Buffer film, display device, and preparation method for display device

Abstract

A buffer film (10), a display device having the buffer film (10), and a preparation method for the display device. The buffer film (10) is configured to be arranged on one side of a display panel (20). The buffer film (10) comprises a support layer (1), a buffer layer (2), an isolation layer (3), and a rheological layer (4), wherein the buffer layer (2) is arranged on one side of the support layer (1); the isolation layer (3) is arranged on the side of the buffer layer (2) away from the support layer (1); and the rheological layer (4) is arranged on the side of the isolation layer (3) away from the support layer (1), the rheological layer (4) comprises a plurality of first protrusions (41) protruding in a direction away from the support layer (1), and the rheological layer (4) is configured for fitting onto the display panel (20).

Description

Buffer film, display device and preparation method of display device TECHNICAL FIELD

[0001] The present application relates to the field of display panels, in particular to a buffer film, a display device and a preparation method of the display device. BACKGROUND

[0002] With the development of science and technology, display devices have been developing towards larger display areas, thinner and lighter, and more portable. In order to improve the ability of the display device to resist damage from external forces, a buffer film is attached to one side of the display panel. In the display device of the related art, in order to improve the ability of the display device to resist damage from external forces, the thickness of the buffer film is relatively thick, and air bubbles are prone to exist between the buffer film and the display panel, affecting the display effect of the display panel. SUMMARY

[0003] Embodiments of the present application provide a buffer film, a display device and a preparation method of the display device, aiming to reduce or avoid air bubbles between the buffer film and the display panel, and improve the display effect of the display panel.

[0004] Embodiments of the first aspect of the present application provide a buffer film for being arranged on one side of a display panel, the buffer film comprising:

[0005] a support layer;

[0006] a buffer layer arranged on one side of the support layer;

[0007] an isolation layer arranged on one side of the buffer layer away from the support layer;

[0008] a rheological layer arranged on one side of the isolation layer away from the support layer, the rheological layer comprising a plurality of first protrusions protruding away from the support layer, the rheological layer being used to be attached to the display panel.

[0009] Embodiments of the second aspect of the present application provide a display device, the display device comprising:

[0010] a display panel;

[0011] the buffer film as provided in the first aspect, at least part of the buffer film being attached to the display panel, and the rheological layer being arranged between the isolation layer and the display panel.

[0012] Embodiments of the third aspect of the present application provide a preparation method of a display device, the preparation method comprising:

[0013] providing a display panel, the display panel having a backlight surface and a light-emitting surface arranged oppositely;

[0014] placing the buffer film provided in the above embodiments on the backlight surface of the display panel, the first protrusions facing the display panel;

[0015] The buffer film and the display panel are laminated so that the rheological layer is attached to the backlight surface.

[0016] In the buffer film, the display device and the preparation method of the display device provided by the embodiments of the present application, the rheological layer and the buffer layer can buffer the pressure received by the display panel together by setting the rheological layer and the buffer layer with buffering capacity; the buffer layer and the rheological layer can deform on opposite sides of the isolation layer under the action of external force by setting the isolation layer to separate the buffer layer and the rheological layer, so that the deformed buffer layer under the action of lamination pressure does not hinder the movement of air bubbles between the laminated buffer film and the display panel; the movement of air bubbles between the buffer film and the display panel to the edge of the buffer film for discharge is facilitated by setting a plurality of first protrusions in the rheological layer, thereby improving the display effect of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the drawings, in which like or similar features are identified with like or similar reference signs, and in which the drawings are not drawn to scale.

[0018] FIG. 1 is a schematic diagram of a cross-sectional structure of a buffer film according to an embodiment of the first aspect of the present application;

[0019] FIG. 2 is a schematic diagram of a cross-sectional structure of a buffer film laminated to a display panel according to an embodiment of the first aspect of the present application;

[0020] FIG. 3 is a schematic diagram of a planar structure of a buffer film according to an embodiment of the first aspect of the present application;

[0021] FIG. 4 is a schematic diagram of a cross-sectional structure of a buffer film according to an embodiment of the first aspect of the present application;

[0022] FIG. 5 is a schematic diagram of a planar structure of a buffer film according to an embodiment of the first aspect of the present application;

[0023] FIG. 6 is a schematic diagram of a cross-sectional structure of a buffer film according to an embodiment of the first aspect of the present application;

[0024] FIG. 7 is a schematic diagram of a cross-sectional structure of a buffer film according to an embodiment of the first aspect of the present application;

[0025] FIG. 8 is a schematic diagram of a cross-sectional structure of a buffer film according to an embodiment of the first aspect of the present application;

[0026] FIG. 9 is a schematic diagram of a cross-sectional structure of a buffer film in a separation state of a release layer and a rheological layer according to an embodiment of the first aspect of the present application;

[0027] FIG. 10 is a schematic diagram of a cross-sectional structure of the buffer film according to an embodiment of the first aspect of the present application;

[0028] FIG. 11 is a schematic diagram of a cross-sectional structure of the display device according to an embodiment of the first aspect of the present application;

[0029] FIG. 12 is a flowchart of a method for manufacturing the display device according to an embodiment of the first aspect of the present application. DETAILED DESCRIPTION

[0030] In order to make the purposes, technical solutions and advantages of the present application clearer, the features and exemplary embodiments of various aspects of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are configured only to explain the present application and are not configured to limit the present application. The present application can be implemented without some of the specific details by those skilled in the art. The following description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application.

[0031] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0032] It should be understood that, when describing the structure of a component, when one layer, one region is referred to as being located on the "surface" or "side" of another layer, another region, it can mean being directly on the surface of another layer, another region, or containing other layers or regions between it and another layer, another region. Moreover, if the component is flipped, the layer, the region will be located "under" or "below" the other layer, the other region.

[0033] In the process of implementing the present application, the inventors found the following problems in the related art. In the display device of the related art, because the modulus of part of the material in the buffer film is small, the part of the material is prone to deformation in the process of attaching the buffer film, so that the air bubbles generated between the buffer film and the display panel are blocked by the deformed buffer film, the air bubbles cannot be discharged, and the display effect of the display panel is affected.

[0034] The existing solutions cannot well solve the technical problems. To solve the problems, the embodiments of the present application provide a buffer film, a display device and a preparation method of the display device. The embodiments of the buffer film, the display device and the preparation method of the display device will be described below with reference to the accompanying drawings.

[0035] Referring to FIGS. 1 and 2, the application provides a buffer film 10 for being arranged on one side of a display panel 20. The buffer film 10 includes a support layer 1, a buffer layer 2, an isolation layer 3 and a rheological layer 4. The buffer layer 2 is arranged on one side of the support layer 1. The isolation layer 3 is arranged on one side of the buffer layer 2 away from the support layer 1. The rheological layer 4 is arranged on one side of the isolation layer 3 away from the support layer 1. The rheological layer 4 includes a plurality of first protrusions 41 protruding away from the support layer 1. The rheological layer 4 is used to be attached to the display panel 20.

[0036] The display panel 20 includes a light-emitting surface and a backlight surface arranged oppositely. The light emitted by the display panel 20 can be emitted from the light-emitting surface. The buffer film 10 can be attached to the backlight surface of the display panel 20, thereby reducing damage to the display panel 20 caused by external force impact.

[0037] The support layer 1 can be made of a hard material and is not easy to deform under stress. The support layer 1 can well ensure that the buffer film 10 has a required shape. When the buffer film 10 is attached to the display panel 20, the support layer 1 can also support the display panel 20 to structurally reinforce the display panel 20.

[0038] The buffer layer 2 has a smaller modulus than the support layer 1. The material of the buffer layer 2 includes a flexible material such as silicone gel. The buffer layer 2 can buffer external force. When the buffer film 10 is attached to the display panel 20, the buffer layer 2 can buffer the pressure received by the display panel 20. During the attachment of the buffer film 10 to the display panel 20, the buffer film 10 can also prevent the attachment pressure from damaging the display panel 20.

[0039] The isolation layer 3 is isolated between the buffer layer 2 and the rheological layer 4, so that during extrusion of the buffer film 10 by external force, the buffer layer 2 and the rheological layer 4 can only independently deform on opposite sides of the isolation layer 3. The deformed buffer layer 2 will not affect the structure of the rheological layer 4.

[0040] Under the action of an external force, the rheological layer 4 can be deformed and flow, and the external force can be gravity, a lamination pressure for laminating the buffer film 10 and the display panel 20. The rheological layer 4 can be made of the same or different material as the buffer layer 2. The rheological layer 4 includes a plurality of first protrusions 41 protruding in a direction away from the support layer 1, and the first protrusions 41 are first contacted with the display panel 20 in the process of laminating the buffer film 10 and the display panel 20. The rheological layer 4 can be provided with a thickness as required to apply a lamination pressure to the buffer film 10, and under the action of the lamination pressure, the air bubbles between the buffer film 10 and the display panel 20 can be moved to the edge of the buffer film 10 and the display panel 20 through the first protrusions 41 and the gaps between adjacent first protrusions 41 and discharged, so that the buffer film 10 and the display panel 20 are tightly laminated and the display effect of the display panel 20 is improved. All or part of the first protrusions 41 are deformed, and under the action of gravity or the lamination pressure, the first protrusions 41 are flattened to form a surface adapted to the display panel 20. That is, the rheological layer 4 is flattened and planarized, and the rheological layer 4 has a buffering function to buffer the pressure received by the display panel 20 when the buffer film 10 is attached to the display panel 20. In the process of laminating the rheological layer 4 and the display panel 20, the rheological layer 4 can also prevent the lamination pressure from damaging the display panel 20.

[0041] In the buffer film 10 provided in the present application, by providing the rheological layer 4 and the buffer layer 2 having a buffering capacity, the rheological layer 4 and the buffer layer 2 can buffer the pressure received by the display panel 20 when the buffer film 10 is attached to the display panel 20; by providing the isolation layer 3 to isolate the buffer layer 2 and the rheological layer 4, the buffer layer 2 and the rheological layer 4 can be deformed on opposite sides of the isolation layer 3 under the action of an external force, so that the deformed buffer layer 2 does not affect or hinder the movement of air bubbles between the buffer film 10 and the display panel 20 in the process of laminating the buffer film 10 and the display panel 20; by providing a plurality of first protrusions 41 on the rheological layer 4, it is beneficial for the air bubbles between the buffer film 10 and the display panel 20 to move to the edge of the buffer film 10 and be discharged, thereby improving the display effect of the display panel 20.

[0042] In some embodiments, the minimum distance between adjacent first protrusions 41 is d1, and d1 is 30-40 microns. Specifically, d1 can be 30 microns, 32 microns, 34 microns, 36 microns, 38 microns or 40 microns.

[0043] The gap between adjacent first protrusions 41 constitutes a channel for the movement of air bubbles. If d1 is too large, the adjacent first protrusions 41 deformed under the action of the lamination pressure cannot be connected, which increases the time required for the rheological layer 4 to be flattened. If d1 is too small, the adjacent first protrusions 41 are easily deformed into the same plane under the action of the lamination pressure, which is not conducive to the discharge of air bubbles between the buffer film 10 and the display panel 20. In the present application, d1 is set to 30-40 microns, which is beneficial for the discharge of air bubbles.

[0044] In some embodiments, the first protrusions 41 have a height H1 from the support layer 1 to the buffer layer 2, and H1 is 10-40 microns, specifically, 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, or 40 microns.

[0045] The gap between adjacent first protrusions 41 forms a channel for the movement of the bubbles, and the greater H1 is, the greater the depth of the channel is; the smaller H1 is, the smaller the depth of the channel is. If H1 is too large, the bubbles are prone to be trapped between adjacent first protrusions 41, which is not conducive to the discharge of the bubbles between the buffer film 10 and the display panel 20, and the flow leveling of the flowable layer 4 requires a longer time. If H1 is too small, adjacent first protrusions 41 are prone to be deformed into the same plane under the action of the lamination pressure, which is not conducive to the discharge of the bubbles between the buffer film 10 and the display panel 20. In the present application, by setting H1 to be 10-40 microns, the discharge of the bubbles is facilitated.

[0046] In some embodiments, the plurality of first protrusions 41 are arranged in an array.

[0047] The first protrusions 41 can include dot-shaped protrusions, strip-shaped protrusions, etc., and the plurality of first protrusions 41 are arranged in an array to make the flowable layer 4 flat. Specifically, when the first protrusions 41 are dot-shaped protrusions, in some embodiments, the orthographic projection of the first protrusions 41 on the support layer 1 can be a rhombus, a triangle, a circle, etc., which can be selected by the person skilled in the art as needed.

[0048] Referring to FIG. 3, in some embodiments, the first protrusions 41 include strip-shaped protrusions, and the plurality of strip-shaped protrusions extend along a preset direction and are sequentially and spaced apart.

[0049] In the buffer film 10 laminated to the display panel 20, the preset direction can be along the length direction or the width direction of the display panel 20, or a direction intersecting the length direction and the width direction. In the process of laminating the buffer film 10 and the display panel 20, the lamination pressure can be applied by moving a roller along the preset direction or a direction perpendicular to the preset direction to drive the bubbles to move to the edge of the buffer film 10 for discharge.

[0050] For example, adjacent first protrusions 41 are spaced apart along a first direction X, and the first protrusions 41 extend along a second direction Y. In the process of laminating the buffer film 10 and the display panel 20, the lamination pressure is applied by moving a roller along the first direction from the center to the edge of the buffer film 10 to drive the bubbles to move to the edge of the buffer film 10 for discharge.

[0051] In some embodiments, a gap is formed between adjacent first protrusions 41, and the first protrusions 41 have a notch 46 communicating the two adjacent gaps.

[0052] The length of the strip-shaped protrusions can be consistent with the length of the rheological layer 4. The first protrusions 41 have notches 46 that connect adjacent gaps, so that the bubbles can move over the first protrusions 41 and also move through the notches 46, facilitating the movement of the bubbles. In the arrangement direction of the plurality of first protrusions 41, the adjacent notches 46 can be distributed in a staggered manner.

[0053] In some embodiments, the first protrusions 41 include strip-shaped protrusions, and the plurality of strip-shaped protrusions diverge outward from the same intersection point.

[0054] The plurality of first protrusions 41 can form a radial pattern. During the process of attaching the buffer film 10 and the display panel 20, the roller can move outward from the intersection point to apply an attachment pressure to drive the bubbles to move to the edge of the buffer film 10 and be discharged.

[0055] Referring to FIG. 5, in some embodiments, the first protrusions 41 include grid-shaped protrusions.

[0056] The plurality of first protrusions 41 can extend in the width direction and the length direction of the display panel 20 to form grid-shaped protrusions, so that the rheological layer 4 is a grid layer. The grid-shaped protrusions facilitate the peristalsis of the rheological layer 4 and improve the exhaust speed.

[0057] In some embodiments, the shape of the cross section of the first protrusions 41 in the direction from the support layer 1 to the buffer layer 2 includes one or more of a rectangle, a trapezoid, a sector, and a triangle.

[0058] A person skilled in the art can select the first protrusions 41 with the required cross section as needed. When the first protrusions 41 are attached to the display panel 20, the first protrusions 41 with different cross sections have different initial contact surface areas with the display panel 20.

[0059] In some embodiments, the surface of the first protrusions 41 away from the support layer 1 is a curved surface that protrudes away from the support layer 1, so that the curved surface of the first protrusions 41 can be in contact with the plane or curved surface of the display panel 20, increasing the minimum value of the surface area of the mutual contact between the first protrusions 41 and the display panel 20, and facilitating the discharge of the bubbles.

[0060] In some embodiments, the plurality of first protrusions 41 are connected at one end close to the support layer 1 to avoid the bubbles generated being stuck between adjacent first protrusions 41.

[0061] Referring to FIG. 4, in some embodiments, the buffer film 10 has a first region 42 and a second region 43, the second region 43 is separately arranged on opposite sides of the first region 42, and the first protrusions 41 are arranged at least in the second region 43.

[0062] The first protrusions 41 can be arranged only in the second area 43, or can be arranged in both the first area 42 and the second area 43 as needed. Arranging the first protrusions 41 in the second area 43 is conducive to discharging air bubbles from the edge of the buffer film 10.

[0063] In some embodiments, the distribution density of the first protrusions 41 in the first area 42 is less than or equal to the distribution density of the first protrusions 41 in the second area 43.

[0064] In the case where the display panel 20 is a curved screen, the display panel 20 has a non-bending display area 21 and a bending display area 22, and part or all of the bending display area 22 of the display panel 20 has a curved arc surface. The first area 42 can correspond to the non-bending display area 21, and the second area 43 can correspond to the bending display area 22 having an arc surface. The buffer film 10 attached to the bending display area 22 is bent into a matching arc. When the display panel 20 and the buffer film 10 are attached, the second area 43 of the buffer film 10 contacts the display panel 20 first. By arranging the distribution density of the first protrusions 41 in the first area 42 to be less than or equal to the distribution density of the first protrusions 41 in the second area 43, the possibility of air bubbles being trapped in the first area 42 is reduced, and air bubbles are discharged from the edge of the buffer film 10. Arranging the distribution density of the first protrusions 41 in the first area 42 to be less than the distribution density of the first protrusions 41 in the second area 43 also adjusts the thickness of the first protrusions 41 after leveling, so that the thickness of the rheological layer 4 of the first area 42 after leveling is less than the thickness of the rheological layer 4 of the second area 43, which is conducive to improving the pressure resistance of the bending display area 22 opposite the second area 43.

[0065] In some embodiments, the H1 of the first protrusions 41 in the first area 42 is less than the H1 of the first protrusions 41 in the second area 43, which is conducive to leveling the first protrusions 41 in the first area 42 and reducing the possibility of air bubbles being trapped in the first area 42, and air bubbles are discharged from the edge of the buffer film 10.

[0066] In some embodiments, the d1 of the first protrusions 41 in the first area 42 is greater than the d1 of the first protrusions 41 in the second area 43, which is conducive to leveling the first protrusions 41 in the first area 42 and reducing the possibility of air bubbles being trapped in the first area 42, and air bubbles are discharged from the edge of the buffer film 10.

[0067] Referring to FIG. 6, in some embodiments, the material of the rheological layer 4 includes one or more of silicone gel and acrylic resin.

[0068] Both silicone gel and acrylic resin have good fluidity, so that the rheological layer 4 not only has a buffering function, but also can level under external force.

[0069] The rheological layer 4 can only include the first convex part 41, as shown in FIG. 6, that is, the isolation layer 3 can be exposed from the gap between adjacent first convex parts 41.

[0070] Referring to FIG. 7, in some embodiments, the rheological layer 4 further includes a substrate layer 44, and the first convex part 41 protrudes from the substrate layer 44 to the direction away from the support layer 1.

[0071] In the case that the height H1 of the first convex part 41 is limited, the thickness of the leveling rheological layer 4 can be increased by setting the substrate layer 44, and the buffering capacity of the rheological layer 4 can be improved. The substrate layer 44 can be made of the same or different material as the first convex part 41. Optionally, the substrate layer 44 includes one or more of silicone gel and acrylic resin.

[0072] In some embodiments, the height H2 of the rheological layer 4 along the support layer 1 to the buffer layer 2 is 10 microns to 50 microns, and specifically can be 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns or 50 microns.

[0073] In the case that the substrate layer 44 is provided, the height of the rheological layer 4 is the combined height of the substrate layer 44 and the first convex part 41. In the case that only the first convex part 41 is provided, the height of the rheological layer 4 is the height of the first convex part 41. If H2 is too large, the deformation amplitude of the rheological layer 4 under the lamination pressure is large, which is not conducive to the movement of the bubbles. If H2 is too small, the leveling rheological layer 4 cannot cover the entire display panel 20 under the lamination pressure. H2 is set to 10 microns to 50 microns to balance the favorable bubble discharge and the leveling rheological layer 4 covering the entire display panel 20.

[0074] In some embodiments, the modulus of the rheological layer 4 is 100 kpa to 200 kpa, and specifically can be 100 kpa, 120 kpa, 140 kpa, 160 kpa, 180 kpa or 200 kpa, so that the rheological layer 4 can have the first convex part 41 with the required shape, can be leveled under the action of external force, and has the buffering capacity. Unless otherwise specified, the "modulus" described in the present application is the Young's modulus.

[0075] Referring to FIG. 8 and FIG. 9, in some embodiments, the buffer film 10 further includes a release layer 5, and the release layer 5 is arranged on the side of the rheological layer 4 away from the support layer 1.

[0076] The rheological layer 4 can have certain viscosity, and the release layer 5 is used to isolate other components that are not required to be attached to the rheological layer 4 from contacting the rheological layer 4, so as to facilitate the transportation and storage of the buffer film 10. When the buffer film 10 is used, the release layer 5 can be torn off, and then the rheological layer 4 is laminated with the display panel 20.

[0077] In some embodiments, the release layer 5 includes a second recess 52 corresponding to the first protrusion 41.

[0078] In the process of preparing the buffer film 10, the material for forming the rheological layer 4 can be disposed on the side of the isolation layer 3 away from the buffer layer 2, and the release layer 5 with the second recess 52 is attached, and the second recess 52 with the preset structure gives the material for forming the rheological layer 4 to form the first protrusion 41, so that the release layer 5 also has the function of preparing and maintaining the first protrusion 41.

[0079] In some embodiments, the first protrusion 41 circumscribes the first recess 45, and the release layer 5 includes a limiting protrusion 51 protruding towards the support layer 1, and the limiting protrusion 51 corresponds to the first recess 45 and is embedded in the first recess 45, and the limiting protrusion 51 circumscribes the second recess 52.

[0080] When the first protrusion 41 is in a mesh structure, the first recess 45 can be a mesh hole in the mesh structure, and the limiting protrusion 51 is inserted into each mesh hole, and the first protrusion 41 is plasticized by the limiting protrusion 51.

[0081] Referring to FIG. 10, the support layer 1 can provide support for the buffer film 10, and the support layer 1 can include a metal material and / or a non-metal material. The metal material can be a copper foil, an aluminum foil, stainless steel, etc., and the non-metal material can be at least one of polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polyimide (PI), polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate (PC), and polypropylene (PP). In some embodiments, the material of the support layer 1 includes one or more of the metal material and polyethylene terephthalate.

[0082] In some embodiments, the height of the support layer 1 from the support layer 1 to the buffer layer 2 is H3, and H3 is greater than 15 microns to ensure that the support layer 1 has sufficient support.

[0083] In some embodiments, H3 is 15 microns to 50 microns, and specifically can be 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, or 50 microns.

[0084] If H3 is too large, the support layer 1 will have too large a modulus, making it difficult for the buffer film 10 to be bent into an arc shape that fits the display panel 20.

[0085] In some embodiments, the modulus of the support layer 1 is greater than the modulus of the buffer layer 2, so that the support layer 1 has sufficient support and the buffer layer 2 has sufficient buffering capacity.

[0086] In some embodiments, the modulus of the support layer 1 is 80Gpa-200Gpa, and specifically can be 80Gpa, 100Gpa, 120Gpa, 140Gpa, 160Gpa, 180Gpa, 200Gpa, to provide appropriate support capacity and take into account the possibility of being bent into an arc shape that fits the display panel 20.

[0087] In some embodiments, the buffer layer 2 includes a silicone gel.

[0088] The silicone gel is a low cross-linking density silicone rubber. The silicone gel has low mechanical strength, is resistant to high and low temperatures, and has vibration absorption capacity, so that when the buffer film 10 is attached to the display panel 20, the display panel 20 can be provided with a buffering capacity to reduce or avoid damage to the display panel 20 by external forces.

[0089] In some embodiments, the buffer layer 2 also includes an adhesive mixed with the silicone gel.

[0090] Mixing the adhesive in the silicone gel makes the buffer layer 2 have adhesion, and the buffer layer 2 can bond the support layer 1 and the isolation layer 3, improving the stability of the support layer 1, the buffer layer 2, and the isolation layer 3.

[0091] In other embodiments, the buffer film 10 also includes an adhesive layer that bonds the buffer layer 2 and the isolation layer 3.

[0092] The adhesive layer 6 with adhesion is provided on one side of the buffer layer 2, and the adhesive layer 6 bonds the buffer layer 2 and the isolation layer 3, so that the buffer layer 2 can be provided with no or less adhesion, improving the buffering capacity of the buffer layer 2.

[0093] In some embodiments, the height of the buffer layer 2 along the support layer 1 to the buffer layer 2 is H4, and the height of the rheological layer 4 along the support layer 1 to the buffer layer 2 is H2, H4>H2.

[0094] The buffer layer 2 and the rheological layer 4 can be made of the same material, H4>H2, so that the buffer layer 2 is the main structural layer that provides the buffering capacity of the buffer film 10, and the rheological layer 4 is the secondary structural layer that provides the buffering capacity of the buffer film 10.

[0095] In some embodiments, H4 is 125 microns to 135 microns, and specifically, can be 125 microns, 127 microns, 129 microns, 131 microns, 133 microns, or 135 microns, so that the buffer layer 2 can provide sufficient buffering capacity for the buffer film 10. In the case where H4 is 125 microns to 135 microns, if the buffer layer 2 is directly attached to the display panel 20, because the buffer layer 2 has a relatively high height, the buffer layer 2 is prone to large deformation, which can easily cause the bubbles generated by the attachment between the buffer film 10 and the display panel 20 to be blocked by the deformed buffer film 10, and the bubbles cannot be discharged. By attaching the rheological layer 4 with a height of H2 to the display panel 20, because H4 > H2, the deformation of the rheological layer 4 is smaller than that of the buffer layer 2, and the bubbles generated by the attachment between the buffer film 10 and the display panel 20 can move to the edge of the buffer film 10 through the rheological layer 4.

[0096] In some embodiments, the modulus of the buffer layer 2 is 100 kpa to 200 kpa, and specifically, can be 100 kpa, 120 kpa, 140 kpa, 160 kpa, 180 kpa, or 200 kpa, so that the buffer layer 2 has excellent buffering performance.

[0097] In some embodiments, the material of the isolation layer 3 includes at least one of polyethylene terephthalate, acrylonitrile-butadiene-styrene copolymer, polyimide, polyethylene, polymethacrylate, polycarbonate, and polypropylene, so that the isolation layer 3 can isolate the buffer layer 2 and the rheological layer 4.

[0098] In some embodiments, the height of the isolation layer 3 from the support layer 1 to the buffer layer 2 is H5, and H5 is 40 microns to 50 microns, and specifically, can be 40 microns, 43 microns, 45 microns, 48 microns, or 50 microns, so that the isolation layer 3 can isolate the buffer layer 2 and the rheological layer 4, and avoid the isolation layer 3 from being broken under external force.

[0099] In some embodiments, the height of the support layer 1 from the support layer 1 to the buffer layer 2 is H3, and H3 > H5.

[0100] In some embodiments, the modulus of the support layer 1 is greater than the modulus of the isolation layer 3.

[0101] The support layer 1 and the isolation layer 3 can be made of the same material, H3 > H5, and / or the modulus of the support layer 1 is greater than the modulus of the isolation layer 3, so that the support layer 1 is the main structural layer for providing support force in the buffer film 10, and the isolation layer 3 is the secondary structural layer for providing support force in the buffer film 10.

[0102] In some embodiments, the modulus of the isolation layer 3 is 3000-8000 MPa, and specifically can be 3000 MPa, 4000 MPa, 5000 MPa, 6000 MPa, 7000 MPa, or 8000 MPa, so that the isolation layer 3 can be adapted to the bending of the display panel 20 into an arc shape.

[0103] In a second aspect, the embodiments of the present application also provide a display device, referring to FIG. 11, the display device includes a display panel 20 and the buffer film 10 provided in the first aspect, at least part of the buffer film 10 is attached to the display panel 20, and the rheological layer 4 is stacked between the isolation layer 3 and the display panel 20.

[0104] The display panel 20 can include an array substrate 23, a light emitting device layer 24, a cover plate 25, etc., the light emitting device layer 24 is a functional layer with light emitting display capability, and the light emitting device layer 24 includes a pixel definition layer and a plurality of light emitting units, the pixel definition layer includes a plurality of pixel openings, and the light emitting units are arranged in the pixel openings. For example, the embodiments of the present application can select an organic light emitting diode (OLED) to prepare the light emitting units. Alternatively, the light emitting units can also be arranged as micro light emitting diodes (Micro-LED) or quantum dot light emitting diodes (QLED).

[0105] Specifically, the display panel 20 can further include a support film located on the side of the array substrate 23 away from the light emitting device layer 24. The buffer film 10 is attached to the backlight surface of the display panel 20, and can be attached to the support film in the display panel 20.

[0106] In the case that the buffer film 10 has the release layer 5, the release layer 5 can be peeled off, and the rheological layer 4 is attached to the display panel 20 to obtain the display device.

[0107] The display device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, etc. having the display panel 20, and can also be a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc., and the embodiments of the present application are not limited in this regard.

[0108] In the display device provided by the embodiments of the present application, the display panel 20 has the related structures described above, and can refer to the display panel 20 provided by the embodiments described above, and has the beneficial effects of the display panel 20 described above, which will not be repeated here.

[0109] In some embodiments, the display panel 20 has a non-bending display area 21 and a bending display area 22 connected to the non-bending display area 21, and the display panel 20 comprises a bonding surface bonded to the rheological layer 4, at least part of the bonding surface in the bending display area 22 is arc-shaped.

[0110] Part or all of the bending display area 22 of the display panel 20 has a curved arc-shaped surface, so that the display area of the display panel 20 is increased under the condition of the same size of the display device. At least part of the bonding surface in the bending display area 22 is arc-shaped, and the buffer film 10 is adapted to the bending of the arc-shaped bonding surface.

[0111] In some embodiments, the buffer film 10 is stacked on the bonding surface in the bending display area 22.

[0112] The buffer film 10 can not be arranged on one side of the non-bending display area 21, and the buffer film 10 protects the bending display area 22 of the display panel 20.

[0113] In some embodiments, the surface of the rheological layer 4 away from the support layer 1 is a smooth surface adapted to the display panel 20.

[0114] Under the action of the bonding pressure and gravity, the first convex part 41 of the rheological layer 4 is flattened to form a smooth surface adapted to the display panel 20,

[0115] In some embodiments, the first region 42 at least partially overlaps the non-bending display area 21 in the orthographic projection of the display panel 20, and the second region 43 at least partially overlaps the bending display area 22 in the orthographic projection of the display panel 20.

[0116] The first region 42 in the buffer film 10 can be bonded to the non-bending display area 21, and the second region 43 can be bonded to the bending display area 22, and the buffer film 10 attached to the bending display area 22 is bent to an adapted arc shape.

[0117] Referring to FIG. 12, in a third aspect, the embodiments of the present application further provide a preparation method of a display device, the preparation method comprising:

[0118] S100, providing a display panel 20, the display panel 20 having a backlight surface and a light-emitting surface arranged oppositely;

[0119] S200, placing the buffer film 10 provided in the first aspect on the backlight surface of the display panel 20, and the first convex part 41 faces the display panel 20;

[0120] S300, pressing the buffer film 10 and the display panel 20 to make the rheological layer 4 attached to the backlight surface.

[0121] In the preparation method of the display panel 20 provided in the embodiments of the present application, the display device provided in the second aspect can be prepared, which has the related structure of the buffer film 10 described in the embodiments, and has all the beneficial effects of the buffer film 10, which will not be described herein again.

[0122] In some embodiments, S300 comprises:

[0123] The control roller rolls from the middle of the buffer film 10 to the edge of the buffer film 10, and the rheological layer 4 is attached to the backlight surface. The first convex part 41 of the rheological layer 4 is flattened to form a smooth surface matched with the backlight surface.

[0124] The first convex part 41 is flattened, so that the rheological layer 4 can be closely attached to the backlight surface.

[0125] According to the embodiments of the present application, these embodiments do not describe all the details, and do not limit the present application to only the specific embodiments. Obviously, according to the description, many modifications and changes can be made. The embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well use the present application and make modifications on the basis of the present application. The present application is limited by the claims and their entire scope and equivalents.

Claims

1. A cushioning film for being arranged on one side of a display panel, the cushioning film comprising: a support layer; a cushioning layer arranged on one side of the support layer; an isolation layer arranged on one side of the cushioning layer away from the support layer; a rheological layer arranged on one side of the isolation layer away from the support layer, the rheological layer comprising a plurality of first protrusions protruding in a direction away from the support layer, the rheological layer being configured to be attached to the display panel. A minimum distance between adjacent first protrusions is d1, and d1 is 30 microns to 40 microns. A height of the first protrusions along the support layer to the cushioning layer is H1, and H1 is 10 microns to 40 microns. A surface of the first protrusions away from the support layer is a curved surface protruding in a direction away from the support layer. The cushioning film has a first region and a second region, and the second region is arranged on opposite sides of the first region.

2. The cushioning film of claim 1, wherein, The first protrusions are arranged at least in the second region.

3. The cushioning film of claim 1, wherein, A distribution density of the first protrusions in the first region is less than or equal to a distribution density of the first protrusions in the second region.

4. The cushioning film of claim 1, wherein, A height of the first protrusions along the support layer to the cushioning layer is H1, and H1 of the first protrusions in the first region is less than H1 of the first protrusions in the second region.

5. The cushioning film of claim 1, wherein, A minimum distance between adjacent first protrusions is d1, and d1 of the first protrusions in the first region is greater than d1 of the first protrusions in the second region. The rheological layer further comprises a substrate layer, and the first protrusions protrude in a direction away from the support layer from the substrate layer.

6. The cushioning film of claim 5, wherein, The cushioning film further comprises:

7. The cushioning film of claim 5, wherein, a release layer arranged on one side of the rheological layer away from the support layer, and the release layer comprises second recesses corresponding to the first protrusions.

8. The cushioning film of claim 5, wherein, The first protrusions form first recesses, and the release layer comprises limiting protrusions protruding in a direction close to the support layer, the limiting protrusions correspond to the first recesses, and the limiting protrusions form the second recesses.

9. The cushioning film of claim 1, wherein, A modulus of the support layer is greater than a modulus of the cushioning layer, and the modulus of the support layer is 80 Gpa to 200 Gpa.

10. The cushioning film of claim 1, wherein, The cushioning layer comprises a silica gel, and the cushioning layer further comprises an adhesive mixed with the silica gel. The cushioning film further comprises an adhesive layer, and the adhesive layer bonds the cushioning layer and the isolation layer.

11. The cushioning film of claim 10, wherein, A height of the cushioning layer along the support layer to the cushioning layer is H4, and a height of the rheological layer along the support layer to the cushioning layer is H2, and H4 > H2.

12. The cushioning film of claim 1, wherein, A modulus of the support layer is greater than a modulus of the isolation layer, and the modulus of the isolation layer is 3000 Mpa to 8000 Mpa.

13. The cushioning film of claim 1, wherein, 17.A display device, comprising:

14. The cushioning film of claim 1, wherein, a display panel; 15. The cushioning film of claim 1, wherein, the cushioning film of claim 1, at least part of the cushioning film being attached to the display panel, and the rheological layer being arranged between the isolation layer and the display panel.

16. The cushioning film of claim 1, wherein, A surface of the rheological layer away from the support layer is a smooth surface adapted to the display panel. ​ ​ ​ 18. The display device of claim 17, wherein, ​ 19. The display device of claim 17, wherein, A normal projection of the first area on the display panel at least partially overlaps with the non-bending display area, and a normal projection of the second area on the display panel at least partially overlaps with the bending display area. 20.A method for manufacturing a display device, the method comprising: providing a display panel having a back light surface and a light emitting surface arranged oppositely; placing the buffer film as claimed in claim 1 on the back light surface of the display panel, the first protrusion facing the display panel; pressing the buffer film and the display panel to attach the rheological layer on the back light surface.

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