WO2021136079A1 - Curved glass cover plate and preparation method therefor and terminal - Google Patents

Abstract

A curved glass cover plate (100) comprising a curved glass substrate (10), and an inorganic film layer (20) arranged on the curved glass substrate (10), wherein the inorganic film layer (20) comprises a light-transmissive color film layer (21) and a light-shielding film layer (22), the light-transmissive color film layer (21) is made of at least one of an inorganic oxide and a metal elementary substance, and the light-transmissive color film layer (21) and the light-shielding film layer (22) are laminated on one side surface of the curved glass substrate (10) or arranged on opposite side surfaces of the curved glass substrate (10) respectively. The inorganic film layer (20) is uniform in color and good in terms of decorative effect, and preparation of the inorganic film layer is not limited by bending angle, and is green and environmentally friendly. Further provided are a preparation method for the curved glass cover plate (100) and a terminal comprising the curved glass cover plate (100).

Description

Curved glass cover plate and preparation method and terminal thereof

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on December 30, 2019, the application number is 201911400227.4, and the application name is "curved glass cover plate and its preparation method and terminal", the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the technical field of electronic products, in particular to a curved glass cover plate, a preparation method thereof, and a terminal.

Background technique

Curved electronic products are favored by consumers due to their special structural design. In order to enhance the aesthetics, the industry usually decorates the curved cover of curved electronic products with silk-screen printing ink. However, due to the significant problem of uneven ink on the curved surface, the color of the ink layer after molding is uneven, and the decoration effect is not good, which affects the product yield; and when the curved surface is bent at a large angle, the ink decoration is difficult. When the curved surface is bent> At 90°, decoration is basically impossible. In addition, the organic matter in the ink produces a pungent odor during the curing process, which is not conducive to environmental protection. Therefore, it is necessary to find a green and environmentally friendly curved surface cover decoration scheme with good decorative effect, not limited by the bending angle.

Summary of the invention

In view of this, the present application provides a curved glass cover plate, which is decorated by arranging an inorganic film layer on the curved glass substrate. The inorganic film layer has a uniform color effect, is not limited by the bending angle, and is green and environmentally friendly. To a certain extent, it solves the problems of poor decorative effect of the existing ink decorative curved surface cover, limited by the bending angle, and not conducive to environmental protection.

Specifically, in the first aspect, the present application provides a curved glass cover plate, including a curved glass substrate, and an inorganic film layer disposed on the curved glass substrate, and the inorganic film layer includes a light-transmissive color film layer and A light-shielding film layer, the material of the light-transmissive color film layer includes at least one of inorganic oxide and simple metal, and the light-transmissive color film layer and the light-shielding film layer are laminated on the curved glass substrate. One side surface or are respectively arranged on the opposite side surfaces of the curved glass substrate.

In the embodiment of the application, the inorganic oxide includes one or more of silicon dioxide, niobium pentoxide, titanium pentoxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, tantalum pentoxide, and magnesium oxide. Kind.

In the embodiment of the present application, the metal element includes one or more of aluminum, titanium, silver, and germanium.

In the embodiment of the present application, the light-permeable color film layer includes an inorganic oxide film layer and a metal element film layer laminated and arranged on the curved glass substrate in sequence. Among them, the inorganic oxide film layer can achieve selective reflection of light of different wavelengths through the stacking design of the film layer thickness, thus forming different color effects, and the metal element film layer has a special metallic luster and reflection effect, which is The arrangement on the inorganic oxide film layer can enhance the color expressiveness of the light-permeable color film layer and improve the appearance effect of the curved glass cover plate.

In the embodiment of the present application, the light-permeable color film layer has a single-layer or multi-layer stacked structure.

In the embodiment of the present application, the visible light transmittance of the light-permeable color film layer is greater than 70%.

In the embodiment of the present application, the material of the light-shielding film layer includes one or more of silicon, silicon carbide, aluminum titanium nitride, and hydrogen-containing diamond-like carbon. Further, the optical density value of the light-shielding film layer is 2-5.

In the embodiment of the present application, the light-shielding film layer has a single-layer or multi-layer stacked structure.

In the embodiment of the present application, the thermal deformation temperature of the inorganic film layer is greater than 500°C. In the present application, the high thermal deformation temperature of the inorganic film layer is beneficial to ensure the integrity of the inorganic film layer structure and the bonding force between the inorganic film layer and the glass substrate during the preparation process of the curved glass cover plate.

In the embodiment of the present application, the thickness of the inorganic film layer is 50 nm-2000 nm. The inorganic film layer of suitable thickness can form a strong bonding force with the curved glass substrate without falling off, and at the same time, it can make the curved glass cover plate present a better appearance effect.

In the embodiment of the present application, the thickness ratio of the light-permeable color film layer and the light-shielding film layer is 1:(1-10). Further, the thickness ratio of the light-permeable color film layer and the light-shielding film layer is 1:(1-9).

In the embodiment of the present application, when the light-permeable color film layer and the light-shielding film layer are stacked on one side surface of the curved glass substrate, the light-permeable color film layer is located between the curved glass substrate and the curved glass substrate. Between the light-shielding film layers, or the light-shielding film layer is located between the curved glass substrate and the light-transmissive color film layer.

In the embodiment of the present application, when the light-permeable color film layer is the outermost structure of the curved glass cover, the surface of the light-permeable color film layer away from the curved glass substrate is provided with protection Floor.

In the embodiment of the present application, the thickness of the curved glass substrate is 0.1 mm-10 mm.

In the embodiment of the present application, the bending angle of the curved glass cover plate is 10°-180°. In this application, the combination of the inorganic film layer and the curved glass substrate is strong, and a curved glass cover with a larger bending angle can be produced, which expands the application range of the curved glass cover.

In the embodiment of the present application, the optical density value of the curved glass cover plate is 2-5.

In the embodiment of the present application, the curved glass substrate is a curved tempered glass substrate, which further improves the hardness and impact resistance of the curved glass cover.

The curved glass cover provided by the first aspect of the present application is decorated by arranging an inorganic film layer on the curved glass substrate. The inorganic film layer includes a light-transmitting color film layer and a light-shielding film layer, wherein the light-transmitting color film layer has a uniform color, The color effect is good, the light-permeable color film layer and the light-shielding film layer can be well combined with the curved glass substrate without being limited by the bending angle, which is beneficial to the preparation of curved glass cover plates with various bending angles, and the inorganic film layer avoids The use of organic substances is green and environmentally friendly.

In the second aspect, this application provides a method for preparing a curved glass cover plate, including:

Provide a flat glass substrate, deposit a light-permeable color film layer and a light-shielding film layer on the flat glass substrate to obtain a flat glass cover plate, the light-permeable color film layer and the light-shielding film layer are laminated on the flat glass One side surface of the substrate or respectively deposited on two opposite sides of the flat glass substrate, and the material of the transparent color film layer includes at least one of inorganic oxide and simple metal;

The flat glass cover plate is thermally bent to obtain a curved glass cover plate.

In the embodiment of the present application, the hot bending includes:

The flat glass cover plate is fixed in a hot bending forming mold and maintained at 500° C. to 900° C. and 0.05 MPa to 0.8 MPa for 30 s to 200 s, wherein the hot bending forming mold includes a concave mold and a convex mold.

In the embodiment of the present application, during the hot bending process, a pressure of 0.05 MPa-0.8 MPa is applied to the punch.

In the embodiment of the present application, during the hot bending process, a pressure of 0.01 MPa-0.2 MPa is applied to the convex mold, and a vacuum suction pressure of 0.04 MPa-0.6 MPa is applied to the concave mold at the same time. By applying pressure on both sides of the flat glass cover, both sides are under pressure, and the pressure on both sides is smaller than that on only one side, and the force is more dispersed, which is more conducive to the overall structure of the glass and the inorganic film. protection of. In addition, pressure on both sides can make the glass cover plate achieve the required bending effect at a relatively low temperature, which is also more conducive to protecting the film layer structure.

In the embodiment of the present application, the preparation method further includes: performing a tempering treatment on the curved glass cover plate after the hot bending treatment.

In the embodiment of the present application, the tempering treatment includes placing the curved glass cover plate in a molten salt liquid at 300°C-500°C for 0.5h-10h. In this application, the glass substrate is decorated by selecting the inorganic film layer of a specific material, while controlling the thickness of the film layer in a suitable range, and tempering can be realized after the hot bending treatment, so that a compressive stress layer is formed on the surface of the glass and the strength of the glass is improved.

In the embodiment of the present application, when the thickness difference between the film layers on both sides of the curved glass substrate is less than 500nm, the tempering treatment time is controlled to be 0.5h-5h; when the thickness difference between the film layers on both sides of the curved glass substrate is 500nm-1000nm When the time, the tempering treatment time is controlled to be 2h-8h; when the thickness difference between the film layers on both sides of the curved glass substrate is greater than 1000nm, the tempering treatment time is controlled to be 4h-10h.

In the method for preparing a curved glass cover provided by the second aspect of the application, the hot bending operation is performed after the light-transmitting color film layer and the light-shielding film layer are deposited. The film deposition is not limited by the bending angle, and the obtained film is uniform Good performance, strong bonding force with the flat glass substrate, good heat resistance, no peeling or cracking during hot bending, at the same time, the decoration effect is achieved by only setting the inorganic film layer, avoiding the use of organic substances, and being environmentally friendly.

In a third aspect, the present application also provides a terminal, which includes the curved glass cover manufactured by the manufacturing method described in the first aspect or the second aspect of the present application.

In the embodiment of the present application, the curved glass cover plate can be used as any one or more of the front cover, the back cover, and the middle frame of the terminal, so that the terminal obtains a curved effect and a rich color appearance, thereby enhancing the appearance of the terminal.

Description of the drawings

FIG. 1 is a schematic structural diagram of a curved glass cover provided by an embodiment of the application;

2 is a schematic structural diagram of a curved glass cover provided by another embodiment of the application;

3 is a schematic structural diagram of a curved glass cover provided by another embodiment of the application;

4 is a flow chart of the preparation of the curved glass cover provided by an embodiment of the application;

FIG. 5 is a schematic structural diagram of a terminal provided by an embodiment of this application.

Detailed ways

The technical solution of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

Please refer to FIG. 1, which is a schematic structural diagram of a curved glass cover plate provided by an embodiment of this application. The curved glass cover plate 100 includes a curved glass substrate 10, and an inorganic film layer 20 disposed on the curved glass substrate 10, and the inorganic film layer 20 It includes a light-permeable color film layer 21 and a light-shielding film layer 22. The material of the light-permeable color film layer 21 includes at least one of an inorganic oxide and a metal element. The curved glass cover plate can be applied to a terminal, and the curved glass substrate includes an appearance surface and an inner side surface that are arranged oppositely, wherein the appearance surface refers to a side surface facing the outside of the terminal, and the inner side surface refers to a side surface facing the inside of the terminal.

In the embodiment of the present application, the light-permeable color film layer 21 and the light-shielding film layer 22 may be laminated on one side surface of the curved glass substrate 10, or may be installed on opposite sides of the curved glass substrate 10, respectively.

In one embodiment of the present application, as shown in FIG. 1, the light-permeable color film layer 21 and the light-shielding film layer 22 are stacked on the same side surface of the curved glass substrate 10. Specifically, the light-permeable color film layer 21 may be provided. On the inner side of the curved glass substrate 10, the light-shielding film layer 22 is disposed on the surface of the light-transmissive color film layer 21. At this time, the color of the transparent color film layer 21 through the glass substrate 10 can be seen from the appearance side of the curved glass substrate 10, and due to the shielding effect of the light shielding film layer 22, the color of the transparent color film layer 21 can be seen More prominent. In this embodiment, the inorganic film layer 20 is located on the inner side of the glass substrate 10 and can be protected from the external environment, external forces, and the like.

In another embodiment of the present application, as shown in FIG. 2, the light-permeable color film layer 21 and the light-shielding film layer 22 are arranged on the same side surface of the curved glass substrate 10. Specifically, the light-shielding film layer 22 may be arranged on the curved glass substrate 10. On the appearance surface of the substrate 10, the light-transmissive color film layer 21 is disposed on the light-shielding film layer 22.

In yet another embodiment of the present application, as shown in FIG. 3, the light-transmissive color film layer 21 and the light-shielding film layer 22 are respectively disposed on opposite sides of the curved glass substrate 10. Specifically, the light-transmissive color film layer 21 is provided On the exterior surface of the glass substrate 10, a light-shielding film layer is provided on the inner surface of the glass substrate 10. At this time, the color of the light-permeable color film layer 21 can be seen on the side of the appearance surface, and the color of the light-permeable color film layer 21 is more prominent due to the shielding effect of the light-shielding film layer 22.

The curved glass cover 100 provided by the present application is decorated by arranging an inorganic film layer 20 on the curved glass substrate 10, wherein the light-permeable color film layer 21 can present a uniform color and good appearance effect, and the light-shielding film layer 22 can perform The function of shielding the internal structure of the terminal, thereby improving the appearance effect of the curved glass cover plate 100; and the inorganic film layer 20 is not limited by the bending angle of the glass, and is well combined with the curved glass substrate 10, which is beneficial for preparing curved surfaces with various bending angles. Glass cover plate 100; At the same time, this application uses only inorganic film layer 20 for decoration, which avoids the use of organic substances and is green and environmentally friendly.

In the embodiment of the present application, the material of the light-permeable color film layer 21 may include one or more of inorganic oxides and simple metals. Specifically, the material of the light-permeable color film layer 21 can be, but is not limited to, silicon dioxide, niobium pentoxide, titanium pentoxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, tantalum pentoxide, magnesium oxide, One or more of aluminum, titanium, silver, and germanium. The material of the light-permeable color film layer 21 is selected from inorganic substances with colors, so that the light-permeable color film layer 21 presents colors, and has a decorative effect on the curved glass cover 100.

In the embodiment of the present application, the light-permeable color film layer 21 may be a single-layer structure or a multilayer stacked structure. When the light-permeable color film layer 21 is a multi-layer stacked structure, the material and thickness of each layer in the light-permeable color film layer 21 can be the same or different. The specific choice is based on actual needs. The light-permeable color film layer 21 can achieve rich color changes and improve the appearance of the curved glass cover 100; when the light-permeable color film layer 21 is a single-layer structure, the material selection, and the light-permeable color film layer 21 When it is a multi-layer stack structure, the choice of each layer of material can be one, so that the light-permeable color film layer 21 presents one color, or it can be a mixture of multiple materials, so that the light-permeable color film layer 21 is in different positions. Different colors are shown at different areas to achieve glare, or different materials may be used in different areas to achieve color contrast and improve the appearance and expressiveness of the curved glass cover 100.

In the embodiment of the present application, the visible light transmittance of the light-permeable color film layer 21 is greater than 70%, which is conducive to the color superimposition of the light-permeable color film layer 21 of the multilayer stack structure, and enriches the light-permeable color film layer 21 Colors. Further, the visible light transmittance of the light-permeable color film layer 21 is greater than 75%. Furthermore, the visible light transmittance of the light-permeable color film layer 21 is greater than 80%. Specifically, the visible light transmittance of the light-permeable color film layer 21 may be, but not limited to, 78%, 82%, 85%, 90%, etc.

In some embodiments of the present application, the light-permeable color film layer 21 includes an inorganic oxide film layer and a metal element film layer stacked on the curved glass substrate 10 in sequence. Among them, the inorganic oxide film layer can achieve selective reflection of light of different wavelengths through the stacking design of the film layer thickness, thus forming different color effects, and the metal element film layer has a special metallic luster and reflection effect, which is The arrangement on the inorganic oxide film layer can enhance the color expression of the light-permeable color film layer 21 and improve the appearance effect of the curved glass cover plate 100.

In the embodiments of the present application, the material of the inorganic oxide film layer can be, but is not limited to, silicon dioxide, niobium pentoxide, titanium pentoxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, tantalum pentoxide, and oxide. One or more of magnesium. Further, the material of the inorganic oxide film layer may be one or more of silicon dioxide, lanthanum trioxide, and magnesium oxide.

In the embodiment of the present application, the material of the simple metal film layer includes one or more of aluminum, titanium, silver, and germanium. When the thickness of the metal element film layer is too large, it will have a single mirror appearance when superimposed with the inorganic oxide film layer. Therefore, controlling the thickness of the metal element film layer to be relatively small and the reflectivity is relatively low, which is beneficial to produce a rich appearance effect. Wherein, when the thickness of the metal element film layer is less than 50 nm, it is beneficial to obtain a non-conductive metal element film layer, thereby reducing electromagnetic shielding generated when the curved glass cover 100 is used in an electronic device.

In the embodiment of the present application, the material of the light-shielding film layer 22 includes one or more of silicon, silicon carbide, aluminum titanium nitride, and hydrogen-containing diamond-like carbon, and the film layers formed by these materials have a good light-shielding effect. Specifically, the light-shielding film layer 22 can have an optical density value of 2-5 by controlling the material and film thickness, so that the light-shielding film layer 22 has an excellent shielding effect. Among them, the optical density (optical density, OD) value is a parameter for evaluating the light shielding ability of the coating, which represents the logarithm of the ratio of incident light to transmitted light or the logarithm of the reciprocal of light transmittance. The calculation formula is OD=lg (incident Light/transmitted light) or OD=lg (1/transmittance). In the embodiment of the present application, the light-shielding film layer 22 may be a single-layer structure or a multilayer stacked structure.

In the embodiment of the present application, the thickness of the inorganic film layer 20 may be 50 nm-2000 nm. The inorganic film layer 20 with a suitable thickness can form a strong bonding force with the curved glass substrate 10 without falling off, and at the same time, the curved glass cover 100 can obtain a better appearance effect. Further, the thickness of the inorganic film layer 20 is 100 nm-1800 nm. Furthermore, the thickness of the inorganic film layer 20 is 150 nm-1600 nm. Specifically, the thickness of the inorganic film layer 20 may be, but is not limited to, 80 nm, 200 nm, 350 nm, 500 nm, 750 nm, 1000 nm, 1200 nm, 1500 nm, etc.

In the embodiment of the present application, the thickness ratio of the light-permeable color film layer 21 and the light-shielding film layer 22 may be 1:(1-10). Among them, the light-permeable color film layer 21 is designed with a single-layer or multi-layer stack structure to present colors, and the thickness is relatively small. The small thickness is beneficial to prevent the film layer from being too thick and causing a single mirror appearance due to excessive reflectivity. The problem is that it is also conducive to cost control; the light-shielding film layer 22 is relatively thick, which is conducive to achieving a good light-shielding effect. Further, the thickness ratio of the light-permeable color film layer 21 and the light-shielding film layer 22 is 1:(1-9). Furthermore, the thickness ratio of the light-permeable color film layer 21 and the light-shielding film layer 22 is 1:(1-8). Specifically, the thickness ratio of the light-permeable color film layer 21 and the light-shielding film layer 22 can be, but not limited to, 1:1, 1:2, 1:3, 1:4.5, 1:5, 1:6, 1:7 Wait. In an embodiment of the present application, the thickness of the light-permeable color film layer 21 is 5 nm-1000 nm, and the thickness of the light-shielding film layer 22 is 25 nm-1800 nm.

In the embodiment of the present application, the thermal deformation temperature of the inorganic film layer 20 is greater than 500°C. The high thermal deformation temperature of the inorganic film layer 20 is beneficial to ensure the structural integrity of the inorganic film layer 20 and the bonding force with the glass substrate during the preparation process of the curved glass cover plate 100. At the same time, in the present application, hot bending is performed after the inorganic film layer 20 is prepared. The higher the thermal deformation temperature of the inorganic film layer 20, the lower the risk of deformation during hot bending, and the curved glass cover plate 100 with a larger bending angle can be prepared. , The integrity and appearance of the inorganic film layer 20 before and after hot bending are not affected. Further, the thermal deformation temperature of the inorganic film layer 20 is higher than the temperature of the hot bending treatment by 5°C or more, and further, it may be 10°C or more higher.

In some embodiments of the present application, when the light-permeable color film layer 21 is the outermost structure of the curved glass cover plate 100, especially when the light-permeable color film layer 21 is disposed on the appearance surface of the curved glass substrate 10, A protective layer is provided on the surface of the transparent color film layer 21 away from the curved glass substrate 10. The protective layer can effectively protect the light-permeable color film layer 21, avoid oxidation, abrasion, scratches, etc., and extend the service life of the curved glass cover plate 100. Specifically, the protective layer can be, but is not limited to, a hardened layer, a topcoat layer, an anti-fingerprint layer, and the like. When the light-permeable color film layer 21 is disposed on the appearance surface of the curved glass substrate 10, the protective layer is a transparent protective layer.

In the embodiment of the present application, the light-permeable color film layer 21 may partially cover the curved glass substrate 10 (that is, cover a part of the curved glass substrate 10 ), or may completely cover the curved glass substrate 10. Wherein, when the light-permeable color film layer 21 completely covers the curved glass substrate 10, the curved glass cover plate 100 can exhibit the color of the light-permeable color film layer 21 as a whole. When the light-permeable color film layer 21 partially covers the curved glass substrate 10, the light-permeable color film layer 21 may be a patterned structure, so that the curved glass cover plate 100 simultaneously presents color and pattern appearance effects.

In the embodiment of the present application, the light-shielding film layer 22 may also partially cover the curved glass substrate 10 or completely cover the curved glass substrate 10. The coverage area of the light-shielding film layer 22 can also be selected according to the coverage area of the light-permeable color film layer 21 to produce different appearance effects. In one embodiment, the coverage area of the light-shielding film layer 22 on the curved glass substrate 10 completely overlaps with the coverage area of the light-permeable color film layer 21 and completely covers the curved glass substrate 10. In another embodiment, the coverage area of the light-shielding film layer 22 on the curved glass substrate 10 and the coverage area of the light-permeable color film layer 21 completely overlap, and both cover a part of the curved glass substrate 10, so that the curved glass The cover plate 100 has a color pattern area and a transparent area, and the appearance effect is rich. In another embodiment, the coverage area of the light-permeable color film layer 21 on the curved glass substrate 10 does not overlap with the coverage area of the light-shielding film layer 22 on the curved glass substrate 10, and the curved glass cover 100 has a contrasting color The effect is different, and the light transmission performance of different areas is different. In other embodiments, the coverage area of the light-permeable color film layer 21 on the curved glass substrate 10 may partially overlap with the coverage area of the light-shielding film layer 22 on the curved glass substrate 10, but part of it does not overlap.

In the embodiment of the present application, the inorganic film layer 20 and the curved glass substrate 10 have a strong bonding force, and the present application adopts the method of first preparing the inorganic film layer 20 and then bending, the preparation of the inorganic film layer 20 and the curved glass cover 100 The bending angles do not affect each other, therefore, any bending angle can be produced, especially the curved glass cover 100 with a larger bending angle. Specifically, the bending angle of the curved glass cover plate 100 may be 10°-180°. More specifically, for example, 10°, 25°, 30°, 50°, 80°, 100°, 130°, 150°, 180°. In the present application, the curved glass cover 100 includes an inner concave surface and an outer convex surface that are arranged oppositely. The inner concave surface can be used as the appearance surface of the curved glass cover 100 or the outer convex surface can be used as the appearance surface of the curved glass cover 100. . Among them, the convex surface is used as the appearance surface of the curved glass cover 100, which can make the curved glass cover better cooperate with other electronic devices to form an accommodating space.

In the embodiment of the present application, the thickness of the curved glass substrate 10 is 0.1 mm-10 mm. Further, the thickness of the curved glass substrate 10 is 0.5 mm-8 mm. Specifically, the thickness of the curved glass substrate 10 can be, but is not limited to, 0.3 mm, 1 mm, 2 mm, 4 mm, 6.5 mm, 8 mm, or 9.5 mm. In the embodiment of the present application, the visible light transmittance of the curved glass substrate 10 may be greater than 85%. In order to improve the hardness and impact resistance of the curved glass cover plate 100, the curved glass substrate 10 may be a curved tempered glass substrate. In the embodiment of the present application, the optical density value of the curved glass cover 100 is 2-5, so that the curved glass cover 100 has the function of shielding the internal structure of the terminal.

In the curved glass cover 100 provided in the present application, the inorganic film layer 20 is used to give the curved glass substrate 10 a decorative appearance, uniform color and good visual effect. The preparation of the inorganic film layer 20 is not limited to the bending angle of the curved glass cover 100 , There is no need to use organic substances, which is beneficial to the application of the curved glass cover 100.

Correspondingly, please refer to FIG. 4. This application also provides a method for preparing the above-mentioned curved glass cover plate 100, including:

S101: Provide a flat glass substrate, deposit a light-permeable color film layer and a light-shielding film layer on the flat glass substrate to obtain a flat glass cover plate, and the light-permeable color film layer and the light-shielding film layer are laminated on one side of the flat glass substrate or The materials are respectively deposited on opposite sides of the flat glass substrate, and the material of the transparent color film layer includes at least one of inorganic oxide and simple metal.

S102: Bending the flat glass cover plate to obtain a curved glass cover plate.

In S101, the provision of a flat glass substrate can include, but is not limited to, providing glass, cutting the glass to obtain the required size; precision carving, such as computer digital control precision machining for edge grinding, etc.; and then sweeping processing , Make the surface more smooth; finally cleaned to obtain a flat glass substrate. Specifically, the cleaning operation can be, but is not limited to, cleaning the ion source for 1 min-10 min at a vacuum value of 0.05 Pa or less. Among them, the thickness of the flat glass substrate can be selected according to actual needs. In one embodiment, the thickness of the flat glass substrate is 0.1 mm-10 mm. Specifically, the thickness of the flat glass substrate may be, but not limited to, 0.3mm, 1mm, 2mm, 4mm, 6.5mm, 8mm, 9.5mm. In one embodiment, the visible light transmittance of the flat glass substrate is greater than 85%, so as to increase the application range of the curved glass cover.

In S101, the light-permeable color film layer and the light-shielding film layer prepared by the deposition method have strong bonding force and good heat resistance with the flat glass substrate. In one embodiment, a physical vapor deposition method is used to deposit the light-transmissive color film layer and the light-shielding film layer. Specifically, the physical vapor deposition can be, but is not limited to, evaporation, sputtering, ion plating and other methods. In an embodiment, the mask may be set on a flat glass substrate during the deposition process to form a transparent color film layer and a light-shielding film layer with a target pattern. Among them, the shape of the mask can be selected according to actual needs.

In S101, depositing a light-permeable color film layer and a light-shielding film layer on a flat glass substrate may specifically be: first deposit a light-permeable color film layer on the flat glass substrate, and then deposit a light-shielding film layer on the light-permeable color film layer , Or first deposit a light-shielding film layer on a flat glass substrate, and then deposit a light-permeable color film layer on the light-shielding film layer, or deposit a light-permeable color film layer and a light-shielding film layer on opposite sides of the flat glass substrate. When the light-permeable color film is used as the outermost layer of the flat glass cover, a protective layer can be deposited on the surface of the light-permeable color film to protect the light-permeable color film and the curved glass cover to avoid Oxidation, abrasion, scratching, etc., extend the service life. Specifically, the protective layer can be, but is not limited to, a hardened layer, a topcoat layer, an anti-fingerprint layer, and the like.

In this application, the heat distortion temperature of the light-permeable color film layer and the light-shielding film layer is not lower than the temperature of hot bending. Specifically, the heat distortion temperature of the light-permeable color film layer and the light-shielding film layer may be higher than the temperature of the heat bending treatment by 5° C. or more, and further, may be 10° C. or more. In one embodiment, the heat distortion temperature of the light-permeable color film layer and the light-shielding film layer is greater than 500°C, so that the light-permeable color film layer and the light-shielding film layer are basically not deformed during the bending process of the flat glass cover. , Maintain a good combination with the flat glass substrate to avoid falling off or cracking. In the embodiment of the present application, the material of the transparent color film layer can be selected from silicon dioxide, niobium pentoxide, titanium pentoxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, tantalum pentoxide, and magnesium oxide. One or more of, aluminum, titanium, silver and germanium. Further, the material of the transparent color film layer includes one or more of silicon dioxide, lanthanum trioxide, magnesium oxide, aluminum, titanium, silver, and germanium. In the embodiment of the present application, the material of the light-shielding film layer includes one or more of silicon, silicon carbide, aluminum titanium nitride, and hydrogen-containing diamond-like carbon.

In S102, hot bending includes fixing the flat glass cover plate in the hot bending forming mold, and maintaining it at 500°C-900°C and 0.05MPa-0.8MPa for 30s-200s. It can be set according to the thickness of the glass, the bending angle, and the specific hot bending process. In the embodiment of the present application, the temperature of the hot bending can be 550°C-860°C, or 550°C-800°C, or 580°C-750°C, and the pressure of the hot bending can be 0.05MPa-0.75MPa. It can be 0.1MPa-0.7MPa, or 0.2MPa-0.6MPa, and the hot bending time can be 30s-180s, 50s-160s, or 65s-150s to obtain curved glass with different bending angles. Cover plate.

In the embodiment of the present application, the hot bending forming mold includes a matching convex mold and a concave mold, and the inner concave surface and the outer convex surface of the formed curved glass cover plate are respectively consistent with the degree of curvature of the convex mold and the concave mold. In an embodiment of the present application, during the hot bending process, a pressure of 0.05 MPa-0.8 Mpa is applied to the punch and maintained at 500° C.-900° C. for 30 s-200 s. In another embodiment of the present application, during the hot bending process, a pressure of 0.01MPa-0.2MPa is applied to the convex mold, while a vacuum suction pressure of 0.04MPa-0.6Mpa is applied to the concave mold, and maintained at 500°C-900°C for 30s- 200s. By applying pressure on both sides of the flat glass cover, both sides are under pressure, and the pressure on both sides is smaller than that on only one side, and the force is more dispersed, which is more conducive to the overall structure of the glass and the inorganic film. protection of. Moreover, pressure on both sides can make the glass cover achieve the required bending effect at a relatively low temperature, such as 500℃-800℃, 500℃-750℃, 500℃-680℃, etc., which is also more conducive to protection The film structure ensures the yield of the curved glass cover plate.

In the embodiment of the present application, the method for preparing the curved glass cover plate may further include: after the hot bending treatment, the curved glass cover plate is tempered, and the tempering treatment may specifically include placing the curved glass cover plate at 300°C-500°C. Treatment in molten salt liquid for 0.5h-10h. Among them, the molten salt may include at least one of sodium nitrate and potassium nitrate. The thickness of the light-permeable color film layer and the light-shielding film layer in this application is light and thin. The curved glass substrate can undergo normal ion exchange in the molten salt to form a compressive stress layer on the surface of the glass and increase the strength of the curved glass cover. The stress value can be 500Mpa-800Mpa. Due to the existence of the inorganic film layer, the thickness of the film layer on both sides of the curved glass substrate will be different, which in turn affects the ion exchange rate. In order to ensure the stress of the glass substrate and the flatness of the surface, when the thickness difference between the two sides of the curved glass substrate is less than 500nm, the tempering time is controlled to be 0.5h-5h; when the thickness difference between the two sides of the curved glass substrate is 500nm- When 1000nm, the control tempering time is 2h-8h; when the thickness difference between the two sides of the curved glass substrate is greater than 1000nm, the control tempering time is 4h-10h. Wherein, when the light-permeable color film layer and the light-shielding film layer are arranged on one surface of the curved glass substrate, the thickness difference of the film layers on both sides of the curved glass substrate is the thickness of the inorganic film layer. When the light-permeable color film layer and the light-shielding film layer are arranged on opposite sides of the curved glass substrate, the thickness difference between the film layers on both sides of the curved glass substrate is the difference between the thickness of the light-permeable color film layer and the light-shielding film layer.

The method for preparing the curved glass cover provided by the application avoids the complexity of the coating process when the film is first bent and then coated by first depositing the film layer and then coating. The preparation process is simple and easy to operate; by depositing on a flat glass substrate The transparent color film and the light-shielding film have good film uniformity, good appearance, and strong bonding force with the flat glass substrate. The bending angle of the glass is not limited during the hot bending process, and the original can be better maintained. It has the performance of a film layer to achieve a decorative effect on the curved glass substrate; at the same time, the preparation process avoids the use of organic substances, and is green and environmentally friendly.

The present application also provides a terminal, which adopts the above-mentioned curved glass cover plate 100 to increase the curved effect and decoration, enhance the appearance and expressiveness of the terminal, and enhance the user experience. The terminal can be, but is not limited to, a mobile phone, a tablet computer, a smart wearable device, etc. Please refer to Fig. 5, the terminal includes a casing, a main board, a battery, etc. arranged inside the casing. The housing may include a front cover 200, a rear cover 400, and a middle frame 300 disposed between the front cover 200 and the rear cover 400, wherein one or more of the front cover 200, the middle frame 300, and the back cover 400 adopts Curved glass cover plate 100. In some embodiments, the front cover 200 may be the curved glass cover 100 provided for this application. At this time, the curved glass cover 100 has a visible area that is not covered with a light-transmissive color film layer and a light-shielding film layer, and the display panel Set corresponding to the viewing area. In other embodiments, it may also be the back cover 300 or the middle frame 400 used for the terminal as the curved glass cover 100 provided by this application.

The technical solution of the present application will be further elaborated below through specific embodiments.

Example 1

A method for preparing a curved glass cover plate includes the following steps:

(1) Provide a flat glass substrate with a thickness of 0.7mm. Place the flat glass substrate in the vapor deposition machine, close the vapor deposition machine door, and vacuum to 0.003Pa. First, clean the surface of the flat glass substrate with an ion source for 3 minutes, and then deposit the first and second substrates with a thickness of 20 nm on the surface of the flat glass substrate. A silicon oxide layer, a titanium pentoxide layer with a thickness of 100nm and a second silicon dioxide layer with a thickness of 30nm form a light-transmitting color film layer, and then silicon carbide is deposited on the surface of the second silicon dioxide layer to form a 300nm light-shielding film Layer to obtain a flat glass cover.

(2) Put the above flat glass cover into the hot bending mold (including the convex mold and the concave mold), and the hot bending mold is put into the hot bending machine, heated to 720°C, and at the same time, a pressure of 0.3Mpa is applied to the convex mold to maintain the pressure After 90s, the flat glass cover is softened and formed to obtain a curved glass cover with a bending angle of 89°.

(3) Put the prepared curved glass cover plate into potassium nitrate molten salt at 400° C., and ion exchange for 4 hours to obtain a tempered curved glass cover plate with a surface stress value of 700 MPa.

The color of the curved glass cover plate obtained in Example 1 is bright yellow, and the light-permeable color film layer and the light-shielding film layer in the curved glass cover plate maintain a good combination with the curved glass substrate, and no peeling or cracking phenomenon occurs.

Example 2

A method for preparing a curved glass cover plate includes the following steps:

(1) Provide a flat glass substrate with a thickness of 0.1mm. The flat glass substrate is placed in an ion plating coating machine, and a mask plate is installed so that the middle area of the flat glass substrate is shielded, and a certain width area at the edge is exposed. Close the door of the coating machine, pump the vacuum to 0.05 Pa, clean the surface of the flat glass substrate with an ion source for 5 minutes, and then deposit an aluminum layer with a thickness of 5 nm, a layer of niobium pentoxide with a thickness of 10 nm, and a niobium pentoxide layer with a thickness of 5 nm on the surface of the flat glass substrate. A tantalum oxide layer is formed to form a light-transmitting color film layer, and then a 20nm silicon layer and a 10nm aluminum titanium nitride layer are sequentially deposited on the surface of the tantalum pentoxide layer to form a light-shielding film layer to obtain a flat glass cover plate.

(2) Put the above flat glass cover plate into the hot bending mold (including the punch and the concave mold), put the hot bending mold into the hot bending machine, heat it to 600℃, and apply 0.8Mpa pressure to the punch at the same time to keep the pressure After 200s, the flat glass cover is softened and formed to obtain a curved glass cover with a bending angle of 180°.

(3) Put the prepared curved glass cover into a molten salt of potassium nitrate and sodium nitrate (mass ratio 9:1) at 300°C, and exchange ion for 0.5h to obtain a tempered curved glass cover. The surface stress The value is 500MPa.

The color of the curved glass cover plate obtained in Example 2 is light blue, and the light-permeable color film layer and the light-shielding film layer in the curved glass cover plate maintain a good combination with the curved glass substrate.

Example 3

A method for preparing a curved glass cover plate includes the following steps:

(1) Provide a flat glass substrate with a thickness of 10mm. Place the flat glass substrate in the sputtering machine, close the door of the sputtering machine, and pump the vacuum value to 0.03Pa. First, clean the surface of the flat glass substrate with an ion source for 1 min, and then deposit the coating material zirconium dioxide on the surface of the flat glass substrate. A 200nm transparent color film layer is formed. Then sequentially deposit a 1000nm silicon carbide layer, a 500nm silicon layer and a 300nm hydrogen-containing diamond-like carbon layer to form a light-shielding film layer to obtain a flat glass cover plate.

(2) Put the above flat glass cover into the hot bending mold (including the convex mold and the concave mold), put the hot bending mold into the hot bending machine, heat it to 900℃, and apply a pressure of 0.05Mpa to the convex mold at the same time to maintain the pressure In 30s, the flat glass cover is softened and then molded to obtain a curved glass cover with a bending angle of 10°.

(3) Put the prepared curved glass cover plate into sodium nitrate molten salt at 500° C., and ion exchange for 10 hours to obtain a tempered curved glass cover plate with a surface stress value of 800 MPa.

The color of the curved glass cover plate obtained in Example 3 is bright black, and the transparent color film layer and the light-shielding film layer in the curved glass cover plate maintain a good combination with the curved glass substrate.

Comparative example 1

Provide a flat glass substrate with a thickness of 0.7mm. Screen printing ink on the surface of a flat glass substrate and bake at 150°C for 30 minutes to obtain an ink layer of 25 μm. Put the flat glass substrate with the ink layer into the hot bending mold (including the convex mold and the concave mold), put the hot bending mold into the hot bending machine, heat it to 720°C, and apply a pressure of 0.1Mpa to the punch at the same time, and hold the pressure for 90s , The flat glass cover is softened and formed, and the bending angle is 89°. After the glass is taken out, the ink layer has been carbonized and peeled off, and subsequent processes cannot be carried out.

Compared with Example 1, in Comparative Example 1, even if hot bending is performed under a lower pressure, the flat glass substrate decorated with the ink layer still cannot form a curved glass with decorative effect after hot bending, which cannot meet the application requirements. However, the inorganic film layer of the curved glass cover plate prepared by the present application is well combined with the curved glass substrate, and no peeling or cracking occurs, which is beneficial to its application.

The above are the preferred embodiments of this application, but they should not be understood as a limitation to the scope of the patent. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of this application, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of this application.

Claims (21)

1. A curved glass cover plate, which is characterized by comprising a curved glass substrate and an inorganic film layer arranged on the curved glass substrate. The inorganic film layer includes a light-transmissive color film layer and a light-shielding film layer. The material of the light-transmitting color film layer includes at least one of inorganic oxide and simple metal. The light-transmitting color film layer and the light-shielding film layer are laminated on one side surface of the curved glass substrate or are respectively arranged on the surface of the curved glass substrate. The opposite sides of the curved glass substrate.
2. The curved glass cover of claim 1, wherein the inorganic oxide includes silicon dioxide, niobium pentoxide, titanium pentoxide, titanium dioxide, zirconium dioxide, lanthanum trioxide, and two One or more of tantalum and magnesium oxide.
3. The curved glass cover plate of claim 1, wherein the metal element includes one or more of aluminum, titanium, silver, and germanium.
4. The curved glass cover according to any one of claims 1 to 3, wherein the light-permeable color film layer comprises an inorganic oxide film layer and a metal element film layer which are sequentially stacked on the curved glass substrate. Floor.
5. The curved glass cover plate according to any one of claims 1 to 4, wherein the material of the light-shielding film layer includes one or more of silicon, silicon carbide, aluminum titanium nitride, and hydrogen-containing diamond-like carbon .
6. The curved glass cover plate according to any one of claims 1 to 5, wherein the thermal deformation temperature of the inorganic film layer is greater than 500°C.
7. The curved glass cover of any one of claims 1-6, wherein the thickness of the inorganic film layer is 50nm-2000nm, and the thickness of the light-permeable color film layer and the light-shielding film layer is greater than It is 1: (1-10).
8. The curved glass cover plate according to any one of claims 1-7, wherein the light-permeable color film layer is a single-layer or multi-layer stack structure, and the light-shielding film layer is a single-layer or multi-layer stack structure structure.
9. 8. The curved glass cover plate of any one of claims 1-8, wherein when the light-permeable color film layer and the light-shielding film layer are stacked on one side surface of the curved glass substrate, The light-permeable color film layer is located between the curved glass substrate and the light-shielding film layer, or the light-shielding film layer is located between the curved glass substrate and the light-permeable color film layer.
10. The curved glass cover plate according to any one of claims 1-9, wherein when the light-permeable color film layer is the outermost structure of the curved glass cover plate, the light-permeable color film A protective layer is provided on the side surface of the film layer away from the curved glass substrate.
11. The curved glass cover plate according to any one of claims 1-10, wherein the thickness of the curved glass substrate is 0.1mm-10mm.
12. The curved glass cover plate according to any one of claims 1-11, wherein the bending angle of the curved glass cover plate is 10°-180°.
13. The curved glass cover plate according to any one of claims 1-12, wherein the optical density value of the curved glass cover plate is 2-5.
14. A method for preparing a curved glass cover plate, which is characterized in that it comprises:

    Provide a flat glass substrate, deposit a light-permeable color film layer and a light-shielding film layer on the flat glass substrate to obtain a flat glass cover plate, the light-permeable color film layer and the light-shielding film layer are laminated on the flat glass One side surface of the substrate or respectively deposited on two opposite sides of the flat glass substrate, and the material of the transparent color film layer includes at least one of inorganic oxide and simple metal;

    The flat glass cover plate is thermally bent to obtain a curved glass cover plate.
15. The preparation method of claim 14, wherein the hot bending comprises:

    The flat glass cover plate is fixed in a hot bending forming mold and maintained at 500° C. to 900° C. and 0.05 MPa to 0.8 MPa for 30 s to 200 s, wherein the hot bending forming mold includes a concave mold and a convex mold.
16. The preparation method according to claim 15, characterized in that, in the hot bending process, a pressure of 0.05 MPa-0.8 MPa is applied to the punch.
17. The preparation method according to claim 15, characterized in that, in the hot bending process, a pressure of 0.01MPa-0.2MPa is applied to the convex mold, and a vacuum suction of 0.04MPa-0.6Mpa is applied to the concave mold at the same time. pressure.
18. 17. The preparation method according to any one of claims 14-17, further comprising: after the hot bending treatment, tempering the curved glass cover plate.
19. The preparation method according to claim 18, wherein the tempering treatment comprises placing the curved glass cover plate in a molten salt liquid at 300°C-500°C for 0.5h-10h.
20. The preparation method of claim 19, wherein when the thickness difference between the film layers on both sides of the curved glass substrate is less than 500nm, the tempering treatment time is controlled to be 0.5h-5h; when the film on both sides of the curved glass substrate When the thickness difference of the layers is 500nm-1000nm, the tempering treatment time is controlled to be 2h-8h; when the thickness difference of the film layers on both sides of the curved glass substrate is greater than 1000nm, the tempering treatment time is controlled to be 4h-10h.
21. A terminal, characterized in that it comprises a curved glass cover plate made according to any one of claims 1-13 or a preparation method according to any one of claims 14-20.

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