WO2021003876A1 - 光学胶、显示面板及光学胶的制作方法 - Google Patents

光学胶、显示面板及光学胶的制作方法 Download PDF

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Publication number
WO2021003876A1
WO2021003876A1 PCT/CN2019/111803 CN2019111803W WO2021003876A1 WO 2021003876 A1 WO2021003876 A1 WO 2021003876A1 CN 2019111803 W CN2019111803 W CN 2019111803W WO 2021003876 A1 WO2021003876 A1 WO 2021003876A1
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WIPO (PCT)
Prior art keywords
layer
optical adhesive
release film
polyurethane resin
oca optical
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PCT/CN2019/111803
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English (en)
French (fr)
Inventor
何春梅
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武汉华星光电半导体显示技术有限公司
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Priority to US16/630,449 priority Critical patent/US20210009860A1/en
Publication of WO2021003876A1 publication Critical patent/WO2021003876A1/zh

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/045—Presence of homo or copolymers of ethene in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/105—Presence of homo or copolymers of propene in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/005—Presence of polyester in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane

Definitions

  • the invention relates to the field of display, in particular to a manufacturing method of optical glue, display panel and optical glue.
  • OLED Organic Light Emitting Diode
  • cover film mostly use transparent polyimide (PI) film coated with hard coat (hard coating). This material still obeys the law of high hardness and low bending performance.
  • OCA optical adhesive
  • the existing OCA is a very soft material with a modulus of only about 40Kpa.
  • the thickness and rigidity of the material are much smaller than that of glass because the cover film needs to be bent.
  • the cover film has a monomer hardness of 6H, which can be drawn with a 7H pencil.
  • the surface of the cover film sometimes leaves scratches and indentations on the surface. In this case, the surface of the cover film is damaged and it is difficult to recover.
  • a 6H pencil is used to scratch the cover film, the scratches and indentations are left because: the cover film is too rigid Low; OCA is too soft to cause indentation. Scratches are a manifestation of damage to the surface of the cover film, which can only be improved by increasing the hardness of the cover film.
  • the main reason for the indentation is that the OCA is too soft. If the indentation can be quickly restored, It can be judged that the hardness is 6H.
  • the purpose of the present invention is to provide a manufacturing method of optical glue, display panel and optical glue, which can ensure that when the optical glue is deformed by an external force to produce indentation, it can quickly restore to its original state, and the recovery of the indentation can be quickly improved, so as to improve The surface hardness of the display panel.
  • one embodiment of the present invention provides an optical adhesive, which includes an OCA optical adhesive layer and a polyurethane resin layer that are laminated.
  • the polyurethane resin layer is located on the OCA optical adhesive layer; wherein the polyurethane resin layer and the OCA optical adhesive layer are fused with each other.
  • the material of the OCA optical adhesive layer includes thermosetting OCA optical adhesive and/or ultraviolet curing OCA optical adhesive.
  • the thickness of the polyurethane resin layer is less than the thickness of the OCA optical adhesive layer.
  • the thickness of the polyurethane resin layer is less than 5 ⁇ m.
  • One embodiment of the present invention provides a method for manufacturing the above-mentioned optical glue, which includes the steps:
  • a polyurethane resin layer is prepared, polyurethane is coated on the OCA optical adhesive layer, and foamed, and the foamed polyurethane is fused with the OCA optical adhesive layer on the contact surface to form the polyurethane resin layer.
  • a pre-curing step is further included, which is pre-curing the OCA optical adhesive layer by heating or ultraviolet irradiation.
  • a curing step is further included, which is to cure the polyurethane resin layer by heating or ultraviolet irradiation.
  • the lower release film is any one of PET release film, PE release film, OPP release film, BOPET release film and BOPP release film.
  • a display panel which includes a backplane layer, a display layer, a touch control layer, a polarizer layer, and a flexible cover plate that are stacked.
  • the optical glue is provided between the backplane layer and the display layer; and/or between the display layer and the touch layer; and/or, the touch layer and the polarizer Between the sheet layers; and/or, between the polarizer layer and the flexible cover plate.
  • the flexible cover plate includes a base material of the flexible cover plate and a hard coating layer on the base material of the flexible cover plate; the base material of the flexible cover plate is located on the polarizer layer.
  • the beneficial effect of the present invention is to provide an optical glue, a display panel, and a manufacturing method of the optical glue, which can ensure that the optical glue can quickly restore the original shape when the indentation is generated by the deformation of the external force, thereby improving the display The surface hardness of the panel.
  • FIG. 1 is a schematic diagram of the structure of an optical glue in an embodiment of the present invention
  • Figure 2 is a flow chart of the production of an optical glue in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a display panel structure in which the optical glue is disposed between the backplane layer and the display layer in an embodiment of the present invention
  • FIG. 4 is a structural diagram of a display panel in which the optical glue is disposed between the display layer, the touch layer and the polarizer layer in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of the structure of the optical adhesive disposed between the layers of the display panel in an embodiment of the present invention.
  • OCA optical adhesive layer 2. Polyurethane resin layer, 3. Lower release film, 4. Upper release film,
  • Optical glue 20, backplane layer, 30, display layer, 40, touch layer, 50, polarizer layer,
  • the "above” or “below” of the first feature of the second feature may include the first and second features in direct contact, or may include the first and second features Not in direct contact but through other features between them.
  • “above”, “above” and “above” the second feature of the first feature include the first feature being directly above and obliquely above the second feature, or it simply means that the level of the first feature is higher than the second feature.
  • the “below”, “below” and “below” the first feature of the second feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
  • the invention also provides an optical glue including OCA (Optically Clear Adhesive, optically transparent adhesive) optical adhesive layer; and a polyurethane resin layer located on the OCA optical adhesive layer; wherein the polyurethane resin layer and the OCA optical adhesive layer are fused with each other.
  • OCA Optically Clear Adhesive, optically transparent adhesive
  • the material of the OCA optical adhesive layer includes a thermosetting OCA optical adhesive and/or an ultraviolet curing OCA optical adhesive.
  • the thickness of the polyurethane resin layer is less than the thickness of the OCA optical adhesive layer.
  • the thickness of the polyurethane resin layer is less than 5 ⁇ m.
  • an optical adhesive 10 which includes an OCA optical adhesive layer 1 and a polyurethane resin layer 2 that are laminated.
  • the optical adhesive 10 is located on the lower release film 3 that functions as a carrier.
  • the OCA optical adhesive layer 1 is located on the lower release film 3; the polyurethane resin layer 2 is located on the OCA optical The adhesive layer 1; wherein, the polyurethane resin layer 2 and the OCA optical adhesive layer 1 are fused with each other.
  • the polyurethane resin layer 2 may also include an upper release film 4 for protection.
  • the upper release film 4 and the lower release film 3 need to be torn off.
  • the upper release film 4 and the lower release film 3 use any of PET release film, PE release film, OPP release film, BOPET release film and BOPP release film One kind.
  • the thickness of the upper release film 4 and the lower release film 3 are both 40-60 ⁇ m, preferably 50 ⁇ m, and the upper release film 4 and the lower release film 3 have a peeling force of 5-12 g.
  • the release film does not easily separate the outermost layer, which can better protect the optical glue 10.
  • the material of the OCA optical adhesive layer 1 includes thermosetting OCA optical adhesive and/or ultraviolet curing OCA optical adhesive.
  • the thickness of the polyurethane resin layer 2 is smaller than the thickness of the OCA optical adhesive layer 1.
  • the thickness of the polyurethane resin layer 2 is less than 5 ⁇ m. Since the main purpose of adding polyurethane is to quickly recover from deformation, the thickness of the polyurethane does not need to be too thick, and the indentation depth of the pencil is less than 5 ⁇ m, and the thickness of the polyurethane is limited to less than 5 ⁇ m to ensure the bending characteristics.
  • the present invention also provides a manufacturing method of the optical glue, including the following steps:
  • a polyurethane resin layer is prepared, polyurethane is coated on the OCA optical adhesive layer, and foamed, and the foamed polyurethane is fused with the OCA optical adhesive layer on the contact surface to form the polyurethane resin layer.
  • a pre-curing step is further included between the step of making the OCA optical adhesive layer and the step of making the polyurethane resin layer, in which the OCA optical adhesive layer is pre-cured by heating or ultraviolet irradiation.
  • a curing step is further included, in which the polyurethane resin layer is cured by heating or ultraviolet irradiation.
  • the lower release film includes any one of a PET release film, a PE release film, an OPP release film, a BOPET release film and a BOPP release film.
  • the manufacturing method of the optical glue 10 of the present invention includes the steps:
  • the polyurethane resin layer 2 may also include an upper release film 4 for protection.
  • Both the upper release film 4 and the lower release film 3 include any one of a PET release film, a PE release film, an OPP release film, a BOPET release film, and a BOPP release film.
  • the thickness of the upper release film 4 and the lower release film 3 are both 40-60 ⁇ m, preferably 50 ⁇ m, and the upper release film 4 and the lower release film 3 have a peeling force of 5-12 g.
  • the release film does not easily separate the outermost layer, which can better protect the optical glue 10.
  • step of making the OCA optical adhesive layer 1 and the step of making the polyurethane resin layer 2 further includes:
  • Setting the pre-curing step can reduce production time and effectively improve work efficiency.
  • the method further includes:
  • the present invention provides a display panel, including a backplane layer, a display layer, a touch layer, a polarizer layer and a flexible cover that are stacked; the optical glue is disposed between the backplane layer and the display layer And/or between the display layer and the touch layer; and/or between the touch layer and the polarizer layer; and/or between the polarizer layer and the flexible cover.
  • the flexible cover plate includes a base material of the flexible cover plate and a hard coating layer on the base material of the flexible cover plate; the base material of the flexible cover plate is located on the polarizer layer. It should be noted that any optically transparent material can be used as the base material of the flexible cover.
  • the present invention provides a display panel 100, which includes a backplane layer 20, a display layer 30, a touch layer 40, a polarizer layer 50, and a flexible cover plate 60 that are stacked.
  • the flexible cover 60 includes a substrate 61 of the flexible cover and a hard coat layer 62 on the substrate 61 of the flexible cover; the substrate 61 of the flexible cover is located on the polarizer layer 50 .
  • the optical glue 10 is arranged between a part of the layer structure of the display panel 100, and the existing optical glue 70 is arranged between another part of the layer structure.
  • the optical glue 10 of the present invention is provided between the backplane layer 20 and the display layer 30, and the remaining layers of the display panel 100 can be connected by the existing OCA optical glue 70.
  • the optical glue 10 of the present invention is disposed between the display layer 30, the touch layer 40, and the polarizer layer 50, and the present invention passes between the remaining layers of the display panel 100.
  • OCA optical glue 70 for connection.
  • the optical glue 10 of the present invention can also be arranged between the layers of the display panel 100.
  • the optical glue 10 can be provided between any two adjacent layers, and the optical glue 10 can be provided between at least one adjacent two layers; The optical glue 10 is provided between the two layers.
  • the beneficial effect of the present invention is to provide an optical glue, a display panel, and a manufacturing method of the optical glue, which can ensure that the optical glue can quickly restore the original shape when the indentation is generated by the deformation of the external force, thereby improving the display The surface hardness of the panel.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Polarising Elements (AREA)

Abstract

一种光学胶、显示面板及光学胶的制作方法。光学胶包括层叠设置的OCA光学胶层和聚氨酯树脂层，所述聚氨酯树脂层与所述OCA光学胶层相互融合。制作方法包括步骤：提供一下离型膜、制作OCA光学胶层和制作聚氨酯树脂层。显示面板包括层叠设置的背板层、显示层、触控层、偏光片层和柔性盖板；其中所述光学胶设于所述背板层与所述显示层之间；和/或，所述显示层与所述触控层之间；和/或，所述触控层与所述偏光片层间；和/或，所述偏光片层与所述柔性盖板间。

Description

光学胶、显示面板及光学胶的制作方法 技术领域
本发明涉及显示领域，尤其涉及一种光学胶、显示面板及光学胶的制作方法。
 背景技术
有机电致发光二极管(Organic Light Emitting Diode，OLED)又称有机电致发光显示器、有机发光半导体。因其具有自发光、无穷高对比度、宽视角、低功耗、响应速度极快、可实现柔性显示等特性，自从发现之后就被视为新一代显示技术。
随着聚酰亚胺(Polyimide，简称PI)基板的OLED诞生之后，市场对显示行业进入柔性的需求越来越高，例如折叠手机，既然要折叠，用到的材料就既要柔软可弯折，又要保持一定的硬度、传统的盖板玻璃是无法满足此特性，目前市场的覆盖膜（cover film）大部分采用透明聚酰亚胺（PI）薄膜上涂布硬敷层（hard coating）。此材料仍然遵守高硬度低弯折性能这一规律。但是即使覆盖膜的硬度到达9H以上，但是因为OLED模组显示面板结构中光学胶（OCA，也称光学透明粘合剂）的变形导致OLED模组显示面板的硬度降低。
现有的OCA属于非常软的材料，模量只有40Kpa左右，而覆盖膜因为要满足弯折，材料的厚度和刚度都比玻璃小很多，例如覆盖膜单体硬度6H，用7H的铅笔划过覆盖膜表面时而在表面留下划痕和压痕，这种情况是覆盖膜表面被破坏很难恢复，当使用6H的铅笔划过覆盖膜留下划痕和压痕是因为：覆盖膜刚度太低；OCA太软产生压痕，划痕是覆盖膜表面损坏的一种表现，只能通过提高覆盖膜的硬度来改善，但是压痕主要原因是OCA太软，如果压痕可以快速恢复的话，可判定硬度在6H。
因此，如何保证OCA在受外力作用变形时可以快速恢复原状，成为亟待解决的技术问题。
 技术问题
本发明的目的在于，提供一种光学胶、显示面板及光学胶的制作方法，可保证光学胶在受外力作用变形产生压痕时，可以快速恢复原状，快速提升压痕的恢复，从而能够提升显示面板的表面硬度。
 技术解决方案
为了解决上述问题，本发明其中一实施例中提供一种光学胶，包括层叠设置的OCA光学胶层和聚氨酯树脂层。具体地讲，所述聚氨酯树脂层位于所述OCA光学胶层上；其中，所述聚氨酯树脂层与所述OCA光学胶层相互融合。
进一步的，所述OCA光学胶层的材料包括热固型OCA光学胶，和/或紫外固化型OCA光学胶。
进一步的，所述聚氨酯树脂层的厚度小于所述OCA光学胶层的厚度。
进一步的，所述聚氨酯树脂层的厚度小于5μm。
本发明其中一实施例中提供一种上述光学胶的制作方法，包括步骤：
提供一下离型膜；
制作OCA光学胶层，在所述下离型膜上涂布所述OCA光学胶层；
制作聚氨酯树脂层，在所述OCA光学胶层上涂布聚氨酯，进行发泡，发泡之后的聚氨酯与所述OCA光学胶层在接触面进行融合，形成所述聚氨酯树脂层。
进一步的，在所述制作OCA光学胶层的步骤和所述制作聚氨酯树脂层的步骤之间还包括预固化步骤，其为将所述OCA光学胶层通过加热或紫外线照射方式进行预固化。
进一步的，在所述制作聚氨酯树脂层步骤后还包括固化步骤，其为将所述聚氨酯树脂层通过加热或紫外线照射方式进行固化。
进一步的，所述下离型膜为PET离型膜、PE离型膜、OPP离型膜、BOPET离型膜和BOPP离型膜中的任意一种。
本发明其中一实施例中提供一种显示面板，包括层叠设置的背板层、显示层、触控层、偏光片层和柔性盖板。其中所述光学胶设于所述背板层与所述显示层之间；和/或，所述显示层与所述触控层之间；和/或，所述触控层与所述偏光片层间；和/或，所述偏光片层与所述柔性盖板间。
进一步的，所述柔性盖板包括柔性盖板的基材和位于所述柔性盖板的基材上的硬涂层；所述柔性盖板的基材位于所述偏光片层上。
 有益效果
本发明的有益效果在于，提供一种光学胶、显示面板及光学胶的制作方法，可保证光学胶在受外力作用变形产生压痕时可以快速恢复原状快速提升压痕的恢复，从而能够提升显示面板的表面硬度。
 附图说明
图1为本发明一实施例中一种光学胶的结构示意图；
图2为本发明一实施例中一种光学胶的制作流程图；
图3为本发明一实施例中所述光学胶设于所述背板层与所述显示层之间的显示面板结构示意图；
图4为本发明一实施例中所述光学胶设于设于所述显示层、所述触控层及所述偏光片层间的显示面板结构示意图；
图5为本发明一实施例中所述光学胶设于所述显示面板的各层之间的结构示意图。
图中部件标识如下：
1、OCA光学胶层，2、聚氨酯树脂层，3、下离型膜，4、上离型膜，
10、光学胶，20、背板层，30、显示层，40、触控层，50、偏光片层，
60、柔性盖板，61、柔性盖板的基材，62、硬涂层，70、现有OCA光学胶，
100、显示面板。
 本发明的实施方式
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本发明中，相同或相对应的部件用相同的附图标记表示而与图号无关，在说明书全文中，当“第一”、“第二”等措辞可用于描述各种部件时，这些部件不必限于以上措辞。以上措辞仅用于将一个部件与另一部件区分开。
本发明还提供一种光学胶包括OCA（Optically Clear Adhesive，光学透明粘合剂）光学胶层；以及聚氨酯树脂层，位于所述OCA光学胶层上；其中，所述聚氨酯树脂层与所述OCA光学胶层相互融合。
优选的，所述OCA光学胶层的材料包括热固型OCA光学胶，和/或紫外固化型OCA光学胶。
优选的，所述聚氨酯树脂层的厚度小于所述OCA光学胶层的厚度。
优选的，所述聚氨酯树脂层的厚度小于5μm。
在具体实施时，请参阅图1所示，本发明其中一实施例中提供一种光学胶10，包括层叠设置的OCA光学胶层1和聚氨酯树脂层2。通常所述光学胶10位于起载体作用的下离型膜3上，具体地讲，所述OCA光学胶层1位于所述下离型膜3上；所述聚氨酯树脂层2位于所述OCA光学胶层1上；其中，所述聚氨酯树脂层2与所述OCA光学胶层1相互融合。当然，在所述聚氨酯树脂层2上还可以包括起保护作用的上离型膜4。
值得注意的是，在使用所述光学胶10时，需要将所述上离型膜4和所述下离型膜3撕除。
在本实施例中，所述上离型膜4、所述下离型膜3均采用PET离型膜、PE离型膜、OPP离型膜、BOPET离型膜和BOPP离型膜中的任意一种。所述上离型膜4、所述下离型膜3的厚度均为40~60μm，优选50μm，所述上离型膜4、所述下离型膜3采用剥离力均在5~12g的离型膜，最外层不会轻易分离，可以更好地保护所述光学胶10。
在本实施例中，所述OCA光学胶层1的材料包括热固型OCA光学胶，和/或紫外固化型OCA光学胶。
在本实施例中，所述聚氨酯树脂层2的厚度小于所述OCA光学胶层1的厚度。
在本实施例中，所述聚氨酯树脂层2的厚度小于5μm。由于加入聚氨酯的主要目的让变形为快速恢复，所以聚氨酯的厚度无需太厚，且铅笔的压痕深度议案均小于5μm，固限制聚氨酯的厚度为小于5μm，即可保证弯折特性。
本发明还提供一种所述光学胶的制作方法，包括以下步骤：
提供一下离型膜；
制作OCA光学胶层，在所述下离型膜上涂布所述OCA光学胶层；
制作聚氨酯树脂层，在所述OCA光学胶层上涂布聚氨酯，进行发泡，发泡之后的聚氨酯与所述OCA光学胶层在接触面进行融合，形成所述聚氨酯树脂层。
优选的，在所述制作OCA光学胶层的步骤和所述制作聚氨酯树脂层的步骤之间还包括预固化步骤，将所述OCA光学胶层通过加热或紫外线照射方式进行预固化。
优选的，在所述制作聚氨酯树脂层步骤后还包括固化步骤，将所述聚氨酯树脂层通过加热或紫外线照射方式进行固化。
优选的，所述下离型膜包括PET离型膜、PE离型膜、OPP离型膜、BOPET离型膜和BOPP离型膜中的任意一种。
在具体实施时，请参阅图1、图2所示，本发明光学胶10的制作方法，包括步骤：
S10、提供一下离型膜3；
S20、制作OCA光学胶层1，在所述下离型膜3上涂布所述OCA光学胶层1；
S30、制作聚氨酯树脂层2，在所述OCA光学胶层1上涂布聚氨酯，进行发泡，发泡之后的聚氨酯与所述OCA光学胶层1在接触面进行融合，形成所述聚氨酯树脂层2。实际上经过此步骤，所述聚氨酯能够掺入所述OCA光学胶层1中，从而保证光学胶10在受外力作用变形时可以快速恢复原状。
其中，在所述聚氨酯树脂层2上还可以包括起保护作用的上离型膜4。所述上离型膜4、所述下离型膜3均包括PET离型膜、PE离型膜、OPP离型膜、BOPET离型膜和BOPP离型膜中的任意一种。所述上离型膜4、所述下离型膜3的厚度均为40~60μm，优选50μm，所述上离型膜4、所述下离型膜3采用剥离力均在5~12g的离型膜，最外层不会轻易分离，可以更好地保护所述光学胶10。
请参阅图2所示，在本实施例中，在所述制作OCA光学胶层1步骤和所述制作聚氨酯树脂层2步骤之间还包括：
S21、预固化步骤，将所述OCA光学胶层1通过加热或紫外线照射方式进行预固化。
设置预固化步骤可减少制作时间，有效提高工作效率。
请参阅图2所示，在本实施例中，在所述制作聚氨酯树脂层2步骤后还包括：
S31、固化步骤，将所述聚氨酯树脂层2通过加热或紫外线照射方式进行固化。
本发明提供一种显示面板，包括层叠设置的背板层、显示层、触控层、偏光片层和柔性盖板；所述的光学胶设于所述背板层与所述显示层之间；和/或所述显示层与所述触控层之间；和/或所述触控层与所述偏光片层间；和/或所述偏光片层与所述柔性盖板间。
优选的，所述柔性盖板包括柔性盖板的基材和位于所述柔性盖板的基材上的硬涂层；所述柔性盖板的基材位于所述偏光片层上。应当注意的是，只要是光学透明的材料均可做为所述柔性盖板的基材。
在具体实施时，本发明提供一种显示面板100，包括层叠设置的背板层20、显示层30、触控层40、偏光片层50和柔性盖板60。其中所述柔性盖板60包括柔性盖板的基材61和位于所述柔性盖板的基材61上的硬涂层62；所述柔性盖板的基材61位于所述偏光片层50上。
详细的实施例描述如下：
请参阅图3所示，在显示面板100的一部分层结构之间设置所述光学胶10，而另一部分层结构之间设置现有光学胶70。详细地讲，在所述背板层20与所述显示层30之间设置本发明光学胶10，而在所述显示面板100其余各层之间可通过现有OCA光学胶70进行连接。
请参阅图4所示，在所述显示层30、所述触控层40及所述偏光片层50间设置本发明光学胶10，而在所述显示面板100的其余各层之间通过现有OCA光学胶70进行连接。
请参阅图5所示，本发明光学胶10还可以设于所述显示面板100的各层之间。
由此可知，在所述显示面板100中，任意相邻的两层之间可设有所述光学胶10且至少一相邻的两层之间设有所述光学胶10；以及任意相邻的两层之间均设有所述光学胶10。以上情形的实施例均属于本发明保护范围，在此不一一列举。
本发明的有益效果在于，提供一种光学胶、显示面板及光学胶的制作方法，可保证光学胶在受外力作用变形产生压痕时可以快速恢复原状快速提升压痕的恢复，从而能够提升显示面板的表面硬度。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (10)

  1. 一种光学胶，其包括
    OCA光学胶层；以及
    聚氨酯树脂层，位于所述OCA光学胶层上；
    其中，所述聚氨酯树脂层与所述OCA光学胶层相互融合。
  2. 根据权利要求1所述的光学胶，其中，所述OCA光学胶层的材料包括热固型OCA光学胶，和/或紫外固化型OCA光学胶。
  3. 根据权利要求1所述的光学胶，其中，所述聚氨酯树脂层的厚度小于所述OCA光学胶层的厚度。
  4. 根据权利要求1所述的光学胶，其中，所述聚氨酯树脂层的厚度小于5μm。
  5. 一种权利要求1所述光学胶的制作方法，其包括步骤：
    提供一下离型膜；
    制作OCA光学胶层，在所述下离型膜上涂布所述OCA光学胶层；
    制作聚氨酯树脂层，在所述OCA光学胶层上涂布聚氨酯，进行发泡，发泡之后的聚氨酯与所述OCA光学胶层在接触面进行融合，形成所述聚氨酯树脂层。
  6. 根据权利要求5所述的光学胶的制作方法，其中，在所述制作OCA光学胶层的步骤和所述制作聚氨酯树脂层的步骤之间还包括
    预固化步骤，将所述OCA光学胶层通过加热或紫外线照射方式进行预固化。
  7. 据权利要求5所述的光学胶的制作方法，其中，在所述制作聚氨酯树脂层步骤后还包括
    固化步骤，将所述聚氨酯树脂层通过加热或紫外线照射方式进行固化。
  8. 根据权利要求6所述的光学胶的制作方法，其中，所述下离型膜为PET离型膜、PE离型膜、OPP离型膜、BOPET离型膜和BOPP离型膜中的任意一种。
  9. 一种显示面板，包括层叠设置的背板层、显示层、触控层、偏光片层和柔性盖板；其中，权利要求1所述的光学胶设于
    所述背板层与所述显示层之间；和/或，
    所述显示层与所述触控层之间；和/或，
    所述触控层与所述偏光片层间；和/或，
    所述偏光片层与所述柔性盖板间。
  10. 根据权利要求9所述的显示面板，其中，所述柔性盖板包括柔性盖板的基材和位于所述柔性盖板的基材上的硬涂层；所述柔性盖板的基材位于所述偏光片层上。
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