Glass product and electronic equipment

Abstract

The utility model provides a glass product and electronic equipment. The glass product comprises a glass substrate, the glass substrate is provided with a first surface and a second surface which are arranged back to back, the first surface is provided with a superhard film, and the second surface is provided with a brightness enhancement film; wherein the reflectivity of the brightness enhancement film is greater than or equal to 25%, and the light transmittance of the superhard film is greater than or equal to 50%. And by virtue of the matching of the brightness enhancement film and the superhard film, the glass product can be ensured to have good wear resistance, the strength of the glass product is not obviously reduced, and the color adjustable range is wide.

Description

Technical Field

[0001] The present application relates to the technical field of decorative glass, and in particular to a glass product and an electronic device. Background Art

[0002] Glass is a common material for the back cover of electronic devices such as mobile phones. In order to enhance the ornamental value of the back cover, various coating decorations are applied to the glass substrate. The most common method is to make a super-hard film on one side of the glass substrate (usually the outer side) to increase the decorativeness while also improving the hardness of the back cover and increasing its wear resistance. However, after the super-hard film is coated on one side of the glass substrate, its strength is seriously reduced compared to the uncoated glass substrate, and the percentage of reduction is usually more than 30%, which in turn affects the drop resistance of the electronic device; in addition, when the existing glass products with super-hard film coated on one side reach a higher brightness, the thickness of the super-hard film will be thicker, which increases the production cost and causes the color adjustability of the glass products to be poor. Utility Model Content

[0003] In view of this, the present application provides a glass product and an electronic device. The glass product is provided with a superhard film and a brightness enhancement film on opposite sides of a glass substrate, respectively. With the cooperation of the brightness enhancement film and the superhard film, the glass product can ensure that the strength of the glass product is not significantly reduced and the color adjustment range is wide while having good wear resistance.

[0004] Specifically, the first aspect of the present application provides a glass product, which includes a glass substrate, the glass substrate having a first surface and a second surface arranged opposite to each other, a superhard film is arranged on the first surface, and a brightness enhancing film is arranged on the second surface; wherein the reflectivity of the brightness enhancing film is greater than or equal to 25%, and the transmittance of the superhard film is greater than or equal to 50%.

[0005] The glass substrate is provided with a superhard film on one side and a brightness enhancement film on the other side. On the one hand, the combination of the two films can reduce the effect of the stress of the superhard film on the strength of the glass, avoid a significant reduction in the strength of the glass after coating, increase its impact resistance, and ensure its good wear resistance; on the other hand, the introduction of a brightness enhancement film with high reflectivity can increase the brightness of the glass product, thereby significantly reducing the thickness of the superhard film, reducing the production cost of the superhard film, and widening the color adjustable range of the glass product. The glass product is particularly suitable for the back cover of electronic equipment.

[0006] The second aspect of the present application provides an electronic device, the electronic device comprising a housing assembled outside the electronic device and a circuit board located inside the housing, the housing comprising the glass product according to the first aspect of the present application. The housing using the glass product can be specifically a back cover of the electronic device, or a camera protection cover.

[0007] The housing of the electronic device includes the above-mentioned glass product, which has good wear resistance, drop resistance and color-adjustable appearance. The electronic device includes but is not limited to mobile phones, tablet computers, laptop computers, smart watches, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a structural schematic diagram of a glass product commonly used in mobile phone back covers.

[0009] Figure 2 A schematic structural diagram of a glass product provided in one embodiment of the present application.

[0010] Figure 3 This is a schematic structural diagram of a glass product provided in another embodiment of the present application.

[0011] Figure 4 A schematic structural diagram of a glass product provided in yet another embodiment of the present application.

[0012] Figure 5 This is a schematic diagram of the structure of a glass product provided in other embodiments of the present application.

[0013] Fig. 6A It is a schematic diagram of the three-dimensional structure of an electronic device provided in one embodiment of the present application.

[0014] Figure 6B for Fig. 6A Schematic diagram of the rear structure of the electronic device.

[0015] Figure 7 Schematic diagram of testing glass strength based on the four-point bending test method.

[0016] Fig. 8A This is the reflection curve of the glass product of Comparative Example 2.

[0017] Figure 8B This is the reflection curve of the glass product in Example 1 of the present application. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0019] At present, the back cover of mobile phones and other electronic devices usually uses glass products with super hard film on one side. Its structure is as follows Figure 1As shown, the glass product 100 includes a glass substrate 10, and a superhard film 20 is provided on one side of the glass substrate 10 (specifically, the outer side facing the outside of the electronic device). Because the glass product 100 has a film layer with a higher hardness only on one side and there is no film layer with a higher hardness on the other side to balance, the strength of the glass product 100 is significantly reduced compared to the strength of the glass substrate 10, and the strength reduction percentage is more than 30%, which seriously reduces the impact resistance of the glass product 100 (such as poor drop resistance). In addition, in order to achieve a higher brightness of the glass product 100, the thickness of the superhard film 20 is usually thicker, more than 1μm, and its production cost is relatively high. The color decoration range of the overly thick high-brightness superhard film 20 is narrow, resulting in poor color adjustability of the glass product 100. In order to solve the above-mentioned problems existing in existing glass products, the embodiments of the present application provide a glass product that can take into account good wear resistance, high strength, low thickness, and wide color adjustability.

[0020] See also Figure 2 , Figure 2 A structural schematic diagram of a glass product provided in an embodiment of the present application. The glass product 200 provided in the embodiment of the present application includes a glass substrate 10, the glass substrate 10 has a first surface 101 and a second surface 102 arranged opposite to each other, a superhard film 20 is arranged on the first surface 101, and a brightness enhancement film 50 is arranged on the second surface 102. Among them, the reflectivity of the brightness enhancement film 50 is greater than or equal to 25%, and the transmittance of the superhard film 20 is greater than or equal to 50%. Obviously, the brightness enhancement film 50 and the superhard film 20 have different functions. In addition to having a higher hardness, the superhard film 20 has a higher transmittance, while the brightness enhancement film 50 has a higher reflectivity and poor light transmittance.

[0021] When the glass product 200 is used as a housing of an electronic device, such as a back cover, the first surface 101 faces the outside of the electronic device (the "outside" specifically refers to the part that a user can directly touch or see), and the second surface 102 faces the inside of the electronic device, so the first surface 101 can be called the "outer surface" and the second surface 102 can be called the "inner surface". Accordingly, the superhard film 20 faces the outside of the electronic device, and the brightness enhancement film 50 faces the inside of the electronic device.

[0022] The present application sets a superhard film 20 on the outer surface of the glass substrate 10 and a brightness enhancement film 50 on the inner surface. On the one hand, by means of the cooperation between the brightness enhancement film 50 and the brightness enhancement film 50 on both sides of the glass substrate, while ensuring that the wear resistance of the glass product 200 is still high, the stress of the superhard film on one side can be reduced to reduce the reduction effect of the glass strength, and the stress on both sides of the glass substrate can be "balanced", so that the strength of the glass product 200 is relatively high, ensuring that it has good impact resistance. On the other hand, the introduction of the brightness enhancement film 50 with high reflectivity can significantly increase the brightness of the glass product 200. Specifically, when light enters from the outside of the glass product 200, after passing through the superhard film 20 with high transmittance and the glass substrate 10, after being reflected by the brightness enhancement film 50 with high reflectivity, more light will pass through the glass substrate 10 and the superhard film 20 to enter the human eye, and the brightness of the glass product 200 seen by the human eye is higher. When the glass product 200 of the embodiment of the present application and the existing glass product 100 achieve the same brightness, the thickness of the superhard film 20 in the glass product 200 of the embodiment of the present application is significantly lower than the thickness of the superhard film 20 in the existing glass product 100. In this way, the production cost of the superhard film 20 in the glass product 200 of the embodiment of the present application is reduced, and the superhard film 20 with a lower thickness is not easy to warp, which increases the stability of the film layer; and the thickness of the superhard film 20 is reduced, and its reflection curve is smoother and the color stability is better when the film system is designed, which is convenient for adjusting the color of the glass product 200 and widening the color adjustable range of the glass product 200. In addition, the reduced thickness of the superhard film 20 is also conducive to the overall thickness of the glass product 200 being appropriately lower than that of the glass product 100, which is conducive to the production of a lightweight electronic device casing.

[0023] Therefore, the glass product 200 provided in the embodiment of the present application can take into account many advantages such as high hardness (which can be well reflected in wear resistance), high strength, low thickness, wide color adjustability, etc. The glass product 200 is suitable for making electronic devices with good mechanical properties and high aesthetics.

[0024] In the present application, the reflectivity of the brightness enhancement film 50 is controlled to be greater than or equal to 25% in order to ensure the brightening effect of the brightness enhancement film 50 on the color, and to avoid the reflectivity of the brightness enhancement film 50 being too low and weakening the brightening effect. In addition, the transmittance of the superhard film 20 (specifically the transmittance of visible light) is controlled to be greater than or equal to 50% in order to ensure that the loss of light in the process of passing through the superhard film 20 is not too low, and to avoid the reduction of the brightening effect of the light reflected from the brightness enhancement film 50 after passing through the superhard film 20. In some embodiments of the present application, the reflectivity of the brightness enhancement film 50 is above 30%, and can further be above 40%, or above 50%, or above 60%, or above 70%, etc. The visible light transmittance of the superhard film 20 is above 55%, above 60%, or above 70%, or above 80%, or above 90%, etc. In addition, the visible light transmittance of the brightness enhancement film 50 is less than 50%.

[0025] In the embodiment of the present application, the pencil hardness of the brightness enhancement film 50 is above 5H. The brightness enhancement film 50 has a high hardness. When it is arranged on the other side of the glass substrate opposite to the superhard film 20, it can better offset the influence of the stress of the single-sided superhard film on the glass strength. The term "pencil hardness" is a scratch hardness measured according to the pencil hardness determination method of the coating film.

[0026] In the present application, under the same hardness comparison standard, the hardness of the superhard film 20 is greater than the hardness of the brightness enhancement film 50. In the embodiment of the present application, the pencil hardness of the superhard film 20 can be 9H; the Mohs hardness of the superhard film 20 can reach 7 or more. The hardness of the superhard film 20 located on the outside of the glass substrate is relatively high, which is convenient for ensuring that the glass product 200 has excellent wear resistance. Among them, the term "Mohs hardness" is also called scratch hardness, which is a relative hardness. It uses 10 natural minerals as standards. The hardness order does not indicate the determination of the hardness value of the object to be tested, but only indicates that minerals with a high hardness order can scratch minerals with a low hardness order. The hardness of other minerals is determined by comparing with the standard minerals. In the present application, the Mohs hardness is measured by scratching the surface of the object to be tested using a pyramidal diamond drill needle with a known hardness using the scratch method.

[0027] In the embodiment of the present application, the bending strength of the glass product 100 measured by the four-point bending test method is less than 20% compared with the bending strength of the glass substrate 10 without the brightness enhancement film 50 and the superhard film 20. For example, if the bending strength of the glass product 100 is recorded as a MPa, the bending strength of the simple glass substrate 10 is recorded as b MPa, and the above-mentioned reduction percentage is recorded as k, then k=(ba) / b×100%. In some embodiments, the reduction percentage is less than 15%, and can further be less than 12%, or less than 11%, or less than 10%.

[0028] In the embodiment of the present application, the bending strength of the glass product 100 measured based on the four-point bending test method can be above 490 MPa, and can further be above 510 MPa, or above 530 MPa, or above 535 MPa, or above 540 MPa, etc.

[0029] In the embodiment of the present application, based on the four-point bending test method, when the bending load applied to the glass product is ≥300N, the glass product does not break, which indicates that the glass product has high mechanical strength.

[0030] In some embodiments of the present application, the thickness d1 of the brightness enhancement film 50 and the thickness d2 of the superhard film 20 satisfy the following relationship: 0.4d2≤d1<d2. d1 and d2 are measured in the same unit. The brightness enhancement film 50 whose thickness satisfies this relationship is arranged on the other side of the glass substrate opposite to the superhard film 20, which can better offset the effect of the stress of the single-sided superhard film on the strength of the glass. In this case, the percentage decrease of the bending strength of the glass product 100 compared with the bending strength of the glass substrate 10 measured by the four-point bending test method is less than 15%. Among them, the bending strength of the glass product 100 can be above 510MPa, and further above 530MPa. In some embodiments, d1 / d2 can be in the range of 0.5-0.95, for example, specifically 0.55, 0.60, 0.65, 0.68, 0.70, 0.72, 0.75, 0.80 or 0.90, etc.

[0031] In the embodiment of the present application, in order to ensure that the hardness of the superhard film 20 is high and the wear resistance is good, the thickness d2 of the superhard film 20 can be greater than or equal to 600nm. In some embodiments, the thickness d2 of the superhard film 20 can be in the range of 600nm-950nm. The superhard film 20 of appropriate thickness can increase the brightness of the glass product 200 and increase the color adjustable range while ensuring the high hardness of the glass product 200 and the stable film structure, and cooperate with the aforementioned brightness enhancement film 50. Exemplarily, d2 can be 620nm, 640nm, 660nm, 680nm, 700nm, 720nm, 750nm, 800nm, 820nm, 850nm, 900nm, 950nm, etc. In some embodiments, d2 can be in the range of 600-900nm, and further in the range of 600-860nm.

[0032] In some embodiments of the present application, the thickness d1 of the brightness enhancement film 50 may be in the range of 240-600 nm. The brightness enhancement film 50 of appropriate thickness can better offset the stress generated by the superhard film on one side while ensuring the brightness of the glass product 100, thereby enhancing the strength of the glass product.

[0033] In the embodiment of the present application, the brightness enhancement film 50 includes a laminated structure formed by alternating a first high refractive index material layer and a first low refractive index material layer. In other words, the brightness enhancement film 50 includes at least one first high refractive index material layer (abbreviated as A layer) and at least one first low refractive index material layer (abbreviated as B layer), and the A layer and the B layer are alternately stacked. It can be understood that the refractive index of the A layer is greater than the refractive index of the B layer. In the direction from the glass substrate 10 to the brightness enhancement film 50, the laminated structure of the brightness enhancement film 50 can be (AB) n , or (BA) n , or (AB) n -A, or (BA)n -B arrangement form (n is an integer greater than or equal to 1). The thickness of each A layer can be the same or different. The thickness of each B layer can be the same or different.

[0034] In the embodiment of the present application, the refractive index of layer A may be greater than or equal to 2.0, and the refractive index of layer B may be less than or equal to 1.55. Wherein, layer A may include one of a niobium pentoxide layer (i.e., Nb2O5 layer), a titanium dioxide layer (i.e., TiO2 layer), a titanium pentoxide layer (i.e., Ti3O5 layer), a niobium nitride layer (e.g., NbN layer), or a titanium boride layer (e.g., TiB layer). Wherein, layer B may include one of a silicon dioxide layer (i.e., SiO2 layer), an aluminum oxide layer (i.e., Al2O3 layer), or a magnesium fluoride layer (i.e., MgF2 layer).

[0035] In some embodiments of the present application, the A layer is a niobium pentoxide layer, and the B layer is a silicon dioxide layer. The high refractive index material in the brightness enhancement film 50 is Nb2O5, which has a relatively high refractive index, generally about 2.3, is not easy to change, has stable performance, and has a small absorption coefficient, which is conducive to ensuring that the brightness enhancement film 50 meets the optical design requirements. The low refractive index material in the brightness enhancement film 50 is SiO2, which has a relatively low refractive index, about 1.45, and the manufacturing cost of SiO2 is relatively low.

[0036] In some embodiments of the present application, the brightness enhancement film 50 further includes an indium layer (i.e., In layer), and the presence of the indium layer can enhance the reflective effect of the brightness enhancement film 50. The indium layer is located between any adjacent first high refractive index material layer (A layer) and the first low refractive index material layer (B layer). For example, in some embodiments, the brightness enhancement film 50 includes two A layers and two B layers, and the A layers and the B layers are alternately stacked, and the A layer is in contact with the glass substrate 10. Then, from the direction of the glass substrate 10 to the brightness enhancement film 50, the indium layer can be located between the first A layer and the first B layer, or between the first B layer and the second A layer, or between the second A layer and the second B layer. If the indium layer is recorded as the C layer, then, from the direction of the glass substrate 10 to the brightness enhancement film 50, the brightness enhancement film 50 can be specifically arranged in the form of ACBAB, ABCAB, or ABACB.

[0037] In the embodiment of the present application, the superhard film 20 includes a laminated structure formed by alternating a first superhard high refractive index material layer (abbreviated as D layer) and a second low refractive index material layer (abbreviated as E layer). It can be understood that the refractive index of the D layer is greater than that of the E layer. In other words, the superhard film 20 includes at least one D layer and at least one E layer, and the D layer and the E layer are alternately stacked, and the refractive index of the D layer is greater than that of the E layer. Among them, from the direction of the glass substrate 10 to the superhard film 20, the laminated structure of the superhard film 20 can be (DE) n , or (ED)n , or (DE) n -D, or (ED) n -E arrangement form (n is an integer greater than or equal to 1). The thickness of each D layer can be the same or different. The thickness of each E layer can be the same or different.

[0038] In the embodiment of the present application, the refractive index of the D layer may be greater than or equal to 1.65, and the refractive index of the E layer may be less than or equal to 1.55. The E layer may include a silicon dioxide layer (i.e., a SiO2 layer) or an aluminum oxide layer (i.e., an Al2O3 layer). The D layer may include a silicon nitride layer (SiN x layer), zirconium dioxide layer (ie, ZrO2 layer), aluminum nitride layer (AlN x The refractive index of the silicon nitride layer and the aluminum nitride layer can be greater than or equal to 1.65; the refractive index of the silicon nitride layer, the zirconium dioxide layer, and the aluminum nitride layer can be greater than or equal to 1.85.

[0039] In some embodiments of the present application, the D layer is a silicon nitride layer, and the E layer is a silicon dioxide layer. The high refractive index superhard material in the superhard film 20 is silicon nitride (refractive index is generally around 1.95), which has high hardness, excellent wear resistance, stable chemical properties, and can effectively increase the hardness and wear resistance of the superhard film 20. The low refractive index material in the brightness enhancement film 50 is SiO2, which has a low refractive index of around 1.45 and a low manufacturing cost.

[0040] Among them, the above-mentioned A layer, B layer, D layer, and E layer can be independently plated by chemical vapor deposition or physical vapor deposition, wherein chemical vapor deposition includes but is not limited to hot wire chemical vapor deposition, or plasma enhanced chemical vapor deposition. Physical vapor deposition includes but is not limited to magnetron sputtering, vacuum evaporation, ion plating (such as arc ion plating, radio frequency ion plating), etc. In some embodiments of the present application, the A layer, B layer, D layer, and E layer are all plated by magnetron sputtering. An exemplary plating process is as follows: the reaction gas and sputtering protection gas used to form the film layer can be filled into the vacuum deposition chamber and ionized. Under the action of a strong magnetic field, the ionization can bombard the surface of the sputtering target material to deposit and form a corresponding film layer on the surface of the substrate to be plated. In addition, in the magnetron sputtering process, ICP (Inductively Coupled Plasma) can be used for auxiliary coating to improve the bonding strength of the film layer. Among them, adjusting parameters such as the pressure in the deposition chamber, the temperature of the substrate to be plated, the rate of magnetron sputtering, the target power, the flow rate of the reaction gas and sputtering gas, and the power of ICP can control the thickness and performance of the film layer.

[0041] In the embodiment of the present application, the thickness of the glass substrate 10 may be in the range of 0.4 mm-1.0 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc. The glass substrate 10 is the substrate of the glass product 200, and plays a supporting role for the superhard film 20, the brightness enhancement film 50, etc. The glass substrate 10 may be silicate glass, borate glass, phosphate glass, etc. In addition, these glass substrates may be chemically strengthened glass substrates to provide a protective effect when used as an electronic device housing.

[0042] In some implementation modes of the present application, Figure 3 As shown, an anti-fingerprint layer (AF) 30 is also provided on the side of the superhard film 20 facing away from the glass substrate 10. That is, the superhard film 20 and the anti-fingerprint layer 30 are sequentially stacked on the first surface 101. The anti-fingerprint layer 30 is mainly used to reduce the formation of fingerprints on the glass product 200 when the user touches it, so as not to affect the appearance of the glass product 200. The thickness of the anti-fingerprint layer 30 can be in the range of 5nm-30nm.

[0043] In some implementation modes of the present application, Figure 3 As shown, an ink layer 40 is also provided on the side of the brightness enhancement film 50 away from the glass substrate 10. The ink layer 40 mainly plays a covering role, for example, covering the wiring structure set on the inner side of the glass product 200 later, so as to improve the visual effect of the glass product 200. Among them, the ink layer 40 can be set by screen printing or inkjet printing, and the ink layer 40 can be a complete film layer or a film layer set in an array. In addition, the color of the ink layer 40 can include but is not limited to red, orange, yellow, green, cyan, blue, purple, black, etc. Any different colors can be selected to meet different usage requirements. In some specific embodiments, the color of the ink layer 40 is black. The setting position, thickness, color, etc. of the ink layer 40 can be adjusted according to the desired visual effect of the glass product 200. Exemplarily, the thickness of the ink layer 40 can be in the range of 10μm-50μm.

[0044] See also Figure 4 , Figure 4 This is a schematic structural diagram of a glass product provided in yet another embodiment of the present application. Figure 4 The glass products shown are the same as those mentioned above. Figure 3 The glass products shown differ in that: Figure 4 The glass article 200 further includes a support film 60 , which is located between the brightness enhancement film 50 and the ink layer 40 .

[0045] The support film 60 can be used to support the ink layer 40. For example, the ink layer 40 can be formed on one side of the support film 60, and then the other side of the support film 60 is bonded to the glass substrate 10 with the superhard film 20 and the brightness enhancement film 50 on the opposite sides. In the embodiment of the present application, the material of the support film 60 may include polyethylene terephthalate (PET) or polyimide (PI). In addition, in order to facilitate the stable bonding between the support film 60 and the glass substrate 10 with the superhard film 20 and the brightness enhancement film 50 on the opposite sides, the surface of the support film 60 may be provided with an adhesive layer, such as OCA (Optically Clear Adhesive) optical adhesive or pressure-sensitive adhesive. The thickness of the support film 60 can be in the range of 0.1mm-0.5mm.

[0046] Figure 4 In the glass product 200 shown in the figure, the superhard film 20 and the brightness enhancement film 50 are respectively arranged on the opposite sides of the glass substrate 10, and the above-mentioned Figure 2 That is, by coating the superhard film on the outside and the brightness enhancement film on the inside, the brightness enhancement film 50 can be used to offset the effect of the stress of the superhard film on the glass strength, ensuring that the strength of the glass product 200 will not be significantly reduced compared to the uncoated glass substrate; and the thickness of the superhard film can be reduced, increasing the color adjustable range of the glass product 200. Among them, the superhard film 20, the anti-fingerprint layer 30, the brightness enhancement film 50, and the ink layer 40 can be referred to the previous description of this application.

[0047] See also Figure 5 , Figure 5 This is a schematic structural diagram of a glass product provided in yet another embodiment of the present application. Figure 5 With the aforementioned Figure 3 The glass products shown differ in that: Figure 5 The glass article 200 further includes a support film 60 , which is located between the glass substrate 10 and the brightness enhancement film 50 .

[0048] Figure 5 The support film 60 in the figure can be used to support the brightness enhancement film 50 and the ink layer 40. For example, the brightness enhancement film 50 can be plated on the first side of the support film 60, and then the ink layer 40 can be printed, and then the second side of the support film 60 (opposite to the first side) can be bonded to the glass substrate 10 with the superhard film 20 formed on one side, and the superhard film 20 and the support film 60 can be located on opposite sides of the glass substrate 10. Similarly, in order to facilitate the stable bonding of the support film 60 and the glass substrate 10, the surface of the support film 60 can be provided with an adhesive layer, such as OCA adhesive or pressure-sensitive adhesive.

[0049] Figure 5In the glass product 200 shown in the figure, the superhard film 20 and the brightness enhancement film 50 are respectively arranged on the opposite sides of the glass substrate 10, and the above-mentioned Figure 2 The glass product shown has a similar effect. Regarding the superhard film 20, the anti-fingerprint layer 30, the brightness enhancement film 50, and the ink layer 40, reference can be made to the previous description of this application.

[0050] In the present application, the simulated prototype composed of the above-mentioned glass products and a 200g counterweight is placed in a vibration wear tester filled with abrasive particles, and more than half of the body of the simulated prototype is kept immersed in the abrasive particles. The wear test is carried out for more than 120 minutes at a vibration frequency of 5050±0.5HZ. There is no obvious wear and scratch on the surface of the glass product. This shows that the glass product has good wear resistance and good application prospects. Among them, when the glass product is used to prepare the above-mentioned simulated prototype, the 200g counterweight is set on one side of its brightness enhancement film.

[0051] In some embodiments of the present application, the thickness of each of the above-mentioned glass products 100 can be in the range of 0.05mm-0.2mm. In this case, the bending radius of the glass product can still be less than or equal to 5mm. This shows that the thinner glass product with the above-mentioned superhard film 20 and the brightness enhancement film 50 can still have good bending properties, and can be suitable for making ultra-thin flexible glass (UTG) for foldable electronic devices. Moreover, the film layers of the glass product are free of cracks, breakage, and falling off. Specifically, the thickness of the above-mentioned glass product 100 can be specifically 0.06mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, or 0.2mm, etc. Further, in this case, based on the four-point bending test method, when the bending load applied to such a glass product is ≥300N, it does not break.

[0052] The present application also provides an electronic device, the housing of which may include the glass product of the present application. Fig. 6A and Figure 6B , Fig. 6A is a three-dimensional structural diagram of an electronic device 300 provided in an embodiment of the present application, Figure 6B for Fig. 6A Schematic diagram of the rear structure of the electronic device in FIG. The electronic device 300 may be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, a smart bracelet, etc.), an augmented reality (AR) device, a virtual reality (VR) device, a vehicle-mounted device, etc., and this application does not limit this. This embodiment is described by taking the electronic device 300 as a mobile phone as an example.

[0053] The electronic device 300 may include a housing 31 assembled on the outside of the electronic device, and a circuit board (not shown) located inside the housing 31. The electronic device 300 may also include a display module 32, which is connected to the housing 31, and specifically, the display module 32 may be mounted on the housing 31. The housing 31 includes a back cover 311 assembled on the back side of the electronic device 300. The back cover 311 may only cover the back side of the electronic device 300 (i.e., the side away from the display module 32), or may cover the back side and side frame of the electronic device 300 at the same time. In the embodiment of the present application, the back cover 311 may be made of the above-mentioned glass product 200 of the embodiment of the present application, may be made of the above-mentioned glass product 200 in its entirety, or may be made of the above-mentioned glass product 200 only partially. When the back cover 311 is made of the above-mentioned glass product 200, the ink layer 40 of the glass product 200 faces the display module 32, and the anti-fingerprint layer 30 faces away from the display module 32.

[0054] In some implementation modes of the present application, Figure 6B As shown, the electronic device 300 also includes a camera assembly 33 located inside the housing 31. The housing may include a camera protection cover 312. The camera protection cover 312 is covered on the camera assembly 33 to protect the camera assembly 33. The camera protection cover 312 can be made of the above-mentioned glass product 200 in the embodiment of the present application. Specifically, it can be made entirely of the above-mentioned glass product 200 or only partially of the above-mentioned glass product 200.

[0055] The back cover 311 of the electronic device 300 and / or the camera protection cover 312 can adopt the above-mentioned glass product 200 of the embodiment of the present application, which can have good wear resistance, mechanical strength and a gorgeous appearance with color tones, thereby making the market competitiveness of the electronic device outstanding.

[0056] The technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0057] Example 1

[0058] A glass product having a structure such as Figure 2 As shown, it includes a glass substrate 10 with a thickness of 0.55 mm; a superhard film 20 is disposed on the first surface 101 of the glass substrate 10, with a total thickness d2 of 640 nm, which is specifically 6 layers of film formed by alternating silicon nitride layers and SiO2 layers, wherein the silicon nitride layers and the SiO2 layers have 3 layers each, and the SiO2 layer is directly attached to the glass substrate 10. A brightness enhancement film 50 is disposed on the second surface 102 of the glass substrate 10, with a total thickness d1 of 440 nm, which is specifically 4 layers of film formed by alternating Nb2O5 layers and SiO2 layers, wherein the Nb2O5 layers and the SiO2 layers have 2 layers each, and the Nb2O5 layer is directly attached to the glass substrate 10.

[0059] In addition, in Example 1, the visible light transmittance of the superhard film 20 is 62%, and the reflectivity of the brightness enhancement film 50 is 35%. d1 / d2=0.68.

[0060] Example 2

[0061] The difference between the glass product of Example 1 is that the ratio of the total thickness d1 of the brightness enhancement film 50 to the thickness d2 of the superhard film 20 is 0.4. In the glass product of Example 2, the total thickness d2 of the superhard film is 850nm, and the total thickness d1 of the brightness enhancement film 50 is 340nm. The number of layers and the film layer structure of the two are the same as those of Example 1.

[0062] Example 3

[0063] The difference between the glass product of Example 1 is that the ratio of the total thickness d1 of the brightness enhancement film 50 to the thickness d2 of the superhard film 20 is 0.9. In the glass product of Example 3, the total thickness d2 of the superhard film is 600nm, and its film layer structure is the same as that of Example 1; the total thickness d1 of the brightness enhancement film 50 is 540nm, and it is specifically 9 layers of film layers formed by alternating stacking of Nb2O5 layers and SiO2 layers, wherein there are 4 Nb2O5 layers and 5 SiO2 layers, and the SiO2 layer is directly attached to the glass substrate 10.

[0064] Example 4

[0065] The difference between the glass product of Example 1 is that the ratio of the total thickness d1 of the brightness enhancement film to the thickness d2 of the superhard film is specifically 0.29, which is less than 0.4. In the glass product of Example 4, the total thickness d1 of the brightness enhancement film 50 is 187nm, and it is specifically 7 layers of Nb2O5 layers and SiO2 layers stacked alternately, wherein there are 3 Nb2O5 layers and 4 SiO2 layers, and the SiO2 layer is directly attached to the glass substrate 10.

[0066] Example 5

[0067] The difference from the glass product of Example 1 is that the brightness enhancement film 50 is a 4-layer film formed by alternating Ti3O5 layers and SiO2 layers, with 2 Ti3O5 layers and 2 SiO2 layers respectively, and the Ti3O5 layer is directly attached to the glass substrate 10. The total thickness d1 of the brightness enhancement film 50 is 271 nm. d1 / d2=0.42.

[0068] In order to highlight the beneficial effects of the present application, the following comparative examples are set.

[0069] Comparative Example 1

[0070] A glass product, specifically the glass substrate used in Example 1, has no film layer disposed on its surface.

[0071] Comparative Example 2

[0072] A glass product having a structure such as Figure 1 As shown, it includes a glass substrate 10 (same as in Example 1), one side of the glass substrate 10 is provided with a superhard film 20, the total thickness of which is 1100nm, which is specifically 10 layers of film formed by alternating stacking of silicon nitride layers and SiO2 layers, wherein the silicon nitride layers and the SiO2 layers each have 5 layers, and the SiO2 layer is directly attached to the glass substrate 10. The visible light transmittance of the superhard film is 53%.

[0073] In order to provide favorable support for the beneficial effects of the present application, the following performance tests were performed on the glass products of the above embodiments and comparative examples:

[0074] a. Hardness test: The surface of the glass product to be tested is scratched by a pyramidal diamond needle using a scratch method (for each embodiment and comparative example 2, specifically scratching its superhard film), and the depth of the scratch is measured. The depth of the scratch is the Mohs hardness.

[0075] The results show that the Mohs hardness of the superhard film in the glass products of each embodiment and comparative example 2 can reach 8, while the Mohs hardness of the pure glass substrate (comparative example 1) is only 5.

[0076] b. Wear resistance test:

[0077] The test equipment is: vibration wear resistance instrument R180 / 530TE 30 (equipment frequency: 50±0.5HZ, amplitude: 1.65±0.1mm). 15 liters of mixed abrasive are used: including 3 parts by volume of RKF 10K (yellow cylindrical abrasive particles) and 1 part by volume of RKK 15P (green cone abrasive particles).

[0078] Test sample preparation: The glass products of each embodiment and comparative example are fixed together with a 200g counterweight (for each embodiment and comparative example 2, the counterweight is set on the side of the glass substrate away from the superhard film) to form a simulated prototype, and the simulated prototype is placed in a vibration wear tester for testing. Each vibration wear tester can be placed with a maximum of 2 simulated prototypes to avoid collision.

[0079] The test process is as follows: (1) Pour 1L of water evenly into the vibration tank of the vibration wear-resistant instrument containing the above-mentioned abrasive to keep the abrasive wet, and then evenly pour 200mL of detergent (the detergent is commercially available from Germany) (2) The test sample is numbered and placed in a vibration tank filled with mixed abrasives, with the simulated sample head facing upwards, ensuring that at least half of the simulated sample is immersed in the abrasives; start the vibration wear-resistant instrument as the timing zero point. After 30 minutes, take out the test sample, clean it, check the appearance of the sample, and take photos; (3) Pour about 500 mL of water evenly into the vibration tank to ensure that the abrasive remains moist, repeat step (2), and take out the sample at 60 minutes, 90 minutes, 90 minutes, and 120 minutes for observation and photo recording.

[0080] The results show that after 120 minutes (i.e. 2 hours) of wear resistance test, there is no obvious wear and dents on the large surfaces and corners of the glass products of each embodiment and comparative example 2, and the film layer does not fall off or leak, which indicates that the ultra-hard film in the glass product has good wear resistance, while the surface of the glass product of comparative example 1 has serious scratches.

[0081] c. Glass strength test:

[0082] The glass strength is tested based on the four-point bending test method, as shown in the schematic diagram Figure 7 The test method includes the following steps:

[0083] ① Process each glass product into a 3D curved surface sample, and check the appearance of each glass sample before testing to ensure that the product has no cracks, gaps or other defects that affect strength;

[0084] ② Check and clean the support (located below the lower support roller) and the upper pressure roller of the strength tester, and ensure that the upper and lower rollers are clean and there are no serious scratches on the surface;

[0085] ③ Fix the test sample with a four-point bending test fixture so that it is located between the upper pressure roller and the lower support roller, and in the middle of the two lower support rollers (such as Figure 7 As shown); the measurement direction of the test sample and the selection of the upper and lower rollers are as follows: 3D curved surface products: measure the Y-axis direction (product length direction), the diameters of the lower support roller and the upper pressure roller are both 6mm;

[0086] ④ Set the preload, generally 1-2N, to ensure that the test sample is in contact with the upper and lower rollers;

[0087] ⑤Set the pressing speed of the load: 10mm / min;

[0088] ⑥ Start the test instrument and begin to apply the bending load. Continue to apply the bending load at a downward pressure speed of 10 mm / min until the test sample breaks. Record the maximum load value applied during the test, which is the maximum load F corresponding to the moment when the sample breaks.

[0089] ⑦ Calculate the bending strength according to the following formula:

[0090] σ=3F×(Ls-Lb) / (2B×H2)

[0091] Where, σ represents the bending strength of the test sample, in MPa;

[0092] F represents the maximum load corresponding to the rupture of the test sample, in N;

[0093] Ls represents the distance between the center lines of the two lower support rollers, in mm; in this application, Ls is 40 mm;

[0094] Lb represents the distance between the center lines of the two upper pressing rollers, in mm; in this application, Lb is 20 mm;

[0095] B represents the width of the test sample (parallel to the extension direction of each roller), in mm;

[0096] H represents the thickness of the test sample in mm.

[0097] ⑧ Five parallel samples were tested in each group, and the average value of the five bending strengths was taken. The test results are shown in Table 1 below.

[0098] Table 1

[0099]

[0100]

[0101] It can be seen from Table 1 that the bending strength of the glass product in Comparative Example 2, in which a superhard film is set on one side of the glass substrate, is seriously reduced by about 30.1% compared with the glass substrate (Comparative Example 1). However, after the embodiment of the present application sets a superhard film on one side of the glass substrate and a brightness enhancement film on the opposite side, the bending strength of the obtained glass product is still relatively high, which is only less than 20% lower than the bending strength of the glass substrate. Among them, the bending strength of the glass products in Examples 1-5 is reduced by 8.48%, 11.17%, 5.81%, 19.09%, and 9.69% respectively compared with the bending strength of the glass substrate. From the comparison between Examples 1-4, it can be seen that when the ratio of the thickness d1 of the brightness enhancement film in the glass product to the thickness d2 of the superhard film is less than 0.4 (such as the ratio is 0.29 in Example 4), the percentage of strength reduction of the glass product compared with the glass substrate will be relatively high.

[0102] In addition, the reflectivity test of the glass products of Example 2 and Example 1 was conducted. Specifically, white light was irradiated from the side of the superhard film, and the angle between the incident angle of the white light and the normal direction of the superhard film was controlled to be 10°. The measured reflection curves were as follows: Fig. 8A , Figure 8B shown.

[0103] from Fig. 8A , Figure 8B It can be known that the glass product of Example 2 with a single-sided superhard film and the glass product of Example 1 with an external superhard film and an internal brightening film can achieve substantially the same Lab chromaticity coordinate value (in the Lab chromaticity coordinates of Example 2, the a value is 12.18, the b value is 28.37, and the L value is 69.47; in the Lab chromaticity coordinates of Example 1, the a value is 12.18, the b value is 28.40, and the L value is 69.47), and the reflection curve of the glass product of Example 1 is smoother, which reflects that its color stability is better. It should be noted that when the two achieve a similar color effect, the thickness of the superhard film itself in Example 2 is 1100nm, while the thickness of the superhard film in Example 1 of the present application is only 640nm, and the total thickness of the superhard film and the brightening film is 1080nm. It can be seen that when the glass product with a single-sided superhard film in the comparative example reaches the same brightness / color as the glass product of the present application, the thickness of the superhard film in the present application embodiment is significantly lower, which is more conducive to color adjustment.

[0104] In addition, the glass products of Examples 2-5 also have substantially the same color effects as that of Example 1, and their reflection curves are similar.

[0105] According to the above results, the glass product provided in the embodiment of the present application has a super-hard film on one side and a brightness enhancement film on the other side on the opposite sides. The glass product can have good wear resistance without a significant reduction in strength and still has excellent mechanical properties. At the same time, the thickness of the super-hard film in the glass product is relatively low, which is convenient for adjusting the appearance color of the glass product.

[0106] The above is an exemplary embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made thereto without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0107] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" in this application should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0108] The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0109] In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. In addition, the numerical range represented by "to" in this specification refers to the range including the numerical values ​​recorded before and after "to" as the minimum value and the maximum value, respectively. In the drawings, units with similar or identical structures are represented by the same reference numerals.

Claims

1. A glass product, characterized in that: The glass product includes a glass substrate having a first surface and a second surface disposed opposite to each other, wherein a superhard film is disposed on the first surface, and a brightness enhancement film is disposed on the second surface; the reflectivity of the brightness enhancement film is greater than or equal to 25%, and the transmittance of the superhard film is greater than or equal to 50%.

2. The glass product according to claim 1, characterized in that The thickness d1 of the brightness enhancement film and the thickness d2 of the superhard film satisfy the following relationship: 0.4d2≤d1<d2.

3. The glass product according to claim 1, characterized in that: The thickness of the superhard film is greater than or equal to 600 nm.

4. The glass product according to claim 1, characterized in that The pencil hardness of the brightness enhancement film is above 5H.

5. The glass product according to claim 1, characterized in that: The pencil hardness of the superhard film is 9H; the Mohs hardness of the superhard film is above 7.

6. The glass product according to claim 1, characterized in that: The brightness enhancement film comprises a laminated structure formed by alternatingly stacking a first high refractive index material layer and a first low refractive index material layer; wherein the refractive index of the first high refractive index material layer is greater than or equal to 2.0, and the refractive index of the first low refractive index material layer is less than or equal to 1.

55.

7. The glass product according to claim 6, characterized in that The first high refractive index material layer includes one of a niobium pentoxide layer, a titanium dioxide layer, a titanium pentoxide layer, a niobium nitride layer or a titanium boride layer; the first low refractive index material layer includes one of a silicon dioxide layer, an aluminum oxide layer or a magnesium fluoride layer.

8. The glass product according to claim 7, characterized in that The first high refractive index material layer is a niobium pentoxide layer, and the first low refractive index material layer is a silicon dioxide layer.

9. The glass product according to claim 6, characterized in that: The brightness enhancement film further includes an indium layer, and the indium layer is located between any adjacent first high refractive index material layer and first low refractive index material layer.

10. The glass product according to claim 1, characterized in that The superhard film includes a laminated structure formed by alternating stacking of a first superhard high refractive index material layer and a second low refractive index material layer; wherein the refractive index of the first superhard high refractive index material layer is greater than or equal to 1.65, and the refractive index of the second low refractive index material layer is less than or equal to 1.

55.

11. The glass product according to claim 10, characterized in that The first superhard high refractive index material layer includes one of a silicon nitride layer, a zirconium dioxide layer, an aluminum nitride layer, a silicon oxynitride layer, or an aluminum oxynitride layer; and the second low refractive index material layer includes a silicon dioxide layer or an aluminum oxide layer.

12. The glass product according to claim 11, characterized in that The first superhard high refractive index material layer is a silicon nitride layer, and the second low refractive index material layer is a silicon dioxide layer.

13. The glass product according to any one of claims 1 to 12, characterized in that: An anti-fingerprint layer is also provided on the side of the superhard film away from the glass substrate; an ink layer is also provided on the side of the brightness enhancement film away from the glass substrate.

14. The glass product according to claim 13, characterized in that The glass product further comprises a supporting film, wherein the supporting film is located between the brightness enhancement film and the ink layer, or between the glass substrate and the brightness enhancement film.

15. The glass product according to claim 1, characterized in that The bending strength of the glass product measured by a four-point bending test method is reduced by less than 20% compared with the bending strength of the glass substrate.

16. The glass product according to claim 2, characterized in that The bending strength of the glass product measured by a four-point bending test method is reduced by less than 15% compared with the bending strength of the glass substrate.

17. The glass product according to claim 16, characterized in that The bending strength of the glass product is above 510 MPa.

18. The glass product according to claim 1, characterized in that A simulated prototype consisting of the glass product and a 200g counterweight is placed in a vibration wear tester filled with abrasive particles, and more than half of the body of the simulated prototype is kept immersed in the abrasive particles. The wear test is carried out at a vibration frequency of 5050±0.5HZ for more than 120min. There is no obvious wear and scratch on the surface of the glass product.

19. The glass product according to claim 1, characterized in that The thickness of the glass product is 0.05 mm-0.2 mm, and the bending radius of the glass product is ≤5 mm.

20. The glass product according to claim 19, characterized in that Based on a four-point bending test method, when a bending load of ≥300N is applied to the glass article, the glass article does not break.

21. An electronic device, characterized in that: It comprises a shell assembled on the outside of the electronic device, and a circuit board located inside the shell, wherein the shell comprises the glass product according to any one of claims 1 to 20.

22. The electronic device according to claim 21, characterized in that: The housing comprises a back cover assembled on the back side of the electronic device, and the back cover is made of the glass product.

23. The electronic device according to claim 22, characterized in that: The electronic device further comprises a camera assembly located inside the housing, the housing comprises a camera protection cover, the camera protection cover is disposed on the camera assembly, and the camera protection cover is made of the glass product.

Images