Display panel, preparation method thereof and display device

Abstract

According to the display panel, the preparation method thereof and the display device provided by the invention, the thicknesses of the electrodes with different colors are set to be different, so that the light-emitting effects of the pixels with different colors are optimal, and the display effect of the display panel is improved; meanwhile, due to the fact that the thicknesses of the electrodes of different colors are different, when the packaging layers of different colors are etched by adopting the same etching amount, the thin electrodes are difficult to resist etching and easy to be etched through, and then pits appear on the film layer below. Therefore, the thicknesses of the sub-packaging layers with lower density in the different isolation openings are set to be different, the thinner first color electrode corresponds to the thinner sub-packaging layer, and the thinner sub-packaging layer can be etched with less etching amount, so that the thinner first color electrode is prevented from being etched through, and the processing performance of the display panel is improved.

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) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the process performance of current OLED display products needs to be improved. Summary of the invention

[0004] In view of this, an object of the present application is to provide a display panel that can improve process performance and display effect.

[0005] Based on the above purpose, the present application provides a display panel, which includes:

[0006] substrate;

[0007] A first electrode layer is disposed on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes;

[0008] An isolation structure, disposed on the same side of the substrate as the first electrode layer, the isolation structure enclosing a plurality of isolation openings, the isolation openings comprising first-type isolation openings and second-type isolation openings;

[0009] a light-emitting functional layer, arranged in the isolation opening and covering the first electrode, the light-emitting functional layer being separated by the isolation structure, and comprising a first color light-emitting layer respectively arranged in the first type of isolation opening and a second color light-emitting layer respectively arranged in the second type of isolation opening;

[0010] a second electrode layer, arranged in the isolation opening and covering the light-emitting functional layer, the second electrode layer comprising first color electrodes respectively arranged in the first type of isolation openings and second color electrodes respectively arranged in the second type of isolation openings;

[0011] A first packaging layer, disposed in the isolation opening and covering the second electrode layer, the first packaging layer comprising at least two stacked sub-packaging layers with different densities;

[0012] The thickness of the first color electrode is smaller than that of the second color electrode, and the thickness of the sub-encapsulation layer with lower density in the first type of isolation opening is smaller than that of the sub-encapsulation layer with lower density in the second type of isolation opening.

[0013] In one embodiment, the isolation opening further includes a third type of isolation opening, and the light-emitting functional layer further includes a third color light-emitting layer disposed in the third type of isolation opening;

[0014] Preferably, the thickness of the second color electrode is less than or equal to the thickness of the third color electrode, and the thickness of the sub-encapsulation layer with lower density in the second type of isolation opening is less than or equal to the thickness of the sub-encapsulation layer with lower density in the third type of isolation opening;

[0015] Preferably, the thickness of the third color electrode is less than or equal to the thickness of the first color electrode, and the thickness of the sub-encapsulation layer with lower density in the third type of isolation opening is less than or equal to the thickness of the sub-encapsulation layer with lower density in the first type of isolation opening.

[0016] In one embodiment, the isolation structure includes a support portion and a crown portion, the crown portion is located on a side of the support portion away from the substrate, and the orthographic projection of the support portion on the substrate is located within the orthographic projection of the crown portion on the substrate; wherein the support portion is a conductive structure, and the second electrode layer is electrically connected to the support portion.

[0017] In one embodiment, the first encapsulation layer includes a first sub-encapsulation layer and a second sub-encapsulation layer stacked in sequence in a direction away from the substrate, the density of the first sub-encapsulation layer is greater than the density of the second sub-encapsulation layer, or the density of the second sub-encapsulation layer is greater than the density of the first sub-encapsulation layer;

[0018] In one embodiment, the first packaging layer includes a first sub-packaging layer, a second sub-packaging layer and a third sub-packaging layer which are sequentially stacked in a direction away from the substrate, the second sub-packaging layer is partially filled between the crown and the first electrode layer, and the density of the first sub-packaging layer and the third sub-packaging layer is greater than the density of the second sub-packaging layer.

[0019] In one embodiment, the support portion includes a first support portion and a second support portion, the second support portion is located on a side of the first support portion away from the substrate, the orthographic projection of the second support portion on the substrate is located within the orthographic projection of the first support portion on the substrate, and the second electrode layer overlaps the first support portion;

[0020] Preferably, a lap step is provided on the second supporting portion, and an edge of the second electrode layer overlaps the lap step;

[0021] Preferably, the material of the second supporting portion includes aluminum, and the material of the first supporting portion includes molybdenum.

[0022] In one embodiment, the display panel also includes a pixel defining layer, which is arranged between the isolation structure and the substrate, and the pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the corresponding isolation opening on the substrate, and the pixel defining layer covers the gaps between adjacent first electrodes and the edges of the first electrodes, so that the pixel openings expose the first electrodes.

[0023] In one embodiment, the light-emitting functional layer partially covers the area on the pixel defining layer that is not covered by the isolation structure, and the second electrode layer covers the area on the pixel defining layer that is not covered by the light-emitting functional layer and the isolation structure.

[0024] In one embodiment, the display panel further includes a second encapsulation layer and a third encapsulation layer, the second encapsulation layer covers the first encapsulation layer and the isolation structure, and the third encapsulation layer covers the second encapsulation layer.

[0025] Based on the same inventive concept, the present application also discloses a method for preparing a display panel, which comprises:

[0026] forming a first electrode layer on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes;

[0027] An isolation structure is formed on the same side of the first electrode layer as the substrate, wherein the isolation structure encloses a plurality of isolation openings, and the isolation openings include first-type isolation openings and second-type isolation openings;

[0028] A first color light emitting layer, a first color electrode and a first color encapsulation layer are sequentially formed in the isolation opening and on the isolation structure; the first color encapsulation layer comprises at least two stacked sub-encapsulation layers with different densities;

[0029] Patterning the first color encapsulation layer, the first color light-emitting layer and the first color electrode, removing the first color encapsulation layer, the first color electrode and the first color light-emitting layer on the isolation structure and in the second type of isolation opening, and retaining the first color encapsulation layer, the first color electrode and the first color light-emitting layer in the first type of isolation opening;

[0030] A second color light emitting layer, a second color electrode and a second color encapsulation layer are sequentially formed in the isolation opening and on the isolation structure; the second color encapsulation layer comprises at least two stacked sub-encapsulation layers with different densities;

[0031] The second color encapsulation layer, the second color light-emitting layer and the second color electrode are patterned, and the second color encapsulation layer, the second color electrode and the second color light-emitting layer on the isolation structure and in the first type of isolation opening are removed, and the second color encapsulation layer, the second color electrode and the second color light-emitting layer in the second type of isolation opening are retained; wherein the thickness of the first color electrode is less than the thickness of the second color electrode, and the thickness of the sub-encapsulation layer with lower density in the first color encapsulation layer is less than the thickness of the sub-encapsulation layer with lower density in the second color encapsulation layer.

[0032] Based on the same inventive concept, the present application also discloses a display device, which includes the above-mentioned display panel.

[0033] Compared with the prior art, the display panel provided by the present application sets the thicknesses of electrodes of different colors to be different so as to optimize the light-emitting effects of pixels of different colors, thereby improving the display effect of the display panel.

[0034] Secondly, the first packaging layer includes at least two sub-packaging layers with different densities. The sub-packaging layers with lower density are easier to be stacked into films, which is convenient for filling the voids of the isolation structure to improve the packaging effect.

[0035] At the same time, due to the different thicknesses of electrodes of different colors, if the same etching amount is used to etch different color packaging layers, the thinner electrodes are difficult to resist etching and are easily etched through, which in turn causes pits in the film layer below; therefore, the thicknesses of the lower-density sub-packaging layers in different isolation openings are also set differently, and the thinner first color electrode corresponds to the thinner sub-packaging layer, and the thinner sub-packaging layer requires less etching amount to achieve etching, thereby avoiding the thinner first color electrode from being etched through, thereby improving the process performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic diagram of a related display panel;

[0038] Figure 2 is a schematic diagram of a hierarchical structure of a related display panel;

[0039] Figure 3 A schematic diagram of the layer structure of a display panel provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0041] Figure 5 A schematic diagram of an isolation structure in a display panel provided in an embodiment of the present application;

[0042] Figure 6 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0043] Figure 7 A schematic diagram of the layer structure of a display panel provided in another embodiment of the present application;

[0044] Figure 8 A flow chart of a method for preparing a display panel is provided for another embodiment of the present application;

[0045] Figures 9a to 9c FIG. 4 is a schematic diagram of a method for manufacturing a display panel in another embodiment of the present application.

[0046] Marking Description:

[0047] 100. Display panel;

[0048] 1. substrate; 11. pit;

[0049] 2. Isolation structure; 21. Isolation opening; 211. First type of isolation opening; 212. Second type of isolation opening; 213. Third type of isolation opening; 22. Supporting part; 221. First supporting part; 222. Second supporting part; 223. Overlapping step; 23. Crown;

[0050] 3. Light-emitting unit; 31. First electrode; 321. First color light-emitting layer; 322. Second color light-emitting layer; 323. Third color light-emitting layer; 331. First color electrode; 332. Second color electrode; 333. Third color electrode;

[0051] 41. first color encapsulation layer; 42. second color encapsulation layer; 43. third color encapsulation layer;

[0052] 5. Pixel definition layer; 51. Pixel opening. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0054] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] Reference Figure 1-2 As shown, it is a structural schematic diagram of a related display panel, which includes a substrate 1 and an isolation structure 2 arranged on one side of the substrate 1. The isolation structure 2 encloses an isolation opening 21 for accommodating the light-emitting unit 3. Adjacent light-emitting units 3 are separated by the isolation structure 2. The light-emitting units 3 generally include R, G, and B, which are respectively used to emit red light, green light, and blue light. Therefore, the above-mentioned isolation opening 21 also includes a plurality of types of openings for accommodating different light-emitting units 3.

[0056] Among them, an isolation structure 2 is set at the gap between the light-emitting units 3 to separate the functional film layers of adjacent light-emitting units 3. In this way, in the evaporation process of multiple functional film layers, it is only necessary to perform full-surface evaporation on the display panel 100, without the need to use a mask plate to evaporate the area where the light-emitting unit 3 is located to form a functional film layer. Therefore, the process of evaporation using the isolation structure 2 does not need to consider the alignment accuracy during evaporation, so that the gap between the light-emitting units 3 can be designed to be smaller in size to increase the pixel density.

[0057] At the same time, the display panel 100 based on the isolation structure 2 is also convenient for forming cathodes of different thicknesses for R, G, and B. The cathodes of different thicknesses are conducive to improving the color deviation of the viewing angle, brightness decay, etc. However, when etching the encapsulation layer on the cathode, the thinner cathode is easily etched through, and then the film layer below is etched to form a pit 11, which affects the continuity of subsequent film formation and even produces dark spots. Figure 2 .

[0058] Based on this, the present application provides a display panel solution, as detailed in the following embodiments.

[0059] Reference Figure 3 As shown, an embodiment of the present application discloses a display panel 100, which includes a substrate 1, a first electrode layer, an isolation structure 2, a light-emitting functional layer, a second electrode layer and a first packaging layer.

[0060] The first electrode layer is disposed on one side of the substrate 1 , and includes a plurality of first electrodes 31 .

[0061] The isolation structure 2 and the first electrode layer are disposed on the same side of the substrate 1 . The isolation structure 2 encloses a plurality of isolation openings 21 . The isolation openings 21 include first-type isolation openings 211 and second-type isolation openings 212 .

[0062] The light-emitting functional layer is arranged in the isolation opening 21 and covers the first electrode 31 . The light-emitting functional layer is separated by the isolation structure 2 . The light-emitting functional layer includes a first color light-emitting layer 321 respectively arranged in the first type of isolation opening 211 and a second color light-emitting layer respectively arranged in the second type of isolation opening 212 .

[0063] The second electrode layer is disposed in the isolation opening 21 and covers the light-emitting functional layer. The second electrode layer includes first color electrodes 331 disposed in the first type isolation opening 211 and second color electrodes 332 disposed in the second type isolation opening 212 .

[0064] The first packaging layer is disposed in the isolation opening 21 and covers the second electrode layer. The first packaging layer includes at least two stacked sub-packaging layers with different densities.

[0065] The thickness of the first color electrode 331 is smaller than that of the second color electrode 332 , and the thickness of the sub-encapsulation layer with lower density in the first type isolation opening 211 is smaller than that of the sub-encapsulation layer with lower density in the second type isolation opening 212 .

[0066] The first electrode 31 , the first color light-emitting layer 321 and the first color electrode 331 constitute a first color light-emitting unit 3 , and the first electrode 31 , the second color light-emitting layer 322 and the second color electrode 332 constitute a second color light-emitting unit 3 .

[0067] Specifically, the first encapsulation layer includes a first color encapsulation layer 41 and a second color encapsulation layer 42 respectively disposed in the first type isolation opening 211 and the second color encapsulation layer 42 respectively includes at least two stacked sub-encapsulation layers with different densities.

[0068] The display panel 100 provided in this embodiment sets the thicknesses of electrodes of different colors to be different so as to optimize the light-emitting effects of pixels of different colors, thereby improving the display effect of the display panel 100 .

[0069] After long-term research, the inventors found that the thickness of the current packaging layers of different colors is the same, the packaging layers are prepared by dry etching, and the etching amounts corresponding to the packaging layers of different colors are the same, while the metal material of the second electrode is not resistant to dry etching. The thicker electrode has a stronger ability to resist etching, while the thinner electrode is easily etched through, which leads to pits in the film layer below.

[0070] In the display panel 100 provided in this embodiment, the first encapsulation layer includes at least two sub-encapsulation layers with different densities. The sub-encapsulation layers with lower density are easier to be stacked into films, so as to fill the voids of the isolation structure 2 and improve the encapsulation effect.

[0071] The display panel 100 provided in this embodiment also sets the thickness of the lower-density sub-packaging layer in different isolation openings 21 to be different. The thinner first color electrode 331 corresponds to the thinner sub-packaging layer, and the thinner sub-packaging layer requires less etching amount to be etched, thereby avoiding the thinner first color electrode 331 from being etched through, thereby improving the process performance of the display panel.

[0072] In one embodiment, the first color is red and the second color is blue or green; in another embodiment, the first color is blue and the second color is red-blue or green; in another embodiment, the first color is green and the second color is blue or red.

[0073] Optionally, the first electrode 31 is an anode, and the second electrode is a cathode.

[0074] Reference Figure 4 As shown, in one embodiment, the isolation structure 2 includes a support portion 22 and a crown portion 23, the crown portion 23 is located on the side of the support portion 22 away from the substrate 1, and the orthographic projection of the support portion on the substrate 1 is located within the orthographic projection of the crown portion 23 on the substrate 1; wherein the support portion 22 is a conductive structure, and the second electrode layer is electrically connected to the support portion 22. In this way, at least the portion of the isolation structure 2 away from the substrate 1 is set to a shape that is wide at the top and narrow at the bottom, so that the isolation structure 2 can block the light-emitting functional layer of the adjacent light-emitting unit 3 to reduce the current crosstalk problem of the adjacent light-emitting unit 3.

[0075] Reference Figure 4 and 5 As shown, in one embodiment, the support portion 22 includes a first support portion 221 and a second support portion 222, the second support portion 222 is located on a side of the first support portion 221 away from the substrate 1, the orthographic projection of the second support portion 222 on the substrate 1 is located within the orthographic projection of the first support portion 221 on the substrate 1, and the second electrode layer overlaps the first support portion 221, which is beneficial to ensure the stability of the electrical connection between the second electrode and the support portion 22.

[0076] Preferably, the second support portion 222 is provided with an overlapping step 223, and the edge of the second electrode layer overlaps the overlapping step 223. The overlapping step 223 can realize the electrical connection between the second electrode layer and the first support portion 221 and the second support portion 222 at the same time, thereby improving the electrical connection effect between the second electrode layer and the support portion 22.

[0077] Preferably, the material of the second support portion 222 includes aluminum or the like, and the material of the first support portion 221 includes molybdenum or the like.

[0078] In one embodiment, the first encapsulation layer includes a first sub-encapsulation layer and a second sub-encapsulation layer stacked in sequence in a direction away from the substrate 1, and the density of the first sub-encapsulation layer is greater than the density of the second sub-encapsulation layer. In another embodiment, the density of the second sub-encapsulation layer is greater than the density of the first sub-encapsulation layer. In both arrangement directions, the cavity between the support portion 22 and the crown portion 23 can be filled with a sub-encapsulation layer of lower density to improve the encapsulation effect. Among them, the sub-encapsulation layer of lower density plays a role in protecting the sub-encapsulation layer of lower density.

[0079] In one embodiment, the first encapsulation layer includes a first sub-encapsulation layer, a second sub-encapsulation layer and a third sub-encapsulation layer which are sequentially stacked in a direction away from the substrate 1, the second sub-encapsulation layer is partially filled between the crown 23 and the first electrode layer, and the density of the first sub-encapsulation layer and the third sub-encapsulation layer is greater than that of the second sub-encapsulation layer. Among them, the density of the second encapsulation layer is lower, and it is easier to accumulate into a film, which can effectively fill the void between the support portion 22 and the crown 23 to improve the encapsulation effect, and avoid part of the gas entering the void during dry etching to damage the support portion 22, and further cause damage to the pixel; while the density of the first encapsulation layer and the third encapsulation layer is higher, which can effectively protect the second encapsulation layer and improve the encapsulation effect.

[0080] Reference Figure 7 As shown, in one embodiment, the isolation opening 21 further includes a third type of isolation opening 213, the light-emitting functional layer further includes a third color light-emitting layer 323 disposed in the third type of isolation opening 213, and the first encapsulation layer further includes a third color encapsulation layer 43 disposed in the third type of isolation opening 213. The first color light-emitting layer 321, the second color light-emitting layer 322, and the third color light-emitting layer 323 are three light-emitting layers for emitting light of different colors, specifically red light, green light, and blue light, to enhance the richness of the display of the display panel 100.

[0081] In one embodiment, the first color is red, the second color is blue, and the third color is green; in another embodiment, the first color is red, the second color is green, and the third color is blue; in another embodiment, the first color is blue, the second color is red, and the third color is green; in another embodiment, the first color is blue, the second color is green, and the third color is red; in another embodiment, the first color is green, the second color is blue, and the third color is red; in another embodiment, the first color is green, the second color is red, and the third color is blue. It can be set according to the required lighting effect, and is not specifically limited.

[0082] In one embodiment, the thickness of the second color electrode 332 is less than or equal to the thickness of the third color electrode 333, and the thickness of the sub-encapsulation layer with a smaller density in the second color encapsulation layer 42 is less than or equal to the thickness of the sub-encapsulation layer with a smaller density in the third color encapsulation layer 43. Specifically, when the thickness of the second color electrode 332 is less than the thickness of the third color electrode 333, the thickness of the sub-encapsulation layer with a smaller density in the second color encapsulation layer 42 is less than the thickness of the sub-encapsulation layer with a smaller density in the third color encapsulation layer 43; when the thickness of the second color electrode 332 is equal to the thickness of the third color electrode 333, the thickness of the sub-encapsulation layer with a smaller density in the second color encapsulation layer 42 is equal to the thickness of the sub-encapsulation layer with a smaller density in the third color encapsulation layer 43. That is, the thinner the thickness of the second electrode layer is, the weaker the etching resistance is, and the smaller the thickness of the sub-encapsulation layer with a smaller density in the corresponding first encapsulation layer is, the smaller the etching amount is required, and it is not easy to etch through the thinner second electrode layer.

[0083] In one embodiment, the thickness of the third color electrode 333 is less than or equal to the thickness of the first color electrode 331, and the thickness of the sub-encapsulation layer with a smaller density in the third color encapsulation layer 43 is less than or equal to the thickness of the sub-encapsulation layer with a smaller density in the first color encapsulation layer 41. Specifically, when the thickness of the third color electrode 333 is less than the thickness of the first color electrode 331, the thickness of the sub-encapsulation layer with a smaller density in the third color encapsulation layer 43 is less than the thickness of the sub-encapsulation layer with a smaller density in the first color encapsulation layer 41, the thickness of the third color electrode 333 is equal to the thickness of the first color electrode 331, and the thickness of the third color encapsulation layer 43 is equal to the thickness of the first color encapsulation layer 41.

[0084] Please refer to Figure 6As shown, in one embodiment, the display panel 100 further includes a pixel defining layer 5, which is disposed between the isolation structure 2 and the substrate 1, and defines a plurality of pixel openings 51 corresponding to the isolation openings 21, respectively, and the pixel openings 51 are connected to the corresponding isolation openings 21, and the orthographic projection of the pixel opening 51 on the substrate 1 is located within the orthographic projection of the corresponding isolation opening 21 on the substrate 1, and the pixel defining layer 5 covers the gaps between adjacent first electrodes 31 and the edges of the first electrodes 31, so that the pixel openings expose the first electrodes 31. Thus, the first electrode 31 can have a larger design area without contacting the isolation structure 2, so that the light-emitting unit 3 has a larger effective light-emitting area.

[0085] In one embodiment, the light-emitting functional layer partially covers the area on the pixel defining layer 5 that is not covered by the isolation structure 2, and the second electrode layer covers the area on the pixel defining layer 5 that is not covered by the light-emitting functional layer and the isolation structure 2. A sufficiently large light-emitting area can be ensured, and at the same time, the second electrode layer is electrically connected to the side of the support portion 22, so that the support portion 22 of the isolation structure 2 connects the second electrode layer in series, so that the support portion 22 and the second electrode layer constitute a common electrode for easy driving.

[0086] In one embodiment, the display panel 100 further includes a second encapsulation layer and a third encapsulation layer, wherein the second encapsulation layer covers the first encapsulation layer and the isolation structure 2, and the third encapsulation layer covers the second encapsulation layer. The first encapsulation layer and the third encapsulation layer are inorganic layers, and the inorganic layers have high density to isolate water and oxygen, and the second encapsulation layer is an organic layer, so it has a large thickness to flatten the surface of the display panel, thereby realizing inorganic-organic-inorganic three-layer encapsulation.

[0087] Based on the same inventive concept, Figure 8 As shown, another embodiment of the present application discloses a method for preparing a display panel, and the method for preparing a display panel includes the following steps:

[0088] Step S10 , forming a first electrode layer on one side of the substrate 1 , wherein the first electrode layer includes a plurality of first electrodes 31 .

[0089] Step S20, forming an isolation structure 2 on the same side of the first electrode layer relative to the substrate 1, wherein the isolation structure 2 encloses a plurality of isolation openings, wherein the isolation openings include a first type of isolation opening 211 and a second type of isolation opening 212; Figure 9a .

[0090] Step S30, forming a first color light emitting layer 321, a first color electrode 331 and a first color encapsulation layer 41 in sequence in the isolation opening and on the isolation structure 2; Figure 9bSpecifically, the whole surface can be formed by evaporation. The first color encapsulation layer 41 includes at least two stacked sub-encapsulation layers with different densities;

[0091] Step S40, patterning the first color encapsulation layer 41, the first color light-emitting layer 321 and the first color electrode 331, removing the first color encapsulation layer 41, the first color electrode 331 and the first color light-emitting layer 321 on the isolation structure 2 and in the second type isolation opening 212, and retaining the first color encapsulation layer 41, the first color electrode 331 and the first color light-emitting layer 321 in the first type isolation opening 211; Fig.9c .

[0092] Specifically, the first color encapsulation layer 41 on the isolation structure 2 and in the second type isolation opening 212 is first removed by wet etching, and then the first color electrode 331 and the first color light emitting layer 321 on the isolation structure 2 and in the second type isolation opening 212 are removed by dry etching.

[0093] The first electrode 31 , the first color light emitting layer 321 and the first color electrode 331 constitute a first color light emitting unit 3 .

[0094] Step S50, forming the second color light emitting layer 322, the second color electrode 332 and the second color encapsulation layer 42 in the isolation opening and on the isolation structure 2 in sequence. Specifically, the second color encapsulation layer 42 may be formed by full-surface evaporation. The second color encapsulation layer 42 includes two stacked sub-encapsulation layers with different densities;

[0095] Step S60, patterning the second color encapsulation layer 42, the second color light-emitting layer and the second color electrode 332, removing the second color encapsulation layer 42, the second color electrode 332 and the second color light-emitting layer on the isolation structure 2 and in the first type of isolation opening 211, and retaining the second color encapsulation layer 42, the second color electrode 332 and the second color light-emitting layer in the second type of isolation opening 212; wherein the thickness of the sub-encapsulation layer with lower density in the first color encapsulation layer 41 is less than the thickness of the sub-encapsulation layer with lower density in the second color encapsulation layer 42; refer to Figure 3 .

[0096] Specifically, the second color encapsulation layer 42 is firstly removed by wet etching, and then the second color electrode 332 and the second color light emitting layer 322 are removed by dry etching.

[0097] The first electrode 31 , the second color light emitting layer 322 and the second color electrode 332 constitute a second color light emitting unit 3 .

[0098] The method for manufacturing a display panel provided in this embodiment sets the thicknesses of electrodes of different colors to be different so as to optimize the light-emitting effects of pixels of different colors, thereby improving the display effect of the display panel 100 .

[0099] The method for preparing the display panel provided in this embodiment sets the thickness of the lower-density sub-packaging layers in the first color packaging layers 41 and the second color packaging layers 42 of different colors to be different. The thinner first color electrode 331 corresponds to the thinner sub-packaging layer, and the thinner sub-packaging layer requires less etching amount to be etched, thereby avoiding the thinner first color electrode 331 from being etched through, thereby improving the process performance of the display panel.

[0100] The specific structure, materials, mechanism, etc. of the display panel 100 prepared in the method for preparing the display panel of this embodiment can refer to the above-mentioned display panel embodiment, and will not be described in detail here.

[0101] Another embodiment of the present application discloses a display device, which includes the display panel 100 in the above embodiment. The display device can be on a smart device (such as a mobile phone, VR device, computer, television, car display, etc.).

[0102] The display device in this embodiment has a display panel 100 that sets the thicknesses of different color electrodes to be different so as to optimize the luminous effects of different color pixels. At the same time, by setting the thicknesses of the lower-density sub-packaging layers in different isolation openings 21 to be different, the thinner first color electrode 331 corresponds to the thinner sub-packaging layer, and the thinner sub-packaging layer requires less etching amount to be etched, thereby avoiding the thinner first color electrode 331 from being etched through, thereby improving the performance of the display device.

[0103] Patent applications PCT / CN2023 / 134518, 202310759370.2, 202310740412.8, 202310707209.0, and 202311346196.5 record relevant technical solutions of the isolation structure 2, and their contents are incorporated into this application by reference for reference.

[0104] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0105] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0106] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A first electrode layer is disposed on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes; An isolation structure, disposed on the same side of the substrate as the first electrode layer, the isolation structure enclosing a plurality of isolation openings, the isolation openings comprising first-type isolation openings and second-type isolation openings; a light-emitting functional layer, arranged in the isolation opening and covering the first electrode, the light-emitting functional layer being separated by the isolation structure, and comprising a first color light-emitting layer respectively arranged in the first type of isolation opening and a second color light-emitting layer respectively arranged in the second type of isolation opening; a second electrode layer, arranged in the isolation opening and covering the light-emitting functional layer, the second electrode layer comprising first color electrodes respectively arranged in the first type of isolation openings and second color electrodes respectively arranged in the second type of isolation openings; A first packaging layer, disposed in the isolation opening and covering the second electrode layer, the first packaging layer comprising at least two stacked sub-packaging layers with different densities; The thickness of the first color electrode is smaller than that of the second color electrode, and the thickness of the sub-encapsulation layer with lower density in the first type of isolation opening is smaller than that of the sub-encapsulation layer with lower density in the second type of isolation opening.

2. The display panel according to claim 1, wherein: The isolation opening further includes a third type of isolation opening, and the light-emitting functional layer further includes a third color light-emitting layer arranged in the third type of isolation opening; Preferably, the thickness of the second color electrode is less than or equal to the thickness of the third color electrode, and the thickness of the sub-encapsulation layer with lower density in the second type of isolation opening is less than or equal to the thickness of the sub-encapsulation layer with lower density in the third type of isolation opening; Preferably, the thickness of the third color electrode is less than or equal to the thickness of the first color electrode, and the thickness of the sub-encapsulation layer with lower density in the third type of isolation opening is less than or equal to the thickness of the sub-encapsulation layer with lower density in the first type of isolation opening.

3. The display panel according to claim 1, wherein: The isolation structure includes a support portion and a crown portion, wherein the crown portion is located on a side of the support portion away from the substrate, and an orthographic projection of the support portion on the substrate is located within an orthographic projection of the crown portion on the substrate; wherein the support portion is a conductive structure, and the second electrode layer is electrically connected to the support portion.

4. The display panel according to claim 3, wherein: The first encapsulation layer comprises a first sub-encapsulation layer and a second sub-encapsulation layer which are sequentially stacked in a direction away from the substrate, the density of the first sub-encapsulation layer is greater than the density of the second sub-encapsulation layer, or the density of the second sub-encapsulation layer is greater than the density of the first sub-encapsulation layer; Preferably, the first encapsulation layer includes a first sub-encapsulation layer, a second sub-encapsulation layer and a third sub-encapsulation layer which are stacked in sequence in a direction away from the substrate, the second sub-encapsulation layer is partially filled between the crown and the first electrode layer, and the density of the first sub-encapsulation layer and the third sub-encapsulation layer is greater than the density of the second sub-encapsulation layer.

5. The display panel according to claim 3, wherein: The support portion includes a first support portion and a second support portion, the second support portion is located on a side of the first support portion away from the substrate, the orthographic projection of the second support portion on the substrate is located within the orthographic projection of the first support portion on the substrate, and the second electrode layer overlaps the first support portion; Preferably, a lap step is provided on the second supporting portion, and an edge of the second electrode layer overlaps the lap step; Preferably, the material of the second supporting portion includes aluminum, and the material of the first supporting portion includes molybdenum.

6. The display panel according to claim 1, wherein: The display panel also includes a pixel defining layer, which is arranged between the isolation structure and the substrate. The pixel defining layer defines a plurality of pixel openings corresponding to the isolation openings respectively, and the pixel openings are connected to the corresponding isolation openings. The orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the corresponding isolation opening on the substrate, and the pixel defining layer covers the gaps between adjacent first electrodes and the edges of the first electrodes, so that the pixel openings expose the first electrodes.

7. The display panel according to claim 6, wherein: The light-emitting functional layer partially covers the area on the pixel defining layer that is not covered by the isolation structure, and the second electrode layer covers the area on the pixel defining layer that is not covered by the light-emitting functional layer and the isolation structure.

8. The display panel according to claim 1, wherein: The display panel further includes a second encapsulation layer and a third encapsulation layer, the second encapsulation layer covers the first encapsulation layer and the isolation structure, and the third encapsulation layer covers the second encapsulation layer.

9. A method for preparing a display panel, characterized in that: include: forming a first electrode layer on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes; An isolation structure is formed on the same side of the first electrode layer as the substrate, wherein the isolation structure encloses a plurality of isolation openings, and the isolation openings include first-type isolation openings and second-type isolation openings; A first color light emitting layer, a first color electrode and a first color encapsulation layer are sequentially formed in the isolation opening and on the isolation structure; the first color encapsulation layer comprises at least two stacked sub-encapsulation layers with different densities; Patterning the first color encapsulation layer, the first color light-emitting layer and the first color electrode, removing the first color encapsulation layer, the first color electrode and the first color light-emitting layer on the isolation structure and in the second type of isolation opening, and retaining the first color encapsulation layer, the first color electrode and the first color light-emitting layer in the first type of isolation opening; A second color light emitting layer, a second color electrode and a second color encapsulation layer are sequentially formed in the isolation opening and on the isolation structure; the second color encapsulation layer comprises at least two stacked sub-encapsulation layers with different densities; The second color encapsulation layer, the second color light-emitting layer and the second color electrode are patterned, and the second color encapsulation layer, the second color electrode and the second color light-emitting layer on the isolation structure and in the first type of isolation opening are removed, and the second color encapsulation layer, the second color electrode and the second color light-emitting layer in the second type of isolation opening are retained; wherein the thickness of the first color electrode is less than the thickness of the second color electrode, and the thickness of the sub-encapsulation layer with lower density in the first color encapsulation layer is less than the thickness of the sub-encapsulation layer with lower density in the second color encapsulation layer.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 8.

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