Patent Publication Number: US-2023157080-A1

Title: Display panel, manufacturing method thereof, and display device

Description:
BACKGROUND OF INVENTION 
     Field of Invention 
     The present application relates to the field of display technology, and in particular to a display panel, a manufacturing method thereof, and a display device. 
     Description of Prior Art 
     Compared with liquid crystal display (LCD), active matrix organic light-emitting display (AMOLED) has advantages of high color gamut, high contrast, flexibility, and wearability. According to manufacturing processes of OLED, the manufacturing of AMOLED can be divided into evaporation coating type and ink jet print (IJP) type. For manufacturing of large-size display backplanes, use of evaporation coating technology needs to rely on white light OLED (WOLED) combined with color filters (CFs) to achieve color display, while CF-free display corresponding to a fine mask cannot be applied to mass production of large-size display backplanes in high-generation production lines. The inkjet printing process has overcome shortcomings of the evaporation coating technology to a certain extent, can directly realize printing of full-color pixels in the big generation production line, and greatly improves use efficiency of OLED materials. The inkjet printing process needs to rely on a specially designed pixel definition layer. A pixel definition layer of traditional side by side (SBS) type design performs pixel opening on an entire patterned surface of the pixel definition layer, and the OLED materials are printed in the openings. However, the OLED materials of a same color are separated by the pixel definition layer, and continuous printing of the inkjet printing process cannot be realized, which greatly limits advantages of printing technology and reduces printing efficiency. 
     Therefore, there is a need to solve the problem that the pixel definition layer of the existing SBS-type design impacts the printing efficiency. 
     SUMMARY OF INVENTION 
     The present application provides a display panel, a manufacturing method thereof, and a display device to alleviate the technical problem that the pixel definition layer of the existing SBS-type design impacts printing efficiency. 
     In order to solve the above problems, the technical solutions provided by the present application are as follows: 
     An embodiment of the present application provides a display panel, wherein a pixel definition layer of the display panel includes: 
     a plurality of first pixel banks arranged along a first direction; and 
     a plurality of second pixel banks arranged along a second direction, wherein adjacent ones of the first pixel banks and adjacent ones of the second pixel banks surround to define one of light-exiting areas; and an included angle is formed between the first direction and the second direction, 
     wherein, in the second direction, light-emitting materials in the light-exiting areas are the same; a thickness of the second pixel banks is greater than a thickness of the first pixel banks. 
     In the display panel provided by the embodiment of the present application, a material of the first pixel banks includes a hydrophilic organic material. 
     In the display panel provided by the embodiment of the present application, a material of the second pixel banks includes a hydrophobic organic material. 
     In the display panel provided by the embodiment of the present application, the first pixel banks and the second pixel banks are integrally disposed. 
     In the display panel provided by the embodiment of the present application, in the first direction, the light-emitting materials in adjacent ones of the light-exiting areas are different. 
     In the display panel provided by the embodiment of the present application, the display panel includes: 
     an array substrate; 
     a plurality of first electrodes arranged in an array on the array substrate, wherein each of first intervals is formed between adjacent ones of the first electrodes in the first direction, and each of second intervals is formed between adjacent ones of the first electrodes in the second direction; and 
     wherein the pixel definition layer is disposed on the first electrodes and the array substrate, the first pixel banks are disposed in the first intervals and cover portions of the first electrodes; and the second pixel banks are arranged in the second intervals and cover the first pixel banks and portions of the first electrodes; and 
     wherein the light-exiting areas defined by the pixel definition layer correspond to the first electrodes, and the light-emitting materials covering the first electrodes form a light-emitting layer. 
     In the display panel provided by the embodiment of the present application, the thickness of the first pixel banks is greater than or equal to a thickness of the light-emitting layer. 
     In the display panel provided by the embodiment of the present application, the thickness of the first pixel banks is greater than a thickness of the first electrodes. 
     In the display panel provided by the embodiment of the present application, the thickness of the first pixel banks ranges from 0.1 micrometers to 0.6 micrometers, and the thickness of the second pixel banks ranges from 0.8 micrometers to 2 micrometers. 
     Another embodiment of the present application also provides a method of manufacturing a display panel, which includes the following steps: providing an array substrate and forming a plurality of first electrodes arranged in an array on the array substrate, wherein each of first intervals is formed between adjacent ones of the first electrodes in the first direction, and each of second intervals is formed between adjacent ones of the first electrodes in the second direction; forming first pixel banks in the first intervals, wherein a thickness of the first pixel banks is greater than a thickness of the first electrodes; forming second pixel banks in the second intervals to form a pixel definition layer, wherein a thickness of the second pixel banks is greater than the thickness of the first pixel banks, and the second pixel banks cover portions of the first pixel banks and portions of the first electrodes, so that each of printing grooves is formed between adjacent ones of the second pixel banks; continuously printing light-emitting materials of a same color in a same one of the printing grooves, and printing light-emitting materials of different colors in different ones of the printing grooves to form a light-emitting layer, wherein the light-emitting layer is formed on the first electrodes which are not covered by the second pixel banks; and depositing second electrodes on the light-emitting layer. 
     In the method of manufacturing the display panel provided by an embodiment of the present application, a material of the first pixel banks includes a hydrophilic organic material, and a material of the second pixel banks includes a hydrophobic organic material. 
     Still another embodiment of the present application also provides a display device, which includes the display panel of one of the foregoing embodiments. 
     In the display panel, the manufacturing method thereof, and the display device provided by the present application, a plurality of first electrodes are arranged on an array substrate of the display device, first intervals and second intervals are defined between the plurality of first electrodes, a plurality of first pixel banks are arranged corresponding to the first intervals, and a plurality of second pixel banks are arranged corresponding to the second intervals, wherein the second pixel banks cross over the first pixel banks, a thickness of each of the first pixel banks and the second pixel banks is greater than a thickness of the first electrodes, and the thickness of the second pixel banks is greater than the thickness of the first pixel banks, so that the light-emitting materials of a same color can be continuously printed between adjacent ones of the second pixel banks, which solves the problem that the pixel definition layer of the existing SBS-type design cannot be continuously printed, which impacts printing efficiency. Meanwhile, the first pixel banks are made of a hydrophilic organic material, which can quickly disperse the printed light-emitting materials in areas defined by the first pixel banks, thereby improving the printing efficiency; and the second pixel banks are made of a hydrophobic organic material to prevent the printed light-emitting materials from overflowing and causing color mixing. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the embodiments or the technical solutions of the existing art, the drawings illustrating the embodiments or the existing art will be briefly described below. Obviously, the drawings in the following description merely illustrate some embodiments of the present invention. Other drawings may also be obtained by those skilled in the art according to these FIGs. without paying creative work. 
         FIG.  1    is a schematic structural diagram illustrating a top view of a display panel provided by an embodiment of the present application. 
         FIG.  2    is a schematic structural diagram illustrating a top view of an arrangement of a first electrode array according to an embodiment of the present application. 
         FIG.  3    is a schematic cross-sectional structural diagram along an A-A′ direction in  FIG.  1   . 
         FIG.  4    is a schematic cross-sectional structural diagram along a B-B′ direction in  FIG.  1   . 
         FIG.  5    is a schematic cross-sectional structural diagram along a C-C′ direction in  FIG.  1   . 
         FIG.  6    is a schematic cross-sectional structural diagram of the display panel provided by an embodiment of the present application. 
         FIG.  7    is a schematic diagram of a cross-sectional structure of an array substrate provided by an embodiment of the present application. 
         FIG.  8    is a schematic structural diagram illustrating a top view of a display panel provided by another embodiment of the present application. 
         FIG.  9    is a schematic flowchart of a method of manufacturing a display panel provided by an embodiment of the present application. 
         FIG.  10    to  FIG.  12    are schematic structural diagrams illustrating a partial top view of the display panel manufactured in each step of the display panel manufacturing method provided by the embodiments of the present application. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The following description of the various embodiments is provided to illustrate the specific embodiments of the invention. Directional terms mentioned in the present invention, such as “vertical”, “horizontal”, “upper”, “bottom”, “pre”, “post”, “left”, “right”, “inside”, “outside”, “side”, etc., only refer to the direction of the additional drawing. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention. In the drawings, structurally similar elements are denoted by the same reference numerals. In the drawings, the thickness of some layers and areas is exaggerated for clear understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not particularly limited thereto. 
     In an embodiment, refer to  FIG.  1   , which is a schematic structural diagram illustrating a top view of a display panel provided by an embodiment of the present application. A display panel  100  includes an OLED display panel, etc., for example, an AMOLED display panel. The display panel  100  includes an array substrate  10 , a plurality of first electrodes  20 , a pixel definition layer  30 , a light-emitting layer  50 , etc., wherein the pixel definition layer  30  includes a plurality of first pixel banks  31  arranged along a first direction X and a plurality of second pixel banks  32  arranged along a second direction Y, and a thickness of the second pixel banks  32  is greater than a thickness of the first pixel banks  31 . In addition, adjacent ones of the first pixel banks  31  and adjacent ones of the second pixel banks  32  surround to define one of light-exiting areas. Light-emitting materials are arranged in the light-exiting areas to form the light-emitting layer  50 . 
     An included angle a is formed between the first direction X and the second direction Y, and the included angle a may be greater than 0 degrees and less than 180 degrees. As shown in  FIG.  1   , the first direction X is parallel to a horizontal side of the array substrate  10 , the second direction Y is parallel to a vertical side of the array substrate  10 , and the included angle a is 90 degrees at this time. In the second direction Y, the light-emitting materials in the light-exiting areas are the same. 
     Specifically, refer to  FIG.  2   , which is a schematic structural diagram illustrating a top view of an arrangement of a first electrode array according to an embodiment of the present application. A plurality of first electrodes  20  are arranged in an array on the array substrate  10 , a first interval  211  is formed between adjacent ones of the first electrodes  20  in the first direction X, and a second interval  222  is formed between adjacent ones of the first electrodes  20  in the second direction Y. Exemplarily, each of the first electrodes  20  includes a short side  21  and a long side  22 , the short side  21  is arranged along the first direction X, and the long side  22  is arranged along the second direction Y The short side  21  of the first electrode  20  refers to a side of the first electrode  20  with a shorter side length in a top view. A shape of the short side  21  can be a straight line, a broken line, an arc, etc., and as shown in  FIG.  2   , a shape of the short side  21  of the first electrode  20  is a circular arc. Of course, the long side  22  of the first electrode  20  refers to a side of the first electrode  20  with a longer side length in a top view. 
     Optionally, the first electrodes  20  are arranged in an array on the array substrate  10  into multiple rows and multiple columns, the row refers to an arrangement along the first direction X, and the column refers to an arrangement along the second direction Y, wherein the first electrodes  20  in each row are parallel to each other, and the first electrodes  20  in each column are also parallel to each other. When the included angle a between the first direction X and the second direction Y is 90 degrees, each row and each column are perpendicular to each other, so that the first interval  211  and the second interval  222  also perpendicularly intersect each other. Of course, the present application is not particularly limited to this. The rows and columns of the first electrodes  20  of the present application may also be arranged to have a certain included angle, so that the first interval  211  and the second interval  222  are also arranged to have a certain included angle. 
     Referring to  FIGS.  1  to  5    in conjunction,  FIG.  3    is a schematic cross-sectional structural diagram along an A-A′ direction in  FIG.  1   ,  FIG.  4    is a cross-sectional structure schematic diagram along a B-B′ direction in  FIG.  1   , and  FIG.  5    is a cross-sectional structure schematic diagram along a C-C′ direction in  FIG.  1   . The first pixel banks  31  are disposed in the first intervals  211  and cover portions of the first electrodes  20 . The thickness of the first pixel banks  31  is greater than the thickness of the first electrodes  20 , so the first pixel banks  31  fill the first intervals  211  and exceed the thickness of the first electrodes  20 , and cover portions of the short sides  21  of the first electrodes  20 . As shown in  FIG.  1   , the short side  21  of each of the first electrodes  20  has a shape of a circular arc, and the first pixel banks  31  cover portions of the circular arcs. 
     The second pixel banks  32  are disposed in the second intervals  222  and cover the first pixel banks  31  and portions of the first electrodes  20 . The thickness of the second pixel banks  32  is greater than the thickness of the first electrodes  20 , so the second pixel banks  32  fill the second intervals  222  and exceed the thickness of the first electrodes  20 , and cover the long sides  22  of the first electrodes  20  and portions of the short sides  21  which are not covered by the first pixel banks  31 , so as to define the light-exiting areas by the first pixel banks  31  and the second pixel banks  32 . 
     Meanwhile, the thickness of the second pixel banks  32  is greater than the thickness of the first pixel banks  31 , and in areas where the second pixel banks  32  intersect the first pixel banks  31 , the second pixel banks  32  cover the first pixel banks  31 , as shown in  FIG.  5   . 
     Optionally, the thickness of the first pixel banks  31  ranges from 0.1 μm to 0.6 μm, and the thickness of the second pixel banks  32  ranges from 0.8 μm to 2 μm. 
     It should be noted that the short side  21  of each of the first electrodes  20  is a circular arc, the first pixel banks  31  cover portions of the short sides  21  of the first electrodes  20 , and the second pixel banks  32  cover the long sides  22  of the first electrodes  20  and portions of the short sides  21  not covered by the first pixel banks  31 , so as shown in  FIG.  5   , the second pixel banks  32  still cover the first pixel bank  31  at a position close to the light-exiting areas. 
     Since the thickness of the second pixel banks  32  is greater than the thickness of the first pixel banks  31 , each of printing grooves  321  is formed between adjacent ones of the second pixel banks  32 , and the light-emitting materials can be continuously printed along an extension direction of the printing grooves  321  to form the light-emitting layer  50 . 
     Specifically, the light-emitting layer  50  is disposed on the first electrodes  20  that are not covered by the second pixel banks  32 . The light-emitting layer  50  is formed by printing light-emitting materials of different colors in different ones of the printing grooves  321  to form a light-emitting layer. By printing light-emitting materials of a same color in a same one of the printing grooves  321 , the light-emitting materials of the same color are arranged between adjacent ones of the second pixel banks  32 , so that in the second direction Y, the light-emitting materials in the light-exiting areas are the same. Optionally, the light-emitting materials of the light-emitting layer  50  include a red light-emitting material  51 , a green light-emitting material  52 , and a blue light-emitting material  53 . 
     Further, referring to  FIG.  1    in conjunction with  FIG.  4   , the red light-emitting material  51 , the green light-emitting material  52 , and the blue light-emitting material  53  are respectively arranged in different printing grooves  321 . Of course,  FIG.  4    schematically shows three printing grooves  321 , but the display panel  100  may include more first electrodes  20 , so that more second pixel banks  32  can be provided to form more printing grooves  321 , and thus the red light-emitting material  51 , the green light-emitting material  52 , and the blue light-emitting material  53  are sequentially and cyclically arranged in the more printing grooves  321 . The thickness of the second pixel banks  32  is greater than a thickness of the light-emitting layer  50 . 
     Meanwhile, referring to  FIG.  1   , the light-emitting materials of the same color printed between adjacent ones of the second pixel banks  32  are separated by the first pixel banks  31 , so that the light-emitting materials only cover the first electrode  20  in the light-exiting areas, but not cover the first pixel bank  31 . In addition, the light-emitting materials with different colors are printed in different printing grooves  321 , so that the light-emitting materials of different colors are arranged at intervals between adjacent ones of the first pixel banks  31 , and as such, in the first direction X, the light-emitting materials in adjacent ones of the light-emitting areas are different. That is, the first pixel banks  31  are used to define the light-emitting materials of the same color, and the second pixel banks  32  are used to define the light-emitting materials of different colors. 
     Optionally, the thickness of the first pixel banks  31  is greater than or equal to the thickness of the light-emitting layer  50 . 
     Optionally, a material of the first pixel banks  31  includes a hydrophilic organic material, and the first pixel banks  31  made of the hydrophilic organic material have hydrophilic characteristics. The material of the second pixel banks  32  includes a hydrophobic organic material, for example, a fluorine-containing organic material having hydrophobic characteristics, and the second pixel banks  32  made of a hydrophobic organic material have hydrophobic characteristics. 
     It should be noted that when preparing the light-emitting layer  50 , light-emitting materials of different colors are dissolved in a solvent to form different inks, and inks of different concentrations are formulated according to the thickness of the light-emitting layer  50  to be prepared. Then, the inks are printed in the printing grooves  321  formed between adjacent ones of the second pixel banks  32  by inkjet printing, and the inks are cured into a film to form the light-emitting layer  50 . 
     When printing ink in the printing grooves  321 , a volume of the inks is much larger than the volume of the light-emitting layer  50  after curing and forming into a film. Since the inks have fluidity, the first pixel banks  31  with hydrophilic characteristics can accelerate the flow of ink in the printing grooves  321  at this time so that the printed ink can be quickly dispersed in the areas defined by the first pixel banks  31  to prevent inks from accumulating and overflowing in a certain area, which can further improve efficiency of continuous printing. Meanwhile, the second pixel banks  32  with hydrophobic characteristics can prevent the printed inks from overflowing into adjacent ones of the printing grooves  321  and causing color mixing. Of course, the thickness of the second pixel banks  32  needs to match a height of the printed inks. 
     In addition, in order to realize light emission of the light-emitting layer  50 , a second electrode  60  needs to be further provided, and the second electrode  60  covers the light-emitting layer  50  and the second pixel bank  32 , as shown in  FIG.  6   . The first electrode  20  is an anode, and the second electrode  60  is a cathode, but the present application is not particularly limited thereto. The light-emitting layer  50  emits light under a collaboration of the first electrode  20  and the second electrode  60 , and the array substrate  10  provides a driving voltage for the first electrode  20 . 
     Refer to  FIG.  7   , which is a schematic diagram of a cross-sectional structure of an array substrate provided by an embodiment of the present application. Optionally, the array substrate  10  may include a base substrate  11 , and a light-shielding layer  12 , a buffer layer  13 , an active layer  14 , a gate insulating layer  15 , a gate  16 , an interlayer insulating layer  17 , a source/drain layer  18 , a passivation layer  19 , and a planarization layer  191  which are sequentially stacked on the base substrate  11 . 
     Optionally, the base substrate  11  may be a rigid substrate or a flexible substrate. When the base substrate  11  is a rigid substrate, it may include a rigid substrate such as a glass substrate, etc.; meanwhile, when the base substrate  11  is a flexible substrate, it may include a flexible substrate such as a polyimide (PI) film, an ultra-thin glass film, etc. 
     Optionally, a material of the buffer layer  13  may include an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, etc., and the buffer layer  13  may prevent undesired impurities or contaminants (such as moisture, oxygen, etc.) from diffusing from the base substrate  11  into devices that may be damaged by these impurities or contaminants, and meanwhile can provide a flat top surface. 
     Optionally, a material of the active layer  14  may be a metal oxide semiconductor material, such as IGZO, ITZO, or IGZTO. The active layer  14  includes a channel area  141 , a source area  142 , and a drain area  143 . The light-shielding layer  12  is disposed corresponding to the active layer  14 , and the light-shielding layer  12  may be a metal light-shielding layer for shielding the active layer  14  to prevent light from irradiating the channel area  141 . The gate  16  and the gate insulating layer  15  are both arranged corresponding to the channel area  141 . 
     The source/drain layer  18  includes a source  181  and a drain  182 . The drain  182  is connected to the drain area  143  through a via hole of the interlayer insulating layer  17 , the source  181  is connected to the source area  142  through another via hole of the interlayer insulating layer  17 , and the source  181  is also connected to the light-shielding layer  12  through a via hole penetrating the interlayer insulating layer  17  and the buffer layer  13 . 
     The passivation layer  19  covers the source/drain layer  18  and the interlayer insulating layer  17 , and the planarization layer  191  covers the passivation layer  19 . A material of the planarization layer  191  includes an organic material such as organic photoresist, and the planarization layer  191  can provide a flat top surface for the array substrate  10 . The array substrate  10  is further provided with an opening penetrating through the planarization layer  191  and the passivation layer  19 , the opening exposes the source  181 , and the first electrode  20  is connected to the source  181  through the opening. 
     It should be noted that this embodiment schematically shows a structure of the array substrate  10 , but the present application is not particularly limited thereto, and the array substrate  10  of the present application may also be other types of array substrates, such as gate driver on array (GOA) substrate, etc., which will not be repeated herein for brevity. 
     In addition, the display panel  100  may further include an encapsulation layer (not shown) disposed on the second electrode  60 , the encapsulation layer may adopt thin film encapsulation, and the thin film encapsulation may be a stack structure composed of a first inorganic encapsulation layer, an organic encapsulation layer, and the second inorganic encapsulation layer which are stacked in sequence, or may be a stack structure of more layers, which are used to protect the light-emitting layer  50  by preventing water and oxygen from entering the light-emitting layer  50  and causing failure of the light-emitting material of the light-emitting layer  50 . 
     In this embodiment, the first pixel banks  31  and the second pixel banks  32  are provided on the array substrate  10 , and the second pixel banks  32  cross over the first pixel banks  31 , and the thickness of the second pixel banks  32  is greater than the thickness of the first pixel banks  31 , so that the light-emitting materials of a same color can be continuously printed between adjacent ones of the second pixel banks  32 , which solves the problem that the pixel definition layer of the existing SBS-type design cannot be continuously printed and impacts printing efficiency. Meanwhile, the first pixel banks  31  are made of a hydrophilic organic material, which can quickly disperse the printed light-emitting materials in areas defined by the first pixel banks  31 , thereby improving the printing efficiency; and the second pixel banks  32  are made of a hydrophobic organic material to prevent the printed light-emitting materials from overflow causing color mixing. 
     In an embodiment, refer to  FIG.  8   , which is a schematic structural diagram illustrating a top view of a display panel provided by another embodiment of the present application. A difference from the foregoing embodiments is that in the display panel  101  shown in  FIG.  8   , the first pixel banks  31  between adjacent ones of the second pixel banks  32  are covered with the light-emitting material. A thickness of the first pixel banks  31  may be less than a thickness of the light-emitting layer  50 , and continuous printing can still be used when printing light-emitting materials to form the light-emitting layer  50 , which improves printing efficiency, and the formed light-emitting layer  50  is also continuous. Related descriptions can be referred to the above-mentioned embodiments, which will not be repeated herein for brevity. 
     In an embodiment, a difference from the foregoing embodiments is that the first pixel banks  31  and the second pixel banks  32  are integrally arranged, and the first pixel banks  31  and the second pixel banks  32  are formed of the same material under the same process conditions simultaneously. Optionally, a half-tone mask (HTM) is used to perform a photolithography process on a blanket pixel definition layer  30  covering the first electrode  20  and the array substrate  10 , so that the pixel definition layer  30  is formed with thinner first pixel banks  31  in a first direction X, and formed with thicker second pixel banks  32  in a second direction Y, thereby forming the pixel definition layer  30  structure as shown in  FIG.  1   . A material of the pixel definition layer  30  includes a hydrophobic organic material or the like. Related descriptions can be referred to the above-mentioned embodiments, which will not be repeated herein for brevity. 
     In an embodiment, refer to  FIG.  9   , which is a schematic flowchart of a method of manufacturing a display panel provided by an embodiment of the present application. The method of manufacturing the display panel includes the following steps: 
     S 301 : providing an array substrate  10  and forming a plurality of first electrodes  20  arranged in an array on the array substrate  10 , wherein each of first intervals  211  is formed between adjacent ones of the first electrodes  20  in a first direction X, and each of second intervals  222  is formed between adjacent ones of the first electrodes in a second direction Y. 
     Specifically, referring to  FIG.  2    in conjunction with  FIG.  7   , an array substrate  10  as shown in  FIG.  7    is provided. The array substrate  10  includes a base substrate  11 , and a light-shielding layer  12 , a buffer layer  13 , an active layer  14 , a gate insulating layer  15 , a gate  16 , an interlayer insulating layer  17 , a source/drain layer  18 , a passivation layer  19 , and a planarization layer  191  which are sequentially stacked on the base substrate  11 . 
     Specifically, the base substrate  11  is provided. The base substrate  11  may be a rigid substrate or a flexible substrate. When the base substrate  11  is a rigid substrate, it may include a rigid substrate such as a glass substrate, etc.; meanwhile, when the base substrate  11  is a flexible substrate, it may include a flexible substrate such as a polyimide film, an ultra-thin glass film, etc. 
     Optionally, a metal layer is deposited on the base substrate  11 , the metal layer may be a single layer or a stack of multiple metal layers, and the metal layer is patterned to form the light-shielding layer  12  with wiring and light-shielding functions. 
     Optionally, a deposition process such as plasma enhanced chemical vapor deposition (PECVD) is used to deposit a buffer layer  13  on the light-shielding layer  12  and the base substrate  11 . A material of the buffer layer  13  may be an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, etc., for example one or a combination of Si3N4, SiO2, SiON, and the like. A thickness of the buffer layer  13  may range from 1000 angstroms to 5000 angstroms. 
     Optionally, a deposition process such as physical vapor deposition (PVD) is used to deposit a metal oxide semiconductor material on the buffer layer  13 , and the metal oxide semiconductor material may be IGZO, ITZO, IGZTO, or the like. The metal oxide semiconductor is patterned to form the active layer  14 , and a thickness of the active layer  14  may range from 100 angstroms to 1000 angstroms. 
     Optionally, a deposition process such as plasma enhanced chemical vapor deposition (PECVD) is used to deposit a gate dielectric material on the active layer  14  and the buffer layer  13 , and the gate dielectric material includes SiOx or the like. A thickness of the deposited gate dielectric material may range from 500 angstroms to 2000 angstroms. 
     Optionally, a deposition process such as physical vapor deposition (PVD) is used to deposit a gate metal layer on the gate dielectric material, and the gate metal layer is patterned to form a gate pattern. Using the gate pattern as a mask, the gate dielectric material is etched, and the gate  16 , the gate insulating layer  15 , and a channel area  141  of the active layer  14  are formed in a self-aligned manner, so that the active layer  14  is divided into the channel area  141 , a source area  142 , and a drain area  143 . 
     Optionally, a deposition process such as PECVD is used to deposit an inorganic film such as SiO2 on the gate  16 , the active layer  14 , and the buffer layer  13  to form the interlayer insulating layer  17 , and a thickness of the interlayer insulating layer  17  may range from 2000 angstroms to 8000 angstroms. The interlayer insulating layer  17  and the buffer layer  13  are patterned to form a plurality of via holes. 
     Optionally, a deposition process such as PVD is used to deposit a source/drain metal layer on the interlayer insulating layer  17 , and the source/drain metal layer is patterned to form a source/drain layer  18 . The source/drain layer  18  includes a source  181  and a drain  182 . The drain  182  is connected to the drain area  143  of the active layer  14  through a via hole of the interlayer insulating layer  17 . The source  181  is connected to the source area  142  of the active layer  14  through another via hole of the interlayer insulating layer  17 , and also connected to the light-shielding layer  12  through a via hole penetrating the interlayer insulating layer  17  and the buffer layer  13 . 
     Optionally, a deposition process such as PECVD is used to deposit an inorganic film such as SiO2 on the source/drain layer  18  and the interlayer insulating layer  17  to form the passivation layer  19 , and a thickness of the passivation layer  19  may range from 1000 angstroms to 5000 Angstroms. Hereafter, a planarization layer  191  is deposited on the passivation layer  19 , and a material of the planarization layer  191  includes organic photoresist or the like. The planarization layer  191  and the passivation layer  19  are patterned to form openings, thus completing fabrication of the array substrate  10 . 
     Further, an electrode material is deposited on the array substrate  10 , and the electrode material is patterned to form a plurality of first electrodes  20  arranged in an array, as shown in  FIG.  2   . The electrode material includes a transparent conductive electrode material, such as indium tin oxide (ITO) or the like. Of course, the present application is not particularly limited thereto, and the first electrodes  20  of the present application may also be opaque electrodes, which may be specifically determined according to the light-emitting direction of the display panel  100 . 
     Optionally, a plurality of first electrodes  20  are arranged in an array on the array substrate  10 , first intervals  211  are formed between adjacent ones of the first electrodes  20  in the first direction X, and second intervals  222  are formed between adjacent ones of the first electrodes  20  in the second direction Y. Exemplarily, the first electrode  20  includes a short side  21  and a long side  22 . The short side  21  is arranged along the first direction X, and the long side  22  is arranged along the second direction Y. There are first intervals  211  between the short sides  21  of adjacent ones of the first electrode  20 , and there are second intervals  222  between the long sides  22  of adjacent ones of the first electrodes  20 . 
     S 302 : forming first pixel banks  31  in the first intervals  211 , wherein a thickness of the first pixel banks  31  is greater than a thickness of the first electrodes  20 , so that the first pixel banks  31  cover portions of the first electrodes  20 . 
     Specifically, a hydrophilic organic material is blanketly deposited on the first electrode  20  and the array substrate  10 , and the hydrophilic organic material is patterned to form the first pixel banks  31 . The first pixel banks  31  correspond to the first intervals  211 , and the first pixel banks  31  cover portions of the first electrodes  20 . As shown in  FIG.  10   , the first pixel banks  31  cover the portions of the short sides  21  of the first electrodes  20 . The thickness of the first pixel banks  31  is greater than the thickness of the first electrode  20 . Optionally, the thickness of the first pixel banks  31  ranges from 0.1 μm to 0.6 μm. 
     S 303 : forming second pixel banks  32  in the second intervals  222  to form a pixel definition layer  30 , wherein a thickness of the second pixel banks  32  is greater than the thickness of the first pixel banks  31 , and the second pixel banks  32  cover portions of the first pixel banks  31  and portions of the first electrodes  20 , so that each of printing grooves  321  is formed between adjacent ones of the second pixel banks  32 . 
     Specifically, a hydrophobic organic material is blanketly deposited on the first pixel banks  31 , the first electrode  20 , and the array substrate  10 , and the hydrophobic organic material is patterned to form the second pixel banks  32 . The second pixel banks  32  correspond to the second intervals  222 , and the second pixel banks  32  cover portions of the first pixel banks  31  and portions of the first electrodes  20  to form a pixel definition layer  30 , as shown in  FIG.  11   . The portions of the first pixel banks  31  covered by the second pixel banks  32  refer to portions of the first pixel banks  31  overlapping the second pixel banks  32 ; the portions of the first pixel banks  31  covered by the second pixel banks  32  include the long sides  22  of the first electrodes  20  and the short sides  21  of the first electrodes  20  not covered by the first pixel banks  31 . A thickness of the second pixel banks  32  is greater than a thickness of the first pixel banks  31 , and optionally, the thickness of the second pixel banks  32  ranges from 0.8 μm to 2 μm. 
     Since the second pixel banks  32  cover portions of the first pixel banks  31  and portions of the first electrodes  20 , and the thickness of the second pixel banks  32  is greater than the thickness of the first pixel banks  31 , printing grooves  321  are formed between adjacent ones of the second pixel banks  32 , as shown in  FIG.  11   . 
     S 304 : continuously printing light-emitting materials of a same color in a same one of the printing grooves  321 , and printing light-emitting materials of different colors in different ones of the printing grooves  321  to form a light-emitting layer  50 , wherein the light-emitting layer  50  is formed on the first electrodes  20  which are not covered by the second pixel banks  32 . 
     Specifically, light-emitting materials of different colors are dissolved in solvents to form different inks, and then inkjet printing is used to print the inks in the printing grooves  321  formed between adjacent ones of the second pixel banks  32 . Inks made of light-emitting materials of different colors are printed in different ones of the printing grooves  32 , and the ink is cured into a film to form a light-emitting layer  50 , as shown in  FIG.  12   . Referring to  FIG.  12    in conjunction with  FIG.  4   , the red light-emitting material  51 , the green light-emitting material  52 , and the blue light-emitting material  53  are arranged in different printing grooves  321  at intervals. Since the printing grooves  321  are continuous, ink can be continuously printed in the printing grooves  321 , and the concentration of the ink can be prepared according to the thickness of the light-emitting layer  50 . 
     Of course,  FIG.  4    schematically shows three printing grooves  321 , but the display panel  100  may include more first electrodes  20 , so that more second pixel banks  32  can be provided to form more printing grooves  321 , and thus the red light-emitting material  51 , the green light-emitting material  52 , and the blue light-emitting material  53  are sequentially and cyclically arranged in the more printing grooves  321 . The thickness of the second pixel banks  32  is greater than a thickness of the light-emitting layer  50 . 
     Meanwhile, the light-emitting materials of the same color between adjacent ones of the second pixel banks  32  are separated by the first pixel bank  31 , so that the light-emitting materials only cover the first electrode  20  in the light-exiting areas, but not cover the first pixel bank  31 . In addition, the light-emitting materials with different colors are printed in different printing grooves  321 , so that the light-emitting materials of different colors are arranged at intervals between adjacent ones of the first pixel banks  31 , and as such, in the first direction X, the light-emitting materials in adjacent ones of the light-emitting areas are different. That is, the first pixel banks  31  are used to define the light-emitting materials of the same color, and the second pixel banks  32  are used to define the light-emitting materials of different colors. 
     Optionally, the thickness of the first pixel banks  31  is greater than or equal to the thickness of the light-emitting layer  50 . 
     In addition, when printing ink in the printing grooves  321 , a volume of the inks is much larger than the volume of the light-emitting layer  50  after curing and forming into a film. Since the inks have fluidity, the first pixel banks  31  with hydrophilic characteristics can accelerate the flow of ink in the printing grooves  321  at this time so that the printed ink can be quickly dispersed in the areas defined by the first pixel banks  31  to prevent inks from accumulating and overflowing in a certain area, which can further improve efficiency of continuous printing. Meanwhile, the second pixel banks  32  with hydrophobic characteristics can prevent the printed inks from overflowing into adjacent ones of the printing grooves  321  and causing color mixing. Of course, the thickness of the second pixel banks  32  needs to match a height of the printed inks. 
     S 305 : depositing second electrodes  60  on the light-emitting layer  50 . 
     Specifically, in order to realize light emission of the light-emitting layer  50 , a second electrode  60  needs to be further provided, and the second electrode  60  covers the light-emitting layer  50  and the second pixel bank  32 , as shown in  FIG.  6   . The first electrode  20  is an anode, and the second electrode  60  is a cathode, but the present application is not particularly limited thereto. The light-emitting layer  50  emits light under a collaboration of the first electrode  20  and the second electrode  60 , and the array substrate  10  provides a driving voltage for the first electrode  20 . 
     It should be noted that the method of manufacturing the display panel of the present application may further include preparing an encapsulation layer on the second electrode  60 . The encapsulation layer may adopt thin film encapsulation, and the thin film encapsulation may be a stack structure composed of a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer which are stacked in sequence, or may be a stack structure of more layers, which are used to protect the light-emitting layer  50  by preventing water and oxygen from entering the light-emitting layer  50  and causing failure of the light-emitting material of the light-emitting layer  50 . 
     An embodiment of the present application also provides a display device, which includes the display panel of one of the foregoing embodiments and other devices such a circuit board bound to the display panel, a cover plate covering the display panel, and the like. 
     According to the above embodiment, 
     the present application provides a display panel, a manufacturing method thereof, and a display device; the array substrate of the display panel is provided with a plurality of first electrodes, first intervals and second intervals are defined between the plurality of first electrodes, a plurality of first pixel banks are arranged corresponding to the first intervals, and a plurality of second pixel banks are arranged corresponding to the second intervals, wherein the second pixel banks cross over the first pixel banks, a thickness of each of the first pixel banks and the second pixel banks is greater than a thickness of the first electrodes, and the thickness of the second pixel banks is greater than the thickness of the first pixel banks, so that the light-emitting materials of a same color can be continuously printed between adjacent ones of the second pixel banks, which solves the problem that the pixel definition layer of the existing SBS-type design cannot be continuously printed, thus impacting printing efficiency. Meanwhile, the first pixel banks are made of a hydrophilic organic material, which can quickly disperse the printed light-emitting materials in areas defined by the first pixel banks, thereby improving the printing efficiency; and the second pixel banks are made of a hydrophobic organic material to prevent the printed light-emitting materials from overflowing and causing color mixing. 
     In the above embodiments, the descriptions of each embodiment have their own emphasis. The parts that are not described in detail in an embodiment can be referred to the detailed descriptions in other embodiments above, which will not be repeated herein for brevity in for brevity. 
     The present application has been described in detail above. Specific examples are used in this document to explain the principles and implementation of the present invention. The descriptions of the above embodiments are only for understanding the method of the present invention and its core ideas, to help understand the technical solution of the present application and its core ideas, and a person of ordinary skill in the art should understand that it can still modify the technical solution described in the foregoing embodiments, or equivalently replace some of the technical features. Such modifications or replacements do not deviate from the spirit of the corresponding technical solutions beyond the scope of the technical solutions of the embodiments of the present application.