Patent Publication Number: US-2023144469-A1

Title: Display panel and display device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims to the benefit of Chinese Patent Application No. 202211086331.2, filed on, Sep. 6, 2022, the content of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device. 
     BACKGROUND 
     Conventionally, in order to pursue a narrow frame to improve a user’s visual experience, technical solutions such as a water-drop screen, a notch screen, and a hole-digging screen have emerged. The hole-digging screen is manufactured by forming a hole in the display region, and then an optical device is arranged in the hole when assembling a display module. The forming of the hole results in poor symmetry of the display region, which affects the display effect. 
     SUMMARY 
     The embodiments of the present disclosure provide a display panel and a display device, aiming to improve the overall symmetry of the display region. 
     In a first aspect, the present disclosure provides a display panel. In an embodiment, the display panel has a display region and a non-display region, and comprises: a first through-hole, a second through-hole, and a third through-hole that are arranged along a first direction in the display region. In an embodiment, the non-display region comprises a first non-display region and a second non-display region. In an embodiment, the first non-display region surrounds the first through-hole and the second through-hole, and the second non-display region surrounds the third through-hole. In an embodiment, the first non-display region and the second non-display region are spaced from each other. In an embodiment, a minimum distance d 1  between the first through-hole and the second through-hole in a first direction and a minimum distance d 2  between the second through-hole and the third through-hole in the first direction satisfy: d 1 &lt;d 2 . The display region has a symmetry axis extending along a second direction, the second direction intersecting the first direction. In an embodiment, the symmetry axis overlaps with the second through-hole or is located between the second through-hole and the third through-hole. 
     In a second aspect, the present disclosure provides a display device including a display panel. In an embodiment, the display panel has a display region and a non-display region, and comprises: a first through-hole, a second through-hole, and a third through-hole that are arranged along a first direction in the display region. In an embodiment, the non-display region comprises a first non-display region and a second non-display region. In an embodiment, the first non-display region surrounds the first through-hole and the second through-hole, and the second non-display region surrounds the third through-hole. In an embodiment, the first non-display region and the second non-display region are spaced from each other. In an embodiment, a minimum distance d 1  between the first through-hole and the second through-hole in a first direction and a minimum distance d 2  between the second through-hole and the third through-hole in the first direction satisfy: d 1 &lt;d 2 . In an embodiment, the display region has a symmetry axis extending along a second direction, the second direction intersecting the first direction. The symmetry axis overlaps with the second through-hole or is located between the second through-hole and the third through-hole. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the present disclosure or in the related art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the related art. The accompanying drawings in the following description show some embodiments of the present disclosure, and a person skilled in the art can still derive other drawings from these accompanying drawings. 
         FIG.  1    is a partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  2    is another schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  3    is another schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  4    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  5    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  6    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  7    is a cross-sectional view along A-A′ shown in  FIG.  6    according to an embodiment of the present disclosure; 
         FIG.  8    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  9    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  10    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  11    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  12    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  13    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  14    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  15    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  16    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  17    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  18    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  19    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  20    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  21    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  22    is a cross-sectional view along B-B′ shown in  FIG.  21    according to an embodiment of the present disclosure; 
         FIG.  23    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  24    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  25    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  26    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; 
         FIG.  27    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure; and 
         FIG.  28    is a schematic diagram of a display device according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. The described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure shall fall within the protection scope of the present disclosure. 
     Terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. Unless otherwise specified in the context, words, such as “a”, “the”, and “this”, in a singular form in the embodiments of the present disclosure and the appended claims include plural forms. 
     Some embodiments of the present disclosure provide a display panel. Three through-holes are formed in a display region of the display panel. The display panel includes multiple layers that are stacked. The through-hole penetrates through at least one of the layers of the display panel. No pixels are provided in the region where the through-holes are arranged, and thus this region cannot display an image normally. Some functional devices, such as photosensitive devices (such as cameras), can be arranged in the region where the through-holes are arranged, so that there is no need to arrange these devices at a frame of the display panel, which can reduce the width of the frame of the display panel. In the embodiments of the present disclosure, the relative positions of the three through-holes are designed to improve the overall symmetry of the region capable of displaying images with the through-holes, to improve the display effect. 
       FIG.  1    is a partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments of the present disclosure, as shown in  FIG.  1   , the display panel has a display region AA and a non-display region. The display panel includes a first through-hole K 1 , a second through-hole K 2 , and a third through-hole K 3  that are arranged in the display region AA in a first direction x. The non-display region includes a first non-display region NA 1  and a second non-display region NA 2 , the first non-display region NA 1  surrounds the first through-hole K 1  and the second through-hole K 2 , and the second non-display region NA 2  surrounds the third through-hole K 3 . The first non-display region NA 1  and the second non-display region NA 2  are not connected to each other, which indicates that there is a region capable of displaying images between the second through-hole K 2  and the third through-hole K 3 . A minimum distance d 1  between the first through-hole K 1  and the second through-hole K 2  in the first direction x, and a minimum distance d 2  between the second through-hole K 2  and the third through-hole K 3  satisfy: d 1 &lt;d 2 . A shape of each through-hole in  FIG.  1    is illustrated as a circle. In other embodiments, the shape of each through-hole can be other shape, such as a rectangle, or an ellipse. Since the first non-display region NA 1  surrounds two through-holes, a length of a region where the first non-display region NA 1 , the first through-hole K 1  and the second through-hole K 2  are located in the first direction is different from a length of the region where the first non-display region NA 1 , the first through-hole K 1  and the second through-hole K 2  are located in the second direction. The second direction y intersects with the first direction x. As shown in  FIG.  1   , the display region AA has a symmetry axis Z extending along the second direction y, and the symmetry axis Z overlaps with the second through-hole K 2 . In other embodiments, the symmetry axis Z is located between the second through-hole K 2  and the third through-hole K 3 . In some embodiments, the symmetry axis Z is located in a region of the display region that is located between the second through-hole K 2  and the third through-hole K 3 . That is, the symmetry axis Z is located near the second through-hole K 2 . 
     In the display panel provided by the embodiments of the present disclosure, the display panel includes three through-holes arranged along the first direction x in the display region AA, and the symmetry axis Z of the display region AA in the second direction y is located near the second through-hole K 2 , a region between the first through-hole K 1  and the second through-hole K 2  is configured as a non-display region, and d 1 &lt;d 2 , which can make the arrangement of the first through-hole K 1  and the second through-hole K 2  relatively compact, thereby reducing an area of the non-display region where the first through-holes K 1  and the second through-holes K 2  are located, and improving an overall symmetry of the region capable of displaying images with the through-holes. 
     In the embodiments of the present disclosure, a non-display region having a certain area is located between the first through-hole K 1  and the second through-hole K 2 , so that some circuit wires can be arranged therein. The first non-display region NA 1  and the second non-display region NA 2  are not connected to each other, so that a display region having a certain area is located between the second through-hole K 2  and the third through-hole K 3 . The d 1  is the minimum distance of the non-display region located between the first through-hole K 1  and the second through-hole K 2  in the first direction x, and the d 2  includes a width of the first non-display region NA 1  located at a side of the second through-hole K 2  in the first direction x, a width of the second non-display region NA 2  located at a side of the third through-hole K 3  in the first direction, and a width of the display region located between the second through-hole K 2  and the third through-hole K 3  in the first direction. 
     As shown in  FIG.  1   , the second through-hole K 2  has a first edge B 1  close to the third through-hole K 3 , and the third through-hole K 3  has a second edge B 2  close to the second through-hole K 2 . In the first direction x, a minimum distance from the first edge B 1  to the symmetry axis Z is smaller than a minimum distance from the second edge B 2  to the symmetry axis Z. With such a configuration, the symmetry axis Z can be arranged near the second through-hole K 2 , which improves an overall symmetry of the region capable of displaying images with the through-holes. 
       FIG.  2    is a schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  2   , the display region AA has a first virtual straight line X 1  and a second virtual straight line X 2  each extending along the second direction y, an edge of the first through-hole K 1  that is closest to the second through-hole K 2  in the first direction x intersects with the first virtual straight line X 1 , and an edge of the second through-hole K 2  that is closest to the first through-hole K 1  in the first direction x intersects with the second virtual straight line X 2 . The display region AA includes a middle region AAZ, which is a region of the display panel located between the first virtual straight line X 1  and the second virtual straight line X 2 . 
     The display region AA includes a first display region AA 1 , a second display region AA 2 , and a third display region AA 3 . In the second direction y, two first display regions AA 1  are respectively located at two sides of the first through-hole K 1 , two second display regions AA 2  are respectively located at two sides of the second through-hole K 2 , and two third display regions AA 3  are respectively located at two sides of the third through-hole K 3 . The first virtual straight line X 1  is a virtual boundary between the first display region AA 1  and the middle region AAZ, and the second virtual straight line X 2  is a virtual boundary between the second display region AA 2  and the middle region AAZ. 
     The display panel includes a first signal line  12 , a second signal line  13 , and a third signal line  14  that each extend along the second direction y. At least one of the first signal lines  12  is located in the first display region AA 1 , and at least one of the second signal lines  13  is located in the second display region AA 2 , and the third signal line  14  is located in the third display region AA 3 . 
     The display panel includes a first wound line  41 , a second wound line  42 , and a third wound line  43 . The first signal lines  12  respectively located at two sides of the first through-hole K 1  are connected to each other by the first wound line  41 , the second signal lines  13  respectively located at two sides of the second through-hole K 2  are connected to each other by the second wound line  42 , and the third signal lines  14  respectively located at two sides of the third through-hole K 3  are connected to each other by the third wound line  43 . 
     As shown in  FIG.  2   , the first wound line  41  and the second wound line  42  are located in the first non-display region NA 1 , and the third wound line  43  is located in the second non-display region NA 2 . In the first non-display region NA 1 , the first wound line  41  extends along the edge of the first through-hole K 1 , and the second wound line  42  extends along the edge of the second through-hole K 2 . In the second non-display region NA 2 T, the third wound line  43  extends along the edge of the third through-hole K 3 . 
     In certain embodiments, in the second direction y, the first display region AA 1  corresponds to the first through-hole K 1 , the second display region AA 2  corresponds to the second through-hole K 2 , and the third display region AA 3  corresponds to the third through-hole K 3 . Then, in the second direction y, the first signal line  12  corresponds to the first through-hole K 1 , the second signal line  13  corresponds to the second through-hole K 2 , and the third signal line  14  corresponds to the third through-hole K 3 . The first wound line  41 , the second wound line  42 , and the third wound line  43  are respectively wound in the non-display region near the through-holes, in such a manner that the signal lines in the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , which are disconnected by the through-holes, are connected in a same way. In this way, the brightness difference between the first display region AA 1 , the second display region AA 2 , and the third display region AA 3  can be reduced. Thus, a display split screen phenomenon at two sides of the symmetry axis Z can be avoided. 
       FIG.  3    is another schematic diagram of a display panel according to some embodiments of the present disclosure. In some other embodiments, as shown in  FIG.  3   , the first wound line  41 , the second wound line  42 , and the third wound line  43  are all located in the display region AA. The first wound line  41  is wound at a side of the first through-hole K 1  away from the second through-hole K 2 , and the second wound line  42  is wounded in a region of the display region AA that is between the second through-hole K 2  and the third through-hole K 3 . At least one of the third wound lines  43  is wound in a region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3 , and at least another third wound line  43  of the third wound lines  43  is located in another region of the display region AA that is located at a side of the third through-hole K 3  away from the second through-hole K 2 . In an embodiment, the wound lines each connecting two signal lines that are respectively located at two sides of each of the through-holes are all arranged in the display region AA, so that the width of the frame of the non-display region around each through-hole can be reduced. The signal lines in the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , which are disconnected by the through-holes, are connected in a same way. In this way, the brightness difference between the first display region AA 1 , the second display region AA 2 , and the third display region AA 3  can be reduced, and the display split screen phenomenon at two sides of the symmetry axis Z can be avoided. 
     In an embodiment of the present disclosure, the signal lines in the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , which are disconnected by the through-holes, are connected in a same way. In this way, the brightness difference between the first display region AA 1 , the second display region AA 2 , and the third display region AA 3  can be reduced. Since the middle region AAZ exists between the first display region AA 1  and the second display region AA 2 , a middle stripe will be generated in the display region AA (generated by the middle region AAZ) due to a display difference between the middle region AAZ and each of the first display region AA 1  and the second display region AA 2 , thereby causing the split screen display. Therefore, how to connect the signal lines that are disconnected in the middle region AAZ is also a technical problem to be solved. 
     In some embodiments, as shown in  FIG.  2   , the display panel includes a fourth signal line  11  extending along the second direction y, and the fourth signal line  11  is located in the middle region AAZ. The display panel includes a connection line  20  including a first connection line  21 , and each of two ends of the first connection line  21  is connected to one of the fourth signal lines  11  located in the middle region AAZ located at two sides of the first non-display region NA 1 . The first connection line  21  is located between the first through-hole K 1  and the second through-hole K 2 . In certain embodiments, the connection mode of the signal line in the middle region AAZ that are disconnected by the through-hole is designed, and the first connection line  21  is used to connect the fourth signal lines in the middle regions AAZ that are located at two sides of the first non-display region NA 1 . The connection mode of the fourth signal lines  11  in the middle regions AAZ that are respectively located at two sides of the first non-display region NA 1  will not affect the connection mode of the signal lines in the display region AA corresponding to each through-hole, so that the signal lines in the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , which are disconnected by the through-holes, are connected in a same way, thereby reducing the brightness difference between the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , and thus avoiding the display split screen phenomenon at two sides of the symmetry axis Z. In some embodiments, the connection mode of the fourth signal lines  11  located in the two middle regions AAZ are the same as the connection mode of the first signal line and the second signal line, thereby reducing the brightness difference between the middle region AAZ and each of the first display region AA 1  and the second display region. AA 2 , and thus avoiding a middle stripe. 
     Since the region between the first through-hole K 1  and the second through-hole K 2  is a part of the non-display region, the fourth signal line  11  in the middle region AAZ defined by the first virtual straight line X 1  and the second virtual straight line X 2  will also be disconnected by the first non-display region NA 1 . In the embodiments of the present disclosure, the fourth signal lines  11  are connected to each other by the first connection line  21  located between two through-holes, to ensure the electrical connection between two fourth signal lines  11  that are configured to drive the pixel circuits in a same column. The first connection line  21  is arranged in the region of the non-display region located between the first through-hole K 1  and the second through-hole K 2 , so that the non-display region between the two through-holes can be reasonably utilized. The first through-hole K 1  and the second through-hole K 2  are independent from each other and are not connected to each other, so some circuit lines can be concentrated in the region between the first through-hole K 1  and the second through-hole K 2  without affecting the display effect. 
     In some embodiments, as shown in  FIG.  2   , at least one segments of the segments of the first connection line  21  between the first through-hole K 1  and the second through-hole K 2  does not extend along the edge of the first through-hole K 1  or the edge of the second through-hole K 2 . In this way, a certain space can be reserved between the first connection line  21  and the through-hole, to facilitate the design of other wirings. 
     In some embodiments of the present disclosure, a structure such as a partition column or a crack detection line is further provided in the first non-display region NA 1  between the first through-hole K 1  and the second through-hole K 2 . 
     In an example product, there are multiple fourth signal lines  11  in the middle region AAZ, for example, there are ten or dozens of fourth signal lines  11 . In an embodiment of the present disclosure, in order to clearly illustrate an implementation of the electrical connection between two fourth signal lines  11  located at two sides of the first non-display region NA 1 ,  FIG.  2    only schematically shows that two fourth signal lines  11  are provided in one of the two middle regions AAZ. In the following embodiments, the number of the fourth signal lines  11  arranged in the middle regions AAZ is only schematic, and is not intended to limit the present disclosure. 
     In other embodiments, as shown in  FIG.  3   , the connection line  20  includes a second connection line  22 , and the second connection line  22  connects the fourth signal lines  11  that are located at two sides of the first non-display region NA 1 , and at least a part of the second connection line  22  is located in the display region AA. As shown in  FIG.  3   , the second connection line  22  is entirely located in the display region AA for illustration. Some embodiments in which at least one line segment of the line segments of the second connection line  22  is located in the display region AA and another line segment of the line segments of the second connection line  22  is located in the non-display region will be described in the following. In certain embodiments, the second connection line  22  is used to connect the fourth signal lines  11  that are located at two sides of the first non-display region NA 1 , and at least one line segment of the second connection line  22  is arranged in the display region AA. In this way, the second connection line  22  does not occupy the space of the first non-display region NA 1  around the first through-hole K 1  and the second through-hole K 2 , thereby ensuring the electrical connection between the two fourth signal lines  11  that are configured to drive the pixel circuits in a same column, and reducing a sum of the area of the first non-display region NA 1 , the area of the first through-hole K 1 , and the area of the second through-hole K 2 , and thus improving the display visual effect. The connection mode of the fourth signal lines  11  in the middle regions AAZ that are located at two sides of the first non-display region NA 1  will not affect the connection mode of the signal line in the display region AA corresponding to each through-hole, so that the signal lines in the first display region AA 1 , the second display region AA 2 , and the third display region AA 3 , which are disconnected by the through-holes, are connected in a same way. Therefore, the brightness difference between the first display region AA 1 , the second display region AA 2 , and the third display region AA 3  can be reduced. Thus, a display split screen phenomenon at two sides of the symmetry axis Z can be avoided. In some embodiments, the connection mode of the fourth signal lines  11  located in two middle regions AAZ are the same as the connection mode of the first signal line and the second signal line, thereby reducing the brightness difference between the middle region AAZ and each of the first display region AA 1  and the second display region. AA 2 , and thus avoiding a middle stripe. 
     In the embodiments shown in  FIG.  2   , the fourth signal lines  11  located in the middle regions AAZ that are located at two sides of the first non-display region NA 1  are connected to each other by the first connection line  21 , the first wound line  41  and the second wound line  42  are located in the first non-display region NA 1 , and the third wound line  43  is located in the second non-display region NA 2 . In another embodiment, the fourth signal line  11  located in the middle regions AAZ that are located at two sides of the first non-display region NA 1  are connected to each other by the first connection line  21 , and the first wound line  41 , the second wound line  42 , and the third wound line  43  are all located in the display region AA. 
     In the embodiments shown in  FIG.  3   , the fourth signal lines  11  located in the middle regions AAZ that are located at two sides of the first non-display region NA 1  are connected to each other by the second connection line  22 , and the first wound line  41 , the second wound line  42 , and the third wound line  43  are all located in the display region AA. In another embodiment, the fourth signal lines  11  located in the middle regions AAZ that are located at two sides of the first non-display region NA 1  are connected to each other by the second connection line  22 , the first wound line  41  and the second wound line  42  are located in the first non-display region NA 1 , and the third wound line  43  is located in the second non-display region NA 2 . 
     In other embodiments, the connection lines  20  in the display panel include both the first connection line  21  and the second connection line  22 , at least a pair of the fourth signal lines  11  located at two sides of the first non-display region NA 1  is electrically connected to each other by the first connection line  21 , and at least another pair of the fourth signal lines  11  located at two sides of the first non-display region NA 1  is electrically connected to each other by the second connection line  22 , which are not shown in the drawings herein. 
       FIG.  4    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  4   , in the first direction x, a width d 3  of the second non-display region NA 2  located at a side of the third through-hole K 3 , a width d 4  of the first non-display region NA 1  located at a side of the first through-hole K 1  away from the second through-hole K 2 , and a width d 5  of the first non-display region NA 1  located at a side of the second through-hole K 2  close to the third through-hole K 3  satisfy: d 3 &gt;d 4 , and d 3 &gt;d 5 . In other words, a width of a frame around the third through-hole K 3  is greater than a width of a frame around the first through-hole K 1 , and is also greater than a width of a frame around the second through-hole K 2 . Such a configuration enables relatively more circuit wires to be arranged in the second non-display region NA 2  to meet design requirements. 
     The display panel includes not only a longitudinal signal lines  10  extending along the second direction y shown in  FIG.  4   , but also includes a lateral signal line (not shown in  FIG.  4   ) extending along the first direction x. The longitudinal signal lines  10  include fourth signal lines  11  located in the middle regions AAZ. The lateral signal lines are also disconnected by the first non-display region NA 1  and the second non-display region NA 2 . In order to ensure the electrical connection between the lateral signal lines that are disconnected, in some embodiments, wound lines are provided in the non-display region. Since the first non-display region NA 1  surrounds the first through-hole K 1  and the second through-hole K 2 , a length of a region occupied by the first non-display region NA 1  and the two through-holes in the first direction x is greater than a length of a region occupied by the second non-display region NA 2  and the third through-hole K 3  in the first direction x. In some embodiments, the wound line used to realize the electrical connection between the lateral signal lines is arranged in the second non-display region NA 2 , to achieve a relative short wound line and thus achieve a relatively small area occupied by the relatively short wound line. In this way, the second non-display region NA 2  has a frame with a relatively large width. The solution to achieve the electrical connection between the lateral signal lines disconnected by the through-hole will be described in the following embodiments. 
     In some embodiments, as shown in  FIG.  4   , a diameter of the third through-hole K 3  is smaller than a diameter of the first through-hole K 1  and is also smaller than a diameter of the second through-hole K 2 , and the first through-hole K 1  and the second through-hole K 2  can have different diameters or a same diameter. A length of a region occupied by the first non-display region NA 1  and two through-holes in the second direction y is d 6 , and a length of a region occupied by the second non-display region NA 2  and the third through-hole K 3  is in the second direction y is d 7 . In order to realize the electrical connection between the lateral signal lines disconnected by the through-hole and minimize the length of the wound line and the area occupied by the wound line, the wound line is arranged in the second non-display region NA 2 . In certain embodiments, the diameter of the third through-hole K 3  is set to be the smallest, which is beneficial to reduce the difference between d 6  and d 7 , and even realize d 6 =d 7 , which can improve the display visual effect. 
       FIG.  5    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  5   , the first connection lines  21  include a first connection sub-line  211  and a second connection sub-line  212  adjacent to the first connection sub-line  211 , the fourth signal lines  11  includes a first signal sub-line  111  and a second signal sub-line  112  adjacent to the first signal sub-line  111 , the first signal sub-line  111  is electrically connected to the first connection sub-line  211 , and the second signal sub-line  112  is connected to the second connection sub-line  212 . The first connection sub-line  211  includes a first line sub-segment  211   a , the second connection sub-line  212  includes a second line sub-segment  212   b , and the first line sub-segment  211   a  and the second line sub-segment  212   b  are adjacent to each other. In the first direction x, a distance d 8  between the first signal sub-line  111  and the second signal sub-line  112  and a distance d 9  between the first line sub-segment  211   a  and the second line sub-segment  212   b  satisfy: d 8 &gt;d 9 . With such a configuration, the distance between two adjacent first connection lines  21  in the first non-display region NA 1  can be reduced, thereby reducing a total width of the first connection lines  21  in the first direction x. In an aspect, it is beneficial to reduce the distance d 1  between the first through-hole K 1  and the second through-hole K 2 . In another aspect, a larger space can be reserved between the first connection line  21  and the first through-hole K 1 , or between the first connection line  21  and the second through-hole K 2 , which facilitates wiring in the first non-display region NA 1 . 
       FIG.  6    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure, and  FIG.  7    is a cross-sectional view along A-A′ shown in  FIG.  6   . In some embodiments, as shown in  FIG.  6   , the first connection lines  21  include a third connection sub-line  213  and a fourth connection sub-line  214 . The fourth signal lines  11  include a third signal sub-line  113  and a fourth signal sub-line  114 . The third signal sub-line  113  is electrically connected to the third connection sub-line  213 , and the fourth signal sub-line  114  is electrically connected to the fourth connection sub-line  214 . As shown in  FIG.  7   , the display panel includes a substrate  01 , the third connection sub-line  213  and the fourth connection sub-line  214  are located in different layers that are located on the substrate  01 , and an insulating layer is provided between the layer where the third connection sub-line  213  is located and the layer where the fourth connection sub-line  214  is located. Such a configuration can reduce the distance between adjacent first connection lines  21  in the first direction x, thereby reducing a total width occupied by the first connection lines  21  located between the first through-hole K 1  and the second through-hole K 2 . In an embodiment, it is beneficial to reduce the distance d 1  between the first through-hole K 1  and the second through-hole K 2 , and in embodiment aspect, a larger space can be reserved between the first connection line  21  and the first through-hole K 1 , or between the first connection line  21  and the second through-hole K 2 , which facilitates wiring in the first non-display region NA 1 . 
     In the embodiments of  FIG.  7   , two metal layers are used to form the first connection lines  21 . In other embodiments, the first connection lines  21  include three connection sub-lines respectively located in three different layers. That is, the first connection lines  21  are formed in three metal layers, so that a total width of the first connection lines  21  located between the first through-hole K 1  and the second through-hole K 2  can be reduced. 
     In some embodiments, the third connection sub-line  213  and the fourth connection sub-line  214  that are located in different layers at least partially overlap with each other, so that a total width of the first connection lines  21  located between the first through-hole K 1  and the second through-hole K 2  can be reduced. 
     In other embodiments, the display panel includes a first-type second connection line, and at least a line segment of the line segments of the first-type second connection line is located in the display region, and another line segment of the line segments of the first-type second connection line is located in the non-display region.  FIG.  8    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure. As shown in  FIG.  8   , the non-display region includes a third non-display region NA 3 , and the third non-display region NA 3  is located at a side of the middle region AAZ that is away from the first non-display region NA 1 . The second connection line  22  includes a fifth connection sub-line  225 , and the fifth connection sub-line  225  includes a first line segment  31  and a second line segment  32  that are connected to each other. The first line segment  31  is located in the display region AA, and the second line segment  32  is located in the third non-display regions NA 3 . The first line segment  31  has an end connected to the fourth signal line  11  in one middle region AAZ, and the second line segment  32  has an end connected to the fourth signal line  11  in another one middle region AAZ. In certain embodiments, the fifth connection sub-line  225  connects the two fourth signal lines  11  located in the two middle regions AAZ, and a line segment of the line segments of the fifth connection sub-line  225  is located in the third non-display region NA 3  and another line segment of the line segments of the fifth connection sub-line  225  is located in the display region AA. The fifth connection sub-line  225  does not occupy the space of the first non-display region NA 1  around the first through-hole K 1  and the second through-hole K 2 , thereby ensuring that the electrical connection between the two fourth signal lines  11  configured to drive the pixel circuits in a same column, and thus reducing an area of a region occupied by the first non-display region NA 1 , the first through-hole K 1 , and the second through-hole K 2 , and improving the symmetry of the region capable of displaying images at two sides of the symmetry axis extending in the second direction y. 
     Referring to  FIG.  1   , in the second direction y, the three through-holes are located at an upper part of the display panel, and the three through-holes are closer to the non-display region at the upper part of the display panel. In the embodiments of  FIG.  8   , the third non-display region NA 3  is a non-display region that is relatively closer to the three through-holes in the second direction y, to balance an entire length of the fifth connection sub-line  225  and a length of the first line segment  31  in the display region AA. In an aspect, the total length of the fifth connection sub-line  225  is increased, thereby increasing the load of the fourth signal line  11  to compensate the influence of the lack of pixels in the first non-display region NA 1  on the load of the fourth signal line  11 . In another aspect, the length of the first line segment  31  arranged in the display region AA is not too long, thereby reducing the reflection of the ambient light by the first line segment  31  and thus improving the display effect. 
     In some embodiments, as shown in  FIG.  8   , the second connection line  22  has a shape approximate to a U-shaped line, and the second connection line  22  is wound around the first non-display region NA 1 , to electrically connect two fourth signal lines  11  located at two sides of the first non-display region NA 1 . 
       FIG.  9    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  9   , the first line segment  31  includes a third line sub-segment  31   c  extending along the second direction y, and at least one third line sub-segment  31   c  is located in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 . In other words, the first line segment  31  of the second connection line  22  is wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , and is then connected to the fourth signal line  11  located in the middle region AAZ. As shown in  FIG.  9   , the first line segment  31  further includes a fourth line sub-segment  31   d  extending along the first direction x, the fourth line sub-segment  31   d  is connected to the third line sub-segment  31   c , and the fourth line sub-segment  31   d  is electrically connected to the fourth signal line  11  in the middle region AAZ. In certain embodiments, the first line segment  31  is wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , so that a length of the fourth line sub-segment  31   d  is relatively short, thereby reducing the overall length of the first line segment  31 , and thus reducing the reflection of the ambient light by the first line segment  31 . 
     In some embodiments, the first line segments  31  of all second connection lines  22  are wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , and the first line segments  31  are concentrated in a local region of the display region. With such a configuration, the first line segment  31  does not occupy the space of the display region AA at a side of the second through-hole K 2  away from the first through-hole K 1 , thereby improving the freedom of wiring in the display region AA. For example, other functional wirings can be arranged in the space of the display region AA located at the side of the second through-hole K 2  away from the first through-hole K 1  according to design requirements. 
       FIG.  10    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  10   , the first line segment  31  includes a third line sub-segment  31   c  extending along the second direction y and a fourth line sub-segment  31   d  extending along the first direction x, and the fourth line sub-segment  31   d  is connected to the third line sub-segment  31   c  and is electrically connected to the fourth signal line  11  in the middle region AAZ. At least one third line sub-segment  31   c  is located in the display region AA between the second through-hole K 2  and the third through-hole K 3 . In other words, the first line segment  31  of the second connection line  22  is wound in the region of the display region AA located at a side of the second through-hole K 2  away from the first through-hole K 1 , and is then connected to the fourth signal line  11  located in the middle region AAZ. With such a configuration, the length of the fourth line sub-segment  31   d  is relatively short, thereby reducing a total length of the first line segment  31 , and thus reducing the reflection of the ambient light by the first line segment  31 . 
     In some embodiments, all the first line segments  31  of the second connection lines  22  are wound in the region of the display region AA located between the third through-hole K 3  and the second through-hole K 2 . Compared with the entire display region AA, an area of the region of the display region that is located between the third through-hole K 3  and the second through-hole K 2  in the first direction x is relatively small, and the first line segments  31  are concentrated in a local region located between the third through-hole K 3  and the second through-hole K 2 , so that the reflection of the ambient light by the first line segment  31  has little effect on the display effect of the overall display region. 
       FIG.  11    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  11   , the first line segment  31  includes a third line sub-segment  31   c  extending along the second direction y, and at least one third line sub-segment  31   c  is located in the region of the display region AA located at a side of the third through-hole K 3  away from the second through-hole K 2 . In certain embodiments, the second connection line  22  does not occupy the space of the first non-display region NA 1  around the first through-hole K 1  and the second through-hole K 2 , thereby ensuring the electrical connection between the two fourth signal lines  11  configured to drive the pixel circuits in a same column. The area of the region occupied by the first non-display region NA 1 , the first through-hole K 1 , and the second through-hole K 2  can be reduced, and the display visual effect can be improved. With such a configuration, a total length of the fifth connection sub-line  225  can be increased, thereby increasing the load of the fourth signal line  11 , and compensating an influence of the lack of pixels in the first non-display region NA 1  on the load of the fourth signal line  11 . 
     In some embodiments, as shown in  FIG.  8   , the first line segment  31  of at least one second connection line  22  is wound in the region of the display region AA that is located at the side of the first through-hole K 1  away from the second through-hole K 2 , and the first line segment  31  of another at least one second connection line  22  is wound in the region of the display region AA located at the side of the second through-hole K 2  away from the first through-hole K 1 . In other words, the first line segments  31  are wound in the display region AA at two sides of the first non-display region NA 1 . With such a configuration, it can avoid that the density of local metal patterns is too high due to the concentrated arrangement of the first line segments  31 . When the first line segments  31  are dispersedly arranged, the density difference of the metal patterns at different positions in the display region AA can be reduced to a certain extent, to reduce reflectivity difference and improve the display effect. A length difference of the second connection lines  22  that are wound in the region of the display region AA located at two sides of the first non-display region NA 1  is not large, so that a difference between the loads of the fourth signal lines  11  is relatively small, and the display split screen phenomenon can be avoided. 
       FIG.  12    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  12   , the first line segment  31  of at least one second connection line  22  is wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , and the first line segment  31  of another at least one second connection line  22  is wound in a region of the display region AA that is located at a side of the third through-hole K 3  away from the second through-hole K 2 . 
       FIG.  13    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  13   , the first line segment  31  of at least one second connection line  22  is wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , the first line segment  31  of another at least one second connection line  22  is wound in a region of the display region AA that is located at a side of the second through-hole K 2  away from the first through-hole K 1 , and the first line segment  31  of still another at least one second connection line  22  is wound in a region of the display region AA that is located at a side of the third through-hole K 3  away from the second through-hole K 2 . 
     In some embodiments, the number m 1  of the third line sub-segments  31   c  located in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2  and the number m 2  of the third line sub-segments  31   c  located in a region of the display region AA that is located at a side of the second through-hole K 2  away from the first through-hole K 1  satisfy: |m 1 -m 2 |≤1, where both m 1  and m 2  are positive integers. The third line sub-segments  31   c  located in a region of the display region AA that is located at a side of the second through-hole K 2  away from the first through-hole K 1  include a third line sub-segment  31   c  located in a region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3  and/or a third line sub-segment  31   c  located in a region of the display region AA located at a side of the third through-hole K 3  away from the second through-hole K 2 . With the configuration where |m 1 -m 2 |≤1, a difference between the number of the first line segments  31  located at a side of the middle region AAZ in the first direction x and the number of the first line segments  31  located at another side of the middle region AAZ in the first direction x is small, and with the configuration where the first line segments  31  are arranged dispersedly, the density of metal patterns at different positions in the display region AA can be reduced to a certain extent, thereby reducing the difference in reflectivity and avoiding the display split screen phenomenon. 
     In other embodiments, the display panel includes second-type second connection lines, and all of the second-type second connection lines are located in the display region.  FIG.  14    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. As shown in  FIG.  14   , the second connection line  22  includes a sixth connection sub-line  226 , and the sixth connection sub-line  226  includes a third line segment  33  extending along the first direction x and the fourth line segment  34  extending along the second direction y. Each of two ends of the fourth line segment  34  is connected to a respective one of two third line segments  33 . The third line segment  33  and the fourth line segment  34  are both located in the display region AA, and each of the two third line segments  33  is connected to a respective of two fourth signal lines  11  located in the middle region AAZ. In certain embodiments, the sixth connection sub-line  226  is provided in the display region AA, and two fourth signal lines  11  located at two sides of the first non-display region NA 1  are connected to each other by the sixth connection sub-line  226 . The sixth connection sub-line  226  does not occupy the space of the first non-display region NA 1  around the first through-hole K 1  and the second through-hole K 2 , thereby ensuring the electrical connection between two fourth signal lines  11  configured to drive the pixel circuits in a same column, reducing the area of the region occupied by the first non-display region NA 1 , the first through-hole K 1 , and the second through-hole K 2 , and thus improving the symmetry of the region capable of displaying images at two sides of the symmetry axis extending in the second direction y. 
     As shown in  FIG.  14   , the fourth line segment  34  of at least one sixth connection sub-line  226  is located in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 . In certain embodiments, the sixth connection sub-line  226  is wound in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , so that a total length of the sixth connection sub-line  226  is relatively small, thereby reducing the reflection of the ambient light by the sixth connection sub-line  226 . 
     In some embodiments, all the sixth connection sub-lines  226  are wound in a region of the display region AA located at a side of the first through-hole K 1  away from the second through-hole K 2 , and the sixth connection sub-lines  226  are concentrate in a local region of the display region. With such a configuration, the sixth connection sub-lines  226  does not occupy the space of a region of the display region AA that is located at a side of the second through-hole K 2  away from the first through-hole K 1 , thereby improving the freedom of wiring in the display region AA. For example, other functional wires are arranged in the region of the display region AA located at the side of the second through-hole K 2  away from the first through-hole K 1 . 
       FIG.  15    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  15   , the fourth line segment  34  of at least one sixth connection sub-line  226  is located in a region of the display region located between the second through-hole K 2  and the third through-hole K 3 . In certain embodiments, the sixth connection sub-line  226  is wound in the region of the display region AA located between the third through-hole K 3  and the second through-hole K 2 , so that a total length of the sixth connection sub-line  226  is relatively small, thereby reducing the reflection of the ambient light by the six connection sub-lines  226 . Compared with the entire display region AA, an area of the region of the display region located between the third through-hole K 3  and the second through-hole K 2  in the first direction x is relatively small, and the sixth connection sub-lines  226  are concentrated in the a local region between the third through-hole K 3  and the second through-hole K 2 , and the reflection of the ambient light by the sixth connection sub-line  226  has little effect on the display effect of the overall display region. 
     In some embodiments, all the sixth connection sub-lines  226  are wound in the region of the display region AA that is located between the third through-hole K 3  and the second through-hole K 2 . 
       FIG.  16    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  16   , the fourth line segment  34  of at least one sixth connection sub-line  226  is located in a region of the display region AA that is located at a side of the third through-hole K 3  away from the second through-hole K 2 . In certain embodiments, the sixth connection sub-line  226  is located in the display region AA, and does not occupy the space of the region of the first non-display region NA 1  around the first through-hole K 1  and the second through-hole K 2 , thereby ensuring the electrical connection between the fourth signal lines  11  configured to drive the pixel circuits in a same column, and reducing an area of the region occupied by the first non-display region NA 1 , the first through-hole K 1 , and the second through-hole K 2 , and thus improving the display visual effect. In this way, a total length of the sixth connection sub-line  226  is increased, thereby increasing the load of the fourth signal line  11 , and compensating the influence of the lack of pixels in the first non-display region NA 1  on the load of the fourth signal line  11 . 
       FIG.  17    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  17   , the fourth line segment  34  of the sixth connection sub-line  226  is located in a region of the display region AA that is located at a side of the first through-hole K 1  away from the second through-hole K 2 , and the fourth line segment  34  of another at least one sixth connection sub-line  226  is located in a region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3 . In certain embodiments, the sixth connection sub-lines  226  are dispersedly arranged, which can prevent the density of the local metal patterns from being too large due to the concentrated arrangement of the sixth connection sub-lines  226 . With the configuration where the sixth connection sub-lines  226  are dispersedly arranged, the density difference of metal patterns at different positions of the display region AA can be reduced, thereby reducing the difference in reflectivity and improving the display effect. A difference of the lengths of the sixth connection sub-lines  226  that are wound in the region of the display region AA located at two sides of the first non-display region NA 1  is not large, so that a difference of the loads of all fourth signal lines  11  is relatively small, which can avoid the display split screen phenomenon. 
     In other embodiments, the fourth line segment  34  of at least one sixth connection sub-line  226  is located in the region of the display region AA located at the side of the first through-hole K 1  away from the second through-hole K 2 , and the fourth line segment  34  of another at least one sixth connection sub-line  226  is located in the region of the display region AA that is located at the side of the third through-hole K 3  away from the second through-hole K 2 , which is not shown in the drawings herein. 
       FIG.  18    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  18   , the fourth line segment  34  of at least one sixth connection sub-line  226  is located in the region of the display region AA that is located at the side of the first through-hole K 1  away from the second through-hole K 2 , and the fourth line segment  34  of another at least one sixth connection sub-line  226  is located in the region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3 , the fourth line segment  34  of still another at least one sixth connection sub-line  226  is located in the region of the display region AA that is located at a side of the third through-hole K 3  away from the second through-hole K 2 . 
     In some embodiments, the number m 3  of the fourth line segments  34  located in the region of the display region AA that is located at the side of the first through-hole K 1  away from the second through-hole K 2  and the number m 4  of the fourth line segments  34  located in the region of the display region AA that is located at the side of the second through-hole K 2  away from the first through-hole K 1  satisfy: |m 3 -m 4 |≤1, where both m 3  and m 4  are positive integers. The fourth line segments  34  located in the region of the display region AA that is located at the side of the second through-hole K 2  away from the first through-hole K 1  include the fourth line segment  34  located between the second through-hole K 2  and the third through-hole K 3  and/or the fourth line segment  34  located in the region of the display region AA that is located at a side of the through-hole K 3  away from the second through-hole K 2 . With the configuration where |m 3 -m 4 |≤1, a difference of the number of the sixth connection sub-lines  226  located at one side of the middle region AAZ in the first direction x and the number of the sixth connection sub-lines  226  located at another one side of the middle region AAZ in the first direction x is small, and the configuration where the sixth connection sub-lines  226  are dispersedly arranged can reduce the difference in density of metal patterns at different positions of the display region AA, thereby reducing the difference in reflectivity and improving the display effect. 
     In other embodiments, the display panel includes a fifth connection sub-line  225  and a sixth connection sub-line  226 .  FIG.  19    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure. As shown in  FIG.  19   , the second connection lines  22  include a fifth connection sub-line  225  and a sixth connection sub-line  226 . At least one line segment of the line segments of the fifth connection sub-line  225  is located in the third non-display region NA 3 , and another at least one line segment of the line segments of the fifth connection sub-line  225  is located in the display region AA. The sixth connection sub-line  226  is entirely located in the display region AA. The number of the fifth connection sub-lines  225  is smaller than the number of the sixth connection sub-lines  226 . Referring to  FIG.  1   , in the second direction y, the three through-holes are located at an upper part of the display panel, and the three through-holes are closer to the non-display region at an upper part of the display panel. In the embodiments of  FIG.  19   , the third non-display region NA 3  is a non-display region with a relatively short distance from the three through-holes in the second direction y. When there is not enough space of the region of the display region AA that is located between the first non-display region NA 1  and the third non-display region NA 3 , the sixth connection sub-line  226  is arranged in the region of the display region AA that is located between the first non-display region NA 1  and the third non-display region NA 3 , while at least one line segment of the line segments of the fifth connection sub-line  225  is arranged in the third non-display region NA 3  to ensure the electrical connection between the fourth signal lines  11  located at two sides of the first non-display region NA 1 . Since the distance between the third non-display region NA 3  and each of the three through-holes is relatively small, the difference between the length of the fifth connection sub-line  225  and the length of the sixth connection sub-line  226  in the embodiments of  FIG.  20    is relatively small, so that the difference between the loads of the fourth signal line  11  is relatively small. The number of the fifth connection sub-lines  225  is smaller than the number of the sixth connection sub-lines  226 . That is, the fifth connection sub-lines  225  are first considered to be arranged in the display region AA, thereby reducing an influence of the sixth connection sub-lines  226  on the width of the frame. 
     The embodiments of  FIG.  19    only illustrate that the fifth connection sub-line  225  and the sixth connection sub-line  226  are wound at a side of the first through-hole K 1  away from the second through-hole K 2  for illustration. 
     In the embodiments of the present disclosure, the second connection lines  22  include a fifth connection sub-line  225  and a sixth connection sub-line  226 . The fifth connection sub-line  225  may be wound at a side of the first through-hole K 1  away from the second through-hole K 2 , or be wound between the third through-hole K 3  and the second through-hole K 2 , or be wound at a side of the third through-hole K 3  away from the second through-hole K 2 . The sixth connection sub-line  226  may be wound at a side of the first through-hole K 1  away from the second through-hole K 2 , or be wound between the third through-hole K 3  and the second through-hole K 2 , or be wound at a side of the third through-hole K 3  away from the second through-hole K 2 . 
       FIG.  20    is another partial schematic diagram of a display panel according to some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  20   , the number of the first wound lines  41  located at one side of the first through-hole K 1  is equal to the number of the first wound lines  41  located at another one side of the first through-hole K 1 , and/or, the number of the second wound lines  42  located at one side of the second through-hole K 2  is equal to the number of the second wound lines  42  located at another one side of the second through-hole K 2 . The number of the first wound lines  41  located at one side of the first through-hole K 1  is equal to the number of the first wound lines  41  located at another one side of the first through-hole K 1 , so that a difference between the lengths of different first wound lines  41  can be reduced, and a difference between loads of the first signal lines  12  can be reduced, thereby improving the brightness uniformity of the first display region AA 1 . The number of the second wound lines  42  located at one side of the second through-hole K 2  is equal to the number of the second wound lines  42  located at another one side of the second through-hole K 2 , so that a difference between the lengths of different second wound lines  42  can be reduced, and a difference between the loads of the second signal lines  13  can be reduced, thereby improving the brightness uniformity of the second display region AA 2 . 
       FIG.  21    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In other embodiments, as shown in  FIG.  21   , the number n 1  of the first wound lines  41  located at the side of the first through-hole K 1  away from the second through-hole K 2  and the number n2 of the first wound lines  41  located at the side of the first through-hole K 1  close to the second through-hole K 2  satisfy: n 1 &lt;n 2 ; and/or, the number n 3  of the second wound lines  42  located at the side of the second through-hole K 2  away from the first through-hole K 1  and the number n 4  of the second wound lines  42  located at the side of the second through-hole K 2  close to the first through-hole K 1  satisfy: n 3 &lt;n 4 . In certain embodiments, the number of the first wound lines  41  located at the side of the first through-hole K 1  away from the second through-hole K 2  is relatively small, and the number of the second wound lines  42  located at the side of the second through-hole K 2  away from the first through-hole K 1  is relatively small, and more first wound lines  41  and more second wound lines  42  are concentrated between the first through-hole K 1  and the second through-hole K 2 , so that it is beneficial to reduce a width of the frame located at the side of the first through-hole K 1  away from the second through-hole K 2  and reduce a width of the frame located at the side of the second through-hole K 2  away from the first through-hole K 1 , thereby improving the display visual effect. 
     In some embodiments, the first wound line  41  and the second wound line  42  are both located between the first through-hole K 1  and the second through-hole K 2 . That is, no first wound line  41  is provided at the side of the first through-hole K 1  away from the second through-hole K 2 , and no second wound line  42  is arranged at the side of the second through-hole K 2  away from the first through-hole K 1 . Such a configuration can greatly reduce a width of the frame located at the side of the first through-hole K 1  away from the second through-hole K 2  and a width of the frame located at the side of the second through-hole K 2  away from the first through-hole K 1 . 
       FIG.  22    is a cross-sectional view along B-B′ shown in  FIG.  21   . In some embodiments, as shown in  FIG.  22   , the first wound lines  41  include a first wound sub-line  41   a  and a second wound sub-line  41   b  that are located in different layers, the second wound lines  42  include a third wound sub-line  42   c  and a fourth wound sub-line  42   d  that are located in different layers. In some embodiments, the first wound sub-line  41   a  and the third wound sub-line  42   c  may be located in a same layer, and the second wound sub-line  41   b  and the fourth wound sub-line  42   d  may be located in a same layer. In certain embodiments, the first wound lines  41  are formed in two metal layers, and the second wound lines  42  are formed in two metal layers. Such a configuration can reduce the distance between adjacent first wound lines  41  in the first direction x and also can reduce the distance between adjacent second wound lines  42  in the first direction x, and thus a total width occupied by the first wound lines  41  that are located between the first through-hole K 1  and the second through-hole K 2  can be reduced, thereby reducing a distance d 1  between the first through-hole K 1  and the second through-hole K 2 , and thus being beneficial to reduce a total length of the region formed by the first non-display region NA 1 , the first through-hole K 1 , and the second through-hole K 2  in the first direction x, thereby improving the overall display effect. 
     In other embodiments, among the first wound lines  41  and the second wound lines  42 , only the first wound lines  41  are formed in two metal layers. That is, the first wound lines  41  include the first wound sub-line  41   a  and the second wound sub-line  41   b  that are located in different layers. 
     In other embodiments, among the first wound lines  41  and the second wound lines  42 , only the second wound lines  42  are formed in two metal layers. That is, the second wound lines  42  include the third wound sub-line  42   c  and the fourth wound sub-line  42   d  that are located in different layers. 
     In some embodiments, as shown in  FIG.  20   , the number of the third wound lines  43  located at one side of the third through-hole K 3  is equal to the number of the third wound lines  43  located at another one side of the third through-hole K 3 . Such a configuration can reduce a difference between the lengths of different third wound lines  43 , and can also reduce a difference between the loads of the third signal lines  14 , thereby improving the brightness uniformity of the third display region AA 3 . It is beneficial to realize that the frame has a same width at two sides of the third through-hole K 3 , thereby improving the aesthetics. 
     In some embodiments, multiple third wound lines  43  are formed in two metal layers, thereby reducing a distance between adjacent third wound lines  43 , thereby facilitating to reduce a width of the frame located in the second non-display region NA 2 , and thus improving the overall visual effect. 
     In other embodiments, at least one side of the through-hole in the first direction x, at least two of the number of the first wound lines  41  at a side of the first through-hole K 1 , the number of the second wound lines  42  at a side of the second through-hole K 2 , or the number of the third wound lines  43  at a side of the third through-hole K 3  are different from each other. Taking the first direction x as the left and right direction of the three through-holes as an example, the number of the lines located at a left side of one through-hole of at least two through-holes of the three through-holes is different from the number of the lines located at a left side of another through-hole of at least two through-holes of the three through-holes, or the number of the lines located at a right side of one through-hole of at least two through-holes of the three through-holes is different from the number of the lines located at a right side of another through-hole of at least two through-holes of the three through-holes. Taking the embodiments of  FIG.  21    as an example, at the left side of each of the three through-holes in the first direction x, the number of the third wound lines  43  located at the left side of the third through-hole K 3  is greater than the number of the third wound lines  43  located at the left side of the first through-hole K 1  and is smaller than the number of the second wound lines  42  located at the left side of the second through-hole K 2 . That is, at the left side in the first direction x, the number of the first wound lines  41  at a left side of the first through-hole K 1 , the number of the second wound lines  42  at a left side of the second through-hole K 2 , and the number of the third wound lines  43  at a left side of the third through-hole K 3  are different from each other. In the embodiments of  FIG.  22   , at the right side in the first direction x, the number of the first wound lines  41  at a right side of the first through-hole K 1 , the number of the second wound lines  42  at a right side of the second through-hole K 2 , and the number of the third wound lines  43  at a right side of the third through-hole K 3  are different from each other. 
     In some embodiments, at a same side of each of the through-holes in the first direction x, the number of the wound lines close to the first through-hole K 1  or the number of the wound lines close to the second through-hole K 2  can be greater than the number of the wound lines close to the third through-hole K 3 , or the number of the wound lines close to the first through-hole K 1  or the number of the wound lines close to the second through-hole K 2  can be smaller than the number of the wound lines close to the third through-hole K 3 . 
     The embodiments of the present disclosure can combine factors such as the size of the through-hole, the location of the through-holes in the display region AA, the number of signal lines disconnected by the through-holes in the second direction y, and the overall visual effect when the display region AA displays images, to make different designs on the number of the wound lines at a same side of each of the three through-holes in the first direction x. Reasonable wiring is arranged around the three through-holes to ensure the electrical connection between the longitudinal signal lines that are disconnected by the through-holes, thereby ensuring the overall visual effect and improving the aesthetics. 
       FIG.  23    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  23   , more first wound lines  41  are provided at the side of the first through-hole K 1  away from the second through-hole K 2 , and more second wound lines  42  are provided at the side of the second through-hole K 2  away from the first through-hole K 1 , so that a width of the region of the non-display region that is located between the second through-hole K 2  and the first through-hole K 1  can be reduced. 
       FIG.  24    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  24   , the display panel includes a lateral signal line  50  extending along the first direction x, and the lateral signal line  50  includes a first lateral signal line  51 . The first lateral signal line  51  includes a first lateral signal sub-line  51   a , a second lateral signal sub-line  51   b , and a third lateral signal sub-line  51   c  that are configured to transmit a same signal. 
     The first lateral signal sub-line  51   a  is located in the region of the display region AA located at the side of the first through-hole K 1  away from the second through-hole K 2  and is disconnected at the first through-hole K 1 , the second lateral signal sub-line  51   b  is located in the region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3 , and the third lateral signal sub-line  51   c  is located in the region of the display region AA that is located at the side of the third through-hole K 3  away from the second through-hole K 2 . 
     The display panel includes a fourth wound line  44  located in the second non-display region NA 2 , and the second lateral signal sub-line  51   b  and the third lateral signal sub-line  51   c  are connected to each other through the fourth wound line  44 . 
     In certain embodiments, the second lateral signal sub-line  51   b  is connected to the third lateral signal sub-line  51   c  through the fourth wound line  44 , to ensure that the signal is provided to the lateral signal line located in the region of the display region that is located between the second through-hole K 2  and the third through-hole K 3 . The first lateral signal sub-line  51   a  is disconnected at the first through-hole K 1 , and no wound line configured to connect the first lateral signal sub-line  51   a  and the second lateral signal sub-line  51   b  is provided in the first non-display region NA 1 , which can save the space of the first non-display region NA 1 . 
       FIG.  25    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  25   , the non-display region includes a fourth non-display region NA 4  and a fifth non-display region NA 5 . In the first direction x, the fourth non-display region NA 4  and the fifth non-display region NA 5  are respectively located at two sides of the display region AA. The display panel includes driving circuits  60  located in the non-display region, and the driving circuit  60  includes shift registers  70  that are cascaded. The driving circuits  60  include a first driving circuit  61  and a second driving circuit  62 , the first driving circuit  61  is located in the fourth non-display region NA 4 , and the second driving circuit  62  is located in the fifth non-display region NA 5 . A p-th shift register  70 _ p  of the first driving circuit  61  is electrically connected to one first lateral signal sub-line  51   a , and a p-th shift register  70 _ p  of the second driving circuit  62  is electrically connected to one third lateral signal sub-line  51   c , where p is a positive integer. The p-th shift register  70 _ p  of the first driving circuit  61  and the p-th shift register  70 _ p  of the second driving circuit  62  are configured to transmit a same signal. The lateral signal line  50  includes a third lateral signal line  53 , and the third lateral signal line  53  and the first lateral signal line  51  are configured to transmit a same type of signal. The third lateral signal line  53  passes through the display region AA in the first direction x, and is not disconnected by the through-hole. The third lateral signal line  53  has an end connected to one shift register  70  of the first driving circuit  61 , and another end connected to one shift register  70  of the second driving circuit  62 . In certain embodiments, the first lateral signal line  51  and the third lateral signal line  53  are driven in a bilateral-driving manner. A signal is provided to the first lateral signal sub-line  51   a  through the first driving circuit  61 , and a signal is provided to the second lateral signal sub-line  51   b  and the third lateral signal sub-line  51   c  through the second driving circuit  62 , to ensure that the pixels driven by the first lateral signal line  51  can all emit light normally, and no wound line configured to connect the lateral signal sub-lines of the first lateral signal line  51  is provided in the first non-display region NA 1 , thereby saving the space of the first non-display region NA 1 . 
       FIG.  26    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  26   , the display panel includes a lateral signal line  50  extending along the first direction x, and the lateral signal line  50  includes a second lateral signal lines  52 . The second lateral signal line  52  includes a fourth lateral signal sub-line  52   d , a fifth lateral signal sub-line  52   e , and a sixth lateral signal sub-line  52   f  that are configured to transmit a same signal. The fourth lateral signal sub-line  52   d  is located in the region of the display region AA that is located at the side of the first through-hole K 1  away from the second through-hole K 2 , the fifth lateral signal sub-line  52   e  is located in the region of the display region AA that is located between the second through-hole K 2  and the third through-hole K 3 , and the sixth lateral signal sub-line  52   f  is located in the region of the display region AA located at the side of the third through-hole K 3  away from the second through-hole K 2 . The display panel includes a fifth wound line  45  and a sixth wound line  46 . The fifth wound line  45  has an end connected to the fourth lateral signal sub-line  52   d , and another end connected to the fifth lateral signal sub-line  52   e . The sixth wound line  46  has an end connected to the fifth lateral signal sub-line  52   e , and another end connected to the sixth lateral signal sub-line  52   f . The fifth wound line  45  is located in the first non-display region NA 1 , and the sixth wound line  46  is located in the second non-display region NA 2 . 
     In certain embodiments, the fourth lateral signal sub-line  52   d  and the fifth lateral signal sub-line  52   e  are connected to each other through the fifth wound line  45 , and the fifth lateral signal sub-line  52   e  and the sixth lateral signal sub-line  52   f  are connected to each other through the sixth wound line  46 . The lateral signal sub-lines disconnected by the through-holes are electrically connected to each other, thereby ensuring that the pixels driven by the second lateral signal line  52  can emit light normally. 
       FIG.  27    is another partial schematic diagram of a display panel provided by some embodiments of the present disclosure. In some embodiments, as shown in  FIG.  27   , the non-display region includes a fourth non-display region NA 4  and a fifth non-display region NA 5 . In the first direction x, the fourth non-display region NA 4  and the fifth non-display region NA 5  are respectively located at two sides of the display region AA. The display panel includes a driving circuit  60  located in the non-display region, and the driving circuit  60  includes shift registers  70  that are cascaded. The driving circuit  60  includes a third driving circuit  63  located in the fourth non-display region NA 4 , and a q-th shift register  70 _ q  of the third driving circuit  63  is electrically connected to two fourth lateral signal sub-lines  52   d . The lateral signal line  50  includes a fourth lateral signal line  54 , and the fourth lateral signal line  54  and the second lateral signal line  52  are configured to transmit a same type of signal. The fourth lateral signal line  54  passes through the display region AA in the first direction x, and is not disconnected by the through-hole. One of two fourth lateral signal lines  54 . Each of two fourth lateral signal lines  54  has an end connected to a same shift register  70  of the third driving circuit  63 . In certain embodiments, the second lateral signal line  52  and the fourth lateral signal line  54  are driven in a unilateral-driving manner, and two lateral signal lines are connected to a same shift register  70 , which can not only reduce the space occupied by the third driving circuit  63  in the non-display region, but also can reduce the number of the fifth wound lines  45  arranged in the first non-display region NA 1  and the number of the sixth wound lines  46  arranged in the second non-display region NA 2 , thereby reducing a width of the frame of the non-display region. 
       FIG.  27    illustrates that the third driving circuit  63  is located in the fourth non-display region NA 4 . In other embodiments, the third driving circuit  63  is located in the fifth non-display region NA 5 , and the q-th shift register  70 _ q  of the third driving circuit  63  is electrically connected to two sixth lateral signal sub-lines  52   f , where q is a positive integer. 
     Based on the same concept, some embodiments of the present disclosure further provide a display device.  FIG.  28    is a schematic diagram of the display device provided by some embodiments of the present disclosure. As shown in  FIG.  28   , the display device includes the display panel  100  provided by any embodiment of the present disclosure. The structure of the display panel has been described in the above embodiments, and will not be repeated herein. The display device provided by the embodiments of the present disclosure can be, for example, an electronic device such as a mobile phone, a computer, a TV, a tablet, or a smart wearable device. 
     The above description illustrates only some embodiments of the present disclosure, and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, and the like made within the principle of the present disclosure shall fall within the protection scope of the present disclosure. 
     Finally, it should be noted that the foregoing embodiments are merely intended to describe and not to limit the technical solutions of the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, persons skilled in the art should understand that they can still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some or all of the technical features thereof. These modifications or replacements fall within the scope of the technical solutions of the embodiments of the present disclosure.