WO2020060107A1 - Curved glass and glass bending method - Google Patents

Abstract

The present invention relates to curved glass and a glass bending method and, more specifically, to curved glass and a glass bending method in which a stress to be applied when bending glass is reduced by forming a pattern on the glass.

Description

Curved glass and glass bending method

The present invention relates to a curved glass and a glass bending method, and more particularly, to a curved glass and a glass bending method in which stress applied when bending a glass is reduced by forming a pattern on the glass.

Glass (glass), due to the properties of the stiffness and the surface material and optical properties, can be used in display devices and the like. Demand for curved glass formed by bending a portion of flat glass according to the design or design requirements of a display device occurs.

When bending a portion of the flat glass, a case in which the radius of curvature of the bent portion is small may occur. When the radius of curvature of the glass is relatively small, the surface of the bending portion of the glass may be irregularly changed by stress.

Technical problem to be achieved by the present invention is to provide a curved glass pattern is formed.

Another technical problem of the present invention is to provide a curved glass having a relatively reduced stress.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, according to an aspect of the present invention, the present invention is formed by bending a part of a flat glass having a front surface and a rear surface. In the glass (curved glass), the flat portion of the flat shape; A bending portion that is bent and extended from the flat plate portion; In addition, a curved glass having a concave shape toward the outside from the bending portion and including a pattern formed in the bending portion may be provided.

According to another aspect of the present invention, a glass bending method of forming a curved glass by bending a flat glass, comprising: forming a pattern on the flat glass, a glass patterning step (S100); Forming a curved glass by bending the flat glass at a portion where the pattern is located, a glass bending step (S200); Reinforcing the curved glass, glass strengthening step (S300); And it may include a glass cleaning step (S400) for cleaning the curved glass, the pattern is characterized in that it has a concave shape toward the outside, it is possible to provide a glass bending method (S10).

The curved glass according to an embodiment of the present invention may form a pattern on the surface.

Curved glass according to an embodiment of the present invention may have a relatively reduced stress.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a view showing a display device having a curved glass according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along line A-A.

3 is a view showing a process of forming a curved glass by forming a flat glass.

4 to 7 are views showing a section of a flat glass and a section of a curved glass.

8 is a view showing each region of the glass.

FIG. 9 is a view showing region C shown in FIG. 8.

10 is a flowchart illustrating a glass bending method according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" to another part, this is not only when it is "directly connected", but also "indirectly" with another member in between. "It also includes the case where it is. Also, when a part is said to “include” a certain component, this means that other components may be further provided instead of excluding the other component unless otherwise stated.

The terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Referring to FIG. 1, the display device 10 can be observed. The display device 10 may mean a mobile phone or a smart phone. Alternatively, the display device 10 may mean a tablet PC or a laptop.

The display device 10 may include glass 100. The glass 100 may form a front surface of the display device 10. The glass 100 may transmit light.

The glass 100 may have a shape of a plate as a whole. The edge region of the glass 100 may be curved. The glass 100 may have rigidity. Therefore, the operation of implementing the curved shape by bending the glass 100 may not be easy.

FIG. 2 is a view showing a cross-section of the display device 10 of FIG. 1 taken with A-A. In FIG. 2, portions excluding the glass 100 may be indicated by dotted lines.

Referring to (a) of FIG. 2, the glass 100 may include a front side FS and a rear side RS. The front surface FS may form the front surface of the glass 100. The front side FS may face the front side of the glass 100. The rear surface RS may form the rear surface of the glass 100. The rear surface RS may face the rear surface of the glass 100. The rear surface RS may face the inside of the display device 10 (see FIG. 1).

The glass 100 may include a flat plate portion 110 and a bending portion 120. The flat portion 110 may be flat. The bending part 120 may be formed by bending at an edge of the flat plate part 110. For example, the bending portion 120 may be formed by bending backward from the edge of the flat plate portion 110. The bending portion 120 may have a shape extending rearward from the edge of the flat plate portion 110.

FIG. 2B is a view showing an area “B” in FIG. 2. Referring to FIG. 2B, stress may be generated in the process of forming the bending portion 120 by bending the edge region of the flat plate portion 110. In (b) of FIG. 2, the stress may be represented by an arrow.

In the front surface FS of the bending part 120, tensile stress may occur. That is, tensile stress may occur in the opposite direction of the bending direction. On the other hand, in the rear surface RS of the bending portion 120, compressive stress may occur. That is, compressive stress may occur in the bending direction.

When stress occurs as described above, a curvature that may be implemented may be somewhat limited. In addition, the stress may form wrinkles on the surface of the bending part 120. In addition, the bending part 120 may be irregularly formed due to stress. Accordingly, a method of suppressing or minimizing the occurrence of stress in forming the bending portion 120 may be considered.

3 may show a process of forming the curved glass 103 by forming the flat glass 101. The flat glass 101 may be referred to as “pre-forming glass”. The flat glass 101 may be understood as a concept included in the glass 100 (see FIG. 1). The curved glass 103 may be referred to as “post-molding glass”. The curved glass 103 may be understood as a concept included in the glass 100 (see FIG. 1).

The flat glass 101 may include a front side FS and a rear side RS. The front side FS and the rear side RS of the flat glass 101 may correspond to the front side FS and the rear side RS of the glass 100 (see FIG. 2), respectively.

The flat glass 101 may have a rectangular shape. The flat glass 101 may be provided in the display device 10 (see FIG. 1). Since the display device 10 (see FIG. 1) is generally provided with a rectangular glass 100 (see FIG. 1), the flat glass 101 in FIG. 3 may be represented as having a rectangular shape. However, the shape of the flat glass 101 is not limited to a rectangular shape.

The flat glass 101 may have four sides. The flat glass 101 may include, for example, a first long side LE1 and a second long side LE2. The first long side LE1 may be located opposite the second long side LE2. The first long side LE1 may be a right side. The second long side LE2 may be a left side. The first long side region LE1 may mean an area adjacent to the first long side LE1. The second long side region LE2 may mean a region adjacent to the second long side LE2.

The flat glass 101 may include, for example, a first short side SE1 and a second short side SE2. The first short side SE1 may be located opposite the second short side SE2. The first short side SE1 may be formed to extend from the top of the first long side LE1 to the top of the second long side LE2. The second short side SE2 may be formed to extend from the lower end of the first long side LE1 to the lower end of the second long side LE2. The first short side SE1 may be an upper side. The second short side SE2 may be a lower side. The first short side area SE1 may mean an area adjacent to the first short side area SE1. The second short side area SE2 may mean an area adjacent to the second short side area SE2.

A pattern for bending may be formed on the flat glass 101. For example, the pattern for bending may be formed in the first long side region LE1 or / and the second long side region LE2 of the flat glass 101.

The curved glass 103 can be formed by bending the flat glass 101. For example, the curved glass 103 may be formed by bending the first long side LE1 region and the second long side LE2 region of the flat glass 101. In this case, the bending line of the curved glass 103 may be formed along the first long side LE1 or the second long side LE2. The pattern 200 for bending (see FIGS. 4 to 9) may be formed along the bending line or in parallel with the bending line. The bending line may be formed at the boundary between the flat plate portion 110 (see FIG. 4) and the bending portion 120 (see FIG. 4).

4 to 7 are views showing a section of a flat glass and a section of a curved glass. FIG. 4 (a) shows a cross-section of the flat glass of FIG. 3 taken along B1-B1. FIG. 4 (b) shows a cross-section of the curved glass of FIG. 3 taken along B2-B2.

Referring to FIG. 4A, a front wrinkle pattern 211 may be formed on the front surface FS of the flat glass 101. The front wrinkle pattern 211 may be understood as a concept included in the front pattern 210. The front pattern 210 may be understood as a concept included in the pattern 200.

The front wrinkle pattern 211 may be formed in the first long side region LE1 (see FIG. 3) or / and the second long side region LE2 (see FIG. 3) of the flat glass 101. The front wrinkle pattern 211 may include a plurality of grooves. The shape of the cross section of the groove may be, for example, a square wave, a notch, a curve, a shape such as a sinusoidal wave, or a combination thereof.

The plurality of grooves included in the front wrinkle pattern 211 may be formed in parallel with the first long side (LE1, see FIG. 3) or the second long side (LE2, see FIG. 3). The edge region of the flat glass 101 may be bent backward.

Referring to (b) of FIG. 4, the front wrinkle pattern 211 may be located on the bending part 120. The front wrinkle pattern 211 may reduce stress applied to the bending part 120. The front wrinkle pattern 211 may reduce tensile stress applied to the front surface FS of the bending part 120. Therefore, the difference between the stress applied to the front side FS and the rear side RS of the bending portion 120 may be reduced.

Fig. 5 (a) shows a cross section of the flat glass of Fig. 3 taken along B1-B1. FIG. 5 (b) shows a cross-section of the curved glass of FIG. 3 taken along B2-B2.

Referring to (a) of FIG. 5, a rear wrinkle pattern 221 may be formed on the rear surface RS of the flat glass 101. The back wrinkle pattern 221 may be understood as a concept included in the back pattern 220. The rear pattern 220 may be understood as a concept included in the pattern 200.

The back wrinkle pattern 221 may be formed in the first long side region LE1 (see FIG. 3) or / and the second long side region LE2 (see FIG. 3) of the flat glass 101. The back wrinkle pattern 221 may include a plurality of grooves. The shape of the cross section of the groove may be, for example, a square wave, a notch, a curve, a shape such as a sinusoidal wave, or a combination thereof.

The plurality of grooves included in the rear wrinkle pattern 221 may be formed in parallel with the first long side (LE1, see FIG. 3) or the second long side (LE2, see FIG. 3). The edge region of the flat glass 101 may be bent backward.

Referring to (b) of FIG. 5, a back wrinkle pattern 221 may be positioned on the bending part 120. The back wrinkle pattern 221 may reduce stress applied to the bending part 120. The back wrinkle pattern 221 may reduce compressive stress applied to the back surface RS of the bending part 120. Therefore, the difference between the stress applied to the front side FS and the rear side RS of the bending portion 120 may be reduced.

Fig. 6 (a) shows a cross section of the flat glass of Fig. 3 taken along B1-B1. Fig. 6 (b) shows a cross section of the curved glass of Fig. 3 taken along B2-B2.

Referring to (a) of FIG. 6, the front slim pattern 213 may be formed on the front side FS of the flat glass 101. The front slim pattern 213 may be understood as a concept included in the front pattern 210.

The front slim pattern 213 may be formed in the first long side region LE1 (see FIG. 3) or / and the second long side region LE2 (see FIG. 3) of the flat glass 101. The front slim pattern 213 may be formed by being recessed rearward from the front FS. The thickness of the region of the front slim pattern 213 may be smaller than the thickness of the region other than the front slim pattern 213.

The front slim pattern 213 may be formed in parallel with the first long side LE1 (see FIG. 3) or the second long side LE2 (see FIG. 3). The edge region of the flat glass 101 may be bent backward.

Referring to FIG. 6B, the front slim pattern 213 may be positioned on the bending part 120. The front slim pattern 213 may reduce stress applied to the bending part 120. The front slim pattern 213 may reduce tensile stress applied to the front surface FS of the bending part 120. Therefore, the difference between the stress applied to the front side FS and the rear side RS of the bending portion 120 may be reduced.

Fig. 7 (a) shows a cross section of the flat glass of Fig. 3 taken along B1-B1. FIG. 7B shows a cross-section of the curved glass of FIG. 3 taken along B2-B2.

Referring to FIG. 7A, a rear slim pattern 223 may be formed on the rear surface RS of the flat glass 101. The rear slim pattern 223 may be understood as a concept included in the rear pattern 220.

The rear slim pattern 223 may be formed in the first long side region LE1 (see FIG. 3) or / and the second long side region LE2 (see FIG. 3) of the flat glass 101. The rear slim pattern 223 may be formed by being recessed forward from the rear RS. The thickness of the region of the rear slim pattern 223 may be smaller than the thickness of the region other than the rear slim pattern 223.

The rear slim pattern 223 may be formed in parallel with the first long side (LE1, see FIG. 3) or the second long side (LE2, see FIG. 3). The edge region of the flat glass 101 may be bent backward.

Referring to FIG. 7B, a rear slim pattern 223 may be positioned on the bending part 120. The rear slim pattern 223 may reduce stress applied to the bending part 120. The rear slim pattern 213 may reduce compressive stress applied to the rear surface RS of the bending portion 120. Therefore, the difference between the stress applied to the front side FS and the rear side RS of the bending portion 120 may be reduced.

8 is a view showing each region of the glass 100. The glass 100 illustrated in FIG. 8 may be a flat glass 101 (see FIGS. 3 to 7). Referring to FIG. 8, the front side and / or the rear side of the glass 100 may be observed.

Referring to (a) of FIG. 8, the glass 100 may include a flat plate portion 110. The pattern 200 may be formed on the glass 100. The pattern 200 may be positioned on the bending portion 120 formed by bending at the flat plate portion 110. For example, the pattern 200 may be formed in the first long side region LE1 and / or the second long side region LE2.

Referring to (b) of FIG. 8, the pattern 200 may be located on a part of the bending part 120. For example, the pattern 200 may be formed in some regions adjacent to the first short side SE1 or adjacent to the second short side SE2 among the first long side regions LE1. For example, the pattern 200 may be formed in a portion of the second long side region LE2 adjacent to the first short side SE1 or a portion adjacent to the second short side SE2. That is, the pattern 200 may be formed in a region adjacent to an end of a curved region of the glass 100.

At the end of the bending part 120 in which the glass 100 is bent, stress may be concentrated. Therefore, the pattern 200 formed in the region adjacent to the end can effectively reduce or / and disperse the stress.

FIG. 9 is a view showing region C shown in FIG. 8. Referring to FIG. 9 (a), the pattern 200 may be a wrinkle pattern 211, 221, and FIGS. 4 and 5). The pattern 200 may include a plurality of grooves. The plurality of grooves may be formed in parallel with the second long side (LE2, see FIG. 8). The longitudinal direction of the plurality of grooves may be parallel to the second long side (LE2, see FIG. 8). The cross sections of the plurality of grooves may have various shapes. The cross section of the pattern 200 may be a notch shape.

Referring to (b) of FIG. 9, the pattern 200 may be a slim pattern (213, 223, and FIGS. 6 and 7). The pattern 200 may have a curved shape. The pattern 200 may be concave toward the outside.

10 is a flowchart illustrating a glass bending method according to an embodiment of the present invention. 10 can be described in conjunction with FIGS. 1 to 9.

Referring to FIG. 10, the glass bending method S10 according to an embodiment of the present invention may include a glass patterning step S100 of forming a pattern 200 on the flat glass 101.

When the flat glass 101 passes through the glass patterning step (S100), the pattern 200 may be formed on the flat glass 101. The portion where the pattern 200 is formed may be bent later to become the bending portion 120.

In the glass patterning step S100, a method using physical etching may be considered. Physical etching may mean a method in which an object having a higher strength than the flat glass 101 applies pressure to the flat glass 101 to etch the flat glass 101.

In the glass patterning step S100, a method using optical etching may be considered. Optical etching may be performed, for example, by applying a laser to the flat glass 101. For example, a CO2 laser or an Nd-YAG laser may etch the flat glass 101 to perform patterning.

The glass patterning step (S100) may include a mask bonding step (S110) of bonding a mask to the flat glass 101. In the mask bonding step (S110), the mask may be coupled to the flat glass 101. An opening may be formed in the mask. The opening formed in the mask may correspond to the pattern 200.

The glass patterning step (S100) may include an etching step (S120) of etching the flat glass 101. In this step S120, chemical etching may be considered. For example, an etchant may be applied to the mask. When an etchant is applied to the mask, the flat glass 101 may be partially etched. The portion where the flat glass 101 is etched may correspond to an opening formed in the mask. In another example, plasma may be applied to the mask. The radical included in the plasma may partially etch the flat glass 101.

The glass patterning step (S100) may include a mask removing step (S130) of separating the mask from the flat glass 101. In the mask removal step (S130), the mask may be separated from the flat glass 101.

The glass bending method (S10) according to an embodiment of the present invention may include a glass bending step (S200) of bending the flat glass 101. In this step (S200), the flat glass 101 may be bent. In this step (S200), the flat glass 101 may be bent, for example, by a press device. Through this step (S200), the flat glass 101 may be converted into a curved glass 103.

The glass bending method S10 according to an embodiment of the present invention may include a glass strengthening step S300 of strengthening the curved glass 103. In this step (S300), the curved glass 103 may be strengthened through, for example, heat treatment or / and annealing treatment. Through this step (S300), the strength of the curved glass 103 can be improved.

The glass bending method S10 according to an embodiment of the present invention may include a cleaning step S400 of cleaning the curved glass 103. In this step (S400), a cleaning liquid may be applied to the curved glass 103. Through this step (S400), the surface of the curved glass 103 may be cleaned or / and cleaned.

The above description of the present invention is for illustration only, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present invention.

Forms for carrying out the invention have been described together in the best mode for carrying out the invention above.

According to the curved glass and glass bending method of the present invention, a pattern may be formed on the curved glass surface, and the curved glass may have relatively reduced stress.

Claims (7)

In the curved glass (curved glass) formed by bending a portion of the flat glass (flat glass) having a front (front) and (후면 面), A flat plate portion; A bending portion that is bent and extended from the flat plate portion; And It has a concave shape toward the outside from the bending portion, and includes a pattern formed in the bending portion, Curved glass. According to claim 1, The pattern, Located on the front surface of the bending portion, and includes a plurality of grooves (groove) formed parallel to the boundary of the flat plate portion and the bending portion, including a front wrinkle pattern, Curved glass. According to claim 1, The pattern, Located on the rear surface of the bending portion, including a plurality of grooves (groove) formed parallel to the boundary between the flat plate portion and the bending portion, including a back wrinkle pattern, Curved glass. According to claim 1, The pattern, Located on the front surface of the bending portion, and includes a front slim pattern formed parallel to the boundary between the flat plate portion and the bending portion, The thickness of the front slim pattern, Characterized in that the thickness of the area other than the front slim pattern is thinner, Curved glass. According to claim 1, The pattern, Located on the rear surface of the bending portion, and includes a rear slim pattern formed parallel to the boundary between the flat plate portion and the bending portion, The thickness of the rear slim pattern, Characterized in that it is thinner than the thickness of the area other than the rear slim pattern, Curved glass. In the glass bending method of bending the flat glass to form a curved glass, Forming a pattern on the flat glass, a glass patterning step (S100); Forming a curved glass by bending the flat glass at a portion where the pattern is located, a glass bending step (S200); Reinforcing the curved glass, glass strengthening step (S300); And Cleaning the curved glass, including a glass cleaning step (S400), The pattern, Characterized in that it has a concave shape toward the outside, Glass bending method (S10). The method of claim 6, The glass patterning step (S100), A mask bonding step of bonding a mask to the flat glass (S110); Etching the flat glass, an etching step (S120); And The step of removing the mask from the flat glass (S130), Glass bending method (S10).

Images