阅读说明：本技术 一种保护膜 (Protective film ) 是由 赵文炎 于 2021-06-23 设计创作，主要内容包括：本申请实施例提供的一种保护膜,包括基底,所述基底的顶面一侧设置有分立的粘性材料,分立的粘性材料能够阻断静电传导的路径,避免撕膜时保护膜与显示面板之间产生静电积累,从而减少进入显示面板的静电,改善显示面板的显示亮度不均,提高显示面板的显示均一性。(The embodiment of the application provides a protection film, including the basement, top surface one side of basement is provided with discrete viscous material, and discrete viscous material can block the route of static conduction, produces the static accumulation between protection film and the display panel when avoiding tearing the membrane to reduce the static that gets into display panel, improve display panel's the uneven display brightness, improve display panel's demonstration homogeneity.)

1. A protective film, comprising:

a substrate having a top surface with a discrete adhesive material disposed on one side.

2. The protective film according to claim 1, wherein the top surface of the substrate is provided with at least one first groove filled with an adhesive material; wherein the content of the first and second substances,

the surface of the adhesive material on the side away from the bottom surface of the first groove is flush with the top surface of the substrate.

3. The protective film of claim 2, wherein the first groove extends through at least one side of the substrate in a first direction parallel to the top surface of the substrate.

4. The protective film according to claim 3, wherein the first grooves are spaced apart in a second direction parallel to the top surface of the substrate, and the first direction and the second direction intersect.

5. The protective film according to claim 2, wherein the top surface of the substrate is further provided with at least one second groove intersecting with the extending direction of the first groove, the second groove is filled with the adhesive material, and the surface of the adhesive material on the side away from the bottom surface of the second groove is flush with the top surface of the substrate.

6. The protective film according to any one of claims 2 to 5, wherein the area of the first groove opening is smaller than the area of the first groove bottom surface.

7. The protective film according to any one of claims 2 to 5, wherein the sum of the projected areas of the first groove opening on the plane of the substrate is 50% to 70% of the area of the top surface of the substrate.

8. The protective film according to any one of claims 2 to 5, wherein the material of the substrate is at least one of polyethylene terephthalate, polystyrene ester, polyether ester, polycarbonate, and polymethyl methacrylate;

preferably, the adhesive material is at least one of acrylic resin, vinyl acetate resin, epoxy resin, amine-based resin, acrylic resin, polycarbonate, polystyrene, polymethacrylate, polyethylene terephthalate, and polyether ester.

9. The protective film according to any one of claims 2 to 5, wherein the depth of the first groove in a direction away from the top surface of the substrate is 1/2 to 2/3 of the thickness of the substrate;

preferably, the substrate has a thickness of 200 μm in a direction away from the top surface of the substrate.

10. A method for producing a protective film, comprising:

providing a substrate;

a discrete adhesive material is formed on the top surface of the substrate.

Technical Field

The invention belongs to the field of thin film materials, and particularly relates to a protective film and a preparation method thereof.

Background

Among the present a large amount of film material, relevant mostly is the protection film, and its structure of traditional protection film structure is generally two-layer, including the substrate with adhere to the glue film on the substrate, wherein the material of substrate mainly is films such as PET, and attached mode is whole face attached.

The OLED product screen body process usually comprises the steps of depositing an array film layer on a glass substrate, adhering a protective film on the back surface of a substrate to support a flexible screen body after the glass substrate is stripped by laser, tearing off the protective film after the flexible screen body is cut into a display panel, and adhering a supporting film. However, the protective film is not suitable for electrostatic prevention during the display panel peeling process.

The invention provides a protective film which can accumulate and conduct static electricity, and aims to solve the technical problem that the protective film cannot release static electricity after being attached to the surface of an object in the prior art.

In one aspect, an embodiment of the present invention provides a protective film, including: a substrate having a top surface side provided with a discrete adhesive material.

In yet another embodiment of the present application, the top surface of the substrate is provided with at least one first groove filled with an adhesive material; wherein the surface of the adhesive material on the side away from the bottom surface of the first groove is flush with the top surface of the substrate.

In yet another embodiment of the present application, the first groove penetrates at least one side surface of the substrate in a first direction parallel to the top surface of the substrate.

In yet another embodiment of the present application, the first grooves are spaced along a second direction parallel to the top surface of the substrate, and the first direction and the second direction intersect.

In yet another embodiment of the present application, the top surface of the substrate is further provided with at least one second groove intersecting with the extending direction of the first groove, the second groove is filled with the adhesive material, and the surface of the adhesive material on the side away from the bottom surface of the second groove is flush with the top surface of the substrate.

In yet another embodiment of the present application, the area of the first groove opening is smaller than the area of the first groove floor.

In yet another embodiment of the present application, the sum of the projected areas of the first recess opening onto the plane of the substrate is 50% to 70% of the area of the top surface of the substrate.

In yet another embodiment of the present application, the material of the substrate is at least one of polyethylene terephthalate, polystyrene ester, polyether ester, polycarbonate, and polymethyl methacrylate.

In yet another embodiment of the present application, the adhesive material is at least one of an acrylic resin, a vinyl acetate resin, an epoxy resin, an amine-based resin, a propylene resin, a polycarbonate, a polystyrene, a polymethacrylate, a polyethylene terephthalate, and a polyether ester.

In yet another embodiment of the present application, the depth of the first groove, in a direction away from the top surface of the substrate, is 1/2-2/3 of the thickness of the substrate; preferably, the substrate has a thickness of 200 μm in a direction away from the top surface of the substrate.

On the other hand, the embodiment of the invention also provides a preparation method of the protective film, which comprises the following steps: providing a substrate; a discrete adhesive material is formed on the top surface of the substrate.

The invention provides a protective film, which can be attached to the surface of a display panel through an adhesive material in the protective film when in use so as to be beneficial to supporting the display panel when other process operations are carried out, and when the protective film is removed, the blocking effect of the discrete adhesive material in the protective film can be utilized to block the charge accumulation in the film tearing process so as to avoid the influence of static electricity on the display panel. Further, not only can the static electricity generated by tearing the film be reduced, but also the static electricity accumulation at the tail end of the protective film can be reduced, so that the diffusion of the static electricity to the inside of the display panel is further reduced.

Drawings

FIG. 1 is a schematic top view of a protective film according to an embodiment of the present disclosure;

FIG. 2 is a schematic left side view of the protective film of FIG. 1 of the present application;

FIG. 3 is a schematic top view of a protective film according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of the protection film shown in FIG. 3;

FIG. 5 is a schematic view of a protective film according to yet another embodiment of the present application;

fig. 6 is a left side view of the protective film shown in fig. 5 of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Spatially relative terms such as "upper" and "lower" are defined herein with reference to the drawings. Thus, it will be understood that "upper" and "lower" may be used interchangeably. It will be understood that when a layer is referred to as being "on" another layer, it can be formed directly on the other layer, or intervening layers may also be present. Thus, it will be understood that when a layer is referred to as being "directly on" another layer, there are no intervening layers interposed therebetween.

In the drawings, the size of layers and regions may be exaggerated for clarity. It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout.

Hereinafter, although terms such as "first", "second", and the like may be used to describe various components, the components are not necessarily limited to the above terms. The above terms are only used to distinguish one component from another. It will also be understood that expressions used in the singular include expressions of the plural unless the singular has a distinctly different meaning in the context. Furthermore, in the following embodiments, it will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

In the following embodiments, when layers, regions or elements are "connected", it may be interpreted that the layers, regions or elements are not only directly connected but also connected through other constituent elements interposed therebetween. For example, when layers, regions, elements, etc. are described as being connected or electrically connected, the layers, regions, elements, etc. may be connected or electrically connected not only directly or directly but also through another layer, region, element, etc. interposed therebetween.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. When a statement such as "at least one (or" an) of … … is placed after a list of elements (elements), the entire list of elements (elements) is modified rather than modifying individual elements (elements) in the list.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

The inventors have studied and found that when a protective film of a conventional display panel is peeled off, a large amount of peeling static electricity is generated. The principle of the electrostatic contact separation is that when the distance between the two materials is less thanDuring the process, the static charge transfer occurs on the interface, one side of the interface is positively charged, the other side is negatively charged, and both sides are charged after the interface is separated. For the display panel, when the traditional protective film is torn, the electric charges simultaneously overflow into the flexible substrate and the lower protective film adhesive, the barrier layers on the flexible substrate and the flexible substrate can not completely block the static charges, and the static charges are injectedUnder the condition of large charge, partial charges drift to a back channel of a Thin Film Transistor (TFT), so that the TFT characteristics shift and the shift degrees are inconsistent, thereby causing display brightness difference, and macroscopically showing a phenomenon of uneven display brightness, so that static electricity generated at the moment of tearing a Film needs to be reduced to solve the problem of uneven display brightness. Further, since static electricity is generated during the peeling process and part of the static electricity is left on the surface of the protective film except for part of the static electricity diffused into the display panel, the static electricity is accumulated at the end of the protective film as the peeling process proceeds, and therefore, the closer the end of the protective film is, the larger the accumulated amount of static electricity is, the larger the shift of TFT characteristics is.

In order to solve the above problem, embodiments of the present application provide a support film, and the embodiments will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic top view of a protective film according to an embodiment of the present application; fig. 2 shows a schematic left side view of the protective film shown in fig. 1 according to the present application.

As shown in fig. 1 and 2, the protective film 1 provided by the embodiment of the present application includes a substrate 11, and a discrete adhesive material 12 is disposed on a top surface side of the substrate 11. It is understood that the individual adhesive materials 12 refer to adhesive materials 12 having a space therebetween, and specifically may be a plurality of adhesive materials 12 in a strip shape spaced apart from or at least partially connected to each other, or may be a plurality of individual adhesive materials 12 in a block shape, which is not specifically limited by the embodiment of the present application.

The utility model provides a protection film 1 is through being provided with discrete adhesive material 12 in top surface one side of basement 11, so set up, when tearing off attached protection film 1 on display panel, discrete adhesive material 12 can block the route of static conduction, produces static accumulation when avoiding tearing the membrane between protection film and the display panel to reduce the static that gets into display panel, improve display panel's the uneven problem of display brightness, improve display panel's demonstration homogeneity.

FIG. 3 shows a schematic view of a protective film according to an embodiment of the present application; fig. 3 shows a cross-sectional view of the protective film shown in fig. 4 in the a-a direction according to the present application.

As shown in fig. 3 and 4, the protective film 1 provided in the embodiments of the present application includes a substrate 11, a top surface of the substrate 11 is provided with at least one first groove 13, and the first groove 13 is filled with an adhesive material 12. Wherein the surface of the adhesive material 12 on the side away from the bottom surface of the first recess 13 is flush with the top surface of the substrate 11.

The utility model provides a protection film 1 is through setting up first recess 13 on basement 11, and fill adhesive material 12 in first recess 13, so set up, can enough guarantee the supporting role of protection film 1 to display panel, simultaneously when tearing off attached protection film 1 on display panel, the route of static conduction can be blocked to discrete adhesive material 12, produce the static accumulation between protection film and the display panel when avoiding tearing the membrane, thereby reduce the static that gets into display panel, improve display panel's the uneven problem of display brightness, improve display panel's demonstration homogeneity.

FIG. 5 shows a schematic view of a protective film according to yet another embodiment of the present application; fig. 6 illustrates a left side view of the protective film illustrated in fig. 5 according to the present application.

As shown in fig. 5 and 6, in an embodiment of the present application, along a first direction parallel to a top surface of the substrate 11, the first direction may be a Y direction in fig. 5, and the first groove 13 penetrates at least one side surface of the substrate 11, so that the first groove 13 penetrates the side surface of the substrate 11 to block a path of static electricity conducted along a surface of the protection film as much as possible, and on the other hand, the static electricity can also be conducted along the side surface of the substrate 13, thereby preventing static electricity from accumulating between the protection film and the display panel when the film is torn, reducing static electricity entering the display panel, improving uneven display brightness of the display panel, and improving display uniformity of the display panel.

Further, as shown in fig. 5 and 6, the first grooves 13 are arranged at intervals along a second direction parallel to the top surface of the substrate 11, the second direction may be an X direction in fig. 5, the first direction Y intersects with the second direction X, and a path for static electricity to conduct along the surface of the protective film can be blocked by arranging the plurality of first grooves 13, so that static electricity accumulation between the protective film and the display panel during film tearing is avoided, static electricity entering the display panel is reduced, uneven display brightness of the display panel is improved, and display uniformity of the display panel is improved.

Specifically, the protection film 1 is rectangular, the first direction may be a direction perpendicular to one diagonal line of the protection film 1, and the second direction is a direction perpendicular to the first direction, when the protection film is torn off, tearing is usually started from one end of the diagonal line of the protection film, and the direction of tearing the protection film is parallel to the direction of the diagonal line, so that the arrangement of the first groove 13 can improve the effect of blocking electrostatic conduction.

In another embodiment of the present application, the top surface of the substrate 11 is further provided with at least one second groove intersecting the extending direction of the first groove 13, and the extending directions of the first groove 13 and the second groove are parallel to the extending direction of the top surface of the substrate 11. Specifically, the second groove and the first groove 13 intersect to form a mesh-shaped groove on the top surface of the substrate 11, so that a static conduction path can be further blocked, and static accumulation between the protective film and the display panel during film tearing is avoided, so that static entering the display panel is reduced, uneven display brightness of the display panel is improved, and display uniformity of the display panel is improved. It is understood that the first groove 13 and the second groove may not intersect, that is, the extending directions of the first groove 13 and the second groove intersect, but the first groove 13 and the second groove are independent from each other and do not conduct.

In another embodiment of the present application, the area of the opening of the first groove 13 is smaller than the area of the bottom surface of the first groove 13, so that the adhesive material 12 can be fixed in the first groove 13, and therefore, the adhesive material 12 can be prevented from being separated from the first groove 13 and adhered to the display panel when the film is torn, particles can be prevented from being generated on the surface of the display panel, and the arrangement of other subsequent film layers is facilitated.

In another embodiment of the present application, the sum of the projected areas of the openings of the first grooves 13 on the plane of the substrate 11 is 50% -70% of the area of the top surface of the substrate 11, that is, the sum of the areas of the surfaces of the sides of the adhesive material 12 away from the bottom surface of the first grooves 13 is 50% -70% of the area of the top surface of the substrate, so that the adhesion between the protective film 1 and the display panel is ensured, the path of static electricity conduction can also be blocked, and static electricity accumulation between the protective film and the display panel during film tearing can be avoided.

Preferably, the sum of the projection areas of the openings of the first grooves 13 on the plane of the substrate 11 is 55% -65% of the area of the top surface of the substrate 11, and the adhesion force between the protective film 1 and the display panel is moderate, so that the film is convenient to tear and is not easy to fall off naturally.

In yet another embodiment of the present application, the material of the substrate 11 is at least one of polyethylene terephthalate, polystyrene ester, polyether ester, polycarbonate, and polymethyl methacrylate.

In another embodiment of the present application, the adhesive material may be a pressure-sensitive adhesive, the adhesiveness of the pressure-sensitive adhesive is proportional to the pressure within a certain range, and during the later-stage attaching process, the adhesion between the protective film 1 and the display panel may be enhanced, so that the protective film is not easily deformed and falls off.

In yet another embodiment of the present application, adhesive material 12 is at least one of an acrylic resin, a vinyl acetate resin, an epoxy resin, an amine-based resin, a propylene resin, a polycarbonate, a polystyrene, a polymethacrylate, a polyethylene terephthalate, and a polyether ester. Above-mentioned material is resin type pressure sensitive adhesive, and on the one hand, resin type pressure sensitive adhesive is in certain extent viscidity and pressure direct ratio, and the later stage laminating in-process can strengthen and display panel's adhesion non-deformable drops, and on the other hand, resin type pressure sensitive adhesive hardness is high relatively, can play better support and guard action to display panel.

In a further embodiment of the present application, the depth of the first groove 13 is 1/2-2/3 of the thickness of the substrate 11 in the direction away from the top surface of the substrate 11, so as to ensure the strength of the protective film 1 and avoid the rupture of the protective film when the film is torn; on the other hand, the depth of the first groove 13 is deep enough to block the static electricity conducting path well, so as to avoid the static electricity accumulation between the protective film 1 and the display panel when the film is torn.

Preferably, the substrate 11 has a thickness of 200 μm and the first groove 13 has a depth of 100 μm in a direction away from the top surface of the substrate 11, where the strength and the antistatic ability of the protective film 1 are optimal.

Based on the same concept, the embodiment of the application also provides a preparation method of the protective film, which comprises the steps of providing a substrate; a discrete tacky material is formed on the top surface of the substrate. Specifically, the discrete adhesive material may be divided into discrete regions by applying a full-surface adhesive material to the top surface of the substrate and then using a soft-sliding blade to divide the full-surface adhesive material into the discrete regions.

In other embodiments of the present application, the substrate is prepared by melt polymerization, and after the substrate is hardened, the first groove is formed on the top surface of the substrate by plasma gas cutting. In other embodiments of the present application, the first groove may also be formed by etching. After the first recess is formed, the first recess is filled with an adhesive material to form a discrete adhesive material.

Optionally, after the first groove is formed, a second groove is formed on the top surface of the substrate by plasma gas cutting, and the extending direction of the second groove is intersected with the extending direction of the first groove. After the first and second recesses are formed, the first and second recesses are filled with a viscous material to form discrete viscous materials.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

In accordance with the embodiments of the present application as described above, these embodiments are not exhaustive and do not limit the application to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated. The application is limited only by the claims and their full scope and equivalents.