WO2021238793A1 - 支撑膜、oled显示结构及其制备方法 - Google Patents

支撑膜、oled显示结构及其制备方法 Download PDF

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Publication number
WO2021238793A1
WO2021238793A1 PCT/CN2021/095142 CN2021095142W WO2021238793A1 WO 2021238793 A1 WO2021238793 A1 WO 2021238793A1 CN 2021095142 W CN2021095142 W CN 2021095142W WO 2021238793 A1 WO2021238793 A1 WO 2021238793A1
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Prior art keywords
layer
substrate layer
oled display
film
adhesive
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PCT/CN2021/095142
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English (en)
French (fr)
Inventor
谷朋浩
Original Assignee
京东方科技集团股份有限公司
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Priority to US17/763,195 priority Critical patent/US12037526B2/en
Publication of WO2021238793A1 publication Critical patent/WO2021238793A1/zh

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    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure generally relates to the field of display panels, and particularly relates to supporting films, OLED display structures and preparation methods thereof.
  • OLED display devices have gradually become the first choice for screens. They have many advantages such as self-luminescence, high luminous efficiency, short response time, high definition and high contrast, and can also ensure that the screen has a certain degree of flexibility and flexibility. Adaptability. With the development of flexible display screens, people's expectations for foldable and curved display products are getting higher and higher.
  • the present disclosure provides a supporting film, an OLED display structure and a preparation method thereof.
  • a support film which includes a first adhesive material layer, a first substrate layer, and a first separation between the first substrate layer and the first adhesive material layer.
  • Type film is provided, which includes a first adhesive material layer, a first substrate layer, and a first separation between the first substrate layer and the first adhesive material layer.
  • the material of the first release film is silicone oil; the material of the first adhesive layer is acrylic resin; the material of the first substrate layer is polyethylene terephthalate .
  • the supporting film further includes a protective substrate layer located on a side of the first adhesive material layer away from the first substrate layer, and a protective substrate layer located on the first substrate layer away from the first substrate layer.
  • the protective film on one side of the first glue layer.
  • the supporting film further includes a second release film between the protective substrate layer and the first adhesive layer, wherein the material of the second release film is silicone oil;
  • the material of the protective substrate layer is polyethylene terephthalate or polyimide.
  • the supporting film further includes openings penetrating through the first substrate layer, the first release film, and the first adhesive layer.
  • the thickness of the first substrate layer is 25 ⁇ m to 100 ⁇ m.
  • the thickness of the first substrate layer is 50 ⁇ m.
  • a method for preparing an OLED display structure includes the steps of: providing a support film according to the above; attaching the support film to an OLED display device layer, wherein the OLED display device layer includes a display area and a bending Area; tear off a part of the first base material layer corresponding to the display area; attach a second base material layer at the position where the first base material layer is torn off, wherein the second base material layer and The materials of the first substrate layer are different.
  • the preparation method of the OLED display structure further includes: The material layer is cut to cut the first substrate layer into: a first part corresponding to the display area and a part of the bending area, and a second part corresponding to the remaining part of the bending area Part; while tearing off a part of the first base material layer corresponding to the display area, also tearing off the part of the first base material layer corresponding to the bending area; wherein, in the first base material layer Attaching the second base material layer to the torn-off position includes attaching the second base material layer so that it is spaced apart from the second part of the first base material layer by a certain distance.
  • the side of the first adhesive material layer away from the first substrate layer is provided with a protective substrate layer, and the first substrate layer is provided on the side away from the first adhesive material layer.
  • the method for preparing the OLED display structure further includes tearing off the protective substrate layer; Before the corresponding part of the area, the preparation method of the OLED display structure further includes tearing off the protective film.
  • the OLED display device layer includes a functional film layer, a first optical adhesive layer, and a window film layer arranged in sequence, the functional film layer, the first optical adhesive layer, and the The window film layer is in the display area.
  • the preparation method of the OLED display structure further includes the step of: placing the second substrate layer away from the A heat sink is attached to one side of the OLED display device layer, a double-sided adhesive layer is attached to the side of the heat sink away from the OLED display device layer, the remaining part of the first substrate layer is torn off, and the The bending area of the OLED display device layer is bent, wherein the first adhesive layer and the double-sided adhesive layer are pasted together; wherein, a second adhesive layer is attached to the outside of the bent OLED display device layer. Adhesive layer.
  • the material of the first substrate layer is polyethylene terephthalate, and the material of the second substrate layer is metal or polymer.
  • an OLED display structure which includes the above-mentioned supporting film.
  • FIG. 1a is a flowchart of a method for preparing an OLED display structure in an embodiment of the disclosure
  • FIG. 1b is a flowchart of the steps after replacing the second substrate layer in the method for preparing the OLED display structure in the embodiment of the disclosure
  • Fig. 2 shows a structural diagram of a supporting film of an embodiment of the present disclosure, wherein the supporting film has openings.
  • 3 to 9 show a process diagram of the preparation of the OLED display structure in an embodiment of the present disclosure, in which the supporting film has no openings.
  • FIGS 10 to 13 are diagrams of the preparation process of the OLED display structure in the embodiment of the disclosure, in which the supporting film has no openings.
  • the flexible display screen film layer usually includes a cover plate, a module functional film layer, a light-emitting film layer, a back plate film layer, a flexible substrate, a back support film and other film layer structures.
  • the supporting film plays a protective role under the display screen and achieves corresponding mechanical properties.
  • the general material of the supporting film is polyethylene terephthalate (PET) material or polyimide (PI) material.
  • PET polyethylene terephthalate
  • PI polyimide
  • the modulus of these materials is between 1Gpa and 10Gpa, and the optical properties are also good (at least reach a transmittance of more than 30%).
  • high modulus up to 100Gpa to 400Gpa
  • ultra-low modulus as 10Mpa to 500Mpa.
  • the modulus of the above materials is too large compared to existing materials, and the thermal and optical requirements cannot meet a certain transmittance. Therefore, all of them will cause difficulties for binding and related identification processes and cannot be applied.
  • the traditional solution is to design a regionalized support film, and use stable PET and glue for the binding area.
  • the substrate needs to be replaced. Since most of the traditional support films are designed to be pre-slotted to meet the bending needs of the circuit area, suppliers adopt integrated coil processing solutions to achieve mass production. If splicing is required, it cannot be pre-formed on the coil, and processing is difficult.
  • FIG. 1a is a flowchart of a method for preparing an OLED display structure in an embodiment of the disclosure. Referring to FIG. 1a in conjunction with FIG. 2 to FIG. 13, an embodiment of the present disclosure provides a method for preparing an OLED display structure, including the following steps S1 to S4:
  • Step S1 providing a supporting film, wherein the supporting film includes a first adhesive material layer 102 and a first base material layer 101 that are stacked, and the first base material layer 101 is connected to the first adhesive material layer 102.
  • the contact surface is released from the mold;
  • Step S2 attaching the support film to the OLED display device layer 3, wherein the OLED display device layer 3 includes a display area and a bending area;
  • Step S3 tear off a part of the first substrate layer 101 corresponding to the display area
  • Step S4 attach a second base material layer 201 at the position where the first base material layer 101 is torn off, wherein the second base material layer 201 and the first base material layer 101 are of different materials.
  • that the surface of the first substrate layer 101 in contact with the first adhesive material layer 102 undergoes a release treatment means that: between the first substrate layer 101 and the first substrate layer 101 A release agent is coated on the contact surface of a glue layer 102, and then the first substrate layer 101 and the release agent are cured into one body.
  • the material of the first adhesive layer is coated on the release-treated surface of the first substrate layer 101, or the release-treated first substrate is applied in a roll-to-roll manner.
  • the material layer 101 is bonded to the first adhesive material layer 102, so that the first adhesive material layer 102 and the first base material layer 101 are laminated and formed between the first adhesive material layer 102 and the first base material layer 101 There is a first release film 103 as shown in FIG. 2.
  • the release agent may be a siliceous treatment agent, usually a silicone oil.
  • the material of the first adhesive layer 102 is acrylic resin.
  • the adhesive material layer and the substrate layer included in the support film undergo a certain release treatment, so that a certain range of adhesion between the adhesive material layer and the substrate layer is achieved Requirements, to better meet the process requirements of peeling and avoid risks, so that the display area can be replaced with the support film substrate layer according to different folding or curved surface requirements, providing a process route and implementation plan for the formation of a regionalized back film .
  • FIG. 2 it is a schematic diagram of the structure of the supporting film, where the supporting film includes a first adhesive layer 102 and a first base material layer 101 that are stacked, and a slightly weaker release process is performed between the two. Specifically, after the release process is performed between the first adhesive material layer 102 and the first base material layer 101, a first release film 103 is formed between the first adhesive material layer 102 and the first base material layer 101 ,as shown in picture 2.
  • the material of the first release film 103 is silicone oil.
  • the first adhesive layer and the first substrate layer are only in the range of 5gf/Inch to 20gf/Inch, so that the support film can achieve the above-mentioned effects when it is prepared, and the accuracy can be guaranteed; At the same time, the frame can be narrower and the process feasibility is high.
  • a support film with a viscosity within the above range is directly used to better meet the needs of subsequent processes, and facilitate the removal of the first substrate layer from the first adhesive layer, so that the first The replacement of a substrate layer becomes more convenient. Furthermore, in the subsequent process, the display area can be replaced with the first base material layer according to different requirements to meet more process requirements for folding or curved surfaces.
  • a protective substrate layer 1 is provided on the side of the first adhesive material layer 102 away from the first substrate layer 101, and the first substrate layer 101 is away from the first substrate layer 101.
  • a protective film 2 is provided on one side of the glue layer 102.
  • the method for preparing the OLED display structure before attaching the support film to the OLED display device layer 3, further includes tearing off the protective substrate layer 1.
  • attaching the support film to the OLED display device layer 3 includes attaching the side of the first adhesive material layer 102 away from the first substrate layer 101 to the OLED display device. Device layer 3.
  • the method for preparing the OLED display structure before tearing off the first substrate layer 101 corresponding to the position of the display area on the supporting film, the method for preparing the OLED display structure further includes tearing off the protective film 2.
  • the surface of the protective substrate layer 1 in contact with the first adhesive layer 102 undergoes a release treatment.
  • a second release film (not shown in the figure) is formed on the protective substrate layer 1 and the first adhesive layer 102.
  • the material of the second release film is silicone oil.
  • the material for protecting the substrate layer 1 includes polymer materials such as PET and PI.
  • the upper and lower layers of the support film are respectively attached to the protective substrate layer 1 and the protective film 2, which need to be torn off in the subsequent process.
  • the adhesive force between the protective substrate layer 1 and the first adhesive material layer 102 is 0 to 5 gf/Inch, which facilitates better tearing off of the protective substrate layer 1 in the subsequent process; tearing off the protective substrate layer 1
  • the OLED display device layer 3 is attached to the support film at the position where the protective substrate layer 1 is torn off.
  • the OLED display device layer includes a display area and a bending area.
  • the existing first substrate layer is usually made of PET material, and its elastic modulus is between 1Gpa and 8Gpa, and it does not have high resilience properties and has poor tensile properties. Therefore, it is necessary when the screen is folded or curved.
  • Replace the first substrate layer Replace the first base material layer with a metal material or a second base material layer of a polymer material.
  • the high elastic modulus (100Gpa to 400Gpa) or low elastic modulus (10Mpa to 500Mpa) of the second base material layer can be based on actual conditions Make a selection.
  • the replaced second base material layer and the first adhesive material layer have an adhesive force greater than 500 gf/Inch.
  • a functional film layer 4, a first optical adhesive layer 5, and a window film layer 6 are sequentially arranged above the OLED display device layer 3.
  • the mixture layer 5 and the window film layer 6 are in the display area.
  • the functional film layer 4 provided above the OLED display device layer includes, for example, a touch control layer and a polarizer.
  • the functional film layer 4, the first optical adhesive layer 5 and the window film layer 6 are all arranged in the display area. After the OLED display device layer 3 is bonded to the supporting film, subsequent processing steps are performed.
  • the window film layer 6 is used to protect the OLED display device layer to a certain extent.
  • Figures 4 to 6 show the steps of replacing the first substrate layer described above.
  • Fig. 4 shows a structural diagram after the protective film is removed.
  • FIG. 5 it is a structural diagram after tearing off the first substrate layer corresponding to the display area on the supporting film.
  • the first base material layer corresponding to the display area on the support film is torn off, and the base material layer that needs to be torn off is peeled off by means of roller bonding.
  • FIG. 6 it is a structural diagram after attaching the second base material layer at the position of the torn off the first base material layer.
  • the substrate layer of the support film is replaced to meet the needs of more forms.
  • the thickness of the second substrate layer 201 is equal to the thickness of the first substrate layer 101. But the present disclosure is not limited to this. In other embodiments of the present disclosure, the thickness of the replaced second substrate layer may also be different from the thickness of the first substrate layer, because after the cover plate of the OLED display structure is attached, there is no need to worry about the influence of the subsequent step difference. .
  • the thickness of the first substrate layer is 25 ⁇ m to 100 ⁇ m, and the preferred thickness is 50 ⁇ m.
  • FIG. 1b is a flowchart of the steps after replacing the second substrate layer in the method for preparing the OLED display structure in the embodiment of the disclosure. Further, as shown in FIG. 1b, after the second substrate layer 201 is replaced, the method for preparing the OLED display structure further includes the following steps:
  • Step S41 Attach a heat sink 7 to the side of the second substrate layer 201 away from the OLED display device layer 3, and attach a double-sided heat sink 7 to the side of the heat sink 7 away from the OLED display device layer 3.
  • Step S42 tear off the remaining part of the first base material layer 101, as shown in FIG. 8;
  • Step S43 bending the bending area of the OLED display device layer 3, wherein the first adhesive layer 102 and the double-sided adhesive layer 8 are pasted together to obtain a bent OLED display device 9;
  • the right end of the OLED display device layer 3 is flush with the right end of the first adhesive layer 102.
  • a second adhesive layer 301 is attached to the outside of the folded OLED display device layer 3, and the second adhesive layer 301 is formed from the bent OLED display device layer 3 One end extends to the other end, in a semicircular shape, as shown in Figure 9.
  • the material of the second adhesive layer 301 is acrylic resin.
  • the material of the heat sink 7 may include stainless steel, Cu, and the like.
  • the OLED display panel before bending the OLED display panel, first attach a heat sink to the second substrate layer, and attach a double-sided adhesive layer to the heat sink, as shown in FIG. Subsequently, the remaining first substrate layer is torn off, that is, the first substrate layer corresponding to the bending area is torn off, as shown in FIG. 8. The first substrate layer is removed, and the glue layer is retained, so that the folded stack structure reduces the thickness of the corresponding first substrate layer, can achieve a smaller bending radius, and further achieve a smaller frame.
  • the presence of the first adhesive layer makes the combination between the OLED display device layer and the double-sided adhesive stronger; and then it is bent, and the second adhesive layer 301 is pasted on the outside of the bending position.
  • the material layer protects the circuit in the bending area to avoid damage.
  • the display structure after bending finally realizes the regionalized design of the support material and the effect of a smaller frame.
  • the support film has an opening 104 that penetrates the first substrate layer 101, the first release film 103, and the first adhesive layer 102.
  • the opening 104 is located at a position corresponding to the bending area of the OLED display device layer. As shown in FIGS. 2-9, the opening 104 is arranged so that the display area and the support film of the bending area are separated, which is more convenient for the first substrate. The peeling of the layer, the peeling of the first base material layer in the display area and the peeling of the first base material layer in the bending area have no influence on each other.
  • the supporting film does not have openings, and is an entire film structure.
  • the first base material layer 101 of the support film is cut to cut the first base material layer into: a first part corresponding to the display area and a part of the bending area, and The remaining part of the bending area corresponds to the second part.
  • the first substrate layer 101 is cut along the broken line A-A.
  • the first part of the first base layer 101 is torn off, as shown in FIG. 11.
  • the length of the second base material layer 201 is shorter than the length of the first base material layer that is torn off, so that there is a certain space between the second base material layer 201 and the first base material layer 101 that is not torn off, as shown in FIG. 12 shown. Then, perform the process steps described in step S41 and step S42 on the structure of the bonded second substrate layer 201 and bend the bending area to obtain a bent OLED display structure, as shown in FIG. 13.
  • the right end of the OLED display device layer 3 is flush with the right end of the first adhesive layer 102.
  • a second adhesive layer 301 is attached to the outside of the folded OLED display device layer 3, and the second adhesive layer 301 is formed from the bent OLED display device layer 3 Extend from one end to the other end in a semicircular shape, as shown in Figure 13.
  • a laser can be used to perform a half-cutting process on the support film.
  • the OLED display device layer is bent in the above manner, because the first adhesive material layer 102 on the supporting film remains in the bending area, both sides of the OLED display device in the bent area are covered by the adhesive material. That is, the OLED display device layer is sandwiched between two adhesive layers to protect the circuit, as shown in FIG. 13.
  • the adhesion between the first substrate layer and the first adhesive layer is 5 gf/Inch to 20 gf/Inch.
  • the viscosity is 10 gf/Inch to 15 gf/Inch.
  • the adhesion between the protective substrate layer and the first adhesive layer is 0 to 5 gf/Inch.
  • the adhesive force between the first adhesive layer and the first substrate layer reaches the range of 5gf/Inch to 20gf/Inch, and preferably the adhesive force is 10gf/Inch to 15gf/Inch, so that the adhesive A certain range of adhesion requirements between the layer and the substrate layer are required to better meet the requirements of the peeling process and avoid risks, so that the display area can be replaced with the substrate layer of the support film according to the requirements related to different folds or curved surfaces. It provides a process route and implementation plan for the formation of a regionalized back film.
  • the support film with the viscosity within the above range is directly used for preparation, so that it can better meet the needs of subsequent processes, and facilitate the glass of the first substrate layer from the first adhesive layer, so that The replacement of the first substrate layer becomes more convenient.
  • the support film cannot be processed regionally and the existing support film
  • the base material and the adhesive material are very tightly combined and most of the back films currently do not need to be removed and replaced. Therefore, in the present disclosure, a certain release process is performed between the substrate and the glue material included in the support film to facilitate the removal of the substrate from the support film.
  • the substrate in the area that needs to be replaced is removed at any time and replaced with a substrate of other materials to achieve the effect of optimizing the material of the display area on the display panel, which can meet the diverse needs of the display panel , And easy to process.
  • the present disclosure designs a solution for realizing regionalization in the factory, the incoming materials are integrated, and the process is stable, and its stability can continue after the cover plate is attached. When the subsequent metal parts are attached, the film can be directly changed to realize the regionalized support film and at the same time reduce the overall thickness.
  • the embodiments of the present disclosure also provide an OLED display structure prepared by the above method.
  • the OLED display structure provided by the embodiments of the present disclosure includes the supporting film described herein.
  • the OLED display structure provided by the embodiments of the present disclosure can be applied to full-screen design, folding screen design, and related curved surface design.

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Abstract

一种支撑膜、OLED显示结构及其制备方法。所述支撑膜包括叠层设置的第一胶材层（102）、第一基材层（101）、以及在所述第一基材层（101）与所述第一胶材层（102）之间的第一离型膜（103）。

Description

支撑膜、OLED显示结构及其制备方法
相关申请的交叉引用
本申请要求于2020年5月27日提交的中国专利申请No.202010463440.6的优先权，该专利申请的全部内容通过引用方式合并于此。
技术领域
本公开一般涉及显示面板领域，尤其涉及支撑膜、OLED显示结构及其制备方法。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)显示装置逐渐成为屏幕的首选，其具有自发光、发光效率高、响应时间短、清晰度与对比度高等诸多优点，同时还可以保证屏幕具有一定柔性与可适应性。随着柔性显示屏幕的发展，人们对可折叠及曲面显示产品的期望越来越高。
发明内容
本公开提供一种支撑膜、OLED显示结构及其制备方法。
第一方面，提供一种支撑膜，包括叠层设置的第一胶材层、第一基材层、以及在所述第一基材层与所述第一胶材层之间的第一离型膜。
在一些实施例中，所述第一离型膜的材料为硅油；所述第一胶材层的材料是丙烯酸树脂；所述第一基材层的材料是聚对苯二甲酸乙二醇酯。
在一些实施例中，所述支撑膜还包括位于所述第一胶材层的远离所述第一基材层的一侧的保护基材层，和位于所述第一基材层远离所述第一胶材层的一侧的保护膜。
在一些实施例中，所述支撑膜还包括在所述保护基材层与所述第一胶材层之间的第二离型膜，其中，所述第二离型膜的材料为硅油； 所述保护基材层的材料为聚对苯二甲酸乙二醇酯或聚酰亚胺。
在一些实施例中，所述支撑膜还包括贯穿所述第一基材层、所述第一离型膜、所述第一胶材层的开口。
在一些实施例中，所述第一基材层厚度为25μm至100μm。
在一些实施例中，所述第一基材层厚度为50μm。
第二方面，提供一种OLED显示结构制备方法，其包括步骤：提供根据上述支撑膜；将所述支撑膜贴附到OLED显示器件层，其中，所述OLED显示器件层包括显示区域和弯折区域；撕除第一基材层的与所述显示区域对应的一部分；在所述第一基材层被撕除的位置贴附第二基材层，其中，所述第二基材层与所述第一基材层材质不相同。
在一些实施例中，在撕除所述支撑膜上与所述显示区域位置对应的第一基材层之前，所述OLED显示结构制备方法还包括：对所述支撑膜的所述第一基材层进行切割，以将所述第一基材层切割成：与所述显示区域和与所述弯折区域的一部分对应的第一部分、和与所述弯折区域的剩余部分对应的第二部分；撕除第一基材层的与所述显示区域对应的一部分的同时，还撕除第一基材层的与所述弯折区域对应的部分；其中，在所述第一基材层被撕除的位置贴附第二基材层包括贴附所述第二基材层使得其与所述第一基材层的所述第二部分间隔开一定距离。
在一些实施例中，所述第一胶材层远离所述第一基材层的一侧设置有保护基材层，所述第一基材层远离所述第一胶材层的一侧设置有保护膜，在将所述支撑膜贴附到OLED显示器件层之前，所述OLED显示结构制备方法还包括撕除所述保护基材层；在撕除第一基材层的与所述显示区域对应的一部分之前，所述OLED显示结构制备方法还包括撕除所述保护膜。
在一些实施例中，所述OLED显示器件层包括依次设置的功能膜层、第一光学粘合剂层和窗膜层，所述功能膜层、所述第一光学粘合剂层和所述窗膜层在所述显示区域中。
在一些实施例中，在所述第一基材层被撕除的位置贴附第二基材层之后，所述OLED显示结构制备方法还包括步骤：在所述第二基材 层远离所述OLED显示器件层的一侧贴附散热件，在所述散热件远离所述OLED显示器件层的一侧贴附双面胶层，撕除所述第一基材层的剩余部分，将所述OLED显示器件层的弯折区域进行弯折，其中，所述第一胶材层与所述双面胶层粘贴在一起；其中，弯折的所述OLED显示器件层外侧还贴附有第二胶材层。
在一些实施例中，所述第一基材层的材料为聚对苯二甲酸乙二醇酯，所述第二基材层的材料为金属或者高分子。
第三方面，提供一种OLED显示结构，其包括上述支撑膜。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本公开的其它特征、目的和优点将会变得更明显：
图1a为本公开的实施例中OLED显示结构制备方法流程图；
图1b为本公开的实施例中OLED显示结构制备方法中在更换好第二基材层之后的步骤的流程图；
图2示出了本公开的实施例的支撑膜的结构图，其中，支撑膜开具有开口。
图3至图9示出了本公开的实施例中OLED显示结构制备过程图，其中，支撑膜没有开口。
图10至图13为本公开的实施例中OLED显示结构制备过程图，其中，支撑膜没有开口。
具体实施方式
目前，柔性显示屏幕膜层通常包括盖板、模组功能膜层、发光膜层、背板膜层、柔性衬底、背面支撑膜等膜层结构。
在柔性显示装置中，支撑膜在显示屏下起到保护作用并实现相应力学性能。目前，支撑膜通用材料为聚对苯二甲酸乙二醇酯(Polyethylene terephthalate，PET)材料，或者聚酰亚胺(polyimide，PI)材料。这些材料的模量都在1Gpa至10Gpa之间，光学性能也较好(至少达到30％以上的透过率)。但是随着结构设计及不同功能及性 能的要求，对于高模量(高达100Gpa至400Gpa)且可能不具有光学透过率的支撑膜基材，提出了相应的应用。也有部分对于超低模量(低达10Mpa至500Mpa)的支撑膜基材的需求。以上材料的模量相比现有材料差异过大，同时热学及光学要求无法满足一定透过率，因此，均会对于绑定及相关识别工艺造成困难，无法应用。
传统的解决方案是：设计区域化支撑膜，绑定区域采用稳定的PET及胶材。为了实现折叠/曲面及其他更高要求，则需要更换基材。由于传统的支撑膜大多被设计为是预先开槽的，以满足电路区弯折需要，因此，供应商采用一体化卷材加工的方案实现大量生产。如需要拼接的话，在卷材上无法预先成型，且加工困难。
下面结合附图和实施例对本公开作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本公开，而非对本公开的限制。另外还需要说明的是，为了便于描述，附图中仅示出了与公开相关的部分。
需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本公开。
图1a为本公开的实施例中OLED显示结构制备方法流程图。参考图1a并结合图2至图13，本公开的实施例提供一种OLED显示结构制备方法，包括以下步骤S1至S4：
步骤S1，提供支撑膜，其中，所述支撑膜包括叠层设置的第一胶材层102和第一基材层101，所述第一基材层101的与所述第一胶材层102接触的表面经过离型处理；
步骤S2，将所述支撑膜贴附到OLED显示器件层3，其中，所述OLED显示器件层3包括显示区域和弯折区域；
步骤S3，撕除第一基材层101的与所述显示区域对应的一部分；
步骤S4，在所述第一基材层101被撕除的位置贴附第二基材层201，其中，所述第二基材层201与所述第一基材层101材质不相同。
在本公开的实施例中，所述第一基材层101的与所述第一胶材层102接触的表面经过离型处理是指：在所述第一基材层101的与所述 第一胶材层102接触的表面上涂布离型剂，然后使所述第一基材层101与离型剂固化成一体。在本公开的实施例中，将第一胶材层的材料涂布到第一基材层101的离型处理后的表面上，或者采用卷对卷的方式对离型处理后的第一基材层101与第一胶材层102进行贴合，使得第一胶材层102和第一基材层101叠层设置，并且在第一胶材层102和第一基材层101之间形成有如图2所示的第一离型膜103。
在本公开的实施例中，离型剂可以是硅质处理剂，通常为硅油。在本公开的实施例中，第一胶材层102的材料是丙烯酸树脂。
在本公开的实施例中，通过提供支撑膜，该支撑膜包括的胶材层和基材层之间经过一定的离型处理，使得胶材层和基材层之间达到一定的粘力范围要求，更好的满足剥离的工艺需求，避免风险，使得显示区域可以根据不同的折叠或者曲面涉及的要求进行支撑膜基材层的更换，为区域化背膜的形成提供了工艺路线和实现方案。
如图2所示，为支撑膜的结构示意图，其中支撑膜包括叠层设置的第一胶材层102和第一基材层101，两者之间进行稍弱的离型处理。具体地，在第一胶材层102和第一基材层101之间进行了离型处理之后，在第一胶材层102和第一基材层101之间形成了第一离型膜103，如图2所示。
在本公开的实施例中，所述第一离型膜103的材料为硅油。
相比较现有技术中第一胶材层和第一基材层之间1500gf/Inch甚至更高的粘力，由于第一离型膜103的存在，本公开的实施例第一胶材层和第一基材层之间的粘力(或称为剥离力或结合力度)只有5gf/Inch至20gf/Inch的范围，使得该支撑膜在制备的时候即能实现上述效果，且能够保证精度；同时使得边框可以实现更窄且工艺可行性高。在OLED显示结构制备工艺中，直接采用粘力在上述范围内的支撑膜，使其更好的满足后续工艺的需求，便于第一基材层从第一胶材层上的撕除，使得第一基材层的更换变得更加方便。更进一步的，在后续的工艺中显示区域可以根据不同的需求进行第一基材层的更换，满足折叠或者曲面的更多工艺需求。
进一步的，如图2所示，所述第一胶材层102远离所述第一基材 层101的一侧设置有保护基材层1，所述第一基材层101远离所述第一胶材层102的一侧设置有保护膜2。
在本公开的实施例中，在将所述支撑膜贴附到OLED显示器件层3之前，所述OLED显示结构制备方法还包括撕除所述保护基材层1。在本公开的实施例中，在步骤S2中，将所述支撑膜贴附到OLED显示器件层3包括将第一胶材层102的远离第一基材层101的一侧贴附到OLED显示器件层3。
在本公开的实施例中，在撕除所述支撑膜上与所述显示区域位置对应的第一基材层101之前，所述OLED显示结构制备方法还包括撕除所述保护膜2。
在本公开的实施例中，保护基材层1与所述第一胶材层102接触的表面经过离型处理。在离型处理之后，在保护基材层1与所述第一胶材层102形成第二离型膜(图中未示出)。在本公开的实施例中，所述第二离型膜的材料为硅油。在本公开的实施例中，保护基材层1的材料包括PET、PI等高分子材料。
支撑膜上下两层分别贴附保护基材层1和保护膜2，在后续的工艺中需要对二者进行撕除。其中，保护基材层1和第一胶材层102之间的粘力为0至5gf/Inch，便于后续工艺中更好的对保护基材层1进行撕除；撕除保护基材层1后，在撕除保护基材层1的位置处在支撑膜上贴附OLED显示器件层3。该OLED显示器件层包括有显示区域和弯折区域。
现有的第一基材层通常为PET材料，其弹性模量在1Gpa至8Gpa之间，且不具有高回弹性质、且拉伸性能较差，因此，在屏幕折叠或者曲面设计的时候需要更换第一基材层。将第一基材层更换成金属材料或者高分子材料的第二基材层，第二基材层的高弹性模量(100Gpa至400Gpa)或者低弹性模量(10Mpa至500Mpa)可根据实际情况进行选择。更换后的第二基材层和第一胶材层之间具有大于500gf/Inch的粘力。
在本公开的实施例中，在所述OLED显示器件层3上方依次设置有功能膜层4、第一光学粘合剂层5和窗膜层6，所述功能膜层4、第 一光学粘合剂层5和窗膜层6在所述显示区域中。
如图3所示，在OLED显示器件层上方设置的功能膜层4包括，例如，触控层与偏光片。所述功能膜层4、第一光学粘合剂层5和窗膜层6均设置在显示区域。所述OLED显示器件层3与所述支撑膜贴合好之后，再进行后续工艺步骤。窗膜层6用于对OLED显示器件层进行一定的保护。
如图4至图6所示为上述进行第一基材层更换的步骤。图4中示出了撕除了保护膜之后的结构图。随后如图5所示，是撕除了支撑膜上与显示区域对应的第一基材层之后的结构图。具体的，撕除所述支撑膜上与显示区域对应的所述第一基材层采用滚轮粘接的方式对需要被撕除的基材层进行撕除。随后如图6所示，是在撕除的第一基材层的位置进行第二基材层的贴附之后的结构图。进行支撑膜的基材层的更换以满足更多形态的需求。
在本公开的实施例中，所述第二基材层201厚度等于所述第一基材层101厚度。但是本公开不限于此。在本公开的其他实施例中，更换的第二基材层的厚度也可以与第一基材层的厚度不相同，因为在完成OLED显示结构的盖板贴合之后，不用担心后续段差的影响。
在本公开的实施例中，所述第一基材层厚度为25μm至100μm，优选的厚度为50μm。
图1b为本公开的实施例中OLED显示结构制备方法中在更换好第二基材层之后的步骤的流程图。进一步的，如图1b所示，在更换好第二基材层201之后，所述OLED显示结构制备方法还包括步骤：
步骤S41、在所述第二基材层201远离所述OLED显示器件层3的一侧贴附散热件7，在所述散热件7远离所述OLED显示器件层3的一侧贴附双面胶层8，如图7所示；
步骤S42、撕除所述第一基材层101的剩余部分，如图8所示；
步骤S43、将所述OLED显示器件层3的弯折区域进行弯折，其中，所述第一胶材层102与所述双面胶层8粘贴在一起，以得到弯折后的OLED显示器件层，如图9所示；在本公开的实施例中，在弯折前，如图8所示，所述OLED显示器件层3的右端与所述第一胶材层 102的右端齐平。
在本公开的实施例中，弯折后的所述OLED显示器件层3外侧还贴附有第二胶材层301，第二胶材层301从所述OLED显示器件层3的弯折后的一端延伸到另一端，呈半圆形，如图9所示。
在本公开的实施例中，第二胶材层301的材料是丙烯酸树脂。
在本公开的实施例中，在弯折后，所述OLED显示器件层3的端部与所述第一胶材层102的端部依旧齐平，如图9所示。
在本公开的实施例中，散热件7的材料可以包括不锈钢、Cu等。
如图7至图9所示，在进行OLED显示面板弯折之前，首先在第二基材层上贴附散热件，散热件上贴附双面胶层，如图7所示。随后，将剩余的第一基材层撕除，即，对弯折区域对应的第一基材层进行撕除，如图8所示。去除第一基材层，保留胶材层，使得弯折后的堆叠结构减少了相应的第一基材层的厚度，可以实现更小的弯折半径，进一步的实现更小的边框。同时第一胶材层的存在使得OLED显示器件层与双面胶之间的结合更加强韧；然后再进行弯折，在弯折位置的外侧贴第二胶材层301，通过该第二胶材层对弯折区域的电路进行保护，避免损伤，弯折后的显示结构最终实现了支撑材料区域化的设计以及更小边框的效果。
进一步的，所述支撑膜具有开口104，所述开口104贯穿所述第一基材层101、所述第一离型膜103、所述第一胶材层102。所述开口104位于对应于所述OLED显示器件层的弯折区域的位置，如图2至图9所示，开口的设置使得显示区域和弯折区域的支撑膜分开，更便于第一基材层的撕除，在显示区域中的第一基材层的撕除和在弯折区域中的第一基材层的撕除相互之间没有影响。
在本公的其他实施例中，支撑膜上不具有开口，为一整个膜层结构。在进行显示区域的第一基材层撕除之前，还需要对支撑膜进行半切工艺。具体地，将支撑膜的第一基材层101进行切割以将所述第一基材层切割成：与所述显示区域和与所述弯折区域的一部分对应的第一部分、和与所述弯折区域的剩余部分对应的第二部分。如图10所示，沿虚线A-A对第一基材层101进行切割。然后，第一基材层101的第 一部分进行撕除，如图11所示。在在所述第一基材层101被撕除的位置替换上第二基材层201，如图12所示。其中，第二基材层201的长度比撕掉的第一基材层的长度短，使得在第二基材层201与未撕除的第一基材层101之间存在一定空间，如图12所示。再对贴合好第二基材层201的结构进行如步骤S41和步骤S42所述的工艺步骤并对弯折区域进行弯折，以得到弯折后的OLED显示结构，如图13所示。
在本公开的实施例中，在弯折前，如图12所示，所述OLED显示器件层3的右端与所述第一胶材层102的右端齐平。
在本公开的实施例中，弯折后的所述OLED显示器件层3外侧还贴附有第二胶材层301，第二胶材层301从所述OLED显示器件层3的弯折后的一端延伸到另一端，呈半圆形，如图13所示。
在本公开的实施例中，在弯折后，所述OLED显示器件层3的端部与所述第一胶材层102的端部依旧齐平，如图13所示。
在本公开的实施例中，可以采用激光对支撑膜进行半切工艺。
以上述方式进行OLED显示器件层的弯折时，因为弯折区域仍保留有支撑膜上的第一胶材层102，使得弯折后的区域OLED显示器件两侧均被胶材料覆盖。即，OLED显示器件层被夹在两层胶材层之间，对电路进行保护，如图13所示。
进一步的，所述第一基材层和所述第一胶材层之间的粘力为5gf/Inch至20gf/Inch。优选的，所述粘力为10gf/Inch至15gf/Inch。
所述保护基材层与所述第一胶材层之间的粘力为0至5gf/Inch。
本公开的实施例第一胶材层和第一基材层之间的粘力达到5gf/Inch至20gf/Inch的范围，优选的所述粘力为10gf/Inch至15gf/Inch，使得胶材层和基材层之间达到一定的粘力范围要求，更好的满足剥离的工艺需求，避免风险，使得显示区域可以根据不同的折叠或者曲面涉及的要求进行支撑膜的基材层的更换，为区域化背膜的形成提供了工艺路线和实现方案。在OLED显示结构制备工艺中，直接采用粘力在上述范围内的支撑膜进行制备，使其更好的满足后续工艺的需求，便于第一基材层从第一胶材层上进行玻璃，使得第一基材层的更换变得更加方便。
在实际的工艺过程中需要根据实际的需求采用不同的支撑材料进行显示结构的制备，但是在提供支撑膜的供应商来说，无法对支撑膜进行区域化的加工并且现有的支撑膜上的基材和胶材结合非常紧密并且目前大多数背膜都是不需要撕除替换的。因此，本公开中通过将支撑膜包括的基材和胶材之间进行一定的离型处理，便于将基材从支撑膜上进行撕除。在显示结构制备工艺过程中，随时将需要替换的区域的基材撕除，替换成其他材质的基材，实现显示面板上的显示区域材质的优化等效果，既能满足显示面板多样化的需求，又便于工艺加工。
本公开设计了在工厂内实现区域化的方案，来料是一体的，且工艺稳定，其稳定性可以持续到贴合盖板之后。进行后续金属件贴附时可以直接换膜，实现区域化支撑膜，同时减薄了整体厚度。本公开的实施例还提供一种OLED显示结构，由上述方法制备而成。本公开的实施例提供的OLED显示结构包括本文所述的支撑膜。本公开的实施例提供的OLED显示结构可以应用于全面屏设计、折叠屏设计及相关曲面设计等。
以上描述仅为本公开的实施例以及对所运用技术原理的说明。本领域技术人员应当理解，本公开的范围不限于上述技术特征的特定组合而成的技术方案，同时也应涵盖在不脱离所述公开范围的情况下，由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本公开中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。

Claims (14)

  1. 一种支撑膜，包括叠层设置的第一胶材层、第一基材层、以及在所述第一基材层与所述第一胶材层之间的第一离型膜。
  2. 根据权利要求1所述的支撑膜，其中，所述第一离型膜的材料为硅油；
    所述第一胶材层的材料是丙烯酸树脂；
    所述第一基材层的材料是聚对苯二甲酸乙二醇酯。
  3. 根据权利要求1或2所述的支撑膜，还包括位于所述第一胶材层的远离所述第一基材层的一侧的保护基材层，和位于所述第一基材层远离所述第一胶材层的一侧的保护膜。
  4. 根据权利要求3所述的支撑膜，还包括在所述保护基材层与所述第一胶材层之间的第二离型膜，
    其中，所述第二离型膜的材料为硅油；
    所述保护基材层的材料为聚对苯二甲酸乙二醇酯或聚酰亚胺。
  5. 根据权利要求1至4中任一项所述的支撑膜，还包括贯穿所述第一基材层、所述第一离型膜、所述第一胶材层的开口。
  6. 根据权利要求1至5中任一项所述的支撑膜，其中，所述第一基材层厚度为25μm至100μm。
  7. 根据权利要求6所述的支撑膜，其中，所述第一基材层厚度为50μm。
  8. 一种OLED显示结构制备方法，其包括步骤：
    提供根据权利要求1至7中任一项所述的支撑膜；
    将所述支撑膜贴附到OLED显示器件层，其中，所述OLED显示器件层包括显示区域和弯折区域；
    撕除第一基材层的与所述显示区域对应的一部分；
    在所述第一基材层被撕除的位置贴附第二基材层，其中，所述第二基材层与所述第一基材层材质不相同。
  9. 根据权利要求8所述的OLED显示结构制备方法，其中，在撕除所述支撑膜上与所述显示区域位置对应的第一基材层之前，所述OLED显示结构制备方法还包括：对所述支撑膜的所述第一基材层进行切割，以将所述第一基材层切割成：与所述显示区域和与所述弯折区域的一部分对应的第一部分、和与所述弯折区域的剩余部分对应的第二部分；
    撕除第一基材层的与所述显示区域对应的一部分的同时，还撕除第一基材层的与所述弯折区域对应的部分；
    其中，在所述第一基材层被撕除的位置贴附第二基材层包括贴附所述第二基材层使得其与所述第一基材层的所述第二部分间隔开一定距离。
  10. 根据权利要求8或9所述的OLED显示结构制备方法，其中，所述第一胶材层远离所述第一基材层的一侧设置有保护基材层，所述第一基材层远离所述第一胶材层的一侧设置有保护膜，
    在将所述支撑膜贴附到OLED显示器件层之前，所述OLED显示结构制备方法还包括撕除所述保护基材层；
    在撕除第一基材层的与所述显示区域对应的一部分之前，所述OLED显示结构制备方法还包括撕除所述保护膜。
  11. 根据权利要求8至10中任一项所述的OLED显示结构制备方法，其中，
    所述OLED显示器件层包括依次设置的功能膜层、第一光学粘合剂层和窗膜层，所述功能膜层、所述第一光学粘合剂层和所述窗膜层 在所述显示区域中。
  12. 根据权利要求8至11中任一项所述的OLED显示结构制备方法，其中，在所述第一基材层被撕除的位置贴附第二基材层之后所述OLED显示结构制备方法还包括步骤：
    在所述第二基材层远离所述OLED显示器件层的一侧贴附散热件，在所述散热件远离所述OLED显示器件层的一侧贴附双面胶层，
    撕除所述第一基材层的剩余部分，
    将所述OLED显示器件层的弯折区域进行弯折，其中，所述第一胶材层与所述双面胶层粘贴在一起；
    其中，弯折的所述OLED显示器件层外侧还贴附有第二胶材层。
  13. 根据权利要求8至12中任一项所述的OLED显示结构制备方法，其中，所述第一基材层的材料为聚对苯二甲酸乙二醇酯，所述第二基材层的材料为金属或者高分子。
  14. 一种OLED显示结构，其包括根据权利要求1至7中任一项所述的支撑膜。
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