WO2021082473A1 - 柔性显示屏的制作方法及待剥离临时基板的柔性显示屏 - Google Patents

柔性显示屏的制作方法及待剥离临时基板的柔性显示屏 Download PDF

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Publication number
WO2021082473A1
WO2021082473A1 PCT/CN2020/097185 CN2020097185W WO2021082473A1 WO 2021082473 A1 WO2021082473 A1 WO 2021082473A1 CN 2020097185 W CN2020097185 W CN 2020097185W WO 2021082473 A1 WO2021082473 A1 WO 2021082473A1
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layer
display screen
flexible
substrate
flexible display
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PCT/CN2020/097185
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English (en)
French (fr)
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卢强
杜凌霄
王明玺
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云谷（固安）科技有限公司
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Publication of WO2021082473A1 publication Critical patent/WO2021082473A1/zh

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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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary substrates

Definitions

  • This application relates to the field of display technology, and in particular to a method for manufacturing a flexible display screen and a flexible display screen with a temporary substrate to be peeled off.
  • PI polyimide
  • BPF Back Protect Film
  • PSA pressure sensitive adhesive
  • the flexible display screen needs a small screen thickness in order to achieve the function of folding and curling, if the screen body is too thick, stress concentration will occur when the screen body is folded or curled, which will lead to the problem of display failure.
  • the overall thickness of the back protective film and the optical glue in the display screen is generally about 100 ⁇ m, which leads to a large thickness of the entire flexible display screen, which is prone to display failure.
  • the embodiments of the present application provide a manufacturing method of a flexible display screen and a flexible display screen with a temporary substrate to be peeled off, so as to solve the problem that the existing flexible display screen is prone to display failure.
  • an embodiment of the present application provides a manufacturing method of a flexible display screen, and the manufacturing method includes:
  • the supporting film layer including at least one hardened coating layer
  • the sacrificial layer is removed, and the temporary substrate is separated.
  • the sacrificial layer, the supporting film layer and the flexible substrate are sequentially laminated and coated on the temporary substrate, and the hard coating in the supporting film layer is arranged between the sacrificial layer and the flexible substrate It is bonded to the flexible substrate.
  • the supporting film layer can directly support and protect the flexible substrate without gluing. Compared with the existing temporary substrate, optical glue is needed.
  • the manufacturing method of the flexible display screen provided by this embodiment reduces the thickness of the flexible display screen, reduces or avoids the stress concentration caused by the folding or curling of the flexible display screen. Shows the possibility of failure.
  • an embodiment of the present application also provides a flexible display screen with a temporary substrate to be peeled off, which includes a temporary substrate, a sacrificial layer, a supporting film layer, a flexible substrate, and a light-emitting layer that are stacked in sequence, and the supporting film layer at least includes A hardened coating.
  • the flexible display screen of the temporary substrate to be peeled off includes a light-emitting layer, a flexible substrate, and a supporting film layer with a hardened coating, where the hardened coating replaces the use of optical glue to bond the back protective film to support the flexible Substrate method, the hardened coating can not only support the flexible substrate and the various film layers above it, but also the thickness of the hardened coating is less than the thickness of the optical glue and the back protective film, thereby reducing the overall thickness of the flexible display screen, reducing or avoiding The flexible display screen is prone to stress concentration when folded or rolled, leading to the possibility of display failure.
  • the hardened coating has an anti-scratch effect. When the temporary substrate is peeled off, the hardened coating can protect the flexible substrate and prevent the flexible substrate from being damaged. Scratched.
  • FIG. 1 is a flowchart of a manufacturing method of a flexible display screen provided in Embodiment 1 of the application;
  • FIG. 2 is a schematic structural diagram 1 of a flexible display screen with a temporary substrate to be peeled off according to the second embodiment of the application;
  • FIG. 3 is a second structural schematic diagram of a flexible display screen with a temporary substrate to be peeled off provided in the second embodiment of the application.
  • the existing flexible display screen is provided with a backside protective film and optical glue on a flexible substrate, and the overall thickness is relatively large, and stress concentration is likely to occur when folded or rolled, leading to the problem of display failure.
  • the embodiments of the present application provide an improved technical solution.
  • a sacrificial layer, a supporting film layer and a flexible substrate are sequentially laminated and coated on a temporary substrate to support The hard coating in the film layer is bonded to the flexible substrate.
  • the supporting film layer can directly support and protect the flexible substrate without gluing.
  • optical glue it is necessary to use optical glue to bond the back protective film on the flexible substrate.
  • the manufacturing method of the flexible display provided in this embodiment reduces the thickness of the flexible display, and reduces or prevents the flexible display from being easily folded or rolled. There is a possibility of stress concentration and display failure.
  • the manufacturing method of the flexible display screen provided in the first embodiment of the present application includes:
  • S01 Provide a temporary substrate 50; in this step, the temporary substrate 50 can be set as a glass substrate.
  • S02 forming a sacrificial layer 40 and a supporting film layer sequentially stacked on the temporary substrate 50, and the supporting film layer includes at least one hardened coating layer;
  • the sacrificial layer 40 is coated on the temporary substrate 50, and the supporting film layer is coated on the side of the sacrificial layer 40 away from the temporary substrate 50.
  • the method of coating the sacrificial layer 40 may be vapor deposition or inkjet printing.
  • the method of coating the support film layer may be vapor deposition or inkjet printing.
  • the hardened coating can be provided as one layer or multiple layers. It should be noted that the hard coating in this embodiment is an organic film layer containing inorganic materials such as silicon and nitrogen. Specifically, the hardened coating may be an acrylic resin coating. The thickness of the hardened coating is small. The hardened coating can not only reduce the overall thickness of the flexible display screen, but also can protect the flexible substrate 10 and prevent the flexible substrate. 10 The effect of scratching.
  • the flexible substrate 10 and the light-emitting layer 20 laminated in sequence are formed on the hard coating; on the basis of the above embodiment, the flexible substrate 10 is coated on the hard coating, that is, the flexible substrate 10 is adhered to the hard coating .
  • the hardness of the hardened coating is large.
  • the hardened coating adhered to the bottom of the flexible substrate 10 can support and protect the flexible substrate 10, and there is no need to attach a protective film to the bottom of the flexible substrate 10 .
  • the bottom of the flexible substrate 10 in this embodiment refers to the side of the flexible substrate 10 facing away from the light-emitting surface.
  • S04 The sacrificial layer 40 is removed, and the temporary substrate 50 is separated.
  • the sacrificial layer 40 can be removed by photolithography. Since the temporary substrate 50 is located under the sacrificial layer 40 and connected to the sacrificial layer 40, after the sacrificial layer 40 is removed, the temporary substrate 50 is detached.
  • the sacrificial layer 40, the supporting film layer, and the flexible substrate 10 are sequentially laminated and coated on the temporary substrate 50, and the hardened coating is provided between the sacrificial layer 40 and the flexible substrate 10.
  • the supporting film layer is used to support and protect the flexible substrate 10.
  • the back surface protection film needs to be bonded on the flexible substrate 10 with optical glue. In this way, the manufacturing method of the flexible display screen provided by this embodiment is easy to operate, has high manufacturing efficiency, and reduces the thickness of the flexible display screen, reduces or avoids stress concentration and display failure when the flexible display screen is folded or rolled. possibility.
  • the step of forming the sacrificial layer 40, the supporting film layer, and the flexible substrate 10 sequentially stacked on the temporary substrate 50 includes: sequentially coating the sacrificial layer 40 and a layer of hardened coating.
  • the sacrificial layer 40 is first coated on the temporary substrate 50, and then a hardened coating is coated on the sacrificial layer 40, and the hardened coating is directly coated on the sacrificial layer 40, and the flexible substrate 10 is formed on the side of the hard coating away from the sacrificial layer 40 and connected to the hard coating.
  • the hard coating can support the flexible substrate 10 and each film layer above it, without the need to bond the protective film , And the thickness of the hardened coating is small, which reduces the overall thickness of the flexible display screen.
  • the step of forming the sacrificial layer 40, the supporting film layer, and the flexible substrate 10 sequentially stacked on the temporary substrate 50 includes: sequentially coating the sacrificial layer 40 and the first hard coating layer 31 , The flexible resin layer 60 and the second hardened coating layer 32.
  • the supporting film layer includes two hardened coatings, namely the first hardened coating 31 and the second hardened coating 32.
  • the sacrificial layer 40 formed on the temporary substrate 50 is first coated.
  • the second hard coating layer 32 is applied, and then a flexible intermediate layer can be coated on the second hard coating layer 32, and finally the first hard coating layer 31 can be coated on the flexible intermediate layer.
  • the flexible intermediate layer can be a flexible resin layer 60.
  • the step of removing the sacrificial layer 40 includes: using a laser to lift off the sacrificial layer 40.
  • the method of removing the sacrificial layer 40 in this embodiment is laser lift-off. In addition, it can also be removed by etching.
  • the flexible display screen of the temporary substrate to be peeled off provided in the second embodiment of the present application includes a temporary substrate 50, a sacrificial layer 40, a supporting film layer, a flexible substrate 10, and a light-emitting layer 20 stacked in sequence.
  • the supporting film layer includes at least one layer of hardened coating. Floor.
  • the flexible display screen of the temporary substrate to be peeled off includes a sacrificial layer 40, a flexible substrate 10, and a light-emitting layer 20 stacked on the temporary substrate 50, and the flexible substrate 10 may specifically be polyimide.
  • the substrate can also be a polyurethane substrate or a butylene phthalate substrate; the light-emitting layer 20 is formed on the first surface of the flexible substrate 10, as shown in FIG. One surface is the side of the flexible substrate 10 facing the display surface. The orientation shown in FIG. 2 is taken as an example for description. The first surface is the top surface of the flexible substrate 10.
  • the light-emitting layer 20 in this embodiment includes an AMOLED (Active-matrix organic light-emitting diode; active matrix organic light-emitting diode or active matrix organic light-emitting diode) device.
  • the light-emitting layer 20 is away from the flexible substrate 10 The side of is the display surface.
  • the sacrificial layer 40 may be specifically configured as a flexible polyimide layer, and the temporary substrate 50 may be configured as a rigid substrate.
  • the temporary substrate 50 may be a glass substrate, a silicon substrate, or a metal substrate.
  • the temporary substrate 50 is a glass substrate, which can be recycled and has no pollution to the environment.
  • the sacrificial layer 40 is formed on the temporary substrate 50, and the flexible substrate 10 is formed on the side of the sacrificial layer 40 away from the temporary substrate 50.
  • the temporary substrate 50 and the sacrificial layer 40 are used to temporarily support the flexible substrate 10 and each film layer on the flexible substrate 10.
  • the supporting film layer includes a hardened coating.
  • the hardened coating can be provided as one layer, and the hardened coating can also be provided as multiple layers.
  • the hard coating in this embodiment is an organic film layer containing inorganic materials such as silicon and nitrogen.
  • the hardened coating may be an acrylic resin coating.
  • the thickness of the hardened coating is small. The hardened coating can not only reduce the overall thickness of the flexible display screen, but also can protect the flexible substrate 10 and prevent the flexible substrate. 10 The effect of scratching.
  • the supporting film layer may also include a flexible intermediate layer.
  • the material of the flexible intermediate layer may be the same as the material of the flexible substrate 10, that is, a polyimide layer.
  • the flexible intermediate layer can be provided as one layer or multiple layers. As shown in FIG. 2, when the hardened coating layer is provided as multiple layers, the thickness of each hardened coating layer can be set to 5 ⁇ m-50 ⁇ m, for example, 5 ⁇ m, 10 ⁇ m, or 15 ⁇ m.
  • the multilayer hardened coatings may be sequentially formed and contact each other, and a flexible intermediate layer may also be provided between the multilayer hardened coatings.
  • the multilayer hard coating and the flexible intermediate layer are used to support the hard coating, and the hard coating located in the outermost layer is used to protect the flexible substrate 10 to prevent the flexible substrate 10 from being scratched.
  • the hardened coating can also be provided as one layer. Taking the orientation shown in FIG. 3 as an example for description, the hardened coating is formed on the bottom surface of the flexible substrate 10 in this embodiment. Specifically, the thickness of the hardened coating can be set to 5 ⁇ m. In this embodiment, the hardened coating can play a role in supporting the flexible substrate 10 and at the same time can also play a role in protecting the flexible substrate 10 to prevent the flexible substrate 10 from being scratched.
  • the sacrificial layer 40, the hardened coating layer, and the flexible substrate 10 are sequentially formed on the temporary substrate 50 from bottom to top.
  • the thickness of the sacrificial layer 40 is set to 5 ⁇ m to 20 ⁇ m, and specifically can be set to 8.5 ⁇ m; the hardened coating layer can be set to 5 ⁇ m to 50 ⁇ m.
  • the sacrificial layer 40 can be removed by laser lift-off, so that the temporary substrate 50 is removed.
  • the temporary substrate 40 After the temporary substrate 40 is peeled off, it can be applied to any display device with a display function, such as a mobile phone, a tablet computer, a smart watch, an e-book, a navigator, a TV, a digital camera, and the like.
  • a display device such as a mobile phone, a tablet computer, a smart watch, an e-book, a navigator, a TV, a digital camera, and the like.
  • the flexible display screen with the temporary substrate to be peeled off provided in the second embodiment of the present application is provided with a hardened coating on the side of the flexible substrate 10 away from the light-emitting layer 20, and the hardened coating replaces the use of optical glue to bond the back protective film to support
  • the hardened coating can not only support the flexible substrate 10 and the various film layers above it, but also has a small thickness of the hardened coating, which reduces the overall thickness of the flexible display screen, and reduces or avoids the problem of the flexible display screen. When folded or rolled, stress concentration is likely to occur, leading to the possibility of display failure.
  • the hardened coating has an anti-scratch effect, which can protect the flexible substrate 10 and prevent the flexible substrate 10 from being scratched.
  • the supporting film layer includes a hardened coating.
  • the supporting film layer includes two hardened coating layers.
  • the supporting film layer includes a first hardened coating layer 31 and a second hardened coating layer 32.
  • the flexible display screen provided in this embodiment includes a supporting film layer disposed on the side of the flexible substrate 10 away from the display surface.
  • the supporting film layer in this embodiment includes two hardened coating layers. : The first hard coating layer 31 and the second hard coating layer 32, wherein, described in the orientation shown in FIG.
  • the first hard coating layer 31 is disposed on the bottom surface of the flexible substrate 10, that is, the flexible substrate 10 faces away from the display
  • the second hard coating layer 32 is formed on the bottom surface of the first hard coating layer 31, that is, the side of the first hard coating layer 31 facing away from the display surface.
  • the first hard coating layer 31 and the second hard coating layer 32 can be In direct contact, a flexible intermediate layer can also be provided between the first hard coating layer 31 and the second hard coating layer 32.
  • a flexible intermediate layer is provided between the first hard coating layer 31 and the second hard coating layer 32 , The first hard coating layer 31 and the second hard coating layer 32 are in contact with the flexible intermediate layer, respectively.
  • the thickness of the first hard coating layer 31 and the second hard coating layer 32 may be equal or different.
  • the supporting film layer further includes a flexible resin layer 60, and the flexible resin layer 60 is disposed between the first hard coating layer 31 and the second hard coating layer 32.
  • the supporting film layer in this embodiment includes a first hard coating layer 31 and a second hard coating layer 32, and the flexible intermediate layer is specifically set as a flexible resin layer 60.
  • a sacrificial layer 40 is formed on the temporary substrate 50, and the second hardened coating layer 32 is formed on the top surface of the sacrificial layer 40, that is, the side of the sacrificial layer 40 facing away from the temporary substrate 50.
  • the resin layer 60 is formed on the top surface of the second hard coating layer 32, that is, the side of the second hard coating layer 32 facing away from the temporary substrate 50; the first hard coating layer 31 is formed on the top surface of the flexible resin layer 60, that is, the flexible resin layer 60 is away from the side of the temporary substrate 50.
  • the thickness of the first hard coating layer 31 and the second hard coating layer 32 may be equal.
  • the thickness of the first hard coating layer 31 and the second hard coating layer 32 are both 5 ⁇ m, which are located in the first hard coating layer.
  • the thickness of the flexible resin layer 60 between 31 and the second hardened coating layer 32 may be set to 15 ⁇ m.
  • the three-layer structure composed of the first hard coating layer 31, the flexible resin layer 60 and the second hard coating layer 32 is used to support the flexible substrate 10 on the first hard coating layer 31 and each film layer on the flexible substrate 10,
  • the second hard coating layer 32 can also play a role in preventing the flexible substrate 10 from being scratched.
  • the three-layer structure formed by the first hard coating layer 31, the flexible resin layer 60, and the second hard coating layer 32 in this embodiment has a smaller thickness and does not require optical glue or other adhesives. Bonding reduces the overall thickness of the flexible display screen and avoids the problems of stress concentration and poor display effect caused by excessive thickness.
  • the flexible display screen of the temporary substrate to be peeled off further includes a polarizing layer 70.
  • the polarizing layer 70 is arranged on the side of the light-emitting layer 20 away from the flexible substrate 10, and the polarizing layer 70 and the light-emitting layer 20 are passed through optical glue. 90 bonding.
  • the polarizing layer 70 may be provided as a polyvinyl alcohol layer, and the thickness of the polarizing layer 70 may be 10 ⁇ m to 20 ⁇ m.
  • the polarizing layer 70 can play a role of polarizing light. As shown in FIGS.
  • the polarizing layer 70 is disposed on the side of the light-emitting layer 20 away from the flexible substrate 10, and an adhesive is also disposed between the polarizing layer 70 and the light-emitting layer 20, specifically,
  • the adhesive may be optical glue 90.
  • the flexible display screen of the temporary substrate to be peeled off further includes a cover plate 80.
  • the cover plate 80 is arranged on the side of the polarizing layer 70 away from the light emitting layer 20.
  • the cover plate 80 and the polarizing layer 70 are passed through an optical glue 90. Bonding.
  • the cover plate 80 may be set as a glass cover plate 80, as shown in FIGS. 2 and 3.
  • the cover plate 80 is provided on the side of the polarizing layer 70 away from the flexible substrate 10, and the cover plate 80 is connected to the polarizing layer 70.
  • An adhesive is also arranged between the layers 70, specifically, the adhesive may be an optical glue 90.

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Abstract

一种柔性显示屏的制作方法及待剥离临时基板（50）的柔性显示屏，涉及显示技术领域，其中柔性显示屏的制作方法包括提供临时基板（50）；在临时基板（50）上形成依次层叠的牺牲层（40）和支撑膜层，支撑膜层至少包括一层硬化涂层；在硬化涂层上形成依次层叠的柔性衬底（10）和发光层（20）；去除牺牲层（40），分离临时基板（50）。该方法中将硬化涂层设置在牺牲层（40）与柔性衬底（10）之间的方式替代了剥离临时基板（50）后利用光学胶（90）粘接背面保护膜来支撑柔性衬底（10）的方式，硬化涂层不仅能够支撑柔性衬底（10）及其上方各个膜层，而且硬化涂层厚度较小，从而降低了柔性显示屏整体的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中以致显示失效的可能性。

Description

柔性显示屏的制作方法及待剥离临时基板的柔性显示屏 技术领域
本申请涉及显示技术领域，尤其涉及一种柔性显示屏的制作方法及待剥离临时基板的柔性显示屏。
背景技术
随着显示技术的逐步发展，柔性显示屏受到越来越多用户的欢迎，在柔性显示屏的面板制作工艺中，为了实现折叠和卷曲，利用PI(polyimide)柔性衬底代替了传统硬质显示屏中的临时基板。现有的柔性显示屏为了保护柔性PI衬底，通常会在柔性PI衬底的底部贴合BPF(Back Protect Film，背面保护膜)，即在激光剥离工艺之后，将PI衬底以上的叠层及PI衬底与临时基板分开，然后用光学胶PSA(pressure sensitive adhesive)将背面保护膜粘合在PI衬底的底部。
但是，由于柔性显示屏为了实现折叠、卷曲的功能需要较小的屏体厚度，若屏体太厚会造成屏体在折叠、卷曲时发生应力集中，导致显示失效的问题，而现有的柔性显示屏中背面保护膜和光学胶整体的厚度一般在100μm左右，这就导致了柔性显示屏整体的厚度较大，容易产生显示失效的问题。
发明内容
本申请实施例提供一种柔性显示屏的制作方法及待剥离临时基板的柔性显示屏，以解决现有的柔性显示屏容易产生显示失效的问题。
为了实现上述目的，本申请实施例提供如下技术方案：
一方面，本申请实施例提供了一种柔性显示屏的制作方法，该制作方法包括：
提供临时基板；
在所述临时基板上形成依次层叠的牺牲层和支撑膜层，所述支撑膜层至少包括一层硬化涂层；
在所述硬化涂层上形成依次层叠的柔性衬底和发光层；
去除所述牺牲层，分离所述临时基板。
本实施例提供的柔性显示屏的制作方法中，牺牲层、支撑膜层和柔性衬底依次层叠涂布在临时基板上，支撑膜层中的硬化涂层设置在牺牲层与柔性衬底之间并与柔性衬底粘接，在去除掉牺牲层和临时基板后，支撑膜层能够直接支撑和保护柔性衬底，无需进行胶粘，相较于现有的去除临时基板后还需要利用光学胶在柔性衬底上粘接背面保护膜的方式，本实施例提供的柔性显示屏的制作方法降低了柔性显示屏的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中、导致显示失效的可能性。
另一方面，本申请实施例还提供一种待剥离临时基板的柔性显示屏，包括依次层叠设置的临时基板、牺牲层、支撑膜层、柔性衬底和发光层，所述支撑膜层至少包括一层硬化涂层。
本申请实施例提供的待剥离临时基板的柔性显示屏包括发光层、柔性衬底和具有硬化涂层的支撑膜层，其中硬化涂层的设置替代了利用光学胶粘接背面保护膜来支撑柔性衬底的方式，硬化涂层不仅能够支撑柔性衬底及其上方各个膜层，而且硬化涂层厚度小于光学胶与背面保护膜的厚度，从而降低了柔性显示屏整体的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中、导致显示失效的可能性，此外，硬化涂层具有防划作用，当临时基板剥离后，硬化涂层能够保护柔性衬底，防止柔性衬底被划损。
除了上面所描述的本申请解决的技术问题、构成技术方案的技术特征以及由这些技术方案的技术特征所带来的有益效果外，本申请实施例提供的柔性显示屏的制作方法及待剥离临时基板的柔性显示屏所能够解决的其他技术问题、技术方案中包含的其他技术特征以及这些技术特征带来的有益效果，将在具体实施方式中作出进一步详细的说明。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对本申请实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一部分实施例，这些附图和文字描述并不是为了通过任何方式限制本公开构思的范围，而是通过参考特定实施例为本领域技术人员说明本公开的概念，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为本申请实施例一提供的柔性显示屏的制作方法的流程图；
图2为本申请实施例二提供的待剥离临时基板的柔性显示屏的结构示意图一；
图3为本申请实施例二提供的待剥离临时基板的柔性显示屏的结构示意图二。
具体实施方式
现有的柔性显示屏在柔性衬底上设置有背面保护膜和光学胶，整体厚度较大，在折叠或卷曲时容易产生应力集中，导致显示失效的问题。
针对上述缺陷，本申请实施例提供了一种改进的技术方案，在该技术方案中，柔性显示屏在制作时，牺牲层、支撑膜层和柔性衬底依次层叠涂布在临时基板上，支撑膜层中的硬化涂层与柔性衬底粘接，在去除掉牺牲层和临时基板后，支撑膜层能够直接支撑和保护柔性衬底，无需进行胶粘，相较于现有的去除临时基板后还需要利用光学胶在柔性衬底上粘接背面保护膜方式，本实施例提供的柔性显示屏的制作方法降低了柔性显示屏的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中、导致显示失效的可能性。
为了使本申请实施例的上述目的、特征和优点能够更加明显易懂，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其它实施例，均属于本申请保护的范围。
实施例一
请参阅图1，本申请实施例一提供的柔性显示屏的制作方法包括：
S01：提供临时基板50；本步骤中临时基板50可以设置为玻璃基板。
S02：在临时基板50上形成依次层叠的牺牲层40和支撑膜层，支撑膜层至少包括一层硬化涂层；
本步骤中牺牲层40涂布在临时基板50上，支撑膜层涂布在牺牲层40背离临时基板50的一侧。具体地，涂布牺牲层40的方式可以为蒸镀或喷墨打印的方式，同样的，涂布支撑膜层的方式可以为蒸镀或喷墨打印的方式。本实施例中，硬化涂层可以设置为一层，也可以设置为多层。需要说明的是，本实施例中的硬化涂层为含有如硅、氮等无机材料的有机膜层。硬化涂层具体可以为丙烯酸树脂涂层，硬化涂层的厚度较小，硬化涂层不仅能够起到减小柔性显示屏整体厚度的作用，还能够起到保护柔性衬底10、防止柔性衬底10划损的作用。
S03：在硬化涂层上形成依次层叠的柔性衬底10和发光层20；在上述实施方式的基础上，柔性衬底10涂布在硬化涂层上，即柔性衬底10与硬化涂层粘连。硬化涂层的硬度大，当后续将牺牲层40去除后，粘连在柔性衬底10的底部的硬化涂层能够支撑和保护柔 性衬底10，无需再在柔性衬底10的底部粘接保护膜。本实施例中柔性衬底10的底部指的是柔性衬底10背离出光面的一侧。
S04：去除牺牲层40，分离临时基板50。当需要去除临时基板50时，可以采用光刻等方式去除牺牲层40，由于临时基板50位于牺牲层40下并与牺牲层40相连接，因此当牺牲层40被去除后，临时基板50脱离。
本实施例提供的柔性显示屏的制作方法中，牺牲层40、支撑膜层和柔性衬底10依次层叠涂布在临时基板50上，硬化涂层设置在牺牲层40与柔性衬底10之间，去除掉牺牲层40和临时基板50后，支撑膜层用于支撑和保护柔性衬底10，相较于去除临时基板50后还需要利用光学胶在柔性衬底10上粘接背面保护膜的方式，本实施例提供的柔性显示屏的制作方法操作简便，制作效率高，并且降低了柔性显示屏的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中、导致显示失效的可能性。
进一步地，在一种可能的实现方式中，在临时基板50上形成依次层叠的牺牲层40、支撑膜层和柔性衬底10的步骤包括：依次涂布牺牲层40和一层硬化涂层。具体地，本实施例中先在临时基板50上涂布牺牲层40，然后在牺牲层40上涂布一层硬化涂层，通过将硬化涂层直接涂布在牺牲层40上、柔性衬底10形成在硬化涂层背离牺牲层40的一侧与硬化涂层连接，当后续去除掉牺牲层40后，硬化涂层能够支撑柔性衬底10及其上方各个膜层，无需再粘接保护膜，而且硬化涂层厚度较小，降低了柔性显示屏整体的厚度。
进一步地，在一种可能的实现方式中，在临时基板50上形成依次层叠的牺牲层40、支撑膜层和柔性衬底10的步骤包括：依次涂布牺牲层40、第一硬化涂层31、柔性树脂层60和第二硬化涂层32。本实施例中支撑膜层包括两层硬化涂层，分别为第一硬化涂层31和第二硬化涂层32，在涂布过程中，首先在形成在临时基板50上的牺牲层40上涂布第二硬化涂层32，然后可以在第二硬化涂层32上涂布柔性中间层，最后在柔性中间层上涂布第一硬化涂层31，具体地，柔性中间层可以为柔性树脂层60。
进一步地，在一种可能的实现方式中，在去除牺牲层40的步骤包括：利用激光剥离牺牲层40。本实施例中去除牺牲层40的方式为激光剥离。此外，还可以利用刻蚀方法去除。
实施例二
本申请实施例二提供的待剥离临时基板的柔性显示屏包括依次层叠设置的临时基板50、牺牲层40、支撑膜层、柔性衬底10和发光层20，支撑膜层包括至少一层硬化涂层。
具体地，在本实施例中，待剥离临时基板的柔性显示屏包括层叠设置在临时基板50上的牺牲层40、柔性衬底10和发光层20，柔性衬底10具体可以为聚酰亚胺衬底、还可以为聚氨酯衬底、还可以为苯二甲酸丁二醇酯衬底；发光层20形成在柔性衬底10的第一表面上，如图2所示，柔性衬底10的第一表面为柔性衬底10朝向显示面的一侧，以图2所示的方位为例进行描述，第一表面为柔性衬底10的顶面。本实施例中发光层20包括AMOLED(Active-matrix organic light-emitting diode；有源矩阵有机发光二极体或主动矩阵有机发光二极体)器件，本实施例中发光层20背离柔性衬底10的一侧为显示面。
本实施例中牺牲层40具体可以设置为柔性聚酰亚胺层，临时基板50设置为刚性基板，具体地，临时基板50可以为玻璃基板，也可以为硅基板，还可以为金属基板。优选地，临时基板50选用玻璃基板，玻璃基板能够循环利用，且对环境无污染。本实施例中牺牲层40形成在上述临时基板50上，柔性衬底10形成在牺牲层40背离临时基板50的一侧。本实施例中临时基板50和牺牲层40用于临时支撑柔性衬底10及柔性衬底10上的各个膜层。
本实施例中支撑膜层包括硬化涂层，具体地，硬化涂层可以设置为一层，硬化涂层也可以设置为多层。本实施例中的硬化涂层为含有如硅、氮等无机材料的有机膜层。硬化涂层具体可以为丙烯酸树脂涂层，硬化涂层的厚度较小，硬化涂层不仅能够起到减小柔性显示屏整体厚度的作用，还能够起到保护柔性衬底10、防止柔性衬底10划损的作用。
支撑膜层还可以包括有柔性中间层，具体地，柔性中间层的材料可以与柔性衬底10的材料一致，即为聚酰亚胺层。柔性中间层可以设置为一层，也可以设置为多层。如图2所示，当硬化涂层设置为多层，每层硬化涂层的厚度可以设置为5μm～50μm，例如可以为5μm、10μm、15μm。多层硬化涂层可以依次形成并相接触，多层硬化涂层之间也可以设置有柔性中间层。多层硬化涂层和柔性中间层用于支撑硬化涂层，位于最外层的硬化涂层用于保护柔性衬底10，以防止柔性衬底10被划损。
如图3所示，硬化涂层还可以设置为一层。以图3所示的方位为例进行描述，本实施例中硬化涂层形成在柔性衬底10的底面，具体地，硬化涂层的厚度可以设置为5μm。本实施例中硬化涂层能够起到支撑柔性衬底10的作用，同时还可以起到保护柔性衬底10的作用，以防止柔性衬底10被划损。
在上述实施方式的基础上，牺牲层40、硬化涂层和柔性衬底10依次自下而上形成在临时基板50上。本实施例中牺牲层40的厚度设置为5μm～20μm，具体可以设置为8.5μm；硬化涂层可以设置为5μm～50μm。当需要将临时基板50去除时，可以采用激光剥离的方 式去除牺牲层40，从而将临时基板50去除。在剥离临时基板40后可以应用于手机、平板电脑、智能手表、电子书、导航仪、电视、数码相机等任意具有显示功能的显示设备中。
本申请实施例二提供的待剥离临时基板的柔性显示屏通过在柔性衬底10背离发光层20的一侧设置硬化涂层，硬化涂层的设置替代了利用光学胶粘接背面保护膜来支撑柔性衬底10的方式，硬化涂层不仅能够支撑柔性衬底10及其上方各个膜层，而且硬化涂层厚度较小，从而降低了柔性显示屏整体的厚度，降低或避免了柔性显示屏在折叠或卷曲时容易产生应力集中、导致显示失效的可能性，此外，硬化涂层具有防划作用，能够保护柔性衬底10，防止柔性衬底10被划损。
如图2所示，在一种可能的实现方式中，支撑膜层包括一层硬化涂层。
如图3所示，在另一种可能的实现方式中，支撑膜层包括两层硬化涂层，具体地，支撑膜层包括第一硬化涂层31和第二硬化涂层32。具体地，本实施例提供的柔性显示屏包括设置在柔性衬底10背离显示面一侧的支撑膜层，具体地，如图3所示，本实施例中支撑膜层包括两层硬化涂层：第一硬化涂层31和第二硬化涂层32，其中，以图3所示的方位进行描述，第一硬化涂层31设置在柔性衬底10的底面上，即柔性衬底10背离显示面的一侧；第二硬化涂层32形成在第一硬化涂层31的底面，即第一硬化涂层31背离显示面的一侧，第一硬化涂层31与第二硬化涂层32可以直接接触，也可以在第一硬化涂层31与第二硬化涂层32之间可以设置有柔性中间层，当第一硬化涂层31与第二硬化涂层32之间设置有柔性中间层时，第一硬化涂层31和第二硬化涂层32与柔性中间层分别接触连接。本实施例中，第一硬化涂层31与第二硬化涂层32的厚度可以相等，也可以不相等。
在一种可能的实现方式中，支撑膜层还包括柔性树脂层60，柔性树脂层60设置在第一硬化涂层31与第二硬化涂层32之间。具体地，如图3所示，本实施例中支撑膜层包括第一硬化涂层31和第二硬化涂层32，柔性中间层具体设置为柔性树脂层60。以图3所示的方位为例进行描述，临时基板50上形成有牺牲层40，第二硬化涂层32形成在牺牲层40的顶面，即牺牲层40背离临时基板50的一侧，柔性树脂层60形成在第二硬化涂层32的顶面，即第二硬化涂层32背离临时基板50的一侧；第一硬化涂层31形成在柔性树脂层60的顶面，即柔性树脂层60背离临时基板50的一侧。
本实施例中，第一硬化涂层31和第二硬化涂层32的厚度可以相等，例如，第一硬化涂层31和第二硬化涂层32的厚度均为5μm，位于第一硬化涂层31与第二硬化涂层32之间的柔性树脂层60的厚度可以设置为15μm。第一硬化涂层31、柔性树脂层60和第二硬 化涂层32构成的三层结构用于支撑位于第一硬化涂层31上的柔性衬底10及柔性衬底10上的各个膜层，且第二硬化涂层32还能够起到防止柔性衬底10被划损的作用。相较于的支撑膜构成的支撑结构，本实施例中上述第一硬化涂层31、柔性树脂层60和第二硬化涂层32构成的三层结构厚度较小，且无需光学胶或其他胶粘剂进行粘合，降低了柔性显示屏整体的厚度，避免了因厚度过大而导致的应力集中以及显示效果差的问题。
在一种可能的实现方式中，待剥离临时基板的柔性显示屏还包括偏光层70，偏光层70设置在发光层20背离柔性衬底10的一侧，偏光层70与发光层20通过光学胶90粘接。具体地，偏光层70可以设置为聚乙烯醇层，偏光层70的厚度可以为10μm～20μm。偏光层70能够起到偏光作用。如图2和图3所示，本实施例中偏光层70设置在发光层20背离柔性衬底10的一侧，且偏光层70与发光层20之间还设置有胶黏剂，具体地，胶黏剂可以为光学胶90。
在一种可能的实现方式中，待剥离临时基板的柔性显示屏还包括盖板80，盖板80设置在偏光层70背离发光层20的一侧，盖板80与偏光层70通过光学胶90粘接。具体地，盖板80可以设置为玻璃盖板80，如图2和图3所示，本实施例中盖板80设置在偏光层70背离柔性衬底10的一侧，且盖板80与偏光层70之间还设置有胶黏剂，具体地，胶黏剂可以为光学胶90。
本说明书中各实施例或实施方式采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分相互参见即可。
在本说明书的描述中，参考术语“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合实施方式或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种柔性显示屏的制作方法，所述制作方法包括：
    提供临时基板；
    在所述临时基板上形成依次层叠的牺牲层和支撑膜层，所述支撑膜层至少包括一层硬化涂层；
    在所述硬化涂层上形成依次层叠的柔性衬底和发光层；
    去除所述牺牲层，分离所述临时基板。
  2. 根据权利要求1所述的柔性显示屏的制作方法，其中，所述在所述临时基板上形成依次层叠的牺牲层和支撑膜层的步骤包括：依次涂布牺牲层和一层硬化涂层。
  3. 根据权利要求1所述的柔性显示屏的制作方法，其中，所述在所述临时基板上形成依次层叠的牺牲层和支撑膜层的步骤包括：依次涂布牺牲层、第一硬化涂层、柔性树脂层和第二硬化涂层。
  4. 根据权利要求1所述的柔性显示屏的制作方法，其中，所述去除所述牺牲层的步骤包括：利用激光剥离所述牺牲层。
  5. 一种待剥离临时基板的柔性显示屏，包括依次层叠设置的临时基板、牺牲层、支撑膜层、柔性衬底和发光层，所述支撑膜层至少包括一层硬化涂层。
  6. 根据权利要求5所述的待剥离临时基板的柔性显示屏，其中，所述支撑膜层包括一层硬化涂层。
  7. 根据权利要求5所述的待剥离临时基板的柔性显示屏，其中，所述支撑膜层包括第一硬化涂层和第二硬化涂层。
  8. 根据权利要求7所述的待剥离临时基板的柔性显示屏，其中，所述支撑膜层还包括柔性树脂层，所述柔性树脂层设置在所述第一硬化涂层与所述第二硬化涂层之间。
  9. 根据权利要求5所述的待剥离临时基板的柔性显示屏，还包括偏光层，所述偏光层设置在所述发光层背离所述柔性衬底的一侧，所述偏光层与所述发光层通过光学胶粘接。
  10. 根据权利要求9所述的待剥离临时基板的柔性显示屏，还包括盖板，所述盖板设置在所述偏光层背离所述发光层的一侧，所述盖板与所述偏光层通过光学胶粘接。
PCT/CN2020/097185 2019-10-31 2020-06-19 柔性显示屏的制作方法及待剥离临时基板的柔性显示屏 WO2021082473A1 (zh)

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