KR20170033207A - Curved Tempered Glass, Curved Tempered Glass Film And Method For Manufacturing The Same - Google Patents

Abstract

The present invention relates to a reinforced glass having a stress layer formed on a surface, which comprises: a plane part having a first thickness; a curved part which is extended from the plane part toward any one direction to be bent; and a step part which is formed along a boundary between the plane part and the curved part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tempered glass having a curved surface portion,

The present invention relates to a tempered glass having a curved portion and a manufacturing method thereof.

In recent years, tempered glass whose surface has been reinforced to increase the mechanical strength of fragile glass has been spreading, and its application field has also been diversified. For example, due to the development of portable information processing devices, the demand for various display devices is increasing rapidly. The display device includes a protective cover for protecting internal elements of the display device, and glass can be used as the material of the protective cover. When glass is used as the protective cover, it has the advantage of securing weather resistance, scratch resistance and high transmittance, but it is exposed to the outside, which can be easily broken by an impact due to external factors. In order to solve such disadvantages, studies for securing the mechanical strength of glass have been actively conducted.

As a method for strengthening glass, a physical strengthening method is known. The physical strengthening method is a method in which the glass is heated at a high temperature for a certain time and then the surface of the glass is quenched by wind cooling or the like to cause a compressive stress on the surface of the glass and a tensile stress to be generated inside.

However, the physical strengthening method using the temperature difference between the inside and the outside has a limitation in strengthening the thin film type glass. That is, in the case of thin glass, it is difficult to form a compressive stress on the surface of the glass plate because the temperature difference between the surface and the inside is hard to occur. The display device may include a touch screen panel capable of recognizing a user's touch and / or gesture, thereby sensing a motion of a user's hand or a conductive body. The glass for protecting the display device is required to be formed as a thin film in order to increase the sensitivity of the touch sensing. Thus, there is a limit to using physical strengthening methods to form thin tempered glass.

On the other hand, as glass is applied in various fields, a glass having a curved portion corresponding to various needs of the user is spreading. For example, as a curved surface display device is provided, it is required to manufacture a glass having a curved surface portion as a protective cover corresponding to a curved surface display device.

Conventional techniques for manufacturing a glass including a curved portion include a press 55 that heats the glass to a predetermined temperature or higher and presses the glass using a conventional machining method using a lathe and an automatic lathe (CNC), a mold corresponding to a glass shape including a curved portion, A molding method, and a slumping molding method using gravity and a mold at a high temperature. However, the glass provided by such a method has problems of poor quality, low productivity and yield. Also, there is a question of how the tempered glass can be processed.

Accordingly, there is a need to develop a tempered glass manufacturing method capable of raising the mechanical strength of a thin glass to be strengthened, and also capable of processing a curved portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a tempered glass having a curved portion by chemically strengthening a thin glass and performing a removal process on a part thereof.

In order to achieve the above or other objects, the present invention relates to a tempered glass having a reinforced surface and a stress layer formed on the surface, the tempered glass having a flat portion having a first thickness, bending extending in at least one direction from the flat portion, And a step formed along the boundary between the planar portion and the curved surface portion.

The stress layer formed on one of the upper surface and the lower surface of the curved surface portion may be thinner than the thickness of the stress layer formed on the surface of the flat surface portion.

The stress layer formed on any one of the upper surface and the lower surface of the curved portion can be removed.

A method for manufacturing a tempered glass according to the present invention is a method for manufacturing a tempered glass including a first step of providing a glass base material having a flat surface portion and a curved surface portion extending in at least one direction from the flat surface portion, And a third step of performing a removal process on at least a part of the surface of the glass substrate. The curved portion is bent during the etching process.

The strengthening treatment may be to form the stressed layer on the glass surface layer through the substitution of ions using a chemical strengthening method.

The curved portion may be bent by a stress difference between any one of the upper and lower surfaces on which the removal process is performed and the other surface.

The third step may include removing a part of the thickness of the curved portion through the removing process to form a step along the boundary between the flat portion and the curved portion.

The removal process may be an etching process.

Wherein the third step further comprises the step of providing a mask covering the entire surface of the glass substrate, wherein the mask includes an opening for exposing any one of the upper surface and the lower surface to be subjected to the etching process, The bending direction of the curved surface portion can be determined.

The removal process may be a polishing process.

Wherein the third step further comprises the step of providing a polishing pad on the glass substrate, wherein the polishing pad is disposed on one of the upper and lower surfaces on which the polishing process is to be performed, The bending direction of the curved surface portion can be determined.

The degree of bending of the curved portion may be adjusted by varying the thickness of the stress layer in the second step.

The bending degree of the curved surface portion can be adjusted by varying the surface thickness of the curved surface portion removed by the etching process in the third step.

The surface thickness of the curved surface portion removed by the etching process may be controlled by varying at least one of the type of etchant in the etching process and the etching process time.

A tempered glass film according to the present invention includes a flat portion having a first thickness, a curved portion bent and extending from at least one of the flat portions in a first direction, and a stepped portion formed at a boundary between the flat portion and the curved portion, A first release film provided under the tempered glass, and a first adhesive layer positioned between the tempered glass and the first adhesive layer.

The first pressure-sensitive adhesive layer is provided only on the curved surface portion of the tempered glass, so that the stepped portion and the stepped portion can be reduced or eliminated.

A second release film provided on the tempered glass, and a second adhesive layer interposed between the tempered glass and the second release film.

The tempered glass according to the present invention is strengthened by the chemical strengthening method, so that the tempering treatment can be performed on the thin glass base material, the manufacturing cost and the manufacturing time can be reduced, and the productivity and the yield can be improved. It also has the advantage that it can be strengthened without further deformation or physical processing of the glass substrate.

The present invention can improve the productivity and yield by forming the curved surface portion through the etching process, unlike the processing methods used to form the curved portion in the past, to prevent the deterioration of the quality of the processed glass, So that the time can be shortened. In addition, according to the method of manufacturing tempered glass according to an embodiment of the present invention, since the designer can process the shape of the final product by controlling the process conditions, it is possible to make various design changes compared to the conventional method using the mold And the design change is relatively easy.

1 is a view illustrating a tempered glass according to an embodiment of the present invention.
2 to 6 are cross-sectional views illustrating a process for manufacturing tempered glass according to an embodiment of the present invention.
FIG. 7 is an enlarged view of the AR area in FIG.
8 to 12 are cross-sectional views illustrating a process for manufacturing tempered glass according to another embodiment of the present invention.
13 is a view for explaining an application field of tempered glass according to an embodiment of the present invention.
14 is a schematic cross-sectional view of a tempered glass film according to an embodiment of the present invention.
15 to 18 are flowcharts showing a method of manufacturing a tempered glass film according to an embodiment of the present invention.
19 and 20 are views for explaining the arrangement of the constituent elements constituting the tempered glass film according to an embodiment of the present invention in detail.
21 is a flow chart illustrating a process for manufacturing tempered glass according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "part" for the constituent elements used in the following description is to be given or mixed with consideration only for ease of specification, and does not have a meaning or role that distinguishes itself. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, a tempered glass and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG.

1 is a view illustrating a tempered glass according to an embodiment of the present invention.

Referring to FIG. 1, a tempered glass 1 according to an embodiment of the present invention includes a planar portion FA and a curved portion BA. The plane portion FA means a region having a planar shape in the tempered glass 1 according to the present invention. The curved surface portion BA means a region where the tempered glass 1 according to the present invention is bent to have a curved shape. The curved surface portion BA extends from at least one side of the flat surface portion FA. The flat surface portion FA has a first thickness t1 and the curved surface portion BA has a second thickness t2. A step 30 is formed at the boundary between the flat surface portion FA and the curved surface portion BA by the thickness difference between the flat surface portion FA and the curved surface portion BA.

A method of manufacturing the tempered glass 1 according to an embodiment of the present invention will be described with reference to Figs. 2 to 6. Fig. 2 to 6 are cross-sectional views illustrating a process for manufacturing tempered glass according to an embodiment of the present invention.

Referring to Fig. 2, a glass substrate 10 for a tempering treatment is provided. The glass substrate 10 has a flat surface portion FA and a curved surface portion BA extending from at least one side of the flat surface portion FA. The plane portion FA means a region having a planar shape after the final process. The curved portion BA refers to a region having a curved shape bent after the final process.

Referring to FIG. 3, a tempering process for reinforcing the glass substrate 10 on which the plane portion FA and the curved surface portion BA are defined proceeds. The tempering process proceeds according to the chemical strengthening method. The chemical strengthening method is a method of forming a stress layer on the glass surface layer through substitution of ions. The stress layer may be a compressive stress layer (20). The driving force for ion substitution can be influenced by the diffusion coefficient of individual ions due to diffusion by concentration gradient. For example, by immersing the glass substrate 10 in a salt bath (molten potassium nitrate) at 400 to 500 ° C. for a certain period of time, alkali metal ions (sodium ions) having a small ionic radius existing in the surface layer of the glass substrate 10, Can be induced to be substituted with an alkali metal ion (potassium ion) having a relatively large ionic radius. Thus, a compressive stress layer 20 is formed on the surface of the glass substrate 10. The compressive stress layer 20 refers to the outer surface layer of the glass substrate 10 formed by ion exchange with relatively large ions entering the surface of the glass substrate 10. As the compressive stress layer 20 is formed, the strength of the glass substrate 10 which is susceptible to tensile stress can be increased. The strength of the glass substrate 10 can be further improved as the depth of the compressive stress layer 20 (hereinafter referred to as DOL) is deeper.

The tempered glass 1 according to the embodiment of the present invention is reinforced by a chemical strengthening method rather than a physical strengthening method, so that it is possible to strengthen the thin glass substrate 10, reduce the manufacturing cost and the manufacturing time, Productivity and yield can be improved. It also has the advantage that it can be strengthened without additional deformation or physical processing of the glass substrate 10.

Referring to Fig. 4, a mask 50 is provided on the reinforced glass substrate 10. The mask 50 includes an opening OR and a non-opening portion NOR. The mask 50 may be made of a material that is not deformed by the etching liquid 60. The mask 50 surrounds the entire surface along the periphery of the reinforced glass substrate 10 and exposes any one of the upper and lower surfaces of the curved surface portion BA through the opening OR. The surface of the curved portion BA exposed through the opening OR can be determined according to the bending direction intended by the designer. In other words, depending on the position of the opening OR, the bending direction of the curved surface portion BA can be determined. The position of the opening can determine the bending direction. For example, the designer can arrange the opening OR of the mask 50 so that the lower surface of the curved portion BA can be exposed, in order to bend the curved portion BA downward. Hereinafter, an example in which the opening OR is disposed so as to expose the lower surface for bending the curved surface portion BA in the downward direction will be described as an example.

Referring to FIG. 5, an etching process is performed to apply the etching solution 60 to the surface of the glass substrate 10 provided with the mask 50. The etching process may include all known processes capable of removing the surface of the glass substrate 10. It is preferable that the etching liquid 60 is applied in a direction perpendicular to the surface exposed by the opening OR. A part of the thickness of the curved portion BA exposed to the outside by the opening OR is removed through the etching process.

Referring to FIG. 6, when the lower surface of the curved portion BA is removed by the etching process, a difference in DOL (D) occurs between the lower surface on which the etching process is performed and the upper surface on which the etching process is not performed. As the compressive stress formed on the lower surface of the curved portion BA is reduced compared to the compressive stress formed on the upper surface, the curved portion BA bends downward corresponding to the compressive stress difference. At this time, the thickness t2 of the curved surface portion BA is reduced as compared with the thickness t1 of the flat surface portion FA as the etching process is performed exclusively on the curved surface portion BA. Therefore, a step 30 is generated at the boundary between the curved surface portion BA and the flat surface portion FA.

Unlike the processing methods used to form the conventional curved surface portion BA, the present invention can improve the productivity and yield by forming the curved surface portion BA through the etching process, and prevent deterioration of the quality of the processed glass And has the effect of shortening the manufacturing cost and the manufacturing time. In addition, the method of manufacturing a tempered glass according to an embodiment of the present invention allows a designer to adjust process conditions such as a tempering process time and a depth of a DOL, a kind and amount of an etchant, and an etching process time, Can be processed. Accordingly, it is possible to perform various design changes in comparison with a processing method using a conventional mold or the like, and it is advantageous that the design change is relatively easy.

For example, the method of manufacturing the tempered glass 1 according to an embodiment of the present invention may vary the degree of bending of the curved portion BA with different etching amounts. Table 1 shows the results of the experiment when the length L of the curved surface portion BA in the glass of 0.1T thickness t was 10mm as the reference REF (see Fig. 3) And the bending degree of the curved surface portion BA can be adjusted. The etching amount in the table means the thickness of the lower surface of the curved portion (BA) removed through the etching process.

0.1 T Glass DOL (D) (占 퐉) Etching amount (탆) Curved surface portion BA (mm) t (thickness) L (length) REF. - - 0.10 10.00 One
30
20 4.32 8.31 2 30 4.95 7.91 3 40 6.03 7.11

As another example, in the method of manufacturing the tempered glass 1 according to an embodiment of the present invention, the degree of bending of the curved surface portion BA may be varied by changing the DOL (D). Table 2 shows DOL (D) in the state where the other conditions are constant, with reference to the reference REF when the length L of the curved surface portion BA is 10 mm in the glass of 0.1T thickness (t) It is possible to adjust the degree of bending of the curved portion BA by controlling only the curvature of the curved portion BA.

0.1 T Glass DOL (D) (占 퐉) Etching amount (탆) Curved surface portion BA (mm) t (thickness) L (length) REF. - - 0.10 10.00 One 10
20

2.23 9.24 2 20 3.16 8.65 3 30 4.32 8.31 4 40 4.15 7.91

As another example, the method of manufacturing the tempered glass 1 according to an embodiment of the present invention may vary the degree of bending of the curved portion BA by varying the etching amount and the DOL (D). Table 3 shows the relationship between the etching amount and / or the etching amount in a state where other conditions are constant, with reference to the reference REF when the length L of the curved surface portion BA is 10 mm in the glass of 0.1T thickness (t) Or DOL (D) to control the degree of bending of the curved portion BA.

0.1 T Glass DOL (D) (占 퐉) Etching amount (탆) Curved surface portion BA (mm) t (thickness) L (length) REF. - - 0.10 10.00 One
10
20 2.23 9.24 2 30 2.81 8.38 3 40 3.58 7.73 4
20
20 3.16 8.65 5 30 3.68 8.37 6 40 4.84 7.97 7
30
20 4.32 8.31 8 30 4.95 7.91 9 40 6.03 7.11 10
40
20 4.15 7.91 11 30 4.81 7.43 12 40 6.35 6.47

Referring to FIG. 7, the relationship between the surface thickness (etching amount) of the curved surface portion BA removed through the etching process and the compressive stress layer 20 formed during chemical strengthening will be described. FIG. 7 is an enlarged view of the AR area in FIG.

As shown in FIG. 7 and the above-described experimental example, as the etching process is performed on the lower surface of the curved portion BA, the thickness of the compressive stress layer 20 formed on the lower surface of the curved portion BA can be reduced (Fig. 7 (a)), the compressive stress layer 20 can be removed (Fig. 7 (b)) and over-stressed beyond the compressive stress layer 20 ). The etching amount can be adjusted to correspond to the degree of bending which is the target, according to the intention of the designer. However, it is preferable that the etching amount is appropriately adjusted so as to prevent the strength reduction caused by the complete removal of the compressive stress layer 20 formed on the lower surface of the curved portion BA.

Hereinafter, a tempered glass and a manufacturing method thereof according to another embodiment of the present invention will be described with reference to FIGS. 8 to 12. FIG. 8 to 12 are cross-sectional views illustrating a process for manufacturing tempered glass according to another embodiment of the present invention.

Referring to Fig. 8, a glass substrate 10 for a tempering treatment is provided. The glass substrate 10 has a flat surface portion FA and a curved surface portion BA extending from at least one side of the flat surface portion FA. The plane portion FA means a region having a planar shape after the final process. The curved portion BA refers to a region having a curved shape bent after the final process.

Referring to FIG. 9, a tempering process for strengthening the glass substrate 10 on which the plane portion FA and the curved portion BA are defined proceeds. The tempering process proceeds according to the chemical strengthening method. The chemical strengthening method is a method of forming a stress layer on the glass surface layer through substitution of ions. The stress layer may be a compressive stress layer (20). The driving force for ion substitution can be influenced by the diffusion coefficient of individual ions due to diffusion by concentration gradient. For example, by immersing the glass substrate 10 in a salt bath (molten potassium nitrate) at 400 to 500 ° C. for a certain period of time, alkali metal ions (sodium ions) having a small ionic radius existing in the surface layer of the glass substrate 10, Can be induced to be substituted with an alkali metal ion (potassium ion) having a relatively large ionic radius. Thus, a compressive stress layer 20 is formed on the surface of the glass substrate 10. The compressive stress layer 20 refers to the outer surface layer of the glass substrate 10 formed by ion exchange with relatively large ions entering the surface of the glass substrate 10. As the compressive stress layer 20 is formed, the strength of the glass substrate 10 which is susceptible to tensile stress can be increased. The strength of the glass substrate 10 can be further improved as the DOL (D) of the compressive stress layer 20 is deeper.

The tempered glass 1 according to another embodiment of the present invention is reinforced by a chemical strengthening method instead of a physical strengthening method to enable strengthening treatment in the thin glass base 10 and to reduce manufacturing cost and manufacturing time, Productivity and yield can be improved. It also has the advantage that it can be strengthened without additional deformation or physical processing of the glass substrate 10.

Referring to Fig. 10, a polishing pad 53 and a press 55 for providing a load to the polishing pad 53 are provided on the reinforced glass substrate 10. The polishing pad 53 is disposed on either the upper surface or the lower surface of the curved surface portion BA. The surface of the curved surface portion BA on which the polishing pad 53 is disposed can be determined according to the bending direction intended by the designer. In other words, depending on the position where the polishing pad 53 is disposed, the bending direction of the curved surface portion BA can be determined. For example, the designer may place the polishing pad 53 on the upper surface of the curved portion BA to bend the curved portion BA upward. Hereinafter, the case where the polishing pad 53 is disposed on the upper surface of the curved surface portion in order to bend the curved surface portion BA in the upward direction will be described as an example.

Referring to FIG. 11, a polishing process is performed on the surface of the reinforced glass substrate 10. The upper surface of the curved portion is in contact with the polishing pad 53. The upper surface of the curved portion is provided with a polishing load from the press 55 through the polishing pad 53. [ The polishing pad 53 may be repeatedly operated in a predetermined direction as shown in the figure. A part of the upper surface of the curved surface portion BA is removed by the repetitive operation of the polishing pad 53. [ In order to continuously carry out the polishing process, it is possible to selectively supply the polishing liquid and the cleaning liquid during operation of the polishing pad 53, thereby increasing the process efficiency and yield. The processing conditions such as the polishing load, the polishing rate, and the polishing time can be appropriately selected depending on the strength of the glass base material and the like. The shape and structure of the polishing pad 53, the polishing process method, and the like can be well known techniques.

Referring to FIG. 12, when the upper surface of the curved portion BA is removed by the polishing process, a difference in DOL (D) occurs between the upper surface where the polishing process is performed and the lower surface where the polishing process is not performed. As the compressive stress formed on the upper surface of the curved portion BA is reduced compared to the compressive stress formed on the lower surface, the curved portion BA bends upward in correspondence to the compressive stress difference. At this time, the thickness t2 of the curved surface portion BA is reduced as compared with the thickness t1 of the flat surface portion FA, as the polishing process is performed only on the curved surface portion BA. Therefore, a step 30 is generated at the boundary between the curved surface portion BA and the flat surface portion FA.

The curved surface portion BA of the tempered glass according to the present invention can be formed by carrying out the polishing process with high accuracy. The tempered glass manufacturing method according to another embodiment of the present invention can provide a tempered glass having a curved surface portion BA improved in flatness and smoothness by using a polishing process.

The tempered glass 1 according to one embodiment of the present invention can be used in various fields. 13 is a view for explaining an application field of tempered glass according to an embodiment of the present invention.

For example, referring to Fig. 13A, the tempered glass 1 according to the present invention may be a cover glass (CW) of a display device having a curved portion. The cover glass (CW) functions as a substrate for protecting elements inside the display device. The display device may include a display panel (DP) having display elements and a driving element for implementing an image, and a touch screen panel (TSP) for sensing movement of a user's hand and / or a conductor. In such a case, the cover glass (CW) disposed on the touch screen panel TSP needs to be thinned to prevent thinning of the touch sensing sensitivity and to be reinforced so that it is not easily broken by an external impact. In addition, corresponding to the variably varying display devices, a cover glass (CW) including a curved portion needs to be used. Therefore, the tempered glass 1 according to the present invention can perform all the functions described above, and can be suitable as a cover glass (CW) of a display device.

13 (b), the tempered glass 1 according to the present invention may be a protective film (PF) for protecting the cover glass of the display device. (Hereinafter referred to as "tempered glass film") is used as the protective film PF for protecting the cover glass CW of the display device DD. It is necessary to secure the mechanical strength required to protect the cover glass (CW) provided on the outermost side of the display device DD. Further, in order to improve the esthetics, it is necessary to cope with various mold release products, and it is necessary to be thin to prevent an increase in thickness. Therefore, the tempered glass 1 according to the present invention can satisfy such a demand, and is suitable as a tempered glass film (PF) for protecting the cover glass (CW) provided at the outermost part of the display device DD can do.

Hereinafter, with reference to FIG. 14 to FIG. 18, a description will be given of a case where the tempered glass according to the present invention is used as a tempered glass film for protecting the cover glass of a display device (FIG. 13B) do. 14 is a schematic cross-sectional view of a tempered glass film according to an embodiment of the present invention. 15 to 18 are flowcharts showing a method of manufacturing a tempered glass film according to an embodiment of the present invention.

14, a tempered glass film PF according to an embodiment of the present invention includes a tempered glass 1 having a curved surface portion, a first pressure sensitive adhesive layer 112 located on the lower surface of the tempered glass 1, 1 pressure-sensitive adhesive layer (112).

The first pressure-sensitive adhesive layer 112 is a layer for adhering the tempered glass film (PF) to the cover glass (CW, Fig. 13) of the display device. The first pressure-sensitive adhesive layer 112 refers to a layer directly contacting the cover glass (CW, Fig. 13) of the display device when the user uses a tempered glass film (PF). The first pressure sensitive adhesive layer 112 may include any one of silicone, acrylic, and urethane based pressure sensitive adhesives. However, the present invention is not limited thereto.

The first release film 114 is located on the lower surface of the tempered glass 1 via the first pressure-sensitive adhesive layer 112. The first release film 114 can protect the first pressure-sensitive adhesive layer 112 and preferably has sufficient releasability. The first release film 114 may be formed of a material such as polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene naphthalate (PEN) And polyimide (PI). However, the present invention is not limited thereto.

The tempered glass film PF according to an embodiment of the present invention is formed by sequentially laminating a second pressure sensitive adhesive layer 122 positioned on the upper surface of the tempered glass 1 and a second release film 122 positioned on the upper surface of the second pressure sensitive adhesive layer 122 124).

The second release film 124 is for protecting the tempered glass 1 from the outside, and is located on the upper surface of the tempered glass 1. The second release film 124 is for protecting the tempered glass 1 in the distribution step and when the user uses the tempered glass film PF, the second release film 124 is separated to form the tempered glass 1, Can be exposed to the outside. The second release film 124 may be formed of a material such as polyethylene terephthalate (PET), polycarbonate, polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA), polyethylene naphthalate (PEN) And polyimide (PI). However, the present invention is not limited thereto.

The second pressure sensitive adhesive layer 122 is interposed between the tempered glass 1 and the second release film 124 to adhere the tempered glass 1 and the second release film 124 to each other. The second pressure sensitive adhesive layer 122 is removed when the user uses a tempered glass film (PF), and the user can use the tempered glass 1 in a state in which the tempered glass 1 is exposed to the outside. The second pressure sensitive adhesive layer 122 may include any one of silicone, acrylic, and urethane based pressure sensitive adhesives. However, the present invention is not limited thereto.

Referring to FIG. 15, a method of manufacturing a tempered glass film PF according to an embodiment of the present invention includes a step S110 of providing a tempered glass 1 having a curved surface portion, A step S120 of forming a pressure sensitive adhesive layer 112 and a step S130 of attaching a first release film 114 to the lower surface of the first pressure sensitive adhesive layer 112.

In step S120 of forming the first pressure-sensitive adhesive layer 112 on the lower surface of the tempered glass 1, the process of applying the first pressure-sensitive adhesive on the lower surface of the provided tempered glass 1 is performed. The thickness of the first pressure-sensitive adhesive layer 112 coated on the tempered glass can be suitably selected in consideration of the adhesive force of the pressure-sensitive adhesive.

The first release film 114 is attached to the lower surface of the tempered glass 1 via the first pressure sensitive adhesive layer 112 in the step of attaching the first release film 114 to the lower surface of the first pressure sensitive adhesive layer 112 And the like. It is preferable that the first release film 114 is appropriately formed so that the thickness of the first release film 114 is easily ensured, while securing necessary releasing characteristics as a layer to be removed when the user uses the tempered glass film (PF).

16, a method of manufacturing a tempered glass film PF according to another embodiment of the present invention includes steps S110 'and S110' of providing tempered glass 1 and a first release film 114 having curved portions, A first adhesive layer 112 is formed on one side of the first release film 114 and a first release film 114 having a first adhesive layer 112 formed on the lower surface of the tempered glass 1 (S130 ').

In step S120 'of forming the first pressure sensitive adhesive layer 112 on one side of the first release film 114, a process of applying a first pressure sensitive adhesive on one side of the provided first release film 114 is performed. The thickness of the first pressure-sensitive adhesive layer 112 coated on the first release film 114 can be appropriately selected in consideration of the adhesive force of the pressure-sensitive adhesive. At this time, the step of forming the first pressure sensitive adhesive layer 112 on one side of the first release film 114 may be performed at the same time as the first release film 114 having the first pressure sensitive adhesive layer 112 formed thereon And passing through the chambers. The first pressure sensitive adhesive layer 112 can be stabilized by removing volatility through the chambers.

In the step S130 'of attaching the first release film 114 having the first adhesive layer 112 formed on the lower surface of the tempered glass 1 to the tempered glass 1 through the first pressure sensitive adhesive layer 112, And the first release film 114 are adhered to each other. The first release film 114 is preferably a layer to be removed when the user uses the tempered glass film (PF), and it is preferable that the first release film 114 is appropriately formed so as to secure the necessary releasing property but to easily remove it.

17, a tempered glass film (PF) according to another embodiment of the present invention is formed by laminating a reinforcing glass film (PF) shown in Figs. 15 and 16 to a second releasing film 124 and a second pressure- 122 may be further formed.

A method of manufacturing a tempered glass film PF according to another embodiment of the present invention includes the step S210 of providing tempered glass 1 having a first adhesive layer 112 and a first release film 114 formed on a lower surface thereof, A step S220 of forming a second pressure sensitive adhesive layer 122 on the upper surface of the tempered glass 1 and a step S230 of attaching a second release film 124 to the upper surface of the second pressure sensitive adhesive layer 122 .

In step S220 of forming the second pressure sensitive adhesive layer 122 on the upper surface of the tempered glass 1, the process of applying the second pressure sensitive adhesive on the upper surface of the provided tempered glass 1 is performed. The thickness of the second pressure sensitive adhesive layer 122 coated on the upper surface of the tempered glass 1 can be appropriately selected in consideration of the adhesive force of the pressure sensitive adhesive. The second release film 124 is adhered to the upper surface of the tempered glass 1 through the second pressure sensitive adhesive layer 122 in the step S230 of attaching the second release film 124 to the upper surface of the second pressure sensitive adhesive layer 122, And the like.

The second release film 124 and the second pressure-sensitive adhesive layer 122 are formed as layers to be removed when the user uses the tempered glass film (PF) to appropriately form the thickness thereof .

18, a tempered glass film (PF) according to another embodiment of the present invention is formed by laminating a tempered glass film (PF) shown in Figs. 15 and 16 onto a second release film 124 and a second adhesive layer 122 may be further formed.

The method for manufacturing a tempered glass film (PF) according to another embodiment of the present invention comprises a tempered glass 1 having a first pressure-sensitive adhesive layer 112 and a first release film 114 formed on a lower surface thereof, A step S220 'of forming a second pressure sensitive adhesive layer 122 on one surface of the second release film 124 and a step S220' of forming a second pressure sensitive adhesive layer 122 on the upper surface of the tempered glass 1, (S230 ') attaching the second release film 124 on which the second release film 122 is formed.

In step S220 'of forming the second pressure sensitive adhesive layer 122 on one side of the second release film 124, a process of applying a second pressure sensitive adhesive on one side of the provided second release film 124 is performed. The thickness of the second pressure-sensitive adhesive layer 122 coated on the second release film 124 can be appropriately selected in consideration of the adhesive force of the pressure-sensitive adhesive. At this time, the second adhesive layer 122 is formed on one side of the second release film 124, and the second release film 124 on which the second adhesive layer 122 is formed has a different temperature And passing through the chambers. The second pressure sensitive adhesive layer 122 can be stabilized by removing volatility through the chambers.

In the step S230 'of attaching the second release film 124 having the second pressure-sensitive adhesive layer 122 formed on the upper surface of the tempered glass 1, the tempered glass 1 and the second release film 122 are bonded via the second pressure- The process of attaching the second release film 124 proceeds. The second release film 124 and the second pressure sensitive adhesive layer 122 are layers that are removed when the user uses the tempered glass film PF, desirable.

19 and 20 are views for specifically illustrating the arrangement of the constituent elements constituting the tempered glass film (PF) according to an embodiment of the present invention.

The tempered glass film PF according to one embodiment of the present invention includes a tempered glass 1 having a curved surface portion, a first release film 114 positioned under the tempered glass 1, a tempered glass 1, And a first pressure-sensitive adhesive layer 112 interposed between the films 114.

Referring to Fig. 19, the tempered glass 1 includes a flat portion and a curved portion. The first pressure sensitive adhesive layer 112 is provided on the bottom surface of the tempered glass 1 so as to cover both the curved surface portion and the flat surface portion. Accordingly, when the user attaches the tempered glass film (PF) to the display device, the tempered glass film (PF) and the cover glass (CW, FIG. 13) of the display device are bonded to each other via the first pressure- Respectively. The first release film 114 is provided to cover the entire lower surface of the first pressure sensitive adhesive layer 112 to protect the first pressure sensitive adhesive layer 112.

Referring to Fig. 20, the tempered glass 1 includes a flat portion and a curved portion. The curved portion has a thinner thickness than the flat portion by removing a part of the lower surface through the etching process.

The first pressure-sensitive adhesive layer 112 is provided on the bottom surface of the curved portion of the tempered glass 1 so as to cover only the curved portion. The first pressure sensitive adhesive layer 112 may have a thickness corresponding to the thickness of the flat portion and the thickness of the curved portion. By providing the first pressure-sensitive adhesive layer 112, it is possible to reduce or eliminate the difference in level between the curved surface portion of the tempered glass 1 and the flat portion boundary. The material of the first pressure-sensitive adhesive layer 112 is preferably determined in consideration of the refractive index with the tempered glass 1. That is, the material of the first pressure-sensitive adhesive layer 112 is preferably selected in consideration of visibility in order to prevent a sense of heterogeneity that may occur because the first pressure-sensitive adhesive is formed only on a part of the tempered glass 1. When the user attaches the tempered glass film PF to the display device, the curved surface portion of the tempered glass film PF and the cover glass CW (FIG. 13) of the display device via the first pressure- Respectively.

The first pressure-sensitive adhesive layer 112 of the present invention can be formed only on the curved portion of the tempered glass 1, unlike the case where the pressure-sensitive adhesive layer is formed on one entire surface of the tempered glass film (PF). Therefore, it is possible to reduce problems such as bubble generation that can be caused by the pressure-sensitive adhesive. In addition, since the plane portion of the display device and the plane portion of the tempered glass film (PF) which are mainly recognized by the user are in contact with each other without a mediator interposed therebetween, the problem of visibility degradation due to bubble generation can be prevented.

 The first release film 114 may be provided to cover the entire lower surface of the first pressure sensitive adhesive layer 112 to protect the first pressure sensitive adhesive layer 112 (FIG. 20 (a)). However, it may be preferable to cover the lower surface of the tempered glass 1 and the lower surface of the first pressure sensitive adhesive layer 112 so that the lower surface of the tempered glass 1 is not exposed to the outside (B) of FIG.

Hereinafter, a method of manufacturing tempered glass according to another embodiment of the present invention will be described with reference to FIG. 21 is a flow chart illustrating a process for manufacturing tempered glass according to another embodiment of the present invention.

According to another embodiment of the present invention, there is provided a method of manufacturing a tempered glass, comprising the steps of: (S310) providing a glass substrate having a flat surface and a curved surface defined therein; (S320) A step S330 of performing a removal process on at least a part of the region, and a step S340 of performing a secondary strengthening treatment of the glass base material.

The method for manufacturing a tempered glass according to another embodiment of the present invention is substantially the same as the tempered glass manufacturing method of the present invention described above except for the step S340 of performing the second tempering treatment of the glass substrate. Therefore, only the step (S340) of secondary strengthening treatment of the glass base material will be described below.

The surface of the glass substrate is first hardened to form a compressive stress layer. At this time, when the thickness of the curved portion BA is partially removed, the compressive stress layer at that position is removed or the thickness is reduced. In other words, any part of the curved surface portion BA remains by the etching or polishing process in a state where the compressive stress layer is not formed or the thickness thereof is partially removed. Some of the areas of the curved part BA have lower strength than other areas of the reinforced glass substrate and are susceptible to damage from external impacts. In order to solve this problem, a secondary strengthening treatment process (S340) may be performed on the glass substrate on which the etching process or the polishing process has been performed.

The secondary tempering process (S340) proceeds according to the chemical strengthening method. The chemical strengthening method is a method of forming a stress layer on the glass surface layer through substitution of ions. The stress layer may be a compressive stress layer. The secondary tempering process (S340) may proceed with the same method and / or process conditions as the primary tempering process (S320) and may proceed with different methods and / or process conditions. For example, the second strengthening step (S340) proceeds in the same manner as the first strengthening step (S320), except that the first strengthening step (S320) and the process conditions such as the process time, . ≪ / RTI >

The thickness of the compressive stress layer formed in a partial area of the curved surface portion BA and the compressive stress layer formed in the other area may be different from each other by the secondary strengthening step S340. If necessary, it may be preferable to perform the secondary strengthening step (S340) only on the curved surface portion BA on which the etching process or the polishing process has been performed. Accordingly, the present invention can provide a tempered glass in which the strength is not lowered even after the second tempering process (S340) is performed after the etching process or the polishing process.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: Tempered glass 10: Glass substrate
FA: flat portion BA: curved portion
20: Compressive stress layer 30:
50: mask 60: etching liquid
53: polishing pad 55: press
PF: Tempered glass film 114, 124: Release film
112, 122: pressure-sensitive adhesive layer

Claims (18)

In a tempered glass having a stressed surface formed on its surface,
A flat portion having a first thickness;
A curved surface portion bent and extending from at least one of the planar portions in one direction and having a second thickness; And
And a step formed along a boundary between the planar portion and the curved portion. The method according to claim 1,
Wherein the stress layer formed on the surface of any one of the upper surface and the lower surface of the curved surface portion is thinner than the thickness of the stress layer formed on the surface of the flat surface portion. The method according to claim 1,
Wherein the stress layer formed on the surface of any one of the upper surface and the lower surface of the curved portion is removed. A first step of providing a glass substrate having a planar portion and a curved surface portion extending in at least one direction from the planar portion;
A second step of reinforcing the glass substrate to form a stress layer on the surface of the glass substrate; And
And a third step of performing a removal process on at least a part of the surface of the glass substrate,
The curved-
And bending during the removal process. 5. The method of claim 4,
The reinforcement process may include:
Wherein said stress layer is formed on said glass surface layer through the substitution of ions using a chemical strengthening method. 5. The method of claim 4,
The curved-
Wherein the bending is performed by a difference in stress between any one of the upper and lower surfaces on which the removal process is performed and the other surface. 5. The method of claim 4,
In the third step,
And removing a part of the thickness of the curved portion through the removing step to form a step along a boundary between the flat portion and the curved portion. 5. The method of claim 4,
Wherein the removing step is an etching process. 9. The method of claim 8,
In the third step,
Further comprising a mask covering the entire surface of the glass substrate,
Wherein,
And an opening exposing either the upper surface or the lower surface on which the etching process is to be performed,
The position of the opening portion
And determining a bending direction of the curved portion. 5. The method of claim 4,
Wherein the removing step is a polishing process. 11. The method of claim 10,
In the third step,
Further comprising the step of providing a polishing pad on said glass substrate,
The polishing pad may be formed,
Wherein the polishing process is performed on one of the upper surface and the lower surface,
The position of the polishing pad is,
And determining a bending direction of the curved portion. 5. The method of claim 4,
The degree of bending of the curved surface portion,
Wherein in the second step, the thickness of the stress layer is adjusted differently. 9. The method of claim 8,
The degree of bending of the curved surface portion,
Wherein in the third step, the surface thickness of the curved portion removed by the etching process is adjusted differently. 14. The method of claim 13,
The surface thickness of the curved surface portion removed by the etching process is preferably,
Wherein at least one of the type of the etchant and the etch time is varied during the etch process. 5. The method of claim 4,
Further comprising a fourth step of secondary strengthening the glass substrate. A tempered glass including a flat portion having a first thickness, a curved portion bent and extending at least in either direction from the flat portion and having a second thickness, and a step formed at a boundary between the flat portion and the curved portion;
A first release film provided under the tempered glass; And
And a first pressure-sensitive adhesive layer positioned between the tempered glass and the first pressure-sensitive adhesive layer. 17. The method of claim 16,
Wherein the first pressure-sensitive adhesive layer comprises:
Wherein the tempered glass is provided only on the curved portion of the tempered glass, and the tempered glass is reduced or eliminated. 17. The method of claim 16,
A second release film provided on the tempered glass; And
And a second pressure-sensitive adhesive layer interposed between the tempered glass and the second release film.

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