WO2018219129A1 - 胶膜及其制备方法、柔性显示模组 - Google Patents

胶膜及其制备方法、柔性显示模组 Download PDF

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WO2018219129A1
WO2018219129A1 PCT/CN2018/086673 CN2018086673W WO2018219129A1 WO 2018219129 A1 WO2018219129 A1 WO 2018219129A1 CN 2018086673 W CN2018086673 W CN 2018086673W WO 2018219129 A1 WO2018219129 A1 WO 2018219129A1
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film
elastic modulus
functional layer
display module
flexible display
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PCT/CN2018/086673
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English (en)
French (fr)
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刘陆
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京东方科技集团股份有限公司
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Publication of WO2018219129A1 publication Critical patent/WO2018219129A1/zh

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    • 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
    • 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

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  • the present application relates to the field of adhesive technology, and in particular, to a film, a preparation method thereof, and a flexible display module.
  • Adhesive bonding of different structural layers through adhesive film has certain applications in various fields of industry. Taking Optically Clear Adhesive (OCA) in the field of display technology as an example, optical adhesives are generally required in flexible display modules. The film structure is bonded to achieve the assembly and assembly of the entire display module.
  • OCA Optically Clear Adhesive
  • a film wherein the elastic modulus of the film is small in the middle and large in both sides along the thickness direction of the film.
  • the middle is small, and the two sides are widely distributed as a gradual decrease first and then increased distribution.
  • the middle portion is small, and the two sides are distributed in a stepwise manner to decrease and then increase the distribution.
  • the film includes at least three sub-films along a thickness direction of the film, wherein the elastic modulus at any position of the same sub-film is the same.
  • the film is made of optical glue.
  • the film is a double sided film.
  • a flexible display module is further provided.
  • the flexible display module includes a plurality of functional layers, and at least one set of adjacent functional layers is disposed with a film of the optical adhesive material.
  • the flexible display module includes at least three sets of adjacent functional layers, wherein a set of adjacent ones of the at least three adjacent functional layers are located at an intermediate position
  • the adhesive layer is bonded between the functional layers; or the adhesive film is disposed between all adjacent functional layers.
  • the adjacent functional layers are a first functional layer and a second functional layer, and the first functional layer and the second functional layer are adhered by the adhesive film
  • the difference between the elastic modulus at the position where the adhesive film is bonded to the first functional layer and the elastic modulus of the first functional layer is less than or equal to 10 Kpa, and/or the adhesive film is adhered
  • the difference between the elastic modulus at the position of the second functional layer and the elastic modulus of the second functional layer is less than or equal to 10 Kpa.
  • the film has a thickness of 50 ⁇ m to 400 ⁇ m; and/or the elastic modulus of the film is distributed in a range of 10 KPa to 1000 Kpa.
  • a method for preparing a film comprising: combining at least three sub-films disposed in sequence into a whole of the film by lamination, wherein a thickness along the thickness of the film
  • the elastic modulus of the at least three sub-membranes disposed in sequence is small in the middle, large in both sides, and the elastic modulus is the same at any position of the same sub-film; or, will have different elastic moduli
  • the rubber material is sequentially coated in accordance with the distribution order in which the elastic modulus is first decreased and then increased to form the film.
  • FIG. 1 is a schematic structural view of a film according to some embodiments of the present disclosure.
  • FIG. 2 is a schematic structural view of another adhesive film according to some embodiments of the present disclosure.
  • FIG. 3 is a schematic view showing a distribution of elastic modulus of a film according to some embodiments of the present disclosure
  • FIG. 4 is a schematic view showing a distribution of elastic modulus of another film according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a flexible display module according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram of an adjacent functional layer bonded by a film according to some embodiments of the present disclosure.
  • the flexible display module In the production of the flexible display module, when the optical layer is used to bond the film layers, the adjacent film layers are bonded by optical glue, and the flexible display module is in the process of bending.
  • a certain relative displacement (strain) occurs between the film layer and the film layer; in this case, if the elastic modulus of the optical glue is too large, the relative displacement between the film layer and the film layer is difficult, and is equivalent.
  • the stress required in the case of bending strain is relatively large, that is, the overall bending of the flexible display module requires a large force, which cannot be adapted to the bendable product structure and mechanical structure design, and in the case of large stress, the optical film is easily caused. The shedding of the layer and the function of other functional layers are impaired.
  • the elastic modulus of the optical adhesive is too small, the adhesion of the optical adhesive is relatively small, which is not easy to meet the requirements, and the difference between the elastic modulus of the optical adhesive and the adjacent interface is large, and the bending strain is large.
  • the stress is mainly concentrated at the interface, and the deformation also occurs mainly at the interface, thereby reducing the reliability of the flexible display module.
  • Some embodiments of the present disclosure provide a film.
  • the elastic modulus K of the film 100 is small in the middle and large on both sides in the thickness direction O-O' of the film 100.
  • the color depth in the film 100 in FIG. 1 represents the magnitude of the elastic modulus K. The specific darker color indicates that the elastic modulus K is larger, and the lighter color indicates that the elastic modulus K is smaller.
  • the above-mentioned film 100 can be applied to any product that needs to be bent as an adhesive layer between adjacent structures.
  • it may be an optical adhesive which is applied to the field of flexible display and has a good light-transmitting effect; it may also be a non-transparent adhesive film in other fields, which is not limited thereto.
  • the film 100 is an optical glue as an example.
  • Optical adhesives generally consist of the following components: urethane acrylate, acrylate, photoinitiator, coupling agent, other additives.
  • the elastic modulus K of the above optical film can be obtained by adjusting the specific components and contents of the above components.
  • a urethane acrylate having a higher functionality, and/or an acrylate having a longer molecular chain length may be used; a specially modified component monomer may also be used; other methods may be employed to obtain an actual desired size.
  • the adhesive film 100 may be a double-sided adhesive film.
  • the adhesive film has a large elastic modulus at the bonding faces on both sides and a small elastic modulus at the intermediate position, when applied to the flexible display module.
  • the large elastic modulus at the bonding position of the adhesive film and the adjacent functional layer in the flexible module can ensure a large adhesion between the adhesive film and the adjacent functional layer, thereby enabling
  • the small elastic modulus of the middle position of the film can ensure that the flexible display module has sufficient bending strain under proper stress, that is, it is guaranteed
  • the bending strength and bending radius of the flexible display module increase the reliability of the flexible display module.
  • the above-mentioned small in the middle and large in the two sides may be a distribution in which the stepwise first decreases and then increases.
  • the film 100 may have at least three layers of the sub-film 101 as shown in FIG. 2 along the thickness O-O' direction thereof, wherein the elastic modulus K at the same position of the same sub-film 101 is the same, FIG. 2 is
  • the film 100 includes six layers of sub-films 101 (A, B, C, D, E, F) as an example.
  • the elastic modulus K of the six-layer sub-film 101 is along the thickness O-O' direction, and the A sub-film located on the outer side
  • the elastic modulus K of 101 is at most 600 Kpa, and is decreased toward the inner sub-film 101, and the elastic modulus K of the D sub-film 101 located at the middle is at least 20 Kpa, and then the elasticity to the other side sub-film 101 of the adhesive film 100.
  • the modulus K is increased, and the elastic modulus K of the F sub-film 101 on the side is 500 kPa.
  • the specific numerical values in FIG. 3 are merely illustrative, and the disclosure is not limited thereto.
  • the film 100 is stepped from one side to the other along the thickness O-O' direction. Decrease the distribution after the increase.
  • the film 100 is in the direction of the thickness O-O', and the film 100 is an integral structure, which can be controlled by a preparation process. to realise.
  • the elastic modulus K on the thickness direction O-O' of the adhesive film 100 is controlled, and since the intermediate position of the adhesive layer is relatively far from the light source, the elastic modulus is K is small, and the two sides of the glue layer are relatively close to the light source, so the elastic modulus K is large, so that the film 100 is gradually reduced along the thickness O-O' direction and then increased. For example, as shown in FIG.
  • the magnitude of the elastic modulus K from the surface S1 of the film 100 is decreased from the maximum value of 600 Kpa, and the elastic modulus K reduced to the intermediate position is at least 20 Kpa, and the opening is increased to increase to
  • the size of the elastic modulus K of the other surface S2 of the film 100 is 500 kPa.
  • the specific numerical values in FIG. 4 are merely illustrative; however, other manufacturing parameters may be controlled, which is not limited in the present disclosure.
  • the intermediate position in the thickness direction O-O' of the above-mentioned film 100 refers to the area between the surfaces on both sides of the position other than the surface on the both sides of the film 100 in the thickness direction O-O'. Location is not an intermediate position in the absolute sense.
  • Some embodiments of the present disclosure further provide a flexible display module including a plurality of functional layers, and at least one set of adjacent functional layers adopts the above-mentioned adhesive film 100 mainly made of an optical adhesive material. Bonding is performed, and since the flexible display module includes the film as described above, it has the same structure and advantageous effects as the film provided in the foregoing embodiment. Since the foregoing embodiment has been described in detail for the structure and advantageous effects of the film, it will not be described herein.
  • the flexible display module may be an OLED (Organic Light-Emitting Diode) flexible display module, and the OLED flexible display module includes multiple adjacent functional layers.
  • OLED Organic Light-Emitting Diode
  • the OLED display device 01 and the circular polarizer 02 (CPOL) located on the light emitting side of the OLED display device 01, and the touch panel 03 (Touch), the package cover 04 (Cover), etc. are located on the OLED display.
  • Another functional film graphite sheet, metal film, etc. or the like on the backlight side of the device 01, wherein at least one set of adjacent functional layers is bonded by the adhesive film 100 of the optical adhesive material described above.
  • the flexible display module includes at least three sets of adjacent functional layers, for example, four sets of adjacent functional layers are included in FIG. 5; the present disclosure optionally includes the at least three sets of adjacent functions.
  • the above-mentioned adhesive film 100 is bonded between a group of adjacent functional layers in the middle position of the layer, so that the adhesive film 100 is located at an intermediate position in all the adhesive layers, so that the upper and lower sides of the adhesive film 100 can be made Some of the respective systems are formed and the different systems do not affect each other.
  • the intermediate film 100 can effectively absorb and balance the stress during the bending process, thereby effectively reducing damage to the functional layers.
  • a set of adjacent functional layers refers to any two adjacent functional layers, and different sets of adjacent functional layers may have the same functional layer, for example, as shown in FIG. 5 .
  • the five functional layers have four sets of adjacent functional layers, and the OLED display device 01 and the circular polarizer 02 are a set of adjacent functional layers, and the circular polarizer 02 and the touch panel 03 are a set of adjacent functional layers. Wait.
  • a set of adjacent functional layers in the above intermediate position refers to an adjacent functional layer located at an intermediate position except for two sets of adjacent functional layers on both sides, for example, in FIG.
  • the polarizer 02, the circular polarizer 02 and the touch panel 03 can both be regarded as adjacent functional layers in the intermediate position, that is, the adhesive film 100 can be disposed between the circular polarizer 02 and the touch panel 03, or in a circularly polarized light.
  • the film 100 is disposed between the sheet 02 and the touch panel 03, so that the display device 01 and the touch panel 03 can be placed in different systems, thereby reducing the damage to the display device 01 and the touch panel 03.
  • all the adjacent functional layers may be bonded by using the above-mentioned adhesive film 100 to ensure that the flexible display module has sufficient bending strain under the proper stress to ensure the effective guarantee.
  • the bending strength and bending radius of the flexible display module increase the reliability of the flexible display module.
  • the above-mentioned adjacent functional layers are the first functional layer 10 and the second functional layer 20 , and the first functional layer 10 and the second functional layer 20 are bonded by the adhesive film 100 as an example.
  • the difference between the elastic modulus K2 at the position where the adhesive film 100 is bonded to the first functional layer 10 and the elastic modulus K1 of the first functional layer 10 is less than or equal to 10 Kpa, that is,
  • the adhesive force between the film 100 and the first functional layer 10 is small, and the bonding effect between the two cannot be effectively ensured; on the other hand, K1 In the case of -K2>10, the elastic modulus K2 at the position where the film 100 is bonded to the first functional layer 10 is large, which causes the bending stress of the entire flexible module to be large, which is disadvantageous to the bending of the flexible module, so
  • the difference between the elastic modulus K2 at the position where the adhesive film 100 is bonded to the first functional layer 10 and the elastic modulus K1 of the first functional layer 10 is less than or equal to 10 Kpa, that is,
  • the difference between the elastic modulus K2 at the position where the above-mentioned adhesive film 100 is bonded to the first functional layer 10 and the elastic modulus K1 of the first functional layer 10 is less than or equal to 10 Kpa, that is,
  • the elastic modulus K2 at the position where the adhesive film 100 is bonded to the first functional layer 10 is smaller than the elastic modulus K1 of the first functional layer 10,
  • the elastic modulus K2 at the position where the adhesive film 100 is bonded to the first functional layer 10 is 5 Kpa smaller than the elastic modulus K1 of the first functional layer 10.
  • the difference between the elastic modulus K3 at the position where the adhesive film 100 is bonded to the second functional layer 20 and the elastic modulus K4 of the second functional layer 20 is less than or equal to 10 Kpa, that is,
  • the elastic modulus K2 at the position where the above-mentioned adhesive film 100 is bonded to the first functional layer 10 and the elastic modulus K3 at the position where the adhesive film 100 is bonded to the second functional layer 20 may be equal or not equal.
  • the specific setting needs to be determined according to the magnitude of the elastic modulus of the first functional layer 10 and the second functional layer 20. For example, if the elastic moduli of the first functional layer 10 and the second functional layer 20 are equal, the elastic modulus K2 at which the adhesive film 100 is bonded to the first functional layer 10 and the second functional layer of the adhesive film 100 may be disposed.
  • the elastic modulus K3 at the 20 positions is equal; of course, if the elastic moduli of the first functional layer 10 and the second functional layer 20 are not equal, the adhesive film 100 may be provided to bond the first functional layer 10 as shown in FIG.
  • the elastic modulus K2 at the position (A sub-film) is not equal to the elastic modulus K3 at the position where the adhesive film 100 is bonded to the second functional layer 20 (F sub-film); however, the present disclosure is not limited thereto.
  • the thickness of the above-mentioned film 100 may be 50 ⁇ m to 400 ⁇ m.
  • the thickness of the adhesive film 100 is greater than 400 ⁇ m, the thickness of the entire adhesive film 100 is large, so that the thickness of the flexible display module bonded by the adhesive film 100 is too large, which is disadvantageous to realize the light and thin design concept of the display panel; If the thickness of the adhesive film 100 is less than 50 ⁇ m, the thickness of the adhesive film 100 is too small to effectively reduce the thickness of the flexible display module under appropriate stress, so that the thickness of the adhesive film 100 is optional in the present disclosure. It is 50 ⁇ m to 400 ⁇ m, and may be, for example, 100 ⁇ m to 350 ⁇ m.
  • the elastic modulus of the film 100 can be distributed in the range of 10 Kpa to 1000 Kpa.
  • the elastic modulus of the adhesive film 100 is greater than 1000 Kpa, the bending force and the bending radius of the flexible display module are adversely affected, which is disadvantageous to the bending strain of the flexible display module; if the elastic modulus of the adhesive film 100 When the thickness is less than 10 kPa, the adhesive force is limited, which is disadvantageous for the adhesion between the functional layers in the flexible display module. Therefore, in the present disclosure, the elastic modulus of the adhesive film 100 is distributed in the range of 10 Kpa to 1000 Kpa, for example. It can be in the range of 20Kpa to 600Kpa.
  • the at least three sub-films disposed in sequence are combined into a monolithic film by lamination, wherein the elastic modulus of at least three sub-films disposed in sequence along the thickness direction O-O' of the film is intermediate Small, both sides are large, and the elastic modulus at any position of the same sub-film is the same.
  • the exemplary method may include: firstly, different liquid optical glues may be formed by mixing optical compound reagents of different ratios or different components, by stirring, defoaming, etc.; A liquid optical film is formed on the liquid film; finally, it is cured by ultraviolet light to form sub-films of different elastic moduli, respectively.
  • the sub-films of different elastic moduli are combined in the thickness direction O-O' according to the elastic modulus to have a small intermediate portion and a large distribution on both sides, and are laminated into an integral film by lamination.
  • the rubber materials having different elastic moduli are sequentially coated in accordance with the distribution order in which the elastic modulus is first decreased and then increased to form a film.
  • the exemplary method may include: firstly, different liquid optical glues may be formed by mixing optical components of different ratios or different components by stirring, defoaming, etc. (via ultraviolet light) The cured film has a different modulus of elasticity).
  • coating is sequentially performed on the substrate in accordance with the distribution order in which the elastic modulus is first decreased and then increased, and then cured by ultraviolet light to form a film.

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Abstract

提供一种胶膜，在沿所述胶膜的厚度方向上，所述胶膜的弹性模量呈中间小、两侧大分布。还提供一种柔性显示模组，所述柔性显示模组包括多个功能层，且至少一组相邻的所述功能层之间设置有如前所述的胶膜。此外，还提供了一种胶膜制备方法。

Description

胶膜及其制备方法、柔性显示模组
本申请要求于2017年06月01日提交中国专利局、申请号为201710406174.1、申请名称为“一种胶膜及其制备方法、柔性显示模组”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及胶粘技术领域，尤其涉及一种胶膜及其制备方法、柔性显示模组。
背景技术
通过胶膜将不同结构层进行粘合在各行业领域均有一定的应用，以在显示技术领域中的光学胶(Optically Clear Adhesive，OCA)为例，在柔性显示模组中一般需要采用光学胶将各膜层结构进行粘合，以实现整个显示模组的贴合组装。
发明内容
一方面，提供一种胶膜，在沿所述胶膜的厚度方向上，所述胶膜的弹性模量呈中间小、两侧大分布。
在本公开的一些实施例中，所述中间小、两侧大分布为渐变式先减小后增加的分布。
在本公开的一些实施例中，所述中间小、两侧大分布为阶梯式先减小后增加的分布。
在本公开的一些实施例中，在沿所述胶膜的厚度方向上，所述胶膜包括至少三层子膜，其中，同一所述子膜的任一位置处的弹性模量相同。
在本公开的一些实施例中，所述胶膜的材质为光学胶。
在本公开的一些实施例中，所述胶膜为双面胶膜。
另一方面，还提供一种柔性显示模组，所述柔性显示模组包括多个功能层，且至少一组相邻的所述功能层之间设置有上述光学胶材质的胶膜。
在本公开的一些实施例中，所述柔性显示模组包括至少三组相邻的所述功能层，其中，所述至少三组相邻的所述功能层中位于中间位置的一组相邻的所述功能层之间采用所述胶膜进行粘合；或者，所有相邻的所述功能层之间均设置有所述胶膜。
在本公开的一些实施例中，所述相邻的所述功能层为第一功能层和第二功能层，且所述第一功能层和所述第二功能层通过所述胶膜进行粘合；其中，所述胶膜粘合所述第一功能层位置处的弹性模量与所述第一功能层的弹性模量的差值小于或等于10Kpa，和/或，所述胶膜粘合所述第二功能层位置处的弹性模量与所述第二功能层的弹性模量的差值小于或等于10Kpa。
在本公开的一些实施例中，所述胶膜的厚度为50μm～400μm；和/或，所述胶膜的弹性模量分布于10Kpa～1000Kpa的区间内。
再一方面，还提供一种胶膜的制备方法，包括：将依次设置的至少三层子膜通过层压的方式结合为一整体的所述胶膜，其中，沿所述胶膜的厚度方向上，所述依次设置的至少三层子膜的弹性模量呈中间小、两侧大分布，且同一所述子膜的任一位置处的弹性模量相同；或者，将具有不同弹性模量的胶材，按照弹性模量先减小后增大的分布顺序依次进行涂布，以形成所述胶膜。
附图说明
图1为本公开一些实施例提供的一种胶膜的结构示意图；
图2为本公开一些实施例提供的另一种胶膜的结构示意图；
图3为本公开一些实施例提供的一种胶膜的弹性模量的分布示意图；
图4为本公开一些实施例提供的另一种胶膜的弹性模量的分布示意图；
图5为本公开一些实施例提供的一种柔性显示模组的结构示意图；
图6为本公开一些实施例提供的一种相邻功能层通过胶膜粘合的示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开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公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
在柔性显示模组的制作中当采用光学胶将各膜层结构进行粘合时，由于相邻的膜层之间均通过光学胶进行粘合，且柔性显示模组在弯折的过程中，膜层与膜层之间会发生一定的相对位移(应变)；在此情况下，如果 该光学胶的弹性模量过大，则膜层与膜层之间发生相对位移比较困难，且在同等的弯曲应变情况下需要的应力比较大，即柔性显示模组整体弯曲需要的力度较大，无法适合可弯曲的产品结构和机械结构设计，并且在应力较大的情况下，容易导致光学胶膜层的脱落，以及其他功能膜层的功能受损。如果该光学胶的弹性模量过小，则该光学胶的粘附力就比较小，不容易满足要求，并且该光学胶与相邻的界面的弹性模量的差值较大，在弯曲应变中，应力主要集中在交界面，形变也主要发生在交界面，从而会降低该柔性显示模组的信赖性。
本公开一些实施例提供一种胶膜，如图1所示，在沿该胶膜100的厚度方向O-O’上，该胶膜100的弹性模量K呈中间小、两侧大分布，其中图1中胶膜100中颜色深浅代表弹性模量K的大小，具体的颜色较深的位置处表示弹性模量K较大，颜色较浅的位置处表示弹性模量K较小。
此处需要说明的是，上述胶膜100可以是应用于任何需要弯曲的产品中，作为粘合相邻结构之间的粘合层。例如可以是应用于柔性显示领域、具有较好透光效果的光学胶；也可以是其他领域的非透明的胶膜，对此不做限定。以下实施例均是以该胶膜100为光学胶为例进行相关的说明。
光学胶一般采用以下组分：聚氨酯丙烯酸、丙烯酸酯、光引发剂、偶联剂、其他助剂等组成。
上述光学胶膜的弹性模量K可以通过调整上述组分的具体成分以及含量来获取。例如，可以选用官能度较高的聚氨酯丙烯酸，和/或，分子链段较长的丙烯酸酯；也可以采用特殊改性的组分单体；还可以采用其他的方法，以获取实际需要大小的弹性模量K的光学胶膜。
在本公开的一些实施例中，上述胶膜100可以为双面胶膜。
综上所述，由于该胶膜位于两侧的粘结面处具有较大的弹性模量，而中间位置处具有较小的弹性模量，这样一来，在应用于柔性显示模组时，一方面，该胶膜与柔性模组中相邻的功能层进行粘合位置处的较大弹性模量能够保证该胶膜与相邻的功能层之间具有较大的粘附力，从而能够保证整个显示模组粘合组装的可靠性；另一方面，该胶膜中间位置的较小弹性模量能够保证在适当的应力下，该柔性显示模组具有足够的弯曲应变，也即保证了柔性显示模组的弯曲力度和弯曲半径，从而增加了该柔性显示模组的信赖性。
以下对上述在沿该胶膜100的厚度方向O-O’上，该胶膜100的弹性模 量K呈中间小、两侧大分布的具体情况做出说明。
例如，上述中间小、两侧大分布可以为阶梯式先减小后增加的分布。
胶膜100在沿其厚度O-O’方向上，可以如图2所示，包括至少三层子膜101，其中，同一子膜101的任一位置处的弹性模量K相同，图2是以该胶膜100包括六层子膜101(A、B、C、D、E、F)为例进行说明。
如图3所示(图2中子膜的弹性模量大小的条形分布图)，该六层子膜101的弹性模量K沿其厚度O-O’方向上，位于外侧的A子膜101的弹性模量K最大为600Kpa，并向内侧的子膜101减小，位于中间的D子膜101的弹性模量K最小为20Kpa，然后向胶膜100的另一侧子膜101的弹性模量K增加，位于该侧的F子膜101的弹性模量K为500Kpa。当然图3中的具体数值仅为举例说明，本公开并不限制于此，在此情况下，胶膜100在沿其厚度O-O’方向上，由一侧向另一侧呈阶梯式先减小后增加的分布。
又例如，上述中间小、两侧大分布为渐变式先减小后增加的分布，该胶膜100在沿其厚度O-O’方向上，该胶膜100为整体结构，可以通过控制制备工艺来实现。
例如，通过控制胶层进行光固化时的光照强度，来实现对胶膜100的厚度方向O-O’上弹性模量K的控制，由于胶层中间位置距离光源相对较远，因此弹性模量K较小，而胶层两侧位置距离光源相对较近，因此弹性模量K较大，从而使得胶膜100在沿其厚度O-O’方向上，呈渐变式先减小后增加的分布；例如，如图4所示，从胶膜100的表面S1的弹性模量K的大小从最大值600Kpa开始递减，减小至中间位置的弹性模量K最小为20Kpa后，开启递增，增加至胶膜100的另一表面S2的弹性模量K的大小为500Kpa，其中，图4中的具体数值仅为举例说明；当然也可以控制其他制作参数，本公开对此不作限定。
需要说明的是，上述胶膜100的厚度方向O-O’上的中间位置，是指在厚度方向O-O’上除了胶膜100两侧的表面以外，位置两侧的表面之间的区域位置，并不是绝对意义上的中间位置。
本公开一些实施例还提供一种柔性显示模组，该柔性显示模组包括多个功能层，且至少一组相邻的功能层之间采用上述的主要由光学胶材料制成的胶膜100进行粘合，由于该柔性显示模组包括如上所述的胶膜，具有与前述实施例提供的胶膜相同的结构和有益效果。由于前述实施例已经对 胶膜的结构和有益效果进行了详细的描述，此处不再赘述。
在一些实施例中，如图5所示，该柔性显示模组可以为OLED(Organic Light-Emitting Diode，有机发光二极管)柔性显示模组，该OLED柔性显示模组包括多个相邻的功能层，例如，OLED显示器件01、以及位于OLED显示器件01的出光侧的圆偏光片02(Circular Polarizer，CPOL)、以及触控面板03(Touch)、封装盖板04(Cover)等、位于OLED显示器件01的背光侧的其他功能膜(石墨片、金属膜片等)等，其中，至少一组相邻的功能层之间采用上述光学胶材料的胶膜100进行粘合。
可选的，在柔性显示模组包括至少三组相邻的功能层的情况下，例如，图5中包括四组相邻的功能层；本公开可选的，该至少三组相邻的功能层中位于中间位置的一组相邻的功能层之间采用上述胶膜100进行粘合，这样一来，所有胶层中该胶膜100位于中间位置，从而能够使得该胶膜100的上下两部分各自形成体系且不同体系之间互不影响，中间的胶膜100在弯折过程中能够有效的起到吸收和平衡应力的作用，进而能有效的降低对各功能层的损坏。
此处需要说明的是，上述一组相邻的功能层是指，任一相邻的两个功能层，不同组的相邻的功能层之间可以具有相同的功能层，例如图5中包括五个功能层，则具有四组相邻的功能层，OLED显示器件01与圆偏光片02为一组相邻的功能层，圆偏光片02与触控面板03为一组相邻的功能层等。另外，上述中间位置的一组相邻的功能层是指，除了两侧的两组相邻的功能层以外，位于中间位置的相邻的功能层，例如图5中，OLED显示器件01与圆偏光片02、圆偏光片02与触控面板03，均可以视为中间位置的相邻的功能层，即可以在圆偏光片02与触控面板03之间设置胶膜100，或者在圆偏光片02与触控面板03之间设置胶膜100，从而能够使得显示器件01和触控面板03位于不同的体系，进而降低了对降低了对显示器件01和触控面板03的损坏。
可选的，所有相邻的功能层之间可以均采用上述胶膜100进行粘合，以最大程度的保证在适当的应力下，该柔性显示模组具有足够的弯曲应变，从而有效的保证了柔性显示模组的弯曲力度和弯曲半径，增加该柔性显示模组的信赖性。
此外，如图6所示，以上述相邻的功能层为第一功能层10和第二功能层20，且第一功能层10和第二功能层20通过胶膜100进行粘合为例，本 公开的一些实施例中，胶膜100粘合第一功能层10位置处的弹性模量K2与第一功能层10的弹性模量K1的差值小于或等于10Kpa，即|K1-K2|≤10；和/或，胶膜100粘合第二功能层20位置处的弹性模量K3与第二功能层20的弹性模量K4的差值小于或等于10Kpa，即|K3-K4|≤10。
示例性的，若|K1-K2|＞10，即K1-K2＞10，或者K2-K1＞10；胶膜100粘合第一功能层10位置处的弹性模量K2与第一功能层10的弹性模量K1的差值过大，一方面，胶膜100与第一功能层10之间的粘合力较小，不能有效的保证两者之间的粘结效果；另一方面，K1-K2＞10的情况下，胶膜100粘合第一功能层10位置处的弹性模量K2较大，会使得整个柔性模组的弯曲应力较大，不利于柔性模组的弯曲，因此本公开的一些实施例中可选的的，胶膜100粘合第一功能层10位置处的弹性模量K2与第一功能层10的弹性模量K1的差值小于或等于10Kpa，即|K1-K2|≤10。
此处需要说明的是，上述胶膜100粘合第一功能层10位置处的弹性模量K2与第一功能层10的弹性模量K1的差值小于或等于10Kpa，即|K1-K2|≤10的基础上，为了进一步保证柔性显示模组的弯曲，可选的，胶膜100粘合第一功能层10位置处的弹性模量K2比第一功能层10的弹性模量K1小，例如可以设置，胶膜100粘合第一功能层10位置处的弹性模量K2比第一功能层10的弹性模量K1小5Kpa。
同样在另一些实施例中的，胶膜100粘合第二功能层20位置处的弹性模量K3与第二功能层20的弹性模量K4的差值小于或等于10Kpa，即|K3-K4|≤10；胶膜100粘合第二功能层20位置处的弹性模量K3小于第二功能层20的弹性模量K4的弹性模量K4，具体理由同上，此处不再赘述。
此处需要说明的是，上述胶膜100粘合第一功能层10位置处的弹性模量K2与胶膜100粘合第二功能层20位置处的弹性模量K3可以相等，也可以不相等，具体设置情况需要根据第一功能层10和第二功能层20的弹性模量的大小而定。例如，若第一功能层10和第二功能层20的弹性模量相等，则可以设置胶膜100粘合第一功能层10位置处的弹性模量K2与胶膜100粘合第二功能层20位置处的弹性模量K3相等；当然，若第一功能层10和第二功能层20的弹性模量不相等，则可以如图3所示，设置胶膜100粘合第一功能层10位置处(A子膜)的弹性模量K2与胶膜100粘合第二功能层20位置处(F子膜)的弹性模量K3不相等；但本公开并不限制于此。
此外，示例性的，上述胶膜100的厚度可以为50μm～400μm。
可选的，若胶膜100厚度大于400μm，整个胶膜100厚度较大，会使得通过该胶膜100粘合的柔性显示模组的厚度过大，不利于实现显示面板的轻薄化设计理念；若胶膜100厚度小于50μm，该胶膜100的厚度过小，不能有效的在适当的应力下，使得该柔性显示模组具有足够的弯曲应变，因此本公开可选的，胶膜100的厚度为50μm～400μm，例如，可以是在100μm～350μm。
在此基础上，示例性的，胶膜100的弹性模量可以分布于10Kpa～1000Kpa的区间内。
可选的，若胶膜100的弹性模量大于1000Kpa，会对整个柔性显示模组的弯曲力度和弯曲半径造成不良影响，不利于柔性显示模组的弯曲应变；若胶膜100的弹性模量小于10Kpa，则粘结力受到限制，不利于柔性显示模组中各功能层之间的粘合，因此，本公开可选的，胶膜100的弹性模量分布于10Kpa～1000Kpa的区间内例如，可以是在20Kpa～600Kpa的范围内。
本公开一些实施例还提供一种胶膜的制备方法：
将依次设置的至少三层子膜通过层压的方式结合为一整体的胶膜，其中，沿胶膜的厚度方向O-O’上，依次设置的至少三层子膜的弹性模量呈中间小、两侧大分布，且同一子膜的任一位置处的弹性模量相同。
以紫外光固化光学胶为例，示例性的上述方法可以包括：首先可以通过混合不同配比或者不同组分的光学胶试剂，通过搅拌、除泡等工艺形成不同的液态光学胶；然后在基板上形成液态的光学胶膜；最后通过紫外光进行固化，分别形成不同弹性模量的子膜。
接下来，将不同弹性模量的子膜，沿厚度方向O-O’上，按照弹性模量呈中间小、两侧大分布，通过层压的方式结合为一整体的胶膜。
本公开实施例还提供另一种胶膜的制备方法：
将具有不同弹性模量的胶材，按照弹性模量先减小后增大的分布顺序依次进行涂布，以形成胶膜。
以紫外光固化光学胶为例，示例性的上述方法可以包括：首先可以通过混合不同配比或者不同组分的光学胶试剂，通过搅拌、除泡等工艺形成不同的液态光学胶(经紫外光固化后的胶膜具有不同的弹性模量)。
接下来，在基板上按照弹性模量先减小后增大的分布顺序依次进行涂 布，然后通过紫外光固化，形成胶膜。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (11)

  1. 一种胶膜，其中，在沿所述胶膜的厚度方向上，所述胶膜的弹性模量呈中间小、两侧大分布。
  2. 根据权利要求1所述的胶膜，其中，所述中间小、两侧大分布为渐变式先减小后增加的分布。
  3. 根据权利要求1所述的胶膜，其中，所述中间小、两侧大分布为阶梯式先减小后增加的分布。
  4. 根据权利要求3所述的胶膜，其中，在沿所述胶膜的厚度方向上，所述胶膜包括至少三层子膜，其中，同一所述子膜的任一位置处的弹性模量相同。
  5. 根据权利要求1-4任一项所述的胶膜，其中，所述胶膜的材质为光学胶。
  6. 根据权利要求1-5任一项所述的胶膜，其特征在于，所述胶膜为双面胶膜。
  7. 一种柔性显示模组，其中，所述柔性显示模组包括多个功能层，且至少一组相邻的所述功能层之间设置有如权利要求1-6任一项所述的胶膜。
  8. 根据权利要求7所述的柔性显示模组，其中，所述柔性显示模组包括至少三组相邻的所述功能层，其中，所述至少三组相邻的所述功能层中位于中间位置的一组相邻的所述功能层之间设置有所述胶膜；
    或者，所有相邻的所述功能层之间均设置所述胶膜。
  9. 根据权利要求7所述的柔性显示模组，其中，所述相邻的所述功能层为第一功能层和第二功能层，且所述第一功能层和所述第二功能层通过所述胶膜进行粘合；
    其中，所述胶膜粘合所述第一功能层位置处的弹性模量与所述第一功能层的弹性模量的差值小于或等于10Kpa，和/或，所述胶膜粘合所述第二功能层位置处的弹性模量与所述第二功能层的弹性模量的差值小于或等于10Kpa。
  10. 根据权利要求7-9任一项所述的柔性显示模组，其中，
    所述胶膜的厚度为50μm～400μm；
    和/或，所述胶膜的弹性模量分布于10Kpa～1000Kpa的区间内。
  11. 一种胶膜的制备方法，其中，包括：
    将依次设置的至少三层子膜通过层压的方式结合为一整体的所述胶膜，其中，沿所述胶膜的厚度方向上，所述依次设置的至少三层子膜的弹性模量呈中间小、两侧大分布，且同一所述子膜的任一位置处的弹性模量相同；
    或者，将具有不同弹性模量的胶材，按照弹性模量先减小后增大的分布顺序依次进行涂布，以形成所述胶膜。
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