Elastic member module and elastic member

Abstract

An elastic member module according to an embodiment includes an elastic member and a frame, in which the elastic member and the frame are connected by a bridge portion, the elastic member including a cut region including a first pattern, a second pattern, and a joint portion between the first pattern and the second pattern, the first pattern and the second pattern are formed in a concave shape with respect to an outer surface of the elastic member, and the joint portion is connected to the bridge portion.

Description

Technical Field

[0001] The embodiment relates to an elastic member module and an elastic member. Background Art

[0002] Recently, the demand for a foldable display device capable of displaying an image on a large screen is increasing.

[0003] The foldable display is folded or partially bent when carried. In addition, the foldable display is unfolded when displaying an image. This increases the image display area and facilitates portability for the user.

[0004] The foldable display device repeats the recovery process of folding or bending and then unfolding again.

[0005] Therefore, the foldable display device includes an elastic member capable of folding.

[0006] The elastic member includes a folding area and a non-folding area. The elastic member can be bent before being applied to the display device. Therefore, the elastic member is combined with the frame and stored. When the elastic member is applied to the display device, the elastic member is separated from the frame.

[0007] The elastic member includes a bridge portion. The bridge portion is connected to the frame. When the elastic member and the frame are cut, the bridge portion is cut. At this time, a part of the bridge portion may remain. The remaining area of the bridge portion protrudes outward from the elastic member. Therefore, stability problems may occur when operating the elastic member. In addition, the border area of the elastic member increases.

[0008] Therefore, a new elastic member structure capable of solving the above problems is needed. Summary of the Invention

[0009] Technical Problem

[0010] The embodiment provides an elastic member capable of improving the stability of the user.

[0011] The embodiment provides an elastic member having a reduced border area.

[0012] Technical Solution

[0013] The elastic member module according to the embodiment includes an elastic member and a frame, wherein the elastic member and the frame are connected by a bridge portion, the elastic member includes a cutting area, the cutting area includes a first concave portion, a second concave portion, and a connecting portion located between the first concave portion and the second concave portion, the first concave portion and the second concave portion are formed in a concave shape with respect to the outer surface of the elastic member, and the connecting portion is connected to the bridge portion.

[0014] Advantageous Effects

[0015] The elastic member module according to an embodiment includes a pattern connected to a connection part.

[0016] The pattern is formed in a recessed shape with respect to the outer surface of the elastic member. Accordingly, a bridging part can be cut inside the outer surface of the elastic member.

[0017] Accordingly, a cut surface of the bridging part is provided inside the outer surface of the elastic member.

[0018] Accordingly, the cut surface of the elastic member does not protrude beyond the outer surface of the elastic member.

[0019] Accordingly, a safety accident caused by a remaining protruding area after cutting the bridging part can be prevented.

[0020] In addition, since the protruding part is removed, the size of the border area of the elastic member is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of a display device according to an embodiment.

[0022] Figure 2 is a perspective view of an elastic member according to an embodiment.

[0023] Figure 3 is a side view of the elastic member before folding according to an embodiment.

[0024] Figure 4 is a side view of the elastic member after folding according to an embodiment.

[0025] Figure 5 is a plan view of an elastic member module including an elastic member according to an embodiment.

[0026] Figure 6 is Figure 5 an enlarged view of region A of

[0027] Figure 7 is a view showing Figure 5 the cutting line of the elastic member and the bridging part in the enlarged view of region A of

[0028] Figure 8 and Figure 9 is a view showing the elastic member after the bridging part is cut in the enlarged view of region A of Figure 5 is

[0029] Figure 10 and Figure 11 is a top view of an elastic member according to an embodiment.

[0030] Figure 12 is Figure 5 another enlarged view of region A of

[0031] Figure 13 is a cross-sectional view taken along line B-B’ Figure 12 as shown.

[0032] Figure 14 is a view showing a bridging portion cut in an overlapping region Figure 13 as shown.

[0033] Figure 15 and Figure 16 are top views of elastic members according to the second embodiment.

[0034] Figure 17 are top views of elastic members according to the third embodiment.

[0035] Figure 18 is a top view of an elastic member module in which an elastic member and a frame are combined according to the third embodiment.

[0036] Figures 19 to 21 is a view for explaining the reliability of an elastic member regarding the positions of protrusions according to an embodiment and a comparative example.

[0037] Figures 22 to 25 are top views of elastic members according to another embodiment of the third embodiment.

[0038] Figure 26 is a cross-sectional view of a folding support portion including an elastic member according to an embodiment.

[0039] Figure 27 is a cross-sectional view of a display device including a flexible support portion according to an embodiment.

[0040] Figure 28 is a view for explaining an application example of a display device according to an embodiment. DETAILED DESCRIPTION

[0041] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, the spirit and scope of the present disclosure are not limited to a part of the described embodiments, and can be implemented in various other forms, and within the spirit and scope of the present disclosure, one or more elements of the embodiments can be selectively combined and rearranged.

[0042] In addition, unless otherwise clearly defined and described, terms (including technical terms and scientific terms) used in the embodiments of the present disclosure can be interpreted as having the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure pertains, and for example, those terms defined in a commonly used dictionary can be interpreted as having a meaning consistent with their meaning in the context of the relevant field.

[0043] In addition, the terms used in the embodiments of the present disclosure are used to describe the embodiments and are not intended to limit the present disclosure. In this specification, unless specifically stated in a phrase, 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 in which A, B, and C can be combined.

[0044] In addition, when describing the elements of the embodiments of the present disclosure, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish an element from another element, and these terms are not limited to the nature, order, or sequence of the elements.

[0045] In addition, when an element is described as being "connected", "coupled", or "contacted" to another element, it may include not only the case where the element is directly "connected", "coupled", or "contacted" to the other element, but also the case where the element is "connected", "coupled", or "contacted" to the other element through another element between the element and the other element.

[0046] In addition, when described as being "on (above)" or "under (below)" each element, "on (above)" or "under (below)" may include not only the case where two elements are directly connected to each other, but also the case where one or more other elements are formed or disposed between the two elements.

[0047] Hereinafter, an elastic member, a folding support portion, and a display device according to an embodiment will be described with reference to the drawings.

[0048] Figure 1 is a perspective view of a display device according to an embodiment. Figures 2 to 4 is a perspective view and a cross-sectional view of an elastic member according to an embodiment.

[0049] Referring to Figure 1 , the display device 10 may include an elastic member 100, a display panel 2000, and a touch panel 3000 disposed on the elastic member 100.

[0050] The elastic member 100 supports the display panel 2000 and the touch panel 3000. That is, the elastic member 100 may be a support substrate.

[0051] The touch panel 3000 and the display panel 2000 may be integrally formed. For example, the touch panel 3000 may be integrally formed with the display panel 2000 in a manner of being disposed on the display panel (on-cell) or in a manner of being disposed inside the display panel (in-cell).

[0052] The elastic member 100 may include a metallic material and a non-metallic material. Specifically, the elastic member 100 may be formed of multiple layers. The multiple layers may include at least one of a metallic material and a non-metallic material. For example, the elastic member 100 may include metal, metal alloy, plastic, composite material (e.g., carbon fiber reinforced plastic, magnetic material or conductive material, glass fiber reinforced material), ceramic, sapphire or glass.

[0053] The elastic member 100 may be flexible or foldable. That is, the elastic member 100 may be bent in one direction. That is, the elastic member 100 may be a display substrate applied to a flexible display device or a foldable display device.

[0054] The elastic member 100 is defined with a first direction 1D and a second direction 2D. For example, the first direction 1D may be the folding axis direction of the elastic member 100. The second direction 2D may be perpendicular to the first direction.

[0055] One of the first direction 1D and the second direction 2D is the width direction of the elastic member 100, and the other direction is the length direction of the elastic member 100.

[0056] The elastic member 100 is folded with the first direction 1D or the second direction 2D as the folding axis.

[0057] Hereinafter, the first direction 1D is defined as the folding axis direction. In addition, the first direction is defined as the width direction of the elastic member 100. In addition, the second direction is defined as the length direction of the elastic member 100.

[0058] The elastic member 100 may include at least two regions. Specifically, the elastic member 100 includes a first region 1A and a second region 2A.

[0059] The first region 1A is the region where the elastic member 100 is folded. In addition, the second region 2A is the region where the elastic member 100 is not folded. That is, the first region 1A is the folding region, and the second region 2A is the non-folding region.

[0060] The display panel 2000 is disposed on the elastic member 100.

[0061] The display panel 2000 may include a plurality of pixels, and the plurality of pixels include switching thin film transistors, driving thin film transistors, capacitors, and organic light emitting diodes (OLEDs).

[0062] The touch panel 3000 is disposed on the display panel 2000. The display device has a touch function through the touch panel 3000. A display device that only displays images may omit the touch panel.

[0063] The touch panel 3000 includes a substrate and touch electrodes provided on the substrate. The touch electrodes are driven by a capacitive method or a resistive film method.

[0064] When the touch panel 3000 is integrally formed with the display panel 2000, the thickness of the display device can be reduced.

[0065] The elastic member 100 and the display panel 2000 may have different sizes.

[0066] For example, the area of the elastic member 100 may be 90% to 110% of the area of the display panel 2000. Specifically, the area of the elastic member 100 may be 95% to 105% of the area of the display panel 2000. More specifically, the area of the elastic member 100 may be 97% to 100% of the area of the display panel 2000.

[0067] If the area of the elastic member 100 is less than 90% of the area of the display panel 2000, the supporting force of the elastic member 100 is reduced. Therefore, curling may occur in the non-folded area of the elastic member 100.

[0068] In addition, if the area of the elastic member 100 exceeds 110% of the area of the display panel 2000, the border area of the display device increases.

[0069] Although not shown in the figure, the display device may further include a cover window. The cover window is provided on the touch panel 3000. Alternatively, when the touch panel is omitted, the cover window is provided on the display panel 2000. The cover window protects the display device.

[0070] The elastic member 100, the display panel 2000, and the touch panel 3000 are joined by an adhesive layer.

[0071] As described above, the display device includes the elastic member 100.

[0072] Referring to Figures 2 to 4 , the elastic member 100 can be bent in one direction.

[0073] The elastic member 100 includes a first surface 1S and a second surface 2S. The first surface 1S and the second surface 2S are opposite surfaces. The elastic member 100 can be bent such that the first surfaces 1S face each other. That is, the elastic member 100 can be bent such that the surfaces on which the panels are provided face each other. Alternatively, the elastic member 100 can be bent such that the second surfaces 2S face each other. That is, the elastic member 100 can be bent such that the opposite surfaces of the surfaces on which the panels are provided face each other.

[0074] In the following description, as Figure 4As shown, it depicts that the first surface 1S bends in directions facing each other.

[0075] The first region 1A and the second region 2A are regions defined when the elastic member 100 bends.

[0076] Specifically, the first region 1A is a folding region, and the second region is a non - folding region.

[0077] Referring Figure 3 and Figure 4 and, the elastic member 100 includes the first region 1A and the second region 2A.

[0078] For example, the second regions 2A can be formed on the left and right sides of the first region 1A respectively. That is to say, the second regions 2A can be arranged at both ends of the first region 1A. That is to say, the first region 1A can be arranged between the second regions 2A.

[0079] However, the embodiments are not limited thereto, and the first region 1A can be further formed outside the second region 2A.

[0080] The sizes of the first region 1A and the second region 2A can be different. Specifically, the size of the second region 2A is larger than the size of the first region 1A.

[0081] In addition, the area of the first region 1A can be 1% to 30% of the total area of the elastic member 100. Specifically, the area of the first region 1A can be 5% to 20% of the total area of the elastic member 100. The area of the first region 1A can be 10% to 15% of the total area of the elastic member 100.

[0082] If the area of the first region 1A is less than 1% of the total area of the elastic member 100, fractures may occur at the boundary between the folding region and the non - folding region of the elastic member. Therefore, the folding reliability of the elastic member 100 is reduced.

[0083] In addition, if the area of the first region 1A exceeds 30% of the total area of the elastic member 100, curling may occur at the folding region of the display panel 2000.

[0084] Figure 4 is a side view of the folded elastic member.

[0085] Referring Figure 4 and, the elastic member 100 folds in one direction around the folding axis FAX. Specifically, the elastic member 100 folds in the direction where the first surfaces 1S face each other along the folding axis FAX.

[0086] Therefore, the elastic member 100 may be formed with a first region 1A and a second region 2A. That is to say, the elastic member 100 may be formed with a folding region and a non-folding region.

[0087] The folding region is the region where the curvature (R) is formed. The non-folding region is the region where the curvature (R) is not formed. Alternatively, the non-folding region is the region where the curvature approaches 0.

[0088] Referring to Figure 3 and Figure 4 , the elastic member 100 may be folded in one direction and may be formed in the order of a non-folding region, a folding region, and a non-folding region.

[0089] In at least one of the first region 1A and the second region 2A, a plurality of pattern portions may be formed. The pattern portions reduce and disperse the stress generated when the elastic member 100 is folded. The pattern portions will be described in detail below.

[0090] Figure 4 It is shown that the curvature decreases as it extends from the center of the folding axis. However, the embodiments are not limited thereto. For example, the curvature may decrease and increase as it extends from the center of the folding axis. That is to say, the curvature may decrease and then increase as it extends from the center of the folding axis. Alternatively, the curvature may decrease and then increase as it extends from the center of the folding axis, and then decrease again. That is to say, the folding shape of the elastic member 100 may be formed into various shapes other than the U shape.

[0091] The elastic member 100 has a thin thickness. Therefore, the elastic member 100 may be bent in one direction. Therefore, the elastic member is combined with the frame 200 before being applied to the display device. That is to say, the elastic member module 1000 in which the elastic member 100 and the frame 200 are combined is manufactured. When the elastic member 100 is applied to the display device, the elastic member 100 is separated from the frame 200.

[0092] Figure 5 is a plan view of the elastic member module 1000.

[0093] Referring to Figure 5 , the elastic member module 1000 includes an elastic member 100, a frame 200, and a bridging portion BR. The elastic member 100 and the frame 200 are connected by the bridging portion BR. Specifically, the elastic member 100 and the frame 200 are separated by the hole H. In addition, the elastic member 100 and the frame 200 are connected by the bridging portion BR.

[0094] The elastic member 100 and the frame 200 may be made of the same material. The elastic member 100 and the frame 200 are distinguished by the bridging portion BR.

[0095] The bridging part BR is provided outside the elastic member 100. Specifically, a plurality of bridging parts BR are provided at the edge of the elastic member 100.

[0096] The bridging part BR has a set width and length. The width of the bridging part BR can increase as it extends from the elastic member 100 to the frame 200.

[0097] The bridging part BR is the area where the elastic member 100 and the frame 200 are connected. Additionally, the bridging part BR is the area that separates the elastic member 100 and the frame 200. For example, when a force is applied to one area of the bridging part BR, the bridging part BR is cut, and thus, the elastic member 100 and the frame 200 are separated.

[0098] After separating the elastic member 100, a part of the bridging part BR can remain at the edge of the elastic member 100. That is to say, a part of the bridging part BR can remain in a state of being combined with the elastic member 100.

[0099] Therefore, the remaining part of the bridging part BR protrudes outward from the elastic member 100. Thus, when the user operates the elastic member 100, safety problems may occur due to the remaining part. Additionally, the border area of the elastic member 100 may increase due to the remaining part.

[0100] To solve this problem, the elastic member according to the embodiment changes the cutting area of the bridging part. Thus, the elastic member can remove the remaining part of the bridging part.

[0101] Figures 6 to 9 is a diagram for explaining the elastic member and the bridging part before and after cutting.

[0102] Refer to Figure 6 , the elastic member 100 includes a cutting area CA. The cutting area CA is the area where the elastic member 100 is cut from the bridging part BR.

[0103] The cutting area CA includes a first recess C1, a second recess C2, and a connecting part CP.

[0104] The first recess C1 and the second recess C2 can be formed in a recessed shape relative to the outer surface OS of the elastic member. Specifically, the first recess C1 and the second recess C2 can be formed by etching the outer surface OS into a recessed shape. Therefore, the width of the elastic member in the area including the first recess C1 and the second recess C2 can be smaller than the width of the elastic member in another area.

[0105] The connecting portion CP is provided between the first concave portion C1 and the second concave portion C2. The connecting portion CP is a region of the elastic member 100. The connecting portion CP is adjacent to the first concave portion C1 and the second concave portion C2. Specifically, the connecting portion CP is connected to the first concave portion C1 and the second concave portion C2.

[0106] The connecting portion CP is a region where the elastic member 100 and the bridging portion BR are connected. Therefore, the connecting portion CP and the bridging portion BR can form a boundary region BA.

[0107] The elastic member 100 and the bridging portion BR are cut at the connecting portion CP. Specifically, the elastic member 100 is separated from the bridging portion BR due to the first concave portion C1 and the second concave portion C2.

[0108] Specifically, a space for cutting the connecting portion CP is formed by the first concave portion C1 and the second concave portion C2. This space is used to cut the connecting portion CP.

[0109] The first concave portion C1 and the second concave portion C2 have set dimensions. Specifically, the first concave portion C1 has a first width W1. The second concave portion C2 has a second width W2.

[0110] The first width W1 and the second width W2 can be 30% or less of the width of the cutting region CA. Specifically, the first width W1 and the second width W2 can be 15% to 30%, 18% to 28%, or 23% to 27% of the width of the cutting region CA.

[0111] The first width W1 and the second width W2 can be the same or similar within the above range.

[0112] When the first width W1 and the second width W2 exceed 30% of the width of the cutting region CA, the width of the region where the connecting portion CP and the bridging portion BR are connected decreases. Therefore, the bonding force between the elastic member 100 and the frame 200 decreases. Therefore, when the elastic member 100 is operated, the elastic member 100 and the frame 200 may separate.

[0113] If the first width W1 and the second width W2 are less than 15% of the width of the cutting region CA, the widths of the first width W1 and the second width W2 become too small. Therefore, when cutting the connecting portion CP, regions other than the connecting portion CP may be cut together. Therefore, the reliability of the elastic member 100 may be reduced.

[0114] For example, the first width W1 and the second width W2 can be 0.5 mm or less, 0.4 mm or less, 0.3 mm or less, or 0.2 mm or less.

[0115] The first concave portion C1 has a first height H1. The second concave portion C2 has a second height H2.

[0116] The first height H1 can be less than the first width W1. The second height H2 can be less than the second width W2. Specifically, the first height H1 can be 40% or less of the first width W1. Specifically, the first height H1 can be 20% to 40%, 25% to 35%, or 27% to 33% of the first width W1.

[0117] In addition, the second height H2 can be 20% to 40%, 25% to 35%, or 27% to 33% of the second width W2.

[0118] The first height H1 and the second height H2 can be the same or similar within the above ranges.

[0119] If each of the first height H1 and the second height H2 exceeds 40% of the first width W1 and the second width W2, the sizes of the first recess C1 and the second recess C2 increase. Therefore, the strength of the elastic member may decrease. In addition, the border area of the elastic member may increase.

[0120] In addition, if each of the first height H1 and the second height H2 is less than 20% of the first width W1 and the second width W2, the sizes of the first recess C1 and the second recess C2 decrease. Therefore, the height of the connecting portion CP also decreases. Therefore, the cutting area of the connecting portion CP decreases. Therefore, it is not easy to cut the elastic member and the bridging portion. Or, defects may occur during the cutting process.

[0121] For example, the first height H1 and the second height H2 can be 0.2 mm or less, 0.15 mm or less, or 0.1 mm.

[0122] The connecting portion CP can be cut in each region. Refer to Figure 7 , the connecting portion CP can be cut along the boundary area BA by the first cutting line CL1. Alternatively, the connecting portion CP can be cut by the second cutting line CL2 at the lower part of the boundary area BA.

[0123] Therefore, refer to Figure 8 and Figure 9 , the cutting surface CS of the elastic member 100 can be parallel to the outer surface OS of the elastic member 100 or can have a step SH.

[0124] When the connecting portion CP and the bridging portion BR are cut by the first cutting line CL1, the cutting surface CS and the outer surface OS can be parallel.

[0125] Or, when the connecting portion CP and the bridging portion BR are cut by the second cutting line CL2, the cutting surface CS and the outer surface OS can have a step SH. That is, the cutting surface CS and the outer surface OS can have different heights. Specifically, the height of the cutting surface CS is lower than the height of the outer surface OS. Thus, a step is formed.

[0126] Therefore, when the elastic member and the bridging portion are separated, the protruding region caused by the residual region of the bridging portion is removed. That is, the cutting surface CS is provided parallel to the outer surface of the elastic member or at a lower height. Therefore, it is possible to prevent the residual portion of the bridging portion from protruding outward of the elastic member.

[0127] Therefore, the safety of the user is improved. In addition, it is possible to prevent the border region of the elastic member from increasing due to the protruding region.

[0128] Hereinafter, with reference to Figure 10 and Figure 11 , the elastic member separated from the frame will be described.

[0129] Figure 10 and Figure 11 are top views of the elastic member 100.

[0130] The elastic member 100 includes a first region 1A and a second region 2A. The first region 1A is folded in one direction. In addition, the second region 2A is not folded. Alternatively, a part of the second region 2A may be folded while the other regions may not be folded.

[0131] For example, the second region 2A may include a 2-1 region 2-1A and a 2-2 region 2-2A. Specifically, the 2-1 region 2-1A is a region where a pattern is formed. The 2-2 region 2-2A is a region where no pattern is formed. The 2-1 region 2-1A is a boundary region between the folded region and the non-folded region.

[0132] The widths of the first region 1A and the second region 2A are different. Specifically, the width of the first region 1A is smaller than the width of the second region 2A. The width of the first region 1A is the width in the second direction 2D. For example, the width of the first region 1A may be 15 mm to 30 mm, 18 mm to 27 mm, or 20 mm to 25 mm.

[0133] The elastic member includes a pattern portion having a plurality of patterns. The pattern portion is provided in the first region 1A and the second region 2A. For example, as Figure 10 shown, the pattern portion may be provided only in the first region. Alternatively, as Figure 11 shown, the pattern portion may be provided in both the first region 1A and the second region 2A.

[0134] For example, a first pattern portion PA1 and a second pattern portion PA2 may be provided in the first region 1A. The first pattern portion PA1 includes a plurality of first patterns P1 spaced apart in the first direction. The second pattern portion PA2 includes a plurality of second patterns P2 spaced apart in the first direction.

[0135] The third pattern portion PA3 and the fourth pattern portion PA4 may be provided in the second region 2A. The third pattern portion PA3 includes a plurality of third patterns P3 spaced apart in the first direction. The fourth pattern portion PA4 includes a plurality of fourth patterns P4 spaced apart in the first direction.

[0136] The first pattern portion PA1 and the second pattern portion PA2 are provided in the first region 1A. The third pattern portion PA3 and the fourth pattern portion PA4 are provided in the 2-1 region 2-1A.

[0137] The first pattern portion PA1 is spaced apart in the second direction 2D. Additionally, the second pattern portion PA2 is spaced apart in the second direction 2D. Additionally, the first pattern portion PA1 and the second pattern portion PA2 are spaced apart in the second direction 2D. Additionally, the first pattern portion PA1 and the second pattern portion PA2 are alternately arranged.

[0138] The first pattern P1 and the second pattern P2 face each other in the second direction 2D. For example, the first pattern P1 and the second pattern P2 partially overlap in the second direction 2D. For example, the first pattern P1 and the second pattern P2 are arranged in a zigzag shape.

[0139] However, the embodiment is not limited thereto. The first pattern P1 and the second pattern P2 may completely overlap in the second direction 2D.

[0140] The first pattern P1 and the second pattern P2 are formed by passing through the elastic member 100. For example, the first pattern P1 and the second pattern P2 completely pass through the elastic member 100. Accordingly, the first pattern P1 and the second pattern P2 may be formed in a hole shape. Alternatively, the first pattern P1 and the second pattern P2 partially pass through the elastic member 100. Accordingly, the first pattern P1 and the second pattern P2 may be formed in a groove shape.

[0141] The first pattern portion PA1 and the second pattern portion PA2 reduce and disperse the stress generated by folding. Thus, when the elastic member is folded, deformation of the first region 1A can be prevented.

[0142] The length (the length in the first direction) of at least one of the first pattern P1 and the second pattern P2 may be 2 mm to 5 mm, 3 mm to 4 mm, or 3.3 mm to 3.8 mm. Additionally, the width (the width in the second direction) of at least one of the first pattern P1 and the second pattern P2 may be 0.1 mm to 0.3 mm, 0.15 mm to 0.25 mm, or 0.17 mm to 0.22 mm. Additionally, the first interval (the interval in the first direction) between the first pattern P1 and the second pattern P2 may be 0.1 mm to 0.3 mm, 0.15 mm to 0.25 mm, or 0.17 mm to 0.22 mm. Additionally, the second interval (the interval in the second direction) between the first pattern P1 and the second pattern P2 may be 0.01 mm to 0.2 mm, 0.05 mm to 0.15 mm, or 0.07 mm to 0.12 mm.

[0143] At least one of the plurality of first patterns P1 opens an end region of the elastic member. Specifically, at least one of the first patterns opens an end region of the elastic member facing the first direction 1D.

[0144] The hinge portion HN is formed by the first pattern P1 that opens the end region of the elastic member.

[0145] The elastic member 100 can be easily folded through the hinge portion HN. That is, the hinge portion HN is the point where the folding of the first region 1A starts.

[0146] The first region 1A and the second region 2A are defined by the pattern portions PA1 and PA2. Specifically, the first region 1A is the region from the starting point of the pattern portions PA1 and PA2 to the ending point of the pattern portions PA1 and PA2. Additionally, the second region 2A is the region other than the first region 1A.

[0147] Alternatively, the first region 1A is the region from the first pattern portions PA1 and PA2 among the plurality of pattern portions PA1 and PA2 to the last pattern portions PA1 and PA2. Additionally, the second region 2A is the region other than the first region 1A.

[0148] Alternatively, the first region 1A is the region from the first hinge portion HN to the last hinge portion HN. Additionally, the second region 2A is the region other than the first region 1A.

[0149] The third pattern portion PA3 is spaced apart in the second direction 2D. Additionally, the fourth pattern portion PA4 is spaced apart in the second direction 2D. Additionally, the third pattern portion PA3 and the fourth pattern portion PA4 are spaced apart in the second direction 2D.

[0150] The third pattern P3 and the fourth pattern P4 face each other in the second direction 2D. For example, the third pattern P3 and the fourth pattern P4 partially overlap each other in the second direction 2D.

[0151] The third pattern P3 and the fourth pattern P4 are formed by passing through the elastic member 100. For example, the third pattern P3 and the fourth pattern P4 completely pass through the elastic member 100. Therefore, the third pattern P3 and the fourth pattern P4 can be formed in a hole shape. Alternatively, the third pattern P3 and the fourth pattern P4 partially pass through the elastic member 100. Therefore, the first pattern P3 and the fourth pattern P4 can be formed in a groove shape.

[0152] The size of the third pattern P3 can change as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Specifically, the size of the third pattern P3 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0153] Refer to Figure 11 , the length of the third pattern P3 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Alternatively, the width of the third pattern P3 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Alternatively, the interval between the third patterns P3 can increase as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0154] In addition, the minimum length of the third pattern P3 can be 1.0 mm to 5.0 mm, 1.5 mm to 3.0 mm, or 2.0 mm to 2.5 mm. In addition, the maximum interval between the third patterns P3 can be 0.5 mm to 2.5 mm, 1.0 mm to 2.0 mm, or 1.5 mm to 1.8 mm.

[0155] In addition, the minimum distance between the outermost side of the elastic member 100 and the outermost side of the third pattern P3 can be 1 mm to 10 mm, 2 mm to 8 mm, or 3.5 mm to 7 mm. In addition, the maximum distance between the outermost side of the elastic member 100 and the outermost side of the third pattern P3 can be 5 mm to 20 mm, 6.5 mm to 15 mm, or 8 mm to 9 mm.

[0156] In addition, the width (width in the second direction) of the 2-1 region 2-1A can be 3 mm to 12 mm, 4.5 mm to 10.5 mm, or 6 mm to 8 mm.

[0157] In addition, the size of the fourth pattern P4 can change as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Specifically, the size of the fourth pattern P4 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0158] Referring Figure 11 , the length of the fourth pattern P4 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Alternatively, the width of the fourth pattern P4 can decrease as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Alternatively, the spacing between the fourth patterns P4 can increase as it moves away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0159] In addition, the minimum length of the fourth pattern P4 can be 1.0 mm to 5.0 mm, 1.5 mm to 3.0 mm, or 2.0 mm to 2.5 mm. In addition, the maximum spacing between the fourth patterns P4 can be 0.5 mm to 2.5 mm, 1.0 mm to 2.0 mm, or 1.5 mm to 1.8 mm.

[0160] In addition, the minimum distance between the outermost side of the elastic member 100 and the outermost side of the fourth pattern P4 can be 1 mm to 10 mm, 2 mm to 8 mm, or 3.5 mm to 7 mm. In addition, the maximum distance between the outermost side of the elastic member 100 and the outermost side of the fourth pattern P4 can be 5 mm to 20 mm, 6.5 mm to 15 mm, or 8 mm to 9 mm.

[0161] That is, the third pattern portion PA3 and the fourth pattern portion PA4 can include patterns with different sizes according to their positions. That is, the third pattern portion PA3 and the fourth pattern portion PA4 can include gradient patterns. Therefore, it is possible to prevent the pattern from being recognized at the boundary between the first region 1A and the 2-2 region 2-2A.

[0162] If the third pattern portion PA3 and the fourth pattern portion PA4 do not exist, the boundary region between the first region and the 2-2 region can be recognized from the outside. However, the third pattern portion PA3 and the fourth pattern portion PA4 are provided in the 2-1 region. In addition, the sizes of the third pattern portion PA3 and the fourth pattern portion PA4 change. Therefore, it is possible to prevent the boundary region between the first region and the 2-2 region from being recognized from the outside.

[0163] The elastic member 100 includes a cutting region CA, which is the region where the elastic member 100 and the bridging portion BR are cut.

[0164] The cutting region CA is provided in the second region 2A.

[0165] The cutting area CA has a set size. Specifically, the width of the cutting area CA is greater than the spacing in the first direction between the first pattern and the second pattern in the first area. Additionally, the width of the cutting area CA is less than the lengths of the first pattern and the second pattern.

[0166] Additionally, the width of the cutting area CA is greater than the widths of the first pattern and the second pattern in the first area. Additionally, the width of the cutting area CA is less than the minimum length of the third pattern and the fourth pattern in the 2-1 area.

[0167] Additionally, the width of the cutting area CA can be greater than five times the widths of the first pattern and the second pattern. Additionally, the width of the cutting area CA can be less than the maximum spacing in the second direction between the third pattern and the fourth pattern in the 2-1 area.

[0168] Therefore, the folding characteristics of the elastic member are improved by the cutting area CA. If the width of the cutting area CA is greater than the lengths of the first pattern and the second pattern, the width of the cutting area increases. Thus, in the folding test or the manufacturing process of the elastic member, the area overlapping the first pattern and the second pattern in the first direction 1D can be prevented from folding. Thus, a part of the 2-1 area overlapping the cutting area in the first direction can be not used as a boundary area. Additionally, due to stress concentration caused by rapid folding, the elastic member may be damaged.

[0169] Additionally, if the width of the cutting area CA is less than the spacing between the first pattern and the second pattern in the first direction, the protrusions may be damaged in the folding test or the manufacturing process of the elastic member.

[0170] The cutting area CA includes a cutting surface CS, a first recess C1, and a second recess C2.

[0171] The cutting surface CS is the surface on which the elastic member 100 is cut from the bridging portion BR. Thus, the surface roughness and shape of the cutting surface CS can be different from the surface roughness and shape of the outer surface OS.

[0172] For example, the surface roughness of the cutting surface CS and the surface roughness of the outer surface OS can be different. Specifically, the surface roughness of the cutting surface CS can be greater than the surface roughness of the outer surface OS.

[0173] Additionally, the cutting surface CS can include an inclined surface. Additionally, the cutting surface CS can include a curved surface.

[0174] Additionally, the first recess C1 and the second recess C2 can be recessed with respect to the outer surface OS of the elastic member 100.

[0175] The first recess C1 and the second recess C2 may have set dimensions. Specifically, the first recess C1 has a first width W1. The second recess C2 has a second width W2.

[0176] The first width W1 and the second width W2 may be 30% or less of the width of the cutting area CA. Specifically, the first width W1 and the second width W2 may be 15% to 30%, 18% to 28%, or 23% to 27% of the width of the cutting area CA.

[0177] The first width W1 and the second width W2 may be the same or similar within the above ranges.

[0178] If the first width W1 and the second width W2 exceed 30% of the width of the cutting area CA, the area where the connecting part CP and the bridging part BR are connected is reduced. Therefore, the bonding force between the elastic member 100 and the frame 200 is reduced. Therefore, when the elastic member 100 is operated, the elastic member 100 and the frame 200 may be separated.

[0179] If the first width W1 and the second width W2 are less than 15% of the width of the cutting area CA, the widths of the first width W1 and the second width W2 are reduced. Therefore, when cutting the connecting part CP, an area other than the connecting part CP may be cut. Therefore, the reliability of the elastic member 100 is reduced.

[0180] In addition, the first width W1 and the second width W2 may be less than 1 / 3 times the width of the cutting area. Alternatively, the first width W1 and the second width W2 may be greater than the interval between the first pattern and the second pattern in the first direction. In addition, the first width W1 and the second width W2 may be less than the lengths of the first pattern and the second pattern. Alternatively, the first width W1 and the second width W2 may be greater than the widths of the first pattern and the second pattern. In addition, the first width W1 and the second width W2 may be less than the minimum length of the third pattern and the fourth pattern. Alternatively, the first width W1 and the second width W2 may be greater than the widths of the first pattern and the second pattern. In addition, the first width W1 and the second width W2 may be less than the maximum interval between the third pattern and the fourth pattern in the second direction.

[0181] Therefore, the folding characteristics of the elastic member are improved by the cutting area CA. If the width of the cutting area CA is greater than the lengths of the first pattern and the second pattern, the width of the cutting area becomes larger. Therefore, in the folding test or the manufacturing process of the elastic member, the area overlapping the first pattern and the second pattern in the first direction 1D may not be folded. Therefore, a part of the 2-1 area overlapping the cutting area in the first direction may not be used as a boundary area. In addition, due to stress concentration caused by rapid folding, the elastic member may be damaged.

[0182] In addition, if the width of the cutting region CA is smaller than the interval between the first pattern and the second pattern in the first direction, the protrusions may be damaged during the folding test or the manufacturing process of the elastic member.

[0183] The heights H1 and H2 of the recesses C1 and C2 may be the same as or different from the third height. The third height H3 is the height from the bottom surface BS of the recesses C1 and C2 to the cutting surface. That is, as Figure 10 shown, the heights H1 and H2 of the recesses C1 and C2 may be the same as the third height H3. Alternatively, the heights H1 and H2 of the recesses C1 and C2 may be different from the third height H3.

[0184] Specifically, the first height H1 may be the depth of the recesses C1 and C2. That is, the first height H1 is the distance in the first direction from the innermost sides of the recesses C1 and C2 to the outer surface OS of the elastic member.

[0185] The third height H3 may be less than or equal to the first height H1 and the second height H2. That is, the outer surface OS protrudes more outward from the elastic member than the cutting surface CS. Therefore, the cutting surface CS may be provided in the same plane as the outer surface OS. Alternatively, the cutting surface CS may be provided inside compared to the outer surface OS. That is, the cutting surface CS and the outer surface OS have a step SH. In addition, the cutting surface CS may be provided inside the elastic member compared to the outer surface OS.

[0186] Therefore, when the user operates the elastic member, contact between the user and the cutting surface CS can be prevented. Thus, the safety of the user is improved. In addition, the cutting surface CS does not protrude outward from the outer surface OS. This can prevent an increase in the border area of the elastic member.

[0187] In addition, the first height H1 and the second height H2 may be greater than 0.1 times the interval between the first pattern and the second pattern in the first direction. In addition, the first height H1 and the second height H2 may be less than twice the interval between the first pattern and the second pattern in the second direction. Alternatively, the first height H1 and the second height H2 may be greater than 0.5 times the interval between the first pattern and the second pattern in the first direction. In addition, the first height H1 and the second height H2 may be less than the interval between the first pattern and the second pattern in the second direction.

[0188] Therefore, the folding characteristics are improved. If the first height H1 and the second height H2 are greater than twice the interval between the first pattern and the second pattern in the second direction, the sizes of the first pattern and the second pattern as engraved shapes increase. Therefore, the first pattern and the second pattern can be used as hinge portions. Therefore, folding may occur in an undesired area. Additionally, if the first height H1 and the second height H2 are less than 0.1 times the interval between the first pattern and the second pattern in the first direction, stability problems may occur due to residual protrusions when performing a folding test or manufacturing an elastic member. Additionally, the border area may increase.

[0189] Additionally, the step SH between the cutting surface CS and the outer surface OS can be less than the first height and the second height. Alternatively, the step SH can be greater than 0.1 times the interval between the first pattern and the second pattern in the first direction. Additionally, the step SH can be less than the interval between the first pattern and the second pattern in the second direction. Alternatively, the step SH can be greater than 0.5 times the interval between the first pattern and the second pattern in the first direction. Further, the step SH can be less than 0.7 times the interval between the first pattern and the second pattern in the second direction.

[0190] Therefore, the folding characteristics are improved. If the step SH is greater than the first height and the second height, stability problems may occur due to residual protrusions when performing a folding test or manufacturing an elastic member. Additionally, the border area may increase. Additionally, if the step is less than 0.1 times the interval between the first pattern and the second pattern in the first direction, the sizes of the engraved shapes of the first pattern and the second pattern increase. Therefore, the first pattern and the second pattern can be used as hinge portions. Therefore, folding may occur in an undesired area.

[0191] Hereinafter, reference will be made to Figure 5 、 Figures 12 to 16 to describe an elastic member according to another embodiment. Descriptions that are the same as or similar to those of the foregoing embodiment will be omitted.

[0192] As Figure 5 shown, when a force is applied to an area of the bridging portion BR, the bridging portion BR is cut, and thus, the elastic member 100 is separated from the frame 200.

[0193] To easily cut the bridging portion BR, a cutting area can be set in an area of the bridging portion BR. Then, the cutting area can be etched to a set depth. Therefore, the thickness of the cutting area can be less than the thickness of other areas. That is, the cutting area can be a groove formed in the bridging portion BR.

[0194] Multiple pattern portions may be formed in the elastic member. The pattern portions are formed by a roll-to-roll process. Accordingly, tension may be applied in the longitudinal direction of the elastic member.

[0195] Accordingly, while the width of the groove-shaped cutting region increases, the cutting region may be cut. Accordingly, the elastic member may be separated from the frame before being applied to the display device.

[0196] Refer to Figure 12 , the elastic member 100 and the frame 200 are connected by a bridging portion BR.

[0197] The bridging portion BR includes a cutting region CA. The cutting region CA includes a first groove G1 and a second groove G2. Specifically, the bridging portion BR includes one surface and another surface opposite to the one surface. One surface corresponds to one surface of the elastic member. The other surface corresponds to the other surface of the elastic member.

[0198] The first groove G1 is provided on one surface of the bridging portion BR. That is, the first groove G1 is formed by etching one surface. In addition, the second groove G2 is provided on the other surface of the bridging portion BR. That is, the second groove G2 is formed by etching the other surface.

[0199] In addition, the cutting region CA includes an overlapping region OA. The overlapping region OA is a region where the first groove G1 and the second groove G2 overlap. Specifically, the first groove G1 and the second groove G2 overlap in the cutting region CA in the first direction 1D. That is, the first groove G1 and the second groove G2 overlap in the cutting region CA in the width direction of the elastic member 100.

[0200] The first groove G1 and the second groove G2 have a set width and height. Specifically, the first groove G1 has a first width W1 and a first height H1. The second groove G2 has a second width W2 and a second height H2.

[0201] At least one of the first width W1 and the second width W2 may be less than the thickness T of the bridging portion BR. Specifically, at least one of the first width W1 and the second width W2 may be 50% or less, 40% or less, or 30% or less of the thickness T of the bridging portion BR. For example, at least one of the first width W1 and the second width W2 may be 25% to 50%, 30% to 45%, or 35% to 40% of the thickness T of the bridging portion BR.

[0202] In addition, the first width W1 and the second width W2 may be the same or similar.

[0203] If at least one of the first width W1 and the second width W2 is less than 25% of the thickness T of the bridging portion BR, the size of the cutting area CA may be reduced. Therefore, the elastic member 100 is not easily separated through the cutting area.

[0204] In addition, if at least one of the first width W1 and the second width W2 exceeds 50% of the thickness T of the bridging portion BR, the size of the cutting area CA may increase. Therefore, due to the increased size of the bridging portion BR, the size of the elastic member module also increases. In addition, the area etched in the bridging portion BR increases. Therefore, the strength of the bridging portion BR may be reduced. Therefore, when the elastic member module is operated, the bridging portion BR may be cut.

[0205] At least one of the first height H1 and the second height H2 may be less than the thickness T of the bridging portion BR. Specifically, at least one of the first height H1 and the second height H2 may be 50% or less, 40% or less, or 30% or less of the thickness T of the bridging portion BR. For example, at least one of the first height H1 and the second height H2 may be 25% to 50%, 30% to 45%, or 35% to 40%.

[0206] In addition, the first height H1 and the second height H2 may be the same or similar.

[0207] If at least one of the first height H1 and the second height H2 is less than 25% of the thickness T of the bridging portion BR, the area not etched by the first groove G1 and the second groove G2 increases. Therefore, a greater force is required to cut the bridging portion BR. Therefore, the elastic member 100 is not easily separated through the cutting area.

[0208] In addition, if at least one of the first height H1 and the second height H2 exceeds 50% of the thickness T of the bridging portion BR, the etched area increases. Therefore, the strength of the bridging portion BR may be reduced. Therefore, when the elastic member module is operated, the bridging portion BR may be cut.

[0209] The height H3 of the overlapping area OA is less than the thickness T of the bridging portion BR. The height H3 of the overlapping area OA can be defined as the maximum height of the overlapping area OA. The height of the overlapping area OA may change when extending in the first direction.

[0210] Specifically, the height H3 of the overlapping area OA may be 25% or less, 20% or less, or 15% or less of the thickness T of the bridging portion BR. For example, the height H3 of the overlapping area OA may be 5% to 25%, 10% to 20%, or 15% to 18%.

[0211] If the height H3 of the overlapping region OA is less than 5% of the thickness T of the bridging portion BR, the first groove G1 and the second groove G2 may be connected during the formation of the first groove G1 and the second groove G2. Accordingly, a hole is formed in the cutting region CA. Accordingly, the strength of the bridging portion BR may be reduced. Accordingly, when the elastic member module is operated, the bridging portion BR may be cut.

[0212] In addition, if the height H3 of the overlapping region OA exceeds 25% of the thickness T of the bridging portion BR, the region remaining without being etched by the first groove G1 and the second groove G2 may increase. Accordingly, a greater force is required to cut the bridging portion BR. Accordingly, the elastic member 100 is not easily separated through the cutting region.

[0213] The spacing P between the first groove G1 and the second groove G2 may be less than the thickness T of the bridging portion BR.

[0214] Specifically, the spacing P between the first groove G1 and the second groove G2 may be 25% or less, 20% or less, or 15% or less of the thickness T of the bridging portion BR. For example, the spacing P between the first groove G1 and the second groove G2 may be 10% to 25% or 15% to 20%.

[0215] If the spacing P between the first groove G1 and the second groove G2 is less than 10% of the thickness T of the bridging portion BR, the first groove G1 and the second groove G2 may be connected during the formation of the first groove G1 and the second groove G2. Accordingly, a hole is formed in the cutting region CA. Accordingly, the strength of the bridging portion BR may be reduced. Accordingly, when the elastic member module is operated, the bridging portion BR may be cut.

[0216] In addition, if the spacing P between the first groove G1 and the second groove G2 exceeds 25% of the thickness T of the bridging portion BR, the height of the overlapping region OA may increase. Accordingly, the bridging portion remaining in the overlapping region OA may increase. Accordingly, a greater force is required to cut the bridging portion BR. Accordingly, the elastic member 100 is not easily separated through the cutting region.

[0217] Refer to Figure 14 , the bridging portion BR is cut in the cutting region CA. Specifically, the bridging portion BR is cut in one region of the cutting region CA. More specifically, the bridging portion BR is cut in the overlapping region OA of the cutting region CA.

[0218] That is to say, the bridging portion BR can be cut in the cutting region having a smaller height.

[0219] The elastic member module according to the embodiment has improved reliability. Specifically, the bridging portion includes a plurality of grooves overlapping each other. Specifically, the bridging portion includes a first groove and a second groove formed on respective surfaces of the bridging portion. In addition, the first groove and the second groove have a set height and width.

[0220] Therefore, the width and height of the first groove and the second groove can be reduced. When forming the pattern portion by a roll-to-roll process, tension is applied. In the region where the first groove and the second groove are formed, the bridging portion can be prevented from being damaged by the tension.

[0221] In addition, when forming the first groove and the second groove, formation of holes in the bridging portion due to errors during the process can be prevented. Therefore, defects of the elastic member module can be avoided.

[0222] In addition, the elastic member can be easily separated from the frame. Specifically, the bridging portion includes a plurality of grooves overlapping each other. The plurality of grooves form an overlapping region. Therefore, the bridging portion includes an overlapping region having a set height.

[0223] Therefore, even if the height and width of the first groove and the second groove are reduced, the bridging portion can be easily cut through the overlapping region. Therefore, the elastic member can be easily separated from the frame.

[0224] Referring to Figure 15 and Figure 16 , the elastic member 100 may include a first region 1A as a folding region and a second region 2A as a non-folding region.

[0225] Referring to Figure 15 , the elastic member 100 includes a plurality of pattern portions PA. For example, the plurality of pattern portions are formed by a roll-to-roll process. As described above, the bridging portion includes a first groove, a second groove, and an overlapping region having set dimensions. Therefore, when forming the pattern portion on the elastic member, separation of the elastic member from the frame can be prevented.

[0226] The elastic member 100 may include a first pattern portion PA1 provided in the first region 1A.

[0227] In addition, referring to Figure 16 , the elastic member 100 may further include a second pattern portion PA2. Specifically, the elastic member 100 may further include a second pattern portion PA2 provided in the second region 2A.

[0228] The elastic member 100 includes a plurality of protrusions PR.

[0229] The protrusions PR are provided in the second region 2A. Specifically, the protrusions PR protrude from the edge of the second region 2A of the elastic member.

[0230] When the elastic member 100 is separated from the frame 200, a protrusion PR is formed. That is to say, the protrusion PR can be a part of the bridging portion. Therefore, the protrusion PF is integrally formed with the elastic member 100.

[0231] The protrusion PR can control the position of the elastic member 100. Specifically, when the elastic member 100 is applied to the display device 10, the position of the elastic member 100 can be controlled by the protrusion PR. That is to say, the elastic member 100 can be aligned by the protrusion PR. That is to say, the protrusion PR can be an alignment mark.

[0232] Therefore, the elastic member 100 does not require a separate alignment mark. Therefore, the process efficiency of manufacturing the elastic member can be improved. In addition, due to the alignment mark, an increase in the invalid area of the elastic member can be prevented.

[0233] The outer surface OS1 of the elastic member and the outer surface OS2 of the protrusion PR can have different characteristics.

[0234] Specifically, the outer surface OS1 of the elastic member and the outer surface OS2 of the protrusion PR can have different surface roughnesses. For example, the surface roughness of the outer surface OS2 of the protrusion PR can be greater than the surface roughness of the outer surface OS1 of the elastic member. The outer surface OS2 of the protrusion PR is the area where the bridging portion is cut. Therefore, the surface roughness of the outer surface OS2 of the protrusion PR can be greater than the surface roughness of the outer surface OS1 of the elastic member. However, the embodiment is not limited thereto. The surface roughness of the outer surface OS2 of the protrusion PR can be less than the surface roughness of the outer surface OS1 of the elastic member.

[0235] In addition, the outer surface OS1 of the elastic member and the outer surface OS2 of the protrusion PR can have different shapes. For example, the outer surface OS1 of the elastic member and the outer surface OS2 of the protrusion PR can have different curvatures.

[0236] Specifically, the curvature of the outer surface OS2 of the protrusion PR can be greater than the curvature of the outer surface OS1 of the elastic member. For example, the outer surface OS2 of the protrusion PR is formed in a curved shape. In addition, the outer surface OS1 of the elastic member is formed in a flat shape. Alternatively, the outer surface OS2 of the protrusion PR is formed in a curved shape with a large curvature. In addition, the outer surface OS1 of the elastic member can be formed in a curved shape with a small curvature.

[0237] In addition, the inclination angle of the outer surface OS1 of the elastic member can be different from the inclination angle of the outer surface OS2 of the protrusion PR. For example, the inclination angle of the outer surface OS1 of the elastic member can be greater than the inclination angle of the outer surface OS2 of the protrusion PR.

[0238] The outer surface OS2 of the protrusion PR is the area where the bridging portion is cut. Therefore, the curvature or tilt angle of the outer surface OS2 of the protrusion PR can be greater than the curvature or tilt angle of the outer surface OS1 of the elastic member.

[0239] Therefore, the position of the protrusion can be easily confirmed. Multiple protrusions can have different sizes. A protrusion with a small size may be difficult to distinguish from the outer surface of the edge of the elastic member.

[0240] Therefore, the surface roughness or shape of the outer surface OS1 of the elastic member and the outer surface OS2 of the protrusion PR are formed differently. Therefore, even if the size of the protrusion is reduced, the position of the protrusion can be easily confirmed. Therefore, through the protrusion, the position of the elastic member is easily aligned.

[0241] Hereinafter, reference will be made to Figures 17 to 25 Describe an elastic member according to another embodiment. Descriptions that are the same as or similar to those of the foregoing embodiments will be omitted.

[0242] Figure 17 is a top view showing an elastic member according to an embodiment.

[0243] The elastic member 100 includes a plurality of protrusions PR. Specifically, a plurality of protrusions PR are provided at the edge OL of the elastic member 100. The protrusion PR protrudes outward from the edge OL.

[0244] The protrusion PR is formed when the elastic member 100 and the frame 200 are separated.

[0245] Referring to Figure 18 Before being applied to the display device, the elastic member 100 is combined with the frame 200.

[0246] Specifically, the elastic member 100 and the frame 200 are connected by the bridging portion BR while being separated by the hole H. The elastic member 100 and the frame 200 are separated by the cutting area CL of the bridging portion BR.

[0247] The protrusion PR is formed by the remaining bridging portion.

[0248] The protrusion PR is separated from the end portion of the first region 1A. Specifically, the protrusion PR is separated from the outermost first pattern portion PA1 in the second direction 2D. Specifically, the protrusion PR is separated from the outermost hinge portion HN in the second direction 2D.

[0249] The distance G between the protrusion closest to the outermost first pattern portion PA1 and the outermost first pattern portion PA1 has a set size. That is, the distance G between the protrusion closest to the outermost hinge portion HN and the outermost hinge portion HN has a set size.

[0250] The distance G can be greater than 0. That is, the protrusion does not contact the first pattern portion or the hinge portion. The distance G can be 5 mm or less. That is, the distance G can be greater than 0 and less than or equal to 5 mm.

[0251] When the distance G satisfies the above range, the deformation of the pattern portion is reduced. That is, the deformation of the interval between the first pattern portions PA1 can be reduced by the distance G. Alternatively, the deformation of the interval between the second pattern portions PA2 can be reduced by the distance G. Alternatively, the deformation of the interval between the first pattern portion PA1 and the second pattern portion PA can be reduced by the distance G. Alternatively, the deformation of the interval between the first patterns P1 can be reduced by the distance G. Alternatively, the deformation of the interval between the second patterns P2 can be reduced by the distance G. Alternatively, the deformation of the width and length of the first pattern P1 can be reduced by the distance G. Alternatively, the deformation of the width and length of the second pattern P2 can be reduced by the distance G of the protrusion.

[0252] In addition, if the distance G exceeds this range, the deformation of the pattern portion may increase. That is, if the distance G exceeds 5 mm, the deformation of the interval between the first pattern portions PA1, the deformation of the interval between the second pattern portions PA2, the deformation of the interval between the first pattern portion PA1 and the second pattern portion PA, the deformation of the interval between the first patterns P1, the deformation of the interval between the second patterns P2, the width and length of the first pattern P1 or the width and length of the second pattern P2 may increase due to the distance G.

[0253] Alternatively, the distance G can be equal to or greater than the interval between the patterns P1 and P2 in the second direction 2D, and less than or equal to three times the maximum length of the pattern. Alternatively, the distance G can be equal to or greater than the minimum width of the patterns P1 and P2, and less than or equal to twice the maximum length of the pattern. Alternatively, the distance G can be equal to or greater than the interval between the patterns P1 and P2 in the second direction 2D, and less than or equal to the maximum length of the pattern. Alternatively, the distance G can be equal to or greater than twice the interval between the patterns P1 and P2 in the second direction 2D, and less than or equal to ten times the interval between the patterns P1 and P2 in the second direction 2D. Alternatively, the distance G can be equal to or greater than the width of the protrusion PR.

[0254] The protrusion PR is formed by the bridging portion BR. The elastic member 100 and the frame 200 are connected by the bridging portion BR. In addition, the sagging of the elastic member 100 is reduced by the bridging portion BR.

[0255] Specifically, when the elastic member module bends in one direction, the elastic member and the frame also bend in the same direction. The area of the elastic member is larger than that of the frame. Therefore, the elastic member can be bent to a greater extent than the frame. As a result, the first region of the elastic member may droop in one direction. As the drooping increases, the stress applied to the first region increases. In addition, deformation may occur in the pattern portion and the pattern.

[0256] Therefore, the bridging portion and the protruding portion can approach the outermost first pattern portion or the outermost hinge portion with a set size. As a result, the drooping of the first region can be reduced. That is, when the first region droops, the bridging portion can function to fix the first region.

[0257] In addition, the stress generated when the elastic member module bends is effectively dispersed. That is, stress is generated when the elastic member module bends. The stress is transmitted to the frame through the bridging portion. Since the stress is dispersed, stress concentration on one region of the elastic member can be prevented. Therefore, an increase in the waviness of the surface of the elastic member can be prevented. As a result, the surface of the elastic member is flattened.

[0258] In addition, since the bridging portion and the protruding portion are arranged to approach the outermost first pattern portion or the outermost hinge portion with a set size, the number of the bridging portion and the protruding portion provided at the edge of the elastic member in the first direction 1D can be increased.

[0259] The pattern is formed by a roll-to-roll process. Therefore, the elastic member module is wound around a roller in the second direction. As a result, when the roll-to-roll process is performed, tension may be generated in the second direction. The bridging portion may break due to the tension. When a plurality of bridging portions break, the bonding force between the elastic member and the frame decreases. Therefore, the elastic member can be separated from the frame during the pattern formation process. Since the number of the bridging portion and the protruding portion increases, the area where the elastic member and the frame are connected increases. Therefore, separation of the elastic member and the frame during the roll-to-roll process can be prevented.

[0260] Figures 19 to 21 It is a diagram for explaining the deformation of the pattern according to the position of the protruding portion. Figure 19 It is a diagram when the distance G is 5 mm or less. Figure 19 (a) of is a diagram of the folded inner surface. Figure 19 (b) of is a diagram of the folded outer surface. Figure 20 It is a diagram when the distance G is greater than 5 mm and less than or equal to 10 mm. Figure 20 (a) of is a diagram of the folded inner surface. Figure 20 (b) of is a diagram of the folded outer surface. Figure 21 It is a diagram when the distance G is greater than 10 mm. Figure 21 (a) of is a diagram of the folded inner surface. Figure 21Figure (b) is a view of the folded outer surface.

[0261] Referring to Figure 19 , when the elastic member module is bent, the sag of the first region due to the protrusion is small. That is, the protrusion PR functions to fix the first region. Therefore, the sag of the first region is reduced. As a result, the deformation of the pattern portion and the pattern is reduced.

[0262] Referring to Figure 20 , when the elastic member module is bent, the sag of the first region is greater than Figure 19 the sag in

[0263] Referring to Figure 21 , when the elastic member module is bent, the sag of the first region is greater than Figure 19 and Figure 20 the sag in

[0264] Hereinafter, an elastic member according to another embodiment will be described with reference to Figure 22 .

[0265] Referring to Figure 22 , the elastic member 100 includes a first protrusion PR1 and a second protrusion PR2. The first protrusion PR1 is the protrusion closest to the first region 1A. Alternatively, the first protrusion PR1 is the protrusion closest to the outermost first pattern portion PA1. Alternatively, the first protrusion PR1 is the protrusion closest to the outermost hinge portion HN. In addition, the second protrusion PR2 is a protrusion other than the first protrusion PR1.

[0266] The distance G between the first protrusion PR1 and the outermost first pattern portion PA1 or the distance G between the first protrusion PR1 and the outermost hinge portion HN may be greater than 0 and less than or equal to 5 mm.

[0267] The first protrusion PR1 and the second protrusion PR2 have different sizes. Specifically, the length L1-1 of the first protrusion PR1 may be different from the length L1-2 of the second protrusion PR2. Alternatively, the width W1-1 of the first protrusion PR1 may be different from the width WL1-2 of the second protrusion PR2. Alternatively, the length L1-1 of the first protrusion PR1 may be different from the length L1-2 of the second protrusion PR2, and the width W1-1 of the first protrusion PR1 may be different from the width WL1-2 of the second protrusion PR2. Alternatively, the area (L1-1 * W1-1) of the first protrusion PR1 may be different from the area (L1-2 * W1-2) of the second protrusion PR2.

[0268] In addition, the widths of the first protrusion PR1 and the second protrusion PR2 may be less than the length of the first pattern portion PA1 and greater than the width of the first pattern portion PA1. For example, the widths of the first protrusion PR1 and the second protrusion PR2 may be less than the length of the first pattern portion PA1 and greater than two or three times the width of the first pattern portion PA1.

[0269] If the widths of the first protrusion PR1 and the second protrusion PR2 are greater than the length of the first pattern portion PA1, folding failure of the elastic member may occur. In addition, when folding, since the first protrusion having a wider width is adjacent to the hinge portion, the hinge portion adjacent to the first protrusion may be wider than the hinge portion adjacent to the folding axis. Therefore, the width of the hinge portion may vary.

[0270] In addition, if the widths of the first protrusion PR1 and the second protrusion PR2 are less than the width of the first pattern portion PA1, the protrusions may break during the manufacturing process of the elastic member or during the folding test of the elastic member.

[0271] For example, the size of the first protrusion PR1 may be greater than the size of the second protrusion PR2. Specifically, the area of the first protrusion PR1 may be greater than the area of the second protrusion PR2. For example, when forming the bridging portion, the width or length of the bridging portion corresponding to the first protrusion PR1 may be formed to be greater than the width of the bridging portion corresponding to the second protrusion PR2. Therefore, after separating the elastic member from the frame, the area of the first protrusion PR1 may be made greater than the area of the second protrusion PR2.

[0272] Since the area of the first protrusion PR1 is formed to be greater than the area of the second protrusion PR2, the sagging of the first region can be reduced. That is, since the area of the first protrusion PR1 increases, the fixing force of the first protrusion PR1 that fixes the first region can increase. Therefore, since the sagging of the first region is reduced, the deformation of the pattern portion and the pattern can be reduced.

[0273] Reference Figure 23 , the elastic member 100 includes a first protrusion PR1 and a second protrusion PR2. The first protrusion PR1 is a protrusion within a distance of 5 mm from the first region 1A. Alternatively, the first protrusion PR1 is a protrusion within a distance of 5 mm from the outermost first pattern portion PA1. Alternatively, the first protrusion PR1 is a protrusion within a distance of 5 mm from the outermost hinge portion HN. In addition, the second protrusion PR2 is a protrusion other than the first protrusion PR1.

[0274] The first protrusion PR1 includes a plurality of protrusions. For example, the first protrusion PR1 includes a 1-1 protrusion PR1-1 and a 1-2 protrusion PR1-2. Specifically, a plurality of protrusions within a distance of 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN may be provided. In Figure 23 , two protrusions are shown. However, this embodiment is not limited thereto, and three or more protrusions may be provided.

[0275] Since a plurality of protrusions within a distance of 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN are provided, deformation of the interval between the first pattern portions PA1, deformation of the interval between the second pattern portions PA2, deformation of the interval between the first pattern portion PA1 and the second pattern portion PA, deformation of the interval between the first patterns P1, deformation of the interval between the second patterns P2, deformation of the width and length of the first pattern P1, and deformation of the width and length of the second pattern P2 can be reduced.

[0276] Specifically, sagging of the first region can be reduced. That is, since the fixing force based on the protrusions is increased, when the first region sags, the first region can be effectively fixed.

[0277] In addition, a plurality of protrusions may be provided at different intervals. Specifically, the interval between the protrusions within a distance of 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN may be different from the interval between the protrusions at a distance greater than 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Specifically, the interval between the protrusions within a distance of 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN may be smaller than the interval between the protrusions at a distance greater than 5 mm from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0278] For example, the interval D1 between the first protrusion PR1-1 and the first protrusion PR1-2 can be smaller than the interval D2 between the second protrusions PR2. Additionally, the interval D1 between the first protrusion PR1-1 and the first protrusion PR1-2 can be smaller than the interval D3 between the first protrusion PR1-2 and the second protrusion PR2.

[0279] That is to say, the interval between the protrusions can increase as the protrusions move away from the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. In other words, the interval between the protrusions can decrease as the protrusions move closer to the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN.

[0280] Therefore, when forming the pattern through a roll-to-roll process, separation of the elastic member from the frame can be prevented. Specifically, when forming the pattern portion in the first region of the elastic member, a force for etching is applied to the elastic member. As a result, the elastic member and the frame can be separated during the pattern formation process. Therefore, in the region adjacent to the region where the pattern portion is formed, the interval between the bridging portion and the protrusion is made smaller. Therefore, when forming the pattern in the elastic member, separation of the elastic member from the frame can be prevented.

[0281] Referring to Figure 24 and Figure 25 , the elastic member can include a plurality of pattern portions. Specifically, pattern portions including a plurality of patterns can be provided in the first region 1A and the second region 2A.

[0282] The protrusion PR includes a first protrusion PR1 and a second protrusion PR2. The first protrusion PR1 is the protrusion closest to the first region 1A, the outermost first pattern portion PA1, or the outermost hinge portion HN. Additionally, the second protrusion PR2 is the protrusion other than the first protrusion PR1.

[0283] The first protrusion PR1 can overlap with the 2-1 region 2-1A. Specifically, the first protrusion PR1 can overlap with the 2-1 region 2-1A in the first direction 1D.

[0284] In addition, the second protrusion PR2 may not overlap with the 2-1 region 2-1A. Specifically, the second protrusion PR2 does not overlap with the 2-1 region 2-1A in the first direction 1D. Since the first protrusion PR1 is arranged to overlap with the 2-1 region 2-1A, the area of the 2-1 region 2-1A can be aligned. For example, the area of the 2-1 region 2-1A can be set based on the position of the first protrusion PR1. Therefore, it is possible to prevent the strength of the elastic member from decreasing due to an increase in the area of the 2-1 region 2-1A. In addition, it is possible to prevent the boundary between the first region and the second region from being recognized due to a decrease in the area of the 2-1 region 2-1A.

[0285] In addition, since the first protrusion PR1 overlaps with the 2-1 region 2-1A, the area(s) of the 2-1 region 2-1A can be made similar. Specifically, the areas of the 2-1 regions 2-1A provided on the left and right sides of the first region can be controlled based on the position of the first protrusion PR1. Therefore, the area of the 2-1 region 2-1A can be made uniform. As a result, it is possible to prevent the aperture ratio of the elastic member 100 from being different in one region of the elastic member. Therefore, it is possible to prevent the elastic member from bending in one direction due to a difference in the strength of the elastic member.

[0286] In addition, referring to Figure 25 , the distance ds1 between the first protrusions PR1 at both ends of the first region may be smaller than the distance between other protrusions. Specifically, the distance ds1 between the first protrusions PR1 facing each other in the second direction 2D may be smaller than the distance ds2 between the first protrusion PR1 and the second protrusion PR2 facing each other in the second direction 2D. In addition, the distance ds1 between the first protrusions PR1 facing each other in the second direction 2D may be smaller than the distance ds3 between the second protrusions PR2 facing each other in the second direction 2D. Therefore, sagging can be reduced.

[0287] In addition, the first protrusion PR1 overlaps with the 2-1 region 2-1A in the first direction 1D. Specifically, the distance from the folding axis FAX to the second protrusion PR1 is smaller than the distance from the folding axis FAX to the outermost pattern of the 2-1 region 2-1A. In addition, the distance from the folding axis FAX to the second protrusion PR1 may be greater than the distance from the folding axis FAX to the outermost pattern of the first region 1A.

[0288] In addition, the edge region (E) of the elastic member may include a curved surface. Further, the distance between the edge region (E) and the second protrusion PR2 closest to the edge region (E) in the first direction 1D may be less than the distance between the edge region (E) and the second protrusion PR2 closest to the edge region (E) in the second direction 2D. Accordingly, when the elastic member is folded, the edge region may prevent sagging compared to the frame. Thus, wear on the edge region during the manufacturing process or folding test of the elastic member can be prevented.

[0289] Hereinafter, a folding support part including an elastic member according to the above-described embodiment will be described with reference to Figure 26 the same.

[0290] Referring to Figure 26 , the folding support part may include an elastic member 100, a planarization layer 200, an adhesive layer 300, and a protective layer 400.

[0291] The planarization layer 200 may be disposed on the elastic member 100 to planarize the surface of the elastic member 100. As described above, a plurality of pattern parts in the shape of holes or grooves are formed in the elastic member 100, and due to the pattern parts, the surface of the elastic member 100 may not be flat. Accordingly, when a panel or the like is directly bonded to the elastic member 100, the bonding strength with the panel may be reduced due to the surface characteristics of the elastic member 100.

[0292] Therefore, the planarization layer 200 may be disposed on the elastic member 100 to planarize the bonding surface where the elastic member 100 is bonded to the panel.

[0293] The planarization layer 200 may include a metal or a non-metal. Specifically, the planarization layer 200 may include a metal or a plastic.

[0294] The adhesive layer 300 may be disposed between the elastic member 100 and the planarization layer 200. The adhesive layer 300 may be disposed between the elastic member 100 and the planarization layer 200 to bond the elastic member 100 and the planarization layer 200.

[0295] For example, the adhesive layer 300 may include a pressure-sensitive adhesive (PSA), but the embodiment is not limited thereto.

[0296] The protective layer 400 may be disposed below the elastic member 100.

[0297] The protective layer 400 may have a color. For example, the protective layer 400 may be formed black.

[0298] The protective layer 400 may include metal particles. For example, the protective layer 400 may include copper particles. Accordingly, the thermal conductivity of the protective layer 400 can be improved, and thus heat generated in the display device can be dissipated through the protective layer 400.

[0299] In the following, reference will be made to Figure 27 to describe a display device including a folding support unit according to the above-described embodiment.

[0300] Referring to Figure 27 , the display device 10 may include a folding support unit and a panel.

[0301] The display device 10 may include a folding support unit and a panel layer 600 disposed on the folding support unit and including a display panel and / or a touch panel.

[0302] An adhesive layer 500 is disposed between the elastic member 100 and the panel layer 600, and the elastic member 100 and the panel layer 600 may be joined through the adhesive layer 500.

[0303] As described above, since the elastic member 100 can be joined to the joining surface of the elastic member through the planarization layer 200, the elastic member and the panel layer can be stably joined without the influence of steps.

[0304] The adhesive layer 500 between the elastic member 100 and the panel layer 600 may have characteristics different from those of the third layer 300 of the elastic member 100.

[0305] Specifically, the adhesive layer 500 may have a thickness smaller than that of the third layer 300. For example, the thickness of the adhesive layer 500 may be 5 μm to 15 μm.

[0306] Figure 28 is a diagram for explaining an example of applying an elastic member according to an embodiment.

[0307] Referring to Figure 28 , the elastic member according to an embodiment may be applied to a flexible display device or a foldable display device for displaying on a display.

[0308] For example, the elastic member according to an embodiment may be applied to a flexible display device such as a mobile phone or a tablet computer.

[0309] Such an elastic member may be applied to a flexible, bendable or foldable flexible display device, such as a mobile phone or a tablet computer.

[0310] The elastic member may be applied to a flexible, bendable or foldable flexible display device, such as a mobile phone or a tablet computer, and may improve the folding reliability of a display device for repeated folding or restoration, thereby improving the reliability of the flexible display device.

[0311] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present disclosure, but are not limited to only one embodiment. In addition, those skilled in the art can combine or modify the features, structures, and effects shown in each embodiment for other embodiments. Therefore, it should be understood that such combinations and modifications are included within the scope of the present invention.

[0312] In addition, the embodiments have been mainly described above, but the embodiments are only examples and do not limit the present disclosure, and those skilled in the art can understand that several changes and applications not shown above can be made without departing from the essential characteristics of the embodiments. For example, the various components specifically shown in the embodiments can be changed. In addition, it should be understood that the differences related to such changes and such applications are included within the scope of the present invention defined in the appended claims.

Claims

1. An elastic member module, comprising: An elastic member and a frame, wherein, the elastic member and the frame are connected by a bridging portion, wherein, the elastic member includes a cutting area, wherein, the cutting area includes a first recess, a second recess, and a connecting portion between the first recess and the second recess, wherein, the first recess and the second recess are formed as concave shapes relative to the outer surface of the elastic member, and wherein, the connecting portion is connected to the bridging portion.

2. The elastic member module according to claim 1, wherein The widths of the first recess and the second recess are 15% to 30% of the total width of the cutting area.

3. The resilient member module according to claim 2, wherein, The heights of the first recess and the second recess are 20% to 40% of the width of the recess.

4. An elastic member includes a first region and a second region, wherein, The elastic member has a first direction defined as the width direction of the elastic member and a second direction defined as the length direction of the elastic member, wherein, the elastic member includes a cutting area, wherein, the cutting area includes a cutting surface and a recess including a first recess and a second recess, wherein, the first recess and the second recess are formed as concave shapes relative to the outer surface of the elastic member, wherein, a first height from the bottom surface of the recess to the outer surface of the elastic member and a third height from the bottom surface of the recess to the cutting surface are defined, and wherein, the third height is less than or equal to the first height.

5. The elastic member according to claim 4, wherein, The cutting area is provided in the second area.

6. The elastic member according to claim 4, wherein, The surface roughness of the cutting surface is greater than the surface roughness of the outer surface of the elastic member.

7. The elastic member according to claim 4, wherein, The cutting surface includes a curved surface or an inclined surface.

8. The resilient member according to claim 4, wherein, The widths of the first recess and the second recess are 15% to 30% of the total width of the cutting area.

9. An elastic member module, comprising: An elastic member and a frame, wherein, the elastic member and the frame are connected by a bridging portion, wherein, the bridging portion includes a cutting area, wherein, the cutting area includes a first groove formed on one surface of the bridging portion and a second groove formed on the other surface of the bridging portion opposite to the one surface, wherein, the cutting area includes an overlapping area where the first groove and the second groove partially overlap in the width direction of the elastic member, and wherein, the height of the overlapping area is 5% to 25% of the thickness of the bridging portion.

10. An elastic member includes a first region and a second region, wherein, The elastic member includes a first direction as the width direction and a second direction as the length direction, wherein, the first area includes: a plurality of first pattern portions, the plurality of first pattern portions including a plurality of first patterns spaced apart from each other in the first direction; and a plurality of second pattern portions, the plurality of second pattern portions including a plurality of second patterns spaced apart from each other in the first direction, wherein, the plurality of first pattern portions and the plurality of second pattern portions are alternately arranged, wherein, the first pattern provided at the end in the first direction among the plurality of first patterns includes a hinge portion provided to open one side end region, and wherein, a plurality of protrusions are provided on the outermost side of the elastic member, and Among them, the distance between the protrusion closest to the outermost hinge portion among the multiple protrusions and the outermost hinge portion is greater than 0 and less than or equal to 5 mm.

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