Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel, a preparation method thereof and a display device. The display panel includes: a substrate; the first electrode layer, the light-emitting functional layer and the second electrode layer are sequentially stacked in the direction away from the substrate; the isolation structure is arranged between the substrate and the first electrode layer; the isolation structure is encircled to form a first isolation opening; the first electrode layer, the light-emitting function layer and the second electrode layer at least extend to the side, away from the substrate, of the isolation structure from the interior of the first isolation opening. The light-emitting area of the light-emitting device is increased.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] With the continuous development of display technology, people have higher and higher requirements for display panels, such as high resolution, high stability, high aperture ratio, high screen-to-body ratio, etc. However, in the prior art, due to the limitation of the structural design of the display panel, the light-emitting area of ​​its light-emitting device needs to be further improved. Summary of the invention

[0003] The present invention provides a display panel and a manufacturing method thereof, and a display device, so as to increase the light emitting area of ​​a light emitting device.

[0004] To achieve the above technical objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A display panel, comprising:

[0006] substrate;

[0007] A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked in a direction away from the substrate;

[0008] An isolation structure, the isolation structure is disposed between the substrate and the first electrode layer; the isolation structure encloses a first isolation opening;

[0009] The first electrode layer, the light-emitting functional layer and the second electrode layer extend from the first isolation opening at least to a side of the isolation structure away from the substrate.

[0010] Optionally, the display panel further includes:

[0011] A first planarization layer, wherein the first planarization layer is at least disposed on a side of the isolation structure close to the first isolation opening, and the first planarization layer is provided with a first opening, and the first opening is disposed in the first isolation opening;

[0012] The first electrode layer is connected to the substrate through the first opening;

[0013] Preferably, the orthographic projection of the first electrode layer on the substrate is located within the orthographic projection of the first planarization layer on the substrate.

[0014] Optionally, the first planarization layer at least covers the sidewalls of the first isolation opening;

[0015] Preferably, the first planarization layer covers the sidewalls of the first isolation opening, and covers a portion of the isolation structure on a side away from the substrate;

[0016] Preferably, the first electrode layer covers the sidewalls of the first opening, and covers a portion of the first planarization layer disposed on a side of the isolation structure away from the substrate;

[0017] Preferably, there is a first set interval between an edge of the first planarization layer away from the first opening and an edge of the isolation structure away from the first isolation opening.

[0018] Optionally, the display panel further includes:

[0019] A pixel definition layer is provided on a side of the isolation structure away from the substrate, and the pixel definition layer is at least partially provided between the light-emitting functional layer and the first electrode layer, and the pixel definition layer is provided with a pixel opening, and the orthographic projection of the pixel opening on the substrate covers and is larger than the orthographic projection of the first isolation opening on the substrate;

[0020] Preferably, the pixel definition layer covers an edge of the first electrode layer disposed on a side of the isolation structure away from the substrate and away from the first opening, and covers an edge of the first planarization layer disposed on a side of the isolation structure away from the substrate and away from the first opening;

[0021] Preferably, part of the pixel definition layer is disposed between the light-emitting functional layer and the isolation structure;

[0022] Preferably, there is a second set interval between an edge of the pixel definition layer away from the pixel opening and an edge of the isolation structure away from the first isolation opening.

[0023] Optionally, the display panel further includes:

[0024] a second planarization layer, the second planarization layer being disposed between the isolation structure and the substrate; the second planarization layer comprising a second opening, an orthographic projection of the second opening on the substrate overlapping an orthographic projection of the first isolation opening on the substrate;

[0025] Preferably, the orthographic projection of the second opening on the substrate covers and is larger than the orthographic projection of the first opening on the substrate.

[0026] Optionally, the display panel further includes:

[0027] A second isolation opening, wherein in a direction perpendicular to the thickness of the display panel, the second isolation opening, the isolation structure and the first isolation opening are alternately arranged in sequence;

[0028] The second electrode layer is connected to the isolation structure through the second isolation opening.

[0029] Optionally, the light-emitting functional layer at least covers a surface of the first electrode layer away from the substrate;

[0030] Preferably, the orthographic projection of the light-emitting functional layer on the substrate covers the orthographic projection of the first electrode layer on the substrate, and covers the orthographic projection of the isolation structure on the substrate;

[0031] Preferably, the light-emitting functional layer is disconnected at a side of the isolation structure away from the substrate and at a connection with the second isolation opening;

[0032] Preferably, the display panel also includes a second planarization layer, which is arranged between the isolation structure and the substrate, and the orthographic projection of the second planarization layer on the substrate overlaps with the second isolation opening; in the second isolation opening, the light-emitting functional layer is arranged on a side of the second planarization layer away from the substrate.

[0033] Optionally, the second electrode layer covers the light-emitting functional layer, and at least partially covers a side wall of the isolation structure close to the second isolation opening;

[0034] Preferably, the second electrode layer covers the entire display panel;

[0035] Alternatively, the first electrode layer includes a first electrode, the light-emitting layer includes a light-emitting portion, and the second electrode layer includes a second electrode; the first electrode, the light-emitting portion and the second electrode constitute a light-emitting device; the display panel includes a plurality of light-emitting devices, and the second electrodes of two adjacent light-emitting devices are disconnected within the second isolation opening to form an insulating opening.

[0036] Correspondingly, the present invention further provides a display device including: a display panel as described in any embodiment of the present invention.

[0037] Accordingly, the present invention also provides a method for preparing a display panel, comprising:

[0038] providing a substrate;

[0039] forming an isolation structure on the substrate, wherein the isolation structure encloses a first isolation opening, and the first isolation opening exposes the substrate;

[0040] forming a first electrode layer, wherein the first electrode layer extends from the first isolation opening to a side of the isolation structure away from the substrate; the first electrode layer is connected to the substrate through the first isolation opening;

[0041] A light-emitting functional layer and a second electrode layer are formed on a side of the first electrode layer away from the substrate. The light-emitting functional layer and the second electrode layer extend from the first isolation opening to a side of the isolation structure away from the substrate.

[0042] In the embodiment of the present invention, the first electrode layer and the light-emitting functional layer and the second electrode layer disposed on the first electrode layer are disposed on one side of the isolation structure principle substrate, and compared with the comparative example, the arrangement positions of the isolation structure and the film layers related to the light-emitting device (including the first electrode layer, the light-emitting functional layer and the second electrode layer) are adjusted. In this way, the arrangement of the isolation structure does not occupy the light-emitting area of ​​the light-emitting device, that is, the light-emitting area of ​​the light-emitting device is not limited by the opening area of ​​the isolation structure, thereby significantly increasing the light-emitting area of ​​the light-emitting device and improving the display effect.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic diagram of a comparative example provided for an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a structure in which a cathode overlap abnormality occurs in a comparative example provided by an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention;

[0048] Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure of AA;

[0049] Figure 5 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0050] Figure 6 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0051] Figure 7 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0052] Figure 8 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0053] Fig. 9 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0054] Fig.10 A schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0055] Figure 11-Figure 19 A schematic structural diagram of each step of a method for manufacturing a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0058] As described in the background technology, the existing display panel has the problem of abnormal single pixel display. The inventors have found that the reason for this problem is that for a display panel with an isolation structure, due to the high requirements of the existing process on the evaporation angle and the existence of process fluctuations, the cathode and the isolation structure will overlap abnormally, thereby causing the problem of abnormal single pixel display. The specific analysis is as follows in conjunction with the accompanying drawings.

[0059] Figure 1 This is a schematic diagram of a comparative example provided by an embodiment of the present invention. Figure 1, the display panel includes an isolation structure 110, the isolation structure 110 includes an isolation opening 111, and the relevant film layers of the light-emitting device 120 (including the anode 121, the light-emitting functional part 122 and the cathode 123) are all arranged in the isolation opening 111. Among them, the anode 121 provides a driving signal through the array substrate at the bottom; the cathode 123 overlaps with the bottom of the isolation structure 110, and receives the cathode signal through the isolation structure 110. The isolation structure 110 has a certain thickness. Specifically, the thickness of the isolation structure 110 is greater than the thickness of the cathode 123. When preparing the display panel, after the isolation structure 110 is prepared, the light-emitting functional part 122 can be evaporated using the isolation structure 110 as a mask, and then the light-emitting functional part 122 of the adjacent light-emitting device 120 can be separated at the isolation structure 110 through the isolation structure 110. Similarly, after the light-emitting functional part 122 is prepared, the cathode 123 is evaporated using the isolation structure 110 as a mask. However, due to Figure 1 It can be seen that, limited by the opening area of ​​the isolation structure 110 , the light-emitting area of ​​the light-emitting device 120 is at most the opening area of ​​the isolation structure 110 .

[0060] Figure 2 A schematic diagram of a structure in which a cathode overlap abnormality occurs in a comparative example provided by an embodiment of the present invention. Figure 2 Furthermore, with the existing display panel structure, due to process fluctuations, it is difficult to control the evaporation angle of the organic material when evaporating the light-emitting functional portion 122, resulting in the evaporation area of ​​the light-emitting functional portion 122 being too large, overlapping with the bottom of the isolation structure 110, blocking the overlap of the cathode 123, resulting in abnormal overlap between the cathode 123 and the isolation structure 110, thereby causing the light-emitting device 120 to display abnormally.

[0061] It can be seen that the light-emitting device of the display panel structure provided by the prior art has a small light-emitting area, and the structure of the existing display panel has high requirements for the evaporation angle of the evaporation process. In the presence of process fluctuations, the display panel will have single-pixel display abnormalities, thereby increasing the risk of defects.

[0062] In view of this, an embodiment of the present invention provides a display panel, which is firstly beneficial to increase the light emitting area of ​​the light emitting device. Figure 3 A schematic diagram of a top view of a display panel provided by an embodiment of the present invention is shown. Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure of AA. Figure 3 and Figure 4 , the display panel comprises:

[0063] substrate 230;

[0064] A first electrode layer 240, a light-emitting functional layer 250 and a second electrode layer 260 are sequentially stacked in a direction away from the substrate 230;

[0065] An isolation structure 210 , which is disposed between the substrate 230 and the first electrode layer 240 ; the isolation structure 210 surrounds a first isolation opening 211 ;

[0066] The first electrode layer 240 , the light-emitting functional layer 250 and the second electrode layer 260 extend from the first isolation opening 211 at least to a side of the isolation structure 210 away from the substrate 230 .

[0067] Among them, from Figure 4 From the perspective shown, the side of the isolation structure 210 away from the substrate 230 is the top of the isolation structure 210 , that is, the first electrode layer 240 , the light-emitting functional layer 250 and the second electrode layer 260 extend from the first isolation opening 211 at least to the top of the isolation structure 210 .

[0068] Specifically, in the comparative example, the relevant film layers of the light-emitting device 120 (including the anode 121, the light-emitting functional part 122 and the cathode 123) are all located inside the isolation opening 111 of the isolation structure 110, and the light-emitting area is less than or equal to the opening area of ​​the isolation structure 210. In the embodiment of the present invention, the first electrode layer 240 and the light-emitting functional layer 250 and the second electrode layer 260 disposed on the first electrode layer 240 are disposed on the side of the isolation structure 210 away from the substrate 230, and the arrangement positions of the film layers related to the isolation structure 210 and the light-emitting device 220 (including the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260) are adjusted compared with the comparative example. In this way, the arrangement of the isolation structure 210 does not occupy the light-emitting area of ​​the light-emitting device 220, that is, the light-emitting area of ​​the light-emitting device 220 is not limited by the opening area of ​​the isolation structure 210 (that is, the first isolation opening 211), thereby significantly increasing the light-emitting area of ​​the light-emitting device 210 and improving the display effect.

[0069] Further, based on the above embodiment, the embodiment of the present invention is also helpful to improve the problem of abnormal display of the light emitting device 120 in the comparative example. Figure 3 and Figure 4 Optionally, the display panel further includes a second isolation opening 212. In a thickness direction perpendicular to the display panel, the second isolation opening 212, the isolation structure 210 and the first isolation opening 211 are alternately arranged in sequence. The thickness direction of the display panel is direction P. Figure 4 The viewing angle shown is the longitudinal direction; the direction perpendicular to the thickness of the display panel is the direction Q, from Figure 4The viewing angle shown is the lateral direction. That is, in the lateral direction, the second isolation opening 212, the isolation structure 210 and the first isolation opening 211 are arranged alternately in sequence. From the above analysis, it can be seen that the first isolation opening 211 is an opening for accommodating the light-emitting device 220; different from the first isolation opening 211, the second isolation opening 212 is an opening arranged between adjacent light-emitting devices 220, and the second electrode layer 260 is connected to the isolation structure 210 through the second isolation opening 212. Among them, the first isolation opening 211 and the second isolation opening 212 are respectively located on both sides of the isolation structure 210, and the side wall of the first isolation opening 211 is the side wall of one side of the isolation structure 210; the side wall of the second isolation opening 212 is the side wall of the other side of the isolation structure 210. The second electrode layer 260 is connected to the isolation structure 210 through the second isolation opening 212. Specifically, the second electrode layer 260 overlaps with the side wall of the isolation structure 210 through the opening space of the second isolation opening 212.

[0070] Among them, from Figure 4 From the perspective shown, the second electrode layer 260 extends from the first isolation opening 211 to the top of the isolation structure 210 and further extends into the second isolation opening 212 so that the second electrode layer 260 is connected to the side wall of the isolation structure 210 through the opening space of the second isolation opening 212 .

[0071] Exemplarily, in the process of preparing the display panel, the isolation structure 210 is still used as a mask to evaporate the light-emitting functional layer 250 and the second electrode layer 260. Specifically, in the comparative example, the portion where the isolation structure 110 acts as a mask is the isolation opening 111 where the light-emitting device 120 is set, and the evaporation angle needs to be accurately adjusted to ensure that the evaporation area of ​​the cathode 123 is larger than the light-emitting functional portion 122. In the embodiment of the present invention, the portion where the isolation structure 210 acts as a mask is the second isolation opening 212 where the light-emitting device 220 is not set. When evaporating the light-emitting functional layer 250, the light-emitting functional layer 250 is disconnected at the side of the isolation structure 210 away from the substrate 230 and at the connection with the second isolation opening 212. The advantage of such a setting is that since the light-emitting device 220 is centered on the first isolation opening 211, the evaporation angle is the first angle, and its direction is the first direction X, the accuracy requirement for the area of ​​the light-emitting functional layer 250 set in the second isolation opening 212 is relatively low, thereby reducing the requirement for the evaporation angle when evaporating the light-emitting functional layer 250. When evaporating the second electrode layer 260, since the second electrode layer 260 needs to be connected to the side wall of the second isolation opening 212, the evaporation angle is the second angle, the direction of which is the second direction Y, and the first direction X and the second direction Y are in opposite directions relative to the normal line O. Therefore, the light-emitting functional layer 250 in the second isolation opening 212 is not likely to affect the overlap between the second electrode layer 260 and the isolation structure 210, thereby reducing the requirements for the evaporation angle.

[0072] It can be seen that the embodiment of the present invention is beneficial to increase the light-emitting area of ​​the light-emitting device 210. By adding the second isolation opening 212 on the display panel, the isolation structure 210 can be partitioned at the side wall close to the second isolation opening 212 during the evaporation process of the light-emitting functional layer 250. In this way, during the evaporation process of the light-emitting functional layer 250, the evaporation angles of the light-emitting functional layer 250 and the second electrode layer 260 are inclined in opposite directions. Even if there are process fluctuations, the evaporation of the light-emitting functional layer 250 will not affect the overlap between the second electrode layer 260 and the isolation structure 210. In addition, during the evaporation process of the second electrode layer 260, the shadow process window of the evaporation is increased, and the second electrode layer 260 can be reliably overlapped with the isolation structure 210. Therefore, the embodiment of the present invention improves the problem of abnormal display of the light-emitting device 210, reduces the requirements of the preparation process on the organic evaporation angle, and improves the yield.

[0073] It should be noted that Figure 3 In order to clearly illustrate the positional relationship among the isolation structure 210 , the first isolation opening 211 , and the second isolation structure 212 in the embodiment of the present invention, other film layers are not drawn in the top view.

[0074] It should be noted that, in the above-mentioned embodiments, the second electrode layer 260 is exemplarily shown to overlap the side wall of the isolation structure 210 close to the second isolation opening 212, which is not a limitation of the present invention. In other embodiments, the second electrode layer 260 may also be connected to the side of the isolation structure 210 away from the substrate 230 (i.e., the top of the isolation structure 210).

[0075] Based on the above embodiments, optionally, there are multiple ways to arrange the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260, which are described in detail below but are not intended to limit the present invention.

[0076] Continue to see Figure 4 In one embodiment, optionally, the display panel further includes a first planarization layer 270, the first planarization layer 270 is at least arranged on one side of the isolation structure 210 close to the first isolation opening 211, and the first planarization layer 270 is provided with a first opening 271, and the first opening 271 is arranged in the first isolation opening 211; the first electrode layer 240 is connected to the substrate 230 through the first opening 271.

[0077] The first opening 271 is disposed in the first isolation opening 211, which means that the orthographic projection of the first opening 271 on the substrate 230 is completely covered by the orthographic projection of the first isolation opening 211 on the substrate 230. The provision of the first planarization layer 270 can play the role of insulation and planarization. Specifically, the first planarization layer 270 can insulate the first electrode layer 240 and the isolation structure 210, and the preparation of the first planarization layer 270 before the first electrode layer 240 is conducive to a flatter first electrode layer 240, thereby facilitating the display effect.

[0078] And, from Figure 4 From the perspective shown, the portion of the first electrode layer 240 disposed at the bottom of the first opening 271 is used to receive a driving signal from the substrate 230. Specifically, an array layer is disposed on the substrate 230, and the array layer may be, for example, a film layer provided with devices such as transistors or capacitors, and the transistors and capacitors constitute a pixel circuit. The first electrode layer 240 is electrically connected to the pixel circuit in the substrate 230 through the first isolation opening 211, and receives a driving signal sent by the pixel circuit. This arrangement is conducive to ensuring the stability and reliability of the signal transmission of the display panel.

[0079] Continue to see Figure 4 In one embodiment, optionally, the first planarization layer 270 at least covers the sidewalls of the first isolation opening 211. The sidewalls of the first isolation opening 211 are the sidewalls of the isolation structure 210. Covering the sidewalls of the isolation structure 210 with the sidewalls of the first planarization layer 270 is equivalent to planarizing the most uneven part of the isolation structure 210, which is beneficial to making the first electrode layer 240 more flat, thereby facilitating the display effect.

[0080] Continue to see Figure 4 In one embodiment, optionally, the first planarization layer 270 covers the sidewalls of the first isolation opening 211, and covers a portion of the area on the side of the isolation structure 210 away from the substrate 230. This arrangement is equivalent to the first planarization layer 270 extending from the sidewalls of the first isolation opening 211 to the side of the isolation structure 210 away from the substrate 230. This arrangement is conducive to increasing the contact area between the first planarization layer 270 and the isolation structure 210, thereby increasing the area of ​​the planarization region below the first electrode layer 240.

[0081] Continue to see Figure 4 In one embodiment, optionally, there is a first set interval d1 between the edge of the first planarization layer 270 away from the first opening 271 and the edge of the isolation structure 210 away from the first isolation opening 211. This configuration is conducive to contacting other film layers of the display panel with the isolation structure 210 to enhance the adhesion between the film layers.

[0082] Based on the various configurations of the first planarization layer 270, the first electrode layer 240 can be configured in various ways, and preferably the orthographic projection of the first electrode layer 240 on the substrate 230 is located within the orthographic projection of the first planarization layer 270 on the substrate 230. This configuration is conducive to ensuring that the first planarization layer 270 can well insulate the first electrode layer 240 and the isolation structure 210, and the first planarization layer 270 is prepared before the first electrode layer 240, which is conducive to making the entire film layer of the first electrode layer 240 flatter, thereby facilitating the display effect.

[0083] Continue to see Figure 4 In one embodiment, optionally, the first electrode layer 240 covers the sidewalls of the first opening 271 , and covers a portion of the first planarization layer 270 disposed on a side of the isolation structure 210 away from the substrate 230 .

[0084] Specifically, the first electrode layer 240 extends from the first opening 271 to the side of the first planarization layer 270 away from the substrate 230, and there is a third set interval d3 between the edge of the first electrode layer 240 away from the first opening 271 and the edge of the isolation structure 210 away from the first isolation opening 211. This arrangement makes the area of ​​the first electrode layer 240 larger, which is conducive to providing a possibility for increasing the light-emitting area of ​​the light-emitting device 220. In addition, the first electrode layer 240 does not extend into the second isolation opening 212, and the setting of the third set interval d3 is conducive to avoiding crosstalk between light-emitting devices 220 of different colors.

[0085] It should be noted that in Figure 4 In the embodiment, the first electrode layer 240 is in a stepped shape. Specifically, the first electrode layer 240 includes three parts, the first part is arranged at the bottom of the first opening 271, the second part is arranged at the side of the first planarization layer 270 away from the substrate 230, and the third part is arranged between the first part and the second part. The first part and the second part have different heights and are in a stepped shape. In actual products, these steps are small and the impact on the light-emitting effect can be ignored.

[0086] Continue to see Figure 4 In one embodiment, optionally, the display panel further includes a pixel definition layer 280, which is disposed on a side of the isolation structure 210 away from the substrate 230, and the pixel definition layer 280 is at least partially disposed between the light-emitting functional layer 250 and the first electrode layer 240, and the pixel definition layer 280 is provided with a pixel opening 281, and the orthographic projection of the pixel opening 281 on the substrate 230 covers and is larger than the orthographic projection of the first isolation opening 211 on the substrate 230.

[0087] The orthographic projection of the pixel opening 281 on the substrate 230 covers and is larger than the orthographic projection of the first isolation opening 211 on the substrate 230, which means that the pixel opening 281 is larger than the first isolation opening 211, which is beneficial to increase the light-emitting area. In addition, the area of ​​the pixel opening 281 is the light-emitting area of ​​the light-emitting device 220. The arrangement of the pixel definition layer 280 is beneficial to accurately control the size of the light-emitting area of ​​the light-emitting device 220, thereby improving the uniformity of display.

[0088] Continue to see Figure 4 In one embodiment, optionally, the pixel definition layer 280 covers the edge of the first electrode layer 240 disposed on the side of the isolation structure 210 away from the substrate 230 away from the first opening 271, and covers the edge of the first planarization layer 270 disposed on the side of the isolation structure 210 away from the substrate 230 away from the first opening 271. Specifically, there is a part of the first planarization layer 270 that is not covered by the first electrode layer 240, and the pixel definition layer 280 covers the edge of the first electrode layer 240 disposed on the side of the isolation structure 210 away from the substrate 230 away from the first opening 271, and covers the part of the first planarization layer 270 that is not covered by the first electrode layer 240. In this way, the orthographic projection of the pixel opening 281 on the substrate 230 is located within the orthographic projection of the first electrode layer 240 on the substrate 230, thereby ensuring that the first electrode layer 240 is larger than the light emitting area of ​​the light emitting device 220, providing a stable voltage signal for the light emitting device 220, and facilitating the increase of the area of ​​the pixel definition layer 280, thereby facilitating the contact area between the film layers and improving the adhesion between the film layers.

[0089] Furthermore, part of the pixel definition layer 280 contacts the isolation structure 210 at the edge of the first planarization layer 270 away from the first opening 271. Since the pixel definition layer 280 is usually made of organic materials, and the isolation structure 210 is usually made of metal materials, due to the different material properties, the film adhesion between the isolation structure 210 and the pixel definition layer 280 is stronger. This arrangement is conducive to the pixel definition layer 280 and the isolation structure 210 forming a wrapping structure, wrapping the first planarization layer 270 inside, which is conducive to avoiding the problem of film separation.

[0090] Continue to see Figure 4In one embodiment, optionally, there is a second set interval d2 between the edge of the pixel definition layer 280 away from the pixel opening 281 and the edge of the isolation structure 210 away from the first isolation opening 211. The light-emitting functional layer 250 contacts the isolation structure 210 at the second set interval d2. The second set interval d2 is smaller than the first set interval d1. Since the light-emitting functional layer 250 is generally made of organic materials, and the isolation structure 210 is generally made of metal materials, due to the different material properties, the film adhesion between the isolation structure 210 and the light-emitting functional layer 250 is stronger. Therefore, the embodiment of the present invention can improve the adhesion effect and help avoid the problem of film separation.

[0091] Continue to see Figure 4 In one embodiment, optionally, the display panel further includes a second planarization layer 290, which is disposed between the isolation structure 210 and the substrate 230; the second planarization layer 290 includes a second opening 291, and the orthographic projection of the second opening 291 on the substrate 230 overlaps with the orthographic projection of the first isolation opening 211 on the substrate 230. The provision of the second opening 291 enables the first electrode 221 to be reliably electrically connected to the substrate 230. Optionally, the orthographic projection of the second opening 291 on the substrate 230 covers and is larger than the orthographic projection of the first opening 271 on the substrate 230.

[0092] It should be noted that the embodiment of the present invention does not limit the size of the second opening 291, as long as the area of ​​the second opening 291 can meet the requirements of reliable electrical connection between the first electrode 221 and the substrate 230. In addition, the second planarization layer 290 can play a role in film planarization, so that the isolation structure 210 is flat as a whole, which is conducive to improving the accuracy of film evaporation when the isolation structure 210 is used as a mask.

[0093] Continue to see Figure 4 In one embodiment, optionally, the light-emitting functional layer 250 at least covers the surface of the first electrode layer 240 away from the substrate 230. That is, the light-emitting functional layer 250 extends from the first opening 271 at least to the side of the isolation structure 210 away from the substrate 230 along the surface of the first electrode layer 240 away from the substrate 230. This arrangement is conducive to ensuring that the area of ​​the light-emitting functional layer 250 covers the entire light-emitting device 220, thereby ensuring the light-emitting effect of the light-emitting device 220.

[0094] Continue to see Figure 4In one embodiment, optionally, the orthographic projection of the light-emitting functional layer 250 on the substrate 230 covers the orthographic projection of the first electrode layer 240 on the substrate 230, and covers the orthographic projection of the isolation structure 210 on the substrate 230. The light-emitting functional layer 250 covers the orthographic projection of the isolation structure 210 on the substrate 230, so that the light-emitting functional layer 250 contacts the isolation structure 210 at the second interval d2. Since the light-emitting functional layer 250 is generally made of organic materials, and the isolation structure 210 is generally made of metal materials, due to the different material properties, the film adhesion between the isolation structure 210 and the light-emitting functional layer 250 is stronger. Therefore, the embodiment of the present invention can improve the adhesion effect and help avoid the problem of film separation.

[0095] Continue to see Figure 4 In one embodiment, further, the light-emitting functional layer 250 is disconnected at a side of the isolation structure 210 away from the substrate 230 and at a connection with the second isolation opening 212 .

[0096] Specifically, the coverage of the light-emitting functional layer 250 includes at least the inside of the pixel opening 281 and the side of the isolation structure 210 away from the substrate 230. The embodiment of the present invention is configured in this way, so that the isolation structure 210 can be used as a mask. When the light-emitting functional layer 250 is evaporated, the light-emitting functional layer 250 is disconnected by the structure of the isolation structure 210 and the second isolation opening 212, and there is no crosstalk between adjacent light-emitting devices 220, thereby simplifying the preparation process while ensuring the display effect of the display panel.

[0097] Continue to see Figure 4 In one embodiment, optionally, in the second isolation opening 211, a partial area of ​​the light-emitting functional layer 250 is arranged on a side surface of the second planarization layer 290 away from the substrate. That is, the orthographic projection of the light-emitting functional layer 250 on the substrate 230 also overlaps with the orthographic projection of the second isolation opening 212 on the substrate 230. When the light-emitting functional layer 250 is evaporated, the light-emitting functional layer 250 can be disconnected by the structure of the isolation structure 210 and the second isolation opening 212. Due to the characteristics of the evaporation process, the evaporated light-emitting material will fall into the second isolation opening 212 to form a light-emitting functional layer 250 located in the second isolation opening 211. This part of the light-emitting functional layer 250 will not emit light, and thus will not affect the normal display of the display panel.

[0098] It should be noted that the light-emitting area of ​​the light-emitting device 220 is determined by the overlapping area between the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260. Even if the area of ​​the light-emitting functional layer 250 is larger than the area of ​​the first electrode layer 240, it will not cause the problem of color crosstalk caused by the excessive light-emitting area.

[0099] It should also be noted that in practical applications, the area of ​​the light-emitting functional layer 250 can be adjusted according to specific needs. In other embodiments, Figure 5 As shown, the light-emitting functional layer 250 is disconnected at a location of the isolation structure 210 away from the first isolation opening 211 , and does not extend into the second isolation opening 212 .

[0100] On the basis of the above embodiments, optionally, the first electrode layer 240 includes a plurality of first electrodes 221, the light emitting function layer 250 includes a plurality of light emitting function parts 222, and the second electrode 223 layer 260 includes a plurality of second electrodes 223; the first electrodes 221, the light emitting function parts 222, and the second electrodes 223 constitute a light emitting device 220. The display panel includes a plurality of light emitting devices 220.

[0101] Figure 6 A schematic structural diagram of another display panel provided by an embodiment of the present invention. Figure 6 200 are exemplarily shown, namely, a first light emitting device 2201 and a second light emitting device 2202. The first light emitting device 2201 and the second light emitting device 2202 correspond to different first isolation openings 211. The first light emitting device 2201 and the second light emitting device 2202 may be light emitting devices with the same light emitting color.

[0102] Continue to see Figure 6 In one embodiment, optionally, the second electrode layer 260 covers the light-emitting functional layer 250 and at least partially covers the sidewall of the isolation structure 210 close to the second isolation opening 212. The sidewall of the isolation structure close to the second isolation opening 212, that is, the sidewall of the isolation structure 210 away from the first isolation opening 211, is specifically the sidewall 2111.

[0103] That is, the second electrode layer 260 extends from the first isolation opening 211 to the side of the isolation structure 210 away from the substrate 230, and extends to the sidewall 2111 and bottom 2121 of the second isolation opening 212. This arrangement ensures that the second electrode 223 can fully contact the isolation structure 210 for electrical connection.

[0104] Continue to see Figure 6 In one embodiment, optionally, the second electrode layer 260 covers the entire display panel. Exemplarily, the second electrode 223 of the first light-emitting device 2201 and the second electrode 223 of the second light-emitting device 2202 are arranged in the same layer and are electrically connected at the bottom of the second isolation opening 212. This arrangement enables the second electrode layer 260 to be shared between the light-emitting devices 220, that is, the second electrode layer 260 is a common electrode.

[0105] Figure 7A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Figure 7 In another embodiment, optionally, the second electrodes 223 of two adjacent light-emitting devices 220 are disconnected in the second isolation opening 212 to form an insulating opening 261 to perform electrical insulation between different light-emitting devices 220. Exemplarily, the light-emitting device 220 includes a first light-emitting device 2201 and a second light-emitting device 2202 having different luminous colors, and the second electrode 223 of the first light-emitting device 2201 and the second electrode 223 of the second light-emitting device 2202 are electrically insulated at the insulating opening 261. Specifically, the second electrode 223 of the first light-emitting device 2201 and the second electrode 223 of the second light-emitting device 2202 are disconnected at the bottom 2121 of the second isolation opening 212. Different from the aforementioned embodiment, such a configuration is conducive to the second electrodes 223 of the first light-emitting device 2201 and the second light-emitting device 2202 transmitting voltage signals of different voltage values, so that each voltage signal can be adjusted as needed.

[0106] It should be noted that in the above embodiments, it can be considered that one light emitting device 220 corresponds to one first isolation opening 211 and two second isolation openings 212; the opening between two adjacent light emitting devices 220 is the opening formed by splicing two second isolation openings 212. It can also be considered that the first isolation openings 211 and the second isolation openings 212 are alternately arranged, and the light emitting device 220 is arranged in the first isolation opening 211.

[0107] Figure 8 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Figure 8 On the basis of the above embodiments, optionally, the isolation structure 210 includes a first isolation portion 2101, a second isolation portion 2102 and a third isolation portion 2103 which are stacked in a direction away from the substrate 230, wherein the area of ​​the third isolation portion 2103 is larger than that of the first isolation portion 2101 and the second isolation portion 2102, and the area of ​​the first isolation portion 2101 is larger than that of the second isolation portion 2102.

[0108] That is, the orthographic projection of the second isolation part 2102 on the substrate 230 is set within the orthographic projection of the third isolation part 2103 on the substrate 230. In this way, the cross-sectional shape of the isolation structure 210 is an I-shaped structure, and the area of ​​the third isolation part 2103 far away from the substrate 230 is the largest, the area of ​​the first isolation part 2101 close to the substrate 230 is in the middle, and the area of ​​the second isolation part 2102 located in the middle is the smallest, which is conducive to cutting off the light-emitting functional layer 250 of the adjacent light-emitting device 220 at the position of the isolation structure 210 when evaporating the light-emitting functional layer 250. And the second electrode 223 can also be formed by the evaporation process. By controlling the different evaporation angles when evaporating the second electrode 223 and the light-emitting functional layer 250, the second electrode 223 overlaps the side wall of the first isolation part 2101, and then the second electrodes 223 of each light-emitting device 500 in the display panel can be connected to each other through the isolation structure 210.

[0109] Optionally, the material of the first isolation part 2101 includes molybdenum metal; and / or the material of the second isolation part 2102 includes aluminum metal; and / or the material of the third isolation part 2103 includes titanium metal. This arrangement is conducive to reducing the square resistance of the isolation structure 210 while ensuring the stability of the film layer, thereby improving the uniformity of display.

[0110] Fig. 9 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Fig. 9 On the basis of the above embodiments, the display panel may further include an encapsulation layer 2A0. The encapsulation layer 2A0 is used to encapsulate the light-emitting device 220, so that the light-emitting device 220 is protected from water vapor, which is beneficial to improving the stability of the light-emitting functional layer. Optionally, the encapsulation layer 2A0 completely covers the second electrode 223.

[0111] In the above embodiments, optionally, the first electrode 221 is an anode and the second electrode 223 is a cathode; or, the first electrode 221 is a cathode and the second electrode 223 is an anode.

[0112] The embodiment of the present invention further provides a display device, which may be a mobile phone, a computer, a tablet computer, a computer monitor, a wearable device, etc. The display device includes the display panel provided by any embodiment of the present invention and has corresponding beneficial effects, which will not be described in detail.

[0113] An embodiment of the present invention further provides a method for preparing a display panel, and the method can be used to prepare the display panel provided by any embodiment of the present invention. Fig.10 A schematic diagram of a method for manufacturing a display panel provided by an embodiment of the present invention. Fig.10 , the preparation method comprises the following steps:

[0114] S110, providing a substrate;

[0115] S120, forming an isolation structure on the substrate, wherein the isolation structure encloses a first isolation opening, and the first isolation opening exposes the substrate;

[0116] S130, forming a first electrode layer, wherein the first electrode layer extends from the first isolation opening to a side of the isolation structure away from the substrate; the first electrode layer is connected to the substrate through the first isolation opening;

[0117] S140, forming a light-emitting functional layer and a second electrode layer on a side of the first electrode layer away from the substrate, wherein the light-emitting functional layer and the second electrode layer extend from the first isolation opening to a side of the isolation structure away from the substrate.

[0118] In the embodiment of the present invention, when forming the first electrode layer, the light-emitting functional layer and the second electrode layer, the first electrode layer, the light-emitting functional layer and the second electrode layer are extended from the first isolation opening to the side of the isolation structure away from the substrate. Compared with the prior art, the setting position of the isolation structure and the film layers related to the light-emitting device (including the first electrode layer, the light-emitting functional layer and the second electrode layer) is adjusted. In this way, the setting of the isolation structure does not occupy the light-emitting area of ​​the light-emitting device, that is, the light-emitting area of ​​the light-emitting device is not limited by the opening area of ​​the isolation structure, thereby significantly increasing the light-emitting area of ​​the light-emitting device and improving the display effect.

[0119] On the basis of the above embodiments, optionally, a second isolation opening is formed while forming the first isolation opening; and the second electrode layer is connected to a side wall of the isolation structure close to the second isolation opening.

[0120] The embodiment of the present invention is beneficial to increasing the light-emitting area of ​​the light-emitting device. In the process of evaporation, the evaporation angles of the light-emitting functional layer and the second electrode layer are inclined in opposite directions. Even if there are process fluctuations, the evaporation of the light-emitting functional layer will not affect the overlap between the second electrode layer and the isolation structure. Therefore, the embodiment of the present invention improves the problem of abnormal display of the light-emitting device, reduces the requirements of the preparation process on the organic evaporation angle, and improves the yield.

[0121] Based on the above embodiments, optionally, before forming the isolation structure, a second planarization layer is formed on the substrate. The second planarization layer can play a role in film flattening, so that the isolation structure is flat as a whole. In subsequent steps, when the isolation structure is used as a mask plate, it is helpful to improve the accuracy of film evaporation.

[0122] On the basis of the above embodiments, optionally, after forming the isolation structure and before forming the first electrode layer, a step of forming a first planarization layer is further included. The first planarization layer can cover the side of the isolation structure away from the substrate and the sidewall of the first isolation opening, thereby playing a planarization role, which is beneficial to the preparation of the first electrode layer and the first electrode layer is more flat, thereby facilitating the display effect.

[0123] On the basis of the above embodiments, optionally, after forming the first electrode layer and before forming the light-emitting functional layer, a step of forming a pixel definition layer on the side of the isolation structure away from the substrate is further included. The pixel definition layer is arranged on the side of the isolation structure away from the substrate, so that the area of ​​the pixel opening is larger than the area of ​​the first isolation opening, which is conducive to increasing the light-emitting area. In addition, the arrangement of the pixel definition layer is conducive to accurately controlling the size of the light-emitting area of ​​the light-emitting device, and the area of ​​the pixel opening is the light-emitting area of ​​the light-emitting area, thereby improving the uniformity of the display.

[0124] Based on the above embodiments, optionally, after forming the second electrode, a step of forming an encapsulation layer is further included. The encapsulation layer is used to encapsulate the light-emitting device, so that the light-emitting device is protected from water vapor, which is beneficial to improving the stability of the light-emitting functional layer. Optionally, the encapsulation layer completely covers the second electrode.

[0125] On the basis of the above embodiments, optionally, since there are light-emitting functional layers of different light-emitting colors in the display panel, and since the materials of the light-emitting functional layers of different light-emitting colors are different, it is necessary to perform in steps. Taking three light-emitting colors as an example, after forming the first electrode layer, the steps include forming a first light-emitting device, forming a second light-emitting device, and forming a third light-emitting device.

[0126] Figure 11-Figure 19 A schematic diagram of the structure of a method for manufacturing a display panel in each step provided by an embodiment of the present invention. Figure 11-Figure 19 Based on the above embodiments, optionally, taking the step of forming a first light-emitting device as an example, the method for preparing the display panel includes the following steps:

[0127] S210 , forming a substrate 230 .

[0128] See also Fig.11 , wherein an array layer is disposed on the substrate 230, and the array layer may be, for example, a film layer provided with devices such as transistors or capacitors, and the transistors and capacitors constitute a pixel circuit, and the pixel circuit is used to provide a driving signal required for the light-emitting device to emit light. In order for the driving signal to be smoothly transmitted to the light-emitting device, the output terminal connection line (for example, the anode line) of the pixel circuit is usually disposed on the uppermost layer of the substrate 230.

[0129] S220 , forming a second planarization layer 290 on the substrate 230 .

[0130] See also Fig.12 For example, the material of the second planarization layer 290 is an insulating material such as an organic material and / or an inorganic material. In practical applications, the thickness of the second planarization layer 290 can be set thicker or thinner as needed. The second planarization layer 290 can be a single-layer film layer, a two-layer film layer, or a multi-layer film layer. The second planarization layer 290 can play a role in film flattening, thereby ensuring the overall flatness of the isolation structure 210 in subsequent processes. When the isolation structure 210 is used as a mask plate, it is beneficial to improve the accuracy of film evaporation.

[0131] Exemplarily, the material of the second planarization layer 290 is an organic glue, which is coated on the substrate 230 by a whole-layer coating process, and a second opening 291 is formed by a patterning process. The second opening 291 exposes the output terminal connection line (e.g., anode line) of the pixel circuit, so that the first electrode 221 can be reliably electrically connected to the substrate 230 in the subsequent process. It should be noted that the embodiment of the present invention does not limit the size of the second opening 291, as long as the area of ​​the second opening 291 can meet the requirement that the first electrode 221 can be reliably electrically connected to the substrate 230. Exemplarily, the area of ​​the second opening 291 is 5um, 8um, 10um, 12um or 15um, etc.

[0132] S230 , forming an isolation structure 210 on the second planarization layer 290 .

[0133] See also Fig.13 , wherein the isolation structure 210 is a structure with a certain thickness, and optionally, the isolation structure 210 is a double-layer structure, a three-layer structure or a multi-layer structure. Exemplarily, the isolation structure 210 includes a first isolation portion 2101, a second isolation portion 2102 and a third isolation portion 2103 which are stacked in sequence. The material of the first isolation portion 2101 includes molybdenum metal; and / or the material of the second isolation portion 2102 includes aluminum metal; and / or the material of the third isolation portion 2103 includes titanium metal, so as to reduce the sheet resistance of the isolation structure 210.

[0134] Exemplarily, a film layer structure of a first isolation portion of the entire layer is first formed by a process such as physical vapor deposition or chemical vapor deposition, and then a third opening and a fourth opening are formed by a patterning process, wherein the orthographic projection of the third opening on the substrate 230 overlaps with the orthographic projection of the second opening 291 on the substrate 230, the third opening is larger than the second opening 291, and the third opening completely exposes the second opening 291, and the area of ​​the fourth opening may be the same as that of the third opening; then a film layer structure of a second isolation portion of the entire layer is formed by a process such as physical vapor deposition or chemical vapor deposition, and then a fifth opening and a sixth opening are formed by a patterning process, wherein the orthographic projection of the fifth opening on the substrate 230 overlaps with the orthographic projection of the second opening 291 on the substrate 230, and the area of ​​the fifth opening is larger than the second opening 291. The third opening is formed, and the fifth opening completely exposes the third opening. The area of ​​the sixth opening can be the same as the fifth opening, so that the area of ​​the first isolation part 2101 is larger than the second isolation part 2102; then, a process such as physical vapor deposition or chemical vapor deposition is used to form a film layer structure of the entire third isolation part, and then a patterning process is used to form the seventh opening and the eighth opening. The orthographic projection of the seventh opening on the substrate 230 overlaps with the orthographic projection of the second opening 291 on the substrate 230. The area of ​​the seventh opening is between the second opening 291 and the third opening, and the third opening completely exposes the second opening 291. The area of ​​the eighth opening can be the same as the seventh opening, so that the area of ​​the third isolation part 2103 is larger than the first isolation part 2101 and the second isolation part 2102. Exemplarily, the areas of the seventh opening and the eighth opening are 8um, 10um, 15um, 18um or 20um, etc. Among them, the third opening, the fifth opening and the seventh opening constitute the first isolation opening 211, and the fourth opening, the sixth opening and the eighth opening constitute the second isolation opening 212.

[0135] Such arrangement, on the one hand, is advantageous in that the light-emitting functional layer 250 of the adjacent light-emitting device 220 can be cut off at the position of the isolation structure 210 when the light-emitting functional layer 250 is evaporated; on the other hand, the second electrode 223 can also be formed by the evaporation process, and by controlling the different evaporation angles when evaporating the second electrode 223 and the light-emitting functional layer 250, the second electrode 223 can overlap with the side wall of the first isolation portion 2101, thereby achieving that the second electrodes 223 of each light-emitting device 500 in the display panel are interconnected through the isolation structure 210.

[0136] S240 , forming a first planarization layer 270 on the sidewalls of the second opening 291 , the sidewalls of the isolation structure 210 close to the first isolation opening 211 , and a side of the isolation structure 210 away from the substrate 230 .

[0137] See also Fig.14, exemplarily, the material of the first planarization layer 270 is an insulating material such as an organic material and / or an inorganic material. In practical applications, the thickness of the first planarization layer 270 can be set thicker or thinner as needed. The first planarization layer 270 can be a single-layer film layer, a two-layer film layer, or a multi-layer film layer. The first planarization layer 270 can cover the partial area of ​​the isolation structure 210 away from the substrate 230, cover the side wall of the isolation structure 210 close to the first isolation opening 211, and cover the side wall of the second opening 291, so as to play a planarization role, which is beneficial to the preparation of the first electrode layer 240 in the subsequent preparation process and the first electrode layer 240 is more flat, which is beneficial to the display effect.

[0138] Exemplarily, the material of the first planarization layer 270 is an organic glue, and the organic glue is coated in the first isolation opening 211, on the isolation structure 210, and in the second isolation opening 212 by a whole-layer coating process; then, a first opening 271 and a ninth opening are formed on the first planarization layer 270 by a patterning process. The orthographic projection of the first opening 271 on the substrate 230 overlaps with the orthographic projection of the first isolation opening 211 on the substrate 230, so that the first opening 271 exposes the substrate 230. Exemplarily, the area of ​​the first opening 271 can be the same as the area of ​​the second opening 291; the area of ​​the first opening 271 can also be slightly smaller than the area of ​​the second opening 291. The area of ​​the ninth opening is larger than the area of ​​the second isolation opening 212, so that the structure of the first planarization layer 270 is a structure extending from the sidewall of the first isolation opening 211 to the side of the isolation structure 210 away from the substrate 230.

[0139] S250 , forming a first electrode layer 240 on the first planarization layer 270 .

[0140] See also Fig.15 Exemplarily, the first electrode layer 240 is an anode, and its material is a transparent conductive material such as indium tin oxide (ITO), silver nanowires (AgNWs), carbon nanotubes (CNTs) and graphene.

[0141] Exemplarily, the material of the first electrode layer 240 is indium tin oxide (ITO), and a whole layer of uniform indium tin oxide ITO film is deposited on the first planarization layer 270 by physical vapor deposition (PVD) or chemical vapor deposition (CVD) and other processes; then a patterning process is performed to etch away the portion other than the first electrode 221. Optionally, the first electrode 221 extends from the first isolation opening 211 to the top of the isolation structure 210, and there is a first set interval between the edge of the first electrode 221 away from the first opening 271 and the second isolation opening 212. The portion of the first electrode 221 disposed on the side wall of the first isolation opening 211 and the top of the isolation structure 210 can expand the light-emitting area of ​​the light-emitting device, and the setting of the first set interval is conducive to avoiding crosstalk between light-emitting devices of different colors.

[0142] S260 , forming a pixel definition layer 280 on the first electrode layer 240 .

[0143] See also Fig.16 , exemplarily, the material of the pixel definition layer 280 is an insulating material such as an organic material and / or an inorganic material. First, a process such as spin coating, spray coating, printing, chemical vapor deposition or physical vapor deposition is used to coat or deposit the pixel definition layer material on the first electrode layer 240; then a graphic process is used to remove the pixel definition layer 280 outside the top of the isolation structure 210, and a pixel opening is formed, and the area of ​​the pixel opening is larger than the area of ​​the first isolation opening 211. Among them, the pixel definition layer 280 is arranged on the side of the isolation structure 210 away from the substrate 230, so that the area of ​​the pixel opening is larger than the area of ​​the first isolation opening 211, which is conducive to increasing the light-emitting area. In addition, the setting of the pixel definition layer 280 is conducive to accurately controlling the size of the light-emitting area of ​​the light-emitting device 220. The area of ​​the pixel opening is the light-emitting area of ​​the light-emitting area, thereby improving the uniformity of the display.

[0144] Optionally, there is a second set interval between the pixel definition layer 280 and the second isolation opening 212 away from the edge of the pixel opening, so that in the subsequent process, the light-emitting functional layer contacts the isolation structure 210 at the second set interval, which is beneficial to improve the adhesion effect and thus help avoid the film layer separation problem.

[0145] S270 , forming a light-emitting function layer 250 in the pixel opening of the pixel definition layer 280 and on the pixel definition layer 280 .

[0146] See also Fig.17, wherein the material of the light-emitting functional layer 250 is an organic light-emitting material. Exemplarily, the isolation structure 210 is used as a mask plate, and an evaporation process is used to form a whole layer of the light-emitting functional layer 250 in the pixel opening of the pixel definition layer 280 and on the pixel definition layer 280. The light-emitting functional layer 250 can be controlled to be disconnected at the second isolation opening 212 by adjusting the evaporation angle. Specifically, with the first isolation opening 211 as the center, the evaporation angle spreads to both sides. Since the top of the isolation structure 210 blocks the formation of an evaporation shadow in the second isolation opening 212, the light-emitting functional layer 250 is disconnected at the second isolation opening 212, and the light-emitting functional part 222 is in contact with the first electrode 221.

[0147] S280 , forming a second electrode layer 260 on the light-emitting functional layer 250 .

[0148] See also Fig.18 , exemplarily, the second electrode layer 260 is a cathode, and its material is aluminum (Al), silver (Ag), gold (Au) and copper alloy. Exemplarily, the isolation structure 210 is used as a mask plate, and an evaporation process is used to form a whole layer of the second electrode layer 260 on the light-emitting functional layer 250. Different from the formation of the light-emitting functional layer 250, the evaporation angle of the second electrode layer 260 should be able to enable the second electrode layer to be deposited on the side wall of the second isolation opening 212, so that the second electrode layer 260 and the isolation structure 210 are reliably electrically connected.

[0149] S290 , forming a packaging layer 2A0 on the second electrode layer 260 .

[0150] See also Fig.19 Exemplarily, the encapsulation layer 2A0 may be a single-layer film layer, a two-layer film layer or a multi-layer film layer, and its materials include inorganic materials, organic materials and composite materials, etc. A thin film encapsulation (TFE) process may be used to stack multiple layers of thin films to form the encapsulation layer 2A0.

[0151] In summary, the embodiment of the present invention extends the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260 from the first isolation opening 211 to the side of the isolation structure 210 away from the substrate 230 when forming the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260. Compared with the prior art, the setting positions of the isolation structure 210 and the film layers related to the light-emitting device 220 (including the first electrode layer 240, the light-emitting functional layer 250 and the second electrode layer 260) are adjusted. In this way, during the evaporation process of the light-emitting functional layer 250, the evaporation angles of the light-emitting functional layer 250 and the second electrode layer 260 are tilted in opposite directions. Even if there are process fluctuations, the overlap between the second electrode layer 260 and the isolation structure 210 will not be affected. Therefore, the embodiment of the present invention improves the problem of abnormal single-pixel display, reduces the requirements of the preparation process on the organic evaporation angle, and improves the yield. Furthermore, the embodiment of the present invention changes the light-emitting area from inside the isolation structure 210 to inside the isolation structure 210 and on a side away from the substrate 230, so that the setting of the isolation structure 210 does not occupy the position of the light-emitting area, thereby significantly increasing the light-emitting area and improving the display effect.

[0152] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0153] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; A first electrode layer, a light-emitting functional layer, and a second electrode layer are sequentially stacked in a direction away from the substrate; An isolation structure, the isolation structure is disposed between the substrate and the first electrode layer; the isolation structure encloses a first isolation opening; The first electrode layer, the light-emitting functional layer and the second electrode layer extend from the first isolation opening at least to a side of the isolation structure away from the substrate.

2. The display panel according to claim 1, characterized in that: Also includes: A first planarization layer, wherein the first planarization layer is at least disposed on a side of the isolation structure close to the first isolation opening, and the first planarization layer is provided with a first opening, and the first opening is disposed in the first isolation opening; The first electrode layer is connected to the substrate through the first opening; Preferably, the orthographic projection of the first electrode layer on the substrate is located within the orthographic projection of the first planarization layer on the substrate.

3. The display panel according to claim 2, characterized in that: The first planarization layer at least covers the sidewalls of the first isolation opening; Preferably, the first planarization layer covers the sidewalls of the first isolation opening, and covers a portion of the isolation structure on a side away from the substrate; Preferably, the first electrode layer covers the sidewalls of the first opening, and covers a portion of the first planarization layer disposed on a side of the isolation structure away from the substrate; Preferably, there is a first set interval between an edge of the first planarization layer away from the first opening and an edge of the isolation structure away from the first isolation opening.

4. The display panel according to claim 2, characterized in that: Also includes: A pixel definition layer is provided on a side of the isolation structure away from the substrate, and the pixel definition layer is at least partially provided between the light-emitting functional layer and the first electrode layer, and the pixel definition layer is provided with a pixel opening, and the orthographic projection of the pixel opening on the substrate covers and is larger than the orthographic projection of the first isolation opening on the substrate; Preferably, the pixel definition layer covers an edge of the first electrode layer disposed on a side of the isolation structure away from the substrate and away from the first opening, and covers an edge of the first planarization layer disposed on a side of the isolation structure away from the substrate and away from the first opening; Preferably, part of the pixel definition layer is disposed between the light-emitting functional layer and the isolation structure; Preferably, there is a second set interval between an edge of the pixel definition layer away from the pixel opening and an edge of the isolation structure away from the first isolation opening.

5. The display panel according to claim 2, characterized in that: Also includes: a second planarization layer, the second planarization layer being disposed between the isolation structure and the substrate; the second planarization layer comprising a second opening, an orthographic projection of the second opening on the substrate overlapping an orthographic projection of the first isolation opening on the substrate; Preferably, the orthographic projection of the second opening on the substrate covers and is larger than the orthographic projection of the first opening on the substrate.

6. The display panel according to claim 1, characterized in that: Also includes: A second isolation opening, wherein in a direction perpendicular to the thickness of the display panel, the second isolation opening, the isolation structure and the first isolation opening are alternately arranged in sequence; The second electrode layer is connected to the isolation structure through the second isolation opening.

7. The display panel according to claim 6, characterized in that: The light-emitting functional layer at least covers the surface of the first electrode layer away from the substrate; Preferably, the orthographic projection of the light-emitting functional layer on the substrate covers the orthographic projection of the first electrode layer on the substrate, and covers the orthographic projection of the isolation structure on the substrate; Preferably, the light-emitting functional layer is disconnected at a side of the isolation structure away from the substrate and at a connection with the second isolation opening; Preferably, the display panel also includes a second planarization layer, which is arranged between the isolation structure and the substrate, and the orthographic projection of the second planarization layer on the substrate overlaps with the second isolation opening; within the second isolation opening, a partial area of ​​the light-emitting functional layer is arranged on a side surface of the second planarization layer away from the substrate.

8. The display panel according to claim 6, characterized in that: The second electrode layer covers the light-emitting functional layer, and at least partially covers the side wall of the isolation structure close to the second isolation opening; Preferably, the second electrode layer covers the entire display panel; Alternatively, the first electrode layer includes a first electrode, the light-emitting functional layer includes a light-emitting portion, and the second electrode layer includes a second electrode; the first electrode, the light-emitting portion and the second electrode constitute a light-emitting device; the display panel includes a plurality of light-emitting devices, and the second electrodes of two adjacent light-emitting devices are disconnected within the second isolation opening to form an insulating opening.

9. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 8.

10. A method for preparing a display panel, characterized in that: include: providing a substrate; forming an isolation structure on the substrate, wherein the isolation structure encloses a first isolation opening, and the first isolation opening exposes the substrate; forming a first electrode layer, wherein the first electrode layer extends from the first isolation opening to a side of the isolation structure away from the substrate; the first electrode layer is connected to the substrate through the first isolation opening; A light-emitting functional layer and a second electrode layer are formed on a side of the first electrode layer away from the substrate. The light-emitting functional layer and the second electrode layer extend from the first isolation opening to a side of the isolation structure away from the substrate.

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