Method for preparing foldable display panel and display device

Abstract

The present invention proposes a method for preparing a foldable display panel and a display device, the method comprising: setting a back film on a side of the display panel away from the light-emitting side, the display panel comprising a display area and a non-display area, the non-display area comprising a bending area connected to the display area and a binding area connected to the bending area, the back film covering the display area and the non-display area; forming a hollow area on the back film, the orthographic projection of the hollow area on the display panel is smaller than the orthographic projection of the bending area on the display panel; bending the display panel along the bending area to the side away from the light-emitting side. As a result, the display panel obtained by the method is foldable in the display area, the display panel frame is narrower, the precision requirement in the back film bonding process is lower, the display panel preparation method is simpler, and the labor cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular, to a method for preparing a foldable display panel and a display device. Background Art

[0002] In a flexible organic light-emitting diode display, the polarizer, flexible display panel and back film are bonded together. To achieve a narrow frame, the end of the display panel connected to the external circuit can be bent. The back film of the current display panel is a small slotted piece, and then the slotted back film is bonded to the display panel. Due to the existence of tolerance, a certain space needs to be reserved during the back film bonding process, which is not conducive to the formation of a narrow frame.

[0003] Therefore, the current method for preparing foldable display panels still needs further improvement. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one object of the present invention is to provide a method for preparing a foldable display panel. The display panel obtained by the method is foldable in the display area, the display panel frame is narrower, the precision requirement during the back film bonding process is lower, the display panel preparation method is simpler, and the labor cost can be reduced.

[0005] In one aspect of the present invention, a method for preparing a foldable display panel is proposed, comprising: disposing a back film on a side of the display panel away from the light emitting side, the display panel comprising a display area and a non-display area, the non-display area comprising a bending area connected to the display area and a binding area connected to the bending area, the back film covering the display area and the non-display area; forming a hollow area on the back film, the orthographic projection of the hollow area on the display panel being smaller than the orthographic projection of the bending area on the display panel; and bending the display panel along the bending area to the side away from the light emitting side.

[0006] In the process of preparing the foldable display panel involved in the present invention, the entire back film is bonded to the side of the display panel away from the light-emitting side. After bonding is completed, a hollow area is formed at a predetermined position, and the back film in the hollow area is removed. This process avoids the tolerance formed by making the hollow area before bonding the back film, and also avoids the tolerance formed by alignment during the bonding of the back film, which can reduce the frame width and is conducive to the production of narrow-frame products. At the same time, since the hollow area is formed after the back film is bonded, there is no need to align the hollow area during the bonding process of the back film, which reduces the alignment accuracy, makes the bonding of the back film simpler and easier to operate, and can reduce the labor cost to a certain extent.

[0007] According to some embodiments of the present invention, the bending zone includes a first area, a second area, and a third area connected in sequence, the first area is connected to the display area, the third area is connected to the binding area, the end of the second area connected to the first area forms a starting end of the bend, the end of the second area connected to the third area forms an end of the bend, and the orthographic projection of the hollow area on the display panel is larger than the orthographic projection of the second area on the display panel.

[0008] According to some embodiments of the present invention, an adhesive layer is formed on the side of the back film close to the display panel, the back film includes a folding area and a cutting area, the hollow area is formed in the cutting area, and the elastic modulus of the adhesive layer in the folding area is greater than the elastic modulus of the adhesive layer in the cutting area.

[0009] According to some embodiments of the present invention, the elastic modulus of the adhesive layer in the folding area is 2 GPa-10 GPa, and the elastic modulus of the adhesive layer in the cutting area is 10 kPa-100 kPa.

[0010] According to some embodiments of the present invention, the adhesive layer in the cutting area satisfies at least one of the following conditions: before ultraviolet light irradiation, the adhesion of the adhesive layer is <50gf / 25mm; after ultraviolet light irradiation, the adhesion of the adhesive layer is >800gf / 25mm.

[0011] According to some embodiments of the present invention, the method for preparing a foldable display panel further includes: providing a substrate, the substrate including a first substrate and a second substrate; providing a first barrier layer, the first barrier layer being located between the first substrate and the second substrate, and providing a second barrier layer, the second barrier layer being located on a side of the second substrate away from the first barrier layer; providing a backplane circuit structure, the backplane circuit structure including an active layer, a first gate insulation layer, a gate metal layer, a second gate insulation layer, a first source and drain metal layer, an interlayer dielectric layer and a second source and drain metal layer, the backplane circuit structure constituting a thin film transistor and a capacitor in the gate drive circuit; removing the second barrier layer, the first gate insulation layer, the second gate insulation layer, and the interlayer dielectric layer in the bending area of ​​the display panel to form a groove, and filling the groove with organic matter.

[0012] According to some embodiments of the present invention, the method for preparing a foldable display panel further includes: disposing a protective layer on a side of the display panel facing the light emitting side, wherein the protective layer covers at least a portion of the bending zone.

[0013] According to some embodiments of the present invention, the method for preparing a foldable display panel further includes: disposing a control chip on a side of the display panel facing the light emitting side, wherein the control chip is located in the binding area.

[0014] In another aspect of the present invention, a display device is proposed, comprising: a display panel, the display panel comprising a display area and a non-display area, the non-display area comprising a bending area connected to the display area and a binding area connected to the bending area; a back film, the back film is arranged on a side of the display panel away from the light emitting side, the back film comprises a folding area and a cutting area, the display panel in the folding area can be folded toward the side away from the light emitting side, the hollow area is formed in the cutting area, the orthographic projection of the hollow area on the display panel is smaller than the orthographic projection of the bending area on the display panel; an adhesive layer, the adhesive layer is arranged between the back film and the display panel, the elastic modulus of the adhesive layer in the folding area is smaller than the elastic modulus of the adhesive layer in the cutting area, and the adhesive layer in the cutting area satisfies at least one of the following conditions: before ultraviolet light irradiation, the adhesive force of the adhesive layer is <50gf / 25mm; after the ultraviolet light irradiation, the adhesive force of the adhesive layer is >800gf / 25mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 A schematic diagram showing the structure of a display panel according to an embodiment of the present invention is shown;

[0017] Figure 2 A schematic diagram showing a process flow of a method for preparing a foldable display panel according to an embodiment of the present invention;

[0018] Figure 3 A schematic diagram showing the structure of a bending area of ​​a display panel according to an embodiment of the present invention;

[0019] Figure 4 A schematic diagram showing metal routing according to an embodiment of the present invention is shown;

[0020] Figure 5 A schematic diagram of the structure of a display panel after being bent according to an embodiment of the present invention is shown.

[0021] Reference numerals:

[0022] 1000: display panel; A: display area; B: non-display area; B1: bending area; B11: first area; B12: second area; B13: third area; B2: binding area; 2000: back film; C: hollow area; D: folding area; E: cutting area; 1100: first substrate; 1200: first blocking layer; 1300: second substrate; 1400: second blocking layer; 1510: first gate insulating layer; 1520: second gate insulating layer; 1610: first source-drain metal layer; 1620: second source-drain metal layer; 1700: interlayer dielectric layer; 1800: organic matter; 3000: protective layer; 4000: control chip; 5000: polarizer; 6000: first bonding layer; 7000: substrate; 8000: second bonding layer. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0024] In one aspect of the present invention, a method for preparing a foldable display panel is provided, referring to Figure 1 The method comprises: disposing a back film 2000 on a side of the display panel 1000 away from the light emitting side, the display panel 1000 comprises a display area A and a non-display area B, the non-display area B comprises a bending area B1 connected to the display area A and a binding area B2 connected to the bending area B1, the back film 2000 covers the display area A and the non-display area B; forming a hollow area C on the back film 2000, the orthographic projection of the hollow area C on the display panel 1000 is smaller than the orthographic projection of the bending area B1 on the display panel 1000, and finally bending the display panel 1000 along the bending area B1 to the side away from the light emitting side ( Figure 2 The structure after bending is not shown in the figure). Thus, the display panel 1000 obtained by the method is foldable in the display area A, the frame of the display panel 1000 is narrower, the precision requirement during the lamination process of the back film 2000 is lower, the manufacturing method of the display panel 1000 is simpler, and the labor cost can be reduced.

[0025] The following is a detailed description of the principle by which the present application can achieve the above beneficial effects:

[0026] In the related art, the back film 2000 of the display panel 1000 is first made into a small grooved piece and then attached to the display panel 1000. During the groove making process, there is a certain tolerance (material tolerance) due to the mold and process reasons. When the grooved back film 2000 is attached to the display panel 1000, it needs to be aligned, and a certain tolerance (alignment tolerance) will be generated during the alignment process. These two parts of the tolerance need to be taken into account when designing the frame of the display panel 1000, which increases the width of the frame of the display panel 1000 to a certain extent, which is not conducive to the formation of a narrow frame. The method for preparing the display panel 1000 proposed in the present application is to attach the entire back film 2000 to the display panel 1000, then cut the back film 2000 at a preset position of the back film 2000, and tear off part of the back film 2000 to form a hollow area C. In this way, the tolerance of the hollow area C formed before the back film 2000 is attached can be avoided, and the tolerance formed during the alignment of the back film 2000 can be avoided. In the process of designing the frame of the display panel 1000, there is no need to consider these two parts of tolerance, and the width of the frame can be reduced. When the material tolerance of the back film 2000 is a and the alignment tolerance is b, the combined tolerance is:

[0027]

[0028] That is, in the process of designing the frame of the display panel 1000, there is no need to reserve the length of the combined tolerance, which is more conducive to forming a narrow frame product. Since a certain tolerance e will also be generated in the process of forming the hollow area C, the tolerance that can actually be reduced by the method proposed in this application is:

[0029]

[0030] In addition, since there is no need to align the hollow area C during the lamination process of the back film 2000, the alignment accuracy during lamination can be reduced, making the lamination of the back film 2000 simpler and easier to operate, thereby reducing labor costs.

[0031] The following is a detailed description of each step of the method proposed in this application, referring to Figure 2 , the method comprising:

[0032] S100: Laminating the entire back film to the display panel

[0033] In this step, refer to Figure 1 A polarizer layer 5000 is disposed on the light-emitting side of the display panel 1000, and a back film 2000 is disposed on the side of the display panel 1000 away from the light-emitting side. The display panel 1000 includes a display area A and a non-display area B, the non-display area B includes a bending area B1 connected to the display area A and a binding area B2 connected to the bending area B1, and the back film 2000 covers the display area A and the non-display area B.

[0034] S200: Forming a hollow area

[0035] In this step, refer to Figure 1 , a hollow area C is formed on the back film 2000, and the orthographic projection of the hollow area C on the display panel 1000 is smaller than the orthographic projection of the bending area B1 on the display panel 1000, that is, the projection of the hollow area C on the display panel 1000 falls within the range of the orthographic projection of the bending area B1 on the display panel 1000. According to some embodiments of the present invention, the back film 2000 includes a folding area D and a cutting area E, and the hollow area C is formed in the cutting area E.

[0036] According to some embodiments of the present invention, a bonding layer (not shown in the figure) is formed on the side of the back film 2000 facing the display panel 1000, and the elastic modulus of the bonding layer in the folding area D is smaller than the elastic modulus of the bonding layer in the cutting area E. Therefore, the bonding layer in the folding area D has a smaller elastic modulus, and the elastic modulus of the bonding material is greatly improved after curing, so that the bonding layer in the folding area D has better flexibility, and the display panel 1000 in the corresponding folding area D can be folded toward the side away from the light emitting side to form a foldable display panel 1000.

[0037] According to some specific embodiments of the present invention, the specific range of the elastic modulus of the adhesive layer in the folding area D and the cutting area E is not particularly limited. Those skilled in the art can select a suitable adhesive according to actual conditions. Specifically to the present invention, the elastic modulus of the adhesive layer in the folding area D can be 10kpa~100kpa, and the elastic modulus of the adhesive layer in the cutting area E can be 2GPa~10GPa, so as to better meet the needs of folding and cutting.

[0038] According to some embodiments of the present invention, the method for forming the hollow area C is not particularly limited, for example, the hollow area C can be formed by laser cutting. According to some specific embodiments of the present invention, when the hollow area C is formed by laser cutting, the adhesive layer of the cutting area E satisfies at least one of the following conditions: before ultraviolet light irradiation, the adhesive force of the adhesive layer is <50gf / 25mm; after ultraviolet light irradiation, the adhesive force of the adhesive layer is >800gf / 25mm. Thus, after the back film 2000 is attached to the display panel 1000, since the adhesive force of the adhesive layer is small before ultraviolet light irradiation, part of the back film 2000 can be torn off after laser cutting to form the hollow area C; after the hollow area C is formed, the adhesive layer is cured by ultraviolet light irradiation, and the adhesive force of the adhesive layer is increased at this time, which can ensure that the back film 2000 is more firmly attached to the display panel 1000 and prevent the back film 2000 from falling off.

[0039] According to some embodiments of the present invention, the specific division method of the folding area D and the cutting area E is not limited. For example, the binding area B2 can be divided into a cutting area E within a range of 20 mm on one side close to the bending area B1. The adhesion of the adhesive layer within this range meets the above requirements, which can further facilitate the formation of the hollow area C and reduce the tolerance generated during the laser cutting process.

[0040] According to some embodiments of the present invention, reference Figure 1 , the bending area B1 includes a first area B11, a second area B12 and a third area B13 connected in sequence, the first area B11 is connected to the display area A, the third area B13 is connected to the binding area B2, the end of the second area B12 connected to the first area B11 forms the starting end of the bend, the end of the second area B12 connected to the third area B13 forms the end of the bend, and the orthographic projection of the hollow area C on the display panel 1000 is greater than the orthographic projection of the second area B12 on the display panel 1000. Specifically, in order to ensure that the non-display area B has a certain margin during the bending process, the designed bending area B1 needs to be larger than the actual bending area B12, that is, the bending area B1 referred to in this application is the designed bending area B1, the second area B12 is the actual bending area, the first area B11 and the third area B13 are the range of the designed bending area B1 beyond the actual bending area B12, and in order not to affect the bending of the second area B12, the width of the hollow area C needs to be greater than the width of the second area B12.

[0041] According to some embodiments of the present invention, reference Figure 3 The method for preparing the display panel 1000 further includes: providing a substrate, wherein the substrate includes a first substrate 1100 and a second substrate 1300; providing a first barrier layer 1200, wherein the first barrier layer 1200 is located between the first substrate 1100 and the second substrate 1300; providing a second barrier layer 1400, wherein the second barrier layer 1400 is located on a side of the second substrate 1300 away from the first barrier layer 1200; providing a backplane circuit structure, wherein the backplane circuit structure includes a first gate insulating layer 1510, The gate metal layer, the second gate insulating layer 1520, the first source-drain metal layer 1610, the interlayer dielectric layer 1700 and the second source-drain metal layer 1620, and the backplane circuit structure constitute the thin film transistor and the capacitor in the gate driving circuit. Since the inorganic layer has poor bending resistance, it is necessary to remove the second blocking layer 1400, the first gate insulating layer 1510, the second gate insulating layer 1520, and the interlayer dielectric layer 1700 in the bending area B1 of the display panel 1000 to form a groove, and fill the groove with organic matter 1800.

[0042] According to some embodiments of the present invention, reference Figure 1, the binding area B2 is used to bind the control chip 4000 or the flexible circuit board. Specifically, the control chip 4000 can be connected to the terminal of the binding area B2 by a method including but not limited to COF. According to other specific embodiments of the present invention, the display panel 1000 is partially bent in the bending area B1 to a side away from the light emitting side of the display panel 1000. The display panel 1000 is also provided with a metal trace in the bending area B1 to form a signal line, so that the device on the light emitting side of the display panel 1000 is connected to the binding area B2 through the signal line in the bending area B1. The form of the metal trace is not particularly limited and can be a cross trace or a straight trace (refer to Figure 4 ). Specifically, the width R2 of the metal trace is not particularly limited and can be 8.5 μm to 9.5 μm, the width R3 between two adjacent metal traces is not particularly limited and can be 5 to 6 μm, and R1 is the sum of the width of the metal trace and the width between two adjacent metal traces (R1=R2+R3), and R1 can be 13.5 μm to 15.5 μm.

[0043] The width R2 of the metal wiring is that the signal line formed by the metal wiring is easily broken when subjected to stress during bending. Therefore, a protective layer 3000 may be further provided on the side of the display panel 1000 in the bending area B1 facing the light emitting side to release bending stress.

[0044] According to some embodiments of the present invention, reference Figure 1 and Figure 5 , the protective layer 3000 covers at least part of the bending area B1 to assist in fixing the bent area. According to some embodiments of the present invention, the protective layer 3000 may be a metal covering layer (MCL adhesive layer). By providing the protective layer 3000 in the bending area B1, when the binding area B2 is bent to the side of the display panel 1000 away from the light emitting side, the stress in the bending area B1 can be reduced, and the probability of damage to the display panel 1000 can be effectively reduced. At the same time, the protective layer 3000 can also protect the metal wiring in the bending area B1. The specific position of the protective layer 3000 is not particularly limited, as long as it can extend from the bending area B1 to the side of the binding area B2 and play a role in fixing the bending area B1. For example, the protective layer 3000 can cover the entire bending area B1.

[0045] S300: bending the display panel in the bending area and fixing the binding area and the display area

[0046] In this step, refer to Figure 5, the display panel 1000 is bent along the bending area B1 to the side away from the light emitting side. Specifically, the display panel 1000 can be placed on a binding device to perform the above operation. According to some specific embodiments of the present invention, after the binding area B2 is bent to the display area A, it can be bonded by double-sided adhesive. The double-sided adhesive includes a first adhesive layer 6000, a substrate 7000 and a second adhesive layer 8000. The first adhesive layer 6000 and the second adhesive layer 8000 are respectively located on both sides of the substrate 7000. After bending, the back film 2000 on both sides of the hollow area C can be attached by the first adhesive layer 6000 and the second adhesive layer 8000, and a pressing head can be used to perform a pressing operation to firmly connect the binding area to the display area.

[0047] The beneficial effects of the present application are further described below in conjunction with specific embodiments:

[0048] According to some specific embodiments of the present invention, Figure 5 , the border area of ​​the display panel 1000 is K, the length from the display area A to the edge of the bending area B1 is G, the length from the edge of the bending area B1 to the edge of the back film 2000 is H, the length from the edge of the back film 2000 to the starting end of the bend is I, and the bending radius is L+M. Among them, the lengths of G and H are both related to the combination tolerance of the back film 2000. Since the combination tolerance of the back film 2000 includes the incoming material tolerance a and the bonding tolerance b, when the incoming material tolerance is 50μm and the bonding tolerance b is 75μm, the combination tolerance c is 90μm. In other words, 90μm must be reserved when designing the length of G, and 90μm must be reserved when designing the length of H to ensure that the back film 2000 does not enter the bending area B1. Therefore, the combination tolerance c will cause the length of K to increase by about 180μm. In this application, the entire back film 2000 is attached to the display panel 1000, and a hollow area C is formed by laser welding. The tolerance generated during the welding process is e, 30μm≤e≤50μm. In other words, the method proposed in this application can reduce the tolerance by 40μm to 60μm. The reduced tolerance can further reduce the length of the frame, which is conducive to the production of narrow-frame products.

[0049] In another aspect of the present invention, a display panel 1000 is provided, and the display panel 1000 is prepared by the above method. Therefore, the display panel 1000 has all the features and advantages of the display panel 1000 prepared by the above method, which will not be repeated here. In general, it has at least the advantages of being foldable and having a narrow frame.

[0050] In another aspect of the present invention, a display device is provided, referring to Figure 1 , which includes a display panel 1000, a back film 2000, and an adhesive layer.

[0051] The display panel 1000 includes a display area A and a non-display area B, and the non-display area B includes a bending area B1 connected to the display area A and a binding area B2 connected to the bending area B1;

[0052] The back film 2000 is disposed on a side of the display panel 1000 away from the light emitting side. The back film 2000 includes a folding area D and a cutting area E. The display panel 1000 in the folding area D can be folded toward the side away from the light emitting side. The hollow area C is formed in the cutting area E. The orthographic projection of the hollow area C on the display panel 1000 is smaller than the orthographic projection of the bending area B1 on the display panel 1000.

[0053] The adhesive layer is disposed between the back film 2000 and the display panel 1000. The elastic modulus of the adhesive layer in the folding area D is less than the elastic modulus of the adhesive layer in the cutting area E. The adhesive layer in the cutting area E satisfies at least one of the following conditions: before ultraviolet light irradiation, the adhesive force of the adhesive layer is <50gf / 25mm; after ultraviolet light irradiation, the adhesive force of the adhesive layer is >800gf / 25mm. Thus, the display device has all the features and advantages of the aforementioned display panel 1000, which will not be described in detail here. In general, it has at least the advantages of being foldable and having a narrow frame.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a foldable display panel, characterized in that: include: A back film is arranged on a side of the display panel away from the light emitting side, the display panel comprises a display area and a non-display area, the non-display area comprises a bending area connected to the display area and a binding area connected to the bending area, and the back film covers the display area and the non-display area; forming a hollow area on the back film, wherein the orthographic projection of the hollow area on the display panel is smaller than the orthographic projection of the bending area on the display panel; bending the display panel along the bending area toward a side away from the light emitting side; The bending area includes a first area, a second area, and a third area connected in sequence, the first area is connected to the display area, the third area is connected to the binding area, an end of the second area connected to the first area forms a starting end of the bending, and an end of the second area connected to the third area forms an end of the bending, and the orthographic projection of the hollow area on the display panel is larger than the orthographic projection of the second area on the display panel; A bonding adhesive layer is formed on a side of the back film facing the display panel, the back film includes a folding area and a cutting area, the hollow area is formed in the cutting area, and the elastic modulus of the bonding adhesive layer in the folding area is smaller than the elastic modulus of the bonding adhesive layer in the cutting area; The adhesive layer in the cutting area meets the following conditions: Before ultraviolet light irradiation, the adhesive force of the adhesive layer is less than 50gf / 25mm; After ultraviolet light irradiation, the adhesive force of the adhesive layer is greater than 800 gf / 25 mm.

2. The method according to claim 1, characterized in that The elastic modulus of the adhesive layer in the folding area is 10 kPa-100 kPa, and the elastic modulus of the adhesive layer in the cutting area is 2 GPa-10 GPa.

3. The method according to claim 1, characterized in that The method for forming the hollow area includes: Laser cutting the backing film to form the hollow area; The backing film is cured by ultraviolet light irradiation.

4. The method according to claim 1, characterized in that Further including: Providing a substrate, the substrate comprising a first substrate and a second substrate; providing a first barrier layer, wherein the first barrier layer is located between the first substrate and the second substrate, providing a second barrier layer, wherein the second barrier layer is located on a side of the second substrate facing away from the first barrier layer; Providing a backplane circuit structure, the backplane circuit structure comprising a first gate insulation layer, a gate metal layer, a second gate insulation layer, a first source-drain metal layer, an interlayer dielectric layer, and a second source-drain metal layer, the backplane circuit structure constituting a thin film transistor and a capacitor in a gate drive circuit; The second barrier layer, the first gate insulating layer, the second gate insulating layer, and the interlayer dielectric layer in the bending region of the display panel are removed to form a groove, and organic matter is filled into the groove.

5. The method according to claim 1, characterized in that Further including: A protective layer is disposed on a side of the display panel facing the light emitting side, and the protective layer covers at least a portion of the bending area.

6. The method according to claim 1 or 4, characterized in that: Further including: A control chip is arranged on a side of the display panel facing the light emitting side, and the control chip is located in the binding area.

7. A display device, characterized in that: include: A display panel, the display panel comprising a display area and a non-display area, the non-display area comprising a bending area connected to the display area and a binding area connected to the bending area; A back film, the back film is arranged on a side of the display panel away from the light emitting side, the back film comprises a folding area and a cutting area, the display panel in the folding area can be folded toward the side away from the light emitting side, a hollow area is formed on the back film, the hollow area is formed in the cutting area, and the orthographic projection of the hollow area on the display panel is smaller than the orthographic projection of the bending area on the display panel; An adhesive layer, the adhesive layer is disposed between the back film and the display panel, the elastic modulus of the adhesive layer in the folding area is less than the elastic modulus of the adhesive layer in the cutting area, and the adhesive layer in the cutting area meets the following conditions: Before ultraviolet light irradiation, the adhesive force of the adhesive layer is less than 50gf / 25mm; After the ultraviolet light irradiation, the adhesive force of the adhesive layer is greater than 800gf / 25mm.

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