Patent Publication Number: US-2023165111-A1

Title: Light-emitting substrate and light-emitting apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national phase entry under 35 USC 371 of International Patent Application No. PCT/CN2021/132276, filed on Nov. 23, 2021, which claims priority to Chinese Patent Application No. 202110412804.2, filed on Apr. 16, 2021, which are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies, and in particular, to a light-emitting substrate and a light-emitting apparatus. 
     BACKGROUND 
     When a self-luminous device, especially an organic light-emitting diode (OLED), is used for lighting, a significant advantage is that a large-sized surface light source with any shape may be achieved. 
     SUMMARY 
     In an aspect, a light-emitting substrate is provided. The light-emitting substrate includes a substrate, a plurality of power supply lines disposed on the substrate, a plurality of light-emitting devices disposed on the substrate and a plurality of resistance lines disposed on the substrate. Each light-emitting device includes, in a direction perpendicular to the substrate, a first electrode and a second electrode that are disposed sequentially, and a light-emitting functional layer disposed between the first electrode and the second electrode. The first electrode is closer to the substrate than the second electrode. An end of each resistance line is coupled to a power supply line, another end of each resistance line is coupled to a first electrode of a light-emitting device, and each resistance line and the first electrode coupled thereto are disposed in a same layer. 
     In some embodiments, the plurality of light-emitting devices include a plurality of lines of light-emitting devices arranged in a first direction, and light-emitting devices in each line of light-emitting devices are arranged in a second direction; the first direction intersects the second direction. The plurality of power supply lines include a first power supply line and a second power supply line that extend in the second direction and are arranged adjacent to each other in the first direction. The first power supply line and the second power supply line are provided with at least one line of light-emitting devices therebetween, and a first electrode of each light-emitting device in the at least one line of light-emitting devices is coupled to the first power supply line or the second power supply line. 
     In some embodiments, the plurality of light-emitting devices include a first light-emitting device and a second light-emitting device that are adjacent in the first direction or in the second direction. The plurality of resistance lines include a first resistance line and a second resistance line; the first resistance line is coupled to a first electrode of the first light-emitting device, and the second resistance line bypasses at least one edge of the first electrode of the first light-emitting device and is coupled to a first electrode of the second light-emitting device. 
     In some embodiments, the second resistance line is adjacent to the first electrode of the first light-emitting device. 
     In some embodiments, the first light-emitting device and the second light-emitting device are located between the first power supply line and the second power supply line; and the first power supply line, the first light-emitting device, the second light-emitting device and the second power supply line are sequentially arranged in the first direction. The first electrode of the first light-emitting device is coupled to the second power supply line through the first resistance line, the first electrode of the second light-emitting device is coupled to the first power supply line through the second resistance line, and the first resistance line bypasses at least one edge of the first electrode of the second light-emitting device and is coupled to the first electrode of the first light-emitting device. 
     In some embodiments, at least a part of the first resistance line and at least a part of the second resistance line are distributed on two opposite sides, arranged in the second direction, of a group of the first electrode of the first light-emitting device and the first electrode of the second light-emitting device. 
     In some embodiments, an end of the first resistance line coupled to the first electrode of the first light-emitting device extends to an edge of the first electrode of the first light-emitting device proximate to the first power supply line; and/or, an end of the second resistance line coupled to the first electrode of the second light-emitting device extends to an edge of the first electrode of the second light-emitting device proximate to the second power supply line. 
     In some embodiments, the first power supply line includes a first coupling portion. The first light-emitting device and the second light-emitting device are arranged in the second direction. The first resistance line includes a first resistance segment and a second resistance segment that are connected to each other, an end of the first resistance segment away from a connection point is coupled to the first coupling portion, and an end of the second resistance segment away from the connection point is coupled to the first electrode of the first light-emitting device, the connection point is a position where the first resistance segment is connected to the second resistance segment. The second resistance line includes the first resistance segment and a third resistance segment connected to the connection point, and an end of the third resistance segment away from the connection point is coupled to the first electrode of the second light-emitting device. 
     In some embodiments, an orthographic projection of the first resistance segment on the substrate and an orthographic projection of the first power supply line on the substrate have an overlapped region therebetween. 
     In some embodiments, the first electrode of the first light-emitting device and the first electrode of the second light-emitting device are arranged side by side, and the first electrode of the second light-emitting device is adjacent to the first resistance segment. The second resistance segment extends in the first direction and is located on a side of the first electrode of the first light-emitting device away from the first electrode of the second light-emitting device, and the third resistance segment extends in the second direction and is located between the first resistance segment and the first electrode of the first light-emitting device. 
     In some embodiments, an end of the second resistance segment coupled to the first electrode of the first light-emitting device extends to an edge of the first electrode of the first light-emitting device proximate to the second power supply line; and an end of the third resistance segment coupled to the first electrode of the second light-emitting device extends to an edge of the first electrode of the second light-emitting device proximate to the first power supply line. 
     In some embodiments, a dimension of the first electrode of the second light-emitting device in the first direction is greater than a dimension of the first electrode of the first light-emitting device in the first direction. 
     In some embodiments, the light-emitting substrate further includes a pixel defining layer. The pixel defining layer defines a plurality of openings, the plurality of openings include a first opening and a second opening, the first light-emitting device is disposed in the first opening, and the second light-emitting device is disposed in the second opening. A dimension of the second opening in the first direction is greater than a dimension of the first opening in the first direction. 
     In some embodiments, the plurality of light-emitting devices further include a third light-emitting device and a fourth light-emitting device. The plurality of resistance lines further include a third resistance line and a fourth resistance line. An end of the third resistance line is coupled to the first coupling portion, and another end of the third resistance line is coupled to a first electrode of the third light-emitting device. An end of the fourth resistance line is coupled to the first coupling portion, and another end of the fourth resistance line is coupled to a first electrode of the fourth light-emitting device. About a first straight line, passing through the first coupling portion and perpendicular to the first power supply line, on a plane where the substrate is located, a structure of the first resistance line, the second resistance line, the third resistance line and the fourth resistance line is axisymmetric, and/or, a structure of the first light-emitting device, the second light-emitting device, the third light-emitting device and the fourth light-emitting device is axisymmetric. 
     In some embodiments, the second power supply line includes a second coupling portion. The plurality of light-emitting devices further include a fifth light-emitting device and a sixth light-emitting device. The plurality of resistance lines further include a fifth resistance line and a sixth resistance line. An end of the fifth resistance line is coupled to the second coupling portion, and another end of the fifth resistance line is coupled to a first electrode of the fifth light-emitting device. An end of the sixth resistance line is coupled to the second coupling portion, and another end of the sixth resistance line is coupled to a first electrode of the sixth light-emitting device. About a second straight line, parallel to both the first power supply line and the second power supply line and located between the first light-emitting device and the second light-emitting device, on a plane where the substrate is located, a structure of the first resistance line, the second resistance line, the fifth resistance line and the sixth resistance line is axisymmetric, and/or, a structure of the first light-emitting device, the second light-emitting device, the fifth light-emitting device and the sixth light-emitting device is axisymmetric. 
     In some embodiments, the plurality of light-emitting devices further include a seventh light-emitting device and an eighth light-emitting device. The plurality of resistance lines further include a seventh resistance line and an eighth resistance line. An end of the seventh resistance line is coupled to the second coupling portion, and another end of the seventh resistance line is coupled to a first electrode of the seventh is light-emitting device. An end of the eighth resistance line is coupled to the second coupling portion, and another end of the eighth resistance line is coupled to a first electrode of the eighth light-emitting device. About a third straight line, passing through the second coupling portion and perpendicular to the second power supply line, on the plane where the substrate is located, a structure of the fifth resistance line, the sixth resistance line, the seventh resistance line and the eighth resistance line is axisymmetric, and/or, a structure of the fifth light-emitting device, the sixth light-emitting device, the seventh light-emitting device and the eighth light-emitting device is axisymmetric. 
     In some embodiments, the plurality of power supply lines further include a third power supply line. The third power supply line is parallel to the first power supply line, and the third power supply line is located on a side of the second power supply line away from the first power supply line and is adjacent to the second power supply line. About a fourth straight line, passing through the second coupling portion and parallel to the first power supply line, on the plane where the substrate is located, a structure of all resistance lines coupled to the second power supply line is axisymmetric, and/or, a structure of all light-emitting device coupled to the second power supply line is axisymmetric. 
     In some embodiments, the plurality of power supply lines and the plurality of resistance lines are provided with an insulating layer therebetween, and the insulating layer is provided with a plurality of via holes therein. The plurality of via holes include a first via hole corresponding to a position of the first coupling portion and a second via hole corresponding to a position of the second coupling portion, and a size of the second via hole is substantially equal to a size of the first via hole. 
     In some embodiments, each resistance line has substantially a same resistance value. 
     In another aspect, a light-emitting apparatus is provided. The light-emitting apparatus includes the light-emitting substrate as described above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe technical solutions in the present disclosure more clearly, accompanying drawings to be used in some embodiments of the present disclosure will be introduced briefly below. Obviously, the accompanying drawings to be described below are merely accompanying drawings of some embodiments of the present disclosure, and a person of ordinary skill in the art may obtain other drawings according to these accompanying drawings. In addition, the accompanying drawings in the following description may be regarded as schematic diagrams, and are not limitations on actual sizes of products, actual processes of methods and actual timings of signals involved in the embodiments of the present disclosure. 
         FIG.  1    is a top view of a light-emitting substrate, in accordance with some embodiments; 
         FIG.  2    is a sectional view taken along the A-A′ direction in  FIG.  1   ; 
         FIG.  3    is a diagram showing a structure and an equivalent circuit of an anode and a cathode being short-circuited, in a case where a plurality of resistance lines are not provided in the related art; 
         FIG.  4    is a diagram showing a structure and an equivalent circuit of an anode and a cathode being short-circuited, in a case where a plurality of resistance lines are provided, in accordance with some embodiments; 
         FIG.  5    is a comparison diagram of an aperture ratio of a light-emitting device having a first electrode with a dimension of 100 μm and an aperture ratio of a light-emitting device having a first electrode with a dimension of 50 μm, in accordance with some embodiments; 
         FIG.  6    is a top view of another light-emitting substrate, in accordance with some embodiments; 
         FIG.  7    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  8    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  9    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  10    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  11    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  12    is a top view of yet another light-emitting substrate, in accordance with some embodiments; 
         FIG.  13    is a top view of yet another light-emitting substrate, in accordance with some embodiments; and 
         FIG.  14    is a flow diagram of a method for manufacturing a light-emitting substrate, in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Technical solutions in some embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are merely some but not all embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure shall be included in the protection scope of the present disclosure. 
     Unless the context requires otherwise, throughout the specification and the claims, the term “comprise” and other forms thereof such as the third-person singular form “comprises” and the present participle form “comprising” are construed in an open and inclusive sense, i.e., “including, but not limited to”. In the description of the specification, the terms such as “one embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example” or “some examples” are intended to indicate that specific features, structures, materials or characteristics related to the embodiment(s) or example(s) are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms do not necessarily refer to the same embodiment(s) or example(s). In addition, these specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any suitable manner. 
     Hereinafter, the terms such as “first” and “second” are used for descriptive purposes only, but are not to be construed as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with “first” or “second” may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the term “a plurality of” or “the plurality of” means two or more. 
     In the description of some embodiments, the expressions “coupled” and “connected” and derivatives thereof may be used. For example, the term “connected” may be used in the description of some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. For another example, the term “coupled” may be used in the description of some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. However, the term “coupled” or “communicatively coupled” may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein. 
     The phrase “at least one of A, B and C” has a same meaning as the phrase “at least one of A, B or C”, and they both include the following combinations of A, B and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C. 
     The phrase “A and/or B” includes the following three combinations: only A, only B, and a combination of A and B. 
     The phrase “applicable to” or “configured to” as used herein means an open and inclusive expression, which does not exclude devices that are applicable to or configured to perform additional tasks or steps. 
     In addition, the phrase “based on” as used herein is meant to be open and inclusive, since a process, step, calculation or other action that is “based on” one or more of the stated conditions or values may, in practice, be based on additional conditions or values exceeding those stated. 
     The term “about” or “approximately” as used herein includes a stated value and an average value within an acceptable range of deviation of a particular value. The acceptable range of deviation is determined by a person of ordinary skill in the art in view of the measurement in question and errors associated with the measurement of a particular quantity (i.e. limitations of the measurement system). 
     Exemplary embodiments are described herein with reference to sectional views and/or plan views as idealized exemplary drawings. In the accompanying drawings, thicknesses of layers and sizes of regions are enlarged for clarity. Variations in shapes with respect to the accompanying drawings due to, for example, manufacturing technologies and/or tolerances may be envisaged. Therefore, the exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but including deviations in the shapes due to, for example, manufacturing. For example, an etched region shown in a rectangular shape generally has a feature of being curved. Therefore, the regions shown in the accompanying drawings are schematic in nature, and their shapes are not intended to show actual shapes of the regions in a device, and are not intended to limit the scope of the exemplary embodiments. 
     Some embodiments of the present disclosure provide a light-emitting apparatus. The light-emitting apparatus includes a light-emitting substrate, and may of course include other components, such as a circuit for providing electrical signals for the light-emitting substrate to drive the light-emitting substrate to emit light. The circuit may be referred to as a control circuit, which may include a circuit board electrically connected to the light-emitting substrate and/or an integrated circuit (IC) electrically connected to the light-emitting substrate. 
     The light-emitting apparatus may be a lighting apparatus. For example, the light-emitting apparatus may be a backlight module of a liquid crystal display apparatus, a lamp for internal or external lighting (e.g., a car lamp), a kind of signal lamps, or the like. 
     In some embodiments, the light-emitting substrate may be any one of self-luminous light-emitting substrates such as an organic light-emitting diode (OLED) light-emitting substrate or a quantum dot light-emitting diode (QLED) light-emitting substrate. 
     A significant advantage of the self-luminous light-emitting substrates is that a large-sized surface light source with any shape may be achieved. However, the self-luminous light-emitting device (e.g., an OLED light-emitting device) is a laminated thin film device, and a distance between an anode and a cathode thereof is relatively small. In particular, dust particles will inevitably be introduced in a process of manufacturing the light-emitting device, and the introduction of the dust particles and defects such as pinholes, cracks, step differences and coating roughness in the light-emitting device may cause direct contact between the anode and the cathode, thereby forming defect points (also known as short-circuit points) which affect the production yield of self-luminous light-emitting substrates. 
     The light-emitting substrate may include one or more light-emitting devices. In a case where one light-emitting substrate is adopted, a size of the light-emitting device is relatively large, and there is a large probability that the anode is in direct contact with the cathode, which is not conducive to improving the production yield of the light-emitting substrate. In a case where a plurality of light-emitting devices are adopted, although the probability that the anode is in direct contact with the cathode may be effectively reduced, it is still difficult to avoid the above short-circuit defects. 
     In the related art, the distance between the anode and the cathode may be increased by means of adding a conductive functional layer in light-emitting device, so as to reduce the probability that the anode is in direct contact with the cathode, thus avoid the occurrence of short-circuit defects. However, an increase in thickness of the light-emitting device will inevitably lead to an increase in a turn-on voltage of the light-emitting device and a decrease in the efficiency of the light-emitting device, thereby resulting in a decrease in the overall performance of the light-emitting device. 
     Some embodiments of the present disclosure provide a light-emitting substrate. Referring to  FIGS.  1  and  2   , the light-emitting substrate  1  includes a substrate  11 , a plurality of power supply lines  12  disposed on the substrate  11 , and a plurality of light-emitting devices  13  disposed on the substrate  11 . Each light-emitting device  13  includes, in a direction perpendicular to the substrate  11 , a first electrode  131  and a second electrode  132  that are arranged sequentially, and a light-emitting functional layer  133  disposed between the first electrode  131  and the second electrode  132 . The first electrode  131  is closer to the substrate  11  than the second electrode  132 . Each light-emitting device  13  may be coupled to a power supply line  12  through a respective first electrode  131  thereof. 
     As shown in  FIG.  1   , the plurality of power supply lines  12  may be in a shape of a grid. In this case, the plurality of power supply lines  12  may be connected to the control circuit through some or all of the plurality of power supply lines  12 , so as to drive each light-emitting device  13  to emit light according to the electrical signals provided by the control circuit. 
     The light-emitting device  13  may be an OLED light-emitting device, and in this case, the light-emitting functional layer  133  may include an organic light-emitting layer. In some other embodiments, the light-emitting device  13  may be a QLED light-emitting device, and in this case, the light-emitting functional layer  133  may include a quantum dot light-emitting layer. In the following, the embodiments of the present disclosure will be described by considering an example in which the light-emitting device  13  is the OLED light-emitting device. 
     In some embodiments, as shown in  FIG.  2   , the first electrode  131  may be the anode, and in this case, the second electrode  132  is the cathode. In some other embodiments, the first electrode  131  may be the cathode, and in this case, the second electrode  132  is the anode. 
     In some embodiments, a material of the anode may be selected from materials with high work functions that may be, for example, transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2) and zinc oxide (ZnO), or metal materials such as silver (Ag) and silver alloys, and aluminum (Al) and aluminum alloys, or composite materials of the above materials that are stacked (e.g., Ag/ITO, Al/ITO, Ag/IZO and Al/IZO, where “Ag/ITO” is referred to as a stacked structure of a metallic silver electrode and an ITO electrode). A material of the cathode may be selected from materials with low work functions, such as lithium fluoride (LiF/Al), a metal Al, Ag or magnesium (Mg), or an alloy material with a low work function (e.g., a magnesium-aluminum alloy or a magnesium-silver alloy). 
     In some embodiments, as shown in  FIG.  1   , the light-emitting substrate  1  further includes a plurality of resistance lines  14 . An end of each resistance line  14  is coupled to a power supply line  12 , and the other end of each resistance line  14  is coupled to a first electrode  131  of a light-emitting device  13 . Each resistance line  14  and the first electrode  131  coupled thereto are disposed in a same layer. 
     The part (a) in  FIG.  3    is a diagram showing a structure of the anode and the cathode of the light-emitting device  13  being short-circuited in a case where the plurality of resistance lines  14  are not provided; and the part (b) in  FIG.  3    is a diagram showing an equivalent circuit of the anode and the cathode of the light-emitting device  13  being short-circuited in the case where the plurality of resistance lines  14  are not provided. The part (a) in  FIG.  4    is a diagram showing a structure of the anode and the cathode of the light-emitting device  13  being short-circuited in a case where the plurality of resistance lines  14  are provided; and the part (b) in  FIG.  4    is a diagram showing an equivalent circuit of the anode and the cathode of the light-emitting device  13  being short-circuited in the case where the plurality of resistance lines  14  are provided. 
     It can be seen from  FIGS.  3  and  4    that, in the case where the plurality of resistance lines  14  are not provided, the current tends to flow through the short-circuit point(s) when the light-emitting device  13  works, so that the current hardly flows through other positions of the light-emitting device  13 , and thus light exiting from the light-emitting device  13  is reduced or even eliminated. In the case where the plurality of resistance lines  14  are provided, due to the existence of each resistance line  14 , it may be possible to prevent the current from tending to flow through the short-circuit point(s), so as to prevent the short circuits. Compared with the related art in which the conductive functional layer is added to the light-emitting device  13  to increase the distance between the anode and the cathode but increase the overall thickness of the light-emitting device  13 , the plurality of resistance lines  14  will not affect the thickness of the light-emitting device  13 . In addition, compared with the related art in which the light-emitting substrate  1  includes only one light-emitting device  13 , the plurality of light-emitting devices  13  are arranged to pixelate the light-emitting substrate  1 , so that the probability that the anode is in direct contact with the cathode may be reduced. In addition, by providing the resistance line  14  between the first electrode  131  of each light-emitting device  13  and a power supply line  12  coupled thereto, light-emission of other light-emitting devices  13  may not be affected in a case where any light-emitting device  13  is short-circuited, thereby improving the yield of the entire light-emitting substrate  1 . 
     In addition, each resistance line  14  and the first electrode  131  coupled thereto are arranged in the same layer, so that it may be possible to reduce the manufacturing processes and the manufacturing difficulty. 
     It will be noted that, although it may be possible to reduce the probability that the anode is in direct contact with the cathode and improve the yield by pixelating the light-emitting substrate  1 , it does not mean that the smaller the size of the light-emitting device  13 , the better the light-emitting device  13 . For example,  FIG.  5    is a comparison diagram of an aperture ratio of a light-emitting device  13  having a first electrode  131  with a dimension of 100 μm and an aperture ratio of a light-emitting device  13  having a first electrode  131  with a dimension of 50 μm. The part (a) in  FIG.  5    is a diagram showing a structure of the light-emitting device  13  having the first electrode  131  with the dimension of 100 μm; and the part (b) in  FIG.  5    is a diagram showing a structure of the light-emitting device  13  having the first electrode  131  with the dimension of 50 μm. As can be seen from  FIG.  5   , in a case where the dimension of the first electrode  131  of the light-emitting device  13  is switched from 100 μm to 50 μm, the aperture ratio of the light-emitting device  13  is reduced greatly. Moreover, it is found through calculation that, in the case where the dimension of the first electrode  131  of the light-emitting device  13  is 100 μm, the aperture ratio may be greater than 80%. However, in the case where the dimension of the first electrode  131  of the light-emitting device  13  is 50 μm, the aperture ratio may be less than 50%, which may affect the luminance of the light-emitting device  13  significantly, and thus further affect the service life of the light-emitting device  13 . In particular, the service life of the car lamp is generally required to be greater than 15 years, thus a relatively large aperture ratio is particularly important. 
     It can be seen according to that each resistance line  14  and the first electrode  131  coupled thereto are disposed in the same layer that, in order to ensure a sufficient length of each resistance line  14  to ensure a sufficient resistance value of each resistance line  14  for preventing short circuit, each resistance line  14  may be disposed at a periphery of multiple first electrodes  13 , and there is a gap between each resistance line  14  and each first electrode  131 .  FIG.  6    shows an example in which each resistance line  14  is disposed around a single first electrode  131 . In this way, for a bottom-emission light-emitting device, the dimension of each first electrode  131  is not only related to an area occupied by the plurality of supply power lines  12 , but also related to an area occupied by the plurality of resistance lines  14 . 
     In some embodiments, an orthographic projection of each power supply line  12  on the substrate  11  is located outside an orthographic projection of a portion of the light-emitting functional layer  133  of each light-emitting device  13  in contact with the first electrode  131  of the light-emitting device  13  on the substrate  11 . 
     The description that the orthographic projection of each power supply line  12  on the substrate  11  is located outside the orthographic projection of the portion of the light-emitting functional layer  133  of each light-emitting device  13  in contact with the first electrode  131  of the light-emitting device  13  on the substrate  11  means that, the orthographic projection of each power supply line  12  on the substrate  11  does not overlap with the orthographic projection of the portion of the light-emitting functional layer  133  of each light-emitting device  13  in contact with the first electrode  131  of the light-emitting device  13  on the substrate  11 . That is, in a case where the light emitted by each light-emitting device  13  exits from the substrate  11 , each power supply line  12  will not affect the exit light. In this case, the light-emitting substrate  1  may be a bottom-emission light-emitting substrate, and the first electrode  131  may be a transparent anode. 
     In some embodiments, as shown in  FIG.  2   , the light-emitting substrate  1  may further include a pixel defining layer  15  disposed on the substrate  11 . The pixel defining layer  15  defines a plurality of openings K, and each light-emitting device  13  may be disposed in an opening K. 
     In this case, as shown in  FIG.  2   , the first electrode  131  of the light-emitting device  13  may be disposed on a side of the pixel defining layer  15  proximate to the substrate  11 , and the portion of the light-emitting functional layer  133  in contact with the first electrode  131  is represented by the dotted box W in  FIG.  2   . In the case where the light-emitting substrate  1  is the bottom-emission light-emitting substrate, the orthographic projection of each power supply line  12  on the substrate  11  is located outside the region represented by the dotted box W.  FIG.  6    shows an example in which the orthographic projection of each power supply line  12  on the substrate  11  is located outside the orthographic projection of the portion of the light-emitting functional layer  133  of each light-emitting device  13  in contact with the first electrode  131  of each light-emitting device  13  on the substrate  11 . In this example, the plurality of power supply lines  12  are in the shape of the grid, and each resistance line  14  is disposed around a first electrode  131  of a single light-emitting device  13 . When the power is supplied, the current flows through the resistance line  14 , the first electrode  131 , the light-emitting functional layer  133  and the second electrode  132  in sequence after flowing through the power supply line  12 . According to the path that the current flows through, a material, a length and a width of the resistance line  14  may be selected to reasonably set the resistance of the resistance line  14  in practical applications, so as to prevent short circuit. 
     In some embodiments, as shown in  FIG.  6   , each resistance line  14  has substantially the same resistance value. It can be seen from the voltage being equal to the current multiplied by the resistance that, in a case where a voltage applied to an end of the resistance line  14  coupled to the power supply line  12  and a voltage applied to the second electrode  132  are substantially the same, since each resistance line  14  has substantially the same resistance value, it may ensure that a divided voltage between the first electrode  131  and the second electrode  132  of each light-emitting device  13  is substantially the same, thereby ensuring luminance uniformity of the plurality of light-emitting devices  13  to the greatest extent. 
     In some embodiments, it can be seen according to that each resistance line  14  and the first electrode  131  coupled thereto are disposed in the same layer that, as shown in  FIG.  2   , an insulating layer  10  may be provided between each resistance line  14  and the plurality of power supply lines  12 . The insulating layer  10  is provided with a plurality of via holes O therein, and each resistance line  14  may be coupled to a power supply line  12  through a via hole O in the insulating layer  10 . 
     In some embodiments, as shown in  FIGS.  7 ,  8 ,  9  and  10   , the plurality of light-emitting devices  13  form a plurality of lines of light-emitting devices  13  arranged in a first direction (as shown by the arrow a in FIGS,  7 ,  8 ,  9  and  10 ), light-emitting devices  13  in each line of light-emitting devices  13  are arranged in a second direction (as shown by the arrow b in  FIGS.  7 ,  8 ,  9  and  10   ), and the first direction intersects the second direction. The plurality of power supply lines  12  include a first power supply line  12   a  and a second power supply line  12   b  that extend in the second direction and are arranged adjacent to each other in the first direction. the first power supply line  12   a  and the second power supply line  12   b  are provided with at least one line of light-emitting devices  12  therebetween, and a first electrode  131  of each light-emitting device  13  in the at least one line of light-emitting devices  13  is coupled to the first power supply line  12   a  or the second power supply line  12   b.    
     The plurality of light-emitting devices  12  may be arranged in a form of rows and columns. For example, as shown in  FIGS.  7 ,  8 ,  9  and  10   , the first direction is perpendicular to the second direction. In this case, as shown in  FIGS.  7  and  8   , the first direction may be a column direction of the plurality of light-emitting devices  13 , and the second direction is a row direction of the plurality of light-emitting devices  13 . Alternately, as shown in  FIGS.  9  and  10   , the first direction may be the row direction of the plurality of light-emitting devices  13 , and the second direction is the column direction of the plurality of light-emitting devices  13 . 
     In a case where the first direction is the column direction of the plurality of light-emitting devices  13  and the second direction is the row direction of the plurality of light-emitting devices  13 , as shown in  FIGS.  7  and  8   , the first power supply line  12   a  and the second power supply line  12   b  extend in the row direction of the plurality of light-emitting devices  13  and are arranged in the column direction of the plurality of light-emitting devices  13 . In a case where the first direction is the row direction of the plurality of light-emitting devices  13  and the second direction is the column direction of the plurality of light-emitting devices, as shown in  FIGS.  9  and  10   , the first power supply line  12   a  and the second power supply line  12   b  extend in the column direction of the plurality of light-emitting devices  13  and are arranged in the row direction of the plurality of light-emitting devices  13 . 
     In either case, the description that the at least one line of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b  means that, one line of light-emitting devices  13  or more than two lines of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b.  For example, as shown in  FIGS.  7  and  8   , the first power supply line  12   a  and the second power supply line  12   b  extend in the row direction of the plurality of light-emitting devices  13  and are arranged in the column direction of the plurality of light-emitting devices  13 , the description that the at least one line of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b  means that, one row of light-emitting devices  13  or more than two rows of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b.  For another example, as shown in  FIGS.  9  and  10   , the first power supply line  12   a  and the second power supply line  12   b  extend in the column direction of the plurality of light-emitting devices  13  and are arranged in the row direction of the plurality of light-emitting devices  13 , the description that the at least one line of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b  means that, one column of light-emitting devices  13  or more than two columns of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b.    
     In these embodiments, more than two lines of light-emitting devices  13  are provided between the first power supply line  12   a  and the second power supply line  12   b,  so that it may be possible to reduce the area occupied by the power supply lines  12  and increase an area of the first electrode  131  of each light-emitting device  13  located between the first power supply line  12   a  and the second power supply line  12   b  while ensuring the power supply to each light-emitting device  13  is ensured, thereby increasing the aperture ratio. 
     In conjunction with  FIGS.  6 ,  2  and  8   , in term of the design limit, t is assumed that the dimensions occupied by the power supply line  12 , the insulating layer  10 , the pixel defining layer  15  and the first electrode  131  between two adjacent light-emitting devices  13  are each 2 μm. In this case, minimum dimensions on two sides of a light-emitting device  13  (the minimum dimensions occupied by the power supply line  12 , the insulating layer  10 , the pixel defining layer  15  and the first electrode  131  are each 2 μm, a minimum dimension occupied by all of the power supply line  12 , the insulating layer  10 , the pixel defining layer  15  and the first electrode  131  is 8 μm that is equal to 2 μm by 4, and the minimum dimensions on the two sides of the light-emitting device  13  are both 16 μm that is equal to 8 μm by 2) are subtracted from an original dimension of 50 μm in a region, so that a maximum dimension, for emitting light in effect, of the first electrode  131  in the light-emitting device  13  is 34 μm. Therefore, the aperture ratio is equal to (34×34)/(50 ×50)×100%, which is approximately equal to 46%. 
     In conjunction with  FIGS.  6 ,  8  and  9   , after removing the power supply line  12  between the first power supply line  12   a  and the second power supply line  12   b,  since there is no power supply line  12  between two adjacent light-emitting devices  13 , the dimension of the first electrode  131  of each light-emitting device  13  may increase by 2 μm to 4 μm on a basis of the original dimension. In this case, the aperture ratio may approximately be 52% (which is equal to (36×36)/(50×50)×100%) to 57% (which is equal to (38×38)/(50×50)×100%). As a result, the aperture ratio may be greatly improved, which is beneficial to improve the service life of the light-emitting device  13 . 
     In some embodiments, as shown in  FIGS.  7 ,  8     9  and  10 , the plurality of light-emitting devices  13  include a first light-emitting device  13   a  and a second light-emitting device  13   b  that are adjacent in the first direction or in the second direction. The plurality of resistance lines  14  include a first resistance line  14   a  and a second resistance line  14   b.  The first resistance line  14   a  is coupled to a first electrode  131  of the first light-emitting device  13   a,  and the second resistance line  14   b  bypasses at least one edge L 1  of the first electrode  131  of the first light-emitting device  13   a  and is coupled to a first electrode  131  of the second light-emitting device  13   b.    
     The description that the second resistance line  14   b  bypasses the at least one edge of the first electrode  131  of the first light-emitting device  13   a  and is coupled to the first electrode  131  of the second light-emitting device  13   b  means that, the second resistance line  14   b  is disposed at a periphery of the at least one edge of the first electrode  131  of the first light-emitting device  13   a  and is coupled to the first electrode  131  of the second light-emitting device  13   b.    
     As shown in  FIG.  6   , the second resistance line  14   b  surrounds the first electrode  131  of the second light-emitting device  13   b,  an area occupied by the second resistance line  14   b  and a gap between the second resistance line  14   b  and the first electrode  131  of the second light-emitting device  13   b  both determine that the dimension of the first electrode  131  of the second light-emitting device  13   b  is relatively small. In these embodiments, the second resistance line  14   b  bypasses the at least one edge of the first electrode  131  of the first light-emitting device  13   a  and is coupled to the first electrode of the second light-emitting device  13   b,  so that it may be possible to shorten the portion of the second resistance line  14   b  at the periphery of the first electrode  131  of the second light-emitting device  13   b  and reduce the gap between the second resistance line  14   b  and the first electrode  131  of the second light-emitting device  13   b  on a premise of ensuring the length of the second resistance line  14   b.  Therefore, the area of the first electrode  131  of the second light-emitting device  13   b  may increase to the greatest extent, and thus the aperture ratio of the second light-emitting device  13   b  may increase. 
     In some embodiments, the second resistance line  14   b  is adjacent to the first electrode  131  of the first light-emitting device  13   a.    
     The description that the second resistance line  14   b  is adjacent to the first electrode  131  of the first light-emitting device  13   a  means that, there are no other resistance lines  14  and no other first electrodes  131  between the second resistance line  14   b  and the first light-emitting device  13   a.  It may be possible to reduce the gap between the second resistance line  14   b  and the first electrode  131  of the first light-emitting device  13   a  on a premise of ensuring the sufficient length of the second resistance line  14 . In addition, depending on the above, the first resistance line  14   a  may also be coupled to the second power supply line  12   b.  In this case, the first resistance line  14   a  may bypass the first electrode  131  of the second light-emitting device  13   b  and is coupled to the first electrode  131  of the first light-emitting device  13   a,  so that the first resistance line  14   a  may not surround the first electrode  131  of the first light-emitting device  13   a  on a premise of ensuring the length of the first resistance line  14   a.  Therefore, the area occupied by the first electrode  131  of the first light-emitting device  13   a  may increase, and thus the aperture ratio of the first light-emitting device  13   a  may increase. 
     In some embodiments, as shown in  FIGS.  7  and  9   , the first light-emitting device  13   a  and the second light-emitting device  13   b  are located between the first power supply line  12   a  and the second power supply line  12   b.  The first power supply line  12   a,  the first light-emitting device  13   a,  the second light-emitting device  13   b  and the second power supply line  12   b  are sequentially arranged in the first direction. The first electrode  131  of the first light-emitting device  13   a  is coupled to the second power supply line  12   b  through the first resistance line  14   a,  the first electrode  131  of the second light-emitting device  13   b  is coupled to the first power supply line  12   a  through the second resistance line  14   b,  and the first resistance line  14   a  bypasses at least one edge L 2  of the first electrode  131  of the second light-emitting device  13   b  and is coupled to the first electrode  131  of the first light-emitting device  13   a.    
     In these embodiments, while the lengths of the first resistance line  14   a  and the second resistance line  14   b  are ensured, it may be possible to shorten the portion of the first resistance line  14   a  at the periphery of the first electrode  131  of the first light-emitting device  13   a  and the portion of the second resistance line  14   b  at the periphery of the first electrode  131  of the second light-emitting device  13   b.  It may be possible to increase areas of the first electrode  131  of the first light-emitting device  13   a  and the first electrode  131  of the second light-emitting device  13   b,  and thus increase the aperture ratios of the first light-emitting device  13   a  and the second light-emitting device  13   b  together. 
     In some embodiments, as shown in  FIGS.  7  and  9   , at least a part of the first resistance line  14   a  and at least a part of the second resistance line  14   b  are distributed on two opposite sides, arranged in the second direction, of a group of the first electrode of the first light-emitting device  13   a  and the first electrode of the second light-emitting device  13   b.    
     In these embodiments, while the lengths of the first resistance line  14   a  and the second resistance line  14   b  are ensured, the first resistance line  14   a  and the second resistance line  14   b  may be evenly distributed on the two opposite sides, arranged in the second direction, of the group of the first electrode of the first light-emitting device  13   a  and the first electrode of the second light-emitting device  13   b,  thereby improving the distribution uniformity of the first light-emitting device  13   a  and the second light-emitting device  13   b.    
     In some embodiments, as shown in  FIGS.  7  and  9   , an end E 1  of the first resistance line  14   a  coupled to the first electrode  131  of the first light-emitting device  13   a  extends to an edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the first power supply line  12   a,  and/or, an end E 2  of the second resistance line  14   b  coupled to the first electrode  131  of the second light-emitting device  13   b  extends to an edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the second power supply line  12   b.    
     In these embodiments,  FIGS.  7  and  9    each show a case that the end of the first resistance line  14   a  coupled to the first electrode  131  of the first light-emitting device  13   a  extends to a corner position of the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the first power supply line  12   a,  and the end of the second resistance line  14   b  coupled to the first electrode  131  of the second light-emitting device  13   b  extends to a corner position of the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the second power supply line  12   b.  It will be understood by those skilled in the art that, the end of the first resistance line  14   a  coupled to the first electrode  131  of the first light-emitting device  13   a  may extend to any position of the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the first power supply line  12   a,  and the end of the second resistance line  14   b  coupled to the first electrode  131  of the second light-emitting device  13   b  may extend to any position of the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the second power supply line  12   b.  On this basis, an orthographic projection of a portion of the first resistance line  14   a  extending to the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the first power supply line  12   a  on the substrate  11  may overlap with an orthographic projection of the first power supply line  12   a  on the substrate  11 , and an orthographic projection of a portion of the second resistance line  14   b  extending to the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the second power supply line  12   b  on the substrate  11  may overlap with an orthographic projection of the second power supply line  12   b  on the substrate  11 . As a result, the aperture ratio may not be affected. 
     In some other embodiments, as shown in  FIGS.  8  and  10   , the first power supply line  12   a  includes a first coupling portion S. The first light-emitting device  13   a  and the second light-emitting device  13   b  are arranged in the second direction. The first resistance line  14   a  includes a first resistance segment  141  and a second resistance segment  142  that are connected to each other. An end  1410  of the first resistance segment  141  away from a connection point P is coupled to the first coupling portion S, an end  1420  of the second resistance segment  142  away from the connection point P is coupled to the first electrode  131  of the first light-emitting device  13   a,  and the connection point P is a position where the first resistance segment  141  is connected to the second resistance segment  142 . The second resistance line  14   b  includes the first resistance segment  141  and a third resistance segment  143  that is connected to the connection point P, and an end  1430  of the third resistance segment  143  away from the connection point P is coupled to the first electrode  131  of the second light-emitting device  13   b.    
     In these embodiments, the first resistance line  14   a  and the second resistance line  14   b  share the first resistance segment  141 . It may also be possible to reduce the areas occupied by the first resistance line  14   a  and the second resistance line  14   b  on a premise of ensuring the sufficient lengths of the first resistance line  14   a  and the second resistance line  14   b,  thereby increasing the aperture ratio. 
     In some embodiments, as shown in  FIGS.  8  and  10   , there is an overlapped region between an orthographic projection of the first resistance segment  141  on the substrate  11  and the orthographic projection of the first power supply line  12   a  on the substrate  11 . In this way, the first resistance segment  141  may be partially or entirely located in a region where the first power supply line  12   a  is located, thereby further reducing the areas occupied by the first resistance line  14   a  and the second resistance line  14   b  and increasing the aperture ratio. 
     In some embodiments, as shown in  FIGS.  8  and  10   , the first electrode  131  of the first light-emitting device  13   a  and the first electrode  131  of the second light-emitting device  13   b  are arranged side by side, and the first electrode  131  of the second light-emitting device  13   b  is adjacent to the first resistance segment  141 . The second resistance segment  142  extends in the first direction (the direction shown by the arrow a in  FIG.  10   ), and the second resistance segment  142  is located on a side of the first light-emitting device  13   a  away from the second light-emitting device  13   b.  The third resistance segment  143  extends in the second direction (the direction shown by the arrow b in  FIG.  10   ), and the third resistance segment  143  is located between the first resistance segment  141  and the first light-emitting device  13   a.    
     In these embodiments, since the first resistance line  14   a  and the second resistance line  14   b  share the first resistance segment  141 , in order to make a resistance value of the first resistance line  14   a  and a resistance value of the second resistance line  14   b  substantially the same to ensure the luminance uniformity of the first light-emitting device  13   a  and the second light-emitting device  13   b,  materials, lengths and widths of the second resistance segment  142  and the third resistance segment  143  may be reasonably set, so that the resistance value of the second resistance segment  142  and the resistance value of the third resistance segment  143  may be substantially the same. 
     Here, in term of the design limit, in a case where the material of the first resistance line  14   a  is the same as the material of the second resistance line  14   b,  the length and the width of the second resistance segment  142  may be substantially the same as the length and the width of the third resistance segment  143 . In this case, if the lengths of two sides of the first light-emitting device  13   a  extending in the first direction and the second direction are the same, and the length of the third resistance segment  143  and the length of the second resistance segment  142  are both substantially the same as each of the lengths of two sides of the first light-emitting device  13   a  extending in the first direction and the second direction, the third resistance segment  143  is located between the first light-emitting device  13   a  and the first resistance segment  141 , which may slightly increase the dimension of the first electrode  131  of the second light-emitting device  13   b  in the first direction. In this way, the dimension of the first electrode  131  of the second light-emitting device  13   b  in the first direction may be greater than the dimension of the first electrode  131  of the first light-emitting device  13   a  in the first direction, so as to make full use of space and increase the light-emitting area. 
     In some embodiments, as shown in  FIGS.  8  and  10   , an end  1420  of the second resistance segment  142  coupled to the first electrode  131  of the first light-emitting device  13   a  extends to an edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the second power supply line  12   b,  and an end  1430  of the third resistance segment  143  coupled to the first electrode  131  of the second light-emitting device  13   b  extends to an edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a.    
     In these embodiments,  FIG.  10    shows a case that the end of the second resistance segment  142  coupled to the first electrode  131  of the first light-emitting device  13   a  extends to a corner position of the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the second power supply line  12   b,  and the end of the third resistance segment  143  coupled to the first electrode  131  of the second light-emitting device  13   b  extends to a corner position of the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a.  It will be understood by those skilled in the art that, the end of the second resistance segment  142  coupled to the first electrode  131  of the first light-emitting device  13   a  may extend to any position of the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the second power supply line  12   b,  and the end of the third resistance segment  143  coupled to the first electrode  131  of the second light-emitting device  13   b  may extend to any position of the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a.  In this case, an orthographic projection of a portion of the second resistance segment  142  extending to the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the second power supply line  12   b  on the substrate  11  may overlap with the orthographic projection of the second power supply line  12   b  on the substrate  11 , and an orthographic projection of a portion of the third resistance segment  143  extending to the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a  on the substrate  11  may overlap with the orthographic projection of the first power supply line  12   a  on the substrate  11 . As a result, the aperture ratio may not be affected. 
     As shown in  FIG.  10   , the end of the second resistance segment  142  coupled to the first electrode  131  of the first light-emitting device  13   a  extends to the corner position of the edge of the first electrode  131  of the first light-emitting device  13   a  proximate to the second power supply line  12   b,  and the end of the third resistance segment  143  coupled to the first electrode  131  of the second light-emitting device  13   b  extends to the corner position of the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a.  In a case where an orthographic projection of the third resistance segment  143  on the substrate  11  is located between the first power supply line  14   a  and the first electrode  131  of the first light-emitting device  13   a,  the dimension of the first electrode  131  of the second light-emitting device  13   b  in the first direction may slightly increase, so that the dimension of the first electrode  131  of the second light-emitting device  13   b  in the first direction may be greater than the dimension of the first electrode  131  of the first light-emitting device  13   a  in the first direction, thereby making full use of space and increasing the light-emitting area. 
     In some embodiments, as shown in  FIG.  11   , the plurality of openings K defined by the pixel defining layer  15  may include a first opening K 1  and a second opening K 2 . The first light-emitting device  13   a  is disposed in the first opening K 1 , the second light-emitting device  13   b  is disposed in the second opening K 2 , and a dimension of the second opening K 2  in the first direction is greater than a dimension of the first opening K 1  in the first direction. 
     In these embodiments, the pixel defining layer  15  defines the first opening K 1  and the second opening K 2 , so that it may be ensured that, in a case where the dimension of the first electrode  131  of the second light-emitting device  13   b  in the first direction is greater than the dimension of the first electrode  131  of the first light-emitting device  13   a  in the first direction, a light-emitting area of the second light-emitting device  13   b  in the first direction is greater than a light-emitting area of the first light-emitting device  13   a  in the first direction. 
     In some embodiments, as shown in  FIG.  12   , the plurality of light-emitting devices  13  further include a third light-emitting device  13   c  and a fourth light-emitting device  13   d.  The plurality of resistance lines  14  further include a third resistance line  14   c  and a fourth resistance line  14   d.  An end of the third resistance line  14   c  is coupled to the first coupling portion S, and another end E 3  of the third resistance line  14   c  is coupled to a first electrode  131  of the third light-emitting device  13   c.  An end of the fourth resistance line  14   d  is coupled to the first coupling portion S, and another end E 4  of the fourth resistance line  14   d  is coupled to a first electrode  131  of the fourth light-emitting device  13   d.  Passing through the first coupling portion S, a first straight line LL′ perpendicular to the first power supply line  12   a  is drawn on a plane where the substrate  11  is located. A structure of the first resistance line  14   a,  the second resistance line  14   b,  the third resistance line  14   c  and the fourth resistance line  14   d  is axisymmetric about the first straight line LL′, and/or, a structure of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the third light-emitting device  13   c  and the fourth light-emitting device  13   d  is axisymmetric about the first straight line LL′. 
     In these embodiments, the structure of the first resistance line  14   a,  the second resistance line  14   b,  the third resistance line  14   c  and the fourth resistance line  14   d  is axisymmetric about the first straight line LL′. In a case where the first resistance line  14   a  and the second resistance line  14   b  have substantially the same resistance value, the third resistance line  14   c  and the fourth resistance line  14   d  have substantially the same resistance value, and the distribution uniformity of the first resistance line  14   a,  the second resistance line  14   b,  the third resistance line  14   c  and the fourth resistance line  14   d  may be improved. Moreover, the structure of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the third light-emitting device  13   c  and the fourth light-emitting device  13   d  is axisymmetric about the first straight line LL′, so that in a case where the dimension of the second light-emitting device  13   b  in the first direction is greater than the dimension of the first light-emitting device  13   a  in the first direction, the dimension of the third light-emitting device  13   c  in the first direction is greater than the dimension of the fourth light-emitting device  13   d  in the first direction. As a result, the light-emitting areas of the light-emitting devices  13  may increase to the greatest extent. In addition, in a case where the orthogonal projection of the portion of the third resistance segment  143  extending to the edge of the first electrode  131  of the second light-emitting device  13   b  proximate to the first power supply line  12   a  on the substrate  11  overlaps with the orthogonal projection of the first power supply line  12   a  on the substrate  11 , it may also be possible to ensure the distribution uniformity of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the third light-emitting device  13   c  and the fourth light-emitting device  13   d,  and improve the luminance uniformity of the light-emitting devices  13 . 
     In some embodiments, as shown in Fla  12 , the second power supply line  12   b  includes a second coupling portion R. The plurality of light-emitting devices  13  further include a fifth light-emitting device  13   e  and a sixth light-emitting device  13   f,  and the plurality of resistance lines  14  further include a fifth resistance line  14   e  and a sixth resistance line  14   f.  An end of the fifth resistance line  14   e  is coupled to the second coupling portion R, and another end E 5  of the fifth resistance line  14   e  is coupled to a first electrode  131  of the fifth light-emitting device  13   e.  An end of the sixth resistance line  14   f  coupled to the second coupling portion R, and another end E 6  of the sixth resistance line  14   f  is coupled to a first electrode  131  of the sixth light-emitting device  13   f.  A second straight line MM′ parallel to both the first power supply line  12   a  and the second power supply line  12   b  and between the first light-emitting device  13   a  and the fifth light-emitting device  13   e  is drawn on the substrate  11 , a structure of the first resistance line  14   a,  the second resistance line  14   b,  the fifth resistance line  14   e  and the sixth resistance line  14   f  is axisymmetric about the second straight line MM′, and/or, a structure of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the fifth light-emitting device  13   e  and the sixth light-emitting device  13   f  is axisymmetric about the second straight line MM′. 
     In these embodiments, the structure of the first resistance line  14   a,  the second resistance line  14   b,  the fifth resistance line  14   e,  and the sixth resistance line  14   f  is axisymmetric about the second straight line MM′. In a case where the first resistance line  14   a  and the second resistance line  14   b  have substantially the same resistance value, the first resistance line  14   a,  the second resistance line  14   b,  the fifth resistance line  14   e  and the sixth resistance line  14   f  all have substantially the same resistance value. As a result, the luminance uniformity may be improved, and the distribution uniformity of the first resistance line  14   a,  the second resistance line  14   b,  the fifth resistance  14   e  and the sixth resistance line  141  may also be improved, which facilitates the formation of the patterns. Moreover, the structure of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the fifth light-emitting device  13   e  and the sixth light-emitting device  13   f  is axisymmetric about the second straight line MM′, so that it may also be possible to ensure the distribution uniformity of the first light-emitting device  13   a,  the second light-emitting device  13   b,  the fifth light-emitting device  13   e  and the sixth light-emitting device  13   f,  and improve the luminance uniformity. 
     In some embodiments, as shown in  FIG.  12   , the plurality of light-emitting devices  13  further include a seventh light-emitting device  13   g  and an eighth light-emitting device  13   h.  The plurality of resistance lines  14  further include a seventh resistance line  14   g  and an eighth resistance line  14   h.  An end of the seventh resistance line  14   g  is coupled to the second coupling portion R, and another end E 7  of the seventh resistance line  14   g  is coupled to a first electrode  131  of the seventh light-emitting device  13   g.  An end of the eighth resistance line  14   h  is coupled to the second coupling portion R, and another end E 8  of the eighth resistance line  14   h  is coupled to a first electrode  131  of the eighth light-emitting device  13   h.  Passing through the second coupling portion R, a third straight line NN′ perpendicular to the second power supply line  12   b  is drawn on the substrate  11 . A structure of the fifth resistance line  14   e,  the sixth resistance line  14   f,  the seventh resistance line  14   g  and the eighth resistance line  14   h  is axisymmetric about the third straight line NN′, and/or, a structure of the fifth light-emitting device  13   e,  the sixth light-emitting device  13   f,  the seventh light-emitting device  13   g  and the eighth light-emitting device  13   h  is axisymmetric about the third straight line NN′. 
     In these embodiments, the structure of the fifth resistance line  14   e,  the sixth resistance line  14   f,  the seventh resistance line  14   g  and the eighth resistance line  14   h  is axisymmetric about the third straight line NN′. In a case where the fifth resistance line  14   e,  the sixth resistance line  14   f,  the seventh resistance line  14   g  and the eighth resistance line  14   h  have substantially the same resistance value, it may be possible to improve the luminance uniformity of the fifth light-emitting device  13   e,  the sixth light-emitting device  13   f,  the seventh light-emitting device  13   g  and the eighth light-emitting device  13   e,  and improve the distribution uniformity of the fifth resistance line  14   e,  the sixth resistance line  14   f,  the seventh resistance line  14   g  and the eighth resistance line  14   h,  which facilitates the formation of the patterns. Moreover, the structure of the fifth light-emitting device  13   e,  the sixth light-emitting device  13   f,  the seventh light-emitting device  13   g  and the eighth light-emitting device  13   h  is axisymmetric about the third straight line NN′, so that it may also be possible to ensure the distribution uniformity of the fifth light-emitting device  13   e,  the sixth light-emitting device  13   f,  the seventh light-emitting device  13   g  and the eighth light-emitting device  13   h,  and improve the luminance uniformity. 
     In some embodiments, as shown in  FIG.  12   , the plurality of power supply lines  12  further include a third power supply line  12   c.  The third power supply line  12   c  is parallel to the first power supply line  12   a,  and the third power supply line  12   c  is located on a side of the second power supply line  12   b  away from the first power supply line  12   a  and is adjacent to the second power supply line  12   b.  A fourth straight line CC′ parallel to the first power supply line  12   a  and passing through the second coupling portion R is drawn on the substrate  11 . The structure of all resistance lines  14  coupled to the second power supply line  12   b  is axisymmetric about the fourth straight line CC′, and/or, the structure of all light-emitting devices  13  coupled to the second power supply line  12   b  is axisymmetric about the fourth straight line CC′. 
     In these embodiments, the structure of all the resistance lines  14  coupled to the second power supply line  12   b  is axisymmetric about the fourth straight line CC′, so that it may also be possible to increase the distribution uniformity of all the resistance lines  14  coupled to the second power supply line  12   b,  and facilitate the manufacturing. In addition, in a case where the fifth resistance line  14   e,  the sixth resistance line  14   f,  the seventh resistance line  14   g  and the eighth resistance line  14   h  are all coupled to the second coupling portion R, eight resistance lines  14  distributed on two opposite sides of the second power supply line  12   b  may be coupled to the second coupling portion R. In this case, the eight resistance lines  14  may be coupled to the second coupling portion R through a single via hole O, and four resistance lines  14  in the eight resistance lines  14  distributed on the two opposite sides of the second power supply line  12   b  may share a same resistance segment. As shown in  FIG.  12   , the fifth resistance line  14   e,  the sixth resistance line  14   f,  a ninth resistance line  14   i  and a tenth resistance line  14   j  distributed on the two opposite sides of the second power supply line  12   b  share the same resistance segment  144 . In this way, it is possible to further reduce the area occupied by the resistance lines  14 , improve the distribution uniformity and regularity of the resistance lines  14 , and facilitate manufacturing. The structure of all the light-emitting devices  13  coupled to the second power supply line  12   b  is axisymmetric about the fourth straight line CC′, so that it may also be possible to ensure the distribution uniformity of the light-emitting devices  13  coupled to the second power supply line  12   b,  and improve the luminance uniformity. 
     In some embodiments, as shown in  FIG.  13   , the plurality of via holes O in the insulating layer  10  include a first via hole O 1  corresponding to a position of the first coupling portion S and a second via hole O 2  corresponding to a position of the second coupling portion R, and a size of the second via hole O 2  is substantially equal to a size of the first via hole O 1 . 
     In these embodiments, in conjunction with  FIGS.  12  and  13   , in a case where a structure of the first resistance segment  141  and the resistance segment  144  is axisymmetric about the second straight line WA, the resistance value of the first resistance segment  141  and the resistance value of the resistance segment  144  are substantially the same. Therefore, the size of the first via hole O 1  is made substantially equal to the size of the second via hole O 2 , so that it may be possible to make a contact resistance between the first resistance segment  141  and the first coupling portion S substantially equal to a contact resistance between the resistance segment  144  and the second coupling portion R. As a result, it may be possible to ensure that currents provided for light-emitting devices  13  (e.g., all light-emitting devices  13  coupled the first power supply line  12   a  and all light-emitting devices  13  coupled to the second power supply line  12   b ) are substantially equal, thereby further improving the luminance uniformity. 
     Some embodiments of the present disclosure provide a method of manufacturing a light-emitting substrate, As shown in  FIG.  2   , the method includes the following steps. 
     A plurality of power supply lines  12 , a plurality of light-emitting devices  13  and a plurality of resistance lines  14  are formed on the substrate  11 . Each light-emitting device  13  includes a first electrode  131  and a second electrode  132  that are disposed sequentially, and a light-emitting functional layer  132  disposed between the first electrode  131  and the second electrode  132 . The first electrode  131  is closer to the substrate  11  than the second electrode  132 . An end of each resistance line  14  is coupled to a power supply line  12 , and another end of each resistance line  14  is coupled to a first electrode  131  of a light-emitting device  13 , and each resistance line  14  is located in a same layer as the first electrode  131  coupled thereto. 
     Beneficial effects of the method of manufacturing the light-emitting substrate provided by the embodiments of the present disclosure are the same as beneficial effects of the light-emitting substrate provided by the embodiments of the present disclosure, and details will not be repeated herein. 
     In some embodiments, the step of forming the first electrode  131  of each light-emitting device  13  in the plurality of light-emitting devices  13  and the step of forming the plurality of resistance lines  14  include: forming a conductive film, and patterning the conductive film to form a conductive pattern layer. The conductive pattern layer includes the first electrode  131  of each light-emitting device  13  in the plurality of light-emitting devices  13  and the plurality of resistance lines  14 . That is, the first electrode  131  of each light-emitting device  13  in the plurality of light-emitting devices  13  and the plurality of resistance lines  14  are formed through a same patterning process. 
     It can be seen from that the light-emitting substrate  1  may further include the insulating layer  10  disposed between the plurality of power supply lines  12  and the first electrodes  131 , as shown in  FIG.  14   , after S 11  in which the plurality of power supply lines  12  are formed, and before S 12  in which the first electrodes  131  are formed, the method further includes the following step. 
     In S 13 , a plurality of via holes O are formed in the insulating layer  10  on the substrate. 
     In this way, when the plurality of resistance lines  14  are formed, each resistance line  14  may be coupled to a power supply line  12  through a via hole O in the insulating layer  10 . 
     In some embodiments, in a case where the light-emitting substrate  1  further includes a pixel defining layer  15 , as shown in  FIG.  14   , the method further includes S 14  after the first electrodes  131  are formed in S 12  and before the light-emitting functional layer is formed, where in S 14  the pixel defining layer  15  is formed. The pixel defining layer  15  defines a plurality of openings K, When the light-emitting functional layer is subsequently formed, the light-emitting functional layer of each light-emitting device  13  may be formed in an opening K. 
     The foregoing descriptions are merely specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements that a person skilled in the art could conceive of within the technical scope of the present disclosure shall be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.