Patent Publication Number: US-2023157101-A1

Title: Display substrate and manufacturing method therefor, and display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2021/116049, filed on Sep. 1, 2021, which claims priority to Chinese Patent Application No. 202011140933.2, filed on Oct. 22, 2020, which are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a manufacturing method therefor, and a display apparatus. 
     BACKGROUND 
     Display apparatuses, such as active-matrix organic light-emitting diode (AMOLED) display apparatuses, have advantages of being able to individually control each sub-pixel to perform display, high contrast ratio, bright colors and the like. However, a bezel area of the existing AMOLED display apparatus does not have stretchability, which makes it difficult to be applied to a curved display product. 
     SUMMARY 
     In an aspect, a display substrate is provided. The display substrate has a display area and a non-display area adjacent to the display area. The display substrate includes a flexible substrate and at least one signal line. The flexible substrate includes at least one stretchable region, and the stretchable region extends from the display area to the non-display area, and is provided with a plurality of holes arranged in an array therein. The at least one signal line is disposed on a first side of the flexible substrate and located in the non-display area, and an orthographic projection of a signal line on the flexible substrate is at least partially non-overlapping with each hole of the plurality of holes. 
     In some embodiments, the orthographic projection of the signal line on the flexible substrate is non-overlapping with each hole of the plurality of holes exactly. 
     In some embodiments, the signal line has at least one first avoidance opening, and an orthogonal projection of a border of the first avoidance opening on the flexible substrate is disposed around a hole. The display substrate further includes at least one isolation column disposed on the first side of the flexible substrate. An orthographic projection of a border of an isolation column on the flexible substrate is disposed around the hole, and the isolation column covers at least a sidewall of the first avoidance opening exposing the hole. 
     In some embodiments, the isolation column further covers a portion, proximate to the first avoidance opening, of a surface of the signal line away from the flexible substrate. 
     In some embodiments, the signal line includes a first metal layer and a second metal layer that are sequentially away from the flexible substrate. The isolation column includes a first organic insulating layer and a second organic insulating layer that are sequentially away from the flexible substrate. The first organic insulating layer covers a side of the first metal layer proximate to the hole and a portion of a surface of the first metal layer away from the flexible substrate; the second metal layer is in electrical contact with the first metal layer, and the second metal layer covers a side of the first organic insulating layer away from the hole and a portion of a surface of the first organic insulating layer away from the flexible substrate; the second organic insulating layer covers a side of the second metal layer proximate to the hole and a portion of a surface of the second metal layer away from the flexible substrate. 
     In some embodiments, the isolation column further includes a first inorganic insulating layer and a second inorganic insulating layer. A portion of the first inorganic insulating layer is located between the first organic insulating layer and the flexible substrate, another portion of the first inorganic insulating layer is located between the first metal layer and the second metal layer, and yet another portion of the first inorganic insulating layer is located between the first metal layer and the first organic insulating layer; the second inorganic insulating layer covers at least a portion of a surface of the second organic insulating layer away from the flexible substrate, a side of the second organic insulating layer proximate to the hole and a side of the first organic insulating layer proximate to the hole. The second inorganic insulating layer is in contact with to the first inorganic insulating layer. 
     In some embodiments, the display substrate further includes a light-emitting functional layer and a cathode layer that are sequentially disposed on the first side of the flexible substrate. The cathode layer extends from the display area to the non-display area, and a border of the cathode layer is located in the non-display area. The light-emitting functional layer extends from the display area to the non-display area, and an orthographic projection of the light-emitting functional layer on the flexible substrate is located within an orthographic projection of the cathode layer on the flexible substrate. An isolation column covered by the cathode layer is provided with a partition groove therein, the partition groove is disposed around the hole, and the partition groove is configured to partition the cathode layer or partition both the cathode layer and the light-emitting functional layer. 
     In some embodiments, the isolation column includes a second organic insulating layer and a second inorganic insulating layer, the second organic insulating layer and the second inorganic insulating layer are arranged in a stack, and the partition groove passes through the second inorganic insulating layer and at least a portion of the second organic insulating layer. 
     In some embodiments, a section obtained by sectioning the partition groove with a plane parallel to both of a radial direction of the hole and a thickness direction of the display substrate is substantially in a shape of an inverted “T”. 
     In some embodiments, the signal line is a voltage signal line, and the voltage signal line is disposed around the display area. The display substrate further includes a cathode lapping layer located in the non-display area. The cathode lapping layer includes a first portion and a second portion connected to each other, the first portion is electrically connected to a surface of the cathode layer proximate to the flexible substrate, and the second portion is connected to a surface of the voltage signal line away from the flexible substrate. The cathode lapping layer has at least one second avoidance opening, and an orthogonal projection of a border of a second avoidance opening on the flexible substrate is disposed around the hole. 
     In some embodiments, at least a portion of the isolation column covers a sidewall of the second avoidance opening; alternatively, at least a portion of the isolation column covers the sidewall of the second avoidance opening and a portion, proximate to the second avoidance opening, of a surface of the cathode lapping layer away from the flexible substrate. 
     In some embodiments, the display substrate further includes a first blocking dam, a second blocking dam, and an encapsulation layer. The first blocking dam is disposed on the first side of the flexible substrate, and the first blocking dam is located in the non-display area and disposed around the display area. The first blocking dam covers at least a side of the voltage signal line away from the display area and a side of the cathode lapping layer away from the display area; the first blocking dam has at least one third avoidance opening, and an orthogonal projection of a border of a third avoidance opening on the flexible substrate is disposed around the hole. The second blocking dam is disposed on the first side of the flexible substrate, and the second blocking dam is located in the non-display area and disposed around the display area. The second blocking dam is located on a surface of the second portion of the cathode lapping layer away from the flexible substrate; the second blocking dam has at least one fourth avoidance opening, and an orthogonal projection of a border of a fourth avoidance opening on the flexible substrate is disposed around the hole. The encapsulation layer is disposed on the first side of the flexible substrate, and the encapsulation layer covers the cathode layer, the first blocking dam and the second blocking dam; the encapsulation layer has at least one fifth avoidance opening, and an orthogonal projection of a border of a fifth avoidance opening on the flexible substrate is disposed around the hole. 
     In some embodiments, the display substrate further includes a buffer layer. The buffer layer is located on a surface of the first side of the flexible substrate, the buffer layer extends from the display area to the non-display area, and a border of the buffer layer is located on a side of the first blocking dam away from the display area. A portion of the buffer layer extending to the side of the first blocking dam away from the display area is provided with at least one groove therein, and the at least one groove is disposed around the first blocking dam. 
     In some embodiments, the display substrate further includes a third blocking dam covering the at least one groove in the buffer layer. 
     In some embodiments, the plurality of holes arranged in the array include first holes each extending in a first direction, and second holes each extending in a second direction intersecting the first direction. The first holes and the second holes are alternately arranged in both of the first direction and the second direction. 
     In another aspect, a display apparatus is provided. The display apparatus includes the display substrate as described in any one of the above embodiments. 
     In yet another aspect, a manufacturing method for a display substrate is provided. The display substrate has a display area and a non-display area adjacent to the display area. The manufacturing method includes: forming a plurality of holes arranged in an array in a stretchable region of a flexible substrate, the stretchable region extending from the display area to the non-display area; and forming at least one signal line on a first side of the flexible substrate, the signal line being located in the non-display area, and an orthographic projection of the signal line on the flexible substrate is at least partially non-overlapping with each hole of the plurality of holes. 
     In some embodiments, the signal line has at least one first avoidance opening, and an orthogonal projection of a border of a first avoidance opening on the flexible substrate is disposed around the hole. The manufacturing method further includes: forming at least one isolation column on the first side of the flexible substrate. An orthographic projection of a border of an isolation column on the flexible substrate is disposed around the hole, and the isolation column covers at least a sidewall of the first avoidance opening exposing the hole. 
     In some embodiments, the at least one isolation column includes isolation columns, and each isolation column includes a second organic insulating layer and a second inorganic insulating layer that are sequentially away from the flexible substrate. The manufacturing method further includes: etching the second inorganic insulating layer and at least a portion of the second organic insulating layer by an etching process to form a partition groove on a surface, away from the flexible substrate, of each of at least part of the isolation columns. The partition groove is disposed around the hole. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe technical solutions in the present disclosure more clearly, accompanying drawings to be used in some embodiments of the present disclosure will be introduced briefly below. Obviously, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these drawings. In addition, the accompanying drawings in the following description may be regarded as schematic diagrams, and are not limitations on actual sizes of products, actual processes of methods and actual timings of signals involved in the embodiments of the present disclosure. 
         FIG.  1    is a diagram showing a structure of a display substrate, in accordance with some embodiments; 
         FIG.  2    is a diagram showing a partial structure of the display substrate in  FIG.  1    in a stretchable region A; 
         FIG.  3 A  is a diagram showing a sectional structure in the stretchable region A in  FIG.  2    taken along the line B-B′; 
         FIG.  3 B  is a diagram showing another sectional structure in the stretchable region A in  FIG.  2    taken along the line B-B′; 
         FIG.  3 C  is a diagram showing a sectional structure of a display substrate to be processed to form holes therein, in accordance with some embodiments; 
         FIG.  4 A  is a diagram showing a sectional structure of a display substrate in which a cathode layer and a light-emitting functional layer are both partitioned, in accordance with some embodiments; 
         FIG.  4 B  is a diagram showing a sectional structure of a display substrate in which a cathode layer is partitioned, in accordance with some embodiments; 
         FIG.  4 C  is a diagram showing a sectional structure of a display substrate having a partition groove, in accordance with some embodiments; 
         FIG.  5    is a diagram showing a sectional structure of the display substrate in  FIG.  1    taken along the line C-C′, in accordance with some embodiments; 
         FIG.  6    is a diagram showing another sectional structure of the display substrate in  FIG.  1    taken along the line D-D′, in accordance with some embodiments; 
         FIG.  7    is a diagram showing a structure of a display apparatus, in accordance with some embodiments; 
         FIG.  8    is a flow diagram of a manufacturing method for a display substrate, in accordance with some embodiments; 
         FIG.  9    is a flow diagram of another manufacturing method for a display substrate, in accordance with some embodiments; and 
         FIG.  10    is a flow diagram of yet another manufacturing method for a display substrate, in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in some embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure shall be included in the protection scope of the present disclosure. 
     Unless the context requires otherwise, throughout the description and the claims, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” are construed as an open and inclusive meaning, i.e., “including, but not limited to”. In the description of the specification, the terms such as “one embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example” or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment(s) or example(s). In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any suitable manner. 
     Hereinafter, the terms such as “first” and “second” are used for descriptive purposes only, and are not to be construed as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with “first” or “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the term “a plurality of” or “the plurality of” means two or more unless otherwise specified. 
     The phrase “at least one of A, B and C” has the same meaning as the phrase “at least one of A, B or C”, and they both include the following combinations of A, B and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C. 
     The phrase “A and/or B” includes the following three combinations: only A, only B, and a combination of A and B. 
     The phrase “applicable to” or “configured to” as used herein indicates an open and inclusive expression, which does not exclude devices that are applicable to or configured to perform additional tasks or steps. 
     Additionally, the phase “based on” as used herein is meant to be open and inclusive, since a process, step, a calculation or other action that is “based on” one or more of the stated conditions or values may, in practice, be based on additional conditions or values beyond those stated. 
     Exemplary embodiments are described herein with reference to sectional views and/or plan views as idealized exemplary drawings. In the accompanying drawings, thicknesses of layers and sizes of regions are enlarged for clarity. Thus, variations in shape relative to the accompanying drawings due to, for example, manufacturing technologies and/or tolerances may be envisaged. Therefore, the exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but including shape deviations due to, for example, manufacturing. For example, an etched region shown in a rectangular shape generally has a feature of being curved. Therefore, the regions shown in the accompanying drawings are schematic in nature, and their shapes are not intended to show actual shapes of regions in a device, and are not intended to limit the scope of the exemplary embodiments. 
     Referring to  FIG.  1   , some embodiments of the present disclosure provide a display substrate  100 . The display substrate  100  has a display area Q 1  and a non-display area Q 2  adjacent to the display area Q 1 . The non-display area Q 2  may be located only on one or more sides of the display area Q 1 ; alternatively, the non-display area Q 2  may be disposed in a circle around the display area Q 1  according to the example as shown in  FIG.  1   . 
     As shown in  FIG.  3 A  to  6 , the display substrate  100  includes a flexible substrate  1  and at least one signal line  2  (e.g., a voltage signal line  20  or a clock signal line) disposed on a first side of the flexible substrate  1 . 
     As shown in  FIGS.  1  and  2   , the flexible substrate  1  include at least one stretchable region A, the stretchable region A extends from the display area Q 1  to the non-display area Q 2 , and the flexible substrate  1  is provided with a plurality of holes  3  arranged in an array in the stretchable region A. For example, the stretchable region A may be any one of four corners in the example as shown in  FIG.  1   . For another example, all of the flexible substrate  1  is the stretchable region A. That is, the stretchable region A covers all of the display area Q 1  and all of the non-display area Q 2 . In this way, the flexible substrate  1  may have basically the same stretchability in the display area Q 1  and the non-display area Q 2 . 
     In a process of manufacturing the display substrate  100 , holes  3  may be directly manufactured in a display substrate mother board, and then cutting is performed thereon to obtain the single display substrate  100 . On this basis, referring to  FIG.  2   , the corner of the display substrate  100  (i.e., a position in the triangular dotted box in  FIG.  2   ) may be cut to form a rounded corner, which facilitates application thereof in a display apparatus having a rounded corner. For example, as shown in  FIG.  2   , the corner to be cut is provided with holes  3  therein. 
     Specific arrangement manners of “the plurality of holes  3  arranged in the array” may vary. For example, as shown in  FIG.  2   , the plurality of holes  3  arranged in the array may include first holes  31  each extending in a first direction X and second holes  32  each extending in a second direction Y intersecting the first direction X. The first holes  31  and the second holes  32  are alternately arranged in both of the first direction X and the second direction Y. With this arrangement, it is conducive to making the flexible substrate  1  have good stretchability. 
     The second direction Y intersects the first direction X, which includes but is not limited to the manner that the second direction Y and the first direction X are perpendicular to each other as shown in  FIG.  2   . That is, an angle between the second direction Y and the first direction X is not limited to a right angle; alternatively, the angle may be an acute angle. 
     In some examples, as shown in  FIG.  3 A , the hole  3  is a via hole penetrating the flexible substrate  1 . In some other examples, as shown in  FIG.  3 B , the hole  3  is a blind hole. It will be understood that in a case where the hole  3  is the blind hole, the hole  3  only has an opening on the first side of the flexible substrate  1 . Moreover, the embodiments of the present disclosure do not limit a depth of the blind hole. That is, the depth of the blind hole may be determined according to the stretchability needed to be realized. For example, the greater the depth of the blind hole, the larger the stretchable range; and conversely, the less the depth of the blind hole, the smaller the stretchable range. 
     With continued reference to  FIGS.  1  and  2   , the signal line  2  is located in the non-display area Q 2 , and an orthographic projection of the signal line  2  on the flexible substrate  1  is at least partially non-overlapping with each hole  3  (e.g., the first hole  31  or the second hole  32 ) of the plurality of holes  3 . For example, when the signal line  2  is provided, with reference to the example as shown in  FIG.  2   , openings may be provided in the signal line  2  to achieve exposing the plurality of holes  3 . 
     “Being at least partially non-overlapping with each hole 3” may refer to that the orthographic projection of the signal line  2  on the flexible substrate  1  is partially non-overlapping with each hole  3 , or may refer to that the orthographic projection of the signal line  2  on the flexible substrate  1  is non-overlapping with each hole  3  exactly. 
     It is worth pointing out that in the display substrate  100 , the stretchable region A of the flexible substrate  1  extends from the display area Q 1  to the non-display area Q 2 , and the plurality of holes  3  arranged in the array are disposed in the stretchable region A of the flexible substrate  1 . Therefore, the flexible substrate  1  may be stretched in at least a portion of the display area Q 1  and at least a portion of the non-display area Q 2 . With this design, in a case where the display substrate  100  is applied to a display apparatus, it is easy to achieve an effect of curved display of the display apparatus by stretching the display substrate  100 . 
     Moreover, the orthographic projection of the signal line  2  located in the non-display area Q 2  on the flexible substrate  1  is at least partially non-overlapping with each hole  3 , so that the arrangement of the signal line  2  does not easily affect the arrangement positions of the holes  3  in the non-display area Q 2 . As a result, the stretchable region A of the flexible substrate  1  may have basically the same stretchability in the display area Q 1  and the non-display area Q 2 . 
     In some embodiments, as shown in  FIG.  2   , the signal line  2  has at least one first avoidance opening  21 , and an orthogonal projection of a border of a first avoidance opening  21  on the flexible substrate  1  is disposed around a hole  3 . For example, in the example as shown in  FIG.  2   , the orthogonal projection of the border of the first avoidance opening  21  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle. 
     It will be noted that,  FIG.  2    only shows an example in which the orthogonal projection of the border of the first avoidance opening  21  on the flexible substrate  1  is disposed around a single hole  3 . In other examples, the orthogonal projection of the border of the first avoidance opening  21  on the flexible substrate  1  may be disposed around two or more holes  3 , which is not limited in the embodiments of the present disclosure. 
     A sidewall of the first avoidance opening  21  may be in a shape of a closed annulus as shown in  FIG.  2   ; alternatively, the sidewall of the first avoidance opening  21  may be in a shape of a partial annulus with an opening as shown in  FIG.  2   . 
     On this basis, referring to  FIGS.  2 ,  3 A and  3 B , the display substrate  100  further includes at least one isolation column  4  disposed on the first side of the flexible substrate  1 . An orthographic projection of a border of an isolation column  4  on the flexible substrate  1  is disposed around the hole  3  (for example, the orthographic projection of the border of the isolation column  4  on the flexible substrate  1  may be disposed around the hole  3  in a circle; alternatively, the orthographic projection of the border of the isolation column  4  on the flexible substrate  1  may be disposed around the hole  3  in a half circle or a one-third circle), and the isolation column  4  covers at least the sidewall of the first avoidance opening  21  exposing the hole  3 . 
     In this way, the isolation column  4  may be used to protect a sidewall (i.e., the sidewall of the first avoidance opening  21 ) of the signal line  2  proximate to the hole  3 . For example, a material of the signal line  2  may generally include metal such as aluminum (Al). The isolation column  4  may prevent moisture from permeating from the hole  3  to the signal line  2 , thereby preventing problems such as corrosion of Al from occurring in the signal line  2 ; furthermore, during the subsequent etching process, it is possible to prevent a replacement reaction from undergoing between the Al in the signal line  2  and silver (Ag) ions in an etching solution. Therefore, the isolation column  4  may protect the signal line  2  effectively. 
     On this basis, for example, referring to  FIGS.  3 A and  3 B , the isolation column  4  further covers a portion, proximate to the first avoidance opening  21 , of a surface of the signal line  2  away from the flexible substrate  1 . In this way, the isolation column  4  may be used to better protect the signal line  2 . 
     In some embodiments, as shown in  FIGS.  3 A and  3 B , the signal line  2  includes a first metal layer  22  and a second metal layer  23  that are sequentially away from the flexible substrate  1 . In this way, it is conducive to reducing a resistance of the signal line  2  to improve a signal transmission efficiency. 
     On this basis, for example, as shown in  FIGS.  3 A and  3 B , the isolation column  4  includes a first organic insulating layer  41  and a second organic insulating layer  42  that are sequentially away from the flexible substrate  1 . 
     The first organic insulating layer  41  covers a side of the first metal layer  22  proximate to the hole  3  and a portion of a surface of the first metal layer  22  away from the flexible substrate  1 . 
     The second metal layer  23  is in electrical contact with the first metal layer  22 , and the second metal layer  23  covers a side of the first organic insulating layer  41  away from the hole  3  and a portion of a surface of the first organic insulating layer  41  away from the flexible substrate  1 . 
     The second organic insulating layer  42  covers a side of the second metal layer  23  proximate to the hole  3  and a portion of a surface of the second metal layer  23  away from the flexible substrate  1 . 
     With this design, the first organic insulating layer  41  and the second organic insulating layer  42  may be used to effectively protect the first metal layer  22  and the second metal layer  23  of the signal line  2 . 
     On this basis, for example, as shown in  FIGS.  3 A and  3 B , the isolation column  4  further includes a first inorganic insulating layer  43  and a second inorganic insulating layer  44 . 
     A portion of the first inorganic insulating layer  43  is located between the first organic insulating layer  41  and the flexible substrate  1 , another portion of the first inorganic insulating layer  43  is located between the first metal layer  22  and the second metal layer  23 , and yet another portion of the first inorganic insulating layer  43  is located between the first metal layer  22  and the first organic insulating layer  41 . 
     The second inorganic insulating layer  44  covers at least a portion of a surface of the second organic insulating layer  42  away from the flexible substrate  1 , a side of the second organic insulating layer  42  proximate to the hole  3  and a side of the first organic insulating layer  41  proximate to the hole  3 . The second inorganic insulating layer  44  is in contact with to the first inorganic insulating layer  43 . 
     In this way, the isolation column  4  has better barrier capability, so that the isolation column  4  may be used to protect the signal line  2  more effectively. 
     In the process of manufacturing the display substrate  100 , for example, after the structure shown in  FIG.  3 C  is formed (that is, after the second inorganic insulating layer  44  is manufactured), the hole  3  (e.g., the via hole shown in  FIG.  3 A  or the blind hole shown in  FIG.  3 B ) may be formed by an etching process. 
     In some embodiments of the present disclosure, as shown in  FIG.  4 A , the display substrate  100  further includes a light-emitting functional layer  51  (e.g., an electron transporting layer, an electron injection layer, an organic light-emitting layer, a hole injection layer and a hole transporting layer) and a cathode layer  52  that are sequentially disposed on the first side of the flexible substrate  1 . The cathode layer  52  extends from the display area to the non-display area, and a border of the cathode layer  52  is located in the non-display area. The light-emitting functional layer  51  extends from the display area to the non-display area, and an orthographic projection of the light-emitting functional layer  51  on the flexible substrate  1  is located within an orthographic projection of the cathode layer  52  on the flexible substrate  1 . 
     As shown in  FIGS.  4 A and  4 B , an isolation column  4  covered by the cathode layer  52  (including an isolation column  4  completely covered by the cathode layer  52  or an isolation column  4  partially covered by the cathode layer  52 ) is provided with a partition groove  45  therein, and an orthographic projection of the partition groove  45  on the flexible substrate  1  is disposed around the hole  3  (for example, for the isolation column  4  completely covered by the cathode layer  52 , the orthographic projection of the partition groove  45  therein on the flexible substrate  1  may be disposed around the hole  3  in a circle; for the isolation column  4  partially covered by the cathode layer  52 , the orthographic projection of the partition groove  45  therein on the flexible substrate  1  may be disposed around the hole  3  only in a half circle or a one-third circle). 
     The partition groove  45  is configured to partition both the light-emitting functional layer  51  and the cathode layer  52  (as shown in  FIG.  4 A ); alternatively, the partition groove  45  is configured to partition only the cathode layer  52  (as shown in  FIG.  4 B ). 
     In this way, after the display substrate is encapsulated, the moisture may be prevented from permeating from a side of the partition groove  45  proximate to the hole  3  to a side of the partition groove  45  away from the hole  3 , so as to ameliorate an influence of the moisture on the light-emitting functional layer  51  and the cathode layer  52 . 
     In some examples, referring to  FIG.  4 A , the display substrate  100  further includes an anode layer, and the anode layer includes a plurality of anodes  53  corresponding to a plurality of sub-pixels. For example, the anode  53  manufactured on the partition groove  45  may be attached to an inner wall of the partition groove  45 . 
     For example, referring to  FIGS.  4 A to  4 C , a section obtained by sectioning the partition groove  45  with a plane parallel to both of a radial direction Z of the hole  3  and a thickness direction M of the display substrate  100  is substantially in a shape of an inverted “T”. With this design, it is conducive to partitioning both of the light-emitting functional layer  51  and the cathode layer  52  when manufacturing the light-emitting functional layer  51  and the cathode layer  52 , so that the partitioned middle portions may be deposited at a bottom of the partition groove  45 . As a result, it is conducive for subsequent encapsulation layer to achieve good encapsulation. 
     Being substantially in the shape of the inverted “T” may refer to being in the described shape (i.e., the shape of the inverted “T”) or being in a shape similar to the described shape such as a shape of an inverted “T” whose border has a curvature or is in a shape of a zigzag. 
     For example, as shown in  FIGS.  4 A to  4 C , in a case where the isolation column  4  includes the second organic insulating layer  42  and the second inorganic insulating layer  44 , the partition groove  45  may pass through the second inorganic insulating layer  44  and at least a portion of the second organic insulating layer  42 . It is worth pointing out that, in some examples, by directly etching the second organic insulating layer  42  and the second inorganic insulating layer  44  that are arranged in a stack, the partition groove having the section substantially in the shape of the inverted “T” may be obtained. In this case, it is possible to have advantages of simple process and convenient manufacture. 
     In some embodiments, referring to  FIG.  1   , the signal line  2  may be the voltage signal line  20  located in the non-display area Q 2 , and the voltage signal line  20  may be disposed around the display area Q 1 . 
     Referring to  FIGS.  4 A,  4 B and  5   , the display substrate  100  further includes a cathode lapping layer  54  located in the non-display area Q 2 . As shown in  FIG.  5   , the cathode lapping layer  54  includes a first portion  543  and a second portion  544  connected to each other, the first portion  543  is electrically connected to a surface of the cathode layer  52  proximate to the flexible substrate  1 , and the second portion  544  is connected to a surface of the voltage signal line  20  away from the flexible substrate  1 . 
     The cathode lapping layer  54  has at least one second avoidance opening  541 , and an orthogonal projection of a border of the second avoidance opening  541  on the flexible substrate  1  is disposed around the hole  3  (for example, the orthogonal projection of the border of the second avoidance opening  541  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle). 
     With this design, the cathode lapping layer  54  located in the non-display area Q 2  may avoid the holes  3 . That is, the arrangement of the cathode lapping layer  54  does not affect the arrangement positions of the holes  3  in the non-display area Q 2 , so that the stretchable region A of the flexible substrate  1  may have basically the same stretchability in the display area Q 1  and the non-display area Q 2 . 
     For example, referring to  FIGS.  4 A and  4 B , at least a part of the isolation columns  4  covers a sidewall of the second avoidance opening  541 . In this way, the isolation column  4  may be used to protect a sidewall of the cathode lapping layer  54  proximate to the hole  3  (i.e., the sidewall of the second avoidance opening  541 ), thereby preventing the cathode lapping layer  54  from being corroded by moisture and oxygen, and preventing a replacement reaction from undergoing between metal in the cathode lapping layer  54  and metal ions in an etching solution. 
     For another example, at least a part of the isolation columns  4  covers the sidewall of the second avoidance opening  541  and a portion, proximate to the second avoidance opening  541 , of a surface of the cathode lapping layer  54  away from the flexible substrate  1 . In this way, the isolation column  4  may be used to better protect the cathode lapping layer  54 , thereby preventing the cathode lapping layer  54  from being corroded by moisture and oxygen, and preventing the replacement reaction from undergoing between the metal in the cathode lapping layer  54  and the metal ions in the etching solution. 
     The cathode lapping layer  54  and the anode  53  may be made in the same layer with the same material. In this way, it is conducive to simplifying the manufacturing process of the display substrate  100 . 
     On the basis of some of the above embodiments, for example, referring to  FIG.  5   , the display substrate  100  further includes a first blocking dam  61 , a second blocking dam  62  and an encapsulation layer  55 . 
     As shown in  FIG.  5   , the first blocking dam  61  is disposed on the first side of the flexible substrate  1 , and the first blocking dam  61  is located in the non-display area Q 2  and disposed around the display area Q 1 . The first blocking dam  61  covers at least a side of the voltage signal line  20  away from the display area Q 1  and a side of the cathode lapping layer  54  away from the display area Q 1 . The first blocking dam  61  has at least one third avoidance opening  610 , and an orthogonal projection of a border of a third avoidance opening  610  on the flexible substrate  1  is disposed around the hole  3  (for example, the orthogonal projection of the border of the third avoidance opening  610  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle). The third avoidance opening  610  is configured to not penetrate both of a side of the first blocking dam  61  proximate to the display area Q 1  and a side of the first blocking dam  61  away from the display area Q 1 . In this way, in the process of manufacturing the display substrate  100 , the first blocking dam  61  may block a material on a side thereof proximate to the display area from flowing to a side thereof away from the display area, so that the good encapsulation of the display substrate  100  may be achieved. 
     For example, as shown in  FIG.  5   , the first blocking dam  61  further covers a portion (i.e., a portion, proximate to the first blocking dam  61 , of the entire surface of the voltage signal line  20  away from the flexible substrate  1 ) of the surface of the voltage signal line  20  away from the flexible substrate  1  and a portion (i.e., a portion, proximate to the first blocking dam  61 , of the entire surface of the cathode lapping layer  54  away from the flexible substrate  1 ) of the surface of the cathode lapping layer  54  away from the flexible substrate  1 . 
     With continued reference to  FIG.  5   , in some examples, the first blocking dam  61  may be of a three-layer structure. For example, in a direction away from the flexible substrate  1 , a first layer thereof and a planarization layer  56  may be made in a same layer with a same material, a second layer thereof and a pixel definition layer  57  may be made in a same layer with a same material, and a third layer thereof and a filling layer  58  may be made in a same layer with a same material. 
     The planarization layer  56  may include the first organic insulating layer and/or the second organic insulating layer. 
     The pixel definition layer  57  extends from the display area Q 1  to the non-display area Q 2 , and a border of the pixel definition layer  57  is located in the non-display area Q 2 . The pixel definition layer  57  has openings used to define a plurality of sub-pixel regions. 
     In some examples, as shown in  FIG.  5   , the cathode lapping layer  54  has a plurality of holes  542  arranged in an array, and at least one hole  542  of the plurality of holes  542  penetrates the cathode lapping layer  54 . Orthogonal projections of at least a part of holes  542  of the plurality of holes  542  on the flexible substrate  1  are within an orthographic projection of the planarization layer  56  on the flexible substrate  1 . In this way, in the process of manufacturing the display substrate  100 , it is possible to release gas generated in a film layer (e.g., the planarization layer  56 ) below the cathode lapping layer  54 , thereby improving a reliability of the display substrate. 
     The filling layer  58  may be used to fill the holes  542  in the cathode lapping layer  54 . In this way, an upper surface of the cathode lapping layer  54  may be planarized to facilitate manufacturing of other film layers on the cathode lapping layer  54 . 
     Here, it will be noted that in a case where the cathode layer  52  overlaps with the cathode lapping layer  54 , a region where they are actually electrically connected is in a shape of a mesh, and a portion filled with a material of the filling layer in the middle of the mesh is non-conductive. 
     As shown in  FIG.  5   , the second blocking dam  62  is disposed on the first side of the flexible substrate  1 , and the second blocking dam  62  is located in the non-display area Q 2  and disposed around the display area Q 1 . The second blocking dam  62  is located on a surface of the second portion  544  of the cathode lapping layer  54  away from the flexible substrate  1 . The second blocking dam  62  has at least one fourth avoidance opening  620 , and an orthogonal projection of a border of a fourth avoidance opening  620  on the flexible substrate  1  is disposed around the hole  3  (for example, the orthogonal projection of the border of the fourth avoidance opening  620  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle). 
     For example, as shown in  FIG.  5   , the fourth avoidance opening  620  may expose the second avoidance opening  541 , the first avoidance opening  21  and the hole  3  in sequence. 
     In some examples, the second blocking dam  62  may be of a double-layer structure. For example, in the direction away from the flexible substrate  1 , a first layer thereof and the pixel definition layer  57  may be made in a same layer with a same material, and a second layer thereof and the filling layer  58  may be made in a same layer with a same material. 
     Referring to  FIGS.  5  and  6   , the encapsulation layer  55  is disposed on the first side of the flexible substrate  1 , and the encapsulation layer  55  covers the cathode layer  52 , the first blocking dam  61  and the second blocking dam  62 ; the encapsulation layer  55  has at least one fifth avoidance opening  551 , and an orthogonal projection of a border of the fifth avoidance opening  551  on the flexible substrate  1  is disposed around the hole  3  (for example, the orthogonal projection of the border of the fifth avoidance opening  551  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle). 
     In some embodiments of the present disclosure, referring to  FIGS.  3 A,  3 B,  4 A to  4 C,  5  and  6   , the display substrate  100  may further include a buffer layer  11  located on the first side of the flexible substrate  1 . The buffer layer  11  extends from the display area Q 1  to the non-display area Q 2 , and a border of the buffer layer  11  is located on the side of the first blocking dam  61  away from the display area Q 1 . The buffer layer  11  has openings exposing the holes  3 . 
     On this basis, for example, as shown in  FIG.  5   , a portion of the buffer layer  11  extending to the side of the first blocking dam  61  away from the display area Q 1  has at least one groove  110  formed therein, and the groove  110  is disposed around the first blocking dam  61 . In this way, in the process of manufacturing the display substrate  100 , the groove  110  may prevent outer cracks from extending inward to affect the display area Q 1 , thereby improving the reliability of the display substrate  100 . 
     For example, as shown in  FIG.  5   , a third blocking dam  63  may be provided on a side of the groove  110  away from the flexible substrate  1 . It may be possible to achieve a good effect of avoiding the extension of the cracks may be better by the third blocking dam  63 . 
     Some embodiments of the present disclosure provide a display apparatus  200 , as shown in  FIG.  7   , the display apparatus  200  includes the display substrate  100  as described in any one of the above embodiments. 
     For example, the display apparatus  200  may be, for example, any product or component having a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame or a navigator. 
     As for technical effects of the display device  200 , reference may be made to technical effects of the display substrate as described in any one of the above embodiments, and details will not be repeated here. 
     Some embodiments of the present disclosure provide a manufacturing method of a display substrate, referring to  FIGS.  1  and  2   , the display substrate  100  has a display area Q 1  and a non-display area Q 2  adjacent to the display area Q 1 . Referring to  FIG.  8   , the manufacturing method includes S 1  and S 2 . 
     In S 1 , a plurality of holes  3  arranged in an array are formed in a stretchable region A of a flexible substrate  1 , and the stretchable region A extends from the display area Q 1  to the non-display area Q 2 . 
     In S 2 , at least one signal line  2  is formed on a first side of the flexible substrate  1 , the signal line  2  is located in the non-display area Q 2 , and an orthographic projection of a signal line  2  on the flexible substrate  1  is at least partially non-overlapping with each hole  3  of the plurality of holes  3 . 
     For example, as shown in  FIG.  2   , the signal line  2  has at least one first avoidance opening  21 , and an orthogonal projection of a border of a first avoidance opening  21  on the flexible substrate  1  is disposed around a holes  3  (for example, in the example as shown in  FIG.  2   , the orthographic projection of the border of the first avoidance opening  21  on the flexible substrate  1  may be disposed around the hole  3  in a circle, or may be disposed around the hole  3  in a half circle or a one-third circle). On this basis, referring to  FIGS.  3 A,  3 B and  9   , the manufacturing method further includes S 3 . 
     In S 3 , at least one isolation column  4  is formed on the first side of the flexible substrate  1 , an orthographic projection of a border of an isolation column  4  on the flexible substrate  1  is disposed around the hole  3 , and the isolation column  4  covers at least a sidewall of the first avoidance opening  21  exposing the hole  3 . 
     For example, referring to  FIGS.  4 A and  4 B , the isolation column  4  includes a second organic insulating layer  42  and a second inorganic insulating layer  44  that are sequentially away from the flexible substrate  1 . Referring to  FIG.  10   , the manufacturing method may further include S 4 . 
     In S 4 , the second inorganic insulating layer  44  and at least a portion of the second organic insulating layer  42  are etched by an etching process to form a partition groove  45  on a surface, away from the flexible substrate  1 , of each of at least part of the isolation columns  4 ; the partition groove  45  is disposed around the hole  3 . A material of the isolation column  4  and the shape of the partition groove  45  are described in detail above, and will not be repeated here. 
     The manufacturing method of the display substrate provided by some embodiments of the present disclosure is used to manufacture the display substrate  100  as described in any one of the above embodiments. Therefore, the manufactured display substrate  100  has all of the beneficial effects described above, and details will not be repeated here. 
     The foregoing descriptions are merely specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Changes or replacements that any person skilled in the art could conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.