the liquid crystal composition and is beneficial to improving the response speed of the liquid crystal composition.

[0025] Therefore, the present application adopts the above-mentioned liquid crystal composition, which can improve the response speed of the liquid crystal composition while eliminating the traditional polyimide alignment film process, thereby simplifying the process of the liquid crystal display panel while ensuring the liquid crystal alignment effect and response speed, which is beneficial to saving materials and production costs and shortening the production time of the liquid crystal display panel.

[0026] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0028] Figure 1 A schematic diagram of a liquid crystal display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0030] An embodiment of the present application provides a liquid crystal composition, which includes a liquid crystal material and a self-alignment additive, wherein the self-alignment additive includes at least one of the compounds represented by Formula I, and the liquid crystal material includes at least one of the compounds represented by Formula II:

[0031]

[0032] Wherein, R1 is selected from -H, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, and an aromatic ring having 3-10 carbon atoms; any one or multiple non-adjacent -CH2- in the R1 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in the R1 group is not substituted or is substituted by one of F, Cl, Br, and I;

[0033] Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of F, Cl, Br and I;

[0034] X is selected from a single bond, -O- or -S-;

[0035] L is selected from -H, -F, -Cl, -CF3, -Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, an aromatic ring having 3-10 carbon atoms, any one or more non-adjacent -CH2- in the L group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the L group is not substituted or is substituted by one of F, Cl, Br and I;

[0036] Selected from in, Any non-adjacent -CH2- in is unsubstituted or substituted with -O-;

[0037] Selected from

[0038] The -H on the benzene ring of the compound represented by the formula I is not substituted or is substituted by -F, -Cl, -Br, -CN, -SCN, -NCS, 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;

[0039] R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl ...oxy groups having 2 to 10 carbon atoms, the terminal groups of R2 and R3 are unsubstituted or substituted with -CN or -CF3, and R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 1 One or more -CH2- in the 3 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, and one or more H in the R2 and R3 groups is not substituted or is substituted by one of F, Cl, Br and I;

[0040] n is selected from 1, 2 or 3;

[0041] a and b are selected from 0, 1, 2 or 3, and a+b≥1;

[0042] c, d, p and q are selected from 0, 1 or 2;

[0043] Sp is selected from an ether group, an alkyl group, an alkoxy group or a polymerizable group, and at least one Sp in the formula I is selected from a polymerizable group;

[0044] T represents a group containing a hydroxyl group.

[0045] It should be noted that the polymerizable group mentioned above refers to a group containing an unsaturated group such as a carbon-carbon double bond or a carbon-carbon triple bond.

[0046] Specifically, the liquid crystal compound represented by Formula II is a neutral single crystal and has a small rotational viscosity (γ1), which can improve the response speed of the liquid crystal composition. When the liquid crystal composition is applied to a liquid crystal display panel, it can eliminate the tailing or afterimage phenomenon when the liquid crystal display panel switches the screen, thereby improving the user experience.

[0047] Specifically, the liquid crystal material in the liquid crystal composition provided in the embodiments of the present application has negative dielectric anisotropy and can be applied to liquid crystal displays of modes such as VA (Vertical Alignment), PSA (Polymer Sustained Alignment), PS-VA (Polymer Stabilized Vertical Alignment), PVA (Patterned Vertical Alignment) or MVA (Multi-domain Vertical Alignment).

[0048] It is understandable that technicians in this technical field can select and adjust the composition of the liquid crystal material as needed, so that the liquid crystal composition has advantages such as negative dielectric anisotropy, higher stability, faster response speed, and higher transmittance.

[0049] Specifically, when the liquid crystal composition provided in the embodiments of the present application is disposed between two substrates, the anchoring group T on the benzene ring in the self-alignment additive can be anchored to the surface of at least one substrate; and, under ultraviolet light irradiation, the polymerizable group Sp in the self-alignment additive can undergo a polymerization reaction to form a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment additive acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate, thereby realizing the self-alignment function.

[0050] The rigid chain group in the self-aligning additive is composed of cyclic groups A and B, a central group located between the cyclic groups A and B, and a and terminal groups The cooperation of multiple different cyclic groups can extend the length of the rigid chain group, which is beneficial to improve the alignment ability of the self-alignment additive on the liquid crystal material. When X in is selected from -O- or -S-, the angle formation rate of the liquid crystal composition in the first ultraviolet irradiation process (UV1) can be slowed down, thereby facilitating the improvement of alignment uniformity. Therefore, the self-aligning additive provided in the present application has good self-aligning ability.

[0051] In addition, the liquid crystal material in the liquid crystal composition includes a liquid crystal compound represented by Formula II, which is a neutral single crystal and has the characteristics of low viscosity, which can reduce the response time of the liquid crystal composition and is beneficial to improving the response speed of the liquid crystal composition.

[0052] Therefore, the present application adopts the above-mentioned liquid crystal composition, which can improve the response speed of the liquid crystal composition while eliminating the traditional polyimide alignment film process, thereby simplifying the process of the liquid crystal display panel while ensuring the liquid crystal alignment effect and response speed, which is beneficial to saving materials and production costs and shortening the production time of the liquid crystal display panel.

[0053] In one embodiment, n is selected from 1 or 2.

[0054] In one embodiment, a and b are selected from 0, 1 or 2, and a+b≥1.

[0055] In one embodiment, c and d are selected from 0 or 1.

[0056] In one embodiment, p and q are selected from 0 or 1.

[0057] Specifically, in the self-alignment additive represented by Formula I, the number of cyclic groups increases, so that the length of the rigid chain group increases, which is beneficial to improving the alignment ability of the self-alignment additive to the liquid crystal. However, when the length of the rigid chain group is too long, the solubility of the self-alignment additive in the liquid crystal composition will deteriorate. Therefore, the embodiment of the present application can improve the solubility of the self-alignment additive in the liquid crystal composition by changing the number and type of the substituent group and the benzene ring group; and by enriching the combination form of the self-alignment additive, the total amount of the self-alignment additive added in the liquid crystal composition is increased, which is beneficial to improving the alignment ability of the self-alignment additive to the liquid crystal material.

[0058] In some embodiments, the self-aligning additive is selected from at least one of the compounds represented by Formula I-1 to Formula I-28:

[0059]

[0060]

[0061] In some embodiments, in the compounds represented by Formula I-1 to Formula I-28, n is selected from 1 or 2, and a and b are selected from 1 or 2.

[0062] In some embodiments, the group T in the formula I is selected from at least one of the groups represented by formula III:

[0063]

[0064] Wherein, R4, R5 and R6 are selected from -H, -OH, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, and alkynyloxy groups having 2 to 10 carbon atoms. The terminal groups of R4, R5 and R6 are not substituted or are substituted with -OH, -CN or -CF3. One or more -CH2- are not substituted or are substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, one or more H in the R4, R5 and R6 groups are not substituted or are substituted by one of F, Cl, Br and I, and the terminal group of at least one of the R4, R5 and R6 groups is a hydroxyl group;

[0065] k is selected from any integer between 0 and 10;

[0066] Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms. Any non-adjacent -CH2- in the Z4 group is not substituted or replaced by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-. One or more H in the Z4 group is not substituted or replaced by one of F, Cl, Br and I.

[0067] It should be noted that the group T represented by formula III is an anchoring group, and at least one terminal group among the R4, R5 and R6 groups is a hydroxyl group (-OH), which can form a hydrogen bond with the substrate surface of the liquid crystal display panel, thereby playing an anchoring role.

[0068] In some embodiments, the Sp group in Formula I is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, a group represented by Formula IV or Formula V, and at least one Sp group is selected from a group represented by Formula IV or Formula V:

[0069]

[0070] Wherein, m is selected from any integer between 0 and 10;

[0071] Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms. Any non-adjacent -CH2- in the Z5 group is not substituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-. One or more H in the Z5 group is not substituted or substituted by one of F, Cl, Br and I.

[0072] It can be understood that the chemical structural formulas of the Sp groups at different positions in the compound represented by Formula I may be different, and at least one Sp group is a polymerizable group.

[0073] Specifically, under ultraviolet (UV) irradiation, the polymerizable groups Sp may undergo polymerization reaction with each other, thereby forming a polymer layer on the surface of the substrate.

[0074] Of course, in other embodiments, the liquid crystal composition provided in the embodiments of the present application may also include a polymerizable compound or a polymer containing a polymerized form thereof, so that under ultraviolet light (UV) irradiation, the polymerizable groups in the self-alignment additive react with the polymerizable groups in the polymerizable compound to form a polymer layer on the surface of the substrate.

[0075] In some embodiments, the polymerizable compound includes a compound represented by Formula VI:

[0076]

[0077] It should be noted that the polymerizable compounds in the embodiments of the present application are not limited to the compounds represented by formula VI, and other polymerizable compounds that can undergo polymerization reaction with the polymerizable group Sp in the self-alignment additive to form a polymer layer are also within the scope of protection of the present application. It can be understood that the polymerization reaction of the polymerizable group Sp can be an addition reaction occurring on at least one carbon-carbon double bond at both ends of the compound represented by formula VI, but is not limited thereto.

[0078] In some embodiments, the self-aligning additive is selected from at least one of the compounds represented by Formula I-1-1 to Formula I-28-4:

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087] In a specific embodiment, the self-aligning additive is selected from at least one of the compounds represented by formula I-6-1-1, formula I-6-4-1 and formula I-11-2-1:

[0088]

[0089] Specifically, the self-aligning additive represented by formula I-6-1 provided in the examples of the present application can be prepared according to synthesis route 1.

[0090]

[0091] When the self-aligning additive of formula I-6-1-1 is prepared by using synthetic route 1, the R1 group represents H. In addition, the prepared product is subjected to high-resolution mass spectrometry test, [M+H] + =707.4, confirmed to be the target product represented by formula I-6-1-1.

[0092] Specifically, the self-aligning additive represented by formula I-6-4 provided in the examples of the present application can be prepared according to synthesis route 2.

[0093] When the self-aligning additive shown in formula I-6-4-1 is prepared by using synthetic route 2, the R1 group represents H. In addition, the prepared product is subjected to high-resolution mass spectrometry test, [M+H] + =623.3, confirmed to be the target product represented by formula I-6-4-1.

[0094] Specifically, the self-aligning additive represented by formula I-11-2 provided in the examples of the present application can be prepared according to synthesis route 3.

[0095]

[0096] When the self-aligning additive of formula I-11-2-1 is prepared by using synthetic route 3, the R1 group represents H. In addition, the prepared product is subjected to high-resolution mass spectrometry test, [M+H] + =825.4, confirmed to be the target product represented by formula I-11-2-1.

[0097] It can be understood that the self-aligning additives of formula I provided in the examples of the present application can be prepared by referring to the above-mentioned synthesis route, and it is only necessary to adjust the reactants adaptively according to different target products.

[0098] Specifically, the mass percentage of the self-alignment additive in the liquid crystal composition ranges from 0.01% to 1.50%. For example, the mass percentage of the self-alignment additive in the liquid crystal composition can be 0.01%, 0.05%, 0.2%, 1.2% or 1.50%, but is not limited thereto.

[0099] Specifically, the mass percentage of the liquid crystal compound represented by Formula II in the liquid crystal composition ranges from 5% to 70%. For example, the mass percentage of the liquid crystal compound represented by Formula II in the liquid crystal composition may be 5%, 10%, 20%, 30%, 40%, 50%, 60% or 70%, but is not limited thereto.

[0100] In the embodiment of the present application, the liquid crystal composition contains a self-alignment additive represented by Formula I. When the liquid crystal composition is arranged between two substrates, the anchor group T on the benzene ring in the self-alignment additive can be anchored to the surface of at least one substrate; and, under ultraviolet light irradiation, the polymerizable group Sp in the self-alignment additive can undergo a polymerization reaction to form a polymer layer on the surface of the substrate; at the same time, the rigid chain group in the self-alignment additive acts as a steric obstacle perpendicular to the substrate surface, thereby guiding the liquid crystal molecules to align perpendicularly to the substrate, thereby realizing the self-alignment function.

[0101] The rigid chain group in the self-aligning additive is composed of cyclic groups A and B, a central group located between the cyclic groups A and B, and a and terminal groups The cooperation of multiple different cyclic groups can extend the length of the rigid chain group, which is beneficial to improve the alignment ability of the self-alignment additive on the liquid crystal material. When X in is selected from -O- or -S-, the angle formation rate of the liquid crystal composition in the first ultraviolet irradiation process (UV1) can be slowed down, thereby facilitating the improvement of alignment uniformity. Therefore, the self-aligning additive provided in the embodiment of the present application has good self-aligning ability.

[0102] In addition, the liquid crystal material in the liquid crystal composition includes a liquid crystal compound represented by Formula II, which is a neutral single crystal and has the characteristics of low viscosity, which can reduce the response time of the liquid crystal composition and is beneficial to improving the response speed of the liquid crystal composition.

[0103] Therefore, the embodiment of the present application adopts the above-mentioned liquid crystal composition, which can improve the response speed of the liquid crystal composition while eliminating the traditional polyimide alignment film process, thereby simplifying the process of the liquid crystal display panel while ensuring the liquid crystal alignment effect and response speed, which is beneficial to saving materials and production costs and shortening the production time of the liquid crystal display panel.

[0104] The embodiments of the present application also provide a method for preparing a liquid crystal composition, wherein the liquid crystal composition comprises the liquid crystal material described in the above embodiments and a self-alignment additive; the preparation process of the liquid crystal composition comprises the following steps:

[0105] (1) Weighing and mixing the liquid crystal compounds according to a preset weight percentage;

[0106] (2) heating and stirring the mixture of liquid crystal compounds at a temperature of 60° C. to 100° C., and at the same time, adding the self-alignment additive to the mixture of liquid crystal compounds according to a preset weight percentage, and mixing them uniformly;

[0107] (3) Cooling the mixed solution to room temperature and encapsulating to obtain the target liquid crystal composition.

[0108] It can be understood that the liquid crystal composition provided in the embodiments of the present application is prepared by a thermal dissolution method, which is simple and easy to implement.

[0109] It should be noted that when weighing a plurality of liquid crystal compounds, there is no requirement for the weighing order; usually, the liquid crystal compounds can be weighed and mixed at once in the order of their melting points from low to high.

[0110] Specifically, the mixture of liquid crystal compounds may be heated at 60° C., 70° C., 80° C., 90° C. or 100° C.

[0111] It is understood that the self-aligning additive is added during the heating and stirring process of the mixture of liquid crystal compounds.

[0112] Specifically, after the target liquid crystal composition is prepared, the clearing point (Tni, unit: °C), the optical anisotropy (Δn) at 25 °C, and the refractive index of extraordinary light (n e ), rotational viscosity at 25°C (γ1, unit: mPa·s), dielectric anisotropy at 25°C (Δε), dielectric constant perpendicular to the long axis of the liquid crystal molecule (ε ⊥ ), splay elastic constant K 11 and the bending elastic constant K 33 The characteristic parameters such as dielectric anisotropy and vertical self-alignment are measured and analyzed to determine whether the liquid crystal composition has the characteristics of negative dielectric anisotropy and vertical self-alignment.

[0113] The liquid crystal composition provided in this application is explained in detail below with specific examples.

[0114] Embodiment 1

[0115] As shown in Table 1, Example 1 of the present application provides a liquid crystal composition, which includes a liquid crystal material composed of a plurality of liquid crystal compounds, a polymerizable compound and a self-alignment additive.

[0116] Table 1 Component distribution and performance parameters of the liquid crystal composition of Example 1

[0117]

[0118] As can be seen from Table 1, the first four compounds in the table are liquid crystal compounds represented by Formula II, the last compound in the table is a self-aligning additive represented by Formula I-6-1-1, the thirteenth compound in the table is a polymerizable compound represented by Formula VI, and the fifth to twelfth compounds in the table are other types of liquid crystal compounds. It can be understood that the liquid crystal material in the liquid crystal composition provided in Example 1 is composed of the first twelve compounds in Table 1.

[0119] Specifically, in the liquid crystal composition provided in Example 1, the weight percentage of the self-alignment additive represented by Formula Ⅰ-6-1-1 is 0.6%, the weight percentage of the liquid crystal compound represented by Formula Ⅱ is 37%, and the weight percentage of the polymerizable compound represented by Formula VI is 0.3%.

[0120] It should be noted that the weight percentage of each liquid crystal compound in Table 1 is relative to the weight percentage of the liquid crystal material being 100%, and the weight percentage of the self-alignment additive and the polymerizable compound in Table 1 is relative to the weight percentage of the liquid crystal composition being 100%. In other words, the weight percentage of the self-alignment additive and the polymerizable compound in Table 1 is relative to the weight percentage of the liquid crystal material being 99.1%.

[0121] Specifically, the performance parameters of the liquid crystal composition provided in Example 1 are shown in Table 1. It can be seen that the liquid crystal composition has a relatively high clearing point temperature (Tni), and no crystallization occurs under extremely low temperature conditions, indicating that the liquid crystal composition has good stability; and the liquid crystal composition has a negative dielectric anisotropy (Δε is less than 0), and the absolute value of Δε (|Δε|) is relatively large, which can further improve the response speed of the liquid crystal composition; in addition, the bending elastic constant K of the liquid crystal composition is 33 The larger the value, the better it is for reducing the response time of the liquid crystal composition, thereby accelerating the response speed of the liquid crystal composition; in addition, the liquid crystal composition has a larger optical anisotropy (Δn), thereby increasing the transmittance of the liquid crystal display panel and improving the viewing angle of the liquid crystal display panel.

[0122] More importantly, the liquid crystal composition provided in Example 1 was introduced into a test box without a polyimide alignment layer for testing, and it was found that the liquid crystal composition had the characteristics of spontaneous vertical alignment relative to the substrate surface, and the alignment could remain stable until the clearing point. When a certain voltage was applied to the test box and UV light was irradiated, the liquid crystal composition in the test box formed a certain pre-tilt angle; and by applying a voltage at both ends of the test box, the liquid crystal box could achieve reversible switching of light transmittance.

[0123] Embodiment 2

[0124] As shown in Table 2, Example 2 of the present application provides another liquid crystal composition, which includes a liquid crystal material composed of a plurality of liquid crystal compounds, a polymerizable compound and a self-alignment additive.

[0125] As can be seen from Table 2, the first three compounds in the table are liquid crystal compounds represented by Formula II, the last compound in the table is a self-aligning additive represented by Formula I-11-2-1, the thirteenth compound in the table is a polymerizable compound represented by Formula VI, and the fourth to twelfth compounds in the table are other types of liquid crystal compounds. It can be understood that the liquid crystal material in the liquid crystal composition provided in Example 2 is composed of the first twelve compounds in Table 2.

[0126] Table 2 Component distribution and performance parameters of the liquid crystal composition of Example 2

[0127]

[0128] Comparing Table 1 and Table 2, it can be seen that the self-alignment additive provided in Example 2 is different from the self-alignment additive provided in Example 1, and only part of the liquid crystal compounds in the liquid crystal materials provided in Example 1 and Example 2 are the same.

[0129] Specifically, in the liquid crystal composition provided in Example 2, the weight percentage of the self-alignment additive represented by Formula Ⅰ-11-2-1 is 0.6%, the weight percentage of the liquid crystal compound represented by Formula Ⅱ is 37%, and the weight percentage of the polymerizable compound represented by Formula VI is 0.3%.

[0130] It should be noted that the weight percentage of each liquid crystal compound in Table 2 is relative to the weight percentage of the liquid crystal material being 100%, and the weight percentage of the self-alignment additive and the polymerizable compound in Table 2 is relative to the weight percentage of the liquid crystal composition being 100%. In other words, the weight percentage of the self-alignment additive and the polymerizable compound in Table 2 is relative to the weight percentage of the liquid crystal material being 99.1%.

[0131] Specifically, the performance parameters of the liquid crystal composition provided in Example 2 are shown in Table 2. It can be seen that the liquid crystal composition has a relatively high clearing point temperature (Tni), and no crystallization occurs under extremely low temperature conditions, indicating that the liquid crystal composition has good stability; and the liquid crystal composition has a negative dielectric anisotropy (Δε is less than 0), and the absolute value of Δε (|Δε|) is relatively large, which can further improve the response speed of the liquid crystal composition; in addition, the bending elastic constant K of the liquid crystal composition is 33 The larger the value, the better it is for reducing the response time of the liquid crystal composition, thereby accelerating the response speed of the liquid crystal composition; in addition, the liquid crystal composition has a larger optical anisotropy (Δn), thereby increasing the transmittance of the liquid crystal display panel and improving the viewing angle of the liquid crystal display panel.

[0132] More importantly, the liquid crystal composition provided in Example 2 was introduced into a test box without a polyimide alignment layer for testing, and it was found that the liquid crystal composition had the characteristics of spontaneous vertical alignment relative to the substrate surface, and the alignment could remain stable until the clearing point. When a certain voltage was applied to the test box and UV light was irradiated, the liquid crystal composition in the test box formed a certain pre-tilt angle; and by applying a voltage at both ends of the test box, the liquid crystal box could achieve reversible switching of light transmittance.

[0133] Embodiment 3

[0134] As shown in Table 3, Example 3 of the present application provides another liquid crystal composition, which includes a liquid crystal material composed of a plurality of liquid crystal compounds, a polymerizable compound and two self-alignment additives.

[0135] As can be seen from Table 3, the first three compounds in the table are liquid crystal compounds represented by Formula II, the last two compounds in the table are self-alignment additives represented by Formula I-6-4-1 and Formula I-6-1-1, respectively, the twelfth compound in the table is a polymerizable compound represented by Formula VI, and the fourth to eleventh compounds in the table are other types of liquid crystal compounds. It can be understood that the liquid crystal material in the liquid crystal composition provided in Example 3 is composed of the first eleven compounds in Table 3.

[0136] By comparing Table 1, Table 2 and Table 3, it can be seen that the self-alignment additive provided in Example 3 is different from the self-alignment additives provided in Example 1 and Example 2, and there are two different self-alignment additives in Example 3, while there is only one self-alignment additive in Example 1 and Example 2; in addition, only some liquid crystal compounds are the same in the liquid crystal materials provided in Example 1, Example 2 and Example 3.

[0137] It should be noted that due to the limited solubility of self-alignment additives in liquid crystal compositions, if the content of one self-alignment additive in the liquid crystal composition is too high, it will cause the self-alignment additive to precipitate. The combined use of two or more different self-alignment additives can increase the total content of the self-alignment additives, which is beneficial to improving the alignment ability of the liquid crystal material.

[0138] Specifically, in the liquid crystal composition provided in Example 3, the weight percentage of each self-alignment additive is 0.4%, the weight percentage of the liquid crystal compound represented by Formula II is 34%, and the weight percentage of the polymerizable compound is 0.3%.

[0139] It should be noted that the weight percentages of the various liquid crystal compounds in Table 3 are relative to the weight percentage of the liquid crystal material being 100%, and the weight percentages of the self-alignment additives and polymerizable compounds in Table 3 are relative to the weight percentage of the liquid crystal composition being 100%. In other words, the weight percentages of the self-alignment additives and polymerizable compounds in Table 3 are relative to the weight percentage of the liquid crystal material being 98.9%.

[0140] Specifically, the performance parameters of the liquid crystal composition provided in Example 3 are shown in Table 3. It can be seen that the liquid crystal composition has a relatively high clearing point temperature (Tni), and no crystallization occurs under extremely low temperature conditions, indicating that the liquid crystal composition has good stability; and the liquid crystal composition has a negative dielectric anisotropy (Δε is less than 0), and the absolute value of Δε (|Δε|) is relatively large, which can further improve the response speed of the liquid crystal composition; in addition, the bending elastic constant K of the liquid crystal composition is 33 The larger the value, the better it is for reducing the response time of the liquid crystal composition, thereby accelerating the response speed of the liquid crystal composition; in addition, the liquid crystal composition has a larger optical anisotropy (Δn), thereby increasing the transmittance of the liquid crystal display panel and improving the viewing angle of the liquid crystal display panel.

[0141] Table 3 Component distribution and performance parameters of the liquid crystal composition of Example 3

[0142]

[0143] More importantly, the liquid crystal composition provided in Example 3 was introduced into a test box without a polyimide alignment layer for testing, and it was found that the liquid crystal composition had the characteristics of spontaneous vertical alignment relative to the substrate surface, and the alignment could remain stable until the clearing point. When a certain voltage was applied to the test box and UV light was irradiated, the liquid crystal composition in the test box formed a certain pre-tilt angle; and by applying a voltage at both ends of the test box, the liquid crystal box could achieve reversible switching of light transmittance.

[0144] Comparative Example

[0145] As shown in Table 4, the comparative example of the present application provides another liquid crystal composition, which only includes a liquid crystal material composed of a plurality of liquid crystal compounds and a polymerizable compound.

[0146] Table 4 Component distribution and performance parameters of the liquid crystal composition of the comparative example

[0147]

[0148] It can be understood that the liquid crystal composition provided in the control example does not contain any self-alignment additives, and the composition of the liquid crystal composition is consistent with the composition of the liquid crystal composition shown in Table 1 after removing the self-alignment additives; that is, the control example is a control example of Example 1.

[0149] Comparing Table 4 with Table 1, it can be seen that the characteristic parameters of the liquid crystal composition provided in the control example are very close to the characteristic parameters of the liquid crystal composition provided in Example 1, that is, after adding the self-alignment additive to the liquid crystal material, it will not have a negative impact on its physical parameters.

[0150] Specifically, the liquid crystal composition provided in the control example was introduced into a test box without a polyimide alignment layer for testing, and it was found that the liquid crystal composition did not have the characteristic of spontaneous vertical alignment relative to the substrate surface, and the liquid crystal composition could not form a certain pretilt angle. Moreover, when a voltage was applied to both ends of the test box, the liquid crystal box could not control the amount of light transmitted. It can be seen from this that the self-alignment additive plays a role in vertical self-alignment in the liquid crystal composition provided in Example 1; in other words, the self-alignment additive provided in this application has the function of vertical self-alignment.

[0151] It can be understood that the liquid crystal compositions provided in Implementation 1, Implementation 2 and Implementation 3 have the function of vertical self-alignment because at least one self-alignment additive shown in Formula I is added. Therefore, when the liquid crystal compositions provided in Implementation 1, Implementation 2 and Implementation 3 are applied to a liquid crystal display panel, it is not necessary to form a PI alignment layer on the surface of the substrate. When the liquid crystal composition provided in the comparative example is applied to a liquid crystal display panel, it is necessary to form a PI alignment layer on the surface of the substrate.

[0152] Typically, a liquid crystal box with a PI alignment layer needs to complete the PI alignment layer process before performing liquid crystal dripping (One Drop Fill, ODF), the first ultraviolet light irradiation (UV1) and the second ultraviolet light irradiation (UV2) processes. The liquid crystal composition provided in the embodiments of the present application has a self-alignment function. Therefore, when using the liquid crystal composition liquid crystal box provided in the embodiments of the present application, there is no need to prepare the PI alignment layer. The liquid crystal dripping (ODF), the first ultraviolet light irradiation (UV1) and the second ultraviolet light irradiation (UV2) processes can be performed directly, thereby saving the PI process technology, which is beneficial to saving materials and production costs, shortening the panel process time, and can also save the process illumination time in the subsequent vertical alignment stage.

[0153] The self-aligning additives provided in the embodiments of the present application are very suitable for the preparation of mixed liquid crystals. After adding the self-aligning additives represented by Formula I to the liquid crystal material, a liquid crystal composition with self-aligning function is formed, which can reduce the PI alignment layer process in the liquid crystal box manufacturing process, which is beneficial to reducing the number of panel process steps and saving production capacity, etc., and has positive significance for the development of green manufacturing technology.

[0154] like Figure 1As shown, an embodiment of the present application further provides a liquid crystal display panel 10, which includes a first substrate 11, a second substrate 12, a self-alignment layer 13 and a liquid crystal layer 14. The first substrate 11 and the second substrate 12 are arranged opposite to each other, the self-alignment layer 13 is arranged at least on a side of the first substrate 11 close to the second substrate 12, the liquid crystal layer 14 is arranged between the self-alignment layer 13 and the second substrate 12, and the self-alignment layer 13 is formed by polymerization of the self-alignment additive in the liquid crystal composition described in the above embodiments.

[0155] It can be understood that the self-alignment layer 13 is formed at least on the first substrate 11 after the liquid crystal is injected, and there is no need to set an additional PI alignment layer before the liquid crystal is injected. The material used for liquid crystal injection is the liquid crystal composition provided in the above embodiment. After the liquid crystal is injected and sealed, the self-alignment additive in the liquid crystal composition is polymerized at least on the surface of the first substrate 11 by UV light or other means to form the self-alignment layer 13. In other words, the material of the liquid crystal layer 14 is composed of the liquid crystal material in the liquid crystal composition provided in the above embodiment.

[0156] In some embodiments, the self-alignment layer 13 is also formed on a side of the second substrate 12 close to the liquid crystal layer 14 .

[0157] Specifically, the liquid crystal display panel 10 includes any one of VA, PSA, PS-VA, PVA or MVA modes.

[0158] Specifically, the first substrate 11 is an opposing substrate (or a color filter substrate), and the second substrate 12 is an array substrate.

[0159] Specifically, the liquid crystal display panel 10 also includes an electrode group formed on one or both of the first substrate 11 and the second substrate 12 , a plurality of active elements (such as thin film transistors) located in the second substrate 12 , and a color filter layer located on the first substrate 11 or the second substrate 12 .

[0160] In a specific embodiment, the electrode group includes pixel electrodes located on the second substrate 12 and common electrodes located on the first substrate 11 and / or the second substrate 12 .

[0161] In a specific embodiment, the color film layer includes red (R) color resist, green (G) color resist and blue (B) color resist distributed in an array; wherein the red color resist contains diketopyrrolopyrrole or other organic pigment compounds, the proportion of water-soluble pigments contained in the red color resist is not higher than 1.5%, and 90% of the pigment particles have a particle size range of 0-100nm.

[0162] For example, the particle size of the pigment particles in the red color resist may be 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm, but is not limited thereto.

[0163] It can be understood that the smaller the particle size of the pigment particles in the red color resist, the more conducive it is to uniform distribution of the pigment, thereby helping to improve the product's penetration, reliability and color gamut.

[0164] In an embodiment of the present application, during the preparation process of the liquid crystal box, the liquid crystal composition sandwiched between the first substrate 11 and the second substrate 12 contains a self-alignment additive shown in Formula I, and the anchoring group T in the self-alignment additive can be anchored to the surface of the first substrate 11 and / or the second substrate 12, and the polymerizable group Sp in the self-alignment additive can undergo a polymerization reaction under ultraviolet light to form a polymer layer on the surface of the first substrate 11 and / or the second substrate 12, namely, the self-alignment layer 13; the rigid chain group in the polymer of the self-alignment layer 13 acts as a steric obstacle perpendicular to the surface of the first substrate 11 and / or the second substrate 12, thereby guiding the liquid crystal molecules to align perpendicularly to the first substrate 11 and / or the second substrate 12, thereby realizing the vertical self-alignment function.

[0165] The above rigid chain group is composed of cyclic groups A and B, a central group located between the cyclic groups A and B and terminal groups The cooperation of multiple different cyclic groups can extend the length of the rigid chain group, which is beneficial to improving the alignment ability of the self-alignment layer 13 to the liquid crystal material. When X in is selected from -O- or -S-, the angle formation rate of the liquid crystal composition in the first ultraviolet irradiation process (UV1) can be slowed down, thereby facilitating the improvement of alignment uniformity. Therefore, the self-alignment layer 13 provided in the present application has good self-alignment capability.

[0166] In addition, the material of the liquid crystal layer 14 is the liquid crystal material in the liquid crystal composition, and the liquid crystal material includes the liquid crystal compound represented by Formula II. The liquid crystal compound is a neutral single crystal and has the characteristics of low viscosity, which can reduce the response time of the liquid crystal composition and is beneficial to improving the response speed of the liquid crystal composition.

[0167] Therefore, the embodiment of the present application adopts the above-mentioned liquid crystal composition to form the self-alignment layer 13 and the liquid crystal layer 14, which can improve the liquid crystal response speed while eliminating the traditional polyimide alignment film process, thereby simplifying the process of the liquid crystal display panel while ensuring the liquid crystal alignment effect and response speed, which is beneficial to saving materials and production costs and shortening the production time of the liquid crystal display panel.

[0168] It should be noted that the function of the self-alignment additive provided in the embodiments of the present application is not limited to vertical self-alignment. The angle between the rigid chain group in the self-alignment additive and the substrate can be adjusted according to the alignment angle requirements of the liquid crystal display panel, thereby achieving an alignment function at a preset angle.

[0169] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0170] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A liquid crystal composition, characterized in that: The invention comprises a liquid crystal material and a self-aligning additive, wherein the self-aligning additive comprises at least one of the compounds represented by formula I, and the liquid crystal material comprises at least one of the compounds represented by formula II: Wherein, R1 is selected from -H, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, and an aromatic ring having 3-10 carbon atoms; any one or multiple non-adjacent -CH2- in the R1 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-; one or more H in the R1 group is not substituted or is substituted by one of F, Cl, Br, and I; Z1, Z2 and Z3 are selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, any non-adjacent -CH2- in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the Z1, Z2 and Z3 groups is not substituted or is substituted by one of F, Cl, Br and I; X is selected from a single bond, -O- or -S-; L is selected from -H, -F, -Cl, -CF3, -Sp, an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, an alkenyl group having 2-10 carbon atoms, an alkenyloxy group having 2-10 carbon atoms, an alkynyl group having 2-10 carbon atoms, an alkynyloxy group having 2-10 carbon atoms, a cycloalkane group having 3-10 carbon atoms, an aromatic ring having 3-10 carbon atoms, any one or more non-adjacent -CH2- in the L group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -OC(O)O-, -CH2CH2-, -(CH2)3-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, and one or more H in the L group is not substituted or is substituted by one of F, Cl, Br and I; Selected from in, Any non-adjacent -CH2- in is unsubstituted or substituted with -O-; Selected from The H on the benzene ring of the compound represented by Formula I is not substituted or is substituted by F, Cl, Br, CN, SCN, NCS, 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; R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyloxy groups having 2 to 10 carbon atoms, the terminal groups of R2 and R3 are unsubstituted or substituted with -CN or -CF3, and R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, and the terminal groups of R2 and R3 are unsubstituted or substituted with -CN or -CF3, and R2 and R3 are selected from -H, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkynyl groups having 1 to 10 carbon atoms, alkenyloxy groups having 2 ... groups having 2 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyl groups having 2 to One or more -CH2- in the 3 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, -C≡C- and the heteroatom is not directly bonded, and one or more H in the R2 and R3 groups is not substituted or is substituted by one of F, Cl, Br and I; n is selected from 1, 2 or 3; a and b are selected from 0, 1, 2 or 3, and a+b≥1; c, d, p and q are selected from 0, 1 or 2; Sp is selected from an ether group, an alkyl group, an alkoxy group or a polymerizable group, and at least one Sp in the formula I is selected from a polymerizable group; T represents a group containing a hydroxyl group.

2. The liquid crystal composition according to claim 1, characterized in that: n is selected from 1 or 2; a and b are selected from 0, 1 or 2, and a+b≥1; c, d, p and q are selected from 0 or 1.

3. The liquid crystal composition according to claim 1, characterized in that: The self-aligning additive is selected from at least one of the compounds represented by Formula I-1 to Formula I-28: wherein n is selected from 1 or 2, and a and b are selected from 1 or 2.

4. The liquid crystal composition according to claim 1 or 3, characterized in that: The group T in the formula I is selected from at least one of the groups represented by formula III: Wherein, R4, R5 and R6 are selected from -H, -OH, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, alkynyloxy groups having 2 to 10 carbon atoms, the terminal groups of R4, R5 and R6 are not substituted or are substituted with -OH, -CN or -CF3, and R4, R5 and R6 are selected from -H, -OH, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkoxy groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkynyl groups having 2 to 10 carbon atoms, and the terminal groups of R4, R5 and R6 are not substituted or are substituted with -OH, -CN or -CF3, and R4, R5 and R6 are selected from -H, -OH, -F, -Cl, -Br, -CN, -SCN, -NCS, alkyl groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, alkenyl groups having 2 to 10 carbon atoms, alkenyloxy groups having 2 to 10 carbon atoms, and the terminal groups of R4, R5 and R6 are not substituted or are substituted with -OH, -CN or -CF3, and One or more -CH2- in the R6 group is not substituted or is replaced by -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH- or -C≡C- and the heteroatom is not directly bonded, one or more H in the R4, R5 and R6 groups is not substituted or is replaced by F, Cl, Br or I, and the terminal group of at least one of the R4, R5 and R6 groups is a hydroxyl group; k is selected from any integer between 0 and 10; Z4 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms. Any non-adjacent -CH2- in the Z4 group is not substituted or is substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-. One or more H in the Z4 group is not substituted or is substituted by one of F, Cl, Br, and I.

5. The liquid crystal composition according to claim 1 or 3, characterized in that: The Sp group in the formula I is selected from an ether group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, a group represented by formula IV or formula V, and at least one Sp group is selected from a group represented by formula IV or formula V: Wherein, m is selected from any integer between 0 and 10; Z5 is selected from a single bond, -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, an alkylene group having 1-10 carbon atoms, an alkenylene group having 2-10 carbon atoms, and an alkynyl group having 2-10 carbon atoms. Any non-adjacent -CH2- in the Z5 group is not substituted or substituted by one of -O-, -S-, -CO-, -C(O)O-, -OC(O)-, -CF2O-, -OCF2-, -CH2CH2-, -CH2O-, -OCH2-, -CH=CH-, and -C≡C-. One or more H in the Z5 group is not substituted or substituted by one of F, Cl, Br and I.

6. The liquid crystal composition according to claim 1, characterized in that: The self-aligning additive is selected from at least one of the compounds represented by Formula I-1-1 to Formula I-28-4:

7. The liquid crystal composition according to claim 1, characterized in that: The self-aligning additive is selected from at least one of the compounds represented by formula I-6-1-1, formula I-6-4-1 and formula I-11-2-1:

8. The liquid crystal composition according to claim 1 or 7, characterized in that: The liquid crystal composition further comprises a polymerizable compound or a polymer containing the polymerized form thereof, wherein the polymerizable compound comprises a compound represented by formula VI:

9. The liquid crystal composition according to claim 1, characterized in that: The mass percentage of the self-alignment additive represented by formula I in the liquid crystal composition is in the range of 0.01% to 1.50%, and the mass percentage of the liquid crystal material represented by formula II in the liquid crystal composition is in the range of 5% to 70%.

10. A liquid crystal display panel, characterized in that: It includes a first substrate and a second substrate arranged relatively to each other, a self-alignment layer arranged at least on a side of the first substrate close to the second substrate, and a liquid crystal layer arranged between the self-alignment layer and the second substrate, wherein the self-alignment layer is formed by polymerizing the self-alignment additive in the liquid crystal composition according to any one of claims 1 to 9.

Images