WO2017020412A1 - 一种适用于psva型液晶显示面板的配向方法 - Google Patents

一种适用于psva型液晶显示面板的配向方法 Download PDF

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WO2017020412A1
WO2017020412A1 PCT/CN2015/090554 CN2015090554W WO2017020412A1 WO 2017020412 A1 WO2017020412 A1 WO 2017020412A1 CN 2015090554 W CN2015090554 W CN 2015090554W WO 2017020412 A1 WO2017020412 A1 WO 2017020412A1
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liquid crystal
display panel
crystal display
semi
transmissive mask
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French (fr)
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陈兴武
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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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    • 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
    • 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
    • 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
    • G02F1/133703—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by introducing organic surfactant additives into the liquid crystal material
    • 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
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • 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
    • G02F1/133715—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films by first depositing a monomer
    • 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
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13775—Polymer-stabilized liquid crystal layers

Definitions

  • the present invention relates to the field of display technology, and in particular to an alignment method suitable for a PSVA type liquid crystal display panel.
  • VA Vertical Alignment
  • the earliest method was to make bumps on the substrate to cause liquid crystal molecules to produce a certain pretilt angle near the bumps, thereby guiding the liquid crystal molecules to tilt in a predetermined direction.
  • the second method is to etch a trench on the indium tin oxide (ITO) electrode layer of the upper and lower substrates to make a certain inclination angle of the electric field lines, thereby controlling the tilting direction of the liquid crystal molecules.
  • ITO indium tin oxide
  • PVA Patterned Vertical Alignment
  • the third method is to etch a slit on the ITO electrode layer on the side of the array substrate, and the ITO electrode layer on the side of the color filter substrate is a flat electrode, and a reactive monomer (RM) is added to the liquid crystal.
  • a voltage is applied, polymerization is performed by ultraviolet light irradiation, and a granular protrusion is formed on the surface of the substrate to guide the liquid crystal molecules to tilt in a certain direction to achieve an alignment effect.
  • This technique is called Polymer Stabilized Vertical Alignment (PSVA).
  • the PSVA type liquid crystal display has the advantages of high contrast, ultra-low dark state effect and the like.
  • the gamma curve will deviate, that is, the color shift will occur, which will affect the viewing effect.
  • the engineers divide the sub-pixels into the main area and the slave area through circuit design.
  • the deviation of the gamma curve generated by the sub-pixels of the main region and the sub-region at a large viewing angle is reduced, thereby reducing the bias of the large-view character.
  • changing the circuit design increases the number of gate lines, data lines, and thin film transistors, resulting in a reduction in aperture ratio and increased drive difficulty.
  • An object of the present invention is to provide an alignment method suitable for a PSVA type liquid crystal display panel, which can solve the existing method
  • the PSVA type liquid crystal display panel has a technical problem of a small aperture ratio.
  • the present invention provides an alignment method suitable for a PSVA type liquid crystal display panel, wherein a liquid crystal layer doped with a photopolymerizable monomer is filled between two substrates of the liquid crystal display panel, and the method includes:
  • the semi-transmissive mask comprising a plurality of regions, the light transmittance of each region being unequal;
  • the liquid crystal display panel is subjected to illumination treatment by using the semi-transmissive mask, and the photopolymerizable monomer is polymerized on the surface of the two substrates to form a granular polymer, so that liquid crystals corresponding to different regions are formed.
  • the tilt angle of the molecules is different;
  • the application of the alternating voltage is stopped, and the liquid crystal display panel is further subjected to illumination treatment using the semi-transmissive mask until the photopolymerization monomer is polymerized.
  • the state in which the alternating voltage is applied is maintained, and the duration of the light treatment of the liquid crystal display panel by using the semi-transmissive mask is 0 to 200 seconds.
  • the application of the alternating voltage is stopped, and the duration of the light treatment of the liquid crystal display panel by using the semi-transmissive mask is continued for 1 to 2 hours.
  • the liquid crystal molecules in the liquid crystal display panel are negative liquid crystal molecules.
  • liquid crystal molecules are inclined at an angle of 85° to 90°.
  • the illumination wavelength is from 313 nanometers to 365 nanometers.
  • the photopolymerizable monomer has a reaction temperature of 30 to 60 degrees Celsius.
  • the semi-transmissive mask comprises a first region and a second region having different light transmittances.
  • the upper substrate of the liquid crystal display panel is provided with a flat common electrode
  • the lower substrate is provided with a pixel electrode having a fishbone pattern.
  • the light used for the illumination treatment is ultraviolet light.
  • the present invention brings about the following beneficial effects:
  • the embodiment of the present invention provides an alignment method suitable for a PSVA type liquid crystal display panel, wherein a liquid crystal layer doped with a photopolymerizable monomer is filled between two substrates of the liquid crystal display panel.
  • an alternating voltage is applied to the liquid crystal display panel
  • the liquid crystal display panel is subjected to illumination treatment by using a semi-transparent mask having a plurality of regions having different light transmittances, so that the photopolymerizable monomer is polymerized on the surface of the two substrates to form particles.
  • the polymer has different tilt angles of liquid crystal molecules corresponding to different regions.
  • the light treatment is continued until the photopolymerization monomer is polymerized.
  • the PSVA type liquid crystal display panel obtained by the alignment method has a plurality of alignment regions, and the pretilt angles of the liquid crystal molecules in each alignment region are different, and the PSVA type liquid crystal display can be improved without separately providing structures such as gate lines, data lines, and thin film transistors.
  • the color shift phenomenon of the panel while ensuring the PSVA type liquid crystal display panel High aperture ratio.
  • FIG. 1 is a schematic flow chart of an alignment method applied to a PSVA type liquid crystal display panel according to an embodiment of the present invention
  • FIG. 2 to FIG. 5 are schematic diagrams showing the alignment process of a liquid crystal display panel according to an embodiment of the present invention.
  • the present invention provides an alignment method suitable for a PSVA type liquid crystal display panel.
  • the liquid crystal display panel includes an upper substrate 11 and a lower substrate 12 disposed in parallel with the upper substrate 11, and a liquid crystal layer is filled between the two substrates.
  • a liquid crystal material in which the photopolymerizable monomer 4 is mixed is used, and the photopolymerizable monomer 4 can be used to orient the liquid crystal molecules 3 in a specified direction to form a specified alignment region.
  • the particulate polymer 5 formed by polymerization of the photopolymerizable monomer 4 in the alignment region can restrict the alignment of the liquid crystal molecules 3 to complete the alignment of the PSVA type liquid crystal display panel.
  • the alignment method applicable to the PSVA type liquid crystal display panel includes:
  • Step S101 Acquiring a semi-transparent mask, the semi-transmissive mask comprises a plurality of regions, and the transmittances of the regions are not equal.
  • the semi-transmissive mask includes a plurality of regions having different light transmittances, each region corresponding to a different portion of a sub-pixel in the liquid crystal display panel.
  • each sub-pixel has a main area and a sub-area.
  • the semi-transparent mask obtained includes a first area 61 corresponding to the main area, and a corresponding sub-area.
  • the second area 62 The embodiment of the present invention is specifically described by taking a sub-pixel having a main area and a sub-area as an example.
  • the main area occupies 40% of the light transmissive area of the sub-pixel, and the sub-area occupies 60% of the light transmissive area of the sub-pixel. It is obvious that the percentages of the main area and the slave area can be set according to actual conditions, which is not limited by the embodiment of the present invention.
  • Step S102 applying an alternating voltage to the liquid crystal display panel to make liquid crystal molecules and photopolymerizable monomers in the liquid crystal layer Tilt in a certain direction.
  • the upper substrate 11 of the PSVA type liquid crystal display panel is provided with a flat common electrode 21, and the lower substrate 12 is provided with a pixel electrode 22 having a fishbone pattern. Since the liquid crystal molecules 3 in the liquid crystal display panel in the embodiment of the present invention are negative-direction liquid crystal molecules, the photopolymerizable monomer 4 and the liquid crystal molecules 3 located between the upper substrate 11 and the lower substrate 12 are both when no electric field is applied. Arranged perpendicular to the upper substrate 11 and the lower substrate 12.
  • the liquid crystal molecules 3 and the photopolymerizable monomer 4 are tilted by the electric field between the upper substrate 11 and the lower substrate 12, and are again oriented in accordance with the direction of the electric field, and The original vertical alignment has a smaller angle of inclination.
  • the liquid crystal molecules 3 when the liquid crystal molecules 3 are energized, they tend to be aligned perpendicular to the direction of the electric field. Therefore, as shown in FIG. 3, the oblique directions of the liquid crystal molecules 3 are inconsistent by the influence of the direction of the electric field.
  • Step S103 maintaining a state in which an alternating voltage is applied, and performing illumination treatment on the liquid crystal display panel by using a semi-transparent mask, and photopolymerizing monomers are polymerized on the surface of the two substrates to form a granular polymer, so that liquid crystal molecules corresponding to the respective regions are formed.
  • the angle of inclination is different.
  • the photopolymerizable monomer 4 has photopolymerization properties, and thus the photopolymerizable monomer 4 is polymerized and cured upon being irradiated with light of sufficient energy.
  • ultraviolet light having a wavelength of 313 nm to 365 nm is used for illumination treatment, and the reaction temperature of the photopolymerizable monomer 4 is controlled at 30 to 60 degrees Celsius to ensure a good photopolymerization effect.
  • the state in which the alternating voltage is applied is maintained, and the duration of the light treatment of the liquid crystal display panel by the semi-transmissive mask is 0 to 200 seconds, which is to use the particulate polymer 5 produced by polymerization of the photopolymerizable monomer 4,
  • the liquid crystal molecules 3 are fixed at a certain inclination angle.
  • the semi-transmissive mask includes the first region 61 and the second region 62 having different light transmittances
  • the ultraviolet light is formed by the semi-transparent mask.
  • the photopolymerizable monomer 4 polymerized and cured at different energies has a different molecular structure, and thus two alignment regions are defined in the sub-pixel.
  • the tilt angles of the liquid crystal molecules 3 in the respective alignment regions are different.
  • the liquid crystal molecules 3 located in the two alignment regions exhibit different, specific pretilt angles, which are not perpendicular to the upper substrate 11 and the lower substrate 12.
  • Step S104 stopping the application of the alternating voltage, and continuing to irradiate the liquid crystal display panel with the semi-transparent mask until the photopolymerization monomer is polymerized.
  • the illumination processing time should be shortened as much as possible to improve the production efficiency of the liquid crystal display panel.
  • too fast polymerization can result in incomplete polymerization, while the remaining unpolymerized monomers can produce undesirable image sticking.
  • the application of the alternating voltage is stopped, and the duration of the illumination treatment of the liquid crystal display panel by using the semi-transparent mask is continued for 1 to 2 hours to ensure that the photopolymerizable monomer 4 can be polymerized, as shown in FIG.
  • the threshold voltages at which the liquid crystal molecules 3 of different pretilt angles are driven are different. Therefore, when a single sub-pixel is displayed, different alignment regions in the sub-pixels can exhibit different display brightness. As such, the formation of a plurality of alignment regions in the sub-pixels helps to improve the color shift phenomenon of a large viewing angle (greater than or equal to 60 degrees). Moreover, compared with the technique known to improve the color shift phenomenon, a plurality of alignment regions are formed by light treatment, and the number of gate lines, data lines, and thin film transistors is not required to be increased, and the liquid crystal display panel can have a high display aperture ratio and sub-pixels. There is no need to match complex driving methods.
  • the sub-pixels form the first alignment region D1 and the second alignment region D2, respectively corresponding to the main region of the sub-pixel and From the region, the liquid crystal molecules 3 exhibit different pretilt angles in the first alignment region D1 and the second alignment region D2. Since the pretilt angles of the liquid crystal molecules 3 of the first alignment region D1 and the second alignment region D2 are different, even if the same voltage is applied to the entire sub-pixel, the final angle of the liquid crystal molecules 3 of the first alignment region D1 and the second alignment region D2 is also Different, so the liquid crystal display panel can exhibit good display quality.
  • the present invention does not limit the angle of pretilt angle exhibited by the liquid crystal molecules 3 in the first alignment region D1 and the second alignment region D2, wherein the liquid crystal molecules 3 are different in the first alignment region D1 and the second alignment region D2.
  • the pretilt angle is in accordance with the spirit of the present invention.
  • an embodiment of the present invention provides an alignment method suitable for a PSVA type liquid crystal display panel.
  • a liquid crystal layer doped with a photopolymerizable monomer 4 is filled between two substrates of the liquid crystal display panel.
  • the liquid crystal display panel is subjected to illumination treatment by using a semi-transparent mask having a plurality of regions having different light transmittances, so that the photopolymerizable monomer 4 is polymerized on the surfaces of the two substrates to form a photopolymerizable monomer.
  • the tilt angles of the liquid crystal molecules 3 corresponding to different regions are different.
  • the PSVA type liquid crystal display panel obtained by the alignment method has a plurality of alignment regions, and the pretilt angles of the liquid crystal molecules 3 in each alignment region are different, and the PSVA type liquid crystal can be improved without separately providing structures such as gate lines, data lines, and thin film transistors.
  • the color shift phenomenon of the display panel ensures the high aperture ratio of the PSVA type liquid crystal display panel.

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  • Nonlinear Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mathematical Physics (AREA)
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Abstract

提供了一种适用于PSVA型液晶显示面板的配向方法，可解决现有的PSVA型液晶显示面板的开口率小的技术问题。液晶显示面板的两块基板（11，12）之间填充有掺杂光致聚合单体（4）的液晶层，适用于PSVA型液晶显示面板的配向方法包括：获取半透掩膜版，半透掩膜版包括多个区域（61，62），各区域的透光率不相等（S101）；对液晶显示面板施加交流电压，使液晶层中的液晶分子（3）和光致聚合单体（4）沿着一定的方向倾斜（S102）；维持施加交流电压的状态，利用半透掩膜版对液晶显示面板进行光照处理，光致聚合单体（4）在两块基板（11，12）表面发生聚合，形成颗粒状聚合物（5），使得不同区域对应的液晶分子（3）的倾斜角度不同（S103）；停止施加交流电压，继续利用半透掩膜版对液晶显示面板进行光照处理，直至光致聚合单体（4）聚合完毕（S104）。

Description

一种适用于PSVA型液晶显示面板的配向方法
本申请要求享有2015年07月31日提交的名称为“一种适用于PSVA型液晶显示面板的配向方法”的中国专利申请CN 201510460229.8的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，具体地说，涉及一种适用于PSVA型液晶显示面板的配向方法。
背景技术
垂直配向(Vertical Alignment，简称VA)型液晶显示器的实现方法有多种。最早的方法是在基板上制作出凸起，使液晶分子在凸起附近产生一定的预倾角，从而引导液晶分子朝预定的方向倾倒。第二种是在上下基板的氧化铟锡(Indium Tin Oxide，简称ITO)电极层刻蚀出沟槽，使电场线产生的一定的倾斜角度，从而控制液晶分子的倾倒方向。这一技术称为垂直取向构型(Patterned Vertical Alignment，简称PVA)。
第三种是在阵列基板侧的ITO电极层刻蚀出缝隙，而彩膜基板侧的ITO电极层为平板电极，同时在液晶中添加可聚合单体(Reactive monomer，简称RM)。施加电压的同时利用紫外光照射聚合，在基板表面形成颗粒状凸起，引导液晶分子朝某个方向倾倒，达到配向的效果。这一技术称为聚合物稳定垂直对齐型(Polymer Stabilized Vertical Alignment，简称PSVA)。
PSVA型液晶显示器具有高对比度、超低暗态效果等优点。但PSVA型液晶显示器在大视角下，伽马曲线会发生偏离，即产生色偏，影响观看效果。为了降低大视角色偏，拓宽视角，工程人员通过电路设计，将亚像素分为主区域和从区域。分为主区域和从区域的亚像素在大视角时产生的伽马曲线的偏离减小，从而降低大视角色偏。但是，更改电路设计会增加栅线、数据线及薄膜晶体管的数量，导致开口率减小，增加驱动难度。
发明内容
本发明的目的在于提供一种适用于PSVA型液晶显示面板的配向方法，可解决现有 的PSVA型液晶显示面板的开口率小的技术问题。
本发明提供了一种适用于PSVA型液晶显示面板的配向方法，所述液晶显示面板的两块基板之间填充有掺杂光致聚合单体的液晶层，该方法包括：
获取半透掩膜版，所述半透掩膜版包括多个区域，各区域的透光率不相等；
对所述液晶显示面板施加交流电压，使液晶层中的液晶分子和光致聚合单体沿着一定的方向倾斜；
维持施加交流电压的状态，利用所述半透掩膜版对所述液晶显示面板进行光照处理，光致聚合单体在两块基板表面发生聚合，形成颗粒状聚合物，使得不同区域对应的液晶分子的倾斜角度不同；
停止施加交流电压，继续利用所述半透掩膜版对所述液晶显示面板进行光照处理，直至光致聚合单体聚合完毕。
可选的，维持施加交流电压的状态，利用所述半透掩膜版对所述液晶显示面板进行光照处理的时长为0至200秒。
可选的，停止施加交流电压，继续利用所述半透掩膜版对所述液晶显示面板进行光照处理的时长为1至2小时。
可选的，所述液晶显示面板中的液晶分子为负向液晶分子。
可选的，液晶分子的倾斜角度为85°至90°。
可选的，光照波长为313纳米至365纳米。
可选的，光致聚合单体的反应温度为30至60摄氏度。
可选的，所述半透掩膜版包括透光率不同的第一区域和第二区域。
可选的，所述液晶显示面板的上基板设置有平板状的公共电极，下基板设置有呈鱼骨图案的像素电极。
可选的，进行光照处理所用的光线为紫外光。
本发明带来了以下有益效果：本发明实施例提供了一种适用于PSVA型液晶显示面板的配向方法，液晶显示面板的两块基板之间填充有掺杂光致聚合单体的液晶层。对液晶显示面板施加交流电压时，利用具有透光率不同的多个区域的半透掩膜版，对液晶显示面板进行光照处理，使得光致聚合单体在两块基板表面发生聚合，形成颗粒状聚合物，不同区域对应的液晶分子的倾斜角度不同。并且，在停止施加交流电压后，继续进行光照处理，直至光致聚合单体聚合完毕。通过该配向方法获得的PSVA型液晶显示面板具有多个配向区，每个配向区的液晶分子的预倾角不同，无需另外设置栅线、数据线、薄膜晶体管等结构，即可改善PSVA型液晶显示面板的色偏现象，同时保证PSVA型液晶显示面板的 高开口率。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是本发明实施例提供的适用于PSVA型液晶显示面板的配向方法的流程示意图；
图2至图5是本发明实施例提供的液晶显示面板的配向过程的示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
本发明提供了一种适用于PSVA型液晶显示面板的配向方法。液晶显示面板包括上基板11以及与上基板11平行配置的下基板12，两块基板之间填充有液晶层。形成该液晶层时，使用混入了光致聚合单体4的液晶材料，光致聚合单体4可用来使液晶分子3按照指定方向取向，形成指定的配向区。配向区中的由光致聚合单体4聚合形成的颗粒状聚合物5可对液晶分子3进行取向限制，完成对PSVA型液晶显示面板的配向。
具体的，如图1所示，该适用于PSVA型液晶显示面板的配向方法包括：
步骤S101、获取半透掩膜版，半透掩膜版包括多个区域，各区域的透光率不相等。
该半透掩膜版包括透光率各不相同的多个区域，各区域对应液晶显示面板中的亚像素的不同部分。例如，对于实现大视角的液晶显示面板而言，各亚像素具有主区域和从区域，针对这样的亚像素，获取到的半透掩膜版包括对应主区域的第一区域61、对应从区域的第二区域62。本发明实施例以形成具有主区域和从区域的亚像素为例进行具体说明。
在本发明实施例中，主区域占亚像素的透光区域的40％，而从区域占亚像素的透光区域的60％。显然，主区域和从区域的百分比可根据实际情况设定，本发明实施例对此不进行限定。
步骤S102、对液晶显示面板施加交流电压，使液晶层中的液晶分子和光致聚合单体 沿着一定的方向倾斜。
如图2所示，该PSVA型的液晶显示面板的上基板11设置有平板状的公共电极21，下基板12设置有呈鱼骨图案的像素电极22。由于本发明实施例中的液晶显示面板中的液晶分子3为负向液晶分子，在未施加电场时，位于上基板11和下基板12之间的光致聚合单体4和液晶分子3都是垂直于上基板11和下基板12排列的。
在上基板11以及下基板12之间施加交流电压之后，液晶分子3和光致聚合单体4因受到上基板11和下基板12之间的电场作用而倾倒，都重新按照电场方向取向，并与原先的垂直排列情况相比有一个小的倾斜角度。具体的，液晶分子3加电时倾向垂直于电场的方向排列。因此，如图3所示，受到电场方向的影响，液晶分子3的倾斜方向不一致。
步骤S103、维持施加交流电压的状态，利用半透掩膜版对液晶显示面板进行光照处理，光致聚合单体在两块基板表面发生聚合，形成颗粒状聚合物，使得各区域对应的液晶分子的倾斜角度不同。
光致聚合单体4具有光聚合的性质，因此光致聚合单体4一但受到足够能量的光线照射后，会产生聚合作用并固化。本发明实施例中，选用波长为313纳米至365纳米的紫外光进行光照处理，光致聚合单体4的反应温度控制在30至60摄氏度，以保证有良好的光聚合效果。
其中，维持施加交流电压的状态，利用半透掩膜版对液晶显示面板进行光照处理的时长为0至200秒，这是为了利用光致聚合单体4聚合产生的颗粒状聚合物5，将液晶分子3固定在一定的倾斜角度。
如图4所示，由于半透掩膜版包括透光率不同的第一区域61和第二区域62，利用该半透掩膜版进行光照处理时，紫外光通过半透掩膜版形成两个光照能量不同的区域。在不同能量下聚合固化的光致聚合单体4具有不同的分子结构，因此在亚像素中定义出两个配向区。各配向区的液晶分子3的倾斜角度不同。并且，上基板11和下基板12上施加的交流电压被移除之后，位于两个配向区的液晶分子3会呈现不同的、特定的预倾角，不垂直于上基板11和下基板12。
步骤S104、停止施加交流电压，继续利用半透掩膜版对液晶显示面板进行光照处理，直至光致聚合单体聚合完毕。
在生产工艺中，光照处理时间应该被尽可能缩短，以提高液晶显示面板的生产效率。然而，过快的聚合会导致聚合不完全，而剩余的未聚合单体会产生不期望看到的图像残留。其中，停止施加交流电压，继续利用半透掩膜版对液晶显示面板进行光照处理的时长为1至2小时，以保证光致聚合单体4可以聚合完毕，如图5所示。
由于，亚像素进行画面显示时，不同预倾角的液晶分子3被驱动的临限电压不同。所以，单一亚像素进行显示时，亚像素中的不同配向区可以呈现不同的显示亮度。如此一来，亚像素中的多个配向区的形成有助于改善大视角(大于或等于60度)的色偏现象。且与已知改善色偏现象的技术相比，通过光照处理形成多个配向区，无需增多栅线、数据线和薄膜晶体管的数量，液晶显示面板可以具有较高的显示开口率，且亚像素也不需搭配复杂的驱动方式。
特别是半透掩膜版设置有透光率不同的第一区域61和第二区域62的情况下，亚像素形成第一配向区D1和第二配向区D2，分别对应亚像素的主区域和从区域，液晶分子3在第一配向区D1与第二配向区D2呈现相异的预倾角。由于第一配向区D1和第二配向区D2的液晶分子3的预倾角不同，即使整个亚像素施加上相同的电压，第一配向区D1和第二配向区D2的液晶分子3最终的角度也不同，因此液晶显示面板可以呈现良好的显示品质。
当然，本发明并不限定液晶分子3在第一配向区D1与第二配向区D2中所呈现预倾角角度为何，其中液晶分子3在第一配向区D1与在第二配向区D2呈现不同的预倾角就可符合本发明的精神。
综上，本发明实施例提供了一种适用于PSVA型液晶显示面板的配向方法，液晶显示面板的两块基板之间填充有掺杂光致聚合单体4的液晶层。对液晶显示面板施加交流电压时，利用具有透光率不同的多个区域的半透掩膜版，对液晶显示面板进行光照处理，使得光致聚合单体4在两块基板表面发生聚合，形成颗粒状聚合物5，不同区域对应的液晶分子3的倾斜角度不同。并且，在停止施加交流电压后，继续进行光照处理，直至光致聚合单体4聚合完毕。通过该配向方法获得的PSVA型液晶显示面板具有多个配向区，每个配向区的液晶分子3的预倾角不同，无需另外设置栅线、数据线、薄膜晶体管等结构，即可改善PSVA型液晶显示面板的色偏现象，同时保证PSVA型液晶显示面板的高开口率。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (10)

  1. 一种适用于PSVA型液晶显示面板的配向方法，所述液晶显示面板的两块基板之间填充有掺杂光致聚合单体的液晶层，所述方法包括：
    获取半透掩膜版，所述半透掩膜版包括多个区域，各区域的透光率不相等；
    对所述液晶显示面板施加交流电压，使液晶层中的液晶分子和光致聚合单体沿着一定的方向倾斜；
    维持施加交流电压的状态，利用所述半透掩膜版对所述液晶显示面板进行光照处理，光致聚合单体在两块基板表面发生聚合，形成颗粒状聚合物，使得不同区域对应的液晶分子的倾斜角度不同；
    停止施加交流电压，继续利用所述半透掩膜版对所述液晶显示面板进行光照处理，直至光致聚合单体聚合完毕。
  2. 根据权利要求1所述的方法，其中，维持施加交流电压的状态，利用所述半透掩膜版对所述液晶显示面板进行光照处理的时长为0至200秒。
  3. 根据权利要求1所述的方法，其中，停止施加交流电压，继续利用所述半透掩膜版对所述液晶显示面板进行光照处理的时长为1至2小时。
  4. 根据权利要求1所述的方法，其中，所述液晶显示面板中的液晶分子为负向液晶分子。
  5. 根据权利要求1所述的方法，其中，液晶分子的倾斜角度为85°至90°。
  6. 根据权利要求1所述的方法，其中，光照波长为313纳米至365纳米。
  7. 根据权利要求1所述的方法，其中，光致聚合单体的反应温度为30至60摄氏度。
  8. 根据权利要求1所述的方法，其中，所述半透掩膜版包括透光率不同的第一区域和第二区域。
  9. 根据权利要求1所述的方法，其中，所述液晶显示面板的上基板设置有平板状的公共电极，下基板设置有呈鱼骨图案的像素电极。
  10. 根据权利要求1所述的方法，其中，进行光照处理所用的光线为紫外光。
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