A kind of flexible cover plate of display panel and preparation method thereof, display deviceTechnical field
The present invention relates to display field, in particular to a kind of flexible cover plate of display panel and preparation method thereof, displayDevice.
Background technique
Currently, folding flexibility Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) is againReferred to as Organic Electricity laser display, organic luminous semiconductor display device are launched successively, cause that industry and consumer's is wideGeneral concern.To take into account bent and durability, folding flexible organic light emitting diode display part outermost layer mostly uses softProperty Cover window (covering window) or Cover glass (cover glass) be used as outermost layer protective layer.These materials existOn the basis of taking into account bent performance, while needing to have good optical property (transmitance is high, and Huang value and mist degree are small), andWith high hardness, scratch-resistant and impact resistance.
With the progress of display technology, the screen of smart terminal product (such as mobile phone, tablet computer) also experiencings hugeVariation.Take the mobile phone as an example: the development of mobile phone screen is descending, by directly bent, then to screen, foldable screen comprehensively, foldableScreen is the important technology direction of the following smart terminal product development.
The realization of the folding functional of smart terminal product needs display screen to have the ability bent repeatedly, and bends not shadowDisplay function is rung, the display screen for having the function is properly termed as flexible display screen.However existing composition smart terminal productThe material surface hardness of flexible die group (flexible die group includes above-mentioned flexible display screen, and flexible display screen is alternatively referred to as display layer)It is low, intensity is weak, in order to improve the service life of flexible die group, user should be avoided and directly operated in the flexible die group, needThere are the protection of cover board, therefore the ability that cover board also there must be enough rigidity and can bend repeatedly.
With the development of display technology, nowadays display device application field is very extensive, therefore for shielding body itemsIt can require also to gradually rise.Flexible screen body has the characteristics that bent, and using the flexibility of display device, people can will display dressIt sets and is bent or folded, offer convenience to carry and use display device to people.The wearable of flexible display panels is shownShowing device is also increasingly valued by people, and is shown important application potential in fields such as amusements, is also included in the industryMain competitive market.
Common flexible cover plate material is as shown in Figure 1, mostly by flexible substrates, (CPI, (transparent polyimides), PET are (poly-Ethylene glycol terephthalate) etc.) coating hard coating (Surface hardening treatment) material constitute, by adjusting substrate withHard coating (Surface hardening treatment) layer material thickness, modulus or cure process etc., to take into account the flexibility and rigidity of material.Display device long-time use process does not require nothing more than good bending performance, at the same must receive external force it is long when abrasion and scrape,This also challenges to flexible cover plate material.However, flexible parent metal is thicker, cost is higher, and crooked process radius is bigger, to bending performanceChallenge it is bigger；Cementation zone and Anti-scratching coating are chosen while increasing crooked process radius, and to interlayer adhesion force propositionWar.
Summary of the invention
The technical solution to solve the above problems is: the present invention provides a kind of flexible cover plates of display panel, including basePlate；Protective layer is set on the substrate；It wherein, include several ribbons in the protective layer, several ribbons are parallel to each other mistakeFall arrangement.
Further, the material of the substrate include transparent polyimides, in polyethylene terephthalate extremelyFew one kind.
Further, the material of the protective layer is zirconium oxide or boron nitride.
Further, the material of the ribbon is polyurethane fiber.
The present invention also provides a kind of preparation methods of the flexible cover plate of display panel, comprising:
S1) one substrate is provided；
S2) spin coating protective layer solution on the substrate；
S3) pass through anti-solvent method spin coating ribbon solution on the protective layer solution；
S4) after the protective layer solution and the ribbon solution are dry, the phase in protective layer and protective layer is formedThe mutually ribbon of parallel arrangement straggly.
Further, the protective layer solution is zirconium oxide or nitridation B solution.
Further, in the step S2) in, pass through anti-solvent method spin coating protective layer solution on the substrate.
Further, the mass fraction of the middle zirconium oxide of the protective layer solution or boron nitride is 2%~5%.
Further, the ribbon solution is the polyurethane solutions for being dissolved in dimethyl sulfoxide.
The present invention also provides a kind of display panel, the flexible cover plate including the display panel.
The invention has the advantages that flexible cover plate of display panel of the invention and preparation method thereof, display device pass throughProtective layer is set to improve the tensile strength of flexible cover plate on flexible substrates, that is, promotes the rigidity of flexible cover plate, can improveIts scratch performance, the material of protective layer use zirconium oxide, the materials such as boron nitride, and chemical property is stablized, high-intensitive, high rigidity,Coefficient of friction is small.Several ribbons parallel with flexible base board length direction are set in protective layer, and ribbon uses polyurethaneFiber is the polymer material of high-modulus, can effectively promote the scraping and wiping resistance performance of material, while polyurethane fiber is total for blockPolymers is alternately made of soft segment and rigid chain segment.Flexibility chain is easy deformation under stress, and can be stretched deformation；Rigid chain segment does not generate deformation under stress, can prevent horizontal sliding, it is made to have enough resiliences, preparation of the inventionMethod uses spin coating proceeding, simple to operation.
Detailed description of the invention
The present invention is further explained with reference to the accompanying drawings and examples.
Fig. 1 is the flexible cover plate schematic diagram in background technique.
Fig. 2 is the flexible cover plate schematic diagram in embodiment.
Fig. 3 is the display panel schematic diagram in embodiment.
In figure
1 display panel；
10 flexible cover plates；110 substrates；
120 protective layers；121 ribbons；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, those skilled in the art's every other implementation obtained without creative effortsExample, shall fall within the protection scope of the present invention.
Description and claims of this specification and term " first " in above-mentioned attached drawing, " second ", " third " etc.(if present) is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be appreciated that thisThe object of sample description is interchangeable under appropriate circumstances.In addition, term " includes " and " having " and their any deformation, meaningFigure, which is to cover, non-exclusive includes.
Embodiment 1
As shown in Fig. 2, flexible cover plate 10 of the invention includes substrate 110 and protective layer 120 in the present embodiment.
The flexible cover plate 10 is transparent display cover board, the surface of 1 touch screen of display panel is mainly located in, for protectingThe display panel 1, prevents display panel 1 in use, due to scraping or bending to cause the use of display panel 1Service life reduces.
The substrate 110 be flexible base board, material can for CPI (inorganic transparent polyimides), PE (polyethylene) andOne of PMMA (polymethyl methacrylate) or a variety of.
There is CPI (inorganic transparent polyimides) high transmissivity (up to 99%) and high-wear resistance (to pass through 25 timesAfter circulation friction, 0.1%) transmitance of film only declines, high degree protects the display panel 1, improves the displayThe service life of panel 1.
The substrate with a thickness of 20~200 microns so that guarantee flexible display screen cover board have both bendable folding endurance, anti-impactWhile hitting property and stiffness, the integral thickness of flexible display screen cover board is unlikely to too thin, if too thin, flexible display screen cover boardIt is easy demoulding.
The protective layer 120 is set on the substrate 110, and the protective layer 120 uses zirconium oxide or boron nitride material, oxygenChange zirconium have high-melting-point, high resistivity, high refractive index and low thermal coefficient of expansion property, be good high temperature resistant and wear-resisting materialMaterial, boron nitride is zincblende lattce structure, has good thermal conductivity.Hardness is only second to diamond, is a kind of superhard material, can be withThe substrate 10 is effectively protected, prevents it from wearing in bending or scraping.
Due to the flexible cover plate 10 use flexible material, in use, the reliability of the flexible cover plate 10 andDurability, which becomes, measures the key factor that can product be quickly obtained market, and the display panel 1 using the flexible cover plate 10 existsIn bending process, the flexible cover plate 10 is used as outermost protective device, and the performance coupled hardness with softness is by most directly choosingWar, the flexible cover plate 10 will receive the double action of stretching and compression in the process of bending, meanwhile, it can be adjoint in bending processThe phase mutual friction between 10 material of flexible cover plate.
It include several ribbons 121 in the protective layer 120 of the invention in the present embodiment, the ribbon 121 is mutuallyParallel arrangement straggly, arragement direction are consistent with the length direction of the substrate 10.Using in the protective layer 120, institute is setStating ribbon 121 can be improved the tensile strength of the protective layer 120, promote the rigidity of the flexible cover plate 10, improve bendingPerformance.
The ribbon 121 uses polyurethane fiber, and polyurethane fiber is block copolymer, by soft segment and rigid chainSection alternately forms.Flexibility chain is easy deformation under stress, and can be stretched deformation；Rigid chain segment does not produce under stressRaw deformation, can prevent horizontal sliding, it is made to have enough resiliences.It is the polymer material of high-modulus simultaneously, can receivedExternal force is quickly eliminated after generating scratch to external force, eliminates scratch in a short time, using the polymer material of high-modulus,The scratch-resistant ability and bend resistance ability of the flexible cover plate 10 can effectively be promoted.
In order to preferably illustrate the present invention, the present embodiment provides a kind of preparation side for preparing the flexible cover plate 10Method, step include S1)~S4).
S1) one substrate 110 is provided；
S2) 120 solution of spin coating protective layer on the substrate 110, can also be by anti-solvent method on the substrate 110120 solution of spin coating protective layer, 120 solution of protective layer are zirconium oxide or nitridation B solution, wherein the protective layer 120 is moltenThe mass fraction of zirconium oxide or boron nitride is 2%~5% in liquid；
S3) molten by anti-solvent method 121 solution of spin coating ribbon, ribbon 121 on 120 solution of protective layerLiquid is the polyurethane solutions for being dissolved in dimethyl sulfoxide, and by adjusting the concentration of polyurethane, mixed solvent, spin coating atmosphere, revolving speed addsEnter the time of anti-solvent to regulate and control the dispersion amount of the i.e. described ribbon 121 of polyurethane fiber；
S4) after 120 solution of protective layer and 121 solution of the ribbon are dry, protective layer 120 and protection are formedThe ribbon 121 of the arrangement straggly that is parallel to each other in layer 120.
As shown in figure 3, the present invention also provides a kind of display panel 1, main improvement and feature are embodied a concentrated reflection ofOn the flexible cover plate 10, for the other component of display panel 1, just no longer repeat one by one.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention andMade any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.