阅读说明：本技术 保护膜及盖板 (Protective film and cover plate ) 是由 包征 辛燕霞 蒋卓林 陈功 于 2020-07-15 设计创作，主要内容包括：本发明涉及一种保护膜,包括保护膜基材,所述保护膜基材的第一表面设置有粘结胶层,所述粘结胶层包括位于中部的第一胶层,和围设于所述第一胶层的四周的防水胶层。本发明还涉及一种盖板。通过防水胶层的设置,在不增加胶材的厚度的前提下,保证胶层的粘结性,防止保护膜脱落,且不会在撕除时出现残胶。(The invention relates to a protective film which comprises a protective film base material, wherein a bonding adhesive layer is arranged on the first surface of the protective film base material, and the bonding adhesive layer comprises a first adhesive layer positioned in the middle and a waterproof adhesive layer arranged around the first adhesive layer. The invention also relates to a cover plate. Through the setting of waterproof glue layer, under the prerequisite that does not increase the thickness of gluing the material, guarantee the cohesiveness of glue film, prevent that the protection film from droing, and can not appear the cull when tearing off.)

1. The protective film is used for protecting an electronic device hole in a cover plate and is characterized by comprising a protective film base material, wherein a bonding adhesive layer is arranged on a first surface of the protective film base material and comprises a first adhesive layer located in the middle and a waterproof adhesive layer arranged around the first adhesive layer.

2. The protective film according to claim 1, wherein the first adhesive layer and the waterproof adhesive layer are made of the same material, and the first adhesive layer and the waterproof adhesive layer are of an integral structure.

3. The protective film according to claim 1, wherein the first adhesive layer is made of acrylic adhesive.

4. The protective film according to claim 1, wherein the waterproof adhesive layer is made of a branched polymer adhesive with catechol side chain.

5. The protective film according to claim 1, wherein the material of the protective film substrate is polyester resin.

6. The protective film according to claim 1, wherein the thickness of the protective film substrate is 25 to 35um, the thickness of the first adhesive layer is the same as the thickness of the waterproof adhesive layer, and the thickness of the first adhesive layer is 20 to 30 um.

7. The protective film according to claim 1, further comprising a release film disposed on a surface of the adhesive layer away from the protective film substrate.

8. The protective film according to claim 7, wherein the release film has a thickness of 30 to 40 um.

9. A cover plate comprising an electronic device hole, and the protective film according to any one of claims 1 to 8 covering the electronic device hole, wherein an orthographic projection of the first adhesive layer on the cover plate coincides with the electronic device hole.

10. The cover plate according to claim 9, comprising a light-shielding region hollowed out to form the light-transmissive electronic device hole.

11. The cover sheet of claim 9 wherein the area of the first glue layer is greater than or equal to the area of the electronics aperture in the cover sheet of the display screen.

Technical Field

The invention relates to the technical field of display product manufacturing, in particular to a protective film and a cover plate.

Background

The protective film structure used for protecting the electronic device hole on the flexible OLED display screen commonly used at present is a sandwich structure: PET substrate + ya keli adhesive + is from type membrane, and during the use, peels off from type membrane to bond in the position with the electron device hole of CG (apron), avoid flexible electron device hole bad such as fish tail to appear.

Because the acrylic adhesive belongs to a cyanoacrylate adhesive, the water resistance of the adhesive is poor; after cover plate incoming materials (with a protective film) are subjected to screening in a production line, the dust/impurities in the cover plate are cleaned through a DI-Water (deionized Water) washing process; deionized water also can make adhesive viscosity reduce simultaneously, and through when spraying, the protection film drops easily, and the later stage can cause the electron device hole fish tail. When the thickness of the acrylic adhesive is increased to improve the viscosity, the adhesive residue phenomenon can occur when the protective film is peeled off.

Disclosure of Invention

In order to solve the technical problems, the invention provides a protective film and a cover plate, which solve the problem that a rubber material adopted by the protective film is poor in water resistance.

In order to achieve the purpose, the invention adopts the technical scheme that: the protective film is used for protecting an electronic device hole in a cover plate and comprises a protective film base material, wherein a bonding adhesive layer is arranged on a first surface of the protective film base material, and comprises a first adhesive layer located in the middle and a waterproof adhesive layer arranged around the first adhesive layer in a surrounding mode.

Optionally, the first glue layer is the same as the waterproof glue layer in material, and the first glue layer and the waterproof glue layer are of an integral structure.

Optionally, the first adhesive layer is made of acrylic adhesive.

Optionally, the waterproof glue layer is made of a branched polymer adhesive with catechol branched chains.

Optionally, the protective film substrate is made of polyester resin.

Optionally, the thickness of the protective film substrate is 25-35 um, the thickness of the first adhesive layer is the same as that of the waterproof adhesive layer, and the thickness of the first adhesive layer is 20-30 um.

Optionally, the adhesive tape further comprises a release film disposed on a surface of the adhesive layer away from the protective film substrate.

Optionally, the thickness of the release film is 30-40 um.

The embodiment of the invention also provides a cover plate, which comprises an electronic device hole and the protective film covering the electronic device hole, wherein the orthographic projection of the first adhesive layer on the cover plate is superposed with the electronic device hole.

Optionally, the light-shielding device comprises a light-shielding region, wherein the light-shielding region is hollowed to form the light-transmitting electronic device hole.

Optionally, the area of the first adhesive layer is greater than or equal to the area of the electronic device hole in the cover plate of the display screen.

The invention has the beneficial effects that: through the setting of waterproof glue layer, under the prerequisite that does not increase the thickness of gluing the material, guarantee the cohesiveness of glue film, prevent that the protection film from droing, and can not appear the cull when tearing off.

Drawings

FIG. 1 is a schematic view showing a structure of a protective film according to an embodiment of the present invention;

FIG. 2 is a schematic view of a cover plate according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a state where a waterproof adhesive layer is formed on a protective film substrate according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a first glue layer formed on a protective film substrate according to an embodiment of the present invention;

FIG. 5 is a schematic view showing a protective film attached to a protective film substrate according to an embodiment of the present invention;

Fig. 6 is a schematic diagram showing a state in which cutting is performed in the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The embodiment of the invention provides a protective film for protecting an electronic device hole on a cover plate, as shown in fig. 1, the protective film comprises a protective film substrate 1, a bonding adhesive layer 2 is arranged on a first surface of the protective film substrate 1, and the bonding adhesive layer 2 comprises a first adhesive layer 21 positioned in the middle and a waterproof adhesive layer 22 arranged around the first adhesive layer 21.

The waterproof glue layer 22 greatly improves the interaction between the adhesive and the adhered object (i.e. the adhesion between the protective film and the cover plate 4) so as to obtain stable underwater adhesion effect. Will waterproof glue film 22 encloses to be located around first glue film 21, avoid apron 4 when wasing, first glue film 21 and water contact, viscidity reduces, takes place to drop, and waterproof glue film 22's setting has been avoided first glue film 21 and water contact, and waterproof glue film 22 water proofness itself is stronger, and waterproof glue film 22's setting can guarantee the cohesiveness of whole glue film in aqueous when not increasing the thickness of whole glue film, the cull problem when avoiding tearing the protection film.

In this embodiment, for example, the first adhesive layer 21 and the waterproof adhesive layer 22 are made of the same material, and the first adhesive layer 21 and the waterproof adhesive layer 22 are of an integral structure.

In this embodiment, the first adhesive layer 21 is made of acrylic adhesive.

When the protection film is attaching on apron 4, first glue film 21 is just to electron device hole 42 on apron 4, as long as guarantee to enclose to locate first glue film 21 glue film all around is waterproof glue film 22, has waterproof function, avoids first glue film 21 and water contact guarantee the cohesiveness of first glue film 21 in aqueous, the material of first glue film 21 can be set for according to actual need, the material of first glue film 21 can with waterproof glue film 22's material is the same, like this first glue film 21 with waterproof glue film 22 can the synchronous technology form, simplifies the process steps. The material of the first adhesive layer 21 may also be different from the material of the waterproof adhesive layer 22, and in this embodiment, the material of the first adhesive layer 21 is the same as the material of the adhesive layer of the protective film in the conventional technology, and is an acrylic adhesive, so as to ensure that the first adhesive layer 21 does not affect the overall performance of the display device, and it is preferable that the first adhesive layer 21 is made of an acrylic adhesive in this embodiment.

In the embodiment of the present invention, the area of the first glue layer 21 is greater than or equal to the area of the electronic device hole 42 on the cover plate 4 of the display screen.

When the protection film is attached to the cover plate 4, the first adhesive layer 21 covers over the electronic device hole 42, in this embodiment, the material of the first adhesive layer 21 is the same as that of the protection film in the conventional technology, that is, the protection film is made of acrylic adhesive, the area of the first adhesive layer 21 is larger than or equal to the area of the electronic device hole 42 in the cover plate 4 of the display screen, so that the first adhesive layer 21 completely covers the electronic device hole 42 in the cover plate 4, and the functional influence on the display device is effectively avoided.

In this embodiment, the waterproof adhesive layer 22 is made of a branched polymer adhesive with catechol branches.

The novel water-resistant adhesive material, namely HBPA (high branched Polymer, catechol branched Polymer adhesive), is phase-separated, increases hydrophobicity caused by agglomeration, can eliminate hydration water on an interface, and greatly improves the interaction between the adhesive and an adherend so as to obtain a stable in-water adhesion effect.

In this embodiment, the material of the protective film substrate 1 is polyester resin (PET).

In this embodiment, the thickness of the protective film substrate 1 is 25 to 35um, the thickness of the first adhesive layer 21 is the same as the thickness of the waterproof adhesive layer 22, and the thickness of the first adhesive layer 21 is 20 to 30 um.

In this embodiment, the protective film further includes a release film 3 disposed on a surface of the adhesive layer 2 away from the protective film substrate 1. The release film 3 can protect the protective film before the protective film is assembled with the cover plate 4.

In this embodiment, the thickness of the release film 3 is 30 to 40um, but not limited thereto.

The embodiment of the present invention further provides a cover plate 4, as shown in fig. 2, including an electronic device hole 42 corresponding to an electronic device in a display device, and the protective film covering the electronic device hole 42, wherein an orthographic projection of the first glue layer 21 on the cover plate 4 coincides with the electronic device hole 42.

The waterproof glue layer 22 greatly improves the interaction between the adhesive and the adhered object (i.e. the adhesion between the protective film and the cover plate 4) so as to obtain stable underwater adhesion effect. Will waterproof glue film 22 encloses to be located around first glue film 21, avoid apron 4 when wasing, first glue film 21 and water contact, viscidity reduces, takes place to drop, and waterproof glue film 22's setting has been avoided first glue film 21 and water contact, and waterproof glue film 22 water proofness itself is stronger, and waterproof glue film 22's setting can be when not increasing the thickness of whole glue film, guarantees the cohesiveness of whole glue film in aqueous, and the cull problem when avoiding tearing the protection film, effectually protects the electron device hole.

The electronic device may be a camera module, a sensor, or the like.

In this embodiment, the cover plate 4 includes a light shielding region 41, and the electronic device hole 42 capable of transmitting light is hollowed out on the light shielding region 41.

Shading district 41 is by coating in the printing ink layer that presets the region (corresponding to display panel's non-display area) on apron 4 forms, shading district 41 goes up to carry out the fretwork in the position that corresponds to display device's electron device (for example the module of making a video recording) and sets up in order to form and allow the natural light to see through electron device hole 42, the protection film is attached in on apron 4, first glue film 21 covers electron device hole 42, waterproof glue film 22 is located cover in shading district 41 is last.

In the embodiment of the present invention, the area of the first glue layer 21 is greater than or equal to the area of the electronic device hole 42 on the cover plate 4 of the display screen.

When the protection film is attached to the cover plate 4, the first adhesive layer 21 covers over the electronic device hole 42, in this embodiment, the material of the first adhesive layer 21 is the same as that of the protection film in the conventional technology, that is, the protection film is made of acrylic adhesive, the area of the first adhesive layer 21 is larger than or equal to the area of the electronic device hole 42 in the cover plate 4 of the display screen, so that the first adhesive layer 21 completely covers the electronic device hole 42 in the cover plate 4, and the functional influence on the display device is effectively avoided.

The following describes the manufacturing process of the protective film of this embodiment.

HBPA is sprayed on the protective film substrate 1 using a glue application apparatus 10 to form a waterproof glue layer 22, as shown in fig. 3.

The glue coating apparatus 10 is used to spray acrylic glue to form the first glue layer 21, as shown in fig. 4.

The waterproof adhesive layer 22 and the first adhesive layer 21 are adhered to the release film 3 after being cured.

Cutting is performed to form a plurality of the protective films as shown in fig. 6.

It should be noted that the cutting is performed by the cutting tool 100, the cutting position is set according to actual requirements, and fig. 6 shows the cutting position of the cutting tool 100 for performing cutting in the first direction and the cutting area 200 in the second direction, but this embodiment is not limited thereto, and the size of the cutting area 200 is also only an illustration.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.