Organic light emitting device

Abstract

The application provides an organic light-emitting device applied to the field of light-emitting display, which comprises a substrate, a light-emitting layer and a cathode; the substrate comprises a substrate, an anode, an auxiliary electrode and an anode lead wire, an insulating layer covering the auxiliary electrode and the anode lead wire and an isolation column on the insulating layer; the light-emitting layer is located on the side of the anode and the insulating layer away from the substrate; the cathode is located on the side of the light-emitting layer away from the anode; the cathode comprises a first cathode on the top surface of the isolation column and a second cathode around the isolation column; the first cathode and the second cathode are disconnected; the application reduces the area of the cathode participating in electrical conduction, thereby reducing the possibility of the anode being connected with the cathode when the insulating layer has defects, reducing the risk of short circuit of the organic light-emitting device due to the insulating layer; the cathode is separated by the isolation column, thereby reducing the heat conduction in the plane, reducing the heat gathering of the cathode, controlling the heat in the light-emitting direction and thereby realizing the centralized management of the heat.

Description

Technical Field

[0001] This invention relates to the field of light-emitting display technology, and more particularly to an organic light-emitting device. Background Technology

[0002] Organic light-emitting display (OLED) devices have advantages such as active light emission, wide color gamut, fast response, wide viewing angle, high contrast and planarity, and are the development trend of next-generation display and lighting technologies.

[0003] OLEDs are surface light sources, and their main structure includes a substrate, an anode, a light-emitting layer, and a cathode. The substrate is formed primarily using semiconductor photolithography to fabricate the anode, auxiliary electrodes, and insulating layer on the substrate. The insulating layer's main functions are pixel definition and insulation. Currently, to reduce gases in the device, inorganic dielectric layers are typically used instead of traditional organic adhesives to achieve insulation and improve device reliability. However, during the fabrication of inorganic dielectric layers, the presence of microparticles inevitably affects the film quality of the inorganic dielectric layer, making the device prone to short circuits and impacting its reliability. Summary of the Invention

[0004] This invention provides an organic light-emitting device that can reduce the risk of short circuits due to the insulating layer and improve device reliability.

[0005] In a first aspect, embodiments of the present invention provide an organic light-emitting device, comprising:

[0006] The substrate includes a substrate, an anode, an auxiliary electrode and an anode lead disposed on the substrate, an insulating layer covering the auxiliary electrode and the anode lead, and an isolation pillar located on the insulating layer;

[0007] A light-emitting layer, located on the side of the anode and insulating layer away from the substrate; and,

[0008] The cathode is located on the side of the light-emitting layer away from the anode; the cathode includes a first cathode located on the top surface of the isolation pillar and a second cathode located around the isolation pillar; the first cathode and the second cathode are disconnected.

[0009] In one possible implementation, the light-emitting layer includes multiple light-emitting regions; the isolation pillar isolates the second cathode into a cathode-connected region, which includes multiple sub-regions and multiple connection regions; wherein each sub-region corresponds to one light-emitting region; and each connection region connects two adjacent sub-regions.

[0010] In one possible implementation, the isolation pillars include a plurality of first isolation pillars and second isolation pillars;

[0011] Each light-emitting area corresponds to a first isolation pillar; each first isolation pillar is arranged around the corresponding light-emitting area and has at least one opening.

[0012] The second isolation pillar includes multiple isolation pillar pairs; the openings of the first isolation pillars of each two adjacent light-emitting areas are connected by an isolation pillar pair; the area surrounded by each first isolation pillar forms a sub-area, and the area between each isolation pillar pair forms a connection area.

[0013] In one possible implementation, multiple light-emitting areas are arranged in a rectangular array, with the first isolation pillars of two adjacent light-emitting areas in the same row having openings on opposite sides, and the first isolation pillars of two adjacent light-emitting areas in the same column having openings on opposite sides.

[0014] In one possible implementation, the substrate further includes a first cathode lead disposed on the substrate, and an insulating layer covering the first cathode lead; the insulating layer has a first overlap hole located below the cathode communication region and above the first cathode lead; the cathode communication region is electrically connected to the first cathode lead through the first overlap hole.

[0015] In one possible implementation, the light-emitting layer includes multiple light-emitting regions; the isolation pillars include multiple third isolation pillars;

[0016] The third isolation pillar corresponds one-to-one with the light-emitting area, and each third isolation pillar is set around the corresponding light-emitting area; the second cathode of the area surrounded by the inner side of each third isolation pillar forms an isolated first cathode area.

[0017] In one possible implementation, the substrate further includes a plurality of second cathode leads disposed on the substrate, and an insulating layer covers the plurality of second cathode leads; the insulating layer is provided with a plurality of second overlap holes; the second cathode leads, the second overlap holes, and the first cathode regions correspond one-to-one; each second overlap hole is located below the corresponding first cathode region and above the corresponding second cathode lead; each first cathode region is electrically connected to the corresponding second cathode lead through the corresponding second overlap hole.

[0018] In one possible implementation, the light-emitting layer includes multiple light-emitting regions; the isolation pillars include multiple fourth isolation pillars.

[0019] Multiple fourth isolation pillars divide the cathode layer formed by the second cathode into multiple non-interconnected second cathode regions; each second cathode region corresponds to at least one light-emitting region; each second cathode region contains a portion of the edge region of the cathode layer;

[0020] Each second cathode region corresponds to a third overlap hole, a third cathode lead, and an overlap pin; the third overlap hole corresponding to each second cathode region is located on the insulating layer below the edge region included in the second cathode region; the third cathode lead corresponding to each second cathode region is located in a first region on the substrate, which is the region on the substrate other than the region corresponding to the cathode layer; each second cathode region is connected to the corresponding overlap pin through the corresponding third overlap hole and the corresponding third cathode lead.

[0021] In one possible implementation, the cross-section of the isolation column is a trapezoid with the lower base length being less than the upper base length; the top surface of the isolation column is higher than the second cathode.

[0022] In one possible implementation, the first cathode is also used as a touch electrode.

[0023] The organic light-emitting device provided in this embodiment of the invention includes isolation pillars disposed on an insulating layer of a substrate. Through the structure of the isolation pillars, the substrate, the light-emitting layer, and the cathode, the cathode is separated by the isolation pillars. The cathode comprises a first cathode located on the top surface of the isolation pillars and a second cathode located around the isolation pillars. The first and second cathodes are disconnected. Thus, the first cathode is not located in the light-emitting area of ​​the organic light-emitting device and no longer participates in electrical conduction. Even if there are defects in the insulating layer below the first cathode, a short circuit will not occur between the first cathode and the anode. By reducing the area of ​​the cathode participating in electrical conduction, the possibility of anode-cathode connection when the insulating layer is defective is reduced, thereby reducing the risk of short circuit due to insulating layer defects in the organic light-emitting device. Furthermore, by separating the cathodes with isolation pillars and disconnecting the first and second cathodes, heat conduction in the plane where the cathode is located can be reduced, reducing heat accumulation in the cathode and controlling heat in the light-emitting direction, thereby achieving centralized heat management. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 It is along Figure 2 Cross-sectional view of AA';

[0026] Figure 2 This is a top view of an organic light-emitting device provided in an embodiment of the present invention;

[0027] Figure 3 yes Figure 1 A schematic diagram showing the dimensions of the isolation columns;

[0028] Figure 4 This is a schematic diagram of the structure of an organic light-emitting device provided in another embodiment of the present invention;

[0029] Figure 5 yes Figure 4 A schematic diagram of the first cathode on a single light-emitting area and surrounding isolation pillars projected onto the substrate;

[0030] Figure 6 This is a schematic diagram of the cathode and light-emitting area of ​​an organic light-emitting device provided in another embodiment of the present invention projected onto a substrate. Detailed Implementation

[0031] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0032] The following embodiments will help those skilled in the art to further understand the function of the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0034] It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] In the description of this invention and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0037] Furthermore, the term "multiple" mentioned in the embodiments of this invention should be interpreted as two or more.

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0039] See Figure 1 This diagram illustrates the structure of an organic light-emitting device provided in an embodiment of the present invention. The aforementioned organic light-emitting device may include:

[0040] The substrate includes a substrate 101, an anode 102, an auxiliary electrode 104 and an anode lead 103 disposed on the substrate 101, an insulating layer 105 covering the auxiliary electrode 104 and the anode lead 103, and an isolation pillar 106 located on the insulating layer 105.

[0041] The light-emitting layer 107 is located on the side of the anode 102 and the insulating layer 105 away from the substrate 101. The light-emitting layer 107 is divided into at least two light-emitting areas by the isolation pillar 106.

[0042] The cathode 108 is located on the side of the light-emitting layer 107 away from the anode 102. The anode 102 and the cathode 108 can be located on opposite sides of the light-emitting layer 107.

[0043] The cathode 108 includes a first cathode 1081 located on the top surface of the isolation pillar 106 and a second cathode 1082 located around the isolation pillar 106; the first cathode 1081 and the second cathode 1082 are disconnected.

[0044] The insulating layer 105 has an opening that exposes part of the anode 102, meaning that in addition to covering the auxiliary electrode 104 and the anode lead 103, the insulating layer 105 can also cover a portion of the anode 102.

[0045] The light-emitting layer 107 can cover the entire substrate, or it can only fill the opening in the insulating layer 105, covering the portion of the anode 102 that is not covered by the insulating layer 105.

[0046] The auxiliary electrode 104 can be configured as a grid, located around the light-emitting area, to improve the light emission uniformity of the organic light-emitting device. The auxiliary electrode 104 can be made of a metallic material. For example, the auxiliary electrode 104 and the anode lead 103 can be made of the same metallic material. This embodiment of the invention does not impose a specific limitation on the number of leads or grids included in the auxiliary electrode 104; the number can be set according to actual needs. The anode lead 103 can be electrically connected to the anode 102 through the auxiliary electrode 104.

[0047] The embodiments of the present invention do not impose specific limitations on the number of anodes 102 and anode leads 103, and can be set according to actual needs.

[0048] The substrate 101 can be a glass substrate or a flexible substrate; no specific limitation is made here. The cathode 108 can be a metal cathode. The material of the metal cathode can be a single metal material, such as aluminum, silver, molybdenum, etc., or an alloy material, such as an alloy formed of two or more metals, such as aluminum, magnesium, calcium, etc.

[0049] In traditional organic light-emitting devices (OLEDs), the entire cathode layer participates in electrical conduction. When the insulating layer has defects, the cathode and anode can overlap, causing a short circuit. The OLED provided in this embodiment of the invention uses an isolation pillar 106 to separate the cathode 108. The cathode 108 includes a first cathode 1081 located on the top surface of the isolation pillar 106 and a second cathode 1082 located around the isolation pillar 106. The first cathode 1081 and the second cathode 1082 are disconnected. Thus, the first cathode 1081 is not located in the light-emitting area of ​​the OLED and no longer participates in electrical conduction. Even if the insulating layer below the first cathode 1081 has defects, the first cathode 1081 and the anode lead 103 or auxiliary electrode 10... 4. Short circuits will not occur. By reducing the area of ​​the cathode 108 involved in electrical conduction, the possibility of the anode 102 and cathode 108 connecting when there are defects in the insulating layer 105 is reduced, thereby reducing the risk of short circuits in the organic light-emitting device due to the insulating layer 105. In addition, by setting the isolation pillar 106 to separate the cathode 108, the first cathode 1081 and the second cathode 1082 are disconnected, which can reduce the heat conduction in the plane where the cathode 108 is located, reduce the heat accumulation of the cathode 108, and control the heat in the light-emitting direction, thereby achieving centralized heat management.

[0050] There are many different design ideas for the graphical design of the isolation column 106, which will be explained below with reference to different embodiments.

[0051] Example 1:

[0052] The light-emitting layer 107 includes multiple light-emitting regions. The isolation pillar 106 isolates the second cathode 1082 into a cathode connection region. This cathode connection region includes multiple sub-regions and multiple connection regions. Each sub-region corresponds to one light-emitting region; each connection region connects two adjacent sub-regions.

[0053] In this embodiment, the graphical design of the isolation pillar 106 forms a sub-region for each second cathode 1082 above the light-emitting area, while also isolating a connection area. This connection area connects all sub-regions into a single cathode connection area. Thus, when the organic light-emitting device is operating, because the cathode connection area is disconnected from the second cathode 1082, only this cathode connection area is conductive, while the areas formed by the second cathode 1082 outside this cathode connection area are not conductive. Furthermore, since all sub-regions are connected, the cathode can be energized and controlled via a single lead, making it easy to implement. In other words, in this embodiment, the cathode 108 corresponding to the light-emitting area (the aforementioned cathode connection area) participates in electrical conduction, while the cathode 108 corresponding to the non-light-emitting area (the aforementioned first cathode 1081 and the second cathode 1082 outside the aforementioned cathode connection area) does not participate in electrical conduction. Therefore, defects in the insulating layer 105 of the non-light-emitting area will not cause a short circuit between the cathode and anode of the organic light-emitting device, further reducing the risk of short circuits due to the insulating layer 105.

[0054] The following explanation is based on the accompanying drawings. Figure 2 This is a top view of an organic light-emitting device provided in an embodiment of the present invention. Figure 1 For along Figure 2 Cross-sectional view of AA'. It should be noted that the top view of the organic light-emitting device always shows the cathode 108, i.e. Figure 2 All shown are cathode 108. For ease of distinction, [the following is a list of components]. Figure 2 Different patterns are used to represent different regions of the cathode 108. The area filled with diagonal lines represents the first cathode 1081 located on the top surface of the isolation pillar 106 (cathode area B1 in the figure); the area filled with gray represents the second cathode 1082 on the nine rectangular light-emitting areas (cathode area B2 in the figure) and the second cathode 1082 that connects the nine rectangular light-emitting areas (cathode area B3 in the figure); the area filled with dots and short dashes represents the second cathode 1082 in other areas (cathode area B4 in the figure). Among them, cathode areas B2 and B3 are the cathode connecting areas mentioned above. It can be seen that the area of ​​the cathode connecting area only accounts for a part of the total area of ​​the cathode, that is, the area of ​​the cathode 108 involved in electrical conduction is greatly reduced.

[0055] Reference Figure 1 and Figure 2 In some implementations, the isolation pillar 106 includes multiple first isolation pillars and second isolation pillars.

[0056] Each light-emitting area corresponds one-to-one with a first isolation pillar. Each first isolation pillar is arranged around the corresponding light-emitting area and has at least one opening.

[0057] The second isolation pillar comprises multiple isolation pillar pairs. The openings of the first isolation pillars of each pair of adjacent light-emitting areas are connected by an isolation pillar pair. The area surrounded by each first isolation pillar forms a sub-area, and the area between each pair of isolation pillars forms a connection area.

[0058] Specifically Figure 2 In this configuration, the first isolation pillar is located around the B2 cathode region and below the B1 cathode region. The isolation pillar pair consists of two parallel isolation pillars with a gap between them, located on both sides of the B3 cathode region and below the B1 cathode region. The entire area connecting the B2 and B3 cathode regions is the aforementioned cathode connection area.

[0059] In this embodiment, the aforementioned connection area can also be referred to as the cathode connection port. The cathode connection port can be formed through a graphical design of isolation pillars (such as...). Figure 2 The design of the central isolation column ensures that the cathode 108 at the cathode connector and the cathode 108 in the light-emitting area are connected during the full-layer evaporation, thus forming a connected cathode connection area. In this embodiment, the overall connection of cathodes in multiple light-emitting areas can be achieved through the cathode connector.

[0060] For example, refer to Figure 2 Multiple light-emitting areas are arranged in a rectangular array. The first isolation pillars of two adjacent light-emitting areas in the same row have openings on opposite sides, and the first isolation pillars of two adjacent light-emitting areas in the same column also have openings on opposite sides. This arrangement ensures a uniform distribution of the multiple light-emitting areas and the cathode connections between them, resulting in more uniform light emission and heat conduction in the organic light-emitting device.

[0061] It should be noted that the light-emitting area can also be triangular, trapezoidal, circular, or other shapes. The arrangement of the light-emitting areas can also be linear, curved, circular, or other array arrangements. The arrangement of the isolation column pairs connecting different light-emitting areas can be adjusted according to the shape and array arrangement of the light-emitting areas, so that the cathodes on all light-emitting areas can be connected into a whole connected area, and the area occupied by the cathode connection port is relatively small compared to the light-emitting area. There are no restrictions here.

[0062] In the above embodiments, the cathode connection area formed by cathode regions B2 and B3 participates in electrical conduction, realizing the light-emitting function of the light-emitting area. Cathode regions B1 and B4 do not participate in electrical conduction and are disconnected from cathode regions B2 and B3. For organic light-emitting devices, when there is a defect in the insulating layer 105, the cathode above the defect location and the anode below it will overlap, causing a short circuit. However, in this embodiment, due to the design of the isolation pillar, the cathodes of the light-emitting area (cathode regions B2 and B3) and the cathodes of the non-light-emitting area (cathode regions B1 and B4) are disconnected. The cathodes of the non-light-emitting area are not energized, so the defect in the insulating layer 105 of the non-light-emitting area will not cause the cathode and anode to short-circuit, thereby reducing the risk of short circuit in the organic light-emitting device.

[0063] Optionally, the substrate further includes a first cathode lead (not shown) disposed on the substrate 101. An insulating layer 105 covers the first cathode lead (not shown). The insulating layer 105 has a first overlap hole. The first overlap hole is located below the cathode communication region and above the first cathode lead. The cathode communication region is electrically connected to the first cathode lead through the first overlap hole.

[0064] The first overlapping hole can be achieved by etching a via in the insulating layer 105. The first cathode lead can be fabricated on the substrate in the same layer as the anode and anode lead 103, and the first cathode lead and anode lead 103 can be made of the same material. By using the first cathode lead and the first overlapping hole in the insulating layer 105 below the cathode connection region, the power supply to the cathode connection region can be controlled.

[0065] In some embodiments, see Figure 1 and Figure 3 The isolation pillar 106 has a trapezoidal cross-section where the lower base length is shorter than the upper base length (also known as an inverted trapezoid). The top surface of the isolation pillar 106 is higher than the second cathode 1082. Optionally, the height H of the isolation pillar 106 is greater than the sum of the thickness of the cathode 108 and the thickness of the light-emitting layer 107. For example, the height H of the isolation pillar 106 is 1-3 μm; the width L of the top surface of the isolation pillar 106 is 3-20 μm; and the angle α between the bottom surface and the waist of the cross-section of the isolation pillar 106 is 90-120 degrees.

[0066] In the fabrication process of organic light-emitting devices, patterned isolation pillars 106 are typically deposited first, followed by the deposition of the light-emitting layer 107, and then the deposition of the entire cathode 108 (including the first cathode 1081 and the second cathode 1082). The isolation pillars are designed to ensure that, during the deposition of the cathode 108, the first cathode 1081 located on the top surface of the isolation pillar 106 and the second cathode 1082 located around the isolation pillar 106 are disconnected due to their height difference, and that the second cathodes 1082 on both sides of the isolation pillar are disconnected by the isolation pillar 106. Therefore, the height H of the isolation pillar 106 is related to the thickness of the light-emitting layer 107 and the cathode 108. This height H is designed to be greater than the sum of the thicknesses of the light-emitting layer 107 and the cathode 108, thereby ensuring that the first cathode 1081 and the second cathode 1082 are completely disconnected.

[0067] If the cross-section of the isolation pillar 106 is designed as a trapezoid, then during the cathode deposition process, the top surface of the isolation pillar 106 cannot cover the waist portion, and therefore the waist portion will also be coated with cathode. This would cause the first cathode 1081 on the top surface of the isolation pillar 106 to connect with the second cathode 1082 around the isolation pillar 106 through the cathode in the waist portion, rendering the isolation pillar 106 ineffective in its isolation disconnection function. To avoid this problem, this embodiment designs the cross-section of the isolation pillar 106 as an inverted trapezoid. During the cathode deposition process, the top surface of the isolation pillar 106 covers the waist portion, preventing cathode deposition in the waist portion and ensuring a disconnection between the first cathode 1081 on the top surface of the isolation pillar 106 and the second cathode 1082 around the isolation pillar 106.

[0068] Furthermore, when selecting the angle α between the bottom and waist of the isolation column 106 cross-section, and the width L of the top surface of the isolation column 106, the stability and manufacturing difficulty of the isolation column 106 can be considered. Since the cross-section of the isolation column 106 is an inverted trapezoid, generally, the smaller the width L of the top surface of the isolation column 106 and the larger the obtuse angle α, the greater the manufacturing difficulty. Specifically, the range of values ​​for the angle α and the width L of the top surface of the isolation column 106 can be determined through testing or experience, and is not limited here.

[0069] Example 2:

[0070] Unlike the design in Embodiment 1, which connects the second cathodes 1082 on all light-emitting areas through the cathode connection port, this embodiment designs isolation pillars to isolate each light-emitting area separately, without forming a connected area.

[0071] Reference Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of an organic light-emitting device according to another embodiment of the present invention. Figure 5 for Figure 4 A schematic diagram of the first cathode projected onto the substrate from a single light-emitting area and surrounding isolation pillars, along... Figure 5 The cross-sectional view of BB' in the diagram corresponds to Figure 4 A schematic diagram of the structure of a single light-emitting area and the isolation pillars on both sides.

[0072] In this embodiment, the light-emitting layer 107 includes multiple light-emitting regions. The isolation pillars include multiple third isolation pillars.

[0073] The third isolation pillar corresponds one-to-one with the light-emitting area. Each third isolation pillar is arranged around the corresponding light-emitting area. The second cathode of the area surrounded by the inner side of each third isolation pillar forms an isolated first cathode area.

[0074] Figure 5 The gray triangular area in the middle represents a light-emitting area, and the surrounding triangular border represents the first cathode 1081 on the third isolation pillar. (Combined) Figure 4 and Figure 5 As can be seen, in this embodiment, the third isolation column isolates a single light-emitting area. This part of the second cathode 1082 forms a separate cathode area (referred to as the first cathode area for ease of description), which is not connected to the second cathode 1082 of other light-emitting areas. Thus, the cathode and anode of each light-emitting area can be controlled separately, and the operation of each light-emitting area can be controlled separately. The operating status and short circuit conditions of each light-emitting area do not affect each other.

[0075] Optionally, continue to refer to Figure 4 and Figure 5 The substrate also includes a plurality of second cathode leads 109 disposed on the substrate 101. An insulating layer 105 covers the plurality of second cathode leads 109. The insulating layer 105 is provided with a plurality of second overlap holes 110. The second cathode leads 109, the second overlap holes 110, and the first cathode regions correspond one-to-one. Each second overlap hole 110 is located below the corresponding first cathode region and above the corresponding second cathode lead 109. Each first cathode region is electrically connected to the corresponding second cathode lead 109 through the corresponding second overlap hole 110.

[0076] Reference Figure 4 and Figure 5 In this embodiment, the light-emitting layer 107 can be fabricated using a fine metal mask (FMM) so that it is located only above the anode 102. A gap is left between the third isolation pillar and the surrounding light-emitting area, and the second overlap hole 110 can be provided on the insulating layer within this gap. By providing a separate second overlap hole and a second cathode lead for the first cathode area on each light-emitting area, individual light emission control for each light-emitting area can be achieved.

[0077] Specifically, the area of ​​the lighting screen corresponding to the organic light-emitting device (OLED) is relatively large, and the lateral voltage drop of the anode 102 of the OLED causes a decrease in the uniformity of light emission from the screen. Therefore, it is necessary to divide the large area into segments and use a large number of small areas for regional lighting control. In this embodiment of the invention, the isolation pillar 106 allows for the separate wiring of smaller light-emitting areas, enabling individual driving of each light-emitting area. Because the area of ​​the light-emitting area is reduced, the uniformity of light emission does not need to consider the lateral voltage drop, and the brightness can be significantly improved, thereby enabling the design of a high-brightness screen.

[0078] Organic light-emitting devices (OLEDs) require large lighting screens, resulting in significant power consumption and heat generation. This embodiment of the invention introduces an isolation pillar 106 to separate the cathode 108 from the lateral plane, reducing heat conduction and thus heat accumulation in the cathode 108. This directs heat towards the light-emitting direction, meaning the heat transfer direction is the same as the light-emitting direction. Figure 4 As shown, this allows for centralized heat management. For example, a high-heat-dissipation film can be applied to the back of the screen to reduce the surface temperature of the screen.

[0079] Example 3:

[0080] Figure 6 This is a schematic diagram of the cathode and light-emitting area of ​​an organic light-emitting device provided in another embodiment of the present invention projected onto a substrate. Figure 6 The area filled with a diagonal line represents the first cathode 1081 located on the top surface of the isolation pillar 106 (cathode area C1 in the figure); the area filled with a gray triangle represents the second cathode 1082 above the light-emitting area; the area filled with dots and short dashes represents the second cathode 1082 area containing the light-emitting area (cathode area C2 in the figure, a total of six) divided by the isolation pillar 106, and the second cathode 1082 area not containing the light-emitting area (cathode area C3 in the figure, one).

[0081] In this embodiment, the light-emitting layer 107 includes multiple light-emitting regions. The isolation pillars 106 include multiple fourth isolation pillars ( Figure 6 (The cathode region is located below C1, not shown).

[0082] Multiple fourth isolation pillars divide the cathode layer formed by the second cathode 1082 into multiple non-interconnected second cathode regions. Figure 6 (C2 cathode region). Each second cathode region corresponds to at least one light-emitting region. Each second cathode region contains a portion of the edge region of the cathode layer.

[0083] Each second cathode region corresponds to a third overlap hole 111, a third cathode lead 112, and an overlap pin 113. The third overlap hole 111 for each second cathode region is located on the insulating layer below the edge region included in the second cathode region. The third cathode lead 112 for each second cathode region is located in a first region on the substrate, which is the region on the substrate other than the region corresponding to the cathode layer. Each second cathode region is connected to the corresponding overlap pin 113 through the corresponding third overlap hole 111 and the corresponding third cathode lead 112.

[0084] Specifically Figure 6 There are six second cathode regions (numbered ① to ⑥ for ease of description, not shown in the figure). There are six third overlapping holes 111, numbered a to f. There are 18 light-emitting regions, numbered 1 to 18. The correspondence between the second cathode region, the light-emitting region, and the third overlapping hole 111 is shown in the table below:

[0085] Table 1. Correspondence between the second cathode region, the light-emitting region, and the third overlapping hole 111

[0086]

[0087]

[0088] It should be noted that, Figure 6 For illustrative purposes only, the number and shape of the light-emitting area, the number and distribution of the C2 cathode area, and the number and distribution of the C3 cathode area vary depending on the different graphical designs of the isolation pillars, and are not limited here. The C3 cathode area does not contain the light-emitting area and does not participate in electrical conduction. In the design, while maintaining a reasonable layout of the C2 cathode area, the area of ​​the C3 cathode area can be increased as much as possible to reduce the risk of short circuit.

[0089] In this embodiment, the second cathode 1082 is divided by isolation pillars, so that a portion of the area of ​​the second cathode 1082 containing the light-emitting area is located at the edge of the cathode layer. This allows for the setting of the third overlap hole 111 at the edge of the cathode layer, improving the utilization rate of the wiring at the edge of the cathode layer. Furthermore, it ensures that the third cathode lead 112 on the substrate is distributed outside the projection area of ​​the cathode layer, preventing the third cathode lead 112 from passing through the densely distributed area of ​​the anode 102, anode lead 103, and auxiliary electrode 104. This facilitates wiring and reduces the possibility of short circuit between the third cathode lead 112 and the anode 102, thereby reducing the risk of short circuit.

[0090] In some embodiments, the first cathode 1081 is also used as a touch electrode.

[0091] In this embodiment of the invention, the first cathode 1081 does not participate in electrical conduction during the operation of the organic light-emitting device. If the organic light-emitting device is used in a touch screen display device, then the first cathode 1081 can be used as a touch electrode. For example, Figure 2 In the illustrated embodiment, the light-emitting areas are arranged in an array, and therefore the isolation pillars 106 are also regularly distributed in the row and column directions. An array of overlapping holes can be formed on the isolation pillars 106 and corresponding positions of the insulating layer. The first cathode 1081 is connected to the leads on the substrate 101 for touch signal transmission through these overlapping holes, thus enabling touch signal transmission. This eliminates the need for additional touch electrodes, simplifying the fabrication process of the organic light-emitting device.

[0092] In some embodiments, the isolation post 106 covers all the anode leads 103.

[0093] It should be noted that the isolation post 106 described in the embodiments of the present invention covers all anode leads 103, which does not mean that the isolation post 106 directly covers all anode leads 103, but rather that there is an isolation post 106 above each anode lead 103, which can cover the corresponding anode lead 103. That is, the isolation post 106 can be located above the corresponding position of the insulating layer 105 covering the anode lead 103.

[0094] In this embodiment of the invention, the isolation pillar 106 can cover all the anode leads 103. Thus, if there is a defect in the insulating layer 107 above the anode lead 103, the anode lead 103 at the defect location will not short-circuit with the cathode 108 due to the insulating isolation pillar 106. In this way, the isolation pillar 106 and the insulating layer 107 provide double-layer insulation protection for the anode lead 103, further reducing the possibility of a short circuit between the anode lead 103 and the cathode 108, thereby further reducing the risk of short circuits and further improving the reliability of the organic light-emitting device.

[0095] In some embodiments, the anode 102 comprises indium tin oxide (ITO).

[0096] Anode 102 can also be made from other materials, and no specific restrictions are made here.

[0097] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0098] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. An organic light-emitting device, characterized in that, include: A substrate, the substrate comprising a substrate, an anode, an auxiliary electrode and an anode lead disposed on the substrate, an insulating layer covering the auxiliary electrode and the anode lead, and an isolation pillar located on the insulating layer; A light-emitting layer, the light-emitting layer being located on the side of the anode and the insulating layer away from the substrate; and, The cathode is located on the side of the light-emitting layer away from the anode; the cathode includes a first cathode located on the top surface of the isolation pillar and a second cathode located around the isolation pillar; the first cathode and the second cathode are disconnected; The light-emitting layer includes multiple light-emitting areas; the isolation pillar isolates the second cathode into a cathode communication area, which includes multiple sub-areas and multiple connection areas; each sub-area corresponds to one light-emitting area; each connection area connects two adjacent sub-areas. The isolation pillars include multiple first isolation pillars and second isolation pillars; the light-emitting areas correspond one-to-one with the first isolation pillars; each first isolation pillar is arranged around the corresponding light-emitting area and has at least one opening; the second isolation pillars include multiple isolation pillar pairs; the openings of the first isolation pillars of each two adjacent light-emitting areas are connected by an isolation pillar pair; the area surrounded by each first isolation pillar forms a sub-area, and the area between each isolation pillar pair forms a connection area.

2. The organic light-emitting device according to claim 1, characterized in that, The multiple light-emitting areas are arranged in a rectangular array. The first isolation pillars of two adjacent light-emitting areas in the same row have openings on opposite sides, and the first isolation pillars of two adjacent light-emitting areas in the same column have openings on opposite sides.

3. The organic light-emitting device according to claim 1, characterized in that, The substrate further includes a first cathode lead disposed on the substrate, and the insulating layer covers the first cathode lead; the insulating layer has a first overlap hole, the first overlap hole being located below the cathode communication region and above the first cathode lead; the cathode communication region is electrically connected to the first cathode lead through the first overlap hole.

4. The organic light-emitting device according to any one of claims 1-3, characterized in that, The isolation column has a cross-section that is trapezoidal with a lower base length shorter than the upper base length; the top surface of the isolation column is higher than the second cathode.

5. The organic light-emitting device according to any one of claims 1-3, characterized in that, The first cathode is also used as a touch electrode.

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