Display panel

Abstract

The application discloses a display panel, wherein the display panel comprises a substrate, a driving circuit layer arranged on the substrate, a plurality of first electrodes arranged on the driving circuit layer, a pixel definition layer arranged between the plurality of first electrodes on the driving circuit layer, a conductor arranged on the surface of the pixel definition layer, the conductor comprising a first conductor part and a second conductor part, the first conductor part being recessed in the end part of the second conductor part along a second direction, a roof structure arranged on the surface of the conductor away from the pixel definition layer, an organic light-emitting layer arranged in a pixel opening between two adjacent conductors, and a second electrode arranged on the surface of the organic light-emitting layer between two adjacent conductors. Through the above structure, the organic light-emitting layer is separated from the hole injection layer, and the problem of electrical signal crosstalk between two adjacent pixels is solved.

Description

Technical Field

[0001] This utility model relates to the field of display panels, and in particular to display panels. Background Technology

[0002] OLED (Organic Light-Emitting Diode) displays have characteristics such as automatic light emission, wide viewing angle, fast response, small thickness, and high contrast. Therefore, as the next generation of flat panel display devices, organic electroluminescent devices have been widely used in our mobile phones, tablets, and even computer display panels.

[0003] Currently, most OLED organic light-emitting materials are deposited using FMM (Fine Metal Mask) red, green and blue organic light-emitting materials. However, this manufacturing method has the disadvantages of high FMM price and limited resolution, for example, it is already at its limit after reaching 500 PPI.

[0004] To achieve high resolution and color in OLEDs (Organic Light-Emitting Diodes) and better address issues such as low cathode template resolution and low device yield, an isolation structure was introduced in the actual research. This involves fabricating an isolation structure on the substrate before depositing the organic thin film and cathode, instead of using a metal mask during device fabrication. This ultimately separates the different pixels of the device, creating a pixel array. Utility Model Content

[0005] The main technical problem addressed by this application is to provide a display panel that isolates the hole injection layer in the organic light-emitting layer, solves the problem of electrical signal crosstalk between adjacent pixels, improves the reliability of the cathode-conductor connection, ensures stable cathode conduction, and improves display quality.

[0006] To address the aforementioned problems, this application provides a display panel in a first aspect, the display panel comprising: a substrate; a driving circuit stack disposed on the substrate; a plurality of first electrodes disposed at intervals on the driving circuit stack; a pixel definition layer disposed between the plurality of first electrodes on the driving circuit stack; a conductor disposed on the surface of the pixel definition layer, the conductor comprising a first conductor portion and a second conductor portion stacked along a first direction, the first conductor portion being located below the orthographic projection plane of the second conductor portion, and the first conductor portion being recessed inward along a second direction at the end of the second conductor portion; the first direction and the second direction being perpendicular to each other; an eaves structure disposed on the surface of the conductor away from the pixel definition layer; an organic light-emitting layer disposed within a pixel opening between two adjacent conductors and spaced apart from the first conductor portions of the conductors; and a second electrode disposed on the surface of the organic light-emitting layer between two adjacent conductors and communicating with the sidewall of the second conductor portion of the conductor.

[0007] The organic light-emitting layer includes a hole injection layer, which is not in contact with either the first conductor portion or the second conductor portion of the conductor.

[0008] The vertical cross-section of the second conductor portion is a trapezoidal structure that is narrower at the top and wider at the bottom; the vertical cross-section of the first conductor portion includes a trapezoidal structure that is narrower at the top and wider at the bottom, an inverted trapezoidal structure that is wider at the top and narrower at the bottom, and a rectangular structure with equal width at the top and bottom.

[0009] The distance between the end of the second conductor portion and the end of the first conductor portion in the second direction is between 0.1 and 1 μm.

[0010] The height of the first conductor portion along the first direction is between 0.01um and 0.2um.

[0011] Wherein, the area of ​​the eaves structure on the vertical projection plane is greater than the area of ​​the conductor on the vertical projection plane; the distance between the end of the eaves structure extending along the second direction and the end of the conductor extending along the second direction is between 0.4um and 1um.

[0012] The distance between the bottom of the eaves structure and the bottom of the conductor along the first direction is between 0.5um and 1.2um.

[0013] The thickness of the eaves structure along the direction perpendicular to the projection plane is between 0.05um and 3um.

[0014] The conductor comprises a metal or a conductive oxide or a stacked structure formed by a metal and a conductive oxide; the metal includes copper, iron, aluminum, molybdenum, nickel, silver, magnesium, and calcium; the conductive oxide includes indium oxide, tin oxide, and indium tin oxide.

[0015] Wherein, the height of the first conductor portion along the first direction is greater than the height of the hole injection layer, but less than the sum of the thicknesses of the organic light-emitting layer and the second electrode.

[0016] The beneficial effects of this application are: by forming an indented structure at the bottom of the conductor, the partial film layer (hole injection layer) in the organic light-emitting layer is isolated through the indented structure, so that the organic light-emitting layer will never come into contact with the conductor, avoiding the problem of electrical signal crosstalk between adjacent pixels, improving the reliability of the cathode and conductor connection, ensuring the stability of cathode conduction, and improving display quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the display panel provided in this application;

[0019] Figure 2 An enlarged structural schematic diagram of an embodiment of the conductor provided in this application;

[0020] Figure 3 A schematic diagram of the structure of the first embodiment of the conductor provided in this application;

[0021] Figure 4 A schematic diagram of the structure of the second embodiment of the conductor provided in this application;

[0022] Figure 5 A partial structural schematic diagram of an embodiment of the conductor provided in this application;

[0023] Figure 6 This is a partial structural schematic diagram of an embodiment of the display panel provided in this application.

[0024] Substrate 10; driving circuit stack 20; first electrode 30; pixel definition layer 40; conductor 50; roof structure 60; organic light-emitting layer 70; second electrode 80; first conductor portion 111; second conductor portion 112. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0027] It should be understood that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0028] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in every place in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] This application also provides a display panel, please refer to the details. Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the display panel provided in this application. Figure 1 As shown, the display panel includes: a substrate 10, a driving circuit stack 20, a first electrode 30, a pixel definition layer 40, a conductor 50, a roof structure 60, an organic light-emitting layer 70, and a second electrode 80. The first electrode 30 is the pixel anode, and the second electrode 80 is the pixel cathode.

[0032] The conductor 50 includes a first conductor portion 111 and a second conductor portion 112, which are stacked together along a direction perpendicular to the first direction Y. The first conductor portion 111 is located directly below the vertical projection plane of the second conductor portion 112. The first conductor portion is recessed (indented) at the end of the second conductor portion along the second direction. In other words, the extension length of the first conductor portion 111 along the second direction is less than the extension length of the second conductor portion 112 along the second direction, forming a conductor 50 with a recessed structure.

[0033] The first direction Y is defined as the stacking direction or the direction perpendicular to the plane where the substrate 10 is located, and the second direction X is the direction parallel to the plane where the substrate 10 is located.

[0034] Please refer to further details. Figure 2 , Figure 2 This is an enlarged structural schematic diagram of an embodiment of the conductor provided in this application. Figure 2 As shown, the end of the second conductor portion 112 protrudes beyond the end of the first conductor portion 111. That is, the end of the first conductor portion 111 is recessed within the end of the second conductor portion 112. It should be noted that the ends of the first conductor portion 111 and the second conductor portion 112 refer to their outermost edges. In other words, the maximum area of ​​the second conductor portion 112 on the vertical projection plane is greater than the maximum area of ​​the first conductor portion 111 on the vertical projection plane.

[0035] In this embodiment, the second conductor portion 112 has a trapezoidal structure that is narrower at the top and wider at the bottom, so that the bottom of the second conductor portion 112 protrudes from the top and / or bottom of the first conductor portion 111.

[0036] In some embodiments, the first conductor portion 111 may be a trapezoidal structure that is narrower at the top and wider at the bottom, and the length of the bottom of the first conductor portion 111 extending along the second direction X is less than the length of the bottom of the second conductor portion 112 extending along the second direction X. Please refer to [link / reference] for details. Figure 3 , Figure 3 A schematic diagram of the structure of the first embodiment of the conductor provided in this application.

[0037] In other embodiments, the first conductor portion 111 may be an inverted trapezoidal structure that is wider at the top and narrower at the bottom, and the length of the top of the first conductor portion 111 extending along the second direction X is not greater than the length of the bottom of the second conductor portion 112 extending along the second direction X. Please refer to [link / reference] for details. Figure 4 , Figure 4 A schematic diagram of the structure of the second embodiment of the conductor provided in this application.

[0038] In some other embodiments, the first conductor portion 111 can be a rectangular structure with equal width at the top and bottom, and the top and bottom of the first conductor portion 111 extend for the same length along the second direction X. Furthermore, the length of the top or bottom of the first conductor portion 111 extending along the second direction X is less than the length of the bottom of the second conductor portion 112 extending along the second direction X. See also... Figure 2 .

[0039] The first conductor portion 111 is preferably an inverted trapezoidal or rectangular structure, so that the bottom of the first conductor portion 111 is recessed into the bottom of the second conductor portion 112, thereby preventing the hole injection layer located at the bottom of the organic light-emitting layer 70 from overlapping with the first conductor portion 111 in the conductor 50 (i.e., being spaced apart), and thus preventing the hole injection layers on both sides of the conductor 50 from being connected through the conductor, thereby avoiding crosstalk between electrical signals.

[0040] In a preferred embodiment, the distance between the end of the second conductor portion 112 and the end of the first conductor portion 111 in the second direction X is between 0.1 μm and 1 μm, so that the hole injection layer in the subsequently deposited organic light-emitting layer 70 is spaced apart from the conductor 50. By reducing the end of the first conductor portion 111 to between 0.1 μm and 1 μm relative to the end of the second conductor portion 112, the hole injection layer does not contact the bottom of the first conductor portion 111 even when extending towards the first conductor portion 111 of the conductor 50 during evaporation. It should be noted that the end of the second conductor portion 112 refers to the farthest end of the second conductor portion 112 extending in the second direction X; the end of the first conductor portion 111 refers to the farthest end of the first conductor portion 111 extending in the second direction X. Please refer to further details. Figure 5 , Figure 5 This is a partial structural schematic diagram of an embodiment of the conductor provided in this application. Figure 5As shown, the distance between the end of the second conductor portion 112 and the end of the first conductor portion 111 in the second direction is Bx, where 0.1um≤Bx≤1um.

[0041] In a further embodiment, the height / thickness of the first conductor portion 111 along the first direction Y is between 0.01µm and 0.2µm, so that at least the hole injection layer in the subsequently deposited organic light-emitting layer 70 fills the recess formed between the first conductor portion 111 and the second conductor portion 112. That is, the distance between the bottom of the second conductor portion 112 and the bottom of the first conductor portion 111 along the first direction Y is By, 0.01µm ≤ Bx ≤ 0.2µm. The first direction Y is perpendicular to the second direction X; specifically, the first direction Y is a direction perpendicular to the projection plane.

[0042] In a preferred embodiment, the second conductor portion 112 and the first conductor portion 111 are integrally formed, i.e., they are a single structure. The conductor 50 is a metal or a conductive oxide. The metal includes copper, iron, aluminum, molybdenum, nickel, silver, magnesium, calcium, etc. The conductive oxide includes indium oxide, tin oxide, indium tin oxide, etc.

[0043] In some embodiments, the conductor 50 may also have a stacked structure. Specifically, the conductor 50 includes a stacked structure of metals (including a stack of two different metals), a stacked structure of metals and conductive oxides, or a stacked structure of conductive oxides and conductive oxides.

[0044] Specifically, a driving circuit stack 20 is disposed on a substrate 10. A plurality of first electrodes 30 are spaced apart on the driving circuit stack 20. A pixel defining layer 40 is disposed between the plurality of first electrodes 30 on the driving circuit stack 20 to define a pixel opening. A conductor 50 is disposed on the surface of the pixel defining layer 40 away from the driving circuit stack 20. An eaves structure 60 is disposed on the surface of the conductor 50 away from the pixel defining layer 40, and the area of ​​the eaves structure 60 on the vertical projection plane is larger than the area of ​​the conductor 50 on the vertical projection plane. An organic light-emitting layer 70 is disposed within the pixel opening between two adjacent conductors 50. A second electrode 80 is disposed on the surface of the organic light-emitting layer 70 between two adjacent conductors 50 and is connected to the sidewall of the conductor 50.

[0045] The organic light-emitting layer 70 includes a hole injection layer 71, which is located at the bottom layer of the organic light-emitting layer 70, close to the first electrode 30. In this embodiment, the hole injection layer 71 is spaced apart from the sidewall of the conductor 50 by a conductor 50 with a recessed structure. This effectively isolates the hole injection layer 71 in the organic light-emitting layer 70, preventing electrical connection between the hole injection layer 71 and the conductor 50, thereby avoiding the problem of crosstalk between adjacent pixels.

[0046] The hole injection layer 71 extends towards the first conductor portion 111 of the conductor 50. Preferably, the thickness of the hole injection layer 71 is less than the thickness of the first conductor portion 111 of the conductor 50, or less than the height of the recessed structure of the conductor 50, so that the hole injection layer 71 is not connected to the sidewall of the first conductor portion 111, nor to the bottom of the second conductor portion 112, thereby isolating the signal between two adjacent pixels. On the other hand, the hole injection layer 71 extends towards the first conductor portion 111 of the conductor 50 to fill the recessed structure of the conductor 50, thereby raising the second electrode 80 to ensure that the second electrode 80 can contact the sidewall of the conductor 50, realizing the electrical signal connection of the entire cathode. Specifically, the second electrode 80 is connected to the second conductor portion 112 of the conductor 50.

[0047] In a preferred embodiment, the thickness of the organic light-emitting layer 70 is equal to or greater than the height of the recessed structure of the conductor 50, that is, the thickness of the organic light-emitting layer 70 is not less than the height / thickness of the first conductor portion 111 of the conductor 50. The thickness of the organic layers of the organic light-emitting layer 70, excluding the hole injection layer 71, is greater than the difference between the height of the first conductor portion 111 and the thickness of the hole injection layer 71, so that the remaining organic layers fill the space between the first conductor portion 111 and the second conductor portion 112. This facilitates the subsequent deposition of the cathode on the sidewall / sloping surface of the conductor 50, thereby enabling the conductor 50 to transmit electrical signals to the cathode. The organic light-emitting layer 70 may or may not overlap with the second conductor portion 112 of the conductor 50. In other embodiments, the thickness of the organic light-emitting layer 70 may be slightly less than the height of the recessed structure of the conductor 50, but the sum of the thicknesses of the organic light-emitting layer 70 and the second electrode 80 must be greater than the height of the first conductor portion 111, thereby ensuring that the second electrode 80 overlaps with the sidewall of the second conductor portion 112 of the conductor 50.

[0048] In a preferred embodiment, the end of the eaves structure 60 protrudes beyond the end of the conductor 50, meaning the area of ​​the eaves structure 60 on the vertical projection plane is greater than the area of ​​the conductor 50 on the vertical projection plane. It should be noted that "end" refers to the farthest point of the structure; the end of the eaves structure 60 refers to the farthest point of the eaves structure 60 in the second direction X, and the end of the conductor 50 refers to the farthest point of the conductor 50 in the second direction X.

[0049] The spacing between the end of the eaves structure 60 extending along the second direction X and the end of the conductor 50 extending along the second direction X is between 0.4µm and 1µm. Please refer to further details. Figure 6 , Figure 6 This is a partial structural diagram of an embodiment of the display panel provided in this application. Figure 6As shown, the distance between the end of the eaves structure 60 and the end of the conductor 50 in the second direction X is Ux, 0.4um ≤ Ux ≤ 1.0um. Further, the distance between the bottom of the eaves structure 60 and the bottom of the conductor 50 in the first direction Y is between 0.5um and 1.2um, that is, the thickness Uy of the conductor 50 in the first direction Y is between 0.5um and 1.2um. By limiting the distance between the end of the eaves structure 60 and the end of the conductor 50, the second electrode 80 can be deposited according to the original deposition angle, and the second electrode 80 can also contact the sidewall of the conductor 50.

[0050] Preferably, the thickness of the eaves structure 60 in the direction perpendicular to the projection plane (first direction Y) is between 0.05um and 3um.

[0051] The beneficial effects of this application are as follows: By forming a recessed structure of a certain size at the bottom of the conductor, the partial film layer (hole injection layer) in the organic light-emitting layer is isolated from the conductor. Specifically, by making the recessed length of the first conductor portion between 0.1-1µm and the recessed height between 0.01-0.2µm, it is ensured that while maintaining the original evaporation angle and evaporation film thickness, the hole injection layer in the organic light-emitting layer is spaced apart from the conductor, so that the hole injection layer in the organic light-emitting layer will never come into contact with the conductor, avoiding the problem of electrical signal crosstalk between adjacent pixels. By making the recessed height of the first conductor portion between 0.01-0.2µm, it is ensured that the cathode can overlap with the second conductor portion of the conductor, thereby improving the reliability of the cathode-conductor overlap, ensuring the stability of cathode conduction, and improving display quality.

[0052] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes: substrate; A driving circuit is stacked and disposed on the substrate; Multiple first electrodes are spaced apart on the drive circuit stack; A pixel definition layer is disposed between a plurality of first electrodes on the driving circuit stack; A conductor is disposed on the surface of the pixel definition layer. The conductor includes a first conductor portion and a second conductor portion stacked along a first direction. The first conductor portion is located below the orthographic projection plane of the second conductor portion, and the first conductor portion is recessed into the end of the second conductor portion along a second direction. The first direction and the second direction are perpendicular to each other. An eaves structure is disposed on the surface of the conductor away from the pixel definition layer; An organic light-emitting layer is disposed within a pixel opening between two adjacent conductors and spaced apart from the first conductor portion of the conductor; The second electrode is disposed on the surface of the organic light-emitting layer between two adjacent conductors and is connected to the sidewall of the second conductor portion of the conductor.

2. The display panel according to claim 1, characterized in that, The organic light-emitting layer includes a hole injection layer, which is not in contact with either the first conductor portion or the second conductor portion of the conductor.

3. The display panel according to claim 1, characterized in that, The vertical cross-section of the second conductor portion has a trapezoidal structure that is narrower at the top and wider at the bottom; The vertical cross-section of the first conductor portion includes a trapezoidal structure that is narrower at the top and wider at the bottom, an inverted trapezoidal structure that is wider at the top and narrower at the bottom, and a rectangular structure that is equal in width at the top and bottom.

4. The display panel according to claim 1, characterized in that, The distance between the end of the second conductor portion and the end of the first conductor portion in the second direction is between 0.1 and 1 μm.

5. The display panel according to claim 4, characterized in that, The height of the first conductor portion along the first direction is between 0.01um and 0.2um.

6. The display panel according to claim 1, characterized in that, The area of ​​the eaves structure on the vertical projection plane is greater than the area of ​​the conductor on the vertical projection plane; The distance between the end of the eaves structure extending in the second direction and the end of the conductor extending in the second direction is between 0.4 μm and 1 μm.

7. The display panel according to claim 6, characterized in that, The distance between the bottom of the eaves structure and the bottom of the conductor along the first direction is between 0.5um and 1.2um.

8. The display panel according to claim 6, characterized in that, The thickness of the eaves structure along the direction perpendicular to the projection plane is between 0.05um and 3um.

9. The display panel according to claim 1, characterized in that, The conductor comprises a metal or a conductive oxide or a stacked structure formed of a metal and a conductive oxide. The metals include copper, iron, aluminum, molybdenum, nickel, silver, magnesium, and calcium; the conductive oxides include indium oxide, tin oxide, and indium tin oxide.

10. The display panel according to claim 2, characterized in that, The height of the first conductor portion along the first direction is greater than the height of the hole injection layer, but less than the sum of the thicknesses of the organic light-emitting layer and the second electrode.

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