Method for manufacturing glazing

Abstract

A method of manufacturing a glazing includes: providing a glazing including a folded portion and a plurality of non-folded portions, the plurality of non-folded portions being spaced apart from each other and the folded portion being interposed between the plurality of non-folded portions; heating the window glass so that the folded portion is in a bent state; and polishing one surface of the folded portion in the bent state.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0103931, filed on August 5, 2024, and all benefits arising therefrom, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to a method of manufacturing window glass for display devices. More specifically, this disclosure relates to a method of manufacturing window glass included in foldable electronic devices. Background Technology

[0004] Various types of electronic devices are being developed, such as televisions, mobile phones, tablet computers, or gaming units. Recently, flexible electronic devices incorporating flexible display panels that are slidable or foldable are being developed.

[0005] Components included in flexible electronic devices need to be designed to enable the folding characteristics of the devices. Therefore, window glass used in flexible electronic devices needs to have improved folding characteristics in the folding areas. Summary of the Invention

[0006] This disclosure provides a window glass having grooves defined in it by a polishing process after it has been thermoformed for use in a display device.

[0007] This disclosure provides a method for manufacturing window glass capable of relieving internal stress when a display device is folded.

[0008] Embodiments of the present invention provide a method for manufacturing window glass. The method includes: providing window glass including a folded portion and a plurality of non-folded portions, the plurality of non-folded portions being spaced apart from each other and the folded portion being located between the plurality of non-folded portions; heating the window glass to cause the folded portion to be in a bent state; and polishing one surface of the folded portion in the bent state.

[0009] The window glass may include glass material, and when the window glass is heated, the folding portion may be heated at a temperature equal to or greater than about 500°C and equal to or less than about 750°C.

[0010] When heating window glass, the window glass can be heated for a time equal to or longer than approximately 10 seconds and equal to or shorter than approximately 120 seconds.

[0011] Polishing one surface of a folded portion may include: providing a multi-axis polishing machine; and using the multi-axis polishing machine to form grooves in the folded portion.

[0012] A multi-axis polishing machine may include: a clamping unit comprising a first plate and a clamping component, the first plate being movable in a first direction and a second direction intersecting each other in a plan view, the clamping component being disposed on the first plate and being rotatable; and a polishing unit comprising a second plate, a first polishing wheel and a second polishing wheel, the second plate being spaced apart from the first plate in a third direction intersecting the first and second directions and the second plate comprising a first surface facing the first plate and a second surface facing away from the first surface, the first polishing wheel being disposed on the first surface and being rotatable, and the second polishing wheel being disposed on the second surface and being rotatable.

[0013] Forming the groove may include: securing the window glass to the clamping component; moving the first polishing wheel in a direction toward the folded portion so that the first polishing wheel contacts the folded portion; and rotating the first polishing wheel to polish one surface of the folded portion.

[0014] Forming the groove may further include: providing a second polishing wheel in a direction toward the folded portion; moving the second polishing wheel in the direction toward the folded portion to bring the second polishing wheel into contact with the folded portion; and rotating the second polishing wheel to polish one surface of the folded portion.

[0015] Each of the first and second polishing wheels may include a polishing brush or a polishing pad.

[0016] The folded portion may include a flat portion formed by forming a groove and a plurality of inclined portions, the plurality of inclined portions being spaced apart from each other and the flat portion being between the plurality of inclined portions, and the plurality of inclined portions being inclined from the plurality of non-folded portions toward the flat portion.

[0017] Each of the plurality of inclined portions may have a first end and a second end having a predetermined curvature in the cross-sectional view, the first end being adjacent to a corresponding non-folded portion among the plurality of non-folded portions, and the second end being adjacent to a flat portion.

[0018] One surface of the folded portion may extend from a first surface of multiple non-folded portions facing each other in a bent state, or from a second surface of multiple non-folded portions facing away from the first surface.

[0019] When providing window glass, the window glass may have a thickness equal to or greater than about 0.05 mm and equal to or less than about 0.6 mm.

[0020] After polishing one surface of the folded portion, the folded portion may have a thickness equal to or greater than about 0.03 mm and equal to or less than about 0.1 mm, and the thickness of the folded portion may be less than the thickness of each of the plurality of non-folded portions.

[0021] Before providing the window glass, the method may also include providing the window pre-glass and cutting the window pre-glass.

[0022] Cutting window glass may include: performing one of the following processes on the window glass: scribing, water jetting, and laser cutting; and processing the cut surface of the window glass using computer numerical control (CNC) technology.

[0023] In the bent state, the angle between the facing portions of the surfaces of multiple non-folded parts can be equal to or less than approximately 90 degrees.

[0024] The first impact-absorbing component can be positioned between multiple non-folded sections.

[0025] The window glass can be provided in multiple forms. After heating the window glass and before polishing a surface, the method may also include a stacking process in which multiple window glass pieces can be stacked alternately and a second impact-absorbing member is placed between the multiple window glass pieces.

[0026] The method may further include: providing a first-side polishing wheel including a first-side rotation axis and a second-side polishing wheel including a second-side rotation axis parallel to the first-side rotation axis; and moving the plurality of window panes between the first-side polishing wheel and the second-side polishing wheel while the plurality of window panes are in contact with the first-side polishing wheel and the second-side polishing wheel to polish the side surfaces of the plurality of window panes.

[0027] Moving multiple window panes may also include rotating a first-side polishing wheel to polish the edges of the window panes and rotating a second-side polishing wheel to polish the folded portions of each of the multiple window panes, and the polishing of the edges and the polishing of the folded portions may be performed substantially simultaneously.

[0028] The method may also include chemically strengthening the window glass by replacing the first ion of the polished window glass with a second ion that is different from the first ion.

[0029] Based on the above, the method for manufacturing window glass reduces the cost and time required to manufacture window glass by mitigating the internal stress that occurs in the folded state, and provides window glass with improved foldable properties. Attached Figure Description

[0030] The above and other advantages of this disclosure will become apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0031] Figure 1A This is a perspective view of an electronic device according to an embodiment of the present disclosure;

[0032] Figure 1BThis is a perspective view of the folding operation of an electronic device according to an embodiment of the present disclosure;

[0033] Figure 1C This is a plan view of an electronic device in a folded state according to an embodiment of the present disclosure;

[0034] Figure 1D This is a perspective view of the folding operation of an electronic device according to an embodiment of the present disclosure;

[0035] Figure 2A This is a perspective view of an electronic device according to an embodiment of the present disclosure;

[0036] Figure 2B and Figure 2C This is a perspective view of the folding operation of an electronic device according to an embodiment of the present disclosure;

[0037] Figure 3 This is an exploded perspective view of an electronic device according to an embodiment of the present disclosure;

[0038] Figure 4 It is along Figure 3 A cross-sectional view of the display module taken by line I-I';

[0039] Figure 5 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure;

[0040] Figure 6 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure;

[0041] Figure 7 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure;

[0042] Figures 8 to 16 This is a view illustrating the process of manufacturing window glass according to an embodiment of the present disclosure;

[0043] Figure 17 This is a perspective view of a window pane according to an embodiment of the present disclosure;

[0044] Figure 18 This is a perspective view of a window pane according to an embodiment of the present disclosure;

[0045] Figure 19 It is along Figure 18 A cross-sectional view taken from line III-III';

[0046] Figure 20 This is a view illustrating the process of manufacturing window glass according to an embodiment of the present disclosure; and

[0047] Figure 21 and Figure 22 This is a view illustrating the process of manufacturing window glass according to an embodiment of the present disclosure. Detailed Implementation

[0048] This disclosure can be modified in various ways and implemented in many different forms, and therefore specific embodiments will be illustrated in the accompanying drawings and described in detail below. However, this disclosure should not be limited to the specific forms disclosed and should be construed as including all modifications, equivalents, or substitutions that are included within the spirit and scope of this disclosure.

[0049] In this disclosure, it will be understood that when an element (or region, layer, or portion) is referred to as being "on" another element or layer, "connected" to another element or layer, or "coupled" to another element or layer, the element (or region, layer, or portion) may be directly on, directly connected to, or directly coupled to the other element or layer, or there may be intermediary elements or intermediary layers.

[0050] The same reference numerals always denote the same elements. In the drawings, for the purpose of effective description of the technical content, the thickness, proportions, and size of components are exaggerated. As used herein, the term "and / or" can include any and all combinations of one or more of the associated listed items.

[0051] It will be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, the first element discussed below may be referred to as the second element. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” as used herein are also intended to include the plural forms.

[0052] For ease of description, spatial relative terms such as “below”, “under”, “lower”, “above” and “upper” may be used herein to describe the relationship of one element or feature to other elements or features as shown in the accompanying drawings.

[0053] It will be further understood that when the terms “comprising” and / or “including” are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or groups thereof.

[0054] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that, unless expressly defined herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and will not be interpreted in an idealized or overly formalized sense.

[0055] Given the measurements discussed and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system), the terms "about" or "substantially" as used herein include the stated values ​​and are intended to mean within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art. For example, "about" or "substantially" may mean within one or more standard deviations, or within ±10%, ±5%, or ±2% of the stated value. Embodiments of this disclosure will be described below with reference to the accompanying drawings.

[0056] Figure 1A This is a perspective view of an electronic device ED according to an embodiment of the present disclosure.

[0057] Figure 1A This is a perspective view of an electronic device ED in its unfolded state according to an embodiment of the present disclosure.

[0058] An electronic device (ED) can be a device that is activated in response to an electrical signal. As examples, an electronic device (ED) can be a mobile phone, tablet computer, car navigation unit, gaming unit, or wearable device; however, it should not be limited to or restricted by these. Figure 1A A foldable electronic device ED is shown as a representative example. Figures 1A to 1D The image shows a mobile phone as a representative example of a foldable electronic device (ED).

[0059] The electronic device ED may include a first display surface FS defined by a first direction DR1 and a second direction DR2 intersecting the first direction DR1. The electronic device ED may provide an image IM to a user through the first display surface FS. The electronic device ED may display the image IM toward a third direction DR3 through the first display surface FS, the first display surface FS being substantially parallel to each of the first direction DR1 and the second direction DR2.

[0060] In this disclosure, the first direction DR1 may be perpendicular to the second direction DR2, and the third direction DR3 may be a normal direction relative to the plane defined by the first direction DR1 and the second direction DR2. The thickness direction of the electronic device ED may be substantially parallel to the third direction DR3, which may also be referred to as the thickness direction DR3. The front surface (or upper surface) and the rear surface (or lower surface) may face away from each other on the third direction DR3, and the normal direction of each of the front surface (or upper surface) and the rear surface (or lower surface) may be substantially parallel to the third direction DR3.

[0061] The front surface (or upper surface) may refer to a surface relatively close to the first display surface FS, and the rear surface (or lower surface) may refer to a surface relatively far from the first display surface FS. Furthermore, the rear surface (or lower surface) may refer to a surface relatively close to the second display surface RS, which will be described later. The upper side (or upper portion) may refer to a direction approaching the first display surface FS, and the lower side (or lower portion) may refer to a direction away from the first display surface FS.

[0062] The cross-section of each component refers to a flat surface parallel to the thickness direction DR3, and the plane of each component refers to a flat surface perpendicular to the thickness direction DR3. The plane is defined by the first direction DR1 and the second direction DR2.

[0063] The electronic device ED can sense external inputs applied to it from outside the electronic device ED. External inputs can include various forms of input provided from outside the electronic device ED. For example, external inputs can include proximity inputs (e.g., hovering) applied when approaching or adjacent to the electronic device ED at a predetermined distance, and touch inputs via the user's body (e.g., the user's hand). Furthermore, external inputs can be provided in the form of force (such as pressure), temperature, light, etc.

[0064] The electronic device ED may include a first display surface FS and a second display surface RS. The first display surface FS may include a first active region F-AA, a first peripheral region F-NAA, and an electronic module region EMA. The second display surface RS may be opposite to at least a portion of the first display surface FS. That is, the second display surface RS may be defined as part of the rear surface of the electronic device ED.

[0065] The first active area F-AA can be activated in response to an electrical signal. The electronic device ED can display an image IM through the first active area F-AA and can also sense various external inputs through the first active area F-AA.

[0066] Image IM may not be displayed through the first peripheral region F-NAA. The first peripheral region F-NAA may be defined adjacent to the first active region F-AA. The first peripheral region F-NAA may have a predetermined color. The first peripheral region F-NAA may surround the first active region F-AA. Therefore, the first active region F-AA may have a shape substantially defined by the first peripheral region F-NAA; however, this is merely an example. The first peripheral region F-NAA may be defined adjacent to only one side of the first active region F-AA, or it may be omitted.

[0067] Various electronic modules can be arranged in the electronic module area EMA. For example, the electronic module may include at least one of a camera, a speaker, an optical sensor, and a thermal sensor. External objects can be sensed through the electronic module area EMA of the first display surface FS or the second display surface RS, or sound signals such as voice can be provided to the outside through the electronic module area EMA of the first display surface FS or the second display surface RS. Furthermore, the electronic module may include multiple components; however, it should not be limited to a particular embodiment.

[0068] The electronic module region EMA may be surrounded by a first peripheral region F-NAA; however, it should not be limited to or restricted by this. As an example, the electronic module region EMA may be surrounded by a first active region F-AA and a first peripheral region F-NAA, and the electronic module region EMA may be confined within the first active region F-AA.

[0069] An electronic device ED may include at least one folded region FA and a plurality of non-folded regions NFA1 and NFA2 extending from the folded region FA. As an example, the first non-folded region NFA1, the folded region FA, and the second non-folded region NFA2 may be sequentially defined along a second direction DR2. The second non-folded region NFA2 may be spaced apart from the first non-folded region NFA1 in the second direction DR2, and the folded region FA may be located between the second non-folded region NFA2 and the first non-folded region NFA1. For example, the first non-folded region NFA1 may be disposed on one side of the folded region FA in the second direction DR2, and the second non-folded region NFA2 may be disposed on the other side of the folded region FA in the second direction DR2.

[0070] Figure 1A The diagram shows an electronic device ED comprising a folded region FA as a representative example; however, this disclosure should not be limited thereto or thereby restricted, and the electronic device ED may include multiple folded regions defined within it. As an example, the electronic device may include two or more folded regions and three or more non-folded regions arranged with the folded regions interposed therebetween.

[0071] Figure 1B This is a perspective view of the folding operation of an electronic device ED according to an embodiment of the present disclosure. Figure 1C This is a plan view of an electronic device ED in a folded state according to an embodiment of the present disclosure. Figure 1D This is a perspective view of the folding operation of an electronic device ED according to an embodiment of the present disclosure.

[0072] refer to Figure 1B The electronic device ED can be folded relative to a first folding axis FX1 extending in a first direction DR1. When the electronic device ED is folded, the folding region FA can have a predetermined curvature and radius of curvature. The electronic device ED can be folded inward relative to the first folding axis FX1 (inward folding) so that the first non-folding region NFA1 faces the second non-folding region NFA2 and the first display surface FS is not exposed to the outside.

[0073] refer to Figure 1C When the electronic device ED is folded inward, the second display surface RS can be seen by the user. In this case, the second display surface RS may include an image (reference). Figure 1A The image IM is displayed through its second active area R-AA. The second active area R-AA can be activated in response to an electrical signal. The image IM can be displayed through the second active area R-AA, and various external inputs can be sensed through the second active area R-AA.

[0074] Furthermore, the second display surface RS may include a second peripheral region R-NAA. The second peripheral region R-NAA may be defined adjacent to the second active region R-AA. The second peripheral region R-NAA may have a predetermined color. The second peripheral region R-NAA may surround the second active region R-AA. Although in Figure 1C Not shown, but the electronic device ED may also include an electronic module area (see reference). Figure 1A The electronic module area (EMA) is where electronic modules, including various components, are disposed in the second display surface RS.

[0075] According to an embodiment, when the electronic device ED is folded inward, the distance between the first non-folded region NFA1 and the second non-folded region NFA2 can be less than the radius of the circle defined by the radius of curvature of the folded region FA. In this case, the folded region FA can be folded into a dumbbell shape, and the distance between the first non-folded region NFA1 and the second non-folded region NFA2 can be reduced. Therefore, the electronic device ED can be thinned in the folded state.

[0076] refer to Figure 1DThe electronic device ED can be folded relative to a second folding axis FX2 extending in the first direction DR1. The electronic device ED can be folded outward relative to the second folding axis FX2 (outward folding) to expose the first display surface FS to the outside. The electronic device ED can be configured to repeatedly unfold and inward folding operations or repeatedly unfold and outward folding operations; however, this disclosure should not be limited thereto or thereby restricted.

[0077] at the same time, Figures 1A to 1D An electronic device ED folded relative to a folding axis FX1 or FX2 is shown; however, the number of folding axes and the number of non-folded areas should not be particularly limited. As an example, the electronic device ED can be folded relative to multiple folding axes such that a portion of a first display surface FS faces another portion of the first display surface FS and a portion of a second display surface RS faces another portion of the second display surface RS. Furthermore, in the above embodiment, the first folding axis FX1 and the second folding axis FX2 are shown as parallel to the long side of the electronic device ED; however, this disclosure should not be limited to or construed as such. According to an embodiment, the first folding axis FX1 and the second folding axis FX2 can be substantially parallel to the short side of the electronic device ED.

[0078] In the electronic device ED, the first non-folding region NFA1 and the second non-folding region NFA2 can be defined as respectively including as follows: Figure 1D The regions shown in the diagram, in their folded state, are parallel to the plane defined by the first direction DR1 and the second direction DR2, and the folded region FA can be defined as the area between the first non-folded region NFA1 and the second non-folded region NFA2. The folded region FA may include a curved portion having a predetermined curvature in the folded state.

[0079] Conventional foldable electronic devices include a window pane whose basic shape is its unfolded form when no external force is applied. However, users typically use foldable electronic devices in a folded state for longer periods of time (such as when carrying them, when idle, or when using them through a second active area) compared to when using them in an "unfolded state." Figure 1C (When viewing the image IM in the second active region R-AA). In this case, in the folded state, the internal stress of the window glass, which has an unfolded form as its basic shape, increases, leading to a decrease in the reliability of the electronic devices.

[0080] However, according to the method for manufacturing window glass disclosed herein, the window glass is formed into a folded state at a certain angle as its basic shape through a thermoforming process, and then a polishing process is performed on the folded window glass. Therefore, the size of the electronic device ED in the folded area FA (see reference) can be easily reduced. Figure 1BThe thickness of the window glass manufactured according to this disclosure is [not specified]. Therefore, the internal stress of the electronic device ED in the folded state can be alleviated, and the folding characteristics of the electronic device ED can be improved. Furthermore, the reliability of the display device ED can be improved.

[0081] Figures 2A to 2C This is a perspective view of the electronic device ED-a.

[0082] Figure 2A This is a perspective view of an electronic device ED-a according to an embodiment of the present disclosure. Figure 2A This is a perspective view of the electronic device ED-a in its unfolded state. Figure 2B and Figure 2C This is a perspective view of the folding operation of the electronic device ED-a according to an embodiment of the present disclosure. Figure 2B It is shown Figure 2A The image shows a perspective view of the inward folding operation of the electronic device ED-a. Figure 2C It is shown Figure 2A The image shows a perspective view of the outward folding operation of the electronic device ED-a. Figure 2B The electronic device ED-a in the first mode is shown, and Figure 2C The electronic device ED-a in the second mode is shown.

[0083] refer to Figure 2A The electronic device ED-a can be folded relative to a third folding axis FX3 extending in a direction substantially parallel to the first direction DR1. The direction in which the third folding axis FX3 extends can be substantially parallel to the direction in which the short side of the electronic device ED-a extends.

[0084] The electronic device ED-a may include a folded region FA-a, a first non-folded region NFA1-a adjacent to one side of the folded region FA-a, and a second non-folded region NFA2-a adjacent to the other side of the folded region FA-a. The first non-folded region NFA1-a may be spaced apart from the second non-folded region NFA2-a, and the folded region FA-a is located between the first non-folded region NFA1-a and the second non-folded region NFA2-a.

[0085] The folding region FA-a can be folded relative to the third folding axis FX3. When the electronic device ED-a is folded, the folding region FA-a can have a predetermined curvature and radius of curvature. The electronic device ED-a can be folded inward (inward folding) so that the first non-folding region NFA1-a faces the second non-folding region NFA2-a and the display surface FS-a is not exposed to the outside.

[0086] refer to Figure 2A When the electronic device ED-a is in the unfolded state, the display surface FS-a can be seen by the user. (Similar to reference...) Figures 1A to 1D The description states that the display surface FS-a of the electronic device ED-a may include an active area F-AAa and a peripheral area F-NAAa. An image IM can be displayed through the active area F-AAa, and various external inputs can be sensed through the active area F-AAa.

[0087] refer to Figure 2B When the electronic device ED-a is folded inward, the rear surface RS-a becomes visible to the user. As an example, the rear surface RS-a can serve as a second display surface through which an image IM is displayed. Furthermore, the rear surface RS-a may include an electronic module area (see reference) where an electronic module comprising various components is disposed. Figure 1A The electronic module area (EMA). In the rear surface RS-a of the electronic device ED-a, the active area through which the image IM is displayed can be further defined.

[0088] refer to Figure 2C The electronic device ED-a can be folded relative to the third folding axis FX3 so that the portion of the rear surface RS-a that overlaps with the first non-folded region NFA1-a faces the other portion of the rear surface RS-a that overlaps with the second non-folded region NFA2-a.

[0089] Figure 3 This is an exploded perspective view of an electronic device ED according to an embodiment of the present disclosure. The following description of the electronic device ED can be applied to reference. Figures 2A to 2C The described electronic device is ED-a.

[0090] refer to Figure 3 The electronic device ED may include a window WL, a display module DM, an optical layer RPL, a lower film PM, a support plate SK, a lower plate MP, and a housing HAU.

[0091] The housing HAU can be coupled to the window WL to define the appearance of the electronic device ED. The housing HAU can include a material with relatively high rigidity. As an example, the housing HAU can include multiple frames and / or multiple panels formed of glass, plastic, or metal. The housing HAU can provide a predetermined receiving space. The display module DM can be housed in the receiving space and can be protected from external impacts. According to an embodiment, the housing HAU may also include a hinge structure disposed overlapping the folding area FA to guide the folding operation of the electronic device ED.

[0092] The display module DM can be disposed below the optical layer RPL. The display module DM can be activated in response to an electrical signal. The activated display module DM can be activated through the first active region F-AA of the electronic device ED (reference). Figure 1A ) Display image IM (reference) Figure 1AThe display module DM may include a display area DM-AA and a non-display area DM-NAA defined within the display module DM. The display area DM-AA may be activated in response to an electrical signal. The non-display area DM-NAA may be defined adjacent to at least one side of the display area DM-AA. Circuitry or lines for driving the display area DM-AA may be provided in the non-display area DM-NAA.

[0093] An optical layer RPL can be disposed between the display module DM and the window WL. The optical layer RPL can be an anti-reflective layer used to reduce the reflectivity of the display module DM relative to external light incident on the display module DM from the outside. The optical layer RPL can be formed on the display module DM through a continuous process. The optical layer RPL may include a polarizer or a color filter layer. As an example, the optical layer RPL may include at least one of a phase retarder, a polarizer, a polarizing film, and a polarizing filter. According to an embodiment, the optical layer RPL may include a plurality of color filters arranged in a predetermined manner and a black matrix disposed adjacent to the color filters.

[0094] Image IM (reference) generated by display module DM Figure 1A It can be provided to the user after passing through the window WL. The window WL may include a polymer substrate or a glass substrate.

[0095] The window WL may include a protective layer PF and a window glass WG. The protective layer PF and the window glass WG may include optically transparent insulating materials. In this embodiment, the window WL may include glass material.

[0096] The protective layer PF can be applied above the window glass WG. The protective layer PF can function as a functional layer to protect the upper surface of the window glass WG. The protective layer PF may include a polymer film.

[0097] The window glass WG can have a shape in which the portion overlapping the folding area FA is etched in two directions parallel to the third direction DR3 (i.e., the third direction DR3 and the opposite directions of the third direction DR3).

[0098] The lower film (PM) protects the lower portion of the display panel (DP). The lower film (PM) can include a flexible plastic material. As an example, the lower film (PM) can be polyethylene terephthalate (PET).

[0099] The support plate SK can be positioned below the display panel DP. A portion of the support plate SK can be bent to absorb impacts applied to the components positioned above the support plate SK and the housing HAU. Furthermore, the support plate SK prevents foreign objects from entering the components positioned above the support plate SK.

[0100] A lower plate MP may be disposed below a support plate SK. The lower plate MP may have a plurality of holes HL defined to pass through the lower plate MP and overlap with the folding area FA, so that the electronic device ED can be easily folded. The lower plate MP may comprise a metallic material. As an example, the lower plate MP may comprise one of aluminum (Al) and molybdenum (Mo); however, it should not be limited to or construed as such. According to an embodiment, the lower plate MP may comprise a matrix containing filler and fiber threads woven and disposed within the matrix.

[0101] The fiber filament may include a reinforcing fiber composite material. The reinforcing fiber composite material may be one of carbon fiber reinforced plastic (CFRP) and glass fiber reinforced plastic (GFRP). A single fiber included in a fiber filament may have a diameter equal to or greater than about 3 μm and equal to or less than about 10 μm.

[0102] The matrix may include at least one of epoxy resin, polyester, polyamide, polycarbonate, polypropylene, polybutene, and vinyl ester.

[0103] The matrix may include fillers. Fillers may include at least one of silica, barium sulfate, sintered talc, barium titanate, titanium dioxide, clay, bauxite, mica, boehmite, zinc borate, and zinc stannate.

[0104] Although not shown in the accompanying drawings, the electronic device ED may also include at least one of a buffer layer and a shielding layer. The buffer layer prevents the lower plate MP from being pressed and deformed by external impacts and forces. The buffer layer may include sponge, foam, or an elastomer such as urethane resin. Furthermore, the buffer layer may include at least one of acrylic polymers, urethane polymers, silicone polymers, and imide polymers; however, it should not be limited thereto or thereby restricted. The electronic device ED may be an electromagnetic shielding layer or a heat dissipation layer.

[0105] The electronic device ED may further include a first adhesive layer AD1, a second adhesive layer AD2, a third adhesive layer AD3, a fourth adhesive layer AD4, a fifth adhesive layer AD5, and a sixth adhesive layer AD6. The first adhesive layer AD1 may be disposed between the window glass WG and the protective layer PF. The second adhesive layer AD2 may be disposed between the optical layer RPL and the window glass WG. The third adhesive layer AD3 may be disposed between the display module DM and the optical layer RPL. The fourth adhesive layer AD4 may be disposed between the lower film PM and the display module DM. The fifth adhesive layer AD5 may be disposed between the support plate SK and the lower film PM. The sixth adhesive layer AD6 may be disposed between the lower plate MP and the support plate SK.

[0106] The first adhesive layers AD1 through the sixth adhesive layers AD6 and the adhesive components described later may include conventional adhesives such as pressure-sensitive adhesives (PSA), optically clear adhesives (OCA), or optically clear resins (OCR), but should not be particularly limited thereto. According to embodiments, at least one of the first adhesive layers AD1 through the sixth adhesive layers AD6 may be omitted.

[0107] Figure 4 It is along Figure 3 The cross-sectional view of the display module DM is taken by line I-I'.

[0108] refer to Figure 4 The display module DM may include a display panel DP and an input sensing layer ISP disposed on the display panel DP.

[0109] The display panel DP can essentially generate an image IM (reference). Figure 1A The configuration of the display panel DP. The display panel DP can be a light-emitting display panel. For example, the display panel DP can be an organic light-emitting display panel, an inorganic light-emitting display panel, a micro light-emitting diode (LED) display panel, a micro organic light-emitting diode (OLED) display panel, or a nano LED display panel.

[0110] The display panel (DP) may include a substrate layer (BS), a circuit element layer (DP-CL), a display element layer (DP-EL), and a packaging layer (TFE) stacked sequentially.

[0111] The substrate layer BS can provide a substrate surface on which the circuit element layer DP-CL is disposed. The substrate layer BS can be a flexible substrate that is bendable, foldable, or rollable. The substrate layer BS can be a glass substrate, a metal substrate, or a polymer substrate; however, it should not be limited to or restricted by these. According to embodiments, the substrate layer BS can be an inorganic layer, an organic layer, or a composite material layer.

[0112] The matrix layer BS can have a single-layer or multi-layer structure. For example, the matrix layer BS may include a first synthetic resin layer, an inorganic layer having a single-layer or multi-layer structure, and a second synthetic resin layer disposed on the inorganic layer having a single-layer or multi-layer structure. Each of the first and second synthetic resin layers may include a polyimide resin. Furthermore, each of the first and second synthetic resin layers may include at least one selected from acrylic resins, methacrylic resins, polyisoprene resins, vinyl resins, epoxy resins, urethane resins, cellulose resins, siloxane resins, polyamide resins, and perylene resins. Additionally, in this disclosure, the term "X-type resin" as used herein refers to a resin containing a functional group including X.

[0113] The circuit element layer DP-CL can be disposed on the substrate layer BS. The circuit element layer DP-CL may include an insulating layer, semiconductor patterns, and conductive patterns such as signal lines. The display element layer DP-EL can be disposed on the circuit element layer DP-CL. The display element layer DP-EL may include a light-emitting element (not shown). As an example, the light-emitting element may include organic light-emitting materials, inorganic light-emitting materials, organic-inorganic light-emitting materials, quantum dots, quantum rods, micro LEDs, or nano LEDs.

[0114] A TFE (Transmission Equipment) encapsulation layer can be disposed on the Display Element Layer (DP-EL). The TFE protects the DP-EL from moisture, oxygen, and foreign matter such as dust particles. The TFE may include at least one inorganic layer. As an example, the TFE may include inorganic, organic, and inorganic layers stacked sequentially.

[0115] The input sensing layer (ISP) can be disposed on the display panel (DP). The ISP can also be directly disposed on the encapsulation layer (TFE); however, this disclosure should not be limited thereto or thereby restricted. According to an embodiment, an adhesive component can be disposed between the input sensing layer (ISP) and the display panel (DP).

[0116] In this disclosure, the phrase "a component is directly disposed on another component" means that no third component is disposed between the component and the other component. For example, when a component is "directly disposed" on another component, it means that the component and the other component are "in contact" with each other.

[0117] An input sensing layer (ISP) can sense external input, convert the sensed input into a predetermined input signal, and provide the input signal to a display panel (DP). As an example, an input sensing layer (ISP) can be a touch sensing layer that senses touch events. An input sensing layer (ISP) can sense direct touches from a user, indirect touches from a user, direct touches from an object, or indirect touches from an object.

[0118] The input sensing layer (ISP) can sense at least one of the location and intensity (pressure) of an externally applied touch event. The ISP can have various structures or may include various materials, but should not be limited thereto. As an example, the ISP can sense external input capacitively. The display panel (DP) can receive the input signal from the ISP and can generate an image (IM) corresponding to the input signal (see reference). Figure 1A ).

[0119] Figure 5 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure.

[0120] A method for manufacturing window glass (or a method for producing window glass) may include: providing window glass (S300), said window glass including folded portions and non-folded portions, the non-folded portions being spaced apart from each other and the folded portions being located between the non-folded portions; heating the window glass to cause the folded portions to be in a bent state (S400, since this step can also be described as performing a thermoforming process, and therefore, S400 is also used to represent a thermoforming process in the following text); and polishing one surface of the folded portions in the bent state (S500, since this step can also be described as performing a polishing process, and therefore, S500 is also used to represent a polishing process in the following text).

[0121] Furthermore, prior to providing the window glass (S300), the method of manufacturing the window glass may also include providing a mother glass (hereinafter referred to as the window mother glass) from which the window glass is cut (S100) and cutting the window mother glass (S200).

[0122] Furthermore, after polishing one surface of the folded portion (S500), the method for manufacturing the window glass may also include strengthening the window glass (S600, since this step can also be described as a chemical strengthening process, and therefore, S600 is also used to refer to a chemical strengthening process in the following text). Strengthening the window glass (S600) may include a chemical strengthening process in which a first ion in the polished window glass is replaced with a second ion different from the first ion.

[0123] Figure 6 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure.

[0124] refer to Figure 6 Polishing one surface of the folded portion in the bent state (S500) may include: providing a multi-axis polishing machine (S510); and using the multi-axis polishing machine to form a groove in the folded portion (S520).

[0125] Figure 7 This is a flowchart illustrating a method for manufacturing window glass according to an embodiment of the present disclosure.

[0126] refer to Figure 7 Forming a groove in the folded portion (S520) may include: fixing the window glass to the clamping component (S521); moving the first polishing wheel in the direction toward the folded portion to contact the folded portion (S522); and rotating the first polishing wheel to polish one surface of the folded portion (S523).

[0127] Figures 8 to 16 This is a view illustrating the process of manufacturing window glass according to an embodiment of the present disclosure.

[0128] In the following text, reference will be made to Figures 8 to 16 Describe each process in the manufacturing method of window glass.

[0129] refer to Figure 8 and Figure 9 It can perform the provision of window glass (S100, reference) Figure 5 ) and cut window pre-glass (S200, reference) Figure 5 ).

[0130] Figure 8 The process of cutting the mother glass MG using the first polishing tool TP1 is shown. Figure 8 The first polishing tool TP1 shown may be a laser cutter; however, this disclosure should not be limited thereto or thereby restricted. According to embodiments, the window glass MG can be cut by other processes such as scribing, waterjet processing, etc.

[0131] In this embodiment, the first polishing tool TP1 can irradiate a laser beam along the cutting line CTL to cut the window glass MG.

[0132] Figure 9 Four window panes (WG) manufactured by cutting a single window master glass (MG) are shown as a representative example; however, the number of window panes (WG) manufactured by cutting a single window master glass (MG) should not be specifically limited.

[0133] The cut surface WS of the cut window slab MG can be processed using a laser processing tool TP2, which is used in computer numerical control (CNC) technology. The cut surface WS of the window slab MG can be referred to as the "side surface of the window slab WG". That is, the side surface WS of the window slab WG can be processed using a laser processing tool TP2, which can improve the surface quality of the side surface WS of the window slab WG.

[0134] The window glass WG can have a thickness WH that is equal to or greater than about 0.05 mm and equal to or less than about 0.6 mm. In this embodiment, the window glass WG can be ultra-thin glass (UTG).

[0135] One surface of the window glass WG can be processed by a polishing process described later, and the one surface of the window glass WG can be a first surface S1 of the window glass WG or a second surface S2 opposite to the first surface S1.

[0136] Then, refer to Figure 10 It can perform the heating and thermoforming process of window glass S400 (reference). Figure 5 ).

[0137] Hot forming process S400 (reference) Figure 5This may include bending the window glass WG to have a predetermined curvature and heating the window glass WG in the bent state.

[0138] In the hot forming process S400 (reference) Figure 5 In this process, the window glass WG can be bent, and the bent window glass WG can be heated to change the basic shape of the window glass WG.

[0139] Perform thermoforming process S400 (reference) Figure 5 Previous window glass WG could have a flat shape as its basic shape; however, it undergoes a thermoforming process S400 (see reference). Figure 5 The window glass WG after that can have a bent shape as its basic shape.

[0140] When an external force is applied to a flat window pane (WG) to maintain its bent shape, internal stress may be generated within the window pane (WG). However, when the window pane (WG) is formed into a bent state, the internal stress generated by maintaining its bent state can be relieved.

[0141] Figure 10 The process of bending window glass WG using a curvature forming device CP is shown.

[0142] The curvature forming apparatus CP may include a chamber CB, a pressing member CC placed within the chamber CB, a heat source HS, and a support member SM. The support member SM may have an upwardly convex shape. The pressing member CC can move in a downward direction to bend the window glass WG to correspond to the shape of the support member SM. The window glass WG in its bent state can be heated by the heat source HS. The bent window glass WG can be annealed. Therefore, the internal stress of the window glass WG in its bent state can be relieved, and the structure of the material can be stabilized.

[0143] In this embodiment, the window glass WG (specifically, the folded portion FP) can be heated at a temperature equal to or greater than about 500°C and equal to or less than about 750°C. Specifically, the window glass WG can be heated at a temperature equal to or greater than about 620°C and equal to or less than about 720°C.

[0144] In this embodiment, in the thermoforming process S400, the window glass WG can be heated for a time equal to or longer than about 10 seconds and equal to or shorter than about 120 seconds.

[0145] refer to Figure 11 Multi-axis polishing machines (AE) can be provided for polishing window glass (WG). Figure 9 Polishing is then performed.

[0146] A multi-axis polishing machine (AE) can be a 5-axis polishing machine. A multi-axis polishing machine (AE) can perform a precise polishing process by moving the polishing position in the first direction DR1 to the third direction DR3 based on the object to be polished, or by rotating in two or more directions.

[0147] In this embodiment, the multi-axis polishing machine AE may include a fixture unit JU and a polishing unit AU.

[0148] The fixture unit JU can be an assembly on which a window glass WG is placed and fixed for polishing. The fixture unit JU can move in a first direction DR1 and a second direction DR2. Figure 11 The jig unit JU is shown in dashed lines moving along a first axis LX1 and a second axis LX2 that are substantially parallel to the second direction DR2 and the first direction DR1, respectively.

[0149] The fixture unit JU may include a first plate PT1 and a fixture component JP disposed on the first plate PT1.

[0150] In this embodiment, the clamping component JP may have a plate shape. The clamping component JP may provide a window glass WG (see reference) mounted thereon. Figure 9 The substrate surface of the ). Although not shown in the figures, the clamping component JP may have a vacuum suction hole defined therein, and the window glass WG (reference) disposed thereon can be fixed thereon. Figure 9 However, this disclosure should not be limited thereto or thereby, and the clamping component JP should not be particularly limited, provided that the clamping component JP can secure the bent window glass WG (see reference). Figure 9 And it allows the bent window glass WG to rotate. As an example, the clamp component JP can be provided in the form of clamps to secure the bent window glass WG (see reference). Figure 9 ).

[0151] The clamping component JP can rotate in one direction. In this embodiment, the clamping component JP can rotate about a first rotation axis RX1 that is substantially parallel to the third direction DR3. When the clamping component JP rotates, the window glass WG (reference) disposed on the clamping component JP... Figure 9 It can also be rotated.

[0152] Figure 11 Two fixture components JP are shown as a representative example; however, the number of fixture components JP used in a single process should not be limited to two.

[0153] The polishing unit AU may include a second plate PT2 and polishing wheels PW1 and PW2 disposed on the second plate PT2. The polishing unit AU may be substantially for window glass WG (reference). Figure 9 ) Components that are polished.

[0154] The polishing unit AU can be moved on the third direction DR3. Figure 11 The polishing unit AU is shown as a dashed line, indicating that it can move along a third axis LX3 parallel to the third direction DR3. The polishing unit AU can move towards the window glass WG (reference) mounted on the fixture component JP. Figure 9 Move in the direction of ) or away from the window glass WG (reference) Figure 9 Move in the direction of ).

[0155] Based on the movement of the polishing unit AU, the polishing wheels PW1 and PW2 interact with the window glass WG (reference). Figure 9 The contact between the polishing wheels PW1 and PW2 and the window glass WG (see reference) can be varied. According to an embodiment, this can be achieved by adjusting the contact between the polishing wheels PW1 and PW2 and the window glass WG (see reference). Figure 9 The depth of contact is used to precisely control the formation on the window glass (WG). Figure 9 The groove GR in ) (reference) Figure 19 ) depth.

[0156] The polishing unit AU can rotate around the second direction DR2. Figure 11 The structure of the polishing unit AU rotating about a third rotation axis RX3 parallel to the second direction DR2 is shown as a representative example.

[0157] As the polishing unit AU rotates, the type of polishing wheel PW1 or PW2 that contacts the window glass WG can change. As an example, when the polishing unit AU is in... Figure 11 When moving downwards in the state shown, the first polishing wheel PW1 can make contact with the window glass WG (reference). Figure 12 However, when the polishing unit AU rotates 180° around the third rotation axis RX3 and moves downward, the second polishing wheel PW2 can contact the window glass WG (reference). Figure 12 )touch.

[0158] Polishing wheels PW1 and PW2 can rotate about the second-second rotation axis RX2-2 to polish the window glass WG. Polishing wheels PW1 and PW2 can be polishing brushes, polishing sponges, or polishing pads.

[0159] The second plate PT2 can be spaced apart from the first plate PT1 on the third-direction DR3. In this embodiment, the second plate PT2 may include a first surface facing the first plate PT1 and a second surface facing away from the first surface. The first polishing wheel PW1 may be disposed on the first surface, and the second polishing wheel PW2 may be disposed on the second surface. Figure 11 A representative example is shown where a polishing brush is provided as a first polishing wheel PW1 on one surface of the second plate PT2 and a polishing pad is provided as a second polishing wheel PW2 on the surface opposite to the one surface of the second plate PT2.

[0160] The first polishing wheel PW1 can rotate to polish the window glass WG (reference). Figure 9 Polishing is performed using the second polishing wheel PW2. The second polishing wheel PW2 can rotate more precisely than the first polishing wheel PW1 to finish the window glass WG (reference). Figure 9 The polished surface of the glass can thus improve the appearance of the window glass (refer to WG). Figure 9 ) surface quality.

[0161] However, the number and type of polishing wheels PW1 and PW2 should not be particularly limited, as long as they can polish the window glass WG. Different types of polishing wheels can be additionally provided on another surface of the second plate PT2. According to an embodiment, the number of each of the polishing wheels PW1 and PW2 provided in the second plate PT2 can be one, three, or more.

[0162] In the following text, reference will be made to Figures 12 to 17 The description describes polishing one surface of the folded portion in a bent state (S500, reference). Figure 5 ).

[0163] exist Figures 12 to 17 In the following description, references will be omitted. Figures 7 to 11 The details of the same components as those described. Furthermore, for ease of explanation, in Figures 12 to 17 The fixture unit JU for fixing the window glass WG is omitted (see [reference]). Figure 11 It also provides four first polishing wheels PW1 and four second polishing wheels PW2.

[0164] refer to Figure 12 The window glass WG may include a second surface S2 and a first surface S1 opposite to the second surface S2. In the bent state, one part of the second surface S2 faces the other part.

[0165] A groove is formed in the folded portion (S520, reference). Figure 7 The method may include: securing the window glass WG to the clamping component JP; moving the first polishing wheel PW1 in a direction toward the folded portion FP to contact the folded portion FP; and rotating the first polishing wheel PW1 to polish one surface of the folded portion FP.

[0166] Figure 13 The first polishing wheel PW1 is shown in the direction of the folded portion FP (see reference). Figure 12 After moving in the direction of ), it comes into contact with the folded part FP. Figure 13 It is along Figure 12 The cross-sectional view taken from line II-II'.

[0167] refer to Figure 13The first polishing wheel PW1 can rotate about the second-first rotation axis RX2-1 to form a preliminary groove P-GR in the first surface S1 of the folded portion FP of the window glass WG. In this disclosure, the term "preliminary groove P-GR" can refer to a portion of the window glass WG that has been polished but not yet completed as groove GR.

[0168] Figure 14 This shows the state where the window glass WG has moved along the second direction DR2 and the first polishing wheel PW1 has moved upward along the third direction DR3.

[0169] refer to Figure 14 As the window glass WG moves left and right along the second direction DR2, the left and right width of the initial groove P-GR can be adjusted. For example, when the window glass WG moves to the right along the second direction DR2, the first polishing wheel PW1 can move to the left relative to the window glass WG. Therefore, the window glass WG can be further polished.

[0170] As the first polishing wheel PW1 moves up and down along the third direction DR3, the depth of the initial groove P-GR can be adjusted. For example, when the first polishing wheel PW1 moves upwards, the depth of the initial groove P-GR can be reduced.

[0171] refer to Figure 15 The window glass WG can move to the left in the direction opposite to the second direction DR2, and the first polishing wheel PW1 can move upward in the third direction DR3. Therefore, the initial groove P-GR can be further polished.

[0172] For reference Figures 13 to 15 As mentioned above, due to the use of a multi-axis polishing machine AE (reference) Figure 11 The manufacturing method for window glass is executed, thus allowing for precise shaping of the groove GR. In other words, because the multi-axis polishing machine AE can adjust the polishing unit AU (reference...) Figure 11 ) and fixture unit JU (reference) Figure 11 The relative movement between the two directions causes the window glass WG to move along the first direction DR1, the second direction DR2 and the third direction DR3, thus allowing for precise adjustment of the etched position and shape of the window glass WG.

[0173] refer to Figure 16 The polishing unit AU can rotate about the third rotation axis RX3. The polishing unit AU can rotate about 180° so that the second polishing wheel PW2 faces the window glass WG.

[0174] Then, the polishing unit AU can move in the downward direction to bring the second polishing wheel PW2 into contact with the window glass WG, and the second polishing wheel PW2 can rotate to further polish the groove GR.

[0175] A groove is formed in the folded portion (S520, reference). Figure 7 It may also include: in the direction of the folded portion FP (refer to...) Figure 12 Provide a second polishing wheel PW2 in the direction of FP; move the second polishing wheel PW2 toward the folded portion FP so that the second polishing wheel PW2 contacts the folded portion FP; and rotate the second polishing wheel PW2 to polish one surface of the folded portion FP.

[0176] refer to Figures 13 to 15 The description of the movement of the first polishing wheel PW1 can be applied in the same way to the movement of the second polishing wheel PW2, and therefore, the description of the movement of the second polishing wheel PW2 will not be repeated.

[0177] Then, the chemical strengthening process S600 (reference) can be performed. Figure 5 Although not shown in the accompanying drawings, the chemically enhanced process S600 (reference) Figure 5 This can include replacing the ions included in the window glass WG with other ions. For example, when the window glass WG containing the glass is immersed in a high-temperature molten alkali salt, the sodium ions (Na+) on the surface of the window glass WG... + Some of these can be absorbed by potassium ions (K+). + Substitution. Due to potassium ions (K) + ) greater than sodium ions (Na) + Furthermore, a compressive stress layer is formed during cooling, thus increasing the strength of the window glass WG.

[0178] In the following text, reference will be made to Figures 17 to 19 The properties of window glass WG manufactured by the method of manufacturing window glass according to this disclosure are described.

[0179] Figure 17 This is a perspective view of a window glass WG according to an embodiment of the present disclosure. Figure 17 A window glass WG in a bent state is shown. The window glass WG manufactured by the method of manufacturing window glass according to this disclosure undergoes a thermoforming process S400 (see reference). Figure 5 Therefore, the window glass WG can have a bent shape as its basic shape. That is, the window glass WG can maintain a bent state without the application of external force; however, this disclosure should not be limited to this or thereby restricted. According to an embodiment, the window glass WG can have a bent shape as its basic shape, but when in a bent state, the window glass WG can have reduced internal stress.

[0180] In the bent state, the planes of the mutually facing portions of the second surfaces S2, including the non-folded portion NFP, can form a predetermined angle. In this disclosure, this angle may be referred to as the angle of the non-folded portion in the bent state. In this embodiment, the mutually facing portions of the second surfaces S2 of the non-folded portion NFP can be substantially parallel to each other; however, this disclosure should not be limited to or construed as such. As another example, the angle of the non-folded portion in the bent state can be equal to or less than approximately 90 degrees.

[0181] Figure 18 This is a perspective view of a window glass WG according to an embodiment of the present disclosure. Figure 19 It is along Figure 18 The cross-sectional view taken from line III-III'. Figure 18 The window glass WG is shown in its unfolded state.

[0182] refer to Figure 18 and Figure 19 A window glass WG manufactured by a window glass manufacturing method may include a folded portion FP and non-folded portions NFP1 and NFP2, wherein the non-folded portions NFP1 and NFP2 are spaced apart from each other and the folded portion FP is located between the non-folded portions NFP1 and NFP2.

[0183] When performing polishing process S500 (reference) Figure 5 After that, the folded portion FP can have a thickness smaller than the window glass WH (reference). Figure 9 The thickness FT of the folded portion FP can be less than the thickness NT of the non-folded portions NFP1 and NFP2. For example, the thickness NT of the non-folded portion can be equal to or greater than approximately 0.05 mm and equal to or less than approximately 0.6 mm. The thickness FT of the folded portion FP can be equal to or greater than approximately 0.03 mm and equal to or less than approximately 0.1 mm.

[0184] The groove GR can be defined in the folding portion FP of the window glass WG. The groove GR can be formed in the groove (S520, reference). Figure 6 The groove GR is formed during the process of forming the groove. In this embodiment, the groove GR can be formed by recessing a portion of the first surface S1 of the window glass WG in the thickness direction DR3; however, this disclosure should not be limited to or restricted by this. According to an embodiment, the groove GR can be formed in the window glass by recessing a portion of the second surface S2 in the thickness direction DR3 or by recessing a portion of both the first surface S1 and the second surface S2.

[0185] In this embodiment, the groove GR may be defined by a flat portion HP and an inclined portion SP, the inclined portions SP being spaced apart from each other and the flat portion HP being between the inclined portions SP and inclined from the boundary between the groove GR and the non-folded portion NFP toward the flat portion HP.

[0186] In this embodiment, when viewed in cross-section, one end SE1 and the other end SE2 of each of the inclined portions SP can have a predetermined curvature.

[0187] Figure 19 The structure shown is such that one end SE1 (also referred to as boundary portion SE1) of the inclined portion SP, corresponding to the boundary between the groove GR and the non-folded portions NFP1 and NFP2, has a predetermined curvature, and the other end SE2 (also referred to as boundary portion SE2) of the inclined portion SP, corresponding to the boundary between the flat portion HP and the inclined portion SP, has a predetermined curvature.

[0188] According to the manufacturing method of window glass, due to the use of a multi-axis polishing machine (AE) (see reference) Figure 11 The window glass WG is polished so that the boundary portions SE1 and SE2, as well as the portions surrounding the boundary portions SE1 and SE2, can be formed into gently curved surfaces. That is, the boundary between the groove GR and the non-folded portions NFP1 and NFP2, and the boundary between the flat portion HP and the inclined portion SP, can be formed into gently curved surfaces.

[0189] According to this embodiment, since the portion adjacent to the folding portion FP is formed more gently, the stress applied between the folding portion FP and the inclined portion SP during the folding operation can be reduced. Therefore, the folding characteristics of the window glass can be improved.

[0190] According to this embodiment, a method can be provided for manufacturing window glass WG as ultra-thin glass (UTG) that has reduced bending stress in a bent state.

[0191] Figure 20 This is a view illustrating the process of manufacturing window glass WG-1 according to an embodiment of the present disclosure.

[0192] Figure 20 The manufacturing process of the window glass shown can correspond to the folded portion FP in the bent state (reference). Figure 19 One surface is polished (S500, reference) Figure 5 ).exist Figure 20 In the figures, the same / similar reference numerals indicate Figures 5 to 19 The same / similar elements in the text will be omitted, and therefore, detailed descriptions of the same / similar elements will be omitted.

[0193] refer to Figure 20 In the bent window glass WG-1, the second surface S2 is set to face the third direction DR3 toward its orientation. That is, with reference... Figures 13 to 15Unlike the aforementioned window glass WG, the second surface S2 can face the first polishing wheel PW1. Therefore, the initial groove P-GR2 can be formed by polishing the second surface S2 in the thickness direction DR3 of the window glass WG-1.

[0194] According to the method for manufacturing window glass disclosed herein, the shape and installation configuration of the window glass to be manufactured can be adjusted during the thermoforming stage or the window glass processing stage, and therefore, the shape of the groove formed in the folding portion can be easily controlled.

[0195] Figure 21 and Figure 22 This is a view illustrating the process of manufacturing window glass WG-2 according to an embodiment of the present disclosure.

[0196] exist Figure 21 and Figure 22 In the figures, the same / similar reference numerals indicate Figures 5 to 19 The same / similar elements in the text will be omitted, and therefore, detailed descriptions of the same / similar elements will be omitted.

[0197] A method for manufacturing window glass may include: providing a window base glass (S100, reference) Figure 5 Cutting window pre-glass (S200, reference) Figure 5 ); Provide window glass (S300, reference) Figure 5 Heated window glass and thermoforming process S400 (reference) Figure 5 Polish one surface of the folded portion in the bent state (S500, reference). Figure 5 ); and tempered window glass (S600, see reference) Figure 5 ).

[0198] This can be achieved by providing the window pane (S100, reference) Figure 5 ), cut window pre-glass (S200, reference) Figure 5 ), provide window glass (S300, reference) Figure 5 ) and heated window glass and thermoforming process S400 (reference) Figure 5 WG-2 window glass is manufactured using this process. In other words, WG-2 window glass in a bent state can be obtained by performing a heating and thermoforming process S400 on the window glass.

[0199] In this embodiment, multiple window glass WG-2s can be provided. When multiple window glass WG-2s are provided, they can be stacked to perform polishing processes simultaneously, thereby improving process efficiency. Figure 21 Three WG-2 window panes are shown as representative examples; however, this disclosure should not be limited thereto or thereby restricted. As another example, the WG-2 window panes may be provided as a single unit.

[0200] The manufacturing method of the window glass may further include, after the heating and thermoforming process S400 of the window glass, the alternating stacking of window glass WG-2 bent by the thermoforming process with a second impact absorbing member CM2 between them.

[0201] Shock-absorbing components CM1 and CM2 can be provided between the surfaces of stacked window glass WG-2.

[0202] Shock-absorbing components CM1 and CM2 prevent impacts between window glass panes WG-2 and prevent scratches on the surface of the window glass WG-2. Shock-absorbing components CM1 and CM2 can be made of sponge, liner paper for glass, etc.

[0203] The first impact-absorbing member CM1 can be disposed between the facing surfaces of each of the stacked window glass WG-2 in a bent state, and the second impact-absorbing member CM2 can be disposed between the facing surfaces of the different stacked window glass WG-2. Figure 21 A representative example is shown of a structure in which a first impact-absorbing member CM1 is disposed between first surfaces S1 and a second impact-absorbing member CM2 is disposed between second surfaces S2 facing each other and respectively included in different window glass WG-2.

[0204] In this embodiment, the manufacturing method of window glass WG-2 can be performed using a side polishing machine. That is, compared with the reference... Figures 7 to 19 The manufacturing method of the described WG-2 window glass is different, and the polishing process can be performed using a side polishing machine instead of a multi-axis polishing machine.

[0205] refer to Figure 21 A polishing machine PA can be provided. The polishing machine PA may include a first side polishing wheel SW1 and a second side polishing wheel SW2.

[0206] The first side polishing wheel SW1 and the second side polishing wheel SW2 can be polishing wheels. Each of the side polishing wheels SW1 and SW2 can rotate. The first side polishing wheel SW1 can rotate about a first side rotation axis SX1, and the second side polishing wheel SW2 can rotate about a second side rotation axis SX2. In this embodiment, the first side rotation axis SX1 and the second side rotation axis SX2 can be substantially parallel to the third direction DR3.

[0207] The first polishing wheel SW1 can be adjacent to the edge WE of the window glass WG-2, and the second polishing wheel SW2 can be adjacent to the folded portion FP of the window glass WG-2. That is, compared with the reference... Figures 12 to 15The process described is different. Since the polishing wheel is also provided near the edge WE of the window glass WG-2, not only the folded part FP of the window glass WG-2 but also the edge WE can be polished almost simultaneously.

[0208] When viewed from a third-party perspective (DR3), the rotation direction of the first-side polishing wheel SW1 can be opposite to the rotation direction of the second-side polishing wheel SW2. (Reference) Figure 21 When viewed from a third-party perspective DR3, the first-side polishing wheel SW1 can rotate clockwise, and the second-side polishing wheel SW2 can rotate counterclockwise; however, this disclosure should not be limited thereto or thereby restricted. According to an embodiment, the first-side polishing wheel SW1 can rotate counterclockwise, and the second-side polishing wheel SW2 can rotate clockwise.

[0209] refer to Figure 22 The stacked window glass WG-2 and the impact-absorbing components CM1 and CM2 can move along the first direction DR1.

[0210] The WG-2 window glass can simultaneously contact the first side polishing wheel SW1 and the second side polishing wheel SW2. Stacked WG-2 window glass panes can move between the first side polishing wheel SW1 and the second side polishing wheel SW2. For example... Figure 22 As shown, the first side polishing wheel SW1 can rotate in a clockwise direction, the second side polishing wheel SW2 can rotate in a counterclockwise direction, and the stacked window glass WG-2 can move in the first direction DR1.

[0211] The side polishing process may include rotating a first side polishing wheel SW1 to polish the edge WE of the window glass WG-2 and rotating a second side polishing wheel to polish the folded portion FP of the window glass WG-2.

[0212] In this embodiment, the edge WE and the folded portion FP of the window glass WG-2 can be polished. Polishing of the edge WE and the folded portion FP can be performed substantially simultaneously. Therefore, the surface quality of the edge WE of the window glass WG-2 can be improved, and the flat portion HP1 of the folded portion FP can be formed simultaneously. In this process, the edge WE and the folded portion FP can be referred to as the "side surface" of the window glass WG-2.

[0213] According to the window glass manufacturing method of this embodiment, only the flat portion HP1 can be formed in the folded portion FP, and the inclined portion SP can be omitted (see reference). Figure 19 However, because each bend in the WG-2 window glass is such that the two surfaces facing each other are substantially parallel, when the window is unfolded after polishing the folded portion FP of the WG-2 window glass, grooves with the same curvature can be formed (see reference). Figure 19 (The groove GR). Therefore, the flat portion HP1 can have a gently curved surface. This reduces the internal stress that occurs when the window glass WG-2 is folded or unfolded.

[0214] Because the manufacturing process of window glass involves bending and thermoforming the WG-2 window glass before polishing the folded portion FP and the edge WE, the window glass panes can be etched essentially simultaneously after being stacked together. Therefore, the manufacturing process of window glass can be simplified, and manufacturing costs can be reduced.

[0215] Furthermore, according to the manufacturing method of the window glass, not only the folded part FP of the window glass WG-2 but also the edge WE of the window glass WG-2 can be processed at the same time, and thus the surface quality of the edge WE can be improved.

[0216] Although embodiments of this disclosure have been described, it should be understood that this disclosure is not intended to be limited to these embodiments, but rather that various changes and modifications can be made by those skilled in the art within the spirit and scope of the claimed disclosure. Therefore, the subject matter disclosed should not be limited to any single embodiment described herein, and the scope of the invention should be determined by the appended claims.

Claims

1. A method for manufacturing window glass, wherein, The method includes: A window glass is provided, the window glass including a folding portion and a plurality of non-folding portions, the plurality of non-folding portions being spaced apart from each other and the folding portion being located between the plurality of non-folding portions; Heating the window glass to keep the folded portion in a bent state; and One surface of the folded portion in the bent state is polished.

2. The method according to claim 1, wherein, The window glass comprises glass material, and when the window glass is heated, the folded portion is heated at a temperature equal to or greater than 500°C and equal to or less than 750°C.

3. The method according to claim 1, wherein, When heating the window glass, the window glass is heated for a time equal to or longer than 10 seconds and equal to or shorter than 120 seconds.

4. The method according to claim 1, wherein, Polishing one surface of the folded portion includes: Multi-axis polishing machines are available; and The multi-axis polishing machine is used to form grooves in the folded portion.

5. The method according to claim 4, wherein, The multi-axis polishing machine includes: A clamping unit includes a first plate and a clamping component. The first plate is movable in a first direction and a second direction, which intersect each other in a plan view. The clamping component is disposed on the first plate and is rotatable. The polishing unit includes a second plate, a first polishing wheel, and a second polishing wheel. The second plate is spaced apart from the first plate in a third direction intersecting the first and second directions. The second plate includes a first surface facing the first plate and a second surface facing away from the first surface. The first polishing wheel is disposed on the first surface and is rotatable, and the second polishing wheel is disposed on the second surface and is rotatable. The formation of the groove includes: Secure the window glass to the clamp component; The first polishing wheel is moved in a direction toward the folded portion so that the first polishing wheel contacts the folded portion; and The first polishing wheel is rotated to polish one surface of the folded portion.

6. The method according to claim 5, wherein, The formation of the groove also includes: The second polishing wheel is provided in the direction toward the folded portion; The second polishing wheel is moved in the direction toward the folded portion so that the second polishing wheel contacts the folded portion; and The second polishing wheel is rotated to polish one of the surfaces of the folded portion.

7. The method according to claim 6, wherein, Each of the first polishing wheel and the second polishing wheel includes a polishing brush or a polishing pad.

8. The method according to claim 4, wherein, The folded portion includes a flat portion formed by the groove and a plurality of inclined portions, the plurality of inclined portions being spaced apart from each other and the flat portion being located between the plurality of inclined portions, and the plurality of inclined portions being inclined from the plurality of non-folded portions toward the flat portion.

9. The method according to claim 8, wherein, Each of the plurality of inclined portions has a first end and a second end having a predetermined curvature in a cross-sectional view, the first end being adjacent to a corresponding non-folded portion of the plurality of non-folded portions, and the second end being adjacent to the flat portion.

10. The method according to claim 1, wherein, The folded portion extends from a first surface of the plurality of non-folded portions that faces each other in the bent state, or from a second surface of the plurality of non-folded portions that faces away from the first surface.

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