WO2014008747A1 - 诱导液晶排列的纳米粒子、方法、液晶显示面板及显示装置 - Google Patents

诱导液晶排列的纳米粒子、方法、液晶显示面板及显示装置 Download PDF

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WO2014008747A1
WO2014008747A1 PCT/CN2012/087114 CN2012087114W WO2014008747A1 WO 2014008747 A1 WO2014008747 A1 WO 2014008747A1 CN 2012087114 W CN2012087114 W CN 2012087114W WO 2014008747 A1 WO2014008747 A1 WO 2014008747A1
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liquid crystal
silica nanoparticles
crystal display
display panel
nanoparticles
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French (fr)
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郭仁炜
陈东
谢建云
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Beijing BOE Optoelectronics Technology Co Ltd
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Beijing BOE 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
    • 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
    • C09K19/40—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, metals
    • C09K19/406—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen or sulfur, e.g. silicon, metals containing silicon
    • 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
    • C09K2019/523—Organic solid particles
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/02—Alignment layer characterised by chemical composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]

Definitions

  • the present invention relates to nanoparticles, methods, liquid crystal display panels and display devices for inducing multi-dimensional electric field mode liquid crystal alignment. Background technique
  • Multi-domain Vertical Alignment (MVA) mode uses vertical orientation. technology.
  • the ADS mode forms a multi-dimensional electric field by the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer, so that all the aligned liquid crystal molecules between the slit electrodes in the liquid crystal cell and directly above the electrode can be The rotation is generated, thereby improving the liquid crystal working efficiency and increasing the light transmission efficiency.
  • ADS mode technology can improve the picture quality of TFT-LCD (Thin Film Transistor-Liquid Crystal Display) products, with high resolution, high transmittance, low power consumption, wide viewing angle, high aperture ratio, low chromatic aberration
  • TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • the advantages of non-extrusion water ripple (push Mura) have extremely high application value in the field of liquid crystal display, wherein the induction of liquid crystal regular alignment has an important influence on the display effect of the liquid crystal display panel.
  • silica nanoparticles have been used to induce liquid crystal alignment.
  • the surface tension of the silica nanoparticles is mainly used to induce liquid crystal alignment, and the induction force on the liquid crystal molecules is weak; Because silica nanoparticles are prone to agglomeration and are inorganic, their dispersibility in liquid crystals is poor, thus enabling The silicon oxide nanoparticles cannot effectively induce the alignment of the liquid crystals, thereby failing to improve the liquid crystal display effect. Summary of the invention
  • the present invention provides a nanoparticle for inducing a multi-dimensional electric field mode liquid crystal alignment, the nanoparticle being a silica nanoparticle modified with an organosilicon compound of the formula (1),
  • R may be the same or different -H or -OC 2 H 5 ; preferably, R is the same as H or -OC 2 H 5 ; more preferably, R is H;
  • n is an integer from 1 to 10.
  • R is the same as -H or -OC 2 3 ⁇ 4. More preferably, R is H
  • the silica nanoparticles have a particle diameter of from 100 to 200 nm.
  • the liquid crystal alignment is induced using the nanoparticles as described above.
  • the method specifically includes the following steps:
  • the silica nanoparticles are mixed with the organosilicon compound of the formula (1) and a solvent, and then stirred at 60 to 80 ° C for 24-100 h.
  • the mass fraction of the liquid crystal is 90-99%, and the mass fraction of the modified silica nanoparticles is 1-10%.
  • the present invention further provides a liquid crystal display panel which induces liquid crystal alignment using the nanoparticles as described above.
  • the present invention further provides a liquid crystal display device comprising the liquid crystal display panel as described above.
  • the present invention further provides the use of the silica compound-modified silica nanoparticles for liquid crystal display panels, particularly for inducing liquid crystal alignment, e.g., inducing multi-dimensional electric field mode liquid crystal alignment.
  • the method for inducing liquid crystal alignment by utilizing organosilicon compound-modified silica nanoparticles has the following advantages: 1.
  • the organosilicon compound for modifying silica nanoparticles of the present invention contains a benzene ring.
  • a rigid group such as biphenyl and/or cyclohexane can effectively induce the alignment of the liquid crystal, thereby improving the display effect of the ADS mode liquid crystal display panel;
  • the invention is used for modifying the organosilicon compound of the silica nanoparticle.
  • the modified silica nanoparticles and liquid crystals Containing rigid groups and flexible chains, similar to the structure of the nematic liquid crystal molecules used in the ADS mode, the modified silica nanoparticles and liquid crystals have good compatibility, which contributes to the modified silica.
  • the nanoparticles are uniformly dispersed in the liquid crystal, thereby facilitating the improvement of the display effect of the ADS mode liquid crystal display panel. 3.
  • the driving voltage of the liquid crystal display panel can be lowered, thereby To reduce the role of energy consumption.
  • FIG. 1 is a micrograph of a modified silica nanoparticle mixed with a liquid crystal according to the present invention
  • FIG. 2 is a schematic diagram of the modified silica nanoparticle-induced liquid crystal alignment of the present invention
  • FIG. 3 is a modified view of the present invention.
  • FIG. 4 is a schematic diagram of an ADS mode liquid crystal display panel of FIG. 3 after applying an electric field;
  • FIG. 5 is a method step of inducing liquid crystal alignment by using the nanoparticles of the present invention.
  • Fig. 6 is a V-T curve test chart of the ADS mode liquid crystal display panel before and after the addition of the modified silica nanoparticles of the present invention.
  • the central idea of the present invention is to: modify the silica nanoparticles by using an organosilicon compound having a structure similar to that of the nematic liquid crystal molecules in the ADS mode, so that the modified silica nanoparticles are uniformly dispersed in the liquid crystal, and the organosilicon compound Containing rigid groups such as benzene rings, biphenyls and/or cyclohexyl groups,
  • the arrangement of the liquid crystals can be effectively induced, thereby improving the display effect of the ADS mode liquid crystal display panel.
  • the present invention provides a nanoparticle for inducing ADS mode liquid crystal alignment, the nanoparticle being a silica nanoparticle modified with an organosilicon compound of the formula (1),
  • R may be the same or different, respectively -H or -OC 2 3 ⁇ 4; preferably, R is the same as H or -OC 2 3 ⁇ 4; more preferably, R is H;
  • n is an integer from 1 to 10.
  • R is the same as H or -OC 2 H 5 . More preferably, R is H.
  • the hydroxyl group on the surface of the silica nanoparticles and the organosilicon compound of the formula (1) are reacted as shown in the formula (2), whereby the organic compound can be modified.
  • the terminal group does not contain an electron-withdrawing group, and this structure is similar to the structure of a nematic liquid crystal molecule used in the ADS mode, according to similar compatibility Principle of the invention
  • the silica nanoparticles have good compatibility with the liquid crystal, and can avoid the agglomeration of the silica nanoparticles in the liquid crystal, thereby facilitating the uniform dispersion of the silica nanoparticles in the liquid crystal.
  • Figure 1 is a micrograph of the modified silica nanoparticles and liquid crystals of the present invention (using a transmission electron microscope TEM, magnified 20000 times, FEI, NNL 2000), and the modified silica is shown in the figure.
  • the nanoparticles are uniformly distributed in the liquid crystal, and no agglomeration occurs. Therefore, the silica nanoparticles modified by the organosilicon compound represented by the formula (1) of the present invention can be uniformly dispersed in the liquid crystal, which is advantageous for improving the ADS mode.
  • the LCD panel displays the effect.
  • the surface of the modified silica nanoparticles of the present invention has a siloxane rod-like organic substance, and the liquid crystal can be induced to be aligned according to the long axis by the influence of the intermolecular boundary effect, thereby effectively inducing the alignment of the liquid crystal, thereby improving the ADS mode liquid crystal display.
  • Fig. 2 is a schematic view showing the alignment of the silica nanoparticles induced by the modified silica particles of the present invention.
  • the alignment direction of the liquid crystal molecules 3 coincides with the long axis direction of the organic substance 12 on the surface of the modified silica nanoparticles 4; after the voltage is applied, the electric field direction of the ADS mode is as indicated by the arrow 14 It is shown that the long axis direction of the liquid crystal molecules 3 is deflected and deflected to be aligned in the direction of the electric field; after the voltage is removed, the organic substance 12 on the surface of the modified silica nanoparticles contains a benzene ring, a biphenyl group, and/or a cyclohexyl group.
  • the rigid group makes it easier for the liquid crystal molecules 3 to be restored to the initial state by the boundary effect of the organic substance 12, that is, aligned in a direction coinciding with the long axis direction of the organic substance 12, thereby enabling the liquid crystal molecules 3 to be regularly arranged.
  • Fig. 3 is a schematic view showing the state in which the modified silica nanoparticles of the present invention are mixed with a liquid crystal and then added to an ADS mode liquid crystal display panel.
  • the color filter substrate 1 is coated with a first planar alignment layer 2
  • the array substrate 9 is provided with a pixel electrode 8, an insulating layer 7, a common (COM) electrode 6, and a second planar alignment layer 5 in this order from bottom to top.
  • the modified silica nanoparticles 4 and the liquid crystal molecules 3 are filled between the first planar alignment layer 2 of the color filter substrate 1 and the second planar alignment layer 5 of the array substrate 9.
  • the long axis of the liquid crystal molecules 3 is aligned parallel to the substrate, and the modified silica nanoparticles 4 are uniformly dispersed in the liquid crystal molecules 3.
  • FIG. 4 is a schematic diagram of the ADS mode liquid crystal display panel of FIG. 3 after an electric field is applied. As seen from the figure, after energization, the liquid crystal molecules 3 are arranged along the direction of the electric field (direction indicated by the arrow 13), and the terminal groups of the organic substance 12 on the surface of the modified silica nanoparticles 4 do not contain the electric absorbing group. Group, so there is no spatial movement under the electric field.
  • the liquid crystal molecules 3 need to be restored to the state in which the long axis of the liquid crystal molecules is parallel to the substrate, and then the modified silica nanoparticles are
  • the rod-shaped organic substance induces the arrangement of the peripheral liquid crystal molecules parallel to the array substrate 9 and the color filter substrate 1, so that the alignment direction of the liquid crystal molecules can be effectively controlled by the modified silica nanoparticles.
  • the effect on the orientation of the nematic liquid crystal is different.
  • the molecular rigidity is poor, and the induction effect on the liquid crystal is small; the rigidity of the benzene ring, biphenyl, cyclohexane, etc. in the organosilicon compound
  • the molecular rigidity is strong, and the effect on the liquid crystal is large.
  • the length of the flexible chain in the organosilicon compound used in the modification of the silica nanoparticles of the present invention affects the dispersibility of the silica nanoparticles in the liquid crystal.
  • the longer the flexible chain the better the dispersibility of the silica compound-modified silica nanoparticles in the liquid crystal; the shorter the flexible chain, the worse the dispersibility of the organosilicon compound-modified silica nanoparticles in the liquid crystal.
  • the particle size of the silica nanoparticles of the present invention is 100-200 nm, and the particle size of the silica nanoparticles also affects the dispersibility of the silica nanoparticles in the liquid crystal.
  • the surface is The more hydroxyl groups, the more groups that react with the organosilicon compound, the better the dispersion effect in the liquid crystal, but when the silica nanoparticles are too large, the inorganic material is too large to be easily soluble with the liquid crystal molecules;
  • the silica nanoparticles are too small, the fewer hydroxyl groups on the surface, and the fewer groups reacting with the organosilicon compound, the less silica-like organic substances on the surface of the modified silica nanoparticles, thereby reducing the ability to induce alignment of the liquid crystal. .
  • the present invention further provides a method of inducing liquid crystal alignment in an ADS mode, which induces liquid crystal alignment by using the above-described nanoparticles which induce liquid crystal alignment of the ADS mode.
  • the method for inducing the liquid crystal alignment of the ADS mode may further include the following steps (as shown in FIG. 5):
  • liquid crystal and the modified silica nanoparticles are mixed at a certain mass ratio to induce liquid crystal alignment.
  • the present invention further provides a liquid crystal display panel which induces liquid crystal alignment using the nanoparticles as described above.
  • the following steps are further included (as shown in FIG. 5): c) placing the mixture obtained in the step b) into a defoamer for defoaming treatment; d) dropping the mixture obtained in the step c) onto the array substrate, applying the sealant to the color filter substrate and/or the array substrate, and then aligning the color filter substrate and the array substrate under vacuum to obtain a liquid crystal Display panel
  • the silica nanoparticles are mixed with the organosilicon compound of the formula (1) and a solvent, and then stirred at 60 to 80 ° C for 24-100 hours, and after the reaction is completed, the rotary evaporation can be carried out under reduced pressure.
  • the mixed solvent was spin-dried, and the obtained solid matter was washed with ethanol to remove the unreacted organosilicon compound, and the washed solid matter was dried to obtain modified silica nanoparticles.
  • the solvent used in this step may be an organic solvent commonly used in the art.
  • the solvent in the present invention is preferably a mixed solvent of acetone, tetrahydrofuran, ethanol and water, more preferably a mixed solvent of acetone, tetrahydrofuran, water and ethanol in a volume ratio of 2:1:2:1.
  • the mass fraction of the liquid crystal is 90 to 99%, and the mass fraction of the modified silica nanoparticles is 1-10%.
  • the defoaming treatment time in the above step c) is preferably from 1 to 10 hours.
  • the planar alignment layer is coated on the color filter substrate and the array substrate, and the flanking cloth is used to rub the orientation, and then the mixture obtained in the step c) is dropped onto the array substrate to perform a vacuum box;
  • the liquid crystal display panel can be irradiated by using the existing common conditions, preferably the ultraviolet light has a wavelength of 350-380 nm, the ultraviolet light irradiation time is l-60 min, and the ultraviolet light irradiation intensity is 0.1-100 mW. /cm 2 .
  • the liquid crystal display panel can be heated by using the conventionally used conditions, preferably at 90-150 ° C for l-3 h.
  • the present invention further provides a liquid crystal display device comprising the above liquid crystal display panel, wherein the liquid crystal display panel contains the nanoparticles in which the ADS mode liquid crystal alignment is induced.
  • the present invention also provides the use of silica nanoparticles modified by the organosilicon compound of formula (1) in liquid crystal display panels, particularly in inducing liquid crystal alignment, such as inducing ADS mode liquid crystal alignment.
  • a silica nanoparticle having an lg particle diameter in the range of 100 to 200 nm and 3 g of an organosilicon compound of the formula (1) (the organosilicon compound of the formula (1) used in Example 1 is shown in Table 1;
  • the product obtained by ALDRICH is dissolved in 30 ml of a mixed solvent consisting of 10 ml of acetone, 5 ml of tetrahydrofuran, 10 ml of water and 5 ml of ethanol.
  • the silica nanoparticles, the organosilicon compound and the solvent are mixed and stirred at 70 ° C for 48 h.
  • the mixed solvent was spin-dried by a vacuum rotary evaporator, and the obtained solid matter was washed with ethanol to remove the unreacted organosilicon compound, and the washed solid matter was dried to obtain modified silica nanoparticles. ;
  • step c) placing the mixture obtained in step b) into a defoamer for defoaming treatment for 1 hour; d) coating the planar alignment layer on the color filter substrate and the array substrate, rubbing the orientation with a fleece, and then obtaining step c) The mixture is added onto the array substrate, the sealant is coated on the color filter substrate, and the color filter substrate and the array substrate are placed under vacuum to obtain a liquid crystal display panel;
  • the ultraviolet light has a wavelength of 350 nm, the ultraviolet light irradiation time is 1 min, and the ultraviolet light irradiation intensity is 100 mW/cm 2 ;
  • step f) heating the liquid crystal display panel obtained in step e) at 135 ° C for 1.5 h to obtain a liquid crystal display panel
  • the mixed solvent is spin-dried by a vacuum rotary evaporator, and the obtained solid substance is washed with ethanol to remove the unreacted organosilicon compound, and the washed solid substance is dried to obtain modified silica nanoparticles;
  • step b) mixing the liquid crystal and the modified silica nanoparticles according to a certain mass ratio, wherein the mass fraction of the liquid crystal is 97%, and the mass fraction of the modified silica nanoparticles is 3%; c) placing the mixture obtained in step b) into a defoamer for defoaming treatment for 3 hours; d) coating the planar alignment layer on the color filter substrate and the array substrate, rubbing the orientation with a fleece, and then obtaining step c) The mixture is added onto the array substrate, the sealant is coated on the color filter substrate, and the color filter substrate and the array substrate are placed under vacuum to obtain a liquid crystal display panel;
  • the ultraviolet light has a wavelength of 365 nm, the ultraviolet light irradiation time is 10 min, and the ultraviolet light irradiation intensity is 80 mW/cm 2 ;
  • step f) heating the liquid crystal display panel obtained in step e) at 100 ° C for 2.5 h to obtain a liquid crystal display panel
  • a) 2 g of silica nanoparticles having a particle diameter in the range of 100 to 200 nm and 3.5 g of the organosilicon compound of the formula (1) (the organosilicon compound of the formula (1) used in Example 3 is shown in Table 1; from ALDRICH The commercially available solution was dissolved in 30 ml of a mixed solvent consisting of 10 ml of acetone, 5 ml of tetrahydrofuran, 10 ml of water and 5 ml of ethanol. The silica nanoparticles, the organosilicon compound and the solvent were mixed and stirred at 80 ° C for 24 h.
  • the mixed solvent is spin-dried by a vacuum rotary evaporator, and the obtained solid substance is washed with ethanol to remove the unreacted organosilicon compound, and the washed solid substance is dried to obtain modified silica nanoparticles;
  • step c) placing the mixture obtained in step b) into a defoamer for defoaming treatment for 6 hours; d) coating the planar alignment layer on the color filter substrate and the array substrate, rubbing the orientation with a flannel, and then obtaining step c) The mixture is added onto the array substrate, the sealant is coated on the color filter substrate, and the color filter substrate and the array substrate are placed under vacuum to obtain a liquid crystal display panel;
  • the ultraviolet light has a wavelength of 370 nm, the ultraviolet light irradiation time is 25 min, and the ultraviolet light irradiation intensity is 55 mW/cm 2 ;
  • the mixed solvent is spin-dried by a vacuum rotary evaporator, and the obtained solid substance is washed with ethanol to remove the unreacted organosilicon compound, and the washed solid substance is dried to obtain modified silica nanoparticles;
  • step c) placing the mixture obtained in step b) into a defoamer for defoaming treatment for 8 hours; d) coating the planar alignment layer on the color filter substrate and the array substrate, rubbing the orientation with a flannel, and then obtaining step c) The mixture is added onto the array substrate, the sealant is coated on the color filter substrate, and the color filter substrate and the array substrate are placed under vacuum to obtain a liquid crystal display panel;
  • the ultraviolet light has a wavelength of 360 nm, the ultraviolet light irradiation time is 40 min, and the ultraviolet light irradiation intensity is 20 mW/cm 2 ;
  • the mixed solvent is spin-dried by a vacuum rotary evaporator, and the obtained solid substance is washed with ethanol to remove the unreacted organosilicon compound, and the washed solid substance is dried to obtain modified silica nanoparticles;
  • step c) placing the mixture obtained in step b) into a defoamer for defoaming treatment for 10 hours; d) coating the planar alignment layer on the color filter substrate and the array substrate, rubbing the orientation with a flannel, and then obtaining step c) The mixture is added onto the array substrate, the sealant is coated on the color filter substrate, and the color filter substrate and the array substrate are placed under vacuum to obtain a liquid crystal display panel;
  • the liquid crystal is filled into the liquid crystal cell alone (refer to step cf in the specific embodiment) to obtain a liquid crystal display panel 0, and a voltage is applied to the liquid crystal display panel 0 and the liquid crystal display panel 2 obtained in the second embodiment, respectively.
  • the instrument (LCT-5016C, Changchun Liancheng Instrument Co., Ltd., He-Ne source, wavelength 632.8nm, voltage 220V) was tested for its drive voltage-temperature (VT) curve.
  • the structural formula of the organosilicon compound for modifying the silica nanoparticles in Examples 1-5 is listed in Table 1.
  • 6 is a VT curve test chart of a liquid crystal display panel 0 obtained by adding the modified silica nanoparticles of the present invention and a silica nanoparticle obtained by adding the modified silica nanoparticles of the present invention, which can be seen from the figure.
  • the maximum driving voltage of the liquid crystal display panel is 9.72 V
  • the maximum driving voltage drop of the liquid crystal display panel is added after the modified silica nanoparticles are added. Up to 8.85 V, it is explained that the addition of the modified silica nanoparticles to the liquid crystal is advantageous in reducing the driving voltage of the liquid crystal display panel, thereby reducing the energy consumption.
  • the present invention uses a silicone compound similar in structure to the nematic liquid crystal molecules in the ADS mode to modify the silica nanoparticles, so that the modified silica nanoparticles are dispersed in the liquid crystal.
  • the organosilicon compound contains a rigid group such as a benzene ring, a biphenyl group and/or a cyclohexyl group, which can effectively induce the alignment of the liquid crystal, thereby improving the display effect of the ADS mode liquid crystal display panel and adding it to the liquid crystal.
  • the silica nanoparticles it is advantageous to reduce the driving voltage of the liquid crystal display panel, thereby reducing the energy consumption.

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Description

诱导液晶排列的纳米粒子、 方法、 液晶显示面板及显示装置 技术领域
本发明涉及诱导多维电场模式液晶排列的纳米粒子、 方法、 液晶显示面 板及显示装置。 背景技术
液晶显示领域中， 通过对基板表面进行处理， 可以诱导液晶规则取向排 歹^ 才艮据液晶分子在液晶显示面板中取向方向的不同， 可以分为平面取向和 垂直取向。 当在基板上涂覆平面取向层， 经过摩擦后， 液晶分子长轴会平行 于基板排列， 从而形成液晶分子的平面取向； 当基板表面涂覆垂直取向层， 经热处理后， 液晶分子长轴会垂直于基板方向排列， 从而形成液晶分子的垂 直取向。 根据不同的液晶取向方法， 在液晶显示领域出现了很多显示模式。 例如扭曲向列型（TN, Twisted Nematic)及多维电场 (ADS , ADvanced Super Dimension Switch)等模式大多使用的是平面取向技术， 多畴垂直取向 (MVA, Multi-domain Vertical Alignment)模式多使用垂直取向技术。 通过改变液晶显 示面板中的液晶取向方法， 能开发出许多新颖的液晶显示模式， 如何人为控 制液晶分子排列是液晶行业面临的新的挑战。
ADS模式通过同一平面内狭缝电极边缘所产生的电场以及狭缝电极层 与板状电极层间产生的电场形成多维电场， 使液晶盒内狭缝电极间、 电极正 上方所有取向液晶分子都能够产生旋转， 从而提高了液晶工作效率并增大了 透光效率。 ADS模式技术可以提高薄膜晶体管液晶显示器 (TFT-LCD, Thin Film Transistor-Liquid Crystal Display)产品的画面品质， 具有高分辨率、 高透 过率、 低功耗、 宽视角、 高开口率、 低色差、 无挤压水波紋 (push Mura)等优 点， 在液晶显示领域具有极高的应用价值， 其中诱导液晶规则排列对液晶显 示面板的显示效果具有重要的影响。 现有技术中， 已有研究将二氧化硅纳米 粒子用于诱导液晶排列， 该过程中， 主要利用二氧化硅纳米粒子的表面张力 诱导液晶定向排列， 对液晶分子的诱导作用力较弱； 另外， 由于二氧化硅纳 米粒子易发生团聚， 且为无机物， 使得其在液晶中的分散性较差， 从而使二 氧化硅纳米粒子不能有效地诱导液晶定向排列， 从而达不到改善液晶显示效 果的目的。 发明内容
有鉴于此， 本发明的主要目的在于提供一种诱导 ADS模式液晶排列的 纳米粒子、 方法、 液晶显示面板及显示设备。
为了达到上述目的， 本发明的技术方案是这样实现的：
本发明提供一种诱导多维电场模式液晶排列的纳米粒子， 所述纳米粒子 为利用式 (1)的有机硅化合物修饰的二氧化硅纳米粒子，
Figure imgf000004_0001
其中， R可以相同或不同地为 -H或 -OC2H5; 优选， R相同地均为 H或 -OC2H5; 更优选地， R均为 H;
M 一种：
Figure imgf000004_0002
其中， n为 1-10的整数。
优选地， R相同地为 -H或 -OC2¾。 更优选地， R均为 H
优选地， 所述二氧化硅纳米粒子的粒径为 100-200nm。
优选地， 利用如上所述的纳米粒子诱导液晶排列。 优选地， 所述方法具体包括如下步骤：
a)将二氧化硅纳米粒子与式 (1)的有机硅化合物及溶剂混合并搅拌， 反应 完成后， 除去溶剂得到修饰的二氧化硅纳米粒子；
b)将液晶及修饰的二氧化硅纳米粒子混合， 以诱导液晶排列。
优选地， 所述步骤 a)中将二氧化硅纳米粒子与式 (1)的有机硅化合物及溶 剂混合后， 在 60-80 °C搅拌 24-100h。
优选地， 所述步骤 b)的混合物中， 液晶的质量分数为 90-99%,修饰的二 氧化硅纳米粒子的质量分数为 1-10%。
本发明进一步提供一种液晶显示面板， 所述液晶显示面板利用如上所述 的纳米粒子诱导液晶排列。
本发明进一步提供一种液晶显示装置， 所述装置包括如上所述的液晶显 示面板。
本发明进一步提供了利用所述有机硅化合物修饰的二氧化硅纳米粒子在 液晶显示面板、 特别是诱导液晶排列例如诱导多维电场模式液晶排列中的用 途。
与现有技术相比， 本发明利用有机硅化合物修饰的二氧化硅纳米粒子诱 导液晶排列的方法， 具有以下优点： 一、 本发明用于修饰二氧化硅纳米粒子 的有机硅化合物中含有苯环、联苯和 /或环己烷等刚性基团， 能够有效地诱导 液晶的排列， 从而改善 ADS模式液晶显示面板的显示效果； 二、 本发明用 于修饰二氧化硅纳米粒子的有机硅化合物中含有刚性基团及柔性链，与 ADS 模式中釆用的向列相液晶分子的结构相似， 使得修饰后的二氧化硅纳米粒子 和液晶的相溶性较好，有助于修饰后的二氧化硅纳米粒子在液晶中分散均匀， 从而有利于改善 ADS模式液晶显示面板的显示效果； 三、 在液晶中加入本 发明修饰后的二氧化硅纳米粒子后， 能够降低液晶显示面板的驱动电压， 从 而起到降低能耗的作用。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。 图 1为本发明修饰后的二氧化硅纳米粒子与液晶混合后的显微镜图片； 图 2为本发明修饰后的二氧化硅纳米粒子诱导液晶排列的原理图； 图 3 为将本发明修饰后的二氧化硅纳米粒子与液晶混合后添加到 ADS 模式液晶显示面板后通电前的原理图；
图 4为图 3中的 ADS模式液晶显示面板施加电场后的原理图； 图 5为利用本发明的纳米粒子诱导液晶排列的方法步骤；
图 6为 ADS模式液晶显示面板中加入本发明修饰后的二氧化硅纳米粒 子前后的 V-T曲线测试图。
附图标记说明
1彩膜基板
2第一平面取向层
3液晶分子
4修饰后的二氧化硅纳米粒子
5第二平面取向层
6公共 (COM)电极
7绝缘层
8像素 (Pixel)电极
9阵列基板
12有机物
13、 14箭头 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
本发明的中心思想在于： 釆用与 ADS模式中向列相液晶分子结构相似 的有机硅化合物修饰二氧化硅纳米粒子， 使修饰后的二氧化硅纳米粒子在液 晶中分散均匀， 且有机硅化合物中含有苯环、 联苯和 /或环己基等刚性基团， 能够有效地诱导液晶的排列， 从而改善 ADS模式液晶显示面板的显示效果。 本发明提供一种诱导 ADS模式液晶排列的纳米粒子， 该纳米粒子为利 用式 (1)的有机硅化合物修饰的二氧化硅纳米粒子，
Figure imgf000007_0001
其中， R可以相同或不同地分别为 -H或 -OC2¾; 优选， R为相同的均为 H或 -OC2¾; 更优选， R均为 H;
M 代基中的一种：
Figure imgf000007_0002
其中， n为 1-10的整数。 其中， 优选所有 R均相同地为 H或 -OC2H5。 更优选， R均为 H。
将二氧化硅纳米粒子与式 (1)的有机硅化合物混合后， 二氧化硅纳米粒子 表面的羟基与式 (1)的有机硅化合物发生式 (2)的所示反应，从而可将有机物修 饰到
Figure imgf000007_0003
基等刚性基团和柔性链 (-(C¾)n-CH3), 端基不含吸电基团， 这种结构与 ADS 模式釆用的向列相液晶分子的结构相似， 根据相似相溶的原理， 本发明修饰 后的二氧化硅纳米粒子与液晶具有较好的相容性， 可避免二氧化硅纳米粒子 在液晶中发生团聚， 从而有利于二氧化硅纳米粒子在液晶中分散均匀。 图 1 为本发明修饰后的二氧化硅纳米粒子与液晶混合后的显微镜图片（釆用透射 电子显微镜 TEM, 放大 20000倍， FEI公司， NNL 2000), 从图中看出修饰 后的二氧化硅纳米粒子在液晶中分布均匀， 并且没有发生团聚现象， 由此， 本发明经式 (1)所示的有机硅化合物修饰后的二氧化硅纳米粒子能够均匀分 散在液晶中， 有利于提高 ADS模式液晶显示面板显示效果。
本发明修饰后的二氧化硅纳米粒子表面具有硅氧烷棒状有机物， 通过分 子间边界效应的影响， 能诱导液晶按照其长轴排列， 从而有效地诱导液晶的 定向排列， 从而提高 ADS模式液晶显示面板的显示效果。 图 2为本发明修 饰后的二氧化硅纳米粒子诱导液晶排列的原理图。 从图中可以看出， 未施加 电压时， 液晶分子 3的排列方向与修饰后的二氧化硅纳米粒子 4表面的有机 物 12的长轴方向一致； 施加电压后， ADS模式电场方向如箭头 14所示， 液 晶分子 3的长轴方向发生偏转， 并偏转至沿电场方向排列； 去电压后， 由于 修饰后的二氧化硅纳米粒子表面的有机物 12中含有苯环、 联苯和 /或环己基 等刚性基团，使得液晶分子 3受有机物 12边界效应的影响更容易恢复到初始 状态， 即沿与有机物 12的长轴方向一致的方向排列，从而能够诱导液晶分子 3规则排列。
图 3 为将本发明修饰后的二氧化硅纳米粒子与液晶混合后添加到 ADS 模式液晶显示面板后通电前的原理图。 如图 3所示， 彩膜基板 1上涂覆有第 一平面取向层 2, 阵列基板 9从下至上依次设置像素电极 8、 绝缘层 7、 公共 (COM)电极 6及第二平面取向层 5, 修饰后的二氧化硅纳米粒子 4与液晶分 子 3填充在彩膜基板 1的第一平面取向层 2与阵列基板 9的第二平面取向层 5之间。 当液晶显示面板内侧经平面取向时， 液晶分子 3的长轴平行于基板 排列， 修饰后的二氧化硅纳米粒子 4均匀分散在液晶分子 3中。
图 4为图 3中的 ADS模式液晶显示面板施加电场后的原理图。 从图中 看出， 通电后， 液晶分子 3会沿着电场方向 (箭头 13所示方向)发生排列， 修 饰后的二氧化硅纳米粒子 4表面的有机物 12的端基基团不含有吸电基团，所 以在电场下自身不会发生空间上的移动， 当撤去电场时， 液晶分子 3需要恢 复至液晶分子长轴平行于基板的状态， 这时修饰后的二氧化硅纳米粒子上的 棒状有机物会诱导周边液晶分子平行于阵列基板 9及彩膜基板 1排列，这样， 通过修饰的二氧化硅纳米粒子， 能够有效地控制液晶分子的排列方向。
本发明用于修饰二氧化硅纳米粒子的有机硅化合物中的苯环、 联苯、 环 己烷等刚性基团的含量不同时， 对向列相液晶诱导取向效果不同。 当有机硅 化合物中苯环、 联苯、 环己烷等刚性基团较少时， 分子刚性较差， 对液晶的 诱导作用较小； 有机硅化合物中苯环、 联苯、 环己烷等刚性基团较多时， 分 子刚性较强， 对液晶的诱导作用较大。
本发明用于修饰二氧化硅纳米粒子的有机硅化合物中的柔性链长短会影 响二氧化硅纳米粒子在液晶中的分散性。 柔性链越长时， 有机硅化合物修饰 后的二氧化硅纳米粒子在液晶中的分散性越好； 柔性链越短时， 有机硅化合 物修饰二氧化硅纳米粒子在液晶中的分散性越差。
本发明的二氧化硅纳米粒子的粒径为 100-200nm, 二氧化硅纳米粒子的 粒径也会影响二氧化硅纳米粒子在液晶中的分散性， 二氧化硅纳米粒子越大 时， 表面的羟基越多， 和有机硅化合物反应的基团越多， 在液晶中分散效果 较好， 但当二氧化硅纳米粒子过大时， 由于无机物体积过大则不易与液晶分 子相溶； 如果二氧化硅纳米粒子过小时， 表面的羟基越少， 和有机硅化合物 反应的基团越少，修饰后的二氧化硅纳米粒子表面的硅氧烷棒状有机物较少， 从而诱导液晶定向排列的能力降低。
本发明进一步提供一种诱导 ADS模式液晶排列的方法， 该方法釆用上 述诱导 ADS模式液晶排列的纳米粒子诱导液晶排列。
上述诱导 ADS模式液晶排列的方法， 进一步可具体包括以下步骤 (如图 5所示)：
a)将二氧化硅纳米粒子与式 (1)的有机硅化合物及溶剂混合并搅拌， 反应 完成后， 除去溶剂得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 以诱导液晶 排列。
本发明进一步提供一种液晶显示面板， 所述液晶显示面板利用如上所述 的纳米粒子诱导液晶排列。
进一步地， 为了制得液晶显示面板， 还包括如下步骤 (如图 5所示)： c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理； d)将步骤 c)得到的混合物滴加到阵列基板上， 将封框胶涂覆到彩膜基板 和 /或阵列基板上， 然后将彩膜基板与阵列基板在真空条件下对盒， 得到液晶 显示面板；
e)利用紫外光对液晶显示面板进行辐照；
f)将步骤 e)中得到的液晶显示面板进行加热。
具体地，在上述步骤 a)中将二氧化硅纳米粒子与式 (1)的有机硅化合物及 溶剂混合后， 在 60-80°C搅拌 24-100h, 反应完成后可釆用减压旋转蒸发器将 混合溶剂旋干， 得到的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的固体物质烘干， 即可得到修饰的二氧化硅纳米粒子。 该步骤中所 用的溶剂可为本领域常用的有机溶剂。
本发明中优选溶剂为丙酮、 四氢呋喃、 乙醇和水的混合溶剂， 更优选丙 酮、 四氢呋喃、 水和乙醇的体积比为 2: 1 : 2: 1的混合溶剂。
在上述步骤 b)中优选液晶的质量分数为 90-99%,修饰的二氧化硅纳米粒 子的质量分数为 1-10%。
在上述步骤 c)中优选脱泡处理时间为 1-10个小时。
在步骤 d)进行之前， 需要在彩膜基板和阵列基板上涂覆平面取向层， 利 用绒布摩擦取向， 然后再将步骤 c)得到的混合物滴加到阵列基板上， 进行真 空对盒；
在上述步骤 e)中可选用现有常用的条件对液晶显示面板进行辐照， 优选 紫外光的波长为 350-380nm, 紫外光辐照时间为 l-60min, 紫外光辐照强度为 0.1-100mW/cm2。
在上述步骤 f)中可选用现有常用的条件对液晶显示面板进行加热， 优选 在 90-150°C加热 l-3h。
本发明进一步提供一种液晶显示装置， 包括上述液晶显示面板， 所述液 晶显示面板中含有上述诱导 ADS模式液晶排列的纳米粒子。
本发明还提供经式 (1)有机硅化合物修饰的二氧化硅纳米粒子在液晶显 示面板、 特别是诱导液晶排列如诱导 ADS模式液晶排列中的用途。
以下为釆用本发明诱导 ADS模式液晶排列的方法制备液晶显示面板的 具体实施例。 一、 液晶显示面板的制备
实施例 1
a)将 lg粒径为在 100-200纳米的范围的二氧化硅纳米粒子与 3g式 (1)的 有机硅化合物（实施例 1中所用的式 (1)的有机硅化合物参见表 1 ;从 ALDRICH 购买获得)溶于 30ml混合溶剂中，所述混合溶剂由 10ml丙酮、 5ml四氢呋喃、 10ml水和 5ml的乙醇组成，将二氧化硅纳米粒子、有机硅化合物及溶剂混合 后在 70°C搅拌 48h, 反应完成后釆用减压旋转蒸发器将混合溶剂旋干， 得到 的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的固体物质 烘干， 得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 其中液晶的 质量分数为 99%, 修饰的二氧化硅纳米粒子的质量分数为 1%;
c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理 1小时； d)分别在彩膜基板和阵列基板上涂覆平面取向层， 利用绒布摩擦取向， 然后将步骤 c)得到的混合物滴加到阵列基板上，将封框胶涂覆到彩膜基板上， 将彩膜基板与阵列基板在真空条件下对盒， 得到液晶显示面板；
e)利用紫外光对液晶显示面板进行辐照， 其中紫外光的波长为 350nm, 紫外光辐照时间为 lmin, 紫外光辐照强度为 100mW/cm2;
f)将步骤 e)中得到的液晶显示面板在 135°C加热 1.5h,得到液晶显示面板
1。 实施例 2
a)将 1.5g粒径在 100-200纳米范围的二氧化硅纳米粒子与 4g式 (1)的有 机硅化合物（实施例 2中所用的式 (1)的有机硅化合物参见表 1 ; 从 ALDRICH 购买获得)溶于 60ml混合溶剂中， 所述混合溶剂由 20ml丙酮、 10ml四氢呋 喃、 20ml水和 10ml的乙醇组成， 将二氧化硅纳米粒子、 有机硅化合物及溶 剂混合后在 60°C搅拌 100h, 反应完成后釆用减压旋转蒸发器将混合溶剂旋 干， 得到的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的 固体物质烘干， 得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 其中液晶的 质量分数为 97%, 修饰的二氧化硅纳米粒子的质量分数为 3%; c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理 3小时； d)分别在彩膜基板和阵列基板上涂覆平面取向层， 利用绒布摩擦取向， 然后将步骤 c)得到的混合物滴加到阵列基板上，将封框胶涂覆到彩膜基板上， 将彩膜基板与阵列基板在真空条件下对盒， 得到液晶显示面板；
e)利用紫外光对液晶显示面板进行辐照， 其中紫外光的波长为 365nm, 紫外光辐照时间为 lOmin, 紫外光辐照强度为 80mW/cm2;
f)将步骤 e)中得到的液晶显示面板在 100°C加热 2.5h,得到液晶显示面板
2。 实施例 3
a)将 2g粒径在 100-200纳米范围的二氧化硅纳米粒子与 3.5g式 (1)的有 机硅化合物（实施例 3中所用的式 (1)的有机硅化合物参见表 1 ; 从 ALDRICH 购买获得)溶于 30ml混合溶剂中，所述混合溶剂由 10ml丙酮、 5ml四氢呋喃、 10ml水和 5ml的乙醇组成，将二氧化硅纳米粒子、有机硅化合物及溶剂混合 后在 80°C搅拌 24h, 反应完成后釆用减压旋转蒸发器将混合溶剂旋干， 得到 的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的固体物质 烘干， 得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 其中液晶的 质量分数为 95%, 修饰的二氧化硅纳米粒子的质量分数为 5%;
c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理 6小时； d)分别在彩膜基板和阵列基板上涂覆平面取向层， 利用绒布摩擦取向， 然后将步骤 c)得到的混合物滴加到阵列基板上，将封框胶涂覆到彩膜基板上， 将彩膜基板与阵列基板在真空条件下对盒， 得到液晶显示面板；
e)利用紫外光对液晶显示面板进行辐照， 其中紫外光的波长为 370nm, 紫外光辐照时间为 25min, 紫外光辐照强度为 55mW/cm2;
f)将步骤 e)中得到的液晶显示面板在 120°C加热 2h,得到液晶显示面板 3。 实施例 4
a)将 2.5g粒径在 100-200纳米范围的二氧化硅纳米粒子与 4.5g式 (1)的有 机硅化合物（实施例 4中所用的式 (1)的有机硅化合物参见表 1； 从 ALDRICH 购买获得)溶于 90ml混合溶剂中， 所述混合溶剂由 30ml丙酮、 15ml四氢呋 喃、 30ml水和 15ml的乙醇组成， 将二氧化硅纳米粒子、 有机硅化合物及溶 剂混合后在 75 °C搅拌 35h,反应完成后釆用减压旋转蒸发器将混合溶剂旋干， 得到的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的固体 物质烘干， 得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 其中液晶的 质量分数为 93%, 修饰的二氧化硅纳米粒子的质量分数为 7%;
c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理 8小时； d)分别在彩膜基板和阵列基板上涂覆平面取向层， 利用绒布摩擦取向， 然后将步骤 c)得到的混合物滴加到阵列基板上，将封框胶涂覆到彩膜基板上， 将彩膜基板与阵列基板在真空条件下对盒， 得到液晶显示面板；
e)利用紫外光对液晶显示面板进行辐照， 其中紫外光的波长为 360nm, 紫外光辐照时间为 40min, 紫外光辐照强度为 20mW/cm2;
f)将步骤 e)中得到的液晶显示面板在 90°C加热 3h,得到液晶显示面板 4。 实施例 5
a)将 3g粒径在 100-200纳米范围的二氧化硅纳米粒子与 5g式 (1)的有机 硅化合物（实施例 5中所用的式 (1)的有机硅化合物参见表 1 ; 从 ALDRICH购 买获得)溶于 60ml混合溶剂中， 所述混合溶剂由 20ml丙酮、 10ml四氢呋喃、 20ml水和 10ml的乙醇组成， 将二氧化硅纳米粒子、 有机硅化合物及溶剂混 合后在 65°C搅拌 80h, 反应完成后釆用减压旋转蒸发器将混合溶剂旋干， 得 到的固体物质用乙醇洗涤， 除去未反应的有机硅化合物， 将清洗后的固体物 质烘干， 得到修饰的二氧化硅纳米粒子；
b)将液晶、 修饰的二氧化硅纳米粒子按照一定质量比混合， 其中液晶的 质量分数为 90%, 修饰的二氧化硅纳米粒子的质量分数为 10%;
c)将步骤 b)得到的混合物放置到脱泡器中进行脱泡处理 10小时； d)分别在彩膜基板和阵列基板上涂覆平面取向层， 利用绒布摩擦取向， 然后将步骤 c)得到的混合物滴加到阵列基板上，将封框胶涂覆到彩膜基板上， 将彩膜基板与阵列基板在真空条件下对盒， 得到液晶显示面板；
e)利用紫外光对液晶显示面板进行辐照， 其中紫外光的波长为 380nm, 紫外光辐照时间为 60min, 紫外光辐照强度为 O.lmW/cm2;
f)将步骤 e)中得到的液晶显示面板在 150 °C加热 lh,得到液晶显示面板 5。 实施例 1-5中有机硅化合物的结构式
Figure imgf000014_0001
二、 液晶显示面板的测试
单独将液晶填充到液晶盒中 (参照具体实施例中的步骤 c-f), 得到液晶显 示面板 0 , 分别对液晶显示面板 0与实施例 2中得到的液晶显示面板 2施加 电压， 釆用液晶综合测试仪 (LCT-5016C, 长春联诚仪器有限公司， He-Ne光 源， 波长 632.8nm, 电压 220V)测试其驱动电压 -温度 (V-T)曲线。
表 1中列出了实施例 1-5中用于修饰二氧化硅纳米粒子的有机硅化合物 的结构式。 图 6为未加入本发明修饰后的二氧化硅纳米粒子得到的液晶显示 面板 0 与加入本发明修饰后的二氧化硅纳米粒子得到的液晶显示面板 2 的 V-T曲线测试图， 从图中可以看出， 液晶显示面板中未添加本发明修饰后的 二氧化硅纳米粒子时， 液晶显示面板的最大驱动电压为 9.72 V, 添加修饰后 的二氧化硅纳米粒子后， 液晶显示面板的最大驱动电压降至 8.85V, 由此说 明， 在液晶中添加修饰后的二氧化硅纳米粒子有利于降低液晶显示面板的驱 动电压， 从而起到降低能耗的作用。
综上， 本发明釆用与 ADS模式中向列相液晶分子结构相似的有机硅化 合物修饰二氧化硅纳米粒子， 使修饰后的二氧化硅纳米粒子在液晶中分散均 匀， 且有机硅化合物中含有苯环、 联苯和 /或环己基等刚性基团， 能够有效地 诱导液晶的定向排列， 从而有利于改善 ADS模式液晶显示面板的显示效果， 并且在液晶中添加二氧化硅纳米粒子后有利于降低液晶显示面板的驱动电 压， 从而起到降低能耗的作用。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种纳米粒子， 其特征在于， 所述纳米粒子为利用式 (1)的有机硅化 合物修饰的二氧化硅纳米粒子，
Figure imgf000016_0001
其中， R可以相同或不同地分别为 -H或 -OC2¾; 优选， R为相同的均为 H或 -OC2¾; 更优选， R均为 H;
M 代基中的一种：
Figure imgf000016_0002
2、如权利要求 1所述的纳米粒子， 其中， 所述二氧化硅纳米粒子的粒径 在 lOO nm至 200 nm的范围。
3、 一种诱导多维电场模式液晶排列的方法， 其中， 利用权利要求 1或 2 所述的纳米粒子诱导液晶排列。
4、 如权利要求 3所述的方法， 其中， 所述方法具体包括如下步骤： a)将二氧化硅纳米粒子与式 (1)的有机硅化合物及溶剂混合并搅拌， 反应 完成后， 除去溶剂得到修饰的二氧化硅纳米粒子；
b)将液晶及修饰的二氧化硅纳米粒子混合， 以诱导液晶排列。
5、 如权利要求 4所述的方法， 其中， 所述步骤 a)中将二氧化硅纳米粒 子与式 (1)的有机硅化合物及溶剂混合后， 在 60_80°C搅拌 24_100h。
6、 如权利要求 4所述的方法， 其中， 所述步骤 b)的混合物中， 液晶的 质量分数为 90-99%, 修饰的二氧化硅纳米粒子的质量分数为 1-10%。
7、 如权利要求 4-6中任一项所述的方法， 其中， 所述溶剂为丙酮、 四氢 呋喃、 乙醇和水的混合溶剂， 优选丙酮、 四氢呋喃、 水和乙醇的体积比为 2: 1 : 2: 1。
8、 一种液晶显示面板， 其中， 所述液晶显示面板利用权利要求 1 或 2 所述的纳米粒子诱导液晶排列。
9、一种液晶显示装置， 其中， 所述装置包括如权利要求 8所述的液晶显 示面板。
10、 如权利要求 1或 2所述纳米粒子在液晶显示面板、 特别是诱导液晶 排列例如诱导多维电场模式液晶排列中的用途。
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