CN107216819B - Adhesive film, preparation method thereof and flexible display module - Google Patents
Adhesive film, preparation method thereof and flexible display module Download PDFInfo
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- CN107216819B CN107216819B CN201710406174.1A CN201710406174A CN107216819B CN 107216819 B CN107216819 B CN 107216819B CN 201710406174 A CN201710406174 A CN 201710406174A CN 107216819 B CN107216819 B CN 107216819B
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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
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- 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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Abstract
The embodiment of the invention provides an adhesive film, a preparation method of the adhesive film and a flexible display module, relates to the technical field of adhesion, and aims to provide the adhesive film with gradually changed elastic modulus, so that when the adhesive film is applied to the flexible display module, the module can be ensured to have enough bending strain under appropriate stress. The elastic modulus of the double-sided adhesive film is distributed along the thickness direction of the double-sided adhesive film in a small middle and large two sides.
Description
Technical Field
The invention relates to the technical field of adhesion, in particular to an adhesive film, a preparation method thereof and a flexible display module.
Background
Different structural layers are bonded through Adhesive films and have certain application in various industry fields, Optical Clear Adhesive (OCA) in the technical field of display is taken as an example, and specifically, optical Adhesive is generally adopted to bond film structures in a flexible display module so as to realize the bonding and assembly of the whole display module.
However, since the adjacent film layers are bonded by the optical cement, and the flexible display module is bent, a certain relative displacement (strain) occurs between the film layers; in this case, if the elastic modulus of the optical adhesive is too large, the relative displacement between the film layer and the film layer is difficult, and the stress ratio required under the same bending strain condition is large, that is, the strength required by the overall bending of the flexible display module is large, and the flexible display module cannot be suitable for the design of bendable product structures and mechanical mechanisms, and under the condition of large stress, the optical adhesive film layer is easy to fall off, and the functions of other functional film layers are damaged. If the elastic modulus of the optical adhesive is too small, the adhesion force of the optical adhesive is small, the requirement is not easy to meet, the difference value of the elastic modulus of the optical adhesive and the elastic modulus of an adjacent interface is large, stress is mainly concentrated on the interface in bending strain, deformation is mainly generated on the interface, and therefore the reliability of the flexible display module can be reduced.
Disclosure of Invention
The embodiment of the invention provides an adhesive film, a preparation method thereof and a flexible display module.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, the embodiment of the invention provides a double-sided adhesive film, and the elastic modulus of the double-sided adhesive film is distributed in a small middle and large two sides along the thickness direction of the double-sided adhesive film.
Furthermore, the middle small distribution and the two side large distribution are gradually decreased and then increased.
Furthermore, the middle small distribution and the two sides large distribution are in a step-type distribution which is firstly reduced and then increased.
Further, in the thickness direction of the double-sided adhesive film, the double-sided adhesive film comprises at least three layers of sub-films, wherein the elastic modulus of any position of the same sub-film is the same.
Furthermore, the double-sided adhesive film is made of optical adhesive.
The embodiment of the invention also provides a flexible display module, which comprises a plurality of functional layers, and at least one group of adjacent functional layers are bonded by adopting the double-sided adhesive film made of the optical adhesive material.
Further, the flexible display module comprises at least three groups of adjacent functional layers, wherein a group of adjacent functional layers positioned in the middle of the at least three groups of adjacent functional layers are bonded by the double-sided adhesive film; or all the adjacent functional layers are bonded by the double-sided adhesive film.
Further, 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 bonded through the double-sided adhesive film; the difference value between the elastic modulus of the position where the double-sided adhesive film is bonded with the first functional layer and the elastic modulus of the first functional layer is smaller than or equal to 10Kpa, and/or the difference value between the elastic modulus of the position where the double-sided adhesive film is bonded with the second functional layer and the elastic modulus of the second functional layer is smaller than or equal to 10 Kpa.
Further, the thickness of the double-sided adhesive film is 50-400 μm; and/or the elastic modulus of the double-sided adhesive film is distributed in the range of 10Kpa to 1000 Kpa.
In another aspect, an embodiment of the present invention further provides a method for preparing a double-sided adhesive film, including: combining at least three layers of sequentially arranged sub-films into a whole double-sided adhesive film in a laminating manner, wherein the elastic modulus of the at least three layers of sequentially arranged sub-films is distributed in a manner that the middle is small and the two sides are large along the thickness direction of the double-sided adhesive film, and the elastic modulus of any position of the same sub-film is the same; or sequentially coating the adhesive materials with different elastic moduli according to the distribution sequence that the elastic moduli are firstly reduced and then increased to form the double-sided adhesive film.
The embodiment of the invention provides an adhesive film and a preparation method thereof, and a flexible display module, wherein in the thickness direction of the double-sided adhesive film, the elastic modulus of the double-sided adhesive film is distributed in a small middle part and large two sides, and the double-sided adhesive film has a larger elastic modulus at the bonding surfaces at the two sides and a smaller elastic modulus at the middle position, so that when the adhesive film is applied to the flexible display module, on one hand, the larger elastic modulus at the bonding position between the double-sided adhesive film and the adjacent functional layer in the flexible module can ensure that the double-sided adhesive film and the adjacent functional layer have larger adhesive force, thereby ensuring the reliability of bonding and assembling of the whole display module; on the other hand, the smaller elastic modulus of the middle position of the double-sided adhesive film can ensure that the flexible display module has enough bending strain under proper stress, and the bending strength and the bending radius of the flexible display module are also ensured, so that the reliability of the flexible display module is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a double-sided adhesive film according to an embodiment of the present invention;
fig. 2 is a schematic structural view of another double-sided adhesive film according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a distribution of elastic modulus of a double-sided adhesive film according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a distribution of elastic modulus of another double-sided adhesive film according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a flexible display module according to an embodiment of the present invention;
fig. 6 is a schematic view of bonding adjacent functional layers by a double-sided adhesive film according to an embodiment of the present invention.
Reference numerals:
100-double-sided adhesive film; 101-daughter film; 01-a display device; 02-circular polarizer; 03-a touch panel; 04-packaging a cover plate; 10-a first functional layer; 20-a second functional layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a double-sided adhesive film, as shown in fig. 1, in a thickness direction O-O' of the double-sided adhesive film 100, an elastic modulus K of the double-sided adhesive film 100 is distributed with a small middle and large sides, wherein a dark color in the double-sided adhesive film 100 in fig. 1 represents a magnitude of the elastic modulus K, a specific dark color position represents a large elastic modulus K, and a light color position represents a small elastic modulus K.
It should be noted here that the double-sided adhesive film 100 can be applied to any product that needs to be bent, and is used as an adhesive layer for adhering adjacent structures; for example, the optical adhesive can be applied to the field of flexible display and has a better light transmission effect; the adhesive film may be a non-transparent adhesive film in other fields, which is not limited in the present invention. The following examples are provided to further illustrate the present invention by taking the double-sided adhesive film 100 as an optical adhesive.
Specifically, the existing optical cement generally adopts the following components: polyurethane acrylic acid, acrylic ester, a photoinitiator, a coupling agent, other auxiliary agents and the like.
The elastic modulus K of the optical adhesive film can be adjusted by adjusting the specific components and contents of the components, for example, urethane acrylic with higher functionality and/or acrylate with longer molecular chain segment can be selected; specially modified component monomers may also be employed; other methods can be used to obtain an optical film with an elastic modulus K of a desired magnitude.
In summary, since the double-sided adhesive film has a larger elastic modulus at the bonding surfaces at the two sides and a smaller elastic modulus at the middle position, when the double-sided adhesive film is applied to a flexible display module, on one hand, the larger elastic modulus at the bonding position between the double-sided adhesive film and the adjacent functional layer in the flexible module can ensure that the double-sided adhesive film and the adjacent functional layer have a larger adhesive force, so that the reliability of bonding and assembling the whole display module can be ensured; on the other hand, the smaller elastic modulus of the middle position of the double-sided adhesive film can ensure that the flexible display module has enough bending strain under proper stress, and the bending strength and the bending radius of the flexible display module are also ensured, so that the reliability of the flexible display module is improved.
The specific case where the elastic modulus K of the double-sided adhesive film 100 is distributed in the thickness direction O-O' of the double-sided adhesive film 100 with a small center and large sides will be described further below.
For example, the middle small distribution and the two-side large distribution may be stepwise decreasing distribution and then increasing distribution.
Specifically, the double-sided adhesive film 100 may include at least three sub-films 101 along the thickness O-O 'direction as shown in fig. 2, wherein the elastic modulus K of the same sub-film 101 is the same at any position, and fig. 2 illustrates that the double-sided adhesive film 100 includes six sub-films 101(A, B, C, D, E, F), as shown in fig. 3 (a bar graph showing the elastic modulus of the sub-films in fig. 2), the elastic modulus K of the six sub-films 101 along the thickness O-O' direction is at most 600Kpa for the a sub-film 101 located at the outer side, and decreases for the sub-film 101 located at the inner side, the elastic modulus K of the D sub-film 101 located at the middle is at least 20Kpa, and then increases for the elastic modulus K of the sub-film 101 at the other side of the double-sided adhesive film 100, and the elastic modulus K of the F sub-film 101 located at the one side is 500Kpa, although the specific values in fig. 3 are only illustrated as examples, the present invention is not limited thereto, and in this case, the double-sided adhesive film 100 is distributed in a stepwise manner in which the thickness decreases first and then increases along the thickness O-O' direction.
For another example, the middle small distribution and the two-side large distribution are gradually decreased and then increased, the double-sided adhesive film 100 is an integral structure along the thickness O-O' direction of the double-sided adhesive film 100, and the preparation process can be controlled to realize the double-sided adhesive film.
For example, the control of the elastic modulus K in the thickness direction O-O 'of the double-sided adhesive film 100 is realized by controlling the illumination intensity when the adhesive layer is photocured, because the middle position of the adhesive layer is relatively far away from the light source, the elastic modulus K is small, and the positions on both sides of the adhesive layer are relatively close to the light source, the elastic modulus K is large, so that the double-sided adhesive film 100 is gradually decreased and then increased along the thickness O-O' direction; for example, as shown in fig. 4, the magnitude of the elastic modulus K of the surface S1 of the double-sided adhesive film 100 decreases from the maximum value of 600Kpa, and after decreasing to the middle position where the elastic modulus K is 20Kpa minimum, the film is opened to increase in an increasing manner to the magnitude of the elastic modulus K of the other surface S2 of the double-sided adhesive film 100 of 500Kpa, where the specific values in fig. 4 are merely exemplary; of course, other manufacturing parameters may be controlled, and the present invention is not limited thereto.
The intermediate position in the thickness direction O-O 'of the double-sided adhesive film 100 is an area position between both surfaces of the double-sided adhesive film 100 in the thickness direction O-O' except for both surfaces, and is not an absolute intermediate position.
The embodiment of the invention also provides a flexible display module, which comprises a plurality of functional layers, and at least one group of adjacent functional layers are bonded by the double-sided adhesive film 100 mainly made of the optical adhesive material. Since the foregoing embodiments have described the structure and beneficial effects of the double-sided adhesive film in detail, the details are not repeated here.
Specifically, as shown in fig. 5, the flexible display module may be an OLED (Organic Light-emitting diode) flexible display module, and the OLED flexible display module includes a plurality of adjacent functional layers, for example, an OLED display device 01, a circular polarizer 02(CPOL) located on a Light emitting side of the OLED display device 01, a Touch panel 03(Touch), a Cover plate 04(Cover), and other functional films (a graphite sheet, a metal film, and the like) located on a backlight side of the OLED display device 01, and the like, wherein at least one group of adjacent functional layers is bonded by using the adhesive film 100 of the optical adhesive material.
Further, in the case that the flexible display module includes at least three sets of adjacent functional layers, for example, fig. 5 includes four sets of adjacent functional layers; preferably, the double-sided adhesive film 100 is used for bonding a group of adjacent functional layers located in the middle of the at least three groups of adjacent functional layers, so that the double-sided adhesive film 100 is located in the middle of all the adhesive layers, the upper part and the lower part of the double-sided adhesive film 100 can form a system respectively, different systems are not affected with each other, and the middle double-sided adhesive film 100 can effectively play a role in absorbing and balancing stress in the bending process, thereby effectively reducing the damage to each functional layer.
It should be noted that, the above-mentioned one group of adjacent functional layers means that any two adjacent functional layers may have the same functional layer, and for example, if fig. 5 includes five functional layers, there are four groups of adjacent functional layers, the OLED display device 01 and the circular polarizer 02 are one group of adjacent functional layers, and the circular polarizer 02 and the touch panel 03 are one group of adjacent functional layers. In addition, the above-mentioned one group of adjacent functional layers in the middle position refers to adjacent functional layers in the middle position except two groups of adjacent functional layers on both sides, for example, in fig. 5, the OLED display device 01 and the circular polarizer 02, the circular polarizer 02 and the touch panel 03 can be regarded as adjacent functional layers in the middle position, that is, the double-sided adhesive film 100 can be disposed between the circular polarizer 02 and the touch panel 03, or the double-sided adhesive film 100 can be disposed between the circular polarizer 02 and the touch panel 03, so that the display device 01 and the touch panel 03 can be located in different systems, and further, damage to the display device 01 and the touch panel 03 is reduced.
Furthermore, all adjacent functional layers can be bonded by the double-sided adhesive film 100, so that the flexible display module has enough bending strain under proper stress to the maximum extent, the bending strength and the bending radius of the flexible display module are effectively guaranteed, and the reliability of the flexible display module is improved.
In addition, as shown in fig. 6, taking the above-mentioned adjacent functional layers as the first functional layer 10 and the second functional layer 20, and the first functional layer 10 and the second functional layer 20 are adhered by the double-sided adhesive film 100 as an example, the present invention preferably has a difference between the elastic modulus K2 at the position where the double-sided adhesive film 100 adheres the first functional layer 10 and the elastic modulus K1 of the first functional layer 10 less than 10Kpa, i.e., | K1-K2| ≦ 10; and/or the difference value between the elastic modulus K3 at the position where the double-sided adhesive film 100 is bonded with the second functional layer 20 and the elastic modulus K4 of the second functional layer 20 is less than 10Kpa, namely | K3-K4| ≦ 10.
Specifically, if the | K1-K2| is more than 10, the K1-K2 is more than 10, or the K2-K1 is more than 10; the difference between the elastic modulus K2 of the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 and the elastic modulus K1 of the first functional layer 10 is too large, on one hand, the adhesive force between the double-sided adhesive film 100 and the first functional layer 10 is small, and the bonding effect between the double-sided adhesive film 100 and the first functional layer 10 cannot be effectively ensured; on the other hand, in the case that K1-K2 > 10, the elastic modulus K2 of the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 is large, which causes the bending stress of the whole flexible module to be large, and is not beneficial to the bending of the flexible module, therefore, in the present invention, it is preferable that the difference between the elastic modulus K2 of the position where the double-sided 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 10Kpa, i.e., | K1-K2| ≦ 10.
Here, on the basis that the difference between the elastic modulus K2 at the position where the double-sided 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 10Kpa, that is, | K1-K2| ≦ 10, in order to further ensure the bending of the flexible display module, it is further preferable that the elastic modulus K2 at the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 is smaller than the elastic modulus K1 of the first functional layer 10, for example, the elastic modulus K2 at the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 is smaller than the elastic modulus K1 of the first functional layer 10 by 5 Kpa.
Also preferably, the difference between the elastic modulus K3 at the position where the double-sided 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 10Kpa, i.e. | K3-K4| ≦ 10; the elastic modulus K3 of the position where the double-sided adhesive film 100 is bonded to the second functional layer 20 is smaller than the elastic modulus K4 of the elastic modulus K4 of the second functional layer 20, and the specific reason is the same, which is not described herein again.
Here, the elastic modulus K2 at the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 may be equal to or different from the elastic modulus K3 at the position where the double-sided adhesive film 100 is bonded to the second functional layer 20, and the specific arrangement needs to be determined according to 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 the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 may be set to be equal to the elastic modulus K3 at the position where the double-sided adhesive film 100 is bonded to the second functional layer 20; of course, if the elastic moduli of the first functional layer 10 and the second functional layer 20 are not equal, as shown in fig. 3, the elastic modulus K2 at the position where the double-sided adhesive film 100 is bonded to the first functional layer 10 (a sub-film) may be set to be not equal to the elastic modulus K3 at the position where the double-sided adhesive film 100 is bonded to the second functional layer 20 (F sub-film); the invention is not so limited.
In the present invention, the double-sided adhesive film 100 preferably has a thickness of 50 to 400 μm.
Specifically, if the thickness of the double-sided adhesive film 100 is greater than 400 μm, the thickness of the whole double-sided adhesive film 100 is large, so that the thickness of the flexible display module bonded by the double-sided adhesive film 100 is too large, which does not conform to the current light and thin design concept of the display panel; if the thickness of the double-sided adhesive film 100 is less than 50 μm, the thickness of the double-sided adhesive film 100 is too small to effectively enable the flexible display module to have sufficient bending strain under appropriate stress, and therefore, the thickness of the double-sided adhesive film 100 is preferably 50 μm to 400 μm, for example, 100 μm to 350 μm.
On the basis, the elastic modulus of the double-sided adhesive film 100 is preferably distributed in the range of 10Kpa to 1000 Kpa.
Specifically, if the elastic modulus of the double-sided adhesive film 100 is greater than 1000Kpa, the bending strength and the bending radius of the whole flexible display module are adversely affected, which is not favorable for the bending strain of the flexible display module; if the elastic modulus of the double-sided adhesive film 100 is less than 10Kpa, the bonding force is limited, which is not favorable for bonding functional layers in the flexible display module, and therefore, the elastic modulus of the double-sided adhesive film 100 is preferably distributed in a range of 10Kpa to 1000Kpa, for example, may be in a range of 20Kpa to 600 Kpa.
The embodiment of the invention also provides a preparation method of the double-sided adhesive film, which comprises the following steps:
combining at least three layers of sequentially arranged sub-films into an integral double-sided adhesive film in a laminating way, wherein the elastic modulus of the at least three layers of sequentially arranged sub-films is distributed in a small middle and large two sides along the thickness direction O-O' of the double-sided adhesive film, and the elastic modulus of any position of the same sub-film is the same.
Specifically, taking ultraviolet light curing optical cement as an example, different liquid optical cements can be formed by mixing optical cement reagents with different proportions or different components through processes of stirring, defoaming and the like; then forming a liquid optical adhesive film on the substrate; finally, ultraviolet light is used for curing, and sub-films with different elastic moduli are respectively formed.
And then combining the sub-films with different elastic moduli into an integral double-sided adhesive film along the thickness direction O-O' according to the elastic moduli which are distributed with small middle and large two sides in a laminating way.
The embodiment of the invention also provides another preparation method of the double-sided adhesive film, which comprises the following steps:
and sequentially coating the adhesive materials with different elastic moduli according to the distribution sequence that the elastic moduli are firstly reduced and then increased to form the double-sided adhesive film.
Specifically, taking the ultraviolet light curing optical adhesive as an example, different liquid optical adhesives (adhesive films after ultraviolet light curing have different elastic moduli) can be formed by mixing optical adhesive reagents with different proportions or different components and by processes such as stirring, defoaming and the like.
And then, sequentially coating the substrate according to the distribution sequence that the elastic modulus is firstly reduced and then increased, and then curing by ultraviolet light to form the double-sided adhesive film.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The double-sided adhesive film is characterized in that the elastic modulus of the double-sided adhesive film is distributed in a small middle part and large two sides in the thickness direction of the double-sided adhesive film; the larger the elastic modulus of the double-sided adhesive film is, the larger the adhesive force is.
2. The double-sided adhesive film as claimed in claim 1, wherein the middle small distribution and the two side large distribution are gradually decreased and then increased.
3. The double-sided adhesive film as claimed in claim 1, wherein the middle small distribution and the two side large distributions are stepwise decreasing and increasing.
4. The double-sided adhesive film according to claim 3, wherein the double-sided adhesive film comprises at least three layers of sub-films in the thickness direction of the double-sided adhesive film, wherein the elastic modulus at any position of the same sub-film is the same.
5. The double-sided adhesive film according to any one of claims 1 to 4, wherein the double-sided adhesive film is made of an optical adhesive.
6. A flexible display module is characterized by comprising a plurality of functional layers, and at least one group of adjacent functional layers are bonded by the double-sided adhesive film according to any one of claims 1 to 5.
7. The flexible display module according to claim 6, wherein the flexible display module comprises at least three adjacent functional layers, wherein a group of adjacent functional layers located at a middle position in the at least three adjacent functional layers are bonded by the double-sided adhesive film;
or all the adjacent functional layers are bonded by the double-sided adhesive film.
8. The flexible display module according to claim 6, wherein 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 bonded by the double-sided adhesive film;
the difference value between the elastic modulus of the position where the double-sided adhesive film is bonded with the first functional layer and the elastic modulus of the first functional layer is smaller than or equal to 10Kpa, and/or the difference value between the elastic modulus of the position where the double-sided adhesive film is bonded with the second functional layer and the elastic modulus of the second functional layer is smaller than or equal to 10 Kpa.
9. The flexible display module of any one of claims 6-8,
the thickness of the double-sided adhesive film is 50-400 mu m;
and/or the elastic modulus of the double-sided adhesive film is distributed in the range of 10Kpa to 1000 Kpa.
10. The preparation method of the double-sided adhesive film is characterized by comprising the following steps:
combining at least three layers of sequentially arranged sub-films into a whole double-sided adhesive film in a laminating manner, wherein the elastic modulus of the at least three layers of sequentially arranged sub-films is distributed in a manner that the middle is small and the two sides are large along the thickness direction of the double-sided adhesive film, and the elastic modulus of any position of the same sub-film is the same;
or sequentially coating the adhesive materials with different elastic moduli according to the distribution sequence that the elastic moduli are firstly reduced and then increased to form the double-sided adhesive film.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710406174.1A CN107216819B (en) | 2017-06-01 | 2017-06-01 | Adhesive film, preparation method thereof and flexible display module |
| PCT/CN2018/086673 WO2018219129A1 (en) | 2017-06-01 | 2018-05-14 | Adhesive film and preparation method therefor, flexible display module |
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| CN201710406174.1A CN107216819B (en) | 2017-06-01 | 2017-06-01 | Adhesive film, preparation method thereof and flexible display module |
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| CN107216819A CN107216819A (en) | 2017-09-29 |
| CN107216819B true CN107216819B (en) | 2020-07-03 |
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| CN107216819B (en) * | 2017-06-01 | 2020-07-03 | 京东方科技集团股份有限公司 | Adhesive film, preparation method thereof and flexible display module |
| KR102171973B1 (en) * | 2017-11-03 | 2020-10-30 | 주식회사 엘지화학 | Multilayer adhesive tape |
| CN108230910A (en) * | 2018-01-26 | 2018-06-29 | 武汉华星光电半导体显示技术有限公司 | A kind of compound glue material structure and display screen |
| US10777755B2 (en) | 2018-01-26 | 2020-09-15 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Compound adhesive structure and a display panel |
| CN108735101B (en) * | 2018-05-28 | 2020-01-31 | 京东方科技集团股份有限公司 | Flexible display device |
| CN208240297U (en) * | 2018-06-26 | 2018-12-14 | 京东方科技集团股份有限公司 | A kind of flexible display apparatus |
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| CN109411624B (en) * | 2018-10-18 | 2021-04-20 | 京东方科技集团股份有限公司 | Double-sided adhesive film for flexible display panel, preparation method of double-sided adhesive film and flexible display panel |
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| CN110675755B (en) * | 2019-10-12 | 2021-08-24 | 武汉天马微电子有限公司 | Foldable display device |
| CN111415589A (en) * | 2020-04-02 | 2020-07-14 | 武汉华星光电半导体显示技术有限公司 | Flexible module |
| CN114067675B (en) * | 2020-08-07 | 2024-05-24 | 北京小米移动软件有限公司 | Folding screen, maintenance method thereof and electronic equipment |
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| CN107216819B (en) * | 2017-06-01 | 2020-07-03 | 京东方科技集团股份有限公司 | Adhesive film, preparation method thereof and flexible display module |
-
2017
- 2017-06-01 CN CN201710406174.1A patent/CN107216819B/en active Active
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2018
- 2018-05-14 WO PCT/CN2018/086673 patent/WO2018219129A1/en active Application Filing
Also Published As
| Publication number | Publication date |
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| CN107216819A (en) | 2017-09-29 |
| WO2018219129A1 (en) | 2018-12-06 |
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