Patent Publication Number: US-2022231109-A1

Title: Displaying substrate and displaying device

Description:
CROSS REFERENCE TO RELEVANT DISCLOSURES 
     The present application claims the priority of the Chinese patent application filed on Jan. 15, 2021 before the Chinese Patent Office with the application number of 202110057134.7 and the title of “DISPLAYING SUBSTRATE AND DISPLAYING DEVICE”, which is incorporated herein in its entirety by reference. 
     TECHNICAL FIELD 
     The disclosure relates to the technical field of display, in particular to a displaying substrate and a displaying device. 
     BACKGROUND 
     For the technology of LEI) (Light Emitting Diode) display driven by thin-film transistors, since a drive current required for LED display is highly sensitive, a voltage drop of an auxiliary electrode has a great influence on the drive current. Therefore, a relatively large-area VDD auxiliary electrode and a relatively large-area VSS auxiliary electrode need to be manufactured in an LED displaying substrate to reduce resistance and pressure drop of trace. 
     SUMMARY 
     The disclosure provides a displaying substrate and a displaying device. 
     The disclosure discloses a displaying substrate, which comprises: 
     a flexible base plate; 
     a first metal layer arranged on one side of the flexible base plate and comprising a first auxiliary electrode, wherein the first auxiliary electrode is connected with a first power cord; 
     a pixel unit arranged on a side of the flexible base plate away from the first metal layer and comprising a plurality of thin-film transistors arranged on the side of the flexible base plate away from the first metal layer, and an insulation layer and a second auxiliary electrode arranged in layer configuration on a side of the plurality of thin-film transistors away from the flexible base plate, wherein the insulation layer is arranged close to the flexible base plate, and the second auxiliary electrode is connected with a second power cord; 
     wherein, the plurality of thin-film transistors comprise a drive transistor, a source of the drive transistor is connected with the first auxiliary electrode, a drain of the drive transistor is connected with a first electrode of a light emitting device, and a second electrode of the light emitting device is connected with the second auxiliary electrode. 
     Optionally, the displaying substrate further comprising: 
     a second metal layer; 
     and a flat layer; 
     wherein the second metal layer and the flat layer are arranged in layer configuration between the flexible base plate and the pixel unit, the second metal layer is arranged close to the flexible base plate, the second metal layer comprises a jumper electrode, the jumper electrode is connected with the first auxiliary electrode through a via hole formed in the flexible base plate, and the jumper electrode is further connected with the source of the drive transistor. 
     Optionally, an orthographic projection of the first auxiliary electrode on the flexible base plate covers an orthographic projection of the jumper electrode on the flexible base plate, 
     Optionally, an orthographic projection area of the first auxiliary electrode on the flexible base plate is equal to an orthographic projection area of the jumper electrode on the flexible base plate. 
     Optionally, a thickness of the flat layer is greater than or equal to 2 μm and less than or equal to 3 μm. 
     Optionally, the first metal layer further comprises a bonding electrode, the second metal layer further comprises a signal lead wire, and the signal lead wire is connected with the bonding electrode through a via hole formed in the flexible base plate. 
     Optionally, the drive transistor comprises a barrier layer, a light shielding layer, a huller layer, an active layer, a grid insulating layer, a grid electrode, an interlayer dielectric layer and a source-drain electrode that are arranged in layer configuration on one side of the flat layer away from the flexible base plate; 
     Optionally, wherein the barrier layer is arranged close to the flexible base plate, the insulating layer is arranged on a side of a source-drain electrode away from the flexible base plate, the source-drain electrode comprises the source and the drain of the drive transistor, and the source of the drive transistor is connected with the jumper electrode though via holes formed in the interlayer dielectric layer, the grid insulating layer, the buffer layer, the barrier layer and the flat layer. 
     Optionally, an orthographic projection of the light shielding layer on the flexible base plate covers an orthographic projection of the active layer on the flexible base plate. 
     Optionally, a drive circuit of the pixel unit may comprise a plurality of thin-film transistors, wherein the thin-film transistors comprise at least one of the followings: switching transistor, compensating transistor, resetting transistor or drive transistor. 
     Optionally, the plurality of thin-film transistors further comprise a functional transistor, and the orthographic projection of the first auxiliary electrode on the flexible base plate covers an orthographic projection of the functional transistor on the flexible base plate, 
     Optionally, the orthographic projection of the first auxiliary electrode on the flexible base plate is overlapped with the orthographic projection of the second auxiliary electrode on the flexible base plate. 
     Optionally, the first auxiliary electrode is configured to transmit VDD signals, the second auxiliary electrode is configured to transmit VSS signals; or the first auxiliary electrode is configured to transmit VSS signals, and the second auxiliary electrode is configured to transmit VDD signals. 
     Optionally, the light emitting device comprises at least one of the followings: LED, Mini LED, Micro LED or OLED. 
     The disclosure discloses a displaying device, comprising the displaying substrate according to any one of the embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the disclosure more clearly, the drawings required for describing the embodiments of the disclosure will be simply introduced below. Obviously, the drawings depicted below only illustrate some embodiments of the disclosure. Other drawings may further be obtained by a person of ordinary skill in the art according to these drawings without creative work. 
         FIG. 1  illustrates a sectional structural diagram of a displaying substrate in related art; 
         FIG. 2  illustrates a sectional structural diagram of a displaying substrate according to the embodiments of the disclosure; 
         FIG. 3  illustrates a planar structural diagram of a first auxiliary electrode according to the embodiments of the disclosure; 
         FIG. 4  illustrates a planar structural diagram of a second auxiliary electrode according to the embodiments of the disclosure; 
         FIG. 5  illustrates a planar structural diagram of a displaying substrate according to the embodiments of the disclosure; 
         FIG. 6  illustrates a sectional structural diagram of another displaying substrate according to the embodiments of the disclosure; and 
         FIG. 7  illustrates a flowchart of a manufacturing method of a displaying substrate according to the embodiments of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     To make the above purposes, features and advantages of the disclosure clearer and easily understood, the disclosure will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. 
     In the related art, a large-area VDD auxiliary electrode and a large-area VSS auxiliary electrode are usually manufactured to reduce influences of a voltage drop of signals on LED current. The VDD auxiliary electrode is connected with VDD signal trace, and the VSS auxiliary electrode is connected with VSS signal trace. As shown in  FIG. 1 , only a relatively thin insulating layer (PLN 2 /PVX 2 ) is arranged between the large-area VDD auxiliary electrode and the large-area VSS auxiliary electrode, so a short circuit may happen between the VDD auxiliary electrode and the VSS auxiliary electrode, thereby resulting in a failure to light up an entire panel and affecting the product yield and reliability. 
     To solve the above-mentioned problems, an embodiment of the disclosure provides a displaying substrate. Referring  FIG. 2 , which illustrates a sectional structural diagram of a displaying substrate according to this embodiment, the displaying substrate comprises a flexible base plate  21 ; a first metal layer  22  arranged on one side of the flexible base plate  21 , wherein the first metal layer  22  comprises a first auxiliary electrode  221 , and the first auxiliary electrode  221  is connected with a first power cord, as shown in  FIG. 3 ; at least one pixel unit arranged on a side of the flexible base plate  21  away from the first metal layer  22 , wherein the at least one pixel unit comprises a plurality of thin-film transistors ( FIG. 2  schematically illustrates two thin-film transistors  25  and  29 ) arranged on the side of the flexible base plate  21  away from the first metal layer  22 , and an insulating layer  23  and a second auxiliary electrode  24  arranged in layer configuration on a side of the plurality of thin-film transistors away from the flexible base plate  21 , the insulating layer  23  is arranged close to the flexible base plate  21 , and the second auxiliary electrode  24  is connected with a second power cord, as shown in  FIG. 4 . 
     Referring to  FIG. 2 , the plurality of thin-film transistors comprise a drive transistor  25 . The drive transistor  25  is configured to drive a light emitting device  26  to emit light. A source S 1  of the drive transistor  25  is connected with the first auxiliary electrode  221 , and a drain Di of the drive transistor  25  is connected with a first electrode  261  of the light emitting device  26 . A second electrode  262  of the light emitting device  26  is connected with the second auxiliary electrode  24 . 
     According to this embodiment, the first power cord may be made of the same material and arranged on the same layer as the first auxiliary electrode  221 . Referring to  FIG. 3  which illustrates a planar structural diagram of the distribution of the first auxiliary electrode, the first metal layer  22  may comprise a plurality of first auxiliary electrodes  221 . Each of the first auxiliary electrodes  221  is connected to the first power cord, and all of the first auxiliary electrodes  221  communicate with one another through the first power cord to ensure the uniformity of voltage. 
     The corresponding relationship between each of the first auxiliary electrodes  221  and the pixel unit may be diversified. For example, one pixel unit may be correspondingly provided with one first auxiliary electrode  221  (as shown in  FIG. 3 ), or a plurality of pixel units share one first auxiliary electrode  221 , etc. In actual disclosure, when a plurality of pixel units share one first auxiliary electrode  221 , the sources of the drive transistors of the plurality of pixel units may be interconnected to ensure the uniformity of the operating voltage and reduce the number of holes. 
     It should be noted that, the shape of the first auxiliary electrode  221  is not limited to the rectangular shape as shown in  FIG. 3 . The shape of the first auxiliary electrode  221  may be designed upon actual demands, for example, a regular polygon, a round, or other irregular shape, solid or hollowed shape, etc. The specific shape of the first auxiliary electrode  221  is not limited. in this embodiment. 
     According to this embodiment, the second power cord may be made of the same material and arranged on the same layer as the second auxiliary electrode  24 . Referring to  FIG. 4  which illustrates a planar structural diagram of the distribution of the second auxiliary electrode, each of the pixel units may be correspondingly provided with one second auxiliary electrode  24 , and each of the second auxiliary electrodes  24  is connected to the second power cord. All of the second auxiliary electrodes  24  communicate with one another through the second power cord to ensure the uniformity of voltage. 
     According to this embodiment, the orthographic projection of the first auxiliary electrode  221  on the flexible base plate  21  may be overlapped with the orthographic projection of the second auxiliary electrode  24  on the flexible base plate  21 . Refer to  FIG. 5  which illustrates a planar structural diagram of a displaying substrate. By adopting the displaying substrate according to this embodiment, since the distance between the first auxiliary electrode  2 . 2 . 1  and the second auxiliary electrode  24  is increased, the risk of a short circuit between the first auxiliary electrode  221  and the second auxiliary electrode  24  may be lowered, even if the orthographic projections of the first auxiliary electrode  221  and the second auxiliary electrode  24  on the flexible base plate  21  are overlapped. 
     The connection between the source S 1  of the drive transistor  25  and the first auxiliary electrode  221  may be implemented by a plurality of methods, for example, the source SI of the drive transistor  25  and the first auxiliary electrode  221  may be connected through a via hole formed in a film layer (including the flexible base plate  21 ) there-between. In actual disclosure, the method of connection between the source S 1  of the drive transistor  25  and the first auxiliary electrode  221  may be determined upon the actual structure of the drive transistor  25 . The drive transistor  25  may be of a top grid structure, a bottom grid structure, a dual grid structure, etc. The specific structure of the drive transistor  25  is not limited in this embodiment. The embodiments below will give detailed description in conjunction with the specific structure of the drive transistor  25 . 
     The connection between the drain D 1  of the drive transistor  25  and the first electrode  261  of the light emitting device  26  may be implemented by a plurality of methods. For example, the first electrode  261  of the light emitting device  26  and the drain D 1  of the drive transistor  25  may be connected though a via hole formed in the insulating layer  23  when the first electrode  261  of the light emitting device  26  and the second auxiliary electrode  24  are arranged on the same layer. 
     The connection between the second electrode  262  of the light emitting device  26  and the second auxiliary electrode  24  may be implemented by a plurality of methods. For example, the second electrode  262  of the light emitting device  26  and the second auxiliary electrode  24  may be in a direct contact connection when the second electrode  262  of the light emitting device  26  and the second auxiliary electrode  24  are located on the same layer. 
     To reduce a voltage drop, the first metal layer  22  and the second auxiliary electrode  24  may be made of metallic materials with relatively low resistivity, for example, aluminum or aluminum alloys, copper or copper alloys, etc. 
     For the displaying substrate according to this embodiment, the distance between the first auxiliary electrode and the second auxiliary electrode is increased by arranging the first auxiliary electrode and the second auxiliary electrode on two sides of the flexible base plate, the thin-film transistors and the insulating layer, thereby lowering the risk of a short circuit between the first auxiliary electrode and the second auxiliary electrode and enhancing the product yield and reliability. 
     In addition,  FIG. 1  illustrates a displaying substrate in the related art. Above the thin-film transistors, an insulating layer PLN/PVX located between the thin-film transistor and a metal layer VDD, the metal layer VDD, an insulating layer PLN 2 /PVX 2  located between the metal layer VDD and a metal layer VSS, and the metal layer VSS need to be arranged, that is, two metal layers and two insulating layers need to be arranged above the thin-film transistors. The manufacturing process is complicated and costs a lot of time. According to this embodiment, the displaying substrate may achieve the functions the same as those in  FIG. 1  by arranging the first auxiliary electrode  221  on a side of the flexible base plate  21  away from the second auxiliary electrode  24 , as shown in  FIG. 2 , and arranging one insulating layer  23  and one metal layer (the second auxiliary electrode  24 ) above the thin-film transistors. 
     Therefore, comparing with the related art, by arranging the first auxiliary electrode on the side of the flexible base plate away from the second auxiliary electrode, the manufacturing process of at least one insulating layer may be reduced, the process flow is simplified, the product yield is enhanced, and costs are reduced. When the first auxiliary electrode and a bonding electrode on the back of the displaying substrate are formed on the same layer (which will be described in details in the embodiments below), the manufacturing process of one metal layer may be reduced, the process flow is simplified, the product yield is enhanced, and costs are to reduced. 
     According to an optional implementation, the first power cord may be a VDD (high-potential operating voltage) signal wire, and the second power cord may be a VSS (low-potential public voltage&#39;) signal wire. According to this implementation, the first auxiliary electrode  221  is configured to transmit VDD signals, and the second auxiliary electrode  24  is configured to transmit VSS signals. The first electrode  261  of the light emitting device  26  is an anode, and the second electrode  262  of the light emitting device  26  is a cathode. 
     According to an optional implementation, the first power cord may be a VSS (low-potential public voltage) signal wire, and the second power cord may be a VDD (high-potential operating voltage) signal wire. According to another implementation, the first auxiliary electrode  221  is configured to transmit VSS signals, and the second auxiliary electrode  24  is configured to transmit VDD signals. The first electrode  261  of the light emitting device  26  is a cathode, and the second electrode  262  of the light emitting device  26  is an anode. 
     According to this embodiment, the light emitting device  26  may be an LED, a Mini LED, a Micro LED, or an OLED. 
     According to an optional implementation, referring to  FIG. 2 , a second metal layer  27  and a flat layer  28  are arranged in layer configuration between the flexible base plate  21  and the pixel unit, wherein the second metal layer  27  is arranged close to the flexible base plate  21 , the second metal layer  27  comprises a jumper electrode  271 , the jumper electrode  271  is connected. with the first auxiliary electrode  221  through a via hole formed in the flexible base plate  21 , and the jumper electrode  271  is further connected with the source S 1  of the drive transistor  25 . 
     According to this implementation, the jumper electrode  271  is connected with the first auxiliary electrode  221  and the source S 1  of the drive transistor  25 , so that contact resistance is lowered, a voltage drop is reduced, the hole depth is reduced, and the process difficulty is lowered. 
     To further reduce the voltage drop, the second metal layer  27  may be made of metallic materials with relatively low resistivity, for example, aluminum or aluminum alloys, copper or copper alloys etc. 
     Wherein, the orthographic projection of the first auxiliary electrode  221  on the flexible base plate  21  may cover the orthographic projection of the jumper electrode  271  on the flexible base plate  21 . That is, the orthographic projection of the juniper electrode  271  on the flexible base plate  21  falls within the orthographic projection of the first auxiliary electrode  221  on the flexible base plate  21 . 
     To further reduce the voltage drop, as shown in  FIG. 6 , the orthographic projection area to of the first auxiliary electrode  221  on the flexible base plate  21  may be equal to the orthographic projection area of the jumper electrode  271  on the flexible base plate  21 . In this way, by increasing the area of the jumper electrode  271 , signals transmitted by the first auxiliary electrode  221  are jointly transmitted by two metal layers, namely the jumper electrode  271  and the first auxiliary electrode  221 , thereby lowering the resistance on the signal transmission path and reducing the voltage drop of signals. 
     Wherein, the orthographic projection of the first auxiliary electrode  221  on the flexible base plate  21  may be partly or completely overlapped (as shown in  FIG. 6 ) with the orthographic projection of the jumper electrode  271  on the flexible base plate  21 . The overlapping pattern is not limited in this embodiment. 
     When the orthographic projection area of the first auxiliary electrode  221  on the flexible base plate  21  is equal to the orthographic projection area of the jumper electrode  271  on the flexible base plate  21 , the thickness of the flat layer  28  may be greater than or equal to  2  um and less than or equal to 3 μm so as to avoid parasitic capacitance or electrode coupling occurring between the jumper electrode  271  and the metal layer in the thin-film transistor. The distance between the jumper electrode  271  and each of the metal layers in the thin-film transistor is prolonged by increasing the thickness of the flat layer  28 , thereby avoiding the influence of parasitic capacitance or electrode coupling. 
     According to an optional implementation, referring to  FIG. 2 , the drive transistor  25  may comprise: a barrier layer  251 , a light shielding layer  252 , a buffer layer  253 , an active layer  254 , a grid insulating layer  255 , a grid electrode  256 , an interlayer dielectric layer  257  and a source-drain electrode  258  that are arranged in layer configuration on a side of the flat layer  28  away from the flexible base plate  21 , wherein the barrier layer  251  is arranged close to the flexible base plate  21 , the insulating layer  23  is arranged on one side of the source-drain electrode  258  away from the flexible base plate  21 , the source-drain electrode  258  comprises the source S 1  and the drain Di of the drive transistor  25 , and the source S 1  of the drive transistor  25  may be connected with the juniper electrode  271  through via holes formed in the interlayer dielectric layer  257 , the grid insulating layer  255 , the buffer layer  253 , the barrier layer  251  and the flat layer  28 . 
     Specifically, referring to  FIG. 2 , the source S 1  of the drive transistor  25  may be connected to a metal grid layer  210  through a via hole in the interlayer dielectric layer  257 ; the metal grid layer  210  is connected to a metal light shielding layer  211  through via holes in the grid insulating layer  255  and the buffer layer  253 ; and the metal light shielding layer  211  is connected to the jumper electrode  271  through via holes on the barrier layer  251  and the flat layer  28 . Such method for connection between the source S 1  of the drive transistor  25  and the to juniper electrode  271  may lower the contact resistance and reduce the voltage drop, and additionally, may also reduce hole depth and lower the process difficulty. 
     Wherein, the metal grid layer  210  may be made of the same material as the grid electrode  256  and formed synchronously to the grid electrode, and the metal light shielding layer  211  may be made of the same material as the light shielding layer  252  and formed synchronously to the light shielding layer. 
     To protect the active layer  254  of the drive transistor  25  against influences from light rays, the orthographic projection of the light shielding layer  252  on the flexible base plate  21  may cover the orthographic projection of the active layer  254  of the drive transistor  25  on the flexible base plate  21 . In this way, the light shielding layer  252  may protect the drive transistor  25  against influences from light rays, further improving the reliability of the product. 
     It should be noted that, the barrier layer  251 , the light shielding layer  252  and the buffer layer  253  in the drive transistor  25  are not necessary, and one or more of three layers may be selectively arranged upon actual demands. 
     To protect the active layers of other thin-film transistors against influences from light rays, according to an optional implementation, referring to  FIG. 2 , the plurality of thin-film transistors may further comprise a functional transistor  29 , and the orthographic projection of the light shielding layer  221  on a flexible base plate  21  may cover the orthographic projection of the active layer  291  of the functional transistor  29  on the flexible base plate  21 . In this way, the first auxiliary electrode  221  may protect the functional transistor  29  against influences from light rays, further improving the reliability of the product. 
     Wherein, a drive circuit of the pixel unit may comprise a plurality of thin-film transistors, for example at least one of a switching transistor, a compensating transistor, a resetting transistor, a drive transistor, etc. 
     According to this embodiment, the functional transistor  29  may comprise one or several of the thin-film transistors of the drive circuit, that is, the functional transistor  29  may comprise one or several of the switching transistor, the compensating transistor, the resetting transistor, the drive transistor, etc. 
     During specific implementation, the inventor of the disclosure also found that AMLED (Active Matrix Light Emitting Diode) bonding technologies are classified in types: a lateral bending connection technology and a flexible backplane drilling technology. Wherein, the lateral bending connection technology refers to a process of manufacturing thin-film transistors on the front of glass, manufacturing electrode trace and the bonding electrode on the hack of glass, and finally performing lateral bonding of the thin-film transistors and the electrode trace. Such process generates influences on the front when the back is manufactured, and lateral bonding needs to be carried out after glass cutting, so the process is relatively difficult. 
       100701  Therefore, to further reduce the process difficulty, according to an optional implementation, referring to  FIG. 2 , the first metal layer  22  may further comprise the bonding electrode  222 , the second metal layer  27  may further comprise a signal lead wire  272 , and the signal lead wire  272  is connected with the bonding electrode  222  through a via hole formed in the flexible base plate  21 . 
     Wherein, the signal lead wire  272  may be a lead wire for data signals, grid signals, VDD signals or VSS signals. 
     According to this embodiment, as shown in  FIG. 3 , the flexible base plate  21  may be divided into a middle area and a peripheral area around the middle area. The orthographic projection, on the flexible base plate  21 , of the first auxiliary electrode  221  in the first metal layer  22  may be located in the middle area, and the orthographic projection, on the flexible base plate  21 , of the bonding electrode  222  in the first metal layer  22  may be located in the peripheral area. Of course, the specific positions of the first auxiliary electrode  221  and the bonding electrode  222  may be set upon actual situations, and are not limited in this embodiment. 
     According to this implementation, the flexible backplane drilling technology is adopted. 
     That is, the first metal layer  22  is manufactured on a glass base plate first, wherein the first metal layer  22  comprises the bonding electrode  222  and the first auxiliary electrode  221 ; then, the flexible base plate  21 , the second metal layer  27 , the flat layer  28  and the pixel unit are manufactured in turn on the first metal layer  22 , wherein the second metal layer  27  comprises the signal lead wire  272  and the jumper electrode  271 , the signal lead wire  272  is connected with the bonding electrode  222  through a via hole formed in the flexible base plate  21 , and the jumper electrode  271  is connected with the first auxiliary electrode  221  via another hole formed on the flexible base plate  21 . When manufacturing of the pixel unit and the electrodes of an LED is completed, a flat layer may also be coated to expose the electrodes of the LED; then, the glass base plate is removed to expose the first auxiliary electrode  221  and the bonding electrode  222 , and the subsequent bonding and assembling procedures are carried out later. Use of the flexible backplane drilling technology avoids the double-sided treatment and lateral bonding, so the process is easy and highly feasible, and frame-less display may be implemented. 
     Another embodiment of the disclosure further provides a displaying device, comprising the displaying substrate according to any one of the embodiments. 
     It should be noted that, the displaying device according to this embodiment may be any product or part with a 2D or 3D display function, such as a display panel, electronic paper, mobile phone, tablet personal computer, television, notebook computer, digital photo frame, navigator, etc. 
     Another embodiment of the disclosure further provides a manufacturing method of the displaying substrate. Referring to  FIG. 7 , the manufacturing method comprises the following steps: 
     Step  701 : a first metal layer is formed on one side of a flexible base plate, wherein the first metal layer comprises a first auxiliary electrode, and the first auxiliary electrode is connected with a first power cord. 
     Step  702 : a pixel unit is formed on a side of the flexible base plate away from the first metal layer, wherein the pixel unit comprises a plurality of thin-film transistors arranged on the side of the flexible base plate away from the first metal layer, and an insulating layer and a second auxiliary electrode that are arranged in layer configuration on a side of the plurality of thin-film transistors away from the flexible base plate, the insulating layer is arranged close to the flexible base plate, and the second auxiliary electrode is connected with a second power cord; wherein the plurality of thin-film transistor comprise a drive transistor, a source of the drive transistor is connected with the first auxiliary electrode, a drain of the drive transistor is connected with a first electrode of a light emitting device , and a second electrode of the light emitting device is connected with the second auxiliary electrode. 
     According to an optional implementation, step  701  may specifically comprise: providing a hard base plate first; second, forming the first metal layer on the hard base plate; and finally, forming the flexible base plate on a side of the first metal layer away from the hard base plate. After step  702 , this implementation may further comprise peeling off the hard base plate to obtain the displaying substrate. 
     According to an optional implementation, prior to step  702 , the method may further comprise: forming a second metal layer and a flat layer in layer configuration on a side of the flexible base plate away from the first metal layer, wherein the second metal layer comprises a jumper electrode and a signal lead wire, the jumper electrode is connected with the first auxiliary electrode through a via hole formed in the flexible base plate, the jumper electrode is also connected with the source of the drive transistor, and the signal lead wire is connected with a bonding electrode through a via hole formed in the flexible substrate; and correspondingly, step  702  may specifically comprise: forming the pixel unit on a side of the flat layer away from the flexible base plate. 
     Specifically, the first metal layer may be formed through patterning on the hard base plate such as a glass substrate first, wherein the first metal layer comprises the bonding electrode and the first auxiliary electrode; second, the flexible base plate such as PI (Polyimide) and the second metal layer are manufactured in turn on the first metal layer, wherein the second metal layer comprises the signal lead wire and the jumper electrode, the signal lead wire is connected with the bonding electrode through a via hole formed in the flexible base plate, and the jumper electrode is connected with the first auxiliary electrode via another hole formed in the flexible base plate; third, the flat layer and the pixel unit are manufactured on the second metal layer; fourth, another fiat layer may be coated to expose electrodes of the LED after manufacturing of the pixel unit and the electrodes of the LED is completed; and finally, the glass substrate is removed to expose the first auxiliary electrode and the bonding electrode, and then bonding and assembling are performed. 
     The displaying substrate according to any one of the above embodiments is able to be manufactured by adopting the manufacturing method according to this embodiment. The structure and beneficial effects of the manufactured displaying substrate may be understood with reference to the description of the aforementioned embodiments, and are not repeated here. 
     The embodiments of the disclosure provide a displaying substrate and a displaying device. The displaying substrate comprises the flexible base plate; the first metal layer arranged on one side of the flexible base plate, wherein the first metal layer comprises the first auxiliary electrode, and the first auxiliary electrode is connected with the first power cord; and the pixel unit arranged on s side of the flexible base plate away from the first metal layer, wherein the pixel unit comprises a plurality of thin-film transistors arranged on the side of the flexible base plate away from the first metal layer, and the insulation layer and the second auxiliary electrode that are arranged in layer configuration on a side of the plurality of thin-film transistors away from the flexible base plate, the insulating layer is arranged close to the flexible base plate, and the second auxiliary electrode is connected with the second power cord; wherein the plurality of thin-film transistors comprise the drive transistor, the source of the drive transistor is connected with the first auxiliary electrode, the drain of the drive transistor is connected with the first electrode of the light emitting device, and the second electrode of the light emitting device is connected with the second auxiliary electrode. According to the technical solution of the disclosure, the distance between the first auxiliary electrode and the second auxiliary electrode is increased by locating the first auxiliary electrode and the second auxiliary electrode on two sides of the flexible base plate, the thin-film transistors and the insulating layer, thereby greatly reducing the probability of a short circuit between the first auxiliary electrode and the second auxiliary electrode, and assisting in enhancement of the product yield and reliability. In addition, the first auxiliary electrode is arranged on a side of the flexible base plate away from the second auxiliary electrode, so comparing with existing structures, the manufacturing process of at least one insulating layer may be reduced, the process flow is simplified, and the product yield is enhanced. 
     The embodiments in this specification are described progressively, and differ in to respective highlights. Similar or identical contents of the embodiments may be used for mutual reference. 
     Finally, it should be noted that relational terms in this specification such as “first” and “second” are merely used to distinguish one entity or operation from the other one, and do not definitely indicate or imply any actual relation or sequence between these entities or operations. In addition, the terms “comprise” and “include” and any other variations are intended to refer to non-exclusive inclusion, so a process, method, article or device comprising a series of elements not only comprise those elements listed, but also include other elements that are not explicitly listed or inherent elements of the process, method, article or device. In the absence of more restrictions, a process, method, article or device comprising an element defined by “one” shall not exclusive of other identical elements. 
     The above describes in detail the displaying substrate and displaying device according to the embodiments of the disclosure. In this specification, the principle and implementation of the disclosure are expounded by means of specific embodiments, which are described merely for assisting those skilled in the art in understanding the method and core concept of the disclosure. Moreover, those ordinarily skilled in the art may make variations to the specific embodiments and disclosure scope based on the idea of the disclosure. So, the contents in this specification should not be construed as limitations of the disclosure.