Display panel and display device

Abstract

The utility model discloses a display panel and a display device. The display panel comprises a substrate; the isolation structure is located on one side of the substrate, and a plurality of isolation openings are defined by the isolation structure; at least parts of the light-emitting devices are located in the corresponding isolation openings, each light-emitting device comprises a first electrode, a light-emitting function layer and a second electrode which are sequentially arranged in a stacked mode in the direction away from the substrate, each first electrode comprises at least one warping part, and the at least one warping part extends in the direction away from the substrate; the packaging layer is located on the sides, away from the substrate, of the light emitting devices and the isolation structures, and a plurality of via holes are formed in the packaging layer; and the at least one auxiliary electrode is positioned on one side, far away from the substrate, of the packaging layer, and is connected with the plurality of second electrodes of the plurality of light-emitting devices through the plurality of via holes. According to the application, the orthographic projection of the warping part on the substrate is arranged in the orthographic projection of the isolation structure on the substrate, so that the difficulty of water and oxygen invasion can be improved, and the warping part of the first electrode is further protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] An organic light-emitting diode (OLED) is an organic thin-film electroluminescent device. In the process of manufacturing an OLED display device, in order to increase the display efficiency, the pixels are usually connected in series to form a tandem OLED structure.

[0003] However, since the isolation structure between the pixels is not conductive, an auxiliary second electrode is usually needed to connect the second electrodes of adjacent pixels. The auxiliary second electrode needs to be opened on the encapsulation layer outside the pixel second electrode, which leads to the problem of water and oxygen intrusion, affecting the light emission of the OLED display device.

[0004] In some display panels, an auxiliary electrode technology is introduced to improve its performance. Patent CN118742138A, PCT / CN2024 / 107011, 202411175069.8 describe the related content of the auxiliary electrode technology, for reference. UTILITY MODEL CONTENT

[0005] Therefore, the present application provides a display panel and a display device to solve the problem of water and oxygen intrusion in the conventional solution.

[0006] The first aspect of the present application provides a display panel, comprising: a substrate; an isolation structure located on one side of the substrate, the isolation structure defining a plurality of isolation openings; a plurality of light-emitting devices, at least part of the light-emitting devices being located in the corresponding isolation openings, the light-emitting device comprising a first electrode, a light-emitting functional layer and a second electrode which are sequentially stacked in a direction away from the substrate, the first electrode comprising at least one warping portion, the at least one warping portion extending in a direction away from the substrate; an encapsulation layer located on the side of the plurality of light-emitting devices and the isolation structure away from the substrate, the encapsulation layer having a plurality of vias; at least one auxiliary electrode located on the side of the encapsulation layer away from the substrate and connected to a plurality of the second electrodes of the plurality of light-emitting devices through the plurality of vias; wherein at least part of the orthographic projection of the at least one warping portion on the substrate is located within the orthographic projection of the isolation structure on the substrate.

[0007] Optionally, at least part of the orthographic projection of the at least one warping portion on the substrate is located outside the orthographic projection of the corresponding via on the substrate.

[0008] Optionally, the first electrode further includes a main body portion integrally connected to the at least one warped portion, wherein: the orthographic projection of the isolation opening on the substrate is located within the orthographic projection of the corresponding main body portion on the substrate, and / or, the orthographic projection of the via on the substrate is located within the orthographic projection of the corresponding main body portion on the substrate.

[0009] Optionally, the isolation structure includes a support portion and a blocking portion stacked sequentially in a direction away from the substrate, wherein the orthographic projection of the side of the support portion near the blocking portion on the substrate is located within the orthographic projection of the blocking portion on the substrate, and the at least one warped portion includes an edge away from the main body portion, wherein the orthographic projection of the edge on the substrate is located within the orthographic projection of the support portion on the substrate.

[0010] Optionally, the isolation structure further includes a bottom portion disposed on the side of the support portion near the substrate, wherein the orthographic projection of the side of the support portion near the bottom portion on the substrate is located within the orthographic projection of the bottom portion on the substrate, wherein: at least a portion of the orthographic projections of the plurality of vias on the substrate do not coincide with the orthographic projection of the bottom portion on the substrate, and / or, at least a portion of the orthographic projections of the plurality of vias on the substrate do not coincide with the orthographic projection of the blocking portion on the substrate.

[0011] Optionally, the display panel further includes: a pixel definition layer located on one side of the substrate, the pixel definition layer including a plurality of pixel openings, the pixel openings communicating with corresponding isolation openings, the isolation structure located on the side of the pixel definition layer away from the substrate, and the orthographic projection of the isolation structure on the substrate being within the orthographic projection of the pixel definition layer on the substrate; wherein, the thickness range of the pixel definition layer is [30nm, 1um], and the thickness range of the isolation structure is [300nm, 1um].

[0012] Optionally, the bottom material includes silicon oxide and / or metal, the support material includes silicon nitride, and the blocking material includes silicon oxide.

[0013] Optionally, the at least one auxiliary electrode includes a first layer, a second layer, and a third layer stacked sequentially in a direction away from the substrate. The first layer and the third layer are made of molybdenum, the second layer is made of aluminum, and the thickness of the at least one auxiliary electrode is in the range of [2000 Å, 6000 Å].

[0014] Optionally, the encapsulation layer includes: a plurality of encapsulation portions, the encapsulation portions being disposed on the side of the corresponding light-emitting device away from the substrate and extending along the sidewall of the isolation structure to the side of the isolation structure away from the substrate; wherein, the vias are disposed on the corresponding encapsulation portions, and the material of the encapsulation layer includes polytetrafluoroethylene.

[0015] A second aspect of this application provides a display device including a display panel as described in the first aspect of the embodiment.

[0016] This application protects the warped portion of the first electrode by setting the orthogonal projection of the warped portion of the first electrode onto the substrate within the orthogonal projection of the isolation structure onto the substrate. In this case, even if water or oxygen intrudes through the vias in the encapsulation layer, the intruding water or oxygen needs to travel a long path to reach the warped portion of the first electrode. It only reaches the location outside the warped portion of the first electrode and will not cause any impact, thereby protecting the warped portion of the first electrode. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of a display panel according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of a display panel according to another embodiment of this application;

[0020] Figure 3 This is a schematic diagram of a display panel including a pixel definition layer according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of a display panel including a pixel definition layer, according to another embodiment of this application.

[0022] In the figure: 1 substrate; 2 isolation structure; 21 bottom; 22 support; 23 blocking; 3 light-emitting device; 31 first electrode; 32 light-emitting functional layer; 33 second electrode; 4 encapsulation layer; 5 auxiliary electrode; 6 pixel definition layer. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0024] Figure 1 This is a schematic diagram of a display panel according to an embodiment of this application. Figure 1 As shown, the display panel includes:

[0025] A substrate 1 and an isolation structure 2 are located on one side of the substrate, with the isolation structure 2 defining multiple isolation openings. Multiple light-emitting devices 3 are present, with at least a portion of each device located within a corresponding isolation opening. Each light-emitting device 3 includes a first electrode 31, a light-emitting functional layer 32, and a second electrode 33 sequentially stacked along a direction away from the substrate 1. The first electrode 31 includes at least one warped portion extending along a direction away from the substrate 1. An encapsulation layer 4 is located on the side of the multiple light-emitting devices 3 and the isolation structure 2 away from the substrate 1, and multiple vias are provided on the encapsulation layer 4. At least one auxiliary electrode 5 is located on the side of the encapsulation layer 4 away from the substrate 1 and is connected to the multiple second electrodes 33 of the multiple light-emitting devices 3 through the multiple vias. At least a portion of the orthographic projection of the at least one warped portion onto the substrate 1 is located within the orthographic projection of the isolation structure 2 onto the substrate.

[0026] The display panel includes a substrate 1, an isolation structure 2, and multiple light-emitting devices 3. Each of the multiple light-emitting devices 3 can emit one of R (red), G (green), and B (blue) light. The light-emitting device 3 emits light of the corresponding color through its included light-emitting functional layer 32. The isolation structure 2 isolates the light-emitting functional layers 32 of adjacent light-emitting devices 3, defining multiple isolation openings. When forming the light-emitting device 3, the light-emitting device 3 is confined within the isolation openings to fix the light-emitting position of the light-emitting functional layer 32. However, due to the isolation of multiple isolation structures 2, adjacent light-emitting functional layers 32 cannot be connected in series. Therefore, multiple vias need to be opened on the encapsulation layer 4 to expose part of the second electrode 33, and then the second electrodes 33 of adjacent light-emitting functional layers 32 are electrically connected through auxiliary electrodes 5. Meanwhile, to avoid the impact of water and oxygen intrusion, the warped portion of the first electrode 31 is positioned below the isolation structure 2. That is, at least a portion of the orthographic projection of the warped portion of the first electrode 31 onto the substrate 1 is located within the orthographic projection of the isolation structure 2 onto the substrate 1. In this case, even if water and oxygen intrusion occurs through the via, the intruding water and oxygen need to travel a longer path to reach the warped portion of the first electrode 31. It only reaches the position outside the warped portion of the first electrode 31 and will not cause any impact, thereby protecting the warped portion of the first electrode.

[0027] Specifically, at least a portion of the orthographic projection of at least one warped portion on the substrate is located outside the orthographic projection of the corresponding via on the substrate. By ensuring that at least a portion of the orthographic projection of the warped portion on the substrate is located outside the orthographic projection of the corresponding via on the substrate, it is possible to prevent the moisture intrusion path from being too short.

[0028] Specifically, the first electrode 31 also includes a main body portion, which is integrally connected to at least one warped portion, wherein: the orthographic projection of the isolation opening on the substrate 1 lies within the orthographic projection of the corresponding main body portion on the substrate 1, and / or, the orthographic projection of the via on the substrate 1 lies within the orthographic projection of the corresponding main body portion on the substrate 1. When the orthographic projection of the via on the substrate 1 lies within the orthographic projection of the corresponding main body portion on the substrate 1, the shortest path for moisture intrusion points to the main body portion, and the main body portion is not affected by moisture intrusion, thereby preventing a short circuit.

[0029] Specifically, at least one auxiliary electrode 5 includes a first layer, a second layer, and a third layer stacked sequentially in a direction away from the substrate 1. The first and third layers are made of molybdenum, the second layer is made of aluminum, and the thickness of at least one auxiliary electrode is in the range of [2000 Å, 6000 Å].

[0030] The auxiliary electrode 5 can be a molybdenum nitride layer / molybdenum layer, an aluminum layer and a molybdenum layer stacked sequentially to form a molybdenum-aluminum-molybdenum composite film. When the auxiliary electrode 5 is a molybdenum-aluminum-molybdenum composite film, the auxiliary electrode 5 has strong contact force, good glass surface uniformity, and strong light reflection in the visible light range.

[0031] Specifically, the encapsulation layer 4 includes: multiple encapsulation portions, which are disposed on the side of the corresponding light-emitting device 3 away from the substrate 1 and extend along the sidewall of the isolation structure 2 to the side of the isolation structure 2 away from the substrate 1; wherein, vias are disposed on the corresponding encapsulation portions, and the material of the encapsulation layer 4 includes polytetrafluoroethylene.

[0032] When the encapsulation layer 4 is a polytetrafluoroethylene layer, it has high insulation, corrosion resistance and non-adhesion, and can protect the substrate 1, the isolation structure and the display functional layer.

[0033] like Figure 2 As shown, the warped portion can be positioned directly below the isolation structure 2, thereby increasing the path for water and oxygen intrusion.

[0034] Figure 3 This is a schematic diagram of a display panel according to another embodiment of this application, as shown below. Figure 3As shown, the display panel also includes: a pixel definition layer 6, located on one side of the substrate 1. The pixel definition layer 6 includes multiple pixel openings, which communicate with corresponding isolation openings. An isolation structure 2 is located on the side of the pixel definition layer 6 away from the substrate 1, and the orthographic projection of the isolation structure 2 on the substrate 1 is within the orthographic projection of the pixel definition layer 6 on the substrate 1. The thickness of the pixel definition layer 6 ranges from [30nm to 1um], and the thickness of the isolation structure 2 ranges from [300nm to 1um]. By setting the thickness of the isolation structure 2 to [300nm to 1um], protection of the warped portion of the first electrode 31 can be ensured while controlling production costs. Furthermore, the isolation structure 2 may include multiple isolation pillars, and the length of the orthographic projection of the isolation pillars on the substrate 1 along the extension direction of the substrate 1 can be set to [2um to 20um], which can ensure the isolation pillars are stable while minimizing their obstruction of the light-emitting functional layer 32.

[0035] Specifically, the material of the pixel definition layer 6 includes at least one inorganic material, and the thickness of the pixel definition layer 6 ranges from [30nm, 1um].

[0036] By setting the material of the pixel definition layer 6 to include at least one inorganic material, the corrosion resistance and chemical stability of the pixel definition layer 6 can be improved, which can further protect the light-emitting device 3.

[0037] In this embodiment of the application, by setting the pixel definition layer 6, the light emission range of the light-emitting device 3 can be limited, while the light emission efficiency of the light-emitting device 3 can be improved.

[0038] Figure 4 This is a schematic diagram of a display panel including a pixel definition layer according to another embodiment of this application, as shown below. Figure 4As shown, the isolation structure 2 includes a support portion 22 and a blocking portion 23 stacked sequentially along a direction away from the substrate 1. The orthographic projection of the side of the support portion 22 near the blocking portion 23 on the substrate 1 lies within the orthographic projection of the blocking portion 23 on the substrate 1. At least one warped portion includes an edge away from the main body portion, and the orthographic projection of the edge on the substrate 1 lies within the orthographic projection of the support portion 22 on the substrate. Placing the warped portion of the first electrode 31 below the support portion 22 increases the path length for water and oxygen intrusion into the warped portion, further improving the protection of the warped portion. In addition, the blocking portion 23 of the isolation structure 2 can prevent the light-emitting functional layer 32 in the light-emitting device 3 from being deposited onto the support portion 22 during vapor deposition, thereby improving the stability of the structure. Specifically, the isolation structure 2 also includes a bottom 21 disposed on the side of the support portion 22 near the substrate. The orthographic projection of the side of the support portion 22 near the bottom 21 on the substrate 1 lies within the orthographic projection of the bottom 21 on the substrate 1. Specifically, at least a portion of the orthographic projections of the plurality of vias on the substrate 1 do not coincide with the orthographic projection of the bottom 21 on the substrate 1, and / or, at least a portion of the orthographic projections of the plurality of vias on the substrate 1 do not coincide with the orthographic projection of the blocking portion 23 on the substrate 1. By ensuring that the orthographic projections of at least a portion of the plurality of vias on the substrate 1 do not coincide with the orthographic projections of the bottom 21 or the blocking portion 23 on the substrate 1, the path length for water and oxygen intrusion to the warped portion can be further increased, thereby improving the protection of the warped portion. Furthermore, the bottom 21 and the support portion 22 can limit the position of the light-emitting functional layer 32.

[0039] Specifically, the material of the bottom 21 includes silicon oxide and / or metal, the material of the support 22 includes silicon nitride, and the material of the blocking part 23 includes silicon oxide.

[0040] When the bottom 21 is made of silicon oxide or metal, it has high hardness and can resist wear and scratches. When the support part 22 is made of silicon nitride, it has even higher hardness and insulation, which can prevent leakage caused by electrical connection between adjacent light-emitting devices 3 through the support part 22. When the blocking part 23 is made of silicon oxide, it is lightweight while having high corrosion resistance and chemical stability.

[0041] This application also provides a display device, including the display panel provided in the foregoing embodiments. This display device has the advantages of the display panel in the foregoing embodiments, and therefore will not be described further here.

[0042] It should be noted that the display device can be any device that displays either moving (e.g., video) or stationary (e.g., still image) text or images. More specifically, the intended embodiments can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0043] It should be understood that the specific examples in the embodiments of this application are only for the purpose of helping those skilled in the art to better understand the embodiments of this application, and are not intended to limit the scope of the embodiments of this application. Those skilled in the art can make various improvements and modifications based on the above embodiments, and all such improvements or modifications fall within the protection scope of this application. The above descriptions are merely specific implementations of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; an isolation structure located on one side of the substrate, the isolation structure defining a plurality of isolation openings; a plurality of light-emitting devices, at least part of the light-emitting devices being located in corresponding isolation openings, the light-emitting devices comprising, in sequence from the substrate, a first electrode, a light-emitting functional layer, and a second electrode, the first electrode comprising at least one warped portion extending away from the substrate; an encapsulation layer located on a side of the plurality of light-emitting devices and the isolation structure away from the substrate, the encapsulation layer having a plurality of through holes formed therein; at least one auxiliary electrode located on a side of the encapsulation layer away from the substrate and connected to a plurality of the second electrodes of the plurality of light-emitting devices through the plurality of through holes; wherein at least part of the projection of the at least one warped portion on the substrate is within the projection of the isolation structure on the substrate.

2. The display panel of claim 1, wherein, At least part of the projection of the at least one warped portion on the substrate is outside the projection of the corresponding through hole on the substrate.

3. The display panel of claim 1, wherein, The first electrode further comprises a main body portion integrally connected to the at least one warped portion, wherein: the projection of the isolation opening on the substrate is within the projection of the corresponding main body portion on the substrate, and / or the projection of the through hole on the substrate is within the projection of the corresponding main body portion on the substrate.

4. The display panel of claim 3, wherein, The isolation structure comprises, in sequence from the substrate, a support portion and a barrier portion, the projection of the side of the support portion close to the barrier portion on the substrate is within the projection of the barrier portion on the substrate, the at least one warped portion comprises an edge away from the main body portion, and the projection of the edge on the substrate is within the projection of the support portion on the substrate.

5. The display panel of claim 4, wherein, The isolation structure further comprises a bottom portion provided on the side of the support portion close to the substrate, the projection of the side of the support portion close to the bottom portion on the substrate is within the projection of the bottom portion on the substrate, wherein: at least part of the projection of the plurality of through holes on the substrate does not coincide with the projection of the bottom portion on the substrate, and / or at least part of the projection of the plurality of through holes on the substrate does not coincide with the projection of the barrier portion on the substrate.

6. The display panel of claim 1, wherein, The display panel further comprises: a pixel definition layer located on one side of the substrate, the pixel definition layer comprising a plurality of pixel openings, the pixel openings being in communication with corresponding isolation openings, the isolation structure being located on a side of the pixel definition layer away from the substrate, and the projection of the isolation structure on the substrate being within the projection of the pixel definition layer on the substrate; wherein the thickness of the pixel definition layer ranges from 30 nm to 1 um, and the thickness of the isolation structure ranges from 300 nm to 1 um.

7. The display panel of claim 5, wherein, The material of the bottom portion comprises silicon oxide and / or metal, the material of the support portion comprises silicon nitride, and the material of the barrier portion comprises silicon oxide.

8. The display panel of claim 1, wherein, The at least one auxiliary electrode comprises a first layer, a second layer and a third layer which are sequentially stacked in a direction away from the substrate, the material of the first layer and the third layer comprises molybdenum, the material of the second layer comprises aluminum, and the thickness of the at least one auxiliary electrode ranges from [2000A, 6000A].

9. The display panel of any one of claims 1-8, wherein, The encapsulation layer comprises: A plurality of encapsulation portions, which are arranged on the side of the corresponding light emitting device away from the substrate and extend along the side wall of the isolation structure to the side of the isolation structure away from the substrate; The via is arranged on the corresponding encapsulation portion, and the material of the encapsulation layer comprises polytetrafluoroethylene.

10. A display device, characterized by comprising: The display panel comprises the display panel according to any one of claims 1-9.

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