Display panel and its manufacturing method

Abstract

This invention discloses a display panel and a method for manufacturing the display panel. The method includes the following steps: S10: providing a first ink and a second ink, wherein the first ink includes a first solvent, the second ink includes the first solvent, and the viscosity of the first ink is less than the viscosity of the second ink; S20: providing a substrate, printing a first ink layer on the substrate using the first ink and forming a second ink layer using the second ink, wherein the second ink layer is formed around the first ink layer; S30: curing the first ink layer and the second ink layer to form an organic functional layer, wherein the uniformity of the film thickness of the formed organic functional layer is effectively improved by setting the viscosity of the second ink used to form the second ink layer to be greater than the viscosity of the first ink used to form the first ink layer.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel and a method for manufacturing the display panel. Background Technology

[0002] Organic Light Emitting Diode (OLED) is a current-driven organic light-emitting device. It mainly emits light through the injection and recombination of charge carriers in organic light-emitting materials under the influence of an electric field. Because OLEDs only require a low voltage to drive and are relatively simple to manufacture, they have significant advantages in the display field. Compared to liquid crystal displays, OLEDs are lighter, thinner, have a wider field of view, and are simpler to manufacture, which has led to increasingly widespread research on them.

[0003] Traditional OLED devices are manufactured using vapor deposition methods. However, due to the high cost of vapor deposition processes and materials, they have gradually been replaced by inkjet printing. Inkjet printing involves spraying ink onto a display substrate, followed by curing the film by evaporating the solvent. During the curing process, the solution is less likely to evaporate closer to the center of the display substrate and more likely to evaporate closer to the edge of the display area. The different solvent evaporation rates in the central and edge areas of the display area result in different film uniformity at different locations within the display area. Therefore, OLED devices currently manufactured using inkjet printing methods suffer from the technical problem of poor film uniformity between the central and edge display areas. Summary of the Invention

[0004] This invention provides a display panel and a method for preparing the display panel, which enables the formed organic functional layer to have better film thickness uniformity.

[0005] To address the above problems, in a first aspect, the present invention provides a method for manufacturing a display panel, the method comprising the following steps:

[0006] S10: Provide a first ink and a second ink, wherein the first ink includes a first solvent, the second ink includes the first solvent, and the viscosity of the first ink is less than the viscosity of the second ink;

[0007] S20: A substrate is provided, a first ink layer is formed by printing the first ink on the substrate, and a second ink layer is formed by using the second ink, wherein the second ink layer is formed around the first ink layer;

[0008] S30: The first ink layer and the second ink layer are cured to form an organic functional layer.

[0009] In a method for preparing a display panel provided in an embodiment of the present invention, the display panel includes a display area. In step S20, a first ink layer and a second ink layer are formed in the display area. In step S30, the first ink layer is cured to form a first organic functional sublayer, and the second ink layer is cured to form a second organic functional sublayer.

[0010] In a method for manufacturing a display panel provided in an embodiment of the present invention, the display panel includes a display area and a border area disposed around the display area. In step S20, a first ink layer is formed in the display area, and a second ink layer includes a first ink sublayer formed in the display area and surrounding the first ink layer, and a second ink sublayer formed in the border area and surrounding the first ink sublayer. In step S30, the first ink layer is cured to form a first organic functional sublayer, the first ink sublayer is cured to form a second organic functional sublayer, and the second ink sublayer is cured to form a buffer sublayer.

[0011] In a method for preparing a display panel provided in an embodiment of the present invention, in step S10, a third ink is also provided, the third ink includes the first solvent and the viscosity of the third ink is greater than that of the second ink; in step S20, the third ink is used to print a third ink layer on the substrate, the third ink layer is formed in the display area and surrounds the second ink layer; in step S30, the third ink layer is cured to form a third organic functional sublayer.

[0012] In a method for preparing a display panel provided in an embodiment of the present invention, the organic functional layer is a hole injection layer or a hole transport layer.

[0013] In a method for preparing a display panel provided in an embodiment of the present invention, the organic functional layer is an organic light-emitting layer.

[0014] In a method for preparing a display panel provided in an embodiment of the present invention, in step S10, the first ink includes a low-viscosity first color ink, a low-viscosity second color ink, and a low-viscosity third color ink, and the second ink includes a high-viscosity first color ink, a high-viscosity second color ink, and a high-viscosity third color ink.

[0015] In S20, forming the first ink layer includes printing a first ink first color sub-layer using the low-viscosity first color ink, printing a first ink second color sub-layer using the low-viscosity second color ink, and printing a first ink third color sub-layer using the low-viscosity third color ink; forming the second ink layer includes printing a second ink first color sub-layer using the high-viscosity first color ink, printing a second ink second color sub-layer using the high-viscosity second color ink, and printing a second ink third color sub-layer using the high-viscosity third color ink.

[0016] In a method for preparing a display panel provided in an embodiment of the present invention, the first ink includes the first solvent and the first solute, the second ink includes the first solvent and the second solute, and the relative molecular mass of the first solute is smaller than the relative molecular mass of the second solute.

[0017] In a method for preparing a display panel provided in an embodiment of the present invention, the first ink includes the first solvent, the first solute and the first viscosity modifier, the second ink includes the first solvent, the first solute and the first viscosity modifier, and the content of the first viscosity modifier in the first printing ink is greater than the content of the first viscosity modifier in the second printing ink.

[0018] Secondly, the present invention provides a display panel prepared by the above-described display panel preparation method.

[0019] Beneficial effects: This invention provides a display panel and a method for preparing the display panel. In the preparation method, by setting the viscosity of the second ink used to form the second ink layer to be greater than the viscosity of the first ink used to form the first ink layer, the resistance encountered by the first solvent molecules in the second ink layer during movement is greater than the resistance encountered by the first solvent molecules in the first ink layer during movement. This reduces the evaporation rate of the solvent molecules in the second ink layer, which originally had a faster evaporation rate, to approximately or equal to the evaporation rate of the first solvent molecules in the first ink layer. Consequently, the film thicknesses of the first ink layer and the second ink layer obtained by curing are as close as possible, thus effectively improving the uniformity of the film thickness of the formed organic functional layer. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a textual flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present invention;

[0022] Figures 2a-2c This is a schematic diagram of the structural process of a method for manufacturing a display panel according to an embodiment of the present invention;

[0023] Figures 3a-3c This is a schematic diagram of the structural process of another method for manufacturing a display panel according to an embodiment of the present invention;

[0024] Figures 4a-4c This is a schematic diagram of the structural process of another method for manufacturing a display panel according to an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional structural diagram of a display panel provided in an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0029] This invention provides a method for manufacturing a display panel; please refer to [link / reference]. Figure 1 The preparation method specifically includes the following steps:

[0030] S10: Provide a first ink and a second ink, wherein the first ink includes a first solvent, the second ink includes the first solvent, and the viscosity of the first ink is less than the viscosity of the second ink;

[0031] S20: A substrate is provided, a first ink layer is formed by printing the first ink on the substrate, and a second ink layer is formed by using the second ink, wherein the second ink layer is formed around the first ink layer;

[0032] S30: The first ink layer and the second ink layer are cured to form an organic functional layer.

[0033] The following combination Figures 2a-2c To elaborate:

[0034] Please see Figure 2a A substrate 100 is provided, and an ink layer is formed on the substrate 100 by inkjet printing. Specifically, the first ink layer 210a is formed in the middle region of the substrate 100 using the first ink, and a second ink layer 220a is formed in the edge region of the substrate 100 using the second ink. The second ink layer 220a is formed around the first ink layer 210a.

[0035] Please see Figure 2b ,for Figure 2aA cross-sectional view of the BB' position shows that, typically, before forming an ink layer by inkjet printing, a pixel definition layer 300 is formed on the substrate 100. The pixel definition layer 300 has a mesh structure and includes multiple grooves for forming pixel structures. During the printing process, the first ink is used to perform inkjet printing in each of the grooves corresponding to the middle region to form the first ink layer 210a. The first ink layer 210a includes a first ink portion formed in each of the grooves. The second ink is used to perform inkjet printing in each of the grooves corresponding to the edge region to form the second ink layer 220a. The second ink layer 220a includes a second ink portion formed in each of the grooves.

[0036] Please see Figure 2c The first ink layer 210a and the second ink layer 220a are subjected to a curing process, that is, the first solvent present in the first ink layer 210a and the second ink layer 220a is removed by evaporation, so that the first ink layer 210a and the second ink layer 220a are cured to form an organic functional layer 200.

[0037] In the method for preparing a display panel provided in this embodiment of the invention, the organic functional layer is formed by printing the first ink and the second ink with different viscosities. Specifically, the first ink with relatively low viscosity is used to print the first ink layer in the middle region of the substrate, and the second ink with relatively high viscosity is used to print the second ink layer in the edge region of the substrate. During the curing process of the first ink layer and the second ink layer, since both the first ink and the second ink contain the first solvent, that is, the solvent in the first ink and the second ink is the same, theoretically the solvent evaporation rate in the first ink layer and the second ink layer should be the same.

[0038] However, since the second ink layer surrounds the outside of the first ink layer, and there are no other ink layers outside the second ink layer, the density of the first solvent molecules above the first ink layer is greater than that above the second ink layer during the curing process. The more gas molecules there are above the ink layer, the more it restricts the evaporation of solvent molecules in the ink layer, thus making the evaporation rate of the first solvent in the first ink layer less than that of the solvent in the second ink layer.

[0039] Therefore, in order to balance the difference in evaporation rates between the second ink layer and the first ink layer, the viscosity of the second ink used to form the second ink layer is set to be greater than the viscosity of the first ink used to form the first ink layer. Since the viscosity of the second ink is greater than that of the first ink, the resistance encountered by the first solvent molecules in the second ink layer during movement is greater than that encountered by the first solvent molecules in the first ink layer. This reduces the evaporation rate of the solvent molecules in the second ink layer, which originally had a faster evaporation rate, to be close to or equal to the evaporation rate of the first solvent molecules in the first ink layer. When the evaporation rates of the first solvent molecules in the second ink layer and the first ink layer are as close as possible, the amount of solute evaporated along with the first solvent during the curing process of the second ink layer and the first ink layer is also as close as possible. Consequently, the film thicknesses of the cured films obtained from the first ink layer and the second ink layer are as close as possible, thus effectively improving the uniformity of the film thickness of the formed organic functional layer.

[0040] It should be noted that the viscosity difference between the first ink and the second ink is not specifically limited in this embodiment of the invention, and the specific viscosity difference is set according to the actual process requirements.

[0041] In some embodiments, please refer to Figure 2a The display panel includes a display area AA and a border area NA disposed around the display area AA. In S20, the first ink layer 210a and the second ink layer 220a are formed within the display area. In S30, please refer to... Figure 2c The first ink layer 210a is cured to form a first organic functional sublayer 210, and the second ink layer 220a is cured to form a second organic functional sublayer 220.

[0042] By specifically setting the viscosity of the printing ink, the thickness of the edge of the final film layer can also be within the specified range. That is, the final film layer can be used as the actual display film layer located in the display area AA. Then, the organic functional layer 200 only needs to be composed of the first organic functional sub-layer 210 and the second organic functional sub-layer 220 disposed in the display area AA. On the one hand, the cost of ink material can be saved. On the other hand, since it is not necessary to print a film layer of a certain width in the border area NA to ensure the uniformity of the film layer thickness in the display area, the width of the border area NA of the display panel can be narrowed to a certain extent, which is conducive to realizing narrow border display.

[0043] In this embodiment, the width of the second ink layer formed by printing with the second ink is not limited, but is set according to the actual process requirements. For example, when the display area AA of the display panel has 2166*3846 pixels, the six pixels on the outer ring of the display area AA are formed by printing with the second ink, and the other pixels inside are formed by printing with the first ink.

[0044] In some embodiments, please refer to Figure 3a The display panel includes a display area AA and a border area NA disposed around the display area. In S20, the first ink layer 210a is formed in the display area, and the second ink layer 220a includes a first ink sublayer 221a formed in the display area AA and surrounding the first ink layer 210a, and a second ink sublayer 222a formed in the border area NA and surrounding the first ink sublayer 221a.

[0045] Please see Figure 3b ,for Figure 3a A cross-sectional view of the CC' position shows that, typically, before forming an ink layer by inkjet printing, a pixel definition layer 300 is formed on the substrate 100. The pixel definition layer 300 has a grid-like structure, including multiple grooves located in the display area AA for forming pixel structures and an annular groove located in the border area NA surrounding the display area AA. In the specific printing process, the first ink is used to perform inkjet printing in each of the grooves in the middle area of ​​the corresponding display area AA to form the first ink layer 210a, and the second ink is used to perform inkjet printing in each of the grooves in the edge area of ​​the corresponding display area AA to form the first ink sub-layer 221a, and the second ink sub-layer 222a is formed in the annular groove in the border area NA.

[0046] Please see Figure 3c In S30, the first ink layer 210a is cured to form a first organic functional sublayer 210, the first ink sublayer 221a is cured to form a second organic functional sublayer 220, and the second ink sublayer 222a is cured to form a buffer sublayer 230.

[0047] This embodiment is largely the same as the display panel preparation method provided in the previous embodiment. The difference is that the second ink is also used to form the second ink sublayer 222a in the border area NA. This can further increase the density of the first solvent molecules above the first ink sublayer 221a, so that the density of the first solvent molecules above the first ink sublayer 221a is closer to the density of the first solvent molecules above the first ink layer 210a. That is, it further makes the evaporation rate of the first solvent in the first ink sublayer 221a closer to the evaporation rate of the first solvent in the first ink layer 210a. As a result, the film thickness of the film obtained by curing the first ink layer 210a and the first ink sublayer 221a is as close as possible, so that the uniformity of the film thickness of the formed organic functional layer is effectively improved.

[0048] It should be noted that the width of the buffer sublayer 230 formed by the curing of the second ink sublayer 222a is narrower than the width of the film layer formed in the border area in conventional inkjet printing, and will not cause the problem of increasing the width of the border area of ​​the display panel.

[0049] In some embodiments, please refer to Figure 4a In S10, a third ink is also provided, the third ink comprising the first solvent and the viscosity of the third ink being greater than the viscosity of the second ink, that is, the viscosity of the first ink being less than the viscosity of the second ink and the viscosity of the second ink being less than the viscosity of the third ink; in S20, a third ink layer 230a is also formed by printing the third ink on the substrate 100, the third ink layer 230a being formed on the display area AA and surrounding the second ink layer 220a;

[0050] Please see Figure 4b ,for Figure 4a A cross-sectional view of the DD' position shows that, typically, before forming an ink layer by inkjet printing, a pixel definition layer 300 is formed on the substrate 100. The pixel definition layer 300 has a grid-like structure, including multiple grooves located in the display area AA for forming pixel structures. In the specific printing process, the first ink is used to inkjet print the first ink layer 210a in each of the grooves in the middle area of ​​the corresponding display area AA, and the third ink is used to inkjet print the third ink layer 230a in each of the grooves in the edge area of ​​the corresponding display area AA, and the second ink is used to inkjet print the second ink layer 220a in each of the grooves between the first ink layer 210a and the third ink layer 230a.

[0051] Please see Figure 4cIn S30, the third ink layer 230a is cured to form a third organic functional sublayer 240;

[0052] This embodiment is largely the same as the display panel preparation method provided in the previous embodiment. The difference is that the third ink is also used to form the third ink layer 230a around the outside of the second ink layer 220a. That is, the organic functional layer is formed by printing in sections using three inks with different viscosities. Compared with the previous embodiment, which uses two inks with different viscosities to print in sections to form the organic functional layer, this is beneficial to make the solvent evaporation rate of different areas of the printed ink layer more similar, thereby further improving the uniformity of the film thickness of the cured organic functional layer.

[0053] It is understandable that the more types of inks with different viscosities used, the more finely the ink layer printing area is divided, and the better the uniformity of the film thickness of the organic functional layer formed after curing. However, using too many types of inks with different viscosities will lead to a complex printing process and excessively high printing costs. Therefore, in practical applications, the specific preparation method should be set by taking into account both cost control and process specifications.

[0054] In some embodiments, the organic functional layer prepared in the foregoing embodiments may be an organic film layer required in the display panel, such as a hole transport layer, a hole injection layer, or an organic light-emitting layer.

[0055] When the organic functional layer is the organic light-emitting layer, the organic light-emitting layer includes a first color organic light-emitting sublayer, a second color organic light-emitting sublayer, and a third color organic light-emitting sublayer;

[0056] In step S10, the first ink includes a low-viscosity first color ink, a low-viscosity second color ink, and a low-viscosity third color ink, and the second ink includes a high-viscosity first color ink, a high-viscosity second color ink, and a high-viscosity third color ink, wherein the viscosity of the low-viscosity first color ink is less than that of the high-viscosity first color ink, the viscosity of the low-viscosity second color ink is less than that of the high-viscosity second color ink, and the viscosity of the low-viscosity third color ink is less than that of the high-viscosity third color ink;

[0057] In S20, forming the first ink layer includes printing a first ink first color sub-layer using the low-viscosity first color ink, printing a first ink second color sub-layer using the low-viscosity second color ink, and printing a first ink third color sub-layer using the low-viscosity third color ink; forming the second ink layer includes printing a second ink first color sub-layer using the high-viscosity first color ink, printing a second ink second color sub-layer using the high-viscosity second color ink, and printing a second ink third color sub-layer using the high-viscosity third color ink.

[0058] In S30, the first ink first color sublayer and the second ink first color sublayer are cured to form the first color organic light-emitting sublayer, the first ink second color sublayer and the second ink second color sublayer are cured to form the second color organic light-emitting sublayer, and the first ink third color sublayer and the second ink third color sublayer are cured to form the third color organic light-emitting sublayer.

[0059] In some embodiments, the ink used for printing typically includes a solvent, a solute, and trace amounts of printing aids, wherein the solute is the effective material for forming the organic functional layer. The viscosity of the ink used in this embodiment can be determined as follows:

[0060] Firstly, the first ink includes a first solvent and a first solute, and the second ink includes a first solvent and a second solute. The relative molecular mass of the first solute is smaller than that of the second solute. That is, the viscosity difference is achieved by adjusting the molecular chain length and relative molecular mass of the solute. Specifically, the longer the molecular chain and the larger the relative molecular mass of the solute, the greater the viscosity of the ink. Therefore, by setting the relative molecular mass of the first solute to be smaller than that of the second solute, the viscosity of the second ink can be made greater than that of the first ink.

[0061] Secondly, in some embodiments, the first ink includes the first solvent, the first solute, and the first viscosity modifier, and the second ink includes the first solvent, the first solute, and the first viscosity modifier. The content of the first viscosity modifier in the first printing ink is greater than the content of the first viscosity modifier in the second printing ink. That is, all components in the first ink and the second ink are the same, and the viscosity difference is achieved by adjusting the amount of viscosity modifier added. Of course, the first ink and the second ink may each include two different types of viscosity modifiers to achieve the desired viscosity difference.

[0062] The method for adjusting the viscosity of the ink in this embodiment of the invention is not limited to the above, but is adjusted under the following premise: First, the mass percentage of solute in the first ink and the second ink should be equal; second, the types of solvent in the first ink and the second ink should be the same.

[0063] It should be noted that when the third ink or other inks are also included, the method for adjusting the viscosity is the same as described above, and will not be repeated in the embodiments of the present invention.

[0064] Another embodiment of the present invention also provides a display panel, which is prepared by the method for preparing the display panel provided in the foregoing embodiments. For details, please refer to [link to relevant documentation]. Figure 5 The display panel typically includes: a substrate 100, a first electrode layer L1 disposed on the substrate 100, a pixel definition layer 300 disposed on the substrate 100 and the first electrode layer L1, a light-emitting functional layer L2 disposed on the first electrode layer L1, and a second electrode layer L3 disposed on the light-emitting functional layer L2.

[0065] The substrate 100 is typically an array substrate, including a thin-film transistor layer for driving the display. The light-emitting functional layer L2 typically includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer stacked together. At least one of the hole injection layer, hole transport layer, and organic light-emitting layer is formed by the method for preparing the organic functional layer provided in the foregoing embodiments.

[0066] Another embodiment of the present invention provides a display device, which includes the display panel provided in the above embodiments. The display device includes, but is not limited to, mobile phones, smartwatches, tablet computers, laptops, televisions, etc.

[0067] The above provides a detailed description of a display panel and a method for preparing the display panel according to embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for manufacturing a display panel, characterized in that, The display panel includes a display area and a border area disposed around the periphery of the display area. The border area has an annular groove surrounding the display area. The method for manufacturing the display panel includes: S10: Provide a first ink and a second ink, wherein the first ink includes a first solvent, the second ink includes the first solvent, and the viscosity of the first ink is less than the viscosity of the second ink; S20: A substrate is provided, on which a first ink layer is formed by printing the first ink and a second ink layer is formed by using the second ink. The second ink layer is formed around the first ink layer. The first ink layer is formed in the display area. The second ink layer includes a first ink sub-layer formed in the display area and surrounding the first ink layer, and a second ink sub-layer formed in the border area and surrounding the first ink sub-layer. The second ink sub-layer is disposed in the annular groove. S30: The first ink layer and the second ink layer are cured to form an organic functional layer. The first ink layer is cured to form a first organic functional sublayer. The first ink sublayer is cured to form a second organic functional sublayer. The second ink sublayer is cured to form a buffer sublayer. The width of the second ink sublayer is smaller than the thickness of the second organic functional sublayer. The first ink comprises the first solvent and the first solute, and the second ink comprises the first solvent and the second solute. The relative molecular mass of the first solute is less than the relative molecular mass of the second solute, and the molecular chain length of the first solute is less than the molecular chain length of the second solute.

2. The method for manufacturing a display panel according to claim 1, characterized in that, The display panel includes a display area. In S20, the first ink layer and the second ink layer are formed in the display area. In S30, the first ink layer is cured to form a first organic functional sublayer, and the second ink layer is cured to form a second organic functional sublayer.

3. The method for manufacturing a display panel according to claim 2, characterized in that, In S10, a third ink is also provided, the third ink comprising the first solvent and having a viscosity greater than that of the second ink. In S20, the third ink is printed on the substrate to form a third ink layer, the third ink layer being formed in the display area and surrounding the second ink layer. In S30, the third ink layer is cured to form a third organic functional sublayer.

4. The method for manufacturing a display panel according to claim 1, characterized in that, The organic functional layer is a hole injection layer or a hole transport layer.

5. The method for manufacturing a display panel according to claim 1, characterized in that, The organic functional layer is an organic light-emitting layer.

6. The method for manufacturing a display panel according to claim 5, characterized in that, In S10, the first ink includes a low-viscosity first color ink, a low-viscosity second color ink, and a low-viscosity third color ink, and the second ink includes a high-viscosity first color ink, a high-viscosity second color ink, and a high-viscosity third color ink. In S20, forming the first ink layer includes printing a first ink first color sub-layer using the low-viscosity first color ink, printing a first ink second color sub-layer using the low-viscosity second color ink, and printing a first ink third color sub-layer using the low-viscosity third color ink; forming the second ink layer includes printing a second ink first color sub-layer using the high-viscosity first color ink, printing a second ink second color sub-layer using the high-viscosity second color ink, and printing a second ink third color sub-layer using the high-viscosity third color ink.

7. A display panel, characterized in that, It is prepared by the method of preparing the display panel according to any one of claims 1-6.

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