Folding cover plate, folding display panel and folding display device

Abstract

The invention provides a folding cover plate, a folding display panel and a folding display device.The folding cover plate comprises a first protective layer, ultra-thin glass and a second protective layer which are arranged in a stacked mode; the folding cover plate further comprises a third protection layer which is arranged on the same layer as the ultra-thin glass and surrounds the ultra-thin glass. And a folding reserved space is arranged between the third protective layer and the edge of the ultra-thin glass. Seen from the top, according to the folding cover plate, the second protection layer and the first protection layer are arranged on the upper surface and the lower surface of the ultra-thin glass respectively, the third protection layer is arranged on the side surface, the ultra-thin glass is wrapped in the cover plate, and the ultra-thin glass is protected. The ultra-thin glass is prevented from being damaged in the assembling process, and the yield of the folding cover plate, the folding display panel and the folding limiting device is increased. And the folding reserved space is arranged, so that the ultrathin glass is prevented from being damaged due to stress concentration, and the film layer can be prevented from being stripped due to the fact that the film layer is pushed by the ultrathin glass.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a folding cover, a folding display panel and a folding display device. Background Art

[0002] The cover plate of the foldable display device is usually made of CPI (transparent polyimide) or PET (polyethylene terephthalate). With the development of technology, in order to improve the strength of the cover plate, UTG (ultra-thin glass) is used to replace CPI and PET to prepare the cover plate of the foldable display device.

[0003] Compared with CPI and PET, UTG has obvious advantages in scratch resistance, crease improvement, strength (ball and pen drop performance), touch, etc., but UTG is made of glass and is relatively thin, so there is a risk of damage during assembly. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a foldable cover, a foldable display panel and a foldable display device.

[0005] Based on the above purpose, the present application provides a folding cover, including:

[0006] A first protective layer, an ultra-thin glass, and a second protective layer are stacked;

[0007] The folding cover also includes: a third protective layer which is in the same layer as the ultra-thin glass and is arranged around the ultra-thin glass; and a folding reserved space is arranged between the third protective layer and the edge of the ultra-thin glass.

[0008] Furthermore, the third protective layer includes a first part and a second part, the first part is arranged along the folding direction of the folding cover, and the second part is arranged along the folding direction perpendicular to the folding cover; a folding reserved space is arranged between the first part and the edge of the ultra-thin glass.

[0009] Furthermore, the size of the folding reserved space is determined according to the folding radius of the folding cover.

[0010] Furthermore, the third protective layer is made of flexible material.

[0011] Furthermore, the material of the first part is a flexible material, and the material of the second part is optical glue.

[0012] Furthermore, the first protective layer includes a first flexible material layer and a first optical adhesive layer located between the first flexible material layer and the ultra-thin glass.

[0013] Furthermore, the second protective layer includes a second flexible material layer and a second optical adhesive layer located between the second flexible material layer and the ultra-thin glass.

[0014] Furthermore, the second protective layer also includes an ink layer disposed between the second flexible material layer and the second optical adhesive layer.

[0015] Furthermore, the projection of the ink layer on the ultra-thin glass at least partially overlaps with the ultra-thin glass.

[0016] Furthermore, it also includes an impact-resistant layer arranged on the second protective layer.

[0017] Furthermore, it also includes an anti-glare layer arranged on the second protective layer.

[0018] The present application also provides a folding display panel, comprising the above-mentioned folding cover plate.

[0019] The present application also provides a folding display device, comprising the above-mentioned folding display panel.

[0020] From the above, it can be seen that the folding cover plate, folding display panel and folding display device provided by the present application, by respectively setting a second protective layer and a first protective layer on the upper and lower sides of the ultra-thin glass, and setting a third protective layer on the side, the ultra-thin glass is wrapped inside the cover plate to protect the ultra-thin glass. It prevents the ultra-thin glass from being damaged during the assembly process, and improves the yield rate of the folding cover plate, the folding display panel and the folding limiting device. It also prevents the ultra-thin glass from being damaged due to stress concentration by setting a folding reserved space, and can prevent the film layer from peeling off due to the ultra-thin glass pushing the film layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution in the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the top structure of the folding cover plate of an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the front cross-sectional structure of the folding cover plate of an embodiment of the present application.

[0024] Figure 3 This is a schematic diagram of the top cross-sectional structure of the folding cover plate of the first embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of the top cross-sectional structure of the folding cover plate of the second embodiment of the present application.

[0026] Figure 5 It is a schematic side sectional structure diagram of the folding cover plate of the second embodiment of the present application.

[0027] The reference numerals in the figure include: ultra-thin glass 1, third protective layer 2, folding reserved space 3, first flexible material layer 4, first optical adhesive layer 5, second flexible material layer 6, second optical adhesive layer 7, ink layer 8, first part 201, and second part 202. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field to which the present application belongs. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0030] With the growing development of the display industry, folding display products are increasingly favored by various terminal brands and consumers, and folding display products are emerging in an endless stream. With the continuous development of the industry, customers' requirements for folding display products are also increasing, and the problem of on-screen strength is what needs to be urgently solved in folding display products. In order to enhance the on-screen strength of folding display products, scientific and technological personnel have developed a folding cover made of UTG material (ultra-thin glass). Compared with traditional folding cover materials such as CPI and PET, UTG has obvious advantages in scratch resistance, crease improvement, strength (ball and pen drop performance), and touch. However, UTG itself is made of glass, and because it is thin, there is a risk of easy damage during assembly.

[0031] Under normal circumstances, the cover laminating factory will require the ultra-thin glass factory to ship the ultra-thin glass in boxes of certain sizes. The shipped ultra-thin glass will be laminated after arriving at the cover laminating factory. During the laminating process, there will inevitably be appearance problems caused by the process. When the cover laminating factory ships to the display panel assembly factory, the folding cover with appearance problems will cause secondary damage during the assembly process of the display panel assembly factory, which will seriously affect the folding performance of the display panel.

[0032] In response to the risk of ultra-thin glass assembly being fragile, the relevant technical solution is to control it through appearance limit samples, but this method cannot effectively intercept some ultra-thin glass with poor appearance. After this ultra-thin glass with poor appearance flows out, it will affect the folding performance of the folding display panel.

[0033] In view of the disadvantage that the ultra-thin glass in the related art is easily damaged during the assembly process, the embodiments of the present application provide a folding cover, a folding display panel and a folding display device.

[0034] The folding cover plate, folding display panel and folding display device provided by the present application respectively provide a second protective layer and a first protective layer on the upper and lower surfaces of the ultra-thin glass, and provide a third protective layer on the side, so as to wrap the ultra-thin glass inside the cover plate to protect the ultra-thin glass. This prevents the ultra-thin glass from being damaged during the assembly process, and improves the yield rate of the folding cover plate, the folding display panel and the folding limiting device. In addition, by providing a folding reserved space, the ultra-thin glass is prevented from being damaged due to stress concentration, and the film layer can be prevented from peeling off due to the ultra-thin glass pushing the film layer.

[0035] Figure 1 The top view structure of the folding cover plate of the embodiment of the present application is shown.

[0036] refer to Figure 1 The folding track of the folding cover on the left is up and down folding, and the folding track of the folding cover on the right is left and right folding (relative to the placement of the folding cover in the figure). The cross-sectional view obtained by cutting along AA in the figure is Figure 2 .

[0037] Figure 2 The front cross-sectional structure of the folding cover according to the embodiment of the present application is shown.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a folding cover, comprising:

[0039] The first protective layer, the ultra-thin glass 1 and the second protective layer are stacked.

[0040] In this embodiment, the second protective layer and the first protective layer are respectively arranged on the upper and lower surfaces of the ultra-thin glass 1 to protect the upper and lower surfaces of the ultra-thin glass 1 and prevent the upper and lower surfaces of the ultra-thin glass 1 from being damaged by force.

[0041] The thickness of the ultra-thin glass 1 affects the bending performance and strength of the ultra-thin glass 1. When the thickness of the ultra-thin glass 1 decreases, the bending performance of the ultra-thin glass 1 will be improved, but at the same time the strength will decrease. However, because the embodiment of the present application protects the ultra-thin glass 1 through a protective layer, the effect of the thickness of the ultra-thin glass 1 on the strength can be partially ignored, and the bending performance of the ultra-thin glass 1 can be improved by reducing the thickness of the ultra-thin glass 1. In some embodiments, the folding cover is used for easy-to-carry terminal devices such as mobile phones. At this time, the thickness of the ultra-thin glass 1 can be 20μm-150μm. In other embodiments, the folding cover is used for larger terminal devices such as tablet computers. Because the size of these devices is large, the size of the folding cover is also large. If the thickness of the ultra-thin glass 1 is too small, the strength of the folding cover will be greatly reduced. If the thickness of the ultra-thin glass 1 is too large, the bending performance of the folding cover will be greatly reduced. Therefore, the thickness of the ultra-thin glass 1 needs to be moderate, which can be 30μm-80μm. For example, considering the strength and bending performance of the ultra-thin glass 1 comprehensively, the thickness of the ultra-thin glass 1 can be 30 μm. At this time, the ultra-thin glass 1 has good bending performance and can be protected from damage under the protection of the protective layer.

[0042] The folding cover also includes: a third protective layer 2 which is in the same layer as the ultra-thin glass 1 and is arranged around the ultra-thin glass 1 .

[0043] In this embodiment, the third protective layer 2 is disposed on the side of the ultra-thin glass 1 to protect the side of the ultra-thin glass 1 and prevent the side of the ultra-thin glass 1 from being damaged by force.

[0044] In this way, by arranging the first protective layer, the second protective layer and the third protective layer 2 around the ultra-thin glass 1, the ultra-thin glass 1 is protected inside the protective layer, and external force is prevented from directly acting on the ultra-thin glass 1 to cause damage to the ultra-thin glass 1. In this way, the ultra-thin glass 1 is prevented from being damaged during the assembly process, thereby improving the yield rate of the folding cover, saving costs, and ensuring the folding performance of the folding cover, and increasing the number of bending times of the folding cover.

[0045] Considering that when the folding cover is folded, the ultra-thin glass 1 will bend, and the ultra-thin glass 1 will deform during the bending process. If the ultra-thin glass 1 abuts against the third protective layer 2 when deformed, stress concentration will occur, which may damage the ultra-thin glass 1. Therefore, it is necessary to avoid the ultra-thin glass 1 abutting against the third protective layer 2 during the bending process.

[0046] A folding reserved space 3 is provided between the third protective layer 2 and the edge of the ultra-thin glass 1 .

[0047] In this way, by setting the folding reserved space 3, the ultra-thin glass 1 is prevented from abutting against the third protective layer 2 during the bending process, thereby preventing the ultra-thin glass 1 from generating stress concentration when the folding cover is folded, thereby preventing the ultra-thin glass 1 from being damaged due to stress concentration, and preventing the film layer from peeling off due to the ultra-thin glass 1 pushing the film layer.

[0048] In some embodiments, the third protective layer 2 is an integrated structure, and the third protective layer 2 is obtained by opening a through hole in the plate, wherein the size of the through hole is the total size of the ultra-thin glass 1 and the folding reserved space 3 .

[0049] In other embodiments, for the convenience of preparation, the third protective layer 2 is a spliced ​​structure. For example, the third protective layer 2 can be spliced ​​by four trapezoidal structures, or can be spliced ​​by four rectangular structures. The composition of the spliced ​​structure is not limited in the embodiments of the present application.

[0050] Figure 3 The top-sectional structure of the folding cover plate of the first embodiment of the present application is shown.

[0051] refer to Figure 3 In the first embodiment of the present application, there is a folding reserved space 3 between the third protective layer 2 and all edges of the ultra-thin glass 1. In this way, it can be ensured that during the bending process of the ultra-thin glass 1, all edges do not abut against the third protective layer 2, thereby ensuring that the ultra-thin glass 1 is not damaged due to stress concentration.

[0052] Figure 4 The top-sectional structure of the folding cover plate of the second embodiment of the present application is shown. Figure 1 The cross-sectional view obtained by cutting along BB is Figure 5 . Figure 5 The side cross-sectional structure of the folding cover plate of the second embodiment of the present application is shown.

[0053] refer to Figure 4 and Figure 5 In the second embodiment of the present application, the third protective layer 2 includes a first portion 201 and a second portion 202. The first portion 201 is arranged along the folding direction of the folding cover, and the second portion 202 is arranged along the folding direction perpendicular to the folding cover. A folding reserved space 3 is arranged between the first portion 201 and the edge of the ultra-thin glass 1.

[0054] In this embodiment, the folding reserved space 3 is provided along the folding direction of the folding cover plate, and no folding reserved space 3 is provided in other directions.

[0055] When the ultra-thin glass 1 is bent, the displacement mainly occurs at the two edges where the ultra-thin glass 1 is bent. Therefore, by providing the folding reserved space 3 around the two edges where the ultra-thin glass 1 is bent, the stress concentration when the ultra-thin glass 1 is bent can be reduced. In addition, there is no need to provide the folding reserved space 3 in other directions, and the third protective layer 2 can abut against the ultra-thin glass 1 in other directions, thereby improving the protective effect of the ultra-thin glass 1.

[0056] Considering that when the folding reserved space 3 is too small, it cannot play a good effect of reducing stress concentration, and when the folding reserved space 3 is too large, it will affect the protective effect of the third protective layer 2 on the ultra-thin glass 1. Therefore, it is necessary to design the size of the folding reserved space 3 to prevent the folding reserved space 3 from being too small or too large.

[0057] As an optional embodiment, the size of the folding reserved space 3 is determined according to the folding radius of the folding cover plate. In some embodiments, the width of the folding reserved space 3 may be 5 μm-30 μm.

[0058] In some embodiments, the folding trajectory of the folding cover is the same as the folding trajectory of the folding display device assembled therein, and may include inward folding and outward folding. When folding inward, the upper surface of the folding cover is folded relative to each other, so that the folding cover is located inside the folding display device after the inward folding. When folding outward, the upper surface of the folding cover is folded toward each other, so that the folding cover is located outside the folding display device after the outward folding. It can be seen that for a folding display device of the same thickness, the folding radius of the folding cover when the folding display device is folded outward is greater than the folding radius of the folding cover when the folding display device is folded outward. When the folding cover is folded inward and outward respectively, the bending degree of the ultra-thin glass 1 is different and is related to the folding radius of the folding cover, so the folding radius of the folding cover can be determined according to the folding trajectory of the folding cover, and then the size of the folding reserved space 3 is determined. Because the folding radius of the folding cover when folding outward is greater than the folding radius of the folding cover when folding inward, the deformation of the ultra-thin glass 1 when folding outward is greater than the deformation of the ultra-thin glass 1 when folding inward, so that the size of the folding reserved space 3 of the folding cover when folding outward is larger. Therefore, in some embodiments, the width of the folding reserved space 3 of the folding cover plate with an inward folding trajectory may be 5 μm-20 μm, and the width of the folding reserved space 3 of the folding cover plate with an outward folding trajectory may be 15 μm-30 μm.

[0059] In other embodiments, the bending degree of the ultra-thin glass 1 is also related to the thickness of the folding display device assembled therein, and the folding cover plates of the folding display devices with different thicknesses having the same folding track have different folding radii, especially the thickness of the folding display device with an outward folding track has a greater influence on the bending degree of the ultra-thin glass 1. Therefore, the size of the folding radius also needs to be determined according to the thickness of the folding display device, and thus the size of the folding reserved space 3 is determined according to the size of the folding radius.

[0060] In other embodiments, the size of the folding reserved space 3 also needs to take into account the actual displacement of the ultra-thin glass 1 when it is bent. In specific implementation, the ultra-thin glass 1 can be tested for bending according to the pre-designed thickness of the folding display device and the bending trajectory, and the size of the folding radius can be adjusted according to the actual displacement of the ultra-thin glass 1 during the test bending, and then the size of the folding reserved space 3 can be determined according to the adjusted folding radius.

[0061] In this way, the folding radius can be determined according to the folding trajectory, the thickness of the folding display device and the actual displacement during bending, and then the size of the folding reserved space 3 can be determined according to the folding radius to prevent the folding reserved space 3 from being too small or too large.

[0062] As an optional embodiment, the third protective layer 2 is made of a flexible material.

[0063] In the present embodiment, the third protective layer 2 may be a pre-prepared flexible material gasket, for example, a PET gasket, that is, when the third protective layer 2 is an integral structure, the third protective layer 2 is a pre-prepared integral flexible material gasket, and when the third protective layer 2 is a spliced ​​structure, the third protective layer 2 is obtained by splicing a plurality of pre-prepared flexible material gaskets. PET material is a common resin with good mechanical properties, high impact strength, good folding resistance, and high transparency. Therefore, PET material can be used as a protective layer of ultra-thin glass 1 to provide good protection for ultra-thin glass 1. The material of the flexible material gasket is not limited in the present embodiment of the application, and any flexible material that can protect ultra-thin glass 1 is sufficient.

[0064] As another optional embodiment, the material of the first part 201 is a flexible material, and the material of the second part 202 is optical adhesive.

[0065] In this embodiment, the first region 2 may be a pre-prepared flexible material gasket, for example, a PET gasket. The material of the flexible material gasket is not limited in this embodiment of the application, and any flexible material that can protect the ultra-thin glass 1 is sufficient. The optical glue is soft before curing, and degassing will be performed during the assembly process, so that the optical glue can completely wrap the ultra-thin glass 1 without any gap between the ultra-thin glass 1, and protect the ultra-thin glass 1 after curing.

[0066] In a specific implementation, a flexible material gasket is placed on two sides of the ultra-thin glass 1 along the folding direction of the folding cover, and the space between the flexible material gasket and the ultra-thin glass 1 is the size of the designed folding reserved space 3, that is, the first area 2 of the third protective layer 2 is formed. Subsequently, optical glue is applied to the other two sides of the ultra-thin glass 1 perpendicular to the folding direction of the folding cover, and the optical glue is cured to form the second area 9 of the third protective layer 2. Figure 3 In some embodiments, after forming the first region 2 of the third protective layer 2, the first protective layer and the second protective layer can be formed on the upper and lower surfaces of the ultra-thin glass 1, and then the optical glue is excessively filled between the first protective layer and the second protective layer, so that the optical glue protrudes from the region between the first protective layer and the second protective layer, and then the optical glue is cured to obtain the second region 9 of the third protective layer 2. After forming the first protective layer and the second protective layer, the second region 9 is formed, so that the second region 9 can more completely wrap the ultra-thin glass 1, ensuring the protective effect of the third protective layer 2.

[0067] In this way, by respectively forming the first region 2 and the second region 9 of the third protective layer 2 , the folding reserved space 3 between the first region 2 and the ultra-thin glass 1 is made to be an accurate pre-designed size.

[0068] refer to Figure 2 and Figure 3 As an optional embodiment, the first protective layer includes a first flexible material layer 4 and a first optical adhesive layer 5 located between the first flexible material layer 4 and the ultra-thin glass 1 .

[0069] In this embodiment, the material of the first flexible material layer 4 can be PET. The material of the first flexible material layer 4 is not limited in this embodiment of the application, and any flexible material that can protect the ultra-thin glass 1 is sufficient. The first optical adhesive layer 5 bonds the first flexible material layer 4 to the ultra-thin glass 1, so that the first flexible material layer 4 is stably covered on the ultra-thin glass 1.

[0070] The thickness of the first flexible material layer 4 and the thickness of the first optical adhesive layer 5 are both set according to the thickness of the ultra-thin glass 1. When the thickness of the ultra-thin glass 1 is thin, the thickness of the first flexible material layer 4 and the first optical adhesive layer 5 is thicker. In some embodiments, the thickness of the first flexible material layer 4 can be 25 μm-100 μm, and the thickness of the first optical adhesive layer 5 can be 30 μm-150 μm.

[0071] In specific implementation, according to the product characteristics of the folding display panel assembled by the folding cover plate and the customer's characteristic requirements, the first protective layer may also include other flexible material layers to improve the protection performance of the ultra-thin glass 1.

[0072] In this way, by providing a flexible material layer in the first protective layer, the ultra-thin glass 1 is buffered, thereby reducing the impact of external forces on the ultra-thin glass 1 and preventing the ultra-thin glass 1 from being damaged during the subsequent assembly process.

[0073] As an optional embodiment, the second protective layer includes a second flexible material layer 6 and a second optical adhesive layer 7 located between the second flexible material layer 6 and the ultra-thin glass 1 .

[0074] In this embodiment, the material of the second flexible material layer 6 can be PET or CPI. CPI material is a colorless and transparent material developed on the basis of traditional PI (polyimide) material, and has similar material properties to traditional PI material, that is, it has excellent mechanical properties. Therefore, CPI material can be used as a protective layer of ultra-thin glass 1 to provide good protection for ultra-thin glass 1. The material of the second flexible material layer 6 is not limited in this embodiment of the application, and any flexible material that can protect ultra-thin glass 1 is sufficient. The second optical adhesive layer 7 bonds the second flexible material layer 6 to the ultra-thin glass 1, so that the second flexible material layer 6 is firmly covered on the ultra-thin glass 1.

[0075] The thickness of the second flexible material layer 6 and the thickness of the second optical adhesive layer 7 are both set according to the thickness of the ultra-thin glass 1. When the thickness of the ultra-thin glass 1 is thin, the thickness of the second flexible material layer 6 and the second optical adhesive layer 7 is thicker. In some embodiments, the thickness of the second flexible material layer 6 can be 25 μm-100 μm, and the thickness of the second optical adhesive layer 7 can be 30 μm-150 μm.

[0076] In specific implementation, according to the product characteristics of the folding display panel assembled by the folding cover plate and the customer's characteristic requirements, the second protective layer may also include other flexible material layers to improve the protection performance of the ultra-thin glass 1.

[0077] In this way, by providing a flexible material layer in the second protective layer, the ultra-thin glass 1 is buffered, thereby reducing the impact of external forces on the ultra-thin glass 1 and preventing the ultra-thin glass 1 from being damaged during the subsequent assembly process.

[0078] As an optional embodiment, the second protective layer further includes an ink layer 8 disposed between the second flexible material layer 6 and the second optical adhesive layer 7 .

[0079] In this embodiment, the ink layer 8 is a black light-proof layer and may be located above the third protective layer 2 .

[0080] In this way, the third protective layer 2 is shielded by providing the ink layer 8 to prevent the third protective layer 2 from being observed from the outside, making the folding cover more beautiful.

[0081] As an optional embodiment, the edge of the ink layer 8 coincides with the edge of the ultra-thin glass 1 .

[0082] In this embodiment, the ultra-thin glass 1 is arranged corresponding to the light-emitting area of ​​the foldable display device. Therefore, in order to prevent light leakage from the area outside the light-emitting area, the edge of the ink layer 8 is arranged to overlap with the edge of the ultra-thin glass 1, thereby shielding the light leakage of the ultra-thin glass 1 and avoiding light leakage.

[0083] Considering that when manufacturing the folding cover, the edge of the ink layer 8 may not be accurately overlapped with the edge of the ultra-thin glass 1 due to process limitations or process errors, and when the edges do not overlap, light leakage will still occur. Therefore, it is necessary to set a process margin for the ink layer 8 to ensure that the ink layer 8 can cover the edge of the ultra-thin glass 1.

[0084] As another optional embodiment, the projection of the ink layer 8 on the ultra-thin glass 1 at least partially overlaps with the ultra-thin glass 1 .

[0085] In this embodiment, the ink layer 8 exceeds the edge of the ultra-thin glass 1 , for example, may exceed the edge of the ultra-thin glass 1 by 5 μm-10 μm.

[0086] In this way, the ink layer 8 is used to cover the edge area of ​​the ultra-thin glass 1, ensuring that when making the folding cover, the ink layer 8 can shield the area outside the light-emitting area to avoid light leakage.

[0087] As another optional embodiment, the ink layer 8 can be disposed on the surface of the second flexible material layer 6 away from the second optical adhesive layer 7, or between the ultra-thin glass 1 and the first optical adhesive layer 5, or between the ultra-thin glass 1 and the second optical adhesive layer 7. The embodiment of the present application does not limit the position of the ink layer 8, as long as the ink layer 8 can block the light leakage in the area outside the light-emitting area.

[0088] refer to Figure 2 and Figure 3 In some embodiments, when forming the third protective layer 2, sufficient excess material is reserved at the outer edge of the third protective layer 2. After being assembled into the folding cover plate and the folding display panel, the excess material of the folding cover plate and the rest of the folding display panel can be cut off together through a laser integrated cutting process. The dotted line in the figure is the position of the laser integrated cutting.

[0089] In this way, by providing the surplus material, the volume of the third protective layer 2 is increased during the assembly process, the protective effect of the third protective layer 2 is enhanced, and it is further ensured that the ultra-thin glass 1 is not damaged during the assembly process.

[0090] As an optional embodiment, it further includes an impact-resistant layer disposed on the second protective layer.

[0091] In this embodiment, the impact-resistant layer is a layer with high strength, which is used to significantly reduce the impact of external force on the folding cover from the upper surface of the folding cover. The material of the impact-resistant layer can be at least one of polyester resin (PET), polymethyl methacrylate (PMMA), triacetyl cellulose (TAC), polycycloolefin (COP), and polyimide (PI). These materials have high strength and can significantly reduce the impact transmitted to the remaining layers of the folding cover after receiving external force, ensuring that the folding cover is not damaged.

[0092] As an optional embodiment, an anti-glare layer is further included on the second protective layer.

[0093] In this embodiment, the anti-glare layer may be an AR (anti-reflection) film. The AR film can reduce the reflection of light by the folding cover, thereby preventing the folding cover from generating glare and improving the display effect of the folding display device assembled with the folding cover.

[0094] Based on the same inventive concept, corresponding to the folding cover of any of the above embodiments, the present application further provides a method for manufacturing the folding cover, comprising:

[0095] A first layer 4 of flexible material is provided.

[0096] A first optical adhesive layer 5 is formed.

[0097] An ultra-thin glass 1 is placed on the first optical adhesive layer 5 , and a third protective layer 2 is formed.

[0098] A second optical adhesive layer 7 is formed.

[0099] A second flexible material layer 6 is formed.

[0100] Perform laser integrated cutting process to remove excess material.

[0101] Based on the same inventive concept, corresponding to the folding cover plate of any of the above embodiments, the present application also provides a folding display panel, including the folding cover plate of any of the above embodiments.

[0102] Based on the same inventive concept, corresponding to the folding display panel of the above embodiment, the present application also provides a folding display device, including the folding display panel of the above embodiment.

[0103] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0104] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0105] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A folding cover, It is characterized in that include: A first protective layer, an ultra-thin glass, and a second protective layer are stacked; The folding cover plate further includes: a third protective layer which is in the same layer as the ultra-thin glass and is arranged around the ultra-thin glass; A folding reserved space is provided between the third protective layer and the edge of the ultra-thin glass.

2. The folding cover according to claim 1, It is characterized in that The third protective layer includes a first part and a second part, the first part is arranged along the folding direction of the folding cover, and the second part is arranged along the folding direction perpendicular to the folding cover; a folding reserved space is arranged between the first part and the edge of the ultra-thin glass.

3. The folding cover according to claim 1, It is characterized in that The size of the folding reserved space is determined according to the folding radius of the folding cover.

4. The folding cover according to claim 1, It is characterized in that The third protective layer is made of flexible material.

5. The folding cover according to claim 2, It is characterized in that The material of the first part is a flexible material, and the material of the second part is an optical adhesive.

6. The folding cover according to claim 1, It is characterized in that The first protective layer includes a first flexible material layer and a first optical adhesive layer located between the first flexible material layer and the ultra-thin glass.

7. The folding cover according to claim 1, It is characterized in that The second protective layer includes a second flexible material layer and a second optical adhesive layer located between the second flexible material layer and the ultra-thin glass.

8. The folding cover according to claim 7, It is characterized in that The second protective layer further includes an ink layer disposed between the second flexible material layer and the second optical adhesive layer.

9. The folding cover according to claim 8, It is characterized in that The projection of the ink layer on the ultra-thin glass at least partially overlaps with the ultra-thin glass.

10. The folding cover according to claim 1, It is characterized in that Also included is an impact resistant layer disposed on the second protective layer.

11. The folding cover according to claim 1, It is characterized in that Also included is an anti-glare layer disposed on the second protective layer.

12. A foldable display panel, It is characterized in that Comprising the folding cover plate as claimed in any one of claims 1 to 11.

13. A foldable display device, It is characterized in that Comprising the foldable display panel as claimed in claim 12.

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