Display panel, preparation method thereof and display device

Abstract

Embodiments of the present application disclose a display panel, a preparation method thereof and a display device. The display panel comprises an array substrate, a light emitting unit layer and an encapsulation layer which are stacked in sequence along a first direction, the first direction being a direction perpendicular to a plane in which the array substrate is located; the light emitting unit layer comprises an independent electrode layer, an organic light emitting functional layer and a common electrode layer which are stacked along the first direction, the independent electrode layer comprising a plurality of independent electrodes which are insulated from each other, each independent electrode and the organic light emitting functional layer and the common electrode layer forming an organic light emitting unit; the side wall of the independent electrode facing an adjacent other independent electrode is wrapped with a slope structure, the side wall of the slope structure away from the independent electrode being inclined relative to the side wall of the independent electrode; and the organic light emitting functional layer and the common electrode layer cover the slope structure. Embodiments of the present application solve the defect that the film layers between two adjacent independent electrodes are prone to be thin and broken on the side wall of the independent electrode, thereby causing short circuit, and improve the reliability of the display panel.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] Organic Light-Emitting Diode (OLED) has been widely used in electronic products, transportation and medical fields due to its low power consumption, wide viewing angle, high response speed, high resolution, wide temperature characteristics and other advantages.

[0003] The current OLED device can include a first electrode layer arranged on an array substrate, and a light-emitting functional layer, a second electrode and a packaging structure arranged in sequence on the first electrode. The distance between adjacent first electrodes is generally 1-2 microns, and the height of the first electrode layer is generally 0.1-0.2 microns. The thickness of the OLED device structure is generally about 0.2 microns, and is usually prepared by evaporation process. Due to the small density of the film layer of the evaporation process, the film layer of the OLED on the side wall of the first electrode is thin or even broken, which is easy to cause the short circuit of the first electrode and the second electrode on the side wall of the first electrode or the conduction of the first electrode from the front, resulting in the failure of the OLED device. SUMMARY

[0004] The present application provides a display panel, a preparation method thereof and a display device to solve the defects in the prior art and avoid the short circuit of the OLED device.

[0005] In a first aspect, the embodiments of the present application provide a display panel, comprising an array substrate, a light-emitting unit layer and a packaging layer which are stacked in sequence along a first direction, wherein the first direction is a direction perpendicular to the plane where the array substrate is located.

[0006] The light-emitting unit layer comprises an independent electrode layer, an organic light-emitting functional layer and a common electrode layer which are stacked along the first direction, wherein the independent electrode layer comprises a plurality of independent electrodes which are insulated from each other, and each independent electrode and the organic light-emitting functional layer and the common electrode layer constitute an organic light-emitting unit.

[0007] The side wall of the independent electrode facing the adjacent another independent electrode is wrapped with a slope structure, and the slope structure is inclined away from the side wall of the independent electrode relative to the side wall of the independent electrode; the organic light-emitting functional layer and the common electrode layer cover the slope structure.

[0008] In a second aspect, the embodiments of the present application also provide a display device comprising the display panel provided by any of the embodiments of the present application.

[0009] In a third aspect, the embodiments of the present application further provide a preparation method of the display panel, which is used for preparing the display panel provided by any of the embodiments of the present application, and the preparation method comprises:

[0010] forming an independent electrode layer on one side surface of the array substrate, the independent electrode layer comprising a plurality of independent electrodes which are insulated from each other;

[0011] forming a slope structure on a side wall of the independent electrode which faces the other independent electrode, the slope structure being inclined away from the side wall of the independent electrode relative to the side wall of the independent electrode;

[0012] sequentially forming an organic light-emitting functional layer and a common electrode layer on the independent electrode layer and the slope structure, each of the independent electrodes and the organic light-emitting functional layer and the common electrode layer constituting an organic light-emitting unit, the independent electrode, the organic light-emitting functional layer and the common electrode constituting a light-emitting unit layer;

[0013] forming an encapsulation layer on the light-emitting unit layer.

[0014] In the technical solution of the embodiments of the present application, the display panel comprises an array substrate, a light-emitting unit layer and an encapsulation layer which are sequentially stacked along a first direction, the first direction being a direction perpendicular to the plane where the array substrate is located; the light-emitting unit layer comprises an independent electrode layer, an organic light-emitting functional layer and a common electrode layer which are stacked along the first direction, the independent electrode layer comprising a plurality of independent electrodes which are insulated from each other, each of the independent electrodes and the organic light-emitting functional layer and the common electrode layer constituting an organic light-emitting unit; the side wall of the independent electrode which faces the other independent electrode is wrapped with a slope structure, the slope structure being inclined away from the side wall of the independent electrode relative to the side wall of the independent electrode; and the organic light-emitting functional layer and the common electrode layer cover the slope structure. This technical solution avoids the short circuit or the situation that the independent electrode is better conducted from the front surface due to the film layer being thinner on the side wall of the independent electrode between two adjacent independent electrodes, and can prevent the OLED device from failing, thereby improving the reliability of the OLED device.

[0015] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 a structural schematic diagram of a display panel provided by the embodiments of the present application;

[0017] Figure 2 a flowchart of a preparation method of a display panel provided by the embodiments of the present application;

[0018] Figure 3A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1.

[0019] Figure 4 A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1.

[0020] Figure 5 A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1.

[0021] Figure 6 A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1.

[0022] Figure 7 A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the accompanying drawings for the convenience of description.

[0024] The display panel provided by the embodiment of the present application can be a silicon-based OLED micro display panel, which can be applied to electronic products, medical field, transportation field and other devices with display function. The working principle of the display panel provided by the embodiment is as follows: when a voltage is applied between the independent electrode and the common electrode layer, an electric path is formed between the independent electrode and the common electrode layer, and the current flows from the common electrode layer to the independent electrode layer through the organic light-emitting functional layer. In this process, the electrons are continuously transmitted from the common electrode layer to the independent electrode through the organic light-emitting functional layer, and correspondingly, the holes are transmitted from the independent electrode to the common electrode through the organic light-emitting functional layer. In the process of electron / hole transmission, the electrons and holes in the organic light-emitting functional layer are continuously combined; in the process of electron / hole combination, the electrons release energy in the form of photons, and the display panel emits light. According to the size and resolution of the display panel, the independent electrode layer of the display panel can be provided with an unlimited number of independent electrodes, and the independent electrodes are insulated from each other. The array substrate provides electric energy for each independent electrode of the display panel, and each organic light-emitting unit emits light independently without interference. According to the different organic films provided by the organic light-emitting functional layer, the organic light-emitting unit emits light of different colors; according to the different sizes of the current, the brightness of the light is different.

[0025] Figure 1 A structure flow chart of a display panel provided by the embodiment of the present application is shown in FIG. 1. Figure 1As shown, the display panel comprises an array substrate 10, a light-emitting unit layer 20 and an encapsulation layer 30 which are sequentially stacked along a first direction which is a direction perpendicular to the plane direction of the array substrate. The light-emitting unit layer 20 comprises an independent electrode layer 21, an organic light-emitting functional layer 22 and a common electrode layer 23 which are stacked along the first direction; the independent electrode layer 21 comprises a plurality of independent electrodes which are insulated from each other, each independent electrode and the organic light-emitting functional layer 22 and the common electrode layer 23 form an organic light-emitting unit; the independent electrode 21 is wrapped with a slope structure 40 on the side wall 211 of the adjacent other independent electrode 21, the slope structure 40 is inclined relative to the side wall 211 of the independent electrode away from the side wall 401 of the independent electrode 21; the organic light-emitting functional layer 22 and the common electrode layer 23 cover the slope structure 40.

[0026] It should be noted that, Figure 1 It is only exemplarily shown that the independent electrode layer comprises two independent electrodes which are insulated from each other and form two organic light-emitting units with the organic light-emitting functional layer and the common electrode layer. In the embodiment of the present application, under the premise that the independent electrodes are insulated from each other, the display panel can comprise a plurality of independent electrodes which are insulated from each other and each independent electrode forms a plurality of organic light-emitting units with the organic light-emitting functional layer and the common electrode layer, and the number of independent electrodes can be set as required.

[0027] The technical scheme of the embodiment of the present application, the display panel comprises an array substrate, a light-emitting unit layer and an encapsulation layer which are sequentially stacked along a first direction which is a direction perpendicular to the plane direction of the array substrate; the light-emitting unit layer comprises an independent electrode layer, an organic light-emitting functional layer and a common electrode layer which are stacked along the first direction, the independent electrode layer comprises a plurality of independent electrodes which are insulated from each other, each independent electrode and the organic light-emitting functional layer and the common electrode layer form an organic light-emitting unit; the independent electrode is wrapped with a slope structure on the side wall of the adjacent other independent electrode, the slope structure is inclined relative to the side wall of the independent electrode away from the side wall of the independent electrode; the organic light-emitting functional layer and the common electrode layer cover the slope structure. The technical scheme avoids the short circuit caused by the film layer being thin on the side wall of the independent electrode between two adjacent independent electrodes or the situation that the independent electrode is better than the front surface conduction, can prevent the OLED device from failing, and improves the reliability of the OLED device.

[0028] The embodiment of the present application also provides a preparation method of a display panel for preparing the display panel provided by the embodiment of the present application. Figure 2 A flow chart of a preparation method of a display panel provided by the embodiment of the present application is shown in Figure 3 A structure flow chart of a display panel provided by the embodiment of the present application is shown in Figure 2 And Figure 3 As shown, the preparation method of the display panel comprises:

[0029] S110, forming an independent electrode layer on one side surface of the array substrate, the independent electrode layer comprising a plurality of independent electrodes insulated from each other.

[0030] Referring to Figure 3 of a), wherein the array substrate can use single crystal silicon; the independent electrode layer 21 can use materials with high work function, such as indium tin oxide (ITO), indium zinc oxide (IZO), platinum (Pt), silicon (Si), etc., preferably, the independent electrode layer 21 can be made by a complementary metal oxide semiconductor integrated circuit design process, i.e. CMOS process, on a single crystal silicon substrate; the material and preparation method of the independent electrode layer 21 include but are not limited to the above, and the present embodiment does not limit the material and preparation method of the independent electrode layer 21.

[0031] S120, forming a slope structure on the side wall of the independent electrode facing the adjacent other independent electrode, the slope structure being inclined away from the side wall of the independent electrode relative to the side wall of the independent electrode.

[0032] Referring to Figure 3 of a) and b), wherein the slope structure 40 can be made by an exposure and development process of an insulating material such as organic glue. The slope structure 40 is arranged on the side wall 211 of the adjacent two independent electrodes and is inclined away from the side wall 211 of the independent electrode relative to the side wall 211 of the independent electrode, so that when the organic light-emitting functional layer 22 is prepared, the organic light-emitting functional layer 22 can uniformly wrap the independent electrode 21, avoiding the film layer of the prepared organic light-emitting functional layer 22 and the common electrode layer 23 being thin on the side wall 211 of the independent electrode, thereby causing short circuit or better independent electrode front conduction, and improving the reliability of the display panel.

[0033] S130, sequentially forming an organic light-emitting functional layer and a common electrode layer on the independent electrode layer and the slope structure, each independent electrode and the organic light-emitting functional layer and the common electrode layer forming an organic light-emitting unit, and the independent electrode layer, the organic light-emitting functional layer and the common electrode forming a light-emitting unit layer.

[0034] Referring to Figure 3 of c) and d), wherein the organic light-emitting functional layer 22 can be an organic matter with good electron hole transport capacity, such as 8-hydroxyquinoline aluminum (Alq3) and the like; the method for preparing the organic light-emitting functional layer 22 can include but is not limited to spin coating, vacuum evaporation, vapor deposition, inkjet printing and the like. The common electrode layer 23 can be a material with low work function, such as silver (Ag), magnesium silver alloy and the like; the preparation method of the common electrode layer 23 includes but is not limited to screen printing, vacuum evaporation and the like.

[0035] S140, forming an encapsulation layer on the light-emitting unit layer.

[0036] Referring to Figure 3e) the figure, wherein the encapsulation layer 30 can be realized by organic glass or metal cover plate encapsulation, thin film encapsulation, frit sealing, etc. The encapsulation layer 30 can prevent water and oxygen and dust from contacting the common electrode layer 23 and even the organic light-emitting functional layer 22, so as to prevent bubbles from appearing on the electrode of the display panel, so that the display panel has black spots in the light-emitting area when working, the display panel is accelerated to age, and the stability of the display panel is reduced.

[0037] It should be noted that the materials and preparation methods of the film layers of the display panel mentioned in the embodiment, such as the independent electrode, the organic light-emitting functional layer, the common electrode layer, the slope structure, and the encapsulation layer, are only examples, and the embodiment does not limit them, as long as the materials and preparation methods of the film layers can achieve the corresponding technical effects.

[0038] For example, an independent electrode layer 21 composed of a plurality of mutually insulated independent electrodes is first prepared on one side surface of the array substrate 10 by a COMS process. Specifically, the independent electrode pixels are made on one side surface of a single crystal silicon by using a photoetching process, and then metal anode film plating is performed. Then, the independent electrode side wall 211 is coated with organic glue with a certain height, and after the organic glue is exposed and developed, the slope structure 40 inclined away from the independent electrode side wall and opposite to the independent electrode side wall is formed. For reference, see Figure 2 a) shown; then the organic light-emitting functional layer 22 and the common electrode layer 23 are prepared on the independent electrode and the slope structure 40 in sequence, so that the organic light-emitting functional layer 22 and the common electrode layer 23 cover the slope structure 40, and the independent electrode layer 21, the organic light-emitting functional layer 22, and the common electrode group 23 form the light-emitting unit layer 20. Finally, the encapsulation layer 30 is formed on the light-emitting unit layer 20.

[0039] In the embodiment, the independent electrode layer is prepared on one side surface of the array substrate, the slope structure opposite to the independent electrode side wall is prepared on the independent electrode side wall, and then the organic light-emitting functional layer, the common electrode layer, and the encapsulation layer are prepared on the independent electrode and the slope structure in sequence, so that the organic light-emitting functional layer and the common electrode layer can uniformly wrap the independent electrode, avoiding the prepared organic light-emitting functional layer and the common electrode layer from being thin on the independent electrode side wall, so as to cause short circuit or better independent electrode front conduction, thereby improving the reliability of the display panel. The encapsulation layer formed on the organic light-emitting functional layer can prevent water and oxygen and dust from contacting the light-emitting unit layer, thereby accelerating the aging of the display panel and improving the stability of the display panel.

[0040] Optionally, as shown in Figure 4 in the first direction of the display panel, the top of the slope structure 40 is located between the two side surfaces of the organic light-emitting functional layer 22.

[0041] Corresponding to the preparation method of the display panel, the preparation method further comprises, after the independent electrode process is completed, limiting the slope structure, referring to Figure 5 and Figure 7 a) shown in the figure, the method specifically comprises:

[0042] S210, forming an independent electrode layer on one side surface of the array substrate, the independent electrode layer comprising a plurality of independent electrodes insulated from each other.

[0043] S221, coating organic glue between adjacent independent electrodes, the organic glue being higher than the independent electrodes.

[0044] S222, exposing and developing the organic glue to form a slope structure on the opposite side wall of each adjacent independent electrode.

[0045] The organic glue is of insulating material, and is used to prevent short circuit between the independent electrode and the common electrode on the side wall of the independent electrode.

[0046] S230, sequentially forming an organic light-emitting functional layer and a common electrode layer on the independent electrode layer and the slope structure, each independent electrode and the organic light-emitting functional layer and the common electrode layer constituting an organic light-emitting unit, the independent electrode layer, the organic light-emitting functional layer and the common electrode constituting a light-emitting unit layer.

[0047] S240, forming an encapsulation layer on the light-emitting unit layer.

[0048] In the embodiment, the top of the slope structure is arranged between the side surfaces of the organic light-emitting functional layer, so that the connection between the organic light-emitting functional layers of two adjacent organic light-emitting units is thin, and even the organic light-emitting functional layers of the two adjacent organic light-emitting units are disconnected, further avoiding the problems of short circuit between the film layers of the two adjacent independent electrodes on the side wall of the independent electrode or better conduction of the independent electrode from the front surface, easy to cause crosstalk, and improving the resolution of the display panel. At the same time, the slope structure is prepared by using organic glue, and the structure can be completed by only one exposure and development technology, and there is no problem of photoresist residue or over-etching, and the process is simple and reliable.

[0049] Optionally, continuing to refer to Figure 4 , the side of the array substrate 10 facing the light-emitting unit layer 20 comprises a planarization layer 50; the planarization layer 50 comprises a plurality of pits 51, and the vertical projection of the independent electrode 21 on the plane where the planarization layer 50 is located does not overlap the pit 51; the slope structure 40 extends into the pit 51 in the first direction.

[0050] The flattening layer 50 is an insulating layer, which can be an organic insulating layer. The flattening layer 50 can be provided with a connecting wire, and the array substrate 10 can be electrically connected to each independent electrode 21 through the flattening layer 50 to supply power to the independent electrode 21. It should be noted that the independent electrodes 21 are not electrically connected to each other and are insulated from each other, that is, each independent electrode 21 works independently and does not interfere with each other.

[0051] Corresponding to the preparation method of the display panel, the preparation method further comprises, after the independent electrode process is completed, limiting the slope structure, for reference Figure 6 and Figure 7 The method specifically comprises the following steps:

[0052] S310, forming an independent electrode layer on one side surface of the array substrate, the independent electrode layer comprising a plurality of independent electrodes insulated from each other.

[0053] S321, when the organic glue is coated between the adjacent independent electrodes, the organic glue is coated between the recess and the adjacent independent electrode.

[0054] S322, exposing and developing the organic glue to form a slope structure on the side wall of the independent electrode facing the other adjacent independent electrode and in the recess.

[0055] The slope structure 40 is formed on the side wall 211 of the independent electrode 21 facing the other adjacent independent electrode and in the recess 51 by exposing and developing, which can lengthen the transmission path of the electrons in the organic light-emitting functional layer between two organic light-emitting units, avoid electrical conduction between two adjacent organic light-emitting units, prevent color mixing, and improve the clarity of the display panel.

[0056] S330, sequentially forming an organic light-emitting functional layer and a common electrode layer on the independent electrode layer and the slope structure, each independent electrode and the organic light-emitting functional layer and the common electrode layer forming an organic light-emitting unit, and the independent electrode layer, the organic light-emitting functional layer, and the common electrode forming a light-emitting unit layer.

[0057] S340, forming an encapsulation layer on the light-emitting unit layer.

[0058] In this embodiment, when the slope structure is prepared, the slope structure extends into the recess in the first direction, which can lengthen the transmission path of the electrons in the organic light-emitting functional layer, avoid electrical conduction between two adjacent light-emitting units, further prevent color mixing between two adjacent light-emitting units, and affect the clarity of the display panel.

[0059] Optionally, as Figure 4As shown, the included angle a between the sidewall 41 of the slope structure 40 away from the independent electrode and the sidewall 211 of the independent electrode is greater than or equal to 30°, so as to effectively avoid the short circuit caused by the thinning of the film layer on the sidewall of the independent electrode between two adjacent independent electrodes, or the better front conduction of the independent electrode, and prevent the crosstalk between two adjacent light emitting units. When a is less than 30°, the slope structure is too steep, and the technical effect achieved by the technical solution without the slope structure is equivalent, and the technical problem of the failure of the display panel caused by the short circuit between the independent electrode and the common electrode cannot be solved.

[0060] Optionally, with reference to Figure 4 , the display panel further comprises a barrier wall structure 60, the barrier wall structure 60 is located on the side of the encapsulation layer 30 away from the light emitting unit layer 20; the vertical projection of the barrier wall structure 60 on the plane where the light emitting unit layer 20 is located does not overlap the organic light emitting unit 20.

[0061] The barrier wall structure 60 can be formed by an exposure and development process. By setting the barrier wall structure 60, the light emitted by each organic light emitting unit 20 can be vertically emitted upwards, and color mixing can be avoided. In addition, the existence of the barrier wall structure 60 can also improve the display viewing angle problem.

[0062] Optionally, Figure 5 and Figure 7 In the a) view of the above, the common electrode layer 23 is a metal film layer or a metal oxide film layer, and the encapsulation layer 30 is a tetrafluoroethylene film layer.

[0063] The material of the common electrode layer 23 can include but is not limited to silver (Ag) or indium zinc oxide (IZO), etc., and the common electrode layer is used to establish electrical connection with the independent electrode layer.

[0064] For example, when a voltage is applied to the independent electrode layer and the common electrode layer, an electrical path is formed between the independent electrode layer and the common electrode layer, and the current flows from the common electrode layer to the independent electrode layer through the organic light emitting functional layer. In the process of electron transmission, the combination of electrons and holes in the organic light emitting functional layer is continuous, and in this process, the electrons release energy in the form of photons, and the display panel emits light.

[0065] In the embodiment, the display panel comprises an array substrate, a light-emitting unit layer and an encapsulation layer which are sequentially stacked along a first direction, the first direction being a direction perpendicular to a plane where the array substrate is located; the light-emitting unit layer comprises an independent electrode layer, an organic light-emitting functional layer and a common electrode layer which are stacked along the first direction, the independent electrode layer comprising a plurality of independent electrodes which are insulated from each other, each independent electrode and the organic light-emitting functional layer and the common electrode layer forming an organic light-emitting unit; the independent electrode is wrapped with a slope structure on a side wall of the independent electrode facing an adjacent independent electrode, the side wall of the slope structure away from the independent electrode being inclined relative to the side wall of the independent electrode; the organic light-emitting functional layer and the common electrode layer cover the slope structure, avoiding the film layer of the organic light-emitting functional layer and the common electrode layer being too thin on the side wall of the independent electrode, thus causing short circuit or better front-on conduction of the independent electrode, and improving the reliability of the display panel. By extending the slope structure to the organic light-emitting functional layer and sinking the slope structure to the planarization layer, the organic light-emitting functional layer is disconnected between two adjacent independent light-emitting units, and the transmission path of electrons in the organic light-emitting functional layer is extended, thus further avoiding crosstalk between the two independent light-emitting units and improving the color gamut of the display panel. After encapsulation, a barrier structure is formed, so that the light emitted by the two independent light-emitting units propagates vertically upward, further preventing crosstalk, and further improving the viewing angle of the display panel.

[0066] Based on the same concept, the embodiment of the present application also provides a display device comprising the display panel provided by the embodiment of the present application. Therefore, the display device has the technical features of the display panel provided by the embodiment of the present application, and can achieve the beneficial effects of the display panel provided by the embodiment of the present application. The same parts can be referred to the description above.

[0067] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments, mutual combinations and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, It includes an array substrate, a light-emitting unit layer and an encapsulation layer stacked sequentially along a first direction, wherein the first direction is a direction perpendicular to the plane in which the array substrate is located; The light-emitting unit layer includes an independent electrode layer, an organic light-emitting functional layer, and a common electrode layer stacked along the first direction. The independent electrode layer includes a plurality of mutually insulated independent electrodes, and each of the independent electrodes, together with the organic light-emitting functional layer and the common electrode layer, constitutes an organic light-emitting unit. The sidewall of each independent electrode facing the adjacent independent electrode is wrapped with a ramp structure, the ramp structure being inclined relative to the sidewall of the independent electrode away from the sidewall of the independent electrode; the ramp structure is made of insulating material, and its height in the first direction is greater than the thickness of the independent electrode; the organic light-emitting functional layer and the common electrode layer cover the ramp structure; The array substrate includes a planarization layer on the side facing the light-emitting unit layer; the planarization layer includes multiple pits, and the vertical projection of the independent electrode on the plane of the planarization layer does not overlap with the pits; The ramp structure extends into the recess in the first direction.

2. The display panel according to claim 1, characterized in that, In the first direction, the top of the ramp structure is located between the two side surfaces of the organic light-emitting functional layer.

3. The display panel according to claim 1, characterized in that, The angle α between the sidewall of the slope structure that is away from the independent electrode and the sidewall of the independent electrode is ≥30°.

4. The display panel according to claim 1, characterized in that, The display panel also includes a barrier structure, which is located on the side of the encapsulation layer opposite to the light-emitting unit layer; The vertical projection of the barrier structure onto the plane where the light-emitting unit layer is located does not overlap with the organic light-emitting unit.

5. The display panel according to claim 1, characterized in that, The common electrode layer is a metal film or a metal oxide film, and the encapsulation layer is a tetrafluoroethylene film.

6. A display device, characterized in that, Includes the display panel as described in any one of claims 1-5.

7. A method for manufacturing a display panel, characterized in that, The method for preparing a display panel as described in any one of claims 1-5 includes: An independent electrode layer is formed on one side surface of the array substrate, the independent electrode layer comprising a plurality of mutually insulated independent electrodes; A ramp structure is formed on the sidewall of the independent electrode facing the adjacent independent electrode, the ramp structure being inclined relative to the sidewall of the independent electrode away from the sidewall of the independent electrode; An organic light-emitting functional layer and a common electrode layer are sequentially formed on the independent electrode layer and the slope structure. Each independent electrode, together with the organic light-emitting functional layer and the common electrode layer, constitutes an organic light-emitting unit. The independent electrode, the organic light-emitting functional layer, and the common electrode form a light-emitting unit layer. An encapsulation layer is formed on the light-emitting unit layer.

8. The preparation method according to claim 7, characterized in that, A ramp structure is formed on the sidewall of the independent electrode facing the adjacent independent electrode, comprising: An organic adhesive is coated between adjacent individual electrodes, the organic adhesive being higher than the individual electrodes; The organic adhesive is exposed and developed to form the ramp structure on the opposite sidewalls of the adjacent independent electrodes.

9. The preparation method according to claim 8, characterized in that, The array substrate includes a planarization layer on the side facing the light-emitting unit layer; the planarization layer includes multiple pits, and the vertical projection of the independent electrode on the plane of the planarization layer does not overlap with the pits; Applying an organic adhesive between adjacent independent electrodes includes: The organic adhesive is coated between the recess and the adjacent individual electrodes; The organic adhesive is exposed and developed to form the ramp structure on the opposite sidewalls of adjacent independent electrodes, including: The organic adhesive is exposed and developed to form the ramp structure on the sidewall of the independent electrode facing the adjacent independent electrode and in the pit.

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