CN108455829A - Curved glass and its preparation method, display screen and mobile terminal - Google Patents

Abstract

The invention provides curved glass, a preparation method of the curved glass, a display screen and a mobile terminal. The method comprises the following steps: providing flat glass, wherein two opposite surfaces of the flat glass are respectively provided with a first strengthening layer and a second strengthening layer; the predetermined area of the first reinforcing layer is thinned such that the thickness of the first reinforcing layer is less than the thickness of the second reinforcing layer. Therefore, a certain stress difference is generated between the first strengthening layer and the second strengthening layer of the predetermined area by enabling a certain thickness difference to exist between the predetermined area of the first strengthening layer and the second strengthening layer, and the stress difference can enable the flat glass to automatically bend towards one side of the second strengthening layer in the predetermined area, so that the curved glass is formed.

Description

Curved glass and its preparation method, display screen and mobile terminal

technical field

The invention relates to the technical fields of glass processing and electronic products, in particular, to curved glass and a preparation method thereof, a display screen and a mobile terminal.

Background technique

In the preparation process of electronic products, strengthened glass is essential, but as people have higher and higher requirements for the appearance of electronic products, they also like electronic devices with curved screens more and more, so when preparing electronic products, it is necessary to The glass used to prepare display screens has a certain curvature to form curved glass (such as 2.5D glass or 3D glass). At present, the production of 3D glass for mobile phones is mainly to place flat glass in a mold, heat, press and bend it, and then polish and strengthen it. However, this method still has many problems.

Therefore, the research on curved glass has been in-depth.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide a method for preparing curved glass with the advantages of simple preparation, high yield, energy saving, and low cost.

The present invention is based on the following knowledge and findings of the inventors:

The current method of preparing curved glass is: glass cutting→CNC (numerical control lathe processing)→polishing→hot bending→polishing→chemical strengthening. The polishing efficiency is low, the overall yield is not high and other shortcomings. In view of this technical problem, the inventor conducted in-depth research on the method of preparing curved glass and found that if the flat glass is chemically strengthened first to obtain a flat glass with a first strengthening layer and a second strengthening layer on two opposite surfaces, then Then the predetermined area of the first reinforcement layer is thinned, so that in the predetermined area, the first reinforcement layer and the second reinforcement layer have a thickness difference, and the difference in thickness will make the first reinforcement layer and the second reinforcement layer in the predetermined area There is a certain stress difference between them, and the stress difference will make the flat glass automatically bend on the side facing the second strengthening layer, thereby forming a curved glass, and the greater the thickness difference between the first strengthening layer and the second strengthening layer The greater the stress difference, the greater the curvature of the curved glass. In this way, those skilled in the art can prepare various curved glasses with different curvatures according to actual needs. In addition, the preparation method is simple and quick, and the yield is high. , low cost, no thermoforming, saving energy.

In view of this, in one aspect of the present invention, the present invention provides a method for preparing curved glass. According to an embodiment of the present invention, the method includes: providing flat glass, the two opposite surfaces of the flat glass respectively have a first strengthening layer and a second strengthening layer; thinning a predetermined area of the first strengthening layer to The thickness of the first reinforcement layer in the predetermined region is made smaller than the thickness of the second reinforcement layer. The inventors found that by thinning the predetermined area of the first reinforcement layer so that there is a certain thickness difference between it and the second reinforcement layer, the difference in thickness will make the difference between the first reinforcement layer and the second reinforcement layer in the predetermined area A certain stress difference is generated, and the stress difference will cause the flat glass to automatically bend on the side facing the second strengthening layer in a predetermined area, thereby forming a curved glass, and the thickness between the first strengthening layer and the second strengthening layer The greater the difference, the greater the stress difference and the greater the curvature. In this way, those skilled in the art can prepare curved glass with various curvatures according to actual needs. In addition, the preparation method is simple and quick, with high yield and low cost. , without thermoforming, saving energy.

According to an embodiment of the present invention, the thickness of the flat glass is 0.1-1.0 mm.

According to an embodiment of the present invention, the thickness of the first reinforcement layer is greater than 0 micrometers and less than or equal to 100 micrometers, and the thickness of the second reinforcement layer is greater than 0 micrometers and less than or equal to 100 micrometers.

According to an embodiment of the present invention, thinning the predetermined region of the first strengthening layer includes thinning the predetermined region of the first strengthening layer by polishing or etching.

According to an embodiment of the present invention, thinning the predetermined region of the first strengthening layer through the etching is performed through the following steps: forming a protective layer on the second strengthening layer; immersing the flat glass of layer in an etchant to thin the predetermined area of the first reinforcement layer; removing the protective layer.

According to an embodiment of the present invention, before immersing in the etching solution, a step of forming a protection pattern on the first reinforcement layer is further included.

According to an embodiment of the present invention, the thinned thickness of the first reinforcement layer is greater than or equal to 5 microns and less than or equal to 100 microns.

According to an embodiment of the present invention, the predetermined area is selected from the entire surface of the first reinforcement layer or the opposite side edges of the first reinforcement layer.

In another aspect of the present invention, the present invention provides a curved glass. According to an embodiment of the present invention, the curved glass is prepared by the aforementioned method. Therefore, the curved glass has high yield, good reliability, low preparation cost, simple preparation process and strong market competitiveness.

In yet another aspect of the present invention, the present invention provides a curved glass. According to an embodiment of the present invention, the curved glass includes: a glass body, at least a part of the glass body is configured as an arc segment; a strengthening layer, the strengthening layer is arranged on two opposite surfaces of the glass body; wherein , the thickness of the reinforcement layer outside the arc segment is smaller than the thickness of the reinforcement layer inside the arc segment. Thus, since the thickness of the strengthening layer on the outside of the arc segment is smaller than the thickness of the strengthening layer on the inside of the arc segment, the thickness difference will cause a stress difference between the two layers of strengthening layers arranged on the two opposite surfaces of the glass body, so that The glass body and the reinforced layer are automatically bent toward the side of the thicker reinforced layer, thereby forming a curved glass with an arc segment. Moreover, the greater the thickness difference between the two reinforced layers, the greater the stress difference, and the arc segment The greater the curvature, the skilled in the art can prepare curved glass with various curvatures according to actual needs. Further, the curved glass has a high yield and low manufacturing cost, and does not need hot pressing, which saves energy.

According to an embodiment of the present invention, the thickness difference of the reinforcing layer on the outside and inside of the arc segment increases as the curvature of the arc segment increases.

According to an embodiment of the present invention, the whole of the glass body is configured as the arc segment or the opposite side edges of the glass body are configured as the arc segment.

In yet another aspect of the present invention, the present invention provides a display screen. According to an embodiment of the present invention, the display screen includes the aforementioned curved glass. Therefore, the display screen has low manufacturing cost, high yield, beautiful appearance and strong market competitiveness. Of course, those skilled in the art can understand that the display screen has all the features and advantages of the above-mentioned curved glass, and details will not be repeated here.

In yet another aspect of the present invention, the present invention provides a mobile terminal. According to an embodiment of the present invention, the mobile terminal includes the aforementioned curved glass or the aforementioned display screen. Therefore, the mobile terminal has low manufacturing cost, high yield and strong market competitiveness. Of course, those skilled in the art can understand that the mobile terminal has all the features and advantages of the above-mentioned display screen or curved glass, and details will not be repeated here.

Description of drawings

Fig. 1 is a schematic flow chart of preparing curved glass in one embodiment of the present invention.

Fig. 2 is a schematic structural view of flat glass in another embodiment of the present invention.

Fig. 3 is a schematic flow chart of preparing curved glass in another embodiment of the present invention.

Fig. 4 is a schematic structural view of a curved panel glass according to yet another embodiment of the present invention.

Fig. 5 is a schematic structural view of a curved panel glass according to yet another embodiment of the present invention.

Fig. 6 is a schematic structural view of a curved panel glass according to yet another embodiment of the present invention.

Fig. 7 is a schematic structural view of a curved panel glass according to another embodiment of the present invention.

Fig. 8 is a schematic structural view of a curved panel glass according to yet another embodiment of the present invention.

Reference signs:

10: First strengthening layer 20: Second strengthening layer 30: Flat glass

40: Glass body 50: Strengthening layer

Detailed ways

Embodiments of the present invention are described in detail below. The embodiments described below are exemplary only for explaining the present invention and should not be construed as limiting the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The reagents or instruments used were not indicated by the manufacturer, and they were all commercially available conventional products.

In one aspect of the invention, the invention provides a method of making curved glass. According to an embodiment of the present invention, with reference to Fig. 1, the method includes:

S100: Provide a flat glass 30, the two opposite surfaces of the flat glass 30 respectively have a first strengthening layer 10 and a second strengthening layer 20, and refer to FIG. 2 for a schematic structural diagram.

According to the embodiment of the present invention, there is no restriction on the specific type of plate glass, and those skilled in the art can flexibly select an applicable plate glass according to actual needs. In an embodiment of the present invention, flat glass includes, but is not limited to, Corning glass. Therefore, the strength is good and the usability is good.

According to an embodiment of the present invention, considering the actual situation such as the specific type and performance of the flat glass and the method for preparing the curved glass, the thickness of the flat glass is 0.1-1.0 mm, such as 0.4 mm, 0.5 mm, 0.7 mm or 0.9 mm. Therefore, it is more conducive to the bending of the flat glass in the subsequent steps, not only to ensure that the curved glass with a predetermined curvature can be obtained, but also to ensure the strength performance of the curved glass; if the flat glass is too thin, its strength will be weakened, resulting in bending. damage during the process or subsequent use; if the sheet glass is too thick, it may be detrimental to the bending of the sheet glass in subsequent steps.

According to the embodiments of the present invention, there are no restrictions on the formation methods of the first reinforcement layer and the second reinforcement layer, and those skilled in the art may use existing technical means to prepare them. In some embodiments of the present invention, the method for forming the first strengthening layer and the second strengthening layer is as follows: first, carry out CNC treatment (opening holes or modifying the burrs of the glass) on the flat glass according to requirements, then performing polishing treatment, and finally applying The polished flat glass is immersed in the strengthening solution for a certain period of time. In the strengthening solution, the ions flowing out of the flat glass and the ions in the strengthening solution undergo ion exchange, thereby forming compressive stress on the surface and near-surface area of the flat glass. Layer, that is, the first strengthening layer and the second strengthening layer. When the flat glass is damaged by external tensile stress, the first strengthening layer and the second strengthening layer can offset the damage stress, reduce the risk of flat glass breakage, and improve the flat glass. strength.

According to the embodiment of the present invention, there is no restriction on the thickness of the first strengthening layer and the second strengthening layer, and those skilled in the art can flexibly design according to the actual requirements such as the specific type of flat glass or the curvature of the required curved glass. In some embodiments of the present invention, the thickness of the first strengthening layer is greater than 0 microns and less than or equal to 100 microns, and the thickness of the second strengthening layer is greater than 0 microns and less than or equal to 100 microns, such as 20 microns, 40 microns, 50 microns, 60 microns or 80 microns. In this way, the strength of the flat glass can be guaranteed, and the curvature requirements of the curved glass in the subsequent steps can be realized; if the thickness is too thick, the overall thickness of the flat glass will be thickened. When it is applied to electronic products such as mobile phones, It is not conducive to the thin and light design of mobile phones.

S200: Thinning a predetermined area of the first reinforcement layer, so that the thickness of the first reinforcement layer in the predetermined area is smaller than the thickness of the second reinforcement layer.

According to the embodiment of the present invention, there is no restriction on the selection of the predetermined area, and those skilled in the art can select one or more positions of the flat glass as the predetermined area according to the desired bending position. In some embodiments of the present invention, the predetermined area is selected from the entire surface of the first strengthening layer, thereby realizing the bending of the entire flat glass. In some other embodiments of the present invention, the predetermined area is selected from two opposite edges of the first reinforcement layer. Therefore, it can be applied to the curved frame design of the display screen. Certainly, those skilled in the art can understand that the above-mentioned predetermined area is only an exemplary illustration, and should not be construed as a limitation to the present invention, and the predetermined area can be flexibly set according to the actual bending position.

According to the embodiment of the present invention, there is no restriction on the method of thinning the first strengthening layer in the predetermined area, as long as it can be thinned without affecting the properties of the flat glass and the strengthening layer. In an embodiment of the present invention, thinning the predetermined region of the first strengthening layer includes thinning the predetermined region of the first strengthening layer by polishing or etching. Therefore, the method is simple, the controllability is good, the predetermined area of the first reinforcement layer can be uniformly thinned, and the cost is low.

According to an embodiment of the present invention, when using an etching method to thin the predetermined area of the first strengthening layer, referring to FIG. 3, the etching is performed through the following steps:

S210: Form a protection layer on the second strengthening layer.

According to the embodiment of the present invention, the specific material for forming the protective layer is not limited, as long as the protective layer is not corroded in the etching solution and the second strengthening layer is not damaged, for example, the material for forming the protective layer includes but not Limited to ink, paraffin (such as paraffin liquid melted by gasoline), photoresist, etc. According to the embodiment of the present invention, the specific method of forming the protective layer is not limited, and those skilled in the art can choose flexibly according to actual needs. For example, the method of forming the protective layer includes but is not limited to methods such as coating, silk screen printing, spraying, printing, etc. .

According to an embodiment of the present invention, when the predetermined area to be thinned is the entire surface of the first reinforcement layer, those skilled in the art will understand that there is no need to form a protective layer on the surface of the first reinforcement layer; when the predetermined area to be thinned is the first reinforcement layer For a partial area of a reinforcement layer, such as the opposite side edges of the first reinforcement layer, before immersing in the etching solution, a step of forming a protection pattern on the first reinforcement layer is also included. Thus, the first strengthening layer in the non-predetermined area is protected from damage by the etchant.

According to an embodiment of the present invention, the specific method for forming the protection pattern and the material for forming the protection pattern can be the same as the above-mentioned protection layer, the difference is that the protection pattern has a predetermined pattern, and the predetermined pattern can set a mask on the first reinforcement layer Plate and directly coated, sprayed, etc., can also form a whole layer of protective layer on the first strengthening layer, and then pattern the protective layer to form.

S220: Immerse the flat glass formed with the protective layer into an etching solution to thin the predetermined area of the first strengthening layer.

According to the embodiment of the present invention, since the first strengthening layer is formed by ion exchange between the ions separated out from the flat glass and the ions in the strengthening liquid, the composition of the first strengthening layer is similar to that of the flat glass, so the etching solution can be Etching solutions commonly used for etching glass include, but are not limited to, hydrofluoric acid of a certain concentration. Thus, the first strengthening layer in the predetermined region can be effectively etched away, that is, the first strengthening layer in the predetermined region can be thinned.

According to the embodiment of the present invention, there is no special limit to the length of time for immersing the plate glass with the protective layer in the etching solution, and those skilled in the art can determine the thickness according to the actual conditions such as the thickness of the first strengthening layer and the concentration of the etching solution. It is enough to design the scheduled time, and there is no limit requirement here.

According to the embodiment of the present invention, the thinned thickness of the first reinforced layer is not very restrictive. Those skilled in the art can design the thickness of the first reinforced layer according to the actual conditions such as the curvature of the required curved glass and the thickness of the first reinforced layer. The thickness needs to be reduced. In an embodiment of the present invention, the thinned thickness of the first strengthening layer is greater than or equal to 5 microns and less than or equal to 100 microns. Thus, according to the greater the thinned thickness, the greater the thickness difference between the first reinforced layer and the second reinforced layer, the greater the stress difference between the first reinforced layer and the second reinforced layer, and the greater the bending curvature. According to the general principle, a variety of curved glass with different curvatures can be obtained by designing different thinning thicknesses.

Wherein, it should be noted that the thinning of the first strengthening layer mentioned in the present invention includes the situation of completely removing the first strengthening layer.

S230: removing the protective layer. Referring to Figure 4-Figure 6 for the structural schematic view of the obtained curved glass, Figure 4 and Figure 5 show that the predetermined area is selected from the entire surface of the first strengthening layer, and Figure 6 shows that the predetermined area is selected from the opposite side edges of the first strengthening layer, Among them, S1 and S2 are predetermined areas.

According to the embodiment of the present invention, there is no restriction on the method of removing the protective layer, and those skilled in the art can choose flexibly according to the actual situation, as long as the second reinforcement layer and the first reinforcement layer are not damaged when removing the protection layer. In an embodiment of the present invention, the method for removing the protective layer includes but is not limited to methods such as stripping solution or stripping.

The inventors found that by thinning the predetermined area of the first reinforcement layer so that there is a certain thickness difference between it and the second reinforcement layer, the difference in thickness will make the difference between the first reinforcement layer and the second reinforcement layer in the predetermined area A certain stress difference is generated, and the stress difference will cause the flat glass to automatically bend on the side facing the second strengthening layer in a predetermined area, thereby forming a curved glass, and the thickness between the first strengthening layer and the second strengthening layer The greater the difference, the greater the stress difference and the greater the curvature. In this way, those skilled in the art can prepare curved glass with various curvatures according to actual needs. In addition, the preparation method is simple and quick, with high yield and low cost. , without thermoforming, saving energy.

In another aspect of the present invention, the present invention provides a curved glass. According to an embodiment of the present invention, the curved glass is prepared by the aforementioned method. Therefore, the curved glass has high yield, good reliability, low preparation cost, simple preparation process and strong market competitiveness.

In yet another aspect of the present invention, the present invention provides a curved glass. According to an embodiment of the present invention, referring to FIG. 7, the curved glass includes: a glass body 40, at least a part of the glass body 40 is configured as an arc segment S3; On the surface; wherein, the thickness of the reinforced layer outside the arc segment S3 is smaller than the thickness of the reinforced layer inside the arc segment. Thus, since the thickness of the strengthening layer on the outside of the arc segment is smaller than the thickness of the strengthening layer on the inside of the arc segment, the thickness difference will cause a stress difference between the two layers of strengthening layers arranged on the two opposite surfaces of the glass body, so that The glass body and the reinforced layer are automatically bent toward the side of the thicker reinforced layer, thereby forming a curved glass with an arc segment. Moreover, the greater the thickness difference between the two reinforced layers, the greater the stress difference, and the arc segment The greater the curvature, the skilled in the art can prepare curved glass with various curvatures according to actual needs. Further, the curved glass has a high yield and low manufacturing cost, and does not need hot pressing, which saves energy.

According to an embodiment of the present invention, the thickness difference between the outer and inner reinforcement layers of the arc segment increases as the curvature of the arc segment increases. Thus, the greater the thickness difference between the outer and inner reinforcement layers of the arc segment, the greater the stress difference between the outer and inner reinforcement layers of the arc segment, and the greater the curvature of the arc segment. Therefore, in the art Technicians can design various curved glass with different curvatures based on this principle.

According to the embodiment of the present invention, there is no restriction on the position of the arc segment, and those skilled in the art can flexibly select it according to the actual situation. In some embodiments of the present invention, the glass body 40 is configured as an arc segment as a whole. Refer to FIG. 8 for a schematic view of the structure, so the thickness of the entire strengthening layer 50 outside the arc segment is thinner than that on the inside of the arc segment. Therefore, the curved glass can be applied to full-curved display screens or mobile terminals; in other embodiments of the present invention, the opposite side edges S3 of the glass body are configured as arc-shaped segments. Referring to FIG. 7 for a structural schematic diagram, Therefore, the curved glass can be applied to display screens with curved frames and mobile terminals. Thus, those skilled in the art can flexibly design the shape of the curved glass and realize the diversification of the curved glass.

According to an embodiment of the present invention, the curved glass can be prepared by the aforementioned method, wherein the thickness of the strengthening layer on the outside of the arc-shaped segment is smaller than the thickness of the strengthening layer on the inside of the arc-shaped segment. The method of thinning the first strengthening layer is realized. In addition, the requirements for the glass body, the thickness of the thinning layer, and the thickness of the strengthening layer are consistent with those described above, and will not be repeated here.

In yet another aspect of the present invention, the present invention provides a display screen. According to an embodiment of the present invention, the display screen includes the aforementioned curved glass. Therefore, the display screen has low manufacturing cost, high yield, beautiful appearance and strong market competitiveness. Of course, those skilled in the art can understand that the display screen has all the features and advantages of the above-mentioned curved glass, and details will not be repeated here.

According to the embodiment of the present invention, in addition to the above-mentioned curved glass, the display screen of the present invention also includes the necessary structures and components of a conventional display screen, such as upper and lower substrates, liquid crystal or OLED, TFT array, color filter, black matrix etc., and the above-mentioned curved glass can constitute the upper and lower substrates or cover plates.

In yet another aspect of the present invention, the present invention provides a mobile terminal. According to an embodiment of the present invention, the mobile terminal includes the aforementioned curved glass or the aforementioned display screen. Therefore, the mobile terminal has low manufacturing cost, high yield and strong market competitiveness. Of course, those skilled in the art can understand that the mobile terminal has all the features and advantages of the above-mentioned display screen or curved glass, and details will not be repeated here.

According to the embodiment of the present invention, there is no restriction on the specific type of the mobile terminal, and those skilled in the art can flexibly choose according to actual needs. In an embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a TV, or any wearable device with a display function.

Those skilled in the art can understand that, in addition to the above-mentioned curved glass, the above-mentioned mobile terminal also includes the necessary structures and components of a conventional mobile terminal. Taking a mobile phone as an example, in addition to the above-mentioned curved glass, it is best to include an array substrate, a color filter Substrate, CPU processor, sound processing module. Fingerprint film module and camera module, etc., the curved glass mentioned above can constitute the front cover or rear shell of the mobile phone, etc.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (14)

1. A method for preparing curved glass, characterized in that, comprising: providing flat glass, the opposite surfaces of the flat glass have a first strengthening layer and a second strengthening layer respectively; A predetermined area of the first reinforcement layer is thinned so that the thickness of the first reinforcement layer in the predetermined area is smaller than the thickness of the second reinforcement layer. 2. The method according to claim 1, characterized in that the thickness of the flat glass is 0.1-1.0 mm. 3. The method according to claim 1, wherein the thickness of the first reinforcement layer is greater than 0 micrometers and less than or equal to 100 micrometers, and the thickness of the second reinforcement layer is greater than 0 micrometers and less than or equal to 100 micrometers. 4. The method according to claim 1, wherein thinning the predetermined region of the first strengthening layer comprises thinning the predetermined region of the first strengthening layer by polishing or etching. 5. The method according to claim 4, wherein the thinning of the predetermined region of the first reinforcement layer by the etching is performed by the following steps: forming a protective layer on the second strengthening layer; immersing the flat glass formed with the protective layer into an etching solution to thin the predetermined region of the first strengthening layer; The protective layer is removed. 6. The method according to claim 5, further comprising a step of forming a protection pattern on the first strengthening layer before immersing in the etching solution. 7 . The method according to claim 1 , wherein the thinned thickness of the first reinforcement layer is greater than or equal to 5 microns and less than or equal to 100 microns. 8 . The method according to claim 1 , wherein the predetermined area is selected from the entire surface of the first reinforcement layer or the opposite side edges of the first reinforcement layer. 9. A curved glass, characterized in that it is prepared by the method according to any one of claims 1-8. 10. A curved glass, characterized in that it comprises: a glass body, at least a portion of which is configured as an arc segment; a strengthening layer, the strengthening layer is arranged on two opposite surfaces of the glass body; Wherein, the thickness of the reinforcement layer outside the arc segment is smaller than the thickness of the reinforcement layer inside the arc segment. 11 . The curved glass according to claim 10 , characterized in that, the thickness difference between the strengthening layer on the outside and inside of the arc segment increases as the curvature of the arc segment increases. 12 . The curved glass according to claim 10 , wherein the whole of the glass body is configured as the arc segment or the opposite side edges of the glass body are configured as the arc segment. 13 . 13. A display screen, comprising the curved glass according to any one of claims 9-12. 14. A mobile terminal, characterized by comprising the curved glass according to any one of claims 9-12 or the display screen according to claim 13.