Glass cover plate and display screen and terminal including the same

Abstract

The utility model discloses a glass cover plate and a display screen and a terminal including the glass cover plate. The glass cover plate comprises a glass substrate, a silicon dioxide layer arranged on the surface of the glass substrate, an optical buffer layer arranged on the silicon dioxide layer, a multilayer antireflection film arranged on the optical buffer layer, and a protective layer arranged on the multilayer antireflection film, wherein the thickness of the optical buffer layer is in the range of 10nm to 100nm, and the optical buffer layer adopts an organic polymer compound. A silicon dioxide layer is arranged on the surface of the glass substrate for primer to increase the adhesion of the antireflection film, an optical buffer layer arranged on the silicon dioxide layer plays a role of stress release and thus improves the strength of the entire product, a multilayer antireflection film arranged on the optical buffer layer improves the transmittance of the product, and a protective layer on the multilayer antireflection film improves the anti-pollution ability to ensure the surface cleanliness.

Description

Technical Field

[0001] The utility model relates to the technical field of glass products, in particular to a glass cover plate and a display screen and a terminal comprising the glass cover plate. Background Art

[0002] In order to improve customer experience, a layer of AR (Anti-Reflective) is usually added to the panel glass of mobile phones and tablets to reduce or eliminate the reflection of light on the surface. By reducing the reflectivity, the AR layer can improve light transmittance, reduce glare and reflection, improve display effects, and enhance optical transparency and viewing experience. However, after some lenses or cover plates are electroplated with an AR layer, the strength of the entire glass cover plate decreases significantly, and the adhesion is also unstable.

[0003] Based on this, a new solution is needed. Utility Model Content

[0004] The main purpose of the utility model is to provide a glass cover plate with high strength and stable adhesion, and a display screen and a terminal comprising the glass cover plate, in order to solve the problem that the strength of the existing glass cover plate decreases and the adhesion is unstable after the AR layer is electroplated.

[0005] To achieve the above-mentioned purpose, the utility model provides a glass cover plate, comprising a glass substrate, a silicon dioxide layer arranged on the surface of the glass substrate, an optical buffer layer arranged on the silicon dioxide layer, a multilayer anti-reflection film arranged on the optical buffer layer, and a protective layer arranged on the multilayer anti-reflection film, wherein the thickness of the optical buffer layer is in the range of 10nm to 100nm, and the optical buffer layer adopts an organic polymer compound.

[0006] In the glass cover provided by the utility model, the optical buffer layer is selected from one of polyamide-imide, polyetheretherketone, polyphenylene sulfide and polytetrafluoroethylene.

[0007] In the glass cover plate provided by the utility model, the thickness of the silicon dioxide layer is in the range of 6nm to 200nm.

[0008] In the glass cover provided by the utility model, the protective layer is an anti-fingerprint film or a waterproof film.

[0009] In the glass cover provided by the utility model, the thickness of the protective layer is in the range of 5nm to 40nm.

[0010] In the glass cover provided by the utility model, the thickness of the multi-layer antireflection film is in the range of 200nm to 500nm.

[0011] In the glass cover provided by the present invention, the number of film layers of the multi-layer antireflection film is 4 to 8.

[0012] In the glass cover provided by the utility model, the multi-layer antireflection film is selected from titanium pentoxide and silicon dioxide.

[0013] The utility model also provides a display screen, comprising a display screen module and the above-mentioned glass cover plate covering the display screen module.

[0014] The utility model also provides a terminal comprising the glass cover plate as described above.

[0015] The glass cover provided by the utility model has the following beneficial effects: the glass cover provided by the utility model increases the adhesion of the anti-reflection film by arranging a silicon dioxide layer on the surface of the glass substrate for primer, releases stress through an optical buffer layer arranged on the silicon dioxide layer to thereby improve the strength of the entire product, improves the transmittance of the product through a multi-layer anti-reflection film arranged on the optical buffer layer, and improves the anti-pollution ability through a protective layer on the multi-layer anti-reflection film to ensure surface cleanliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work:

[0017] Figure 1 The figure is a schematic structural diagram of a glass cover provided by an embodiment of the utility model;

[0018] Figure 2 Shown is the relationship between the optical buffer layer thickness and the thrust;

[0019] Figure 3 Shown is the relationship between the optical buffer layer thickness and 4PB;

[0020] Figure 4 and Figure 5 Shown is the relationship between the optical buffer layer thickness and the intensity;

[0021] Figure 6 Shown is the relationship between OBF thickness, adhesion and transmittance;

[0022] Figure 7 Shown is the slice analysis result of the contact surface between OBF and material;

[0023] Figure 8 Shown are the results of the effect of adding an overcoat (AF) layer on adhesion. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Typical embodiments of the utility model are given in the drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The general idea of ​​the utility model is: in view of the problem that the strength of the existing glass cover plate decreases and the adhesion is unstable after the AR layer is electroplated, the utility model provides a glass cover plate with high strength and stable adhesion, by setting a silicon dioxide layer on the surface of the glass substrate for primer to increase the adhesion of the anti-reflection film, by setting an optical buffer layer on the silicon dioxide layer to release stress and thus improve the strength of the entire product, by setting a multi-layer anti-reflection film on the optical buffer layer to improve the transmittance of the product, by the protective layer on the multi-layer anti-reflection film to improve the anti-pollution ability to ensure the surface cleanliness. In the prior art, the anti-reflection film layer is directly electroplated behind the cover plate, and the strength of the glass will be greatly reduced, with a reduction of about 40-50%. The present application ensures low attenuation of the strength of the glass product by adding silicon oxide and an optical buffer layer on the glass substrate, then setting an anti-reflection film, and then setting a protective layer on the anti-reflection film, which can retain 70-80% of the strength of the restored white film, or even higher.

[0027] In order to better understand the above-mentioned technical scheme, the above-mentioned technical scheme will be described in detail below in combination with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the utility model and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the utility model and the technical features in the embodiments can be combined with each other.

[0028] Figure 1 The figure is a schematic diagram of the structure of a glass cover provided by an embodiment of the present invention. Figure 1As shown, the glass cover provided by the utility model can be used in electronic products such as mobile phones, tablet computers, smart wearables, etc., including a glass substrate 110, a silicon dioxide layer 120 arranged on the surface of the glass substrate 110, an optical buffer layer (Optical buffer film, OBF) 130 arranged on the silicon dioxide layer 120, a multilayer anti-reflection film 140 arranged on the optical buffer layer 130, and a protective layer 150 arranged on the multilayer anti-reflection film 140.

[0029] Specifically, in one embodiment of the utility model, the silicon dioxide layer 120 is used as the bottom layer of the entire film layer, which can improve the adhesion of the anti-reflection film on the surface of the glass cover plate. Since silicon dioxide has good chemical stability, hardness and excellent adhesion, it can effectively improve the bonding force of the entire film layer. Therefore, by forming a layer of silicon dioxide film on the surface of the glass cover plate, the adhesion of the anti-reflection film can be improved and its performance can be improved. If the thickness of the silicon dioxide layer is too thin, it may cause insufficient adhesion and easy peeling or falling off; if the thickness of the silicon dioxide layer is too thick, it will affect the optical properties of the anti-reflection film. Therefore, in this embodiment, the thickness of the silicon dioxide layer is usually in the range of 6nm to 200nm, which can effectively realize the combination of the anti-reflection film and the substrate, and is conducive to achieving optical performance. By controlling the thickness of the silicon dioxide layer, the optical properties of the film layer can be adjusted, the transmittance can be improved and the reflectivity can be reduced, thereby realizing the function of the anti-reflection film.

[0030] Specifically, in one embodiment of the utility model, the optical buffer layer 130 uses an organic polymer compound to play a role in stress release, helping to reduce the pressure or stress applied to the product by the outside world, so as to greatly improve the strength of the entire product, such as beading, thrust, 4PB capacity, etc. The thickness of the optical buffer layer will also directly affect its optical performance and adhesion. An overly thick optical buffer layer may cause a decrease in optical transmittance, while increasing the stress inside the film layer and affecting the adhesion; on the contrary, an overly thin optical buffer layer may not be able to effectively play its stress release and reinforcement role, affecting the overall performance of the product. Therefore, in this embodiment, the thickness of the optical buffer layer is in the range of 10nm to 100nm. Appropriate thickness can effectively absorb and disperse external stress, avoid damage to the product structure, and thus improve the overall strength and durability of the product. By reasonably selecting the thickness, the strength and stability of the product can be effectively increased to ensure that the product is not easily damaged by external influences during use.

[0031] Further, in one embodiment of the utility model, the optical buffer layer 130 is selected from one of polyamide-imide, polyetheretherketone, polyphenylene sulfide and polytetrafluoroethylene. Polyamide-imide has excellent mechanical properties, including high strength, high modulus and excellent heat resistance; polyetheretherketone has excellent mechanical properties, including high strength, hardness and wear resistance; polyphenylene sulfide has excellent chemical resistance and thermal stability, and has high strength and stiffness; polytetrafluoroethylene has a low friction coefficient, excellent chemical stability and unique non-adhesive properties. In applications under high strength, high stress or special environments, using one of the above materials as an optical buffer layer can improve mechanical properties such as tensile resistance and compression resistance, thereby enhancing the material's stress bearing capacity.

[0032] Further, in one embodiment of the utility model, the antireflection film 140 includes a multilayer film layer of titanium pentoxide and silicon dioxide alternately arranged, for example, the first layer is a silicon dioxide layer, the second layer is a titanium pentoxide layer, the third layer is a silicon dioxide layer, the fourth layer is a titanium pentoxide layer, and so on. By utilizing the difference in refractive index of different materials, the interference effect of light waves can be achieved, thereby suppressing reflection and enhancing transmittance. Through the design of such a multilayer film layer, a wavelength-selective optical film can be formed, so that light of a specific wavelength interferes between the film layers and produces an extinction effect, thereby reducing reflection and improving transmittance.

[0033] Furthermore, in one embodiment of the utility model, in order to achieve a good anti-reflection effect while minimizing the complexity and cost of preparation, the number of film layers of the multilayer anti-reflection film is usually between 4 and 8 layers. By increasing the number of film layers, the interference effect of light can be more effectively controlled, thereby achieving higher anti-reflection performance. As the number of film layers increases, the anti-reflection effect is usually better, but too many film layers may also lead to increased optical losses or increased difficulty in preparation; light of different bands corresponds to different wavelengths, and the selection of the number of film layers needs to consider the band range to be covered by the target optical device to ensure good anti-reflection performance throughout the band; the increase in the number of film layers will increase the complexity and cost of the preparation process, so it is necessary to strike a balance between improving performance and controlling costs. Usually, the number of film layers of 4 to 8 layers can meet most anti-reflection requirements and strike a balance between performance and cost.

[0034] Furthermore, in one embodiment of the utility model, in order to achieve the effect of reducing reflection and enhancing transmittance, the thickness of the multilayer anti-reflection film is in the range of 200nm to 500nm. The thickness of the anti-reflection film is usually in a specific proportion to the wavelength of light to achieve the interference effect on light of a specific wavelength. By precisely controlling the thickness, the anti-reflection effect on light in different wavelength ranges can be achieved. The thickness determines the optical path difference between different film layers, thereby affecting the intensity and nature of the interference effect. The appropriate thickness can cause constitutive interference of light waves in the film layer to achieve the best anti-reflection effect. The thickness range needs to take into account the actual preparation technology and process conditions to ensure the uniformity and stability of the film layer. Therefore, the thickness range of 200 nanometers to 500 nanometers can achieve the anti-reflection effect while maintaining a balance between preparation difficulty and cost.

[0035] Furthermore, in one embodiment of the utility model, the optical film layer is usually not protected after the cover plate is made. However, if the protective material is not applied, it has been verified through a large number of tests that when the product is boiled in water, the optical film layer is easy to lose the coating in a harsh boiling water environment. Therefore, in the present application, a layer of anti-fingerprint film or waterproof film is set on the anti-reflection film layer as a protective layer, so that water cannot penetrate into the anti-reflection film during the boiling water test, and the anti-reflection film is protected from being corroded by the harsh environment of high temperature and high humidity; at the same time, since the surface of the plated protective layer is smooth, the bottom of the hundred-grid glue after boiling water is tested is relatively smooth, and the hundred-grid glue is not easy to carry the film layer, so some boiling water hundred-grid tests that could not pass before can be easily passed. In addition, the protective layer is attached to the surface of the anti-reflection film layer, which can better protect the anti-reflection film from being contaminated by dirt or dust spots, improve the surface cleanliness of the product, and the appearance yield is improved to a certain extent. At the same time, the product grade is also greatly improved.

[0036] Further, in one embodiment of the utility model, the thickness of the protective layer is in the range of 5nm to 40nm. If the thickness of the protective layer is too thin, it may not provide sufficient physical barriers to effectively prevent the penetration of moisture or fingerprints, thereby reducing the effectiveness of the protective layer; therefore, in order to ensure the function and stability of the protective film, to ensure that the product is effectively protected and the surface performance is improved in harsh environments such as boiling water, the thickness of the protective layer of the present application is greater than 5nm. A thicker protective layer will have a greater impact on optical properties, including transmittance, reflectivity, etc., which may reduce the optical transparency and clarity of the product and affect its use effect; at the same time, the production of thicker films may require higher cost materials, which may increase the manufacturing cost of the product; therefore, in this embodiment, in order to balance the protective effect, optical performance, physical stability and production cost, the thickness of the protective film is limited to less than 40 nanometers, which can ensure that the product obtains sufficient protection effect, while avoiding unnecessary optical and physical performance problems, and is also conducive to controlling manufacturing costs.

[0037] The utility model also provides a display screen, which includes Figure 1 The glass cover plate and the display screen module shown, the glass cover plate covers the display screen module. Specifically, in the embodiment of the utility model, the display screen can be a touch display screen.

[0038] The utility model also provides a terminal, which includes Figure 1 The glass cover shown. The terminal includes but is not limited to mobile phones, tablet computers, smart wearable products and other products that require the use of glass cover.

[0039] The glass cover plate of the present invention is prepared by the following method in combination with the electroplating process in Table 1:

[0040] The UNIVAC2050 evaporator was used as the electroplating equipment, and the initial vacuum degree of electroplating was set to 4.0*10 - 5 Torr, the vacuum degree of the upper optical buffer layer is set to 2.0*10 -5 Torr, the chamber temperature of the machine was set to 50 degrees; after about 35 minutes of vacuuming, the machine began to clean the ion source, using the Hall ion source, where the voltage was set to 120V and the current was set to 6mA; after the ion source bombarded the surface of the glass cover for 8 minutes, the vacuum was continued, and when the vacuum reached 2.0*10 -5 Torr, start to deposit the first layer of silicon oxide (10 nanometers) as the base layer of the entire film layer; after the first layer of silicon oxide is applied, clean the ion source for 30 seconds, evacuate and wait, and continue to evacuate for about 20 minutes; wait until the vacuum degree reaches 2.0*10 -5 Torr, the machine starts to apply the medicine for electroplating the optical buffer layer at a rate of 6, wherein the power of the electron gun preheating in the first stage is set to 1.5% of the maximum power, and the second stage is set to 2% of the maximum power. The ion source cannot be cleaned during the medicine application process; after applying the first medicine, the ion source is bombarded for 15 seconds. After the bombardment is completed, continue to pump and wait for 2 minutes, and then repeat the electroplating of the second medicine; after the electroplating, the ion source is bombarded for 15 seconds, and after waiting for 5 minutes, the electroplating of the anti-reflection film layer begins. The anti-reflection film layer is assisted by the ion source throughout the process; after applying the anti-reflection film layer, start applying the protective layer directly. Be careful not to apply silicon oxide to avoid affecting the optical penetration and color of the anti-reflection film.

[0041] In the process of electroplating the buffer tank, anti-reflection film and protective layer, in order to avoid the electroplated protective layer causing the dyne value of the ink surface to be too small, a copper plate fixture or protective film should be used to shield the electroplating. The protective layer only needs to be electroplated into the anti-reflection film hole and cannot affect the dyne value of the ink area. During the production process, when picking up the pot and removing the oil stains on the protective layer, try to avoid the ink area being contaminated by oil stains, and try to use inks with high dyne values. For products that have been plated with a bottom protective layer, the subsequent process is not allowed to bombard the bottom anti-reflection film area of ​​the product with an ion source to avoid failure of the protective layer.

[0042] Table 1

[0043]

[0044] Figure 2 Shown is the relationship between the optical buffer layer thickness and the thrust; Figure 3 The relationship between the optical buffer layer thickness and 4PB is shown. Figure 2 and Figure 3 It can be seen that after the prior art solution only electroplated the anti-reflection film (AR) layer, the thrust and 4PB strength of the lens decreased by about 40-50%; after the optical buffer layer (OBF) was added in the present application, the thrust and 4PB were still attenuated relative to the white film, but were significantly improved over the prior art solution. As the OBF thickness increased, the strength became closer and closer to the white film. When the OBF thickness was 16.2nm, the strength was about 70% of the white film. When the OBF thickness reached 35nm, the strength could be restored to 80-90% of the white film.

[0045] Figure 4 and Figure 5 The figure shows the relationship between the thickness and strength of the optical buffer layer. The strength test is carried out through a ball smashing experiment. During the electroplating OBF process: the OBF density is set to 1.0gm / cc, the OBF process is not ion-assisted and heated, and the ion bombardment is performed for 30 seconds after plating, with a power of 110V / 7A. Figure 4 It can be seen that the ball drop height is significantly improved by OBF treatment before AR electroplating, but the strength is reduced by 30-40% relative to white glass (not AR plated); after the OBF thickness is increased from the original 20nm to 40nm, the ball drop height does not change significantly.

[0046] Figure 6 The figure shows the relationship between the thickness, adhesion and transmittance of OBF, where the density of OBF is set to 1.8gm / cc, and OBF is not ion-assisted or heated throughout the process. After plating, the ion bombardment is performed for 30 seconds at a power of 110V / 8A. For the structure of OBF+AR, as the thickness of OBF increases, the wrinkles of the film layer become more and more serious. When the thickness reaches 45 nanometers, the wrinkles are very obvious, and the transmittance decreases by about 1% on average. When the thickness of OBF is further increased, the actual slice is 70nm, and the thickness displayed by the machine is above 127nm, the adhesion of OBF fails, and the transmittance also fails; as the thickness of OBF increases, the wrinkles become more and more obvious, and the ratio of actual thickness / machine thickness becomes larger and larger. When the thickness is two or less, the actual thickness is about 40% of the thickness displayed by the machine. When it is too thick, the thickness ratio becomes higher due to the influence of wrinkles.

[0047] Figure 7 The following is the slice analysis result of the contact surface between OBF and material. Figure 7As shown, when the OBF thickness exceeds 2 pills, the film layer will wrinkle. The OBF surface contacts silicon oxide and titanium oxide. Relatively speaking, the wrinkles of titanium oxide are relatively small. It is preferred that titanium oxide contacts OBF better.

[0048] Figure 8 The figure shows the effect of adding a protective layer (AF) on adhesion. Figure 8 As shown, when the OBF thickness is 2 pills (thickness is about 20), adding AF primer is very helpful for boiling water. Adding AF primer, boiling water is OK, and the boiling water is 100% OK in the process of doing 7 consecutive DOEs and subsequent 2 consecutive pots of OBF strength verification, including the upper, middle and lower positions of the pot.

[0049] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0050] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various utility model aspects, in the above description of the exemplary embodiments of the utility model, the various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed method should not be interpreted as reflecting the following intention: the claimed utility model requires more features than the features explicitly stated in each claim. More specifically, as reflected in the following claims, the utility model aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the utility model.

[0051] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0052] It should be noted that the above embodiments illustrate the utility model rather than limit the utility model, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the existence of elements or steps not listed in the claims. The word "one" or "an" before an element does not exclude the existence of multiple such elements. The utility model can be implemented by means of hardware including several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices can be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names.

Claims

1. A glass cover plate, characterized in that: The invention comprises a glass substrate, a silicon dioxide layer arranged on the surface of the glass substrate, an optical buffer layer arranged on the silicon dioxide layer, a multilayer anti-reflection film arranged on the optical buffer layer, and a protective layer arranged on the multilayer anti-reflection film. The thickness of the optical buffer layer is in the range of 10nm to 100nm, and the optical buffer layer adopts an organic polymer compound.

2. The glass cover plate according to claim 1, wherein: The optical buffer layer is selected from one of polyamide-imide, polyetheretherketone, polyphenylene sulfide and polytetrafluoroethylene.

3. The glass cover plate according to claim 1, wherein: The thickness of the silicon dioxide layer is in the range of 6 nm to 200 nm.

4. The glass cover plate according to claim 1, wherein: The protective layer is an anti-fingerprint film or a waterproof film.

5. The glass cover plate according to claim 1, wherein: The thickness of the protective layer is in the range of 5nm to 40nm.

6. The glass cover plate according to claim 1, wherein: The thickness of the multilayer antireflection film is in the range of 200nm to 500nm.

7. The glass cover plate according to claim 6, wherein: The number of film layers of the multi-layer antireflection film is 4 to 8.

8. A display screen, characterized in that: It comprises a display screen module and a glass cover plate as claimed in any one of claims 1 to 7 covering the display screen module.

9. A terminal comprising the glass cover plate according to any one of claims 1 to 7.

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