WO2021243878A1 - 显示面板其制备方法 - Google Patents

显示面板其制备方法 Download PDF

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Publication number
WO2021243878A1
WO2021243878A1 PCT/CN2020/114712 CN2020114712W WO2021243878A1 WO 2021243878 A1 WO2021243878 A1 WO 2021243878A1 CN 2020114712 W CN2020114712 W CN 2020114712W WO 2021243878 A1 WO2021243878 A1 WO 2021243878A1
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WIPO (PCT)
Prior art keywords
layer
display panel
display
flexible substrate
cover plate
Prior art date
Application number
PCT/CN2020/114712
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English (en)
French (fr)
Inventor
董文伯
侯晓萌
白全明
Original Assignee
武汉华星光电半导体显示技术有限公司
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US17/054,787 priority Critical patent/US11737344B2/en
Publication of WO2021243878A1 publication Critical patent/WO2021243878A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0084—Foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B32B2264/108—Carbon, e.g. graphite particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the invention relates to the field of display devices, in particular to a method for manufacturing a display panel.
  • OLED OrganicLight-Emitting Diode, organic electroluminescence display
  • OLED OrganicLight-Emitting Diode, organic electroluminescence display
  • the display functional layers are bonded together by OCA (Optical Adhesive) adhesive layer.
  • the OCA adhesive layer has a higher proportion in the stack structure, which maintains the stability and recovery of the module structure during the bending process. It plays a vital role in terms of bending life, and is the key structural functional layer to prevent the peeling of each functional layer.
  • the failure of the OCA adhesive layer is one of the main obstacles restricting the application of the bending display.
  • due to repeated folding permanent creases are left on the surface of the display, which limits the service life and user experience of the product.
  • the purpose of the present invention is to provide a method for manufacturing a display panel, so as to solve the problems of peeling off and insufficient recovery of the flexible module stack structure in the prior art.
  • the present invention provides a display panel including a flexible substrate layer, a display layer, a touch layer, a polarizer, a cover plate, a buffer layer, and/or at least one bonding layer.
  • the display layer is arranged on the flexible substrate layer.
  • the touch control layer is arranged on a surface of the display layer away from the flexible substrate layer.
  • the polarizer is arranged on a surface of the touch control layer away from the display layer.
  • the cover plate is arranged on a surface of the polarizer away from the touch layer.
  • the buffer layer is arranged on a surface of the flexible substrate layer away from the display layer, and the buffer layer has a material with a Poisson's ratio less than 0.1.
  • the laminated layer is arranged between two adjacent layers in the layered structure of the display panel, and the laminated layer has a material with a Poisson's ratio less than 0.1.
  • the material of the buffer layer includes polyurethane foam material and white carbon black particles.
  • the material of the bonding layer includes at least one of a polyurethane-based optical glue, an acrylic-based optical glue, and a rubber-based optical glue.
  • a polyurethane-based optical glue an acrylic-based optical glue
  • a rubber-based optical glue a polyurethane-based optical glue
  • the side groups of the chemical groups of the polyurethane-based optical glue, acrylic-based optical glue, and rubber-based optical glue have liquid crystal molecules.
  • the display panel has a bending direction, and the bending direction is toward the flexible substrate layer or toward the cover plate.
  • the display panel further includes a first protective layer and a second protective layer.
  • the first protective layer It is arranged between two adjacent layers in the display panel layered structure or on the side of the flexible substrate layer away from the display layer or on the side of the cover plate away from the polarizer.
  • the second protective layer is arranged between two adjacent layers in the display panel layered structure or on the side of the flexible substrate layer away from the display layer or on the cover plate away from the polarizer On the side. At least one of the flexible substrate layer, the display layer, the touch layer, the polarizer, and the cover plate is located between the first protective layer and the second protective layer.
  • the first protective layer has a material with a Poisson's ratio less than 0.1
  • the second protective layer has a material with a positive Poisson's ratio.
  • the areas of the flexible substrate layer, the display layer, the touch layer, the polarizer, and the cover plate are all smaller than the area of the first protective layer or the second protective layer.
  • the first protective layer is provided on a side of the display panel that is close to the flexible substrate layer, and the second protective layer is provided on the flexible substrate layer.
  • the first protective layer is disposed on the side of the display panel close to the cover plate, and the second protective layer is disposed on the display panel close to the cover plate. Said one side of the flexible substrate layer.
  • the embodiment of the present invention also provides a method for manufacturing a display panel, which includes the following steps:
  • a display layer, a touch control layer, a polarizer and a cover plate are sequentially formed on the flexible substrate layer.
  • a buffer layer is formed on a surface of the flexible substrate layer away from the display layer, and/or a bonding layer is formed between two adjacent layers in the display panel layered structure.
  • the buffer layer and the bonding layer have materials with Poisson's ratio less than 0.1.
  • the material of the buffer layer includes polyurethane foam material and white carbon black particles.
  • the step of forming a buffer layer on a surface of the flexible substrate layer away from the display layer includes the following steps:
  • the foaming material is formed by adding a foaming material through a one-step foaming process, and the foaming material contains white carbon black particles.
  • the foam material is compressed under the condition that the pressure is less than 21 MPa. After the pressure is locked, the foam material is allowed to stand for 1-2 hours under the condition that the temperature is greater than 25°C and less than 140°C. After the standing, the foam material is taken out and cooled to room temperature to form a polyurethane foam material.
  • the material of the bonding layer includes at least one of a polyurethane-based optical glue, an acrylic-based optical glue, and a rubber-based optical glue.
  • a polyurethane-based optical glue an acrylic-based optical glue
  • a rubber-based optical glue a polyurethane-based optical glue
  • the side groups of the chemical groups of the polyurethane-based optical glue, acrylic-based optical glue, and rubber-based optical glue have liquid crystal molecules.
  • the step of forming a bonding layer between two adjacent layers in the display panel layered structure includes the following steps:
  • the small molecule liquid crystal is added to the first compound, and the alcohol esterified product is obtained after full reaction.
  • the alcohol esterified product is mixed with the second compound to obtain a polymerized monomer mixture.
  • An azo initiator is added to the polymerized monomer mixture to initiate free radical homogeneous polymerization to obtain a modified first compound.
  • the modified first compound is processed through a polymer uniaxial stretching orientation process to obtain an optical glue with liquid crystal molecules in side groups.
  • the first compound may be one of polyurethane, acrylate, and rubber.
  • the second compound is an alcohol esterification product.
  • the advantages of the present invention are: a display panel and a preparation method thereof of the present invention prolong the service life of the display panel by using a negative Poisson's ratio material with a Poisson's ratio less than 0.1, and use the material characteristics of the negative Poisson's ratio to improve the performance of the film. Impact resistance, improve the toughness of the film layer, thereby improving the stability of the display panel.
  • FIG. 1 is a schematic diagram of a layered structure of a display panel in Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of the layered structure of the display panel in Embodiment 2 of the present invention.
  • FIG. 3 is a schematic diagram of the layered structure of the display panel in Embodiment 3 of the present invention.
  • FIG. 4 is a schematic diagram of the layered structure of the display panel in Embodiment 4 of the present invention.
  • FIG. 5 is a schematic diagram of the bending of the first protective layer in Embodiment 3 or 4 of the present invention.
  • FIG. 6 is a schematic diagram of the bending of the second protective layer in Embodiment 3 or 4 of the present invention.
  • Buffer layer 70 first protective layer 80;
  • the second protective layer 90 The second protective layer 90.
  • the part When some part is described as being “on” another part, the part may be directly placed on the other part; there may also be an intermediate part on which the part is placed, And the middle part is placed on another part.
  • a component When a component is described as “installed to” or “connected to” another component, both can be understood as directly “installed” or “connected”, or a component is indirectly “mounted to” or “connected to” through an intermediate component To" another part.
  • An embodiment of the present invention provides a display panel 100.
  • the display panel 100 includes a flexible substrate layer 10, a display layer 20, a touch layer 30, a polarizer 40, and a cover plate. 50 and a four-layer bonding layer 60.
  • the flexible substrate layer 10 is a polyimide (PI) layer, which ensures that the display panel 100 has a bendable and flexible feature.
  • PI polyimide
  • the display layer 20 is arranged on the flexible substrate layer 10, which is composed of a number of OLEDs (Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • OLEDs Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • the display panel 100 realizes the display of color images through the display layer 20.
  • the touch layer 30 is disposed on a surface of the display layer 20 away from the flexible substrate layer 10.
  • the touch layer 30 has a number of traces and pressure sensors, which are used to sense pressure changes received by the display panel 100 to generate touch signals to realize touch control.
  • the polarizer 40 is disposed on a surface of the touch layer 30 away from the display layer 20.
  • the polarizer 40 is used for subjecting the light emitted by the organic electroluminescent layer to polarization processing, so as to generate a contrast between light and darkness, and realize the display of the picture.
  • the cover plate 50 is a glass substrate, which is disposed on a surface of the polarizer 40 away from the touch layer 30.
  • the cover plate 50 is used to protect the overall structure of the display panel 100, while achieving flexible bending, it can also improve the flatness and impact resistance of the surface of the display panel 100, and improve the texture of the display screen.
  • bonding layers 60 which are respectively provided between the flexible substrate layer 10 and the display layer 20, between the display layer 20 and the touch layer 30, and Between the control layer 30 and the polarizer 40 and between the polarizer 40 and the cover plate 50.
  • the bonding layer 60 is used to improve the adhesion between the film layer and the film layer.
  • the bonding layer 60 adopts a negative Poisson's ratio optical glue with a Poisson's ratio less than 0.1.
  • the optical glue may be one of polyurethane optical glue, acrylic optical glue, and rubber optical glue, and the polyurethane optical glue, the acrylic optical glue, and the rubber-based optical glue have chemical groups.
  • the bending part of the optical glue with a Poisson's ratio less than 0.1 will flow in the reverse direction. This reverse flow stress can resist the flow phenomenon of the glue material during the bending process. It prevents the plastic deformation of the bonding layer 60 caused by repeated bending, further improves the adhesion between the film layer and the film layer, and avoids the phenomenon of the hair component layer falling off.
  • the embodiment of the present invention also provides a method for manufacturing the above-mentioned display panel 100, which has the following manufacturing steps:
  • Step S10) Provide a flexible substrate layer 10:
  • the flexible substrate layer 10 is a polyimide layer, which is prepared by methods such as deposition and coating.
  • Step S20) A display layer 20, a touch layer 30, a polarizer 40 and a cover plate 50 are sequentially formed on the flexible substrate layer 10:
  • the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50 are prepared in advance. Coat a layer of bonding layer 60 material on the flexible substrate layer 10, attach the display layer 20 on the bonding layer 60, and cure the bonding layer 60 material by ultraviolet light irradiation to form The bonding layer 60.
  • the touch layer 30, the polarizer 40, and the cover plate 50 are sequentially attached to the display layer 20 via the laminating layer 60 to form the display panel 100.
  • the bonding layer 60 adopts acrylic optical glue with liquid crystal molecules in side groups, and the preparation method of the acrylic optical glue is as follows:
  • the small molecule liquid crystal is added to the first compound, and the alcohol ester compound is obtained after full reaction.
  • the alcohol ester compound is mixed with a second compound, and the second compound is an alcohol esterified product, such as polymethyl acrylate, to obtain a polymerized monomer mixture.
  • an azo initiator is added to the polymerized monomer mixture, and the azo initiator initiates free radical homogeneous polymerization to obtain a modified first compound with a side group carrying liquid crystal molecules.
  • the modified first compound is oriented through a polymer uniaxial stretching treatment, and the stretching direction is a negative Poisson's ratio direction to increase the degree of molecular orientation, and finally an acrylic optical glue with liquid crystal molecules in the side groups is obtained.
  • the first compound used in the embodiments of the present invention is acrylate.
  • materials such as polyurethane and rubber can also be used to prepare polyurethane-based optical adhesives or rubber-based optical adhesives.
  • the preparation method is the same as The embodiments of the present invention are similar, so they will not be repeated here. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.
  • a material with a Poisson's ratio less than 0.1 is used for bonding between the film layers.
  • this material is subjected to bending and extrusion, reverse flow will occur, and the stress generated by this reverse flow can resist
  • the flow phenomenon of the adhesive material during the bending process prevents the deformation of the bonding layer 60, and also avoids the phenomenon of cracking of the bonding layer 60 caused by the second deformation, and further improves the adhesion between the film layer and the film layer. Strength, avoid the phenomenon of the hair component layer falling off, and improve the stability of the display panel 100.
  • the display panel 100 includes a flexible substrate layer 10, a display layer 20, a touch layer 30, a polarizer 40, and a cover plate. 50 and a buffer layer 70.
  • the flexible substrate layer 10 is a polyimide (PI) layer, which ensures that the display panel 100 has a bendable and flexible feature.
  • PI polyimide
  • the display layer 20 is arranged on the flexible substrate layer 10, which is composed of a number of OLEDs (Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • OLEDs Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • the display panel 100 realizes the display of color images through the display layer 20.
  • the touch layer 30 is disposed on a surface of the display layer 20 away from the flexible substrate layer 10.
  • the touch layer 30 has a number of traces and pressure sensors, which are used to sense pressure changes received by the display panel 100 to generate touch signals to realize touch control.
  • the polarizer 40 is disposed on a surface of the touch layer 30 away from the display layer 20.
  • the polarizer 40 is used for subjecting the light emitted by the organic electroluminescent layer to polarization processing, so as to generate a contrast between light and darkness, and realize the display of the picture.
  • the cover plate 50 is a glass substrate, which is disposed on a surface of the polarizer 40 away from the touch layer 30.
  • the cover plate 50 is used to protect the overall structure of the display panel 100, while achieving flexible bending, it can also improve the flatness and impact resistance of the surface of the display panel 100, and improve the texture of the display screen.
  • the bonding layer 60 may be a common optical glue or may be a negative Poisson's ratio optical glue with a Poisson's ratio less than 1 like the bonding layer 60 in Embodiment 1.
  • the buffer layer 70 is disposed on a surface of the flexible substrate layer 10 away from the display layer 20, and is used to buffer and protect the structure of the display panel 100.
  • the buffer layer 70 has a material with a negative Poisson's ratio, for example, a urethane foam material with a Poisson's ratio less than 0.1, and the urethane foam material contains white carbon black particles.
  • the urethane foam material with a Poisson's ratio less than 0.1 has excellent toughness, and its toughness is not easy to cause fatigue, which helps to reduce the bending angles and wrinkles generated after bending, and makes the display panel 100 flatter.
  • the buffer layer 70 can generate a stress opposite to the impact direction due to the Poisson's ratio and resist part of the impact force, thereby improving the impact resistance and bending resistance of the display panel 100.
  • the buffer layer 70 in the embodiment of the invention has a higher mass energy absorption rate, and therefore has a higher energy absorption efficiency and a stronger damping characteristic.
  • the embodiment of the present invention also provides a method for manufacturing the above-mentioned display panel 100, which has the following manufacturing steps:
  • Step S10) Provide a flexible substrate layer 10:
  • the flexible substrate layer 10 is a polyimide layer, which is prepared by methods such as deposition and coating.
  • foam material isocyanate
  • white material polyether polyol or polyester polyol
  • white carbon black particles water, catalyst, blowing agent and other additives
  • the foam material is subjected to low-pressure compression treatment under the condition that the pressure is less than 21 MPa. Then the pressure is locked, the foam material is heated, and it is allowed to stand for 1-2 hours under the condition that the temperature is greater than 25°C and less than 1°C. After the standing, the foam material is taken out and cooled to room temperature to form a polyurethane foam material.
  • the polyurethane foam material is coated on a surface of the flexible substrate layer 10 and cured to form the buffer layer 70.
  • Step S30 A display layer 20, a touch layer 30, a polarizer 40 and a cover plate 50 are sequentially formed on the flexible substrate layer 10:
  • the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50 are prepared in advance.
  • a layer of adhesive material is coated on the flexible substrate layer 10, the display layer 20 is pasted on the adhesive, and the adhesive material is cured by ultraviolet light irradiation to form the adhesive mixture.
  • the touch layer 30, the polarizer 40, and the cover plate 50 are sequentially attached to the display layer 20 with an adhesive to form the display panel 100.
  • the buffer layer 70 is prepared by using a material with a Poisson's ratio less than 0.1, so that the buffer layer 70 has excellent toughness, and its toughness is not easy to cause fatigue, which helps to reduce the bending angles and wrinkles generated after bending.
  • the display panel 100 is flatter.
  • the buffer layer 70 can generate a stress opposite to the impact direction due to the Poisson's ratio and resist part of the impact force, thereby improving the impact resistance and bending resistance of the display panel 100.
  • the buffer layer 70 in the embodiment of the invention has a higher mass energy absorption rate, and therefore has a higher energy absorption efficiency and a stronger damping characteristic.
  • An embodiment of the present invention provides a display panel 100.
  • the display panel 100 includes a flexible substrate layer 10, a display layer 20, a touch layer 30, a polarizer 40, and a cover plate. 50.
  • the display panel 100 has a bending direction 101, and the bending direction 101 faces the flexible substrate layer 10.
  • the flexible substrate layer 10 is a polyimide (PI) layer, which ensures that the display panel 100 has a bendable and flexible feature.
  • PI polyimide
  • the display layer 20 is arranged on the flexible substrate layer 10, which is composed of a number of OLEDs (Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • OLEDs Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • the display panel 100 realizes the display of color images through the display layer 20.
  • the touch layer 30 is disposed on a surface of the display layer 20 away from the flexible substrate layer 10.
  • the touch layer 30 has a number of traces and pressure sensors, which are used to sense pressure changes received by the display panel 100 to generate touch signals to realize touch control.
  • the polarizer 40 is disposed on a surface of the touch layer 30 away from the display layer 20.
  • the polarizer 40 is used for subjecting the light emitted by the organic electroluminescent layer to polarization processing, so as to generate a contrast between light and darkness, and realize the display of the picture.
  • the cover plate 50 is a glass substrate, which is disposed on a surface of the polarizer 40 away from the touch layer 30.
  • the cover plate 50 is used to protect the overall structure of the display panel 100, while achieving flexible bending, it can also improve the flatness and impact resistance of the surface of the display panel 100, and improve the texture of the display screen.
  • the display panel 100 also has a first protection layer 80 and a second protection layer 90.
  • the first protection layer 80 is disposed on a surface of the flexible substrate layer 10 away from the display layer 20.
  • the area of the first protective layer 80 is larger than the area of any one of the flexible substrate layer 10, the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50, and the above-mentioned film layer is on the first protective layer 80
  • the orthographic projection on is located at the center of the first protective layer 80.
  • the first protective layer 80 has a negative Poisson's ratio material with a Poisson's ratio less than 0.1, such as the polyurethane foam material used in Example 2 or a negative Poisson's ratio rubber material.
  • the second protective layer 90 is provided on a surface of the cover plate 50 away from the polarizer 40, and there is a bonding layer 60 between the second protective layer 90 and the cover plate 50 for adding a second The adhesive force between the protective layer 90 and the cover plate 50.
  • the area of the second protective layer 90 is also larger than the area of any one of the flexible substrate layer 10, the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50, and the above-mentioned film layer is on the second protective layer.
  • the orthographic projection on 90 is also located at the center of the first protective layer 80.
  • the second protective layer 90 has a positive Poisson's ratio material with a positive Poisson's ratio. Further, a material with a Poisson's ratio greater than 0.1 can be selected.
  • the first protective layer 80 and the second protective layer 90 extend beyond the edge portions of the other film layers of the display panel 100 An internal buckle effect will be generated to protect the film layer between the first protective layer 80 and the second protective layer, and prevent peeling of the edge of the panel.
  • the first protective layer 80 and the second protective layer 90 are respectively located on the top surface and the bottom surface of the display panel 100.
  • the first protective layer 80 and the second protective layer 90 The protective layer 90 may also be located between two adjacent film layers in the layered structure of the display panel 100, and the number of film layers between the first protective layer 80 and the second protective layer 90 is not limited.
  • the first protective layer 80 is provided between the display layer 20 and the flexible substrate layer 10
  • the second protective layer 90 is provided between the touch layer 30 and the display layer 20.
  • An embodiment of the present invention provides a display panel 100.
  • the display panel 100 includes a flexible substrate layer 10, a display layer 20, a touch layer 30, a polarizer 40, and a cover plate. 50.
  • the display panel 100 has a bending direction 101, and the bending direction 101 faces the cover 50.
  • the flexible substrate layer 10 is a polyimide (PI) layer, which ensures that the display panel 100 has a bendable and flexible feature.
  • PI polyimide
  • the display layer 20 is arranged on the flexible substrate layer 10, which is composed of a number of OLEDs (Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • OLEDs Organic Light-Emitting Diode (Organic Light-Emitting Diode) display device array is formed, which has self-luminous characteristics.
  • the display panel 100 realizes the display of color images through the display layer 20.
  • the touch layer 30 is disposed on a surface of the display layer 20 away from the flexible substrate layer 10.
  • the touch layer 30 has a number of traces and pressure sensors, which are used to sense pressure changes received by the display panel 100 to generate touch signals to realize touch control.
  • the polarizer 40 is disposed on a surface of the touch layer 30 away from the display layer 20.
  • the polarizer 40 is used for subjecting the light emitted by the organic electroluminescent layer to polarization processing, so as to generate a contrast between light and darkness, and realize the display of the picture.
  • the cover plate 50 is a glass substrate, which is disposed on a surface of the polarizer 40 away from the touch layer 30.
  • the cover plate 50 is used to protect the overall structure of the display panel 100, while achieving flexible bending, it can also improve the flatness and impact resistance of the surface of the display panel 100, and improve the texture of the display screen.
  • the display panel 100 also has a first protection layer 80 and a second protection layer 90.
  • the first protective layer 80 is disposed on a surface of the cover plate 50 away from the polarizer 40.
  • the area of the first protective layer 80 is larger than the area of any one of the flexible substrate layer 10, the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50, and the above-mentioned film layer is on the first protective layer 80
  • the orthographic projection on is located at the center of the first protective layer 80.
  • the first protective layer 80 has a negative Poisson's ratio material with a Poisson's ratio less than 0.1, such as the polyurethane foam material used in Example 2 or a negative Poisson's ratio rubber material.
  • the second protective layer 90 is provided on a surface of the flexible substrate layer 10 away from the display layer 20. There is also a bonding layer 60 between the second protective layer 90 and the flexible substrate layer 10 for increasing The adhesion between the second protective layer 90 and the flexible substrate layer 10.
  • the area of the second protective layer 90 is also larger than the area of any one of the flexible substrate layer 10, the display layer 20, the touch layer 30, the polarizer 40 and the cover plate 50, and the above-mentioned film layer is on the second protective layer.
  • the orthographic projection on 90 is also located at the center of the first protective layer 80.
  • the second protective layer 90 has a positive Poisson's ratio material with a positive Poisson's ratio. Further, a material with a Poisson's ratio greater than 0.1 can be selected.
  • the first protective layer 80 and the second protective layer 90 extend beyond the edge portions of the other film layers of the display panel 100 An internal buckle effect will be generated to protect the film layer between the first protective layer 80 and the second protective layer, and prevent peeling of the edge of the panel.
  • the first protective layer 80 and the second protective layer 90 are respectively located on the top surface and the bottom surface of the display panel 100.
  • the first protective layer 80 and the second protective layer 90 The protective layer 90 may also be located between two adjacent film layers in the layered structure of the display panel 100, and the number of film layers between the first protective layer 80 and the second protective layer 90 is not limited. There may be a one-layer film structure or a multi-layer film structure.
  • the first protective layer 80 is provided between the cover plate 50 and the polarizer 40
  • the second protective layer 90 is provided between the touch layer 30 and the display layer 20.
  • the two-layer structure of the polarizer 40 and the touch layer 30 between the first protective layer 80 and the second protective layer 90, when the panel is bent, the internal buttoning effect of the first protective layer 80 and the second protective layer 90 will be
  • the principle and other layered structures of protecting the polarizer 40 and the touch layer 30 are the same as those in the fourth embodiment of the present invention, so they will not be repeated here. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

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Abstract

本发明提供了一种显示面板及其制备方法。所述显示面板包括缓冲层和/或至少一层贴合层。所述缓冲层设于所述显示面板的底部，所述贴合层设于所述显示面板层状结构中相邻的两层之间。其中，所述缓冲层和所述贴合层中具有泊松比小于0.1的材料。

Description

显示面板其制备方法 技术领域
本发明涉及显示器件领域，特别是一种显示面板其制备方法。
 背景技术
OLED（OrganicLight-Emitting Diode，有机电致发光显示）显示技术具有功耗低、可折叠、轻薄等优势，可适用于全面屏、瀑布屏、折叠屏等应用场景，是当下及未来显示的一种重要显示技术，应用前景广泛。
在OLED显示面板中，各显示功能层通过OCA（光学胶）胶层贴合在一起，OCA胶层在叠构中的比重较高，在维护模组结构弯折过程中的稳定性、回复性及弯折寿命方面起到至关重要的作用，是防止各功能层剥离的关键结构功能层。但是目前的模组结构在弯折过程中，OCA胶层失效（各显示功能层间的剥离；peeling）是限制弯折显示屏应用的主要阻碍之一。同时由于反复的折叠，在显示屏表面留下了永久折痕，限制了产品的使用寿命及用户体验。
 技术问题
本发明的目的是提供一种显示面板其制备方法，以解决现有技术中柔性模组叠构剥离脱落、恢复性不足等问题。
 技术解决方案
为实现上述目的，本发明提供一种显示面板，所述显示面板包括柔性衬底层、显示层、触控层、偏光片、盖板、缓冲层和/或至少一层贴合层。
所述显示层设于所述柔性衬底层上。所述触控层设于所述显示层远离所述柔性衬底层的一表面上。所述偏光片设于所述触控层远离所述显示层的一表面上。所述盖板设于所述偏光片远离所述触控层的一表面上。所述缓冲层设于所述柔性衬底层远离所述显示层的一表面上，所述缓冲层中具有泊松比小于0.1的材料。和/或所述层贴合层设于所述显示面板层状结构中相邻的两层之间，所述贴合层中具有泊松比小于0.1的材料。
进一步地，所述缓冲层的材料中包含聚氨酯泡棉材料、白炭黑颗粒。
进一步地，所述贴合层的材料中包含聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶中的至少一种。其中，所述聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶的化学基团的侧基中具有液晶分子。
进一步地，所述显示面板具有一弯折方向，所述弯折方向朝向所述柔性衬底层或朝向所述盖板。
所述显示面板还包括第一保护层和第二保护层。
所述第一保护层。设于所述显示面板层状结构中相邻的两层之间或设于所述柔性衬底层远离所述显示层的一侧或设于所述盖板远离所述偏光片的一侧。所述第二保护层设于所述显示面板层状结构中相邻的两层之间或设于所述柔性衬底层远离所述显示层的一侧或设于所述盖板远离所述偏光片的一侧。所述柔性衬底层、所述显示层、所述触控层、所述偏光片以及所述盖板中至少一层位于所述第一保护层和所述第二保护层之间。
其中，所述第一保护层中具有泊松比小于0.1的材料，所述第二保护层中具有泊松比为正数的材料。所述柔性衬底层、所述显示层、所述触控层、所述偏光片以及所述盖板的面积均小于所述第一保护层或第二保护层的面积。
进一步地，当所述弯折方向朝向所述柔性衬底层时，所述第一保护层设于所述显示面板中靠近所述柔性衬底层的一侧，所述第二保护层设于所述显示面板中靠近所述盖板的一侧。当所述弯折方向朝向所述盖板时，所述第一保护层设于所述显示面板中靠近所述盖板的一侧，所述第二保护层设于所述显示面板中靠近所述柔性衬底层中的一侧。
本发明实施例中还提供一种显示面板的制备方法，其包括以下步骤：
提供一柔性衬底层。在所述柔性衬底层上依次形成显示层、触控层、偏光片以及盖板。在柔性衬底层远离所述显示层的一表面上形成缓冲层，和/或在所述显示面板层状结构中相邻的两层之间形成贴合层。
其中，所述缓冲层和所述贴合层中具有泊松比小于0.1的材料。
进一步地，所述缓冲层的材料中包含聚氨酯泡棉材料、白炭黑颗粒。
进一步地，在柔性衬底层远离所述显示层的一表面上形成缓冲层步骤中包括以下步骤：
加入发泡材料通过一步发泡工艺形成泡沫材料，所述发泡材料中包含白炭黑颗粒。将所述泡沫材料在压力小于21兆帕的条件下进行压缩处理。锁定压力后，将所述泡沫材料在温度大于25℃并小于140℃的条件下静置1-2小时。静置结束后取出所述泡沫材料并降温至室温，形成聚氨酯泡棉材料。
进一步地，所述贴合层的材料中包含聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶中的至少一种。其中，所述聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶的化学基团的侧基中具有液晶分子。
进一步地，在所述显示面板层状结构中相邻的两层之间形成贴合层步骤中包括以下步骤：
在第一化合物中加入小分子液晶，充分反应后得到醇酯化产物。将所述醇酯化产物与第二化合物混合，得到聚合单体混合物。在所述聚合单体混合物中加入偶氮引发剂引发自由基均相聚合，得到改性的第一化合物。通过高分子单向拉伸取向工艺处理所述改性的第一化合物，得到侧基中具有液晶分子的光学胶。
其中，所述第一化合物可以为聚氨酯、丙烯酸酯、橡胶中的一种。所述第二化合物为醇类酯化产物。
 有益效果
本发明的优点是：本发明的一种显示面板及其制备方法，通过使用泊松比小于0.1的负泊松比材料延长显示面板的使用寿命，利用负泊松比的材料特性提高膜层的抗冲击性，提高膜层的韧性，从而提高显示面板的稳定性。
 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使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例1中显示面板的层状结构示意图；
图2为本发明实施例2中显示面板的层状结构示意图；
图3为本发明实施例3中显示面板的层状结构示意图；
图4为本发明实施例4中显示面板的层状结构示意图；
图5为本发明实施例3或4中第一保护层的弯折示意图；
图6为本发明实施例3或4中第二保护层的弯折示意图。
图中部件表示如下：
显示面板100；弯折方向101；
柔性衬底层10；显示层20；
触控层30；偏光片40；
盖板50；粘合层60；
缓冲层70；第一保护层80；
第二保护层90。
 本发明的实施方式
以下参考说明书附图介绍本发明的优选实施例，证明本发明可以实施，所述发明实施例可以向本领域中的技术人员完整介绍本发明，使其技术内容更加清楚和便于理解。本发明可以通过许多不同形式的发明实施例来得以体现，本发明的保护范围并非仅限于文中提到的实施例。
在附图中，结构相同的部件以相同数字标号表示，各处结构或功能相似的组件以相似数字标号表示。附图所示的每一部件的尺寸和厚度是任意示出的，本发明并没有限定每个组件的尺寸和厚度。为了使图示更清晰，附图中有些地方适当夸大了部件的厚度。
此外，以下各发明实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定发明实施例。本发明中所提到的方向用语，例如，“上”、“下”、“前”、“后”、“左”、“右”、“内”、“外”、“侧面”等，仅是参考附加图式的方向，因此，使用的方向用语是为了更好、更清楚地说明及理解本发明，而不是指示或暗指所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
当某些部件被描述为“在”另一部件“上”时，所述部件可以直接置于所述另一部件上；也可以存在一中间部件，所述部件置于所述中间部件上，且所述中间部件置于另一部件上。当一个部件被描述为“安装至”或“连接至”另一部件时，二者可以理解为直接“安装”或“连接”，或者一个部件通过一中间部件间接“安装至”、或“连接至”另一个部件。
实施例1
本发明实施例中提供了一种显示面板100，如图1所述，所述显示面板100包括一柔性衬底层10、一显示层20、一触控层30、一偏光片40、一盖板50以及四层贴合层60。
所述柔性衬底层10为聚酰亚胺（PI）层，其保证所述显示面板100具有可弯折的柔性特征。
所述显示层20设于所述柔性衬底层10上，其由若干OLED（Organic Light-Emitting Diode, 有机发光二极管）显示器件阵列排布形成，其具有自发光特性。所述显示面板100通过所述显示层20实现彩色画面的显示。
所述触控层30设于所述显示层20远离所述柔性衬底层10的一表面上。所述触控层30中具有若干走线以及压力传感器，其用于感应显示面板100收到的压力变化，产生触控信号，实现触摸控制。
所述偏光片40设于所述触控层30远离所述显示层20的一表面上。所述偏光片40用于将所述有机电致发光层发出的光线经过偏振处理，从而产生明暗对比，实现画面的显示。
所述盖板50为玻璃基板，其设于所述偏光片40远离所述触控层30的一表面上。所述盖板50用于保护所述显示面板100的整体结构，在实现柔性弯折的同时还可以提高所述显示面板100的表面的平整性以及抗冲击性，提升显示屏的质感。
在本发明实施例中具有四层贴合层60，分别设于所述柔性衬底层10与所述显示层20之间、所述显示层20与所述触控层30之间、所述触控层30与所述偏光片40之间以及所述偏光片40与所述盖板50之间。所述贴合层60用于提高膜层与膜层之间的粘合力。
其中，所述贴合层60中采用了泊松比小于0.1的负泊松比光学胶。所述光学胶可以为聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶中的一种，并且所述聚氨酯系光学胶、所述丙烯酸系光学胶以及所述橡胶系光学胶化学基团侧基中具有液晶分子。在显示面板100在弯折时，泊松比小于0.1的光学胶受到挤压的弯折部分会出现反向流动，这种反向流动的应力能抵抗胶材在弯折过程中出现的流动现象，防止出现由于反复弯折而造成的贴合层60塑性形变的现象，进一步提高膜层与膜层之间的粘合力，避免发成分层脱落的现象。
本发明实施例中还提供了一种上述显示面板100的制备方法，其具有以下制备步骤：
步骤S10）提供一柔性衬底层10：所述柔性衬底层10中为聚酰亚胺层，其通过沉积、涂布等方法制备而成。
步骤S20）在所述柔性衬底层10上依次形成显示层20、触控层30、偏光片40以及盖板50：
预先制备好显示层20、触控层30、偏光片40以及盖板50。在所述柔性衬底层10上涂覆一层贴合层60材料，将所述显示层20贴覆在所述贴合层60上，通过紫外光照射使所述贴合层60材料固化，形成所述贴合层60。以此类推，将所述触控层30、偏光片40以及盖板50依次通过贴合层60贴合在显示层20上方，形成所述显示面板100。
其中，所述贴合层60采用了侧基中具有液晶分子的丙烯酸系光学胶，所述丙烯酸系光学胶的制备方法如下：
在第一化合物中加入小分子液晶，充分反应后得到醇酯化合物。将所述醇酯化合物与第二化合物混合，所述第二化合物为醇类酯化产物，例如聚丙烯酸甲酯，得到聚合单体混合物。然后，在所述聚合单体混合物中加入偶氮引发剂，通过偶氮引发剂引发自由基均相聚合，得到侧基携带有液晶分子的改性的第一化合物。
随后，将改性的第一化合物通过高分子单向拉伸处理进行取向，拉伸方向为负泊松比方向，提升分子取向度，最终得到侧基中具有液晶分子的丙烯酸系光学胶。
这种侧基中具有液晶分子的丙烯酸系光学胶在受到外力作用时，柔性主链趋于伸展，而刚性侧基与主链刚性连接，随主链伸展而张开，分子链自由体积提升，从而获得了一定的负泊松比效果，进而提升所述贴合层60的性能，增加其粘合力以及减少其流动性。
在本发明实施例中所采用的第一化合物为丙烯酸酯，在本发明的其他实施例中还可以采用聚氨酯、橡胶等材料，用以制备聚氨酯系光学胶或橡胶系光学胶，其制备方法与本发明实施例中的相似，故不在此做过多赘述。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其它实施例，都属于本申请保护的范围。
本发明实施例中通过使用泊松比小于0.1的材料进行膜层之间的贴合，此种材料在受到弯折挤压时会会出现反向流动，这种反向流动产生的应力能抵抗胶材在弯折过程中出现的流动现象，防止出现贴合层60发生形变，进而也避免了由于形变二导致的贴合层60开裂等现象，进一步提高膜层与膜层之间的粘合力，避免发成分层脱落的现象，提高显示面板100的稳定性。
实施例2
本发明实施例中提供了一种显示面板100，如图2所述，所述显示面板100包括一柔性衬底层10、一显示层20、一触控层30、一偏光片40、一盖板50以及一缓冲层70。
所述柔性衬底层10为聚酰亚胺（PI）层，其保证所述显示面板100具有可弯折的柔性特征。
所述显示层20设于所述柔性衬底层10上，其由若干OLED（Organic Light-Emitting Diode, 有机发光二极管）显示器件阵列排布形成，其具有自发光特性。所述显示面板100通过所述显示层20实现彩色画面的显示。
所述触控层30设于所述显示层20远离所述柔性衬底层10的一表面上。所述触控层30中具有若干走线以及压力传感器，其用于感应显示面板100收到的压力变化，产生触控信号，实现触摸控制。
所述偏光片40设于所述触控层30远离所述显示层20的一表面上。所述偏光片40用于将所述有机电致发光层发出的光线经过偏振处理，从而产生明暗对比，实现画面的显示。
所述盖板50为玻璃基板，其设于所述偏光片40远离所述触控层30的一表面上。所述盖板50用于保护所述显示面板100的整体结构，在实现柔性弯折的同时还可以提高所述显示面板100的表面的平整性以及抗冲击性，提升显示屏的质感。
在所述柔性衬底层10与所述显示层20之间、所述显示层20与所述触控层30之间、所述触控层30与所述偏光片40之间以及所述偏光片40与所述盖板50之间均具有一层贴合层60，所述贴合层60用于提高膜层与膜层之间的粘合力。所述贴合层60可以为普通光学胶也可以与实施例1中的贴合层60一样采用泊松比小于1的负泊松比光学胶。
所述缓冲层70设于所述柔性衬底层10远离所述显示层20的一表面上，其用于缓冲保护所述显示面板100的结构。所述缓冲层70中具有负泊松比材料，例如泊松比小于0.1的氨酯泡棉材料，所述氨酯泡棉材料中包含白炭黑颗粒。泊松比小于0.1的氨酯泡棉材料具有优异的韧性，并且其韧性不易产生疲劳，有助于减少弯折后产生的弯折角和褶皱，使显示面板100更加平整。在显示面板100受到冲击时，所述缓冲层70由于泊松比相应可以产生与冲击方向相反的应力，抵抗部分冲击力，从而提高显示面板100的抗冲击性和抗弯折性，并且，本发明实施例中的缓冲层70质量能量吸收率更高，因而具有较高的能量吸收效率，具有较强的阻尼特性。
本发明实施例中还提供了一种上述显示面板100的制备方法，其具有以下制备步骤：
步骤S10）提供一柔性衬底层10：所述柔性衬底层10中为聚酰亚胺层，其通过沉积、涂布等方法制备而成。
步骤S20）柔性衬底层10远离所述显示层20的一表面上形成缓冲层70：
将黑料（异氰酸酯）、白料（聚醚多元醇或聚酯多元醇）、白炭黑颗粒、水、催化剂、发泡剂等添加剂混合，并通过一步发泡工艺形成泡沫材料。将所述泡沫材料在压力小于21兆帕的条件下进行低压压缩处理。然后锁定压力，将所述泡沫材料进行升温，在温度大于25℃并小于1℃的条件下静置1-2小时。静置结束后取出所述泡沫材料并降温至室温，形成聚氨酯泡棉材料。
将所述聚氨酯泡棉材料涂覆在所述柔性衬底层10的一表面上，固化形成所述缓冲层70。
步骤S30）在所述柔性衬底层10上依次形成显示层20、触控层30、偏光片40以及盖板50：
预先制备好显示层20、触控层30、偏光片40以及盖板50。在所述柔性衬底层10上涂覆一层粘合剂材料，将所述显示层20贴覆在所述粘合剂上，通过紫外光照射使所述粘合剂材料固化，形成所述粘合剂。以此类推，将所述触控层30、偏光片40以及盖板50依次通过粘合剂贴合在显示层20上方，形成所述显示面板100。
本发明实施例中通过使用泊松比小于0.1的材料制备缓冲层70，使缓冲层70具有优异的韧性，并且其韧性不易产生疲劳，有助于减少弯折后产生的弯折角和褶皱，使显示面板100更加平整。在显示面板100受到冲击时，所述缓冲层70由于泊松比相应可以产生与冲击方向相反的应力，抵抗部分冲击力，从而提高显示面板100的抗冲击性和抗弯折性，并且，本发明实施例中的缓冲层70质量能量吸收率更高，因而具有较高的能量吸收效率，具有较强的阻尼特性。
实施例3
本发明实施例中提供了一种显示面板100，如图3所述，所述显示面板100包括一柔性衬底层10、一显示层20、一触控层30、一偏光片40以及一盖板50。所述显示面板100具有一弯折方向101，所述弯折方向101朝向所述柔性衬底层10。
所述柔性衬底层10为聚酰亚胺（PI）层，其保证所述显示面板100具有可弯折的柔性特征。
所述显示层20设于所述柔性衬底层10上，其由若干OLED（Organic Light-Emitting Diode, 有机发光二极管）显示器件阵列排布形成，其具有自发光特性。所述显示面板100通过所述显示层20实现彩色画面的显示。
所述触控层30设于所述显示层20远离所述柔性衬底层10的一表面上。所述触控层30中具有若干走线以及压力传感器，其用于感应显示面板100收到的压力变化，产生触控信号，实现触摸控制。
所述偏光片40设于所述触控层30远离所述显示层20的一表面上。所述偏光片40用于将所述有机电致发光层发出的光线经过偏振处理，从而产生明暗对比，实现画面的显示。
所述盖板50为玻璃基板，其设于所述偏光片40远离所述触控层30的一表面上。所述盖板50用于保护所述显示面板100的整体结构，在实现柔性弯折的同时还可以提高所述显示面板100的表面的平整性以及抗冲击性，提升显示屏的质感。
在所述柔性衬底层10与所述显示层20之间、所述显示层20与所述触控层30之间、所述触控层30与所述偏光片40之间以及所述偏光片40与所述盖板50之间均具有一层贴合层60，所述贴合层60用于提高膜层与膜层之间的粘合力。
所述显示面板100中还具有一第一保护层80以及一第二保护层90。
所述第一保护层80设于所述柔性衬底层10远离所述显示层20的一表面上。所述第一保护层80的面积大于柔性衬底层10、显示层20、触控层30、偏光片40以及盖板50中任意一层的面积，并且上述膜层在所述第一保护层80上的正投影位于所述第一保护层80的中心位置。所述第一保护层80中具有泊松比小于0.1的负泊松比材料，例如实施例2中所采用的聚氨酯泡棉材料或负泊松比的橡胶材料。
所述第二保护层90设于所述盖板50远离所述偏光片40的一表面上，在第二保护层90与盖板50之间还具有一贴合层60，用于增加第二保护层90与盖板50之间的粘合力。所述第二保护层90的面积也大于柔性衬底层10、显示层20、触控层30、偏光片40以及盖板50中任意一层的面积，并且上述膜层在所述第二保护层90上的正投影也位于所述第一保护层80的中心位置。所述第二保护层90中具有泊松比为正数的正泊松比材料，进一步地可以选用泊松比大于0.1的材料。
如图5所示，所述第一保护层80由于其所采用的负泊松比材料的材料特性，在受到弯折压迫时会产生与弯折方向101相反的应力。而所述第二保护层90则如图6所示，由于其所采用的正泊松比材料的材料特性，受到弯折压迫时则会产生与弯折方向101相同的应力。因此，通过第一保护层80和第二保护层90的配合，当显示面板100弯折时，所述第一保护层80和所述第二保护层90超出显示面板100其他膜层的边缘部分就会产生内扣效应，保护第一保护层80与第二保护之间的膜层，防止面板边缘发生剥离。
在本发明实施例中，第一保护层80和第二保护层90分别位于显示面板100的顶面和底面，在本发明的其他实施例中，所述第一保护层80和所述第二保护层90还可以位于显示面板100的层状结构中相邻的两层膜层之间，所述第一保护层80和所述第二保护层90之间的膜层数量并不受限，可以有一层膜层结构或多层膜层结构，例如：第一保护层80设于显示层20与柔性衬底层10之间，第二保护层90设于触控层30与显示层20之间，第一保护层80和第二保护层90之间仅具有显示层20一层，在面板弯折时，第一保护层80和第二保护层90的内扣效应就会保护所述显示层20，其原理以及其他层状结构与本发明实施例3中的相同，因此不在此做过多赘述。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其它实施例，都属于本申请保护的范围。
实施例4
本发明实施例中提供了一种显示面板100，如图4所述，所述显示面板100包括一柔性衬底层10、一显示层20、一触控层30、一偏光片40以及一盖板50。所述显示面板100具有一弯折方向101，所述弯折方向101朝向所述盖板50。
所述柔性衬底层10为聚酰亚胺（PI）层，其保证所述显示面板100具有可弯折的柔性特征。
所述显示层20设于所述柔性衬底层10上，其由若干OLED（Organic Light-Emitting Diode, 有机发光二极管）显示器件阵列排布形成，其具有自发光特性。所述显示面板100通过所述显示层20实现彩色画面的显示。
所述触控层30设于所述显示层20远离所述柔性衬底层10的一表面上。所述触控层30中具有若干走线以及压力传感器，其用于感应显示面板100收到的压力变化，产生触控信号，实现触摸控制。
所述偏光片40设于所述触控层30远离所述显示层20的一表面上。所述偏光片40用于将所述有机电致发光层发出的光线经过偏振处理，从而产生明暗对比，实现画面的显示。
所述盖板50为玻璃基板，其设于所述偏光片40远离所述触控层30的一表面上。所述盖板50用于保护所述显示面板100的整体结构，在实现柔性弯折的同时还可以提高所述显示面板100的表面的平整性以及抗冲击性，提升显示屏的质感。
在所述柔性衬底层10与所述显示层20之间、所述显示层20与所述触控层30之间、所述触控层30与所述偏光片40之间以及所述偏光片40与所述盖板50之间均具有一层贴合层60，所述贴合层60用于提高膜层与膜层之间的粘合力。
所述显示面板100中还具有一第一保护层80以及一第二保护层90。
所述第一保护层80设于所述盖板50远离所述偏光片40的一表面上。所述第一保护层80的面积大于柔性衬底层10、显示层20、触控层30、偏光片40以及盖板50中任意一层的面积，并且上述膜层在所述第一保护层80上的正投影位于所述第一保护层80的中心位置。所述第一保护层80中具有泊松比小于0.1的负泊松比材料，例如实施例2中所采用的聚氨酯泡棉材料或负泊松比的橡胶材料。
所述第二保护层90设于所述柔性衬底层10远离所述显示层20的一表面上，在第二保护层90与柔性衬底层10之间还具有一贴合层60，用于增加第二保护层90与柔性衬底层10之间的粘合力。所述第二保护层90的面积也大于柔性衬底层10、显示层20、触控层30、偏光片40以及盖板50中任意一层的面积，并且上述膜层在所述第二保护层90上的正投影也位于所述第一保护层80的中心位置。所述第二保护层90中具有泊松比为正数的正泊松比材料，进一步地可以选用泊松比大于0.1的材料。
如图5所示，所述第一保护层80由于其所采用的负泊松比材料的材料特性，在受到弯折压迫时会产生与弯折方向101相反的应力。而所述第二保护层90则如图6所示，由于其所采用的正泊松比材料的材料特性，受到弯折压迫时则会产生与弯折方向101相同的应力。因此，通过第一保护层80和第二保护层90的配合，当显示面板100弯折时，所述第一保护层80和所述第二保护层90超出显示面板100其他膜层的边缘部分就会产生内扣效应，保护第一保护层80与第二保护之间的膜层，防止面板边缘发生剥离。
在本发明实施例中，第一保护层80和第二保护层90分别位于显示面板100的顶面和底面，在本发明的其他实施例中，所述第一保护层80和所述第二保护层90还可以位于显示面板100的层状结构中相邻的两层膜层之间，所述第一保护层80和所述第二保护层90之间的膜层数量并不受限，可以有一层膜层结构或多层膜层结构，例如：第一保护层80设于盖板50与偏光片40之间，第二保护层90设于触控层30与显示层20之间，第一保护层80和第二保护层90之间偏光片40和触控层30两层膜层结构，在面板弯折时，第一保护层80和第二保护层90的内扣效应就会保护所述偏光片40和所述触控层30，其原理以及其他层状结构与本发明实施例4中的相同，因此不在此做过多赘述。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其它实施例，都属于本申请保护的范围。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。

Claims (10)

  1. 一种显示面板，其包括：
    柔性衬底层；
    显示层，设于所述柔性衬底层上；
    触控层，设于所述显示层远离所述柔性衬底层的一表面上；
    偏光片，设于所述触控层远离所述显示层的一表面上；
    盖板，设于所述偏光片远离所述触控层的一表面上；
    缓冲层，设于所述柔性衬底层远离所述显示层的一表面上，所述缓冲层中具有泊松比小于0.1的材料；和/或
    至少一层贴合层，设于所述显示面板层状结构中相邻的两层之间，所述贴合层中具有泊松比小于0.1的材料。
  2. 如权利要求1所述的显示面板，其中，所述缓冲层的材料中包含聚氨酯泡棉材料、白炭黑颗粒。
  3. 如权利要求1所述的显示面板，其中，所述贴合层的材料中包含聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶中的至少一种；其中，所述聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶的化学基团的侧基中具有液晶分子。
  4. 如权利要求1所述的显示面板，其中，所述显示面板具有一弯折方向，所述弯折方向朝向所述柔性衬底层或朝向所述盖板；
    所述显示面板还包括：
    第一保护层，设于所述显示面板层状结构中相邻的两层之间或设于所述柔性衬底层远离所述显示层的一侧或设于所述盖板远离所述偏光片的一侧；
    第二保护层，设于所述显示面板层状结构中相邻的两层之间或设于所述柔性衬底层远离所述显示层的一侧或设于所述盖板远离所述偏光片的一侧；
    所述柔性衬底层、所述显示层、所述触控层、所述偏光片以及所述盖板中至少一层位于所述第一保护层和所述第二保护层之间；
    其中，所述第一保护层中具有泊松比小于0.1的材料，所述第二保护层中具有泊松比为正数的材料；
    所述柔性衬底层、所述显示层、所述触控层、所述偏光片以及所述盖板的面积均小于所述第一保护层或第二保护层的面积。
  5. 如权利要求4所述的显示面板，其中，
    当所述弯折方向朝向所述柔性衬底层时，所述第一保护层设于所述显示面板中靠近所述柔性衬底层的一侧，所述第二保护层设于所述显示面板中靠近所述盖板的一侧；
    当所述弯折方向朝向所述盖板时，所述第一保护层设于所述显示面板中靠近所述盖板的一侧，所述第二保护层设于所述显示面板中靠近所述柔性衬底层中的一侧。
  6. 一种显示面板的制备方法，其包括以下步骤：
    提供一柔性衬底层；
    在所述柔性衬底层上依次形成显示层、触控层、偏光片以及盖板；
    在柔性衬底层远离所述显示层的一表面上形成缓冲层；和/或
    在所述显示面板层状结构中相邻的两层之间形成贴合层；
    其中，所述缓冲层和所述贴合层中具有泊松比小于0.1的材料。
  7. 如权利要求6所述的显示面板制备方法，其中，所述缓冲层的材料中包含聚氨酯泡棉材料、白炭黑颗粒。
  8. 如权利要求7所述的显示面板制备方法，其中，
    在柔性衬底层远离所述显示层的一表面上形成缓冲层步骤中包括以下步骤：
    加入发泡材料通过一步发泡工艺形成泡沫材料，所述发泡材料中包含白炭黑颗粒；
    将所述泡沫材料在压力小于21兆帕的条件下进行压缩处理；
    锁定压力后，将所述泡沫材料在温度大于25℃并小于140℃的条件下静置1-2小时；
    静置结束后取出所述泡沫材料并降温至室温，形成聚氨酯泡棉材料。
  9. 如权利要求6所述的显示面板制备方法，其中，所述贴合层的材料中包含聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶中的至少一种；其中，所述聚氨酯系光学胶、丙烯酸系光学胶以及橡胶系光学胶的化学基团的侧基中具有液晶分子。
  10.     如权利要求9所述的显示面板制备方法，其中，
    在所述显示面板层状结构中相邻的两层之间形成贴合层步骤中包括以下步骤：
    在第一化合物中加入小分子液晶，充分反应后得到醇酯化产物；
    将所述醇酯化产物与第二化合物混合，得到聚合单体混合物；
    在所述聚合单体混合物中加入偶氮引发剂引发自由基均相聚合，得到改性的第一化合物；
    通过高分子单向拉伸取向工艺处理所述改性的第一化合物，得到侧基中具有液晶分子的光学胶；
    其中，所述第一化合物可以为聚氨酯、丙烯酸酯、橡胶中的一种；所述第二化合物为醇类酯化产物。
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