Patent Publication Number: US-2023162628-A1

Title: Electronic device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application of U.S. application Ser. No. 17/105,413, filed on Nov. 25, 2020. The content of the application is incorporated herein by reference. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     1. Field of the Disclosure 
     The present disclosure relates generally to an electronic device and more particularly, to an electronic device having a flexible display panel. 
     2. Description of the Prior Art 
     Electronic products have become an indispensable necessity in modern society. With the fast development of these electronic products, consumers have higher expectations on the quality, the function or the price thereof. 
     Some of the electronic products have an illuminating function or a displaying function, but none of them have met the requirements in all aspects. 
     SUMMARY OF THE DISCLOSURE 
     The present disclosure provides an electronic device including a flexible display, a capacitive fingerprint sensor, a driving circuit and signal lines. The flexible display includes a plurality of light emitting diodes. The capacitive fingerprint sensor is disposed on the flexible display. The signal lines are electrically connecting the capacitive fingerprint sensor and the driving circuit. 
     The present disclosure also provides an electronic device including a flexible display, a sensor electrode, and a plurality of signal lines. The flexible display includes a plurality of light emitting diodes. The sensor electrode is disposed on the flexible display. The plurality of signal lines is electrically connected to the sensor electrode, wherein the plurality of signal lines includes a mesh structure, the mesh structure includes a plurality of openings, and one of the plurality of light emitting diodes is in one of the plurality of openings. 
     These and other objectives of the present disclosure will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    to  FIG.  5    are schematic diagrams illustrating an electronic device according to a first embodiment of the present disclosure; in which: 
         FIG.  1    shows an appearance of the electronic device in bending mode; 
         FIG.  2    shows another appearance of the electronic device in bending mode; 
         FIG.  3    shows a partial cross-sectional view of the electronic device in stretching mode; 
         FIG.  4    shows a disposing view of signal lines in a display of the electronic device; and 
         FIG.  5    shows a disposing view of sensing electrodes in a display of the electronic device. 
         FIG.  6    is a schematic diagram illustrating another disposing view of sensing electrodes in a display of the electronic device. 
         FIG.  7    is a schematic diagram illustrating another disposing view of sensing electrodes in a display of the electronic device. 
         FIG.  8    to  FIG.  10    are schematic diagrams illustrating an electronic device according to a second embodiment of the present disclosure; in which: 
         FIG.  8    shows a disposing view of sensing electrodes in a display of the electronic device; 
         FIG.  9    shows an appearance of the electronic device in bending mode; and 
         FIG.  10    shows another appearance of the electronic device in bending mode. 
         FIG.  11    to  FIG.  12    are schematic diagrams illustrating an electronic device according to a third embodiment of the present disclosure; in which: 
         FIG.  11    shows a top view of the electronic device in stretching mode; 
         FIG.  12    shows another top view of the electronic device in stretching mode. 
         FIG.  13    is a schematic diagram illustrating an electronic device according to a fourth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure may be understood by reference to the following detailed description, taken in conjunction with the drawings as described below. For purposes of illustrative clarity understood, various drawings of this disclosure show a portion of the electronic device, and certain elements in various drawings may not be drawn to scale. In addition, the number and dimension of each device shown in drawings are only illustrative and are not intended to limit the scope of the present disclosure. 
     Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will understand, electronic equipment manufacturers may refer to a component by different names. In the following description and in the claims, the terms “include”, “comprise” and “have” are used in an open-ended fashion, and thus should be interpreted to mean “include, but not limited to”. 
     It may also understand that when an element or layer is referred to as being “on” or “connected to” another element or layer, it can be directly on or directly connected to the other element or layer, or intervening elements or layers may be presented. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element or layer, there are no intervening elements or layers presented. 
     As disclosed herein, the term “about” or “substantial” generally means within 20%, 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range. Unless otherwise expressly specified, all of the numerical ranges, amounts, values and percentages disclosed herein should be understood as modified in all instances by the term. “about” or “substantial”. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the present disclosure and attached claims are approximations that can vary as desired. 
     Although terms such as first, second, third, etc., may be used to describe diverse constituent elements, such constituent elements are not limited by the terms. The terms are used only to discriminate a constituent element from other constituent elements in the specification. The claims may not use the same terms, but instead may use the terms first, second, third, etc. with respect to the order in which an element is claimed. Accordingly, in the following description, a first constituent element may be a second constituent element in a claim. 
     The technical features in different embodiments described in the following can be replaced, recombined, or mixed with one another to constitute another embodiment without departing from the spirit of the present disclosure. 
     Please refer to  FIG.  1    to  FIG.  5   , which are schematic diagrams illustrating an electronic device  10  according to the first embodiment of the present disclosure, wherein  FIG.  1    to  FIG.  2    show appearances of the electronic device  10 ,  FIG.  3    shows a cross-sectional view of partial structure the electronic device  10  in non-bending mode, and  FIG.  4    to  FIG.  5    show a top view of partial elements of the electronic device  10 . The electronic device  10  may include a display such as a flexible display  100  as shown in  FIG.  1    to  FIG.  3   . In view of  FIG.  1    to  FIG.  3   , the flexible display  100  may include a substrate  110 , a circuit layer  130  and a pixel array  150 . The material of the substrate  110  may be any flexible material like plastic (such as polyimide or polyethylene terephthalate), but is not limited thereto. The substrate  110  may further include a flat region  111  and at least one bending region  113 , and the bending region  113  may connect to a side of the flat region  111 . In the present embodiment, two bending regions  113  may be respectively adjacent to two opposite sides of the flat region  111 , and the two bending regions respectively include a bending axis “A” extending along a first direction D 1 . In other embodiments, the extending directions of the bending axis “A” of the two bending regions  113  may be different from each other. A display region  115  of the electronic device  10  may cover the flat region  111  and at least a portion of the bending region(s)  113 , as shown in  FIG.  1   , but is not limited thereto. In one embodiment, an insulating layer  131  may be, but not limited to, disposed between the circuit layer  130  and the pixel array  150 . Person skilled in the art should easily understand the relative relationship of the configuration of the aforementioned bending region  113  and the flat region  111 , as well as the covering area of the display region  115 , may be further adjusted according to practical product requirements and is not limited to what is shown in  FIG.  1   . Also, the flat region  111  in the present disclosure may include a non-bending surface related to the bending region  113 , and the flat region  111  is not limited to include a flat surface. 
     In the present embodiment, the bending region  113  and the flat region  111  may be monolithic, that is, both of the bending region  113  and the flat region  111  are different portions of the same structure which is composed of the same material, and the bending region  113  and the flat region  111  are not formed by combining or joining different structures, but it is not limited thereto. The flat region  111  may include the characteristics of being non-bendable or not easily bendable, that is, the flat region  111  may be a substantially planar structure in bending mode or in stretching mode (non-bending mode), but not limited thereto. The bending region  113  may include the characteristics of being bendable, that is, it may be a substantially planar structure in stretching mode and may be a curved structure in bending mode, but not limited thereto. It is noted that, the flat region  111  and the bending region  113  may substantially form a planar structure (not shown in the drawings) in stretching mode, that is, surfaces of the flat region  111  and the bending region  113  may be substantially coplanar, for example, being a plane which is formed by the first direction D 1  and a second direction D 2 . The first direction D 1  and the second direction D 2  may be two directions which are intersecting or substantially perpendicular with each other, for example, the angle between the first direction D 1  and the second direction D 2  is between 75° and 105° (75°≤the angle≤105°), but is not limited thereto. On the other hand, the bending region  113  may be bent around the bending axis “A” in bending mode. In the present embodiment, the bending region  113  may be bent toward another direction (not shown in the drawing) related to the bending axis “A”. The another direction and the first direction D 1  may be substantially orthogonal to each other, that is, the another direction may be a direction substantially perpendicular to the substrate  110  (namely, the normal direction of the substrate  110 ) or a direction substantially perpendicular to the X-Y plane, such as the Z direction. In addition, the bending angle or the bending radius of the bending region  113  with respect to the bending axis “A” is not limited to what is shown in  FIG.  1   , and which may be further adjusted according to product requirements. For example, as shown in  FIG.  2   , in another embodiment, the bending region  113  may be further bent around the bending axis “A” until a portion of the bending region  113  is bent to the back side of the flat region  111 . 
     Next,  FIG.  3    shows a cross-sectional view of the electronic device in the second direction D 2  and a third direction D 3 , and the third direction D 3  may be substantially perpendicular to a surface  110 S of the substrate  110  or be substantially perpendicular to the X-Y plane. The circuit layer  130  may be disposed on the surface  110 S of the substrate  110 . The pixel array  150  may be disposed on the circuit layer  130 . The pixel layer  150  may include a plurality of pixels  150 P. The pixel  150 P may include a plurality of sub-pixels for displaying the same color or different colors, such as a sub-pixel  151 , a sub-pixel  153  and a sub-pixel  155  for respectively displaying red, blue or green colors, but not limited thereto. In other embodiments, the pixel  150 P may also include a sub-pixel for displaying other colors, such as a yellow sub-pixel. In the present embodiment, the pixel array  150  may be a self-illuminating module array, such as a light emitting diode display array. In other words, the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155  may respectively include at least one light emitting diode and other elements for providing a display function, and the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155  may respectively correspond to the electrical elements of the circuit layer  130 , such as a thin film transistor element (not shown in the drawings), a storage capacitor element (not shown in the drawings) or the like. Furthermore, the pixel array  150  may be driven by a driving circuit  157  disposed on the substrate  110 . In one embodiment, a thin film encapsulation (TFE) layer  159  may be disposed on the pixel array  150 . In another embodiment, the pixel  150 P may include an inorganic light emitting diode, an organic light emitting diode (OLED), micro light-emitting diode, mini light-emitting diode, quantum dot light emitting diodes (QLED/QDLED), nano wire light-emitting diode or bar type light-emitting diode, but not limited thereto. In other embodiments, the pixel array  150  may also include a non-self-illuminating module array, such as a liquid crystal display module. While the pixel array  150  includes the non-self-illuminating module array, the electronic device  10  may further include a backlight module (not shown in the drawings), and the backlight module may be disposed under the substrate  110 . 
     As shown in  FIG.  3   , the electronic device  10  may further include a touch sensor  200  disposed on the flexible display  100 . The touch sensor  200  may include a plurality of touch electrodes  210 ; the touch electrodes  210  may be in an array arrangement. The material of the touch electrodes  210  may include a transparent conductive material, a metal material, a suitable material or a combination thereof, but not limited thereto. The transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), cadmium tin oxide (CTO), aluminum zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide, cadmium oxide, hafnium oxide (HfO), indium gallium zinc oxide (InGaZnO), indium gallium zinc magnesium oxide (InGaZnMgO), indium gallium magnesium oxide (InGaMgO), indium gallium aluminum oxide (InGaAlO) or the like, but not limited thereto. Also, the touch sensor  200  may also be driven by a driving circuit  330  disposed on the substrate  110  or other driving circuit (not shown in the drawings). 
     On the other hand, the electronic device  10  may further include a fingerprint sensor  300  which may be also disposed on the flexible display  100 . The fingerprint sensor  300  may be disposed adjacent to the touch sensor  200 . For example, the fingerprint sensor  300  may be a capacitive fingerprint sensor, but not limited thereto. The fingerprint sensor  300  may include a plurality of sensing electrodes  310 , and the sensing electrodes  310  may be in an array arrangement. The sensing electrodes  310  may be disposed on the pixel array  150 . In one embodiment, the touch electrodes  210  of the touch sensor  200  may be arranged together with the sensing electrodes  310  of the fingerprint sensor  300 , for example being both included the same or different conductive films, but not limited thereto. As an example, the distribution density of the sensing electrodes  310  may be less than the distribution density of the touch electrodes  210 , but not limited thereto. In some embodiments, the touch electrodes  210  and the sensing electrodes  310  may be disposed at two opposite sides of the substrate  110  respectively, for example being disposed at the left side and the right side as shown in  FIG.  3   . An insulating layer  320  may be further disposed on the touch sensor  200  and the fingerprint sensor  300 , covering on the touch electrodes  210  and the sensing electrodes  310 . However, in other embodiments, the touch sensor may also be omitted according to product requirements, that is, the electronic device may only include the fingerprint sensor without disposing the touch sensor. Accordingly, only the sensing electrodes of the fingerprint sensor are disposed on the pixel array in the array arrangement (this embodiment is not shown in the drawings). Also, the sensing electrodes  310  may be driven by different driving methods to detect touching or fingerprint sensing at different time points. In other words, the touch electrodes  210  may be replaced by the sensing electrodes  310 , or the sensing electrodes  310  may include both of the touch function and the fingerprint sensing function, but not limited thereto. 
     The material of the sensing electrodes  310  may be similar to those of the touch electrodes  210 , and which will not be redundantly described hereinafter. Furthermore, the sensing electrodes  310  may also be driven by the driving circuit  330  disposed on the substrate  110 . In one embodiment, the formation of the driving circuit  330  may be optionally integrated with the formation of the circuit layer  130 , that is, the driving circuit  330  and the circuit layer  130  of the electronic device  10  may be formed together in the same conductive layer, and also, may include the same or similar conductive materials, but not limited thereto. In the present embodiment, the sensing electrodes  310  may be connected to the driving circuit  330  via a plurality of signal lines  350 , to electrically connect the fingerprint sensor  300  to the driving circuit  330 . However, in another embodiment, the fingerprint sensor  300  may also be electrically connected to the driving circuit  330  through other methods, to omit the disposing of the signal lines  350 . With the sensing electrodes  310 , the sensing electrodes  310  may be used to scan the ridges and valleys of the fingerprint by sensing the charge difference, the temperature difference or pressure difference caused by the finger, when the finger touches the electronic device  10 , thereby identifying the fingerprint patterns. 
       FIG.  4    shows a top view of an area R 1  in  FIG.  3   . Precisely speaking, as shown in  FIG.  4   , the driving circuit  330  may include a plurality of driving units  331 , and the driving circuit  330  may be electrically connected to the sensing electrodes  310  through the signal lines  350 . It is noted that, a width W 1  of the sensing electrode  310  in the second direction D 2  is for example about 50 μm to 300 μm (50 μm≤W 1 ≤300 μm), such as 100 μm or 200 μm, therefore, one sensing electrode  310  may correspond to several sub-pixels such as the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155  underneath at the same time. The width W 1  may be the greatest width of the sensing electrode  310  in the second direction D 2 , but not limited thereto. The signal lines  350  may be disposed in the spacing between the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155  while the signal lines  350  are connected to the sensing electrodes  310 , to reduce the amount of light blocked by the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155 . In one embodiment, at least one signal line  351  may include a plurality of branches  351   a  and a plurality of branches  351   b , the branches  351   a  and the branches  351   b  may be alternately arranged in sequence and respectively extend along different directions (for example a direction D 4  and a direction D 5 , but not limited thereto). Then, the signal lines  351  may be disposed in the spacing between the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155 . In other words, the signal lines  351  may include a zig-zag structure. In one embodiment, the plurality of branches  351   a  may also extend along several different directions, but not limited thereto. The signal lines  351  may include different lengths in the second direction D 2  to connect electrically to different sensing electrodes  310 . For example, a signal line  351  may electrically connect to one of the sensing electrodes  310  that is adjacent to the driving circuit  330 , another signal line  351  may electrically connect to another sensing electrode  310 , and the two signal lines  351  may include different lengths in the second direction D 2 , but is not limited thereto. An angle θ 1  between the direction D 4  and the direction D 5  is for example between zero degree to 90 degrees) (0°≤θ 1 ≤90°), such as 30 degrees or 60 degrees, but not limited thereto. In one embodiment, an angle θ 2  between the signal lines  351  and the extending direction (for example the first direction D 1 ) of the bending axis “A” may be greater than zero degree and less than or equal to 90 degrees (0°&lt;θ 2 ≤90°), for example being 30 degrees, 45 degrees, 60 degrees or 75 degrees, but not limited thereto. 
     Person skilled in the art should easily understand that while disposing the signal lines  350  in the spacing between the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155 , the disposing structure of the signal lines  350  is not limited to the aforementioned zig-zag structure and may further include other types. For example, in another embodiment, a plurality of branches  353   a  and a plurality of branches  353   b  of at least one of the signal lines  353  may also be continuously arranged side by side and extend in different directions (for example the direction D 4  and the direction D 5 ) at the same time, and the signal lines  353  may generally present a mesh structure. Accordingly, the corresponding sub-pixel  151 , the corresponding sub-pixel  153  or the corresponding sub-pixel  155  may be exposed from mesh portions  353   m  or mesh portions  353   n  that are consisted by the branches  353   a  and the branches  353   b . In other words, the signal lines  353  may include a plurality of openings for exposing the sub-pixel  151 , the sub-pixel  153  or the sub-pixel  155 , so that, one of the openings may be corresponded to at least one of the sub-pixel  151 , the sub-pixel  153  and the sub-pixel  155 . Also, the branch(es)  353   a  and the branch(es)  353   b  may constitute a complete mesh portion  353   m , or may also constitute an incomplete mesh portion  353   n , so that, the signal lines  353  may contact to the corresponding sensing electrodes  310  through the complete mesh portions  353   m  or the incomplete mesh portions  353   n  thereof. In some embodiments, since the signal lines  350  and the sensing electrodes  310  are disposed in different layers, the signal lines  350  may include at least one contact portion (such as two contact portions, not shown in the drawings), or at least two contact portions (such as more than two contact portions, not shown in the drawings) electrically connected to one of the sensing electrodes  310 . For example, the contact portion may include a through hole or other electrical connection structure, but not limited thereto. It may include an angle between different portions of the signal lines  353  and the extending direction of the bending axis “A”, such as the angle θ 2  or the angle θ 3 , and the angle may be greater than zero degree and less than or equal to 90 degrees (0°&lt;θ 2  or θ 3 ≤90°), such as 30 degrees, 45 degrees, 60 degrees, 75 degrees or 90 degrees, but not limited thereto. It is noted that, although the signal lines  350  are all exemplified as a regular zig-zap structure (with the size of each sharp portion and each concave portion of the zig-zap structure being substantially the same with each other) or a regular mesh structure (with the size of each mesh portion of the mesh structure being substantially the same with each other) in each of the aforementioned embodiments, the practical fabricating process of the signal lines  350  is not limited thereto. The branches of the signal lines may also have more than two extending directions under different disposing requirements to present an irregular zig-zag structure or an irregular mesh structure. 
     On the other hand, as shown in  FIG.  5   , the sensing electrodes  310  may also include various aspects according to practical disposing requirements. For example, in one embodiment, a distribution density of at least a portion of the sensing electrodes  311  is for example about 25 to 50 sensing electrodes per square millimeter (25-50 items/mm 2 ), such as 30 or 40 sensing electrodes per square millimeter. Then, the sensing electrodes  311  may have a relatively greater spacing G 1  therebetween, for example, being about 30 μm to 50 μm (30 μm≤G 1 ≤50 μm), such as 35 μm or 45 μm, but not limited thereto. The spacing G 1  may be the smallest distance between two adjacent sensing electrodes  311 . Accordingly, a portion of the sub-pixel  151 , the sub-pixel  153  or the sub-pixel  155  may be disposed at the spacing G 1  between the sensing electrodes  311 , thereby being exposed therefrom, as shown in  FIG.  5   . In this way, while the signal lines  350  (as shown in  FIG.  3    and  FIG.  4   ) are provided to electrically connect the sensing electrodes  311 , the signal lines  350  may obtain a relative greater process window thereby. On the other hand, another portion of the sensing electrodes  313  may optionally include a relatively greater distribution density, for example the distribution density being increased to about 100 to 400 per square millimeter (100-400 items/mm 2 ), that is, a spacing G 2  between the sensing electrodes  313  is shrunken for example to about 5 μm to 10 μm (5 μm≤G 2 ≤10 μm), such as being 7 μm, but not limited thereto. The spacing G 2  may be the smallest distance between two adjacent sensing electrodes  313 . Accordingly, since the spacing G 2  between the sensing electrodes  313  is smaller, the sub-pixel  151 , the sub-pixel  153  or the sub-pixel  155  may not be exposed therefrom. Then, the disposing of the sensing electrodes  313  may be more compact to improve the resolution of the fingerprint sensor  300 . Also, a portion of the sensing electrodes  315  may be optionally formed into a metal mesh structure, with traces being formed by metal with good conductivity (such as gold, silver, copper, aluminum, tungsten or an alloy of above metal, but not limited thereto) to form at least a portion of the sensing electrodes  315 . In other words, the sensing electrodes  315  may further include a plurality of mesh portions  315   m , which also includes a plurality of openings for exposing the sub-pixel  151 , the sub-pixel  153  or the sub-pixel  155 , and the sub-pixel  151 , the sub-pixel  153  or the sub-pixel  155  may be disposed within the openings of the mesh portions  315   m  to be exposed therefrom. In this way, the influences to the display brightness of the pixel array  150  caused by the sensing electrodes  315  may be reduced. Person skilled in the art should realize that although the present embodiment may include the sensing electrodes  311 , the second electrodes  313  and the sensing electrodes  315  with various types at the same time, the practical arrangement is not limited thereto. In other embodiments, a single type of the sensing electrodes may be optionally disposed based on the product requirements, for example, only disposing the sensing electrodes  315  to reduce the influences to the display brightness, or only disposing the sensing electrodes  313  to improve the resolution, or only disposing the sensing electrodes  311  to improve the processing window of the wires, but not limited thereto. The advantages of the above mentioned sensing electrodes are only for example, and which may actually have more or other advantages, and the present disclosure is not limited thereto. 
     In addition, as shown in  FIG.  6    and  FIG.  7   , in another embodiment, the fingerprint sensor  300  may further include a plurality of first sensing electrodes  317   a  and a plurality of second sensing electrodes  317   b , to form a mutual-capacitive electrode array. For example, one of the first sensing electrode  317   a  and the second sensing electrode  317   b  may be a driving electrode, and the other one of the first sensing electrode  317   a  and the second sensing electrode  317   b  may be a sensing electrode. It is noted that,  FIG.  6    and  FIG.  7    only illustrate a partial cross-sectional view of the electronic device. Precisely speaking, the first sensing electrodes  317   a  and the second sensing electrodes  371   b  may be two electrode layers, which are formed successively by similar or different processes, but not limited thereto. The first sensing electrodes  317   a  are for example parallelly arranged along a first axis (for example the first direction D 1  as shown in  FIG.  1   ), and the second sensing electrodes  317   b  are for example parallelly arranged along a second axis (for example the second direction D 2  as shown in  FIG.  1   ). The first sensing electrodes  317   a  and the second sensing electrodes  317   b  may be alternately arranged in another direction D 6  that is different from the first direction D 1  and the second direction D 2 , as shown in  FIG.  6   . The direction D 6  for example has an angle of 45 degrees with the first direction D 1  and the second direction D 2 , but is not limited thereto. Also, an insulating layer  320   a  and an insulating layer  320   b  may respectively cover on the first sensing electrodes  317   a  and the second sensing electrodes  317   b , for isolating the first sensing electrodes  317   a  and the second sensing electrodes  317   b . In other embodiments, the fingerprint sensor  300  may also include a self-capacitive electrode array, for example, only disposing the first sensing electrodes  317   a  or only disposing the second sensing electrodes  317   b . As an example, only the first sensing electrodes  371   a  are disposed to provide driving and sensing function, but not limited thereto. 
     Moreover, as shown in  FIG.  7   , another substrate  340  may be further disposed between the first sensing electrodes  317   a  and the second sensing electrodes  317   b , and the second sensing electrodes  317   b  may be disposed on the substrate  340 . The material of the substrate  340  includes a dielectric material, an insulating material, or other suitable material, so that, the distance between the first sensing electrodes  317   a  and the second sensing electrodes  317   b  may be enlarged to reduce the parasitic capacitance between the first sensing electrodes  317   a  and the second sensing electrodes  317   b  to achieve better sensing signals thereby. 
     Through these arrangements, the issues that the flexible display  100  is frequently bent and used to affect the overall performance of the electronic device  10  may be improved. However, person skilled in the arts should easily realize the electronic device  10  of the present disclosure may also include another type of arrangement in order to meet the practical product requirement. The following description will detail the different embodiments of the electronic device in the present disclosure. To simplify the description, the following description will detail the dissimilarities among the different embodiments and the identical features will not be redundantly described. In order to compare the differences between the embodiments easily, the identical components in each of the following embodiments are marked with identical symbols. 
     Please refer to  FIG.  8    to  FIG.  10   , which are schematic diagrams illustrating an electronic device  20  according to the second embodiment of the present disclosure, wherein  FIG.  8    shows the disposing electrodes within the display substrate of the electronic device  20 , and  FIG.  9    and  FIG.  10    show the appearance of the electronic device in bending mode. The structure of the electronic device  20  of the present embodiment is substantially the same as that of the aforementioned first embodiment, and, which also includes the flexible display  100  and the fingerprint sensor  300   a  disposed on the flexible display  100 . All similarity between the present embodiment and the aforementioned embodiment will not be redundantly described hereinafter. The difference between the present embodiment and the aforementioned embodiment is mainly in that the distribution density of the electrode array of the fingerprint sensor  300   a  may be different in various regions. 
     Precisely speaking, as shown in  FIG.  8   , the flexible display  100  of the present embodiment also includes the flat region  111  and the bending region  113 , and two opposite sides of the bending region  113  may be adjacent to two flat regions  111  respectively, but not limited thereto. In the present embodiment, a width W 2  of the sensing electrodes  319   b  may be shrunken to for example about 20 μm to 30 μm (20 μm≤W 2 ≤30 μm), such as 25 μm, so that, the distribution number of the sensing electrodes  319   b  per unit area may be increased, thereby performing a relative greater distribution density. In the present embodiment, the distribution density of the sensing electrode  319   b  within the bending region  113  may be greater than the distribution density of the sensing electrode  319   a  within the flat region  111 . Then, the width W 1  of the sensing electrodes  319   a  disposed in the flat region  111  may be different from the width W 2  of the sensing electrodes  319   b  disposed in the bending region  113 , so that, the sensing electrodes  319   a  within the flat region  111  and the sensing electrodes  319   b  with in the bending region  113  may include different distribution densities according to the bendable function of the substrate  110 , but is not limited thereto. For example, the width W 1  and the width W 2  may be the greater width in the second direction D″. In another embodiment, the sensing electrodes  319   a  within the flat region  111  and the sensing electrodes  319   b  within the bending region  113  may have different spacing or pitches (not shown in the drawings), or the sensing electrodes  319   a  within the flat region  111  and the sensing electrodes  319   b  within the bending region  113  may have both different widths and pitches (not shown in the drawings), to adjust the distribution number of the sensing electrodes  319   a  or the sensing electrodes  319   b  per unit of the flat region  111  and the bending region  113  to obtain different distribution densities. Also, the spaced distance between the sensing electrodes  319   a  within the flat region  111  and the spaced distance between the sensing electrodes  319   b  within the bending region  113  may also be different. For example, the spaced distance between the sensing electrodes  319   b  within the bending region  113  may be smaller, and the spaced distance between the sensing electrodes  319   a  within the flat region  111  may be greater, but not limited thereto. 
     With these arrangements, the resolution and the recognition of the sensing electrodes  319   b  disposed in the bending region  113  may be improved. Even if the electronic device  20  is used in bending mode, the sensing electrodes  319   b  may still be attached to a large area of fingerprint surfaces, thereby generating a sensing signal. Thus, the electronic device  20  of the present embodiment may be a wearable electronic device as shown in  FIG.  9   . The electrode array of the aforementioned fingerprint sensor  300   a  may be disposed on the wearable electronic device, wherein the sensing electrodes  319   b  with a relative smaller width W 2  may be disposed in the bending region  113  of the wearable electronic device to match the fingerprint recognition function of the wearable electronic device in bending mode. At this time, the user only has to provide a little pressure to fit the fingers easily on the surface of the wearable electronic device, followed by using the high-density sensing electrodes  319   b  for fingerprint sensing. Otherwise, the electronic device  20  of the present embodiment may also be a foldable electronic device as shown in  FIG.  10   . The electrode array of the aforementioned fingerprint sensor  300   a  may be disposed on the foldable electronic device, wherein the sensing electrodes  319   b  with a relative smaller width W 2  may also be disposed in the bending region  113  of the foldable electronic device to match the fingerprint recognition function of the foldable electronic device in bending mode. At this time, since the high-density sensing electrodes  319   b  are disposed within the bending region  113 , the foldable electronic device may still perform the fingerprint recognition even in bending mode. 
     Please refer to  FIG.  11    to  FIG.  12   , which are schematic diagrams illustrating an electronic device  30  according to the third embodiment of the present disclosure, wherein  FIG.  11    and  FIG.  12    respectively show a top view of the electronic device in stretching mode. The structure of the electronic device  30  of the present embodiment is substantially the same as that of the aforementioned first embodiment, and also includes the flexible display  100  and the fingerprint sensor  300  disposed on the flexible display  100 . All similarity between the present embodiment and the aforementioned embodiment will not be redundantly described hereinafter. The difference between the present embodiment and the first embodiment is mainly in the disposing of the circuit. 
     As shown in  FIG.  11   , a peripheral region  116  is further disposed on at least one side of the display region  115  of the electronic device  30  in the present embodiment, and a circuit of the electronic device  30  and/or the fingerprint sensor  300  may be disposed in the peripheral region  116 . In the present embodiment, the peripheral region  116  is respectively disposed at two opposite sides of the display region  115 , and an integrated circuit  160  of the electronic device  30  and/or an integrated circuit  360  of the fingerprint sensor  300  are respectively disposed in the periphery region  116 , but not limited thereto. For example, a demux  161  and a demux  361  may be optionally disposed in the peripheral region  116 , wherein the driving circuit  330  of the fingerprint sensor  300 , the demux  361 , and the integrated circuit  360  are disposed in the peripheral region  116  at the right side of the display region  115 , and the driving circuit  160  of the electronic device  30  and the demux  161  are disposed in the peripheral region  116  at the left side of the display region  115 . Furthermore, the signal lines (such as the signal lines  165 ) within the display region  115  may extend along the second direction D 2  to electrically connect to the demux  161  and the demux  361 , and to further electrically connect to the integrated circuit  160  or the integrated circuit  360  to the two sides through a wire  163  and a wire  363 . In one embodiment the demux  161  and the demux  361  may be selected as a 1-to-3 demux, for example a wire  163  connected to the integrated circuit  160  may be divided into three signal lines (such as the signal lines  165  and the like), but not limited thereto. The demux  161  and/or the demux  361  may also be a 1-to-6 demux or a 1-to-10 demux to reduce the fabricating cost of the electronic device  30 . Also, the wire  163  and/or the wire  363  may further include a plurality of mesh portions  163   a  and a plurality of mesh portions  363   a . In one embodiment, the wire  163  may include the mesh portions  163   a  extending along different directions, so that, the wire  163  may withstand a larger bending stress to reduce the influences of frequent bending as being disposed in the bending region  113 . The design of the wire  363  may be similar to the wire  163 . In other embodiments, the design of the wire  163  and the wire  363  is not limited to meshed design, as long as the design for reducing the stress may also be applied on the portion of the wire  163  and the wire  363  within the bending region  113 . On the other hand, a flexible printed circuit (FPC) board  270  may be further disposed outwardly on the peripheral region  116  at one side of the display region  115 , and other circuits may be optionally disposed on the flexible printed circuit board  270 . 
     It is noted that, the circuits of the electronic device  30  and/or the fingerprint sensor  300  may be optionally disposed in the bending region  113  or the flat region  111 . For example, in one embodiment, the demux  161 , the demux  361 , or the driving circuit (such as the driving circuit  330 ) of the electronic device  30  and/or the fingerprint sensor  300  may be disposed in the flat region  111 . In other embodiments, the driving circuit (such as the driving circuit  330 ) of the fingerprint sensor  300  may also be disposed in the bending region  113 , and the demux  161 , the demux  163 , the integrated circuit  169  and/or the integrated circuit  360  are disposed in the flat region  111 , but not limited to. In  FIG.  12   , a circuit configuration is illustrated, but is not limited thereto. 
     Please refer to  FIG.  13   , which is a schematic diagram illustrating an electronic device  40  according to the fourth embodiment of the present disclosure, which shows an appearance and a cross-section view of the electronic device  40  in bending mode. The structure of the electronic device  40  of the present embodiment is substantially the same as that of the aforementioned embodiments, and which also includes the flexible display  100  and the touch sensor  200  and the fingerprint sensor  300  disposed on the flexible display  100 . In addition, the electronic device  40  of the present embodiment also includes the display region  115  and the peripheral regions  116  disposed at two opposite sides of the display region  115 , and all similarity between the present embodiment and the aforementioned embodiments will not be redundantly described hereinafter. The difference between the present embodiment and the aforementioned embodiments is mainly in disposing all of the driving circuit  330  of the fingerprint sensor  300 , the demux  361  and the integrated circuit  360  in the peripheral region  116  to save space or adjust the element arrangement of the electronic device  40  by bending the portion (namely the peripheral region  116  at the right side of the electronic device  40 ) having the circuit disposed thereon to the back side of the electronic device  40 . The integrated circuit  360  of the fingerprint sensor  300  is disposed on the surface  110 S of the substrate  110  through a conductive plastic  365  such as the anisotropic conductive film (ACF). Also, the circuit layer  130  may include several switching elements  132  such as the thin film transistors, but not limited thereto. An insulating layer  131  is disposed on the switching element  132 . 
     On the other hand, the integrated circuit  160  of the flexible display  100  is disposed in the peripheral region  116  at another side of the electronic device  40 , and the integrated circuit  160  is electrically connected to the pixel array  150  through a signal line  180 , and is further connected to a flexible printed circuit board  270  to electrically connect an integrated circuit  260  disposed on the flexible printed circuit board  270 . The sensing electrodes  210  of the tough sensing element  200  is additionally connected to the flexible printed circuit board  270  through a signal line  250 , to electrically connect to the integrated circuit  260 . It is noted that, the integrated circuit  260  of the touch sensor  200  and the integrated circuit  160  of the flexible display  100  are both disposed in the peripheral region  116  at the another side of the electronic device  40 , so that, the portion of the electronic device  40  where includes the circuits of the flexible display  100  and the touch sensor  200  thereon may bent to the back side for saving space or adjusting element arrangement of the electronic device  40 . 
     The electronic device of the present disclosure is not limited to the aforementioned display device, and may further include a lighting device, an antenna device, a sensor device or a tiled device, but is not limited thereto. The electronic device may optionally include a non-rectangular electronic device, a foldable electronic device or a flexible electronic device, such as a flexible liquid crystal display device or a flexible light emitting diode display device. The antenna device may be a liquid crystal antenna, but the present disclosure is not limited thereto. The tiled device may be a tiled display device or a tiled antenna joint device, but the present disclosure is not limited thereto. It is noteworthy that the electronic device may be any variants, arrangements or combinations of the above, but the present disclosure is not limited thereto. In addition, the term “bendable” or “flexible” referred in the present disclosure may mean the electronic device may be bent, bended, folded, stretched, flexed or other similar deformations. In the present disclosure, the term “non-rectangular” means the appearance of the electronic device may be non-rectangular, or the pixel array of the electronic device may include a non-rectangular overall appearance. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the disclosure. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.