Patent Publication Number: US-11644935-B2

Title: Touch panel having second conductive layer and touch display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application is a continuation application of U.S. application Ser. No. 16/958,964, filed on Jun. 29, 2020, which is a national stage of International Application No. PCT/CN2019/098680, filed on Jul. 31, 2019, all of which are hereby incorporated by reference in their entireties for all purposes. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of touch, and more particularly, relates to a touch panel and a touch display panel. 
     BACKGROUND 
     With the development of touch technology, touch panels are increasingly applied to electronic products such as touch screen mobile phones or tablet computers. 
     SUMMARY 
     Embodiments of the present disclosure provide a touch panel and a touch display panel. The technical solutions are as follows: 
     In a first aspect, a touch panel is provided. The touch panel includes: a base substrate, and a first conductive layer, an insulation layer, and a second conductive layer that are sequentially arranged along a direction away from the base substrate; wherein 
     the first conductive layer includes: a first touch electrode, a second touch electrode, a third touch electrode, a fourth touch electrode, a first connection electrode, and a second connection electrode; the first connection electrode is in an annular shape, and surrounds the second connection electrode, the first touch electrode, and the second touch electrode are disposed on both sides of the first connection electrode in a first direction, the third touch electrode and the fourth touch electrode are disposed on both sides of the first connection electrode in a second direction, and an included angle between the first direction and the second direction being greater than zero; 
     the insulation layer includes: two first insulation pads, two second insulation pads, two third insulation pads, and two fourth insulation pads; wherein one end of each of the two first insulation pads is overlapped onto the first touch electrode, and the other end of each of the two first insulation pads is overlapped onto the first connection electrode; one end of each of the two second insulation pads is overlapped onto the second touch electrode, and the other end of each of the two second insulation pads is overlapped onto the first connection electrode; one end of each of the two third insulation pads is overlapped onto the third touch electrode, and the other end of each of the two third insulation pads spans the first connection electrode and is overlapped onto the second connection electrode; one end of each of the two fourth insulation pads is overlapped onto the fourth touch electrode, and the other end of each of the two fourth insulation pads spans the first connection electrode and is overlapped onto the second connection electrode; 
     the second conductive layer includes: two first conductive bridges, two second conductive bridges, two third conductive bridges, and two fourth conductive bridges; wherein the two first conductive bridges one-to-one correspond to the two first insulation pads, each of the first conductive bridges is disposed on the corresponding first insulation pad, and both ends of each of the first conductive bridges are electrically connected to the first touch electrode and the first connection electrode respectively; the two second conductive bridges one-to-one correspond to the two second insulation pads, each of the second conductive bridges is disposed on the corresponding second insulation pad, and both ends of each of the second conductive bridges are electrically connected to the second touch electrode and the first connection electrode respectively; the two third conductive bridges one-to-one correspond to the two third insulation pads, each of the third conductive bridges is disposed on the corresponding third insulation pad, and both ends of each of the third conductive bridges are electrically connected to the third touch electrode and the second connection electrode respectively; and the two fourth conductive bridges one-to-one correspond to the two fourth insulation pads, each of the fourth conductive bridges is disposed on the corresponding fourth insulation pad, and both ends of each of the fourth conductive bridges are electrically connected to the fourth touch electrode and the second connection electrode respectively. 
     Optionally, an orthographic projection of the first connection electrode on the base substrate is in the shape of an octagonal ring; an orthographic projection of the second connection electrode on the base substrate is in the shape of an octagon, and eight inner edges in the octagonal ring are parallel to eight edges of the octagon in one-to-one correspondence. 
     Optionally, a ring width of the first connection electrode in the first direction is greater than a ring width of the first connection electrode in the second direction; 
     a maximum length of the first connection electrode in the first direction is greater than a maximum length of the first connection electrode in the second direction; and 
     a maximum length of the second connection electrode in the first direction is less than a maximum length of the second connection electrode in the second direction. 
     Optionally, the octagon has a first symmetry axis and a second symmetry axis, the first symmetry axis being parallel to the first direction, and the second symmetry axis being parallel to the second direction; 
     the two first conductive bridges are symmetrical with respect to the first symmetry axis, the two second conductive bridges are symmetrical with respect to the first symmetry axis, and the two first conductive bridges and the two second conductive bridges are symmetrical with respect to the second symmetry axis; and 
     the two third conductive bridges are symmetrical with respect to the second symmetry axis, the two fourth conductive bridges are symmetrical with respect to the second symmetry axis, and the two third conductive bridges and the two fourth conductive bridges are symmetrical with respect to the first symmetry axis. 
     Optionally, the two first conductive bridges and the two second conductive bridges are all in a striped shape and perpendicular to an outer edge of the respectively connected octagonal ring, and four outer edges that are perpendicular to the two first conductive bridges and the two second conductive bridges respectively are different; 
     the two third conductive bridges and the two fourth conductive bridges are both in a fold line shape, and each of the two third conductive bridges and the two fourth conductive bridges includes two conductive strips; a length of the conductive strip is e, an angle between the two conductive strips is θ, 
     
       
         
           
             
               
                 
                   
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     wherein a distance between the first connection electrode and the second connection electrode is d, a distance between the first connection electrode and the third touch electrode is d, a distance between the first connection electrode and the fourth touch electrode is d, a minimum ring width of the first connection electrode is c, a length of the third insulation pad in a corresponding third direction is f, and a length of the fourth insulation pad in a corresponding fourth direction is f; the third direction corresponding to the third insulation pad is perpendicular to a direction of the third touch electrode overlapped by the third insulation pad toward the second connection electrode, and the fourth direction corresponding to the fourth insulation pad is perpendicular to a direction of the fourth touch electrode overlapped by the fourth insulation pad toward the second connection electrode. 
     Optionally, opening directions of bending angles of the two third conductive bridges are opposite, and opening directions of the bending angles of the two fourth conductive bridges are opposite. 
     Optionally, the two first conductive bridges, the two second conductive bridges, the two third conductive bridges, and the two fourth conductive bridges are all in a striped shape, and perpendicular to an outer edge of the respectively connected octagonal ring, and eight outer edges that are perpendicular to the two first conductive bridges, the two second conductive bridges, the two third conductive bridges, and the two fourth conductive bridges respectively are different; 
     lengths of the two third conductive bridges and the two fourth conductive bridges are all greater than 2d+c; 
     wherein a distance between the first connection electrode and the second connection electrode is d, a distance between the first connection electrode and the third touch electrode is d, a distance between the first connection electrode and the fourth touch electrodes is d, a the minimum ring width of the first connection electrode is c. 
     Optionally, for the two first conductive bridges, the two second conductive bridges, the two third conductive bridges and the two fourth conductive bridges, a distance between the two ends of each conductive bridge is less than 220 microns, and a width of each conductive bridge is less than 20 microns. 
     Optionally, the distance between the two ends of each conductive bridge is less than 110 microns. 
     Optionally, the width of each conductive bridge is less than 15 microns. 
     Optionally, the first conductive layer further includes: auxiliary electrodes disposed between each two adjacent electrodes of the first touch electrode, the second touch electrode, the third touch electrode and the fourth touch electrode; and 
     a gap is defined between any two electrodes of the auxiliary electrodes, the first touch electrode, the second touch electrode, the third touch electrode, and the fourth touch electrode. 
     Optionally, two auxiliary electrodes are disposed between each two adjacent electrodes; and 
     the auxiliary electrode is in a trapezoidal shape, and a side of the lower bottom of each of the two auxiliary electrodes faces the other auxiliary electrode. 
     Optionally, a material of each of the two first conductive bridges, the two second conductive bridges, the two third conductive bridges, and the two fourth conductive bridges includes metal. 
     In a second aspect, a touch display panel is provided. The touch display panel includes a display panel, and the touch panel as defined in the first aspect; wherein a base substrate in the touch panel is an encapsulation layer in the display panel. 
     In a third aspect, a touch display panel is provided. The touch display panel includes a display panel, and the touch panel as defined in the first aspect; wherein the touch panel is disposed on a light emitting side of the display panel. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure. 
         FIG.  2    is a schematic structural diagram of another touch panel according to an embodiment of the present disclosure. 
         FIG.  3    is a schematic structural diagram of a conductive bridge according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     For clearer descriptions of the principles, technical solutions and advantages in the present disclosure, the present disclosure is described in detail below in combination with the accompanying drawings. 
     As known by inventor, the touch panel generally includes a base substrate, and a plurality of touch electrodes and a plurality of conductive bridges on the base substrate. The plurality of touch electrodes in the touch panel are arranged in multiple rows and columns, and in either of row direction or column direction of the touch electrodes, adjacent touch electrodes are electrically connected by the conductive bridges. 
       FIG.  1    is a schematic structural diagram of a touch panel according to an embodiment of the present disclosure. As shown in  FIG.  1   , the touch panel includes: a base substrate  01 , and a first conductive layer  02 , an insulation layer  03 , and a second conductive layer  04  that are arranged sequentially along a direction away from the base substrate  01 . 
     The first conductive layer  02  includes: a first touch electrode  021 , a second touch electrode  022 , a third touch electrode  023 , a fourth touch electrode  024 , a first connection electrode  025 , and a second connection electrode  026 . The first connection electrode  025  is in an annular shape, and surrounds the second connection electrode  026 . The first touch electrode  021  and the second touch electrode  022  are disposed on both sides of the first connection electrode  025  in a first direction x, and the third touch electrode  023  and the fourth touch electrode  024  are disposed on both sides of the first connection electrode  025  in a second direction y. An included angle between the first direction x and the second direction y is greater than zero. For example, the angle between the first direction x and the second direction y is 90 degrees in  FIG.  1   . Of course, the angle between the first direction x and the second direction y may be other degrees greater than zero, for example, 80 degrees. 
     The insulation layer  03  includes: two first insulation pads  031 , two second insulation pads  032 , two third insulation pads  033 , and two fourth insulation pads  034 . One end of each of the two first insulation pads  031  is overlapped onto the first touch electrode  021 , and the other end of each of the two first insulation pads is overlapped onto the first connection electrode  025 . One end of each of the two second insulation pads  032  is overlapped onto the second touch electrode  022 , and the other end of each of two second insulation pads is overlapped onto the first connection electrode  025 . One end of each of the two third insulation pads  033  is overlapped onto the third touch electrode  023 , and the other end of each of the two third insulation pads spans the first connection electrode  025  and is overlapped onto the second connection electrode  026 . One end of each of the two fourth insulation pads  034  is overlapped onto the fourth touch electrode  024 , and the other end of each of the two fourth insulation pads spans the first connection electrode  025  and is overlapped onto the second connection electrode  026 . 
     The second conductive layer  04  includes: two first conductive bridges  041 , two second conductive bridges  042 , two third conductive bridges  043 , and two fourth conductive bridges  044 . The two first conductive bridges  041  one-to-one correspond to the two first insulation pads  031 , each of the first conductive bridges  041  is disposed on the corresponding first insulation pad  031 , and both ends of each of the first conductive bridges  041  are electrically connected to the first touch electrode  021  and the first connection electrode  025  respectively. The two second conductive bridges  042  one-to-one correspond to the two second insulation pads  032 , each of the second conductive bridges  042  is disposed on the corresponding second insulation pad  032 , and both ends of each of the second conductive bridges  042  are electrically connected to the second touch electrode  022  and the first connection electrode  025  respectively. The two third conductive bridges  043  one-to-one correspond to the two third insulation pads  033 , each of the third conductive bridges  043  is disposed on the corresponding third insulation pad  033 , and both ends of each of the third conductive bridges  043  are electrically connected to the third touch electrode  023  and the second connection electrode  026  respectively. The two fourth conductive bridges  044  one-to-one correspond to the two fourth insulation pads  034 , each of the fourth conductive bridges  044  is disposed on the corresponding fourth insulation pad  034 , and both ends of each of the fourth conductive bridges  044  are electrically connected to the fourth touch electrode  024  and the second connection electrode  026  respectively. 
     As shown in  FIG.  1   , in the embodiment of the present disclosure, the first touch electrode  021 , the first connection electrode  025 , and the second touch electrode  022  are electrically connected in sequence to form an electrode extending along the first direction x. The third touch electrode  023 , the second connection electrode  026 , and the fourth touch electrode  024  are electrically connected in sequence to form an electrode extending along the second direction y. Besides, the electrode extending along the first direction x and the electrode extending along the second direction y intersect with each other. The touch panel may be a mutual-capacitance touch panel. 
     In summary, the embodiment of the present disclosure provides a brand-new touch panel. The touch panel has a different structure from a touch panel in the related art. Therefore, the structure of the touch panel is enriched. 
     Optionally, with continued reference to  FIG.  1   , an orthographic projection of the first connection electrode  025  on the base substrate  01  is in the shape of an octagonal ring. The orthographic projection of the second connection electrode  026  on the base substrate  01  is in the shape of an octagon, and eight inner edges B 1  in the octagonal ring are parallel to eight edges B 2  of the octagon in one-to-one correspondence. In  FIG.  1   , only one inner edge and one edge of the octagon are marked. 
     Optionally, a ring width w of the first connection electrode  025  in the first direction x is greater than a ring width c of the first connection electrode  025  in the second direction y. A maximum length L 1  of the first connection electrode  025  in the first direction x is greater than a maximum length L 2  of the first connection electrode  025  in the second direction y. A maximum length L 3  of the second connection electrode  026  in the first direction x is less than a maximum length L 4  of the second connection electrode  026  in the second direction y. 
     Optionally, the above octagon has a first symmetry axis D 1  and a second symmetry axis D 2 . The first symmetry axis D 1  is parallel to the first direction x, and the second symmetry axis D 2  is parallel to the second direction y. The two first conductive bridges  041  are symmetrical about the first symmetry axis D 1 , the two second conductive bridges  042  are symmetrical with respect to the first symmetry axis D 1 , and the two first conductive bridges  041  and the two second conductive bridges  042  are symmetrical with respect to the second symmetry axis D 2 . The two third conductive bridges  043  are symmetrical with respect to the second symmetry axis D 2 , the two fourth conductive bridges  044  are symmetrical with respect to the second symmetry axis D 2 , and the two third conductive bridges  043  and the two fourth conductive bridges  044  are symmetrical with respect to the first symmetry axis D 1 . In this way, the conductive bridges in the touch panel are symmetrically distributed, and the distribution of the conductive bridges is relatively uniform, thereby reducing the visibility of the conductive bridges. 
     Optionally, the two first conductive bridges  041  and the two second conductive bridges  042  are all in a striped shape, and perpendicular to an outer edge B 3  of the respectively connected octagonal ring, and four outer edges B 3  that are perpendicular to the two first conductive bridges  041  and the two second conductive bridges  042  respectively are different (only one outer edge B 3  is marked in  FIG.  1   ). Optionally, a length of the first conductive bridge  041  is greater than a length of the first insulation pad  031  in the length direction of the first conductive bridge  041 , and a length of the first insulation pad  031  in the length direction of the first conductive bridge  041  is greater than a width of a gap between the first conductive bridge  041  and the first connection electrode  025 . Similarly, a length of the second conductive bridge  042  is greater than a length of the second insulation pad  032  in the length direction of the second conductive bridge  042 , and a length of the second insulation pad  032  in the length direction of the second conductive bridge  042  is greater than a width of a gap between the second conductive bridge  042  and the first connection electrode  025 . 
     The two third conductive bridges  043  and the two fourth conductive bridges  044  are all in a fold line shape, and each of the two third conductive bridges  043  and the two fourth conductive bridges  044  includes two conductive strips  051 . A length of the conductive strip  051  is e, an angle between the two conductive strips  051  is 
             θ   ,           2   ⁢   d     +   c       2   ⁢   sin   ⁢     θ   2         &lt;   e   &lt;     100   ⁢   um       ,         
and
 
               2   ⁢           ⁢     tan     -   1       ⁢         2   ⁢   d     +   c     f       &lt;   θ   &lt;     π   .           
A distance between the first connection electrode  025  and the second connection electrode  026  is d, a distance between the first connection electrode  025  and the third touch electrode  023  is d, a distance between the first connection electrode  025  and the fourth touch electrode  024  is d, a minimum ring width of the first connection electrode  025  is c, a length of the third insulation pad  033  in a corresponding third direction is f, and a length of the fourth insulation pad  034  in a corresponding fourth direction is f. The third direction corresponding to the third insulation pad  033  is perpendicular to a direction of the third touch electrode  023  overlapped by the third insulation pad  033  toward the second connection electrode  026 , and the fourth direction corresponding to the fourth insulation pad  034  is perpendicular to a direction of the fourth touch electrode  024  overlapped by the fourth insulation pad  34  toward the second connection electrode  026 .
 
     Optionally, with continued reference to  FIG.  1   , opening directions of bending angles (for example, the bending angle m and bending angle n in  FIG.  1   ) of the two third conductive bridges  043  are opposite. Opening directions of the bending angles (for example, the bending angle p and bending angle θ in  FIG.  1   ) of the two fourth conductive bridges  044  are opposite. In this way, the conductive bridges in the touch panel are not all regularly arranged in the same direction, thereby reducing the visibility of the conductive bridges. 
     It should be noted that the third conductive bridges  043  and the fourth conductive bridges  044  are all in the fold line shape in  FIG.  1   . Optionally, the third conductive bridges  043  and the fourth conductive bridges  044  may also be in a striped shape. 
     Illustratively,  FIG.  2    is a schematic structural diagram of another touch panel according to an embodiment of the present disclosure. As shown in  FIG.  2   , the two first conductive bridges  041 , the two second conductive bridges  042 , the two third conductive bridges  043 , and the two fourth conductive bridges  044  are all in a striped shape, and perpendicular to an outer edge B 3  of the respectively connected octagonal ring (the first connection electrode  25 ). Eight outer edges B 3  that are perpendicular to the two first conductive bridges  041 , the two second conductive bridges  042 , the two third conductive bridges  043  and the two fourth conductive bridges  044  respectively are different. Lengths of the two third conductive bridges  043  and the two fourth conductive bridges  044  are all greater than 2d+c. The distance between the first connection electrode and the second connection electrode is d, the distance between the first connection electrode and the third touch electrode is d, the distance between the first connection electrode and the fourth touch electrodes is d, and the minimum ring width of the first connection electrode is c. 
     Optionally, the length of the first conductive bridge  041  is greater than the length of the first insulation pad  031  in the length direction of the first conductive bridge, and the length of the first insulation pad  031  in the length direction of the first conductive bridge is greater than the length of the gap between the first conductive bridge  041  and the first connection electrode  025 . Similarly, the length of the second conductive bridge  042  is greater than the length of the second insulation pad  032  in the length direction of the second conductive bridge, and the length of the second insulation pad  032  in the length direction of the second conductive bridge is greater than the width of the gap between the second conductive bridge  042  and the first connection electrode  025 . 
     In addition, regardless of the shapes of the two first conductive bridges, two second conductive bridges, two third conductive bridges, and two fourth conductive bridges (for example, the shape shown in  FIG.  1    or  FIG.  2   ), as shown in  FIG.  3   , a distance L 1  between the two ends of each of these conductive bridges is less than 220 microns, and a width L 2  of each conductive bridge is less than 20 microns. It should be noted that in  FIG.  3   , only the strip-shaped conductive bridge is used as an example. 
     In the touch panel according to the embodiment of the present disclosure, the distance between the two ends of the conductive bridge is less than 220 microns, and the width of the conductive bridge is less than 20 microns. However, in the related art, the distance between the two ends of the conductive bridge is greater than 220 microns, and the width of the conductive bridge is greater than 20 microns. A smaller distance between the two ends of the conductive bridge indicates a lower visibility of the conductive bridge a smaller width of the conductive bridge and a lower visibility of the conductive bridge. Therefore, in the embodiment of the present disclosure, the visibility of the conductive bridge can be reduced by reducing at least one of the distance between the two ends of at least part of the conductive bridge and the width of the conductive bridge, thereby reducing the shadow of the conductive bridge. 
     Optionally, the distance between the two ends of each conductive bridge is less than 110 microns, 100 microns, or the like. When the distance between the two ends of the conductive bridge is less than 110 microns or less than 100 microns, the distance between the two ends of the conductive bridge is further reduced, thereby further reducing the visibility of the conductive bridge. Optionally, the width of each conductive bridge is less than 15 microns, 10 microns, or the like. When the width L 2  of the conductive bridge is less than 10 microns or 15 microns, the width of the conductive bridge is further reduced, thereby further reducing the visibility of the conductive bridge. 
     Optionally, a materials of each of the two first conductive bridges  041 , the two second conductive bridges  042 , the two third conductive bridges  043 , and the two fourth conductive bridges  044  includes metal. It should be noted that the conductive bridge  03  in the embodiment of the present disclosure may be light-shielding or transparent. When the conductive bridge  03  is light-shielding, the material of the conductive bridge  03  may be metal or other light-shielding conductive materials (for example graphene). When the conductive bridge  03  is transparent, the material of the conductive bridge  03  may be indium tin oxide or other transparent conductive materials (for example, indium zinc oxide). In addition, when the material of the conductive bridge  03  is metal, since the impedance of the metal is smaller, the conductive effect of the conductive bridge  03  is better. 
     With continued reference to  FIG.  1    or  FIG.  2   , regardless of the shape of the conductive bridge, the first conductive layer  02  further includes auxiliary electrodes  027  disposed between each two adjacent electrodes of the first touch electrode  021 , the second touch electrode  022 , the third touch electrode  023 , and the four touch electrode  024 . In addition, a gap J is defined between any two electrodes of the auxiliary electrodes  027 , the first touch electrode  021 , the second touch electrode  022 , the third touch electrode  023 , and the fourth touch electrode  024 . 
     Optionally, two auxiliary electrodes  027  are disposed between each two adjacent electrodes of the first touch electrode  021 , the second touch electrode  022 , the third touch electrode  023 , and the fourth touch electrode  024 . Besides, the auxiliary electrode  027  is in a trapezoidal shape, and a side of the lower bottom of each of the two auxiliary electrodes  027  faces the other auxiliary electrode  027 . 
     Optionally, the trapezoidal height of the auxiliary electrode  027  may be less than 30 microns. It can be seen that the trapezoidal height is smaller. Therefore, the visibility of the auxiliary electrode  027  can be reduced. 
     In addition, the touch panel shown in  FIG.  1    and  FIG.  2    may include a plurality of touch electrodes arranged in an array. These touch electrodes include the first touch electrode, the second touch electrode, the third touch electrode, and the fourth touch electrode. The touch panel may further include a plurality of first connection lines  071  corresponding to multiple rows of touch electrodes in one-to-one correspondence, and a plurality of second connection lines  072  corresponding to multiple columns of touch electrodes in one-to-one correspondence. One touch electrode in each row of touch electrodes is electrically connected to the first connection line  071  corresponding to the row of touch electrodes, and one touch electrode in each column of touch electrodes is electrically connected to the second connection line  072  corresponding to the column of touch electrodes. 
     By the first connection lines and the second connection lines, electrical signals can be applied to the touch electrodes connected to the connection lines, and the electrical signals on the touch electrodes can be collected to detect the touch position. Exemplarily, during detection of the touch position, a driving electrical signal may be applied to multiple columns of touch electrodes by the plurality of second connection lines in sequence. Every time the driving electrical signal is applied to one column of touch electrodes, the induced electrical signals on multiple rows of touch electrodes are collected by the plurality of first connection lines. After the driving electrical signal is applied to the p th  column of touch electrodes, the induced electrical signals collected from the q th  row of touch electrodes are not preset electrical signals. When the induced electrical signals collected from other rows of touch electrodes are all preset electrical signals, it can be determined that the intersection position of the p th  column of touch electrodes and the q th  row of touch electrodes is the touch position, in which p is equal or greater than land q is equal or greater than 1. 
     In summary, the embodiment of the present disclosure provides a brand-new touch panel. The touch panel has a different structure from the touch panel in the related art. Therefore, the structure of the touch panel is enriched. 
     Moreover, in the touch panel according to the embodiment of the present disclosure, the distance between the two ends of the conductive bridge is less than 220 microns, and the width of the conductive bridge is less than 20 microns. However, in the related art, the distance between the two ends of the conductive bridge is greater than 220 microns, and the width of the conductive bridge is greater than 20 microns. A smaller distance between the two ends of the conductive bridge indicates a lower visibility of the conductive bridge, a smaller width of the conductive bridge and a lower visibility of the conductive bridge. Therefore, in the embodiment of the present disclosure, the visibility of the conductive bridge can be reduced by reducing the distance between the two ends of the conductive bridge and the width of the conductive bridge, thereby reducing the shadow of the conductive bridge. 
     The embodiment of the present disclosure also provides a touch display panel. The touch display panel may include a display panel, and any touch panel according to the embodiment of the present disclosure (for example, the touch panel shown in  FIG.  1    or  FIG.  2   ). Exemplarily, the touch panel may be disposed on a light emitting side of the display panel; or, the base substrate in the touch panel is an encapsulation layer in the display panel. 
     Further, the above touch display panel may be any product or component having a touch display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. 
     It should be noted that in the accompanying drawings, for clarity of the illustration, the dimension of the layers and areas may be scaled up. It may be understood that when an element or layer is described as being “above” another element or layer, the described element or layer may be directly on the other element or layer, or at least one intermediate layer may be arranged between the described element or layer and the other element or layer. In addition, It may be understood that when an element or layer is described as being “below” another element or layer, the described element or layer may be directly below the other element or layer, or at least one intermediate layer may be arranged between the described element or layer and the other element or layer. In addition, it may be further understood that when a layer or element is described as being arranged “between” two layers or elements, the described layer or element may be the only layer between the two layers or elements, or at least one intermediate layer or element may be arranged between the described element or layer and the two layers or elements. In the whole specification described above, like reference numerals denote like elements. 
     In the present disclosure, the terms such as “first”, “second”, “third”, and “fourth” are merely for a descriptive purpose, and cannot be understood as indicating or implying a relative importance. The term “a plurality of” means two or more in number, unless otherwise defined. 
     The foregoing descriptions are merely optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Within the spirit and principles of the disclosure, any modifications, equivalent substitutions, improvements, or the like are within the protection scope of the present disclosure.