Patent Publication Number: US-11664390-B2

Title: Flexible electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of application Ser. No. 16/390,402, filed on Apr. 22, 2019, which claims priority to U.S. Provisional Patent Application No. 62/673,212, filed on May 18, 2018, and China Patent Application No. 201811196586.8 filed on Oct. 15, 2018, which are incorporated by reference herein in their entirety. 
    
    
     BACKGROUND 
     Field 
     The disclosure relates to an electronic device, and more particularly to a flexible electronic device. 
     Description of the Related Art 
     In general, a display area is surrounded by a frame area without a display function, and driving elements and wiring layers are disposed in the frame area. However, the frame area will limit the available space of a screen, so it is desired to minimize the frame area to achieve the greatest screen space. Furthermore, conventional flexible electronic devices also have a problem wherein wiring in the electronic devices may break if the flexible electronic device is bent too many times or the radius of curvature of the flexible electronic device during bending is too low, which reduces the reliability of the conventional flexible electronic devices. 
     SUMMARY 
     The present disclosure is related to an electronic device with a display area and a non-display area. The electronic device includes a supporting substrate, a flexible substrate, a first organic insulating layer, a first conductive layer, a second conductive layer, a second organic insulating layer, and a resilient structure. The flexible substrate is disposed on the supporting substrate. The first organic insulating layer is disposed on the flexible substrate. The first conductive layer is disposed on the first organic insulating layer. The second conductive layer is disposed on the first conductive layer. The second organic insulating layer is disposed on the second conductive layer. The resilient structure includes resilient elements disposed between the first conductive layer and the second conductive layer. The first organic insulating layer, the second organic insulating layer, the first conductive layer, the second conductive layer and the resilient structure are disposed on the non-display area, and the first conductive layer alternately contacts the second conductive layer and the resilient elements. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion, 
         FIG.  1    is a schematic view of an electronic device according to an embodiment of the present disclosure. 
         FIG.  2 A  is a schematic view of an electronic device under a bending condition according to an embodiment of the present disclosure, 
         FIG.  2 B  is a schematic view of an electronic device under another bending condition according to an embodiment of the present disclosure. 
         FIG.  3 A  is a cross-sectional view of an electronic device according to an embodiment of the present disclosure. 
         FIG.  3 B  is an enlarged view of an area indicated by a dashed line in  FIG.  3 A . 
         FIG.  3 C  is a cross-sectional view of the electronic device in  FIG.  3 A  while being bent in the same way as in  FIG.  2 A . 
         FIG.  3 D  is a cross-sectional view of the electronic device in  FIG.  3 A  while being bent in the same way as in  FIG.  2 B . 
         FIG.  4 A  is a cross-sectional view of an electronic device according to another embodiment of the present disclosure. 
         FIG.  4 B  is a cross-sectional view of the electronic device in  FIG.  4 A  while being bent in the same way as in  FIG.  2 A . 
         FIG.  4 C  is a cross-sectional view of the electronic device in  FIG.  4 A  while being bent in the same way as in  FIG.  2 B . 
         FIGS.  5 A- 5 C  are schematic views showing the position relationships between conductive structures and resilient elements according to some embodiments of the present disclosure. 
         FIG.  6    is a flow diagram of manufacturing the electronic device according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. 
     In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Moreover, the formation of a feature on, connected to, and/or coupled to another feature in the present disclosure that follows may include embodiments in which the features are formed in direct contact, and may also include embodiments in which additional features may be formed interposing the features, that the features may not be in direct contact. In addition, spatially relative terms, for example, “vertical,” “above,” “over,” “below,”, “bottom,” etc. as well as derivatives thereof (e.g., “downwardly,” “upwardly,” etc.) are used for ease of the present disclosure of one features relationship to another feature. The spatially relative terms are intended to cover different orientations of the device including the features. 
       FIG.  1    is a schematic view of an electronic device  1  according to an embodiment of the present disclosure. In this embodiment, the electronic device  1  includes a display area  2  and a non-display area  3 . The non-display area  3  includes a bending area  4  and a wiring area  5 , wherein the border between the display area  2  and the bending area  4  and the border between the bending area  4  and the wiring area  5  may be further defined later. In this embodiment, a wiring W is disposed on the wiring area  5  for connecting to other devices (not shown). In some embodiments, the wiring W maybe, but not limited to, chip on film (COF), flexible printed circuit (FPC), or printed circuit hoard (PCB). 
     The electronic device  1  is mainly formed from a supporting substrate  10  and an electronic device C on the supporting substrate  10 . The supporting substrate  10  is disposed in the display area  2 , in the wiring area  5 , and in a portion of the bending area  4 . For example, as shown in  FIG.  1   , there is a portion of the bending area  4  that no supporting substrate  10  is disposed therein. In other words, a portion of the supporting substrate  10  on the bending area  4  is removed. In some embodiments, the supporting substrate  10  is disposed in the display area  2  rather than the wiring area  5 . 
     The electronic device  1  may be, for example, a display device including liquid crystal (LC), organic light-emitting diode (OLED), quantum dot (OD), fluorescent material, phosphor material, light-emitting diode (LED), mini light-emitting diode (Mini LED), micro light-emitting diode (Micro LED) or other display medias, but the present disclosure is not limited there: The electronic device may also be, for example, a sensing device, an antenna, a combination thereof, or a combined electronic device by combining multiple electronic devices. 
       FIG.  2 A  is a schematic view of the electronic device  1  under a bending condition according to an embodiment of the present disclosure. In  FIG.  2 A , the non-display area  3  is bent toward a backside of the display area  2  (a surface adjacent to the supporting substrate  10 ), wherein the bending area  4  of the non-display area  3  is bent to have an arc-liked shape, and a space S is formed between the bending area  4  and the supporting substrate  10 . The supporting substrate  10  on the display area  2  and the wiring area  5  may overlap or contact with each other. As a result, when viewed from a front surface of the display area  2  (a surface away from the supporting substrate  10 ), the wiring area  5  without a display function may be hided at the back side of the display area  2  to increase the area occupied by of the display area  2  or enhance the freedom of wiring, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIG.  2 B  is a schematic view of the electronic device  1  under a bending condition according to another embodiment of the present disclosure. In  FIG.  2 B , the bending area  4  is bent toward a side of the supporting substrate  10  to approach or contact the side of the supporting substrate  10  (as shown by an interface D), an angle between the display area  2  and a portion of the bending area  4  positioned on the side of the supporting substrate  10  is about 90 degrees, and an angle between the wiring area  5  and the portion of the bending area  4  positioned on the side of the supporting substrate  10  is also about 90 degrees. The portions of the supporting substrate  10  on the display area  2  and the wiring area  5  may overlap or contact with each other. As a result, when viewed from a front surface of the display area  2  (the surface away from the supporting substrate  10 ), the wiring area  5  without a display function may be hided at the back side of the display area  2  to increase the area occupied by the display area  2 . Furthermore, because the angle between the display area  2  and a portion of the bending area  4  positioned on the side of the supporting substrate  10  and the angle between the wiring area  5  and the portion of the bending area  4  positioned on the side of the supporting substrate  10  are about 90 degrees, the area occupied by the display area  2  when viewed from the front surface of the display area  2  may be further increased, the freedom of wiring may be enhanced, or the area occupied by the electronic device C at a gap formed during combination may be reduced, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIG.  3 A  is a cross-sectional view of an electronic device  1 A according to an embodiment of the present disclosure. In  FIG.  3 A , the electronic device  1 A includes a supporting substrate  10 , a flexible substrate  20 , a first organic insulating layer  30 , a first conductive layer  40 A, a second conductive layer  50 A, a resilient structure  60 A, a second organic insulating layer  70  and an inorganic insulating layer  80 . 
     The flexible substrate  20  is disposed on the supporting substrate  10 , an opening  12  is formed on the non-display area  3 , wherein the supporting substrate  10  is penetrated by and separated as two portions by the opening  12 . Furthermore, a portion of the flexible substrate  20  is exposed by the opening  12 . In an embodiment, the supporting substrate  10  terminates at the opening  12  and has two sides S 1 , S 2  exposed by the opening  12 , and a space S is formed between the two sides S 1 , S 2  and the flexible substrate  20  when the electronic device  1 A is bent as shown in  FIG.  2 A , In another embodiment, the two sides S 1 , S 2  directly contact the flexible substrate  20  when the electronic device  1 A is bent. In some embodiments, the supporting substrate  10  terminates at the opening  12  and is not separated into two portions by the opening  12 . The first organic insulating layer  30  and the inorganic insulating layer  80  are disposed on the flexible substrate  20 , and the thickness of the first organic insulating layer  30  and the thickness of the inorganic insulating layer  80  are substantially the same. An interface  30 A and an interface  30 B are formed between the first organic insulating layer  30  and the inorganic insulating layer  80 , and the angle formed between the interface  30 A or the interface  30 B to the flexible substrate  20  is θ 1 . In some embodiments of the present disclosure, the angle θ 1  is greater than 90 degrees and less than 180 degrees, but the present disclosure is not limited thereto. The interface  30 A and the interface SOB between the first organic insulating layer  30  and the inorganic insulating layer  80  are the interface between the display area  2  and the bending area  4  and the interface between the bending area  4  and the wiring area  5 , respectively. If the interface  30 A or the interface  30 B is tilted, where the flexible substrate  20  and the interface  30 A or the interface  30 B contacts with each other may act as a border of different areas. The interface  30 A or the interface  30 B between the supporting substrate  10 . In other words, the interface  30 A or the interface  30 B between the first organic insulating layer  30  and the inorganic insulating layer  80  overlaps the supporting substrate  10  when viewed along a direction perpendicular to a surface of the flexible substrate  20 . The chance of the interface  30 A or the interface  30 B being stripped due to withstanding bending stress may be reduced if the interface  30 A or the interface  30 B is moved inwardly a certain distance from the border of the supporting substrate  10  so as to increase the reliability of the electronic device  1 A. Therefore, a distance between two sides S 1 , S 2  of the supporting substrate  10  is less than a distance between the two interfaces  30 A,  30 B. In the present disclosure, the direction perpendicular to the flexible substrate  20  is defined as the normal direction of a surface of the flexible substrate  20 , and other elements are disposed on the surface. 
     The first conductive layer  40 A is disposed on the first organic insulating layer  30  and the inorganic insulating layer  80 , and the second conductive layer  50 A is disposed on the first conductive layer  40 A. The resilient structure  60 A includes a plurality of resilient elements  61 A disposed between the first conductive layer  40 A and the second conductive layer  50 A, and the second organic insulating layer  70  is disposed on the second conductive layer  50 A. The first organic insulating layer  30 , the first conductive layer  40 A, the second conductive layer  50 A, the resilient structure  60 A and the second organic insulating layer  70  are disposed in the non-display area  3 . In this embodiment, the first conductive layer  40 A is electrically connected to an active driving device disposed in the display area  2  or the non-display area  3 . The resilient elements  61 A may include suitable organic materials. 
     The supporting substrate  10  is used for supporting the whole electronic device  1 A and includes suitable transparent materials such as glass, quartz, ceramic, sapphire or plastic, etc., but the present disclosure is not limited thereto. The flexible substrate  20  is deformable to help the electronic device  1 A being bent. The flexible substrate  20  includes suitable flexible materials, such as polycarbonate, polyimide, polypropylene or polyethylene terephthalate, etc. The first organic insulating layer  30  and the second organic insulating layer  70  are used to insulate the first conductive layer  40 A, the second conductive layer  50 A and other elements from external environment, or used to distribute the stress created while being bent. Furthermore, the first organic insulating layer  30  and the second organic insulating layer  70  may include suitable organic materials. The thickness of the first organic insulating layer  30  may be, for example, greater than or equal to 0.5 μm, and less than or equal to 2 μm; and the thickness of the second organic insulating layer  70  may be, for example, greater than or equal to 1 μm, and less than or equal to 9 μm. However, the ranges are merely examples, and the thickness of the first organic insulating layer  30  and the second organic insulating layer  70  are not limited thereto. 
     The materials of the first conductive layer  40 A and the second conductive layer  50 A may include suitable conductive materials, such as conductive metal materials or conductive transparent materials, but the present disclosure is not limited thereto. The metal materials may include suitable metals, such as Cu, Al, Mo, W, Au, Cr, Ni, Pt, Ti, Cu alloy, Al alloy, Mo alloy, W alloy, Au alloy, Cr alloy, Ni alloy, Pt alloy, Ti alloy or the combination thereof, but the present disclosure is not limited thereto. The transparent conductive material may include, for example, indium tin oxide (ITO), indium gallium zinc oxide (IGZO), a combination thereof, other good conductive materials or low resistance materials, but the present disclosure is not limited thereto. 
     In some embodiments, the first conductive layer  40 A or the second conductive layer  50 A may be manufactured using the same photomask or made of the same material as one of the layers of the active driving devices (e.g. switching transistor or driving transistor) or conductive pads. For example, the first conductive layer  40 A and a source or drain uses the same photomask, and the second conductive layer  50 A and a conductive pad uses the same photomask to reduce manufacturing costs, but the present disclosure is not limited thereto. In some embodiments, neither the first conductive layer  40 A nor the second conductive layer  50 A uses the same photomask as the elements in the display area  2 , nor are they manufactured with same materials to the elements in the display area  2 . In some embodiments, either the first conductive layer  40 A or the second conductive layer  50 A is electrically connected to the active driving devices in the display area  2  or in the non-display area  3 . In some embodiments, either the first conductive layer  40 A or the second conductive layer  50 A is electrically connected to the wiring W on the wiring layer  5 . In some embodiments, the self-illuminating display media (not shown) of the electronic device  1 A, such as an LED, is electrically connected to a drain through, for example, a conductive pad or another conductive medium. In some embodiments, the self-illuminating display media or the media for controlling conductance (not shown) of the electronic device  1 A, such as liquid crystal, is controlled by the drain or controlled by an electrode electrically connected to the drain. 
     The thickness of the first conductive layer  40 A and the second conductive layer  50 A may be, for example, greater than or equal to 0.4 μm, and less than or equal to 0.7 μm. The inorganic insulating layer  80  may include suitable insulating materials, such as an inorganic insulating material (e.g. SiO x , SiN x , SiO x N y , etc.) having a higher stiffness than the flexible substrate  20 , but the present disclosure is not limited thereto. In some embodiments, the stiffness comparison is based on the Young&#39;s modulus of the materials. 
     In  FIG.  3 A , the resilient elements  61 A are separated from each other for a distance rather than formed continuously. The distances between two adjacent resilient elements  61 A may be identical or different, and is not limited thereto in the present disclosure. The first conductive layer  40 A contacts the second conductive layer  50 A at intervals, and the first conductive layer  40 A may contact the second conductive layer  50 A directly or indirectly, as long as the first conductive layer  40 A and the second conductive layer  50 A are electrically connected with each other at intervals. The way how the first conductive layer  40 A and the second conductive layer  50 A contacting with each other may be applied to any embodiment of the present disclosure. It should be noted that each of the resilient elements  61 . A have a shape like a polygon, as shown in  FIG.  3 A . In other words, the parts where the first conductive layer  40 A and the second conductive layer  50 A contact the resilient elements  61 A are several bent segments. Furthermore, the first conductive layer  40 A contacts the second conductive layer  50 A and the resilient elements  61 A alternately to bend these structures. The thickness of the resilient structure  60 A may be, for example, greater than or equal to 1 μm, and less than or equal to 4 μm, such as 2 μm or 3 μm. 
     The angle θ 1  formed between the flexible substrate  20  to the interface  30 A or the interface  30 B, which are the interfaces formed between the first organic insulating layer  30  and the inorganic insulating layer  80 , may be, for example, greater than 90 degrees and less than 180 degrees. As a result, the first organic insulating layer  30  may be smoothly connected to the inorganic insulating layer  80  to reduce the stress here. Therefore, the stripping happened between the first organic insulating layer  30  and the inorganic insulating layer  80 , which is caused by large stress, may be prevented. 
     It should be noted that in  FIG.  3 A , the supporting substrate  10  is separated as two portions by the opening  12 , the first conductive layer  40 A extends across the opening  12 , and two ends of the first conductive layer  40 A are disposed on the two portions of the supporting substrate  10 . Furthermore, the second conductive layer  50 A extends across the opening  12 , and two ends of the second conductive layer  50 A are disposed on the two portions of the supporting substrate  10 . As a result, it can be ensured that both of the first conductive layer  40 A and the second conductive layer  50 A extend across the part where the bending area  4  is bent. As a result, even if one of the first conductive layer  40 A or the second conductive layer  50 A is fractured because of being bent during usage, another one of the first conductive layer  40 A or the second conductive layer  50 A can keep transporting electrical signal to enhance the reliability of the electronic device  1 . 
       FIG.  3 B  is an enlarged view of an area indicated by a dashed line in  FIG.  3 A . It should be noted that at least a portion of the second conductive layer  50 A overlaps a portion of the inorganic insulating layer  80  when viewed along a direction perpendicular to a surface of the flexible substrate  20 . As a result, the area where the second conductive layer  50 A overlaps the inorganic insulating layer  80  may be increased by this configuration so as to distribute the stress here, and the fracture happens during bending may be prevented by preventing the stress from being too concentrated. 
       FIG.  3 C  is a cross-sectional view of the electronic device  1 A in  FIG.  3 A  while being bent in the same way as in  FIG.  2 A . The bending area  4  in  FIG.  2 A  has an arc-liked shape, and the thickness L of the bending area  4  may be, for example but not limited to, greater than or equal to 100 μm, and less than or equal to 500 μm, such as 100 μm, 250 μm or 400 μm. In  FIG.  3 C , when comparing with the situation in  FIG.  3 A  which the electronic device  1 A is not bent, the first conductive layer  40 A is compressed to increase the angle between each of the adjacent segments of the first conductive layer  40 A, and the second conductive layer  50 A is stretched to decrease the angle between each of the adjacent segments of the second conductive layer  50 A, so the resilient structure  60 A may be deformed, as indicated by arrows  401  and arrows  501 . As a result, the stress created when the bending area  4  of the electronic device  1 A is bent may be distributed, the wiring area  5  may be hided at the back side of the display area  2 , or the freedom of wiring may be increased, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIG.  3 D  is a cross-sectional view of the electronic device  1 A in  FIG.  3 A  while being bent in the same way as in  FIG.  2 B . It should be noted that the ratios of the sizes between the elements in  FIG.  3 D  are different from the former figures for convenience. In  FIG.  3 D , when comparing with the situation in  FIG.  3 B  which the electronic device  1 A is not bent, the first conductive layer  40 A is compressed to increase the angle between each of the adjacent segments of the first conductive layer  40 A, and the second conductive layer  50 A is stretched to decrease the angle between each of the adjacent segments of the second conductive layer  50 A, so the resilient structure  60 A may be deformed. Furthermore, at the interface D, the flexible substrate  20  exposed by the opening  12  comes closer to or contacts with the supporting substrate  10  during the bending condition shown in  FIG.  3 D . As a result, while the bending area  4  of the electronic device  1 A is bent, the wiring area  5  may be hided at the back side of the display area  2 , or the freedom of wiring may be increased, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIG.  4 A  is a cross-sectional view of an electronic device  1 B according to another embodiment of the present disclosure. In  FIG.  4 A , the electronic device  1 B includes a supporting substrate  10 , a flexible substrate  20 , a first organic insulating layer  30 , a first conductive layer  40 B, a second conductive layer  50 B, a resilient structure  60 B, a second organic insulating layer  70  and an inorganic insulating layer  80 . 
     The flexible substrate  20  is disposed on the supporting substrate  10 . At the non-display area  3 , the supporting substrate  10  is separated by the opening  12  as two portions, and some of the flexible substrate  20  is exposed by the opening  12 . The first organic insulating layer  30  and the inorganic insulating layer  80  are disposed on the flexible substrate  20 , and the thickness of the first organic insulating layer  30  is substantially identical to the thickness of the inorganic insulating layer  80 . The angle between the interface  30 A or the interface  30 B to the flexible substrate  20  is θ 1 , wherein the interface  30 A or the interface  30 B are interfaces formed between the first organic insulating layer  30  and the inorganic insulating layer  80 . In some embodiments, the angle θ 1  is greater than 90 degrees and less than 180 degrees. 
     The first conductive layer  40 B is disposed on the first organic insulating layer  30  and the inorganic insulating layer  80 , and the second conductive layer  50 B is disposed on the first conductive layer  40 B. The resilient structure  60 B includes a plurality of resilient elements  61 B disposed between the first conductive layer  40 B and the second conductive layer  50 B, and the second organic insulating layer  70  is disposed on the second conductive layer  50 B. The first organic insulating layer  30 , the first conductive layer  40 B, the second conductive layer  50 B, the resilient structure  60 B and the second organic insulating layer  70  are disposed in the non-display area  3 . 
     In this embodiment, the materials of the supporting substrate  10 , the flexible substrate  20 , the first organic insulating layer  30 , the first conductive layer  40 B, the second conductive layer  50 B, the resilient structure  60 B, the second organic insulating layer  70  and the inorganic insulating layer  80  are identical or similar to the material of the supporting substrate  10 , the flexible substrate  20 , the first organic insulating layer  30 , the first conductive layer  40 A, the second conductive layer  50 A, the resilient structure  60 A, the second organic insulating layer  70  and the inorganic insulating layer  80 , respectively, and are not repeated. 
     In  FIG.  4 A , there is a distance between each of the resilient elements  61 B rather than forming the resilient elements  61 B continuously. The distance between two adjacent resilient elements  61 B may be identical or different. The first conductive layer  40 B contacts the second conductive layer  50 B at intervals, wherein the first conductive layer  40 B may directly contact the second conductive layer  50 B at intervals, or conductive elements may be disposed between the first conductive layer  40 B and the second conductive layer  50 B to allow the first conductive layer  40 B indirectly contacts the second conductive layer  50 B at intervals. Furthermore, the first conductive layer  40 B contacts the second conductive layer  50 B and the resilient elements  61 B alternately to bend these structures. It is different from the embodiment shown in  FIG.  3 A  that the sides where the resilient elements  61 B contact the first conductive layer  40 B and the second conductive layer  50 B have an arc-liked shape. In other words, the first conductive layer  40 B and the second conductive layer  50 B are disposed on the resilient elements  61 B smoothly and have a wavy shape instead of being bent as several segments. In this embodiment, the first organic insulating  30  and the resilient elements  61 B having arc-shaped sides may be made by using a multi-tone mask, such as half tone mask or gray tone mask. However, the present disclosure is not limited thereto. 
       FIG.  4 B  is a schematic view of the electronic device  1 B while being bent in the same way as in  FIG.  2 A . In  FIG.  4 B , the bending area  4  has an arc-liked shape, and the thickness L of the bending area  4  is greater than or equal to 100 μm and less than or equal to 500 μm, such as 100 μm, 250 μm or 400 μm. Similar to the embodiment shown in  FIG.  3 C , the first conductive layer  40 B is compressed and the second conductive layer  50 B is stretched, so the resilient structure  60 B may be deformed. As a result, while the bending area  4  of the electronic device  1 B is bent, the wiring area  5  may be hided at the back side of the display area  2 , or the freedom of wiring may be increased, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIG.  4 C  is a cross-sectional view of the electronic device  1 B while being bent in the same way as in  FIG.  2 B . It should be noted that the ratios of the sizes between the elements in  FIG.  4 C  are different from the former figures for convenience. In  FIG.  4 C , when comparing with  FIG.  4 A  which the electronic device  1 A is not bent, the first conductive layer  40 B is compressed, and the second conductive layer  50 B is stretched, so the resilient structure  60 B may be deformed. Furthermore, at the interface E, the flexible substrate  20  exposed by the opening  12  comes closer to or contacts with the supporting substrate  10  during the bending condition shown in  FIG.  4 C . As a result, while the bending area  4  of the electronic device  1 B is bent, the wiring area  5  may be hided at the back side of the display area  2 , or the freedom of wiring may be increased, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. 
       FIGS.  5 A to  5 C  are schematic views of the position relationship between the second conductive layer  50 A (or the second conductive layer  50 B) to the resilient elements  61 A (or the resilient elements  61 B) of the bending area  4  when viewed along a normal direction to the surface of the flexible substrate  20 . Hereinafter, the resilient elements  61 A and the resilient elements  61 B are described as resilient elements  62 , resilient elements  63 , first resilient elements  64 A and second resilient elements  64 B in different embodiments. It should be noted that the first conductive layer  40 A or the first conductive layer  40 B overlaps the second conductive layer  50 A or the second conductive layer  50 B in top view, respectively, so the first conductive layer  40 A or the first conductive layer  40 B is not illustrated. 
     In  FIG.  5 A , the second conductive layer  50 A or the second conductive layer  50 B includes a plurality of conductive strips  52  extended along the Y direction and parallel with each other. In the present disclosure, the display area  2 , the bending area  4  and the wiring area  5  are arranged along the Y direction. In this embodiment, each of the resilient elements  62  has an island-liked shape, wherein there are a plurality of resilient elements  62  disposed under each of the conductive strips  52  at interval. The resilient elements  62  on different conductive strips  52  are arranged along the X direction to increase the symmetries of the stress along different directions. As a result, the possibility of the devices being damaged caused by the stress concentration on a direction due to asymmetry of the stresses may be reduced. In other embodiments, the resilient elements  62  on different conductive strips  52  may be not aligned along the X direction. In other embodiments, the amount of the resilient elements  62  on different conductive strips  52  may be different. Furthermore, although the width of the resilient elements  62  along the X direction is illustrated as identical to the width of the conductive strips  52  along the X direction, the present disclosure is not limited thereto. For example, depending on design requirement, the dimension of the resilient elements  62  may be adjusted to allow the width of the resilient elements  62  along the X direction being greater than or less than the width of the conductive strips  52  along the X direction to increase the freedom of processes. 
     In  FIG.  5 B , the second conductive layer  50 A or the second conductive layer  50 B includes a plurality of conductive strips  52  extended along the Y direction and parallel with each other. In this embodiment, each of the resilient elements  63  is strip-shaped, extends toward the X direction and passes under a plurality of conductive strips  32 . In other words, each of the resilient elements  63  passes through multiple conductive strips  52 , wherein the X direction is substantially perpendicular to the Y direction. The resilient elements  63  are substantially parallel to each other to increase the symmetries of the stress along different directions. As a result, the possibility of the devices being damaged caused by the stress concentration due to asymmetry of the stresses may be reduced. In other embodiments, the resilient elements  63  may be not parallel to each other. 
     In  FIG.  5 C , the second conductive layer  50 A or the second conductive layer  50 B includes a plurality of conductive strips  52  extended along the Y direction and parallel to each other. In this embodiment, the resilient structure has a mesh-liked shape and includes a plurality first strip structures  64 A and a plurality of second strip structures  64 B, wherein the first strip structures  64 A and the second strip structures  64 B intersect at a plurality of intersections, and the intersections overlap the conductive strips  52 . Although the resilient structure in this embodiment is illustrated as having different first strip structures  64 A and second strip structures  64 B for convenience, the actual first strip structures  64 A and the second strip structures  64 B are formed integrally and disposed on the same plane. An angle θ 2  is formed between the first strip structure  64 A and the conductive strip an angle θ 3  is formed between the second strip structure  64 B and the conductive strip  52 , and the angle θ 2  and the angle θ 3  are substantially identical. In other words, the first strip structure  64 A and the second strip structure  64 B are symmetrical relative to the conductive strip  52  to increase the symmetries of the stress along different directions. As a result, the possibility of the devices being damaged caused by the stress concentration due to asymmetry of the stresses may be reduced. In other embodiments, the angle θ 2  may be different than the angle θ 3 . 
       FIG.  6    is a flow diagram  100  of manufacturing the electronic device according to some embodiments of the present disclosure. In step  102 , a supporting substrate is provided. In step  104 , a flexible substrate is provided on the supporting substrate. In step  106 , a thin-film transistor (TFT) may be provided on the flexible substrate. For example, the thin-film transistor may be a semiconductor layer (e.g. amorphous silicon or low temperature poly-silicon (LIPS)), a top gate, bottom gate or double gate thin film transistor formed by metal oxide. In step  108 , an inorganic insulating layer is provided on the thin-film transistor. In step  110 , a portion of the inorganic insulating layer is removed through lithography process, and a first organic insulating layer is provided at where the inorganic insulating layer is removed. In step  112 , a first conductive layer is provided on the first organic insulating layer. In step  114 , a resilient structure is provided on the first conductive layer. In step  116 , a second conductive layer is provided on the resilient structure. In step  118 , a second organic insulating layer is provided on the second conductive layer. 
     In summary, a flexible electronic device is provided in the present disclosure. The structure of the flexible electronic device is flexible, which allows its wiring area being hidden at the back side of the display area, enhancing the freedom of wiring, and allows a greater display space, so as to be a means for producing an electronic device having a narrow frame or a combined electronic device with a narrow gap. Furthermore, at least two conductive structures electrically connected with each other are formed in the bending area. As a result, even if one of the conductive structures is fractured because of being bent, another conductive structure can keep transporting electrical signal to increase the reliability of the electronic device. 
     Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, and composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope of such processes, machines, manufacture, and compositions of matter, means, methods, or steps. In addition, each claim constitutes a separate embodiment, and the combination of various claims and embodiments are within the scope of the disclosure.