Display panel and display device

Abstract

The embodiment of the utility model provides a display panel and a display device. According to the display panel, the step is arranged on the side wall of the second opening, and any point on the interface of the hole transport layer and the hole injection layer and any point on the interface of the hole transport layer and the light emitting layer are arranged at intervals, so that the hole transport layer can cross an inflection point of a hydrophobic group when being formed by arranging the step; a gap exists between the interface of the hole transport layer and the hole injection layer and the interface of the hole transport layer and the light-emitting layer, direct contact between the upper surface of the hole injection layer and the upper surface of the hole transport layer is avoided, contact between the hole injection layer and an electronic layer is avoided, and a leakage path is blocked; the ink does not cross the steps of the pixel definition layer to cause crosstalk between the adjacent sub-pixels, so that the yield of the display panel is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially is related to a display panel and display device. BACKGROUND

[0002] Organic light emitting diode (Organic Light-Emitting Diode, OLED) display device has light, wide viewing angle, fast response, low temperature resistance, high luminous efficiency, and can be widely used in various fields. In order to improve material utilization, reduce cost, the existing OLED display device will adopt ink jet printing (Ink Jet Printing, IJP) process to form some film layers in OLED device, and in order to prevent the formation of crosstalk between adjacent sub-pixels, the pixel definition layer has certain hydrophobicity. But in the actual preparation process, it is found that the pin rakes point of the hole injection layer, the hole transport and the light emitting layer in the OLED display device are consistent with the hydrophobic group inflection point of the pixel definition layer, that is, the pin rakes point of the hole injection layer, the hole transport and the light emitting layer is consistent, the upper layer of the electron layer will be directly overlapped with the hole injection layer, and the leakage path is formed, which leads to the display failure of OLED display device.

[0003] Therefore, the existing OLED display device has the problem that the hole injection layer will be directly overlapped with the electron layer to form a leakage path, resulting in display failure. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a kind of display panel and display device, to solve the problem that the existing OLED display device exists hole injection layer will be directly overlapped with the electron layer to form a leakage path, resulting in display failure.

[0005] In order to achieve the above purpose, according to the first aspect of the utility model, a display panel is provided, comprising:

[0006] a substrate;

[0007] a pixel electrode layer disposed on one side of the substrate;

[0008] a pixel definition layer disposed on the side of the pixel electrode layer away from the substrate, the pixel definition layer includes a first sub-layer and a second sub-layer, the first sub-layer includes a first opening, the second sub-layer is disposed on the side of the first sub-layer away from the pixel electrode layer and extends into the first opening, and the second sub-layer includes a second opening;

[0009] A light-emitting material layer is at least partially disposed in the second opening, the light-emitting material layer comprising a hole injection layer, a hole transport layer disposed on a side of the hole injection layer away from the pixel electrode layer, and a light-emitting layer disposed on a side of the hole transport layer away from the hole injection layer.

[0010] The side wall of the second opening is provided with a step, and any point on the interface between the hole transport layer and the hole injection layer is spaced apart from any point on the interface between the hole transport layer and the light-emitting layer.

[0011] Optionally, any point on the interface between the light-emitting layer and the hole transport layer is spaced apart from any point on the surface of the side of the light-emitting layer away from the hole transport layer.

[0012] Optionally, along the side away from the pixel electrode layer, the step comprises a first side surface, a first top surface, a second side surface and a second top surface arranged in sequence, the first top surface connects the first side surface and the second side surface, the second side surface connects the first top surface and the second top surface, and the interface between the hole transport layer and the hole injection layer is in contact with the first side surface.

[0013] Optionally, the interface between the hole transport layer and the light-emitting layer is in contact with the first side surface, or the interface between the hole transport layer and the light-emitting layer is in contact with the second side surface.

[0014] Optionally, the surface of the side of the light-emitting layer away from the hole transport layer is in contact with the first side surface, or the surface of the side of the light-emitting layer away from the hole transport layer is in contact with the second side surface.

[0015] Optionally, the light-emitting layer is in direct contact with the first side surface, the first top surface and the second side surface.

[0016] Optionally, the width of the first top surface is greater than or equal to the distance between the first side surface and the side wall of the first sub-layer.

[0017] Optionally, the hydrophobicity of the side of the second sub-layer away from the pixel electrode layer is greater than the hydrophobicity of the side of the second sub-layer close to the pixel electrode layer.

[0018] Optionally, the hydrophobicity of the second sub-layer is greater than the hydrophobicity of the first sub-layer.

[0019] According to a second aspect of the present application, a display device is provided, which comprises the display panel according to any one of the above embodiments.

[0020] The utility model discloses an embodiment provides a display panel and display device, the display panel is through making the side wall of second opening is equipped with the step, the interface of any point on the interface of hole transport layer and hole injection layer, with the interface of any point on hole transport layer and light emitting layer interval arrangement, then can pass through setting the step, makes hole transport layer when forming can cross the inflection point of hydrophobic group, makes the interface of hole transport layer and hole injection layer and the interface of hole transport layer and light emitting layer exist interval, avoids the upper surface of hole injection layer and hole transport layer upper surface direct contact, thereby avoided the contact between hole injection layer and electron layer, blocked the electric leakage path, and because the existence of the step, the ink will not cross the step of pixel definition layer and lead to the crosstalk between adjacent subpixels, improved the yield of display panel.

[0021] Other features and advantages of the utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the utility model embodiment, the following will briefly introduce the drawing needed to be used in the embodiment description. Obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0023] In order to more completely understand the utility model and its beneficial effects, the following will be described in conjunction with the drawings, and same reference numerals in the following description indicate same parts.

[0024] Figure 1 The utility model embodiment provides a kind of schematic diagram of comparative display device.

[0025] Figure 2 The utility model embodiment provides a kind of schematic diagram of comparative display device in each step corresponding in the preparation process of comparative display device.

[0026] Figure 3 The first kind of schematic diagram of display panel provided by the utility model embodiment.

[0027] Figure 4 The second kind of schematic diagram of display panel provided by the utility model embodiment.

[0028] Figure 5 The utility model embodiment provides the schematic diagram of display panel of each step corresponding in the preparation method of display panel. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] In order to illustrate the principle of the technical problem of the embodiment of the utility model, some comparative display devices are provided. It is understood that the comparative display devices cannot be used as the prior art of the embodiment of the utility model. Figure 1 As shown, Figure 1 (a) is a schematic diagram of a comparative display device. Figure 1 (b) in Figure 1 The enlarged view of region A of the comparative display device in (a) is shown. Figure 1 As shown in (a) in the figure, a comparative display device includes an anode 11, a pixel definition film 12, a hole injection film 131, a hole transport film 132, a light-emitting film 133 and an electron transport film 134. In order to prevent crosstalk between adjacent sub-pixels, the pixel definition film 12 is made hydrophobic. Specifically, fluorine-containing hydrophobic particles 121 are provided in the pixel definition film 12 (it can be understood that the fluorine-containing hydrophobic particles 121 are microscopic particles and cannot be seen macroscopically. In order to illustrate the design of the comparative display device, the fluorine-containing hydrophobic particles are schematically shown here). Since the concentration of the fluorine-containing hydrophobic particles gradually changes from bottom to top, the upper side of the pixel definition film 12 is more hydrophobic. At the same time, in order to improve material utilization and reduce costs, the existing comparative display device adopts inkjet printing (IJP) process to form the hole injection film 131, the hole transport film 132 and the light-emitting film 133. Due to the presence of fluorine-containing hydrophobic particles, when forming the hole injection film 131, the hole transport film 132 and the light-emitting film 133, the ink forming the hole injection film 131, the hole transport film 132 and the light-emitting film 133 cannot break through the inflection point of the fluorine-containing hydrophobic particles at the side wall of the pixel definition film 12. Figure 1 (a) and Figure 1 As shown in (b), the rake points where the hole injection film 131, the hole transport film 132 and the light-emitting film 133 contact the pixel definition film 12 are all consistent with the inflection points of the fluorine-containing hydrophobic particles 121. Then, at the side wall of the pixel definition film 12, the hole injection film 131 and the electron transport film 134 will be in direct contact, forming a leakage path, resulting in poor display of the OLED display device.

[0031] In order to solve the above problems, some comparative display devices increase the volume of ink during the preparation process, such as Figure 2As shown, anode 11, pixel definition film 12 and hole injection film 131 will be formed in sequence, at this time the structure of the contrast display device is as shown in Figure 2 As shown in (a) of FIG. 1, then the volume of the ink forming the hole transport film 132 will be increased, as shown in (b) of FIG. 1, because the volume of the ink crosses the inflection point of the side wall and the upper surface of the pixel definition film 12, the ink is easy to slide on the upper surface of the pixel definition film 12, resulting in crosstalk between adjacent sub-pixels, which will bring new problems. Therefore, the existing OLED display device has the problem that the hole injection layer will be directly overlapped with the electron layer to form a leakage path, resulting in display failure. Figure 2

[0032] The display panel and display device provided by the embodiments of the present application aim to solve the above technical problems.

[0033] Figure 3 The first schematic diagram of the display panel provided by the embodiments of the present application. Figure 4 The second schematic diagram of the display panel provided by the embodiments of the present application. Figure 5 The structure schematic diagram of the display panel corresponding to each step of the preparation method of the display panel provided by the embodiments of the present application.

[0034] As shown in FIG. 1, the embodiments of the present application provide a display panel, which comprises a substrate 21, a pixel electrode layer 22, a pixel definition layer 23 and a light emitting material layer 24, the pixel electrode layer 22 is arranged on one side of the substrate 21, the pixel definition layer 23 is arranged on the side of the pixel electrode layer 22 away from the substrate 21, the pixel definition layer 23 comprises a first sub-layer 231 and a second sub-layer 232, the first sub-layer 231 comprises a first opening 231a, the second sub-layer 232 is arranged on the side of the first sub-layer 231 away from the pixel electrode layer 22 and extends into the first opening 231a, and the second sub-layer 232 comprises a second opening 232a; at least part of the light emitting material layer 24 is arranged in the second opening 232a, the light emitting material layer 24 comprises a hole injection layer 241, a hole transport layer 242 and a light emitting layer 243, the hole transport layer 242 is arranged on the side of the hole injection layer 241 away from the pixel electrode layer 22, and the light emitting layer 243 is arranged on the side of the hole transport layer 242 away from the hole injection layer 241. Figure 3 Figure 4 In the embodiments of the present application, a step 31 is arranged on the side wall of the second opening 232a, and any point on the interface 242a between the hole transport layer 242 and the hole injection layer 241 is arranged to be spaced apart from any point on the interface 242b between the hole transport layer 242 and the light emitting layer 243.

[0035] In the embodiments of the present application, a step 31 is arranged on the side wall of the second opening 232a, and any point on the interface 242a between the hole transport layer 242 and the hole injection layer 241 is arranged to be spaced apart from any point on the interface 242b between the hole transport layer 242 and the light emitting layer 243. ​​

[0036] The utility model discloses an embodiment provides a kind of display panel, the display panel is by making the side wall of second opening is equipped with step, the interface of any point on the interface of hole injection layer and hole transport layer, with the interface of any point on the interface of hole transport layer and light emitting layer is interval arrangement, then can be passed through setting step, make hole transport layer when forming can cross the inflection point of hydrophobic group, so that the interface of hole injection layer and hole transport layer and the interface of hole transport layer and light emitting layer exist spacing, avoid the upper surface of hole injection layer and hole transport layer upper surface direct contact, to avoid the contact between hole injection layer and electron layer, block the leakage path, and because of the existence of step, ink will not cross the step of pixel definition layer and cause crosstalk between adjacent sub-pixels, improve the yield of display panel.

[0037] Specifically, as shown in Figure 3 、 Figure 4 Indicated, second sublayer 232 has hydrophobicity, second sublayer 232 is equipped with hydrophobic particle 32, Figure 5 In second sublayer 232, hydrophobic particle 32 is schematically shown on the surface of second sublayer 232, it can be understood that hydrophobic particle is micro-particle existing in second sublayer 232, and it cannot be seen under macroscopically, and this is schematically shown for the purpose of explaining the design of display panel.

[0038] Specifically, hydrophobic particle can be fluorine-containing hydrophobic particle.

[0039] Specifically, it can be understood that, since hydrophobic particle itself moves when doping hydrophobic particle in second sublayer, therefore, actually, each region in second sublayer will have certain hydrophobicity, and hydrophobicity and hydrophilicity are relative, so that the region of second sublayer with less hydrophobic particle has poor hydrophobicity and certain hydrophilicity, the region of second sublayer with more hydrophobic particle has good hydrophobicity and poor hydrophilicity, and second sublayer prevents crosstalk between adjacent sub-pixels, so that the hydrophobicity of upper side of second sublayer is good, and the hydrophobicity of lower side is poor, and lower side has certain hydrophilicity to facilitate the formation of film layer, therefore, although there is no clear boundary between hydrophobicity and hydrophilicity in second sublayer, since the hydrophobicity of second sublayer can gradually change from the side close to pixel electrode layer to the side away from pixel electrode layer, therefore, at a certain place, the hydrophobicity of second sublayer is large, and ink cannot cross this place, so this place can be regarded as the inflection point of hydrophobicity of second sublayer, that is Figure 3 The inflection point of hydrophobic particle 32 shown in the figure or Figure 1The inflection point of the fluorine-containing hydrophobic particles limits the film layer formed by the ink to be below the inflection point of the hydrophobic particles of the second sub-layer, and the volume of the ink used to form the hole transport layer and the light-emitting layer is large enough to cross the inflection point of the fluorine-containing hydrophobic particles, so that the upper surface of the hole transport layer and the light-emitting layer is not limited to the inflection point of the hydrophobic particles, and the second sub-layer has a step, so that even if the volume of the ink used to form the hole transport layer and the light-emitting layer is large, the ink will be limited to the step and will not slide on the upper surface of the second sub-layer, thereby avoiding crosstalk between adjacent sub-pixels and improving the yield of the display panel.

[0040] Specifically, as shown in Figure 4 、 Figure 5 , it can be seen that in the area where the hole transport layer 242 contacts the second sub-layer 232, the lower surface of the hole transport layer 242 and the second sub-layer 232 are spaced apart from the upper surface of the hole transport layer 242 and the second sub-layer 232, thereby preventing the hole injection layer from directly contacting the electron transport layer.

[0041] Specifically, it can be understood that the second sub-layer will still have hydrophobicity, but due to the influence of gravity, the ink will forcibly cross the inflection point of the hydrophobic particles, so that the upper surface and the lower surface of the finally formed hole transport layer will not directly contact, thereby avoiding the problem of direct contact between the hole injection layer and the electron transport layer.

[0042] In some embodiments, as shown in Figure 4 、 Figure 5 , any point on the interface between the light-emitting layer 243 and the hole transport layer 242 is spaced apart from any point on the surface 243a of the side of the light-emitting layer 243 away from the hole transport layer 242. By spacing any point on the interface between the light-emitting layer and the hole transport layer from any point on the surface of the side of the light-emitting layer away from the hole transport layer, the upper surface of the light-emitting layer and the lower surface of the light-emitting layer are spaced apart, and the upper surface of the light-emitting layer and the lower surface of the light-emitting layer are not directly in contact, so that in the area where the second sub-layer contacts each light-emitting material layer, the upper surface and the lower surface of the hole transport layer are not directly in contact, and the upper surface and the lower surface of the light-emitting layer are not directly in contact, and there is no problem of the electron transport layer contacting the hole injection layer in the display panel, thereby preventing the display panel from leaking and improving the yield of the display panel.

[0043] Specifically, it can be understood that, since the upper surface of the hole transport layer has broken through the inflection point of the hydrophobic particles, the side walls of the ink for forming the light-emitting layer arranged on the upper surface of the hole transport layer are all hydrophobic, and the ink will not be limited at a certain place due to the difference between hydrophilic and hydrophobic, so that the upper surface and the lower surface of the light-emitting layer can be arranged at intervals, avoiding the problem of electric leakage caused by the direct contact between the hole transport layer and the electron transport layer. Even if the ink for forming the light-emitting layer printed on the upper surface of the hole transport layer is limited at a certain place, the volume of the ink for forming the light-emitting layer can be increased to prevent the ink from being limited at a certain place by the influence of gravity, and since the step exists, the ink will not flow between the adjacent two sub-pixels, preventing crosstalk of the display panel and improving the display effect.

[0044] In some embodiments, as shown in Figure 4 、 Figure 5 illustrated, along the side away from the pixel electrode layer 22, the step 31 includes a first side surface 311, a first top surface 312, a second side surface 313 and a second top surface 314 arranged in sequence, the first top surface 312 connects the first side surface 311 and the second side surface 313, the second side surface 313 connects the first top surface 312 and the second top surface 314, and the interface 242a between the hole transport layer 242 and the hole injection layer 241 is in contact with the first side surface 311.

[0045] Specifically, when the hole injection layer is arranged, the interface between the hole transport layer and the hole injection layer can be in contact with the first side surface, avoiding that the lower arrangement of the step causes the hole injection layer to be in contact with the side wall with larger hydrophobicity in the second sub-layer, affecting the film thickness of the hole injection layer and causing display defects.

[0046] Specifically, the interface between the hole transport layer and the hole injection layer can be the plane where the inflection point of the hydrophobic particles is located. By making the interface between the hole transport layer and the hole injection layer the plane where the inflection point of the hydrophobic particles is located, the hole injection layer can be in contact with the side wall with hydrophilic in the second sub-layer, the film thickness and uniformity of the hole injection layer can meet the requirements, preventing the hole injection layer from being affected by the hydrophobic particles to have smaller film thickness or poorer uniformity, and improving the yield of the display panel.

[0047] In some embodiments, as shown in Figure 4 、 Figure 5 illustrated, the interface 242b between the hole transport layer 242 and the light-emitting layer 243 is in contact with the first side surface 311, or the interface 242b between the hole transport layer 242 and the light-emitting layer 243 is in contact with the second side surface 313.

[0048] Specifically, when there is a distance between the upper surface of the hole transport layer and the lower surface of the hole transport layer, the interface between the hole transport layer and the light-emitting layer can be made to contact the first side surface, that is, the upper surface of the hole transport layer is located below the first top surface, thereby avoiding the excessive thickness of the hole transport layer leading to excessive thickness of the display panel.

[0049] Specifically, when there is a distance between the upper surface of the hole transport layer and the lower surface of the hole transport layer, the interface between the hole transport layer and the light-emitting layer can also be made to contact the second side surface, that is, the upper surface of the hole transport layer is located on the upper side of the first top surface and on the lower side of the second top surface, thereby further avoiding direct contact between the upper surface of the hole transport layer and the lower surface of the hole transport layer. In some display panels, the thickness of the hole transport layer needs to be larger, so at this time, the interface between the hole transport layer and the light-emitting layer can be made to contact the second side surface.

[0050] Specifically, the interface between the hole transport layer and the light-emitting layer may be in the same plane as the first top surface.

[0051] In some embodiments, as Figure 4 、 Figure 5 As shown, the surface 243 a of the light-emitting layer 243 away from the hole transport layer 242 contacts the first side 311 , or the surface of the light-emitting layer 243 away from the hole transport layer 242 contacts the second side 313 .

[0052] Specifically, when there is a distance between the upper surface of the light-emitting layer and the lower surface of the light-emitting layer, the surface of the light-emitting layer away from the hole transport layer can be made in contact with the first side surface, that is, the upper surface of the light-emitting layer is located below the first top surface, thereby avoiding the light-emitting layer being too thick and causing the display panel to be too thick.

[0053] Specifically, when there is a distance between the upper surface of the light-emitting layer and the lower surface of the light-emitting layer, the surface of the light-emitting layer away from the hole transport layer can also be made to contact the second side surface, that is, the upper surface of the light-emitting layer is located on the upper side of the first top surface and on the lower side of the second top surface, thereby further avoiding direct contact between the upper surface of the light-emitting layer and the lower surface of the light-emitting layer. In some display panels, the thickness of the light-emitting layer needs to be larger, and at this time, the interface between the light-emitting layers can be made to contact the second side surface.

[0054] Specifically, the surface of the light-emitting layer away from the hole transport layer may be in the same plane as the first top surface.

[0055] Specifically, the surface of the light-emitting layer away from the hole transport layer and the second top surface may be in the same plane.

[0056] In some embodiments, as Figure 4 、 Figure 5 As shown, the light-emitting layer 243 is in direct contact with the first side surface 311, the first top surface 312 and the second side surface 313. By making the light-emitting layer in direct contact with the first side surface, the first top surface and the second side surface, the distance between the surface of the side of the light-emitting layer away from the hole transport layer and the surface of the side of the light-emitting layer close to the hole transport layer can be made large, and the distance is in the lateral direction, thereby avoiding the hole injection layer from contacting the electron transport layer, and the design does not need to add other film layers, and does not need to increase the thickness of the display panel and the process steps.

[0057] In some embodiments, as shown in FIG. 3, the first top surface 312 has a width L1, and the second top surface 313 has a width L2. Figure 4 As shown, the width L1 of the first top surface 312 is greater than or equal to the distance L2 between the first side surface 311 and the sidewall of the first sub-layer 231. By making the width of the first top surface greater than or equal to the distance between the first side surface and the sidewall of the first sub-layer, the width of the first top surface can be made large, and more ink can be accommodated. When the volume of ink is increased, the ink can be further prevented from passing over the step to the second top surface and sliding on the second top surface, further preventing crosstalk between adjacent sub-pixels, and improving the yield of the display panel.

[0058] Specifically, the width of the first top surface can be one-half to one times the width of the second top surface.

[0059] In some embodiments, the hydrophobicity of the side of the second sub-layer 232 away from the pixel electrode layer 22 is greater than the hydrophobicity of the side of the second sub-layer 232 close to the pixel electrode layer 22. By making the hydrophobicity of the side of the second sub-layer away from the pixel electrode layer greater than the hydrophobicity of the side of the second sub-layer close to the pixel electrode layer, when inkjet printing is used to form each film layer, the ink is limited within the second opening formed by the second sub-layer, and crosstalk between adjacent sub-pixels caused by ink sliding between adjacent sub-pixels is avoided. The side of the second sub-layer close to the pixel definition layer has relatively low hydrophobicity, which can facilitate film formation of the ink.

[0060] Specifically, the second sub-layer can be formed by adding hydrophobic particles to a hydrophilic material, or the second sub-layer can be processed to have hydrophobicity, or the second sub-layer can be directly formed by using a hydrophobic material.

[0061] Specifically, taking the second sub-layer adding hydrophobic particles as an example, the second sub-layer as a whole has hydrophobicity, but the concentration of the hydrophobic particles in the second sub-layer is gradually changed, and the concentration of the hydrophobic particles at the first top surface and the second top surface is greater than the concentration of the hydrophobic particles under the first side surface. When film formation is performed, the ink can be better formed within the second opening, and the ink will not overflow the corresponding second opening, thereby preventing crosstalk between adjacent sub-pixels.

[0062] In some embodiments, the second sub-layer has a greater hydrophobicity than the first sub-layer. By making the second sub-layer have a greater hydrophobicity than the first sub-layer, the ink volume can be averaged when printing the ink corresponding to the sub-pixels of each light-emitting color, and crosstalk between the sub-pixels of different light-emitting colors can be avoided.

[0063] Specifically, the second sub-layer can include a plurality of portions arranged at intervals along a first direction, and the first sub-layer can include a plurality of portions arranged at intervals along a second direction, such that the sub-pixels of different light-emitting colors are connected together to form a linear pixel row, and the sub-pixels of different light-emitting colors are separated by the second sub-layer to avoid ink mixing when forming the sub-pixels of different light-emitting colors, thereby preventing crosstalk between the sub-pixels of different light-emitting colors and improving the yield of the display panel.

[0064] Specifically, the light-emitting material layer 24 further includes an electron transport layer 244, which is arranged on the side of the light-emitting layer 243 away from the hole transport layer 242.

[0065] Specifically, the light-emitting material layer can further include an electron injection layer, which can be arranged on the side of the electron transport layer away from the light-emitting layer.

[0066] Specifically, the display panel further includes a common electrode layer arranged on the side of the light-emitting material layer away from the pixel definition layer.

[0067] Meanwhile, an embodiment of the present application provides a preparation method of a display panel, the preparation method of the display panel comprising:

[0068] A substrate is provided, and a pixel electrode layer, a first sub-layer, a second sub-layer, and a hole injection layer are sequentially formed on the substrate; the structure of the display panel corresponding to this step is shown in (a) of FIG. 4. Figure 5

[0069] The ink 33 for forming the hole transport layer is printed on the hole injection layer in an inkjet printing manner, so that the ink 33 for forming the hole transport layer passes over the first top surface; the structure of the display panel corresponding to this step is shown in (b) of FIG. 4. Figure 5

[0070] The ink 33 for forming the hole transport layer is dried to obtain a hole injection layer; the structure of the display panel corresponding to this step is shown in (c) of FIG. 4. Figure 5

[0071] A light-emitting layer, an electron transport layer, an electron injection layer, and a common electrode layer are formed on the hole transport layer.

[0072] Meanwhile, an embodiment of the present application provides a display device, which comprises the display panel according to any one of the above embodiments. ​​​

[0073] In the description of the utility model, the term "first", "second" is only used for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0074] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0075] The embodiments, implementation manners and related technical features of the utility model can be combined, replaced with each other without conflict.

[0076] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, but any simple modification, equivalent change and modification made according to the technical essence of the utility model to the above embodiment still belongs to the scope of the technical scheme of the utility model.

Claims

1. A display panel, characterized in that: include: substrate; A pixel electrode layer is provided on one side of the substrate; a pixel definition layer, disposed on a side of the pixel electrode layer away from the substrate, the pixel definition layer comprising a first sublayer and a second sublayer, the first sublayer comprising a first opening, the second sublayer being disposed on a side of the first sublayer away from the pixel electrode layer and extending into the first opening, and the second sublayer comprising a second opening; a light-emitting material layer, at least partially disposed in the second opening, the light-emitting material layer comprising a hole injection layer, a hole transport layer, and a light-emitting layer, the hole transport layer being disposed on a side of the hole injection layer away from the pixel electrode layer, and the light-emitting layer being disposed on a side of the hole transport layer away from the hole injection layer; The sidewall of the second opening is provided with a step, and any point on the interface between the hole transport layer and the hole injection layer is spaced apart from any point on the interface between the hole transport layer and the light-emitting layer.

2. The display panel according to claim 1, wherein: Any point on the interface between the light-emitting layer and the hole transport layer is spaced apart from any point on the surface of the light-emitting layer on a side away from the hole transport layer.

3. The display panel according to claim 2, wherein: Along the side away from the pixel electrode layer, the step includes a first side surface, a first top surface, a second side surface and a second top surface arranged in sequence, the first top surface connects the first side surface and the second side surface, the second side surface connects the first top surface and the second top surface, and the interface between the hole transport layer and the hole injection layer contacts the first side surface.

4. The display panel according to claim 3, wherein: The interface between the hole transport layer and the light emitting layer is in contact with the first side surface, or the interface between the hole transport layer and the light emitting layer is in contact with the second side surface.

5. The display panel according to claim 3, wherein: A surface of the light-emitting layer on a side away from the hole transport layer is in contact with the first side surface, or a surface of the light-emitting layer on a side away from the hole transport layer is in contact with the second side surface.

6. The display panel according to claim 5, wherein: The light-emitting layer is in direct contact with the first side surface, the first top surface, and the second side surface.

7. The display panel according to claim 3, wherein: A width of the first top surface is greater than or equal to a distance between the first side surface and a sidewall of the first sub-layer.

8. The display panel according to any one of claims 1 to 7, characterized in that: The hydrophobicity of a side of the second sublayer away from the pixel electrode layer is greater than the hydrophobicity of a side of the second sublayer close to the pixel electrode layer.

9. The display panel according to any one of claims 1 to 7, wherein: The hydrophobicity of the second sub-layer is greater than that of the first sub-layer.

10. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 9.

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