Display panel, display device and preparation method of display panel

Abstract

The invention discloses a display panel, a display device and a preparation method of the display panel. The display panel comprises an array substrate, an isolation structure, a light-emitting layer, a first electrode layer and a lap joint function layer. The isolation structures are arranged on the array substrate and enclose to form the multiple isolation openings, so that the light-emitting layer is partitioned to form the light-emitting units which are mutually disconnected, a precise mask plate does not need to be adopted for preparing the light-emitting units, development and use of the precise mask plate can be reduced, and the preparation cost is reduced. The first electrode layer is separated to form first electrodes which are mutually spaced. The lap joint function layer comprises a conductive part and a light-transmitting part, and the arrangement of the light-transmitting part can reduce the distribution area of the conductive part so as to reduce the light-emitting shielding of the conductive part to the light-emitting unit. A gap is formed between the light-transmitting part and the isolation structure to arrange the conductive part, and the conductive part is electrically connected with the isolation structure, so that the lap joint effect of the first electrode and the isolation structure is improved, the contact resistance between the first electrode and the isolation structure is reduced, and the use performance of the display panel is improved.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a display panel, a display device and a method for manufacturing a display panel. Background Technology

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on light emitting diode (LED) technologies have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages of high image quality, power saving, thin body and wide application range, becoming the mainstream of display devices.

[0003] However, the performance of current OLED display products needs to be improved. SUMMARY OF THE INVENTION

[0004] The embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel, aiming to improve the performance of the display panel.

[0005] The first aspect of the present application provides a display panel, which includes: an array substrate; an isolation structure located on the array substrate, the isolation structure enclosing a plurality of isolation openings; a light-emitting layer located on the array substrate, the light-emitting layer including a light-emitting unit located in the isolation opening; a first electrode layer disposed in the isolation opening and located on a side of the light-emitting unit away from the array substrate, the first electrode layer including a plurality of first electrodes, the first electrodes being electrically connected to the isolation structure; a lap function layer disposed in the isolation opening and located on a side of the first electrode layer away from the array substrate, the lap function layer including a conductive portion and a light-transmitting portion, at least a portion of the light-transmitting portion having a gap with the isolation structure, at least a portion of the conductive portion being located in the gap and in contact with the isolation structure.

[0006] According to the implementation of the first aspect of the present application, the gap is located on the peripheral side of the light-transmitting portion, and the conductive portion is arranged in a ring shape around the light-transmitting portion.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the light-transmitting portion includes an organic material.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the organic material is a cathode patterning material.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the conductive portion includes a metallic conductive material.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the conductive portion is greater than or equal to the thickness of the light-transmitting portion.

[0011] According to any of the foregoing embodiments of the first aspect of the present application, the thickness of the conductive portion is 10 nm to 1000 nm.

[0012] According to any of the foregoing embodiments of the first aspect of the present application, the thickness of the light-transmitting portion is 10 nm to 100 nm.

[0013] According to any of the foregoing embodiments of the first aspect of the present application, the display panel further includes: a light extraction layer located on the side of the overlapping functional layer away from the array substrate.

[0014] According to any of the foregoing embodiments of the first aspect of the present application, the light extraction layer includes a first refractive layer and a second refractive layer, the second refractive layer is located on the side of the first refractive layer away from the array substrate, and the refractive index of the first refractive layer is greater than that of the second refractive layer.

[0015] According to any of the foregoing embodiments of the first aspect of the present application, the difference between the refractive index of the first refractive layer and the refractive index of the second refractive layer is greater than or equal to 0.4.

[0016] According to any of the foregoing embodiments of the first aspect of the present application, the refractive index of the first refractive layer is greater than the refractive index of the light-transmitting portion.

[0017] According to any of the foregoing embodiments of the first aspect of the present application, the light-emitting unit includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit, the light extraction layer includes a first light extraction portion, a second light extraction portion, and a third light extraction portion, the first light extraction portion and the red light-emitting unit are correspondingly arranged, the second light extraction portion and the green light-emitting unit are correspondingly arranged, the third light extraction portion and the blue light-emitting unit are correspondingly arranged, wherein the thickness of the first light extraction portion is greater than the thickness of the second light extraction portion, and / or the thickness of the second light extraction portion is greater than the thickness of the third light extraction portion.

[0018] According to any of the foregoing embodiments of the first aspect of the present application, the isolation structure includes a first conductive layer and a second layer located on the side of the first conductive layer away from the array substrate, and the orthographic projection of the first conductive layer on the array substrate is within the orthographic projection of the second layer on the array substrate.

[0019] According to any of the foregoing embodiments of the first aspect of the present application, the second layer includes a conductive material or an insulating material.

[0020] According to any of the foregoing embodiments of the first aspect of the present application, the second layer includes a metal material, and the materials of the first conductive layer and the second layer are different.

[0021] According to any of the foregoing embodiments of the first aspect of the present application, the first electrode is electrically connected to the first conductive layer.

[0022] According to any of the foregoing embodiments of the first aspect of the present application, the conductive portion is electrically connected to the first conductive layer.

[0023] According to any of the foregoing embodiments of the first aspect of the present application, the isolation structure further includes a third layer on the side of the first conductive layer facing the array substrate, and the orthographic projection of the first conductive layer on the array substrate is within the orthographic projection of the third layer on the array substrate.

[0024] According to any of the foregoing embodiments of the first aspect of the present application, the first electrode is connected to both the first conductive layer and the third layer.

[0025] According to any of the foregoing embodiments of the first aspect of the present application, the distance between the surface of the light extraction layer facing away from the array substrate and the array substrate is a first distance, and the distance between the surface of the second layer close to the array substrate and the array substrate is a second distance, and the first distance is less than or equal to the second distance.

[0026] According to any of the foregoing embodiments of the first aspect of the present application, the display panel further includes: a pixel definition layer located on the array substrate, the pixel definition layer includes pixel defining portions and pixel openings formed by enclosing the pixel defining portions, at least part of the light-emitting units are located in the pixel openings, and the pixel openings communicate with the isolation openings.

[0027] According to any of the foregoing embodiments of the first aspect of the present application, the isolation structure is located on the side of the pixel defining portion facing away from the array substrate.

[0028] According to any of the foregoing embodiments of the first aspect of the present application, accommodation openings are formed in the pixel defining portions, and the isolation structure is located in the accommodation openings.

[0029] According to any of the foregoing embodiments of the first aspect of the present application, the display panel further includes pixel electrodes, and at least part of the pixel electrodes are exposed by the pixel openings.

[0030] According to any of the foregoing embodiments of the first aspect of the present application, the pixel electrode includes a main body portion exposed by the pixel opening, and the orthographic projection of the main body portion on the array substrate is within the orthographic projection of the light-transmitting portion on the array substrate.

[0031] An embodiment of the second aspect of the present application provides a display device, which includes the display panel of any of the foregoing embodiments.

[0032] An embodiment of the third aspect of the present application provides a method for manufacturing a display panel, including:

[0033] Preparing an isolation structure on the array substrate, and the isolation structure encloses a plurality of isolation openings;

[0034] Preparing a light-emitting layer on the array substrate, and the light-emitting layer includes light-emitting units located in the isolation openings;

[0035] Preparing a first electrode layer on the side of the light-emitting layer facing away from the array substrate, the first electrode layer is disposed in the isolation openings and includes a plurality of first electrodes, and the first electrodes are electrically connected to the isolation structure;

[0036] A lap joint functional layer is prepared on a side of the first electrode layer facing away from the array substrate. The lap joint functional layer is disposed within the isolation opening and includes a conductive portion and a light-transmitting portion. There is a gap between at least a part of the light-transmitting portion and the isolation structure, and at least a part of the conductive portion is located in the gap and is in contact connection with the isolation structure.

[0037] According to an embodiment of the third aspect of the present application, the light-transmitting portion includes a cathode patterning material, and the conductive portion includes a metal conductive material. In the step of preparing the lap joint functional layer on the side of the first electrode layer facing away from the array substrate, the method further includes:

[0038] A light-transmitting portion is prepared on the side of the first electrode layer facing away from the array substrate by using a precision mask plate, and there is a gap between at least a part of the light-transmitting portion and the isolation structure;

[0039] A conductive portion is prepared on the side of the light-transmitting portion facing away from the array substrate by using a general mask plate, and at least a part of the conductive portion is located in the gap and is in contact connection with the isolation structure.

[0040] According to the display panel of the embodiment of the present application, the display panel includes an array substrate, an isolation structure, a light-emitting layer, a first electrode layer, and a lap joint functional layer. The isolation structure is disposed on the array substrate and encloses to form a plurality of isolation openings to partition the light-emitting layer into mutually disconnected light-emitting units, thereby reducing the crosstalk of carriers in the light-emitting layer and improving the display effect of the display panel. Moreover, when preparing the light-emitting units, a precision mask plate is not required, which can reduce the development and use of the precision mask plate and lower the manufacturing cost. The first electrode layer is partitioned into mutually spaced first electrodes, and each first electrode is electrically connected to each other through the isolation structure to form a full-surface electrode. The lap joint functional layer includes a conductive portion and a light-transmitting portion. The arrangement of the light-transmitting portion can reduce the distribution area of the conductive portion to reduce the light shielding of the conductive portion on the light-emitting units. There is a gap between the light-transmitting portion and the isolation structure to dispose the conductive portion. The conductive portion is electrically connected to the isolation structure, thereby improving the lap joint effect between the first electrode and the isolation structure, reducing the contact resistance between the first electrode and the isolation structure, and improving the service performance of the display panel. Description of the Drawings

[0041] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present application will become more apparent. Among them, the same or similar reference numerals represent the same or similar features, and the drawings are not drawn to actual scale.

[0042] Figure 1 is a partial cross-sectional view of a display panel provided by an embodiment of the present application;

[0043] Figure 2 is a partial top view of a display panel provided by an embodiment of the present application;

[0044] Figure 3is a partial cross-sectional view of a display panel in another embodiment;

[0045] Figure 4 is a partial cross-sectional view of a display panel in yet another embodiment;

[0046] Figure 5 is a partial cross-sectional view of a display panel in still another embodiment;

[0047] Figure 6 is a partial cross-sectional view of a display panel in still another embodiment;

[0048] Figure 7 is a partial cross-sectional view of a display panel in still another embodiment;

[0049] Figure 8 is a partial cross-sectional view of a display panel in still another embodiment;

[0050] Figure 9 is a schematic flowchart of a method for manufacturing a display panel provided by an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 10, display panel;

[0053] 100, array substrate;

[0054] 200, isolation structure; 210, first conductive layer; 220, second layer; 230, third layer; 240, isolation opening;

[0055] 300, light-emitting layer; 310, light-emitting unit; 311, red light-emitting unit, 312, green light-emitting unit; 313, blue light-emitting unit;

[0056] 400, first electrode layer; 410, first electrode;

[0057] 500, overlapping functional layer; 510, conductive part; 520, light-transmitting part; 530, gap;

[0058] 600, light extraction layer; 601, first light extraction part; 602, second light extraction part; 603, third light extraction part; 610, first refraction layer; 620, second refraction layer;

[0059] 700, pixel definition layer; 710, pixel defining part; 720, pixel opening; 730, pixel electrode; 740, accommodation opening;

[0060] D1, first distance; D2, second distance. Detailed implementation manners

[0061] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only provided to provide a better understanding of the present application by showing examples of the present application.

[0062] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device comprising the said elements.

[0063] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "above" or "over" another layer or another region, it may mean directly above the other layer or another region, or there may be other layers or regions between it and the other layer or another region. And if the component is turned over, this layer or region will be "below" or "beneath" the other layer or another region.

[0064] Embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel. The following will describe the embodiments of the display panel, the display device, and the method for manufacturing a display panel in conjunction with the accompanying drawings.

[0065] Embodiments of the present application provide a display panel, which may be an Organic Light Emitting Diode (OLED) display panel.

[0066] Please refer to Figure 1 and Figure 2 , Figure 1 which is a partial cross-sectional view of a display panel provided by an embodiment of the present application; Figure 2 which is a partial top view of a display panel provided by an embodiment of the present application.

[0067] AsFigure 1 and Figure 2 As shown in Figure 2 , an embodiment of the first aspect of the present application provides a display panel 10, which includes an array substrate 100, an isolation structure 200, a light-emitting layer 300, a first electrode layer 400, and a lapping functional layer 500. The isolation structure 200 is located on the array substrate 100, and the isolation structure 200 encloses to form a plurality of isolation openings 240. The light-emitting layer 300 is located on the array substrate 100, and the light-emitting layer 300 includes light-emitting units 310 located in the isolation openings 240. The first electrode layer 400 is disposed in the isolation openings 240 and on the side of the light-emitting units 310 away from the array substrate 100. The first electrode layer 400 includes a plurality of first electrodes 410, and the first electrodes 410 are electrically connected to the isolation structure 200. The lapping functional layer 500 is disposed in the isolation openings 240 and on the side of the first electrode layer 400 away from the array substrate 100. The lapping functional layer 500 includes a conductive portion 510 and a light-transmitting portion 520. There is a gap 530 between at least a part of the light-transmitting portion 520 and the isolation structure 200, and at least a part of the conductive portion 510 is located in the gap 530 and is in contact connection with the isolation structure 200.

[0068] For the display panel 10 according to the embodiment of the present application, the display panel 10 includes an array substrate 100, an isolation structure 200, a light-emitting layer 300, a first electrode layer 400, and a lapping functional layer 500. The isolation structure 200 is disposed on the array substrate 100 and encloses to form a plurality of isolation openings 240 to partition the light-emitting layer 300 to form mutually disconnected light-emitting units 310, thereby reducing the crosstalk of carriers in the light-emitting layer 300, improving the display effect of the display panel 10, and preparing the light-emitting units 310 without using a precision mask plate, which can reduce the development and use of the precision mask plate and reduce the manufacturing cost. The first electrode layer 400 is partitioned to form mutually spaced first electrodes 410, and each first electrode 410 is electrically connected to each other through the isolation structure 200 to form a full-surface electrode. The lapping functional layer 500 includes a conductive portion 510 and a light-transmitting portion 520. The setting of the light-transmitting portion 520 can reduce the distribution area of the conductive portion 510 to reduce the light shielding of the conductive portion 510 to the light-emitting units 310. There is a gap 530 between the light-transmitting portion 520 and the isolation structure 200 to set the conductive portion 510. The conductive portion 510 is electrically connected to the isolation structure 200, thereby improving the lapping effect between the first electrode 410 and the isolation structure 200, reducing the contact resistance between the first electrode 410 and the isolation structure 200, and improving the service performance of the display panel 10. There are also various setting methods for the array substrate 100. For example, the array substrate 100 may include a substrate and a driving circuit layer disposed on the substrate. Or the array substrate 100 includes a buffer layer and a support plate on the side away from the substrate, etc.

[0069] In some alternative embodiments, the gap 530 is located on the peripheral side of the light-transmitting portion 520, and the conductive portion 510 is arranged in a ring around the light-transmitting portion 520.

[0070] In these alternative embodiments, the conductive portion 510 is arranged in a ring around the light-transmitting portion 520, increasing the contact area between the conductive portion 510 and the isolation structure 200, improving the overlapping effect between the conductive portion 510 and the isolation structure 200 and reducing the contact resistance between the conductive portion 510 and the isolation structure 200, thereby reducing the power consumption of the display panel 10.

[0071] Optionally, the light-transmitting portion 520 includes an organic material, such as a cathode patterning material, and the conductive portion 510 includes a metal conductive material, such as silver or a magnesium-silver alloy. When the light-transmitting portion 520 is a cathode patterning material (CPM), when the conductive portion 510 of the metal material is re-evaporated, the conductive portion 510 will avoid evaporating on the CPM and evaporate to the position where the CPM is not present, that is, into the gap 530, so as to overlap with the isolation structure 200.

[0072] In some alternative embodiments, the thickness of the conductive portion 510 is greater than or equal to the thickness of the light-transmitting portion 520.

[0073] In these alternative embodiments, when the conductive portion 510 can avoid evaporating on the CPM, the conductive portion 510 evaporates into the gap 530. And when the thickness of the conductive portion 510 is greater than or equal to the thickness of the light-transmitting portion 520, the space of the gap 530 can be fully utilized, the thickness of the conductive portion 510 can be increased to reduce the resistance of the conductive portion 510. And the thickness of the conductive portion 510 is relatively large, the overlapping effect between it and the isolation structure 200 is better, and the contact area between the conductive portion 510 and the isolation structure 200 is relatively large, reducing the contact resistance between the conductive portion 510 and the isolation structure 200, thereby reducing the overall power consumption of the display panel 10 and improving the performance of the display panel 10.

[0074] In some alternative embodiments, the thickness of the conductive portion 510 is 10 nm to 1000 nm.

[0075] In these alternative embodiments, when the thickness of the conductive portion 510 is greater than or equal to 10 nm, the problem that the overlapping effect between the conductive portion 510 and the isolation structure 200 is poor due to the too small thickness of the conductive portion 510 can be improved. When the thickness of the conductive portion 510 is less than or equal to 1000 nm, the problems that the conductive portion 510 consumes too much material, has a high cost and a large preparation difficulty due to the too large thickness of the conductive portion 510 can be avoided.

[0076] In some alternative embodiments, the thickness of the light-transmitting portion 520 is 10 nm to 100 nm.

[0077] In these alternative embodiments, when the thickness of the light-transmitting portion 520 is greater than or equal to 10 nm, it is possible to improve the problem that due to the too small thickness of the light-transmitting portion 520, the depth of the gap 530 formed between the light-transmitting portion 520 and the isolation structure 200 is too shallow, and the portion of the conductive portion 510 located in the gap 530 is small, resulting in poor structural stability and thus poor overlapping effect with the isolation structure 200. When the thickness of the light-transmitting portion 520 is less than or equal to 100 nm, it is possible to avoid the problem that due to the too large thickness of the light-transmitting portion 520, the consumption of the light-transmitting portion 520 is large and the cost is high.

[0078] Please refer to Figure 3 , Figure 3 which is a partial cross-sectional view of the display panel in another embodiment.

[0079] As Figure 3 shown, optionally, the display panel 10 further includes a light extraction layer 600. The light extraction layer 600 is located on the side of the overlapping functional layer 500 away from the array substrate 100. The light extraction layer 600 can reduce the total reflection effect in the display panel 10, thereby improving the light extraction rate of the display panel 10.

[0080] Please refer to Figure 4 , Figure 4 which is a partial cross-sectional view of the display panel in yet another embodiment.

[0081] As Figure 4 shown, in some alternative embodiments, the light extraction layer 600 includes a first refractive layer 610 and a second refractive layer 620. The second refractive layer 620 is located on the side of the first refractive layer 610 away from the array substrate 100. The refractive index of the first refractive layer 610 is greater than that of the second refractive layer 620.

[0082] In these alternative embodiments, the refractive index of the first refractive layer 610 is greater than that of the second refractive layer 620, so that the light emitted by the light-emitting unit 310 can be deflected toward the light-emitting surface of the display panel 10, thereby causing the light to converge and achieving an improvement in forward light emission, which is beneficial to improving the display effect of the display panel 10.

[0083] Optionally, the difference between the refractive index of the first refractive layer 610 and the refractive index of the second refractive layer 620 is greater than or equal to 0.4, so that the first refractive layer 610 and the second refractive layer 620 form a distributed Bragg reflection (DBR) cavity, which can reduce the reflection of light within a certain wavelength range, thereby selectively enhancing the light of a specific wavelength and achieving an improvement in forward light emission.

[0084] Optionally, the refractive index of the first refractive layer 610 is greater than that of the light transmissive portion 520, so that the light emitted by the light emitting unit 310 can be deflected toward the light emitting surface of the display panel 10 at the interface between the first refractive layer 610 and the light transmissive portion 520, thereby causing the light to converge and achieving an improvement in forward light emission, which is beneficial to improving the display effect of the display panel 10.

[0085] Please refer to Figure 5 , Figure 5 which is a partial cross-sectional view of the display panel in yet another embodiment.

[0086] As Figure 5 shown, in some alternative embodiments, the light emitting unit 310 includes a red light emitting unit 311, a green light emitting unit 312, and a blue light emitting unit 313, the light extraction layer 600 includes a first light extraction portion 601, a second light extraction portion 602, and a third light extraction portion 603, the first light extraction portion 601 and the red light emitting unit 311 are correspondingly arranged, the second light extraction portion 602 and the green light emitting unit 312 are correspondingly arranged, the third light extraction portion 603 and the blue light emitting unit 313 are correspondingly arranged, wherein the thickness of the first light extraction portion 601 is greater than the thickness of the second light extraction portion 602, and / or the thickness of the second light extraction portion 602 is greater than the thickness of the third light extraction portion 603.

[0087] The corresponding arrangement of the first light extraction portion 601 and the red light emitting unit 311 means that the orthographic projection of the first light extraction portion 601 on the array substrate 100 and the orthographic projection of the red light emitting unit 311 on the array substrate 100 at least partially overlap. The corresponding arrangement of the second light extraction portion 602 and the green light emitting unit 312 means that the orthographic projection of the second light extraction portion 602 on the array substrate 100 and the orthographic projection of the green light emitting unit 312 on the array substrate 100 at least partially overlap. The corresponding arrangement of the third light extraction portion 603 and the blue light emitting unit 313 means that the orthographic projection of the third light extraction portion 603 on the array substrate 100 and the orthographic projection of the blue light emitting unit 313 on the array substrate 100 at least partially overlap.

[0088] In these alternative embodiments, the thickness of the first light extraction portion 601 is greater than that of the second light extraction portion 602, which can improve the light extraction efficiency of the corresponding red light-emitting unit 311. The thickness of the second light extraction portion 602 is greater than that of the third light extraction portion 603, which can improve the light extraction efficiency of the corresponding green light-emitting unit 312. By providing light extraction layers 600 with different thicknesses corresponding to light-emitting units 310 of different colors, and different thicknesses of the light extraction layers corresponding to different wavelength ranges of enhanced light, such that the wavelength of red light is within the wavelength range of the enhanced light corresponding to the first light extraction portion 601, the wavelength of green light is within the wavelength range of the enhanced light corresponding to the second light extraction portion 602, and the wavelength of blue light is within the wavelength range of the enhanced light corresponding to the third light extraction portion 603, thereby improving the light extraction efficiency of each light-emitting unit 310 and enhancing the overall display effect of the display panel 10.

[0089] In some alternative embodiments, the isolation structure 200 includes a first conductive layer 210 and a second layer 220 located on a side of the first conductive layer 210 facing away from the array substrate 100. The orthographic projection of the first conductive layer 210 on the array substrate 100 is within the orthographic projection of the second layer 220 on the array substrate 100.

[0090] In these alternative embodiments, the first conductive layer 210 and the second layer 220 are provided to form the isolation structure 200. The orthographic projection of the first conductive layer 210 disposed close to the array substrate 100 on the array substrate 100 is within the orthographic projection of the second layer 220 on the array substrate 100. The area of the second layer 220 is larger than that of the first conductive layer 210. The second layer 220 covers the surface of the first conductive layer 210 close to the second layer 220. At this time, the first conductive layer 210 is recessed relative to the second layer 220 in a direction away from the isolation opening 240. When preparing the light-emitting layer 300, a large drop occurs at the edge of the isolation structure 200, and the first conductive layer 210 is recessed inward relative to the second layer 220, making it difficult for the light-emitting layer 300 to connect at the edge of the isolation structure 200, thereby causing a break, and the light-emitting layer 300 breaks to form mutually disconnected light-emitting units 310.

[0091] In some alternative embodiments, the second layer 220 includes a conductive material or an insulating material.

[0092] In these alternative embodiments, the second layer 220 includes a conductive material. For example, the second layer 220 includes a non-metallic conductive material or a metallic conductive material. When the second layer 220 is a non-metallic conductive material or an insulating material, it is difficult to etch the second layer 220 during the wet etching of the first conductive layer 210 using an etching solution, thereby making it easier for the first conductive layer 210 to be recessed inward relative to the second layer 220.

[0093] In some alternative embodiments, the second layer 220 comprises a metallic material, and the materials of the first conductive layer 210 and the second layer 220 are different.

[0094] In these alternative embodiments, when both the first conductive layer 210 and the second layer 220 are metallic materials, a wet etching process can be used to etch the first conductive layer 210 with an etching solution. By setting the etching solution, the etching rate of the second layer 220 can be made less than that of the first conductive layer 210. Since the etching rate of the first conductive layer 210 is higher, when wet etching is performed with the etching solution, even though the second layer 220 will be etched to some extent, the first conductive layer 210 is etched faster, such that the first conductive layer 210 is recessed relative to the second layer 220.

[0095] Optionally, the first electrode 410 is electrically connected to the first conductive layer 210, such that adjacent first electrodes 410 are electrically connected through the first conductive layer 210, thereby forming a full-surface electrode.

[0096] Optionally, the conductive portion 510 is electrically connected to the first conductive layer 210. Since the first electrode 410 is in contact connection with the conductive portion 510, the first electrode 410 can be electrically connected to the first conductive layer 210 through the conductive portion 510, improving the overlapping effect between the first electrode 410 and the first conductive layer 210.

[0097] Please refer to Figure 5 and Figure 6 , Figure 6 which is a partial cross-sectional view of a display panel in yet another embodiment.

[0098] As Figure 5 and Figure 6 shown, in some alternative embodiments, the isolation structure 200 further comprises a third layer 230 on the side of the first conductive layer 210 facing the array substrate 100, and the orthographic projection of the first conductive layer 210 on the array substrate 100 is within the orthographic projection of the third layer 230 on the array substrate 100.

[0099] In these alternative embodiments, in order to obtain the recessed first conductive layer 210, during the etching process, the first conductive layer 210 has a higher etching rate relative to the second layer 220 and the third layer 230, thereby forming a recessed first conductive layer 210. Since the etching rate of the first conductive layer 210 is higher, more etching waste is generated and is likely to enter other positions of the display panel 10, thus causing adverse effects. After the third layer 230 is provided, the first conductive layer 210 can be better attached to the third layer 230, and the generated etching waste falls on the third layer 230, facilitating cleaning.

[0100] Optionally, the material of the second layer 220 is titanium (Ti), the material of the first conductive layer 210 is aluminum (Al), and the material of the third layer 230 is titanium (Ti) or molybdenum (Mo). That is, the isolation structure 200 is a three-layer metal composite material of Ti / Al / Ti (titanium / aluminum / titanium) or Ti / Al / Mo (titanium / aluminum / molybdenum).

[0101] As Figure 5 shown, optionally, the first electrode 410 is connected to both the first conductive layer 210 and the third layer 230, increasing the contact area between the first electrode 410 and the isolation structure 200, and further improving the lamination success rate between the first electrode 410 and the isolation structure 200.

[0102] Please refer to Figure 7 , Figure 7 which is a partial cross-sectional view of the display panel in yet another embodiment.

[0103] As Figure 7 shown, in some alternative embodiments, the distance between the surface of the light extraction layer 600 facing away from the array substrate 100 and the array substrate 100 is a first distance D1, and the distance between the surface of the second layer 220 close to the array substrate 100 and the array substrate 100 is a second distance D2. The first distance D1 is less than or equal to the second distance D2.

[0104] In these alternative embodiments, the first distance D1 is less than or equal to the second distance D2, that is, the light extraction layer 600 is lower than or flush with the surface of the second layer 220 close to the array substrate 100, avoiding the problem that when the first distance D1 is greater than the second distance D2, it is difficult to deposit the encapsulation layer into the isolation opening 240, resulting in a reduction in the encapsulation performance of the light-emitting layer 300 and the first electrode layer 400.

[0105] In some alternative embodiments, the display panel 10 further includes a pixel definition layer 700. The pixel definition layer 700 is located on the array substrate 100. The pixel definition layer 700 includes pixel defining portions 710 and pixel openings 720 formed by surrounding the pixel defining portions 710. At least part of the light-emitting units 310 are located in the pixel openings 720, and the pixel openings 720 communicate with the isolation openings 240.

[0106] In these alternative embodiments, the pixel defining portions 710 of the pixel definition layer 700 surround to form pixel openings 720 to set the light-emitting units 310 and enable the normal light emission of the light-emitting units 310. And the pixel defining portions 710 define the setting areas of the respective light-emitting units 310, reducing color crosstalk defects between the respective light-emitting units 310. The pixel openings 720 communicate with the isolation openings 240, so that the pixel openings 720 are exposed by the isolation openings 240, that is, the influence of the isolation structure on the light extraction of the light-emitting units 310 can be reduced, ensuring the display effect of the display panel 10.

[0107] In some alternative embodiments, the isolation structure 200 is located on the side of the pixel defining portion 710 away from the array substrate 100.

[0108] In these alternative embodiments, the isolation structure 200 is disposed on the pixel defining portion 710, and the isolation structure 200 has a relatively large height difference with respect to the pixel opening 720. When preparing the light-emitting layer 300, due to the large height difference, the light-emitting layer 300 is more likely to break at the position of the isolation structure 200, reducing the preparation difficulty of the light-emitting layer 300.

[0109] Optionally, the display panel 10 further includes a pixel electrode 730, and the pixel electrode 730 is exposed through the pixel opening 720. One of the pixel electrode 730 and the first electrode 410 serves as the anode of the light-emitting unit 310, and the other serves as the cathode of the light-emitting unit 310. In the embodiments of the present application, an example is given in which the pixel electrode 730 serves as the anode of the light-emitting unit 310 and the first electrode 410 serves as the cathode of the light-emitting unit 310.

[0110] Please refer to Figure 8 , Figure 8 which is a partial cross-sectional view of the display panel in still another embodiment.

[0111] As Figure 8 shown, in some alternative embodiments, a receiving opening 740 is formed in the pixel defining portion, and the isolation structure 200 is located in the receiving opening 740.

[0112] In these alternative embodiments, the isolation structure 200 is disposed in the receiving opening 740 formed in the pixel defining portion. During the preparation process, the preparation step of the isolation structure 200 is before the preparation of the pixel electrode 730, that is, after the isolation structure 200 is prepared on the array substrate 100, the pixel electrode 730 is then prepared on the array substrate 100, so as to reduce the influence of the preparation of the isolation structure 200 on the pixel electrode 730 and ensure that the pixel electrode 730 is not damaged.

[0113] Optionally, the pixel electrode 730 includes a main body portion exposed through the pixel opening 720. The orthographic projection of the main body portion on the array substrate 100 is located within the orthographic projection of the light-transmitting portion 520 on the array substrate 100. The corresponding area of the main body portion is the effective light-emitting area of the light-emitting unit 310, and the light emitted by the light-emitting unit 310 can all pass through the light-transmitting portion 520, improving the light extraction rate of the display panel 10.

[0114] Optionally, the light-emitting layer 300 includes an electron injection layer (EIL), an electron transport layer (ETL), a light-emitting material layer, a hole injection layer (HIL), and a hole transport layer (HTL).

[0115] The structural design in this embodiment can be applied to other display panels 10, and the specific selection can be made according to the actual situation. This application does not impose any specific restrictions on it.

[0116] The embodiment of the second aspect of the present application also provides a display device, including the display panel 10 of any of the above-mentioned first aspect embodiments. Since the display device provided by the embodiment of the second aspect of the present application includes the display panel 10 of any of the above-mentioned first aspect embodiments, the display device provided by the embodiment of the second aspect of the present application has the beneficial effects of the display panel 10 of any of the above-mentioned first aspect embodiments, which will not be described in detail here.

[0117] The display device in the embodiment of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart fixed-line phones, consoles and other devices with display functions.

[0118] Please refer to Figure 9 , Figure 9 This is a schematic diagram of a method for preparing a display panel provided in an embodiment of the present application.

[0119] The third aspect of the present application also provides a method for preparing a display panel 10. The display panel 10 may be any of the above-mentioned first aspect embodiments. Please refer to Figures 1 to 8 , the preparation method comprises:

[0120] Step S01: Prepare an isolation structure on the array substrate, the isolation structure encloses a plurality of isolation openings.

[0121] Step S02: preparing a light-emitting layer on the array substrate, the light-emitting layer comprising light-emitting units located in the isolation openings.

[0122] Step S03: Prepare a first electrode layer on the side of the light-emitting layer away from the array substrate. The first electrode layer is arranged in the isolation opening and includes a plurality of first electrodes. The first electrodes are electrically connected to the isolation structure.

[0123] Step S04: Prepare an overlapping functional layer on the side of the first electrode layer away from the array substrate. The overlapping functional layer is arranged in the isolation opening and includes a conductive portion and a light-transmitting portion. There is a gap between at least part of the light-transmitting portion and the isolation structure. At least part of the conductive portion is located in the gap and is in contact with the isolation structure.

[0124] According to the preparation method of the third aspect embodiment of the present application, the isolation structure 200 is prepared through step S01, and the isolation structure 200 encloses to form a plurality of isolation openings 240. The light-emitting layer 300 is prepared through step S02, and the light-emitting layer 300 includes light-emitting units 310 located in the isolation openings 240. The isolation structure 200 is disposed on the array substrate 100 and encloses to form a plurality of isolation openings 240 to partition the light-emitting layer 300 into mutually disconnected light-emitting units 310, thereby reducing the crosstalk of carriers in the light-emitting layer 300, improving the display effect of the display panel 10, and the preparation of the light-emitting units 310 does not require a precision mask plate, which can reduce the development and use of the precision mask plate and lower the preparation cost. The first electrode layer 400 is prepared through step S03, and the first electrode layer 400 is partitioned into mutually spaced first electrodes 410, and each first electrode 410 is electrically connected to each other through the isolation structure 200 to form a whole-surface electrode. Finally, the overlapping functional layer 500 is prepared through step S04, and the overlapping functional layer 500 includes a conductive portion 510 and a light-transmitting portion 520. The setting of the light-transmitting portion 520 can reduce the distribution area of the conductive portion 510 to reduce the light shielding of the conductive portion 510 to the light-emitting units 310. There is a gap 530 between the light-transmitting portion 520 and the isolation structure 200 to set the conductive portion 510, and the conductive portion 510 is electrically connected to the isolation structure 200, thereby improving the overlapping effect between the first electrode 410 and the isolation structure 200, reducing the contact resistance between the first electrode 410 and the isolation structure 200, and improving the service performance of the display panel 10.

[0125] In some alternative embodiments, the light-transmitting portion 520 includes a cathode patterning material, and the conductive portion 510 includes a metal conductive material. In step S04, the method further includes:

[0126] Using a precision mask plate to prepare the light-transmitting portion 520 on the side of the first electrode layer 400 facing away from the array substrate 100, and there is a gap 530 between at least a part of the light-transmitting portion 520 and the isolation structure 200;

[0127] Using a general mask plate to prepare the conductive portion 510 on the side of the light-transmitting portion 520 facing away from the array substrate 100, and at least a part of the conductive portion 510 is located in the gap 530 and is in contact connection with the isolation structure 200.

[0128] In these alternative embodiments, since the light-transmitting portion 520 needs to be evaporated into the isolation opening 240 and a gap 530 is formed at an interval from the isolation structure 200, the preparation accuracy is relatively high. Therefore, a precision mask is used to evaporate the light-transmitting portion 520. When the light-transmitting portion 520 is a cathode patterning material, when the conductive portion 510 of the metal material is evaporated, the conductive portion 510 will avoid evaporating on the CPM and thus be evaporated to a position where the CPM is not present, that is, into the gap 530, so as to overlap with the isolation structure 200. Therefore, there is no need to control the evaporation accuracy of the conductive portion 510, and a general mask can be used for evaporation.

[0129] According to the embodiments of the present application as described above, these embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and its modifications based on the present application. The present application is only limited by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: The display panel comprises: An array substrate; An isolation structure, located on the array substrate, the isolation structure encloses a plurality of isolation openings; A light-emitting layer, located on the array substrate, wherein the light-emitting layer includes light-emitting units located in the isolation openings; A first electrode layer, disposed in the isolation opening and located at a side of the light-emitting unit away from the array substrate, the first electrode layer comprising a plurality of first electrodes, and the first electrodes are electrically connected to the isolation structure; The overlapping functional layer is arranged in the isolation opening and located on the side of the first electrode layer away from the array substrate. The overlapping functional layer includes a conductive part and a light-transmitting part. There is a gap between at least part of the light-transmitting part and the isolation structure, and at least part of the conductive part is located in the gap and is in contact with the isolation structure.

2. The display panel according to claim 1, characterized in that: The gap is located at the peripheral side of the light-transmitting portion, and the conductive portion is arranged in a ring shape around the light-transmitting portion.

3. The display panel according to claim 1, characterized in that: The light-transmitting portion includes an organic material; Preferably, the organic material is a cathode patterning material; Preferably, the conductive part comprises a metallic conductive material.

4. The display panel according to claim 1, characterized in that: The thickness of the conductive portion is greater than or equal to the thickness of the light-transmitting portion; Preferably, the thickness of the conductive portion is 10 nm to 1000 nm; Preferably, the thickness of the light-transmitting portion is 10 nm to 100 nm.

5. The display panel according to claim 1, characterized in that: The display panel further includes: A light extraction layer, located on a side of the overlapping functional layer away from the array substrate; Preferably, the light extraction layer includes a first refractive layer and a second refractive layer, the second refractive layer is located on a side of the first refractive layer away from the array substrate, and the refractive index of the first refractive layer is greater than the refractive index of the second refractive layer; Preferably, the difference between the refractive index of the first refractive layer and the refractive index of the second refractive layer is greater than or equal to 0.4; Preferably, the refractive index of the first refractive layer is greater than the refractive index of the light-transmitting portion; Preferably, the light-emitting unit includes a red light-emitting unit, a green light-emitting unit and a blue light-emitting unit, the light extraction layer includes a first light extraction portion, a second light extraction portion and a third light extraction portion, the first light extraction portion is arranged correspondingly to the red light-emitting unit, the second light extraction portion is arranged correspondingly to the green light-emitting unit, and the third light extraction portion is arranged correspondingly to the blue light-emitting unit. The thickness of the first light extraction portion is greater than the thickness of the second light extraction portion, and / or the thickness of the second light extraction portion is greater than the thickness of the third light extraction portion.

6. The display panel according to claim 1, characterized in that: The isolation structure comprises a first conductive layer and a second layer located on a side of the first conductive layer away from the array substrate, wherein an orthographic projection of the first conductive layer on the array substrate is located within an orthographic projection of the second layer on the array substrate; Preferably, the second layer comprises a conductive material or an insulating material; Preferably, the second layer comprises a metal material, and the first conductive layer and the second layer are made of different materials; Preferably, the first electrode is electrically connected to the first conductive layer; Preferably, the conductive portion is electrically connected to the first conductive layer; Preferably, the isolation structure further comprises a third layer located on a side of the first conductive layer facing the array substrate, and an orthographic projection of the first conductive layer on the array substrate is located within an orthographic projection of the third layer on the array substrate; Preferably, the first electrode is connected to both the first conductive layer and the third layer; Preferably, the distance between the surface of the light extraction layer facing away from the array substrate and the array substrate is a first distance, the distance between the surface of the second layer close to the array substrate and the array substrate is a second distance, and the first distance is less than or equal to the second distance.

7. The display panel according to claim 1, characterized in that: The display panel further includes: a pixel definition layer, located on the array substrate, the pixel definition layer comprising a pixel definition portion and a pixel opening formed by the pixel definition portion, at least part of the light emitting unit is located in the pixel opening, and the pixel opening is connected to the isolation opening; Preferably, the isolation structure is located on a side of the pixel defining portion away from the array substrate; Preferably, a receiving opening is provided on the pixel defining portion, and the isolation structure is located in the receiving opening; Preferably, the display panel further comprises a pixel electrode, and at least a portion of the pixel electrode is exposed by the pixel opening; Preferably, the pixel electrode comprises a main body portion exposed by the pixel opening, and an orthographic projection of the main body portion on the array substrate is located within an orthographic projection of the light-transmitting portion on the array substrate.

8. A display device, characterized in that: A display panel comprising any one of claims 1 to 7.

9. A method for preparing a display panel, characterized in that: include: Preparing an isolation structure on the array substrate, wherein the isolation structure encloses a plurality of isolation openings; Preparing a light-emitting layer on the array substrate, wherein the light-emitting layer includes light-emitting units located in the isolation openings; A first electrode layer is prepared on a side of the light-emitting layer away from the array substrate, wherein the first electrode layer is disposed in the isolation opening and includes a plurality of first electrodes, and the first electrodes are electrically connected to the isolation structure; A overlapping functional layer is prepared on the side of the first electrode layer facing away from the array substrate. The overlapping functional layer is arranged in the isolation opening and includes a conductive part and a light-transmitting part. There is a gap between at least part of the light-transmitting part and the isolation structure, and at least part of the conductive part is located in the gap and is in contact with and connected to the isolation structure.

10. The preparation method according to claim 9, characterized in that: The light-transmitting portion includes a cathode patterned material, the conductive portion includes a metal conductive material, and in the step of preparing an overlapping functional layer on a side of the first electrode layer away from the array substrate, the method further includes: Using a precision mask to prepare the light-transmitting portion on a side of the first electrode layer away from the array substrate, with a gap between at least part of the light-transmitting portion and the isolation structure; The conductive portion is prepared on a side of the light-transmitting portion away from the array substrate by using a universal mask, and at least a portion of the conductive portion is located in the gap and is in contact with and connected to the isolation structure.

Images