WO2017084154A1 - 反应型垂直取向材料、液晶显示面板、及液晶配向方法 - Google Patents

反应型垂直取向材料、液晶显示面板、及液晶配向方法 Download PDF

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WO2017084154A1
WO2017084154A1 PCT/CN2015/098621 CN2015098621W WO2017084154A1 WO 2017084154 A1 WO2017084154 A1 WO 2017084154A1 CN 2015098621 W CN2015098621 W CN 2015098621W WO 2017084154 A1 WO2017084154 A1 WO 2017084154A1
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liquid crystal
group
vertical alignment
reactive
alignment material
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French (fr)
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兰松
马小龙
李泳锐
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
    • C07C57/30—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing six-membered aromatic rings
    • C07C57/42—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing six-membered aromatic rings having unsaturation outside the rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
    • C07C59/40—Unsaturated compounds
    • C07C59/58—Unsaturated compounds containing ether groups, groups, groups, or groups
    • C07C59/64—Unsaturated compounds containing ether groups, groups, groups, or groups containing six-membered aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10—Esters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133719—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films with coupling agent molecules, e.g. silane
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10—Esters
    • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
    • C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
    • C08F222/1025—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate of aromatic dialcohols
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
    • C09K2019/0448—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a reactive vertical alignment material, a liquid crystal display panel, and a liquid crystal alignment method.
  • LCDs liquid crystal displays
  • Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become mainstream in display devices.
  • liquid crystal display devices which include a liquid crystal display panel and a backlight module.
  • the working principle of the liquid crystal display panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules are controlled to change direction by energizing or not, and the light of the backlight module is changed. Refracted to produce a picture.
  • a liquid crystal display panel comprises a CF (Color Filter) substrate, a thin film transistor (TFT) substrate, a liquid crystal (LC) sandwiched between the color filter substrate and the thin film transistor substrate, and a sealant frame ( Sealant) composition.
  • CF Color Filter
  • TFT thin film transistor
  • LC liquid crystal
  • Sealant sealant frame
  • an alignment film commonly used polyimide (PI) material
  • the main component of such a phase-matching film is a friction-aligned PI material or a photo-aligned PI material, but any alignment material has its own disadvantages.
  • the friction-aligned PI material is liable to cause problems such as dust particles, static electricity, and brush marks, thereby reducing the process yield.
  • the photo-alignment type PI material can avoid these problems, heat resistance and aging resistance are limited due to material properties.
  • the PI material itself has high polarity and high water absorption, storage and transportation are easy to cause deterioration and lead to uneven alignment, and PI
  • the material is expensive, and the process of film formation on the TFT-LCD is also complicated, resulting in an increase in panel cost. Then, in the TFT-LCD, if the liquid crystal molecules can be aligned even in the case where the PI film is omitted, the cost of the production panel can be greatly reduced.
  • the main group, the intermediate group, and the tail group are three parts.
  • the main function of the head group is to use the polar group to anchor to the surface of the inorganic substrate by physical action on the one hand, and to utilize the other side.
  • the polymerization reaction between the double bond and the reactive monomer is anchored on the surface of the substrate;
  • the main function of the intermediate group and the tail group is that the liquid crystal molecules are vertically aligned in a sterically hindrance manner similar to the action of the polyimide branch.
  • Another object of the present invention is to provide a liquid crystal display panel comprising liquid crystal molecules, the above-mentioned reactive vertical alignment material, and a reactive monomer.
  • the reactive vertical alignment material and the reactive single sheet are irradiated under UV light.
  • the body is polymerized on the surface of the substrate to achieve the purpose of anchoring the liquid crystal molecules, which not only simplifies the process of the TFT-LCD, but also greatly reduces the production cost of the TFT-LCD.
  • Another object of the present invention is to provide a liquid crystal alignment method by first applying liquid crystal molecules, reactive vertical alignment materials, and reactive monomers in a liquid crystal layer of a liquid crystal display panel, first applying a voltage to the liquid crystal layer to deflect liquid crystal molecules. Then, the liquid crystal layer is irradiated with UV light, so that the reactive vertical alignment material and the reactive monomer are polymerized on the surfaces of the first and second substrates to achieve the purpose of anchoring the liquid crystal molecules. After the voltage is released, the liquid crystal molecules generate a pretilt angle.
  • the present invention provides a reactive vertical alignment material having a structural formula of A-Z-R, wherein
  • the structural formula of the reactive vertical alignment material is:
  • the present invention also provides a liquid crystal display panel including a first and a second substrate disposed opposite to each other, a liquid crystal layer interposed between the first and second substrates, and a surface of the first substrate facing the liquid crystal layer. a first electrode and a second electrode disposed on a surface of the second substrate facing the liquid crystal layer; the liquid crystal layer comprising liquid crystal molecules, a reactive vertical alignment material, and a reactive vertical alignment material under ultraviolet light irradiation a reactive monomer for polymerization;
  • the structural formula of the reactive vertical alignment material is:
  • the reactive monomer is one or more of the following four compounds:
  • the content of the reactive vertical alignment material is 0.1 to 5 wt%; and the content of the reactive monomer is 0.01 to 0.1 wt%.
  • the first and second substrates are respectively a CF substrate and a TFT substrate; the first electrode and the second electrode are a common electrode and a pixel electrode, respectively.
  • the invention also provides a liquid crystal alignment method comprising the following steps:
  • Step 1 providing a liquid crystal display panel, comprising: first and second substrates disposed opposite to each other, a liquid crystal layer interposed between the first and second substrates, and a surface disposed on a surface of the first substrate facing the liquid crystal layer An electrode, and a second electrode disposed on a surface of the second substrate facing the liquid crystal layer; the liquid crystal layer comprising liquid crystal molecules, a reactive vertical alignment material, and polymerization with a reactive vertical alignment material under ultraviolet light irradiation Reactive monomer of the reaction;
  • Step 2 applying a voltage to both sides of the liquid crystal layer through the first electrode and the second electrode to deflect the liquid crystal molecules;
  • Step 3 while applying voltage to both sides of the liquid crystal layer, irradiating the liquid crystal display panel with UV light, so that the reactive vertical alignment material and the reactive monomer are polymerized on the surfaces of the first and second substrates to achieve anchoring of the liquid crystal molecules.
  • Step 4 Stop applying a voltage to both sides of the liquid crystal layer, so that the liquid crystal molecules generate a pretilt angle.
  • the content of the reactive vertical alignment material in the liquid crystal layer is 0.1 to 5 wt%; and the content of the reactive monomer is 0.01 to 0.1 wt%.
  • the voltage applied to both sides of the liquid crystal layer is 15 to 25 V; in the step 3, the intensity of the UV light irradiated to the liquid crystal display panel is 50 to 85 mW/cm 2 ; The wavelength of the UV light is 365 nm.
  • the intermediate group Z and the tail group R can function similarly to the PI branch, and the liquid crystal molecules are vertically oriented in a steric hindrance manner;
  • the liquid crystal display panel adopting the reactive vertical alignment material can not use the alignment film, can not only simplify the process of the TFT-LCD, but also greatly reduce the production cost of the TFT-LCD; the liquid crystal alignment method is simple, and the liquid crystal alignment effect is good. .
  • FIG. 1 is a schematic structural view of a reactive vertical alignment material of the present invention
  • FIG. 2 is a schematic structural view of a liquid crystal display panel of the present invention and a schematic diagram of step 1 of the liquid crystal alignment method of the present invention
  • step 2 of the liquid crystal alignment method of the present invention is a schematic view of step 2 of the liquid crystal alignment method of the present invention.
  • step 3 of the liquid crystal alignment method of the present invention is a schematic view of step 3 of the liquid crystal alignment method of the present invention.
  • FIG. 5 is a schematic diagram of step 4 of the liquid crystal alignment method of the present invention.
  • Figure 6 is a scanning electron micrograph of a polymer layer obtained by polymerizing a reactive vertical alignment material and a reactive monomer on a substrate surface in a preferred embodiment of the liquid crystal alignment method of the present invention.
  • the present invention provides a reactive vertical alignment material having a structural formula of A-Z-R, wherein
  • the structural formula of the reactive vertical alignment material is:
  • the invention provides a reactive vertical alignment material having the structural formula of AZR, wherein the role of the head group A is mainly anchoring, and on the one hand, the substrate can be anchored to the substrate by means of a physical interaction.
  • RM reactive monomer
  • the action of the PI branching causes the liquid crystal molecules to be vertically oriented in a steric hindrance manner; thus, the liquid crystal display panel using the reactive vertical alignment material can be used without using an alignment film, which not only simplifies the process of the TFT-LCD, but also greatly reduces the process.
  • the production cost of TFT-LCD The production cost of TFT-LCD.
  • the present invention further provides a liquid crystal display panel including first and second substrates 1 and 2 disposed opposite to each other, and a liquid crystal layer 3 interposed between the first and second substrates 1 and 2, and is disposed on a first electrode 11 facing the surface of the liquid crystal layer 3 on the first substrate 1 and a second electrode 21 disposed on a surface of the second substrate 2 facing the liquid crystal layer 3;
  • the liquid crystal layer 3 including liquid crystal molecules 31 a reactive vertical alignment material 32, and a reactive monomer 33 which is polymerizable with the reactive vertical alignment material 32 under ultraviolet light irradiation;
  • the structural formula of the reactive vertical alignment material 32 is:
  • the reactive monomer 33 may be any reactive monomer used in the polymer vertical alignment technique (PSVA).
  • PSVA polymer vertical alignment technique
  • the reactive monomer 33 may be one or more of the following four compounds:
  • the content of the reactive vertical alignment material 32 is 0.1 to 5 wt%, and the content of the reactive monomer 33 is 0.01 to 0.1 wt%.
  • the first and second substrates 1 and 2 are respectively a CF substrate and a TFT substrate; and the first electrode 11 and the second electrode 21 are a common electrode and a pixel electrode, respectively.
  • the present invention further provides a liquid crystal alignment method, comprising the following steps:
  • a liquid crystal display panel including first and second substrates 1 and 2 disposed opposite to each other, and a liquid crystal layer 3 interposed between the first and second substrates 1 and 2, and is disposed on a first electrode 11 facing the surface of the liquid crystal layer 3 on the first substrate 1 and a second electrode 21 disposed on a surface of the second substrate 2 facing the liquid crystal layer 3; the liquid crystal layer 3 including liquid crystal molecules 31 a reactive vertical alignment material 32 and a reactive monomer 33 which is polymerized with the reactive vertical alignment material 32 under ultraviolet light irradiation; when no voltage is applied, the liquid crystal molecules 31 are perpendicular to the first and second substrates 1, 2 arrangement.
  • the structural formula of the reactive vertical alignment material 32 is:
  • the reactive monomer 33 may be any reactive monomer used in the polymer vertical alignment technique (PSVA).
  • PSVA polymer vertical alignment technique
  • the reactive monomer 33 may be one or more of the following four compounds:
  • the content of the reactive vertical alignment material 32 is 0.1 to 5 wt%, and the content of the reactive monomer 33 is 0.01 to 0.1 wt%.
  • the first and second substrates 1 and 2 are respectively a CF substrate and a TFT substrate; and the first electrode 11 and the second electrode 21 are a common electrode and a pixel electrode, respectively.
  • Step 2 As shown in FIG. 3, a voltage of 15 to 25 V is applied to both sides of the liquid crystal layer 3 through the first electrode 11 and the second electrode 21 to deflect the liquid crystal molecules 31.
  • Step 3 as shown in FIG. 4, while applying a voltage of 15 to 25 V to both sides of the liquid crystal layer 3, the liquid crystal display panel is irradiated with UV light of 50 to 85 mW/cm 2 to make the reactive vertical alignment material 32 and reactivity.
  • the monomer 33 is polymerized on the surfaces of the first and second substrates 1, 2 to achieve the purpose of anchoring the liquid crystal molecules 31.
  • the UV light has a wavelength of 365 nm.
  • the polymerization reaction between the reactive vertical alignment material 32 and the reactive monomer 33 is a radical polymerization reaction, which is specifically described as: reactive monomer 33 under UV light irradiation.
  • reactive monomer 33 under UV light irradiation.
  • the double bond on the bond breaks and generates a radical, which causes the polymerization reaction to occur.
  • the self-polymerization of the reactive monomer 33 also reacts with the double bond in the reactive vertical alignment material 32 to form a cross-linked network. The structure, and thus the ability to anchor liquid crystal molecules, is greatly enhanced.
  • Step 4 as shown in FIG. 5, the application of a voltage to both sides of the liquid crystal layer 3 is stopped, so that the liquid crystal molecules 31 generate a pretilt angle.
  • the reactive vertical alignment material in the liquid crystal layer of the liquid crystal display panel provided in step 1 is Reactive monomer
  • the reactive vertical alignment material and the reactive monomer are polymerized on the surfaces of the first and second substrates to obtain a polymer layer.
  • the photo of the polymer layer under a scanning electron microscope (SEM) of 160,000 times is as follows. Figure 6 shows.
  • the obtained liquid crystal display panel has a dark state effect when no power is applied, thereby demonstrating that the method for performing liquid crystal alignment by the reactive vertical alignment material of the present invention can surely achieve the effect of vertical alignment of the liquid crystal.
  • the present invention provides a liquid crystal display panel comprising a liquid crystal layer 31, a reactive vertical alignment material 32, and a reactive monomer 33 which is polymerized with the reactive vertical alignment material 32 under ultraviolet light irradiation.
  • the liquid crystal molecules are vertically oriented; thus, the liquid crystal display panel using the reactive vertical alignment material can be used without using an alignment film, which not only simplifies the process of the TFT-LCD, but also greatly reduces the production cost of the TFT-LCD.
  • the reaction formula of the step 1 is as follows:
  • the solvent may be N-methylpyrrolidone.
  • the reaction formula of the step 2 is as follows:
  • the reaction formula of the step 1 is as follows:
  • the KI having a molar ratio of 1 to 1.2 is reacted at 25 ° C for 1 to 5 hours to obtain the product iodobenzene (VI);
  • the reaction formula of the step 2 is as follows:
  • the solvent may be N-methylpyrrolidone.
  • the reaction formula of the step 3 is as follows:
  • RM reactive monomer
  • the intermediate group Z and the tail group R can function similarly to the PI branch, and the liquid crystal molecules are vertically oriented in a steric hindrance manner; thus, the liquid crystal display panel using the reactive type vertical alignment material can be omitted.
  • the alignment film not only simplifies the process of the TFT-LCD, but also greatly reduces the production cost of the TFT-LCD; the liquid crystal alignment method is simple, and the liquid crystal alignment effect is good.

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Abstract

本发明提供一种反应型垂直取向材料、液晶显示面板、及液晶配向方法，所述反应型垂直取向材料的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是>其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。其中，头部基团A的作用主要是锚固作用，一方面可依靠-COOH基团以物理作用的方式锚定在基板表面，另一方面可依靠或-CH＝CH-基团与反应性单体反应进一步增强锚定液晶分子的能力；中间基团Z和尾部基团R可以起到类似于PI支链的作用，以立体障碍的方式使得液晶分子垂直取向。

Description

反应型垂直取向材料、液晶显示面板、及液晶配向方法 技术领域
本发明涉及显示技术领域，尤其涉及一种反应型垂直取向材料、液晶显示面板、及液晶配向方法。
背景技术
随着显示技术的发展，液晶显示器(Liquid Crystal Display，LCD)等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
现有市场上的液晶显示装置大部分为背光型液晶显示器，其包括液晶显示面板及背光模组(backlight module)。液晶显示面板的工作原理是在两片平行的玻璃基板当中放置液晶分子，两片玻璃基板中间有许多垂直和水平的细小电线，通过通电与否来控制液晶分子改变方向，将背光模组的光线折射出来产生画面。
通常液晶显示面板由彩膜(CF，Color Filter)基板、薄膜晶体管(TFT，Thin Film Transistor)基板、夹于彩膜基板与薄膜晶体管基板之间的液晶(LC，Liquid Crystal)及密封胶框(Sealant)组成。
在液晶显示器的CF基板和TFT基板上，分别有一层薄膜材料，其主要作用是使液晶分子按一定方向排列，我们称之为配向膜(常用聚酰亚胺(PI)材料)。这种配相膜的主要成分为摩擦配向型PI材料或光配向型PI材料，但是，无论那种配向材料都会有各自的缺点。首先摩擦配向型PI材料容易造成粉尘颗粒、静电残留、刷痕等问题，从而降低工艺良率，而光配向型PI材料虽然可以避免这些问题，但由于材料特性受限，耐热性和耐老化性不佳，同时锚定LC分子的能力也较弱，从而影响面板的品质；其次，PI材料本身就具有高极性和高吸水性，存储和运送容易造成变质而导致配向不均，并且PI材料价格昂贵，在TFT-LCD上成膜的工艺也较为复杂，导致面板成本提高。那么在TFT-LCD中，如果能够在省去PI膜的情况下，还能使液晶分子排列，这将会大大降低生产面板的成本。
发明内容
本发明的目的在于提供一种反应型垂直取向材料，其结构主要包括头 部基团、中间基团、及尾部基团三部分，头部基团的主要作用是一方面是利用自身的极性基团以物理作用的方式锚定在无机基板表面，另一方面是利用双键与反应性单体之间的聚合反应锚定在基板表面；中间基团与尾部基团的主要作用是类似于聚酰亚胺支链的作用以立体障碍的方式使液晶分子垂直排列。
本发明的目的还在于提供一种液晶显示面板，液晶层中包含液晶分子、上述反应型垂直取向材料、及反应性单体，在UV光照射下，所述反应型垂直取向材料与反应性单体在基板表面聚合，从而达到锚定液晶分子的目的，不仅可以简化TFT-LCD的制程，而且还大大降低TFT-LCD的生产成本。
本发明的目的还在于提供一种液晶配向方法，通过在液晶显示面板的液晶层中设置液晶分子、反应型垂直取向材料、及反应性单体，首先对液晶层施加电压，使得液晶分子偏转，之后对液晶层进行UV光照射，使得反应型垂直取向材料与反应性单体在第一、第二基板表面聚合，从而达到锚定液晶分子的目的，释放电压后，液晶分子产生预倾角。
为实现上述目的，本发明提供一种反应型垂直取向材料，其结构通式为A-Z-R，其中，
A指的是-CH＝CH-COOH；
Z指的是
Figure PCTCN2015098621-appb-000001
其中n≥1；
R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
该反应型垂直取向材料的结构式为：
Figure PCTCN2015098621-appb-000002
Figure PCTCN2015098621-appb-000003
本发明还提供一种液晶显示面板，包括相对设置的第一、第二基板、夹设于第一、第二基板之间的液晶层、设于所述第一基板朝向液晶层一侧表面的第一电极、及设于所述第二基板朝向液晶层一侧表面的第二电极；所述液晶层包括液晶分子、反应型垂直取向材料、及在紫外光照射下与反应型垂直取向材料发生聚合反应的反应性单体；
所述反应型垂直取向材料的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
Figure PCTCN2015098621-appb-000004
其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
该反应型垂直取向材料的结构式为：
Figure PCTCN2015098621-appb-000005
所述反应性单体为以下四种化合物中的一种或多种：
Figure PCTCN2015098621-appb-000006
所述液晶层中，所述反应型垂直取向材料的含量为0.1～5wt％；所述反应性单体的含量为0.01～0.1wt％。
所述第一、第二基板分别为CF基板与TFT基板；所述第一电极与第二电极分别为公共电极与像素电极。
本发明还提供一种液晶配向方法，包括以下步骤：
步骤1、提供一液晶显示面板，包括相对设置的第一、第二基板、夹设于第一、第二基板之间的液晶层、设于所述第一基板朝向液晶层一侧表面的第一电极、及设于所述第二基板朝向液晶层一侧表面的第二电极；所述液晶层包括液晶分子、反应型垂直取向材料、及在紫外光照射下与反应型垂直取向材料发生聚合反应的反应性单体；
所述反应型垂直取向材料的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
Figure PCTCN2015098621-appb-000007
其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团；
步骤2、通过第一电极与第二电极对液晶层两侧施加电压，使液晶分子发生偏转；
步骤3、继续对液晶层两侧施加电压的同时，对液晶显示面板照射UV光，使得反应型垂直取向材料与反应性单体在第一、第二基板表面聚合，以达到锚定液晶分子的目的；
步骤4、停止对液晶层两侧施加电压，使得液晶分子产生预倾角。
所述步骤1提供的液晶显示面板中，所述液晶层中，所述反应型垂直取向材料的含量为0.1～5wt％；所述反应性单体的含量为0.01～0.1wt％。
所述步骤2与步骤3中，对液晶层两侧施加的电压的大小为15～25V；所述步骤3中，对液晶显示面板照射的UV光的强度为50～85mW/cm2；所述UV光的波长为365nm。
本发明的有益效果：本发明提供一种反应型垂直取向材料、液晶显示面板、及液晶配向方法，所述反应型垂直取向材料的结构通式为A-Z-R，其中，头部基团A的作用主要是锚固作用，一方面可依靠-COOH基团以物理作用的方式锚定在基板表面，另一方面可依靠或-CH＝CH-基团与反应性单体反应进一步增强锚定液晶分子的能力；中间基团Z和尾部基团R可以起到类似于PI支链的作用，以立体障碍的方式使得液晶分子垂直取向；从而 使得采用该反应型垂直取向材料的液晶显示面板可以不使用配向膜，不仅可以简化TFT-LCD的制程，而且还大大降低了TFT-LCD的生产成本；所述液晶配向方法简单，液晶配向效果好。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为本发明的反应型垂直取向材料的结构示意图；
图2为本发明的液晶显示面板的结构示意图暨本发明的液晶配向方法步骤1的示意图；
图3为本发明的液晶配向方法步骤2的示意图；
图4为本发明的液晶配向方法步骤3的示意图；
图5为本发明的液晶配向方法步骤4的示意图；
图6为本发明的液晶配向方法的一优选实施例步骤3中反应型垂直取向材料与反应性单体在基板表面聚合后得到的聚合物层的扫描电镜照片。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1，本发明提供一种反应型垂直取向材料，其结构通式为A-Z-R，其中，
A指的是-CH＝CH-COOH；
Z指的是
Figure PCTCN2015098621-appb-000008
其中n≥1；
R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
优选的，该反应型垂直取向材料的结构式为：
Figure PCTCN2015098621-appb-000009
本发明提供的一种反应型垂直取向材料，其结构通式为A-Z-R，其中，头部基团A的作用主要是锚固作用，一方面可依靠-COOH基团以物理作用的方式锚定在基板表面，另一方面可依靠或-CH＝CH-基团与反应性单体(RM，Reactive monomer)反应进一步增强锚定液晶分子的能力；中间基团Z和尾部基团R可以起到类似于PI支链的作用，以立体障碍的方式使得液晶分子垂直取向；从而使得采用该反应型垂直取向材料的液晶显示面板可以不使用配向膜，不仅可以简化TFT-LCD的制程，而且还大大降低了TFT-LCD的生产成本。
请参阅图2，本发明还提供一种液晶显示面板，包括相对设置的第一、第二基板1、2、夹设于第一、第二基板1、2之间的液晶层3、设于所述第一基板1朝向液晶层3一侧表面的第一电极11、及设于所述第二基板2朝向液晶层3一侧表面的第二电极21；所述液晶层3包括液晶分子31、反应型垂直取向材料32、及在紫外光照射下可与反应型垂直取向材料32发生聚合反应的反应性单体33；
所述反应型垂直取向材料32的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
Figure PCTCN2015098621-appb-000010
其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
优选的，该反应型垂直取向材料32的结构式为：
Figure PCTCN2015098621-appb-000011
Figure PCTCN2015098621-appb-000012
具体的，所述反应性单体33可以为聚合物垂直配向技术(PSVA)中所使用的任何反应性单体。
优选的，所述反应性单体33可以为以下四种化合物中的一种或多种：
Figure PCTCN2015098621-appb-000013
优选的，所述液晶层3中，所述反应型垂直取向材料32的含量为0.1～5wt％，所述反应性单体33的含量为0.01～0.1wt％。
具体的，所述第一、第二基板1、2分别为CF基板与TFT基板；所述第一电极11与第二电极21分别为公共电极与像素电极。
请参阅图2-5，本发明还提供一种液晶配向方法，包括以下步骤：
步骤1、如图2所示，提供一液晶显示面板，包括相对设置的第一、第二基板1、2、夹设于第一、第二基板1、2之间的液晶层3、设于所述第一基板1朝向液晶层3一侧表面的第一电极11、及设于所述第二基板2朝向液晶层3一侧表面的第二电极21；所述液晶层3包括液晶分子31、反应型垂直取向材料32、及在紫外光照射下与反应型垂直取向材料32发生聚合反应的反应性单体33；在未施加电压时，所述液晶分子31垂直于第一、第二基板1、2排列。
具体的，所述反应型垂直取向材料32的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
Figure PCTCN2015098621-appb-000014
其中n≥1；R指的是具有 5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
优选的，该反应型垂直取向材料32的结构式为：
Figure PCTCN2015098621-appb-000015
具体的，所述反应性单体33可以为聚合物垂直配向技术(PSVA)中所使用的任何反应性单体。
优选的，所述反应性单体33可以为以下四种化合物中的一种或多种：
Figure PCTCN2015098621-appb-000016
优选的，所述液晶层3中，所述反应型垂直取向材料32的含量为0.1～5wt％，所述反应性单体33的含量为0.01～0.1wt％。
具体的，所述第一、第二基板1、2分别为CF基板与TFT基板；所述第一电极11与第二电极21分别为公共电极与像素电极。
步骤2、如图3所示，通过第一电极11与第二电极21对液晶层3两侧施加15～25V的电压，使液晶分子31发生偏转。
步骤3、如图4所示，继续对液晶层3两侧施加15～25V的电压的同时，对液晶显示面板照射50～85mW/cm2的UV光，使得反应型垂直取向材料32 与反应性单体33在第一、第二基板1、2表面聚合，以达到锚定液晶分子31的目的。
优选的，所述UV光的波长为365nm。
具体的，所述步骤3中，所述反应型垂直取向材料32与反应性单体33发生的聚合反应是一种自由基聚合反应，具体描述为：在UV光照射下，反应性单体33上的双键断裂，产生自由基，导致聚合反应的发生，反应性单体33在自聚合的同时，也会跟反应型垂直取向材料32中的双键发生聚合反应，形成一种交联网状结构，从而锚定液晶分子的能力大大增强。
步骤4、如图5所示，停止对液晶层3两侧施加电压，使得液晶分子31产生预倾角。
在本发明的液晶配向方法的一优选实施例中，步骤1所提供的液晶显示面板的液晶层中的反应型垂直取向材料为
Figure PCTCN2015098621-appb-000017
反应性单体为
Figure PCTCN2015098621-appb-000018
经步骤3后，反应型垂直取向材料与反应性单体在第一、第二基板表面聚合后，得到聚合物层，该聚合物层的在16万倍扫描电子显微镜(SEM)下的照片如图6所示。且经步骤4后，所得到的液晶显示面板在不加电时为暗态效果，从而证明了本发明的利用反应型垂直取向材料进行液晶配向的方法确实能够取得对液晶垂直取向的效果。
本发明提供的一种液晶显示面板，液晶层中包含液晶分子31、反应型垂直取向材料32、及在紫外光照射下与反应型垂直取向材料32发生聚合反应的反应性单体33，所述反应型垂直取向材料32的结构通式为A-Z-R，其中，头部基团A的作用主要是锚固作用，一方面可依靠-COOH基团以物理作用的方式锚定在基板表面，另一方面可依靠或-CH＝CH-基团与反应性单体反应进一步增强锚定液晶分子的能力；中间基团Z和尾部基团R可以起到类似于PI支链的作用，是以立体障碍的方式使得液晶分子垂直取向；从而使得采用该反应型垂直取向材料的液晶显示面板可以不使用配向膜，不仅可以简化TFT-LCD的制程，而且还大大降低了TFT-LCD的生产成本。
以下以具体实施例Ⅰ与具体实施例Ⅱ来展示两种具体结构的反应型垂直取向材料的制备方法：
具体实施例Ⅰ：
化合物
Figure PCTCN2015098621-appb-000019
的制备方法：
步骤1、按照芳香胺(I)：HCl：NaNO2＝1：(1～5)：(1.01～1.10)的摩尔比称取或量取芳香胺(I)、盐酸、及NaNO2，将取好的芳香胺(I)、盐酸、及NaNO2置于反应器中，搅拌混合，在0～5℃下反应3～5小时，再加入与芳香胺(I)的摩尔比为1～1.2的KI，在25℃下反应1～5小时，可得到产物碘苯(II)；
所述步骤1的反应式如下：
Figure PCTCN2015098621-appb-000020
步骤2、按照碘苯(II)：丙烯酸＝1：(2～3)的摩尔比称取或量取上述步骤1制得的碘苯(II)、及丙烯酸，将取好的碘苯(II)、及丙烯酸溶解于溶剂中，采用金属钯作为催化剂，在100℃下反应15～25小时，即可得到化合物(III)；
具体的，所述步骤2中，所述溶剂可以为N-甲基吡咯烷酮。
所述步骤2的反应式如下：
Figure PCTCN2015098621-appb-000021
对得到的化合物(III)进行核磁共振分析，得到的核磁共振数据为：δ＝0.96(3H)，δ＝1.33(2H)，δ＝1.29(2H)，δ＝1.62(2H)，δ＝2.55(2H)，δ＝7.18(2H)，δ＝7.43(2H)，δ＝7.54(4H)，7.43(2H)，δ＝7.36(2H)，δ＝7.61(1H)，δ＝6.41(1H)，δ＝11.0(1H)，从而确定该化合物(III)的结构式为
Figure PCTCN2015098621-appb-000022
具体实施例Ⅱ：
化合物
Figure PCTCN2015098621-appb-000023
的制备方法：
步骤1、按照芳香腈(IV)：LiAlH4＝1：(1～3)的摩尔比称取芳香腈(IV)与LiAlH4，按照按照芳香腈(IV)：THF＝1：3(单位比为mol：L)量取四氢呋喃(THF)，将取好的芳香腈(IV)与LiAlH4溶解于四氢呋喃中；然后在72℃下采用加热回流的方式进行反应1～5小时，然后按照V(NaOH)/V(THF)＝2/1的体积比加入含有20wt％氢氧化钠的冰水溶液继续反应，即可得到芳香胺(V)；
所述步骤1的反应式如下：
Figure PCTCN2015098621-appb-000024
步骤2、按照芳香胺(V)：HCl：NaNO2＝1：(1～5)：(1.01～1.10)的摩尔比称取或量取上述步骤1制得的芳香胺(V)、盐酸、及NaNO2，将取好的芳香胺(V)、盐酸、及NaNO2置于反应器中，搅拌混合，在0～5℃下反应3～5小时，再在加入与芳香胺(V)的摩尔比为1～1.2的KI，在25℃下反应1～5小时，可得到产物碘苯(VI)；
所述步骤2的反应式如下：
Figure PCTCN2015098621-appb-000025
步骤3、按照碘苯(VI)：丙烯酸＝1:(2～3)的摩尔比称取或量取上述步骤2制得的碘苯(VI)、及丙烯酸，将取好的碘苯(VI)、及丙烯酸溶解于溶剂中，采用金属钯作为催化剂，在100℃下反应15～25小时，即可得到化合物(VII)；
具体的，所述步骤3中，所述溶剂可以为N-甲基吡咯烷酮。
所述步骤3的反应式如下：
Figure PCTCN2015098621-appb-000026
Figure PCTCN2015098621-appb-000027
对得到的化合物(VII)进行核磁共振分析，得到的核磁共振数据为：δ＝0.96(3H)，δ＝1.33(2H)，δ＝1.29(2H)，δ＝1.62(2H)，δ＝2.55(2H)，δ＝7.18(2H)，δ＝7.43(2H)，δ＝7.54(4H)，δ＝7.43(2H)，δ＝7.36(2H)，δ＝7.61(1H)，δ＝6.41(1H)，δ＝11.0(1H)，从而确定该化合物(VII)的结构式为
Figure PCTCN2015098621-appb-000028
综上所述，本发明提供一种反应型垂直取向材料、液晶显示面板、及液晶配向方法，所述反应型垂直取向材料的结构通式为A-Z-R，其中，头部基团A的作用主要是锚固作用，一方面可依靠-COOH基团以物理作用的方式锚定在基板表面，另一方面可依靠或-CH＝CH-基团与反应性单体(RM)反应进一步增强锚定液晶分子的能力；中间基团Z和尾部基团R可以起到类似于PI支链的作用，以立体障碍的方式使得液晶分子垂直取向；从而使得采用该反应型垂直取向材料的液晶显示面板可以不使用配向膜，不仅可以简化TFT-LCD的制程，而且还大大降低了TFT-LCD的生产成本；所述液晶配向方法简单，液晶配向效果好。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种反应型垂直取向材料，其结构通式为A-Z-R，其中，
    A指的是-CH＝CH-COOH；
    Z指的是
    Figure PCTCN2015098621-appb-100001
    其中n≥1；
    R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团。
  2. 如权利要求1所述的反应型垂直取向材料，其中，该反应型垂直取向材料的结构式为：
    Figure PCTCN2015098621-appb-100002
  3. 一种液晶显示面板，包括相对设置的第一、第二基板、夹设于第一、第二基板之间的液晶层、设于所述第一基板朝向液晶层一侧表面的第一电极、及设于所述第二基板朝向液晶层一侧表面的第二电极；所述液晶层包括液晶分子、反应型垂直取向材料、及在紫外光照射下与反应型垂直取向材料发生聚合反应的反应性单体；
    所述反应型垂直取向材料的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
    Figure PCTCN2015098621-appb-100003
    其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、 或者该烷基中的某个H原子被F、或Cl原子取代的基团。
  4. 如权利要求3所述的液晶显示面板，其中，该反应型垂直取向材料的结构式为：
    Figure PCTCN2015098621-appb-100004
  5. 如权利要求3所述的液晶显示面板，其中，所述反应性单体为以下四种化合物中的一种或多种：
    Figure PCTCN2015098621-appb-100005
  6. 如权利要求3所述的液晶显示面板，其中，所述液晶层中，所述反应型垂直取向材料的含量为0.1～5wt％；所述反应性单体的含量为0.01～0.1wt％。
  7. 如权利要求3所述的液晶显示面板，其中，所述第一、第二基板分别为CF基板与TFT基板；所述第一电极与第二电极分别为公共电极与像素电极。
  8. 一种液晶配向方法，包括以下步骤：
    步骤1、提供一液晶显示面板，包括相对设置的第一、第二基板、夹设于第一、第二基板之间的液晶层、设于所述第一基板朝向液晶层一侧表面的第一电极、及设于所述第二基板朝向液晶层一侧表面的第二电极；所述液晶层包括液晶分子、反应型垂直取向材料、及在紫外光照射下与反应型 垂直取向材料发生聚合反应的反应性单体；
    所述反应型垂直取向材料的结构通式为A-Z-R，其中，A指的是-CH＝CH-COOH；Z指的是
    Figure PCTCN2015098621-appb-100006
    其中n≥1；R指的是具有5～20个C原子的直链或支链化的烷基、该烷基中的某个CH2基团被苯基、环烷基、-CONH-、-COO-、-O-CO-、-S-、、-CO-或-CH＝CH-所取代的基团、或者该烷基中的某个H原子被F或Cl原子所取代的基团；
    步骤2、通过第一电极与第二电极对液晶层两侧施加电压，使液晶分子发生偏转；
    步骤3、继续对液晶层两侧施加电压的同时，对液晶显示面板照射UV光，使得反应型垂直取向材料与反应性单体在第一、第二基板表面聚合，以达到锚定液晶分子的目的；
    步骤4、停止对液晶层两侧施加电压，使得液晶分子产生预倾角。
  9. 如权利要求8所述的液晶配向方法，其中，所述步骤1提供的液晶显示面板中，所述液晶层中，所述反应型垂直取向材料的含量为0.1～5wt％；所述反应性单体的含量为0.01～0.1wt％。
  10. 如权利要求8所述的液晶配向方法，其中，所述步骤2与步骤3中，对液晶层两侧施加的电压的大小为15～25V；所述步骤3中，对液晶显示面板照射的UV光的强度为50～85mW/cm2；所述UV光的波长为365nm。
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