Hot melt adhesive film based on four-sided curved display screen

Abstract

The present invention discloses a hot melt adhesive film for laminating a four-sided curved display screen, including a laminating unit, wherein the laminating unit has a reserved cutout, and the reserved cutout is located at the four corners of the laminating unit. The hot melt adhesive film for laminating a four-sided curved display screen in the present invention can reduce wrinkles of the laminating unit at the corners of the display screen and avoid glue overflow at the corners of the display screen by setting reserved cutouts at the four corners of the laminating unit, and can avoid glue overflow at the corners of the display screen. The laminating unit in a molten state can automatically flow to the reserved cutout and fill the reserved cutout in other areas, thereby improving the laminating flatness and laminating yield of the display screen at the reserved cutout, and optimizing the display effect of the four-sided curved display screen.

Description

Technical Field

[0001] The invention relates to the technical field of display screen lamination, and in particular to a hot melt adhesive film based on lamination of a four-sided curved display screen. Background Art

[0002] The four-sided curved display screen has a curved design on the top and bottom of the screen based on the original double-curved side screen, which makes the four-sided curved display screen have a higher screen-to-body ratio and greatly optimizes the user experience. Because the four-sided curved display screen has a 3D curved design at the four corners, during the bonding process, the bonding glue has folds and stress at the corners, and the bonding glue cannot be completely melted or the filling of the display screen after melting is uneven, affecting the bonding quality of the display screen. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a hot melt adhesive film based on the lamination of a four-sided curved display screen, which can improve the lamination yield of the four-sided curved display screen.

[0004] The hot melt adhesive film for laminating a four-sided curved display screen according to the first aspect of the present invention includes:

[0005] The laminating unit has reserved cutouts, and the reserved cutouts are located at the four corners of the laminating unit.

[0006] The hot melt adhesive film based on the four-sided curved display screen according to the embodiment of the present invention has at least the following beneficial effects:

[0007] The hot melt adhesive film based on the bonding of a four-sided curved display screen in the embodiment of the present invention can reduce wrinkles of the bonding unit at the corners of the display screen and avoid glue overflow at the corners of the display screen by setting reserved cuts at the four corners of the bonding unit. The other areas of the bonding unit in a molten state can automatically flow to the reserved cuts and fill the reserved cuts, thereby improving the bonding flatness and bonding yield of the display screen at the reserved cuts, and optimizing the display effect of the four-sided curved display screen.

[0008] According to some embodiments of the present invention, the width of the reserved cutout gradually decreases from the center toward both sides.

[0009] According to some embodiments of the present invention, the reserved incision includes a first fitting area and a second fitting area, and the first fitting area and the second fitting area form an angle in combination.

[0010] According to some embodiments of the present invention, the width of the first fitting area and the width of the second fitting area gradually decrease in a direction from the center of the reserved incision toward both sides.

[0011] According to some embodiments of the present invention, the first bonding area is communicated with the second bonding area.

[0012] According to some embodiments of the present invention, a bonding area is further included, the reserved incision has a first bonding edge and a second bonding edge, and two ends of the bonding area are connected to the first bonding edge and the second bonding edge.

[0013] According to some embodiments of the present invention, the adhesion area is located at the center of the reserved incision.

[0014] According to some embodiments of the present invention, a plurality of adhesion areas are provided, and the adhesion areas are symmetrically distributed on both sides of the reserved incision relative to the center of the reserved incision.

[0015] According to some embodiments of the present invention, the reserved incision also includes a third bonding area and two adhesion areas, the reserved incision has a first bonding edge and a second bonding edge, the two ends of the adhesion area are respectively connected to the first bonding edge and the second bonding edge, and the two adhesion areas are respectively located between the third bonding area and the second bonding area, and between the third bonding area and the first bonding area.

[0016] According to some embodiments of the present invention, a plurality of the bonding units are included, and the plurality of the bonding units are arranged in sequence and connected as a whole.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the hot melt adhesive film based on four-sided curved display screen bonding of the present invention;

[0020] Figure 2 It is a structural schematic diagram of another embodiment of the hot melt adhesive film based on four-sided curved display screen bonding of the present invention;

[0021] Figure 3 It is a structural schematic diagram of another embodiment of the hot melt adhesive film based on four-sided curved display screen bonding of the present invention;

[0022] Figure 4 for Figure 3 A structural schematic diagram of an embodiment of a reserved incision;

[0023] Figure 5 for Figure 3 A partial schematic diagram of another embodiment at the reserved cutout;

[0024] Figure 6 for Figure 3 A partial schematic diagram of another embodiment at the reserved cutout;

[0025] Figure 7 It is a structural schematic diagram of another embodiment of the hot melt adhesive film based on four-sided curved display screen bonding of the present invention;

[0026] Figure 8 It is a structural schematic diagram of another embodiment of the hot melt adhesive film for laminating a four-sided curved display screen according to the present invention.

[0027] Reference numerals: bonding unit 100 , reserved incision 110 , first bonding area 111 , second bonding area 112 , adhesion area 113 , first bonding edge 114 , second bonding edge 115 , third bonding area 116 . DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, the meaning of "a plurality" is more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] Reference Figure 1 In one embodiment of the present invention, a hot melt adhesive film based on four-sided curved display screen bonding is provided. The hot melt adhesive film is used for bonding between the display panel and the protective panel in the four-sided curved display screen. The protective panel can be a glass panel, a plastic panel, or a functional panel with a touch function; the display panel can be a flexible panel, or a display module with a touch function, or a display module without touch or other functions. The two sides, top, and bottom of the protective panel all have 3D curved surfaces. When the hot melt adhesive film is attached to the protective panel, its four corners need to match the edges of the protective panel so that the protective panel can be flatly bonded to the display panel.

[0034] Therefore, the hot melt adhesive film based on the four-sided curved display screen in the embodiment of the present invention includes a bonding unit 100, the shape and size of the bonding unit 100 can be matched according to the shape and size of the display screen, and its specifications can be adaptively adjusted according to the actual bonding requirements of the display screen, and each display screen can be bonded with a bonding unit 100. The bonding unit 100 has a reserved cutout 110, which is located at the four corners of the bonded unit, and the reserved cutout 110 can be formed by cutting or punching. When attaching the hot melt adhesive film, the reserved cutouts 110 are located at the four corners of the protective panel, and the two sides of the hot melt adhesive film are attached to the protective panel and the display panel respectively. Since the bonding unit 100 is provided with the reserved cutouts 110 at the corners, when the bonding unit 100 is attached to the protective panel, the parts located at the two sides of the reserved cutouts 110 are pressed toward the inside of the reserved cutouts 110. The reserved cutouts 110 can absorb the stress generated by the pressing at the corners, and can reduce the wrinkles of the bonding unit 100 at the corners of the protective panel, so that the bonding of the protective panel and the display panel is smoother. In addition, when the protective panel and the display panel are hot-pressed, the hot melt adhesive film is heated and converted into The hot melt adhesive film is in a molten state and flows between the protective panel and the display panel. The molten hot melt adhesive film gradually fills the gap between the protective panel and the display panel and discharges the air between the two. During the flow of the hot melt adhesive film, the hot melt adhesive film on both sides of the reserved incision 110 automatically flows to the reserved incision 110 and fills the gap of the reserved incision 110, so that the thickness of the hot melt adhesive film at the corners tends to be consistent, thereby improving the flatness of the display panel and the protective panel at the corners. In addition, by setting the reserved incision 110, it is possible to avoid overflow of the hot melt adhesive film after it is melted due to wrinkles and overlaps of the hot melt adhesive film at the corners, thereby improving the fitting quality of the four-sided curved display screen.

[0035] Therefore, the hot melt adhesive film based on the bonding of the four-sided curved display screen in the embodiment of the present invention can reduce the wrinkles of the bonding unit 100 at the corners of the display screen and avoid glue overflow at the corners of the display screen by setting reserved cuts 110 at the four corners of the bonding unit 100, and the reserved cuts 110 are located at the corners of the display screen during bonding. The bonding unit 100 in a molten state can automatically flow to the reserved cuts 110 and fill the reserved cuts 110 in other areas, thereby improving the bonding flatness and bonding yield of the display screen at the reserved cuts 110, and optimizing the display effect of the four-sided curved display screen.

[0036] The hot-melt adhesive film can be a UV-curable optically transparent hot-melt adhesive film (TOCA), which is molten after heating and solidifies after ultraviolet irradiation, so that the protective panel and the display panel are bonded and fixed. The hot-melt adhesive film has a high light transmittance and good ductility, which can prevent the film from rebounding and the material from warping and deformation. It also has strong self-adhesion and can firmly adhere to the display panel and the protective panel, thereby improving the stability of the bonding between the display panel and the protective panel.

[0037] In addition, refer to Figure 2 The width of the reserved cutout 110 gradually decreases from the center to the two sides. This setting makes the width of the reserved cutout 110 the largest in the central area and the width on both sides gradually decrease. When the bonding unit 100 is bonded, the deformation and extrusion amplitude in the central area of ​​the corner are the largest, and the deformation on both sides is smaller. The reserved cutout 110 of this shape can meet the deformation requirements of the bonding unit 100 at the corners to avoid overlapping or wrinkling of the sides of the reserved cutout 110. After the bonding unit 100 is bonded, the gaps of the reserved cutout 110 in different areas tend to be consistent, thereby optimizing the flatness of the bonding unit 100 at the corners of the display screen.

[0038] Specifically, the reserved cutout 110 can be elliptical, circular or crescent-shaped, etc. The shapes of the reserved cutouts 110 located at different corners of the bonding unit 100 can be the same or different. The shape and width of the reserved cutout 110 can be reasonably set according to the curvature of the corners of the display screen and the bending length of the four sides.

[0039] Reference Figure 3 and Figure 4 The reserved cutout 110 includes a first bonding area 111 and a second bonding area 112. The first bonding area 111 and the second bonding area 112 are combined to form a certain angle. After the bonding unit 100 is bonded, the first bonding area 111 and the second bonding area 112 are respectively located at two sides forming corners. The provision of the first bonding area 111 and the second bonding area 112 can improve the fit between the reserved cutout 110 and the corners and sides of the display screen, thereby making the bonding unit 100 more flat at the corners.

[0040] It should be noted that the combination of the first bonding area 111 and the second bonding area 112 to form a certain angle means that the first bonding area 111 and the second bonding area 112 are two areas located on both sides of the reserved incision 110, and the overall extension direction of the first bonding area 111 and the second bonding area 112 is taken as the baseline, and the extension lines of the two baselines intersect in space to form a certain angle, which can be an acute angle or an obtuse angle, and the size of the angle can be reasonably adjusted according to the curvature of the corners of the display screen.

[0041] The first bonding area 111 and the second bonding area 112 can be symmetrically arranged relative to the center line of the reserved incision 110, so that the deformation amplitude of the bonding unit 100 on both sides of the corner is consistent, and when the bonding unit 100 is in a molten state, the flow speed of the adhesive film in the first bonding area 111 and the second bonding area 112 is the same, so that the bonding unit 100 at the corner of the display screen is smoother.

[0042] The width of the first bonding area 111 and the width of the second bonding area 112 gradually decrease from the center of the reserved incision 110 toward both sides, so that the area at the center of the reserved incision 110 is the largest, thereby providing sufficient extrusion space for the deformation of the side of the reserved incision 110 to avoid wrinkles and overlaps of the bonding unit 100 at the corners.

[0043] It should be noted that the first bonding area 111 and the second bonding area 112 can both be set to a triangle shape and have a sharp angle at the farthest end. Under the deformation law at the corners of the bonding unit 100, the two side edges of the first bonding area 111 and the two side edges of the second bonding area 112 can gradually approach and dock with each other, so that the bonding unit 100 can flow and fill the area between the two sides after melting, so that the bonding unit 100 can fully fill the corners of the display screen and improve the bonding flatness of the display screen at the corners.

[0044] The first bonding area 111 and the second bonding area 112 can be connected to each other. When the bonding unit 100 is bonded to the display screen, the sides of the first bonding area 111 and the second bonding area 112 can be deformed toward the central area of ​​the reserved cutout 110 at the same time, thereby avoiding wrinkles and overlaps in the central area of ​​the reserved cutout 110, and causing uneven thickness of the bonding unit 100 at the corners of the display screen, thereby affecting the bonding flatness of the bonding unit 100.

[0045] Because release films are attached to both sides of the hot melt adhesive film, the release films can protect the internal adhesive film. Before the hot melt adhesive film is attached to the display screen, the release films need to be torn off to expose the internal adhesive film. Since reserved cutouts 110 are provided at the corners of the laminating unit 100, there is a certain obstacle to the tearing of the release film. In order to improve the convenience of tearing off the release film, an adhesive area 113 can be provided in the reserved cutout 110. For details, refer to Figure 5 The reserved incision 110 has a first bonding edge 114 and a second bonding edge 115. The area enclosed by the first bonding edge 114 and the second bonding edge 115 is the hollow area of ​​the reserved incision 110. The two ends of the adhesion area 113 are respectively connected to the first bonding edge 114 and the second bonding edge 115. By setting the adhesion area 113, when the release film is torn off, the release film located in the outer area of ​​the reserved incision 110 can be brought away from the release film located in the inner area of ​​the reserved incision 110 through the adhesion area 113, thereby making the lamination of the hot melt adhesive film more convenient.

[0046] The adhesion area 113 can be set at the center of the reserved incision 110 to prevent the tip formed at the connection between the first bonding area 111 and the second bonding area 112 from curling up during the bonding process, affecting the bonding between the protective panel and the display panel. Moreover, even if the adhesion area 113 has slight wrinkles during the bonding process of the bonding unit 100, after the bonding unit 100 is melted, the adhesive film at the adhesion area 113 can flow toward the first bonding area 111 and the second bonding area 112, and fill the first bonding area 111 and the second bonding area 112, so that the adhesion area 113 tends to be flat, thereby ensuring the bonding quality at the corners of the display screen.

[0047] There may be multiple adhesion areas 113, which are distributed in different areas of the reserved incision 110 and are symmetrical with respect to the center line of the reserved incision 110. The adhesion areas 113 may be arranged in the first bonding area 111 and the second bonding area 112, and are distributed at intervals in the first bonding area 111 and the second bonding area 112, or are arranged in the central area of ​​the reserved incision 110, the first bonding area 111 and the second bonding area 112 at the same time; multiple adhesion areas 113 are arranged to further improve the convenience of tearing off the release film, and after the bonding unit 100 is melted, the adhesive film at the adhesion area 113 can flow to both sides thereof and quickly fill the hollow areas in the first bonding area 111 and the second bonding area 112, so as to improve the bonding efficiency and bonding quality of the bonding unit 100 at the corners.

[0048] Reference Figure 6 The reserved cutout 110 is provided with two adhesive regions 113, which are respectively located in the first bonding region 111 and the second bonding region 112. The reserved cutout 110 also includes a third bonding region 116, which is located in the central area of ​​the reserved cutout 110. The two adhesive regions 113 are respectively located on both sides of the third bonding region 116, and are respectively provided between the first bonding region 111 and the third bonding region 116 and between the second bonding region 112 and the third bonding region 116. The two adhesion areas 113 are located near the central area of ​​the reserved cutout 110; by setting the two adhesion areas 113, on the one hand, the central area of ​​the reserved cutout 110 is hollowed out, so that the reserved cutout 110 meets the deformation requirements of the bonding unit 100 at the center of the corner; on the other hand, the two adhesion areas 113 have a certain traction effect on the tip at the center of the reserved cutout 110, which can reduce the warping amount at the center of the reserved cutout 110, thereby improving the bonding flatness of the bonding unit 100 at the corners of the display screen.

[0049] For the convenience of storage, arrangement and transportation, the hot melt adhesive film can be rolled into a roll before use, and cut into corresponding sizes according to the specifications of the display screen to form a bonding unit 100. Therefore, the hot melt adhesive film can include multiple bonding units 100, and the multiple bonding units 100 are arranged in sequence according to a certain arrangement direction and connected as a whole to form a hot melt adhesive film with a certain length. Figure 7 and Figure 8 The laminating units 100 may be arranged along the length or width direction thereof, or may be arranged along the length and width directions at the same time.

[0050] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A hot melt adhesive film based on four-sided curved display screen, characterized in that: Used for bonding between the display panel and the protective panel in a four-sided curved display, including: The laminating unit has a reserved cutout, the reserved cutout is located at the four corners of the laminating unit, the two sides of the hot melt adhesive film are respectively attached to the protection panel and the display panel, the parts located on the two sides of the reserved cutout are squeezed into the inside of the reserved cutout, and after the laminating unit is converted into a molten state, the hot melt adhesive film located on the two sides of the reserved cutout automatically flows to the reserved cutout and fills the gap of the reserved cutout; The bonding unit also includes a bonding area, the reserved incision has a first bonding edge and a second bonding edge, the two ends of the bonding area are connected to the first bonding edge and the second bonding edge, the area enclosed by the first bonding edge and the second bonding edge is the hollow area of ​​the reserved incision, and after the bonding unit is melted, the adhesive film at the bonding area flows to both sides and quickly fills the hollow area.

2. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 1, characterized in that: The width of the reserved cutout gradually decreases from the center toward both sides.

3. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 1, characterized in that: The reserved incision includes a first bonding area and a second bonding area, and the first bonding area and the second bonding area form an angle in combination.

4. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 3, characterized in that: The width of the first bonding area and the width of the second bonding area gradually decrease in a direction from the center of the reserved incision toward both sides.

5. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 3, characterized in that: The first bonding area is communicated with the second bonding area.

6. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 1, characterized in that: The adhesion area is located at the center of the reserved incision.

7. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 1, characterized in that: A plurality of adhesion areas are provided, and the adhesion areas are symmetrically distributed on both sides of the reserved incision relative to the center of the reserved incision.

8. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 3 or 4, characterized in that: The reserved incision also includes a third bonding area and two adhesion areas, the two ends of the adhesion area are respectively connected to the first bonding edge and the second bonding edge, and the two adhesion areas are respectively located between the third bonding area and the second bonding area, and between the third bonding area and the first bonding area.

9. The hot melt adhesive film for laminating a four-sided curved display screen according to claim 1, characterized in that: It comprises a plurality of the laminating units, which are arranged in sequence and connected as a whole.

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