CN109456708B - Adhesive film, packaging method of display panel and display device - Google Patents

Adhesive film, packaging method of display panel and display device Download PDF

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Publication number
CN109456708B
CN109456708B CN201811313115.0A CN201811313115A CN109456708B CN 109456708 B CN109456708 B CN 109456708B CN 201811313115 A CN201811313115 A CN 201811313115A CN 109456708 B CN109456708 B CN 109456708B
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Prior art keywords
layer
buffer
adhesive layer
adhesive
film
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CN201811313115.0A
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CN109456708A (en
Inventor
李俊
毛波
窦义坤
江昌俊
李宁宁
屈丽桃
李杰威
哈朗朗
徐阳
潘天峰
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to CN201811313115.0A priority Critical patent/CN109456708B/en
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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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive

Abstract

The invention provides an adhesive film, a packaging method of a display panel and a display device, and relates to the technical field of display. The adhesive film comprises: the main body glue layer, the buffer glue layer and the first protective layer are sequentially arranged along the thickness direction; one side of the main body adhesive layer, which is far away from the buffer adhesive layer, is used for being attached to an encapsulation film; the buffer glue layer is made of a glue material with reduced viscosity after being irradiated by ultraviolet light; the first protective layer is made of an ultraviolet light-permeable adhesive material. For encapsulating the display panel.

Description

Adhesive film, packaging method of display panel and display device
Technical Field
The invention relates to the technical field of display, in particular to an adhesive film, a display panel packaging method and a display device.
Background
Many Light Emitting devices for displaying are distributed in an OLED (Organic Light-Emitting Diode) panel, and the Light Emitting devices are corroded by water vapor, oxygen (i.e., water oxygen) and the like in the environment to affect the Light Emitting performance of the Light Emitting devices, so that the OLED panel needs to be packaged.
In the existing packaging technology, the metal film adopted in the metal packaging process has better water and oxygen barrier performance and is beneficial to realizing the lightness and thinness of the display device, so that the packaging technology occupies the leading position. The main process of the metal packaging process comprises the following steps: stripping the protective film on one side of the surface of the adhesive film to expose one side of the surface of the adhesive film, so that the adhesive film is attached to the surface of the metal film; and stripping the protective film on the other side of the surface of the adhesive film to expose the surface of the other side of the adhesive film, so that the metal film is attached to the surface of the display panel through the adhesive film, and the metal packaging of the display panel is completed.
However, in the prior art, after the adhesive film is attached to the metal film, because the adhesive property between the protective film on the other side and the adhesive film is strong, the adhesive film is easily partially or completely taken up by the protective film during peeling, so that the adhesive film is separated from the metal film, that is, poor peeling occurs, so that material waste is caused, and an equipment alarm is caused due to abnormal shutdown of the equipment, thereby affecting the production progress and the product yield.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an adhesive film, a packaging method for a display panel, and a display device, which can prevent a main body adhesive layer from being separated from a packaging film when a protective layer on the surface of the main body adhesive layer is peeled off when the adhesive film is used for packaging, so as to improve a production progress and a product yield.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an aspect of an embodiment of the present invention provides an adhesive film, including: the main body glue layer, the buffer glue layer and the first protective layer are sequentially arranged along the thickness direction; one side of the main body adhesive layer, which is far away from the buffer adhesive layer, is used for being attached to an encapsulation film; the buffer glue layer is made of a glue material with reduced viscosity after being irradiated by ultraviolet light; the first protective layer is made of an ultraviolet light-permeable adhesive material.
In some embodiments of the present invention, a surface of the buffer adhesive layer contacting the main body adhesive layer is a first surface, and a surface of the buffer adhesive layer contacting the first protection layer is a second surface; the adhesive film further comprises: and the light shielding layer exposes partial region of the second surface, so that the area of the region of the first surface irradiated by ultraviolet light is larger than that of the region of the second surface irradiated by ultraviolet light.
In some embodiments of the present invention, the light shielding layer includes a plurality of stripe portions arranged at intervals; or the light shielding layer is provided with a plurality of hollow parts which are arranged at intervals.
In some embodiments of the present invention, the light shielding layer is disposed on a side of the first protective layer away from the buffer glue layer; or the shading layer is a shading part formed after the frosting treatment is carried out on one side, far away from the buffer glue layer, of the first protection layer.
In some embodiments of the present invention, in a case where the light shielding layer is disposed on a side of the first protective layer away from the buffer glue layer, the light shielding layer is made of a colored coating material.
In some embodiments of the present invention, after the buffer adhesive layer is irradiated by ultraviolet light, the viscosity is reduced by more than or equal to 50%.
In some embodiments of the invention, after the buffer adhesive layer is irradiated by ultraviolet light, the peel strength of the first surface separated from the main adhesive layer is less than or equal to 20g/25mm, and the peel strength of the second surface separated from the first protective layer is greater than or equal to 100g/25 mm.
In some embodiments of the present invention, on the second surface, a transmittance of ultraviolet light in a region covered by the light shielding layer is less than or equal to 20%; the transmittance of the ultraviolet light in the area not covered by the shading layer is more than or equal to 70 percent.
In some embodiments of the invention, further comprising: the second protective layer is arranged on one side, far away from the buffer glue layer, of the main glue layer; and the release force of the second protective layer is smaller than that of the first protective layer.
In another aspect, an embodiment of the present invention provides a method for packaging a display panel, including the following steps: s1: providing an encapsulation film and a display panel; s2: attaching the main adhesive layer in the adhesive film to the surface of the packaging film; s3: irradiating the adhesive film by ultraviolet light on one side of the first protective layer in the adhesive film so as to reduce the viscosity of the buffer adhesive layer in the adhesive film; s4: separating the whole body comprising the first protective layer and the buffer adhesive layer with reduced viscosity from the main body adhesive layer to expose one side of the main body adhesive layer away from the packaging film; s5: and enabling one side of the main body adhesive layer, which is far away from the packaging film, to be attached to the display panel.
In some embodiments of the present invention, in the case that the adhesive film includes the light shielding layer, the step S3 includes: make the ultraviolet light be in the glued membrane first protective layer one side, it is right through the light shield layer in the glued membrane the region that is not covered by the light shield layer on the buffer glue layer is shone, so that the viscosity of buffer glue layer reduces, just be close to in the buffer glue layer the range that the viscosity of first surface part reduces is greater than be close to in the buffer glue layer the range that the viscosity of second surface part reduces.
In some embodiments of the present invention, in the case that the adhesive film does not include the light shielding layer, step S3 includes: placing a light shielding plate above one side, away from the buffer adhesive layer, of the first protective layer in the adhesive film, wherein the light shielding plate exposes a partial area of the second surface, so that the area of the area, irradiated by ultraviolet light, of the first surface is larger than the area of the area, irradiated by ultraviolet light, of the second surface; the first surface is the surface of the buffer adhesive layer, which is in contact with the main body adhesive layer, and the second surface is the surface of the buffer adhesive layer, which is in contact with the first protective layer; and irradiating the area, which is not covered by the light shielding plate, on the second surface of the buffer adhesive layer by using the light shielding plate to enable ultraviolet light to be on one side of the first protective layer, so that the viscosity of the buffer adhesive layer is reduced, and the reduction amplitude of the viscosity of the part, close to the first surface, in the buffer adhesive layer is larger than the reduction amplitude of the viscosity of the part, close to the second surface, in the buffer adhesive layer.
In some embodiments of the present invention, before performing step S2, the method for packaging a display panel further includes the following steps: and separating the second protective layer from the main body adhesive layer in the adhesive film to expose one side of the main body adhesive layer far away from the buffer adhesive layer.
Another aspect of an embodiment of the present invention provides a display device, including: the display panel, the packaging film and the main body adhesive layer are packaged by adopting the packaging method of the display panel.
Based on this, according to the adhesive film provided by the embodiment of the invention, a buffer adhesive layer is added between the main adhesive layer and the first protective layer as a transition layer. After one side laminating that keeps away from the buffering glue film when the main part glue film is on the packaging film, because this buffering glue film is made by the gluey material that receives ultraviolet irradiation back viscosity reduction, see through first protective layer and carry out the UV light irradiation to the buffering glue film, can reduce the viscosity of buffering glue film, be convenient for separate whole and the main part glue film that constitutes buffering glue film and first protective layer, avoid taking the part of main part glue film or whole when peeling off to can guarantee that the buffering glue film is firmly laminated on the packaging film.
Therefore, when the adhesive film provided by the embodiment of the invention is used for packaging, the waste of materials such as adhesive materials, protective films and the like and equipment alarm caused by abnormal shutdown of equipment can be avoided or reduced, so that the production progress and the product yield can be 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 step-by-step diagram illustrating a packaging method for packaging a display panel according to the related art;
FIG. 2 is a schematic cross-sectional view of an adhesive film according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of another adhesive film according to an embodiment of the present invention;
FIG. 4 is a schematic view of another adhesive film according to an embodiment of the present invention, showing a cross-sectional structure along a thickness direction and a UV light irradiation principle;
FIG. 5 is a schematic view of a cross-sectional structure of another adhesive film along a thickness direction and a UV light irradiation principle according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a light-shielding layer in an adhesive film according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for packaging a display panel according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating another method for packaging a display panel according to an embodiment of the present invention;
FIG. 9 is a schematic step-by-step diagram illustrating a packaging method for a display panel according to an embodiment of the present invention;
FIG. 10 is a schematic step-by-step diagram illustrating another method for packaging a display panel according to an embodiment of the present invention;
fig. 11 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Reference numerals:
1A-a display device; 02-encapsulation film/metal film; 03-a display panel; 04-light screen;
01' -glue film; 10' -glue layer; 11' -upper protective film (heavy release protective film); 12' -lower protective film (light release protective film);
01-glue film; 10-main glue layer; 11-a buffer glue layer; 110-a reduced viscosity fraction;
11 a-a first surface; 11 b-a second surface; 12-a first protective layer; 13-a second protective layer;
14-light shielding layer/light shielding portion; 14 a-strip; d 1-spacing; 14 b-a hollowed-out; d 2-spacing.
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.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
For example, the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. Terms of orientation or positional relationship indicated by "upper/upper", "lower/lower", "row/row direction", and "column/column direction" and the like are terms based on the orientation or positional relationship shown in the drawings, and are only for the purpose of simplifying the description of the technical solution of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be construed as limiting the present invention.
For example, in some cases, embodiments involving "row direction" may be implemented in the case of "column direction" and so on, and vice versa. It is also within the scope of the claims to rotate or mirror the versions described in this patent by 90 °.
In the related art, as shown in fig. 1, an adhesive film 01' used in a metal encapsulation process is generally composed of three layers, that is: the glue layer 10', an upper protective film 11' and a lower protective film 12 'which are respectively attached to two sides of the glue layer 10'; wherein, the release force of the upper protection film 11 'is greater than that of the lower protection film 12', that is, the adhesion between the upper protection film 11 'and the glue layer 10' is greater than that between the lower protection film 12 'and the glue layer 10'.
Here, the "release force" refers to a force required for separating the surface of the protective film (e.g., a pressure sensitive adhesive base paper) from the surface of the adhesive layer (e.g., an adhesive), and can be classified into light, medium and heavy release forces according to the magnitude of the force required for separation.
Thus, the upper protective film 11' having a heavy release force is a so-called heavy release protective film; in contrast, the lower protective film 12' having a light release force is a so-called light release protective film.
Referring to fig. 1, in the related art, the specific process of the metal packaging process includes:
firstly, peeling the light release protective film 12' on one side of the adhesive layer 10' from the adhesive layer 10' to expose one side of the adhesive layer 10' covered by the light release protective film 12', and attaching the side to the surface of the metal film 02; the heavy release protective film 11' on the other side of the adhesive layer 10' is peeled off from the adhesive layer 10' to expose the surface of the adhesive layer 10' covered by the heavy release protective film 11', and the surface is attached to the display panel 03, thereby completing the metal packaging of the display panel 03.
When the light release protection film 12 'on one side of the adhesive layer 10' is peeled off, in order to facilitate the subsequent bonding operation between the adhesive layer 10 'and the metal film 02, the heavy release protection film 11' on the other side of the adhesive layer 10 'needs to be reserved, that is, the adhesive layer 10' and the heavy release protection film 11 'are required not to be separated, that is, the heavy release protection film 11' should have a large release force; however, before attaching the metal film 02 to the display panel 03, the heavy release protective film 11' on the other side of the adhesive layer 10' needs to be peeled off, and in order to prevent the adhesive layer 10' from being separated from the metal film 03 by lifting up part or all of the adhesive layer 10' during peeling, the heavy release protective film 11' should have a small release force.
In order to improve the release force, the conventional heavy release protective film generally adopts the processes of increasing the thickness, performing plasma treatment on the surface, coating fluorine (or silicon) on the surface and the like, but the processes have no controllability and cannot meet the requirements on the release force of the heavy release protective film at different stages in the metal packaging process.
In view of this, the first aspect of the embodiments of the present invention provides an adhesive film, as shown in fig. 2, the adhesive film (also referred to as a packaging adhesive film) 01 includes the following structure: the main body glue layer 10, the buffer glue layer 11 and the first protective layer 12 are sequentially arranged along the thickness direction; wherein, one side of the main adhesive layer 10 far away from the buffer adhesive layer 11 is used for being jointed with the packaging film; the buffer glue layer 11 is made of a glue material with reduced viscosity after being irradiated by ultraviolet light; the first protective layer 12 is made of a glue material that is transparent to ultraviolet light.
It should be noted that the so-called "body adhesive layer" is a main portion of the adhesive film 01, and a side of the body adhesive layer 10 away from the buffer adhesive layer 11 is used for adhering to an encapsulation film (such as a metal film) used in an encapsulation process of the display panel.
The buffer adhesive layer 11 is made of an adhesive material whose viscosity decreases after being irradiated with Ultraviolet light (UV). That is, after the adhesive material is irradiated by UV light, the structure of the adhesive material is changed, so that the viscosity of the adhesive material is reduced.
The first protective layer 12 is a structure that protects the underlying structure and needs to be peeled off in the subsequent process of packaging the display panel, and is a release film (also referred to as a release protective film).
When the buffer adhesive layer 11 is irradiated with UV light, the light is transmitted from the side of the first protective layer 12 to irradiate it, and therefore, the first protective layer 12 is made of an adhesive material that is transparent to UV light, and the thickness of the first protective layer 12 should be as thin as possible to facilitate the transmission of UV light.
In the related art, after one side of the adhesive layer 10' is attached to the metal film 02, the heavy release protective film 11' on the other side of the adhesive layer 10' is directly peeled off, and since the heavy release protective film 11' and the adhesive layer 10' have strong adhesion, the direct peeling method may cause the peeled heavy release protective film 11' to lift up part or even all of the adhesive layer 10', thereby causing poor packaging.
Based on this, the adhesive film 01 provided by the embodiment of the invention adds a buffer adhesive layer 11 as a transition layer between the main adhesive layer 10 and the first protective layer 12. After one side laminating that keeps away from buffer glue layer 11 when main part glue film 10 is on the packaging film, because this buffer glue layer 11 is made by the gluey material that receives ultraviolet irradiation back viscosity reduction, see through first protective layer 12 and carry out the UV light irradiation to buffer glue layer 11, can reduce buffer glue layer 11's viscosity, be convenient for separate buffer glue layer 11 and the whole and main part glue film 10 that first protective layer 12 constitutes, avoid taking up the part of main part glue film 10 or whole when peeling off, thereby can guarantee that main part glue film 10 firmly laminates on the packaging film.
Therefore, when the adhesive film provided by the embodiment of the invention is used for packaging, the waste of materials such as adhesive materials, protective films and the like and equipment alarm caused by abnormal shutdown of equipment can be avoided or reduced, so that the production progress and the product yield can be improved.
On the basis, in order to facilitate the production and transportation of the adhesive film 01, as shown in fig. 3, the adhesive film 01 further includes: the second protective layer 13 is arranged on one side of the main glue layer 10 far away from the buffer glue layer 11; the release force of the second protection layer 13 is smaller than the release force of the first protection layer 12.
That is, the first protective layer 12 may be exemplified by a heavy release type protective film, and the second protective layer 13 may be exemplified by a light release type protective film, in contrast.
It can be understood that, because the second protective layer 13 is disposed on the side of the main adhesive layer 10 away from the buffer adhesive layer 11, when performing the packaging process, the main adhesive layer 10 and the second protective layer 13 are separated to expose the side of the main adhesive layer 10 away from the buffer adhesive layer 11, and then the main adhesive layer 10 is attached to the packaging film for packaging.
For example, after the buffer adhesive layer 11 is irradiated by the UV light, the viscosity is reduced by more than or equal to 50%, preferably by more than 80%, so as to separate the whole body formed by the buffer adhesive layer 11 and the first protective layer 12 from the main adhesive layer 10.
As for the adhesive material of which the viscosity is reduced after being irradiated with UV light, which is used to form the above-mentioned cushion adhesive layer 11, for example, the adhesive material may be a UV tack-reducing adhesive, that is: is prepared from main components such as an adhesive (also called glue), an ultraviolet light initiator, a cross-linking agent and the like; wherein, the adhesive can be one or a mixture of more than two of conventional adhesives such as acrylic adhesive, polyurethane adhesive, rubber, epoxy adhesive, silica gel and the like; the crosslinking agent contains unsaturated double bonds which can be polymerized by ultraviolet initiation. After the adhesive material is irradiated by UV light, unsaturated double bonds contained in the cross-linking agent can be polymerized with an ultraviolet initiator, so that the structure of the adhesive material is changed, and the viscosity is reduced.
Alternatively, the adhesive material may be a temporary bonding adhesive material in the related art, and when UV light (e.g., ultraviolet laser) with a higher energy density is irradiated on the temporary bonding adhesive material, due to the high photon energy of the ultraviolet laser, the chemical bond of the bonding adhesive material can be broken, so that the viscosity of the bonding adhesive material is reduced (or even the adhesion is lost).
Or, the glue material can also be photoresist which is changed into a glue material which can be dissolved in a developing solution after being irradiated by UV light, thereby losing viscosity.
Moreover, the thickness of the buffer adhesive layer 11 may be in the order of micrometers (e.g., tens of micrometers to hundreds of micrometers), and the order of magnitude of thickness is suitable, so that a relatively firm adhesion between the buffer adhesive layer 11 and the first protective layer 12 before the UV light is irradiated can be ensured, and meanwhile, the transmission of the UV light is facilitated, and the effect of viscosity reduction due to an excessive thickness is avoided.
For convenience of description, as shown in fig. 4 or 5, a surface of the cushion adhesive layer 11 contacting the main adhesive layer 10 is referred to as a first surface 11a, and a surface of the cushion adhesive layer 11 contacting the first protective layer 12 is referred to as a second surface 11 b.
To further reduce the difficulty in peeling off the first protection layer 12, please refer to fig. 4 or fig. 5, the adhesive film 01 further includes: and a light shielding layer 14, wherein the light shielding layer 14 exposes a partial region of the second surface 11b, so that the area of the region of the lower first surface 11a irradiated by the UV light is larger than the area of the region of the upper second surface 11b irradiated by the UV light.
Since the light-shielding layer 14 shields a part of the exposed region of the second surface 11b, that is, the second surface 11b to a small extent, the region covered with the light-shielding layer 14 on the upper second surface 11b is directly covered with the light-shielding layer 14, and thus the region can be irradiated with UV light to a very small extent (or not irradiated with UV light at all).
On the lower first surface 11a, by utilizing diffraction of light and transmittance of the buffer adhesive layer 11 to UV light, when the buffer adhesive layer 11 is irradiated by the UV light through the first protective layer 12, diffusion and overlapping occur (the light diffusion and overlapping manner is shown by a dotted line in fig. 4 or fig. 5), not only can the region on the first surface 11a corresponding to the partial region of the second surface 11b exposed by the light shielding layer 14 be irradiated by the UV light, but also the region below the region covered by the light shielding layer 14 can be irradiated by the UV light, so that the portion 110 of the buffer layer 11 with reduced viscosity after being irradiated by the UV light has a trapezoid-like structure with a small area near the second surface 11b and a large area near the first surface 11a, that is, the area of the region where the lower first surface 11a is irradiated with UV light is made larger than the area of the region where the upper second surface 11b is irradiated with UV light.
That is, the light-shielding layer 14 achieves selective viscosity reduction of different regions of the buffer adhesive layer 11, and solves the problem that the release force can only be increased or reduced unilaterally by using a plasma treatment or other methods in the related art.
In this way, since the area of the region where the lower first surface 11a is irradiated with the UV light is larger than the area of the region where the upper second surface 11b is irradiated with the UV light, the viscosity of the portion of the cushion paste layer 11 close to the lower first surface 11a is reduced by a larger amount than the viscosity of the portion of the cushion paste layer 11 close to the upper second surface 11 b.
That is, the adhesion between the buffer glue layer 11 and the first protective layer 12 after the UV light irradiation is made larger than the adhesion between the buffer glue layer 11 and the body glue layer 10. Therefore, the separation of the whole formed by the buffer adhesive layer 11 and the first protective layer 12 from the main body adhesive layer 10 is facilitated, and the main body adhesive layer 10 is prevented from being partially or completely taken up during peeling, so that the main body adhesive layer 10 can be ensured to be attached to the packaging film more firmly.
For example, on the second surface 11b where the buffer adhesive layer 11 and the first protective layer 12 are in contact, the transmittance of the UV light in the region covered by the light shielding layer 14 is not more than 20%, and the transmittance of the UV light in the region not covered by the light shielding layer 14 is not less than 70%, so that after the UV light irradiates the buffer adhesive layer 11 through the light shielding layer 14, the difference between the extent of the viscosity reduction of the portion of the first surface 11a close to the lower side in the buffer adhesive layer 11 and the extent of the viscosity reduction of the portion of the second surface 11b close to the upper side in the buffer adhesive layer 11 is as large as possible, thereby making it easier to separate the whole formed by the buffer adhesive layer 11 and the first protective layer 12 from the main adhesive layer 10.
For example, after the buffer adhesive layer 11 is irradiated by UV light, the peel strength of the first surface 11a separated from the main adhesive layer 10 is less than or equal to 20g/25mm, which is equivalent to the peel strength level when peeling off the conventional light release protective film (i.e. the buffer adhesive layer 11 and the main adhesive layer 10 can be separated easily); the peel strength of the second surface 11b and the first protective layer 12 is greater than or equal to 100g/25mm, which is equivalent to the level of peel strength when peeling the conventional heavy release protective film (i.e. it is difficult to easily separate the buffer adhesive layer 11 and the first protective layer 12), thereby ensuring that the whole of the first protective layer 12 and the buffer adhesive layer 11 can be easily peeled.
The term "peel strength" refers to the maximum force required to peel the materials (for example, the cushion adhesive layer 11 and the body adhesive layer 10, the cushion adhesive layer 11 and the first protective layer 12 in the present embodiment) from the contact surface by a unit width, and the angle at which the materials are peeled is 90 ° or 180 °, which reflects the adhesive strength between the materials.
A common unit for peel strength is Newton per meter (N/m), and in practice, for ease of measurement, the peel strength is often characterized in units of "g/25 mm" as described above, i.e. expressed as: tape width 25mm (i.e. "mm"), peel force required (i.e. "g").
Referring to fig. 4, in the adhesive film 01 provided in the embodiment of the invention, the light shielding layer 14 may be disposed on a side of the first protective layer 12 away from the buffer adhesive layer 11, that is, the light shielding layer 14 is separately disposed on the first protective layer 12.
The light shielding layer 14 may be a dark light shielding structure made of a colored coating material (including at least one of a metal coating, an inorganic coating, and an organic coating), and the specific material is not limited, and may be any material capable of shielding UV light.
Alternatively, referring to fig. 5, in the adhesive film 01 provided in the embodiment of the present invention, the light shielding layer 14 may also be a light shielding portion formed by performing a sanding process on a side of the first protective layer 12 away from the buffer adhesive layer 11. The specific degree of the frosting treatment is not limited as long as the UV light can be blocked.
Further, as shown in fig. 6 (a), the light-shielding layer 14 includes a plurality of stripe portions 14a arranged at intervals.
Here, the term "spaced arrangement" means that a certain distance d1 is provided between two adjacent strips 14 a.
Note that the planar shape of the strip portion 14a includes, but is not limited to, a long rectangular shape shown in fig. 6 (a), and may also be a long wavy shape. Also, the plurality of stripe portions 14a may be arranged at intervals in the column direction as shown in fig. 6, and may also be arranged at intervals in the row direction or other directions; the distance d1 between any two adjacent strips 14a may be the same or different.
The planar shape, number and arrangement of the stripe portions 14a are not limited in the embodiment of the present invention, as long as it is beneficial to make the area of the region of the lower first surface 11a irradiated by the UV light larger than the area of the region of the upper second surface 11b irradiated by the UV light, and fig. 6 is only an illustration.
For example, as shown in part (b) or part (c) of fig. 6, the light-shielding layer 14 has a plurality of hollow portions 14b arranged at intervals, that is, the light-shielding layer 14 is a whole layer, and a plurality of hollow portions 14b are formed thereon.
Here, the term "spaced arrangement" means that a certain distance d2 is provided between two adjacent hollow portions 14 b.
It should be noted that the planar shape of the hollow portion 14b includes, but is not limited to, a rectangle shown in part (b) of fig. 6, a circle shown in part (c) of fig. 6, and may also be other planar shapes such as a triangle, a diamond, and the like. Moreover, the planar patterns of the hollow portions 14b may be in the same shape or different shapes, and the planar patterns of the hollow portions 14b may have the same or different areas.
In the embodiment of the present invention, the planar shape, the number and the arrangement of the hollow portions 14b are not limited, as long as it is favorable to make the area of the region of the lower first surface 11a irradiated by the UV light larger than the area of the region of the upper second surface 11b irradiated by the UV light, and fig. 6 is only an illustration.
Further, a second aspect of the embodiments of the present invention provides a method for packaging a display panel, as shown in fig. 7, including the following steps S1-S5:
s1: providing an encapsulation film and a display panel;
s2: attaching the main adhesive layer in the adhesive film of each embodiment to the surface of the packaging film;
s3: irradiating the adhesive film by ultraviolet light at one side of the first protective layer in the adhesive film to reduce the viscosity of the buffer adhesive layer in the adhesive film;
s4: separating the whole body comprising the first protective layer and the buffer adhesive layer with reduced viscosity from the main body adhesive layer to expose one side of the main body adhesive layer away from the packaging film;
s5: and attaching one side of the main body adhesive layer, which is far away from the packaging film, to the display panel.
The encapsulation film may be, for example, a metal film.
The whole formed by the packaging film and the main body adhesive layer is a packaging structure, such as a metal packaging structure.
The beneficial effects that can be achieved by the packaging method of the display panel are the same as those that can be achieved by the adhesive film provided by the first aspect of the embodiment of the invention, and are not described again here.
It should be noted that, although the above-mentioned packaging method for a display panel provided in the embodiment of the present invention is described by taking a structure to be packaged as a display panel (such as an OLED display panel), any application that uses the method to package a device sensitive to the environment (such as moisture and oxygen) falls within the protection scope of the present invention.
On the basis of the above, as shown in fig. 8, before performing step S2, the method for packaging a display panel further includes the following step S2':
s2': separating the second protective layer from the main adhesive layer in the adhesive film to expose the surface of the main adhesive layer away from the buffer adhesive layer;
that is, the side of the main adhesive layer away from the cushion adhesive layer 11 is bonded to the sealing film for sealing. Among them, the first protective layer may be exemplified by a heavy release type protective film, and the opposite, the second protective layer may be exemplified by a light release type protective film.
In the above steps, the separation method includes, but is not limited to, separating the bonded two structures by peeling.
Two examples are provided below for a detailed description of the encapsulation process described above.
In the case that the adhesive film includes a light-shielding layer, as shown in fig. 9, the method for packaging the display panel specifically includes the following steps a 1-a 5:
a1: providing an encapsulation film 02 and a display panel 03;
a2': separating the second protection layer 13 in the adhesive film 01 from the main adhesive layer 10 to expose a side of the main adhesive layer 10 away from the buffer adhesive layer 11;
a2: attaching one side of the main adhesive layer 10, which is far away from the buffer adhesive layer 11, to the surface of the packaging film 02;
a3: irradiating the area, which is not covered by the light shielding layer 14, of the buffer adhesive layer 11 in the adhesive film 01 through the light shielding layer 14 by using UV light on the side of the first protective layer 12 in the adhesive film 01 so as to reduce the viscosity of the buffer adhesive layer 11, wherein the reduction range of the viscosity of the part, close to the first surface 11a, of the buffer adhesive layer 11 is larger than the reduction range of the viscosity of the part, close to the second surface 11b, of the buffer adhesive layer 11;
wherein, the surface of the buffer adhesive layer 11 contacting with the main body adhesive layer 10 is a first surface 11a, and the surface of the buffer adhesive layer 11 contacting with the first protective layer 12 is a second surface 11 b; for the detailed structure and function of the light-shielding layer 14, please refer to the above description, and further description is omitted here.
A4: separating the whole body including the first protective layer 12 and the buffer adhesive layer 11 with reduced viscosity from the main adhesive layer 10 to expose the side of the main adhesive layer 10 away from the packaging film 02;
a5: one side of the main adhesive layer 10, which is far away from the packaging film 02, is attached to the display panel 03, so that the display panel is packaged.
It should be noted that fig. 9 only illustrates that the light-shielding layer 14 is disposed on the side of the first protective layer 12 away from the buffer adhesive layer 11, and the above-mentioned packaging method is also applicable to the case that the light-shielding layer 14 may also be a light-shielding portion formed after performing a frosting process on the side of the first protective layer 12 away from the buffer adhesive layer 11, and is not described again here.
In the case that the adhesive film does not include the light shielding layer, as shown in fig. 10, the method for packaging the display panel specifically includes the following steps B1-B5:
b1: providing an encapsulation film 02 and a display panel 03;
b2': separating the second protection layer 13 in the adhesive film 01 from the main adhesive layer 10 to expose a side of the main adhesive layer 10 away from the buffer adhesive layer 11;
b2: attaching one side of the main adhesive layer 10, which is far away from the buffer adhesive layer 11, to the surface of the packaging film 02;
b3: placing a light shielding plate 04 above the side, away from the buffer glue layer 11, of the first protective layer 12 in the glue film 01, wherein the light shielding plate 04 exposes a partial area of the second surface 11b, so that the area of the area, irradiated by the UV light, of the first surface 11a is larger than that of the area, irradiated by the UV light, of the second surface 11 b; the first surface 11a is a surface of the buffer adhesive layer 11 contacting with the main body adhesive layer 10, and the second surface 11b is a surface of the buffer adhesive layer 11 contacting with the first protective layer 12;
irradiating the area, which is not covered by the light shielding layer 14, of the buffer adhesive layer 11 in the adhesive film 01 by using a light shielding plate 04 on the side of the first protective layer 12 in the adhesive film 01 by using UV light so as to reduce the viscosity of the buffer adhesive layer 11, wherein the reduction range of the viscosity of the part, which is close to the first surface 11a, in the buffer adhesive layer 11 is larger than the reduction range of the viscosity of the part, which is close to the second surface 11b, in the buffer adhesive layer 11;
b4: separating the whole body including the first protective layer 12 and the buffer adhesive layer 11 with reduced viscosity from the main adhesive layer 10 to expose the side of the main adhesive layer 10 away from the packaging film 02;
b5: one side of the main adhesive layer 10, which is far away from the packaging film 02, is attached to the display panel 03, so that the display panel is packaged.
The function of the light shielding plate 04 is the same as that of the light shielding layer 14 illustrated in fig. 9, and the difference is that the light shielding plate 04 illustrated in fig. 10 is an auxiliary tool independent from the adhesive film 01, and the light shielding layer 14 illustrated in fig. 9 is a part of the adhesive film 01.
Referring to fig. 6, the light shielding plate 04 may also be formed by a plurality of strip-shaped portions arranged at intervals, or the light shielding plate 04 has a plurality of hollow-out portions arranged at intervals, and the specific structure can be referred to the above description of the light shielding layer 14, and is not described herein again.
It should be noted that, the step numbers shown in the packaging methods of the display panel provided in the embodiments of the present invention are only numbers for convenience of description, and do not strictly represent actual step sequences. It is within the ability of one skilled in the art to modify the order of steps after learning the teachings of embodiments of the present invention and such modifications are within the scope of the present invention as disclosed herein.
A third aspect of the embodiments of the present invention provides a display device, as shown in fig. 11, the display device 1A including: the display panel 03, the packaging film 02 and the main adhesive layer 10 are packaged by the above-mentioned packaging method for each display panel.
The sealing film 02 may be a metal film, for example.
The beneficial effects that can be achieved by the display device are the same as those that can be achieved by the packaging method of the display panel provided by the second aspect of the embodiment of the present invention, and are not described herein again.
It should be noted that, because the metal film has a low light transmittance, when the display panel 03 is specifically an OLED display panel, light emitted from the OLED display panel is emitted from a side away from the metal film, that is, an OLED device in the OLED display panel is a bottom emission type, and emitted light is emitted from a side of a substrate on which the OLED device is disposed.
The above-described display device provided by the embodiments of the present invention may be any device that displays an image, whether in motion (e.g., video) or stationary (e.g., still image), and whether textual or pictorial. More particularly, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices including, but not limited to, mobile telephones, wireless devices, personal data assistants (PAD for short), handheld or Portable computers, GPS (Global Positioning System) receivers/navigators, cameras, MP4 (all MPEG-4 Part 14) video players, video cameras, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, auto displays (e.g., odometer display, etc.), navigators, cockpit controls and/or displays, displays of camera views (e.g., of rear view cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, electronic signage, and/or other electronic devices, Architectural structures, packaging, and aesthetic structures (e.g., for a display showing an image of a piece of jewelry), and the like.
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 (11)

1. An adhesive film, comprising:
the main body glue layer, the buffer glue layer and the first protective layer are sequentially arranged along the thickness direction;
one side of the main body adhesive layer, which is far away from the buffer adhesive layer, is used for being attached to an encapsulation film;
the buffer glue layer is made of a glue material with reduced viscosity after being irradiated by ultraviolet light;
the first protective layer is made of an ultraviolet light-permeable glue material;
one surface of the buffer adhesive layer, which is in contact with the main body adhesive layer, is a first surface, and one surface of the buffer adhesive layer, which is in contact with the first protective layer, is a second surface;
the adhesive film further comprises: the light shielding layer is arranged on one side, far away from the buffer glue layer, of the first protective layer; or the shading layer is a shading part formed by performing frosting treatment on one side of the first protective layer, which is far away from the buffer glue layer;
the light shielding layer exposes partial area of the second surface, so that the area of the first surface irradiated by ultraviolet light is larger than that of the area of the second surface irradiated by ultraviolet light.
2. The adhesive film according to claim 1,
the light shielding layer comprises a plurality of strip-shaped parts which are arranged at intervals;
alternatively, the first and second electrodes may be,
the light shielding layer is provided with a plurality of hollow parts which are arranged at intervals.
3. The adhesive film according to claim 1, wherein the light-shielding layer is made of a colored coating material in a case where the light-shielding layer is provided on a side of the first protective layer away from the buffer adhesive layer.
4. The adhesive film of claim 1, wherein the viscosity of the buffer adhesive layer decreases by 50% or more after being irradiated by ultraviolet light.
5. The adhesive film of claim 1, wherein after the buffer adhesive layer is irradiated by ultraviolet light,
the peel strength of the first surface and the main glue layer is less than or equal to 20g/25mm, and the peel strength of the second surface and the first protective layer is more than or equal to 100g/25 mm.
6. The adhesive film of claim 1, wherein, on the second surface,
the transmittance of ultraviolet light in the area covered by the light shielding layer is less than or equal to 20 percent;
the transmittance of the ultraviolet light in the area not covered by the shading layer is more than or equal to 70 percent.
7. The adhesive film according to any one of claims 1 to 6, further comprising: the second protective layer is arranged on one side, far away from the buffer glue layer, of the main glue layer;
and the release force of the second protective layer is smaller than that of the first protective layer.
8. A method for packaging a display panel, comprising the steps of:
s1: providing an encapsulation film and a display panel;
s2: attaching the main adhesive layer in the adhesive film of any one of claims 1 to 7 to the surface of the packaging film;
s3: irradiating the adhesive film by ultraviolet light on one side of the first protective layer in the adhesive film so as to reduce the viscosity of the buffer adhesive layer in the adhesive film;
s4: separating the whole body comprising the first protective layer and the buffer adhesive layer with reduced viscosity from the main body adhesive layer to expose one side of the main body adhesive layer away from the packaging film;
s5: attaching one side of the main body adhesive layer, which is far away from the packaging film, to the display panel;
wherein the content of the first and second substances,
step S3 includes:
make the ultraviolet light be in the glued membrane first protective layer one side, it is right through the light shield layer in the glued membrane the region that is not covered by the light shield layer on the buffer glue layer is shone, so that the viscosity of buffer glue layer reduces, just be close to in the buffer glue layer the range that the viscosity of first surface part reduces is greater than be close to in the buffer glue layer the range that the viscosity of second surface part reduces.
9. The method of claim 8, wherein in the case of using a light shielding plate instead of the light shielding layer,
step S3 includes:
placing a light shielding plate above one side, away from the buffer adhesive layer, of the first protective layer in the adhesive film, wherein the light shielding plate exposes a partial area of the second surface, so that the area of the area, irradiated by ultraviolet light, of the first surface is larger than the area of the area, irradiated by ultraviolet light, of the second surface; the first surface is the surface of the buffer adhesive layer, which is in contact with the main body adhesive layer, and the second surface is the surface of the buffer adhesive layer, which is in contact with the first protective layer;
and irradiating the area, which is not covered by the light shielding plate, on the second surface of the buffer adhesive layer by using the light shielding plate to enable ultraviolet light to be on one side of the first protective layer, so that the viscosity of the buffer adhesive layer is reduced, and the reduction amplitude of the viscosity of the part, close to the first surface, in the buffer adhesive layer is larger than the reduction amplitude of the viscosity of the part, close to the second surface, in the buffer adhesive layer.
10. The method of packaging a display panel according to any one of claims 8 to 9, wherein before the step S2, the method further comprises the steps of:
and separating the second protective layer from the main body adhesive layer in the adhesive film to expose one side of the main body adhesive layer far away from the buffer adhesive layer.
11. A display device, comprising: the display panel, the packaging film and the main body adhesive layer after being packaged by the packaging method of the display panel according to any one of claims 8 to 10.
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