Cover plate and display device

Abstract

The embodiment of the utility model provides a cover plate and a display device. The cover plate comprises ultra-thin glass, a transparent optical adhesive layer arranged on one side of the ultra-thin glass and a flexible film layer arranged on the side, away from the ultra-thin glass, of the transparent optical adhesive layer. The flexible film layer comprises a light-transmitting area located in the middle and a shading area arranged around the light-transmitting area. The flexible film layer is flush with the outer boundary of the transparent optical adhesive layer, the outer boundary of the ultra-thin glass shrinks inwards relative to the outer boundary of the flexible film layer and the outer boundary of the transparent optical adhesive layer to form a first fault, and a protective layer is arranged on at least one of the upper surface, the lower surface and the side surface of the ultra-thin glass and at least close to the first fault. The width of the first fault is smaller than that of the shading area. The cover plate is provided with the protective layer, so that the problem that ultrathin glass is easy to break in the cutting process can be solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a cover plate and a display device. Background Art

[0002] Flexible display devices can be folded, rolled or bent, and have attracted the attention of consumers for their portability and convenience. However, the display panel of flexible display devices is not strong enough. In order to improve the strength of the display panel, a layer of ultra-thin glass cover is bonded on its surface. However, the ultra-thin glass cover cannot be laser cut, so it needs to be retracted a certain distance during design. This leads to the inevitable existence of faults at the cutting line due to the break caused by the retraction of the ultra-thin glass. When cutting, the ultra-thin glass is easily broken due to the influence of laser heat. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a cover plate and a display device to solve the problem that the cover plate is easily broken during cutting. The specific technical solution is as follows:

[0004] According to a first aspect of the present application, there is provided a cover plate, comprising an ultra-thin glass, a transparent optical adhesive layer arranged on one side of the ultra-thin glass, and a flexible film layer arranged on a side of the transparent optical adhesive layer away from the ultra-thin glass; the flexible film layer comprises a light-transmitting area located in the middle and a light-shielding area arranged around the light-transmitting area; the flexible film layer is flush with an outer boundary of the transparent optical adhesive layer, and the outer boundary of the ultra-thin glass is retracted relative to the outer boundaries of the flexible film layer and the transparent optical adhesive layer to form a first fault, and at least one of the upper surface, lower surface and side surface of the ultra-thin glass, and at least a portion close to the first fault, is provided with a protective layer, and the width of the first fault is smaller than the width of the light-shielding area.

[0005] In addition, the cover plate provided according to the first aspect of the present application may also have the following technical features:

[0006] In some embodiments, the transparent optical adhesive layer is OCA adhesive, and the protective layer is thermally conductive adhesive; the thermally conductive adhesive wraps the upper surface and side surface of one end of the ultra-thin glass close to the first fault; or, the thermally conductive adhesive wraps the lower surface and side surface of one end of the ultra-thin glass close to the first fault; or, the thermally conductive adhesive wraps the upper surface, lower surface and side surface of one end of the ultra-thin glass close to the first fault.

[0007] In some embodiments, the thermally conductive adhesive includes resin and filler, and the filler is a thermally conductive and insulating material.

[0008] In some embodiments, the filler is a mixture of aluminum nitride, boron nitride, and one or more of silicon nitride, aluminum oxide, magnesium oxide, and zinc oxide.

[0009] In some embodiments, the width of the first overlapping portion of the protective layer and the ultra-thin glass is less than or equal to the width of the shading area, and the thickness of the first overlapping portion is less than the thickness of the transparent optical adhesive layer; the width of the second overlapping portion of the protective layer and the first fault does not exceed the outer boundary of the flexible film layer and the transparent optical adhesive layer.

[0010] In some embodiments, the width of the first overlapping portion between the protective layer and the ultra-thin glass is less than or equal to 500 μm, and the thickness of the first overlapping portion is less than or equal to 5 μm; the width of the second overlapping portion between the protective layer and the first fault is less than or equal to 50 μm.

[0011] In some embodiments, the thickness of the flexible film layer is 20 μm-200 μm, the thickness of the transparent optical adhesive layer is 10 μm-100 μm, and the thickness of the ultra-thin glass is 10 μm-100 μm.

[0012] In some embodiments, the transparent optical adhesive layer is OCA adhesive, the protective layer is a polymer, the polymer fills the first fault layer and has the same thickness as the ultra-thin glass.

[0013] In some embodiments, the polymer is polyimide, polyethylene terephthalate, thermoplastic polyurethane, polymethyl methacrylate, or polyurethane.

[0014] In some embodiments, the transparent optical adhesive layer is OCA adhesive, the protective layer is OCR adhesive, the OCR adhesive fills the first fault and covers the side of the ultra-thin glass away from the transparent optical adhesive layer, and the thickness of the protective layer is greater than the thickness of the ultra-thin glass.

[0015] In some embodiments, the transparent optical adhesive layer is OCR adhesive, and the protective layer is OCR adhesive; the OCR adhesive fills the first fault layer, and the thickness of the OCR adhesive is the same as the thickness of the ultra-thin glass; or, the OCR adhesive fills the first fault layer and covers the side of the ultra-thin glass away from the transparent optical adhesive layer, and the thickness of the protective layer is greater than the thickness of the ultra-thin glass.

[0016] In some embodiments, a light-shielding material is coated on a side of the flexible film layer close to the transparent optical adhesive layer to form the light-shielding area.

[0017] A second aspect of the present application provides a display device, which includes the cover plate described above.

[0018] Beneficial effects of the embodiments of the present application:

[0019] The cover plate and display device provided by the embodiment of the present application, wherein the light-transmitting area in the middle of the flexible film layer of the cover plate is used for light to pass through, and the outer light-shielding area is used to prevent light leakage from the edge. And the width of the light-shielding area is greater than the width of the first fault, so that the light-shielding area covers a part of the ultra-thin glass, so that the outgoing light must pass through the three layers of ultra-thin glass, transparent optical adhesive layer and flexible film layer, reducing the risk of uneven light emission at the edge. The width of the first fault is greater than the first distance from the cover plate boundary to the cutting line, so that the cutting position of the cutting line is in the first fault area, so the ultra-thin glass will not be cut during the cutting process, so the ultra-thin glass can be prevented from being broken during the cutting process. The cutting line is cut along the thickness direction of the cover plate to ensure the flatness of the cutting edge. By setting a protective layer on at least one of the upper surface, lower surface and side surface of the ultra-thin glass, and at least the part close to the first fault, the protective layer can quickly diffuse the instantaneous heat of laser cutting, reduce the influence of thermal stress on the ultra-thin glass, thereby protecting the ultra-thin glass and preventing the ultra-thin glass from breaking during the laser cutting process.

[0020] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the structure of a cover plate provided in an embodiment of the present application, wherein a protective layer is provided on the upper surface of the ultra-thin glass close to the first fault;

[0023] Figure 2 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on the upper surface of the ultra-thin glass near the first fault;

[0024] Figure 3 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on the lower surface of the ultra-thin glass near the first fault;

[0025] Figure 4 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on a side surface of the ultra-thin glass close to the first fault;

[0026] Figure 5A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on the upper surface and side surface of the ultra-thin glass close to the first fault;

[0027] Figure 6 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on the lower surface and side surface of the ultra-thin glass near the first fault;

[0028] Figure 7 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein a protective layer is provided on the upper surface, the lower surface and the side surface of the ultra-thin glass near the first fault;

[0029] Figure 8 Schematic diagram of design parameters for the protective layer;

[0030] Fig. 9 A schematic diagram of the structure of a cover plate provided in an embodiment of the present application, wherein the protective layer is attached to the first fault layer;

[0031] Fig.10 A schematic diagram of the structure of a cover plate before cutting provided in an embodiment of the present application, wherein the protective layer is attached to the first fault layer;

[0032] Fig.11 A schematic diagram of the structure of a cover plate before cutting provided in an embodiment of the present application, wherein a protective layer is applied in a first fault layer;

[0033] Fig.12 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein the lower side of the protective layer half-wraps the ultra-thin glass;

[0034] Fig.13 A schematic diagram of the structure of a cutting front cover plate in an embodiment of the present application, wherein the upper side of the protective layer and the transparent optical adhesive layer half-wraps the ultra-thin glass;

[0035] Fig.14 A schematic structural diagram of a cutting front cover plate in one embodiment provided in an embodiment of the present application, wherein a protective layer and a transparent optical adhesive layer fully wrap the ultra-thin glass.

[0036] The accompanying drawings are marked as follows: cover plate 100; cover plate 100' before cutting; ultra-thin glass 101; transparent optical adhesive layer 102; flexible film layer 103; light-transmitting area 1031; light-shielding area 1032; first fault 104; protective layer 105; cutting line 106; ink 107; first protective film 108; second protective film 109; display panel 200; supporting mechanism 300; first adhesive layer 400; second adhesive layer 500; width A of the first fault; width B of the light-shielding area; width a of the first fault before cutting; width b of the light-shielding area before cutting; first distance c; width d1 of the first overlapping part; width d2 of the second overlapping part; thickness h1 of the first overlapping part; interval S. DETAILED DESCRIPTION

[0037] 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 based on the present application belong to the scope of protection of the present application.

[0038] In a first aspect, an embodiment of the present application provides a cover plate 100, such as Figure 1 The structure diagram of the cover plate 100 is shown, and the cover plate 100 includes an ultra-thin glass 101, a transparent optical adhesive layer 102 disposed on one side of the ultra-thin glass 101, and a flexible film layer 103 disposed on the side of the transparent optical adhesive layer 102 away from the ultra-thin glass 101. The flexible film layer 103 includes a light-transmitting area 1031 located in the middle and a light-shielding area 1032 disposed around the light-transmitting area 1031. The flexible film layer 103 is flush with the outer boundary of the transparent optical adhesive layer 102, and the outer boundary of the ultra-thin glass 101 is retracted relative to the outer boundaries of the flexible film layer 103 and the transparent optical adhesive layer 102 to form a first fault 104. A protective layer 105 is disposed on at least one of the upper surface, the lower surface, and the side surface of the ultra-thin glass 101, and at least the portion close to the first fault 104, and the width A of the first fault is less than the width B of the light-shielding area.

[0039] To explain in detail the role of the first fault layer 104 in the cutting process, Figure 2-Figure 7The diagram shows the schematic diagram of the cover plate 100' before cutting. As can be seen from the figure, the width a of the first fault before cutting is smaller than the width b of the shading area before cutting, so that after cutting along the cutting line 106, the width A of the first fault is smaller than the width B of the shading area, and then the shading area 1032 covers a part of the ultra-thin glass 101, so that the outgoing light must pass through the three layers of ultra-thin glass 101, transparent optical adhesive layer 102 and flexible film layer 103, reducing the risk of uneven light emission at the edge. And the width a of the first fault before cutting is greater than the first distance c from the boundary of the cover plate 100' to the cutting line 106 before cutting, so that the cutting position of the cutting line 106 is in the first fault 104 area, so the ultra-thin glass 101 will not be cut during the cutting process, thereby avoiding the ultra-thin glass 101 from being broken during the cutting process. The cutting line 106 is cut along the thickness direction of the cover plate 100 to ensure the flatness of the cutting edge.

[0040] The light-transmitting area 1031 in the middle of the flexible film layer 103 is used for light to pass through, and the light-shielding area 1032 on the periphery is used to prevent light leakage from the edge. The width B of the light-shielding area is greater than the width A of the first fault, so that the light-shielding area 1032 covers a portion of the ultra-thin glass 101, so that the outgoing light must pass through the three layers of ultra-thin glass 101, transparent optical adhesive layer 102 and flexible film layer 103, thereby reducing the risk of uneven light emission at the edge. By providing a protective layer 105 on at least one of the upper surface, lower surface and side surface of the ultra-thin glass 101, and at least the portion close to the first fault 104, the protective layer 105 can quickly diffuse the instantaneous heat of laser cutting, reduce the influence of thermal stress on the ultra-thin glass 101, thereby protecting the ultra-thin glass 101 and preventing the ultra-thin glass 101 from breaking during the laser cutting process.

[0041] Among them, at least one of the upper surface, lower surface and side surface of the ultra-thin glass 101 refers to one surface of the ultra-thin glass 101, such as the upper surface, lower surface or side surface, provided with a protective layer 105, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 or two surfaces of the ultra-thin glass 101, such as the upper surface and the side surface, the lower surface and the side surface, or the lower surface and the upper surface are provided with a protective layer 105, such as Figure 5 and Figure 6 Or the three surfaces of the ultra-thin glass 101, namely the upper surface, the lower surface and the side surface are provided with a protective layer 105, such as Figure 7At least the portion close to the first fault 104 is covered with a protective layer 105. The protective layer 105 may be provided only at a position close to the first fault 104, or may be extended to other areas, such as the entire first fault 104, or the entire first fault 104 plus the entire lower surface of the ultra-thin glass 101, etc., and the present application does not impose any limitation on this.

[0042] The flexible film layer 103 may be a transparent organic film such as polyimide (PI), polyethylene terephthalate (PET), cycloolefin polymer (COP), triacetyl cellulose (TAC), etc.

[0043] The thickness of the flexible film layer 103 can be 20μm-200μm, for example, 50μm, 75μm, 100μm, 150μm, etc. The thickness of the transparent optical adhesive layer 102 is 10μm-100μm, for example, 35μm, 50μm, 75μm, 100μm, etc. The thickness of the ultra-thin glass 101 is 10μm-100μm, for example, 25μm, 30μm, 40μm, etc.

[0044] The thickness of the flexible film layer 103 varies according to the material selected. Similarly, the thickness of the transparent optical adhesive layer 102 varies according to the material selected. The ultra-thin glass 101 is appropriately adjusted according to the thickness difference between the flexible film layer 103 and the transparent optical adhesive layer 102, so that the thickness of the cover plate 100 is within a suitable range, which can not only meet the thickness requirement, but also improve the mechanical properties of the cover plate 100, such as impact resistance.

[0045] Optionally, the room temperature tensile modulus of the transparent optical adhesive layer 102 is greater than 20 Kpa and less than 100 Kpa. The tensile modulus represents the degree of deformation of the material under tensile stress, and records the stiffness and elastic properties of the material. If the room temperature tensile modulus of the transparent optical adhesive layer 102 is less than 20 Kpa, the material stiffness of the transparent optical adhesive layer 102 is too small, and the stiffness of the display cover plate 100 is too small, and the impact resistance of the display cover plate 100 cannot be improved. The room temperature tensile modulus of the transparent optical adhesive layer 102 is greater than 100 Kpa, and the room temperature tensile modulus continues to increase, the impact resistance of the cover plate 100 is not significantly improved, and it is not conducive to the bending of the cover plate 100. Therefore, by regulating the tensile modulus of the material of the second layer at room temperature to less than 100 Kpa, the stiffness of the cover plate 100 is increased while being conducive to the bending of the cover plate 100, thereby improving the impact resistance of the cover plate 100. Thus, the cover plate 100 can protect the display panel 200, reduce the risk of damage when impacted by external force, reduce the risk of problems such as bright spots or package cracks in the display device, and extend the service life of the display device.

[0046] In some embodiments, Figure 5 As shown, the transparent optical adhesive layer 102 is OCA adhesive, and the protective layer 105 is thermal conductive adhesive. The thermal conductive adhesive wraps the upper surface and the side surface of the end of the ultra-thin glass 101 close to the first fault 104 .

[0047] OCA (Optically Clear Adhesive) glue is a special adhesive used to bond transparent optical components (such as lenses, etc.). OCA glue is colorless and transparent, has a light transmittance of more than 95%, good bonding strength, can be cured at room temperature or medium temperature, and has small curing shrinkage. OCA glue has high clarity, high light transmittance (total light transmittance>99%), high adhesion, high weather resistance, water resistance, high temperature resistance, UV resistance, controlled thickness, and provides uniform spacing. It will not cause yellowing, peeling, or deterioration after long-term use.

[0048] The protective layer 105 is a thermally conductive adhesive having good thermal conductivity and can quickly conduct heat generated by laser cutting to avoid affecting the ultra-thin glass 101 .

[0049] The thermal conductive adhesive wraps the upper surface and side surface of the ultra-thin glass 101 close to the first fault 104, which can block the propagation path of laser heat to the ultra-thin glass 101, and the thermal conductive adhesive can quickly diffuse the instantaneous heat generated by laser cutting, better protect the ultra-thin glass 101 from thermal stress, and avoid the ultra-thin glass 101 from cracking during the laser cutting process.

[0050] In some embodiments, Figure 6As shown, the transparent optical adhesive layer 102 is OCA adhesive, and the protective layer 105 is thermally conductive adhesive, which wraps the lower surface and the side surface of the ultra-thin glass 101 at one end close to the first fault 104. The thermally conductive adhesive plays a role in blocking the propagation path of laser heat, and the thermally conductive adhesive can quickly diffuse the instantaneous heat generated by laser cutting, so as to better protect the ultra-thin glass 101 from thermal stress and prevent the ultra-thin glass 101 from breaking during the laser cutting process.

[0051] Alternatively, if Figure 7 As shown, in some embodiments, the transparent optical adhesive layer 102 is OCA adhesive, the protective layer 105 is thermally conductive adhesive, and the thermally conductive adhesive wraps the upper surface, lower surface and side surface of the end of the ultra-thin glass 101 close to the first fault 104.

[0052] In this embodiment, the thermal conductive adhesive completely wraps the end of the ultra-thin glass 101 close to the first fault 104, which better prevents the laser heat from propagating to the surface of the ultra-thin glass 101, thereby better protecting the ultra-thin glass 101 from thermal stress and preventing the ultra-thin glass 101 from breaking during the laser cutting process.

[0053] In some embodiments, the thermally conductive adhesive includes a resin and a filler, wherein the filler is a thermally conductive and insulating material.

[0054] The resin is the base material of the thermal conductive adhesive and mainly plays a curing role. The filler is an insulating material with good thermal conductivity and mainly improves the thermal conductivity of the thermal conductive adhesive. The thermal conductive adhesive is composed of the resin and the filler, so that the thermal conductive adhesive can be well attached to the surface of the ultra-thin glass 101 and has good heat dissipation ability.

[0055] Optionally, the filler is a mixture of one or more of aluminum nitride (AlN), boron nitride (BN), silicon nitride (Si3N4), aluminum oxide (Al2O3), magnesium oxide (MgO), and zinc oxide (ZnO). When the filler is a mixture of multiple materials, it is only mixed in physical state and does not react with each other.

[0056] The width A of the first fault, i.e., the shrinkage, needs to be designed taking into account the tolerance a1 between the ink edge of the cover plate 100 and the outer boundary of the ultra-thin glass 101, the ink edge and the active display area (AA area) a2 of the display panel 200, the alignment accuracy a3 of the laser cutting, and the length d of the heat-affected zone of the laser cutting. In general, the shrinkage X of the ultra-thin glass is the square root of the sum of the squares of a1, a2, and a3 plus the length d of the heat-affected zone, i.e. The product requires that the shrinkage of the ultra-thin glass 101 is as small as possible, so that the edge support strength can be improved at the existing level. In the embodiment of the present application, due to the provision of the protective layer 105, the shrinkage is the square root of the sum of the squares of a1, a2, and a3, that is, The influence of the heat-affected zone need not be considered, which is beneficial to reducing the shrinkage value of the ultra-thin glass 101.

[0057] like Figure 1-Figure 7 In the illustrated embodiment, the protective layer 105 covers one end of the ultra-thin glass 101 close to the first fault layer 104, the width d1 of the first overlapping portion of the protective layer 105 and the ultra-thin glass 101 is less than or equal to the width of the shading area, and the thickness h1 of the first overlapping portion is less than the thickness of the transparent optical adhesive layer 102; the width d2 of the second overlapping portion of the protective layer 105 and the first fault layer 104 does not exceed the outer boundary of the flexible film layer 103 and the transparent optical adhesive layer 102.

[0058] exist Figure 1-Figure 7 In the embodiment shown, the main function of the protective layer 105 is to protect the ultra-thin glass 101 and reduce the effect of heat during laser cutting on the ultra-thin glass 101, thereby preventing the ultra-thin glass 101 from breaking. The side of the ultra-thin glass 101 close to the first fault 104 is the area closer to the cutting line and is most susceptible to the heat of the laser. Therefore, providing the protective layer 105 on the side of the ultra-thin glass 101 close to the first fault 104 can give full play to the function of the protective layer 105. Figure 8 As shown, the width d1 of the first overlapping portion of the protective layer 105 and the ultra-thin glass 101 is less than or equal to the width of the shading area, so that the periphery of the cover plate 100 is graphite black, ensuring the consistency of appearance. The thickness h1 of the first overlapping portion is less than the thickness of the transparent optical adhesive layer 102, so that the protective layer 105 can protect the ultra-thin glass 101 while not increasing the thickness of the cover plate 100, which is conducive to the thinness of the cover plate 100. The width d2 of the second overlapping portion of the protective layer 105 and the first fault layer 104 does not exceed the outer boundary of the flexible film layer 103 and the transparent optical adhesive layer 102, so that the cutting line 106 will not cut the protective layer 105 when cutting. The protective layer 105 can block the propagation path of the laser heat to the ultra-thin glass 101 during the cutting process, and the protective layer 105 can quickly diffuse the instantaneous heat generated by laser cutting, better protect the ultra-thin glass 101 from the influence of thermal stress, and avoid the ultra-thin glass 101 from breaking during the laser cutting process.

[0059] Alternatively, if Figure 8 As shown, the width d1 of the first overlapping portion of the protective layer 105 and the ultra-thin glass 101 is less than or equal to 500μm, for example, the width d1 of the first overlapping portion can be 500μm, 450μm, 400μm, etc., and the thickness h1 of the first overlapping portion is less than or equal to 5μm, for example, the thickness h1 of the first overlapping portion can be 5μm, 4.5μm, 4μm, etc.; the width d2 of the second overlapping portion of the protective layer 105 and the first fault 104 is less than or equal to 50μm, for example, the width d2 of the second overlapping portion can be 50μm, 45μm, 40μm, etc.

[0060] The first overlapping portion of the protective layer 105 and the ultra-thin glass 101, that is, the portion of the protective layer 105 covering the upper surface of the ultra-thin glass 101 or the portion of the protective layer 105 covering the lower surface of the ultra-thin glass 101. The first overlapping portion is affected by the heat-affected zone of the laser energy and is related to the distance of the cutting line 106 from the ultra-thin glass 101. Exemplarily, d1≤500μm, which can minimize the impact of the laser energy on the ultra-thin glass 101, thereby preventing the ultra-thin glass 101 from breaking.

[0061] The thickness h1 of the first overlapping portion is ≤50 μm, which can effectively absorb the instantaneous heat generated by laser cutting on one hand, and is beneficial to reducing the overall thickness of the cover plate 100 on the other hand.

[0062] The second overlapping portion of the protective layer 105 and the first fault layer 104 is the portion of the protective layer 105 covering one side of the side surface of the ultra-thin glass 101. The second overlapping portion is the portion closest to the heat-affected zone of the laser energy, and the thickness of this portion can effectively absorb the instantaneous heat generated by laser cutting. The width d2 of the second overlapping portion is ≤50 μm, which can effectively absorb the instantaneous heat generated by laser cutting and is conducive to saving the material of the thermal conductive adhesive.

[0063] Figure 9-11 In the illustrated embodiment, a protective layer 105 is disposed on a side surface of the ultra-thin glass 101 at one end close to the first fault layer 104 , and the protective layer 105 is located inside the first fault layer 104 .

[0064] In some embodiments, Figure 9-11 As shown, Fig. 9 is a schematic structural diagram of the cover plate 100, Fig.10 , Fig.11 It is a schematic diagram of the structure of the front cover plate 100 ′ after cutting. The transparent optical adhesive layer 102 is OCA adhesive, the protective layer 105 is polymer, the polymer fills the first fault layer 104 and has the same thickness as the ultra-thin glass 101 .

[0065] In this embodiment, the polymer fills the air layer between the ultra-thin glass 101 and the transparent optical adhesive layer 102 and the flexible film layer 103 caused by the shrinkage of the ultra-thin glass 101. Therefore, during laser cutting, the protective layer 105 will be cut, which can reduce the risk of directly cutting the air layer, thereby reducing the risk of generating rainbow patterns on the display panel 200 and generating reliability warping.

[0066] On the other hand, the upper and lower surfaces of the ultra-thin glass 101 are bonded with OCA glue, and the upper flexible film layer 103 tends to be pulled downward. If the first fault layer 104 is not filled solidly, it is easy to deform under force and form an appearance dent. Therefore, filling the first end fault with a polymer can also improve the problem of easy dents in appearance.

[0067] Optionally, the polymer may be, but is not limited to, polyimide, polyethylene terephthalate, thermoplastic polyurethanes (TPU), polymethyl methacrylate (PMMA) or polyurethane (PU).

[0068] Among them, Fig. 9 , Fig.10 As shown, polyimide, polyethylene terephthalate, and thermoplastic polyurethane are film materials that can be mounted in the first fault layer 104 between the ultra-thin glass 101 and the transparent optical adhesive layer 102. Considering the existence of mounting errors, there is a certain interval S between the protective layer 105 and the ultra-thin glass 101, and the value range of the interval S is 0.1mm-0.2mm.

[0069] like Fig.11 The structure diagram of the front cover plate 100' before cutting is shown. Polymethyl methacrylate and polyurethane are liquid coating materials, which can be applied to the lower surface of the transparent optical adhesive layer 102 and the side surface of the ultra-thin glass 101, and then cured to form a protective layer 105. The coating can be a needle or spray valve head dispensing method, or it can be an inkjet printing method, and then thermally cured or UV (ultraviolet) cured. Here, polymethyl methacrylate material with a viscosity of 100cps can be selected, and it is made by spray valve printing and UV curing. The modulus after curing is about 3Gpa. The polymer formed by coating in this way can contact the edge of the ultra-thin glass 101 without generating a gap S, which is conducive to improving the processing accuracy.

[0070] Specifically, polyimide is an organic polymer material with excellent high temperature resistance, and the heat resistance temperature can reach above 400°C. Therefore, as the filling material of the first fault 104, it is not easy to deform when heated and can play a good supporting role.

[0071] Polyethylene terephthalate is a polymer compound with excellent physical and mechanical properties in a wide temperature range. The operating temperature can reach 120°C, and the creep resistance, fatigue resistance, friction resistance, and dimensional stability are all very good. Therefore, as the filling material of the first fault layer 104, it is not easy to deform when heated, and can play a good supporting role, avoiding the problem of rainbow lines and reliability warping of the display panel 200 during the cutting process.

[0072] Thermoplastic polyurethane has very good elasticity and flexibility, and has excellent rebound performance and fatigue life. It has very good elasticity, can be used in a wide temperature range, and has excellent compressive resistance. As the filling material of the first fault layer 104, thermoplastic polyurethane can play a good supporting role, avoiding the problem of rainbow lines and reliability warping of the display panel 200 during the cutting process, avoiding the problem of rainbow lines and reliability warping of the display panel 200 during the cutting process.

[0073] Polymethyl methacrylate is a high molecular polymer, also known as acrylic or organic glass, with the advantages of high transparency, low price, and easy mechanical processing. Polymethyl methacrylate has high mechanical strength and good toughness, and is not easy to break. Therefore, filling the first fault layer 104 can effectively improve the support strength at the first fault layer 104, so that the upper flexible film layer 103 is not easy to deform during the cutting process. In addition, due to its good toughness, there are fewer debris during the cutting process, which prevents the debris from entering the display panel 200 and causing the display panel 200 to be defective.

[0074] Polyurethane is a polymer material with good flexibility and elasticity. It is filled in the first fault layer 104 and can play a good supporting role to avoid the problem of rainbow lines and reliability warping of the display panel 200 during the cutting process.

[0075] In some embodiments, Fig.12 The figure shows a schematic diagram of the structure of the cover plate 100' before cutting. The transparent optical adhesive layer 102 is OCA adhesive, and the protective layer 105 is OCR (Optical Clear Resin) adhesive. The OCR adhesive fills the first fault layer 104 and covers the side of the ultra-thin glass 101 away from the transparent optical adhesive layer 102. The thickness of the protective layer 105 is greater than the thickness of the ultra-thin glass 101.

[0076] OCR glue is a liquid optical glue that can be prepared by inkjet printing, so it can be in close contact with the ultra-thin glass 101, so that the OCR glue not only fills the first fault layer 104, but also covers the side of the ultra-thin glass 101 away from the OCA glue, forming a semi-wrapped form for the ultra-thin glass 101. The OCR glue is in close contact with the edge of the ultra-thin glass 101, and the OCR glue can also play a role in fixing the ultra-thin glass 101.

[0077] After curing, the OCR glue is colorless and transparent, with a light transmittance of more than 98%, which has little effect on the light transmittance of the display panel 200. Therefore, the OCR glue can be filled in the light-transmitting area 1031, thereby forming a semi-wrapped form for the ultra-thin glass 101, and better protecting the ultra-thin glass 101. The protective layer 105 fills the first fault layer 104, which can avoid rainbow lines and reliability warping of the display panel 200 during cutting.

[0078] In addition, OCR glue also has the characteristics of small curing shrinkage and yellowing resistance.

[0079] In some embodiments, Fig.13 It is a schematic structural diagram of the cover plate 100 ′ before cutting, the transparent optical adhesive layer 102 is OCR adhesive, the protective layer 105 is OCR adhesive, the OCR adhesive fills the first fault layer 104 , and the thickness of the OCR adhesive is the same as that of the ultra-thin glass 101 .

[0080] The transparent optical adhesive layer 102 and the protective layer 105 are both OCR adhesives, so they can be formed in one step by inkjet printing, simplifying the manufacturing process of the cover plate 100. The transparent optical adhesive layer 102 and the protective layer 105 form a semi-wrapped form for the ultra-thin glass 101, which better protects the ultra-thin glass 101. The protective layer 105 fills the first fault layer 104, which can avoid rainbow patterns and reliability warping of the display panel 200 when cutting.

[0081] In some embodiments, Fig.14 The figure shows the structure of the cover plate 100' before cutting. The transparent optical adhesive layer 102 is OCR adhesive, and the protective layer 105 is OCR adhesive. The OCR adhesive fills the first fault layer 104 and covers the side of the ultra-thin glass 101 away from the transparent optical adhesive layer 102. The thickness of the protective layer 105 is greater than the thickness of the ultra-thin glass 101.

[0082] In this embodiment, the transparent optical adhesive layer 102 and the protective layer 105 are both OCR adhesives, and the OCR adhesive not only fills the first fault layer 104 but also covers the side of the ultra-thin glass 101 away from the transparent optical adhesive layer 102, so that the transparent optical adhesive layer 102 and the protective layer 105 fully wrap the ultra-thin glass 101, and better protect the ultra-thin glass 101 from damage. The transparent optical adhesive layer 102 and the protective layer 105 can be formed in one step, simplifying the manufacturing process of the cover plate 100. In addition, the transparent optical adhesive layer 102 and the protective layer 105 are made of the same material, which reduces the process of intermediate splicing and alignment, which can improve the preparation accuracy on the one hand and the production efficiency on the other hand.

[0083] like Figure 9-14 In the illustrated embodiment, the cover plate 100 further includes a first protective film 108 and a second protective film 109. The first protective film 108 covers the surface of the flexible film layer 103 away from the ultra-thin glass 101, and the second protective film 109 covers the surface of the ultra-thin glass 101 and / or the protective layer 105 away from the flexible film layer 103. The first protective film 108 and the second protective film 109 protect the surface of the cover plate 100 to prevent scratches.

[0084] Of course, for Figure 1-Figure 7In the illustrated embodiment, the cover plate 100 may also include a first protective film 108 and a second protective film 109 , which are configured as above and will not be described in detail herein.

[0085] In the above embodiments, Figure 1-Figure 7 , Figure 9-14 As shown, the light shielding area 1032 can be formed by coating a light shielding material on a side of the flexible film layer 103 close to the transparent optical adhesive layer 102 .

[0086] By coating the shading material on the side of the flexible film layer 103 close to the transparent optical adhesive layer 102 to form the shading area 1032, it is not necessary to perform regional manufacturing on the flexible film layer 103, thereby simplifying the manufacturing process of the flexible film layer 103. It is also convenient to control the range of the shading area 1032 by controlling the range of the coating area, which is simple and easy.

[0087] Optionally, the shading material may be, but is not limited to, ink 107. The ink 107 has a good shading effect and can prevent light leakage from the shading area 1032. The ink 107 can be formed on the flexible film layer 103 by coating, inkjet printing, etc., which is simple and easy to operate.

[0088] Specifically, the OD (Optical Density) value of the ink 107 may be greater than or equal to 2. The specific width of the ink 107 is determined according to the design of the product visual area (VA area).

[0089] The following specific embodiments are given to illustrate the present application in more detail.

[0090] Specific embodiment (I): Fig. 9 or Fig.10 As shown, the cover plate 100 glass consists of three layers, the first flexible film layer 103, the material is PET, the thickness is 75μm. The shading area 1032 of the flexible film layer 103 is also coated with shading ink 107, the ink 107OD>2, and the width is determined according to the design of the product VA area. The second layer is a transparent optical adhesive layer 102, specifically OCA adhesive, the material is acrylic, the tensile modulus at room temperature is 30Kpa, and the thickness is 35μm. The third layer is a combined film layer, the central area is ultra-thin glass 101, the thickness is 30μm, and the surrounding area is polymer, the material is PET, CPI, TPU and other optical film materials, the thickness of the polymer is consistent with the ultra-thin glass 101, and the polymer is filled in the first fault 104. The combination of the protective layer 105 and the ultra-thin glass 101 can be assembled by bonding. Considering the bonding tolerance and the material tolerance, the interval S between the two is designed to be 0.1mm-0.2mm.

[0091] The flexible film layer 103 is selected as PET, and the thickness is set to 75μm, and the thickness of the ultra-thin glass 101 is designed to be 30μm, and a polymer is filled in the first fault layer 104. The polymer is selected from optical film materials such as PET, CPI, TPU, etc., and the thickness is consistent with the ultra-thin glass 101, which is more conducive to regulating the thickness of the cover plate 100 within a suitable range and improving the impact resistance of the cover plate 100. The first fault layer 104 is filled with polymers such as PET, CPI or TPU, which effectively compensates for the step difference caused by the shrinkage of the ultra-thin glass 101. When cutting, the air layer will not be cut, so the display panel 200 can be prevented from having rainbow lines and poor appearance dents. The ink 107OD>2 can prevent the occurrence of edge light leakage. The second transparent optical adhesive layer 102 selects acrylic OCA glue, and the room temperature tensile modulus is designed to be 30Kpa, so that the second layer has good rigidity and good bendability, thereby improving the impact resistance of the cover plate 100. Furthermore, the thickness of the second layer is 35 μm, which is conducive to controlling the thickness of the cover plate 100 within a suitable range.

[0092] Specific embodiment (two): Fig.11 As shown, the cover glass 100 is composed of three layers. The first layer is a flexible film layer 103, made of CPI and 50μm thick. The shading area 1032 of the flexible film layer 103 is also coated with shading ink 107, and the ink 107OD>2, and the width is determined according to the design of the product VA area. The second layer is a transparent optical adhesive layer 102, specifically OCA adhesive, made of acrylic, with a tensile modulus of 35Kpa at room temperature and a thickness of 50μm. The third layer is a combined film layer, the central area is ultra-thin glass 101, with a thickness of 30μm, and the surrounding area is polymer, the material is one of PMMA, PU and other materials, the thickness of the polymer is consistent with the ultra-thin glass 101, and the polymer is filled in the first fault layer 104. The combination of the protective layer 105 and the ultra-thin glass 101 can be prepared by liquid coating and then solidification. The coating can be a needle or spray valve dispensing method, or an inkjet printing method, and then thermally solidified or UV cured. Here, an acrylic material with a viscosity of 100cps can be selected, and it can be made by spray valve printing and UV curing. The modulus after curing is about 3Gpa. In this way, the protective layer 105 can contact the edge of the ultra-thin glass 101 without generating a gap S.

[0093] The flexible film layer 103 is selected as CPI, and the thickness is set to 50μm, and the thickness of the ultra-thin glass 101 is designed to be 30μm, and a polymer is filled in the first fault layer 104. The polymer is selected from one of the materials such as PMMA and PU, and the thickness is consistent with the ultra-thin glass 101, which is more conducive to regulating the thickness of the cover plate 100 within a suitable range and improving the impact resistance of the cover plate 100. The first fault layer 104 is filled with polymers such as PMMA or PU, which effectively compensates for the step difference caused by the shrinkage of the ultra-thin glass 101. When cutting, the air layer will not be cut, so the display panel 200 can be prevented from having rainbow lines and poor appearance dents. PMMA and PU can be applied in a liquid coating manner, and can be in close contact with the ultra-thin glass 101, which is conducive to improving the coating accuracy. Ink 107OD>2 can prevent the occurrence of edge light leakage. The second transparent optical adhesive layer 102 is made of acrylic OCA adhesive, and the room temperature tensile modulus is designed to be 35Kpa, so that the second layer has good rigidity and good bendability, and improves the impact resistance of the cover plate 100. The thickness of the second layer is 50μm, which is conducive to controlling the thickness of the cover plate 100 within a suitable range and improving the impact resistance of the cover plate 100.

[0094] Specific embodiment (three): Fig.14 As shown, the cover glass 100 is composed of three layers. The first layer is a flexible film layer 103, which is made of TPU and has a thickness of 100μm. The shading area 1032 of the flexible film layer 103 is also coated with shading ink 107, and the ink 107OD>2, and the width is determined according to the design of the product VA area. The second layer is a transparent optical adhesive layer 102, specifically OCR glue, which covers the ultra-thin glass 101 on all sides and up and down. The material is acrylic, and the tensile modulus at room temperature is 30Kpa. The thickness of the OCR glue on the upper and lower sides of the ultra-thin glass 101 is 50μm. The third layer is ultra-thin glass 101 with a thickness of 30μm. The OCR glue is prepared by inkjet printing. In this way, the protective layer 105 can contact the edge of the ultra-thin glass 101 without generating a gap S.

[0095] The flexible film layer 103 is selected as TPU, and the thickness is set to 100μm, and the thickness of the ultra-thin glass 101 is designed to be 30μm, and the ultra-thin glass 101 is wrapped with OCR glue on all sides, and there is no need to fill the first fault layer 104 separately, which is conducive to simplifying the manufacturing process of the cover plate 100, and is conducive to regulating the thickness of the cover plate 100 within a suitable range, and improving the impact resistance of the cover plate 100. In addition, the OCR glue wraps the ultra-thin glass 101, effectively filling the step difference between the ultra-thin glass 101 and the flexible film layer 103. When cutting, there will be no phenomenon of cutting the air layer, so the display panel 200 can be prevented from having rainbow lines and poor appearance dents. The OCR glue can be prepared by inkjet printing, and can be in close contact with the ultra-thin glass 101, which is conducive to improving the coating accuracy. The thickness of the OCR glue on the upper and lower sides of the ultra-thin glass 101 is 50μm, which is conducive to controlling the thickness of the cover plate 100 within an appropriate range. The tensile modulus of the OCR glue at room temperature is designed to be 30Kpa, and the OCR glue fully wraps the ultra-thin glass 101, ensuring that the second layer has good rigidity while also having good bendability, thereby improving the impact resistance of the cover plate 100.

[0096] The OD of the ink 107 is greater than 2, which can prevent edge light leakage.

[0097] The second aspect of the present application provides a display device, which includes the above-mentioned cover plate 100. Therefore, the cover plate 100 of the display device has good integrity, and the ultra-thin glass 101 of the cover plate 100 is not prone to cracking.

[0098] The present application has no particular limitation on the type of display device, which may include but is not limited to: mobile phones, tablet computers, laptop computers, and televisions.

[0099] It can be understood that the display device also includes a display panel 200, and the cover plate 100 is covered on the top of the display panel 200. The display panel 200 includes a flexible substrate and a thin film transistor (TFT) circuit layer made on the flexible substrate, and a display layer made on the side of the circuit layer away from the flexible substrate. The display layer can be OLED or Micro LED. An encapsulation layer is made on the side of the display layer away from the flexible substrate. The encapsulation layer can be a three-layer composite structure of inorganic / organic / inorganic. Specifically, the three-layer composite structure of inorganic / organic / inorganic can be SiON, acrylic, and SiN, respectively. The screen integrated touch layer is made on the side of the encapsulation layer away from the flexible substrate.

[0100] Among them, the flexible substrate is preferably PI. In addition to OLED or Micro LED, the display layer may also include a protective film below the OLED or Micro LED and a polarizer or color film layer above the OLED or Micro LED.

[0101] A flexible support mechanism (BKT) 300 is attached below the display panel 200. The flexible support mechanism 300 may be stainless steel (SUS), titanium (Ti) alloy, aluminum (Al) alloy, or carbon fiber plate, etc. The cover plate 100 and the display panel 200 are bonded by a first adhesive layer 400, and the display panel 200 and the support mechanism 300 are bonded by a second adhesive layer 500. Both the first adhesive layer 400 and the second adhesive layer 500 are transparent adhesive layers, such as OCA adhesive or OCR adhesive.

[0102] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0103] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0104] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A cover plate, characterized in that: The cover plate comprises an ultra-thin glass, a transparent optical adhesive layer arranged on one side of the ultra-thin glass, and a flexible film layer arranged on a side of the transparent optical adhesive layer away from the ultra-thin glass; The flexible film layer comprises a light-transmitting area in the middle and a light-shielding area arranged around the light-transmitting area; The flexible film layer is flush with the outer boundary of the transparent optical adhesive layer, the outer boundary of the ultra-thin glass is retracted relative to the outer boundaries of the flexible film layer and the transparent optical adhesive layer to form a first fault, at least one of the upper surface, lower surface and side surface of the ultra-thin glass, and at least a portion close to the first fault is provided with a protective layer, and the width of the first fault is smaller than the width of the shading area.

2. The cover plate according to claim 1, characterized in that: The transparent optical adhesive layer is OCA adhesive, and the protective layer is thermal conductive adhesive; The thermally conductive adhesive wraps the upper surface and the side surface of the end of the ultra-thin glass close to the first fault; or, the thermally conductive adhesive wraps the lower surface and the side surface of the end of the ultra-thin glass close to the first fault; Alternatively, the thermally conductive adhesive wraps the upper surface, the lower surface and the side surface of the ultra-thin glass at one end close to the first fault.

3. The cover plate according to claim 2, characterized in that: The thermally conductive adhesive comprises resin and filler, and the filler is a thermally conductive and insulating material.

4. The cover plate according to claim 3, characterized in that: The filler is one of aluminum nitride, boron nitride, silicon nitride, aluminum oxide, magnesium oxide, and zinc oxide.

5. The cover plate according to any one of claims 1 to 4, characterized in that: The width of the first overlapping portion between the protective layer and the ultra-thin glass is less than or equal to the width of the shading area, and the thickness of the first overlapping portion is less than the thickness of the transparent optical adhesive layer; The width of the second overlapping portion between the protective layer and the first fault layer does not exceed the outer boundaries of the flexible film layer and the transparent optical adhesive layer.

6. The cover plate according to claim 5, characterized in that: The width of the first overlapping portion between the protective layer and the ultra-thin glass is less than or equal to 500 μm, and the thickness h1 of the first overlapping portion is less than or equal to 5 μm; A width of a second overlapping portion between the protection layer and the first fault layer is less than or equal to 50 μm.

7. The cover plate according to any one of claims 1 to 4, characterized in that: The thickness of the flexible film layer is 20 μm-200 μm, the thickness of the transparent optical adhesive layer is 10 μm-100 μm, and the thickness of the ultra-thin glass is 10 μm-100 μm.

8. The cover plate according to claim 1, characterized in that: The transparent optical adhesive layer is OCA adhesive, the protective layer is a polymer, the polymer fills the first fault layer and has the same thickness as the ultra-thin glass.

9. The cover plate according to claim 8, characterized in that: The polymer is polyimide, polyethylene terephthalate, thermoplastic polyurethane, polymethyl methacrylate or polyurethane.

10. The cover plate according to claim 1, characterized in that: The transparent optical adhesive layer is OCA adhesive, the protective layer is OCR adhesive, the OCR adhesive fills the first fault and covers the side of the ultra-thin glass away from the transparent optical adhesive layer, and the thickness of the protective layer is greater than the thickness of the ultra-thin glass.

11. The cover plate according to claim 1, characterized in that: The transparent optical adhesive layer is OCR adhesive, and the protective layer is OCR adhesive; The OCR glue fills the first fault layer, and the thickness of the OCR glue is the same as the thickness of the ultra-thin glass; or, the OCR glue fills the first fault layer and covers a side of the ultra-thin glass away from the transparent optical adhesive layer, and the thickness of the protective layer is greater than the thickness of the ultra-thin glass.

12. The cover plate according to any one of claims 1 to 4 and claims 8 to 11, characterized in that: A light shielding material is coated on a side of the flexible film layer close to the transparent optical adhesive layer to form the light shielding area.

13. A display device, characterized in that: The display device comprises the cover plate according to any one of claims 1 to 12.

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