WO2018153035A1 - 柔性显示面板及其制备方法、显示装置 - Google Patents

柔性显示面板及其制备方法、显示装置 Download PDF

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Publication number
WO2018153035A1
WO2018153035A1 PCT/CN2017/097064 CN2017097064W WO2018153035A1 WO 2018153035 A1 WO2018153035 A1 WO 2018153035A1 CN 2017097064 W CN2017097064 W CN 2017097064W WO 2018153035 A1 WO2018153035 A1 WO 2018153035A1
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Prior art keywords
flexible display
layer
display panel
flexible
display screen
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PCT/CN2017/097064
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English (en)
French (fr)
Inventor
李钊
蔡宝鸣
史世明
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京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to BR112018007642-2A priority Critical patent/BR112018007642B1/pt
Priority to EP17851943.5A priority patent/EP3588566A4/en
Priority to JP2018516743A priority patent/JP7048488B2/ja
Priority to US15/764,580 priority patent/US11127319B2/en
Priority to KR1020187010682A priority patent/KR102170023B1/ko
Priority to MX2018004694A priority patent/MX2018004694A/es
Priority to RU2018114022A priority patent/RU2721102C1/ru
Priority to AU2017333829A priority patent/AU2017333829B2/en
Publication of WO2018153035A1 publication Critical patent/WO2018153035A1/zh
Priority to US17/405,873 priority patent/US20210376270A1/en

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    • 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
    • H10K59/88—Dummy elements, i.e. elements having non-functional features
    • 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
    • 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
    • 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
    • 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
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • H10K50/868—Arrangements for polarized light emission
    • 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
    • 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
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—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
    • 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
    • H10K2102/00—Constructional details relating to 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
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • Embodiments of the present disclosure relate to a flexible display panel, a method of fabricating the same, and a display device.
  • the flexible display device can display information normally when the flexible display device is folded or bent by forming the display device on the flexible substrate.
  • the flexible display device has broad application prospects in the field of portable electronic devices and the like.
  • an organic electroluminescence display device in a flexible display device mainly includes an organic light-emitting layer composed of an organic light-emitting material, a cathode layer, an anode layer, and a functional layer, and an appropriate voltage is applied between the cathode layer and the anode layer,
  • the OLED device is self-illuminating, and the OLED device does not require a backlight (Back-lighting), so that the OLED device has a light and thin color, so that the electrons of the hole and the cathode of the anode pass through the functional layer and are electroluminescent in the organic light-emitting layer.
  • the OLED device is also characterized by its portability and flexibility.
  • At least one embodiment of the present disclosure provides a flexible display panel including: a flexible substrate; a flexible display screen on the flexible substrate; a protective film on a side of the flexible display screen away from the flexible substrate; and a connection layer Between the flexible display screen and the protective film, the connecting layer comprises at least one layer of superelastic film.
  • connection layer is in direct contact with the flexible display screen and the protective film.
  • the material of the superelastic film layer includes ethylene propylene rubber, ethylene-butadiene-styrene block copolymer, and styrene-butadiene-benzene. At least one of the ethylene block copolymers.
  • connection layer further includes a first adhesive layer and a second adhesive layer, the superelastic film layer being sandwiched between the first adhesive layer and the Between the second adhesive layers.
  • the materials of the first adhesive layer and the second adhesive layer include optical glue.
  • the material of the protective film includes polyimide, silicon nitride, silicon oxide or silicon oxynitride.
  • the flexible display panel provided by at least one embodiment of the present disclosure further includes a flexible support layer, wherein the flexible support layer is disposed on a side of the flexible substrate remote from the flexible display screen.
  • the flexible display panel provided by at least one embodiment of the present disclosure further includes a circular polarizer, wherein the circular polarizer is disposed on a side of the flexible display screen away from the flexible substrate.
  • the material of the flexible support layer comprises polyethylene terephthalate or polyvinyl fluoride.
  • the circular polarizer includes a line polarizer and a 1/4 wavelength optical retarder which are stacked.
  • the flexible display panel provided by at least one embodiment of the present disclosure further includes a touch screen, wherein the touch screen is disposed on a side of the flexible display screen adjacent to the protective film.
  • At least one embodiment of the present disclosure also provides a flexible display device including any of the above flexible display panels.
  • At least one embodiment of the present disclosure further provides a method for fabricating a flexible display panel, comprising: providing a flexible substrate; forming a flexible display screen on the flexible substrate; forming a side of the flexible display screen away from the flexible substrate a connecting layer; a protective film is formed on a side of the connecting layer facing away from the flexible display screen, wherein the connecting layer comprises a superelastic film layer.
  • the material of the superelastic film layer includes ethylene propylene rubber, ethylene-butadiene-styrene block copolymer, and styrene-butadiene-styrene block. At least one of the copolymers.
  • the method before the forming the superelastic film layer, the method further comprises forming a first adhesive layer, and further comprising forming the second adhesive layer after forming the superelastic film layer.
  • 1 is a schematic structural view of a flexible display panel
  • FIG. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a connection layer according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a flexible display panel according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic structural view of the flexible display panel of FIG. 4 after being bent;
  • FIG. 6 is a schematic structural diagram of a flexible display panel according to another embodiment of the present disclosure.
  • FIG. 7 is a schematic structural view of the flexible display panel of FIG. 6 after being bent;
  • FIG. 8 is a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure.
  • FIG. 9 is a flowchart of a method for fabricating a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural view of a flexible display panel.
  • the flexible display panel includes a back plate 101 , a display element 102 , a touch element 103 , a circular polarizer 104 , and a protective film 106 , and a circular polarizer .
  • OCA optical clear adhesive Since the circular polarizer 104 which plays the anti-reflection effect is thick, in the structure shown in FIG. 1, the stress neutral layer is located in the circular polarizer 104, and the stress neutral layer is far from the display panel and the touch panel, so that When the flexible display panel shown in FIG. 1 is bent, the required bending force is large, the damage to the display element 102 and the touch element 103 is large, and after the flexible display panel is bent, The ability to recover from deformation is also poor.
  • OCA optical clear adhesive
  • the outer layer is subjected to the tensile force
  • the inner layer is subjected to the pressing force
  • a transition layer which is neither subjected to the tensile force nor the pressing force necessarily exists in the cross section thereof.
  • the stress of the transition layer is almost zero, and the transition layer is the stress neutral layer of the material. That is, the stress neutral layer refers to a surface formed at all positions where the internal tangential stress is zero when the material is bent and deformed.
  • the length of the stress-neutral layer during the bending process remains the same as before the bending, and the stress-neutral layer is the basis for calculating the unfolding length of the bending member.
  • an embodiment of the present disclosure discloses a flexible display panel including: a flexible substrate; a flexible display screen on the flexible substrate; a protective film on a side of the flexible display screen away from the flexible substrate; and a clip A connecting layer between the flexible display screen and the protective film, the connecting layer comprising at least one layer of superelastic film.
  • the position of the stress neutral layer in the flexible display panel can be changed by the superelastic film layer disposed in the flexible display panel, thereby reducing damage to the flexible display screen during bending of the flexible display panel, except
  • the superelastic film layer can also reduce the bending force required for bending the flexible display panel, and improve the ability of the flexible display panel to return to deformation after being bent.
  • FIG. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present disclosure.
  • the flexible display panel 200 includes a flexible substrate 2011, a flexible display screen 2012 disposed on the flexible substrate 2011, a protective film 203 disposed on a side of the flexible display screen 201 remote from the flexible substrate 2011, and sandwiched between
  • the connection layer 202 between the flexible display screen 2012 and the protective film 203 includes a superelastic film layer 2021.
  • “superelasticity” means that a large deformation occurs when a force is applied, and a property of recovery occurs when the force is released.
  • the deformation of the usual elastic material below 0.5% can no longer be restored.
  • a material capable of substantially completely recovering deformation of 1.0% or more is referred to as a "superelastic" material.
  • “completely” means a state in which the material deformed by 1.0% or more can be restored to a state before deformation. Further, the deformation of the material of 1.0% or more can be substantially recovered by 98%, and further, the material 1.0 can be included. A deformation of more than % can be substantially recovered by 95%, and further, a deformation of 1.0% or more of the material can be substantially recovered by 90%.
  • connection layer 202 is in direct contact with the flexible display screen 2012 and the protective film 203.
  • connection layer 202 may not be in direct contact with the flexible display screen 2012 and the protective film 203, and may include other film layers in the middle, and the specific film layer is set by a person skilled in the art according to actual needs.
  • the material of the superelastic film layer includes at least one of ethylene propylene rubber, ethylene-butadiene-styrene block copolymer, and styrene-butadiene-styrene block copolymer, for example, the super
  • the material of the elastic film layer may be any one of ethylene propylene rubber, ethylene-butadiene-styrene block copolymer and styrene-butadiene-styrene block copolymer, or may be ethylene propylene rubber.
  • ethylene-butadiene-styrene block copolymer and styrene-butadiene-styrene block copolymer which may also be ethylene propylene rubber, ethylene-butadiene-styrene
  • a mixture of a block copolymer and a styrene-butadiene-styrene block copolymer may also be ethylene propylene rubber, ethylene-butadiene-styrene A mixture of a block copolymer and a styrene-butadiene-styrene block copolymer.
  • the material of the superelastic film layer is not limited thereto, and may be other suitable materials that satisfy the above definition of superelasticity.
  • FIG. 3 is a schematic structural diagram of a connection layer according to an embodiment of the present disclosure.
  • the connection layer 202 further includes a first adhesive layer 2022 and a second adhesive layer 2023 interposed between the first adhesive layer 2022 and the second adhesive layer 2023.
  • the three-layer structure (sandwich structure) formed by the first adhesive layer 2022, the superelastic film layer 2021 and the second adhesive layer 2023 increases the thickness of the connection layer 202, and the increase in the thickness of the connection layer 202 can also serve to change the stress neutral layer. The role of the location.
  • the material of the first adhesive layer 2022 and the second adhesive layer 2023 includes an optical adhesive, which is a transparent adhesive for bonding optical components in an electronic device, has high transparency, and is used in an electronic device touch screen or a display screen. In the important part of bonding.
  • the material of the optical adhesive includes organic silica gel, acrylic resin, unsaturated polyester, polyurethane and epoxy resin.
  • the material of the superelastic film layer that has been found so far is not sticky, and the superelastic film layer 2021 and the flexible display are formed by forming the first adhesive layer 2022 and the second adhesive layer 2023 on both sides of the superelastic film layer, respectively.
  • the other film layers of the panel are connected.
  • the protective film 203 formed on the flexible display screen 201 includes an inorganic material film layer, inorganic Organic material mixed film layer, inorganic material film layer - organic material film layer - inorganic material film layer lamination, inorganic organic material mixed film layer - organic material film layer - inorganic organic material mixed film layer lamination; and inorganic material film layer - organic material
  • the film layer-inorganic organic material mixed film layer is laminated.
  • the material of the protective film 203 formed on the flexible display screen 201 includes polyimide, silicon nitride, silicon oxide or silicon oxynitride, and may further include inorganic materials such as aluminum oxide, titanium oxide, silicon nitride or silicon carbide.
  • the protective film can prevent the flexible display screen from being scratched by external force, and can also prevent water, oxygen and the like from entering the flexible display panel to damage the flexible display screen.
  • the flexible display's resistance to oxygen or moisture is an important parameter. Flexible displays are susceptible to oxygen or moisture. Oxygen or moisture penetration can cause problems with reduced performance and shortened life of flexible display panels. .
  • FIG. 4 is a schematic structural diagram of a flexible display panel according to at least one embodiment of the present disclosure.
  • the flexible display panel further includes a flexible support layer 204 disposed on a side of the flexible substrate 2011 remote from the flexible display screen 2012.
  • the flexible support layer 204 can support the flexible display screen 201, and can further Preventing water, oxygen, etc. from entering the flexible display panel causes damage to the flexible display screen.
  • the flexible display panel 200 further includes a circular polarizer 205 disposed on a side of the flexible display screen away from the flexible substrate 2011.
  • the material of the flexible supporting layer 204 includes polyethylene terephthalate or polyvinyl fluoride, and the above polyethylene terephthalate and polyvinyl fluoride materials are colorless transparent materials, and the light transmittance is greater than 90%. It should be noted that the material of the flexible supporting layer 204 is not limited to the above two materials, and may be other transparent flexible materials that support the flexible display screen.
  • the circular polarizer 205 includes a linear polarizer and a 1/4 wavelength optical retarder laminated on each other.
  • the circular polarizer 205 mainly serves to prevent the passage of the reflected light.
  • the circular polarizer 205 mainly includes a retardation film layer and a polarizing functional film layer.
  • the retardation film layer is the light exiting side of the circular polarizing film layer
  • the polarizing functional film layer is The light incident side of the circular polarizer film layer.
  • the main function of the polarizing functional film layer is to convert the natural light passing through the polarizing functional film layer into linearly polarized light;
  • the retardation film layer is preferably a quarter-wave retarder, whose main function is to make the passed linearly polarized light into a circle.
  • Polarized light or circularly polarized light that passes through, becomes linearly polarized light.
  • the polarizing functional film layer and the retardation film layer are combined, natural light is incident from the polarizing functional film layer, and becomes linearly polarized light after the polarizing functional film layer, and then the linearly polarized light passes through the retardation film layer and then changes from linearly polarized light to left-handed Circularly polarized light, after which the left-handed circularly polarized light is reflected back to become right-handed circularly polarized light, again passes through the phase difference film layer, and is rotated from the right circular
  • the light becomes linearly polarized light, and the linearly polarized light at this time is perpendicular to the previous linearly polarized light, and cannot pass through the linear polarizer, so that the reflected light cannot be transmitted from the polarizing functional film layer, thereby reducing ambient light. Influence, improve contrast.
  • the material of the polarizing functional film layer may be polyvinyl alcohol (PVA) or carbon nanotube (CNT), which is not limited herein. Since the carbon nanotube has a self-supporting function, when the carbon nanotube is used to form the polarizing functional film layer of the circular polarizing film layer, the flexible supporting layer can be omitted.
  • PVA polyvinyl alcohol
  • CNT carbon nanotube
  • FIG. 5 is a structural schematic view of the flexible display panel of FIG. 4 after being bent. It can be seen from FIG. 5 that the outer layer is subjected to the tensile force and the inner layer is subjected to the pressing force, and the structure of the flexible display panel shown in FIG. The mechanical simulation of the film layer stacking is performed, and when the connecting layer 202 formed by the three-layer structure of the first adhesive layer 2022, the superelastic film layer 2021 and the second adhesive layer 2023 is used, the stress neutral layer is on the flexible display 201 and the circular polarizer. Between 205, the flexible display panel 201 is closer to the flexible display panel, so that when the flexible display panel is bent, the flexible display panel 201 is not easily damaged.
  • the stress neutral layer is circularly polarized.
  • the stress neutral layer is far from the flexible display 201, and the flexible display panel is easily damaged when the flexible display panel is bent.
  • FIG. 6 is a schematic structural diagram of still another flexible display panel according to at least one embodiment of the present disclosure.
  • the flexible display panel further includes a touch screen 206 , and the touch screen 206 is disposed adjacent to the flexible display 201 .
  • One side of the film 203, that is, the touch screen 206 is disposed between the flexible display screen 201 and the circular polarizer 205, and the flexible display panel shown in FIG. 6 can simultaneously implement the touch and display functions.
  • FIG. 7 is a structural schematic view of the flexible display panel of FIG. 6 after bending, and the mechanical simulation of the film stacking of the structure of the flexible display panel shown in FIG. 6 is performed, and it is found that the first adhesive layer 2022 and the superelastic film layer are used.
  • the connection layer 202 is formed by the three-layer structure of the second adhesive layer 2023
  • the stress neutral layer is on the touch screen 206, which is close to the flexible display 201 and the touch screen 206, so that when the flexible display panel is bent, Both the flexible display 201 and the touch screen 206 are not easily damaged.
  • the stress neutral layer is on the circular polarizer 205.
  • the flexible display screen is subjected to an average strain of 0.92%; with the superelastic film layer 2021 provided by the embodiment of the present disclosure, the flexible display screen shown in FIG. 7 is subjected to an average strain of 0.68%, that is, Flexibility in embodiments of the present disclosure with respect to a flexible display panel formed using a common tie layer The strain of the display panel is reduced by 26%, thereby improving the flexibility of the flexible display panel.
  • the flexible substrate 2011 for a flexible display screen requires better performance in terms of surface topography, thermal stability, lower coefficient of thermal expansion, reliability, and the like.
  • flexible substrates for flexible displays include organic plastic substrates such as polycarbonate (PC), polyethylene terephthalate (PET), polyethylene terephthalate (PEN), polyethers. Sulfone (PES) and polyimide (PI).
  • the flexible substrate of the flexible display may have a coefficient of expansion of 1 to 70 ppm/° C., for example, 10 ppm/° C., 30 ppm/° C., 50 ppm/° C., 60 ppm/° C., and 70 ppm/° C.
  • FIG. 8 is a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure.
  • the flexible display device 300 includes any of the above flexible display panels.
  • the flexible display device provided by the embodiment of the present disclosure also has the same technical effects as the above flexible display panel. That is, the position of the stress neutral layer in the flexible display panel in the flexible display device can be changed by the superelastic film layer disposed in the flexible display panel, thereby reducing damage to the flexible display screen during bending of the flexible display panel.
  • the superelastic film layer can also reduce the bending force required for bending the flexible display device, and improve the ability of the flexible display device to return to deformation after being bent.
  • the display device can be, for example, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like, or any product or component having a display function.
  • FIG. 9 is a flowchart of a method for fabricating a flexible display panel according to an embodiment of the present disclosure.
  • the preparation method comprises:
  • Step 101 providing a flexible substrate
  • Step 102 Form a flexible display on a flexible substrate
  • Step 103 forming a connection layer on a side of the flexible display screen away from the flexible substrate;
  • Step 104 Forming a protective film on a side of the connecting layer facing away from the flexible display screen, the connecting layer comprising a superelastic film layer.
  • the material of the superelastic film layer includes at least one of ethylene propylene rubber, ethylene-butadiene-styrene block copolymer, and styrene-butadiene-styrene block copolymer, for example, the super
  • the material of the elastic film layer may be any one of ethylene propylene rubber, ethylene-butadiene-styrene block copolymer and styrene-butadiene-styrene block copolymer, or may be ethylene propylene rubber.
  • B a mixture of any two of an olefin-butadiene-styrene block copolymer and a styrene-butadiene-styrene block copolymer, which may also be ethylene propylene rubber or ethylene-butadiene-styrene
  • the material of the superelastic film layer is not limited thereto, and may be other suitable materials that satisfy the above definition of superelasticity.
  • connection layer further includes a first adhesive layer and a second adhesive layer
  • the superelastic film layer is interposed between the first adhesive layer and the second adhesive layer.
  • the three-layer structure formed by the first adhesive layer, the superelastic film layer and the second adhesive layer increases the thickness of the connecting layer and also functions to change the position of the stress neutral layer.
  • the materials of the first adhesive layer and the second adhesive layer include an optical adhesive, which is a transparent adhesive for bonding optical components in an electronic device, has high transparency, and is important for bonding touch screens and display screens of electronic devices. section.
  • the material of the optical adhesive includes silicone rubber, acrylic resin, unsaturated polyester, polyurethane and epoxy resin.
  • the material of the superelastic film layer that is currently found is not sticky, and the superelastic film layer and other flexible display panels are formed by forming a first adhesive layer and a second adhesive layer on both sides of the superelastic film layer, respectively.
  • the film structures are connected.
  • the protective film formed on the flexible display panel includes an inorganic material film layer, an inorganic organic material mixed film layer, an inorganic material film layer - an organic material film layer - an inorganic material film layer lamination, an inorganic organic material mixed film layer - an organic material film Layer-inorganic organic material mixed film layer stacking; and inorganic material film layer-organic material film layer-inorganic organic material mixed film layer stacking.
  • the material of the protective film formed on the flexible display screen includes polyimide, silicon nitride, silicon oxide or silicon oxynitride, and may also include inorganic materials such as aluminum oxide, titanium oxide, silicon nitride or silicon carbide. Organic materials such as polymethyl methacrylate.
  • the protective film can prevent the flexible display screen from being scratched by external force, and can also prevent water, oxygen and the like from entering the flexible display panel to damage the flexible display screen.
  • the flexible display's resistance to oxygen or moisture is an important parameter. Flexible displays are susceptible to oxygen or moisture. Oxygen or moisture penetration can cause problems with reduced performance and shortened life of flexible display panels. .
  • Embodiments of the present disclosure provide a flexible display panel, a method of fabricating the same, and a display device having at least one of the following beneficial effects:
  • a flexible display panel provided by at least one embodiment of the present disclosure, which can change a position of a stress neutral layer in a flexible display panel by a superelastic film layer disposed in the flexible display panel, thereby Reducing damage to the flexible display during bending of the flexible display panel;
  • the superelastic film layer can reduce the bending force required for bending the flexible display panel, and improve the ability of the flexible display panel to be deformed after being bent. .

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

一种柔性显示面板及其制备方法和显示装置。该柔性显示面板包括：柔性基板(2011)，在柔性基板(2011)上的柔性显示屏(2012)，在柔性显示屏(2012)的远离柔性基板(2011)的一侧的保护膜(203)，夹设在柔性显示屏(2012)和保护膜(203)之间的连接层(202)，连接层(202)包括至少一层超弹性膜层(2021)。该柔性显示面板中的超弹性膜层可以改变柔性显示面板中应力中性层的位置，从而可以减少在对柔性显示面板弯折的过程中对柔性显示屏带来的损害，除此之外，还可以提升柔性显示面板被弯折后回复形变的能力。

Description

柔性显示面板及其制备方法、显示装置
本申请要求于2017年2月21日递交的中国专利申请第201710094071.6号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及一种柔性显示面板及其制备方法和显示装置。
背景技术
柔性显示装置通过将显示器件形成在柔性基板上，使该柔性显示装置在被折叠或弯曲时也能正常显示信息，柔性显示装置在便携式电子设备等领域具有广泛的应用前景。
例如，柔性显示装置中的有机电致发光显示器件(OLED)主要包括由有机发光材料构成的有机发光层、阴极层、阳极层和功能层，在阴极层与阳极层之间施加适当的电压，以使得阳极的空穴和阴极的电子经过功能层后在有机发光层结合而电致发光，即OLED器件是自发光，OLED器件不需要背光源(Back-lighting)，因此OLED器件具有轻、薄等特点，除此之外，OLED器件还具有便于携带、可弯曲性的特点。
发明内容
本公开至少一实施例提供一种柔性显示面板，包括：柔性基板；柔性显示屏在所述柔性基板上；保护膜,在所述柔性显示屏的远离所述柔性基板的一侧；和连接层，夹设在所述柔性显示屏和所述保护膜之间，所述连接层包括至少一层超弹性膜层。
例如，在本公开至少一实施例提供的柔性显示面板中，所述连接层与所述柔性显示屏和所述保护膜直接接触。
例如，在本公开至少一实施例提供的柔性显示面板中，所述超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一。
例如，在本公开至少一实施例提供的柔性显示面板中，所述连接层还包括第一粘性层和第二粘性层，所述超弹性膜层夹设于所述第一粘性层和所述第二粘性层之间。
例如，在本公开至少一实施例提供的柔性显示面板中，所述第一粘性层和所述第二粘性层的材料包括光学胶。
例如，在本公开至少一实施例提供的柔性显示面板中，所述保护膜的材料包括聚酰亚胺、氮化硅、氧化硅或氮氧化硅。
例如，本公开至少一实施例提供的柔性显示面板，还包括柔性支撑层，其中，所述柔性支撑层设置在所述柔性基板的远离所述柔性显示屏的一侧。
例如，本公开至少一实施例提供的柔性显示面板，还包括圆偏光片，其中，所述圆偏光片设置在所述柔性显示屏的远离所述柔性基板的一侧。
例如，在本公开至少一实施例提供的柔性显示面板中，所述柔性支撑层的材料包括聚对苯二甲酸乙二醇酯或聚氟乙烯。
例如，在本公开至少一实施例提供的柔性显示面板中，所述圆偏光片包括层叠设置的线偏光片和1/4波长的光学延迟片。
例如，本公开至少一实施例提供的柔性显示面板，还包括触摸屏，其中，所述触摸屏设置在所述柔性显示屏的靠近所述保护膜的一侧。
本公开至少一实施例还提供一种柔性显示装置，包括上述任一柔性显示面板。
本公开至少一实施例还提供一种柔性显示面板的制备方法，包括：提供柔性基板；在所述柔性基板上形成柔性显示屏；在所述柔性显示屏的远离所述柔性基板的一侧形成连接层；在所述连接层的背离所述柔性显示屏的一侧形成保护膜，其中，所述连接层包括超弹性膜层。
例如，在本公开实施例提供的制备方法中，所述超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一。
例如，在本公开实施例提供的制备方法中，在形成所述超弹性膜层之前还包括先形成第一粘性层，形成所述超弹性膜层之后还包括形成第二粘性层。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为一种柔性显示面板的结构示意图；
图2为本公开一实施例提供的一种柔性显示面板的结构示意图；
图3为本公开一实施例提供的一种连接层的结构示意图；
图4为本公开另一实施例提供的一种柔性显示面板的结构示意图；
图5为图4中的柔性显示面板弯折后的结构示意图；
图6为本公开又一实施例提供的一种柔性显示面板的结构示意图；
图7为图6中的柔性显示面板弯折后的结构示意图；
图8为本公开一实施例提供的一种柔性显示装置的结构示意图；以及
图9为本公开一实施例提供的一种柔性显示面板的制备方法的流程图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
目前，柔性显示面板存在弯折后不易回复平整状态的问题，还存在显示器件与金属走线弯折应力较大的问题，尤其是将柔性显示面板弯曲成较 小的曲率半径时，易造成柔性显示面板的开裂、剥离、错位等故障。例如，图1为一种柔性显示面板的结构示意图，如图1所示，该柔性显示面板包括背板101、显示元件102、触控元件103、圆偏光片104以及保护膜106，圆偏光片104和保护膜106之间通过光学胶(optical clear adhesive,OCA)连接。由于起到减反射作用的圆偏光片104较厚，在图1所示的结构中，应力中性层位于圆偏光片104中，应力中性层距离显示面板和触控面板均较远，这样，当对图1所示的柔性显示面板进行弯折时，所需要的弯折力较大，对显示元件102和触控元件103的损害较大，且对柔性显示面板进行弯折后，其恢复形变的能力也较差。
需要说明的是，材料在弯曲的过程中，外层受拉伸力，内层受挤压力，在其断面上必然存在一个既不受拉伸力，又不受挤压力的过渡层，该过渡层的应力几乎为零，该过渡层即为材料的应力中性层。即应力中性层是指当材料发生弯曲变形时，其内部切向应力为零的所有位置所形成的面。应力中性层在弯曲过程中的长度和弯曲前一样，保持不变，应力中性层是计算弯曲件展开长度的基准。
例如，本公开的实施例公开了一种柔性显示面板，该柔性显示面板包括：柔性基板；柔性显示屏在柔性基板上；保护膜在柔性显示屏的远离柔性基板的一侧；和夹设在柔性显示屏和保护膜之间的连接层，该连接层包括至少一层超弹性膜层。
在本公开中，可以通过设置在柔性显示面板中的超弹性膜层改变柔性显示面板中应力中性层的位置，从而减少柔性显示面板弯折的过程中对柔性显示屏带来的损害，除此之外，该超弹性膜层还可以减小对柔性显示面板进行弯折所需要的弯折力，提升柔性显示面板被弯折后回复形变的能力。
本公开至少一实施例提供一种柔性显示面板，例如，图2为本公开一实施例提供的一种柔性显示面板的结构示意图。如图2所示，该柔性显示面板200包括柔性基板2011，设置在柔性基板2011上的柔性显示屏2012，设置在柔性显示屏2012的远离柔性基板2011一侧的保护膜203，以及夹设在柔性显示屏2012和保护膜203之间的连接层202，连接层202包括超弹性膜层2021。
需要说明的是，“超弹性”表示当施加力时会发生较大形变，当解除该力时发生复原的性质。通常的弹性材料在0.5％以下的形变就已经不能恢 复，在本说明书中，将能够实质上完全使1.0％以上的形变恢复的材料称为“超弹性”材料。其中，“完全”是指可以100％使得1.0％以上形变的材料恢复成形变之前的状态，进一步地，材料1.0％以上的形变可以实质上恢复98％也可以包括在内，进一步地，材料1.0％以上的形变可以实质上恢复95％也包括在内，进一步地，材料1.0％以上的形变可以实质上恢复90％也包括在内。
例如，该连接层202与柔性显示屏2012和保护膜203直接接触。
例如，该连接层202与柔性显示屏2012和保护膜203可以不直接接触，中间可以包括其他膜层，具体膜层由本领域技术人员根据实际需要设定。
例如，该超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一，例如，该超弹性膜层的材料可以是乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的任意一种，也可以是乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的任意两种形成的混合物，还可以是乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物三者形成的混合物。需要说明的是，该超弹性膜层的材料不限于此，还可以是满足上述超弹性定义的其他适合的材料。
例如，图3为本公开一实施例提供的一种连接层的结构示意图。该连接层202还包括第一粘性层2022和第二粘性层2023，超弹性膜层2021夹设于第一粘性层2022和第二粘性层2023之间。第一粘性层2022、超弹性膜层2021和第二粘性层2023形成的三层结构(三明治结构)增加了连接层202的厚度，该连接层202厚度的增加也可以起到改变应力中性层位置的作用。
例如，第一粘性层2022和第二粘性层2023的材料包括光学胶，该光学胶是指用于粘接电子设备中光学元件的透明胶，具有高透明度，是电子设备触摸屏、显示屏中用于粘接的重要部分。该光学胶的材料包括有机硅胶、丙烯酸型树脂、不饱和聚酯、聚氨酯和环氧树脂等。
需要说明的是，目前发现的超弹性膜层的材料不具有粘性，通过在超弹性膜层的两侧分别形成第一粘性层2022和第二粘性层2023来将超弹性膜层2021与柔性显示面板的其他膜层结构相连接。
例如，形成在柔性显示屏201上的保护膜203包括无机材料膜层、无机 有机材料混合膜层、无机材料膜层-有机材料膜层-无机材料膜层层叠、无机有机材料混合膜层-有机材料膜层-无机有机材料混合膜层层叠；以及无机材料膜层-有机材料膜层-无机有机材料混合膜层层叠。例如，形成在柔性显示屏201上的保护膜203的材料包括聚酰亚胺、氮化硅、氧化硅或氮氧化硅，还可以包括三氧化二铝、二氧化钛、氮化硅或碳化硅等无机材料，聚甲基丙烯酸甲酯等有机材料。该保护膜可以防止柔性显示屏被外界作用力刮擦，也可以防止水、氧气等进入柔性显示面板中对柔性显示屏造成破坏。柔性显示屏对氧气或湿气的抵抗能力是很重要的一个参数，柔性显示屏容易受到氧气或湿气的影响，氧气或湿气的渗透会带来柔性显示面板的性能降低和寿命缩短的问题。
例如，图4为本公开至少一实施例提供的一种柔性显示面板的结构示意图。该柔性显示面板还包括柔性支撑层204，该柔性支撑层204设置在柔性基板2011的远离柔性显示屏2012的一侧，该柔性支撑层204可以对柔性显示屏201起到支撑作用，还可以进一步防止水、氧气等进入柔性显示面板中对柔性显示屏造成破坏。
例如，如图4所示，该柔性显示面板200还包括圆偏光片205，圆偏光片205设置在柔性显示屏的远离柔性基板2011的一侧。
例如，柔性支撑层204的材料包括聚对苯二甲酸乙二醇酯或者聚氟乙烯，上述聚对苯二甲酸乙二醇酯和聚氟乙烯材料均为无色透明材料，透光率均大于90％。需要说明的是，柔性支撑层204的材料不限于上述两种材料，还可以是其他对柔性显示屏具有支撑作用的透明柔性材料。
例如，该圆偏光片205包括彼此层叠的线偏光片和1/4波长的光学延迟片。例如，圆偏光片205主要起防止反射光通过的作用，圆偏光片205主要包括相位差膜层和偏光功能膜层，相位差膜层为圆偏光片膜层的出光侧，偏光功能膜层为圆偏光片膜层的入光侧。偏光功能膜层的主要作用是将通过该偏光功能膜层的自然光转变为线偏振光；相位差膜层优选为四分之一波长延迟片，其主要作用是使通过的线偏振光变为圆偏振光，或将通过的圆偏振光变为线偏振光。将偏光功能膜层和相位差膜层结合，自然光从偏光功能膜层入射，经偏光功能膜层之后变为线偏振光，然后该线偏振光经过相位差膜层之后从线偏振光变为左旋圆偏振光，之后，当该左旋圆偏振光被反射回来后变为右旋圆偏振光，再次经过相位差膜层，从右旋圆偏振 光变为线偏振光，此时的线偏振光与之前的线偏振光呈垂直状态，不能通过线偏光片，这样反射光就不能够从该偏光功能膜层透过，从而减小环境光的影响，提高对比度。
例如，偏光功能膜层的材料可以为聚乙烯醇(PVA)，也可以为碳纳米管(CNT)，在此不做限定。由于碳纳米管具有自支撑功能，采用碳纳米管制作圆偏光片膜层的偏光功能膜层时，还可以省去柔性支撑层。
例如，图5为图4中的柔性显示面板弯折后的结构示意图，从图5中可以看出外层受拉伸力，内层受挤压力，对图4所示的柔性显示面板的结构进行膜层堆叠的力学模拟，发现采用第一粘性层2022、超弹性膜层2021和第二粘性层2023三层结构形成的连接层202时，应力中性层在柔性显示屏201和圆偏光片205之间，距离柔性显示屏201较近，这样在对柔性显示面板进行弯折时，对柔性显示屏201不易造成损坏，对应的，如果采用普通的连接层时，应力中性层在圆偏光片205的远离柔性显示屏201的一侧，由于圆偏光片205较厚，应力中性层距离柔性显示屏201较远，弯曲该柔性显示面板时对柔性显示屏201易造成损坏。
例如，图6为本公开至少一实施例提供的又一种柔性显示面板的结构示意图，如图6所示，该柔性显示面板还包括触摸屏206，该触摸屏206设置在柔性显示屏201的靠近保护膜203的一侧，即触摸屏206设置在柔性显示屏201和圆偏光片205之间，图6所示的柔性显示面板可以同时实现触控和显示功能。
例如，图7为图6中的柔性显示面板弯折后的结构示意图，对图6所示的柔性显示面板的结构进行膜层堆叠的力学模拟，发现采用第一粘性层2022、超弹性膜层2021和第二粘性层2023三层结构形成的连接层202时，应力中性层在触摸屏206上，距离柔性显示屏201和触摸屏206都很近，这样在对柔性显示面板进行弯折时，对柔性显示屏201和触摸屏206均不易造成损坏，对应的，如果采用普通的连接层时，应力中性层在圆偏光片205上，由于圆偏光片205较厚，应力中性层距离柔性显示屏201较远，弯曲该柔性显示面板时对柔性显示屏201易造成损坏。例如，采用普通的连接层，柔性显示屏受到的平均应变为0.92％；采用本公开的实施例提供的超弹性膜层2021，图7所示的柔性显示屏受到的平均应变为0.68％，即相对于采用普通的连接层形成的柔性显示面板，本公开的实施例中的柔性 显示面板的应变减小了26％，从而提升了柔性显示面板可弯折的能力。
例如，用于柔性显示屏的柔性基板2011要求在表面形貌、热稳定性、较低的热膨胀系数、可靠性等方面具有较佳的表现。例如，应用于柔性显示屏的柔性基板包括有机塑料基板，例如，聚碳酸酯(PC)、聚对苯二甲酸乙二酯(PET)、聚苯二甲酸乙二醇酯(PEN)、聚醚砜(PES)和聚酰亚胺(PI)等。
例如，柔性显示屏的柔性基板的膨胀系数可以为1～70ppm/℃，例如，10ppm/℃、30ppm/℃、50ppm/℃、60ppm/℃和70ppm/℃等。
本公开至少一实施例还提供一种柔性显示装置，例如，图8为本公开一实施例提供的一种柔性显示装置的结构示意图。该柔性显示装置300包括上述任意一种柔性显示面板。本公开的实施例提供的柔性显示装置也具有与上述柔性显示面板相同的技术效果。即可以通过设置在柔性显示面板中的超弹性膜层改变柔性显示装置中柔性显示面板中应力中性层的位置，从而减少在对柔性显示面板弯折的过程中对柔性显示屏带来的损害，除此之外，该超弹性膜层还可以减小对柔性显示装置进行弯折所需要的弯折力，提升柔性显示装置被弯折后回复形变的能力。
例如，该柔性显示装置300中的其他结构可参见常规设计。该显示装置例如可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
本公开至少一实施例还提供一种柔性显示面板的制备方法，例如，图9为本公开一实施例提供的一种柔性显示面板的制备方法的流程图。该制备方法包括：
步骤101：提供柔性基板；
步骤102：在柔性基板上形成柔性显示屏；
步骤103：在柔性显示屏的远离柔性基板的一侧形成连接层；
步骤104：在连接层的背离柔性显示屏的一侧形成保护膜，该连接层包括超弹性膜层。
例如，该超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一，例如，该超弹性膜层的材料可以是乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的任意一种，也可以是乙丙烯橡胶、乙 烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的任意两种形成的混合物，还可以是乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物三者形成的混合物。需要说明的是，该超弹性膜层的材料不限于此，还可以是满足上述超弹性定义的其他适合的材料。
例如，该连接层还包括第一粘性层和第二粘性层，超弹性膜层夹设于第一粘性层和第二粘性层之间。第一粘性层、超弹性膜层和第二粘性层形成的三层结构增加了连接层的厚度，也可以起到改变应力中性层位置的作用。
例如，第一粘性层和第二粘性层的材料包括光学胶，该光学胶是指用于粘接电子设备中光学元件的透明胶，具有高透明度，是电子设备触摸屏、显示屏粘接的重要部分。该光学胶的材料包括有机硅胶、丙烯酸型树脂、不饱和聚酯、聚氨酯和环氧树脂。
需要说明的是，目前发现的超弹性膜层的材料不具有粘性，通过在超弹性膜层的两侧分别形成第一粘性层和第二粘性层来将超弹性膜层与柔性显示面板的其他膜层结构相连接。
例如，形成在柔性显示屏上的保护膜包括无机材料膜层、无机有机材料混合膜层、无机材料膜层-有机材料膜层-无机材料膜层层叠、无机有机材料混合膜层-有机材料膜层-无机有机材料混合膜层层叠；以及无机材料膜层-有机材料膜层-无机有机材料混合膜层层叠。例如，形成在柔性显示屏上的保护膜的材料包括聚酰亚胺、氮化硅、氧化硅或氮氧化硅，还可以包括三氧化二铝、二氧化钛、氮化硅或碳化硅等无机材料，聚甲基丙烯酸甲酯等有机材料。该保护膜可以防止柔性显示屏被外界作用力刮擦，也可以防止水、氧气等进入柔性显示面板中对柔性显示屏造成破坏。柔性显示屏对氧气或湿气的抵抗能力是很重要的一个参数，柔性显示屏容易受到氧气或湿气的影响，氧气或湿气的渗透会带来柔性显示面板的性能降低和寿命缩短的问题。
本公开的实施例提供一种柔性显示面板及其制备方法和显示装置具有以下至少一项有益效果：
(1)本公开至少一实施例提供的柔性显示面板，可以通过设置在柔性显示面板中的超弹性膜层改变柔性显示面板中应力中性层的位置，从而 减少在对柔性显示面板弯折的过程中对柔性显示屏带来的损害；
(2)在本公开至少一实施例提供的柔性显示面板中，超弹性膜层可以减小对柔性显示面板进行弯折所需要的弯折力，提升柔性显示面板被弯折后回复形变的能力。
有以下几点需要说明：
(1)本公开实施例附图只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域的厚度被放大或缩小，即这些附图并非按照实际的比例绘制。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，该元件可以“直接”位于另一元件“上”或“下”，或者可以存在中间元件。
(3)在不冲突的情况下，本公开的实施例及实施例中的特征可以相互组合以得到新的实施例。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (15)

  1. 一种柔性显示面板，包括：
    柔性基板；
    柔性显示屏在所述柔性基板上；
    保护膜,在所述柔性显示屏的远离所述柔性基板的一侧；和
    连接层，夹设在所述柔性显示屏和所述保护膜之间，所述连接层包括至少一层超弹性膜层。
  2. 根据权利要求1所述的柔性显示面板，其中，所述连接层与所述柔性显示屏和所述保护膜直接接触。
  3. 根据权利要求1所述的柔性显示面板，其中，所述超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一。
  4. 根据权利要求1-3中任一项所述的柔性显示面板，其中，所述连接层还包括第一粘性层和第二粘性层，所述超弹性膜层夹设于所述第一粘性层和所述第二粘性层之间。
  5. 根据权利要求4所述的柔性显示面板，其中，所述第一粘性层和所述第二粘性层的材料包括光学胶。
  6. 根据权利要求1-5中任一项所述的柔性显示面板，其中，所述保护膜的材料包括聚酰亚胺、氮化硅、氧化硅或氮氧化硅。
  7. 根据权利要求1-6中任一项所述的柔性显示面板，还包括柔性支撑层，其中，所述柔性支撑层设置在所述柔性基板的远离所述柔性显示屏的一侧。
  8. 根据权利要求1-7中任一项所述的柔性显示面板，还包括圆偏光片，其中，所述圆偏光片设置在所述柔性显示屏的远离所述柔性基板的一侧。
  9. 根据权利要求7所述的柔性显示面板，其中，所述柔性支撑层的材料包括聚对苯二甲酸乙二醇酯或聚氟乙烯。
  10. 根据权利要求8所述的柔性显示面板，其中，所述圆偏光片包括层叠设置的线偏光片和1/4波长的光学延迟片。
  11. 根据权利要求1-10中任一项所述的柔性显示面板，还包括触摸屏，其中，所述触摸屏设置在所述柔性显示屏的靠近所述保护膜的一侧。
  12. 一种柔性显示装置，包括权利要求1-11中任一项所述的柔性显示面板。
  13. 一种柔性显示面板的制备方法，包括：
    提供柔性基板；
    在所述柔性基板上形成柔性显示屏；
    在所述柔性显示屏的远离所述柔性基板的一侧形成连接层；
    在所述连接层的背离所述柔性显示屏的一侧形成保护膜，其中，
    所述连接层包括超弹性膜层。
  14. 根据权利要求13所述的制备方法，其中，所述超弹性膜层的材料包括乙丙烯橡胶、乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-丁二烯-苯乙烯嵌段共聚物中的至少之一。
  15. 根据权利要求13所述的制备方法，其中，在形成所述超弹性膜层之前还包括先形成第一粘性层，形成所述超弹性膜层之后还包括形成第二粘性层。
PCT/CN2017/097064 2017-02-21 2017-08-11 柔性显示面板及其制备方法、显示装置 WO2018153035A1 (zh)

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