WO2020224487A1

WO2020224487A1 - Cover board structure and manufacture method therefor, display panel and display device

Info

Publication number: WO2020224487A1
Application number: PCT/CN2020/087519
Authority: WO
Inventors: 罗程远
Original assignee: 京东方科技集团股份有限公司
Priority date: 2019-05-06
Filing date: 2020-04-28
Publication date: 2020-11-12
Also published as: CN110289366B; CN110289366A

Abstract

Disclosed are a cover board structure, a manufacture method for the cover board structure, a display panel and a display device. The cover board structure may comprise a color film unit and an auxiliary electrode unit. The color film unit comprises an encapsulating cover plate (20), a black matrix (21) and a color film layer (22) formed on the encapsulating cover plate (20), and a flat layer (23) covering the black matrix (21) and the color film layer (22). The auxiliary electrode unit comprises a first spacing post (24) formed on the flat layer (23) at a position corresponding to the black matrix (21), a first auxiliary electrode (25) covering the first spacing post (24), a second spacing post (26) formed on the first auxiliary electrode (25) and corresponding to the first spacing post (24), and a second auxiliary electrode (27) covering the second spacing post (26). The second auxiliary electrode (27) is configured to contact a top electrode on an array substrate in the display panel. The solution can prolong the service life of the display panel.

Description

Cover structure and manufacturing method thereof, display panel and display device

Technical field

At least one embodiment of the present disclosure relates to a cover structure, a manufacturing method of the cover structure, a display panel and a display device.

Background technique

In recent years, OLED (Organic Light-Emitting Diode) has been rapidly developed in the display lighting field due to its advantages of high response, high contrast, and flexibility, and is regarded as having broad application prospects. In particular, top-emission OLED display devices have attracted much attention due to their advantages such as higher aperture ratio and the use of the microcavity effect to achieve optimized light extraction. For an OLED display device with a top emission structure, as a light emitting surface, the top electrode must have a good light transmittance.

Summary of the invention

At least one embodiment of the present disclosure provides a cover structure, a manufacturing method of the cover structure, a display panel and a display device, which can increase the service life of the display panel.

In a first aspect, at least one embodiment of the present disclosure provides a cover structure, which includes:

A color filter unit, the color filter unit comprising a packaging cover plate, a black matrix and a color filter layer formed on the packaging cover plate, and a flat layer covering the black matrix and the color filter layer;

Auxiliary electrode unit, the auxiliary electrode unit includes a first spacer formed on a position of the flat layer corresponding to the black matrix, a first auxiliary electrode covering the first spacer, formed on the first spacer A second spacer on an auxiliary electrode and corresponding to the first spacer, and a second auxiliary electrode covering the second spacer.

In an exemplary embodiment of the present disclosure,

A groove is formed on the surface of the first spacer column facing away from the color filter unit, the groove wall of the groove is covered with the first auxiliary electrode, and the groove wall includes a groove side wall and a groove bottom wall;

The second spacer is disposed in the groove, and the height of the second spacer is greater than the depth of the groove.

In an exemplary embodiment of the present disclosure,

The second spacer is seamlessly attached to the first auxiliary electrode covered on the groove wall of the groove.

In an exemplary embodiment of the present disclosure,

The height of the first spacer is 5 μm to 10 μm, the depth of the groove is 4 μm to 8 μm, and the height of the second spacer is 5 μm to 10 μm.

In an exemplary embodiment of the present disclosure,

The first spacer and the second spacer are made of photoresist resin material.

In an exemplary embodiment of the present disclosure,

The first auxiliary electrode and the second auxiliary electrode are made of metal conductive material, indium zinc oxide or indium tin oxide.

In an exemplary embodiment of the present disclosure,

The sum of the thickness of the first auxiliary electrode and the second auxiliary electrode is 10 nm to 100 nm.

In an exemplary embodiment of the present disclosure,

The orthographic projection of the first spacer on the packaging cover is located in the orthographic projection of the black matrix on the packaging cover.

In an exemplary embodiment of the present disclosure,

There are a plurality of said auxiliary electrode units,

The first auxiliary electrode of each auxiliary electrode unit is connected to form an entire layer of electrode structure, the entire layer of electrode structure also covers the flat layer; and/or

The second auxiliary electrodes of the auxiliary electrode units are connected to form an entire layer of electrode structure, and the entire layer of electrode structure also covers each of the first auxiliary electrodes.

In a second aspect, at least one embodiment of the present disclosure also provides a method for manufacturing a cover structure, which includes:

Forming a color filter unit, the color filter unit including a packaging cover plate, a black matrix and a color filter layer formed on the packaging cover plate, and a flat layer covering the black matrix and the color filter layer;

Forming a first spacer column on a position of the flat layer corresponding to the black matrix;

Forming a first auxiliary electrode covering the first spacer;

Forming a second spacer corresponding to the first spacer on the first auxiliary electrode; and

Forming a second auxiliary electrode covering the second spacer.

In an exemplary embodiment of the present disclosure,

After forming the first spacer on the position of the flat layer corresponding to the black matrix, and before forming the first auxiliary electrode covering the first spacer, the method further includes:

A groove is formed on the surface of the first spacer that faces away from the color filter unit; wherein the groove is configured to accommodate the second spacer, and the height of the second spacer is greater than that of the groove The groove depth.

In a third aspect, at least one embodiment of the present disclosure further provides a display panel, which includes:

An array substrate, the array substrate includes a base substrate, a pixel defining layer formed on the base substrate, an organic light-emitting function layer formed on the pixel defining layer, and a top layer formed on the organic light-emitting function layer. electrode;

In the cover structure of any one of the above embodiments, the auxiliary electrode unit is opposite to the position where the pixel defining layer is located, and the second auxiliary electrode is in contact with the top electrode.

In a fourth aspect, at least one embodiment of the present disclosure also provides a display device, which includes the display panel described in the foregoing embodiment.

The technical solutions provided by the embodiments of the present disclosure can achieve the following beneficial effects:

In the cover structure, the manufacturing method of the cover structure, the display panel and the display device provided by the embodiments of the present disclosure, since the first spacer and the first auxiliary electrode are arranged between the second spacer and the color filter unit, In other words, since the first spacer and the first auxiliary electrode separate the path between the second spacer and the color filter unit, after the cover structure and the array substrate are packaged, the first spacer can be used to set the color first. The water vapor accumulated in the membrane unit is absorbed to a certain extent, and then the water vapor can be blocked to a certain extent by the first auxiliary electrode, which can relieve the water vapor from spreading to the second spacer and the part of the second auxiliary electrode contacting the top electrode This can alleviate the conduction of water vapor to the top electrode and the organic light-emitting function layer, prevent the water vapor from corroding the top electrode and the organic light-emitting function layer and form black spots, and improve the service life of the display device.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the present disclosure.

Description of the drawings

In order to explain the embodiments of the present disclosure or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 shows a schematic structural diagram of a display panel;

FIG. 2 shows a schematic structural diagram of a cover structure provided by an embodiment of the present disclosure;

FIG. 3 shows a flowchart of a method for manufacturing a cover structure provided by an embodiment of the present disclosure;

4 shows a schematic diagram of the method for manufacturing a cover structure provided by an embodiment of the present disclosure after step S300 is completed;

FIG. 5 shows a schematic diagram of a method for manufacturing a cover structure provided by an embodiment of the present disclosure after step S302 is completed;

FIG. 6 shows a schematic diagram of a method for manufacturing a cover structure provided by an embodiment of the present disclosure after step S304 is completed;

FIG. 7 shows a schematic diagram of a method for manufacturing a cover structure provided by an embodiment of the present disclosure after step S306 is completed; and

FIG. 8 shows a schematic structural diagram of a display panel provided by an embodiment of the present disclosure.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the exemplary embodiments of the present invention, rather than all the embodiments. Based on the described exemplary embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present invention.

Unless otherwise defined, the technical terms or scientific terms used herein shall be the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the specification and claims of the patent application of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "a", "one" or "the" do not mean quantity limitation, but mean that there is at least one. "Include" or "include" and other similar words mean that the element or item appearing before the word encompasses the element or item listed after the word and its equivalents, but does not exclude other elements or items. "Up", "Down", etc. are only used to indicate the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

The top transparent electrode in the top emission OLED display device usually uses thin metal, ITO and IZO and other materials. Among them, because of the poor transmittance of the metal, it is easy to increase the resistance when used as a large area electrode after being thinned, which is not conducive to large The development of size devices; the conductivity of high-transparency materials such as ITO and IZO is weaker than that of metals under low-temperature processes. Therefore, metal materials are usually used to fabricate auxiliary electrodes in the non-light-emitting area of the backplane through photolithography, thereby improving the overall conductivity of the top electrode and reducing resistance. However, this photolithography technology requires a complicated process, involving multiple masks and exposure processes, and due to its high temperature, photoresist erosion and other process characteristics, it will damage the light-emitting layer of the OLED device. Therefore, it is not suitable for Mass production.

In order to avoid the above-mentioned problems in the manufacturing process, an auxiliary electrode can be fabricated on the package cover to increase the conductivity of the electrode in the OLED display panel. As shown in FIG. 1, spacers (PS) can be arranged on the packaging cover plate 10 provided with the color film layer 11, and then the auxiliary electrodes 13 are fabricated on the spacers 12, so that in the subsequent process of packaging the OLED display panel, Through the spacer 12 squeezing the packaging glue, the auxiliary electrode 13 formed on the spacer 12 can pass through the packaging glue and contact the top electrode 15 in the array substrate, thereby reducing the resistance of the top electrode. In this example, in order to ensure the function of the auxiliary electrode 13, an auxiliary electrode column 14 may be formed on the side of the spacer 12 facing the package cover plate 10, and the auxiliary electrode column 14 is connected to the auxiliary electrode 13, thereby enhancing the conductivity.

However, since the color film layer 11 disposed on the packaging cover plate 10 mostly uses organic materials, the color film layer 11 is likely to accumulate water vapor in various processes. In this way, after encapsulation, water vapor is easily conducted to the top electrode 15 along the spacer 12, thereby corroding the top electrode 15 and the organic light emitting function layer 16 under the top electrode, forming black spots, and affecting the service life of the OLED display panel.

In order to further solve the above technical problems, an embodiment of the present disclosure provides a cover structure that can be used in an OLED display panel. As shown in FIGS. 2 and 4 to 8, the cover structure provided by the embodiment of the present disclosure may include a color film unit and an auxiliary electrode unit.

According to an embodiment of the present disclosure, the color filter unit may include a packaging cover 20, a black matrix 21 and a color filter layer 22 formed on the packaging cover 20, and a flat layer 23 covering the black matrix 21 and the color filter layer 22. It should be understood that multiple color film layers 22 may be provided, and the plurality of color film layers 22 may include at least a red color film layer for transmitting red light, a green color film layer for transmitting green light, and a blue light film layer. The transparent blue color film layer; wherein, a plurality of color film layers 22 can be arranged on the packaging cover 20 at intervals and arranged in an array. In addition, adjacent color film layers 22 respectively cover the edge area of the black matrix 21, thereby exposing The middle area of the black matrix 21; and the flat layer 23 covers the middle area of the black matrix 21 (that is, the part of the black matrix 21 that is not covered by the color film layer 22) and the color film layers 22; wherein the flat layer 23 can be made of A resin material with elasticity is formed, for example, a resin material with elasticity such as phenol-based resin, polypropylene-based resin, polyimide-based resin, acryl-based resin, etc.; in addition, the thickness of the flat layer 23 is approximately 1 μm to 2 μm, but The embodiments of the present disclosure are not limited to this.

According to an embodiment of the present disclosure, the auxiliary electrode unit may include a first spacer 24 formed on the flat layer 23 at a position corresponding to the black matrix 21, a first auxiliary electrode 25 covering the first spacer 24, and a first auxiliary electrode 25 formed on the first spacer 24. The second spacer 26 on the auxiliary electrode 25 and corresponding to the first spacer 24, and the second auxiliary electrode 27 covering the second spacer 26, the second auxiliary electrode 27 can be configured to be connected to the top of the array substrate in the display panel. The electrode 43 is in contact. It should be noted that the orthographic projection of the first spacer 24 on the packaging cover 20 should be within the orthographic projection of the black matrix 21 on the packaging cover 20, so that the black matrix 21 can completely cover the first spacer 24. This prevents the user from seeing the first spacer 24 through the color film unit. In addition, the orthographic projection of the second spacer 26 on the flat layer 23 is within the orthographic projection of the first spacer 24 on the flat layer 23.

For example, the first spacer 24 and the second spacer 26 can be made of a photoresist resin material. In this way, when the first spacer 24 and the second spacer 26 are made, the step of coating photoresist can be omitted. The first spacer 24 and the second spacer 26 can be formed by directly exposing, developing, stripping, and baking the photoresist resin material, which reduces the processing cost of the first spacer 24 and the second spacer 26. The first auxiliary electrode 25 and the second auxiliary electrode 27 may be made of a metal conductive material, indium zinc oxide (IZO) or indium tin oxide (ITO). For example, the metal conductive material may be metal magnesium (Mg). , Metallic silver (Ag), metallic molybdenum (Mo), metallic neodymium (Nd), metallic aluminum (Al), etc., but not limited thereto. In addition, the sum of the thickness of the first auxiliary electrode 25 and the second auxiliary electrode 27 may be about 10 nm to about 100 nm, but embodiments of the present disclosure are not limited thereto.

It should be understood that the cap structure according to the embodiment of the present disclosure may include a plurality of auxiliary electrode units. As shown in FIG. 2, the first spacers 24 of each auxiliary electrode unit can be arranged in an array on the flat layer 23, and adjacent first spacers 24 can be arranged with one or several sub-pixels spaced apart. The first auxiliary electrode 25 of each auxiliary electrode unit is connected to form a whole-layer electrode structure. For example, when processing the first auxiliary electrode 25 of each auxiliary electrode unit, the first auxiliary electrode material can be vapor-deposited on the first spacer 24 of each auxiliary electrode unit by a whole-layer evaporation method to form a covering The entire electrode structure of each first spacer 24. It should be noted that while the entire electrode structure covers each first spacer 24, it can also cover the flat layer 23. In this way, the coverage stability of the first auxiliary electrode 25 can be improved, and the situation that the first auxiliary electrode 25 falls off the first spacer 24 can be avoided.

According to the embodiment of the present disclosure, the second spacer 26 of each auxiliary electrode unit is formed on the first spacer 24 of each auxiliary electrode unit, and the second spacer 26 and the first spacer 24 pass through the first auxiliary electrode 25. Isolate. The second auxiliary electrodes 27 of each auxiliary electrode unit are connected to form a whole-layer electrode structure. For example, when processing the second auxiliary electrode 27 of each auxiliary electrode unit, the second auxiliary electrode material can be vapor-deposited on the second spacer 26 of each auxiliary electrode unit by a whole-layer evaporation method to form a covering The entire electrode structure of each second spacer 24. It should be noted that while the entire electrode structure covers the second spacer 26, it also covers the first auxiliary electrode 25. In this way, not only can the coverage stability of the second auxiliary electrode 27 be improved, so as to prevent the second auxiliary electrode 27 from falling off the second spacer 26, but also because the second auxiliary electrode 27 covers the first auxiliary electrode 25, that is, In other words, the first auxiliary electrode 25 and the second auxiliary electrode 27 can be electrically connected, so the conductivity of the second auxiliary electrode 27 can be increased, and the resistance of the top electrode 43 can be further reduced.

Based on the above content, since the first spacer 24 and the first auxiliary electrode 25 are arranged between the second spacer 26 and the color filter unit in this embodiment, that is, the first spacer 24 is separated from the first auxiliary electrode 25 The path between the second spacer 26 and the color filter unit is eliminated. Therefore, after the cover structure and the array substrate are packaged, the first spacer 24 can first absorb the water vapor accumulated in the color filter unit to a certain extent. Then the water vapor can be blocked to a certain extent by the first auxiliary electrode 25, which can alleviate the water vapor spreading to the second spacer 26 and the part of the second auxiliary electrode 27 contacting the top electrode 43, thereby alleviating the water vapor transmission In the case of the top electrode 43 and the organic light-emitting function layer 42, the formation of black spots due to the erosion of the top electrode 43 and the organic light-emitting function layer 42 by water vapor is avoided, and the service life of the display panel is improved.

In one embodiment, as shown in FIG. 5, a groove 240 is formed on the surface of the first spacer 24 facing away from the color filter unit, and the second spacer 26 is provided in the groove 240 (as shown in FIG. 7) . It should be noted that because the first auxiliary electrode 25 covers the first spacer 24 and because the groove 240 is a part of the first spacer 24, it can be seen that the groove wall of the groove 240 (the groove wall includes the groove sidewall and the groove The surface of the bottom wall is also covered with the first auxiliary electrode 25, as shown in FIG. 6; that is, the second spacer 26 and the groove wall of the groove 240 are separated by the first auxiliary electrode 25.

In this embodiment, by arranging the second spacer 26 in the groove 240, it is possible to prevent the second spacer 26 from being poorly bonded to the first auxiliary electrode 25 and causing a lateral direction (the lateral direction is the height of the second spacer 26 The vertical direction) is offset, so that the overall structural stability of the auxiliary electrode unit can be improved, and the contact stability of the second auxiliary electrode 27 and the top electrode 43 on the second spacer 26 can be ensured.

Optionally, the second spacer 26 is seamlessly attached to the first auxiliary electrode 25 covering the wall of the groove 240, which can further prevent the second spacer 26 and the first auxiliary electrode 25 from being poorly bonded. The lateral deviation occurs, so that the contact stability between the second auxiliary electrode 27 and the top electrode 43 on the second spacer 26 can be ensured.

In addition, optionally, as shown in FIG. 2, the height of the second spacer 26 is greater than the depth of the groove 240. In other words, the surface of the second spacer 26 facing away from the color filter unit protrudes from the edge of the groove 240 ( This edge is the part of the first spacer 24 that faces away from the color filter unit where the groove 240 is not formed), so as to ensure that the second auxiliary electrode 27 covered on the second spacer 26 can contact the top electrode 43, The contact between the first auxiliary electrode 25 and the top electrode 43 can also be avoided, so that the water vapor in the color film unit can be prevented from spreading to the top electrode 43, and the service life of the display panel can be improved.

For example, the height of the first spacer 24 may be 5 μm to 10 μm, the groove depth of the groove 240 may be 4 μm to 8 μm, and the height of the second spacer column 26 may be 5 μm to 10 μm. It should be noted that the height and groove depth mentioned in the present disclosure all refer to the dimensions in the thickness direction of the cover structure (the Y direction in FIG. 2). In addition, for example, the first spacer 24 and the second spacer 26 are both columnar structures, the cross-sectional width of the first spacer 24 may be 20 μm to 50 μm, and the cross-sectional width of the groove 240 may be 10 μm to 30 μm; The cross-sectional width of the two spacers 26 is adapted to the cross-sectional width of the groove 240, as long as the second spacer 26 can be seamlessly attached to the first auxiliary electrode 25 on the groove wall of the groove 240. It should be noted that the cross-sectional width mentioned here is the dimension in the X direction in FIG. 2.

The embodiments of the present disclosure also provide a method for manufacturing a cover structure, and the cover structure may be the cover structure described in any of the foregoing embodiments. As shown in Figure 3, the manufacturing method of the cover structure may include:

Step S300, forming a color film unit, the color film unit including a packaging cover plate, a black matrix and a color film layer formed on the packaging cover plate, and a flat layer covering the black matrix and the color film layer;

Step S302, forming a first spacer column at a position of the flat layer corresponding to the black matrix;

Step S304, forming a first auxiliary electrode covering the first spacer;

Step S306, forming a second spacer corresponding to the first spacer on the first auxiliary electrode;

Step S308, forming a second auxiliary electrode covering the second spacer pillar, the second auxiliary electrode being configured to be in contact with the top electrode on the array substrate.

In the cover structure manufactured by the above-mentioned manufacturing method, a first spacer and a first auxiliary electrode are arranged between the second spacer and the color filter unit, that is, the first spacer and the first auxiliary electrode are used to isolate The path between the second spacer and the color filter unit is eliminated. Therefore, after the cover structure and the array substrate are packaged, the first spacer can first absorb the water vapor accumulated in the color filter unit to a certain extent, and then The water vapor can be blocked to a certain extent by the first auxiliary electrode, which can relieve the water vapor from spreading to the second spacer and the part of the second auxiliary electrode contacting the top electrode, thereby alleviating the water vapor transmission to the top electrode and organic In the case of the light-emitting functional layer, the formation of black spots due to the erosion of the top electrode and the organic light-emitting functional layer caused by water vapor is avoided, and the service life of the display panel is improved.

The manufacturing method of the cover structure of the present application will be exemplified below in conjunction with the drawings.

In step S300, a color film unit is formed. For example, as shown in FIG. 4, the color filter unit includes a packaging cover 20, a black matrix 21 and a color filter layer 22 formed on the packaging cover 20, and a flat layer 23 covering the black matrix 21 and the color filter layer 22. For example, the black matrix 21 and the color film layer 22 can be sequentially formed on the package cover 20 by exposure, development, etc., and then the cover black matrix 21 and the color film layer can be formed on the package cover 20 by spin coating. 22 of the flat layer 23. The flat layer 23 can be made of a resin material with elasticity such as phenol-based resin, polypropylene-based resin, polyimide-based resin, and acrylic-based resin. Of course, the color filter unit in this embodiment can also be provided with other layer structures except the black matrix 21, the color filter layer 22, and the flat layer 23 according to actual conditions.

In step S302, a first spacer 24 is formed on a position of the flat layer 23 corresponding to the black matrix 21, as shown in FIG. 5. For example, this step S302 may include: first, forming a first photoresist resin material layer on the flat layer 23. For example, the first photoresist resin material may be coated on the flat layer 23 by spin coating, and then cured. The first photoresist resin material is used to form a first photoresist resin material layer on the flat layer 23; then, the first photoresist resin material layer is exposed and developed so that the flat layer 23 corresponds to the black matrix 21 The first spacer 24 is formed in position.

In step S304, a first auxiliary electrode 25 covering the first spacer 24 is formed, as shown in FIG. 6. For example, a PVD (Physical Vapor Deposition) method may be used to deposit the material of the first auxiliary electrode 25 on the package cover 20 to form the first auxiliary electrode 25 covering the first spacer 24. It should be noted that the first auxiliary electrode 25 covers the flat layer 23 while covering the first spacer 24. The first auxiliary electrode 25 can be made of metallic magnesium (Mg), metallic silver (Ag), metallic molybdenum (Mo), metallic neodymium (Nd), metallic aluminum (Al), indium zinc oxide (IZO) or indium tin oxide (ITO) and other materials, but the embodiments of the present disclosure are not limited thereto.

In step S306, a second spacer 26 is formed on the first auxiliary electrode 25, and the orthographic projection of the second spacer 26 on the flat layer 23 may be located within the orthographic projection of the first spacer 24 on the flat layer 23, As shown in Figure 7. For example, this step S306 may include: first, forming a second photoresist resin material layer on the first auxiliary electrode 25. For example, the second photoresist resin material may be coated on the first auxiliary electrode 25 by spin coating or the like. Then, the second photoresist resin material is cured to form a second photoresist resin material layer on the first auxiliary electrode 25; then, the second photoresist resin material layer is exposed and developed to form a second photoresist resin material layer on the first auxiliary electrode. A second spacer 26 corresponding to the first spacer 24 is formed on the 25. It should be noted that the orthographic projection of the second spacer 26 on the flat layer 23 is within the orthographic projection of the first spacer 24 on the flat layer 23.

In step S308, a second auxiliary electrode 27 covering the second spacer 26 is formed. As shown in FIG. 2, the second auxiliary electrode 27 is configured to be in contact with the top electrode 43 on the array substrate. For example, a PVD (Physical Vapor Deposition, physical vapor deposition) method may be used to deposit the material of the second auxiliary electrode 27 on the package cover 20 to form the second auxiliary electrode 27 covering the second spacer 26. It should be noted that, while covering the second spacer 26, the second auxiliary electrode 27 also covers the first auxiliary electrode 25. The second auxiliary electrode 27 can be made of metallic magnesium (Mg), metallic silver (Ag), metallic molybdenum (Mo), metallic neodymium (Nd), metallic aluminum (Al), indium zinc oxide (IZO) or indium tin oxide (ITO) and other materials, but the embodiments of the present disclosure are not limited thereto.

In an embodiment, after step S302 and before step S304, the manufacturing method of the cover structure may further include:

In step S303, a groove 240 is formed on the surface of the first spacer 24 away from the color filter unit, as shown in FIG. 5. For example, the surface of the first spacer 24 facing away from the color film unit can be processed by exposure, development, etc., to form the groove 240. The groove 240 is configured to accommodate the second spacer 26, that is, the second spacer 26 can be formed at the position of the groove 240 later. After step S304, the groove wall of the groove 240 is covered with the first auxiliary electrode 25, that is, the second spacer 26 formed subsequently is separated from the groove wall of the groove 240 by the first auxiliary electrode 25. Further, the second spacer 26 formed subsequently and the first auxiliary electrode 25 covering the groove wall of the groove 240 can be seamlessly attached.

In this embodiment, by opening the groove 240 on the first spacer 24 and forming the second spacer 26 at the groove 240, the poor adhesion of the second spacer 26 and the first auxiliary electrode 25 can be avoided. The lateral deviation occurs, so that the contact stability between the second auxiliary electrode 27 on the second spacer 26 and the top electrode 43 can be ensured.

It should be noted that the height of the second spacer 26 to be formed subsequently needs to be greater than the groove depth of the groove 240, so as to ensure that the second auxiliary electrode 27 covered on the second spacer 26 can contact the top electrode 43 while still The contact between the first auxiliary electrode 25 and the top electrode 43 can be avoided, so that the water vapor in the color film unit can be prevented from spreading to the top electrode 43, and the service life of the display panel can be improved.

In an exemplary embodiment, first, the black matrix 21 (BM), the color film layer 22 (CF), and the flat layer 23 can be formed on the package cover 20 by exposure, development, etc.; then, the flat layer 23 can be formed A first spacer 24 with a height of about 5 μm and a cross-sectional width of about 50 μm is formed at a position corresponding to the pixel defining layer (PDL) of the array substrate; then the first spacer 24 can be provided with a cross-sectional width of about 30 μm and a groove depth of about A groove 240 of 4μm; then a first ITO auxiliary electrode (ie, the first auxiliary electrode 25) with a thickness of about 50nm covering the first spacer 24 and the flat layer 23 can be formed on the package cover 20; The second spacer 26 with a height of about 9 μm is formed in the groove 240 on the first spacer 24 by exposure and etching; finally, a second spacer 26 covering the second spacer 26 and the first ITO auxiliary electrode can be formed on the package cover 20 , The second ITO auxiliary electrode (ie, the second auxiliary electrode 27) with a thickness of about 50 nm; thereby completing the fabrication of the cover structure. It should be noted that, in this embodiment, the structure formed by the first spacer 24, the second spacer 26, the first auxiliary electrode 25, and the second auxiliary electrode 27 may be referred to as an auxiliary electrode unit.

The embodiment of the present disclosure also provides a display panel, which may be an OLED display panel. As shown in FIG. 8, the display panel may include an array substrate and the cover structure described in any of the foregoing embodiments.

For example, the array substrate may include a base substrate 40, a pixel defining layer 41 formed on the base substrate 40, an organic light emitting function layer 42 formed on the pixel defining layer 41, and a top electrode 43 formed on the organic light emitting function layer 42 . For example, the top electrode 43 may be a cathode. It should be understood that, for the sake of brevity, the bottom electrode (that is, the bottom electrode may be an anode) and TFT (Thin Film Transistor) included in the array substrate are not shown in the figure.

In this embodiment, the auxiliary electrode unit of the cover structure may be opposite to the position where the pixel defining layer 41 is located. For example, the first spacer 24 and the second spacer 26 in the auxiliary electrode unit may be opposite to the position where the pixel defining layer 41 is located. When the cover structure is pressed onto the array substrate, the second auxiliary electrode 27 in the cover structure can contact the top electrode 43 of the array substrate, so as to reduce the resistance of the top electrode 43.

The embodiment of the present disclosure also provides a display device, which may include the display panel described in the foregoing embodiment. The display device can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, notebook computer, digital photo frame, navigator, etc.

The above are only exemplary implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, and they should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

This application claims the priority of the Chinese patent application No. 201910372058.1 filed on May 6, 2019, and the content of the above-mentioned Chinese patent application is quoted here in full as a part of this application.

Claims

A cover structure includes:

A color film unit, the color film unit including a packaging cover plate, a black matrix and a color film layer formed on the packaging cover plate, and a flat layer covering the black matrix and the color film layer; and

Auxiliary electrode unit, the auxiliary electrode unit includes a first spacer formed on a position of the flat layer corresponding to the black matrix, a first auxiliary electrode covering the first spacer, formed on the first spacer A second spacer on an auxiliary electrode and corresponding to the first spacer, and a second auxiliary electrode covering the second spacer.
The cover structure according to claim 1, wherein:

A groove is formed on the surface of the first spacer column facing away from the color filter unit, the groove wall of the groove is covered with the first auxiliary electrode, and the groove wall includes a groove side wall and a groove bottom wall; and

The second spacer is disposed in the groove, and the height of the second spacer is greater than the depth of the groove.
3. The cover structure according to claim 2, wherein the second spacer is seamlessly attached to the first auxiliary electrode covered on the groove wall of the groove.
The cover structure according to claim 3, wherein:

The height of the first spacer is 5 μm to 10 μm, the depth of the groove is 4 μm to 8 μm, and the height of the second spacer is 5 μm to 10 μm.
The cover structure according to claim 1, wherein:

The first spacer and the second spacer are made of photoresist resin material.
The cover structure according to claim 1, wherein:

The first auxiliary electrode and the second auxiliary electrode are made of metal conductive material, indium zinc oxide or indium tin oxide.
The cover structure according to claim 1, wherein:

The sum of the thickness of the first auxiliary electrode and the second auxiliary electrode is 10 nm to 100 nm.
The cover structure according to claim 1, wherein:

The orthographic projection of the first spacer on the packaging cover is located in the orthographic projection of the black matrix on the packaging cover.
The cover structure according to claim 1, wherein:

There are a plurality of said auxiliary electrode units,

The first auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure, the whole-layer electrode structure also covering the flat layer; and/or

The second auxiliary electrodes of the auxiliary electrode units are connected to form a whole-layer electrode structure, and the whole-layer electrode structure also covers each of the first auxiliary electrodes.
A method for manufacturing a cover structure includes:

Forming a color filter unit, the color filter unit including a packaging cover plate, a black matrix and a color filter layer formed on the packaging cover plate, and a flat layer covering the black matrix and the color filter layer;

Forming a first spacer column on a position of the flat layer corresponding to the black matrix;

Forming a first auxiliary electrode covering the first spacer;

Forming a second spacer corresponding to the first spacer on the first auxiliary electrode; and

Forming a second auxiliary electrode covering the second spacer.
10. The manufacturing method according to claim 10, wherein after forming a first spacer on a position of the flat layer corresponding to the black matrix, and before forming a first auxiliary electrode covering the first spacer ,Also includes:

Forming a groove on the surface of the first spacer that faces away from the color filter unit;

Wherein, the groove is configured to accommodate the second spacer column, and the height of the second spacer column is greater than the groove depth of the groove.
A display panel including:

An array substrate, the array substrate includes a base substrate, a pixel defining layer formed on the base substrate, an organic light-emitting function layer formed on the pixel defining layer, and a top layer formed on the organic light-emitting function layer. electrode;

The cover structure according to any one of claims 1 to 9, wherein the auxiliary electrode unit is opposite to the position where the pixel defining layer is located, and the second auxiliary electrode is in contact with the top electrode.
A display device, comprising the display panel of claim 12.