Display panel, preparation method thereof and display device

Abstract

Embodiments of the present disclosure provide a display panel, a manufacturing method thereof, and a display device. The display panel includes a substrate and a pixel definition layer. The pixel definition layer includes a plurality of first barrier wall portions, a plurality of second barrier wall portions, and a third barrier wall portion. The first barrier wall portions extend along a first direction and are arranged along a second direction. The second barrier wall portions extend along the second direction and are arranged along the first direction. The plurality of first barrier wall portions and the plurality of second barrier wall portions intersect to define a plurality of openings. The third barrier wall portion is located between two adjacent second barrier wall portions and on a side of the first barrier wall portion away from the substrate. The height of the second barrier wall portion and the third barrier wall portion relative to the substrate is greater than the height of the first barrier wall portion relative to the substrate. The size of the third barrier wall portion in the first direction is less than the size of the opening in the first direction. The technical solution of the present disclosure can improve the problem of uneven film thickness during inkjet printing.

Description

Technical Field

[0001] This disclosure relates to the field of display device technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) is a new type of light-emitting device. Compared with liquid crystal displays, it has advantages such as self-illumination, fast response, wide viewing angle, high brightness, vivid colors, and thinness, and has broad application prospects in the display field.

[0003] Among related technologies, inkjet printing for OLED fabrication offers advantages such as fast film formation speed, high material utilization, and the ability to manufacture large-size OLEDs. However, with the increasing popularity of high-resolution products, limitations in inkjet printing accuracy and hardware conditions result in poor film uniformity and a tendency to produce display defects when using inkjet printing to fabricate OLEDs. Summary of the Invention

[0004] This disclosure provides a display panel and its manufacturing method, as well as a display device, to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the present disclosure, the present disclosure provides a display panel, including a substrate and a pixel definition layer. The pixel definition layer is disposed on the substrate and includes a plurality of first barrier portions and a plurality of second barrier portions. The first barrier portions extend along a first direction, the plurality of first barrier portions are arranged along a second direction, the second barrier portions extend along the second direction, the plurality of second barrier portions are arranged along the first direction, and the plurality of first barrier portions and the plurality of second barrier portions intersect each other to define a plurality of openings.

[0006] The pixel definition layer further includes a third barrier portion, the orthographic projection of the third barrier portion on the substrate is located within the orthographic projection range of the first barrier portion on the substrate, the third barrier portion is located between two adjacent second barrier portions, and the distance between the side of the second barrier portion away from the substrate and the substrate, and the distance between the side of the third barrier portion away from the substrate and the substrate are both greater than the distance between the side of the first barrier portion away from the substrate and the substrate.

[0007] The dimension of the third retaining wall in the first direction is smaller than the dimension of the opening in the first direction.

[0008] In some possible implementations, a first channel is provided between the third barrier portion and at least one of the two adjacent second barrier portions, the first channel being used to allow the luminescent layer solution located in the openings on both sides of the third barrier portion to communicate through the first channel.

[0009] In some possible implementations, one of the two adjacent second retaining wall portions is connected to the third retaining wall portion, the first channel is located between the third retaining wall portion and the other of the two second retaining wall portions, the width of the first channel is 1 / 6 to 4 / 5 of the size of the opening in the first direction, and the width of the first channel is the size of the first channel in the first direction.

[0010] In some possible implementations, along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area;

[0011] From the edge of the second display area near the first display area toward the edge away from the first display area, the width of the plurality of first channels gradually decreases, and the width of the first channel is the size of the first channel in the first direction.

[0012] In some possible implementations, within the same second display area, in the second direction, the distance between any two adjacent third retaining wall portions is equal.

[0013] In some possible implementations, along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area;

[0014] The multiple first channels within the same second display area have equal dimensions in the first direction, and the distance between each two adjacent third retaining wall portions gradually decreases from the edge of the second display area near the first display area toward the edge away from the first display area.

[0015] In some possible implementations, along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area;

[0016] The multiple first channels within the same second display area are of equal size in the first direction, and the distance between each two adjacent third retaining wall portions is equal.

[0017] In some possible implementations, along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the first display area;

[0018] The plurality of first channels within the first display area are of equal size in the first direction, and the distance between each pair of adjacent third retaining wall portions is equal.

[0019] In some possible implementations, the second display area includes at least 100 of the openings along the second direction.

[0020] In some possible implementations, the edge of the orthographic projection of the third retaining wall portion onto the substrate extending in the second direction coincides with the edge of the orthographic projection of the first retaining wall portion onto the substrate extending in the second direction.

[0021] In some possible implementations, the pixel definition layer further includes two edge blocking portions, which are respectively disposed on the side of the first blocking portion on both sides of the second direction away from the substrate.

[0022] In some possible implementations, the distance between the side of the edge retaining wall portion away from the substrate and the substrate, the distance between the side of the second retaining wall portion away from the substrate and the substrate, and the distance between the side of the third retaining wall portion away from the substrate and the substrate are all equal.

[0023] In some possible implementations, the distance between the side of the first barrier portion facing away from the substrate and the substrate is 0.3μm-0.7μm, and the distance between the side of the second barrier portion and the third barrier portion facing away from the substrate and the substrate is 0.9μm-1.3μm.

[0024] In some possible implementations, the material of the first barrier portion includes a hydrophilic material, and the materials of the second barrier portion and the third barrier portion both include a hydrophobic material.

[0025] As a second aspect of this disclosure, this disclosure provides a method for manufacturing a display panel.

[0026] A plurality of first barrier portions are formed on the substrate, the first barrier portions extending along a first direction, and the plurality of first barrier portions being arranged along a second direction;

[0027] A plurality of second and third baffle portions are formed on the substrate, wherein the second baffle portions extend along the second direction and the plurality of second baffle portions are arranged along the first direction;

[0028] The plurality of first and second barrier portions intersect to define a plurality of openings. The orthographic projection of the third barrier portion on the substrate is located within the orthographic projection range of the first barrier portion on the substrate. The third barrier portion is located between two adjacent second barrier portions. The distance between the side of the second barrier portion away from the substrate and the substrate, and the distance between the side of the third barrier portion away from the substrate and the substrate, are both greater than the distance between the side of the first barrier portion away from the substrate and the substrate.

[0029] The dimension of the third retaining wall in the first direction is smaller than the dimension of the opening in the first direction.

[0030] In some possible implementations, it also includes,

[0031] The solution for inkjet printing the light-emitting layer along the second direction is interconnected between the solutions of the light-emitting layer between two adjacent first barrier portions.

[0032] The solution of the light-emitting layer is dried to form the light-emitting layer.

[0033] As a third aspect of the present disclosure, the present disclosure provides a display device including the display panel described in the first aspect embodiment.

[0034] The following beneficial effects can be obtained by adopting the above technical solution in the embodiments of this disclosure: the technical solution of the embodiments of this disclosure can improve the uniformity of the printed film, improve edge defects, thereby improving the life and quality of the display panel.

[0035] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0036] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments according to this disclosure and should not be construed as limiting the scope of this disclosure.

[0037] Figure 1 This is a schematic diagram of the pixel definition layer structure in related technologies;

[0038] Figure 2 for Figure 1 Schematic diagram of the FF section in the diagram;

[0039] Figure 3 for Figure 1 Schematic diagram of the EE section in the diagram;

[0040] Figure 4 This is a schematic diagram of the pixel definition layer of the display panel according to Embodiment 1 of this disclosure;

[0041] Figure 5 for Figure 4 A schematic diagram of the CC section;

[0042] Figure 6 This is a schematic diagram of the pixel definition layer of the display panel in Embodiment 2 of this disclosure;

[0043] Figure 7 This is a schematic diagram of the pixel definition layer of the display panel in Embodiment 3 of this disclosure;

[0044] Figure 8 This is a schematic diagram of the pixel definition layer structure of the second display area in Embodiment 1 of this disclosure;

[0045] Figure 9 This is a schematic diagram of the pixel definition layer structure of the second display area in Embodiment 2 of this disclosure;

[0046] Figure 10 This is a schematic diagram of the pixel definition layer structure of the second display area in Embodiment 3 of this disclosure;

[0047] Figure 11 This is a schematic diagram of the pixel definition layer structure of the first display area according to an embodiment of the present disclosure;

[0048] Figure 12 This is a schematic diagram of the pixel definition layer structure of the first and second display areas of the display panel disclosed herein.

[0049] Explanation of reference numerals in the attached figures:

[0050] X, first direction; Y, second direction;

[0051] K, opening; D, first channel;

[0052] AA, First display area; BB, Second display area;

[0053] 100. Substrate; 200. Pixel definition layer;

[0054] 210. First retaining wall section; 220. Second retaining wall section; 230. Third retaining wall section; 240. Edge retaining wall section. Detailed Implementation

[0055] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure, and different embodiments can be combined arbitrarily without conflict. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0056] The main film deposition methods for OLED devices include vapor deposition and solution deposition. Currently, vapor deposition is a relatively mature process for small-size OLED device fabrication, and the technology is already in mass production. However, vapor deposition materials are expensive, and material utilization is low due to limitations in mask precision, resulting in high product development costs and making it difficult to fabricate large-size OLED devices. Solution deposition methods for OLED devices mainly include inkjet printing, nozzle coating, spin coating, and screen printing. Among these, inkjet printing is increasingly becoming a research hotspot due to its fast deposition speed, high material utilization, and ability to fabricate large-size OLED devices.

[0057] As the resolution of OLED devices increases, the number of openings required in the pixel definition layer on a substrate of the same size increases significantly, while the size of these openings becomes increasingly smaller. Differences in solution drying rates across different opening regions can easily lead to uneven film formation. For example, during the drying process of the emissive layer solution, the solution at the edge of the opening dries faster than that in the center, resulting in a pronounced "coffee ring" effect—thicker at the edges and thinner in the center—leading to a continuous decrease in film uniformity within the openings, thus affecting product lifespan and quality. In inkjet printing, limitations in the printer head hardware, such as printhead precision, make it difficult to ensure accurate solution dripping. Furthermore, the stability of each nozzle cannot guarantee a consistent volume of solution ejected into each opening. Even with hybrid printing algorithms, uneven display and other display defects cannot be avoided. Additionally, the higher the resolution of the product and the higher the printing precision requirements, the more stringent the design requirements become for the short side and Y-direction of the sub-pixels.

[0058] Figure 1 This is a schematic diagram of the pixel definition layer structure in related technologies. Figure 2 for Figure 1 Schematic diagram of the FF section in the diagram. Figure 3 for Figure 1 A schematic diagram of the EE section. (See attached diagram.) Figure 1 , Figure 2 and Figure 3As shown, the display panel of the related technology includes a substrate and a pixel definition layer 200. The pixel definition layer 200 includes a plurality of first barrier portions 210, a plurality of second barrier portions 220, and an edge barrier portion 240. The first barrier portions 210 extend along a first direction X, and the plurality of first barrier portions 210 are arranged along a second direction Y. The second barrier portions 220 extend along the second direction Y, and the plurality of second barrier portions 220 are arranged along the first direction X. The edge barrier portion 240 is located at the two side edges of the barrier portions 210 arranged along the second direction, and the edge barrier portion 240 extends along the first direction X. The dimension of the edge barrier portion 240 in the direction perpendicular to the substrate is equal to the dimension of the second barrier portion 220 in the direction perpendicular to the substrate. The plurality of first barrier portions 210 and the plurality of second barrier portions 220 intersect to define a plurality of openings K. The light-emitting layer solution material of the openings K located between adjacent second barrier portions 220 can flow to each other, that is, the solution material of each column of sub-pixels of the same color can flow to each other. In this way, the solution material in each column of subpixels is averaged, thereby reducing the volume difference of solution in subpixels of the same color in the same column, improving the uniformity of the printed film, and reducing the need for printer precision.

[0059] During the development of the line bank structure in related technologies, researchers discovered that the pixel definition layer has high requirements for the fluidity of the printing substrate and is limited by the hydrophilic material of the pixel definition layer, resulting in limited ink flow. Furthermore, for the line bank structure of high-resolution OLED devices, inkjet printing produces smaller droplets with weaker fluidity, and the thickness cannot be made thinner due to the significant differences in the uniformity of the hydrophilic pixel definition layer thickness. In related technologies, planarization cannot be achieved if the line bank structure is manufactured using inorganic chemical vapor deposition (CVD); and thinner layers (0.1μm-0.3μm) cannot be fabricated using resin or acrylic development methods. For example, taking positive photoresist as an example, if a single-layer line bank is used, excessive exposure will cause the entire layer to disappear, while insufficient exposure will result in excessive thickness. Furthermore, the uniformity of the barrier structure cannot be guaranteed. Due to limitations of the coating machine and the influence of exposure uniformity, the thinner the barrier structure, the worse the uniformity, which easily leads to printing unevenness (mura) during inkjet printing. If the thickness of the hydrophilic barrier structure is too thin and the flowability is too good, during the drying process, due to the edges drying too quickly and the flatness of the printing table, the ink droplets will flow to one side, resulting in edge mura. Moreover, during the printing process, when the volume of the ink droplets is less than a certain amount, the ink droplets will shrink from the edges to the center, resulting in edge mura.

[0060] To address the issues of uneven film formation and poor edge quality during inkjet printing in related technologies, this disclosure provides a display panel. The technical solution of this disclosure is described in detail below through embodiments.

[0061] Figure 4 This is a schematic diagram of the pixel definition layer of the display panel provided in an embodiment of the present disclosure. Figure 5 for Figure 4 A schematic diagram of the CC section. (See attached diagram.) Figure 4 and Figure 5 As shown in the figure, a display panel provided in this embodiment includes a substrate 100 and a pixel definition layer 200.

[0062] A pixel definition layer 200 is disposed on a substrate 100. The pixel definition layer 200 includes a plurality of first barrier portions 210 and a plurality of second barrier portions 220. The first barrier portions 210 extend along a first direction X and the plurality of first barrier portions 210 are arranged along a second direction Y. The second barrier portions 220 extend along the second direction Y and the plurality of second barrier portions 220 are arranged along the first direction X. The plurality of first barrier portions 210 and the plurality of second barrier portions 220 intersect each other to define a plurality of openings K.

[0063] The pixel definition layer 200 also includes a third barrier portion 230. The orthographic projection of the third barrier portion 230 on the substrate 100 is located within the orthographic projection range of the first barrier portion 210 on the substrate 100. The third barrier portion 230 is located between two adjacent second barrier portions 220. The distance between the side of the second barrier portion 220 away from the substrate 100 and the substrate 100, and the distance between the side of the third barrier portion 230 away from the substrate 100 and the substrate 100, are both greater than the distance between the side of the first barrier portion 210 away from the substrate 100 and the substrate 100.

[0064] The dimension of the third retaining wall portion 230 in the first direction X is smaller than the dimension of the opening K in the first direction X.

[0065] In related technical solutions, the light-emitting layer solution material in the opening K between adjacent second barrier portions 220 can circulate with each other, that is, the solution material of each column of sub-pixels of the same color can circulate with each other. In this way, due to the hydrophilicity of the first barrier portion 210, the solution material of the same column of sub-pixels of the same color has too good fluidity. During the drying process, due to the flatness of the machine and the surface energy of the ink, the solution material of the same column of sub-pixels of the same color diffuses to the edges or shrinks to the middle, resulting in severe mura. In the embodiment of this disclosure, a third barrier portion 230 is provided between adjacent second barrier portions 220. The size of the third barrier portion 230 in the first direction X is smaller than the size of the opening K in the first direction X. This facilitates the formation of a first channel D between two adjacent second barrier portions 220, and the light-emitting layer solution in the opening K on both sides of the third barrier portion 230 can circulate with each other through the first channel D. In this structure, the solution material of the same column and color sub-pixels can flow together. The third baffle 230 can block and alleviate the flow of solution material, changing the flowability of solution material in different states. Thus, during printing, when the flowability of solution material is good, the same column and color sub-pixels can have good flowability, ensuring uniformity of ink droplet volume. During the drying process, the third baffle 230 can block and alleviate the flow of solution material, reducing the flowability of solution material during the drying process, preventing solution material from diffusing to the edges or shrinking to the center, reducing overflow and drying mura caused by ground state flatness issues, improving the uniformity of the light-emitting layer film thickness, and improving the display effect.

[0066] For example, the dimensions of the first barrier portion 210 along the first direction (horizontal direction) and the second barrier portion 220 along the second direction (vertical direction) can be set according to actual usage requirements. Multiple first barrier portions 210 and multiple second barrier portions 220 divide multiple openings K for defining the light-emitting layer. Each opening K defines a sub-pixel, and the light-emitting layer corresponding to the sub-pixel can be located at the opening K. The light-emitting layer can be various film layers in the OLED device. For example, the light-emitting layer can include at least one of the following film layers stacked together: a hole injection layer, a hole transport layer, an electron blocking layer, an organic light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0067] It should be noted that the distance between the side of the second barrier portion 220 facing away from the substrate 100 and the substrate 100, and the distance between the side of the third barrier portion 230 facing away from the substrate 100 and the substrate 100, are both greater than the distance between the side of the first barrier portion 210 facing away from the substrate 100 and the substrate 100. That is, the height of the second barrier portion 220 along the direction perpendicular to the substrate 100 and the height of the third barrier portion 230 along the direction perpendicular to the substrate 100 are greater than the height of the first barrier portion 210 along the direction perpendicular to the substrate 100. In other words, the height of the first barrier portion 210 is smaller, and the first barrier portion 210 is hydrophilic. The height of the second barrier portion 220 and the third barrier portion 230 is larger, and the second barrier portion 220 and the third barrier portion 230 are hydrophobic. Thus, during inkjet printing, the flow of the light-emitting layer solution of the adjacent second barrier portions 220 along both sides of the second direction Y can be ensured, while avoiding the mixing of solutions in the two adjacent openings K along the first direction X.

[0068] It should be noted that during inkjet printing, inkjet printing can be performed along the second direction Y. Openings K in the same column along the second direction Y can print the same color of the luminescent layer solution, while adjacent openings K in the first direction X can print different colors of luminescent layer solutions, thus achieving color display. During inkjet printing along the second direction, the luminescent layer solution can flow along the second direction towards two adjacent openings K. This allows the solutions within different openings K to diffuse into each other along the openings in the same column, forming a uniform film. However, two adjacent openings K along the first direction X are separated by the second baffle portion 220, preventing the solutions from diffusing and contacting each other, thereby preventing color mixing issues.

[0069] The display panel of this embodiment features a third baffle portion 230. The orthographic projection of the third baffle portion 230 onto the substrate 100 falls within the orthographic projection range of the first baffle portion 210 onto the substrate 100. The third baffle portion 230 is located between two adjacent second baffle portions 220. The size of the third baffle portion 230 in the first direction X is smaller than the size of the opening K in the first direction X. This facilitates the formation of a first channel D between two adjacent second baffle portions 220. By setting different values ​​for the size of the third baffle portion 230, the size of the through area (i.e., the first channel D) formed between adjacent openings K in the same column can be set to different values. This arrangement allows the light-emitting layer solution between two adjacent openings K along the second direction to flow during inkjet printing, averaging the light-emitting layer solution flowing into the opening K. This reduces the volume difference of the light-emitting layer solution within the openings K in the same column, improves the uniformity of the printed film, and thus improves product lifespan and quality. Simultaneously, it reduces the requirements for printer precision and decreases color bleeding and thin dark lines during printing. At the same time, this setting can change the flowability of the light-emitting layer solution under different states, ensuring the fluidity of the light-emitting layer solution during printing and reducing the flowability of the light-emitting layer solution during drying. This reduces the overflow caused by machine flatness issues and the difference in drying rate between different areas, which can lead to the light-emitting layer solution flowing to one side. This improves the problem of uneven film formation caused by the difference in drying rate between different areas in the same column, increases the process window for solution drying, and improves the adjustment space for printing process window and device. It can be applied to the mass production of large-size OLED devices.

[0070] Reference Figure 4 One end of the third retaining wall portion 230 can be connected to one of the two adjacent second retaining wall portions 220, and the other end of the third retaining wall portion 230 is spaced apart from the other of the two adjacent second retaining wall portions 220. The third retaining wall portion 230 and one of the two adjacent second retaining wall portions 220 form a first channel D. The number of first channels D is one. The difference between the size of the opening K in the first direction X and the size of the third retaining wall portion 230 in the first direction X is the width of the first channel D, that is, the size of the first channel D in the first direction X.

[0071] Reference Figure 6 Both ends of the third retaining wall portion 230 can be spaced apart from the two adjacent second retaining wall portions 220. A first channel D is formed between the third retaining wall portion 230 and the two adjacent second retaining wall portions 220. There are two first channels D. The difference between the size of the opening K in the first direction X and the size of the third retaining wall portion 230 in the first direction X is the width of the two first channels D.

[0072] Reference Figure 7Each of the two adjacent second retaining wall portions 220 is connected to a third retaining wall portion 230, and a first channel D is formed between the two third retaining wall portions 230. The number of first channels D is one. The dimension of the third retaining wall portion 230 in the first direction X is the sum of the dimensions of the two third retaining wall portions 230 located between the two adjacent second retaining wall portions 220 in the first direction X.

[0073] It should be noted that the above methods all enable the dimension of the third retaining wall portion 230 in the first direction X to be smaller than the dimension of the opening K in the first direction X. The structure of the third retaining wall portion 230 located between adjacent second retaining wall portions 220 along the second direction can adopt one or more combinations of the above.

[0074] Reference Figure 4 and Figure 6 In some embodiments, a first channel D is provided between the third baffle portion 230 and at least one of the two adjacent second baffle portions 220. The first channel D allows the light-emitting layer solution located in the openings K on both sides of the third baffle portion 230 to communicate through the first channel D. The first channel D is formed by the third baffle portion 230 and the second baffle portion 220, allowing the light-emitting layer solution in the openings K on both sides of the third baffle portion 230 to flow between them. Different dimensions of the first channel D in the first direction X can change the flowability of the light-emitting layer solution in different states, ensuring the fluidity of the light-emitting layer solution during printing.

[0075] It should be noted that a first channel D is provided between the third retaining wall portion 230 and at least one of the two adjacent second retaining wall portions 220. The third retaining wall portion 230 may have a first channel D with the second retaining wall portion 220 on the left, or the second retaining wall portion 230 may have a first channel D with the second retaining wall portion 220 on the right, or the second retaining wall portion 230 may have a first channel D between it and both of the two adjacent second retaining wall portions 220.

[0076] Reference Figure 4 and Figure 5 As shown, in some of the disclosed embodiments, one of the two adjacent second retaining wall portions 220 is connected to the third retaining wall portion 230, and the first channel D is located between the third retaining wall portion 230 and the other of the two second retaining wall portions 220, thus forming a first channel D with good flowability. The ratio of the width of the first channel D to the dimension of the opening K in the first direction X is 1 / 6 to 4 / 5, and the width of the first channel D is the dimension of the first channel D in the first direction X. When both the third retaining wall portion 230 and the two adjacent second retaining wall portions 220 have channels, the width of the first channel D can be expressed as the sum of the dimensions of the two sub-channels in the first direction X.

[0077] It should be noted that the ratio of the width of the first channel D to the size of the opening K in the first direction X is 1 / 6 to 4 / 5. For example, the ratio of the width of the first channel D to the size of the opening K in the first direction X can be 1 / 6, 1 / 5, 2 / 5, 1 / 4, 4 / 5, etc. Different ratios can be set according to the characteristics of different solutions, thereby forming a first channel with different through widths along the first direction. This changes the flowability of the solution in different states, ensuring that the solution volume is uniform during printing and reducing the flowability of the through area during drying. Ultimately, this improves problems such as overflow caused by machine flatness and uneven film thickness caused by differences in drying rate.

[0078] For example, the size of the opening K in the first direction X can be determined by the spacing between adjacent second barrier portions 220. The size of the opening K is determined by the resolution of the display panel. The ratio of the width of the first channel D to the size of the opening K in the first direction X is 1 / 6 to 4 / 5. That is, the ratio of the size of the third barrier portion 230 in the first direction to the size of the opening K in the first direction is 1 / 5 to 5 / 6. In other words, the size of the first channel D in the first direction can be defined by the size of the third barrier portion 230 in the first direction.

[0079] Reference Figure 4 As shown, in some embodiments, the edge of the orthographic projection of the third baffle portion 230 on the substrate 100 extending along the second direction Y coincides with the edge of the orthographic projection of the first baffle portion 210 on the substrate 100 extending along the second direction Y. That is, the size of the third baffle portion 230 along the second direction Y is equal to the size of the first baffle portion 210 along the second direction Y. This can reduce the influence of the third baffle portion 230 on the opening K, reduce the area of ​​the light-emitting layer solution on the first baffle portion 210, and thus reduce material waste.

[0080] Reference Figure 12 In some of the disclosed embodiments, along the second direction Y, the display area of ​​the display panel includes a first display area AA located in the center and second display areas BB located on both sides of the first display area AA, with the third baffle portion 230 located in the second display area BB. The specific sizes of the first display area AA and the second display area BB are not limited here. The second display area BB is located on both sides of the first display area AA, and the solutions in the openings of the second display area BB and the first display area AA located in the same column along the second direction can diffuse and flow between them. The second display area BB can be an edge region, and the first display area AA can be a central region.

[0081] Reference Figure 12For example, the pixel definition layer 200 further includes two edge baffle portions 240. The two edge baffle portions 240 are respectively disposed on the side of the first baffle portion 210 away from the substrate 100 on both sides of the second direction Y. The distance between the side of the edge baffle portion 240 away from the substrate 100 and the substrate 100, the distance between the side of the second baffle portion 220 away from the substrate 100 and the substrate 100, and the distance between the side of the third baffle portion 230 away from the substrate 100 and the substrate 100 are all equal. That is, the height of the edge baffle portion 240 in the direction perpendicular to the substrate 100, the height of the third baffle portion 230 in the direction perpendicular to the substrate 100, and the height of the edge baffle portion 240 in the direction perpendicular to the substrate are all equal. This allows the second baffle portion 220 to prevent solution diffusion between adjacent openings in the first direction, and the edge baffle portion 240 to prevent solution overflow at both sides of the second direction from causing edge defects.

[0082] It should be noted that the edge retaining wall portion 240 can be formed using a liquid-repellent material, and the edge retaining wall portion 240 can be formed together with the second retaining wall portion 220 and the third retaining wall portion 230 through a single patterning process.

[0083] For example, the second display area BB includes at least 100 openings K along the second direction Y, that is, at least 100 rows of subpixels are provided in the second display area BB.

[0084] Reference Figure 9 In some embodiments, the width of a plurality of first channels D gradually decreases from the edge of the second display area BB near the edge of the first display area AA toward the edge away from the first display area AA. The width of the first channel D is its dimension in the first direction X. The width of the first channel D gradually decreases along the direction near the edge baffle 240, and the width of the first channel D is equal to 1 / 6 to 4 / 5 of the dimension of the opening K in the first direction. The first display area AA can be fully through, that is, the first display area AA may not have the third baffle 230. By setting the width of the first channel D to gradually decrease along the direction near the edge baffle 240, the flowability of the solution during drying can be gradually reduced along the direction near the edge baffle 240. As the solution volume decreases during drying, the flowability of the first channel can be reduced, thereby reducing the edge mura, and at the same time, the uniformity of film thickness distribution can be improved.

[0085] For example, the third barrier portion 230 of the second display area BB has a dimension d1 along the first direction X, and the spacing between adjacent third barrier portions 230 of the second display area BB along the second direction Y is d2. In this embodiment of the disclosure, d2 is fixed, and d1 gradually increases along the direction close to the edge barrier portion 240, thereby causing the width of the first channel D to gradually decrease.

[0086] For example, the opening K has a dimension of W in the first direction, and the width of the first channel D can gradually decrease along the edge retaining wall 240. For example, the width of the first channel D can be 1 / 6W-1 / 5W-1 / 4W-1 / 3W. The closer to the edge retaining wall 240, the smaller the width of the first channel D.

[0087] It should be noted that the width of the first channel D can gradually decrease along the direction near the edge retaining wall 240, and in the second direction Y, the distance between any two adjacent third retaining wall portions 230 can be equal or unequal. For example, within the same second display area BB, the distance between any two adjacent third retaining wall portions 230 in the second direction Y is equal. The same second display area BB can refer to the second display area BB located on the same side of the first display area AA. The equal distance between any two adjacent third retaining wall portions 230 means that the first channel D can have a fixed number of rows between them. For example, the number of rows between any two adjacent third retaining wall portions 230 can be fixed at 5 rows. The first channel D becomes narrower closer to the edge retaining wall 240, and the width of the first channel D can be 1 / 6W-1 / 5W-1 / 4W-1 / 3W. Alternatively, the number of rows between any two adjacent third baffle sections 230 can be fixed at 10. The first channel D becomes narrower as it approaches the edge baffle section 240, and the width of the first channel D can be 1 / 6W-1 / 5W-1 / 4W-1 / 3W. This configuration of the first channel D allows for good flow of inkjet printing solution during printing, while reducing flow during drying, thus better mitigating edge mura issues.

[0088] It should be noted that, in the second direction Y, the distance between any two adjacent third retaining wall portions 230 can be set as needed and is not limited here. The extent to which the width of the first channel D decreases along the direction near the edge retaining wall portion 240 can be set according to actual usage requirements.

[0089] Reference Figure 8As shown, in some embodiments, multiple first channels D within the same second display area BB have equal dimensions in the first direction X. The width of the first channel D is equal to 1 / 6 to 4 / 5 of the dimension of the opening K in the first direction. From the edge of the second display area BB near the first display area AA towards the edge away from the first display area AA, the distance between every two adjacent third baffle portions 230 gradually decreases. That is, the dimension of the third baffle portion 230 within the second display area BB in the first direction is set to a constant value, and the distance between every two adjacent third baffle portions 230 gradually decreases in the second direction from the edge of the second display area near the first display area AA towards the edge baffle portion 240. This improves the edge mura problem by setting the density between the third baffle portions 230. The closer the second display area BB is to the edge baffle portion 240, the smaller the distance between adjacent third baffle portions 230 becomes, resulting in a smaller spacing density of the third baffle portions 230. This allows for good solution flow during inkjet printing and reduced solution flow during drying, thus better improving the edge mura problem.

[0090] For example, the third barrier portion 230 of the second display area BB has a dimension d1 along the first direction X, and the spacing between adjacent third barrier portions 230 of the second display area BB along the second direction Y is d2. In this embodiment of the disclosure, d1 is fixed, and d2 gradually decreases along the direction close to the edge barrier portion 240.

[0091] Reference Figure 10 As shown, in some embodiments, the dimensions of multiple first channels D within the same second display area BB are equal in the first direction X, and the distance between any two adjacent third baffle portions 230 is equal. The width of the first channel D is equal to 1 / 6 to 4 / 5 of the dimension of the opening K in the first direction. That is, by ensuring that the dimensions of the first channels D in the first direction and the spacing between adjacent first channels D in the second direction are equal within the second display area BB, good solution flowability can be achieved during inkjet printing, reduced solution flowability during drying, and improved film thickness uniformity can also be achieved. The width of the first channel D and the distance between adjacent first channels D in the second direction can be set according to actual usage requirements.

[0092] For example, the third barrier portion 230 of the second display area BB has a dimension d1 along the first direction X, and the spacing between adjacent third barrier portions 230 of the second display area BB along the second direction Y is d2. In this embodiment of the disclosure, d1 is fixed and d2 is fixed.

[0093] Reference Figure 11As shown, in some embodiments, the plurality of first channels D within the first display area AA have equal dimensions in the first direction X, and the distance between each pair of adjacent third baffle portions 230 is equal. By setting the first channels D of the same size within the first display area AA and setting the distance between each pair of adjacent third baffle portions 230 to be equal, the film thickness uniformity of the first display area AA can be improved.

[0094] For example, the third barrier portion 230 of the second display area AA has a dimension d3 along the first direction X, and the adjacent third barrier portions 230 of the second display area AA have a spacing distance d4 along the second direction Y. In this embodiment of the disclosure, d3 is fixed and d4 is fixed.

[0095] For example, the size of the first channel D in the first display area AA can be 1 / 6 to 4 / 5 of the size of the opening K in the first direction. One or two third baffle portions 230 can be set at fixed intervals in the first display area AA, for example, at intervals of 5-10 rows, thereby forming one or two narrow channels to improve the uniformity of film thickness.

[0096] Reference Figure 12 As shown, in some of the disclosed embodiments, a third baffle portion 230 of fixed size is provided in the first display area AA, and adjacent third baffle portions 230 are set at a fixed distance. At the same time, a third baffle portion 230 of fixed size and adjacent third baffle portions 230 can also be provided in the second display area BB, or a third baffle portion 230 of fixed size is provided in the second display area BB, and the distance between adjacent third baffle portions 230 gradually decreases along the direction near the edge baffle portion 240, or the distance between adjacent third baffle portions 230 is fixed, and the size of the third baffle portion 230 gradually decreases along the direction near the edge baffle portion 240. In this way, the problems of improving film thickness uniformity and improving edge mura can be achieved simultaneously.

[0097] Exemplarily, substrate 100 may include a substrate and a driving structure layer formed on the substrate. Substrate 100 mainly serves as a support and driving element. The shape of substrate 100 can be adapted to the shape of the display panel. Exemplarily, the shape of substrate 100 can be square or rectangular, or it can be circular or other shapes, or it can be irregular. The specific shape of substrate 100 is not limited here. The substrate can be made of any suitable material suitable for the specific structure of the display panel. Exemplarily, when applied to a non-transparent display, the substrate can be made of a non-transparent material; when applied to a transparent display, the substrate can be made of a transparent material such as glass or transparent resin; when applied to a flexible display, the substrate can be made of a flexible resin or other material. The material of the substrate is not limited here. The driving structure layer is located on one side of the substrate and can be used to provide driving signals. The driving structure layer may include pixel circuits with multiple signal lines, thin-film transistors, resistors, and capacitors to achieve driving. The specific structure of the driving structure layer can be set according to actual usage requirements and is not limited here.

[0098] Exemplarily, the display panel further includes multiple light-emitting units arranged in an array. Each light-emitting unit includes a first electrode, a second electrode, and a light-emitting structure layer located between the first and second electrodes. The light-emitting structure layer is disposed within an opening K, and the same light-emitting structure layer is disposed within multiple openings located in the region between two adjacent second barrier portions 220. The first electrode is disposed on the side of the light-emitting layer near the substrate 100, and the second electrode is disposed on the side of the light-emitting layer away from the substrate 100. Different voltage driving signals are input to the first and second electrodes respectively, thereby generating an electric field between the first and second electrodes, and the light-emitting layer can emit light under the action of the electric field. Exemplarily, the first electrode can be an anode, and the second electrode can be a cathode, or the first electrode can be a cathode and the second electrode can be an anode. It should be noted that the light-emitting structure layer may include a hole injection layer, a light-emitting layer, an electron transport layer, and an electron injection layer stacked together. The light-emitting structure layer may also have film layer structures such as a hole blocking layer, an electron blocking layer, and a hole transport layer, which are not limited here.

[0099] For example, in some disclosed embodiments, the display panel may include light-emitting units of the same color, thereby enabling single-screen display. Alternatively, the display panel may also include light-emitting units of multiple light-emitting colors, such as red, blue, and green light-emitting units, thereby enabling color screen display. In this disclosed embodiment, the same light-emitting structure layer is provided in multiple openings between adjacent second barrier portions 220, which means that the light-emitting units in the area between two adjacent second barrier portions 220 are light-emitting units of the same color, that is, the light-emitting structure layers in multiple openings located in the same column along the second direction Y are of the same color.

[0100] In some of the disclosed embodiments, the light-emitting layer solutions between two adjacent first baffle portions 210 are interconnected. During inkjet printing, the same color of light-emitting layer solution is printed in the same column of openings K in the second direction Y, and different colors of light-emitting layer solutions are printed in adjacent openings K in the first direction X, thereby enabling color display. For example, a red, blue, and green light-emitting layer are provided along the first direction X. Along the second direction Y, the same color of light-emitting layer solution is printed through the nozzle of the inkjet printer into the same column of openings K located between adjacent second baffle portions 220, and can cover the surface of the first baffle portions 210 located between adjacent second baffle portions 220. The solution within the openings between adjacent second baffle portions 220 can diffuse into each other along the second direction Y, thereby forming a uniform film layer.

[0101] Compared to inkjet printing processes in related technologies, the pixel definition layer 200 formed by the display panel in this embodiment of the present disclosure allows the light-emitting layer solutions of the same column of openings K to diffuse into each other. This reduces the precision requirements for the alignment of the printhead nozzles with the openings K during inkjet printing. Furthermore, the solutions printed by each nozzle are uniformly mixed during the flow and diffusion along the second direction Y. The uniformity of the film thickness of the light-emitting structure layer of the display panel is not affected by the different volumes of solutions printed by different nozzles. Moreover, along the first direction X, adjacent second barrier portions 220 can block the diffusion of light-emitting layer solutions of different colors, so that the solutions of adjacent columns will not come into contact with each other, thereby preventing the problem of color mixing of light-emitting layer solutions of different colors.

[0102] In some of the disclosed embodiments, the material of the first barrier portion 210 includes a hydrophilic material, and the materials of the second barrier portion 220, the third barrier portion 230, and the edge barrier portion 240 all include a hydrophobic material.

[0103] It should be noted that the first baffle portion 210 is hydrophilic, while the second baffle portion 220 and the third baffle portion 230 are hydrophobic. Hydrophilicity and hydrophobicity are relative to the same liquid medium. For example, when the liquid medium is water, hydrophilicity and hydrophobicity are hydrophilic and hydrophobic, respectively. When the liquid medium is oil, hydrophilicity and hydrophobicity are oleophilic and oleophobic, respectively.

[0104] For example, the first barrier portion 210 can be made of a hydrophilic material, and the second barrier portion 220 and the third barrier portion 230 can both be made of a hydrophobic material. The second barrier portion 220 and the third barrier portion 230 have the same dimensions along the direction perpendicular to the substrate. In this way, during inkjet printing, the flow of the light-emitting layer solution in the adjacent second barrier portion 220 along both sides of the second direction Y can be ensured, while the mixing of the light-emitting layer solutions in the two adjacent openings K along the first direction X can be avoided.

[0105] In some disclosed embodiments, a full layer of hydrophilic material can be formed on the substrate 100 firstly, and then a plurality of first barrier portions 210 can be formed through a patterning process. A full layer of hydrophobic material can then be formed on the side of the plurality of first barrier portions 210 facing away from the substrate 100. A second barrier portion 220, a third barrier portion 230, and an edge barrier portion 240 can then be formed through a patterning process, thereby ensuring that the second barrier portion 220, the third barrier portion 230, and the edge barrier portion 240 have the same height. The second barrier portion 220, the third barrier portion 240, and the edge barrier portion 240 can also be fabricated separately, without limitation. The second barrier portion 220 is formed on the substrate 100 and the hydrophilic material layer, while the edge barrier portion 240 can be formed directly on the hydrophilic material layer or directly on the substrate 100, without limitation.

[0106] In some of the disclosed embodiments, the first barrier portion 210 and the third barrier portion 230 are both made of a hydrophilic material, while the second barrier portion 220 and the edge barrier portion 240 are made of a hydrophobic material. The third barrier portion 230 can be formed in the same patterning process as the first barrier portion 210. The dimension of the third barrier portion 230 in the direction perpendicular to the substrate is larger than that of the first barrier portion 210 in the same direction perpendicular to the substrate, and the hydrophilicity of the third barrier portion 230 is between that of the first barrier portion 210 and the second barrier portion 220.

[0107] It should be noted that the different graphic settings of the third retaining wall portion 230, the first retaining wall portion 210, and the second retaining wall portion 220 in the attached drawings are only for the purpose of distinguishing the third retaining wall portion 230 from the first retaining wall portion 210 and the second retaining wall portion 220, and do not indicate that the third retaining wall portion 230 and the first retaining wall portion 210 are made of different materials, or that the third retaining wall portion 230 and the second retaining wall portion 220 are made of different materials.

[0108] It should be noted that the first barrier portion 210 is hydrophilic, while the second barrier portion 220 is hydrophobic; that is, the first barrier portion 210 has an affinity for the light-emitting layer solution, while the second barrier portion 220 has a repulsive force towards the light-emitting layer solution. When the dimension of the first barrier portion 210 in the direction perpendicular to the substrate 100 is smaller than the dimension of the second barrier portion 220 in the same direction, the inkjet printing solution exhibits better flowability. Furthermore, the flowability of the solution can be adjusted by setting the ratio of the dimension of the first barrier portion 210 in the direction perpendicular to the substrate 100 to the dimension of the second barrier portion 220 in the same direction, thereby improving the uniformity of film formation.

[0109] When the dimension of the first barrier portion 210 in the direction away from the substrate 100 is small, the planarization effect of the first barrier portion 210 formed by inorganic CVD process is poor, the resulting boundary area is uneven, the material utilization rate is low, and the isolation effect is poor. If organic resins such as resin and acrylic are used, it is impossible to achieve thinner layers (0.1μm-0.3μm) through development process. Therefore, it is particularly important to reasonably set the distance between the side of the first barrier portion 210 away from the substrate 100 and the substrate 100, and the distance between the side of the second barrier portion 220 away from the substrate 100 and the substrate 100.

[0110] For example, by controlling the thickness of the hydrophilic material layer and the hydrophobic material layer, the distance between the side of the first barrier portion 210 facing away from the substrate 100 and the substrate 100 can be 0.3μm-0.7μm, and the distance between the side of the second barrier portion 220 and the third barrier portion 230 facing away from the substrate 100 and the substrate 100 can be 0.9μm-1.3μm. That is, the height of the first barrier portion 210 is between 0.3μm and 0.7μm, and the height of the second barrier portion 220 is between 0.9μm and 1.3μm. This can ensure the fluidity of the solution, and also make full use of the solution material, thereby reducing production costs.

[0111] A method for manufacturing a display panel involves forming a plurality of first barrier portions on a substrate, wherein the first barrier portions extend along a first direction and the plurality of first barrier portions are arranged along a second direction;

[0112] A plurality of second and third baffle portions are formed on the substrate, the second baffle portions extending along a second direction and the plurality of second baffle portions being arranged along a first direction;

[0113] Among them, multiple first baffles and multiple second baffles intersect to define multiple openings, the orthographic projection of the third baffle on the substrate is within the orthographic projection range of the first baffle on the substrate, the third baffle is located between two adjacent second baffles, and the distance between the side of the second baffle away from the substrate and the substrate, and the distance between the side of the third baffle away from the substrate and the substrate are both greater than the distance between the side of the first baffle away from the substrate and the substrate.

[0114] The dimension of the third retaining wall in the first direction is smaller than the dimension of the opening in the first direction.

[0115] A method for manufacturing a display panel, comprising,

[0116] The solution for inkjet printing the light-emitting layer is connected to each other between two adjacent first barrier portions;

[0117] The solution for the luminescent layer is dried to form the luminescent layer.

[0118] The technical solution of this disclosure is further illustrated below through the fabrication process of a display panel in one embodiment. It is understood that the term "patterning" as used herein includes processes such as photoresist coating, mask exposure, development, etching, and photoresist stripping when the patterning material is inorganic or metallic; and processes such as mask exposure and development when the patterning material is organic. Evaporation, deposition, coating, and plating are all mature fabrication processes in related technologies.

[0119] Multiple first barrier portions 210 are formed on the substrate 100. The specific steps are as follows: a first pixel defining material layer is formed on the substrate 100. The first pixel defining material layer is a hydrophilic layer. The first pixel defining material layer is patterned to form the first barrier portion 210. The first barrier portion 210 extends along the first direction X, and the multiple first barrier portions 210 are arranged along the second direction Y.

[0120] Multiple second barrier portions 220 and third barrier portions 230 are formed on the substrate 100. The specific steps are as follows: A second pixel defining material layer is formed on the substrate 100 and on the side of the first barrier portion 210 facing away from the substrate 100. The second barrier portion 220 and third barrier portion 230 are formed by patterning the second pixel defining material layer. The second barrier portion 220 extends along a second direction Y, and the multiple second barrier portions 220 are arranged along a first direction X. An opening K corresponding to a sub-pixel is formed between the first barrier portion 220 and the second barrier portion 230, and the distance between the surface of the first barrier portion 210 facing away from the substrate 100 and the substrate 100 is less than that between the second barrier portion 220 and the third barrier portion 230. The distance between the surface of the barrier portion 220 facing away from the substrate 100 and the substrate 100, i.e., the dimension of the first barrier portion 210 in the direction perpendicular to the substrate 100 is smaller than the dimension of the second barrier portion 220 in the direction perpendicular to the substrate 100, and the dimension of the third barrier portion 230 in the first direction is smaller than the dimension of the opening in the first direction. A first channel D is provided between the third barrier portion 230 and at least one of the two adjacent second barrier portions 220. The first channel D is used to allow the light-emitting layer solution located in the openings on both sides of the third barrier portion 230 to communicate through the first channel D.

[0121] A light-emitting structure layer is formed within the opening K of the pixel definition layer 200. The solution of the light-emitting layer is inkjet printed along the second direction Y. The solutions of the light-emitting layer between two adjacent first barrier portions 210 are interconnected. The solution of the light-emitting layer is dried to form the light-emitting layer.

[0122] It should be noted that the dimensions of the opening K are only shown as an example in the accompanying drawings and do not limit the dimensions of the opening K. The dimensions of the opening K in the first direction X (i.e., the width of the opening K) and the dimensions in the second direction Y (i.e., the length of the opening K) can be set as needed. For example, the width of the opening K can be less than or equal to the length of the opening K, or the width of the opening K can be greater than the length of the opening K.

[0123] Based on the inventive concept of the foregoing embodiments, this disclosure also provides a display device, which includes the display panel in any embodiment of this disclosure. The display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0124] Other configurations of the display panel and display device in the above embodiments can be derived from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0125] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0126] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0127] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0128] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0129] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify this disclosure, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0130] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, include substrate; A pixel definition layer is disposed on the substrate. The pixel definition layer includes a plurality of first barrier portions and a plurality of second barrier portions. The first barrier portions extend along a first direction, the plurality of first barrier portions are arranged along a second direction, the second barrier portions extend along the second direction, the plurality of second barrier portions are arranged along the first direction, and the plurality of first barrier portions and the plurality of second barrier portions intersect each other to define a plurality of openings. The pixel definition layer further includes a third barrier portion, the orthographic projection of the third barrier portion on the substrate is located within the orthographic projection range of the first barrier portion on the substrate, the third barrier portion is located between two adjacent second barrier portions, and the distance between the side of the second barrier portion away from the substrate and the substrate, and the distance between the side of the third barrier portion away from the substrate and the substrate are both greater than the distance between the side of the first barrier portion away from the substrate and the substrate. The dimension of the third baffle portion in the first direction is smaller than the dimension of the opening in the first direction. A first channel is provided between the third baffle portion and at least one of the two adjacent second baffle portions. The first channel is used to allow the luminescent layer solution located in the openings on both sides of the third baffle portion to communicate through the first channel.

2. The display panel according to claim 1, characterized in that, One of the two adjacent second retaining wall portions is connected to the third retaining wall portion, the first channel is located between the third retaining wall portion and the other of the two second retaining wall portions, the ratio of the width of the first channel to the size of the opening in the first direction is 1 / 6 to 4 / 5, and the width of the first channel is the size of the first channel in the first direction.

3. The display panel according to claim 1, characterized in that, Along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area; From the edge of the second display area near the first display area toward the edge away from the first display area, the width of the plurality of first channels gradually decreases, and the width of the first channel is the size of the first channel in the first direction.

4. The display panel according to claim 3, characterized in that, Within the same second display area, in the second direction, the distance between any two adjacent third retaining wall portions is equal.

5. The display panel according to claim 1, characterized in that, Along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area; The multiple first channels within the same second display area have equal dimensions in the first direction, and the distance between each two adjacent third retaining wall portions gradually decreases from the edge of the second display area near the first display area toward the edge away from the first display area.

6. The display panel according to claim 1, characterized in that, Along the second direction, the display area of ​​the display panel includes a first display area located in the center and second display areas located on both sides of the first display area, and the third barrier portion is located in the second display area; The multiple first channels within the same second display area are of equal size in the first direction, and the distance between each two adjacent third retaining wall portions is equal.

7. The display panel according to claim 1, characterized in that, Along the second direction, the display area of ​​the display panel includes a first display area located in the middle and second display areas located on both sides of the first display area, and the third barrier portion is located in the first display area; The plurality of first channels within the first display area are of equal size in the first direction, and the distance between each pair of adjacent third retaining wall portions is equal.

8. The display panel according to any one of claims 3 to 7, characterized in that, The second display area includes at least 100 openings along the second direction.

9. The display panel according to claim 1, characterized in that, The edge of the orthographic projection of the third retaining wall portion on the substrate extending along the second direction coincides with the edge of the orthographic projection of the first retaining wall portion on the substrate extending along the second direction.

10. The display panel according to claim 1, characterized in that, The pixel definition layer also includes two edge blocking portions, which are respectively disposed on the side of the first blocking portion on both sides of the second direction away from the substrate.

11. The display panel according to claim 10, characterized in that, The distances between the edge retaining wall portion and the substrate on the side away from the substrate, the distances between the second retaining wall portion and the substrate on the side away from the substrate, and the distances between the third retaining wall portion and the substrate on the side away from the substrate are all equal.

12. The display panel according to claim 1, characterized in that, The distance between the first barrier portion and the substrate on the side facing away from the substrate is 0.3µm-0.7µm, and the distance between the second barrier portion and the third barrier portion and the substrate on the side facing away from the substrate is 0.9µm-1.3µm.

13. The display panel according to claim 1, characterized in that, The material of the first barrier portion includes a hydrophilic material, while the materials of the second barrier portion and the third barrier portion both include a hydrophobic material.

14. A method for manufacturing a display panel, characterized in that, A plurality of first barrier portions are formed on the substrate, the first barrier portions extending along a first direction, and the plurality of first barrier portions being arranged along a second direction; A plurality of second and third baffle portions are formed on the substrate, wherein the second baffle portions extend along the second direction and the plurality of second baffle portions are arranged along the first direction; The plurality of first and second barrier portions intersect to define a plurality of openings. The orthographic projection of the third barrier portion on the substrate is located within the orthographic projection range of the first barrier portion on the substrate. The third barrier portion is located between two adjacent second barrier portions. The distance between the side of the second barrier portion away from the substrate and the substrate, and the distance between the side of the third barrier portion away from the substrate and the substrate, are both greater than the distance between the side of the first barrier portion away from the substrate and the substrate. The dimension of the third baffle portion in the first direction is smaller than the dimension of the opening in the first direction. A first channel is provided between the third baffle portion and at least one of the two adjacent second baffle portions. The first channel is used to allow the luminescent layer solution located in the openings on both sides of the third baffle portion to communicate through the first channel.

15. The method according to claim 14, wherein, It also includes, The solution for inkjet printing the light-emitting layer along the second direction is interconnected between the solutions of the light-emitting layer between two adjacent first barrier portions. The solution of the light-emitting layer is dried to form the light-emitting layer.

16. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 13.

Images