CN110571355A - Method for attaching barrier film on display panel, barrier film and display panel - Google Patents
Method for attaching barrier film on display panel, barrier film and display panel Download PDFInfo
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- CN110571355A CN110571355A CN201910852920.9A CN201910852920A CN110571355A CN 110571355 A CN110571355 A CN 110571355A CN 201910852920 A CN201910852920 A CN 201910852920A CN 110571355 A CN110571355 A CN 110571355A
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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
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The invention provides an attaching method of a barrier film on a display panel, the barrier film and the display panel, which adopt a whole-face attaching mode to improve the production efficiency of the attaching process of the barrier film on the display panel. The attaching method comprises the following steps: attaching a barrier film on the whole surface of a display mother board, wherein the display mother board comprises a plurality of display panels arranged in an array manner, and each display panel comprises a display area and a non-display area; removing the barrier film covering the non-display area; and cutting the display mother board to obtain a plurality of independent display panels.
Description
Technical Field
the invention relates to the field of display panel manufacturing, in particular to an attaching method of a barrier film on a display panel, the barrier film and the display panel.
Background
In the display panel manufacturing industry, a barrier film is usually adhered to the outermost layer of the display panel to prevent scratches and block moisture. In the prior art, an attaching mode of attaching a barrier film to each display panel separately is generally adopted, and the traditional attaching mode has low generation efficiency.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a method for attaching a barrier film on a display panel to solve the problem of low attaching efficiency in the prior art.
The invention provides a method for attaching a barrier film on a display panel, which comprises the following steps: attaching a barrier film on the whole surface of a display mother board, wherein the display mother board comprises a plurality of display panels arranged in an array manner, and each display panel comprises a display area and a non-display area; removing the barrier film covering the display area; and cutting the display mother board to obtain a plurality of independent display panels.
In one embodiment, the barrier film is an adhesive type barrier film comprising a plurality of adhesive areas arranged at a distance from each other.
in one embodiment, the attaching the barrier film on the entire surface of the display mother substrate includes: aligning the barrier film and the display mother board so that the orthographic projection of the adhesive area covers the display area; a force is applied to the barrier film to bond the barrier film and the display mother substrate.
In one embodiment, the barrier film is a non-adhesive barrier film, and the attaching the barrier film on the whole display mother board includes: coating an adhesive layer on a display area of a display mother board; and attaching the whole face of the barrier film to the face, coated with the adhesive layer, of the display mother board.
In one embodiment, removing the barrier film covering the non-display area includes: the barrier film is laser cut along the edge of the display area to disconnect the portion of the barrier film covering the display area from the surrounding portion.
In one embodiment, removing the barrier film covering the non-display area includes: tearing off the part of the barrier film covering the non-display area and the interval area between the adjacent display panels; or subjecting the portion of the barrier film covering the non-display region and the spacer region between adjacent display panels to a degradation treatment to generate a liquid or gaseous substance to remove the portion of the barrier film covering the non-display region and the spacer region.
The present invention provides in a second aspect a barrier film comprising: substrate layer and glue film. The glue layer is located one side surface of substrate layer, including a plurality of viscose areas of interval arrangement.
In one embodiment, the glue layer comprises a fluorescent material.
In one embodiment, the substrate layer comprises a substrate and a barrier layer located on the substrate, the barrier layer comprises a plurality of grooves arranged at intervals, and the glue layer fills the plurality of grooves to form a plurality of glue areas.
The third aspect of the invention provides a display panel, which is prepared according to the method for attaching the barrier film on the display panel provided by any one of the embodiments.
according to the method for attaching the barrier film on the display panel and the barrier film, a surface attaching mode is adopted, namely the barrier film is attached to the whole surface of the display panels on the display mother board. This has the advantage that, on the one hand, the production efficiency is increased; on the other hand, the precision requirement on the attaching equipment is reduced, and the method is particularly suitable for attaching the barrier film on the small-size display screen.
drawings
Fig. 1a is a schematic structural diagram of a display motherboard according to an embodiment of the present invention.
Fig. 1b is a schematic partial structure diagram of one structural unit in the mother board shown in fig. 1 a.
Fig. 2 is a flowchart illustrating a method for attaching a barrier film on a display panel according to a first embodiment of the invention.
Fig. 3 is a flowchart illustrating a method for attaching a barrier film on a display panel according to a second embodiment of the invention.
Fig. 4a is a schematic structural view illustrating the alignment of the barrier film and the display mother substrate according to the attaching method shown in fig. 3.
Fig. 4b is a schematic structural view illustrating the barrier film and the display mother substrate bonded according to the attaching method shown in fig. 3.
Fig. 4c is a top view of the display mother substrate after the barrier film is cut according to the attaching method shown in fig. 3.
Fig. 4d is a schematic structural diagram of the display mother board cut according to the attaching method shown in fig. 3.
Fig. 5 is a flowchart illustrating a method for attaching a barrier film on a display panel according to a third embodiment of the invention.
Fig. 6 is a schematic structural view of a barrier film according to a first embodiment of the present invention.
Fig. 7 is a schematic structural view of a barrier film according to a second embodiment of the present invention.
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.
Fig. 1a is a schematic structural diagram of a display motherboard according to an embodiment of the present invention. Fig. 1b is a schematic partial structure diagram of one structural unit in the mother board shown in fig. 1 a. As shown in fig. 1a, the display mother board 100 includes a plurality of display panels 10 arranged at intervals, for example, the display mother board 100 shown in fig. 1a includes four display panels 10, and the four display panels 10 are arranged on the display mother board 100 in an array. A display mother board 100 may include tens, hundreds, or even thousands of display panels 10, and each display panel 10 may be as small as a mobile phone screen, an electronic watch screen, or even smaller. For example, the size of the display mother board 100 is 650 × 750mm, the number of layouts is 33 × 10, and the size of a single display panel is 10 × 10mm to 200 × 200 mm.
A specific structure of the display panel 10 is shown in fig. 1b, and the display panel 10 includes a Thin Film Transistor (TFT) array substrate 11, an electroluminescent structure 12, and a Thin Film encapsulation structure 13, which are sequentially stacked from bottom to top.
Specifically, the TFT array substrate 11 includes a substrate, which may be a glass substrate or a flexible substrate, and a plurality of film layers formed on the substrate. The multilayer film on the substrate forms a plurality of TFT structural units arranged in an array in the TFT array substrate 11 according to a certain arrangement structure, and each TFT structural unit is used for controlling the electroluminescent structure 12. The TFT array substrate 11 includes a display area Y and a non-display area N surrounding the display area Y. The electroluminescent structure 12 is disposed in the display region of the TFT array substrate 11.
the electroluminescent structure 12 may be any conventional display structure, such as a Light Emitting Diode (LED) or an Organic Light Emitting Diode (OLED). Taking OLED as an example, the electroluminescent structure 12 includes a cathode layer, an organic functional layer and an anode layer sequentially stacked on the TFT array substrate 11, the organic functional layer includes at least an organic light emitting layer, for example, the organic functional layer includes an electron injection layer, an electron transport layer, an organic light emitting layer, a hole transport layer and a hole injection layer sequentially stacked between the cathode layer and the anode layer.
The thin film encapsulation structure 13 includes organic layers and inorganic layers alternately stacked. For example, in the present embodiment, the thin film encapsulation structure 13 includes a first inorganic layer 131, an organic layer 132, and a second inorganic layer 133 sequentially stacked on the electroluminescent structure 12, the first inorganic layer 131 covers the electroluminescent structure 12 at a side close to the TFT array substrate 11, the first inorganic layer 131 and the second inorganic layer 133 are in direct contact around the organic layer 132, an orthographic projection of a region where the first inorganic layer 131 and the second inorganic layer 133 are in direct contact on the TFT array substrate 11 falls within the non-display region N, and the organic layer 132 is covered by the first inorganic layer 131 and the second inorganic layer 133, which can further improve the water and oxygen barrier effect.
As shown in fig. 1b, the display region Y and the non-display region N of the display panel 10 have a height difference. However, in an actual product, the thickness of the film layer of the thin film encapsulation structure 13 is very small, so the difference between the thicknesses of the display region Y and the non-display region N is negligible.
in other embodiments, the display panel 10 may further include: the film packaging structure 13 is covered with at least one of an upper film facing away from one side of the TFT array substrate 11 and a lower film facing away from one side of the electroluminescent structure 12 of the TFT array substrate 11, the upper film and the lower film have the functions of protecting the display panel and avoiding scratching before subsequent processes are carried out on the display panel, and the upper film and the lower film need to be torn off when the subsequent processes are carried out.
In order to avoid scratching the display panel 10 and further improve the blocking capability of the display panel 10 against water vapor and oxygen, a blocking film may be attached to the surface of the display panel 10. The barrier film may be attached to any surface of the display panel 10, for example, the barrier film is attached to the upper surface or the lower surface of the display panel 10 shown in fig. 1 b. When the barrier film is adhered to the upper surface of the display panel 10 shown in fig. 1b, the barrier film is used for assisting the thin film encapsulation structure 13 to further block the electroluminescent structure 12 from contacting with the external environment, so as to improve the encapsulation effect.
Fig. 2 is a flowchart illustrating a method 200 for attaching a barrier film on a display panel according to a first embodiment of the present invention, the method comprising:
Step S210, attaching a barrier film to the entire surface of the display mother substrate.
The structure of the display mother board is shown in fig. 1a, the display mother board 100 includes a plurality of display panels 10 arranged in an array, each of the display panels 10 includes a display area Y and a non-display area N, and usually, a spacing area G is included between the display panels 10, so as to facilitate cutting the display mother board 100 into the display panels 10, or some test structures are disposed in the spacing area, so as to test the thickness of each film layer of the display mother board 100, the electrical performance, and the like, that is, for the display mother board 100, it includes the display area Y, the non-display area N and the spacing area G between adjacent display panels 10.
The barrier film may be classified into a bonding type barrier film and a non-bonding type barrier film according to whether the adhesive layer is provided. The adhesive type barrier film is a barrier film with an adhesive layer, and the barrier film can be directly adhered with a display mother board; the non-adhesive barrier film is a barrier film without an adhesive layer, and when the barrier film is adhered to the display mother board, the adhesive layer is coated on the surface to be adhered of the barrier film or the display mother board.
Step S220, the barrier film covering the non-display area is removed.
step S230, cutting the display mother board to obtain a plurality of independent display panels. The resulting display panel is the display panel shown in fig. 1b with the barrier film attached.
according to the method for attaching the barrier film on the display panel provided by the embodiment, a surface-mount method is adopted, namely, the barrier film is attached on the display motherboard. The advantages are that on one hand, the precision requirement on the attaching equipment is reduced, and the method is particularly suitable for attaching the barrier film on the small-size display screen; and on the other hand, the generation efficiency is improved.
For the attaching method shown in fig. 2, in order to facilitate the removal of the barrier film covering the non-display area in step S220, in an embodiment, no glue layer is disposed on the barrier film in the area covering the non-display area N and the spacing area G. Two embodiments are described in detail below, as shown in fig. 3 and 5, respectively.
Fig. 3 is a flowchart illustrating a method for attaching a barrier film on a display panel according to a second embodiment of the invention. The attaching method is suitable for an adhesive type barrier film which comprises a plurality of adhesive areas arranged at intervals and non-adhesive areas except the adhesive areas. As shown in fig. 3, the method 300 for attaching a barrier film on a display panel includes steps S310 to S350, wherein step S210 is performed as step S310 and step S320, step S220 is performed as step S330 and step S340, and step S230 is performed as step S350. Specifically, the method comprises the following steps:
Step S310, with reference to the schematic structure diagram of fig. 4a after the alignment of the barrier film and the display mother board, the barrier film 40 and the display mother board 100 are aligned, so that the orthographic projection of the adhesive region 41 of the barrier film 40 covers the display region Y of the display mother board 400, and the orthographic projection of the non-adhesive region 42 covers the non-display region N and the spacer region G between adjacent display panels.
In the case that the arrangement structure of the adhesive region 41 on the barrier film 40 is the same as the arrangement structure of the display region Y on the display mother board 100, as shown in fig. 4a, the step S310 is implemented as: placing the display mother board 100 on a stage of a bonding tool; the start of the adhesive area 41 on the barrier film 40 is aligned with the start of the display area Y on the display mother substrate 100, so that the barrier film 40 and the display mother substrate 100 are aligned.
step S320, applying a force to the barrier film 40 to bond the barrier film 40 and the display mother board 400 with reference to the structural schematic diagram of fig. 4b after bonding the barrier film and the display mother board. Specifically, referring to fig. 4a, a roller is used to apply a force to the barrier film 40, and the bonding is gradually performed toward the other end, thereby achieving the bonding of the barrier film 40 and the display mother substrate 100.
Step S330, with reference to the top view of the display mother board shown in fig. 4c after the barrier film is cut, laser cutting is performed on the barrier film 40 along the edge of each display area Y on the display mother board, as shown by the dotted line in fig. 4c as a cutting line, so that the portion of the barrier film 40 covering each display area Y is disconnected from the surrounding portion.
The laser cutting speed is fast, the formed cut is thin, the perpendicularity between the cut and the surface is high, the width of a heat affected zone is small, the performance of materials near the cut is hardly influenced, the laser cutting precision is high, only the barrier film can be cut off by controlling the laser energy, and mistaken cutting of other film layers below the barrier film is prevented.
In step S340, with continued reference to fig. 4c, a portion of the barrier film 40 covering the non-display region and the spacer region (i.e., the region other than the display region Y) is torn.
Step S350, with reference to the schematic structure shown in fig. 4d after the display mother board is cut, cutting the display mother board into a plurality of independent display panels 10 along the space regions on the display mother board.
Laser cutting can be adopted, and the composite film layer forming the display mother board is completely cut off by controlling laser energy; or cutting with a knife wheel, and completely cutting off the composite film layer forming the display mother board by controlling the pressure of the knife wheel, thereby obtaining a plurality of independent display panels. After the subsequent processing, each display panel corresponds to a display device, such as a mobile phone screen, a computer screen, etc.
In one embodiment, step S220 may also be performed as: and degrading the barrier film in the non-display area to generate liquid or gaseous substances so as to remove the barrier film in the non-display area. For example, in the case of a photo-degradation method, the barrier film may be formed of a photo-degradable plastic or a photo-etching material, and the barrier film in the non-display area is degraded by irradiating a specific light source to generate a gaseous or liquid product, so as to remove the barrier film in the display area. Or, the chemical agent is contacted with the barrier film in the non-display area to decompose the chemical agent into liquid or gas so as to remove the barrier film in the display area.
According to the method for attaching the barrier film on the display panel provided by the embodiment, the adopted barrier film does not comprise an adhesive layer at the position corresponding to the display area of the display mother board, so that the removal of the barrier film in the non-display area is facilitated.
Fig. 5 is a flowchart illustrating a method for attaching a barrier film on a display panel according to a third embodiment of the invention. The attaching method is applicable to a non-adhesive type barrier film, as shown in fig. 5, and the attaching method 500 is different from the attaching method 300 shown in fig. 3 only in the execution of step S210. In this embodiment, step S210 is specifically executed as:
Step S510, a display area of the display mother board is coated with an adhesive layer.
and shielding other areas except the display area Y on the display mother board by adopting a preset mask plate, and coating an adhesive layer on the display area. The Adhesive layer includes any one of Pressure Sensitive Adhesive (PSA), liquid optical Adhesive (LOCA), and optical Adhesive (OCA).
Step S520, attach the whole face of the barrier film to the face of the display mother board coated with the adhesive layer. The attachment process may be accomplished with rollers and barrier film pulling tools.
According to the attaching method provided by the embodiment, compared with the attaching method shown in fig. 3, the requirement on the alignment precision of the barrier film and the display mother board is lower, and the attaching method is easy to implement.
The invention also provides a barrier film which is particularly suitable for the attaching method provided by any embodiment of the invention, and the barrier film can be conveniently removed in the non-display area. Fig. 6 is a schematic structural view of a barrier film according to a first embodiment of the present invention. As shown in fig. 6, the barrier film 60 is an adhesive barrier film, and includes a substrate layer 61 and a glue layer located on one side surface of the substrate layer 61, where the glue layer includes a plurality of glue areas 62 arranged at intervals. Specifically, in the present embodiment, as shown in fig. 6, the upper surface of the base material layer 61 is a flat surface, and the adhesive area 62 forms a protrusion on the surface of the base material layer 61.
The substrate layer 61 includes a base 611 and a barrier layer 612 on the base 611, and the glue layer is on the barrier layer 612. The substrate 61 may be made of a plastic material such as polyimide, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polycarbonate, polyethersulfone resin, or polyethylene naphthalate. The barrier layer 612 may be a single-layer film or a film formed by combining a plurality of films. The material forming the single film layer in the barrier layer may be an organic material such as polyvinylidene chloride, ethylene-vinyl alcohol copolymer, polyamide, polyester, polyimide; inorganic materials such as alumina, silicon nitride, silicon oxide, titanium dioxide are also possible.
Specifically, polyvinylidene chloride in the organic material is a high polymer material with flame resistance, corrosion resistance and good air tightness; the molecular chain of the ethylene-vinyl alcohol copolymer is tightly combined, and excellent barrier capability is shown; the polyamide is commonly called as nylon and has better barrier capability; the most common and most widely used materials in polyesters are polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); the polyimide has the advantages of good thermal stability, high strength, high toughness, good insulativity, good flame retardance, no toxicity, no pollution and the like. Polyvinylidene chloride, ethylene-vinyl alcohol copolymer, polyamide, polyester and polyimide all have good functions of blocking water vapor and oxygen, and can protect the flexible display panel from being corroded by the water vapor and the oxygen. Meanwhile, the flexible display panel has high hardness, and the flexible display panel can be effectively prevented from being scratched. The inorganic material has good water and oxygen blocking effect, and the aluminum oxide, the silicon nitride, the silicon oxide and the titanium dioxide can form a transparent film layer, so that the light emission of the display panel is not influenced.
The adhesive layer comprises any one of pressure-sensitive adhesive, optical adhesive and ultraviolet curing adhesive. The UV curing adhesive is preferably an UV curing adhesive, is also called as UV curing adhesive, is a single component, does not contain solvent, is an adhesive and a sealant cured by UV and visible light, has the advantages of high curing speed, low energy consumption, no solvent pollution and the like, and is a novel energy-saving environment-friendly adhesive. By UV curing is meant: the photoinitiator in the adhesive is rapidly decomposed into free radicals or cations under the irradiation of ultraviolet light with proper wavelength and light intensity, and then unsaturated bond polymerization is initiated to solidify the material.
In one embodiment, a fluorescent material is added to the glue layer. Thus, when light irradiates on the barrier film, the boundary of the adhesive area 62 is highlighted, thereby providing alignment marks for the subsequent lamination process of the barrier film and the display mother board 100.
Fig. 7 is a schematic structural view of a barrier film according to a second embodiment of the present invention. As shown in fig. 7, the barrier film 70 is different from the barrier film 60 shown in fig. 6 only in that the barrier layer 712 includes a plurality of grooves arranged at intervals, and the glue layer fills the plurality of grooves to form the plurality of glue areas 22.
In one embodiment, the barrier layer 712 includes a first material layer on the substrate 211 and a second material layer on the first material layer for filling the areas between the adhesive areas 22 to form a flat surface on the surface of the barrier film. In this case, the first material layer may be directly prepared on the substrate when the barrier film is prepared; then forming a second material layer on the first material layer by using the first mask plate; and forming a glue layer on the exposed surface of the first material layer by using a second mask plate. The preparation process does not need to etch grooves and is simpler.
The barrier film 70 provided according to the present embodiment has a flat upper surface, and the subsequent bonding effect with the display mother board 100 is better.
The invention also provides a display panel, which is prepared according to the method for attaching the barrier film on the display panel provided by any embodiment.
It should be understood that the terms "first" and "second" used in the description of the embodiments of the present invention are only used for clearly illustrating the technical solutions, and are not used for limiting the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A method for attaching a barrier film on a display panel includes:
Attaching a barrier film to the whole surface of a display mother board, wherein the display mother board comprises a plurality of display panels arranged in an array, and each display panel comprises a display area and a non-display area;
Removing the barrier film covering the non-display area;
And cutting the display mother board to obtain a plurality of independent display panels.
2. The method as claimed in claim 1, wherein the barrier film is an adhesive barrier film comprising a plurality of adhesive regions spaced apart from each other.
3. The method of claim 2, wherein the step of attaching the barrier film to the display mother substrate comprises:
Aligning the barrier film and the display mother board so that the orthographic projection of the adhesive area covers the display area;
Applying a force to the barrier film to bond the barrier film and the display mother substrate.
4. the method of claim 1, wherein the barrier film is a non-adhesive barrier film, and the attaching the barrier film to the entire display mother substrate comprises:
coating an adhesive layer on the display area of the display mother board;
And attaching the whole face of the barrier film to the face, coated with the adhesive layer, of the display mother board.
5. The method of any of claims 1-4, wherein removing the barrier film covering the non-display area comprises:
And laser cutting the barrier film along the edge of the display area to disconnect the part of the barrier film covering the display area from the surrounding part.
6. The method of claim 5, wherein the removing the barrier film covering the non-display region comprises:
Tearing off the part of the barrier film covering the non-display area and the interval area between the adjacent display panels; or
And degrading the part of the barrier film covering the non-display area and the spacing area between the adjacent display panels to generate a liquid or gaseous substance so as to remove the part of the barrier film covering the non-display area and the spacing area.
7. A barrier film, comprising:
A substrate layer; and
The glue layer is positioned on one side surface of the base material layer and comprises a plurality of glue areas which are arranged at intervals.
8. The barrier film of claim 7 wherein the glue layer comprises a fluorescent material.
9. The barrier film of claim 7 or 8, wherein the substrate layer comprises a base and a barrier layer on the base, the barrier layer comprises a plurality of grooves spaced apart from each other, and the glue layer fills the plurality of grooves to form the plurality of glue areas.
10. a display panel prepared according to the method for attaching a barrier film on a display panel of any one of claims 1 to 6.
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