CN113299702B - Display panel and preparation method thereof - Google Patents
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- CN113299702B CN113299702B CN202110501782.7A CN202110501782A CN113299702B CN 113299702 B CN113299702 B CN 113299702B CN 202110501782 A CN202110501782 A CN 202110501782A CN 113299702 B CN113299702 B CN 113299702B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H10K50/00—Organic light-emitting devices
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- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
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- H—ELECTRICITY
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- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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Abstract
The invention provides a display panel and a preparation method thereof. Wherein, the pixel definition layer has an at least laminating platform, and luminous functional layer covers the laminating platform and forms a laminating portion, and light takes out the layer and has bellied support column structure, and through the laminating portion that forms, the effectual laminating area that has improved between the rete to the height drop through light takes out the layer realizes the no version rendition of auxiliary electrode layer, thereby prevents the influence of external steam to display panel, has improved the encapsulation performance of panel, and improves the preparation technology of panel.
Description
Technical Field
The invention relates to the field of display panel manufacturing, in particular to a display panel and a preparation method of the display panel.
Background
With the continuous improvement of display panel manufacturing technology, higher requirements are put on the performance and quality of display panels.
A commonly used organic light-emitting diode (OLED) display device mainly includes a bottom emission type and a top emission type. Compared with a bottom-emitting OLED device, the top-emitting OLED device has the advantages of lower working voltage, longer service life, lower power consumption and the like under the same brightness. Therefore, the top emission type OLED display device is widely used. For the structure of the top-emitting OLED device, in order to improve various performances of the device, the cathode of the top-emitting OLED device is generally made of a low work function metal or an alloy material, and meanwhile, in order to avoid the influence of the cathode on the light extraction rate, the cathode layer is often made thinner, and the structure of the encapsulation layer is omitted. However, in the existing process technology, due to the characteristics of the preparation materials and the limitation of the film layer structure, after the packaging layer is omitted, the film layer structure cannot effectively prevent external substances such as water vapor from entering the panel, so that the packaging performance of the panel is invalid, and the service life of the display panel is reduced.
In summary, in the existing top emission OLED display panel, the devices in the display panel cannot effectively block external substances such as water vapor, and the like, so that the display panel is easily corroded by the outside to affect the service life of the panel.
Disclosure of Invention
The embodiment of the invention provides a display panel and a preparation method of the display panel, which are used for effectively improving the packaging performance of a top-emitting OLED display panel and preventing the problems that substances such as external water vapor enter the panel to influence the panel and the like.
In order to solve the above technical problem, the technical method provided by the embodiment of the present invention is as follows:
in a first aspect of embodiments of the present invention, a display panel is provided, where the display panel includes:
an array substrate;
a pixel defining layer disposed on the array substrate, the pixel defining layer including an opening region and a non-opening region adjacent to the opening region;
the light-emitting functional layer is arranged on the array substrate and covers the pixel defining layer;
a cathode layer covering the light emitting function layer;
an auxiliary electrode layer disposed on the cathode layer and correspondingly disposed in the non-open region; and the number of the first and second groups,
a cover plate disposed over the cathode layer;
the pixel definition layer corresponding to the non-opening area is provided with at least one attaching platform, the attaching platform is arranged along the side surface of the pixel definition layer towards the center of the pixel definition layer, and the light-emitting function layer covers the attaching platform and forms an attaching part.
According to an embodiment of the present invention, the display panel further includes a light extraction layer, the light extraction layer is disposed on the auxiliary electrode layer, the light extraction layer includes a support pillar structure and a micro lens structure, the support pillar structure is disposed in the non-opening region and correspondingly connected to the auxiliary electrode layer, the micro lens structure is disposed at a position corresponding to the opening region, and a height of the micro lens structure is smaller than a height of the support pillar.
According to an embodiment of the present invention, the auxiliary electrode layer includes a first auxiliary electrode layer and a second auxiliary electrode layer, the second auxiliary electrode layer is disposed on the first auxiliary electrode layer, and the first auxiliary electrode layer is disposed on the cathode layer.
According to an embodiment of the present invention, the materials of the first auxiliary electrode layer and the second auxiliary electrode layer are the same, and the materials of the first auxiliary electrode layer and the second auxiliary electrode layer include a conductive ink containing water absorbing particles.
According to an embodiment of the present invention, the pixel defining layer has a slope, and a ratio of a distance from the attaching platform to a bottom of the pixel defining layer to a distance from a top of the pixel defining layer to the attaching platform is between 1 and 15.
According to an embodiment of the present invention, the thickness of the pixel defining layer is between 1um and 10um, a slope formed between the edge of the attaching platform and the array substrate is greater than 30 ° and less than 60 °, and a slope formed between the edge of the attaching platform and the top of the pixel defining layer is greater than 30 ° and less than 60 °.
According to a second aspect of the present invention, there is also provided a method for manufacturing a display panel, comprising the steps of:
s100: providing an array substrate, and preparing a pixel definition layer on the array substrate;
s101: carrying out patterning etching treatment on the pixel defining layer, forming an opening region and a non-opening region on the pixel defining layer, and forming at least one attaching platform on the corresponding pixel defining layer in the non-opening region, wherein the attaching platform is arranged along the side surface of the pixel defining layer towards the center of the pixel defining layer;
s102: preparing a luminous function layer on the pixel definition layer, enabling the luminous function layer to cover the attaching platform and form an attaching part, and preparing a cathode layer on the luminous function layer;
s103: preparing a first auxiliary electrode layer on the cathode layer, wherein the first auxiliary electrode layer is arranged at a position corresponding to the non-opening area;
s104: providing a cover plate, and preparing a light extraction layer on the cover plate, wherein the light extraction layer comprises support pillar structures which are arranged at positions corresponding to the non-opening regions;
s105: preparing a second auxiliary electrode layer on the support pillar;
s106: and bonding and curing the first auxiliary electrode layer and the second auxiliary electrode layer.
According to an embodiment of the present invention, in the step S104 and the step S106, the first auxiliary electrode layer and the second auxiliary electrode layer are prepared by a plate-less transfer process, specifically:
s200: providing a transfer roller, preparing conductive ink containing water-absorbing particles on the transfer roller, and enabling the conductive ink to form a transfer film layer on the transfer roller;
s201: and transferring the transfer film layer onto the cathode layer and the support pillar structure, and forming the first auxiliary electrode layer and the second auxiliary electrode layer.
According to an embodiment of the present invention, during the plateless transfer process, when the first auxiliary electrode layer and the second auxiliary electrode layer are formed by transfer, a transfer pressure of the transfer roller is controlled so that an amount of deformation of the first auxiliary electrode layer and the second auxiliary electrode layer during transfer is less than 10%.
According to an embodiment of the present invention, the method further comprises the following steps: and arranging water-blocking frame glue in the peripheral edge area of the cover plate, and pressing the first auxiliary electrode layer and the second auxiliary electrode layer to cure the water-blocking frame glue, the first auxiliary electrode layer and the second auxiliary electrode layer.
In summary, the embodiments of the present invention have the following beneficial effects:
the embodiment of the invention provides a display panel and a preparation method of the display panel, wherein at least one attaching platform is formed on a pixel defining layer of the display panel, a light-emitting function layer covers the attaching platform and forms an attaching part, a light-taking out layer is provided with a raised supporting column structure, the attaching area between film layers is effectively increased through the formed attaching part, and the plateless transfer printing of an auxiliary electrode layer is realized through the height difference of the light-taking out layer, so that the influence of external water vapor on the display panel is prevented, and the packaging performance of the panel is improved.
Drawings
The technical solution and other advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a flow chart of a process for manufacturing a display panel according to an embodiment of the present invention;
fig. 3 is a method for manufacturing a display panel provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a film structure of a display panel according to an embodiment of the present invention;
FIG. 6 is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic peripheral structure diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
With the continuous development of display panel preparation technology, people put forward higher requirements on the display performance, quality and reliability of a display device, the invention provides the display panel and the preparation method of the display panel, the display panel not only has good sealing performance, but also has simple preparation process, the resistance of a cathode in the panel is smaller, and the display panel has better comprehensive performance.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. The display area of the display panel includes a light-emitting area 116 and a non-light-emitting area 115, the light-emitting area 116 and the non-light-emitting area 115 can be arranged adjacently, and when the display panel emits light, light is emitted from the light-emitting area 116 to realize a display function.
The display panel includes an array substrate 100, an anode 113, and a pixel defining layer 10. The anode 113 is disposed on the array substrate 100, and the pixel defining layer 10 is disposed on the array substrate 100 in a patterned manner.
Specifically, the pixel defining layer 10 includes an opening region 111 and a non-opening region 112 on the array substrate 100, the opening region 111 and the non-opening region 112 are adjacently disposed, in the embodiment of the present invention, the opening region 111 corresponds to the light-emitting region 116 of the display panel, the non-opening region 112 corresponds to the non-opening region 112 of the display panel, and the pixel defining layer 10 forms a retaining wall structure in the non-opening region 112. Meanwhile, the anode 113 is disposed within the open region 111.
The display panel further includes a light emitting functional layer 103 and a cathode layer 104. Here, the light emitting function layer 103 is disposed on the pixel defining layer 10, the cathode layer 104 is disposed on the light emitting function layer 103, and the cathode layer 104 covers the pixel defining layer 10.
In the embodiment of the present invention, the light emitting functional layer 103 is connected to the anode 113 through the first light emitting functional layer 114, and the light emitting functional layer 103 is also connected to the cathode layer 104, so as to implement driving light emission of the display panel, where the cathode layer 104 in this embodiment is a surface cathode. When the light emitting function layer 103 emits light, light is emitted from the opening region 111 of the pixel defining layer 10 and is emitted from a position corresponding to the light emitting region 116 of the display panel, thereby realizing light emitting display of the display panel.
In the embodiment of the present invention, when the pixel definition layer 10 is disposed, the pixel definition layer 10 is disposed to have at least one attaching platform 1121, and the attaching platform 1121 is disposed along a side edge of the pixel definition layer 10 and extends to a center of the pixel definition layer 10, so that an attaching platform structure parallel to a bottom or top plane of the pixel definition layer 10 is formed in a middle portion of the pixel definition layer 10. Specifically, the attachment surface of the attachment platform 1121 in the present application may also form an angle with the top or bottom surface of the pixel definition layer 10. Because the pixel definition layer 10 in the embodiment of the present application is provided with the attaching platform 1121, when other films are disposed on the pixel definition layer 10, the films are closely attached to the attaching platform 1121, so that the attaching area between the films is increased, thereby effectively improving the encapsulation performance of the display panel and prolonging the service life of the panel.
In the embodiment of the present application, a layer of the attachment platform 1121 is taken as an example for description. A multi-layer attaching platform may be further disposed at the side of the pixel defining layer 10, which is not described in detail herein. When a layer of the attaching platform 1121 is provided, the attaching platform 1121 makes the pixel definition layer 10 form a structure of stacking stages. Such as a first hierarchy level 101 and a second hierarchy level 102.
The second step layer 102 is disposed on the first step layer 101, and the first step layer 101 and the second step layer 102 may be prepared by multiple etching processes. And the cross-sectional area of the top of the first step layer 101 is larger than the cross-sectional area of the top of the second step layer 102.
The cross-sectional shapes of the first step layer 101 and the second step layer 102 may be trapezoidal or other shapes, and in the embodiment of the present invention, the trapezoidal shape is taken as an example for description. In order to ensure the adhesion effect of the light-emitting functional layer 103 and other film layers, the thickness of the pixel definition layer 10 is set to be between 1um and 10um, specifically, when the first step layer 101 and the second step layer 102 are arranged, the height of the first step layer 101 is h1, the height of the second step layer 102 is h2, and the ratio of the heights of h2/h1 is ensured to be between 0 and 15. If h2/h1 is equal to 0, this corresponds to the first stage 101 being provided. In the embodiment of the present invention, preferably, h2/h1 is 1 or h2/h1 is 5, so that the height ratio between the first step layer 101 and the second step layer 102 can be ensured to be more reasonable, further, other film structures on the second step layer 102 can be easier, and the problems of breakage of other film layers during transfer and transfer to the light emitting region can be effectively prevented.
Further, when the first step layer 101 and the second step layer 102 are disposed, a slope formed between the first step layer 101 and the surface of the array substrate 100 is α, and a slope formed between the second step layer 102 and the surface of the first step layer 101 is β, where β > α is ensured, and α is disposed between 30 ° and 60 °, and β is disposed between 30 ° and 60 °. And the sectional area of the bottom of the second step layer 102 is made smaller than the sectional area of the top of the first step layer 101.
Further, in the embodiment of the present application, the pixel defining layer 10 may be formed at one time, and after the forming is completed, the side of the pixel defining layer 10 is etched to finally form the structure of the flat surface in the present application. Or the pixel definition layers 10 are arranged in layers, so that the structure of the attaching plane in the embodiment of the present application is formed between the two pixel definition layers 10.
When the pixel definition layers 10 are arranged in a plurality of hierarchical structures, the step layers can provide a buffer zone, so that transfer ink is prevented from easily overflowing into the array substrate when other film layers are prepared by a plateless transfer process, and further certain influence is caused on the quality and reliability of the display panel. Accordingly, the reliability of the display panel is effectively improved, and the bonding platform 1121 is formed by providing the bonding platform 1121 between the first step 101 and the second step 102. Therefore, the light-emitting functional layer 103 can be tightly attached to the attachment platform 1121, and the light-emitting functional layer 103 forms an attachment portion with a folding structure on the attachment platform 1121, so that the contact area between the pixel definition layer 10 and the light-emitting functional layer 103 is increased, and when external substances such as water vapor enter the display panel along the film interface, the invasion path is lengthened. Therefore, the film layer attaching structure in the embodiment of the application effectively plays a role of an encapsulation layer and has a better encapsulation effect.
In the embodiment of the present invention, the display panel further includes an auxiliary electrode layer 11, the auxiliary electrode layer 11 is disposed on the cathode layer 104, and the auxiliary electrode layer 11 is disposed in the non-opening region 112. Specifically, the auxiliary electrode layer 11 includes a first auxiliary electrode layer 105 and a second auxiliary electrode layer 106, and the second auxiliary electrode layer 106 is disposed on the first auxiliary electrode layer 105. In addition, the electrode materials of the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 may be the same or different, in this embodiment of the present invention, the materials of the two auxiliary electrode layers are the same, and specifically, the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 may be formed by curing conductive ink containing water absorbing particles by a plate-less transfer method.
In the embodiment of the present invention, the nano silver particle ink is taken as an example for explanation, the auxiliary electrode layer material may also be other conductive inks, such as nano gold ink, nano copper ink, carbon nanotube ink, and the like, and in order to enhance the water and oxygen intrusion resistance of the auxiliary layer, metal oxide nanoparticles (group iia metal oxides, such as calcium oxide, barium oxide, and the like) may also be added to these conductive inks, so that the auxiliary layer has water absorption capability. When substances such as external water vapor enter the display panel, the materials such as the nano particles in the auxiliary electrode layer can adsorb the water vapor, so that the packaging performance of the display panel is improved, and the display quality of the display panel is ensured.
Preferably, the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 in the embodiment of the present invention are separately prepared, and then curing is performed between the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106, so as to finally form the structure of the auxiliary electrode layer 11 in the embodiment of the present invention. The auxiliary electrode layer 11 in the embodiment of the invention can not only reduce the resistance of the cathode layer in the display panel and reduce the voltage drop problem of the display panel, but also the auxiliary electrode layer 11 can adsorb substances such as external water vapor to a certain extent, thereby effectively improving the comprehensive performance of the display panel.
Further, the display panel further includes a light extraction layer 107 and a cover plate layer 108, the light extraction layer 107 being disposed on the auxiliary electrode layer 11, the cover plate layer 108 being disposed on the light extraction layer 107.
In order to improve the light extraction efficiency of the display panel, in the embodiment of the invention, when the light extraction layer 107 is disposed, the light extraction layer 107 includes the support pillar structure 109 and the first protrusion 110, and the first protrusion 110 in the embodiment of the invention is a microlens structure disposed in an array. The supporting column structures 109 are disposed in the regions corresponding to the non-opening regions 112, and the micro-lens structures are disposed at the positions corresponding to the opening regions 111. Moreover, the first protrusion 110 is provided with a plurality of micro-protrusion structures, and when light passes through the lens structure, the plurality of micro-lens protrusions can act on the light again to enlarge the emergent angle of the light, so that the emergent rate of the light of the display panel is effectively improved.
Specifically, when the light extraction layer 107 is disposed, the height of the support pillar structure 109 is greater than the height of the first protrusion 110 disposed in the non-opening region 112, so that it is ensured that the auxiliary electrode layer is transferred on the support pillar structure more easily, and the auxiliary electrode layer is prevented from being transferred into the opening region 111, thereby ensuring the performance of the display panel.
Preferably, the light extraction layer 107 is made of a material such as polysiloxane, the corresponding micro first protrusions 110 in the opening region 111 can be formed by an imprint method or a reactive ion etching method, and the cross-sectional shape of the support pillar structure 109 is trapezoidal, and the difference between the thickness of the support pillar structure 109 and the thickness of the first protrusions 110 in the light emitting region is 1um to 10 um.
Further, the embodiment of the invention also provides a preparation method of the display panel. As shown in fig. 2, fig. 2 is a flow chart of a manufacturing process of a display panel according to an embodiment of the present invention. The preparation method of the display panel comprises the following steps:
s100: providing an array substrate, and preparing a pixel definition layer on the array substrate;
s101: carrying out patterning etching treatment on the pixel defining layer, forming an opening region and a non-opening region on the pixel defining layer, and forming at least one attaching platform on the corresponding pixel defining layer in the non-opening region, wherein the attaching platform is arranged along the side surface of the pixel defining layer towards the center of the pixel defining layer;
as shown in fig. 3, fig. 3 is a method for manufacturing a display panel provided in the embodiment of the present invention. In the preparation of the display panel according to the embodiment of the present invention, an array substrate 100 is provided first, the array substrate 100 according to the embodiment of the present invention may be a thin film transistor array substrate, and the specific device design in the array substrate 100 is the same as the structure of the existing array substrate 100, which will not be described in detail herein.
Further, a pixel defining layer 10 and an anode 113 are prepared on the array substrate 100, wherein the pixel defining layer 10 covers the anode 113, and then the pixel defining layer 10 is subjected to a patterning etching process to form an opening region 111 and a non-opening region 112 adjacent to the opening region in the display panel, specifically, the pixel defining layer 10 forms the opening region 111 in a region corresponding to the anode 113, and the pixel defining layer 10 forms a retaining wall structure in the non-opening region 112, and exposes the anode 113, so that the anode 113 is connected to other films.
Specifically, in order to improve the manufacturing process, the pixel defining layer 10 may be a stacked film structure of multiple films. In the embodiment of the present invention, the pixel defining layer 10 includes a two-layer stacked structure as an example. The pixel definition layer 10 includes a mounting platform 1121, and the mounting platform 1121 forms the pixel definition layer 10 into a first step 101 and a second step 102, where the first step 101 and the second step 102 may be formed by etching the same pixel definition layer 10 for multiple times, or may be formed by forming different pixel definition layers 10 separately. The second step layer 102 is disposed on the first step layer 101, and the cross-sectional area of the bottom of the second step layer 102 is smaller than the cross-sectional area of the top of the first step layer 101, so that a plane is formed in the edge area of the top surface of the first step layer 101, and when other film layers are prepared on the pixel definition layer 10, the plane can effectively increase the contact area between the film layer and the pixel definition layer 10, thereby improving the adhesion and sealing effects of the film layer and improving the quality of the display panel.
In the embodiment of the present invention, the cross-sectional shapes of the first step layer 101 and the second step layer 102 are described by taking a trapezoidal shape as an example. In order to ensure the adhesion effect of the light-emitting functional layer 103 and other film layers, the thickness of the pixel definition layer 10 is set to be between 1um and 10um, specifically, when the first step layer 101 and the second step layer 102 are arranged, the height of the first step layer 101 is h1, the height of the second step layer 102 is h2, and the ratio of the heights of h2/h1 is ensured to be between 1 and 15. Preferably, h2/h1 is 1 or h2/h1 is 2.5, so that the height ratio of the first step layer 101 to the second step layer 102 can be ensured to be more reasonable, further, other film layer structures on the second step layer 102 can be easier, and the other film layers can be effectively prevented from being broken during transfer and being transferred into the light emitting region.
Further, when the first step layer 101 and the second step layer 102 are provided, a slope formed between the first step layer 101 and the surface of the array substrate 100 is α, and a slope formed between the second step layer 102 and the surface of the first step layer 101 is β, so that β > α is ensured, and α is provided between 30 ° and 60 ° and β is provided between 30 ° and 60 °, thereby effectively improving the reliability of the display panel.
S102: preparing a luminous function layer on the pixel definition layer, enabling the luminous function layer to cover the attaching platform and form an attaching part, and preparing a cathode layer on the luminous function layer;
s103: preparing a first auxiliary electrode layer on the cathode layer, wherein the first auxiliary electrode layer is arranged at a position corresponding to the non-opening region;
as shown in fig. 4, fig. 4 is a schematic view of a film structure of a display panel according to an embodiment of the present invention. After the pixel defining layer 10 is prepared, the light emitting function layer 103 is continuously prepared on the pixel defining layer 10, and the cathode layer 104 is simultaneously prepared on the light emitting function layer 103, wherein the light emitting function layer 103 is connected with the anode 113 through the first light emitting function layer 114.
In order to effectively reduce the resistance of the cathode layer 104 in the display panel, improve the driving voltage of the display panel and improve the performance of the panel. In the embodiment of the present invention, a first auxiliary electrode layer 105 is further prepared on the cathode layer 104, and the first auxiliary electrode layer 105 is disposed on the cathode layer 104 corresponding to the non-opening region 112.
When the first auxiliary electrode layer 105 is disposed, the first auxiliary electrode layer 105 is prepared by a plate-free transfer process, and since the pixel defining layer 10 is patterned on the array substrate 100 and the retaining wall structure is formed in the non-opening region 112, the first auxiliary electrode layer 105 can be directly disposed on the cathode layer 104 by using a plurality of protruding retaining walls during plate-free transfer, thereby effectively simplifying the production process and improving the production efficiency.
Specifically, the transfer process comprises the following steps:
s200: providing a transfer roller, preparing conductive ink containing water-absorbing particles on the transfer roller, and enabling the conductive ink to form a transfer film layer on the transfer roller;
s201: and transferring the transfer film layer onto the cathode layer and the support pillar structure, and forming the first auxiliary electrode layer.
Specifically, a transfer roller is provided, and the prepared auxiliary electrode layer material is coated on the transfer roller, and the transfer roller can be rotated at a constant speed during coating so as to ensure the uniform consistency of coating. And after the coating is finished, standing for a period of time, and finally forming a film layer to be transferred on the periphery of the transfer roller. In an embodiment of the present invention, the material of the transfer film layer may include a conductive ink containing water-absorbing particles, and specifically, the conductive ink may be a conductive gold ink, a conductive copper ink, a carbon nanotube ink, or the like. When the water absorption particles are contacted with water vapor and the like, the water vapor and other substances can be absorbed, so that the sealing effect of the display panel is effectively improved.
After the transfer film layer is prepared, the transfer roller is placed at a corresponding position above the cathode layer 104, and then the transfer roller is rotated forwards, so that the transfer roller is in contact with and pressed on the cathode layer 104 in the rotating process. During the transfer process, since the transfer film has adhesive properties, the transfer film is transferred to the surface of the cathode layer 104 during the contact process with the cathode layer 104, and a patterned first auxiliary electrode layer 105 is formed on the surface of the cathode layer 104. The transfer film layer not in contact with the cathode layer 104 still remains on the transfer roller, meanwhile, the pressure of the transfer roller is larger than the bonding energy between the transfer film layer and the surface of the transfer roller, and the deformation of the transfer film layer is ensured to be less than 10% when the transfer roller is transferred, the transfer pressure of the transfer roller is controlled, so that the transfer film layer can be separated from the transfer roller and can be adhered to the cathode layer 104, and in the transfer process, the deformation of the transfer film layer is ensured to be less than 10%. Therefore, the transfer printing film layer can be effectively ensured not to be collapsed during transfer printing and not to be transferred to the opening area of the display panel, and the reliability of the prepared display panel is ensured.
S104: providing a cover plate, and preparing a light extraction layer on the cover plate, wherein the light extraction layer comprises support pillar structures which are arranged at positions corresponding to the non-opening regions;
s105: preparing a second auxiliary electrode layer on the support pillar;
s106: and bonding and curing the first auxiliary electrode layer and the second auxiliary electrode layer.
After the above steps are completed, as shown in fig. 5, fig. 5 is a schematic view of a film structure of a display panel according to an embodiment of the present invention. A cover plate layer 108 is provided, and a light extraction layer 107 is prepared on the cover plate layer 108. In the embodiment of the present invention, when the light extraction layer 107 is prepared, the light extraction layer 107 includes the support pillar structures 109 and the first protrusions 110. Specifically, the supporting pillar structures 109 are disposed at positions corresponding to non-opening regions of the display panel, the first protrusions 110 are disposed at positions corresponding to opening regions of the display panel, the first protrusions 110 may be disposed on the light extraction layer 107 in an array, and heights of the first protrusions 110 may be the same or different, and may be specifically set according to actual products.
Meanwhile, on the light extraction layer 107, the thickness of the light extraction layer 107 corresponding to the non-open region is greater than the thickness of the light extraction layer 107 corresponding to the open region, so that the light extraction layer 107 forms a structure in which convexes and concaves are alternated.
After the light extraction layer 107 is arranged, a color resistance layer can be arranged in an opening area corresponding to the light extraction layer 107 so as to achieve the purpose of displaying different colors of emergent light, and when the color resistance layer is arranged, the height of the color resistance layer is smaller than that of the support pillar.
Further, a second auxiliary electrode layer 106 is formed on the light extraction layer 107. The material of the second auxiliary electrode layer 106 may be the same as or different from the material of the first auxiliary electrode layer 105, and in the embodiment of the present invention, the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 are the same electrode material as an example. Meanwhile, when the second auxiliary electrode layer 106 is prepared, a plateless transfer process is still employed for preparation, which is the same as the preparation process of the first auxiliary electrode layer 105 in step S104, and the preparation precautions when the second auxiliary electrode layer 106 is prepared are also the same as when the first auxiliary electrode layer 105, and therefore, will not be described in detail here.
Preferably, the thickness of the second auxiliary electrode layer 106 may be the same as that of the first auxiliary electrode layer 105.
After the second auxiliary electrode layer 106 is prepared, the first auxiliary electrode layer 105 is bonded to the second auxiliary electrode layer 106. Specifically, after the transfer is completed, the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 both have a certain adhesiveness, so that the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 can be attached to each other, and after the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 are attached and aligned, the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 are tightly pressed. Meanwhile, when the first auxiliary electrode layer 105 is connected with the second auxiliary electrode layer 106, a curing adhesive can be arranged between the two electrode layers, in the curing process, the two auxiliary electrode layers are bonded more easily through the ultraviolet curing adhesive, and finally the two auxiliary electrode layers can be tightly connected together, and after the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 are pressed together, the surface resistance of the cathode layer 104 is further improved.
As shown in fig. 6 and 7, fig. 6 and 7 are schematic top views of a display panel and a schematic peripheral structure of the display panel according to an embodiment of the present invention. Meanwhile, the structure of the display panel in fig. 1 is schematically shown. In the embodiment of the present invention, at least one circle of sealant 600 and a water blocking layer 601 are further disposed in the peripheral edge region of the cover plate layer 108, the sealant 600 can connect the cover plate layer 108 and the array substrate 100, and meanwhile, the water blocking layer 601 can effectively block external water vapor. Therefore, the display panel provided by the embodiment of the invention has a simpler preparation process, the water-blocking layer 601 can block external water vapor and the like, and the first auxiliary electrode layer 105 and the second auxiliary electrode layer 106 arranged in the display panel can also block and absorb the water vapor, so that the sealing performance of the display panel is effectively improved, and the reliability of the display panel is improved.
The display panel and the method for manufacturing the display panel provided by the embodiment of the invention are described in detail, a specific example is applied to illustrate the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display panel, comprising:
an array substrate;
a pixel defining layer disposed on the array substrate, the pixel defining layer including an opening region and a non-opening region adjacent to the opening region;
the light-emitting functional layer is arranged on the array substrate and covers the pixel defining layer;
a cathode layer covering the light emitting functional layer;
an auxiliary electrode layer disposed on the cathode layer and correspondingly disposed in the non-open region; and the number of the first and second groups,
a cover plate disposed over the cathode layer;
the pixel definition layer corresponding to the non-opening area is provided with at least one attaching platform, the attaching platform is arranged along the side surface of the pixel definition layer towards the center of the pixel definition layer, and the light-emitting function layer covers the attaching platform and forms an attaching part; wherein, water absorption particles are arranged in the auxiliary electrode layer.
2. The display panel according to claim 1, wherein the display panel further comprises a light extraction layer disposed on the auxiliary electrode layer, the light extraction layer comprises a support pillar structure and a micro-lens structure, the support pillar structure is disposed in the non-opening region and correspondingly connected to the auxiliary electrode layer, the micro-lens structure is disposed at a position corresponding to the opening region, and a height of the micro-lens structure is smaller than a height of the support pillar.
3. The display panel according to claim 1, wherein the auxiliary electrode layer comprises a first auxiliary electrode layer and a second auxiliary electrode layer, wherein the second auxiliary electrode layer is provided on the first auxiliary electrode layer, and wherein the first auxiliary electrode layer is provided on the cathode layer.
4. The display panel according to claim 3, wherein the first auxiliary electrode layer and the second auxiliary electrode layer are made of the same material, and wherein the material of the first auxiliary electrode layer and the material of the second auxiliary electrode layer comprise a conductive ink containing water absorbing particles.
5. The display panel of claim 1, wherein the pixel definition layer has a slope, and a ratio of a distance from the pasting platform to the bottom of the pixel definition layer to a distance from the top of the pixel definition layer to the pasting platform is between 1 and 15.
6. The display panel of claim 5, wherein the thickness of the pixel definition layer is between 1um and 10um, the slope formed between the edge of the bonding platform and the array substrate is greater than 30 ° and less than 60 °, and the slope formed between the edge of the bonding platform and the top of the pixel definition layer is greater than 30 ° and less than 60 °.
7. The preparation method of the display panel is characterized by comprising the following steps of:
s100: providing an array substrate, and preparing a pixel definition layer on the array substrate;
s101: carrying out patterning etching treatment on the pixel definition layer, forming an opening area and a non-opening area on the pixel definition layer, and forming at least one attaching platform on the corresponding pixel definition layer in the non-opening area, wherein the attaching platform is arranged towards the center of the pixel definition layer along the side surface of the pixel definition layer;
s102: preparing a luminous function layer on the pixel definition layer, enabling the luminous function layer to cover the attaching platform and form an attaching part, and preparing a cathode layer on the luminous function layer;
s103: preparing a first auxiliary electrode layer on the cathode layer, wherein the first auxiliary electrode layer is arranged at a position corresponding to the non-opening region;
s104: providing a cover plate, and preparing a light extraction layer on the cover plate, wherein the light extraction layer comprises support pillar structures which are arranged at positions corresponding to the non-opening regions;
s105: preparing a second auxiliary electrode layer on the supporting column, wherein water-absorbing particles are arranged in the first auxiliary electrode layer and the second auxiliary electrode layer;
s106: bonding and curing the first auxiliary electrode layer and the second auxiliary electrode layer, and obtaining the display panel according to any one of claims 1 to 6.
8. The method for manufacturing a display panel according to claim 7, wherein in the steps S103 and S105, the first auxiliary electrode layer and the second auxiliary electrode layer are manufactured by a plate-free transfer process, specifically:
s200: providing a transfer roller, preparing conductive ink containing water-absorbing particles on the transfer roller, and enabling the conductive ink to form a transfer film layer on the transfer roller;
s201: and transferring the transfer film layer onto the cathode layer and the support pillar structure, and forming the first auxiliary electrode layer and the second auxiliary electrode layer.
9. The method according to claim 8, wherein in the process of the plate-less transfer printing, when the first auxiliary electrode layer and the second auxiliary electrode layer are formed by transfer printing, the transfer pressure of the transfer roller is controlled so that the deformation amount of the first auxiliary electrode layer and the second auxiliary electrode layer in the transfer printing process is less than 10%.
10. The method for manufacturing a display panel according to claim 7, further comprising the steps of:
and arranging water-blocking frame glue in the peripheral edge area of the cover plate, pressing the first auxiliary electrode layer and the second auxiliary electrode layer, and curing the water-blocking frame glue, the first auxiliary electrode layer and the second auxiliary electrode layer.
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