elastic member

Abstract

The elastic member according to the embodiment includes: a first surface and a second surface opposite to the first surface; and a first region and a second region, wherein a first direction in a length direction and a second direction in a width direction are defined, the first region is defined as a folded region, the second region is defined as an unfolded region, a first pattern portion having a concave printing shape and a second pattern portion having a convex printing shape are formed in the first region, the second pattern portion includes a plurality of first patterns spaced apart from each other and a plurality of second patterns spaced apart from each other, and a length of the first pattern extends in the second direction, and a length of the second pattern extends in the first direction.

Description

Technical Field

[0001] The embodiment relates to an elastic member. Background Technology

[0002] Recently, there has been a growing demand for flexible or foldable display devices that can be easily carried for various applications and display images on a large screen while on the go.

[0003] Such flexible or foldable display devices are folded or partially bent when carried or stored, and can be displayed as an unfolded display when showing images. Accordingly, the image display area can be increased, and the user can easily carry the display.

[0004] After a flexible or foldable display device is folded or bent, the process of unfolding the flexible display device again can be repeated to restore its original shape.

[0005] In other words, because flexible or foldable display devices involve repeated folding and unfolding operations, the substrate of a flexible display device needs constant strength and elasticity, and the substrate should not crack or deform during the folding and unfolding process.

[0006] On the other hand, the display substrate, which serves as the elastic component of a flexible or foldable display device, is generally made of metal.

[0007] Accordingly, the display substrate, including metal components, may be subjected to compressive and tensile stresses in the folding area during repeated folding and unfolding, and correspondingly, cracks may appear in the folding area when the elastic member is folded or unfolded. Folding reliability may be reduced.

[0008] Furthermore, when an elastic member is folded or unfolded, the stress generated is concentrated in a specific area, creating a hot spot area, and plastic deformation or cracks may occur in the elastic member in this area.

[0009] Therefore, there is a need for an elastic member with a new structure that can reduce the stress on the folding elastic member and prevent stress concentration in specific areas during folding and original restoration. Summary of the Invention

[0010] Technical issues

[0011] The embodiments are intended to provide an elastic member that can prevent cracking and deterioration of folding properties due to stress generated during folding and recovery.

[0012] Technical solution

[0013] According to an embodiment, the elastic member includes a first surface, a second surface opposite to the first surface, a first region, and a second region, wherein a first direction in the length direction and a second direction in the width direction are defined, the first region is defined as a folding region, the second region is defined as an unfolding region, a first pattern portion having an intaglio shape and a second pattern portion having an embossed shape are formed in the first region, the second pattern portion includes a plurality of first and second patterns and a plurality of second patterns, the plurality of first patterns being spaced apart from each other, the plurality of second patterns being spaced apart from each other, the length of the first pattern extending in the second direction, and the length of the second pattern extending in the first direction.

[0014] Beneficial effects

[0015] The elastic member according to the embodiment can improve the support and folding properties of the elastic member.

[0016] In detail, since the first patterned portion is formed by partially etching the elastic member without penetrating it, the folding of the elastic member can be promoted, and the deterioration of the support characteristics can be minimized due to the formation of the patterned portion.

[0017] Furthermore, by providing a second pattern portion that can distribute stress within the first pattern portion in a direction parallel to the folding axis, it is possible to prevent stress moving through the first pattern portion from concentrating in a specific area of ​​the elastic member.

[0018] Therefore, it can prevent cracks or warping of elastic members caused by stress concentration in specific areas of the elastic member.

[0019] Furthermore, in the elastic member according to the embodiment, the elastic member is formed of multiple layers, which correspondingly improves both the tensile properties and elastic properties of the elastic member.

[0020] That is, a first layer with good tensile properties is formed as a support layer for the elastic member, and a second layer with a small elastic modulus is disposed on the first layer as a reinforcing layer. Therefore, the tensile strength and support force of the elastic member are fully provided by the first layer, and sufficient elastic force can be ensured by promoting the deformation of the elastic member through the second layer.

[0021] Therefore, the elastic member according to the embodiment can ensure elastic force together with the tensile properties of the elastic member, thereby having improved folding characteristics.

[0022] Furthermore, in the elastic member according to the embodiment, the elastic member is formed of multiple layers, and accordingly, the depth of the patterned portion of the elastic member and the thickness of the remaining elastic member can be easily controlled. That is, the elastic member is composed of multiple layers that react with different etchants, so the depth of the patterned portion and the thickness of the remaining elastic member can be easily controlled. Attached Figure Description

[0023] Figure 1 This is a perspective view of a flexible display device according to an embodiment;

[0024] Figure 2 This is a perspective view of the elastic member according to an embodiment;

[0025] Figure 3 This is a side view of the elastic member before folding according to the embodiment;

[0026] Figure 4 This is a side view of the elastic member after folding, according to an embodiment;

[0027] Figure 5 This is a top view of the first surface of the elastic member according to the first embodiment;

[0028] Figure 6 This is a top view of the second surface of the elastic member according to the first embodiment;

[0029] Figure 7 It is along Figure 5 A sectional view taken by line A-A' in the middle;

[0030] Figure 8 It is along Figure 5 Another sectional view taken by line A-A' in the middle;

[0031] Figure 9 It is along Figure 5 A sectional view taken by line B-B' in the middle;

[0032] Figure 10 It is along Figure 5 A sectional view taken by line C-C' in the middle;

[0033] Figure 11 and Figure 12 This is a view used to describe the stress distribution of the elastic member according to the first embodiment;

[0034] Figure 13 This is another top view of the first surface of the elastic member according to the first embodiment;

[0035] Figure 14 This is another top view of the first surface of the elastic member according to the first embodiment;

[0036] Figure 15 This is yet another top view of the first surface of the elastic member according to the first embodiment;

[0037] Figure 16 This is a top view of the first surface of the elastic member according to the second embodiment;

[0038] Figure 17 This is a top view of the second surface of the elastic member according to the second embodiment;

[0039] Figure 18 It is along Figure 16 A sectional view taken by line D-D' in the middle;

[0040] Figure 19 It is along Figure 16 Another sectional view taken by line D-D' in the middle;

[0041] Figure 20 It is along Figure 16 A sectional view taken by line E-E' in the middle;

[0042] Figure 21 It is along Figure 16 A sectional view taken by line F-F' in the middle;

[0043] Figure 22 This is another top view of the first surface of the elastic member according to the second embodiment;

[0044] Figure 23 This is another top view of the first surface of the elastic member according to the second embodiment;

[0045] Figure 24 This is yet another top view of the first surface of the elastic member according to the second embodiment;

[0046] Figure 25 This is a view used to describe an application example of the elastic member according to the embodiment. Detailed Implementation

[0047] Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings. However, the concept and scope of the invention are not limited to the described embodiments, but can be implemented in different forms, and one or more components in the embodiments can be selectively combined and substituted within the concept and scope of the invention. Furthermore, unless otherwise explicitly defined and described, the terms (including technical and scientific terms) used in the embodiments of this disclosure are to be interpreted as having the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and terms such as those defined in common dictionaries are to be interpreted as having a meaning consistent with their meaning in the context of the relevant art.

[0048] Furthermore, the terminology used in the embodiments of this disclosure is for describing embodiments and is not intended to limit the invention. In this specification, unless specifically stated in the wording, the singular form may also include the plural form, and when described as "at least one (or more) of A, B, and C", it may include at least one of all combinations that can be combined among A, B, and C.

[0049] Furthermore, when describing elements of embodiments of this disclosure, terms such as first, second, A, B, (a), and (b) may be used. These terms are used only to distinguish elements from other elements, and they do not limit the nature, order, or sequence of the elements.

[0050] In addition, when an element is described as being “connected” or “coupled” to another element, it can include not only cases where the element is directly “connected” or “combined” to other elements, but also cases where the element is “connected” or “combined” to another element through which the element is connected or “combined” with other elements.

[0051] Furthermore, when described as being formed or set “above” or “below” each element, “above” or “below” can include not only cases where two elements are directly connected to each other, but also cases where one or more other elements are formed or set between two elements.

[0052] Furthermore, when expressed as "up" or "down", it can include not only the upward direction based on a single element, but also the downward direction based on a single element.

[0053] In the following description, the elastic member according to an embodiment will be described with reference to the accompanying drawings.

[0054] Figure 1 This is a perspective view of a display device including an elastic member according to an embodiment. The display device according to the embodiment may be a flexible display device or a foldable display device that can be bent in one direction.

[0055] refer to Figure 1 The display device 1000 according to the embodiment may include an elastic member 100, a display panel 200 disposed on the elastic member 100, and a touch panel 300 disposed on the display panel 200.

[0056] The elastic member 100 can support the display panel 200 and the touch panel 300. That is, the elastic member 100 can be a support substrate that supports the display panel 200 and the touch panel 300.

[0057] The elastic member 100 may include metallic materials. For example, the elastic member 100 may include metals, metal alloys, plastics, composite materials (e.g., carbon fiber reinforced plastics, magnetic or conductive materials, glass fiber reinforced materials, etc.), ceramics, sapphire, glass, etc. The elastic member 100 may be formed as a single layer or as a multilayer comprising multiple layers.

[0058] The elastic member 100 can be flexible or foldable. That is, the elastic member 100 can be folded or bent in one direction. In other words, the elastic member 100 can be a substrate for a display used in a flexible display device or a foldable display device.

[0059] The elastic member 100 may include at least two regions. Specifically, the elastic member 100 may include a first region 1A and a second region 2A.

[0060] The first region 1A can be defined as the region where the elastic member 100 is folded. That is, the first region 1A can be a folded region.

[0061] Furthermore, the second region 2A can be defined as the region where the elastic member 100 is not folded. That is, the second region 2A can be an unfolded region.

[0062] Region 1A and Region 2A will be described in detail below.

[0063] The display panel 200 can be mounted on the elastic member 100.

[0064] The display panel 200 may include a plurality of pixels, which include switching thin-film transistors, driving thin-film transistors, power storage devices, and organic light-emitting diodes (OLEDs). OLEDs can be deposited at relatively low temperatures and, due to their low power consumption and high brightness, are primarily used in flexible display devices. Here, a pixel refers to the smallest unit used to display an image, and the display panel displays images through a plurality of pixels.

[0065] A display panel may include a substrate, gate lines disposed on the substrate, data lines isolated from the gate lines, and a common power line. Generally, a pixel can be defined by gate lines, data lines, and a common power line serving as a boundary.

[0066] The substrate may include a material with flexible properties, such as a plastic film, and the display panel 200 may be realized by disposing organic light-emitting diodes and pixel circuits on the flexible film.

[0067] The touch panel 300 can be positioned above the display panel 200. The touch panel 300 can implement touch functionality in a foldable display device or a flexible display device, and the touch panel can be omitted in a foldable display device or a flexible display device that only displays images and does not have touch functionality.

[0068] The touch panel 300 may include a substrate and touch electrodes disposed on the substrate. The touch electrodes may sense the position of an input device touched by a foldable or flexible display device via capacitive or resistive means.

[0069] The substrate of the touch panel 300 may include a material with flexible properties, such as a plastic film, and the touch panel 300 may be realized by placing touch electrodes on the elastic film.

[0070] Meanwhile, the elastic member 100 and the display panel 200 can have different sizes.

[0071] For example, the area of ​​the elastic member 100 may be 90% or more to 110% or less of the area of ​​the display panel 200. More specifically, the area of ​​the elastic member 100 may be 95% or more to 105% or less of the area of ​​the display panel 200. More specifically, the area of ​​the elastic member 100 may be 97% or more to 100% or less of the area of ​​the display panel 200.

[0072] When the area of ​​the elastic member 100 is 90% or less of the area of ​​the display panel 200, the supporting force of the elastic member 100 on the display panel 200 or touch panel 300 deteriorates, and therefore curling may occur in the unfolded area of ​​the elastic member 100. Accordingly, when the user visually identifies the screen area, visibility may deteriorate, and when a touch is activated, the screen in the touch area may be incomplete due to the curled area, and touch malfunction may occur.

[0073] Furthermore, when the area of ​​the elastic member 100 increases to 110% or more of the area of ​​the display panel 200, the supporting force for supporting the display panel or touch panel can be ensured by the elastic member 100, but the bezel area of ​​the display device, including the substrate, display panel, and touch panel, may increase. Consequently, a wide effective screen area cannot be provided to the user, which may cause inconvenience in using the display device.

[0074] Meanwhile, although not shown in the accompanying drawings, a cover window protecting the foldable or flexible display device may be additionally provided above the touch panel 300 or the display panel 200 (when the touch panel is omitted).

[0075] Meanwhile, the elastic member 100, the display panel 200, and the touch panel 300 can be bonded to each other using an adhesive layer or the like. In this case, when the elastic member 100 and the display panel 200 are bonded to each other, the adhesive layer is not provided in the first region of the elastic member 100, i.e., the folded region, but only in the second region, i.e., the unfolded region, for bonding. Alternatively, the adhesive layer can be provided in both the first and second regions.

[0076] As described above, the display device includes an elastic member 100.

[0077] refer to Figure 2 The elastic member 100 can bend in one direction.

[0078] In detail, the elastic member 100 may include a first surface 1S and a second surface 2S opposite to the first surface 1S. In the elastic member 100, either the first surface 1S or the second surface 2S can be bent to face each other. That is, the elastic member 100 can be bent so that the surfaces on which the panel is disposed face each other. Alternatively, the elastic member 100 can be bent so that the surfaces opposite to the surfaces on which the panel is disposed face each other.

[0079] In the following description, such as Figure 2 As shown, the main description will focus on the bending of the elastic member 100 in the direction in which the second surfaces 2S face each other.

[0080] As described above, the elastic member 100 may have a first region 1A and a second region 2A defined therein. The first region 1A and the second region 2A may be regions defined when the elastic member 100 bends in a direction in which the second surface 2S faces each other.

[0081] In detail, the elastic member 100 bends in one direction, and the elastic member 100 can be divided into a first folded region 1A (folded region) and an unfolded second region 2A (unfolded region).

[0082] refer to Figure 3 and Figure 4 The elastic member 100 may include a first region 1A, which is the region where the elastic member 100 is bent. Furthermore, the elastic member 100 may include a second region 2A, which is not bent and is positioned adjacent to the first region 1A.

[0083] For example, the second region 2A can be formed on the left and right sides of the first region 1A based on the bending direction of the elastic member 100. That is, the second region 2A can be located at both ends of the first region 1A. In other words, the first region 1A can be located between the second regions 2A.

[0084] The first region 1A and the second region 2A can be formed on the same elastic member 100. That is, the first region 1A and the second region 2A can be formed integrally with each other without being separated from the same elastic member 100.

[0085] The dimensions of the first region 1A and the second region 2A can be different from each other. Specifically, the dimensions of the second region 2A can be larger than the dimensions of the first region 1A.

[0086] Furthermore, the area of ​​the first region 1A of the elastic member 100 may be 1% or more to 30% or less of the total area of ​​the elastic member 100. More specifically, the area of ​​the first region 1A of the elastic member 100 may be 5% or more to 20% or less of the total area of ​​the elastic member 100. Alternatively, the area of ​​the first region 1A of the elastic member 100 may be 10% or more to 15% or less of the total area of ​​the elastic member 100.

[0087] When the area of ​​the first region 1A of the elastic member 100 is 1% or less of the total area of ​​the elastic member 100, cracks may occur at the interface between the folding and unfolding areas of the elastic member 100 when the substrate is repeatedly folded and unfolded, and thus the folding reliability of the elastic member 1000 may deteriorate.

[0088] Furthermore, when the area of ​​the first region 1A of the elastic member 100 exceeds 30% of the total area of ​​the elastic member 100, curling may occur in the folded area of ​​the display panel 200 when the substrate is folded. Accordingly, visibility may deteriorate when the user visually identifies the screen area, and when a touch is activated, the screen in the touch area may be incomplete due to the curled area, thus potentially causing touch malfunction.

[0089] The accompanying drawings show a first region 1A located in the central portion of the elastic member 100, but this embodiment is not limited to this. That is, the first region 1A can be located in one end and the other end of the elastic member 100, resulting in an asymmetrical size of the first region 1A.

[0090] Figure 4 This is a side view of the elastic member after it has been folded.

[0091] refer to Figure 4 The elastic member 100 can be folded in one direction around the folding axis. Specifically, the second surfaces 2S can be folded in a direction facing each other.

[0092] As the elastic member 100 is folded in one direction, a first region 1A and a second region 2A can be formed on the elastic member 100. That is, the folded region formed when the elastic member 100 is folded in one direction and the unfolded regions located at both ends of the folded region can be formed on the elastic member 100.

[0093] A folded region can be defined as a region that forms curvature R, while an unfolded region can be defined as a region that does not form curvature R or has curvature close to zero.

[0094] refer to Figure 3 and Figure 4 The elastic member 100 can be folded in one direction to form an unfolded area, a folded area, and an unfolded area in sequence.

[0095] Multiple patterned portions may be formed in at least one of the first region 1A and the second region 2A to reduce and distribute the stress generated when the elastic member 100 is folded. The patterned portions will be described in detail below.

[0096] at the same time, Figure 4 The second surface 2S of the elastic member 100 is shown to be folded so that they face each other, but this embodiment is not limited to this; the first surface 1S can also be folded so that they face each other.

[0097] In detail, the folded surface of the elastic member can vary depending on the formation position of the pattern portion formed on the elastic member 100, which will be described below.

[0098] In other words, the elastic member 100 can be folded so that the surfaces of the unpatterned portions of the elastic member 100 face each other.

[0099] The elastic member according to various embodiments will now be described in detail with reference to the accompanying drawings.

[0100] First, refer to Figures 5 to 15 The elastic member according to the first embodiment is described.

[0101] Figure 5 and Figure 6 This is a top view of the first and second surfaces of the elastic member according to the first embodiment. That is, Figure 5 This is a top view of the first surface 1S of the elastic member when the elastic member 100 is folded; the first surface 1S is the folded outer surface. Figure 6 This is a top view of the second surface 2S of the elastic member when the elastic member 100 is folded, and the second surface 2S is the inner surface of the fold.

[0102] refer to Figure 5 and Figure 6The elastic member 100 may include a plurality of patterned portions. Specifically, the plurality of patterned portions may be disposed in a first region 1A of the elastic member 100. That is, the plurality of patterned portions may be disposed in a first region 1A defined as a folded region of the elastic member 100.

[0103] The pattern portion 400 may be disposed on at least one of the first surface 1S and the second surface 2S of the elastic member 100. In detail, when the elastic member 100 is folded, the pattern portion 400 may be disposed on the first surface 1S, which is the folded outer surface of the elastic member 100.

[0104] The pattern portion 400 may include a plurality of pattern portions with different shapes. More specifically, the pattern portion 400 may include a first pattern portion 410 and a second pattern portion 420 with different shapes.

[0105] refer to Figures 7 to 9 The first patterned portion 410 can be formed by etching the elastic member 100. Specifically, the first patterned portion 410 can be formed by partially etching the elastic member 100 from the first surface 1S toward the second surface 2S. That is, the first patterned portion 410 can be formed as a recessed pattern. In other words, the first patterned portion 410 can be a groove formed on the first surface 1S of the elastic member 100.

[0106] The accompanying drawings show that the first pattern portion 410 has a constant width in the depth direction. However, this embodiment is not limited to this. Depending on the etching method and time, the inner surface of the first pattern portion 410 may have a certain tilt angle, so that the first pattern portion 410 is formed to become wider or narrower as it extends in the depth direction.

[0107] Furthermore, the accompanying drawings show that the inner surface IS of the first patterned portion 410 is a flat surface, but this embodiment is not limited to this. The inner surface of the first patterned portion 410 may include a curved surface, or it may have surface roughness through multiple concave and convex patterns, etc.

[0108] Accordingly, the first patterned portion 410 may include one or more side surfaces and a bottom surface BS connected to the side surfaces.

[0109] The bottom surface BS of the first pattern section 410 can have various shapes.

[0110] refer to Figure 7 The bottom surface BS of the first patterned portion 410 can be formed as a flat surface. Alternatively, refer to... Figure 8The bottom surface BS of the first patterned portion 410 may include a convex surface in the depth direction of the first patterned portion 410. That is, the bottom surface BS of the first patterned portion 410 may include a convex surface facing the second surface 2S of the elastic member.

[0111] In detail, the bottom surface BS of the first patterned portion 410 can be formed to have a radius of curvature of 0.1 mm or greater. When the radius of curvature of the bottom surface BS of the first patterned portion 410 is less than 0.1 mm, when the elastic member is folded, stress is concentrated in a specific first patterned portion due to the thickness deviation caused by the size of the radius of curvature, and thus the folding characteristics may deteriorate.

[0112] The depth d of the first patterned portion 410 can vary depending on the thickness of the elastic member 100. Furthermore, the depth d of the first patterned portion 410 can vary depending on the degree to which the elastic member 100 is folded, i.e., the radius of curvature of the folded elastic member 100. Here, the depth d of the first patterned portion 410 can be defined as the maximum distance from the bottom surface BS of the first patterned portion 410 to the first surface 1S of the elastic member 100.

[0113] Furthermore, the thickness t of the first patterned portion 410 can vary depending on the degree to which the elastic member 100 is folded (i.e., the radius of curvature of the elastic member 100 after folding). The thickness t of the first patterned portion 410 can vary depending on the depth of the first patterned portion 410. The thickness t of the first patterned portion 410 can be defined as the thickness of the elastic member 100 remaining after the first patterned portion 410 is formed on the first surface 1S of the elastic member. That is, the thickness t of the first patterned portion 410 can be defined as the distance from the bottom surface BS of the first patterned portion 410 to the second surface 2S of the elastic member 100. In detail, the thickness t of the first patterned portion 410 can be defined as the maximum distance from the bottom surface BS of the first patterned portion 410 to the second surface 2S of the elastic member 100.

[0114] In detail, when the elastic member 100 is folded such that the radius of curvature of the elastic member 100 is 5 mm or less, the thickness t of the first patterned portion 410 can be 50 μm or less.

[0115] In detail, when the elastic member 100 is folded such that the radius of curvature is greater than 0.5 mm and less than 5 mm, the thickness t of the first patterned portion 410 can be 50 μm or less.

[0116] More specifically, when the elastic member 100 is folded such that the radius of curvature is greater than 0.5 mm and less than 5 mm, the thickness t of the first patterned portion 410 can be from 5 μm to 50 μm.

[0117] When the thickness t of the first pattern portion 410 is formed such that the radius of curvature of the elastic member 100 is less than 5μm, the elastic force of the elastic member is reduced due to the reduction in the thickness of the first pattern portion 410. Therefore, the restoring force after folding can be reduced, and the supporting force for supporting the display panel provided on the elastic member 100 can be reduced.

[0118] Furthermore, when the thickness t of the first patterned portion 410 is formed such that the radius of curvature of the elastic member 100 is greater than 50 μm, plastic deformation occurs in the first region 1A, which is the folding region, due to the increased thickness of the first patterned portion 410 after folding, and thus the folding characteristics may deteriorate.

[0119] The elastic member 100 may include multiple directions. Specifically, the elastic member 100 may include a first direction 1D, a second direction 2D, and a third direction.

[0120] In detail, the elastic member 100 may extend in a first direction 1D corresponding to the length or width direction of the elastic member 100 and in a direction different from the first direction 1D, may extend in a second direction 2D corresponding to the length or width direction of the elastic member 100 and in a direction different from the first direction 1D and the second direction 2D, and may include a third direction corresponding to the thickness direction of the elastic member 100.

[0121] For example, the first direction 1D can be defined as the length direction of the elastic member 100, the second direction 2D can be defined as the width direction of the elastic member 100 perpendicular to the first direction 1D, and the third direction can be defined as the thickness direction of the elastic member 100.

[0122] Alternatively, the first direction 1D can be defined as the width direction of the elastic member 100, and the second direction 2D can be defined as the length direction of the elastic member 100 perpendicular to the first direction 1D, and the third direction can be defined as the thickness direction of the elastic member 100.

[0123] For ease of description, the first direction 1D will be described as the length direction of the elastic member 100, the second direction 2D will be described as the width direction of the elastic member 100, and the third direction will be described as the thickness direction of the elastic member 100.

[0124] The first pattern section 410 can be configured to extend in multiple directions.

[0125] In detail, the first patterned portion 410 can extend in a first direction 1D corresponding to the length direction of the elastic member 100 and in a second direction 2D corresponding to the width direction of the elastic member 100. That is, the first patterned portion 410 can extend in the first region 1A of the elastic member 100 in the first direction 1D corresponding to the long side direction of the elastic member 100, and can extend in the second direction 2D corresponding to the short side direction of the elastic member 100.

[0126] The first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can extend in mutually intersecting directions. The first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can be connected to each other. Accordingly, the first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can be integrally formed while extending in mutually intersecting directions.

[0127] refer to Figures 5 to 10 The second patterned portion 420 may be different from the first patterned portion 410 and may be defined as an unetched area of ​​the elastic member 100, while the first patterned portion 410 is an etched area formed in the first region 1A.

[0128] In other words, the second pattern portion 420 can be the relief pattern remaining in the first region 1A after the first pattern portion 410 (which is an intaglio pattern) is formed. Accordingly, the upper surface of the second pattern portion 420 can be provided on the same plane as the first surface 1S of the elastic member 100.

[0129] The second pattern portion 420 may include a plurality of second pattern portions. More specifically, the second pattern portion 420 may include a plurality of second pattern portions spaced apart from each other. That is, the second pattern portion 420 may be configured such that the size of the first pattern portion 410 is spaced apart from each other by the first pattern portion 410 disposed between adjacent second pattern portions 420.

[0130] The height h of the second pattern section 420 can be defined as the distance from the bottom surface BS of the first pattern section 410 to the first surface 1S of the elastic member.

[0131] In other words, the height h of the second pattern portion 420 can be the same as or similar to the depth d of the first pattern portion 410.

[0132] Furthermore, the height h of the plurality of second pattern portions 420 can be uniform. Specifically, the difference in height h between the plurality of second pattern portions 420 can be 3% or less. More specifically, the difference in height h between the plurality of second pattern portions 420 can be 1% to 3%.

[0133] When the difference in height h of the multiple second pattern portions 420 exceeds 3%, the difference in depth d of the first pattern portion 410 disposed between the second pattern portions 420 increases, which may result in uneven thickness of the first pattern portion 410. Therefore, depending on the region of the first pattern portion 410, the degree of stress distribution varies, and correspondingly, the elastic member 100 may bend, and the reliability may deteriorate.

[0134] The second pattern portion 420 may include a plurality of second pattern portions with different shapes. More specifically, the second pattern portion 420 may include a first pattern 421 and a second pattern 422 with different shapes.

[0135] Meanwhile, the accompanying drawings show that the second pattern portion 420 is formed as a quadrilateral, but the embodiments are not limited to this. The second pattern portion 420 can be formed as a circular shape with a curved surface or various polygons such as triangles, pentagons, hexagons, etc.

[0136] Furthermore, both the first pattern 421 and the second pattern 422 can be formed as quadrilaterals, or either the first pattern 421 or the second pattern 422 can be formed as a circle and the other pattern can be formed as a polygon, or either the first pattern 421 or the second pattern 422 can be formed as a polygon and the other pattern can be formed as a polygon different from either pattern.

[0137] The first pattern 421 can be configured to be spaced apart from each other in the first direction 1D and the second direction 2D. That is, the first pattern 421 can be configured to extend in the length and width directions of the elastic member 100 while being spaced apart from each other.

[0138] Accordingly, the first pattern 421 may have a first interval s1 in the first direction 1D and a second interval s2 in the second direction 2D.

[0139] Furthermore, the second pattern 422 can be configured to be spaced apart from each other in the first direction 1D and the second direction 2D. That is, the second pattern 422 can be configured to extend in both the length and width directions of the elastic member 100 while being spaced apart from each other.

[0140] Accordingly, the second pattern 422 may have a third interval s3 in the first direction 1D and a fourth interval s4 in the second direction 2D. In this case, the fourth interval s4 may be formed to be larger than the third interval s3.

[0141] By forming the fourth interval s4 to be larger than the third interval s3, the folding of the elastic member 100 can be facilitated and the stress caused by the folding can be reduced.

[0142] The first pattern 421 can be formed to extend in one direction. Specifically, the length of the first pattern 421 can extend in the second direction 2D, and the width of the first pattern 421 can extend in the first direction 1D. That is, the first pattern 421 can have a long side formed in the second direction 2D and a short side formed in the first direction 1D.

[0143] Accordingly, when the elastic member 100 is folded or restored in the direction of the folding axis, the plastic deformation of the elastic member 100 can be minimized.

[0144] The first pattern 421 can be used together with the first pattern portion 410 to fold the elastic member 100. That is, the elastic member 100 can have its thickness reduced in the first folded region by the first pattern portion 410 and the first pattern 421. Therefore, the stress-generating region when the elastic member is folded can be reduced in the elastic member 100. Specifically, by reducing the thickness of the elastic member in the first region 1A, which is proportional to the compressive stress, the compressive stress generated when the elastic member is folded can be reduced.

[0145] In other words, since the thickness of the elastic member 100 is reduced in the area where the elastic member 100 is folded by the first pattern portion 410 and the first pattern 421, thereby reducing the compressive stress, the elastic member 100 can be prevented from deforming due to folding stress.

[0146] The second pattern 422 can be used to distribute tensile stress. Specifically, tensile stress can be generated in the elastic member 100 when it is repeatedly folded. When tensile stress is concentrated in a specific area, cracks or deformations such as bending may occur in the elastic member 100.

[0147] Accordingly, the second pattern 422 can be disposed between the first pattern portions 410, i.e. at appropriate positions of the first pattern portions 410, to control the movement of tensile stress. Accordingly, bending or breakage of the elastic member 100 due to the concentration of tensile stress in a specific area when the elastic member 100 is folded can be prevented.

[0148] Therefore, the second pattern 422 can be disposed between the first patterns 421. That is, the second pattern 422 can be spaced apart from the first pattern 421 and disposed between the first patterns 421.

[0149] In detail, the plurality of second patterns 422 can be configured to extend in the first direction 1D while being spaced apart from each other between the first patterns 421 spaced apart in the second direction 2D. That is, the plurality of second patterns 422 can be configured to extend in the first direction 1D within the second interval s2 of the first patterns 421 spaced apart in the second direction 2D.

[0150] In this way, by preventing the tensile stress generated in a direction perpendicular to the folding axis C of the elastic member 100 when the elastic member 100 is folded from concentrating in one area, bending or breakage of the elastic member 100 can be prevented.

[0151] Furthermore, a plurality of second patterns 422 may be configured to extend in the first direction. Specifically, the plurality of second patterns 422 may be positioned between the first patterns 421 at locations overlapping the folding axis C of the elastic member 100, with the first patterns 421 spaced apart from each other in the second direction. Additionally, the second patterns 422 may be configured to overlap with a plurality of imaginary lines parallel to the folding axis C of the elastic member 100.

[0152] Accordingly, when the elastic member is folded along the folding axis C, the tensile stress moving through the first pattern portion 410 extending along the folding axis can be controlled by the second pattern 422. Therefore, stress concentration in specific areas of the elastic member can be prevented.

[0153] The length l of the second pattern 422 may be the same as or different from the first interval s1 of the first pattern 421. That is, the two ends of the second pattern 422 in the first direction may overlap with the two ends of the first interval s1 of the first pattern 421, or may be set inside or outside the first pattern 421.

[0154] That is, the length l of the second pattern 422 in the first direction 1D can be the same as or different from the size of the first interval s1. In other words, the length l of the second pattern 422 in the first direction 1D can be the same as the size of the first interval s1, or smaller or larger than the size of the first interval s1.

[0155] For example, the length l of the second pattern 422 can be equal to or less than twice the spacing p of the first pattern 421 in the first direction.

[0156] When the length l of the second pattern 422 is equal to or greater than the first interval s1 of the first pattern 421, the tensile stress moving along the folding axis can be effectively distributed by the second pattern 422, and thus stress concentration on the side surface of the second pattern 422 can be prevented. Accordingly, cracks in the second pattern 422 in the lateral direction can be prevented.

[0157] Furthermore, when the length l of the second pattern 422 is less than the first interval s1 of the first pattern 421, the overall folding elastic force of the elastic member may decrease due to the reduced area of ​​the first pattern 421. However, the stress generated in the folding region of the elastic member can be effectively distributed, thereby preventing stress concentration in specific areas of the folding region. Accordingly, cracks in the folding region of the elastic member can be prevented.

[0158] Figure 11 and 12 This is a view used to describe the stress distribution along the length l of the elastic member in the second pattern 422. In detail, Figure 11 and 12 It is a view used to describe the stress distribution of the elastic member along the length l of the second pattern 422 when the elastic member is folded with a radius of curvature of 1.5 mm.

[0159] Figure 11 This is a view showing the stress distribution of the elastic member when the length l of the second pattern 422 is greater than the first interval s1 of the first pattern 421, and Figure 12 This is a view showing the stress distribution of the elastic member when the length l of the second pattern 422 is less than the first interval s1 of the first pattern 421.

[0160] refer to Figure 11 The elastic member can effectively distribute the tensile stress moving along the folding axis through the second pattern 422, thus minimizing the stress concentration on the side surface of the second pattern 422.

[0161] In addition, refer to Figure 12 ,and Figure 11 In contrast, elastic members can reduce the magnitude of stress generated in the folded area. That is, stress can be distributed more effectively in the folded area, thereby preventing stress concentration in specific areas of the folded area.

[0162] Table 1 below describes the magnitude of the stress generated based on the length l of the second pattern 422, the width w of the second pattern 422, and the size of the first interval s1 of the first pattern 421.

[0163] Table 1

[0164]

[0165] Referring to Table 1, compared to the case where the length l is greater than the first interval s1 (Example 1), when the length l of the second pattern 422 is less than the first interval s1 of the first pattern 421 (Example 2), it can be seen that the stress magnitudes of the first pattern portion (the etched area of ​​the elastic member) and the second pattern portion (the unetched area of ​​the elastic member) are smaller. In other words, when the length l of the second pattern 422 is greater than the first interval s1 of the first pattern 421, it can be seen that the stress in the folded area can be reduced. That is, by changing the length l of the second pattern or the first interval s1 of the first pattern 421, cracking of the second pattern of the elastic member or stress concentration in the folded area of ​​the elastic member can be prevented.

[0166] Furthermore, when the length l of the second pattern 422 exceeds twice the spacing p of the first pattern 421, the second pattern 422 undergoes plastic deformation after the elastic member 100 is folded due to the size of the second pattern 422. Therefore, the folding characteristics of the elastic member may deteriorate, and the elastic member may not be able to recover after folding.

[0167] At the same time, refer to Figure 13 The second pattern 422 can be set in a zigzag pattern on the second direction 2D of the elastic member 100.

[0168] Specifically, the third interval s3 of the second patterns 422 spaced apart in the first direction of the elastic member 100 can be smaller than the fourth interval s4 spaced apart in the second direction. Furthermore, the length l of the second patterns 422 in the first direction can be smaller than the third interval s3 of adjacent second patterns 422.

[0169] By arranging the second pattern 422 in a zigzag pattern, the total area of ​​the second pattern 422 provided on the elastic member 100 can be reduced. Accordingly, by reducing the number of second patterns 422 that are not etched in the first region 1A, which is the folding area of ​​the elastic member 100, the magnitude of the compressive stress proportional to the thickness in the first region 1A can be reduced. Therefore, the elastic member 100 can be easily folded.

[0170] Furthermore, when the elastic member 100 is restored after folding, it can be easily restored by reducing the tensile stress of the elastic member. At the same time, the arrangement of the second pattern 422 can prevent the tensile stress from concentrating in a specific area, thereby improving the folding reliability.

[0171] The elastic member according to the first embodiment can improve the support and folding properties of the elastic member.

[0172] In detail, since the first patterned portion is formed by partially etching the elastic member without penetrating it, the folding of the elastic member can be promoted, and at the same time, the deterioration of the support properties is minimized due to the formation of the patterned portion.

[0173] Furthermore, by providing a second patterned portion that can distribute stress within the first patterned portion in a direction parallel to the folding axis, stress moving through the first patterned portion can be prevented from concentrating in a specific area of ​​the elastic member.

[0174] Therefore, cracks or bending that occur in the elastic member due to stress concentration in a specific area of ​​the elastic member can be prevented.

[0175] Figure 14 This is another top view of the first surface of the elastic member according to the first embodiment.

[0176] refer to Figure 14 In the elastic member 100, a plurality of patterned portions may also be formed in the second region 2A of the elastic member 100. More specifically, a plurality of third patterned portions 430 spaced apart from each other may be provided in the second region 2A of the elastic member 100.

[0177] The third pattern portion 430 can be formed as a hole or a groove. In detail, similar to the first pattern portion 410, the third pattern portion 430 can be formed as an intaglio pattern, wherein the second region 2A of the first surface 1S of the elastic member 100 is partially etched.

[0178] Alternatively, unlike the first patterned portion 410, the third patterned portion 430 may be formed as a hole shape, which is formed to penetrate the first surface 1S and the second surface 2S of the elastic member 100.

[0179] The difference in deformation caused by heat in the first region 1A where the first pattern portion 410 is formed and the second region 2A where the third pattern portion 430 is formed can be reduced by the third pattern portion 430 formed in the second region 2A.

[0180] In detail, by etching the patterned portion of the elastic member partially or completely in both the first region 1A and the second region 2A, the difference between the deformation caused by heat in the first region 1A and the deformation caused by heat in the second region 2A can be mitigated. Therefore, bending or twisting of the elastic member can be prevented.

[0181] Furthermore, the stress unevenness between the first region 1A and the second region 2A can be alleviated by the third pattern portion 430 formed in the second region 2A, thereby preventing the bending of the elastic member.

[0182] Furthermore, when the panel or the like is bonded to the elastic member 100 by the adhesive layer, the adhesive material is configured to fill the interior of the first pattern portion and the third pattern portion by the third pattern portion 430 formed in the second region 2A, thereby preventing the adhesive layer from forming a step difference between the first region and the second region.

[0183] The third pattern portion 430 can be formed in the second region 2A in a regular pattern. Alternatively, the third pattern portion 430 can be formed in the second region 2A in an irregular pattern. For example, the third pattern portion 430 can be formed in different shapes, or the third pattern portion 430 can be arranged in a zigzag position between adjacent columns.

[0184] The third pattern portion 430 can be formed to have a curved surface. In detail, the third pattern portion 430 can be formed to have a curved shape, such as an elliptical shape, a hemispherical shape, or a circular shape.

[0185] However, this embodiment is not limited to this. The third pattern portion 430 can be formed into a polygonal shape, such as a triangle or a quadrilateral, or it can include both a curved surface and a polygonal shape.

[0186] Furthermore, as the third pattern portion approaches the first region, the density of the third pattern portion 430 can be formed to a higher degree. That is, as the third pattern portion approaches the first region, the distance of the third pattern portion 430 decreases, or as the third pattern portion approaches the first region, the density of the third pattern portion 430 can be formed to a higher degree by increasing the size of the third pattern portion 430.

[0187] This can further alleviate the difference between the deformation caused by heat in the first region 1A and the deformation caused by heat in the second region 1A.

[0188] Figure 15 This is another top view of the first surface of the elastic member according to the first embodiment.

[0189] refer to Figure 15 The elastic member 100 may further include a hinge portion.

[0190] For example, the first region 1A and the second region 2A can be divided based on whether a hinge portion is formed. That is, the folding region and the unfolding region can be divided based on whether a hinge portion is formed.

[0191] In detail, multiple hinge portions may be formed in the first region 1A, and the hinge portions may not be formed in the second region 2A.

[0192] In other words, the folded area can be defined as the area that forms the hinge part HN.

[0193] The hinge portion HN can be defined as the point where folding begins in the elastic member 100. That is, in the elastic member, folding can begin from the hinge portions at both ends of a plurality of hinge portions. The hinge portion HN can facilitate the folding of the elastic member 100.

[0194] The hinge portion HN can include multiple hinge portions depending on the folding shape of the elastic member 100. The hinge portion HN can be formed at both ends of the elastic member 100 based on the length of the elastic member 100 in the lateral direction, i.e., the width direction. That is, the hinge portion HN can be formed at both ends of the elastic member 100 that defines the folding axis of the elastic member 100.

[0195] Accordingly, when the elastic member 100 for the display is folded, the folding area can be easily folded through the hinge portion HN.

[0196] The hinge portion HN can be formed by penetrating the first and second surfaces of the transverse region in the end region of the elastic member 100. That is, the hinge portion HN can be defined as a hole through which the two end regions in the transverse direction of the end region of the elastic member 100 are formed.

[0197] The hinge portion HN can be formed with a flat surface or a curved surface. More specifically, the hinge portion can be formed with a curved shape, such as an elliptical shape, a hemispherical shape, or a circular shape.

[0198] However, this embodiment is not limited to this, and the hinge portion can be formed in an elliptical or polygonal shape, such as a triangle or a quadrilateral.

[0199] Furthermore, the hinge portion HN can be formed to have a size different from that of the first pattern portion and the third pattern portion described above. Specifically, the hinge portion HN can be formed to have a size smaller than that of the first pattern portion and the third pattern portion.

[0200] Below, we will refer to Figures 16 to 24 The elastic member according to the second embodiment is described. In the description of the elastic member according to the second embodiment, descriptions that are the same as or similar to those of the elastic member according to the first embodiment described above will be omitted, and the same reference numerals will be assigned to the same parts.

[0201] refer to Figures 16 to 24 The elastic member according to the second embodiment may include multiple layers. More specifically, the elastic member according to the second embodiment may include multiple metal layers.

[0202] For example, the elastic member 100 may include a first layer 110 and a second layer 120 disposed on the first layer 110.

[0203] The first layer 110 and the second layer 120 may have different physical properties. Specifically, the first layer 110 and the second layer 120 may have different tensile strengths. Furthermore, the first layer 110 and the second layer 120 may have different moduli of elasticity.

[0204] For example, the tensile strength of the first layer 110 can be greater than that of the second layer 120. Accordingly, in terms of the tensile stress generated when the elastic member 110 is folded or unfolded again, the first layer 110 can withstand a greater tensile stress than the second layer 120. That is, in the elastic member 100, the strength of the elastic member can be improved by the first layer 110.

[0205] Furthermore, the elastic modulus of the first layer 110 can be larger than that of the second layer 120. Correspondingly, the second layer 120 of the elastic member 100 can experience less stress transmitted by the varying rates of change of each layer as the elastic member 110 is folded or unfolded again. In other words, because the elastic modulus of the second layer 120 is smaller than that of the first layer 110, it can have an improved elongation, i.e., a rate of change, thereby facilitating changes in the shape of the elastic member 100. That is, the elastic force of the elastic member 100 can be improved through the second layer 120.

[0206] The first layer 110 and the second layer 120 may include various metals that meet the physical requirements. For example, the first layer 110 may include stainless steel (SUS), and the second layer 120 may include copper (Cu).

[0207] Furthermore, the first layer 110 and the second layer 120 can have different etching characteristics. Specifically, the first layer 110 and the second layer 120 can be etched by different etchants. Accordingly, the second layer may not be etched by the etchant used to etch the first layer, and the first layer may not be etched by the etchant used to etch the second layer.

[0208] Therefore, when the pattern is formed on the elastic member 100, the depth of the pattern and the thickness of the remaining elastic member can be easily controlled. In other words, by forming the elastic member into multiple layers that react with different etchants, the desired depth of the pattern and the thickness of the remaining elastic member can be easily controlled.

[0209] The first layer 110 and the second layer 120 can be formed to have different thicknesses. Specifically, the thickness of the first layer 110 can be smaller than the thickness of the second layer 120.

[0210] For example, the thickness of the first layer 110 can be from 5 μm to 50 μm. In addition, the thickness of the second layer 120 can be from 10 μm to 200 μm.

[0211] When the thickness of the first layer 110 is less than 5 μm, the support force and tensile strength of the elastic member may decrease, and when the thickness of the first layer 110 exceeds 50 μm, the stress of the first layer 110 increases, thereby causing plastic deformation of the elastic member during folding, and thus the folding characteristics may deteriorate.

[0212] When the thickness of the second layer 120 is less than 10 μm, the elastic force of the elastic member may not be fully guaranteed. When the thickness of the second layer 120 exceeds 200 μm, the stress generated when the elastic member is folded increases due to the increased thickness of the second layer 120, and therefore the folding characteristics may deteriorate.

[0213] refer to Figure 16 The elastic member 100 may include a plurality of patterned portions. Specifically, the plurality of patterned portions may be disposed in a first region 1A of the elastic member 100. That is, the plurality of patterned portions may be disposed in a first region 1A defined as a folded region of the elastic member 100.

[0214] The patterned portion 400 may be disposed on at least one of the first surface 1S and the second surface 2S of the elastic member 100. More specifically, when the elastic member 100 is folded, the patterned portion 400 may be disposed on the folded outer surface of the elastic member 100.

[0215] In detail, the patterned portion 400 may be disposed on the first layer 110 or the second layer 120 of the elastic member 100. More specifically, the patterned portion 400 may be formed on a surface of the second layer 120 to ensure the elastic force and folding reliability of the elastic member 100.

[0216] The pattern portion may include multiple pattern portions that have different shapes from each other. In detail, the pattern portion may include a first pattern portion 410 and a second pattern portion 420 that have different shapes from each other.

[0217] refer to Figures 17 to 20 The first patterned portion 410 can be formed by etching the elastic member 100. More specifically, the first patterned portion 410 can be formed by partially etching the elastic member 100. That is, the first patterned portion 410 can be formed as an intaglio pattern. In other words, the first patterned portion 410 can be a groove formed on the first surface 1S of the elastic member 100.

[0218] In detail, the first patterned portion 410 may be disposed on one surface of the second layer 120 among the multiple layers of the elastic member 100. That is, the first patterned portion 410 may be formed to completely or partially penetrate the second layer 120 of the elastic member.

[0219] For example, refer to Figure 18The first patterned portion 410 can be formed to integrally penetrate the second layer 120. Accordingly, the bottom surface BS and the inner surface IS of the first patterned portion 410 can include different materials. In detail, the bottom surface BS of the first patterned portion 410 can include the material of the first layer 110, and the inner surface IS of the first patterned portion 410 can include the material of the second layer 120.

[0220] Alternatively, although shown in the figures, the first patterned portion 410 may be formed to partially penetrate the second layer 120. Accordingly, the bottom surface BS and the inner surface IS of the first patterned portion 410 may comprise the same material. In detail, the bottom surface BS and the inner surface IS of the first patterned portion 410 may comprise the material of the second layer 120.

[0221] The following will mainly describe the case where the first pattern portion 410 is formed to completely penetrate the second layer 120.

[0222] The figure shows that the first pattern portion 410 is formed with a constant width in the depth direction. However, this embodiment is not limited to this. The inner surface of the first pattern portion 410 may have a certain tilt angle so that, depending on the etching method and time, the width of the first pattern portion 410 may become wider or narrower as it extends in the depth direction.

[0223] Furthermore, the accompanying drawings show that the inner surface IS of the first patterned portion 410 is a flat surface, but this embodiment is not limited to this. The inner surface of the first patterned portion 410 may include a curved surface, or it may have surface roughness through multiple concave and convex patterns, etc.

[0224] Furthermore, the bottom surface BS of the first pattern section 410 can have various shapes.

[0225] refer to Figure 18 The bottom surface BS of the first patterned portion 410 can be formed as a flat surface. Alternatively, refer to... Figure 19 The bottom surface BS of the first patterned portion 410 may include a convex surface in the depth direction of the first patterned portion 410.

[0226] In detail, the bottom surface BS of the first patterned portion 410 can be formed to have a radius of curvature of 0.1 mm or greater. When the radius of curvature of the bottom surface BS of the first patterned portion 410 is less than 0.1 mm, when the elastic member is folded, depending on the size of the radius of curvature, stress is concentrated in a specific first patterned portion due to the thickness deviation, and therefore the folding characteristics may deteriorate.

[0227] The depth d of the first patterned portion 410 can vary depending on the thickness of the elastic member 100. Furthermore, the depth d of the first patterned portion 410 can vary depending on the degree to which the elastic member 100 is folded, i.e., the radius of curvature of the folded elastic member 100. Here, the depth d of the first patterned portion 410 can be defined as the maximum distance from the bottom surface BS of the first patterned portion 410 to the first surface 1S of the elastic member 100. In other words, the depth d of the first patterned portion 410 can be defined as the maximum distance from the bottom surface of the first patterned portion 410 to the upper surface of the second layer 120.

[0228] For example, when the first pattern portion 410 is formed to completely penetrate the second layer 120, the depth d of the first pattern portion 410 should be equal to or greater than the thickness of the second layer 120. Furthermore, when the first pattern portion 410 is formed to partially penetrate the second layer 120, the depth d of the first pattern portion 410 may be less than the thickness of the second layer 120.

[0229] In other words, the depth d of the first pattern portion 410 can be less than the thickness of the second layer 120, or greater than or equal to the thickness of the second layer 120.

[0230] The thickness t of the first patterned portion 410 can vary depending on the depth of the first patterned portion 410. When the depth of the first patterned portion 410 is greater than or equal to the thickness of the second layer 120, the thickness t of the first patterned portion 410 can be defined as the thickness of the first layer 110. Furthermore, when the depth of the first patterned portion 410 is less than the thickness of the second layer 120, the thickness t of the first patterned portion 410 can be defined as the thickness of both the first layer 110 and the second layer 120.

[0231] The thickness t of the first patterned portion 410 can vary depending on the degree to which the elastic member 100 is folded, i.e., the radius of curvature of the elastic member 100 after folding.

[0232] The thickness t of the first patterned portion 410 can vary depending on the depth of the first patterned portion 410. For example, when the depth of the first patterned portion 410 is equal to or greater than the thickness of the second layer 120, the thickness t of the first patterned portion 410 can be defined as the thickness of the first layer 110. Furthermore, when the depth of the first patterned portion 410 is less than the thickness of the second layer 120, the thickness t of the first patterned portion 410 can be defined as the thickness of the first layer 110 and the second layer 120.

[0233] The thickness t of the first patterned portion 410 can be defined as the remaining thickness of the elastic member after the first patterned portion 410 is formed on the first surface 1S of the elastic member. That is, the thickness t of the first patterned portion 410 can be defined as the distance from the bottom surface BS of the first patterned portion 410 to the second surface 2S of the elastic member 100. More specifically, the thickness t of the first patterned portion 410 can be defined as the maximum distance from the bottom surface BS of the first patterned portion 410 to the second surface 2S of the elastic member 100.

[0234] In detail, when the elastic member 100 is folded so that the radius of curvature of the elastic member 100 is 5 mm or less, the thickness t of the first patterned portion 410 can be 50 μm or less.

[0235] In detail, when the elastic member 100 is folded to make the radius of curvature greater than 0.5 mm and smaller than 5 mm, the thickness t of the first patterned portion 410 can be 50 μm or less.

[0236] In this case, when the first pattern portion 410 is formed to completely penetrate the second layer 120, the thickness t of the first pattern portion 410 can be defined as the thickness of the first layer 110.

[0237] Furthermore, when the first pattern portion 410 is formed to partially penetrate the second layer 120, the thickness t of the first pattern portion 410 can be defined as the sum of the thicknesses of the first layer 110 and the second layer 120.

[0238] More specifically, when the elastic member 100 is folded so that the radius of curvature is greater than 0.5 mm and is 5 mm or less, the thickness t of the first patterned portion 410 can be from 5 μm to 50 μm.

[0239] When the thickness t of the first patterned portion 410 is less than 5 μm within the radius of curvature of the elastic member 100, the reduction in the thickness of the first patterned portion 410 decreases the elastic force of the elastic member, and therefore the restoring force after folding may decrease, as well as the supporting force for supporting the display panel disposed on the elastic member 100 may decrease.

[0240] Furthermore, when the thickness t of the first patterned portion 410 is formed to be greater than 50 μm within the range of the radius of curvature of the elastic member 100, plastic deformation occurs in the first region 1A, which is the folding region, due to the increase in the thickness of the first patterned portion 410 after folding, and thus the folding characteristics may deteriorate.

[0241] The first patterned portion 410 can be configured to extend in multiple directions. Specifically, the first patterned portion 410 can extend in a first direction 1D corresponding to the length direction of the elastic member 100 and in a second direction 2D corresponding to the width direction of the elastic member 100. That is, the first patterned portion 410 can extend in the first region 1A of the elastic member 100 in the first direction 1D corresponding to the long side direction of the elastic member 100 and in the second direction 2D corresponding to the short side direction of the elastic member 100.

[0242] The first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can extend in mutually intersecting directions. The first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can be connected to each other. Therefore, the first pattern portion 410 extending in the first direction 1D and the first pattern portion 410 extending in the second direction 2D can be integrally formed.

[0243] refer to Figures 16 to 21 The second patterned portion 420 may be different from the first patterned portion 410 and may be defined as an unetched area of ​​the elastic member 100, while the first patterned portion 410 is an etched area formed in the first region 1A.

[0244] In other words, the second pattern portion 420 can be the relief pattern remaining in the first region 1A after the first pattern portion 410 (which is an intaglio pattern) is formed. Accordingly, the upper surface of the second pattern portion 420 can be provided on the same plane as the first surface 1S of the elastic member 100.

[0245] In other words, the upper surface of the second patterned portion 410 can be the upper surface of the second layer 120. Furthermore, the upper surface of the second patterned portion 410 can be the upper surface of the second layer 120, and the lower surface of the second patterned portion 410 opposite to the upper surface can be the lower surface of the first layer 110.

[0246] The second pattern portion 420 may include a plurality of second pattern portions. More specifically, the second pattern portion 420 may include a plurality of second pattern portions spaced apart from each other. That is, the second pattern portions 420 may be configured to be spaced apart from each other by first pattern portions 410 disposed between adjacent second pattern portions 420.

[0247] The height h of the second patterned portion 420 can be defined as the distance from the bottom surface BS of the first patterned portion 410 to the first surface 1S of the elastic member. That is, the height h of the second patterned portion 420 can be the same as or similar to the depth d of the first patterned portion 410.

[0248] Furthermore, the height h of the plurality of second pattern portions 420 can be uniform. Specifically, the difference in height h between the plurality of second pattern portions 420 can be 3% or less. More specifically, the difference in height h between the plurality of second pattern portions 420 can be 1% to 3%.

[0249] When the difference in height h of the multiple second pattern portions 420 exceeds 3%, the difference in depth d of the first pattern portion 410 disposed between the second pattern portions 420 increases, which may result in uneven thickness of the first pattern portion 410. Accordingly, the degree of stress distribution varies according to each region of the first pattern portion 410, and consequently, the elastic member 100 may bend, and reliability may deteriorate.

[0250] The second pattern portion 420 may include a plurality of second pattern portions with different shapes. More specifically, the second pattern portion 420 may include a first pattern 421 and a second pattern 422 with different shapes.

[0251] Meanwhile, the accompanying drawings show that the second pattern portion 420 is formed as a quadrilateral, but this embodiment is not limited to this. The second pattern portion 420 can be formed as a circular shape with a curved surface or various polygonal shapes, such as triangles, pentagons, hexagons, etc. In addition, the first pattern 421 and the second pattern 422 can both be formed as quadrilaterals, or either the first pattern 421 or the second pattern 422 can be formed as a circular shape, while the other pattern can be formed as a polygonal shape, or either the first pattern 421 or the second pattern 422 can be formed as a polygonal shape, while the other pattern can be formed as a polygonal shape different from either pattern portion.

[0252] The first pattern 421 can be configured to be spaced apart from each other in the first direction 1D and the second direction 2D. That is, the first pattern 421 can be configured to extend in the length and width directions of the elastic member 100 while being spaced apart from each other.

[0253] Accordingly, the first pattern 421 may have a first interval s1 in the first direction 1D and a second interval s2 in the second direction 2D.

[0254] Furthermore, the second pattern 422 can be configured to be spaced apart from each other in the first direction 1D and the second direction 2D. That is, the second pattern 422 can be configured to extend in both the length and width directions of the elastic member 100 while being spaced apart from each other.

[0255] Accordingly, the second pattern 422 may have a third interval s3 in the first direction 1D and a fourth interval s4 in the second direction 2D. In this case, the fourth interval s4 may be formed to be larger than the third interval s3.

[0256] By forming the fourth interval s4 to be larger than the third interval s3, the folding of the elastic member 100 can be facilitated and the stress caused by the folding can be reduced.

[0257] The first pattern 421 can be formed in a manner that extends in one direction. Specifically, the length of the first pattern 421 can extend in the second direction 2D, and the width of the first pattern 421 can extend in the first direction 1D. That is, the first pattern 421 can have a long side formed in the second direction 2D and a short side formed in the first direction 1D.

[0258] The first pattern 421 can be used together with the first pattern portion 410 to fold the elastic member 100. That is, the elastic member 100 can reduce the thickness of the first region folded in the elastic member 100 by using the first pattern portion 410 and the first pattern 421. Therefore, in the elastic member 100, the stress-generating region generated when the elastic member is folded can be reduced. That is, by reducing the thickness of the elastic member in the first region 1A, which is proportional to the stress, the stress generated when the elastic member is folded can be reduced, where the first region 1A is the folding region of the elastic member.

[0259] In other words, since the thickness of the elastic member is reduced in the area where the elastic member 100 is folded by the first pattern portion 410 and the first pattern 421, the elastic member 100 can be prevented from deforming due to folding stress.

[0260] The second pattern 422 can be used to distribute tensile stress. In detail, when the elastic member 100 is folded, tensile stress is generated in the elastic member, and the tensile stress is concentrated in a specific area, so cracks or deformations such as bending may occur in the elastic member 100.

[0261] Accordingly, the second pattern 422 can be disposed between the first pattern portions 410, i.e. at appropriate positions within the first pattern portions 410, to control the movement of tensile stress. Consequently, bending or breakage of the elastic member 100 due to the concentration of tensile stress in a specific area can be prevented when the elastic member 100 is folded.

[0262] Therefore, the second pattern 422 can be disposed between the first patterns 421. That is, the second pattern 422 can be spaced apart from the first pattern 421 and disposed between the first patterns 421.

[0263] In detail, the second pattern 422 can be configured to extend in the first direction between the first patterns 421 spaced apart in the second direction. That is, the second pattern 422 can be configured to extend in the first direction within the second interval s2 of the first patterns 421 spaced apart in the second direction.

[0264] Therefore, by preventing the tensile stress generated in a direction perpendicular to the folding axis C of the elastic member 100 when the elastic member 100 is folded from concentrating in one area, bending or breakage of the elastic member 100 can be prevented.

[0265] Furthermore, a plurality of second patterns 422 may be configured to extend in the first direction. Specifically, the plurality of second patterns 422 may be positioned between first patterns 421 spaced apart in the second direction at locations overlapping the folding axis C of the elastic member 100. Furthermore, the second patterns 422 may be configured to overlap with an imaginary line parallel to the folding axis C of the elastic member 100.

[0266] Accordingly, when the elastic member is folded along the folding axis C, the tensile stress caused by the movement of the first pattern portion 410 extending along the folding axis can be controlled by the second pattern 422, and thus stress concentration in a specific area of ​​the elastic member can be prevented.

[0267] The length l of the second pattern 422 may be the same as or different from the first interval s1 of the first pattern 421. That is, the two ends of the second pattern 422 in the first direction may overlap with the two ends of the first interval s1 of the first pattern 421, or may be set inside or outside the first pattern 421.

[0268] That is, the length l of the second pattern 422 in the first direction 1D can be the same as or different from the size of the first interval s1. In other words, the length l of the second pattern 422 in the first direction 1D can be the same as the size of the first interval s1, or smaller or larger than the size of the first interval s1.

[0269] For example, the length l of the second pattern 422 can be equal to or less than twice the spacing p of the first pattern 421 in the first direction.

[0270] When the length l of the second pattern 422 is equal to or greater than the first interval s1 of the first pattern 421, the tensile stress moving along the folding axis can be effectively distributed by the second pattern 422, and thus stress concentration on the side surface of the second pattern 422 can be prevented. Accordingly, cracks in the lateral direction of the second pattern 422 can be prevented.

[0271] Furthermore, when the length l of the second pattern 422 is less than the first interval s1 of the first pattern 421, the overall folding elastic force of the elastic member may decrease due to the reduced area of ​​the first pattern 421. However, the stress generated in the folding region of the elastic member can be effectively distributed, thereby preventing stress concentration in specific areas of the folding region. Accordingly, cracks in the folding region of the elastic member can be prevented.

[0272] Furthermore, when the length l of the second pattern 422 exceeds twice the spacing p of the first pattern 421, plastic deformation occurs in the second pattern 422 after the elastic member 100 is folded due to the size of the second pattern 422. Therefore, the folding characteristics of the elastic member may deteriorate, and the elastic member may not be able to recover after folding.

[0273] refer to Figure 22 The second pattern 422 can be arranged in a zigzag pattern on the second direction 2D of the elastic member 100.

[0274] Specifically, the third interval s3 of the second patterns 422 spaced apart in the first direction of the elastic member 100 can be smaller than the fourth interval s4 spaced apart in the second direction. Furthermore, the length l of the second pattern 422 in the first direction can be smaller than the third interval s3 of adjacent second patterns 422.

[0275] By arranging the second pattern 422 in a zigzag pattern, the total area of ​​the second pattern 422 provided on the elastic member 100 can be reduced. Accordingly, by reducing the number of second patterns 422 that are not etched in the first region 1A, which is the folding area of ​​the elastic member 100, the magnitude of the compressive stress proportional to the thickness in the first region 1A can be reduced. Therefore, the elastic member 100 can be easily folded.

[0276] Furthermore, when the elastic member 100 is restored after folding, it can be easily restored by reducing the tensile stress on the elastic member. At the same time, due to the arrangement of the second pattern 422, the folding reliability can be improved by preventing the tensile stress from concentrating in a specific area.

[0277] The elastic member according to the second embodiment can improve the support and folding properties of the elastic member.

[0278] In detail, since the first patterned portion is formed by partially etching the elastic member without penetrating it, the folding of the elastic member can be promoted. At the same time, due to the formation of the patterned portion, the deterioration of the support properties can be minimized.

[0279] Furthermore, by providing a second pattern portion that can distribute stress in a direction parallel to the folding axis within the first pattern portion, it is possible to prevent stress moving through the first pattern portion from concentrating in a specific area of ​​the elastic member.

[0280] Accordingly, it can prevent cracks or bending of the elastic member due to stress concentration in a specific area of ​​the elastic member.

[0281] Furthermore, in the elastic member according to the second embodiment, by forming the elastic member into multiple layers, both the tensile properties and elastic properties of the elastic member can be improved.

[0282] That is, a first layer with good tensile properties is formed as the support layer of the elastic member, and a second layer with a small elastic modulus is disposed on the first layer as a reinforcing layer, so that the tensile strength and support force of the elastic member are fully provided by the first layer. Sufficient elastic force can be ensured by promoting the deformation of the elastic member through the second layer.

[0283] Therefore, the elastic member according to the second embodiment can ensure elastic force together with the tensile properties of the elastic member, and thus can have improved folding characteristics.

[0284] Figure 23 This is another top view of the first surface of the elastic member according to the second embodiment.

[0285] refer to Figure 23 In the elastic member 100, a plurality of patterned portions may also be formed in the second region 2A of the elastic member 100. More specifically, a plurality of third patterned portions 430 spaced apart from each other may be provided in the second region 2A of the elastic member 100.

[0286] The third pattern portion 430 can be formed as a hole or a groove. In detail, similar to the first pattern portion 410, the third pattern portion 430 can be formed as an intaglio pattern, wherein the second region 2A of the first surface 1S of the elastic member 100 is partially etched.

[0287] In other words, the third pattern portion 430 can be formed to completely penetrate the second layer 120 in order to expose one surface of the first layer 110, or the third pattern portion 430 can be formed to partially penetrate the second layer 120 in order to expose one surface of the second layer 120.

[0288] Alternatively, unlike the first patterned portion 410, the third patterned portion 430 may be formed as a hole shape, which is formed to penetrate the first surface 1S and the second surface 2S of the elastic member 100.

[0289] In other words, the third patterned portion 430 can be formed as a hole shape that completely penetrates the first layer 110 and the second layer 120.

[0290] The difference in deformation caused by heat between the first region 1A forming the first pattern portion 410 and the second region 2A forming the third pattern portion 430 can be reduced by the third pattern portion 430 formed in the second region 2A.

[0291] In detail, by forming patterned portions in both the first region 1A and the second region 2A through partial or complete etching of the elastic member, the difference between deformation caused by heat in the first region 1A and deformation caused by heat in the second region 2A can be mitigated. Therefore, bending or twisting of the elastic member can be prevented.

[0292] Furthermore, by mitigating the stress unevenness between the first region 1A and the second region 2A through the third pattern portion 430 formed in the second region 2A, bending of the elastic member can be prevented.

[0293] Furthermore, by means of the third pattern portion 430 formed in the second region 2A, when the panel or the like is adhered to the elastic member 100 by the adhesive layer, the adhesive material is configured to fill the interior of the first pattern portion and the third pattern portion, thereby preventing the adhesive layer from forming a step difference between the first region and the second region.

[0294] The third pattern portion 430 can be formed in a regular pattern in the second region 2A. Alternatively, the third pattern portion 430 can be formed in an irregular pattern in the second region 2A. For example, the third pattern portion 430 can be formed in different shapes, or the third pattern portion 430 can be positioned in a zigzag pattern between adjacent columns.

[0295] The third pattern portion 430 can be formed to have a curved surface. In detail, the third pattern portion 430 can be formed to have a curved shape, such as an elliptical shape, a hemispherical shape, or a circular shape.

[0296] However, this embodiment is not limited to this, and the third patterned portion 430 may be formed as a polygonal shape, such as a triangle or a quadrilateral, or may include both an arcuate surface and a polygonal shape.

[0297] Furthermore, as the third pattern portion approaches the first region, the density of the third pattern portion 430 can be formed to be higher. That is, as the third pattern portion approaches the first region, the distance of the third pattern portion 430 decreases, or as the third pattern portion approaches the first region, the density of the third pattern portion 430 can be formed to be higher by increasing the size of the third pattern portion 430.

[0298] This can further alleviate the difference between the deformation caused by heat in the first region 1A and the deformation caused by heat in the second region 1A.

[0299] Figure 24 This is another top view of the first surface of the elastic member according to the second embodiment.

[0300] refer to Figure 24 The elastic member 100 may further include a hinge portion.

[0301] For example, the first region 1A and the second region 2A can be distinguished based on whether a hinge portion is formed. In other words, the folding region and the unfolding region can be divided based on whether a hinge portion is formed.

[0302] In detail, multiple hinge portions may be formed in the first region 1A, and the hinge portions may not be formed in the second region 2A.

[0303] In other words, the folded area can be defined as the area that forms the hinge part HN.

[0304] The hinge portion HN can be defined as the point where folding begins in the elastic member 100. That is, in the elastic member, folding can begin from the hinge portions at both ends of a plurality of hinge portions. The hinge portion HN can facilitate the folding of the elastic member 100.

[0305] The hinge portion HN can include multiple hinge portions depending on the folding shape of the elastic member 100. The hinge portion HN can be formed at both ends of the elastic member 100 based on the length of the elastic member 100 in the lateral direction, i.e., the width direction. That is, the hinge portion HN can be formed at both ends of the elastic member 100 that defines the folding axis of the elastic member 100.

[0306] Accordingly, when the elastic member 100 for the display is folded, the folding area can be easily folded through the hinge portion HN.

[0307] The hinge portion HN can be formed by penetrating the first and second surfaces of the transverse region in the end region of the elastic member 100. That is, the hinge portion HN can be defined as a hole through which the two end regions in the transverse direction of the end region of the elastic member 100 are formed.

[0308] The hinge portion HN can be formed to have a flat surface or a curved surface. More specifically, the hinge portion can be formed to have a curved shape, such as an elliptical shape, a hemispherical shape, or a circular shape.

[0309] However, this embodiment is not limited to this, and the hinge portion can be formed in an elliptical or polygonal shape, such as a triangle or a quadrilateral.

[0310] Figure 25 This is a view used to describe an example of applying an elastic component according to an embodiment.

[0311] refer to Figure 25 The elastic member according to the embodiment can be applied to a flexible display device or a foldable display device for displaying a display.

[0312] For example, the elastic member according to embodiments of the present invention can be applied to flexible display devices, such as mobile phones or tablet computers.

[0313] Such elastic components can be applied to flexible, bending, or folding flexible display devices, such as mobile phones or tablets.

[0314] Elastic components are used in flexible, bending, or folding flexible display devices, such as mobile phones or tablets, to improve the reliability of folding in display devices that are repeatedly folded or restored, thereby improving the reliability of flexible display devices.

[0315] The features, structures, and effects described in the above embodiments are included in at least one embodiment, but are not limited to one embodiment. Furthermore, the features, structures, and effects shown in each embodiment can be combined or modified by those skilled in the art to create other embodiments. Therefore, it should be understood that anything relating to such combinations and modifications is included within the scope of this disclosure.

[0316] Furthermore, while the foregoing primarily describes embodiments, these embodiments are merely examples and do not limit the scope of this disclosure. Those skilled in the art will understand that numerous variations and applications not described above can be made without departing from the fundamental characteristics of the embodiments. For instance, each component specifically shown in the embodiments can be modified and implemented. Moreover, it should be understood that differences relating to such variations and applications are included within the scope of this disclosure as defined in the following claims.

Claims

1. An elastic member comprising: a first surface and a second surface opposite to the first surface; and a first region and a second region, wherein a first direction in a lengthwise direction and a second direction in a widthwise direction are defined, the first region is defined as a folded region, and the second region is defined as an unfolded region, a first pattern portion having a concave shape and a second pattern portion having a convex shape are formed in the first region, the second pattern portion includes a plurality of first patterns and a plurality of second patterns, the plurality of first patterns are spaced apart from each other, the plurality of second patterns are spaced apart from each other, and a length of each of the plurality of first patterns extends in the second direction, and a length of each of the plurality of second patterns extends in the first direction, and the plurality of first patterns and the plurality of second patterns are spaced apart from each other.

2. The elastic member of claim 1, wherein, the first pattern portion includes an inner surface and a bottom surface connected to the inner surface, and a radius of curvature of the bottom surface of the first pattern portion is 0.1 mm or more.

3. The elastic member of claim 1, wherein, the first pattern portion extends in the first direction and in the second direction, the plurality of first patterns are arranged to be spaced apart in the second direction, and the plurality of second patterns are arranged between the plurality of first patterns adjacent in the second direction.

4. The elastic member of claim 1, wherein, the first pattern portion extending in the first direction and the first pattern portion extending in the second direction are connected to each other.

5. The elastic member of claim 1, wherein, the length of each of the plurality of second patterns is equal to or less than twice a pitch of the plurality of first patterns in the first direction.

6. The elastic member of claim 1, wherein, the plurality of second patterns are spaced apart at a third interval in the first direction and at a fourth interval in the second direction, the fourth interval is larger than the third interval.

7. The elastic member of claim 1, wherein, the plurality of second patterns are arranged at positions overlapping with an imaginary line parallel to a folding axis of the elastic member between the plurality of first patterns.

8. The elastic member of claim 1, wherein, the plurality of second patterns are arranged in a zigzag manner in the second direction.

9. The elastic member of claim 8, wherein, the plurality of second patterns are spaced apart at a third interval in the first direction and at a fourth interval in the second direction, the third interval is smaller than the fourth interval, and a length of each of the plurality of second patterns is smaller than the third interval.

10. The elastic member according to claim 1, further comprising a third pattern portion arranged in the second region.

11. An elastic member comprising: a first surface and a second surface opposite to the first surface; a first region and a second region; and a first layer and a second layer arranged on the first layer, wherein the first region is defined as a folded region, and the second region is defined as an unfolded region, a first pattern portion having a concave shape and a second pattern portion having a convex shape are formed on the second layer in the first region, the second pattern portion includes a plurality of first patterns and a plurality of second patterns, the plurality of first patterns are spaced apart from each other, the plurality of second patterns are spaced apart from each other, a length of each of the plurality of first patterns extends in a second direction, and a length of each of the plurality of second patterns extends in a first direction, the tensile strength of the first layer is greater than the tensile strength of the second layer, the elastic modulus of the first layer is greater than the elastic modulus of the second layer, and the plurality of first patterns and the plurality of second patterns are spaced apart from each other.

12. The elastic member of claim 11, wherein, the plurality of second patterns are disposed at positions between the plurality of first patterns which overlap with an imaginary line parallel to a folding axis of the elastic member.

13. The elastic member of claim 11, wherein, the first pattern portion extends in the first direction and the second direction, the plurality of first patterns are disposed to be spaced apart in the second direction, the plurality of second patterns are disposed between the plurality of first patterns adjacent in the second direction.

14. The elastomeric member of claim 11, wherein, the plurality of second patterns are separated by a third interval in the first direction and by a fourth interval in the second direction, and the fourth interval is greater than the third interval.

15. A display device, comprising: an elastic member; a panel disposed on the elastic member and including at least one of a display panel and a touch panel; and an adhesive layer disposed between the elastic member and the panel, wherein the elastic member includes the elastic member according to claim 1. ​

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