Patent Publication Number: US-2023161381-A1

Title: Display panel and display device

Description:
CROSS REFERENCE TO RELEVANT APPLICATIONS 
     The present application is filed on the basis of and claims the priority of the Chinese patent application filed on Jul. 15, 2020 with the application number of 202010680366.3, which is incorporated herein in its entirety by reference. 
     TECHNICAL FIELD 
     The present application relates to the technical field of displaying and, more to particularly, to a display panel and a display device. 
     BACKGROUND 
     In the related art, before the bending process of a display panel, back-film removal is performed to the display panel. However, in order to reduce the width of the border frame of the display panel, the heat-affected area of the back-film removal and the precision reference of back-film removal easily interfere. Further, the thickness of the back-film component within the heat-affected area is not even, which results in abnormality of the precision correction of the back-film removal, which affects the precision of the back-film removal, affects the product quality, and affects the yield of the bending of the display panel. 
     SUMMARY 
     The present application aims at solving at least one of the technical problems in the related art. In view of the above, the present application provides a display panel, wherein the display panel facilitates to realize the normal correction of the precision of the back-film removal, ensures the precision of the back-film removal, that effectively increases the yield of the product. 
     The present application further provides a display device having the display panel stated above. 
     In the display panel according to a first aspect of the present application, the display panel includes an active area and a non-active area surrounding the active area, the non-active area includes a bending and controlling area, the bending and controlling area is separate from the active area and includes a bending area and a controlling area, the controlling area includes a first controlling area and a second controlling area, the first controlling area is located between the active area and the bending area, and the second controlling area is located on one side of the bending area that is away from the active area; 
     the display panel includes: 
     a substrate; 
     a multilayer insulating layer, wherein the multilayer insulating layer is disposed on one side of the substrate, the multilayer insulating layer has a depression part, the depression part is located within the non-active area, and at least part of an orthographic projection of the depression part on the substrate is located within the bending area, and a filling member is disposed inside the depression part; and 
     a back-film component, wherein the back-film component is disposed on one side of the substrate that is back to the multilayer insulating layer, and a thickness of the back-film component that is located within the active area is less than a thickness of the back-film. component that is located within the controlling area, and is greater than a thickness of the back-film component that is located within the bending area; and 
     the display panel has a marker, the marker is located within the non-active area, and is separately disposed around the depression part, and the marker is suitable for serving as a correction reference of the bending area. 
     In the display panel according to the present application, by disposing the marker on the display panel, the marker may be located within the non-active area, and separately disposed around the depression part, so that the marker may serve as the correction reference of the bending area, thereby effictively ensuring that the marker may be normally identified in the precision correction of the back-film removal, which ensures the precision of the back-film removal of the display panel, increases the precision of the bending of the display panel, and ensures the yield, whereby the display panel may be better suitable for the demand on further shrinking the border frame. 
     In some embodiments, a first boundary is formed between the bending area and the first controlling area, a second boundary is formed between the bending area and the second controlling area, and a quantity of the markers is more than one and the marker includes: 
     a first marker, wherein the first marker is separately disposed on one side of the depression part that is close to the active area, and the first marker is suitable for serving as a correction reference of the first boundary; and 
     a second marker, wherein the second marker is separately disposed on one side of the depression part that is away from the active area, and the second marker is suitable for serving as a correction reference of the second boundary. 
     In some embodiments, the marker is suitable for serving as a correction reference of the depression part. 
     In some embodiments, the depression part has a third boundary and a fourth boundary that are opposite, and a quantity of the markers is more than one and the marker includes: 
     a first marker, wherein the first marker is separately disposed on one side of the depression part that is close to the active area, and the first marker is suitable for serving as a correction reference of the third boundary; and 
     a second marker, wherein the second marker is separately disposed on one side of the depression part that is away from the active area, and the second marker is suitable for serving as a correction reference of the fourth boundary. 
     In some embodiments, the display panel further includes a signal-line layer located on one side of the depression part that is away from the substrate; and: 
     within the bending area, the signal-line layer is disposed between the substrate and the filling member, the orthographic projection of the depression part on the substrate is located within an orthoggraphic projection of the signal-line layer on the substrate, and the signal-line layer is electrically connected to a data line within the active area. 
     In some embodiments, the depression part includes a plurality of grooves that are sequentially stacked in a direction perpendicular to the substrate, and the filling member fills the plurality of grooves. 
     In some embodiments, the marker is separately disposed around the signal-line layer, and an orthographic projection of the marker on the substrate does not overlap with the orthographic projection of the signal-line layer on the substrate; or 
     the marker is located on one side of the signal-line layer that is close to the substrate, an orthographic projection of the marker on the substrate is located within an area of an orthographic projection of the signal-line layer on the substrate, and a boundary of the orthographic projection of the marker on the substrate and a boundary of the orthographic projection of the signal-line layer on the substrate are separate; or 
     the signal-line layer includes a plurality of connecting lines that are separate, the marker is disposed on one side of the signal-line layer that is close to the substrate, and the orthographic projection of the marker on the substrate is located between orthographic projections of two neighboring connecting lines on the substrate. 
     In some embodiments, the bending area extends in a direction of a boundary of the active area, a quantity of the markers is more than one, and the plurality of markers are separately arranged in an extending direction of the bending area. 
     In some embodiments, the marker is located in the multilayer insulating layer. 
     In some embodiments, the marker is formed as pan L shape, a cross shape, a polygonal shape, a circular shape or an elliptical shape. 
     A display device according to a second aspect of the present application includes the display panel according to the first aspect of the present application. 
     The display device according to the present application, by using the display panel stated above, is better suitable for the demand on further shrinking the border frame. 
     Some of the additional aspects and advantages of the present application will be given in the following description, and some will become apparent from the following description or be known from the implementation of the present application. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a sectional view of the display panel according to an embodiment of the present application; 
         FIG.  2    is another schematic diagram of the display panel shown in  FIG.  1   ; 
         FIG.  3    is a sectional view of the display panel according to another embodiment of the present application; 
         FIG.  4    is another schematic diagram of the display panel shown in  FIG.  3   ; and 
         FIG.  5    is a schematic diagram of the display panel according to yet another embodiment of the present application. 
     
    
    
     REFERENCE NUMBERS 
     display panel  100 ; 
     active area R 1 , non-active area R 2 , bending and controlling area R 21 ; 
     bending area R 211 , first boundary S 1 , second boundary S 2 ; 
     controlling area R 212 , first controlling area R 212   a , second controlling area R 212   b;    
     substrate  1 ; 
     insulating layer  2 , depression part  21 , third boundary S 3 , fourth boundary S 4 , step component  210 ; 
     grooves  211 , first groove  211   a , second groove  211   b , boundary S 5  of second groove; 
     back-film component  3 , filling member  4 ; 
     marker  5 , first markers  51 , second markers  52 ; and 
     signal-line layer  6 , connecting lines  61 , data line  8 . 
     DETAILED DESCRIPTION 
     The embodiments of the present application will be described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numbers throughout the drawings indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary, are intended to interpret the present application, and should not be construed as a limitation on the present application. 
     The disclosure below provides many different embodiments or examples for the implementation of different configurations of the present application. In order to simplify the disclosure of the present application, components and configurations of specific examples will be described below. Certainly, they are merely examples, and are not intended to limit the present application. Furthermore, the present application may repeat the reference numbers and/or letters in the different examples. Such repeating is for the purpose of simplification and clarity, and it does not indicate the relation between the various discussed embodiments and/or configurations. Furthermore, the present application provides examples of various particular processes and materials, but a person skilled in the art may envisage the applicability of other processes and/or the usage of other materials. 
     A display panel  100  according to an embodiment in the first aspect of the present application will be described below with reference to the drawings. The display panel  100  may be a flexible display panel, but is not limited thereto. 
     As shown in  FIGS.  1  and  3   , the display panel  100  includes an active area R 1  and non-active area R 2  surrounding the active area R 1 . The non-active area R 2  is located at the periphery of the active area R 1 , and the non-active area R 2  includes a bending and controlling area R 21 . The bending and controlling area R 21  and the active area R 1  are separate, and the bending and controlling area R 21  includes a bending area R 211  and a controlling area R 212 . The controlling area R 212  includes a first controlling area R 212   a  and a second controlling area R 212   b , The first controlling area R 212   a  is located between the active area R 1  and the bending area R 211 . Accordingly, the first controlling area R 212   a  is located on the side of the bending area R 211  that is close to the active area R 1 , and the second controlling area R 212   b  is located on the side of the bending area R 211  that is away from the active area R 1 . 
     The display panel  100  may have a modeling condition. In the modeling condition, the bending area R 211  is bent to form a bent part, whereby a part of the non-active area R 2  is located under the active area R 1 ; in other words, a part of the non-active area R 2  is located on the back side of the active area R 1 , which may reduce the width of the border frame of the display panel  100 , to facilitate to realize a design of narrow border frame. If the bent part corresponds to a radius of R, then the length L of the bending area R 211  in the bending direction is approximately πR. 
     As shown in  FIGS.  1  and  3   , the display panel  100  includes a substrate  1  and a multilayer insulating layer  2 , the multilayer insulating layer  2  is disposed on one side of the substrate  1 , the multilayer insulating layer  2  has a depression part  21 , the depression part  21  is located within the non-active area R 2 , at least part of the orthographic projection of the depression part  21  on the substrate I is located within the bending area R 211 , and a filling member  4  is disposed inside the depression part  21 . For example, in the examples of  FIGS.  1  and  3   , the multilayer insulating layer  2  is disposed on one side of the substrate  1  in the thickness direction (for example, the direction CC in  FIG.  1   ), the multilayer insulating layer  2  is in stack in the thickness direction of the substrate  1 , and at least part of the depression part  21  and the bending area R 211  face each other in the thickness direction of the substrate  1 . 
     The display panel  100  further includes a back-film component  3 , the back-film component  3  is disposed on the side of the substrate  1  that is hack to the multilayer insulating layer  2 , the thickness of the back-film component  3  that is located within the active area R 1  is less than the thickness of the back-film component  3  that is located within the controlling area R 212 , and the thickness of the back-film component  3  that is located within the active area R 1  is greater than the thickness of the back-film component  3  that is located within the bending area R 211 . 
     Accordingly, as comparison, the back-film component  3  located at the bending area R 211  has a lower thickness. Moreover, at least part of the orthographic projection of the depression part  21  on the substrate  1  is located within the bending area R 211 , and accordingly at least part of the orthographic projection of the depression part  21  in the thickness direction of the substrate  1  is located within the bending area R 211 , whereby thin back-film component  3  and insulating layer  2  are reserved within the bending, area R 211 . Furthermore, the filling member  4  is disposed inside the depression part  21 , which facilitates to control the circuit layer within the bending area R 211 , for example, the signal-line layer  6 , to be located at the “neutral layer”, i.e., facilitates to enable the circuit layer within the bending area R 211  to be located at the middle position in the thickness direction of the display panel  100 . Accordingly, in the process of bending the bending area R 211 , it is ensured that the circuit layer bears the minimum stress, to prevent damaging the circuit layer after the bending (for example, cracks, breakage and so on), which effectively ensures the reliability of the circuit layer. 
     In the processing of the display panel  100 , it is required to perform back-film removal to the bending area R 211 , i.e., removing a part of the back-film component  3  located within the bending area R 211 , to reduce the thickness of the back-film component  3  located within the bending area R 211 . For example, the back-film component  3  may be of a constant-thickness structure before the back-film removal. In the process of the back-film removal, for example, back-film removal using laser, a heat-affected area is formed on the two sides of the bending area R 211 , wherein the thickness of the back-film component  3  within the heat-affected area is greater than the thickness of the back-film component  3  before the back-film removal, and the controlling area R 212  is formed corresponding to the heat-affected area. 
     As shown in  FIGS.  1 - 5   , the display panel  100  has a marker The marker  5  is located within the non-active area R 2 , and the marker  5  is separately disposed around the depression part  21 . The marker  5  is separate from the boundary of the depression part  21  (for example., the third boundary S 3  and the fourth boundary S 4  described below), and the limiter  5  is disposed on at least one side of the depression part  21 , which includes the following cases. In the 1st case, the marker  5  is separately disposed on the side of the depression part  21  that is close to the active area R 1 . In the 2nd case, the marker  5  is separately disposed on the side of the depression part  21  that is away from the active area R 1 . In the 3rd case, markers  5  are disposed on one side of the depression part  21  that is close to the active area R 1  and the side of the depression part  21  that is away from. the active area R 1 . 
     The marker  5  is suitable for serving as the correction reference of the bending area R 211 . Accordingly, the marker  5  is suitable for serving as a precision reference of the boundary of the bending area R 211 , or, in other words, the marker  5  is suitable for serving as a precision reference of the back-film removal. That may effectively ensure that, in the precision correction of the back-film removal, the marker  5  may be normally identified, which ensures the normal correction of the precision of the back-film removal of the display panel  100 , and in turn improves the bending precision of the display panel  100 , to improve the product quality, and ensure the yield of the display panel  100 . Moreover, that facilitates to ensure that the display panel  100  is better suitable for the demand on further shrinking the border frame. 
     Furthermore, the marker  5  is separately disposed around the depression part  21 , whereby the marker  5  has a sufficient arrangement room, which facilitates the arrangement of the marker  5 , and facilitates to enable the marker  5  to have a suitable size, to ensure the normal identification in the precision correction of the back-film removal. 
     Accordingly, the present application is different from some techniques in which the boundary of the depression part  21  is used as the correction reference of the bending area R 211 ; in other words, the distance between the boundary of the bending area R 211  and the boundary of the depression part  21  is monitored. In those techniques, when the demand on further shrinking the border frame of the display panel  100  is to be met, because the border frame is further shrunken, the width of the depression part  21  is reduced correspondingly, which causes that the heat-affected area and the boundary of the depression part  21  easily interfere. Further, because the thickness of the back-film component  3  within the heat-affected area is not even, in the precision correction of the back-film removal, the boundary of the depression part  21  is abnormally identified, and the precision of the back-film removal cannot be ensured, which affects the yield of the bending of the display pita  100 . In the present application, by disposing the marker  5  on the display panel  100 , the marker  5  may be separately disposed around the depression part  21 , to effectively ensure that the marker  5  may be normally identified in the precision correction of the back-film removal, which ensures the precision of the back-film removal of the display panel  100 . increases the precision of the bending of the display panel  100 , and ensures the yield, whereby the display panel  100  may be better suitable for the demand on further shrinking the border frame. 
     For example, in the examples of  FIGS.  1  and  3   , the area corresponding to the depression part  21  is larger than the bending area R 211 , and accordingly the boundaries of the depression part  21  are located outside the corresponding boundaries of the bending area R 211 , to ensure that the circuit layer within the bending area R 211 , for example, the signal-line layer, to he located at the “neutral layer”. Further, the area corresponding to the depression part  21  may be larger than, equal to or smaller than the bending and controlling area R 21 . 
     In some embodiments, the filling member  4  is an MCL adhesive; in other words, the material of the filling member  4  is a UV adhesive. The thickness of the filling member  4  may be particularly set according to practical applications. 
     In some embodiments, as shown in  FIGS.  1  and  3   . a first boundary S 1  is formed between the bending area R 211  and the first controlling area R 212   a , and a second boundary S 2  is formed between the bending area R 211  and the second controlling area R 212   b  In other words, the first boundary S 1  is the boundary between the bending area R 211  and the first controlling area R 212   a , and the second boundary S 2  is the boundary between the bending area R 211  and the second controlling area R 212   b . A quantity of the marker is more than one and the markers include a first marker  51  and a second marker  52 . The first marker  51  is separately disposed on the side of the depression part  21  that is close to the active area R 1 , and the first marker  51  is suitable for serving as the correction reference of the first boundary S 1 . The second marker  52  is separately disposed on the side of the depression part  21  that is away from the active area R 1 , and the second marker  52  is suitable for serving as the correction reference of the second boundary S 2 . Accordingly, as compared with the second marker  52 , the distance between the first marker  51  and the first boundary S 1  is shorter, whereby, in the precision correction of the back-film removal, the first marker  51  and the first boundary S 1  may be located within the correction visual-field area at a same time, thereby ensuring the correction precision. Moreover, as compared with the first marker  51 , the distance between the second marker  52  and the second boundary S 2  is shorter, whereby, in the precision correction of the back-film removal, the second marker  52  and the second boundary S 2  may be located within the correction visual-field area at a same time, thereby ensuring the correction precision. 
     Certainly, the present application is not limited to what is described above. In some other embodiments, the marker  5  may also include a first marker  51  or a second marker  52 . For example, when the marker  5  includes the first marker  51  and does not include the second marker  52 . the first marker  51  is separately disposed on the side of the depression part  21  that is close to the active area R 1 , and in this case the first marker  51  is suitable for serving as the collection. reference of the first boundary S 1  and the second boundary S 2 . As another example. When the marker  5  includes the second marker  52  and does not include the first marker  51 , the second marker  52  is separately disposed on the side of the depression part  21  that is away from the active area R 1 , and in this case the second marker  52  is suitable for serving as the correction reference of the first boundary S 1  and the second boundary S 2 . Accordingly the marker  5  is flexibly configured, which facilitates to realize diversified design of the display panel  100 , to be better suitable for practical applications. 
     In some embodiments, as shown in  FIG.  1   , the marker  5  is suitable for serving as the correction reference of the depression part  21 . Accordingly, the marker  5  is suitable for serving as a precision reference of the boundary of the depression part  21 , to ensure the position precision of the depression part  21 . In this case, the marker  5  is suitable for serving as the correction references of the bending area R 211  and the depression part  21 , which facilitates to ensure the relative position precision of the depression part  21  and the bending area R 211 , to improve the product quality. 
     The bending area R 211  and the depression part  21  may use the same one marker  5  as the correction references, and may also use different markers  5  as the correction references. 
     In some embodiments, as shown in  FIGS.  1  and  3   , the depression part  21  has a third boundary S 3  and a fourth boundary S 4  that are opposite. A quantity of the marker is more than one and the plurality of markers  5  include a first marker  51  and a second marker  52 . The first marker  51  is separately disposed on the side of the depression part  21  that is close to the active area R 1 , and the first marker  51  is suitable for serving as the correction reference of the third boundary S 3 . The second marker  52  is separately disposed on the side of the depression part  21  that is away from the active area R 1 , and the second marker  52  is suitable for serving as the correction reference of the fourth boundary S 4 . Accordingly, as compared with the second marker  52 , the distance between the first marker  51  and the third boundary S 3  is shorter, whereby, in the precision correction, the first marker  51  and the third boundary S 3  may be located within the correction visual-field area at a same time, thereby ensuring the collection precision. Moreover, as compared with the first marker  51 , the distance between the second marker  52  and the fourth boundary S 4  is shorter, whereby, in the precision correction, the second marker  52  and the fourth boundary S 4  may be located within the correction visual-field area at a same time, thereby ensuring the correction precision. 
     For example, the distance between the marker  5  and the boundary of the depression part  21  may be approximately 150 μm. For example, when the marker  5  includes the first marker  51 , the distance between the first marker  51  and the boundary of the depression part  21  that is close to one side of the active area R 1  is approximately 150 μm, and when the marker  5  includes the second marker  52 , the distance between the second marker  52  and the boundary of the depression part  21  that is away from one side of the active area R 1  is approximately 150 μm. Certainly, the spacing between the marker  5  and the boundary of the depression part  21  may also be set to be other numerical values according to practical applications. 
     In some embodiments, as shown in  FIGS.  1  and  3   , the display panel  100  further includes a signal-line layer  6  located on the side of the depression part  21  that is away from the substrate  1 . The signal-line layer  6  is electrically connected to a data line  8  within the active area R 1 . Within the bending area R 211 , the signal-line layer  6  is disposed between the substrate  1  and the filling member  4 . For example, within the bending area R 211 , the depression part  21  extends throughout the multilayer insulating layer  2 . The orthographic projection of the depression part  21  on the substrate  1  is located within the orthographic projection of the signal-line layer  6  on the substrate  1 . Accordingly, the area corresponding to the signal-line layer  6  is larger than the area corresponding to the depression part  21 , which facilitates to realize the electric connection. between the signal-line layer  6  and the data line  8 . 
     It can be understood that, in the present application, the marker  5  is separately disposed. around the depression part  21 , and, accordingly, on the basis of that, the marker  5  may be disposed around the signal-line layer  6 , and/or the orthographic projection of the marker  5  on the substrate  1  is located within the orthographic projection of the signal-line layer  6  on the substrate  1 , which includes the following cases. In the 1st case, the marker  5  is separately disposed around the signal-line layer  6  (as shown in  FIGS.  3  and  4   ). In the 2nd case, the marker  5  is separately disposed around the depression part  21 , and the orthographic projection of the marker  5  on the substrate  1  is located within the orthographic projection of the signal-line layer  6  on the substrate  1  (as shown in  FIGS.  1  and  2   ). In the 3rd case, the markers  5  are disposed both within and outside the orthographic projection of the signal-line layer  6  on the substrate  1 . 
     For example, if the marker  5  includes the first marker  51 , and the first marker  51  is separately disposed on the side of the depression part  21  that is close to the active area R 1  , then the first marker  51  may be separately disposed on the side of the signal-line layer  6  that is close to the active area R 1  (as shown in  FIGS.  3  and  4   ), or the first marker  51  is separately disposed. around the depression part  21 , and the orthographic projection of the first marker  51  on the substrate  1  is located within the orthographic projection of the signal-line layer  6  on the substrate  1  (as shown in  FIGS.  1  and  2   ). As another example, if the marker  5  includes the second marker  52 , and the second marker  52  is separately disposed on the side of the depression part  21  that is away from the active area R 1 , then the second marker  52  may be separately disposed on the side of the signal-line layer  6  that is away from the active area R 1  (as shown in  FIGS.  3  and  4   ), or the second marker  52  is separately disposed around the depression part  21 , and the orthographic projection of the second marker  52  on the substrate  1  is located within the orthographic projection of the signal-line layer  6  on the substrate  1  (as shown in  FIGS.  1  and  2   ). Accordingly, the configuration of the position of the marker  5  is diverse, and the suitable position may be selected according to actual processes and so on. 
     In some embodiments, as shown in  FIGS.  1  and  3   , the depression part  21  includes a plurality of grooves  211  that are sequentially stacked in the direction perpendicular to the substrate  1 . One groove  211  among two neighboring grooves  211  that is close to the substrate  1  may be formed by depressing of a part of the bottom wall of the other groove  211 , and accordingly the two side :walls of the depression part  21  in the bending direction are individually formed with at least one step component  210 . The filling member  4  fills the plurality of grooves  211 , which facilitates to ensure that the signal-line layer  6  within the bending area R 211  is located at the “neutral layer”. Moreover, by disposing the plurality of grooves  211 , the length of the signal-line layer  6  may be increased to a certain extent, and the thickness of the insulating layer  2  corresponding to each of the grooves  211  is low, whereby the signal-line layer  6  is better suitable for the bending process of the display panel  100 . In the description of the present application, the meaning of “plurality of” is “two or more”. 
     For example, in the examples of  FIGS.  1  and  3   . a quantity of the step component  210  is one, the depression part  21  includes a first groove  211   a  and a second groove  211   b , the second groove  211   b  is located on the side of the first groove  211   a  that is close to the substrate  1 , the boundaries of the first groove  211   a  individually correspond to the third boundary S 3  and the fourth boundary S 4 , and the marker  5  is separately located on the side of the third boundary S 3  that is close to the active area R 1  and/or separately located on the side of the fourth boundary S 4  that is away .from the active area R 1 . Accordingly, the present application is different from some techniques in which the boundary S 5  of the second groove is used as the correction reference of the bending area R 211 . In those techniques, when the demand on further shrinking the border frame of the display panel  100  is to be met, because the border frame is further shrunken, the width of the depression part  21  is reduced correspondingly, which causes that the heat-affected area and the boundary S 5  of the second groove easily interfere. Further, because the thickness of the back-film component  3  within the heat-affected area is not even, in the precision correction of the back-film removal, the boundary S 5  of the second groove is abnormally identified, and the precision of the back-film removal cannot be ensured, which affects the yield of the bending of the display panel  100 . Tn the present application, by disposing the marker  5  on the display panel  100 , it is effectively ensured that the marker  5  may be normally identified in the precision. correction of the back-film removal, which ensures the precision of the back-film removal of the display panel  100 . 
     In the example of  FIG.  1   , the depression part  21  may extend throughout the insulating layer  2  in the thickness direction of the display panel  100 . For example, in the example of  FIG.  1   , the depression part  21  includes a first groove  211   a  and a second groove  211   b , the second groove  211   b  is located on the side of the first groove  211   a  that is close to the substrate  1 , and the second groove  211   b  extends throughout the multilayer insulating layer  2 . The multilayer insulating layer  2  may include multiple layers of inorganic substrates. 
     In some embodiments, as shown in  FIGS.  3  and  4   , the marker  5  is separately disposed. around the signal-line layer  6 , and the orthographic projection of the marker  5  on the substrate  1  does not overlap with the orthographic projection of the signal-line layer  6  on the substrate  1 . Accordingly, the orthographic projection of the marker  5  on the substrate  1  and the orthographic projection of the signal-line layer  6  on the substrate  1  are completely separated. In some other embodiments, as shown in  FIGS.  1  and  2   , the marker  5  is located on the side of the signal-line layer  6  that is close to the substrate  1 , the orthographic projection of the marker  5  on the substrate  1  is located within the area of the orthographic. projection of the signal-line layer  6  on the substrate  1 , and the boundary of the orthographic projection of the marker  5  on the substrate  1  and the boundary of the orthographic projection of the signal-line layer  6  on the substrate  1  are separate, to facilitate to ensure the effective identification on the marker  5 . In some other embodiments, as shown in  FIG.  5   , the signal-line layer  6  includes a plurality of connecting lines  61  that are separate, the marker  5  is disposed on the side of the signal-line layer  6  that is close to the substrate  1 , and the orthographic projection of the marker  5  on the substrate  1  is located between the orthographic projections of two neighboring connecting lines  61  on the substrate  1 , to facilitate to ensure the effective identification on the marker  5 . The mode of the arrangement of the connecting lines  61  may be particularly set according to practical applications. Accordingly, the position of the marker  5  is flexibly configured, which facilitates to realize diversified design of the display panel  100 . 
     In some embodiments, as shown in  FIGS.  1  and  3   , the marker  5  is located in the multilayer insulating layer  2 . For example, the marker  5  may be disposed between any two neighboring insulating layers  2  in the multilayer insulating layer  2 , to facilitate to ensure that the marker  5  may by effectively identified. For example, the marker  5  may be formed by etching, but is not limited thereto. 
     In some embodiments, the marker  5  may be disposed at a silicon layer or a metal layer in the multilayer insulating layer  2 . which further ensures the normal identification on the marker  5  in the precision correction of the back-film removal. 
     In some embodiments, as shown in  FIG.  2   . the bending area R 211  extends in the direction of the boundary of the active area R 1  (for example, the direction BB′ in  FIG.  2   ), a quantity of the markers  5  is more than one, and the plurality of markers  5  are separately arranged in the extending direction of the bending area R 211 , to facilitate to ensure the uniformity of the width of the bending area  82 . 11  in the direction of the boundary of the active area R 1 , which further ensures the precision of the back-film removal of the display panel  100 . 
     For example, in the example of  FIG.  2   , the quantity of the markers  5  is six, the six markers  5  include three first markers  51  and three second markers  52 , the three first markers  51  are separately arranged in the extending direction of the bending area R 211 , the three second markers  52  are separately arranged in the extending direction of the bending area R 211 , both of one of the first markers  51  and one of the second markers  52  are located substantially at a middle position of the bending area R 211  in its extending direction, and the other two first markers  51  and the other two second markers  52  are individually close to the two ends of the bending area R 211  in the extending direction. Certainly, the quantity of the markers  5  may also be two, three, four or more. 
     It can be understood that the shapes of the plurality of markers  5  may be the same or different. When the shapes of the plurality of markers  5  are the same, the placement angles of the plurality of markers  5  may be the same or different. For example, in the example of  FIG.  2   , the shapes of the plurality of markers  5  are the same, to facilitate identification, and the placement angles of the plurality of markers  5  are not completely the same. 
     In some embodiments, as shown in  FIG.  2   , the marker  5  is formed as a pattern marker. For example, the marker  5  may be formed as L shape, a cross shape, a polygonal shape, a circular shape or an elliptical shape and so on. Certainly, the shape of the marker  5  is not limited thereto; for example, the marker  5  may also be formed as a number marker. 
     For example, in the example of  FIG.  2   , the marker  5  is formed as an L shape, the marker  5  may include a first side and a second side, the first side and the second side may be perpendicularly connected, and the side edges of the bending area R 211  may be parallel to the first side or the second side. 
     A display device according to the embodiments in a second aspect of the present application includes the display panel  100  according to the embodiments in the first aspect of the present application. 
     The display device according to the embodiments of the present application, by using the display panel  100  stated above, is better suitable for the demand on further shrinking the border frame. 
     Furthermore, it should be noted that the particular type of the display device according to the embodiments of the present application is not limited. For example, it may be any products or components that have the function of displaying, such as a mobile phone, a monitor, a tablet personal computer, a television set, a notebook computer, a digital photo frame, a navigator and a wearable device. Furthermore, the other components and operations of the display device according to the embodiments of the present application, when the particular type of the display device has been determined, are known to a person skilled in the art, and are not described in detail herein. 
     In the description of the present application, it Should be understood that the terms that indicate orientation or position relations, such as “central”, “length”, “width”, “thickness”, “upper”, “lower”, “vertical”, “horizontal”, “inner” and “outer”, are based on the orientation or position relations shown in the drawings, and are merely for conveniently describing the present application and simplifying the description, rather than indicating or implying that the device or element must have the specific orientation and be constructed and operated according to the specific orientation. Therefore, they should not be construed as a limitation on the present application. 
     Furthermore, the terms “first” and “second” are merely for the purpose of describing, and should not be construed as indicating or implying the degrees of importance or implicitly indicating the quantity of the specified technical features. Accordingly, the features defined by “first” or “second” may explicitly or implicitly comprise one or more of the features. 
     In the present application, unless explicitly defined or limited otherwise, the terms “mount”, “connect”, “link” and “fix” should be interpreted broadly. For example, it may be fixed connection, detachable connection, or integral connection; it may be mechanical connection, may also be electric connection, and may also be communicative connection; and it may be direct connection or indirect connection by an intermediate medium, and may be internal communication between two elements or interaction between two elements. A person skilled in the art can determine the particular meaning of the terms in the present application according to particular situations. 
     In the present application, unless explicitly defined or limited otherwise, that a first feature is “over” or “under” a second feature may include that the first feature and the second feature directly contact or that the first feature and the second feature indirectly contact via an intermediate medium. Furthermore, that a first feature is “above” a second feature may include that the first feature is directly over or obliquely over the second feature, or merely indicates that the vertical height of the first feature is greater than that of the second feature. That a first feature is “below” a second feature may include that the first feature is directly under or obliquely under the second feature, or merely indicates that the vertical height of the first feature is less than that of the second feature. 
     In the description of the present application, the description referring to the terms “an embodiment”, “some embodiments”, “example”, “particular example” or “some examples” and so on means that particular features, structures, materials or characteristics described with reference to the embodiment or example are comprised in at least one of the embodiments or examples of the present application. In the description, the illustrative expressions of the above terms do not necessarily relate to the same embodiment or example. Furthermore, the described particular features, structures, materials or characteristics may be combined in one or more embodiments or examples in a suitable form. Furthermore, subject to avoiding contradiction, a person skilled in the art may combine different embodiments or examples described in the description and the features of the different embodiments or examples. 
     Although the embodiments of the present application have already been illustrated and described, a person skilled in the art can understand that those embodiments may have various alterations, modifications, substitutions and variations without departing from the principle and the spirit of the present application, and the scope of the present application is defined by the claims and the equivalents thereof.