Display substrate, preparation method thereof, and display device

Abstract

The present invention discloses a display substrate, a manufacturing method thereof, and a display device. The display substrate includes: a substrate, a light-emitting structure, and a light-emitting region defining layer disposed on one side of the substrate. The light-emitting structure includes an anode layer, a light-emitting layer, and a cathode layer stacked in sequence. The substrate has a plurality of sub-pixel regions distributed in an array. The anode layer includes anode units corresponding to the plurality of sub-pixel regions one by one. The light-emitting region defining layer includes a first defining structure, and adjacent anode units are spaced apart by the first defining structure. The anode unit includes a conductive connection portion and a main body portion connected to the conductive connection portion. The main body portion includes a main trunk portion and at least two branch trunk portions connected to the main trunk portion, and adjacent branch trunk portions are spaced apart. Through further modular design of each sub-pixel, when a short caused by a foreign object results in a dark spot defect, only a very small part of the sub-pixel needs to be cut off, which can slow down the aging speed of the light-emitting layer and effectively improve the service life of the product.

Description

Technical Field

[0001] The present invention generally relates to the field of display technology, and in particular to a display substrate and a preparation method thereof, and a display device. Background Art

[0002] Transparent display products are widely used in on-board displays in cars / subways and window displays in hotels / clothing stores, etc. They have significant advantages such as clear picture quality and realistic display effects.

[0003] At present, transparent display products use the vapor deposition top emission EL device structure + reflective anode + transparent cathode technology. The tiny foreign matter (particles) brought by the reflective anode, EL device or cathode will cause a short circuit between the cathode and the anode, thus causing dark spots. Figure 1 At present, in order to solve the problem of dark spots, most sub-pixels (R, G, B, W) are divided into two parts, A and B. For example, when there is a short caused by foreign matter in part A, which causes a dark spot, part A will be cut to ensure that part B can emit light normally, such as cutting at the position indicated by the dotted line C. However, after this design and cutting repair, the brightness originally achieved by parts A and B needs to be achieved by part B, which will inevitably require a larger current drive, which will greatly accelerate the EL aging of part B, which is very unfavorable to the life of the product. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a display substrate and a method for manufacturing the same, and a display device.

[0005] In a first aspect, the present invention provides a display substrate, comprising: a base substrate, and a light-emitting structure and a light-emitting region defining layer arranged on one side of the base substrate, wherein the light-emitting structure comprises an anode layer, a light-emitting layer and a cathode layer arranged in a stacked manner, and the anode layer is closer to the base substrate than the cathode layer;

[0006] The base substrate has a plurality of sub-pixel regions distributed in an array, the anode layer includes anode units corresponding to the plurality of sub-pixel regions one by one, the light-emitting region defining layer includes a first defining structure, and adjacent anode units are spaced apart by the first defining structure;

[0007] The anode unit includes a conductive connection portion and a main body portion, wherein the main body portion includes a main body portion connected to the conductive connection portion and at least two branch bodies connected to the main body portion, and adjacent branch bodies are arranged at intervals.

[0008] In some examples, in the main body portion, there is a first opening between the main trunk portion and the branch trunk portions and between adjacent branch trunk portions. In a direction perpendicular to the substrate, the longitudinal cross-section of the first opening is rectangular or trapezoidal in an inverted shape;

[0009] The light-emitting layer covers the side walls and the bottom of the first opening.

[0010] In some examples, in the main body portion, there is a first opening between the main trunk portion and the branch trunk portions and between adjacent branch trunk portions. In a direction perpendicular to the substrate, the longitudinal cross-section of the first opening is in the shape of a Chinese character'middle'. The light-emitting region defining layer further includes a second defining structure disposed at the first opening.

[0011] Furthermore, the second defining structure and the first defining structure are provided on the same layer and made of the same material.

[0012] In some examples, the orthographic projection of the main trunk portion on the substrate is annular, the orthographic projection of the branch trunk portion on the substrate is T-shaped, the branch trunk portion is located inside the main trunk portion, and the conductive connection portion is located outside the main trunk portion.

[0013] In some examples, in each anode unit, the conductive connection portion connects at least two spaced-apart main body portions, and adjacent main body portions are spaced apart by the first defining structure.

[0014] In a second aspect, the present invention provides a display device including the above display substrate.

[0015] In a third aspect, the present invention provides a method for manufacturing a display substrate, including:

[0016] Providing a substrate having a display area and a non-display area surrounding the display area, the display area including a plurality of sub-pixel areas arranged in an array;

[0017] Forming a light-emitting structure and a light-emitting region defining layer on one side of the substrate. The light-emitting structure includes an anode layer, a light-emitting layer, and a cathode layer stacked. The anode layer is closer to the substrate than the cathode layer. The anode layer includes anode units corresponding to the plurality of sub-pixel areas one by one. The light-emitting region defining layer includes a first defining structure, and adjacent anode units are spaced apart by the first defining structure;

[0018] Wherein, the anode unit includes a conductive connection portion and a main body portion. The main body portion includes a main trunk portion connected to the conductive connection portion and at least two branch trunk portions connected to the main trunk portion, and adjacent branch trunk portions are spaced apart.

[0019] In some examples, the method of forming the anode layer includes:

[0020] Form a reflective film layer on the side of the first transparent layer away from the substrate, etch the reflective film layer to form a first reflective structure layer, and the first reflective structure layer has second sub-openings corresponding one-to-one to the plurality of first sub-openings;

[0021] Form a transparent film layer on the side of the first reflective structure layer away from the substrate, etch the transparent film layer to form a first transparent structure layer, and the first transparent structure layer has third sub-openings corresponding one-to-one to the plurality of first sub-openings;

[0022] Use a single etching process on the first reflective structure layer and the first transparent structure layer to form a second transparent layer and a reflective electrode layer;

[0023] The orthographic projection of the first sub-opening on the substrate falls within the orthographic projection of the second sub-opening on the substrate, and the orthographic projection of the second sub-opening on the substrate falls within the orthographic projection of the third sub-opening on the substrate;

[0024] Wherein, the anode layer has an opening portion, the opening portion penetrates the first transparent layer, the reflective electrode layer and the second transparent layer in a direction perpendicular to the substrate, the opening portion includes a plurality of first openings and a plurality of second openings, each first opening includes the first sub-opening, the second sub-opening and the third sub-opening correspondingly arranged in a direction perpendicular to the substrate, the anode layer separates a plurality of anode units through the second openings, and the anode units separate the main trunk portion and a plurality of branch trunk portions through the first openings; in a direction perpendicular to the substrate, the longitudinal section of the first opening is rectangular or trapezoidal inverted.

[0025] In some examples, the method of forming the anode layer includes:

[0026] Form a first transparent layer on one side of the substrate;

[0027] Form a reflective film layer and a transparent film layer in sequence on the side of the first transparent layer away from the substrate;

[0028] Use a single etching process on the transparent film layer and the reflective film layer to form a second transparent layer and a reflective electrode layer;

[0029] Among them, the anode layer has an opening, and the opening penetrates through the first transparent layer, the reflective electrode layer, and the second transparent layer in a direction perpendicular to the substrate. The opening includes a plurality of first openings and a plurality of second openings. The anode layer forms a plurality of anode units through the second openings, and the main part and a plurality of branch parts are separated by the first openings in the anode units; in a direction perpendicular to the substrate, the longitudinal cross-section of the first opening is in the shape of a Chinese character 'zhong'.

[0030] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0031] In the above solution, the anode unit corresponding to each sub-pixel includes a conductive connection part and a main body part connected to the conductive connection part. The main body part includes a main part and at least two branch parts connected to the main part. The adjacent branch parts are spaced apart. That is, by further modular design of each sub-pixel, when a short caused by a foreign object results in a dark spot defect, only a very small part of the sub-pixel needs to be cut off to ensure that the other parts of the sub-pixel emit light normally, thereby greatly slowing down the aging speed of the light-emitting layer and effectively improving the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0033] Figure 1 It is a top view structural schematic diagram of a sub-pixel in the prior art;

[0034] Figure 2 It is a top view structural schematic diagram of a sub-pixel provided by an embodiment of the present invention;

[0035] Figure 3 It is a side view structural schematic diagram of a display substrate provided by an embodiment of the present invention;

[0036] Figures 4a to 4e It is a structural flowchart of manufacturing a display substrate provided by an embodiment of the present invention;

[0037] Figure 5 It is a side view structural schematic diagram of a display substrate provided by another embodiment of the present invention;

[0038] Figures 6a to 6e It is a structural flowchart of manufacturing a display substrate provided by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0040] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

[0041] Figure 2 It is a top view structural schematic diagram of a sub-pixel provided by an embodiment of the present invention, specifically illustrated by the structure of the anode unit corresponding to the sub-pixel; Figure 3 It is a side view structural schematic diagram of a display substrate provided by an embodiment of the present invention.

[0042] As Figure 3 shown, a display substrate provided by an embodiment of the present invention includes: a substrate substrate 11, and a light-emitting structure and a light-emitting region defining layer provided on one side of the substrate substrate 11. The light-emitting structure includes an anode layer 21, a light-emitting layer 22, and a cathode layer 23 which are stacked, and the anode layer 21 is closer to the substrate substrate 11 than the cathode layer 23;

[0043] The substrate substrate 11 has a plurality of sub-pixel regions distributed in an array. The anode layer 21 includes anode units corresponding to the plurality of sub-pixel regions one by one. The light-emitting region defining layer includes a first defining structure 24, and adjacent anode units are spaced apart by the first defining structure 24;

[0044] Referring to Figure 2 , the anode unit includes a conductive connection portion 41 and a main body portion 42. The main body portion 42 includes a main trunk portion 421 connected to the conductive connection portion 41 and at least two branch trunk portions 422 connected to the main trunk portion 421, and adjacent branch trunk portions 422 are spaced apart.

[0045] In this example, the substrate substrate 11 has a display area and a non-display area surrounding the display area. The display area and the non-display area, as well as between the respective sub-pixel regions in the display area, are spaced apart by the first defining structure 24;

[0046] Each sub-pixel region corresponds to an anode unit. The anode unit includes a conductive connection part 41 and a main body part 42 which are connected. The conductive connection part 41 is used for electrically connecting with other layer structures (such as the drain). Among the main body parts 42, a plurality of branch parts 422 connected to the main trunk part 421 are arranged at intervals. When there is a short caused by foreign matter locally resulting in a dark spot defect, darkening treatment can be performed by cutting on a certain branch part. After the cutting treatment, the independent branch part no longer emits light, and other areas are not affected and return to normal light emission, which can effectively alleviate the problem of accelerated aging of the light-emitting layer, thereby minimizing the impact of dark spot defects caused by foreign matter and greatly improving the service life of the display product.

[0047] For example, Figure 3 the first defining structure 24 shown in Figure 3 separates the display area and the non-display area, and Figure 3 the left side of the first defining structure 24 shown in

[0048] is the display area, and the right side of the first defining structure 24 is the non-display area; it can be understood that there are also a plurality of first defining structures in the display area, which divide the display area into a plurality of sub-pixel regions. The plurality of first defining structures in the display area are not shown in

[0049] a light-shielding layer 12, arranged on one side of the substrate 11, and the light-shielding layer 12 is a conductive metal;

[0050] a buffer layer 13, arranged on the surface of the light-shielding layer 12 away from the substrate 11 and covering the light-shielding layer 12;

[0051] an active layer 14, arranged on the surface of the buffer layer 13 away from the substrate 11;

[0052] a gate insulating layer 15, arranged on the surface of the active layer 14 away from the substrate 11;

[0053] a gate 16, arranged on the surface of the gate insulating layer 15 away from the substrate 11;

[0054] an interlayer dielectric layer 17, arranged on the side of the gate 16 away from the substrate 11, covering the exposed surface of the buffer layer 13, the exposed surface of the active layer 14, the exposed surface of the gate insulating layer 15, and the surface of the gate 16;

[0055] a source-drain metal layer, including a source electrode 141 and a drain electrode 142. The source electrode 141 and the drain electrode 142 are arranged on the surface of the interlayer dielectric layer 17 away from the substrate 11. Among them, the source electrode 141 and the drain electrode 142 are respectively electrically connected to the active layer 14 through vias penetrating the interlayer insulating layer 17, and the drain electrode 142 can also be electrically connected to the light-shielding layer 13;

[0056] A conductive structure 18, such as an auxiliary cathode, is disposed on the surface of the interlayer dielectric layer 17 away from the substrate 11. In the manufacturing process, the conductive structure 18 can be prepared together with the source electrode 141 and the drain electrode 142 through the same process step.

[0057] A passivation layer 19 is disposed on one side of the source-drain metal layer away from the substrate 11 and covers the surface of the conductive structure 18 and the exposed interlayer dielectric layer 17.

[0058] A planarization layer 20 is disposed on the surface of the passivation layer 19 away from the substrate 11.

[0059] Among them, there are no special requirements for the specific materials of the above-mentioned various structures, and those skilled in the art can flexibly select according to the actual situation.

[0060] Exemplarily, the specific type of the substrate 11 can be a glass substrate, a polymer substrate or a metal substrate; the specific materials of the buffer layer 13, the gate insulating layer 15 and the interlayer dielectric layer 17 include but are not limited to at least one of silicon nitride, silicon oxide, silicon oxynitride and organic insulating materials; the specific materials of the light-shielding layer 12, the source electrode 141, the drain electrode 142 and the conductive structure 18 include but are not limited to metal materials such as copper, aluminum, silver, molybdenum, neodymium or alloys of the above metal materials; the specific material of the active layer 14 includes but is not limited to materials such as polysilicon, amorphous silicon, IGZO or IZTO; the specific materials of the passivation layer 19 include but are not limited to at least one of silicon oxide, silicon nitride and silicon oxynitride; the planarization layer 20 can include an inorganic planarization layer and an organic planarization layer, wherein the inorganic planarization layer is disposed on the side close to the substrate, the organic planarization layer is disposed on the side close to the anode layer 21, and the specific materials of the inorganic planarization layer include but are not limited to at least one of silicon nitride, silicon oxide and silicon oxynitride, and the material of the organic planarization layer is an organic insulating material.

[0061] Referring to Figure 3 , a light-emitting structure is disposed on the surface of the planarization layer 20. Among them, the anode layer 21 is electrically connected to the drain electrode 142 through a first via hole penetrating the planarization layer 20 so as to realize the driving of the light-emitting structure by the thin-film transistor; Exemplarily, the anode layer 21 includes a first transparent layer 211, a reflective electrode layer 212 and a second transparent layer 213 which are stacked, and the second transparent layer 213 is farther away from the substrate 11 than the first transparent layer 211.

[0062] Referring to Figure 3, an isolation structure 30 is further provided in the non-display area. The isolation structure 30 is electrically connected to the conductive structure 12 through a second via hole passing through the planarization layer 20. The isolation structure 30 includes a first layer 301, an intermediate layer 302, and a second layer 303 stacked. The second layer 303 is farther from the substrate 11 than the first layer 301. The thickness of the intermediate layer 302 is greater than the thickness of the reflective electrode layer 212. The first layer 301 is on the same layer and made of the same material as the first transparent layer 211, and the thickness of the first layer 301 is the same as that of the first transparent layer 211. The second layer 303 is on the same layer and made of the same material as the second transparent layer 213, and the thickness of the second layer 303 is the same as that of the second transparent layer 213.

[0063] In the direction perpendicular to the substrate 11, the thickness of the isolation structure 30 is greater than the thickness of the anode layer 21, and the isolation structure is in an "I" shape. In this way, the light-emitting layer 22 can be effectively cut off, so that the cathode layer 23 is in contact and electrically connected to the isolation structure 30, so as to achieve a smooth connection between the cathode layer 23 and the conductive structure 18. Since the conductive structure has strong conductivity, it can solve the IR drop problem of the cathode layer. The thickness of the reflective electrode layer 212 is relatively thin, which can reduce the stress of the reflective electrode layer 212, thereby reducing the stress difference between the anode layer 21 and the underlying planarization layer 20, avoiding problems such as bulging or peeling of the reflective electrode layer 212, and improving the display effect and product yield of the display product.

[0064] In some exemplary embodiments, in the main body 41, there is a first opening between the main trunk 421 and the branch trunks 422 and between adjacent branch trunks 422. In the direction perpendicular to the substrate 11, the longitudinal cross-section of the first opening is in a Chinese character "zhong" shape. The light-emitting area defining layer further includes a second defining structure 25 provided at the first opening.

[0065] In this embodiment, the anode unit is further divided into multiple modules by the second defining structure 25, the main trunk 421, and the branch trunks 422. Each branch trunk 422 corresponds to a module area, and the respective sub-pixels are correspondingly further modularized. When foreign matter falls on a certain branch trunk and causes anode short, resulting in a dark spot defect, darkening treatment can be performed by cutting a certain branch trunk.

[0066] Further, the second defining structure 25 and the first defining structure 24 are on the same layer and made of the same material. That is, the second defining structure 25 and the first defining structure 24 are obtained through the same manufacturing step, so their thicknesses are also the same. This can reduce the complexity of the process and facilitate the preparation of the display substrate.

[0067] In some exemplary embodiments, the orthographic projection of the main trunk portion 421 on the substrate 11 is annular, the orthographic projection of the branch trunk portion 422 on the substrate 11 is T-shaped, the branch trunk portion 422 is located inside the main trunk portion 421, and the conductive connection portion 41 is located outside the main trunk portion 421. Of course, the shape of the orthographic projection of the main trunk portion 421 on the substrate 11 includes, but is not limited to, an annular shape. For example, the orthographic projection of the main trunk portion 421 on the substrate 11 may also be in the form of a strip (such as a straight strip or a curved strip).

[0068] Since the size of the sub-pixel region is extremely small, compared with the main trunk portion in the form of a strip, the annular main trunk portion 421 in this embodiment can make better use of the space of the sub-pixel region, so that as many main body portions 42 connected to the conductive connection portion 41 as possible are provided in the anode unit. A relatively large number of branch trunk portions 422 are connected inside each main trunk portion 421, and the branch trunk portions 422 are spaced from each other. Thus, the anode unit corresponding to each sub-pixel region is further subdivided into more modules by the main trunk portion 421 and the branch trunk portions 422. When a foreign object causes a defect, a certain branch trunk portion 422 is cut and darkened. The cut part no longer emits light, while the other parts are not affected by the cut part and resume normal light emission. Due to local cutting, the aging speed of the light-emitting layer is effectively slowed down, thereby solving the adverse effects brought by the repair of dark spots and greatly improving the service life and display effect of the display product.

[0069] In some exemplary embodiments, in each anode unit, the conductive connection portion 41 is connected to at least two spaced-apart main body portions 42, and the adjacent main body portions 42 are spaced apart by a first defining structure 24.

[0070] Since the orthographic projection of the main trunk portion 421 on the substrate 11 is annular, each anode unit may include at least two spaced-apart main body portions 42, and the sub-pixel regions are spaced out by the first defining structure 24.

[0071] Refer to Figure 2 , each anode unit includes two spaced-apart main body portions 42, and four branch trunk portions 422 are connected to the inside of the main trunk portion 421 of each main body portion 42. When a certain branch trunk portion causes a dark spot due to a short circuit, the branch trunk portion can be locally cut to relieve the problem of accelerated aging of the light-emitting layer of the remaining part.

[0072] Next, a method for manufacturing the above display substrate (i.e., Figure 3 the exemplary display substrate) is introduced. The method for manufacturing the display substrate includes:

[0073] Providing a substrate 11, the substrate 11 having a display area and a non-display area surrounding the display area, and the display area including a plurality of sub-pixel regions distributed in an array;

[0074] A light-emitting structure and a light-emitting region defining layer are formed on one side of a substrate 11. The light-emitting structure includes an anode layer 21, a light-emitting layer 22, and a cathode layer 23 which are stacked. The anode layer 21 is closer to the substrate 11 than the cathode layer 23. The anode layer 21 includes anode units corresponding to a plurality of sub-pixel regions one by one. The light-emitting region defining layer includes a first defining structure 24, and adjacent anode units are spaced apart by the first defining structure;

[0075] Wherein, the anode unit includes a conductive connection portion 41 and a main body portion 42 connected to the conductive connection portion 41. The main body portion 42 includes a main trunk portion 421 and at least two branch trunk portions 422 connected to the main trunk portion 421, and adjacent branch trunk portions 422 are spaced apart.

[0076] Referring to Figure 3 , a light-shielding layer 12, a buffer layer 13, an active layer 14, a gate insulating layer 15, a gate electrode 16, an interlayer dielectric layer 17, a source-drain electrode layer, a passivation layer 19, and a planarization layer 20 are sequentially stacked on one side of the substrate 11. The display substrate further includes a conductive structure 18, and the conductive structure 18 is disposed on the surface of the interlayer dielectric layer 17 away from the substrate 11. The conductive structure 18 can be prepared by the same process as the source-drain electrode layer; the source-drain electrode layer includes a source electrode 141 and a drain electrode 142. The source electrode 141 and the drain electrode 142 are respectively electrically connected to the active layer 14 through vias penetrating the interlayer dielectric layer, and the drain electrode 142 can also be electrically connected to the light-shielding layer 13.

[0077] In some exemplary embodiments, referring to Figures 4a to 4e , the method of forming the anode layer 21 includes:

[0078] Referring to Figure 4a , a first transparent layer 211 is formed on one side of the substrate 11. The first transparent layer 211 is located in the display area, and at the same time, a first layer 301 is formed in the non-display area. The first layer 301 is on the same layer as the first transparent layer 211 and is spaced apart;

[0079] Referring to Figure 4c , a reflective film layer 312 is formed on the side of the first transparent layer 211 away from the substrate 11;

[0080] Referring to Figure 4c , a transparent film layer 32 is formed on the side of the reflective film layer 312 away from the substrate 11;

[0081] Referring to Figure 4e , a single etching process is used for the transparent film layer 32 and the reflective film layer 312 to form a second transparent layer 213 and a reflective electrode layer 212, and at the same time, an intermediate layer 302 and a second layer 303 are formed in the non-display area;

[0082] Among them, before forming the reflective film layer 312, a full-surface reflective layer is formed on the first transparent layer 211, and the reflective layer is etched to remove the first region of the reflective layer. The orthographic projection of the first region on the substrate 11 is substantially the same as the orthographic projection of the anode layer on the substrate, forming the enhanced reflective layer 311. Refer to Figure 4b , which facilitates that the thickness of the second layer of the subsequent formed isolation structure is greater than the thickness of the reflective electrode layer in the anode layer;

[0083] The anode layer 21 has openings. The openings penetrate the first transparent layer, the reflective electrode layer, and the second transparent layer in the direction perpendicular to the substrate. The openings include a plurality of first openings 26 and a plurality of second openings 27. The anode layer separates a plurality of anode units through the second openings 27, and the anode units separate a main portion 421 and a plurality of branch portions 422 through the first openings 26; in the direction perpendicular to the substrate 11, the longitudinal section of the first opening 26 is in a Chinese character 'zhong' shape, and similarly, the longitudinal section of the second opening 27 is also in a Chinese character 'zhong' shape.

[0084] Adopting a single etching process for the transparent film layer 32 and the reflective film layer 312 is carried out by the same etching solution. Since the etching rates of the etching solution for the transparent film layer 32 and the reflective film layer 312 are different, that is, the etching rate for the reflective film layer 312 is faster, and the etching rate for the transparent film layer 32 is relatively slower. Therefore, the obtained isolation structure is in a 'gong' - shaped structure, that is, the orthographic projection of the middle layer on the substrate is located inside the orthographic projection of the first layer on the substrate and is located inside the orthographic projection of the second layer on the substrate. The area of the middle layer is smaller than the area of the first layer and smaller than the area of the second layer, so that the formed isolation structure 30 can well cut off the light - emitting layer.

[0085] As Figure 5 shown, another embodiment of the present invention provides a display substrate. Combining Figure 2 , in the main body portion 42 of the display substrate, there are first openings 26 between the main portion 421 and the branch portions 422 and between adjacent branch portions 422. In the direction perpendicular to the substrate 11, the longitudinal section of the first opening 27 is in a rectangular or inverted trapezoidal shape; the light - emitting layer 22 covers the side walls and the bottom of the first opening 26.

[0086] Different from the previous embodiment, in this embodiment, no second defining structure is provided at the first opening 26, and the light - emitting layer 22 is disposed along the side walls and the bottom of the first opening 26 at the first opening 26.

[0087] The sub-pixels corresponding to the anodic unit designed in this way are further divided into multiple modules according to the settings of the trunk parts. When a foreign object lands on a certain trunk part, causing anodic short and resulting in a dark spot defect, darkening treatment can be performed by cutting a certain trunk part, thereby solving the problem of accelerated aging of the light-emitting layer and effectively improving the lifespan and display effect of the display product.

[0088] Next, a method for manufacturing the display substrate (i.e., Figure 5 the exemplary display substrate) provided in this embodiment will be introduced. The method for manufacturing the display substrate includes:

[0089] Providing a substrate 11, the substrate 11 having a display area and a non-display area surrounding the display area, the display area including a plurality of sub-pixel areas distributed in an array;

[0090] Forming a light-emitting structure and a light-emitting area defining layer on one side of the substrate 11. The light-emitting structure includes an anodic layer 21, a light-emitting layer 22, and a cathodic layer 23 stacked. The anodic layer 21 is closer to the substrate 11 than the cathodic layer 23. The anodic layer 21 includes anodic units corresponding one-to-one to the plurality of sub-pixel areas. The light-emitting area defining layer includes a first defining structure 24, and adjacent anodic units are spaced apart by the first defining structure;

[0091] Wherein, the anodic unit includes a conductive connection part 41 and a main body part 42 connected to the conductive connection part 41. The main body part 42 includes a main trunk part 421 and at least two branch trunk parts 422 connected to the main trunk part 421, and adjacent branch trunk parts 422 are spaced apart.

[0092] In some exemplary embodiments, referring to Figures 6a to 6e , the method for forming the anodic layer includes:

[0093] Referring to FIG. 6a, forming a first transparent layer 211 on one side of the display area of the substrate 11. The first transparent layer 211 has a plurality of first sub-openings 261. At the same time, forming a first layer 301 in the non-display area. The first layer 301 is on the same layer as the first transparent layer 211 and is spaced apart;

[0094] Referring to FIG. 6c, forming a reflective film layer on the side of the first transparent layer 211 away from the substrate 11, etching the reflective film layer to form a first reflective structure layer 312. The first reflective structure layer 312 has second sub-openings 262 corresponding one-to-one to the plurality of first sub-openings 261;

[0095] Referring to FIG. 6d, forming a transparent film layer on the side of the first reflective structure layer 312 away from the substrate 11, etching the transparent film layer to form a first transparent structure layer 32. The first transparent structure layer 32 has third sub-openings 263 corresponding one-to-one to the plurality of first sub-openings 261;

[0096] An etching process is used for the first reflective structure layer 312 and the first transparent structure layer 32 to form the second transparent layer 213 and the reflective electrode layer 212. Meanwhile, the intermediate layer 302 and the second layer 303 are formed in the non-display area.

[0097] The orthographic projection of the first sub-opening 261 on the substrate 11 falls within the orthographic projection of the second sub-opening 262 on the substrate 11, and the orthographic projection of the second sub-opening 262 on the substrate falls within the orthographic projection of the third sub-opening 263 on the substrate 11.

[0098] Among them, before forming the first reflective structure layer 312, a whole-surface reflective layer is formed on the first transparent layer 211, and the reflective layer is etched to remove the first region. The orthographic projection of the first region on the substrate 11 is substantially the same as the orthographic projection of the anode layer on the substrate, forming the enhanced reflective layer 311. Refer to Figure 4b , so that the thickness of the second layer of the isolation structure formed subsequently is greater than the thickness of the reflective electrode layer in the anode layer.

[0099] The anode layer 21 has an opening. The opening penetrates the first transparent layer, the reflective electrode layer, and the second transparent layer in the direction perpendicular to the substrate. The opening includes a plurality of first openings 26 and a plurality of second openings 27. Each first opening includes a first sub-opening, a second sub-opening, and a third sub-opening correspondingly arranged on the substrate perpendicular to the substrate. The anode layer separates a plurality of anode units through the second openings, and the anode units separate the main part and a plurality of branch parts through the first openings. In the direction perpendicular to the substrate, the longitudinal section of the first opening is rectangular or trapezoidal in reverse, and the longitudinal section of the second opening is in the shape of a Chinese character'middle'.

[0100] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0101] The present invention uses first, second, etc. to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information can also be called the second information, and similarly, the second information can also be called the first information.

[0102] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0103] The above description is only the preferred embodiment of the present invention and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in the present invention.

Claims

1. A display substrate, characterized in that, Comprising: A substrate, and a light-emitting structure and a light-emitting region defining layer disposed on one side of the substrate. The light-emitting structure includes an anode layer, a light-emitting layer, and a cathode layer stacked, and the anode layer is closer to the substrate than the cathode layer. The substrate has a plurality of sub-pixel regions distributed in an array. The anode layer includes anode units corresponding to the plurality of sub-pixel regions one by one. The light-emitting region defining layer includes a first defining structure, and adjacent anode units are spaced apart by the first defining structure. The anode unit includes a conductive connection portion and a main body portion. The main body portion includes a main trunk portion connected to the conductive connection portion and at least two branch trunk portions connected to the main trunk portion, and adjacent branch trunk portions are spaced apart.

2. The display substrate according to claim 1, wherein In the main body portion, there are first openings between the main trunk portion and the branch trunk portions and between adjacent branch trunk portions. In a direction perpendicular to the substrate, a longitudinal cross-section of the first opening is rectangular or trapezoidal in an inverted shape. The light-emitting layer covers sidewalls and a bottom of the first opening.

3. The display substrate according to claim 1, characterized in that In the main body portion, there are first openings between the main trunk portion and the branch trunk portions and between adjacent branch trunk portions. In a direction perpendicular to the substrate, a longitudinal cross-section of the first opening is in a Chinese character 'zhong' shape, and the light-emitting region defining layer further includes a second defining structure disposed at the first opening.

4. The display substrate according to claim 3, wherein The second defining structure and the first defining structure are provided with the same layer and the same material.

5. The display substrate according to any one of claims 1-4, characterized in that, A positive projection of the main trunk portion on the substrate is annular, a positive projection of the branch trunk portion on the substrate is T-shaped, the branch trunk portion is located inside the main trunk portion, and the conductive connection portion is located outside the main trunk portion.

6. The display substrate according to claim 5, wherein In each anode unit, the conductive connection portion connects at least two spaced-apart main body portions, and adjacent main body portions are spaced apart by the first defining structure.

7. A display device, characterized in that, Including the display substrate according to any one of claims 1-6.

8. A method for preparing a display substrate, characterized in that Comprising: Providing a substrate, the substrate having a display area and a non-display area surrounding the display area, and the display area includes a plurality of sub-pixel regions distributed in an array. Forming a light-emitting structure and a light-emitting region defining layer on one side of the substrate. The light-emitting structure includes an anode layer, a light-emitting layer, and a cathode layer stacked, the anode layer is closer to the substrate than the cathode layer, the anode layer includes anode units corresponding to the plurality of sub-pixel regions one by one, and the light-emitting region defining layer includes a first defining structure, and adjacent anode units are spaced apart by the first defining structure. Wherein, the anode unit includes a conductive connection portion and a main body portion. The main body portion includes a main trunk portion connected to the conductive connection portion and at least two branch trunk portions connected to the main trunk portion, and adjacent branch trunk portions are spaced apart.

9. The method for preparing a display substrate according to claim 8, wherein, A method for forming the anode layer includes: Forming a first transparent layer on one side in the display area of the substrate, and the first transparent layer has a plurality of first sub-openings. A reflective film layer is formed on a side of the first transparent layer away from the substrate, and the reflective film layer is etched to form a first reflective structure layer, and the first reflective structure layer has second sub-openings corresponding to the plurality of first sub-openings one by one; A transparent film layer is formed on a side of the first reflective structure layer away from the substrate, and the transparent film layer is etched to form a first transparent structure layer, and the first transparent structure layer has third sub-openings corresponding to the plurality of first sub-openings one by one; The first reflective structure layer and the first transparent structure layer are etched by a single etching process to form a second transparent layer and a reflective electrode layer; A positive projection of the first sub-opening on the substrate falls within a positive projection of the second sub-opening on the substrate, and the positive projection of the second sub-opening on the substrate falls within a positive projection of the third sub-opening on the substrate; Wherein, the anode layer has an opening portion that penetrates the first transparent layer, the reflective electrode layer, and the second transparent layer in a direction perpendicular to the substrate, the opening portion includes a plurality of first openings and a plurality of second openings, each of the first openings includes the first sub-opening, the second sub-opening, and the third sub-opening correspondingly arranged in a direction perpendicular to the substrate, the anode layer separates a plurality of the anode units through the second openings, and the anode units separate the main trunk portion and a plurality of branch trunk portions through the first openings; in a direction perpendicular to the substrate, a longitudinal cross-section of the first opening is rectangular or trapezoidal in reverse.

10. The manufacturing method of the display substrate according to claim 8, characterized in that, The method for forming the anode layer includes: Forming a first transparent layer on one side of the substrate; Sequentially forming a reflective film layer and a transparent film layer on a side of the first transparent layer away from the substrate; The transparent film layer and the reflective film layer are etched by a single etching process to form a second transparent layer and a reflective electrode layer; Wherein, the anode layer has an opening portion that penetrates the first transparent layer, the reflective electrode layer, and the second transparent layer in a direction perpendicular to the substrate, the opening portion includes a plurality of first openings and a plurality of second openings, the anode layer separates a plurality of the anode units through the second openings, and the anode units separate the main trunk portion and a plurality of branch trunk portions through the first openings; in a direction perpendicular to the substrate, a longitudinal cross-section of the first opening is in a shape of Chinese character 'zhong'.

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