WO2018214207A1 - Ffs型液晶显示面板的配向方法 - Google Patents

Ffs型液晶显示面板的配向方法 Download PDF

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Publication number
WO2018214207A1
WO2018214207A1 PCT/CN2017/089267 CN2017089267W WO2018214207A1 WO 2018214207 A1 WO2018214207 A1 WO 2018214207A1 CN 2017089267 W CN2017089267 W CN 2017089267W WO 2018214207 A1 WO2018214207 A1 WO 2018214207A1
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Prior art keywords
liquid crystal
alignment
display panel
crystal display
type liquid
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English (en)
French (fr)
Inventor
侯俊
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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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Priority to US15/551,291 priority Critical patent/US10429695B2/en
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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
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
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    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • 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
    • C09K2323/027—Polyimide
    • 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
    • G02F1/133784—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 rubbing
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
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    • G02—OPTICS
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    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel
    • G—PHYSICS
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    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0444—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an alignment method of an FFS type liquid crystal display panel.
  • 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 panels on the mainstream market can be classified into the following types: Vertical Alignment (VA) type, Twisted Nematic (TN) or Super Twisted (Super Twisted). Nematic, STN) type, In-Plane Switching (IPS) type, and Fringe Field Switching (FFS) type.
  • VA Vertical Alignment
  • TN Twisted Nematic
  • IPS In-Plane Switching
  • FFS Fringe Field Switching
  • the FFS liquid crystal display panel has the advantages of high penetration, wide viewing angle, etc., and has been widely used in small and medium size displays, especially mobile phone panels.
  • liquid crystal (LC) molecules in a liquid crystal cell (Cell) are rotated in a plane parallel to the substrate by a boundary electric field to generate an optical path difference, and the display effect is achieved by the action of the upper and lower polarizers. Therefore, the liquid crystal molecules in the FFS liquid crystal display panel should be horizontally aligned.
  • the existing alignment technologies mainly include: rubbing alignment and light alignment. The specific method of the rubbing alignment is: passing a cloth roller on the alignment film.
  • the grooves arranged in a certain direction are brushed so that the liquid crystal molecules are aligned along the groove direction on the alignment film.
  • the method is simple in process, and exhibits good photoelectric effect and thermal stability after alignment, but the aligned liquid crystal molecules
  • the pretilt angle is large, and there is a certain degree of light leakage, which affects the contrast.
  • the photo-alignment method is: adding a reactive small molecule (RM) to the liquid crystal material, and after the panel is composed, an electric field is applied to the panel to rotate the liquid crystal at a certain angle with the electric field driving direction, and then ultraviolet (UV) is used.
  • RM reactive small molecule
  • the light causes the polymerization reaction of RM on the surface of the alignment film in the liquid crystal material to generate a polymer bump to achieve the alignment effect, and the photoalignment process can effectively reduce the pretilt angle of the liquid crystal molecules and improve the contrast, but the energy consumption is high and It is easy to produce defects such as afterimages due to poor anchoring force on the surface of the alignment film, and its application is also greatly limited.
  • An object of the present invention is to provide an alignment method of an FFS liquid crystal display panel, which can reduce the pretilt angle of liquid crystal molecules while maintaining the strong anchoring force of the alignment film, and improve the display quality of the FFS liquid crystal display panel.
  • the present invention provides an alignment method of an FFS type liquid crystal display panel, comprising the following steps:
  • Step S1 providing a friction alignment material, a photoinitiator, and a photosensitive small molecule compound, mixing the friction alignment material, the photoinitiator, and the photosensitive small molecule compound to obtain an alignment film material;
  • Step S2 providing an array substrate and a color filter substrate, respectively coating and curing the alignment film material on the color film substrate and the array substrate to form two alignment films;
  • the array substrate includes: a base substrate, a common electrode disposed on the base substrate, an insulating layer disposed on the common electrode, and a pixel electrode disposed on the insulating layer;
  • the common electrode is a continuous cover substrate a planar electrode, the pixel electrode being a patterned electrode having a slit;
  • Step S3 performing frictional alignment treatment on the alignment film
  • Step S4 aligning the array substrate and the color filter substrate into a box, filling a liquid crystal between the array substrate and the color filter substrate, and forming a touch electrode on a side of the color filter substrate away from the array substrate,
  • the touch electrode is a planar electrode continuously covering the color filter substrate;
  • Step S5 applying a voltage between the touch electrode and the common electrode, so that the liquid crystal between the array substrate and the color filter substrate is rotated to a position parallel to the array substrate, and the alignment film is subjected to UV illumination, so that the alignment is performed.
  • Step S6 after the polymerization of the photosensitive small molecule compound is completed, the voltage between the touch electrode and the common electrode is removed, and UV illumination is stopped on the alignment film, and a plurality of polymer protrusions are formed on the surface of the alignment film.
  • the plurality of polymer bumps are such that the liquid crystal remains parallel to the array substrate.
  • the weight percentage of the photoinitiator in the alignment film material is from 0.1% by weight to 1% by weight.
  • the weight percentage of the photosensitive small molecule compound in the alignment film material is from 0.1% by weight to 2% by weight.
  • the photosensitive small molecule compound is a polyarylate small molecule.
  • the chemical formula of the photosensitive small molecule compound is:
  • the friction alignment material is polyimide.
  • the alignment film material is cured by a baking process, and the baking process has a temperature of 120 ° C to 200 ° C and a time of 15 to 60 minutes.
  • the voltage applied between the touch electrode and the common electrode in the step S5 is 5V to 15V.
  • the UV light that irradiates the alignment film in the step S5 has a wavelength of 365 nm and an energy of 30 mj to 100 mj.
  • the material of the touch electrode is ITO.
  • the invention also provides an alignment method of an FFS type liquid crystal display panel, comprising the following steps:
  • Step S1 providing a friction alignment material, a photoinitiator, and a photosensitive small molecule compound, mixing the friction alignment material, the photoinitiator, and the photosensitive small molecule compound to obtain an alignment film material;
  • Step S2 providing an array substrate and a color filter substrate, respectively coating and curing the alignment film material on the color film substrate and the array substrate to form two alignment films;
  • the array substrate includes: a base substrate, a common electrode disposed on the base substrate, an insulating layer disposed on the common electrode, and a pixel electrode disposed on the insulating layer;
  • the common electrode is a continuous cover substrate a planar electrode, the pixel electrode being a patterned electrode having a slit;
  • Step S3 performing frictional alignment treatment on the alignment film
  • Step S4 aligning the array substrate and the color filter substrate into a box, filling liquid crystal molecules between the array substrate and the color filter substrate, and forming a touch electrode on a side of the color filter substrate away from the array substrate
  • the touch electrode is a planar electrode continuously covering the color filter substrate
  • Step S5 applying a voltage between the touch electrode and the common electrode, so that the liquid crystal molecules between the array substrate and the color filter substrate are rotated to a position parallel to the array substrate, and the alignment film is subjected to UV illumination to make alignment Polymerization of a photosensitive small molecule compound in the film;
  • Step S6 after the polymerization of the photosensitive small molecule compound is completed, the voltage between the touch electrode and the common electrode is removed, and UV illumination is stopped on the alignment film, and a plurality of polymer protrusions are formed on the surface of the alignment film. Said plurality of polymer protrusions such that said liquid crystal molecules remain parallel to the array substrate;
  • the weight percentage of the photoinitiator in the alignment film material is from 0.1% by weight to 1% by weight;
  • the weight percentage of the photosensitive small molecule compound in the alignment film material is 0.1% by weight to 2% by weight.
  • an alignment method of an FFS type liquid crystal display panel which comprises adding a photosensitive small molecule compound to a friction alignment material, and performing frictional alignment after formation of the alignment film, and then making an FFS type liquid crystal display panel Forming a box, then applying a voltage to rotate the liquid crystal molecules to a position parallel to the substrate, and concentrating the photosensitive small molecule compound by UV illumination
  • the polymer protrusion is formed so that the liquid crystal molecules remain parallel to the substrate, and the pre-tilt angle of the aligned liquid crystal molecules is zero, and the pretilt angle of the liquid crystal molecules can be lowered while maintaining the strong anchoring force of the alignment film, and the FFS type is improved.
  • the display quality of the LCD panel which comprises adding a photosensitive small molecule compound to a friction alignment material, and performing frictional alignment after formation of the alignment film, and then making an FFS type liquid crystal display panel Forming a box, then applying a voltage to rotate the liquid crystal molecules to a position parallel to the substrate, and concentrating the photosensitive small molecule compound
  • FIGS. 1 and 2 are schematic diagrams showing steps S2 and S3 of the alignment method of the FFS type liquid crystal display panel of the present invention
  • FIG. 3 and FIG. 4 are schematic diagrams showing a step S4 of the alignment method of the FFS type liquid crystal display panel of the present invention.
  • step S5 is a schematic diagram of step S5 of the alignment method of the FFS type liquid crystal display panel of the present invention.
  • step S6 is a schematic diagram of step S6 of the alignment method of the FFS type liquid crystal display panel of the present invention.
  • Fig. 7 is a flow chart showing the alignment method of the FFS type liquid crystal display panel of the present invention.
  • the present invention provides a method for aligning an FFS liquid crystal display panel, comprising the following steps:
  • Step S1 providing a friction alignment material, a photoinitiator, and a photosensitive small molecule compound, and mixing the friction alignment material, the photoinitiator, and the photosensitive small molecule compound to obtain an alignment film material.
  • the weight percentage of the photoinitiator in the alignment film material is 0.1% by weight to 1% by weight, and the weight percentage of the photosensitive small molecule compound in the alignment film material is 0.1% by weight to 2% by weight.
  • the friction-aligning material is a material of an alignment film used in a common frictional alignment.
  • the friction-aligning material is polyimide (PI)
  • the photosensitive small molecule compound is a polyarylate.
  • a small molecule, preferably, the chemical formula of the photosensitive small molecule compound is as follows:
  • Step S2 as shown in FIG. 1 and FIG. 2, an array substrate 1 and a color filter substrate 2 are provided, and an alignment film material is applied and cured on the color filter substrate 2 and the array substrate 1, respectively, to form two alignment films 3.
  • the array substrate 1 includes a base substrate 11 , a common electrode 12 disposed on the base substrate 11 , an insulating layer 13 disposed on the common electrode 12 , and a pixel electrode 14 disposed on the insulating layer 13 .
  • the structure of the color filter substrate 3 is not limited, and any color filter substrate suitable for the FFS type liquid crystal display panel can be used, and will not be described in detail herein.
  • the common electrode 12 is a planar electrode that continuously covers the base substrate 11, and the pixel electrode 14 is a patterned electrode having a slit, thereby generating a fringe field electric field through the common electrode 12 and the pixel electrode 14 to drive
  • the liquid crystal molecules rotate in a plane parallel to the substrate.
  • the alignment film material is cured by a baking process, and the baking process has a temperature of 120 ° C to 200 ° C and a time of 15 to 60 minutes.
  • a plurality of photosensitive small molecule compounds 31 are distributed in the alignment film 3.
  • Step S3 as shown in FIGS. 1 and 2, the alignment film 3 is subjected to rubbing alignment treatment.
  • the step S3 specifically grinds the grooves arranged in a certain direction on the alignment film 3 by a cloth roller 32.
  • Step S4 referring to FIG. 3 and FIG. 4, the array substrate 1 and the color filter substrate 2 are aligned into a box, and liquid crystal molecules 4 are poured between the array substrate 1 and the color filter substrate 2, and are colored in the color film.
  • the touch electrode 5 is formed on a side of the substrate 2 away from the array substrate 1 , and the touch electrode 5 is a planar electrode continuously covering the color filter substrate 2 .
  • the liquid crystal molecules 4 in the step S4 form an initial pretilt angle having a large angle under the control of the alignment film 3 after the rubbing alignment treatment.
  • the material of the touch electrode 5 is Indium tin oxide (ITO).
  • Step S5 referring to FIG. 5, a voltage is applied between the touch electrode 5 and the common electrode 12, so that the liquid crystal molecules 4 between the array substrate 1 and the color filter substrate 2 are rotated to a position parallel to the array substrate 1, while The alignment film 3 is subjected to UV irradiation to polymerize the photosensitive small molecule compound 31 in the alignment film 3.
  • the position in which the liquid crystal molecules 4 are rotated in the step S5 to be parallel to the array substrate 1 means that the liquid crystal axis of the liquid crystal molecules 4 is parallel to the array substrate 1, and the liquid crystal molecules 4 are in touch.
  • the pre-tilt angle from the initial pretilt angle to the angle value of zero is controlled under the voltage control between the electrode 5 and the common electrode 12.
  • the voltage applied between the touch electrode 5 and the common electrode 12 in the step S5 is 5V to 15V.
  • the wavelength of the UV light that irradiates the alignment film 3 with UV light in the step S5 is 365 nm, and the energy is 30 mj to 100 mj.
  • the polymerization process of the photosensitive small molecule compound is as follows:
  • Step S6 referring to FIG. 6, after the polymerization of the photosensitive small molecule compound 31 is completed, the voltage between the touch electrode 5 and the common electrode 12 is removed, and UV illumination of the alignment film 3 is stopped, and the alignment film 3 is A plurality of polymer bumps 6 are formed on the surface, and the plurality of polymer bumps 6 keep the liquid crystal molecules 4 in parallel with the array substrate 1.
  • the photosensitive small molecule compound selected in the preferred embodiment of the present invention has a good adhesion to the alignment film 3, and the main structure of the binary ring plus the side chain alkyl group is similar to the liquid crystal molecule 4, and there is a comparison between the two.
  • Strong interaction force in the case of application of electric field and UV light irradiation, the photosensitive small molecule compound reacts and interacts with the contact surface liquid crystal molecules 4, so that the effect of fixing the liquid crystal molecules 4 is such that the pretilt angle is almost zero.
  • the alignment method of the invention can produce a smaller pretilt angle, reduce light leakage, and improve the contrast of the picture.
  • the invention can generate greater anchoring force and avoid liquid crystal display. Defects such as afterimages appear on the panel.
  • the present invention provides an alignment method of an FFS type liquid crystal display panel.
  • the method adds a photosensitive small molecule compound to a friction alignment material, and performs frictional alignment after formation of the alignment film, and then causes the FFS liquid crystal display panel to be formed.
  • a box after which a voltage is applied to rotate the liquid crystal molecules to a position parallel to the substrate, and the photosensitive small molecule compound is polymerized by UV light to form a polymer protrusion, so that the liquid crystal molecules remain parallel to the substrate, and the pretilt angle of the aligned liquid crystal molecules Zero, it can reduce the pretilt angle of liquid crystal molecules while maintaining the strong anchoring force of the alignment film, and improve the display quality of the FFS liquid crystal display panel.

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Abstract

一种FFS型液晶显示面板的配向方法。该方法在摩擦配向材料中加入感光小分子化合物（31），在配向膜（3）形成后先进行摩擦配向，随后使得FFS型液晶显示面板成盒，之后再施加电压使得液晶分子（4）旋转到与基板（1，2）平行的位置，并通过UV光照使得感光小分子化合物（31）聚合，形成聚合物凸起（6），使得液晶分子（4）保持与基板（1，2）平行，配向后的液晶分子（4）的预倾角为零，能够在保持配向膜强锚定力的前提下，降低液晶分子（4）的预倾角，提升FFS型液晶显示面板的显示品质。

Description

FFS型液晶显示面板的配向方法 技术领域
本发明涉及显示技术领域，尤其涉及一种FFS型液晶显示面板的配向方法。
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。
按照液晶的取向方式不同，目前主流市场上的液晶显示面板可以分为以下几种类型：垂直配向(Vertical Alignment，VA)型、扭曲向列(Twisted Nematic，TN)或超扭曲向列(Super Twisted Nematic，STN)型、平面转换(In-Plane Switching，IPS)型、及边缘场开关(Fringe Field Switching，FFS)型。
其中，FFS型液晶显示面板具有高穿透、广视角等优点，已被广泛应用于中小尺寸显示器，尤其以手机面板为主。所谓的FFS型液晶显示面板是利用边界电场使液晶盒(Cell)内的液晶(LC)分子在平行于基板的平面内旋转，产生光程差，在上下偏光片的作用下，达到显示效果。因此，FFS型液晶显示面板中液晶分子要进行水平配向，现有配向技术主要包括：摩擦配向(Rubbing)和光配向两种，其中，摩擦配向的具体方法为：通过一布毛滚轮在配向膜上刷磨出按一定方向排列的沟槽，使得液晶分子沿配向膜上的沟槽方向进行配向，该方法工艺简单，且配向后表现出良好的光电效果和热稳定性，但配向后的液晶分子预倾角较大，有一定程度的漏光，影响对比度。而光配向的方法为：在液晶材料中添加感光小分子化合物(Reactive Monomer，RM)，面板组成后，对面板施加电场，使液晶随着电场驱动方向转动成一定角度，再利用紫外(UV)光使液晶材料中RM在配向膜表面发生聚合反应，产生聚合物凸起(polymer bump)，达到配向效果，光配向工艺能有效降低液晶分子的预倾角，提升对比度，但其能耗高和且易产生由于配向膜表面锚定力较差导致的残像等不良，其应用也受到很大限制。
发明内容
本发明的目的在于提供一种FFS型液晶显示面板的配向方法，能够在保持配向膜强锚定力的前提下，降低液晶分子的预倾角，提升FFS型液晶显示面板的显示品质。
为实现上述目的，本发明提供了一种FFS型液晶显示面板的配向方法，包括如下步骤：
步骤S1、提供摩擦配向材料、光起始剂、以及感光小分子化合物，将所述摩擦配向材料、光起始剂、以及感光小分子化合物混合得到配向膜材料；
步骤S2、提供阵列基板和彩膜基板，在所述彩膜基板和阵列基板上分别涂布并固化配向膜材料，形成两配向膜；
所述阵列基板包括：衬底基板、设于衬底基板上的公共电极、设于公共电极上的绝缘层、设于所述绝缘层上的像素电极；所述公共电极为连续覆盖衬底基板的平面电极，所述像素电极为具有狭缝的图案化电极；
步骤S3、对所述配向膜进行摩擦配向处理；
步骤S4、将所述阵列基板和彩膜基板对位成盒，在所述阵列基板与彩膜基板之间灌入液晶，并在彩膜基板远离所述阵列基板的一侧形成触控电极，所述触控电极为连续覆盖彩膜基板的平面电极；
步骤S5、在所述触控电极与公共电极之间施加电压，使得阵列基板与彩膜基板之间的液晶旋转到与阵列基板平行的位置，同时对所述配向膜进行UV光照，使得配向中的感光小分子化合物聚合；
步骤S6、感光小分子化合物聚合完全后，撤去在所述触控电极与公共电极之间的电压，并停止对配向膜进行UV光照，所述配向膜的表面形成多个聚合物凸起，所述多个聚合物凸起使得所述液晶保持与阵列基板平行。
所述配向膜材料中光起始剂的重量百分比为0.1wt％～1wt％。
所述配向膜材料中感光小分子化合物的重量百分比为0.1wt％～2wt％。
所述感光小分子化合物为聚芳酯类小分子。
所述感光小分子化合物的化学式为：
Figure PCTCN2017089267-appb-000001
所述摩擦配向材料为聚酰亚胺。
所述步骤S2中通过烘烤制程固化所述配向膜材料，所述烘烤制程的温度为120℃～200℃，时间为15～60分钟。
所述步骤S5中施加在触控电极与公共电极之间的电压大小为5V～15V。
所述步骤S5中对所述配向膜进行UV光照的UV光的波长为365nm，能量为30mj～100mj。
所述触控电极的材料为ITO。
本发明还提供一种FFS型液晶显示面板的配向方法，包括如下步骤：
步骤S1、提供摩擦配向材料、光起始剂、以及感光小分子化合物，将所述摩擦配向材料、光起始剂、以及感光小分子化合物混合得到配向膜材料；
步骤S2、提供阵列基板和彩膜基板，在所述彩膜基板和阵列基板上分别涂布并固化配向膜材料，形成两配向膜；
所述阵列基板包括：衬底基板、设于衬底基板上的公共电极、设于公共电极上的绝缘层、设于所述绝缘层上的像素电极；所述公共电极为连续覆盖衬底基板的平面电极，所述像素电极为具有狭缝的图案化电极；
步骤S3、对所述配向膜进行摩擦配向处理；
步骤S4、将所述阵列基板和彩膜基板对位成盒，在所述阵列基板与彩膜基板之间灌入液晶分子，并在彩膜基板远离所述阵列基板的一侧形成触控电极，所述触控电极为连续覆盖彩膜基板的平面电极；
步骤S5、在所述触控电极与公共电极之间施加电压，使得阵列基板与彩膜基板之间的液晶分子旋转到与阵列基板平行的位置，同时对所述配向膜进行UV光照，使得配向膜中的感光小分子化合物聚合；
步骤S6、感光小分子化合物聚合完全后，撤去在所述触控电极与公共电极之间的电压，并停止对配向膜进行UV光照，所述配向膜的表面形成多个聚合物凸起，所述多个聚合物凸起使得所述液晶分子保持与阵列基板平行；
其中，所述配向膜材料中光起始剂的重量百分比为0.1wt％～1wt％；
其中，所述配向膜材料中感光小分子化合物的重量百分比为0.1wt％～2wt％。
本发明的有益效果：本发明提供一种FFS型液晶显示面板的配向方法，该方法在摩擦配向材料中加入感光小分子化合物，在配向膜形成后先进行摩擦配向，随后使得FFS型液晶显示面板成盒，之后再施加电压使得液晶分子旋转到与基板平行的位置，并通过UV光照使得感光小分子化合物聚 合，形成聚合物凸起，使得液晶分子保持与基板平行，配向后的液晶分子的预倾角为零，能够在保持配向膜强锚定力的前提下，降低液晶分子的预倾角，提升FFS型液晶显示面板的显示品质。
附图说明
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。
附图中，
图1和图2为本发明的FFS型液晶显示面板的配向方法的步骤S2和步骤S3的示意图；
图3和图4为本发明的FFS型液晶显示面板的配向方法的步骤S4的示意图；
图5为本发明的FFS型液晶显示面板的配向方法的步骤S5的示意图；
图6为本发明的FFS型液晶显示面板的配向方法的步骤S6的示意图；
图7为本发明的FFS型液晶显示面板的配向方法的流程图。
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7，本发明提供一种FFS型液晶显示面板的配向方法，包括如下步骤：
步骤S1、提供摩擦配向材料、光起始剂、以及感光小分子化合物，将所述摩擦配向材料、光起始剂、以及感光小分子化合物混合得到配向膜材料。
具体地，所述配向膜材料中光起始剂的重量百分比为0.1wt％～1wt％，所述配向膜材料中感光小分子化合物的重量百分比为0.1wt％～2wt％。
具体地，所述摩擦配向材料为普通的摩擦配向中采用的配向膜的材料，优选地，所述摩擦配向材料为聚酰亚胺(Polyimide，PI)，所述感光小分子化合物为聚芳酯类小分子，优选地，所述感光小分子化合物的化学式如下：
Figure PCTCN2017089267-appb-000002
步骤S2、如图1和图2所示，提供阵列基板1和彩膜基板2，在所述彩膜基板2和阵列基板1上分别涂布并固化配向膜材料，形成两配向膜3。
具体地，所述阵列基板1包括：衬底基板11、设于衬底基板11上的公共电极12、设于公共电极12上的绝缘层13、设于所述绝缘层13上的像素电极14。所述彩膜基板3的结构不限，任意适用于FFS型液晶显示面板的彩膜基板均可以使用，此处不再详细叙述。
更具体地，所述公共电极12为连续覆盖衬底基板11的平面电极，所述像素电极14为具有狭缝的图案化电极，从而通过公共电极12和像素电极14产生边缘场电场，以驱动液晶分子在平行于基板的平面内旋转。
详细地，所述步骤S2中通过烘烤制程固化所述配向膜材料，所述烘烤制程的温度为120℃～200℃，时间为15～60分钟。所述配向膜3中分布有若干感光小分子化合物31。
步骤S3、如图1和图2所示，对所述配向膜3进行摩擦配向处理。
具体地，所述步骤S3具体为通过一布毛滚轮32在配向膜3上刷磨出按一定方向排列的沟槽。
步骤S4、请参阅图3和图4，将所述阵列基板1和彩膜基板2对位成盒，在所述阵列基板1与彩膜基板2之间灌入液晶分子4，并在彩膜基板2远离所述阵列基板1的一侧形成触控电极5，所述触控电极5为连续覆盖彩膜基板2的平面电极。
具体地，所述步骤S4中的液晶分子4在摩擦配向处理后的配向膜3的控制下，形成一角度较大的初始预倾角。所述触控电极5的材料为氧化铟锡(Indium tin oxide，ITO)。
步骤S5、请参阅图5，在所述触控电极5与公共电极12之间施加电压，使得阵列基板1与彩膜基板2之间的液晶分子4旋转到与阵列基板1平行的位置，同时对所述配向膜3进行UV光照，使得配向膜3中的感光小分子化合物31聚合。
具体地，所述步骤S5中液晶分子4旋转到与阵列基板1平行的位置指的是所述液晶分子4的液晶轴与阵列基板1平行，所述液晶分子4在触控 电极5与公共电极12之间的电压控制下从初始预倾角旋转到角度值为零的预倾角。
具体地，所述步骤S5中施加在触控电极5与公共电极12之间的电压大小为5V～15V。所述步骤S5中对所述配向膜3进行UV光照的UV光的波长为365nm，能量为30mj～100mj。
具体地，在本发明的优选实施例中，所述感光小分子化合物聚合反应的过程如下：
Figure PCTCN2017089267-appb-000003
步骤S6、请参阅图6，感光小分子化合物31聚合完全后，撤去在所述触控电极5与公共电极12之间的电压，并停止对配向膜3进行UV光照，所述配向膜3的表面形成多个聚合物凸起6，所述多个聚合物凸起6使得所述液晶分子4保持与阵列基板1平行。
具体地，本发明的优选实施例中所选用的感光小分子化合物与配向膜3有良好接着力，且其主体结构二元环加侧链烷基与液晶分子4类似，两者之间有较强相互作用力，在施加电场和UV光照射的情况下，感光小分子化合物反应且与相接触的表层液晶分子4相互作用，达到使得液晶分子4固定的效果使其预倾角几乎为零，相比于单一的摩擦配向，本发明的配向方法能够产生更小的预倾角，减小漏光，提升画面的对比度，相比于单一的光配向，本发明能够产生更大锚定力，避免液晶显示面板出现残像等不良。
综上所述，本发明提供一种FFS型液晶显示面板的配向方法，该方法在摩擦配向材料中加入感光小分子化合物，在配向膜形成后先进行摩擦配向，随后使得FFS型液晶显示面板成盒，之后再施加电压使得液晶分子旋转到与基板平行的位置，并通过UV光照使得感光小分子化合物聚合，形成聚合物凸起，使得液晶分子保持与基板平行，配向后的液晶分子的预倾角为零，能够在保持配向膜强锚定力的前提下，降低液晶分子的预倾角，提升FFS型液晶显示面板的显示品质。
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 (18)

  1. 一种FFS型液晶显示面板的配向方法，包括如下步骤：
    步骤S1、提供摩擦配向材料、光起始剂、以及感光小分子化合物，将所述摩擦配向材料、光起始剂、以及感光小分子化合物混合得到配向膜材料；
    步骤S2、提供阵列基板和彩膜基板，在所述彩膜基板和阵列基板上分别涂布并固化配向膜材料，形成两配向膜；
    所述阵列基板包括：衬底基板、设于衬底基板上的公共电极、设于公共电极上的绝缘层、设于所述绝缘层上的像素电极；所述公共电极为连续覆盖衬底基板的平面电极，所述像素电极为具有狭缝的图案化电极；
    步骤S3、对所述配向膜进行摩擦配向处理；
    步骤S4、将所述阵列基板和彩膜基板对位成盒，在所述阵列基板与彩膜基板之间灌入液晶分子，并在彩膜基板远离所述阵列基板的一侧形成触控电极，所述触控电极为连续覆盖彩膜基板的平面电极；
    步骤S5、在所述触控电极与公共电极之间施加电压，使得阵列基板与彩膜基板之间的液晶分子旋转到与阵列基板平行的位置，同时对所述配向膜进行UV光照，使得配向膜中的感光小分子化合物聚合；
    步骤S6、感光小分子化合物聚合完全后，撤去在所述触控电极与公共电极之间的电压，并停止对配向膜进行UV光照，所述配向膜的表面形成多个聚合物凸起，所述多个聚合物凸起使得所述液晶分子保持与阵列基板平行。
  2. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述配向膜材料中光起始剂的重量百分比为0.1wt％～1wt％。
  3. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述配向膜材料中感光小分子化合物的重量百分比为0.1wt％～2wt％。
  4. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述感光小分子化合物为聚芳酯类小分子。
  5. 如权利要求4所述的FFS型液晶显示面板的配向方法，其中，所述 感光小分子化合物的化学式为：
    Figure PCTCN2017089267-appb-100001
  6. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述摩擦配向材料为聚酰亚胺。
  7. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述步骤S2中通过烘烤制程固化所述配向膜材料，所述烘烤制程的温度为120℃～200℃，时间为15～60分钟。
  8. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述步骤S5中施加在触控电极与公共电极之间的电压大小为5V～15V。
  9. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述步骤S5中对所述配向膜进行UV光照的UV光的波长为365nm，能量为30mj～100mj。
  10. 如权利要求1所述的FFS型液晶显示面板的配向方法，其中，所述触控电极的材料为ITO。
  11. 一种FFS型液晶显示面板的配向方法，包括如下步骤：
    步骤S1、提供摩擦配向材料、光起始剂、以及感光小分子化合物，将所述摩擦配向材料、光起始剂、以及感光小分子化合物混合得到配向膜材料；
    步骤S2、提供阵列基板和彩膜基板，在所述彩膜基板和阵列基板上分别涂布并固化配向膜材料，形成两配向膜；
    所述阵列基板包括：衬底基板、设于衬底基板上的公共电极、设于公共电极上的绝缘层、设于所述绝缘层上的像素电极；所述公共电极为连续覆盖衬底基板的平面电极，所述像素电极为具有狭缝的图案化电极；
    步骤S3、对所述配向膜进行摩擦配向处理；
    步骤S4、将所述阵列基板和彩膜基板对位成盒，在所述阵列基板与彩膜基板之间灌入液晶分子，并在彩膜基板远离所述阵列基板的一侧形成触控电极，所述触控电极为连续覆盖彩膜基板的平面电极；
    步骤S5、在所述触控电极与公共电极之间施加电压，使得阵列基板与彩膜基板之间的液晶分子旋转到与阵列基板平行的位置，同时对所述配向 膜进行UV光照，使得配向膜中的感光小分子化合物聚合；
    步骤S6、感光小分子化合物聚合完全后，撤去在所述触控电极与公共电极之间的电压，并停止对配向膜进行UV光照，所述配向膜的表面形成多个聚合物凸起，所述多个聚合物凸起使得所述液晶分子保持与阵列基板平行；
    其中，所述配向膜材料中光起始剂的重量百分比为0.1wt％～1wt％；
    其中，所述配向膜材料中感光小分子化合物的重量百分比为0.1wt％～2wt％。
  12. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述感光小分子化合物为聚芳酯类小分子。
  13. 如权利要求12所述的FFS型液晶显示面板的配向方法，其中，所述感光小分子化合物的化学式为：
    Figure PCTCN2017089267-appb-100002
  14. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述摩擦配向材料为聚酰亚胺。
  15. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述步骤S2中通过烘烤制程固化所述配向膜材料，所述烘烤制程的温度为120℃～200℃，时间为15～60分钟。
  16. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述步骤S5中施加在触控电极与公共电极之间的电压大小为5V～15V。
  17. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述步骤S5中对所述配向膜进行UV光照的UV光的波长为365nm，能量为30mj～100mj。
  18. 如权利要求11所述的FFS型液晶显示面板的配向方法，其中，所述触控电极的材料为ITO。
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