CN109411624B - Double-sided adhesive film for flexible display panel, preparation method of double-sided adhesive film and flexible display panel - Google Patents
Double-sided adhesive film for flexible display panel, preparation method of double-sided adhesive film and flexible display panel Download PDFInfo
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- CN109411624B CN109411624B CN201811216145.XA CN201811216145A CN109411624B CN 109411624 B CN109411624 B CN 109411624B CN 201811216145 A CN201811216145 A CN 201811216145A CN 109411624 B CN109411624 B CN 109411624B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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- H—ELECTRICITY
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Abstract
The invention provides a double-sided adhesive film for a flexible display panel, a preparation method of the double-sided adhesive film and the flexible display panel. The double-sided adhesive film comprises a deformation area and a non-deformation area, wherein the viscoelasticity of the deformation area is superior to that of the non-deformation area, so that the stress absorption capacity of the deformation area is higher than that of the non-deformation area. The double-sided adhesive film deformation zone can well absorb the stress of the whole film layer pasted by the double-sided adhesive film during deformation, greatly relieves the stress concentration degree after the whole film layer pasted by the double-sided adhesive film is deformed for many times, and further greatly relieves the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film, so that the stress strain hysteresis effect of the double-sided adhesive film is greatly relieved, and the whole film layer pasted by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
Description
Technical Field
The invention relates to the technical field of display, in particular to a double-sided adhesive film for a flexible display panel, a preparation method of the double-sided adhesive film and the flexible display panel.
Background
Along with the development of the flexible folding display technology, the flexible folding display product, particularly the display product with smaller curvature radius, has the problem of poor reliability in a bending area, that is, in the flexible display product, under the condition that the two sides of a double-sided adhesive film used for adhering adjacent film layers or film layer structures have structural asymmetry and rigidity asymmetry, the problem of multiple bending stress concentration inevitably exists on the whole film layer adhered by the double-sided adhesive film, and then the integral plastic deformation accumulation of the film layer adhered by the double-sided adhesive film is caused, so that the stress strain hysteresis effect of the double-sided adhesive film is caused, and further the problem of structural failure is caused by weaker integral rigidity of the film layer adhered by the double-sided adhesive film, as shown in fig. 1A and fig. 1B.
Therefore, how to avoid the stress concentration of the bending region of each film layer in the frequent bending process of the flexible display product has become a problem to be solved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a double-sided adhesive film for a flexible display panel, a preparation method of the double-sided adhesive film and the flexible display panel. The double-sided adhesive film deformation zone can well absorb the stress of the whole film layer pasted by the double-sided adhesive film during deformation, greatly relieves the stress concentration degree after the whole film layer pasted by the double-sided adhesive film is deformed for many times, and further greatly relieves the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film, so that the stress strain hysteresis effect of the double-sided adhesive film is greatly relieved, and the whole film layer pasted by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
The invention provides a double-sided adhesive film for a flexible display panel, which comprises a deformation area and a non-deformation area, wherein the deformation area has viscoelasticity, and the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area, so that the stress absorption capacity of the deformation area is higher than that of the non-deformation area;
the width of the deformation area along the deformation direction is more than twice the curvature radius reached after the flexible display panel is deformed and less than twice the curvature radius +5mm reached after the flexible display panel is deformed.
Preferably, the viscoelastic relaxation time of the deformation zone is less than or equal to 1 ms.
Preferably, the Young's modulus of the deformation zone is less than 5 MPa.
Preferably, the deformation area is distributed in the middle area of the double-sided adhesive film, and the non-deformation area is distributed in the area outside the two opposite sides of the middle area.
Preferably, the double-sided adhesive film comprises an OCA optical adhesive film or a pressure-sensitive adhesive film.
The invention also provides a flexible display panel which comprises the double-sided adhesive film.
Preferably, the touch screen further comprises a back film, a base film, an OLED light-emitting unit film, an encapsulation film, a touch control film, a polarizing film and a protective film which are sequentially arranged along the first direction;
the double-sided adhesive film is arranged between the packaging film and the touch control film;
the double-sided adhesive film is arranged between the polarizing film and the protective film;
the double-sided adhesive film is arranged between the base film and the back film;
the double-sided adhesive film is the double-sided adhesive film;
the double-sided adhesive film between the packaging film and the touch control film and the double-sided adhesive film between the polarizing film and the protective film are OCA optical adhesive films;
the double-sided adhesive film between the base film and the back film is a pressure-sensitive adhesive film.
The invention also provides a preparation method of the double-sided adhesive film, which comprises the following steps: and carrying out viscoelasticity modulation treatment on the area of the raw material of the double-sided adhesive film, which corresponds to the deformation area, so that the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area of the double-sided adhesive film, and the capacity of the deformation area for absorbing stress is stronger than that of the non-deformation area for absorbing stress.
Preferably, the modulating the area of the double-sided adhesive film raw material corresponding to the deformation area comprises:
heating the area of the double-sided adhesive film raw material corresponding to the deformation area by adopting a hot plate heating method, wherein the heating temperature is 50-70 ℃, and the heating time is 25-35 minutes;
or when an area of the double-sided adhesive film corresponding to the deformation area is prepared, the double-sided adhesive film is doped with nanoparticles, wherein the nanoparticles are nanoparticles or silver nanoparticles of a material forming the deformation area.
The invention has the beneficial effects that: according to the double-sided adhesive film for the flexible display panel, the deformation area is divided into the deformation area and the non-deformation area with different viscoelasticity, the stress of the whole film layer pasted by the double-sided adhesive film can be well absorbed by the deformation area when the film layer is deformed, the stress concentration degree after the whole film layer pasted by the double-sided adhesive film is deformed for many times is greatly relieved, and then the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film is greatly relieved, so that the stress-strain hysteresis effect of the double-sided adhesive film is greatly relieved, and further the whole film layer pasted by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
According to the flexible display panel provided by the invention, by adopting the double-sided adhesive film, the stress of the flexible display panel during deformation can be better reduced, the stress concentration degree of the flexible display panel after multiple deformation is greatly relieved, the plastic deformation accumulation of the flexible display panel is greatly relieved, the flexible display panel rarely has structural failure, and the stress strain protection of the flexible display panel is ensured.
Drawings
FIGS. 1A and 1B are photographs showing the structural failure of the whole film adhered by a double-sided adhesive film in the prior art;
FIG. 1A is a photograph of a film layer on a double-sided adhesive film; FIG. 1B is a photograph of the film layer under the double-sided adhesive film;
FIG. 2 is a strain diagram of a conventional double-sided adhesive film after being bent 100 times;
fig. 3 is a bending strain diagram of the double-sided adhesive film in embodiment 2 after being bent 100 times;
FIG. 4 is a top view of the double-sided adhesive film in embodiment 2 of the present invention;
fig. 5 is a structural top view of a flexible display panel in embodiment 3 of the present invention;
fig. 6 is a structural cross-sectional view of the flexible display panel shown in fig. 5 along a cross-sectional line AA.
Wherein the reference numbers indicate:
1. a deformation region; 2. a non-deformation region; l, deformation direction; D. the width of the deformation region along the deformation direction; 3. a back film; 4. a base film; an OLED light-emitting unit film; 6. packaging the film; 7. a touch film; 8. a polarizing film; 9. a protective film; 10. double-sided adhesive films; 11. a frame; p. first direction.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail a double-sided adhesive film for a flexible display panel, a manufacturing method thereof, and a flexible display panel provided by the present invention with reference to the accompanying drawings and the detailed description.
The invention relates to a double-sided adhesive film design for a flexible display panel, in the prior patent, the whole viscoelasticity of the double-sided adhesive film for the flexible display panel is consistent, no special design is provided in a deformation area of the double-sided adhesive film, but tests show that under the condition that films or film structures on two sides of the double-sided adhesive film have asymmetric structures and asymmetric rigidity, the problem of multiple bending stress concentration inevitably exists in the whole film adhered by the double-sided adhesive film, and then the integral plastic deformation accumulation of the film adhered by the double-sided adhesive film is caused, so that the stress strain hysteresis effect of the double-sided adhesive film is caused, and the problem of structural failure is caused by weaker whole rigidity of the adhered film. In order to solve the problem of stress concentration of a deformation area of the double-sided adhesive film caused by the stress accumulation effect of the whole film layer stuck on the double-sided adhesive film after multiple bending, the double-sided adhesive film viscoelasticity partition design is adopted, namely the viscoelasticity of the deformation area is different from that of a non-deformation area, and the simulation shows that under the condition that the bending frequency is 2 s/time, the shaping accumulation caused by multiple bending stress concentration does not occur on the whole film layer stuck on the double-sided adhesive film.
Example 1:
the embodiment provides a double-sided adhesive film for a flexible display panel, which comprises a deformation area and a non-deformation area, wherein the deformation area has viscoelasticity, and the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area, so that the capacity of absorbing stress of the deformation area is stronger than that of absorbing stress of the non-deformation area.
The double-sided adhesive film is divided into a deformation area and a non-deformation area with different viscoelasticity, the deformation area can well absorb the stress of the whole film layer pasted by the double-sided adhesive film when deforming, the stress concentration degree after the whole film layer pasted by the double-sided adhesive film deforms for many times is greatly relieved, and then the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film is greatly relieved, so that the stress-strain hysteresis effect of the double-sided adhesive film is greatly relieved, and the whole film layer pasted by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
Example 2:
the embodiment provides a double-sided adhesive film for a flexible display panel, which comprises a deformation area and a non-deformation area, wherein the deformation area has viscoelasticity, and the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area, so that the capacity of absorbing stress of the deformation area is stronger than that of absorbing stress of the non-deformation area.
Wherein the viscoelastic relaxation time of the deformation zone is less than or equal to 1 ms. The Young modulus of the deformation area is less than 5 MPa. Preferably, the Young's modulus of the deformation zone is 1 to 5 MPa. The smaller the viscoelastic relaxation time, the faster the viscoelastic recovery speed of the deformation region under stress, and the better the viscoelastic recovery performance. The Young modulus is a physical quantity for describing the deformation resistance of the deformation region, is a representation of the difficulty degree of elastic deformation of the deformation region, and has a physical meaning of the force applied to the unit sectional area of the deformation region. The smaller the Young's modulus, the better the deformation performance and the stronger the ability to absorb stress.
As shown in fig. 2 and 3, the bending strain of the conventional double-sided adhesive film without viscoelastic partition is compared with that of the double-sided adhesive film with viscoelastic partition in the present embodiment after 100 times of bending with the same degree. As can be seen from fig. 2 and fig. 3, in this embodiment, after bending 100 times, the bending strain values of the upper and lower surfaces of the double-sided adhesive film with viscoelastic partition are much smaller than the bending strain values of the upper and lower surfaces of the existing double-sided adhesive film without viscoelastic partition, where the bending strain values of the upper surface are: (length after tangent deformation along the bending direction of the upper surface-length before deformation)/length before tangent deformation along the bending direction of the upper surface 100%, the bending strain value of the lower surface is: (length after the tangent line along the direction of buckling of lower surface deforms-length before the deformation)/length before the tangent line along the direction of buckling of lower surface deforms 100%, therefore, the double-sided adhesive film in this embodiment is divided into a deformation region and a non-deformation region with different viscoelasticity, and the deformation region can absorb the stress of the whole film layer pasted by the double-sided adhesive film when deforming well, thereby greatly relieving the stress concentration degree of the whole film layer pasted by the double-sided adhesive film after multiple deformations.
The deformation zone has the viscoelastic property, so that the stress of the whole film layer pasted by the double-sided adhesive film can be well absorbed when the film layer is deformed, the stress concentration degree after the whole film layer pasted by the double-sided adhesive film is deformed for many times is greatly relieved, the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film is greatly relieved, the stress-strain hysteresis effect of the double-sided adhesive film is greatly relieved, and the structural failure of the whole film layer pasted by the double-sided adhesive film is less caused; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
In this embodiment, as shown in fig. 4, the deformation region 1 is distributed in the middle region of the double-sided adhesive film, and the non-deformation region 2 is distributed in the regions outside the two opposite sides of the middle region.
Preferably, the width D of the deformation region 1 along the deformation direction L is greater than the curvature radius reached after the two times of deformation of the flexible display panel and is less than the curvature radius +5mm reached after the two times of deformation of the flexible display panel. The deformation zone 1 with the width can better absorb the stress of the whole film layer stuck by the double-sided adhesive film during deformation, greatly relieves the stress concentration degree after the whole film layer stuck by the double-sided adhesive film is deformed for many times, and further greatly relieves the integral plastic deformation accumulation of the film layer stuck by the double-sided adhesive film, so that the stress-strain hysteresis effect of the double-sided adhesive film is greatly relieved, and the whole film layer stuck by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
In this embodiment, the double-sided adhesive film includes an OCA optical adhesive film or a pressure-sensitive adhesive film. OCA optics glued membrane and pressure-sensitive glued membrane wide application are in flexible display panel (like flexible OLED display panel) for carry out laminating bonding with upper and lower rete, OCA optics glued membrane can also pass through the printing opacity simultaneously, and its luminousness can reach more than 90%, thereby can not influence flexible display panel's demonstration. In addition, the OCA optical adhesive film and the pressure-sensitive adhesive film have the viscoelastic performance, and can better absorb the stress of the flexible display panel which is adhered by the OCA optical adhesive film and the pressure-sensitive adhesive film during deformation, so that the stress concentration degree of the flexible display panel after multiple deformation is greatly relieved, the plastic deformation accumulation of the flexible display panel is greatly relieved, and the flexible display panel rarely has structural failure.
Based on the above structure and performance of the double-sided adhesive film, the embodiment further provides a preparation method of the double-sided adhesive film, which includes: and modulating the area of the raw material of the double-sided adhesive film, which corresponds to the deformation area, so that the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area of the double-sided adhesive film, and the capacity of absorbing stress of the deformation area is stronger than that of the non-deformation area.
Wherein, carry out the modulation to the region that corresponds deformation zone of two-sided glued membrane log material and handle and include:
and heating the area of the double-sided adhesive film raw material corresponding to the deformation area by adopting a hot plate heating method, wherein the heating temperature is 50-70 ℃, and the heating time is 25-35 minutes.
Or, another method may be adopted, namely, when the region corresponding to the deformation region of the double-sided adhesive film is prepared, the region is doped with nanoparticles, and the nanoparticles are nanoparticles of the material forming the deformation region or silver nanoparticles.
The above methods for performing viscoelastic modulation processing on the region of the double-sided adhesive film raw material corresponding to the deformation region are relatively mature technologies, and are not described herein again.
Advantageous effects of examples 1 to 2: the double-sided adhesive film for the flexible display panel provided in embodiment 1-2 is divided into the deformation region and the non-deformation region with different viscoelasticity, and the deformation region can well absorb the stress of the whole film layer pasted by the double-sided adhesive film when the film layer is deformed, so that the stress concentration degree after the whole film layer pasted by the double-sided adhesive film is deformed for many times is greatly alleviated, and then the integral plastic deformation accumulation of the film layer pasted by the double-sided adhesive film is greatly alleviated, thereby the stress-strain hysteresis effect of the double-sided adhesive film is greatly alleviated, and further the whole film layer pasted by the double-sided adhesive film rarely has structural failure; the viscoelastic partition design enables the double-sided adhesive film to have a good stress-strain isolation function, so that the stress-strain protection of the whole film layer adhered to the double-sided adhesive film is ensured.
Example 3:
the present embodiment provides a flexible display panel, as shown in fig. 5 and 6, including the double-sided adhesive film 10 of any one of embodiments 1 to 2.
The flexible display panel further comprises a back film 3, a base film 4, an OLED light-emitting unit film 5, an encapsulation film 6, a touch control film 7, a polarizing film 8 and a protection film 9 which are sequentially arranged along the first direction P. A double-sided adhesive film 10 is arranged between the packaging film 6 and the touch control film 7. A double-sided adhesive film 10 is arranged between the polarizing film 8 and the protective film 9; a double-sided adhesive film 10 is arranged between the base film 4 and the back film 3; a double-sided adhesive film 10 between the packaging film 6 and the touch control film 7 and a double-sided adhesive film 10 between the polarizing film 8 and the protective film 9 are OCA optical adhesive films; the double-sided adhesive film 10 between the base film 4 and the back film 3 is a pressure-sensitive adhesive film. The outer edge of the flexible display panel comprises a bezel 11. Since the flexible display panel emits light from the side where the protection film 9 is located, the double-sided adhesive film 10 between the packaging film 6 and the touch film 7 and the double-sided adhesive film 10 between the polarizing film 8 and the protection film 9 are OCA optical adhesive films, and normal display of the flexible display panel is not affected.
This flexible display panel can subdue the stress of flexible display panel when deformation better through adopting the double-sided glued membrane in embodiment 1-2, has greatly alleviated the stress concentration degree after this flexible display panel deformation many times, has greatly alleviated this flexible display panel's plastic deformation accumulation then, makes this flexible display panel appear the structural failure very few to the stress strain protection to this flexible display panel has been ensured.
The display device provided by the invention can be any product or component with a display function, such as an OLED panel, an OLED television, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A double-sided adhesive film for a flexible display panel comprises a deformation area and a non-deformation area, wherein the deformation area has viscoelasticity, and the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area, so that the stress absorption capacity of the deformation area is higher than that of the non-deformation area;
under the bending radius of 1mm, the width of the deformation area along the deformation direction is more than twice of the curvature radius reached by the deformed flexible display panel and less than two times of the curvature radius +5mm reached by the deformed flexible display panel;
the viscoelastic relaxation time of the deformation zone is less than or equal to 1 ms;
the Young modulus of the deformation area is less than 5 MPa.
2. The double-sided adhesive film as claimed in claim 1, wherein the deformation region is distributed in a middle region of the double-sided adhesive film, and the non-deformation region is distributed in regions other than opposite sides of the middle region.
3. The double-sided adhesive film of claim 1, wherein the double-sided adhesive film comprises an OCA optical adhesive film or a pressure-sensitive adhesive film.
4. A flexible display panel comprising the double-sided adhesive film according to any one of claims 1 to 3.
5. The flexible display panel according to claim 4, further comprising a back film, a base film, an OLED light emitting unit film, an encapsulation film, a touch film, a polarizing film, and a protective film sequentially arranged in a first direction;
the double-sided adhesive film is arranged between the packaging film and the touch control film;
the double-sided adhesive film is arranged between the polarizing film and the protective film;
the double-sided adhesive film is arranged between the base film and the back film;
the double-sided adhesive film is the double-sided adhesive film in claim 3;
the double-sided adhesive film between the packaging film and the touch control film and the double-sided adhesive film between the polarizing film and the protective film are OCA optical adhesive films;
the double-sided adhesive film between the base film and the back film is a pressure-sensitive adhesive film.
6. The method for preparing the double-sided adhesive film according to any one of claims 1 to 3, comprising the following steps: and modulating the area of the raw material of the double-sided adhesive film, which corresponds to the deformation area, so that the deformation capacity and the deformation recovery capacity of the deformation area are superior to those of the non-deformation area of the double-sided adhesive film, and the capacity of the deformation area for absorbing stress is stronger than that of the non-deformation area for absorbing stress.
7. The method for preparing a double-sided adhesive film according to claim 6, wherein the step of modulating the area of the raw material of the double-sided adhesive film corresponding to the deformation area comprises:
heating the area of the double-sided adhesive film raw material corresponding to the deformation area by adopting a hot plate heating method, wherein the heating temperature is 50-70 ℃, and the heating time is 25-35 minutes;
or when an area of the double-sided adhesive film corresponding to the deformation area is prepared, the double-sided adhesive film is doped with nanoparticles, wherein the nanoparticles are nanoparticles or silver nanoparticles of a material forming the deformation area.
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| CN201811216145.XA CN109411624B (en) | 2018-10-18 | 2018-10-18 | Double-sided adhesive film for flexible display panel, preparation method of double-sided adhesive film and flexible display panel |
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| CN201811216145.XA CN109411624B (en) | 2018-10-18 | 2018-10-18 | Double-sided adhesive film for flexible display panel, preparation method of double-sided adhesive film and flexible display panel |
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| CN110164310B (en) * | 2019-05-27 | 2022-04-26 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and display device |
| CN110570761A (en) * | 2019-08-15 | 2019-12-13 | 武汉华星光电半导体显示技术有限公司 | Flexible display module and flexible display device |
| CN111131570B (en) * | 2019-12-30 | 2021-11-30 | Oppo广东移动通信有限公司 | Display module for folding screen and electronic equipment thereof |
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| KR102187253B1 (en) * | 2013-11-28 | 2020-12-07 | 삼성디스플레이 주식회사 | Adhesive film and manufacturing method of the same, and display device including the adhesive film |
| KR102665776B1 (en) * | 2017-01-18 | 2024-05-16 | 삼성디스플레이 주식회사 | Adhesive member, display device including the same, and method of manufacturing the same |
| CN106847870B (en) * | 2017-03-10 | 2019-06-14 | 上海天马微电子有限公司 | Flexible display device |
| 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 |
| CN107230429B (en) * | 2017-06-08 | 2019-06-25 | 武汉天马微电子有限公司 | Flexible module and flexible display panel |
| CN107767775B (en) * | 2017-11-30 | 2020-05-19 | 广州国显科技有限公司 | Flexible display module |
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