Folding screen, display device and preparation method of folding screen

Abstract

The invention discloses a folding screen, a display device and a manufacturing method of the folding screen, the folding screen comprises a bending area and non-bending areas located on the two sides of the bending area, and the folding screen comprises a flexible screen body and a supporting layer; the flexible screen body is provided with a pre-bending crease, the pre-bending crease is formed in the bending area, the pre-bending crease comprises a crease recess and a crease bulge which are matched with each other, the crease recess is formed on the light emitting surface of the flexible screen body, the crease bulge is formed on the backlight surface of the screen body, and the crease recess has an initial crease depth; the supporting layer is located on the backlight side of the flexible screen body, the portion, located in the bending area, of the supporting layer abuts against a pre-bending crease on the flexible screen body so that the pre-bending crease can be jacked up, after the pre-bending crease is jacked up, a crease pit, formed on the light-emitting face of the flexible screen body, of the pre-bending crease has the assembling crease depth, and the assembling crease depth is smaller than the initial crease depth. According to the scheme, the crease depth of the folding screen can be reduced.

Description

Technical Field

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

[0002] With the development of AMOLED (Active Matrix Organic Light Emitting Diode) technology, OLED (Organic Light Emitting Diode) display screens have changed from hard screen substrates to PI (Polyimide) flexible substrates. OLED display screens using PI flexible substrates are flexible and can be folded and rolled.

[0003] After the OLED display is bent multiple times, creases will appear in the bending area. And as the number of bends increases, the creases will deepen. How to reduce the depth of the creases will directly affect the audience's use, and it is also a problem that major terminal manufacturers and screen manufacturers need to solve urgently. Summary of the invention

[0004] The present application provides a folding screen, a display device and a method for manufacturing a folding screen to reduce the crease depth of the folding screen.

[0005] In order to solve the above technical problems, the technical solution provided by this application is:

[0006] In a first aspect, a folding screen is provided, comprising a bending zone and non-bending zones on both sides of the bending zone, the folding screen comprising a flexible screen body and a supporting layer; a pre-bent fold is formed on the flexible screen body, the pre-bent fold is formed in the bending zone, the pre-bent fold comprises a matching fold depression and a fold protrusion, the fold depression is formed on the light-emitting surface of the flexible screen body, the fold protrusion is formed on the backlight surface of the screen body, the fold depression has an initial fold depth; a supporting layer is located on the backlight side of the flexible screen body, wherein the supporting layer located in the bending zone presses against the pre-bent fold on the flexible screen body to lift up the pre-bent fold, wherein after the pre-bent fold is lifted up, the fold depression formed by the pre-bent fold on the light-emitting surface of the flexible screen body has an assembly fold depth, and the assembly fold depth is less than the initial fold depth.

[0007] In a second aspect, a display device is provided, comprising the above-mentioned folding screen.

[0008] In a third aspect, a method for preparing a folding screen is provided, the method comprising:

[0009] The flexible screen body is pre-bent so that a pre-bent crease is formed at the bend of the flexible screen body; wherein the pre-bent crease includes a matching crease depression and a crease protrusion, the crease depression is formed on the light emitting surface of the flexible screen body, and the crease depression is formed on the backlight surface of the screen body;

[0010] Assemble the support layer to the backlight side of the flexible screen; wherein a portion of the support layer abuts against the pre-bent crease on the flexible screen so that the pre-bent crease is lifted up, wherein after the pre-bent crease is lifted up, the crease depression formed by the pre-bent crease on the light-emitting surface of the flexible screen has an assembly crease depth, and the assembly crease depth is less than the initial crease depth.

[0011] The beneficial effects of this application are:

[0012] The folding screen, display device and method for preparing a folding screen provided in the present application form a pre-bent crease through a flexible screen body, so that the flexible screen body is creased in advance, and then the pre-bent crease is lifted up by a support layer located in the bending area. As long as the crease depth after the pre-bent crease is lifted up, that is, the assembly crease depth is less than the crease depth before the pre-bent crease is lifted up, that is, the initial crease depth, the final crease depth of the folding screen can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0014] Figure 1 It is a schematic diagram of the structure of the flexible screen body of the folding screen after multiple folding in the related art;

[0015] Figure 2 is a structural schematic diagram of an exemplary embodiment of a folding screen provided by the present application;

[0016] Figure 3 It is a schematic diagram of the structure of the flexible screen body in the folding screen of the present application before assembly;

[0017] Figure 4 It is a process flow chart of forming pre-bending creases on the flexible screen;

[0018] Figure 5 This is a schematic diagram of a process in which a pre-bent crease of a flexible screen body is lifted in one embodiment of the present application;

[0019] Figure 6 is a structural schematic diagram of another embodiment of the folding screen provided by the present application;

[0020] Figure 7 is a graph showing the relationship between the number of bends and the depth of the crease in this application;

[0021] Figure 8 It is a schematic diagram of another process in which the pre-bent crease of the flexible screen body is lifted in the present application;

[0022] Fig. 9 yes Figure 2 A schematic diagram of the structure of the support layer in the folding screen;

[0023] Fig.10 is a structural schematic diagram of another embodiment of the folding screen provided by the present application;

[0024] Fig.11 yes Figure 2 Schematic diagram of the formation process of the support layer in the folding screen;

[0025] Fig.12 is a structural schematic diagram of another embodiment of a support layer in a folding screen provided in the present application;

[0026] Fig.13 It is a simplified structural diagram of the flexible screen body and the support layer of the folding screen of the present application in the folded state;

[0027] Fig.14 is a structural schematic diagram of another embodiment of a support layer in a folding screen provided in the present application;

[0028] Fig.15 is a structural schematic diagram of yet another embodiment of the folding screen provided by the present application;

[0029] Fig.16 It is a flow chart of an exemplary embodiment of a method for preparing a folding screen provided in the present application.

[0030] Description of reference numerals:

[0031] Flexible screen body 100'; crease 110'; bent and deformed part 100a'; non-bending part 100b'; folding screen 10; bending area 10a; inner folding area 10a1; reverse folding area 10a2; non-bending area 10b; flexible screen body 100; light-emitting surface 101; backlight surface 102; pre-bent crease 110; crease depression 111; crease protrusion 112; support layer 200; first surface 200a; second surface 200b; through hole 201; groove 202; shading layer 300; screen support assembly 400; middle section 410; side section 420; adhesive backing 500; initial crease depth Dc; assembly crease depth Dz. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the field of folding screens, since the folding screen uses a stacked combination of a flexible screen body, a transparent plastic film layer, an optical adhesive layer, and a thin layer of metal, stress and strain (i.e. deformation) are generated under the action of external force when folded. When the stress does not exceed the elastic limit of the material, the deformation generated is completely eliminated after the external force is removed, and the material returns to its original state. This deformation is a reversible elastic deformation. When the stress exceeds the elastic limit of the material, the deformation generated cannot be completely restored after the external force is removed, and a part of the deformation remains. The material cannot return to its original shape. This residual deformation is an irreversible plastic deformation. Therefore, there is a problem of creases in the bending area.

[0035] See also Figure 1 , Figure 1 A schematic structural diagram of a flexible screen body 100' of a folding screen in the related art after multiple folding is shown. It can be seen that after the folding screen is folded multiple times, the flexible screen body 100' has a bending and deformation part 100a' and a non-bending part 100b'. The flexible screen body 100' is folded and bent at the bending and deformation part 100a', so that after multiple foldings, the bending and deformation part 110' forms a crease 110'. On the light-emitting surface of the flexible screen body 100', the crease 110' is recessed compared to the non-bending part 120', and the recessed depth of the crease 110' is the crease depth D. At present, most folding screens on the market have a crease depth D of about 100 microns or even 150 microns after multiple folding. How to reduce the crease depth D is a problem that needs to be solved urgently.

[0036] In view of this, the present application provides a folding screen, which pre-bends the flexible screen body to form a pre-bend crease at the bend, so that the flexible screen body is creased in advance, and then the support layer lifts up the pre-bend crease when the flexible screen body and the support layer are assembled, so that the crease depth of the flexible screen body in the folding screen can be reduced when the folding screen is folded for use. The following is a specific description of how the present application reduces the crease depth of the flexible screen body through specific embodiments.

[0037] See also Figure 2 , Figure 2 1 is a schematic diagram of the structure of an exemplary embodiment of the folding screen provided by the present application. The folding screen 10 includes a bending area 10a and non-bending areas 10b located on both sides of the bending area 10a. The folding screen 10 can be folded or unfolded along the bending area 10a to achieve the storage of the folding screen 10. The bending area 10a means the area where the folding screen 10 can be bent or deformed during the folding or unfolding process, and the non-bending area 10b means the area where the folding screen 10 can not be bent or deformed during the folding or unfolding process.

[0038] The folding screen 10 includes a flexible screen body 100 and a support layer 200. The flexible screen body 100 refers to a display screen that can be deformed and has a display function. For example, the flexible screen body 100 can be a flexible organic light-emitting semiconductor (OLED) screen. The support layer 200 is used to support the flexible screen body 100 to increase the flatness of the flexible screen body 100. According to the supporting function of the support layer 200, it can be understood that the support layer 200 needs to use a material with greater rigidity, such as metal or other materials with greater rigidity.

[0039] The flexible screen body 100 is formed with a pre-bent crease, which is formed in the bending area 10a. The pre-bent crease refers to a crease formed by bending the flexible screen body 100 in advance before the folding screen 10 leaves the factory. Figure 3 The schematic diagram of the structure of the flexible screen body 100 having the pre-bent crease 110 is shown. Specifically, before the flexible screen body 100 and the support layer 200 are assembled, the flexible screen body 100 can be pre-bent so that the pre-bent crease 110 is formed on the flexible screen body 100. Figure 4 The process flow chart of forming the pre-bending crease 110 on the flexible screen body 100 is shown. Figure 4 (a) shows the flexible screen 100 before the pre-bending process. Figure 4(b) shows the flexible screen body 100 after the pre-bending treatment. It can be seen that the flexible screen body 100 after the pre-bending treatment forms a pre-bending crease 110. The meaning of the pre-bending crease 110 is that the flexible screen body 100 is pre-bent before being assembled with the support layer 200, that is, the flexible screen body 100 is pre-bent, and the crease formed at the bending position of the flexible screen body 100 after the pre-bending treatment is the pre-bending crease 110.

[0040] The pre-bend crease 110 includes a matching crease depression 111 and a crease protrusion 112. The crease depression 111 is formed on the light-emitting surface 101 of the flexible screen body 100, and the crease protrusion 112 is formed on the backlight surface 102 of the screen body. The crease depression 111 has an initial crease depth Dc. The meaning of the initial crease depth Dc refers to the crease depth of the pre-bend crease 110 after the flexible screen body 100 is pre-bent to form the pre-bend crease 110.

[0041] See again Figure 2 The support layer 200 is located on the backlight side of the flexible screen body 100, wherein the support layer 200 located in the bending area 10a abuts against the pre-bent crease 110 on the flexible screen body 100, so that the pre-bent crease 110 is lifted up, wherein after the pre-bent crease 110 is lifted up, the crease depression 111 formed by the pre-bent crease 110 on the light-emitting surface 101 of the flexible screen body 100 has an assembly crease depth, Figure 5 FIG. 1 is a schematic diagram showing a process in which the pre-bent fold 110 of the flexible screen 100 is lifted up according to an embodiment of the present invention. Figure 5 (a) shows a schematic diagram of the structure of the flexible screen body 100 before the pre-bent fold 110 is lifted up. Figure 5 (b) shows a schematic diagram of the structure after the pre-bent crease 110 of the flexible screen 100 is lifted. The assembly crease depth is less than the initial crease depth Dc. The assembly crease depth can be zero or a value greater than zero. Please refer to Figure 6 , Figure 6 is a structural schematic diagram of another embodiment of the folding screen provided by the present application, Figure 6 Shows the case where the assembly crease depth is greater than zero ( Figure 6 Dz represents the assembly crease depth), Figure 2 The case where the assembly crease depth is zero is shown.

[0042] It can be seen that the present application forms a pre-bent crease 110 through the flexible screen body 100, so that the flexible screen body 100 is creased in advance, and then the pre-bent crease 110 is lifted up through the support layer 200 located in the bending area 10a. As long as the crease depth after the pre-bent crease 110 is lifted up, that is, the assembly crease depth is less than the crease depth before the pre-bent crease 110 is lifted up, that is, the initial crease depth Dc, the final crease depth of the folding screen 10 can be reduced. The principle of how the present application can reduce the final crease depth of the folding screen 10 is specifically analyzed below.

[0043] When the flexible screen body 100 is not pre-bent, the structure of the folding screen 10 is obtained by directly assembling the non-pre-bent flexible screen body 100 and the support layer 200. During the folding and use of the folding screen 10, due to the multiple folding and unfolding of the folding screen 10, the flexible screen body 100 will gradually produce creases. However, during the full life cycle of the flexible screen body 100, the early folding has a relatively large impact on the depth of the creases finally produced by the flexible screen body 100. For example, the folding number of times the folding screen 10 is folded during its product life cycle is about 200,000 to 500,000 times, and the crease depth will eventually be about 150 microns. However, of this 150 micron crease depth, about 70-80 microns are produced during the first 10,000 folds. This is because it takes time for the polymer material in the flexible screen body 100 to recover after a large deformation, especially the OCA glue in the flexible screen body 100 recovers very slowly. The OCA (Optically Clear Adhesive) glue in the flexible screen body 100 will move to both sides of the bending area 10a of the folding screen 10 when bending, and then slowly flow to the bending area 10a after being flattened. The deformation recovery time of this part is relatively long, and it is even accompanied by creep (creep of materials, that is, the tendency to slowly and permanently deform under stress), which is irreversible. After the early bending deformation of the flexible screen body 100, the irreversible accumulation is very large, and the accumulation of residual deformation becomes smaller and smaller in the later stage. In addition, after the large deformation of the polymer material, the molecules will have a certain orientation, and deformation will be more difficult. Therefore, the influence of the early bending times on the final crease depth of the folding screen 10 is more significant.

[0044] The present application is based on this principle, and thus the flexible screen body 100 is pre-bent before assembly, so that the flexible screen body 100 generates creases in advance, and the deformation with a long recovery time or even creep is produced. After the flexible screen body 100 and the support layer 200 are assembled to form the folding screen 10, when the folding screen 10 product is folded for use, the depth of the crease generated by the flexible screen body 100 is the depth of the crease generated when the flexible screen body 100 is folded later, which is much smaller than the depth of the crease generated by the folding of the flexible screen body 100 during its entire life cycle. Therefore, as long as the pre-bent crease 110 is lifted to a certain height by the support layer 200 located in the bending zone 10a when the flexible screen body 100 is assembled, the crease depth during the use of the folding screen 10 product can be achieved to be smaller than the crease depth of the flexible screen body 100 that is assembled without pre-bending treatment.

[0045] Further, see again Figure 2In this embodiment, the depth of the assembly crease is zero. In this embodiment, after the pre-bent crease 110 is lifted up by the support layer 200 located in the bending area 10a, the light-emitting surface 101 of the flexible screen body 100 of the assembled folding screen 10 is a flat surface without depressions, which does not affect the appearance of the flexible screen body 100 of the assembled folding screen 10 product. It can be understood that in other embodiments, such as Figure 6 As shown, the assembly crease depth can also be a value greater than zero, but in this case, the folding screen 10 product obtained by assembling the flexible screen body 100 and the supporting layer 200 still has a certain depression on the light-emitting surface 101 of the flexible screen body 100. Although it does not affect the effect of reducing the final crease depth of the folding screen 10, it will affect the appearance of the folding screen 10 product to a certain extent.

[0046] Further, the initial crease depth Dc is less than or equal to 100 micrometers. Preferably, the initial crease depth Dc may be 70 to 100 micrometers. Exemplarily, the initial crease depth Dc may be 70 micrometers, 75 micrometers, 80 micrometers, 85 micrometers, 90 micrometers, 95 micrometers or 100 micrometers.

[0047] To achieve the above-mentioned initial crease depth Dc, the number of pre-bending processes of the flexible screen 100 is less than or equal to N, wherein N is an integer ranging from 8000 to 12000, for example, 8000 times, 9000 times, 10000 times, 11000 times or 12000 times. Figure 7 A graph showing the relationship between the number of bends and the crease depth shows that when the bends are 2000 times, the crease depth is approximately 30-32 microns; when the bends are 5000 times, the crease depth is approximately 60-62 microns; when the bends are 7500 times, the crease depth is approximately 65-66 microns; when the bends are 10000 times, the crease depth is approximately 75-76 microns.

[0048] For further information, see Figure 8 , Figure 8It is another schematic diagram of the process in which the pre-bend crease of the flexible screen body in the present application is lifted up. In this embodiment, before the pre-bend crease 110 is lifted up, the pre-bend crease 110 further extends to the non-bending area 10b. After the pre-bend crease 110 is lifted up, the pre-bend crease 110 is located in the bending area 10a. In this embodiment, the pre-bend crease 110 formed after the flexible screen body 100 is pre-bent is further widened, so that the width of the pre-bend crease 110 can be greater than the width of the support layer 200 in the bending area 10a, thereby preventing the flexible screen body 100 from being pushed up by the support layer 200 outside the pre-bend crease 110 area. That is, when the flexible screen body 100 is pre-bent, its pre-bend radius is greater than the bending radius of the folding screen 10. In other embodiments, the width of the pre-bend crease 110 is at most equal to the width of the support layer 200 located in the bending zone 10a. This requires that the pre-bend crease 110 and the support layer 200 located in the bending zone 10a be precisely assembled to avoid the flexible screen 100 being pushed against by the support layer 200 outside the pre-bend crease 110 area.

[0049] For further information, see Fig. 9 , Fig. 9 yes Figure 2 Schematic diagram of the structure of the support layer 200 in the folding screen 10. In this embodiment, since the support layer 200 needs to be folded in the bending area 10a, and the stiffness of the support layer 200 is relatively large, in order to realize the folding function of the support layer 200 in the bending area 10a, the elastic modulus of the support layer 200 in the bending area 10a can be reduced to facilitate folding. When the support layer 200 is made of metal material, for example, the support layer 200 is a steel sheet, the support layer 200 may be provided with a plurality of through holes 201 spaced apart in the bending zone 10a. By punching the support layer 200 in the bending zone 10a, the folding of the support layer 200 in the bending zone 10a can be facilitated. The aperture of the through hole 201 and the spacing between adjacent through holes 201 are based on the folding of the support layer 200 in the bending zone 10a. For example, the aperture of the through hole 201 may be 0.1 to 0.2 mm (for example, the aperture of the through hole 201 may be 0.1 mm, 0.15 mm or 0.2 mm, etc.), and the spacing between adjacent through holes 201 may be 0.1 to 0.2 mm (for example, the spacing between adjacent through holes 201 may be 0.1 mm, 0.15 mm or 0.2 mm, etc.). The through hole 201 on the support layer 200 can be processed by mechanical punching, laser punching, or etching to form the through hole 201. It can be understood that in other embodiments, the support layer 200 can be made of a material with lower rigidity in the bending area 10a and a material with higher rigidity in the non-bending area 10b, which can also achieve the performance of the support layer 200 being easy to fold in the bending area 10a.

[0050] Based on the above examples, please refer to Fig.10 , Fig.10 It is a structural schematic diagram of another embodiment of the folding screen 10 provided in the present application. In this embodiment, the folding screen 10 further includes a light shielding layer 300, which is located on the side of the supporting layer 200 away from the flexible screen body 100, wherein the orthographic projection of the light shielding layer 300 on the flexible screen body 100 covers a plurality of through holes 201. In this embodiment, since the supporting layer 200 located in the bending area 10a is provided with through holes 201, and the through holes 201 will leak light, in order to prevent the light emitted by the flexible screen body 100 from leaking at the through holes 201 of the supporting layer 200, the light shielding layer 300 is provided to shield the through holes 201 of the supporting layer 200. The light shielding layer 300 may be a light shielding tape.

[0051] Further, see again Fig. 9 In this embodiment, the thickness of the support layer 200 located in the bending area 10a is greater than the thickness of the support layer 200 located in the non-bending area 10b. The support layer 200 of this embodiment forms a structure that is thick in the middle and thin on both sides. Since the thickness of the support layer 200 located in the bending area 10a is relatively large, when the support layer 200 is bent, the deformation amplitude of the support layer 200 at the bending area 10a is reduced, and the part of the flexible screen 100 in the bending area 10a can be better supported, and the crease depth of the flexible screen 100 located in the bending area 10a is further reduced. The thick middle and thin sides of the support layer 200 of this embodiment can be achieved by an etching process. Specifically, the surface of the support layer 200 can be covered with a resist, and the thickness of the resist in the thick middle part of the support layer 200 is thinner, and the thickness of the resist in the thin sides of the support layer 200 is thicker, so that the support layer 200 can be formed to be thick in the middle and thin on both sides. It is understandable that in other embodiments, the support layer 200 may be formed to be thick in the middle and thin at both sides by mechanical processing.

[0052] Fig.11 Schematic diagram showing the formation process of the support layer 200, Fig.11 (a) shows the original state of the support layer 200. Fig.11 (b) shows that the support layer 200 forms a structure that is thick in the middle and thin on both sides. Fig.11 (c) shows that the support layer 200 located in the bending area 10a is further formed into a structure with a plurality of through holes 201.

[0053] For the above-mentioned support layer 200 located in the bending area 10a having a thickness greater than that located in the non-bending area 10b, please refer to Figure 2 , Fig. 9 and Fig.12 , Fig.12 is a structural schematic diagram of another embodiment of the support layer in the folding screen provided by the present application, Figure 2 and Fig. 9A first form of the support layer 200 is shown, Fig.12 The second form of the support layer 200 is shown. The surface of the support layer 200 facing away from the flexible screen 100 is defined as the first surface 200a, and the surface of the support layer 200 facing the flexible screen 100 is defined as the second surface 200b. The first surface 200a located in the bending area 10a protrudes from the first surface 200a located in the non-bending area 10b. Figure 2 and Fig. 9 In the first form of the support layer 200 shown, the second surface 200b located in the bending area 10a protrudes from the second surface 200b located in the non-bending area 10b. Fig.12 In the second form of the supporting layer 200 shown, the second surface 200b located in the bending area 10a is flush with the second surface 200b located in the non-bending area 10b.

[0054] Understandably, Figure 2 and Fig. 9 In the first form shown, the second surface 200b located in the bending area 10a protrudes from the second surface 200b located in the non-bending area 10b, which can make the crease depression 111 easier to be lifted up. The specific height value of the second surface 200b located in the bending area 10a protruding from the second surface 200b located in the non-bending area 10b can be based on the value required for the assembly crease depth of the crease depression 111 after the crease depression 111 is lifted up. For example, when the assembly crease depth is required to be zero, The specific height value of the second surface 200b located in the bending area 10a protruding from the second surface 200b located in the non-bending area 10b can be the initial crease depth Dc of the crease recess 111. In this way, after the flexible screen body 100 and the supporting layer 200 are assembled, the supporting layer 200 located in the bending area 10a lifts up the pre-bent crease 110 on the flexible screen body 100, so that the assembly crease depth of the crease recess 111 is zero, that is, the light-emitting surface 101 of the flexible screen body 100 is a flat surface.

[0055] It should be noted that Figure 2 and Fig. 9 In the first form of the support layer 200 shown, the second surface 200b located in the bending area 10a protrudes from the second surface 200b located in the non-bending area 10b. In this form, the thickened area of ​​the support layer 200 can extend to the entire bending area 10a, or only to a part of the bending area 10a instead of completely extending to the entire bending area 10a. Preferably, the thickened area of ​​the support layer 200 extends to the entire bending area 10a, so as to lift up the entire area where the fold depression 111 of the flexible screen 100 is located as much as possible.

[0056] The thickness of the support layer 200 located in the bending zone 10a can be 120 to 150 microns (for example, the thickness of the support layer 200 located in the bending zone 10a can be 120 microns, 130 microns, 140 microns or 150 microns, etc.), and the thickness of the support layer 200 in the non-bending zone 10b can be 50 to 100 microns (for example, the thickness of the support layer 200 in the non-bending zone 10b can be 50 microns, 60 microns, 70 microns, 80 microns, 90 microns or 100 microns, etc.).

[0057] For further information, see Fig.13 , Fig.13 A simple structural schematic diagram of the flexible screen body 100 and the support layer 200 of the folding screen 10 of the present application in the folded state is shown. It can be seen that the bending area 10a of the folding screen 10 includes an inner folding area 10a1 and a reverse folding area 10a2. The center of the inner folding area 10a1 is located on the inner side of the folding screen 10 after folding, and the center of the reverse folding area 10a2 is located on the outer side of the folding screen 10 after folding. That is, the bending directions of the inner folding area 10a1 and the reverse folding area 10a2 are opposite, which is conducive to the flexible screen body 100 in the non-bending area 10b on both sides of the bending area 10a after the folding screen 10 is folded to be parallel to each other and have a smaller spacing d. Fig.13 Here, R1 represents the bending radius of the inner folding area 10a1, and R2 represents the bending radius of the reverse folding area 10a2.

[0058] Please also read Fig.14 , Fig.14 It is a structural schematic diagram of another embodiment of the support layer in the folding screen provided in the present application. In this embodiment, the through hole 201 is located in the inner folding area 10a1. To facilitate the bending of the support layer 200 located in the inflection area 10a2, a plurality of spaced grooves 202 are provided on the first surface 200a of the support layer 200 located in the inflection area 10a2. The groove width of the groove 202 and the spacing between adjacent grooves 202 can refer to the aperture of the through hole 201 and the spacing between adjacent through holes 201. The specific values ​​of the groove width of the groove 202 and the spacing between adjacent grooves 202 are based on the easy folding of the support layer 200 in the inflection area 10a2.

[0059] The support layer 200 is preferably an integral structure that cannot be disassembled, and is further preferably an integrally molded structure to increase the strength of the support layer 200 .

[0060] Based on the above examples, please refer to Fig.15 , Fig.15It is a structural schematic diagram of another embodiment of the folding screen 10 provided in the present application. The folding screen 10 of this embodiment also includes a screen support component 400. The screen support component 400 is located on the side of the support layer 200 away from the flexible screen body 100. The folding screen 10 of this embodiment includes a flexible screen body 100, a support layer 200 and a screen support component 400. The screen support component 400 is used to provide a folding axis for the folding screen 10, so that the folding screen 10 can be folded and unfolded along a specific position, namely the bending area 10a. The screen support component 400 can be a hinge, for example, it can be a water drop-shaped hinge.

[0061] Specifically, the screen support assembly 400 includes a middle section 410 and side sections 420 movably connected to both sides of the middle section 410. The support layer 200 located in the bending area 10a is arranged corresponding to the middle section 410. The support layer 200 located in the non-bending area 10b on both sides of the bending area 10a abuts against the side sections 420 on both sides of the middle section 410, respectively, so as to drive the support layer 200 to fold in the bending area 10a. A backing adhesive 500 is also arranged between the screen support assembly 400 and the support layer 200. Specifically, the side sections 420 of the screen support assembly 400 and the support layer 200 located in the non-bending area 10b are provided with backing adhesive 500, so as to fix the side sections 420 of the screen support assembly 400 and the support layer 200 located in the non-bending area 10b through the backing adhesive 500.

[0062] Further, the support layer 200 located in the bending area 10a abuts against the middle section 410. Specifically, the first surface 200a of the support layer 200 located in the bending area 10a is arc-shaped, and the center of the middle section 410 abuts against the center of the support layer 200 located in the bending area 10a, so that the screen support assembly 400 supports the flexible screen body 100 and the support layer 200 located in the bending area 10a, and further reduces the depression of the flexible screen body 100 located in the bending area 10a after bending.

[0063] The present application also provides a display device, which includes a folding screen 10. The specific structure of the folding screen 10 refers to the above embodiment. Since the present display device adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here. The display device can be a mobile phone or a laptop computer.

[0064] This application also provides a method for preparing a folding screen, please refer to Fig.16 , Fig.16 : is a flow chart of an exemplary embodiment of a method for preparing a folding screen provided in the present application. Specifically, the preparation method may include the following steps:

[0065] Step S10: pre-bend the flexible screen so that a pre-bend crease is formed at the bend of the flexible screen; wherein the pre-bend crease includes a matching crease depression and a crease protrusion, the crease depression is formed on the light emitting surface of the flexible screen, and the crease depression is formed on the backlight surface of the screen.

[0066] See also Figure 3 and Figure 4 , Figure 3 The structure of the flexible screen body 100 after pre-bending is shown. Figure 4 The figure shows the process of pre-bending the flexible screen 100. After the pre-bending process, the flexible screen 100 forms a pre-bending crease 110, which includes a matching crease depression 111 and a crease protrusion 112. The crease depression 111 is formed on the light-emitting surface 101 of the flexible screen 100, and the crease protrusion 112 is formed on the backlight surface 102 of the screen. The crease depression 111 has an initial crease depth Dc.

[0067] Step S20: Assemble the supporting layer to the backlight side of the flexible screen, wherein part of the supporting layer presses against the pre-bent crease on the flexible screen to lift up the pre-bent crease 110; wherein after the pre-bent crease is lifted up, a crease depression formed by the pre-bent crease on the light-emitting surface of the flexible screen has an assembly crease depth, and the assembly crease depth is less than the initial crease depth.

[0068] See again Figure 2 and Fig. 9 , Fig. 9 2 shows a schematic structural diagram of the support layer 200. Figure 2 The schematic diagram of the structure after the support layer 200 is assembled to the backlight side of the flexible screen 100 is shown. The support layer 200 partially abuts against the pre-bent crease 110 on the flexible screen 100, so that the pre-bent crease 110 is lifted up, wherein after the pre-bent crease 110 is lifted up, the crease depression 111 formed by the pre-bent crease 110 on the light-emitting surface 101 of the flexible screen 100 has an assembly crease depth, the assembly crease depth is less than the initial crease depth, and the assembly crease depth can be zero or a value greater than zero.

[0069] The preparation method of the folding screen provided in the present application pre-bends the flexible screen body 100 before assembling the flexible screen body 100 and the support layer 200, so that the flexible screen body 100 forms a pre-bent crease 110, that is, the flexible screen body 100 is creased in advance, and then the pre-bent crease 110 is lifted up by the support layer 200. As long as the crease depth of the pre-bent crease 110 after being lifted up, that is, the assembly crease depth is less than the crease depth before the pre-bent crease 110 is lifted up, that is, the initial crease depth, the final crease depth of the folding screen 10 can be reduced.

[0070] Furthermore, the method for preparing the folding screen of this embodiment further includes:

[0071] Step S30: Assemble the screen support assembly on the side of the support layer facing away from the flexible screen body, so that the middle section of the screen support assembly corresponds to the support layer located in the bending area, and the side sections on both sides of the middle section respectively abut against the support layer in the non-bending areas on both sides of the bending area, so as to drive the support layer to fold in the bending area.

[0072] See also Fig.15 The screen support assembly 400 is assembled on the side of the support layer 200 away from the flexible screen body 100. The screen support assembly 400 includes a middle section 410 and side sections 420 movably connected to both sides of the middle section 410. The support layer 200 located in the bending area 10a is arranged correspondingly to the middle section 410. The support layer 200 located in the non-bending area 10b on both sides of the bending area 10a abuts against the side sections 420 on both sides of the middle section 410, so as to drive the support layer 200 to fold in the bending area 10a. Further, the support layer 200 located in the bending area 10a abuts against the middle section 410. Specifically, the first surface 200a of the support layer 200 located in the bending zone 10a is arc-shaped, and the center of the middle section 410 abuts against the center of the support layer 200 located in the bending zone 10a, so that the screen support assembly 400 supports the flexible screen body 100 and the support layer 200 located in the bending zone 10a, further reducing the depression of the flexible screen body 100 located in the bending zone 10a after bending.

[0073] The above-mentioned step S30 can be performed after step S20 or before step S20, that is, the screen support assembly 400 can be assembled after the flexible screen body 100 and the support layer 200 are assembled, or the support layer 200 and the screen support assembly 400 are assembled before being assembled with the flexible screen body 100. However, no matter which assembly order is used, the flexible screen body 100 needs to be pre-bent before its assembly.

[0074] On the basis of the above embodiment, in step S10, the number of bends in the pre-bending process is less than or equal to N; wherein N is an integer ranging from 8000 to 12000. For example, it can be 8000 times, 9000 times, 10000 times, 11000 times or 12000 times. During the pre-bending process, after N bends, the initial crease depth Dc of the pre-bending crease 110 of the flexible screen body 100 is less than or equal to 100 microns. Preferably, the initial crease depth Dc can be 70 to 100 microns. Exemplarily, the initial crease depth Dc can be 70 microns, 75 microns, 80 microns, 85 microns, 90 microns, 95 microns or 100 microns.

[0075] The terms "first", "second", "third" in this application are only used for descriptive purposes and cannot be understood as indicating the quantity of the indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. The process, method, system, product or equipment such as including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0076] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A folding screen, characterized in that: The folding screen includes a bending area and non-bending areas located on both sides of the bending area, and the folding screen includes: A flexible screen body, wherein the flexible screen body is formed with a pre-bent crease, wherein the pre-bent crease is formed in the bending area, wherein the pre-bent crease comprises a matching crease depression and a crease protrusion, wherein the crease depression is formed on a light-emitting surface of the flexible screen body, wherein the crease protrusion is formed on a backlight surface of the screen body, and wherein the crease depression has an initial crease depth; A support layer is located on the backlight side of the flexible screen, wherein the support layer located in the bending area presses against the pre-bent crease on the flexible screen to lift up the pre-bent crease, wherein after the pre-bent crease is lifted up, the crease depression formed by the pre-bent crease on the light-emitting surface of the flexible screen has an assembly crease depth, and the assembly crease depth is less than the initial crease depth.

2. The folding screen according to claim 1, characterized in that: The assembly crease depth is zero.

3. The folding screen according to claim 1, characterized in that: The initial crease depth is less than or equal to 100 microns; Preferably, the initial crease depth is 70 to 100 microns.

4. The folding screen according to claim 1, characterized in that: Before the pre-bending crease is lifted up, the pre-bending crease further extends into the non-bending zone, and after the pre-bending crease is lifted up, the pre-bending crease is located in the bending zone.

5. The folding screen according to claim 1, characterized in that: The folding screen further comprises a screen support component, which is located on a side of the support layer away from the flexible screen body, and comprises a middle section and side sections movably connected to both sides of the middle section, the support layer located in the bending area is arranged corresponding to the middle section, and the support layer in the non-bending area on both sides of the bending area is respectively abutted against the side sections on both sides of the middle section, so as to drive the support layer to fold in the bending area; Preferably, the middle section abuts against the support layer located in the bending area.

6. The folding screen according to claim 1, characterized in that: The support layer is provided with a plurality of through holes distributed at intervals in the bending area; Preferably, the through hole has a diameter of 0.1 to 0.2 mm; Preferably, the spacing between adjacent through holes is 0.1 to 0.2 mm; Preferably, the folding screen further comprises a light-shielding layer, which is located on a side of the supporting layer away from the flexible screen body, wherein an orthographic projection of the light-shielding layer on the flexible screen body covers a plurality of the through holes.

7. The folding screen according to claim 1 or 6, characterized in that: The thickness of the support layer located in the bending area is greater than the thickness of the support layer located in the non-bending area; Preferably, a surface of the support layer facing away from the flexible screen body is defined as a first surface, and a surface of the support layer facing the flexible screen body is defined as a second surface, wherein the first surface located in the bending area protrudes beyond the first surface located in the non-bending area, and, The second surface located in the bending area protrudes from the second surface located in the non-bending area, or the second surface located in the bending area is flush with the second surface located in the non-bending area; Preferably, the thickness of the support layer in the bending area is 120-150 microns, and the thickness of the support layer in the non-bending area is 50-100 microns; Preferably, the supporting layer is a non-detachable integral structure.

8. A display device, characterized in that: Comprising a folding screen as described in any one of claims 1-7.

9. A method for preparing a folding screen, characterized in that: The method comprises: The flexible screen body is pre-bent so that a pre-bent crease is formed at the bend of the flexible screen body; wherein the pre-bent crease includes a matching crease depression and a crease protrusion, the crease depression is formed on the light emitting surface of the flexible screen body, and the crease depression is formed on the backlight surface of the screen body; Assemble the support layer to the backlight side of the flexible screen; wherein a portion of the support layer abuts against the pre-bent crease on the flexible screen so that the pre-bent crease is lifted up, wherein after the pre-bent crease is lifted up, the crease depression formed by the pre-bent crease on the light-emitting surface of the flexible screen has an assembly crease depth, and the assembly crease depth is less than the initial crease depth.

10. The method for preparing a folding screen according to claim 9, characterized in that: In the step of pre-bending the flexible screen so that a pre-bending crease is formed at the bending position of the flexible screen, the number of bends in the pre-bending process is less than or equal to N, wherein N is an integer ranging from 8000 to 12000; Preferably, the method further comprises: The screen support assembly is assembled on the side of the support layer facing away from the flexible screen body, so that the middle section of the screen support assembly corresponds to the support layer located in the bending area, and the side sections on both sides of the middle section are respectively abutted against the support layer in the non-bending areas on both sides of the bending area, so as to drive the support layer to fold in the bending area.

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