Cover plate and display device

Abstract

The embodiment of the invention 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 technologies, and particularly to a cover plate and a display device. Background Art

[0002] Flexible display devices can be folded, curled, or bent, and have attracted consumers' attention due to their portability and convenience. However, the display panel of a flexible display device has insufficient strength. To improve the strength of the display panel, an ultra-thin glass cover plate is adhered to its surface. However, the ultra-thin glass cover plate cannot be laser cut, so a certain distance needs to be retracted during design, which results in an inevitable fault at the cutting line position due to the step difference caused by the retraction of the ultra-thin glass. During cutting, the ultra-thin glass is prone to cracking due to the influence of laser heat. Summary of the Invention

[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 prone to cracking during the cutting process. The specific technical solutions are as follows:

[0004] In a first aspect of the present application, a cover plate is provided. The cover plate includes an ultra-thin glass, a transparent optical adhesive layer provided on one side of the ultra-thin glass, and a flexible film layer provided on the side of the transparent optical adhesive layer away from the ultra-thin glass; the flexible film layer includes a light-transmitting area in the middle and a light-shielding area arranged around the light-transmitting area; the outer boundary of the flexible film layer is flush with the 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. At least one of the upper surface, lower surface, and side surface of the ultra-thin glass, and at least a part close to the first fault is provided with a protective layer, and the width of the first fault is less than the width of the light-shielding area.

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

[0006] In some embodiments, the transparent optical adhesive layer is an OCA adhesive, and the protective layer is a thermal conductive adhesive; the thermal conductive adhesive wraps the upper surface and side surface of one end of the ultra-thin glass close to the first fault; or, the thermal conductive adhesive wraps the lower surface and side surface of one end of the ultra-thin glass close to the first fault; or, the thermal 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 thermal conductive adhesive includes a resin and a filler, and the filler is a material with thermal conductivity and insulation.

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

[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 light-shielding region, 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 boundaries of the flexible film layer and the transparent optical adhesive layer.

[0010] 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 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 of 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 an OCA adhesive, the protective layer is a polymer, the polymer fills the first fault, 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 an OCA adhesive, the protective layer is an 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 an OCR adhesive, and the protective layer is an OCR adhesive; the OCR adhesive fills the first fault, 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 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 the side of the flexible film layer close to the transparent optical adhesive layer to form the light-shielding region.

[0017] The second aspect of the present application provides a display device, and the display device 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 embodiments 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 peripheral light-shielding area is used to prevent light leakage at the edges. Moreover, 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, and the outgoing light has to pass through three layers of films, namely the ultra-thin glass, the transparent optical adhesive layer and the flexible film layer, reducing the risk of uneven light emission at the edges. 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 within the first fault area. Therefore, the ultra-thin glass will not be cut during the cutting process, and thus 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 providing a protective layer on at least one of the upper surface, lower surface and side surface of the ultra-thin glass, and at least in part near the first fault, the protective layer can quickly dissipate the instantaneous heat of laser cutting, reduce the influence of the thermal stress on the ultra-thin glass, and thus play a role in protecting the ultra-thin glass and preventing the ultra-thin glass from cracking during the laser cutting process.

[0020] Of course, it is not necessary for any product or method implementing the present application to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other embodiments based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the cover plate provided by the embodiments of the present application in one embodiment, wherein the protective layer is provided on the upper surface of the ultra-thin glass near the first fault;

[0023] Figure 2 It is a schematic structural diagram of the cover plate before cutting provided by the embodiments of the present application in one embodiment, wherein the protective layer is provided on the upper surface of the ultra-thin glass near the first fault;

[0024] Figure 3 It is a schematic structural diagram of the cover plate before cutting provided by the embodiments of the present application in one embodiment, wherein the protective layer is provided on the lower surface of the ultra-thin glass near the first fault;

[0025] Figure 4 It is a schematic structural diagram of the cover plate before cutting provided by the embodiments of the present application in one embodiment, wherein the protective layer is provided on the side surface of the ultra-thin glass near the first fault;

[0026] Figure 5Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is provided on the upper surface and the side surface of the ultra-thin glass close to the first fault;

[0027] Figure 6 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is provided on the lower surface and the side surface of the ultra-thin glass close to the first fault;

[0028] Figure 7 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is provided on the upper surface, the lower surface and the side surface of the ultra-thin glass close to the first fault;

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

[0030] Figure 9 Schematic structural diagram of the cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is mounted in the first fault;

[0031] Figure 10 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is mounted in the first fault;

[0032] Figure 11 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer is coated in the first fault;

[0033] Figure 12 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the lower side of the protective layer semi-wraps the ultra-thin glass;

[0034] Figure 13 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer and the upper side of the transparent optical adhesive layer semi-wrap the ultra-thin glass;

[0035] Figure 14 Schematic structural diagram of the pre-cut cover plate provided by an embodiment of the present application in one embodiment, wherein the protective layer and the transparent optical adhesive layer fully wrap the ultra-thin glass.

[0036] The reference numerals are as follows: cover plate 100; pre-cut cover plate 100'; 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; support 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 implementation manners

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0038] In the first aspect of the embodiments of the present application, a cover plate 100 is provided, as Figure 1 shown in the structural schematic diagram of the cover plate 100. 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 outer boundary of 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. At least one of the upper surface, lower surface, and side surface of the ultra-thin glass 101, and at least a part close to the first fault 104 is provided with a protective layer 105, and the width A of the first fault is smaller than the width B of the light-shielding area.

[0039] To illustrate in detail the role of the first fault 104 during the cutting process, as Figures 2 - 7The figure shows a schematic diagram of the pre-cut front cover plate 100'. As can be seen from the figure, the width a of the first fault before cutting is smaller than the width b of the light-shielding area before cutting. Thus, after cutting along the cutting line 106, the width A of the first fault is smaller than the width B of the light-shielding area, further enabling the light-shielding area 1032 to cover a part of the ultra-thin glass 101, so that the outgoing light rays have to pass through three layers of film layers: the ultra-thin glass 101, the transparent optical adhesive layer 102, and the 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 pre-cut front cover plate 100' to the cutting line 106, making the cutting position of the cutting line 106 within the first fault area 104. Therefore, the ultra-thin glass 101 will not be cut during the cutting process, thus avoiding the breakage of the ultra-thin glass 101 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 peripheral light-shielding area 1032 is used to prevent light leakage at the edge. And the width B of the light-shielding area is greater than the width A of the first fault, enabling the light-shielding area 1032 to cover a part of the ultra-thin glass 101, so that the outgoing light rays have to pass through three layers of film layers: the ultra-thin glass 101, the transparent optical adhesive layer 102, and the flexible film layer 103, 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 in the part close to the first fault 104, the protective layer 105 can quickly dissipate the instantaneous heat of laser cutting, reducing the influence caused by the thermal stress on the ultra-thin glass 101, thus playing a role in protecting the ultra-thin glass 101 and avoiding the breakage of the ultra-thin glass 101 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 means that a protective layer 105 is provided on one surface of the ultra-thin glass 101, such as the upper surface, lower surface, or side surface, as shown in 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, as shown in Figure 5 and Figure 6 ; or three surfaces of the ultra-thin glass 101, that is, the upper surface, lower surface, and side surface are all provided with a protective layer 105, as shown in Figure 7As shown. And at least the part close to the first fault 104 is covered with a protective layer 105. The protective layer 105 can be provided only at the position close to the first fault 104, or the protective layer 105 can 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. The present application does not limit this.

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

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

[0044] According to the different materials selected for the flexible film layer 103, its thickness is also different. Similarly, for the transparent optical adhesive layer 102, different materials result in different thicknesses. And the ultra-thin glass 101 is appropriately adjusted according to the thicknesses of 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 requirements 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 a 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, indicating that the stiffness of the display cover plate 100 is too small to improve the impact resistance of the display cover plate 100. If 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 does not increase significantly, and it is not conducive to the bending of the cover plate 100. Therefore, by controlling the tensile modulus of the material of the second layer at room temperature to be < 100 Kpa, the stiffness of the cover plate 100 can be increased while facilitating 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, reducing the risk of damage when subjected to external impact, reducing the risk of problems such as broken bright spots or encapsulation cracks in the display device, and extending the service life of the display device.

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

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

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

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

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

[0051] Optionally, as Figure 7 shown, in some embodiments, the transparent optical adhesive layer 102 is an OCA adhesive, and the protective layer 105 is a thermal conductive adhesive. The thermal conductive adhesive wraps the upper surface, the lower surface and the side surface of one end of the ultra-thin glass 101 close to the first fault 104.

[0052] In this embodiment, the thermal conductive adhesive completely wraps one end of the ultra-thin glass 101 close to the first fault 104, better blocking the propagation of laser heat to the surface of the ultra-thin glass 101, thereby better protecting the ultra-thin glass 101 from the influence of thermal stress and preventing the ultra-thin glass 101 from cracking during laser cutting.

[0053] In some embodiments, the thermal conductive adhesive includes a resin and a filler, and the filler is a material with thermal conductivity and insulation.

[0054] The resin serves as the matrix material of the thermal conductive adhesive and mainly plays a role in curing. 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 a resin and a filler, enabling the thermal conductive adhesive to not only adhere well to the surface of the ultra-thin glass 101 but also have good heat dissipation ability.

[0055] Optionally, the filler is one or a mixture of 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 a physical mixture and there is no reaction between them.

[0056] Among them, the design of the width A of the first fault, that is, the amount of inward shrinkage, needs to consider 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 effective display area (Active Area, AA area) a2 of the display panel 200, the alignment accuracy a3 of laser cutting, and the length d of the heat affected zone of laser cutting. Generally, the inward shrinkage amount 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, that is For product requirements, the smaller the inward shrinkage amount of the ultra-thin glass 101, the better, which can improve the edge support strength at the existing level. In the embodiment of the present application, due to the setting of the protective layer 105, the inward shrinkage amount is the square root of the sum of the squares of a1, a2, and a3, that is The influence of the heat-affected zone can be ignored, which is beneficial to reducing the value of the shrinkage amount of the ultra-thin glass 101.

[0057] As Figures 1 - 7 In the embodiment shown, the protective layer 105 covers one end of the ultra-thin glass 101 close to the first fault 104. The width d1 of the first overlapping part of the protective layer 105 and the ultra-thin glass 101 is less than or equal to the width of the light-shielding area, and the thickness h1 of the first overlapping part is less than the thickness of the transparent optical adhesive layer 102; the width d2 of the second overlapping part of the protective layer 105 and the first fault 104 does not exceed the outer boundaries of the flexible film layer 103 and the transparent optical adhesive layer 102.

[0058] In Figures 1 - 7 In the embodiment shown, the main function of the protective layer 105 is to protect the ultra-thin glass 101 and reduce the influence of the heat during laser cutting on the ultra-thin glass 101, thereby avoiding the ultra-thin glass 101 from cracking. The side of the ultra-thin glass 101 close to the first fault 104 is the area closer to the cutting line position and is most vulnerable to the influence of laser heat. Therefore, setting 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 role of the protective layer 105. As shown in combination with Figure 8 As shown, the width d1 of the first overlapping part of the protective layer 105 and the ultra-thin glass 101 is less than or equal to the width of the light-shielding area, making the periphery of the cover plate 100 all show graphite black, ensuring the appearance consistency. The thickness h1 of the first overlapping part is less than the thickness of the transparent optical adhesive layer 102, so that while the protective layer 105 protects the ultra-thin glass 101, it does not increase the thickness of the cover plate 100, which is beneficial to the thinness and lightness of the cover plate 100. The width d2 of the second overlapping part of the protective layer 105 and the first fault 104 does not exceed the outer boundaries 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 during 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 protecting the ultra-thin glass 101 from the influence of thermal stress and avoiding the ultra-thin glass 101 from cracking during laser cutting.

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

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

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

[0062] The second overlapping portion of the protective layer 105 and the first fault 104, that is, the portion where the protective layer 105 covers one side of the side surface of the ultra-thin glass 101. The second overlapping portion is the part closest to the heat-affected zone of the laser energy, and the thickness of this part can effectively absorb the instantaneous heat generated by laser cutting. The width d2 of the second overlapping portion ≤ 50 μm, which can not only effectively absorb the instantaneous heat generated by laser cutting but also be beneficial to saving the material of the thermal conductive adhesive.

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

[0064] In some embodiments, as Figures 9 - 11 shown, wherein Figure 9 is a schematic structural diagram of the cover plate 100, Figure 10 、 Figure 11 is a schematic structural diagram of the cover plate 100' before cutting. The transparent optical adhesive layer 102 is an OCA adhesive, and the protective layer 105 is a polymer. The polymer fills the first fault 104 and has the same thickness as the ultra-thin glass 101.

[0065] In this embodiment, the polymer fills the air layer caused by the shrinkage of the ultra-thin glass 101 between the ultra-thin glass 101, the transparent optical adhesive layer 102, and the flexible film layer 103. Therefore, during laser cutting, the protective layer 105 will be cut, which can reduce the risk of directly cutting into 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, both the upper and lower surfaces of the ultra-thin glass 101 are bonded with OCA adhesive, and the upper flexible film layer 103 has a tendency to be pulled downward. If the first fault 104 is not filled solidly, it is easy to deform under force and form an appearance dent. Therefore, filling the first end fault with the polymer can also improve the problem that dents are likely to appear on the 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, as Figure 9 , Figure 10 shown, polyimide, polyethylene terephthalate, and thermoplastic polyurethane are film materials and can be mounted in the first fault 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 0.1 mm - 0.2 mm.

[0069] As Figure 11 shown is a schematic structural diagram of the front cover plate 100' before cutting. Polymethyl methacrylate and polyurethane are liquid coating materials and can be coated on 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 the protective layer 105. The coating can be in the form of dispensing with a needle or a spray valve head, or in the form of inkjet printing, and then thermally cured or UV (ultraviolet) cured. Here, polymethyl methacrylate material with a viscosity of 100 cps can be selected and fabricated by spray valve printing and UV curing methods. After curing, the modulus is about 3 GPa. The polymer formed by this coating method can be in contact with the edge of the ultra-thin glass 101 without generating an interval S, which is beneficial to improving the processing accuracy.

[0070] Specifically, polyimide, an organic polymer material, has excellent high-temperature resistance, and the heat-resistant temperature can reach above 400 °C. Therefore, as a filling material for the first fault 104, it is not easily deformed by heat and can play a good supporting role.

[0071] Polyethylene terephthalate, a high molecular compound, has excellent physical and mechanical properties in a relatively wide temperature range. The service temperature can reach 120 °C, and it has good creep resistance, fatigue resistance, friction resistance, and dimensional stability. Therefore, as a filling material for the first fault 104, it is not easily deformed by heat and can play a good supporting role, avoiding the problems of rainbow patterns and reliability warping of the display panel 200 during the cutting process.

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

[0073] Polymethyl methacrylate, a kind of polymer, also known as acrylic or plexiglass, has the advantages of high transparency, low price, and easy machining. The mechanical strength of polymethyl methacrylate is relatively high, and its toughness is good, not easy to break. Therefore, when filled in the first fault 104, it can effectively improve the supporting strength at the first fault 104, making the upper flexible film layer 103 not easy to deform during the cutting process. And because of its good toughness, there are fewer debris during the cutting process, preventing the debris from entering the display panel 200 and causing defects in the display panel 200.

[0074] Polyurethane is a kind of polymer material with good flexibility and elasticity. When filled in the first fault 104, it can play a good supporting role, avoiding the problems of rainbow patterns and reliability warping of the display panel 200 during the cutting process.

[0075] In some embodiments, as Figure 12 shown in the structural schematic diagram of the front 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 104 and covers one 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] The OCR adhesive is a liquid optical adhesive and can be prepared by inkjet printing. Therefore, it can be in close contact with the ultra-thin glass 101, making the OCR adhesive not only fill the first fault 104 but also cover one side of the ultra-thin glass 101 away from the OCA adhesive, forming a semi-wrapping form for the ultra-thin glass 101. The OCR adhesive is in close contact with the edge of the ultra-thin glass 101, and the OCR adhesive can also play a role in fixing the ultra-thin glass 101.

[0077] After curing, the OCR adhesive is colorless and transparent, with a light transmittance of more than 98%, having little impact on the light transmittance of the display panel 200. Therefore, the OCR adhesive can be filled in the light-transmitting area 1031, thus forming a semi-wrapping form for the ultra-thin glass 101 and better playing the role of protecting the ultra-thin glass 101. And the protective layer 105 fills the first fault 104, which can avoid the rainbow patterns and reliability warping of the display panel 200 during cutting.

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

[0079] In some embodiments, as Figure 13 shown in the schematic structural diagram of the front 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 104, and the thickness of the OCR adhesive is the same as that of the ultra-thin glass 101.

[0080] Both the transparent optical adhesive layer 102 and the protective layer 105 are OCR adhesives, so the two 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-wrapping form for the ultra-thin glass 101, better protecting the ultra-thin glass 101. And the protective layer 105 fills the first fault 104, which can avoid the rainbow pattern and reliability warping of the display panel 200 during cutting.

[0081] In some embodiments, as Figure 14 shown in the schematic structural diagram of the front 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 104, and covers one side of the ultra-thin glass 101 away from the transparent optical adhesive layer 102, and the thickness of the protective layer 105 is greater than that of the ultra-thin glass 101.

[0082] In this embodiment, both the transparent optical adhesive layer 102 and the protective layer 105 are OCR adhesives, and the OCR adhesive not only fills the first fault 104 but also covers one 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, better protecting the ultra-thin glass 101 from damage. The transparent optical adhesive layer 102 and the protective layer 105 can be completed by one-step forming, simplifying the manufacturing process of the cover plate 100. And the transparent optical adhesive layer 102 and the protective layer 105 are made of the same material, reducing the process of intermediate splicing and alignment. On the one hand, it can improve the preparation accuracy, and on the other hand, it can also improve the manufacturing efficiency.

[0083] As Figures 9 - 14 shown in the 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 on the side 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 on the side 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 scratching.

[0084] Of course, for Figures 1 - 7In the illustrated embodiment, the cover plate 100 may also include a first protective film 108 and a second protective film 109, which are arranged in the same manner as above and will not be elaborated here.

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

[0086] By coating a light-shielding material on the side of the flexible film layer 103 close to the transparent optical adhesive layer 102 to form the light-shielding region 1032, there is no need to perform regional manufacturing on the flexible film layer 103, which simplifies the manufacturing process of the flexible film layer 103. Moreover, it is convenient to control the range of the light-shielding region 1032 by controlling the range of the coating area, which is simple and feasible.

[0087] Optionally, the light-shielding material may be, but is not limited to, the ink 107. The ink 107 has a good light-shielding effect and can prevent light leakage in the light-shielding region 1032. Moreover, the ink 107 can be formed on the flexible film layer 103 by means such as coating and inkjet printing, and the method 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's visual area (VA area).

[0089] The following gives specific embodiments to illustrate the present application more specifically.

[0090] Specific Embodiment (1): As Figure 9 or Figure 10 shown, the cover plate 100 glass is composed of three layers. The first layer is the flexible film layer 103, the material is PET, and the thickness is 75 μm. The light-shielding region 1032 of the flexible film layer 103 is also coated with the light-shielding ink 107, the OD of the ink 107 > 2, and the width is determined according to the design of the product's VA area. The second layer is the transparent optical adhesive layer 102, specifically the OCA adhesive, the material is acrylic-based, the room temperature tensile modulus is 30 Kpa, and the thickness is 35 μm. The third layer is the composite film layer. The central region is the ultra-thin glass 101, the thickness is 30 μm, and the surrounding is the polymer, the materials are optical film materials such as PET, CPI, and TPU. The thickness of the polymer is the same as that of 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 a bonding method. Considering the bonding tolerance and the incoming material tolerance, the interval S between the two is designed to be 0.1 mm - 0.2 mm.

[0091] The flexible film layer 103 is selected as PET, and its thickness is set to 75 μm. The thickness of the ultra-thin glass 101 is designed to be 30 μm. The first fault 104 is filled with a polymer, and the polymer is selected from optical film materials such as PET, CPI, and TPU. The thickness is the same as that of the ultra-thin glass 101, which is more conducive to adjusting the thickness of the cover plate 100 within a suitable range and improving the impact resistance of the cover plate 100. Filling the first fault 104 with polymers such as PET, CPI, or TPU effectively compensates for the step difference caused by the shrinkage of the ultra-thin glass 101. During cutting, there will be no phenomenon of cutting the air layer, so it is possible to avoid defects such as rainbow patterns and appearance dents on the display panel 200. The ink 107 has an OD > 2, which can prevent the occurrence of edge light leakage. The second transparent optical adhesive layer 102 is selected as an acrylic-based OCA adhesive, and the room temperature tensile modulus is designed to be 30 Kpa, so that the second layer has good stiffness while having good bendability, improving the impact resistance of the cover plate 100. And the thickness of the second layer is 35 μm, which is conducive to adjusting the thickness of the cover plate 100 within a suitable range.

[0092] Specific Embodiment (2): As Figure 11 shown, the cover plate 100 glass is composed of three layers. The first layer is the flexible film layer 103, the material is CPI, and the thickness is 50 μm. The light-shielding area 1032 of the flexible film layer 103 is also coated with light-shielding ink 107, and the ink 107 has an OD > 2, and the width is determined according to the design of the VA area of the product. The second layer is the transparent optical adhesive layer 102, specifically an OCA adhesive, the material is acrylic-based, the room temperature tensile modulus is 35 Kpa, and the thickness is 50 μm. The third layer is a composite film layer. The central area is the ultra-thin glass 101 with a thickness of 30 μm, and the surrounding is a polymer, and the material is one of materials such as PMMA and PU. The thickness of the polymer is the same as that of 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 prepared by a liquid coating and then curing method. The coating can be a needle or spray valve dispensing method, or an inkjet printing method, and then heat curing or UV curing. Here, an acrylic material with a viscosity of 100 cps can be selected and made by a spray valve printing and UV curing method. After curing, the modulus is about 3 Gpa. In this way, the protective layer 105 can be in contact with the edge of the ultra-thin glass 101 without generating a gap S.

[0093] The flexible film layer 103 is selected as CPI, and its thickness is set to 50 μm. The thickness of the ultra-thin glass 101 is designed to be 30 μm, and the polymer is filled in the first fault 104. One of the materials such as PMMA and PU is selected for the polymer, and its thickness is the same as that of the ultra-thin glass 101, which is more conducive to controlling the thickness of the cover plate 100 within a suitable range and improving the impact resistance of the cover plate 100. Filling PMMA or other polymers such as PU in the first fault 104 effectively makes up for the step difference caused by the shrinkage of the ultra-thin glass 101. During cutting, the phenomenon of cutting the air layer will not occur, so the display panel 200 can be prevented from having defects such as rainbow patterns and appearance dents. Moreover, 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 beneficial to improving the coating accuracy. The ink 107 has an OD > 2, which can prevent the occurrence of edge light leakage. The second transparent optical adhesive layer 102 is selected as an acrylic-based OCA adhesive, and the room temperature tensile modulus is designed to be 35 Kpa, so that the second layer has good stiffness and good bendability while improving the impact resistance of the cover plate 100. Moreover, the thickness of the second layer is 50 μm, 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 (3): As Figure 14 shown, the cover plate 100 glass is composed of three layers. The first layer is the flexible film layer 103, the material of which is TPU, and the thickness is 100 μm. The light-shielding area 1032 of the flexible film layer 103 is also coated with the light-shielding ink 107, and the ink 107 has an OD > 2, and the width is determined according to the design of the VA area of the product. The second layer is the transparent optical adhesive layer 102, specifically OCR adhesive, which wraps around the ultra-thin glass 101 on all sides, up and down. The material is acrylic-based, and the room temperature tensile modulus is 30 Kpa. The thickness of the OCR adhesive on both the upper and lower sides of the ultra-thin glass 101 is 50 μm. The third layer is the ultra-thin glass 101, with a thickness of 30 μm. The OCR adhesive is prepared by inkjet printing. In this way, the protective layer 105 can be in contact with the edge of the ultra-thin glass 101 without generating a gap S.

[0095] The flexible film layer 103 is selected as TPU and its thickness is set to 100 μm. The thickness of the ultra-thin glass 101 is designed to be 30 μm, and the periphery of the ultra-thin glass 101 is wrapped by OCR glue, eliminating the need to separately fill the first fault 104. This simplifies the manufacturing process of the cover plate 100, helps control the thickness of the cover plate 100 within an appropriate range, and improves the impact resistance of the cover plate 100. Additionally, 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. During cutting, there will be no phenomenon of cutting the air layer, thus avoiding problems such as rainbow patterns and appearance dents on the display panel 200. The OCR glue can be prepared by inkjet printing, enabling it to closely contact the ultra-thin glass 101 and facilitating the improvement of coating accuracy. The thickness of the OCR glue on both the upper and lower sides of the ultra-thin glass 101 is 50 μm, which helps control the thickness of the cover plate 100 within an appropriate range. The room temperature tensile modulus of the OCR glue is designed to be 30 Kpa, and the OCR glue fully wraps the ultra-thin glass 101, ensuring good stiffness of the second layer while also having good bendability and improving the impact resistance of the cover plate 100.

[0096] The OD of the ink 107 > 2, which can prevent the occurrence of edge light leakage.

[0097] In the second aspect of the present application, a display device is provided, and the display device includes the cover plate 100 described above. 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 problems such as cracking defects.

[0098] The present application does not particularly limit the type of the 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 further includes a display panel 200. The cover plate 100 is covered above the display panel 200. The display panel 200 includes a flexible substrate, a thin film transistor (TFT) circuit layer fabricated above the flexible substrate, and a display layer fabricated on the side of the circuit layer away from the flexible substrate. The display layer can be an OLED or a Micro LED. An encapsulation layer is fabricated on the side of the display layer away from the flexible substrate, and 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. A screen integrated touch control layer is fabricated on the side of the encapsulation layer away from the flexible substrate.

[0100] Among them, the flexible substrate is preferably PI. In addition to including 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 to the lower side of the display panel 200. The flexible support mechanism 300 can be made of stainless steel (SUS), titanium (Ti) alloy, aluminum (Al) alloy, carbon fiber board, or the like. The cover plate 100 and the display panel 200 are bonded through a first adhesive layer 400, and the display panel 200 and the support mechanism 300 are bonded through 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 are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0103] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized.

[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 includes an ultra-thin glass, a transparent optical adhesive layer disposed on one side of the ultra-thin glass, and a flexible film layer disposed on the side of the transparent optical adhesive layer away from the ultra-thin glass; The flexible film layer includes a light-transmitting area in the middle and a light-shielding area disposed around the light-transmitting area; The outer boundary of 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 near the first fault is provided with a protective layer. The width of the first fault is smaller than the width of the light-shielding area.

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

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

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

5. The cover plate according to any one of claims 1-4, characterized in that, 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 light-shielding 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 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 of 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; The width of the second overlapping portion of the protective layer and the first fault is less than or equal to 50 μm.

7. The cover plate according to any one of claims 1-4, 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, wherein The transparent optical adhesive layer is an OCA adhesive, the protective layer is a polymer, the polymer fills the first fault, and has the same thickness as the ultra-thin glass.

9. The cover plate according to claim 8, wherein 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 an OCA adhesive, the protective layer is an 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. The thickness of the protective layer is greater than the thickness of the ultra-thin glass.

11. The cover plate according to claim 1, wherein, The transparent optical adhesive layer is an OCR adhesive, and the protective layer is an OCR adhesive; The OCR adhesive fills the first fault, 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 and covers the side of the ultra-thin glass away from the transparent optical adhesive layer. 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 1-4 and claims 8-11, 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 region.

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

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