Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel and a preparation method thereof, and a display device, and solves the problem of poor processing performance of an OLED product in the prior art. The display panel includes: a first electrode; the isolation structure surrounds the first electrode; the isolation structure comprises an opening which exposes the first electrode; the light-emitting layer is located in the opening and overlaps the first electrode; the light-emitting layer comprises a first edge and a second edge except the first edge which are oppositely arranged, a gap is formed between the second edge and the isolation structure, and the distance between the first edge and the isolation structure is smaller than that between the second edge and the isolation structure; and the second electrode is located in the opening and overlaid on the side, away from the first electrode, of the light-emitting layer, the gap is filled with the second electrode, and the second electrode is electrically connected with the isolation structure.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) technology has gradually gained a foothold in the field of small-size displays due to its advantages such as lightness, flexibility, high contrast, and wide color gamut. However, some process performance of conventional OLED device products still needs to be improved. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a display panel and a method for manufacturing the same, and a display device to solve the problem of poor process performance of OLED products in the prior art.

[0004] In a first aspect, the present application provides a display panel, comprising: a substrate; a first electrode, arranged on the substrate; an isolation structure, surrounding the first electrode and spaced apart from the first electrode; the isolation structure comprises an opening formed by an enclosure, the opening exposing the first electrode; a light-emitting layer, located in the opening and overlapping with the first electrode; the light-emitting layer comprises a first edge and a second edge arranged opposite to each other, a gap being provided between the second edge and the isolation structure, a distance between the first edge and the isolation structure being smaller than a distance between the second edge and the isolation structure; and a second electrode, located in the opening, overlapping on a side of the light-emitting layer away from the first electrode, the second electrode filling the gap, and being electrically connected to the isolation structure.

[0005] In one embodiment, the second electrode includes a third edge and a fourth edge arranged opposite to each other, the third edge is located on the side where the first edge of the light-emitting layer is located, the fourth edge is located on the side where the second edge of the light-emitting layer is located, and the distance between the third edge and the isolation structure is greater than or equal to the distance between the fourth edge and the isolation structure.

[0006] In one embodiment, the first edge contacts the isolation structure; preferably, the display panel further comprises an encapsulation layer located on a side of the second electrode facing away from the substrate; preferably, the encapsulation layer also contacts a side wall of the isolation structure facing the opening.

[0007] In one embodiment, the orthographic projection of the third edge on the substrate is located on a side of the orthographic projection of the first edge on the substrate away from the orthographic projection of the isolation structure on the substrate, and there is a gap between the orthographic projection of the first edge on the substrate; or the second electrode covers the light-emitting layer, and the third edge is in contact with the isolation structure.

[0008] In one embodiment, the length of the third edge is less than the length of the fourth edge; preferably, the orthographic projection of the second electrode on the substrate includes any one of a trapezoid, a semicircle, and a rectangle.

[0009] In one embodiment, the isolation structure includes a supporting portion, the supporting portion includes a first surface close to the substrate, and a second surface away from the substrate, and the orthographic projection of the second surface on the substrate is located within the range of the orthographic projection of the first surface on the substrate; preferably, the supporting portion contains a conductive material; preferably, the supporting portion includes a first part and a second part stacked together, and the second part is located on the side of the first part away from the substrate; the side of the first part close to the light-emitting layer and the light-emitting direction form a first acute angle, and the side of the second part close to the light-emitting layer and the light-emitting direction form a second acute angle, and the second acute angle is smaller than the first acute angle; preferably, at least one of the first part and the second part includes a conductive material; preferably, the isolation structure also includes a partition layer stacked on the side of the second part away from the first part, and the second part includes a third surface in contact with the partition layer; the orthographic projection of the third surface on the substrate is located within the range of the orthographic projection of the partition layer on the substrate.

[0010] The second aspect of the present application provides a method for preparing a display panel, comprising: aligning a preset substrate and an evaporation crucible, the preset substrate comprising a substrate and a first electrode and an isolation structure arranged on the substrate, the isolation structure surrounding the first electrode and being spaced apart from the first electrode, the isolation structure enclosing to form an opening, the opening exposing the first electrode; adjusting the evaporation crucible to a first evaporation angle, preparing a light-emitting layer in the opening based on the first evaporation angle; adjusting the evaporation crucible to a second evaporation angle, preparing a second electrode on the light-emitting layer in the opening based on the second evaporation angle, the second evaporation angle being in opposite directions to the first evaporation angle.

[0011] In one embodiment, preparing a light-emitting layer in the opening based on the first evaporation angle includes: using vertical evaporation technology to evaporate the light-emitting material toward the opening based on the first evaporation angle to obtain the light-emitting layer.

[0012] In one embodiment, preparing the second electrode on the light-emitting layer in the opening based on the second evaporation angle includes: preparing the second electrode on the light-emitting layer in the opening based on the second evaporation angle using any one of vertical evaporation technology and point source evaporation technology.

[0013] A third aspect of the present application provides a display device, comprising the display panel provided by the first aspect or the second aspect.

[0014] The display panel, preparation method thereof, and display device provided in the present application increase the overlap area between the second electrode and the isolation structure and improve the reliability of the electrical connection between the two by setting a gap between the light-emitting layer and the isolation structure and filling the second electrode in the gap; in addition, the second electrode is filled in the gap, which also enhances the bonding force between the second electrode and the light-emitting layer, reduces the risk of the second electrode breaking, and further improves the yield rate of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1a A schematic cross-sectional view of a display panel provided in accordance with an embodiment of the present application.

[0016] Figure 1b for Figure 1a A partial top view of the display panel is provided.

[0017] Figure 1c A schematic cross-sectional view of a display panel provided in accordance with another embodiment of the present application.

[0018] Figure 2 A schematic cross-sectional view of a display panel provided in yet another embodiment of the present application.

[0019] Figure 3a This is a schematic diagram of an orthographic projection of a second electrode on a substrate provided in one embodiment of the present application.

[0020] Figure 3b A schematic diagram of an orthographic projection of a second electrode on a substrate provided in another embodiment of the present application.

[0021] Figure 4 A cross-sectional schematic diagram of an isolation structure provided in one embodiment of the present application.

[0022] Figure 5 A flow chart of a method for preparing a display panel provided in one embodiment of the present application.

[0023] Figure 6a-6c The stage structure of the display panel provided in one embodiment of the present application during the manufacturing process.

[0024] Figure 7 A staged structure in a manufacturing process of a display panel provided by another embodiment of the present application. DETAILED DESCRIPTION

[0025] In the related art, when preparing OLED devices, the entire surface is usually formed by evaporation, and then the substrate after the entire surface is etched by photolithography to form each pixel. However, in the process of preparing pixels using evaporation and photolithography, the cathode of the pixel and the metal wiring will have a poor overlap effect, or even no overlap, which will affect the product yield.

[0026] In view of this, the present application provides a display panel, including a substrate; a first electrode, arranged on the substrate; an isolation structure, surrounding the first electrode and spaced apart from the first electrode, the isolation structure encloses to form an opening, and the opening exposes the first electrode; a light-emitting layer, located in the opening, overlapping with the first electrode; the light-emitting layer includes a first edge and a second edge arranged opposite to each other, a gap is provided between the second edge and the isolation structure, and the distance between the first edge and the isolation structure is smaller than the distance between the second edge and the isolation structure; and a second electrode, located in the opening, overlapping on a side of the light-emitting layer away from the first electrode, the second electrode fills the gap, and is electrically connected to the isolation structure. Therefore, in the display panel provided according to the embodiment of the present application, by setting a gap between the second edge and the isolation structure and filling the second electrode in the gap, the overlap area between the second electrode and the isolation structure is increased, thereby improving the reliability of the electrical connection between the second electrode and the isolation structure in the embodiment of the present application.

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Figure 1a FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel provided in an embodiment of the present application. Figure 1a As shown, the display panel includes a substrate 100; a first electrode 110 disposed on one side of the substrate 100; an isolation structure 120 surrounding the first electrode 110 and spaced apart from the first electrode 110, the isolation structure 120 surrounding the first electrode 110 to form an opening 10, and the opening 10 exposes the first electrode 110. In the opening 10, a light-emitting layer 130 stacked with the first electrode 110 and a second electrode 140 stacked on the side of the light-emitting layer 130 away from the first electrode 110 are disposed. It should be noted that the orthographic projection of the isolation structure 120 on the substrate 100 can be in a grid shape, with each grid corresponding to the opening 10, and can also be as shown in FIG. Figure 1b As shown, the orthographic projections of the isolation structures 120 on the substrate 100 are in the form of independent rings, and each ring corresponds to an opening 10 .

[0029] Figure 1b for Figure 1a A partial top view of the display panel is provided. Figure 1b As shown, a plurality of openings 10 surrounded by isolation structures 120 are provided on the substrate 100, and each opening 10 is in a rectangular shape. Figure 1bThe first electrode 110 and the isolation structure 120 are arranged at intervals. In addition, each opening 10 includes Figure 1a The structure provided in the illustrated embodiment. It is understandable that the shape of the opening 10 can be set to other different shapes besides a rectangle, and the present application does not make any specific limitation on this.

[0030] The light-emitting layer 130 includes a first edge 131 and a second edge 132 that are arranged opposite to each other, and the second edge 132 may be all or part of the edge of the light-emitting layer 130 except the first edge 131. There is a gap 133 between the second edge 132 and the isolation structure 120, and the gap 133 exposes part of the isolation structure 120. The distance between the first edge 131 and the isolation structure 120 is smaller than the distance between the second edge 132 and the isolation structure 120. The distance between the first edge 131 and the isolation structure 120 may be zero, that is, the first edge 131 is in contact with the isolation structure 120. The second electrode 140 fills the gap 133 and is in contact with the isolation structure 120.

[0031] It should be noted that the light-emitting layer 130 includes a light-emitting material layer and may also include a plurality of light-emitting functional layers. The plurality of light-emitting functional layers may include a hole injection layer, a hole transport layer and an electron blocking layer sequentially stacked between the first electrode 110 and the light-emitting material layer, and a hole blocking layer, an electron transport layer and an electron injection layer sequentially stacked between the light-emitting material layer and the second electrode 140. It should be understood that the plurality of light-emitting functional layers may include all of the above-mentioned light-emitting functional layers or only a part thereof, and may be reasonably arranged according to actual needs.

[0032] The substrate 100 may be a thin film transistor array substrate or a base substrate.

[0033] The first electrode 110 is configured as an anode, and the second electrode 140 is configured as a cathode; alternatively, the first electrode 110 may be configured as a cathode, and the second electrode 140 may be configured as an anode, which is not specifically limited in the present application.

[0034] At least part of the isolation structure 120 is made of a conductive metal material. For example, the isolation structure 120 includes a plurality of stacked film layers, the plurality of film layers including a metal layer. The second electrode 140 contacts the isolation structure 120 to achieve an electrical connection between the second electrode 140 and the isolation structure 120.

[0035] In one embodiment, the display panel is further provided with a pixel definition layer 150, the pixel definition layer 150 and the first electrode 110 are located on one side surface of the substrate 100, and the pixel definition layer 150 is stacked with the isolation structure 120. The pixel definition layer 150 defines a pixel opening, and in the light emitting direction, the orthographic projection of the pixel opening falls within the orthographic projection range of the opening 10 surrounded by the isolation structure 120. The first electrode 110 and at least part of the light emitting layer 130 are located in the pixel opening. In other embodiments, the pixel definition layer 150 may cover the edge area of ​​the first electrode 110, and the pixel opening exposes the area of ​​the first electrode 110 that is not covered by the pixel definition layer 150. The side of the pixel definition layer 150 close to the light emitting layer 130 is at an acute angle to the light emitting direction, so that in the process of preparing the light emitting layer 130 and the second electrode 140, the climbing area is increased and the risk of fracture is reduced.

[0036] In another embodiment, the display panel does not have the pixel definition layer 150, and an insulating portion 160 is disposed around the first electrode 110. The insulating portion can be an inorganic material or an organic material. Therefore, the insulation between the first electrode 110 and the isolation structure 120 can be further improved.

[0037] Figure 1c FIG. 1 is a cross-sectional schematic diagram of a display panel provided by another embodiment of the present application. Figure 1c As shown, the display panel includes a substrate 100; a first electrode 110 disposed on one side of the substrate 100; an isolation structure 120 surrounding the first electrode 110 and spaced apart from the first electrode 110, the isolation structure 120 surrounding the first electrode 110 forms an opening, and the opening exposes the first electrode 110. In the opening, a light-emitting layer 130 stacked with the first electrode 110 and a second electrode 140 stacked on a side of the light-emitting layer 130 away from the first electrode 110 are disposed; and an insulating portion 160 is disposed in the gap between the first electrode 110 and the isolation structure 120.

[0038] In some other embodiments, the insulating portion may be stacked with the isolation structure 120 , and the insulating portion and the first electrode 110 may be spaced apart.

[0039] Through the above configuration, in the display panel provided in the embodiment of the present application, the second electrode 140 fills the gap 133 between the light-emitting layer 130 and the isolation structure 130, increases the overlap area between the second electrode 140 and the isolation structure 130, and improves the reliability of the electrical connection between the two. In addition, the second electrode 140 is filled in the gap 133, which also reduces the risk of the second electrode 140 breaking, further improving the yield rate of the display panel.

[0040] In one embodiment, Figure 1aAs shown, the second electrode 140 includes a third edge 141 and a fourth edge 142 that are arranged opposite to each other, and the fourth edge 142 may be all or part of the edges of the second electrode 140 except the third edge 141. The third edge 141 is located on the side where the first edge 131 of the light-emitting layer 130 is located; meanwhile, the fourth edge 142 is located on the side where the second edge 132 of the light-emitting layer 130 is located. The distance between the third edge 141 and the isolation structure 120 is greater than the distance between the fourth edge 142 and the isolation structure 120. Among them, the distance between the fourth edge 142 and the isolation structure 120 may be zero, that is, the fourth edge 142 is in contact with the isolation structure 120.

[0041] In this way, the second electrode 140 not only contacts the isolation structure 120 at the gap 133, but also contacts the isolation structure 120 above the gap 133 through the fourth edge 142. Therefore, the overlapping area between the second electrode 140 and the isolation structure 120 can be increased, and the reliability of the electrical connection between the second electrode 140 and the isolation structure 120 can be further improved.

[0042] In one embodiment, the display panel further includes an encapsulation layer, which is located on a side of the second electrode 140 away from the substrate 100 and covers the second electrode 140 to block water vapor, oxygen, etc. from invading the second electrode 140. Figure 1c The encapsulation layer 170 also contacts the side wall of the isolation structure 120 facing the opening to form an independent sub-pixel encapsulation to block water vapor, oxygen, etc. from invading the first electrode 110, the light-emitting layer 130 and the second electrode 140, thereby improving the service life of the display panel.

[0043] In one embodiment, Figure 1a As shown, the first edge 131 of the light-emitting layer 130 is in contact with the isolation structure 120. Exemplarily, the light-emitting layer 130 can be prepared by vertical evaporation technology. In this case, by controlling the evaporation angle of the evaporation source, the evaporation area of ​​the light-emitting material can be offset as much as possible to the side where the first edge 131 is located, so that the first edge 131 of the light-emitting layer 130 obtained by evaporation is in contact with the isolation structure 120, and at the same time, the gap between the second edge 132 of the light-emitting layer 130 and the isolation structure 120 is as large as possible. In addition, since the evaporation area is offset to the side where the first edge 131 is located, part of the light-emitting layer material may climb the side wall of the isolation structure 120 to be evaporated on the side wall of the isolation structure 120.

[0044] In one embodiment, Figure 1aAs shown, the orthographic projection of the third edge 141 of the second electrode 140 on the substrate 100 is located on the side of the orthographic projection of the first edge 131 on the substrate 100 away from the orthographic projection of the isolation structure 120 on the substrate 100, and there is a gap between the orthographic projection of the first edge 141 on the substrate 100. Exemplarily, the second electrode 140 can be prepared by vertical evaporation technology. In this case, by controlling the evaporation angle of the evaporation source, the evaporation area of ​​the second electrode material can be moved as far as possible to the side where the fourth edge is located, thereby ensuring that the third edge 141 of the second electrode 140 is located on the side of the first edge 131 away from the isolation structure 120, and there is a gap between the third edge 141 and the first edge 131.

[0045] At the same time, the second electrode 140 covers part of the light-emitting layer 130 and can fill the gap 133 between the second edge 132 and the isolation structure 120, so that the second electrode 140 overlaps the isolation structure 120 to establish an electrical connection between the second electrode 140 and the isolation structure 120. In addition, the vapor deposition area is offset in the direction of the fourth edge 142, so the second electrode material will be vapor-deposited on the side wall of the isolation structure 120, further increasing the overlap area between the second electrode 140 and the isolation structure 120.

[0046] In one embodiment, Figure 4 As shown, the isolation structure 120 includes a support portion 20, wherein the support portion 20 includes a conductive material. The support portion 20 includes a first surface close to the substrate 100, and a second surface away from the substrate 100, and the orthographic projection of the second surface on the substrate 100 is located within the range of the orthographic projection of the first surface on the substrate 100. Specifically, the orthographic projection of the second surface on the substrate 100 can completely overlap with the orthographic projection of the first surface on the substrate 100, and the cross-sectional view of the support portion 20 is a rectangle; the orthographic projection of the second surface on the substrate 100 can also be smaller than the orthographic projection of the first surface on the substrate 100, and the cross-sectional view of the support portion 20 is a regular trapezoid, which is not specifically limited. Continue to refer to Figure 1a When the cross-sectional view of the supporting portion is a right trapezoid, the portion of the isolation structure 120 close to the second electrode 140 is sloped, and the surface of the isolation structure 120 in contact with the fourth edge 142 forms an acute angle with the light emitting direction of the light emitting layer 130, so as to ensure that the orthographic projection of the second surface on the substrate 100 is within the range of the orthographic projection of the first surface on the substrate 100.

[0047] In this way, during the preparation process, the sloped isolation structure 120 makes it easier for the second electrode 140 to climb, thereby increasing the area covered by the second electrode 140 on the isolation structure 120 , thereby increasing the overlapping area between the second electrode 140 and the isolation structure 120 .

[0048] Figure 2FIG. 1 is a cross-sectional schematic diagram of a display panel provided in yet another embodiment of the present application. Figure 2 As shown, the display panel and Figure 1a The difference of the display panel shown is that, in the present embodiment, the second electrode 140 covers the light emitting layer 130 , and the third edge 141 is in contact with the isolation structure 120 .

[0049] For example, the second electrode 140 may be rotary evaporated using a point evaporation source. At this time, the second electrode 140 covers the entire surface of the light-emitting layer 130 away from the first electrode 110. Specifically, on the side of the third edge 141, the second electrode 140 covers the light-emitting layer 130 and overlaps the isolation structure 120, further increasing the overlap area between the second electrode 140 and the isolation structure 120.

[0050] Through the above configuration, the overlapping area between the second electrode 140 and the isolation structure 120 can be further increased, so as to improve the reliability of the electrical connection between the second electrode 140 and the isolation structure 120 .

[0051] Figure 3a This is a schematic diagram of an orthographic projection of a second electrode on a substrate 100 provided in one embodiment of the present application. Figure 3b This is a schematic diagram of an orthographic projection of a second electrode on a substrate 100 provided in another embodiment of the present application. Figure 3a and Figure 3b As shown, the length of the third edge 141 of the second electrode 140 is less than the length of the fourth edge 142 , and the fourth edge 142 refers to all edges of the second electrode 140 except the third edge 141 .

[0052] For example, Figure 3a As shown, the orthographic projection of the second electrode 140 on the substrate 100 is a trapezoid. At this time, the longer base of the trapezoid can be used as the third edge 141, and the shorter base and two sides of the trapezoid can be used as the fourth edge 142. According to the properties of the trapezoid, the length of the longer base is less than the sum of the lengths of the shorter base and the two sides, that is, the length of the third edge 141 is less than the length of the fourth edge 142.

[0053] For example, Figure 3b As shown, when the orthographic projection of the second electrode 140 on the substrate 100 is a semicircle, the straight edge of the semicircle can be used as the third edge 141, and the arc of the semicircle can be used as the fourth edge 142. Obviously, the length of the third edge 141 is less than that of the fourth edge 142.

[0054] It can be understood that the above are only some embodiments of the present application, and the orthographic projection of the second electrode 140 on the substrate 100 can also be rectangular, elliptical, etc. The present application does not specifically limit the shape of the second electrode 140.

[0055] Through the above arrangement, it can be ensured that the edge of the second electrode 140 in contact with the isolation structure 120 is longer than the edge of the second electrode 140 not in contact with the isolation structure 120, so as to ensure that the overlapping area between the second electrode 140 and the isolation structure 120 is as large as possible, thereby improving the reliability of the electrical connection.

[0056] Figure 4 Schematic diagram of a cross-section of an isolation structure provided in one embodiment of the present application. The isolation structure can be applied to the display panel provided in any of the above embodiments. Figure 4 As shown, the support portion 20 further includes a first portion 121 and a second portion 122 stacked together, and the second portion 122 is located on a side of the first portion 121 away from the substrate 100. At least one of the first portion 121 and the second portion 122 includes a conductive material. Therefore, the second electrode 140 can be electrically connected to only one of the first portion 121 or the second portion 122, or to both at the same time.

[0057] The side surface of the first portion 121 close to the light emitting layer 130 and the light emitting direction of the light emitting layer 130 form a first acute angle α; the side surface of the second portion 122 close to the light emitting layer 130 and the light emitting direction of the light emitting layer 130 form a second acute angle β; and the second acute angle β is smaller than the first acute angle α.

[0058] With the above settings, Figure 4 The embodiment shown in the figure forms a climbing path with a corner by providing two sections of the isolation structure 120 with different slopes. Compared with a straight climbing path, the climbing area of ​​the second electrode 140 is increased, thereby increasing the contact area between the isolation structure 120 and the second electrode 140. Figure 1a and Figure 2 In the illustrated embodiment, the overlapping area between the second electrode 140 and the isolation structure 120 is further increased.

[0059] Continue to refer Figure 4 In one embodiment, the isolation structure 120 further includes an isolation layer 123, which is stacked on a side of the second portion 122 away from the first portion 121. The second portion 122 includes a third surface 1221 in contact with the isolation layer 123; the orthographic projection of the third surface 1221 on the substrate 100 is within the range of the orthographic projection of the isolation layer 123 on the substrate 100.

[0060] Through the above arrangement, during the preparation process, the edge of the partition layer 123 can partition the evaporated film layer, thereby eliminating the need to use a fine metal mask plate, thereby simplifying the preparation process and improving the preparation efficiency.

[0061] In one embodiment, the first portion 121, the second portion 122 and the isolation layer 123 of the isolation structure 120 may be made of one or more metal materials. For example, the first portion 121 is molybdenum metal, the second portion 122 is aluminum metal, and the isolation layer 123 is titanium metal. The first portion 121 and the isolation layer 123 may also be organic material film layers.

[0062] The present application also provides a method for preparing a display panel. Figure 5 A flow chart of a method for preparing a display panel provided in one embodiment of the present application. Figure 6a-6c An embodiment of the present application provides a staged structure of a display panel during the manufacturing process. Figure 7 This is a staged structure in the manufacturing process of a display panel provided in another embodiment of the present application. The manufacturing method is used for the display panel provided in any of the above embodiments, and specifically includes:

[0063] S510, aligning the pre-set substrate and the evaporation crucible.

[0064] like Figure 6a As shown, the pre-deposited substrate 510 includes a substrate 100, a first electrode 110 is disposed on one side of the substrate 100, and an isolation structure 120 surrounding the first electrode 110 and spaced apart from the first electrode 110. The isolation structure 120 encloses an opening, which exposes the first electrode 110. The evaporation crucible 520 includes a plurality of nozzles 521, which are used to evaporate the organic material onto the pre-deposited substrate 510.

[0065] The position of the evaporation crucible 520 is adjusted so that it is aligned with the pre-placed substrate 510. Specifically, first, the position of the evaporation crucible 520 is adjusted so that the nozzle 521 faces the opening on the pre-placed substrate 510. Secondly, the position of the evaporation crucible 520 is further adjusted so that the pre-placed substrate 510 is located within the evaporation range of the evaporation crucible 520. At this point, the alignment between the pre-placed substrate 510 and the evaporation crucible 520 is achieved.

[0066] S520, adjusting the evaporation crucible to a first evaporation angle, and preparing a light-emitting layer in the opening based on the first evaporation angle.

[0067] like Figure 6b As shown, the evaporation crucible 520 can be adjusted to the first evaporation angle so that the evaporation direction is tilted along one side of the isolation structure and points to the isolation structure on the opposite side. At this time, the evaporation range of the evaporation crucible 520 can cover the opening range. Among them, the first evaporation angle can be set according to actual conditions.

[0068] In one embodiment, preparing the light emitting layer 130 in the opening based on the first evaporation angle includes: using vertical evaporation technology to evaporate the light emitting material toward the opening based on the first evaporation angle to obtain the light emitting layer 130 .

[0069] Specifically, when the light-emitting material is evaporated based on the first evaporation angle opening by the vertical evaporation technology, the evaporated material on the side close to the incident direction of the evaporated material is blocked by the isolation structure 120, so that the light-emitting layer 130 cannot be evaporated on the part of the first electrode close to the isolation structure 120 on this side. Therefore, there is a gap between the edge of one side of the light-emitting layer 130 prepared in this step and the isolation structure 120, and the distance between the other edges of the light-emitting layer 130 except the side edge and the isolation structure 120 is smaller than the distance between the side edge and the isolation structure 120.

[0070] S530, adjusting the evaporation crucible to a second evaporation angle, and preparing a second electrode on the light-emitting layer in the opening based on the second evaporation angle.

[0071] like Figure 6c As shown, the evaporation crucible 520 is further adjusted to the second evaporation angle so that the evaporation direction is tilted along one side of the isolation structure 120 and points to the isolation structure 120 on the opposite side, and the second evaporation angle of this step is opposite to the first evaporation angle in S420. At this time, the evaporation range of the evaporation crucible 520 can cover part or all of the light-emitting layer 130. Therefore, the second electrode 140 prepared in this step covers the side of the light-emitting layer 130 away from the first electrode, and the second electrode 140 fills the gap between the edge of one side of the light-emitting layer 130 and the isolation structure 120, and contacts the isolation structure 120. Among them, the second evaporation angle can be set according to actual conditions.

[0072] In one embodiment, the second electrode may be prepared on the light-emitting layer in the opening based on the second evaporation angle by using either a vertical evaporation technique or a point source evaporation technique.

[0073] Wherein, when the second electrode is prepared by vertical evaporation technology, Figure 6c As shown, the evaporation range of the evaporation crucible 520 can cover part of the light-emitting layer 130. When the second electrode is prepared by point source evaporation technology, as shown in FIG. Figure 7 As shown, by rotating the evaporation angle, the second electrode 140 can completely cover the light-emitting layer 130 in the opening, and all edges of the second electrode 140 are in contact with the isolation structure 120, further increasing the overlap area between the second electrode 140 and the isolation structure 120.

[0074] Therefore, the display panel prepared by the method of this embodiment can achieve overlap between the second electrode and the isolation structure, and the overlap area is increased through the gap, thereby improving the reliability of the electrical connection between the second electrode and the isolation structure.

[0075] Based on the same inventive concept, the present application also provides a display device, including the display panel provided in the above embodiment of the present application. Since the principle of solving the problem in the display device embodiment is similar to that in the above display panel embodiment, the implementation of the display device embodiment can refer to the implementation of the above display panel embodiment, and the repeated parts will not be repeated.

[0076] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; A first electrode is disposed on the substrate; an isolation structure, surrounding the first electrode and spaced apart from the first electrode, the isolation structure enclosing to form an opening, the opening exposing the first electrode; a light-emitting layer, located in the opening and overlapping the first electrode; the light-emitting layer comprises a first edge and a second edge arranged opposite to each other, a gap is provided between the second edge and the isolation structure, and a distance between the first edge and the isolation structure is smaller than a distance between the second edge and the isolation structure; as well as The second electrode is located in the opening and is overlapped on a side of the light emitting layer away from the first electrode. The second electrode fills the gap and is electrically connected to the isolation structure.

2. The display panel according to claim 1, characterized in that: The second electrode includes a third edge and a fourth edge that are arranged opposite to each other, the third edge is located on the side where the first edge of the light-emitting layer is located, the fourth edge is located on the side where the second edge of the light-emitting layer is located, and the distance between the third edge and the isolation structure is greater than or equal to the distance between the fourth edge and the isolation structure.

3. The display panel according to claim 1 or 2, characterized in that: The first edge is in contact with the isolation structure; Preferably, the display panel further comprises an encapsulation layer located on a side of the second electrode facing away from the substrate; Preferably, the encapsulation layer is also in contact with a side wall of the isolation structure facing the opening.

4. The display panel according to claim 2, characterized in that: The orthographic projection of the third edge on the substrate is located on a side of the orthographic projection of the first edge on the substrate away from the orthographic projection of the isolation structure on the substrate, and there is a gap between the orthographic projection of the third edge on the substrate and the orthographic projection of the first edge on the substrate; or The second electrode covers the light emitting layer, and the third edge contacts the isolation structure.

5. The display panel according to claim 2, characterized in that: The length of the third edge is smaller than the length of the fourth edge; Preferably, the orthographic projection of the second electrode on the substrate includes any one of a trapezoid, a semicircle and a rectangle.

6. The display panel according to claim 1 or 2, characterized in that: The isolation structure comprises a support portion, the support portion comprises a first surface close to the substrate, and a second surface away from the substrate, wherein the orthographic projection of the second surface on the substrate is located within the range of the orthographic projection of the first surface on the substrate; Preferably, the support portion comprises a conductive material; Preferably, the support portion includes a first portion and a second portion stacked together, the second portion being located on a side of the first portion away from the substrate; a side of the first portion close to the light emitting layer forms a first acute angle with the light emitting direction, a side of the second portion close to the light emitting layer forms a second acute angle with the light emitting direction, and the second acute angle is smaller than the first acute angle; Preferably, at least one of the first portion and the second portion comprises a conductive material; Preferably, the isolation structure further comprises an isolation layer stacked on a side of the second part away from the first part, the second part comprises a third surface in contact with the isolation layer; the orthographic projection of the third surface on the substrate is within the range of the orthographic projection of the isolation layer on the substrate.

7. A method for preparing a display panel, characterized in that: include: Aligning a pre-deposited substrate with an evaporation crucible, wherein the pre-deposited substrate comprises a substrate, a first electrode disposed on the substrate, and an isolation structure, wherein the isolation structure surrounds the first electrode and is spaced apart from the first electrode, and the isolation structure encloses an opening, wherein the opening exposes the first electrode; adjusting the evaporation crucible to a first evaporation angle, and preparing a light-emitting layer in the opening based on the first evaporation angle; The evaporation crucible is adjusted to a second evaporation angle, and a second electrode is prepared on the light-emitting layer in the opening based on the second evaporation angle, wherein the second evaporation angle is opposite to the first evaporation angle.

8. The preparation method according to claim 7, characterized in that: The step of preparing a light-emitting layer in the opening based on the first evaporation angle comprises: The light-emitting layer is obtained by adopting vertical evaporation technology and evaporating the light-emitting material toward the opening based on the first evaporation angle.

9. The preparation method according to claim 7 or 8, characterized in that: The step of preparing a second electrode on the light-emitting layer in the opening based on the second evaporation angle comprises: A second electrode is prepared on the light-emitting layer in the opening based on the second evaporation angle by using either a vertical evaporation technology or a point source evaporation technology.

10. A display device, characterized in that: A display panel comprising any one of claims 1-6.

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