Patent Publication Number: US-2022238618-A1

Title: Display substrate and display device

Description:
RELATED APPLICATION 
     This application claims the priority of the Chinese patent application with the application number 202110121161.6 filed on Jan. 28, 2021, and the entire content of the application is incorporated herein by reference. 
     FIELD 
     The present disclosure relates to the field of display technologies, and in particular to a display substrate and a display device. 
     BACKGROUND 
     With the continuous development of science and technology, users have increasingly higher pursuit of the screen-to-body ratio of the display device (the ratio of the area of the display screen to the area of the front panel of the display device). 
     In related technical fields, the concept of a full screen has emerged, that is, optical devices such as image collectors in the display device are placed below the display screen to increase the ratio between area of the display screen and the area of front panel of the display device, and the ratio is close to 100%. 
     SUMMARY 
     In one aspect, embodiments of the present disclosure provide a display substrate, the display substrate comprising a display area and a frame area, the display substrate comprising: a substrate; a plurality of sub-pixels on a side of the substrate, the plurality of sub-pixels being configured to emit light in the display area; an encapsulation layer on a side of the plurality of sub-pixels away from the substrate; and a retaining wall in the frame area, wherein the retaining wall is between the encapsulation layer and the substrate and comprises a first sub-retaining wall, a second sub-retaining wall, and a transition area between the first sub-retaining wall and the second sub-retaining wall, wherein the second sub-retaining wall is on a side of the first sub-retaining wall away from the display area, the vertical distance between the end of the second sub-retaining wall away from the substrate and the substrate is greater than the vertical distance between the end of the first sub-retaining wall away from the substrate and the substrate, the vertical distance between the end of the first sub-retaining wall away from the substrate and the substrate is greater than the vertical distance between the end of the transition area away from the substrate and the substrate; and wherein, the retaining wall comprises at least one layer provided in the same layer, the at least one layer provided in the same layer continuously extends across the first sub-retaining wall, the second sub-retaining wall and the transition area. 
     In some embodiments, the display area comprises a first display area and a second display area, and the plurality of sub-pixels comprises a plurality of first sub-pixels and a plurality of second sub-pixels, wherein the plurality of first sub-pixels are in the first display area, and each first sub-pixel of the plurality of first sub-pixels comprises a first pixel drive circuit and a first light-emitting device electrically connected to the first pixel drive circuit; each second sub-pixel of the plurality of second sub-pixels comprises a second pixel drive circuit and a second light-emitting device electrically connected to the second pixel drive circuit, the second light-emitting device is in the second display area, the plurality of second sub-pixels comprises a plurality of second pixel drive circuits, at least one second pixel drive circuit of the plurality of second pixel drive circuits is not in the second display area; and the first sub-retaining wall is on a side of the at least one second pixel drive circuit away from the display area. 
     In some embodiments, the display substrate comprises a first flat layer, the at least one layer provided in the same layer comprises a first layer provided in the same layer, and wherein, the first layer provided in the same layer is provided in the same layer as the first flat layer. 
     In some embodiments, the display substrate further comprises a second flat layer, a third flat layer, and a fourth flat layer sequentially arranged on the first flat layer, the at least one layer provided in the same layer also comprise a second layer provided in the same layer, a third layer provided in the same layer, and a fourth layer provided in the same layer sequentially arranged on the first layer provided in the same layer, and wherein, the second layer provided in the same layer is provided in the same layer as the second flat layer, the third layer provided in the same layer is provided in the same layer as the third flat layer, and the fourth layer provided in the same layer is provided in the same layer as the fourth flat layer. 
     In some embodiments, the display substrate further comprises a fifth flat layer on the fourth flat layer, the second sub-retaining wall further comprises a fifth flat layer on the fourth layer provided in the same layer, and wherein, the fifth layer comprised in the second sub-retaining wall is provided in the same layer as the fifth flat layer, and the orthographic projection of the fifth layer comprised in the second sub-retaining wall on the substrate does not overlap with the orthographic projections of the transition area and the first sub-retaining wall on the substrate. 
     In some embodiments, the display substrate further comprises a pixel defining layer on the fifth flat layer, and the second sub-retaining wall further comprises a sixth layer on the fifth layer, the first sub-retaining wall further comprises a fifth layer on the fourth layer provided in the same layer, and wherein, the sixth layer comprised in the second sub-retaining wall, the fifth layer comprised in the first sub-retaining wall, and the pixel defining layer are provided in the same layer, and the orthographic projection of the sixth layer comprised in the second sub-retaining wall on the substrate and the orthographic projection of the fifth layer comprised in the first sub-retaining wall on the substrate do not overlap with the orthographic projection of the transition area on the substrate. 
     In some embodiments, the display substrate further comprises at least one conduction layer, wherein the second pixel drive circuit in the frame area is electrically connected to the corresponding second light emitting device through the at least one conduction layer, and the display substrate further comprises: a flat layer between the at least one conduction layer and the second pixel drive circuit; and a flat layer between the at least one conduction layer and the second light emitting device. 
     In some embodiments, the at least one conduction layer comprises a plurality of conduction layers, and the display substrate further comprises a flat layer between two adjacent conduction layers among the plurality of conduction layers. 
     In some embodiments, the plurality of conduction layers comprises a first conduction layer, a second conduction layer, and a third conduction layer, and the display substrate comprises the first flat layer, the second flat layer, the third flat layer, the fourth flat layer and the fifth flat layer sequentially arranged on the substrate; the second pixel drive circuit is between the substrate and the first flat layer; the first conduction layer is between the second flat layer and the third flat layer; the second conduction layer is between the third flat layer and the fourth flat layer; the third conduction layer is between the fourth flat layer and the fifth flat layer; and the second light emitting device is on a side of the fifth flat layer away from the substrate. 
     In some embodiments, the at least one conduction layer is light-transmissive. 
     In some embodiments, the display substrate further comprises: a barrier layer; the first end of the barrier layer extends into the first sub-retaining wall, and the second end of the barrier layer extends between the two flat layers comprised in the display substrate. 
     In some embodiments, the first end of the barrier layer is between the second layer provided in the same layer and the third layer provided in the same layer, and the second end of the barrier layer is between the second flat layer and the third flat layer. 
     In some embodiments, the first end of the barrier layer is between the third layer provided in the same layer and the fourth layer provided in the same layer, and the second end of the barrier layer is between the third flat layer and the fourth flat layer. 
     In some embodiments, the first end of the barrier layer is between the fourth layer provided in the same layer and the fifth layer comprised in the first sub-retaining wall, and the second end of the barrier layer is between the fourth flat layer and the fifth flat layer. 
     In some embodiments, the barrier layer is provided in the same layer as one of the first conduction layer, the second conduction layer, and the third conduction layer, and the barrier layer is not electrically connected to the first conduction layer, the second conduction layer or the third conduction layer. 
     In some embodiments, the encapsulation layer comprises: a first inorganic layer on the retaining wall; an organic layer on a side of the first inorganic layer away from the substrate; and a second inorganic layer on a side of the organic layer away from the substrate. 
     In some embodiments, at least one second pixel drive circuit of the plurality of second pixel drive circuits is in the frame area. 
     In some embodiments, the organic layer is prepared by a printing process. 
     In another aspect, embodiments of the present disclosure provide a display device comprising: the above-mentioned display substrate; and the optical device on the opposite side of the light-emitting side of the display substrate, wherein, at least part of the second display area of the display substrate is in the field of view of the optical device. 
     In some embodiments, the frame area of the display substrate comprises a binding area, the display device further comprises: a touch structure on the light-emitting side of the display substrate, the orthographic projection of the touch structure on the substrate at least partially overlaps with the orthographic projection of the display area on the substrate; a touch driving chip in the binding area; and a plurality of signal transmission lines electrically connected to the touch structure and the touch driving chip, the orthographic projections of the plurality of signal transmission lines on the substrate at least partially overlaps with the orthographic projection of the transition area on the substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to explain the technical solutions of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in some embodiments of the present disclosure. Obviously, the drawings in the following description are merely drawings for some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not intended to limit the actual sizes of the products involved in the embodiments of the present disclosure. 
         FIG. 1  is a structural diagram of a display substrate according to some embodiments of the present disclosure; 
         FIG. 2  is a partial structure diagram of a display substrate according to some embodiments of the present disclosure; 
         FIG. 3  is a partial structure diagram of another display substrate according to some embodiments of the present disclosure; 
         FIG. 4  is a partial structure diagram of still another display substrate according to some embodiments of the present disclosure; 
         FIG. 5  is a partial structure diagram of another display substrate according to some embodiments of the present disclosure; 
         FIG. 6  is a structural diagram of a display device according to some embodiments of the present disclosure; 
         FIG. 7  is a structural diagram of another display device according to some embodiments of the present disclosure; 
         FIG. 8  is a partial structure diagram of a display device according to some embodiments of the present disclosure; 
         FIG. 9  is a partial structure diagram of a display device according to some embodiments of the present disclosure; and 
         FIG. 10  is a top view of a partial structure diagram of a display device according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present disclosure. 
     Unless the context requires otherwise, throughout the specification and claims, the term “comprising” is interpreted as an open and inclusive meaning, that is, “comprising, but not limited to”. In the description of the specification, the terms “one embodiment”, “some embodiments”, “exemplary embodiments”, “examples” or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or example are comprised in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described may be comprised in any one or more embodiments or examples in any suitable manner. 
     Hereinafter, the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly comprise one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, “a plurality of” means two or more. 
     “A and/or B” comprises the following three combinations: A only, B only, and a combination of A and B. 
     As used herein, depending on the context, the term “if” is optionally interpreted as meaning “when” or “at the time when” or “in response to a determination of” or “in response to a detection of”. Similarly, depending on the context, the phrase “if it is determined . . . ” or “if [the stated condition or event] is detected” is optionally interpreted to mean “when determining . . . ” or “in response to determining . . . ” or “when [the stated condition or event] is detected” or “in response to detecting [the stated condition or event]”. 
     The use of “applicable to” or “configured to” in this document means an open and inclusive language, which does not exclude devices applicable to or configured to perform additional tasks or steps. 
     In addition, the use of “based on” means openness and inclusiveness, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values may be based on additional conditions or exceed the stated values in practice. 
     As used herein, “about” or “approximately” comprises the stated value as well as the average value within the acceptable deviation range of the specified value, where the acceptable deviation range is determined by those of ordinary skill in the art by taking the measurement and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system) into account. 
     The exemplary embodiments are described herein with reference to cross-sectional views and/or plan views as idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in the shape with respect to the drawings due to, for example, manufacturing technology and/or tolerances can be envisaged. Therefore, the exemplary embodiments should not be construed as being limited to the shape of the area shown herein, but comprise shape deviations due to, for example, manufacturing. For example, the etched area shown as a rectangle will generally have curved features. Therefore, the areas shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shape of the area of the device, and are not intended to limit the scope of the exemplary embodiments. 
     Display devices generally comprise Liquid Crystal Display (LCD), Organic Light Emitting Diode (OLED) display devices, and Quantum Dot Light Emitting Diodes (QLED) display devices. Taking into account the structure and display principle of the LCD, it is difficult for external light to pass through the back light module, so it is difficult to arrange optical devices such as image collectors under the display. The external light can pass through the gap between two adjacent sub-pixels in the OLED display device (or QLED display device), and can be emitted from the light-emitting side of the OLED display device (or QLED display device) to the non-light-emitting side of the OLED display device (or QLED display device). Therefore, OLED display devices (or QLED display devices) are currently mainly used to achieve a full-screen design. In related technologies, the concept of a full screen has emerged, that is, optical devices such as image collectors in the display device are below the display screen to increase the ratio between area of the display screen and the area of front panel of the display device, and the ratio is close to 100%. 
     Some embodiments of the present disclosure provide a display device  1000 . As shown in  FIGS. 6 to 8 , the display device  1000  comprises a display substrate  100  and an optical device  500 . In some embodiments, the display device  1000  further comprises a touch structure  200 , a touch driving chip  300 , and a plurality of signal transmission lines  400 . 
     There are many types of the above-mentioned optical device  500 , which may be selected and set according to actual needs. In some examples, the above-mentioned optical device  500  may be, for example, a camera, an infrared receiver, or an infrared transmitter etc. 
     In some examples, as shown in  FIG. 1 , the above-mentioned display substrate  100  has a display area A and a frame area B. The portion of the display substrate  100  located in the display area A can perform image display. 
     It should be noted that, the present disclosure does not limit the location of the frame area B. The frame area B can be located on one side, two sides, or three sides of the display area A. Of course, the frame area B can also be located on the periphery of the display area A. 
     In some examples, as shown in  FIG. 1 , the display area A comprises a first display area A 1  and a second display area A 2 . The area of the first display area A 1  may be larger than the area of the second display area A 2 , for example. 
     Here, the number of the second display area A 2  may be one or multiple, and may be selected and set according to actual needs. 
     The above-mentioned positional relationship between the first display area A 1  and the second display area A 2  comprises multiple types, which may be selected and set according to actual needs. 
     Exemplarily, the first display area A 1  may be located at the periphery of the second display area A 2 , that is, the first display area A 1  surrounds the second display area A 2 . At this time, the shape of the second display area A 2  may be, for example, a circle, an ellipse, or a rectangle. 
     Exemplarily, as shown in  FIG. 1 , the second display area A 2  is located beside the first display area A 1 , that is, a part of the boundary of the second display area A 2  overlaps with a part of the boundary of the first display area A 1 . At this time, the shape of the second display area A 2  may be, for example, a rectangle, a rounded rectangle, a drop shape, or a semicircle. 
     In some examples, as shown in  FIG. 1 , the frame area B comprises at least one binding area B 1 . There may be a gap between the display area A and the binding area B 1 . 
     In the following, taking the optical device  500  is a camera, the number of the second display area A 2  is one, the number of the binding area B 1  is one, and the second display area A 2  is located next to the first display area A 1  as an example, the structure of the display device  1000  is schematically illustrated. 
     In some examples, as shown in  FIG. 8 , the optical device  500  is on the opposite side of the light-emitting side of the display substrate  100 , and at least part of the second display area A 2  of the display substrate  100  may be located in the field of view of the optical device  500 . The external light can pass through the display substrate  100  and enter the optical device  500 , so that the optical device  500  can work. 
     In some examples, as shown in  FIG. 8 , the above-mentioned touch structure  200  may be on the light-emitting side of the display substrate  100 , and the orthographic projection of the touch structure  200  on the substrate of the display substrate  100  at least partially overlaps with the orthographic projection of the display area A on the substrate of the display substrate  100 . In some embodiments, the optical device  500  and the touch structure  200  are located on opposite sides of the display substrate  100 . 
     In this way, the user can use the touch structure  200  to control the image to be displayed on the display substrate  100 , so that the display device  1000  has both a display function and a touch function. 
     In some examples, as shown in  FIG. 7 , the touch driving chip  300  may be in the binding area B 1  and located on the same side of the display substrate  100  as the touch structure  200 . The touch driving chip  300  may transmit touch driving signals to the touch structure  200 , and may also receive touch sensing signals transmitted by the touch structure  200 , so that the user can realize a control of the image to be displayed on the display substrate  100  through the touch structure  200 . 
     In some examples, as shown in  FIG. 7 , multiple signal transmission lines  400  are located on the same side of the display substrate  100  as the touch structure  200  and the touch driving chip  300 . One end of each signal transmission line  400  extends into the display area A and is electrically connected to the touch structure  200 , and the other end extends into the binding area B 1  and is electrically connected to the touch driving chip  300 . In this way, the touch driving chip  300  and the touch structure  200  may realize the transmission of touch driving signals and touch sensing signals through the signal transmission line  400 . 
     In some embodiments, since the touch structure  200  is located in the display area A and the touch driving chip  300  is located in the binding area B 1 , this also means that the signal transmission line  400  needs to pass through the frame area B to realize electrical connection between the touch structure  200  and the touch driving chip  300 . 
     The structure of the display substrate  100  provided by some embodiments of the present disclosure will be schematically described below with reference to the accompanying drawings. 
     In some examples, as shown in  FIG. 1 , the display substrate  100  may comprise: a substrate  1 . 
     There are many types of the above-mentioned substrate  1 , which may be selected and set according to actual needs. 
     Exemplarily, the aforementioned substrate  1  may be a rigid substrate. The rigid substrate may be a glass substrate or a Polymethyl methacrylate (PMMA) substrate or the like. 
     Exemplarily, the aforementioned substrate  1  may be a flexible substrate. The flexible substrate may be a Polyethylene terephthalate (PET) substrate, a Polyethylene naphthalate two formic acid glycol ester (PEN) substrate, or a Polyimide (PI) substrate, etc. 
     In some examples, as shown in  FIG. 1 , the display substrate  100  may further comprise a plurality of sub-pixels P on one side of the substrate  1 , and the plurality of sub-pixels P are configured to emit light in the display area A. The plurality of sub-pixels P comprise a plurality of first sub-pixels P 1  and a plurality of second sub-pixels P 2 . 
     Exemplarily, the plurality of first sub-pixels P 1  are located in the first display area A 1 , and each first sub-pixel P 1  of the plurality of first sub-pixels comprises a first pixel drive circuit and a first light-emitting device. The first light-emitting device may be located on a side of the first pixel drive circuit away from the substrate  1  and electrically connected to the first pixel drive circuit. The first pixel drive circuit can provide a driving voltage to the first light-emitting device to control the light-emitting state of the first light-emitting device. As shown in  FIGS. 1 and 2 , each second sub-pixel P 2  comprises a second pixel drive circuit  21  and a second light emitting device  22 . The second light emitting device  22  may be located on a side of the second pixel drive circuit  21  away from the substrate  1  and electrically connected to the second pixel drive circuit  21 . The second pixel drive circuit  21  can provide a driving voltage to the second light-emitting device  22  to control the light-emitting state of the second light-emitting device  22 . The plurality of first sub-pixels P 1  and the plurality of second sub-pixels P 2  may cooperate with each other, so that the display substrate  100  can perform image display. 
     In some embodiments, the structure of the first pixel drive circuit comprised in the first sub-pixel P 1  may be the same as or similar to the structure of the second pixel drive circuit  21  comprised in the second sub-pixel P 2 . The structure of the first light-emitting device comprised in the first sub-pixel P 1  may be the same as or similar to the structure of the second light-emitting device  22  comprised in the second sub-pixel P 2 . 
     It should be noted that, the structure of the second pixel drive circuit  21  may comprise multiple types, which are not limited in the present disclosure. For example, the structure of the second pixel drive circuit  21  may be a structure such as “6T1C”, “7T1C”, “6T2C” or “7T2C”. Here, “T” represents thin film transistors, the number before “T” represents the number of thin film transistors, “C” represents storage capacitors, and the number before “C” represents the number of storage capacitors. 
     For example, the thin film transistor comprised in the second pixel drive circuit  21  may be a thin film transistor with a bottom gate structure. For another example, the thin film transistor comprised in the second pixel drive circuit  21  may be a thin film transistor with a top gate structure. 
     The above-mentioned second light emitting device  22  may be, for example, an Organic Light Emitting Diode (OLED) device or a Quantum Dot Light Emitting Diodes (QLED) device. The light emitting mode of the second light emitting device  22  may be top emitting light or bottom emitting light, for example. 
     The present disclosure is schematically illustrated taking the thin film transistor comprised in the second pixel drive circuit  21  is a thin film transistor with a top gate structure, the second light emitting device  22  is an OLED light emitting device, and the light emitting mode of the second light emitting device  22  is top emitting light as an example. 
     Exemplarily, as shown in  FIG. 2 , the first pixel drive circuit in the first sub-pixel P 1  may be electrically connected to the corresponding first light-emitting device through the connecting portion, and the second pixel drive circuit  21  in the second sub-pixel P 2  may be electrically connected to the corresponding second light emitting device  22  through the connecting portion. This helps to reduce the difficulty of wiring. 
     Exemplarily, as shown in  FIG. 1 , the plurality of first sub-pixels P 1  comprised in the display substrate  100  are located in the first display area A 1 . Among the plurality of second sub-pixels P 2  comprised in the display substrate  100 , each second light-emitting device  22  is located in the second display area A 2 , the plurality of second sub-pixels P 2  comprise a plurality of second pixel drive circuits  21 , and at least one second pixel drive circuit  21  of the plurality of second pixel drive circuits is not located in the second display area A 2 , such as in the first display area A 1 , such as in the frame area B. 
     For example, only one second pixel drive circuit  21  is located in the frame area B, or the second pixel drive circuit  21  in each second sub-pixel P 2  is located in the frame area B. In the case where the second pixel drive circuits  21  in the plurality of second sub-pixels P 2  are in the frame area B, the plurality of second pixel drive circuits  21  may be on the side of the frame area B close to the second display area A 2 , and arranged in sequence or in an array. 
     Since the second pixel drive circuit  21  is mainly composed of metal lines, the metal lines can form a strong blocking effect on light. By disposing at least one second pixel drive circuit  21  not in the second display area A 2  (such as in the first display area A 1 , such as in the frame area B), the number of the second pixel drive circuit  21  in the second display area A 2  may be reduced. In this way, during the process of external light passes through the portion of the display substrate  100  located in the second display area A 2  and enters the optical device  500  so that the optical device  500  is working, the shielding of the external light may be reduced, the ratio of the light transmitted through the display substrate  100  is increased, and the working performance of the optical device  500  is improved. 
     On this basis, the present disclosure may increase the density of the second light emitting device  22  in the second display area A 2  (for example, it may be the same as the density of the first sub-pixel P 1  in the first display area A 1 ), that is, increase the Pixels Per Inch (PPI for short) of the portion of the display substrate  100  in the second display area A 2 , and is further beneficial to improving the overall display effect of the display substrate  100 . 
     In some embodiments, during the process of the optical device  500  is not working, the part of the display substrate  100  located in the display area A can perform image display; during the process of the optical device  500  is working (for example, the user is taking a selfie), the part of the display substrate  100  located in the second display area A 2  may present a black picture, and the part of the display substrate  100  located in the first display area A 1  may present a picture of the user taking a selfie, which clearly shows the location of the optical device  500 . 
     In some examples, as shown in  FIGS. 1 to 3 , the display substrate  100  may further comprise: an encapsulation layer  3  on the side of the plurality of sub-pixels P away from the substrate  1 . 
     Exemplarily, the orthographic projections of the plurality of first sub-pixels P 1  and the plurality of second sub-pixels P 2  on the substrate  1  are located within the orthographic projection of the encapsulation layer  3  on the substrate  1 , so that the encapsulation layer  3  may be used to the first light-emitting device comprised in the first sub-pixel P 1  and the second light-emitting device  22  comprised in the second sub-pixel P 2  to form a good encapsulation effect, preventing external water vapor and/or oxygen from corroding the first light-emitting device comprised in the first sub-pixel P 1  and the second light-emitting device  22  comprised in the second sub-pixel P 2 , which affects the luminous efficiency and service life. 
     Exemplarily, as shown in  FIGS. 1, 4, and 5 , the above-mentioned encapsulation layer  3  may comprise: a first inorganic layer  31 , an organic layer  32  on the side of the first inorganic layer  31  away from the substrate  1 , and a second inorganic layer  33  on the side of the organic layer  32  away from the substrate  1 . 
     For example, the first inorganic layer  31  may be prepared by using an inorganic insulating material and using a deposition process. The second inorganic material  33  may be prepared by using an inorganic insulating material and using a deposition process. The organic layer  32  may be prepared by using organic insulating materials and using a printing process (for example, printing inkjet). 
     In some examples, as shown in  FIG. 1 ,  FIG. 4 , and  FIG. 5 , the display substrate  100  may further comprise: a retaining wall  12  located in the frame area B. The retaining wall  12  is located between the encapsulation layer  3  and the substrate  1  and comprises a first sub-retaining wall  4 , a second sub-retaining wall  5 , and a transition area  11  between the first sub-retaining wall  4  and the second sub-retaining wall  5 . The first sub-retaining wall  4  and the second sub-retaining wall  5  are used to block the encapsulation layer  3  and the flow of a part of the fluid during the preparation process of the encapsulation layer  3 . 
     Exemplarily, the second sub-retaining wall  5  is located on the side of the first sub-retaining wall  4  away from the display area A. 
     Exemplarily, the first sub-retaining wall  4  is located on the side of the at least one second pixel drive circuit  21  in the frame area B away from the display area A. That is, in the display substrate  100 , the second pixel drive circuit  21 , the first sub-retaining wall  4 , the transition area  11 , and the second sub-retaining wall  5  located in the frame area B are sequentially away from the display area A. 
     Exemplarily, as shown in  FIG. 1 , the first sub-retaining wall  4  and the second sub-retaining wall  5  may be arranged on the edge of the display substrate  100  and arranged in a ring shape. The first sub-retaining wall  4  surrounds the plurality of first sub-pixels P 1  and the plurality of second sub-pixels P 2 , and the second sub-retaining wall  5  surrounds the first sub-retaining wall  4 . 
     In some embodiments, the first inorganic layer  31  may, for example, cover the first sub-retaining wall  4  and the second sub-retaining wall  5  while covering the plurality of first sub-pixels P 1  and the plurality of second sub-pixels P 2 , in order to form a relatively good encapsulation effect. 
     The above-mentioned organic layer  32  may, for example, be located within the range defined by the first sub-retaining wall  4 , that is, the orthographic projection of the organic layer  32  on the substrate  1  is located within the orthographic projection of the first sub-retaining wall  4  on the substrate  1 . This also means that the first sub-retaining wall  4  can block the organic layer  32  in the encapsulation layer  3  and the flow of a part of the fluid during the preparation process of the organic layer  32  to ensure a good encapsulation effect. 
     Exemplarily, the vertical distance between the end of the second sub-retaining wall  5  away from the substrate  1  and the substrate  1  is greater than the vertical distance between the end of the first sub-retaining wall  4  away from the substrate  1  and the substrate  1 , and the vertical distance between the end of the first sub-retaining wall  4  away from the substrate  1  and the substrate  1  is greater than the vertical distance between the end of the transition area  11  away from the substrate  1  and the substrate  1 . 
     Here, due to the process of preparing and forming the organic layer  32 , there will inevitably be certain errors, which may prevent the first sub-retaining wall  4  from forming a good block of the organic layer  32  and the flow of a part of the fluid during the preparation process of the organic layer  32 . In some embodiments of the present disclosure, by setting the vertical distance between the end of the second sub-retaining wall  5  away from the substrate and the substrate  1  to be greater than the vertical distance between the end of the first sub-retaining wall  4  away from the substrate and the substrate  1 , the second sub-retaining wall  5  can be used to further block the organic layer  32  and the flow of a part of the fluid during the preparation process of the organic layer  32 , thereby improving the blocking effect of the organic layer  32  and the flow of a part of the fluid during the preparation process of the organic layer  32 , in turn improving the encapsulation effect of the encapsulation layer  3 . 
     In some embodiments, the above-mentioned second inorganic layer  33  may, for example, cover the organic layer  32  and the first inorganic layer  31 , and while covering the first inorganic layer  31 , it also covers the first sub-retaining wall  4  and the second sub-retaining wall  5 , in order to form a relatively good encapsulation effect. 
     In some embodiments, due to the orthographic projection of the organic layer  32  on the substrate  1  is located within the orthographic projection of the first sub-retaining wall  4  on the substrate  1 , and the first inorganic layer  31  and the second inorganic layer  33  formed an overlay to the first sub-retaining wall  4  and the second sub-retaining wall  5 , therefore, the part of the first inorganic layer  31  and the second inorganic layer  33  that exceeds the organic layer  32  may form a contact. 
     In related art, the frame area of the display substrate will be provided with two sub-retaining walls (there is a gap or step difference between the two sub-retaining walls), and the sub-retaining wall is generally provided in the same layer with an insulating layer in the display area (for example, pixel definition layer). However, in the case of the display substrate is applied to the under-screen camera display device, and at least one second pixel drive circuit  21  electrically connected to the second light-emitting device in the second display area is set be not located in the second display area A 2  (such as in the first display area A 1 , such as in the frame area B), the second light-emitting device and the second pixel drive circuit need to be electrically connected through wires, and an insulating layer between the second light-emitting device and the wires and between the wires and the second pixel drive circuit is required. On the one hand, this will increase the thickness of the portion of the display substrate located in the display area, and it is difficult for the retaining wall located in the frame area to form a good barrier to the organic layer in the encapsulation layer, thereby adversely affecting the encapsulation effect of the encapsulation layer. On the other hand, if the thickness of the sub-retaining wall is increased, the step difference between the transition area  11  and the first sub-retaining wall  4  or the second sub-retaining wall  5  will be too large, which increases the complexity of the patterning process and reduces the product yield. 
     In some embodiments, as shown in  FIGS. 3, 4, and 9 , the retaining wall  12  comprises at least one layer provided in the same layer  42 ,  43 ,  44 , and  45 , and at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  extends continuously across the first sub-retaining wall  4 , the second sub-retaining wall  5  and the transition area  11 . For example, as shown in  FIGS. 3-4 , the display substrate  100  comprises a first flat layer  52 , at least one layer provided in the same layer comprises the first layer provided in the same layer  42 , and the first layer provided in the same layer  42  is provided in the same layer with the first flat layer  52 . The retaining wall  12  comprises at least one layer provided in the same layer  42 ,  43 ,  44 , and  45 , and at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  extends continuously across the first sub-retaining wall  4 , the second sub-retaining wall  5  and the transition area  11 , which may reduce the step difference between the first sub-retaining wall  4  and the transition area  11 , and reduce the step difference between the second sub-retaining wall  5  and the transition area  11 . 
     It should be understood that in the present disclosure, the term “provided in a same layer” refers to being formed by the a same film forming process and a same patterning process, and a layer of the term “provided in a same layer” refers to a layer being formed by the a same film forming process and a same patterning process. Depending on the specific pattern, the same patterning process may comprise multiple exposure, development or etching processes, and the specific patterns in the layer structure formed by the same patterning process may be continuous or discontinuous, and these specific patterns may also be at different heights or of different thicknesses. For example, layer A and layer B being “provided in a same layer” refers to that the layer A and layer B are formed by the same film forming process and the same patterning process. 
     In some embodiments, the display substrate  100  further comprises a second flat layer  53 , a third flat layer  54 , and a fourth flat layer  55  sequentially arranged on the first flat layer  52 , the at least one layer provided in the same layer also comprise a second layer provided in the same layer  43 , a third layer provided in the same layer  44 , and a fourth layer provided in the same layer  45  sequentially arranged on the first layer provided in the same layer  42 . The second layer provided in the same layer  43  is provided in the same layer as the second flat layer  53 , the third layer provided in the same layer  44  is provided in the same layer as the third flat layer  54 , and the fourth layer provided in the same layer  45  is provided in the same layer as the fourth flat layer  55 . 
     By arranging multiple layers provided in the same layer in the first sub-retaining wall  4  and the second sub-retaining wall  5 , the thickness of the first sub-retaining wall  4  and the second sub-retaining wall  5  may be effectively increased, and the vertical distance between the end of the first sub-retaining wall  4  away from the substrate  1  and the substrate  1  may be increased, the vertical distance between the end of the second sub-retaining wall  5  away from the substrate  1  and the substrate  1  may be increased, in turn helps to ensure the blocking and leveling effects of the organic layer  32  in the encapsulation layer  3  and the flow of a part of the fluid during the preparation process of the organic layer  32 , and a good encapsulation effect of the encapsulation layer  3  is ensured. 
     In some embodiments, the display substrate  100  further comprises a fifth flat layer  56  on the fourth flat layer  55 , the second sub-retaining wall  5  further comprises a fifth layer  46  on the fourth layer provided in the same layer  45 , and the fifth layer  46  comprised in the second sub-retaining wall  5  and the fifth flat layer  56  are provided in the same layer, and the orthographic projection of the fifth layer  46  comprised in the second sub-retaining wall  5  on the substrate does not overlap with the orthographic projections of the transition area  11  and the first sub-retaining walls  4  on the substrate  1 . 
     In some embodiments, the display substrate  100  further comprises a pixel defining layer  8  on the fifth flat layer  56 , the second sub-retaining wall  5  further comprises a sixth layer  47  on the fifth layer  46 , the first sub-retaining wall  4  also comprises a fifth layer  48  on the fourth layer provided in the same layer  45 , and a sixth layer  47  comprised in the second sub-retaining wall  5 , a fifth layer  48  comprised in the first sub-retaining wall  4 , and a pixel defining layer  8  are provided in the same layer, and the orthographic projection of the sixth layer  47  comprised in the second sub-retaining wall  5  on the substrate  1  and the orthographic projection of the fifth layer  48  comprised in the first sub-retaining wall  4  on the substrate  1  do not overlap with the orthographic projection of the transition area  11  on the substrate  1 . For example, the step difference between the first sub-retaining wall  4  and the transition area  11  is the thickness of the fifth layer  48  comprised in the first sub-retaining wall  4 , and the step difference between the second sub-retaining wall  5  and the transition area  11  is the sum of the thicknesses of the fifth layer  46  comprised in the second sub-retaining wall  5  and the sixth layer  47  comprised in the second sub-retaining wall  5 . In this way, the thickness of the first sub-retaining wall  4  and the second sub-retaining wall  5  (especially the second sub-retaining wall  5 ) can be further increased, and the step difference between the first sub-retaining wall  4  and the transition area  11  and the step difference between the second sub-retaining wall  5  and the transition area  11  may be reduced. 
     In some embodiments, the multiple layers comprised in the first sub-retaining wall  4  and the multiple layers comprised in the second sub-retaining wall  5  can be arranged in multiple ways, which may be selected and set according to actual needs. In some embodiments, as shown in  FIG. 5 , the retaining wall  12  comprises layer  420 ,  430  provided in the same layer, layer  420 ,  430  provided in the same layer extends continuously across the first sub-retaining wall  4 , the second sub-retaining wall  5  and the transition area  11 . The display substrate  100  further comprises flat layers  71 ,  72 ,  73 , and  74  arranged in sequence. The layer  420  provided in the same layer and the flat layer  71  are provided in the same layer, and the layer  430  provided in the same layer and the flat layer  72  are provided in the same layer. The second sub-retaining wall  5  also comprises a layer  440  on the layer  430  provided in the same layer and a layer  470  on the layer  440 . The first sub-retaining wall also comprises a layer  480  on the layer  430  provided in the same layer, and layer  440  comprised in the second sub-retaining wall  5  and the flat layer  73  are provided in the same layer, and the layer  470  comprised in the second sub-retaining wall  5 , the layer  480  comprised in the first sub-retaining wall, and the pixel defining layer  8  are provided in the same layer. The orthographic projection of the layer  470  comprised in the second sub-retaining wall  5  on the substrate  1  and the orthographic projection of the layer  480  comprised in the first sub-retaining wall  4  on the substrate  1  do not overlap with the orthographic projection of the transition area  11  on the substrate  1 . For example, the step difference between the first sub-retaining wall  4  and transition area  11  is the thickness of the layer  480  comprised in the first sub-retaining wall  4 , and the step difference between the second sub-retaining wall  5  and transition area  11  is the sum of the thicknesses of the layer  440  and layer  470  comprised in the second sub-retaining wall  5 . 
     In the case of increasing the vertical distance between the end of the first sub-retaining wall  4  away from the substrate and the substrate  1  and the vertical distance between the end of the second sub-retaining wall  5  away from the substrate and the substrate  1 , the sizes of the step difference between the first sub-retaining wall  4  and the transition area  11  and the step difference between the second sub-retaining wall  5  and the transition area  11  in the direction perpendicular to the substrate  1  will also increase. The retaining wall  12  comprises at least one layer provided in the same layer  42 ,  43 ,  44 , and  45 , and at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  extends continuously across the first sub-retaining wall  4 , the second sub-retaining wall  5  and the transition area  11 , which may reduce the step difference between the first sub-retaining wall  4  and the transition area  11 , and reduce the step difference between the second sub-retaining wall  5  and the transition area  11 . 
       FIG. 10  schematically shows a top view of the plane shown in  FIG. 7 . In some examples, as shown in  FIGS. 9-10 , a plurality of signal transmission lines  400  cross the first sub-retaining wall  4 , the transition area  11  and the second sub-retaining wall  5  and enter the display area A from the frame area B. The signal transmission line  400  in the display device  1000  is prepared by a photolithography process. In the process of forming the signal transmission line  400  on the light-emitting side of the display substrate  100  (that is, the side of the encapsulation layer  3  away from the substrate  1 ), a deposition process may be used to form a conductive material film, and the side of the conductive material film away from the substrate  1  is coated with photoresist, and then the photoresist is exposed and developed, and the conductive material film is patterned to obtain the signal transmission line  400 . Since the signal transmission line  400  needs to pass through the frame area B to realize the electrical connection between the touch structure  200  and the touch driving chip  300 , the orthographic projection of the signal transmission line  400  on the substrate  1  will at least partially overlaps with the orthographic projection of the transition area  11  between the first sub-retaining wall  4  and the second sub-retaining wall  5  on the substrate  1 . 
     The present invention reduces the step difference between the first sub-retaining wall  4  and the transition area  11  and the step difference between the second sub retaining wall  5  and the transition area  11 , in the process of preparing and forming the signal transmission line  400  by photolithography, the thickness of the photoresist in the transition area  11  may be reduced, so that in the process of exposing and developing the photoresist, the photoresist remaining in the transition area  11  may be avoided, and in turn in the process of patterning the conductive material film, the formation of conductive material residues can be avoided, the signal transmission line  400  can be prevented from being short-circuited, and the yield of the display device  1000  may be improved. 
     In the display substrate  100  provided by some embodiments of the present disclosure, after setting at least one second pixel drive circuit  21  in the plurality of second sub-pixels P 2  to be not located in the second display area A 2  (such as in the first display area A 1 , such as in the frame area B), the first sub-retaining wall  4  and the second sub-retaining wall  5  comprising at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  may be arranged in the frame area B to realize the blocking effect of the encapsulation layer  3  and the flow of a part of the fluid during the preparation process of the encapsulation layer  3  to ensure the encapsulation effect of the encapsulation layer  3 . 
     In addition, with the retaining wall  12  comprising at least one layer provided in the same layer  42 ,  43 ,  44 , and  45 , and at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  extending continuously across the first sub-retaining wall  4 , the second sub-retaining wall  5  and the transition area  11 , so that the orthographic projection of the transition area  11  between the first sub-retaining wall  4  and the second sub-retaining wall  5  on the substrate  1  overlaps with the orthographic projection of at least one layer provided in the same layer  42 ,  43 ,  44 , and  45  on the substrate  1 , the step difference between the first sub-retaining wall  4  and the transition area  11  can be efficiently reduced, and the step difference between the second sub-retaining wall  5  and the transition area  11  can be reduced. In this way, when the display substrate  100  is applied to the display device  1000 , the remaining conductive material of the signal transmission line  400  may be effectively avoided, thereby avoiding the short circuit of the signal transmission line  400 , and improving the yield of the display device  1000 . 
     In some embodiments, as shown in  FIG. 2 , the display substrate  100  further comprises at least one conduction layer  6 . The second pixel drive circuit  21  located in the frame area is electrically connected to the corresponding second light emitting device  22  through the at least one conduction layer  6 , and the display substrate  100  further comprises: flat layers  510 ,  512  between the at least one conduction layer  6  and the second pixel drive circuit  21 ; and a flat layer  514  between the at least one conduction layer  6  and the second light emitting device  22 . That is, the first end of the at least one conduction layer  6  may extend into the frame area B to be electrically connected to the second pixel drive circuit  21  (for example, electrically connected to the second pixel drive circuit  21  through the connecting portion  610 ), the second end may extend into the second display area A 2  to be electrically connected to the corresponding second light-emitting device  22 . In this way, an insulating layer is provided between the second pixel drive circuit  21  and the at least one conduction layer  6 , and an insulating layer is provided between the at least one conduction layer  6  and the second light emitting device  22 , and the flatness and continuity of the conduction layer  6  may be ensured at the same time, so that the second pixel drive circuit  21  located in the frame area B may provide a driving voltage to the corresponding second light-emitting device  22  through the at least one conduction layer  6 , thereby controlling the light-emitting state of the corresponding second light-emitting device  22 . 
     In some embodiments, as shown in  FIG. 3 , the second pixel drive circuit  21  located in the frame area is electrically connected to the corresponding second light emitting device  22  through at least one conduction layer  6  (and an optional connecting portion  520 ), at least one conduction layer  6  may comprise a plurality of conduction layers, and the display substrate  100  may further comprise a flat layer between two adjacent conduction layers among the plurality of conduction layers. Exemplarily, the at least one conduction layer  6  comprises a first conduction layer  61 , a second conduction layer  62 , and a third conduction layer  63 , and the display substrate  100  comprises a first flat layer  52 , a second flat layer  53 , the third flat layer  54 , the fourth flat layer  55  and the fifth flat layer  56  sequentially arranged on the substrate  1 ; the second pixel drive circuit  21  is between the substrate  1  and the first flat layer  52 ; the first conduction layer  61  is between the second flat layer  53  and the third flat layer  54 ; the second conduction layer  62  is between the third flat layer  54  and the fourth flat layer  55 ; the third conduction layer  63  is between the fourth flat layer  55  and the fifth flat layer  56 ; and the second light emitting device  22  is on the side of the fifth flat layer  56  away from the substrate  1 . 
     Exemplarily, the number of conduction layers in the at least one conduction layer  6  may be equal to the number of the second pixel drive circuits  21  located in the frame area B. 
     For example, the at least one conduction layer  6  may be formed of a conductive material with a relatively high light transmittance, that is, the at least one conduction layer  6  may be light-transmissive. Exemplarily, the material of the conduction layer  6  may comprise Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Gallium Zinc Oxide (IGZO), etc. By using at least one conduction layer  6  to connect the second pixel drive circuit  21  in the frame area B and the second light emitting device  22  in the display A, it helps to further improve the light transmittance of the portion of the display substrate  100  located in the second display area A 2 , and improve the working performance of the optical device  500 . 
     In some embodiments, the number of flat layers may be selected according to the arrangement of at least one conduction layer  6 . For example, in  FIG. 2 , only two flat layers may be provided between the at least one conduction layer  6  and the second pixel drive circuit  21 , and only one flat layer may be provided between the at least one conduction layer  6  and the second light emitting device  22 , the display substrate  100  may comprise three flat layers stacked in sequence. For example, as shown in  FIG. 3 , at least one conduction layer  6  may comprise a first conduction layer  61 , a second conduction layer  62 , and a third conduction layer  63 . In this case, the display substrate  100  may comprise five flat layers stacked in sequence. 
     In some embodiments, in the case where at least one conduction layer  6  may comprise a first conduction layer  61 , a second conduction layer  62 , and a third conduction layer  63 , one of the first conduction layer  61 , the second conduction layer  62  and the third conduction layer  63  may be electrically connected to the second light emitting device  22  capable of emitting red light, and the other layer of the first conduction layer  61 , the second conduction layer  62  and the third conduction layer  63  may be electrically connected to the second light emitting device  22  capable of emitting green light, and the remaining layer of the first conduction layer  61 , the second conduction layer  62 , and the third conduction layer  63  may be electrically connected to the second light emitting device  22  capable of emitting blue light. 
     In some examples, the pixel defining layer  8  has a plurality of openings. At least a part of a second light emitting device  22  is provided in each opening. By providing the pixel defining layer  8 , the light-emitting regions of each of the first sub-pixel P 1  and the second sub-pixel P 2  can be defined. 
     Exemplarily, as shown in  FIGS. 3-4 , when the display substrate  100  comprises five layers of flat layers  52 ,  53 ,  54 ,  55 , and  56  stacked in sequence, the first sub-retaining wall  4  may comprise, for example, five layers  42 ,  43 ,  44 ,  45 ,  48 , the second sub-retaining wall  5  may comprise, for example, six layers  42 ,  43 ,  44 ,  45 ,  46 ,  47 . 
     In some examples, as shown in  FIG. 4 , the fifth layer  46  comprised in the second sub-retaining wall  5  is overlapped on the fourth layer provided in the same layer  45 . Exemplarily, as shown in  FIG. 4 , the sixth layer  47  comprised in the second sub-retaining wall  5  is overlapped on the fifth layer  46  comprised in the second sub-retaining wall  5  and covers at least a part of the fifth layer  46  comprised in the second sub-retaining wall  5 . In some examples, as shown in  FIG. 4 , the fifth layer  48  comprised in the first sub-retaining wall  4  is overlapped on the fourth layer provided in the same layer  45 . 
     For example, the fifth layer  46  comprised in the second sub-retaining wall  5  extends for about 5 μm above the fourth layer provided in the same layer  45 . In the case where the sixth layer  47  comprised in the second sub-retaining wall  5  covers all of the fifth layer  46  comprised in the second sub-retaining wall  5 , the sixth layer  47  comprised in the second sub-retaining wall  5  extends above the fifth layer  46  comprised in the second sub-retaining wall  5  by about 5 μm, for example. This helps to reduce the slope angle. 
     In some embodiments, as shown in  FIG. 5 , the display substrate  100  further comprises a barrier layer  9 . In some examples, as shown in  FIG. 5 , the first end of the barrier layer  9  extends into the first sub-retaining wall  4 , and the second end of the barrier layer  9  extends between the two flat layers  72 ,  73  comprised in the display substrate. 
     For example, as shown in  FIGS. 3-4 , the first end  910  of the barrier layer  9  may be between the second layer provided in the same layer  43  and the third layer provided in the same layer  44 . The second end  920  of the barrier layer  9  may be between the second flat layer  53  and the third flat layer  54 . 
     For example, as shown in  FIGS. 3-4 , the first end  910  of the barrier layer  9  may be between the third layer provided in the same layer  44  and the fourth layer provided in the same layer  45 . The second end  920  of the barrier layer  9  may be between the third flat layer  54  and the fourth flat layer  55 . 
     For example, as shown in  FIGS. 3-4 , the first end  910  of the barrier layer  9  may be between the fourth layer provided in the same layer  45  and the fifth layer  48  comprised in the first sub-retaining wall  4 . The second end  920  of the barrier layer  9  may be between the fourth flat layer  55  and the fifth flat layer  56 . 
     It should be understood that the number of barrier layers  9  can be set according to actual needs. 
     In some embodiments, during the process of preparing and forming the display substrate  100 , the thin films are sequentially formed in a sequence. Among them, the thin film formed earlier is close to the substrate  1 , and the thin film formed later is far away from the substrate  1 . That is, the barrier layer  9  is formed later than the layer that is in contact with the barrier layer  9  and below the barrier layer  9 . 
     By providing the barrier layer  9 , the barrier layer  9  can be used to reduce the step differences between the first sub-retaining wall  4  and the multiple flat layers, reducing the rate of change of the step differences. The barrier layer  9  can also be used to block the retaining wall and multiple flat layers to avoid contact between the two which forms a water-oxygen channel, thereby preventing water vapor from entering the display area A, which is beneficial to improve the ability to block water vapor, and avoid encapsulating failure due to water vapor entering the display area A. 
     In some examples, as shown in  FIG. 3 , the barrier layer  9  is provided in the same layer as one of the first conduction layer  61 , the second conduction layer  62 , and the third conduction layer  63 , and the barrier layer  9  is not electrically connected to the first conduction layer  61 , the second conduction layer  62  or the third conduction layer  63 . In this way, it is beneficial to simplify the preparation method of the display substrate  100  and avoid short circuits. 
     In some examples, as shown in  FIG. 5 , the orthographic projection of the flat layer  73  on the second end  920  of the barrier layer  9  on the substrate  1  is tangent or overlapped with the orthographic projection of layer  430  provided in the same layer disposed under the first end  910  of the barrier layer  9  on the substrate  1 . In this way, the transitional step difference of the film comprised in the display substrate  100  from the frame area B to the display area A can be made smaller, and the yield of the signal transmission line  400  to be formed subsequently can be ensured. 
     The purpose of the embodiments of the present disclosure is to provide a display substrate and a display device, which are used to improve the encapsulation effect and blocking effect of the display substrate. At the same time, the short circuit or other failures of the signal transmission line due to the residual conductive material in the display device using the display substrate are avoided, and the yield of the display device is improved. 
     Some embodiments of the present disclosure provide a display device  1000 , which comprises the display substrate  100  as described in any of the foregoing embodiments. 
     The beneficial effects that can be achieved by the above-mentioned display device  1000  are the same as the beneficial effects that can be achieved by the display substrate  100 , and will not be repeated here. 
     The touch structure  200  comprised in the display device  1000  comprises a variety of structures, which may be selected and set according to actual needs. 
     In some examples, as shown in  FIG. 7 , the touch structure  200  may comprise a plurality of conductive bridges arranged in an array, and a plurality of rows of first touch sub-electrodes. Each row of the first touch sub-electrodes comprises a plurality of first touch sub-electrodes arranged at intervals along the first direction X. As shown in  FIG. 8 , in each row of first touch sub-electrodes, every two adjacent first touch sub-electrodes are electrically connected to a conductive bridge through via holes, so that the multiple rows of first touch sub-electrodes and the plurality of conductive bridges constitute a plurality of first touch electrodes. 
     The touch structure  200  may further comprise a plurality of second touch electrodes extending along the second direction Y. Each second touch electrode comprises a plurality of second touch sub-electrodes connected in series. Exemplarily, each second touch electrode is an integral structure. 
     Each first touch electrode is electrically connected to the touch driving chip  500  through a signal transmission line  400 , and each second touch electrode is electrically connected to the touch driving chip  500  through a signal transmission line  400 . 
     Exemplarily, the signal transmission line  400  comprised in the display device  1000  may be provided in the same layer as the above-mentioned conductive bridge. This is beneficial to simplify the manufacturing process of the display device  1000 . 
     In some embodiments, the above-mentioned display device  1000  may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and the like. 
     The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any variation or replacement contemplated by those skilled in the art within the technical scope of this disclosure should be covered within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure shall be subject to the scope of protection of the claims.