CN111146350A - Display panel, preparation method thereof and ink-jet printing equipment - Google Patents
Display panel, preparation method thereof and ink-jet printing equipment Download PDFInfo
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- CN111146350A CN111146350A CN201911295914.4A CN201911295914A CN111146350A CN 111146350 A CN111146350 A CN 111146350A CN 201911295914 A CN201911295914 A CN 201911295914A CN 111146350 A CN111146350 A CN 111146350A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting 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
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
Abstract
The invention discloses a display panel, a preparation method thereof, the display panel and an ink-jet printing device, wherein the display panel comprises a substrate, a plurality of functional film layers arranged above the substrate, wherein the plurality of functional film layers include at least one positioning functional film layer, the positioning functional film layer includes a first region and a second region located around the first region, the positioning functional film layer located in the first region and the positioning functional film layer located in the second region have different light reflectivity and/or thickness and/or resistance, the first region and the second region of each positioning functional film layer are respectively overlapped in projection on the substrate, the structure of the display panel can help the spray head to be positioned on the positioning function film layer in the process of preparing the display panel by the ink-jet printing process, and the display panel has a better printing effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method of the display panel and ink-jet printing equipment.
Background
At present, the functional film layer in the display panel is mainly formed by an evaporation method and an inkjet printing method. The evaporation method is mature in preparing the small-sized display panel, but an FMM (high-precision metal mask) is needed, the process is complex and high in cost, and the ink-jet printing method is simple in film forming process and low in cost, but the problems that the printing position of the material to be subjected to ink-jet printing is deviated and the thickness of a functional film layer is uneven exist.
Disclosure of Invention
The embodiment of the invention aims to provide a display panel, a preparation method thereof and an ink-jet printing device, so as to solve the problems of deviation of printing positions of functional materials and uneven thickness of functional film layers in ink-jet printing.
A first aspect of the present invention provides a display panel comprising: the substrate is arranged above the substrate, the functional film layers comprise at least one positioning functional film layer, the positioning functional film layer comprises a first area and a second area located around the first area, the positioning functional film layer located in the first area is different from the positioning functional film layer located in the second area in light reflectivity, thickness and/or resistance, and projections of the first area and the second area of each positioning functional film layer on the substrate are respectively overlapped.
In an embodiment of the invention, in the display panel provided in the first aspect of the invention, the first area is located in the center of the positioning functional film layer
In an embodiment of the display panel, in the display panel provided by the first aspect of the present invention, an area of the first region accounts for no more than 20% of an area of the surface of the positioning functional film layer away from the substrate.
In an embodiment of the present invention, in the display panel provided in the first aspect of the present invention, a light reflectivity of the positioning function film layer located in the first area is less than a light reflectivity of the positioning function film layer located in the second area and/or a thickness of the positioning function film layer located in the first area is less than a thickness of the positioning function film layer located in the second area and/or a resistance of the positioning function film layer located in the first area is less than a resistance of the positioning function film layer located in the second area. .
In an embodiment of the display panel provided in the first aspect of the present invention, the positioning function film layer is an anode layer, a hole transport layer, a hole blocking layer, a light emitting layer, an electron transport layer, an electron blocking layer, or a cathode layer.
A second aspect of the present invention provides an inkjet printing apparatus for manufacturing a display panel, comprising: the shower nozzle, the shower nozzle is equipped with one or more in light intensity sensor, laser sensor, non-contact resistance tester.
A third aspect of the present invention provides a method for manufacturing a display panel, including: providing a substrate, and preparing a first functional film layer on the substrate, wherein the first functional film layer comprises a first area and a second area, and the first area and the second area have different light reflectivity and/or thickness and/or resistance; ink-jet printing a second functional film layer on the surface of the first functional film layer, which is far away from the substrate, wherein the step of ink-jet printing the second functional film layer on the surface of the first functional film layer, which is far away from the substrate, comprises the steps of acquiring the light reflection intensity and/or thickness and/or resistance of the first functional film layer in the first area and the functional film layer in the second area through a sprayer with a sensor, and positioning the sprayer above the first area to prepare the second functional film layer; the sensor is one or more of a light intensity sensor, a laser sensor and a non-contact resistance tester.
In an embodiment of the invention, in the above manufacturing method provided by the fourth aspect of the invention, the head has an optical intensity sensor, and the step of performing inkjet printing on the surface of the first functional film layer, which is away from the substrate, to print the second functional film layer includes determining the position of the first region after sensing the intensity of the reflected light of the first region and the reflected light of the second region by the optical intensity sensor and comparing the sensed intensities, and positioning the head above the first region.
In an embodiment of the invention, in the above manufacturing method provided by the third aspect of the invention, the head has a laser sensor, and the step of inkjet printing a second functional film layer on the surface of the first functional film layer away from the substrate includes determining the position of the first region and positioning the head above the first region by sensing the distance between the surfaces of the first region and the second region and the head by the laser sensor and comparing the distances.
In an embodiment of the invention, in the above manufacturing method provided by the third aspect of the invention, the head has a non-contact resistance tester, and the step of ink-jet printing a second functional film layer on the surface of the first functional film layer away from the substrate includes determining the position of the first area and positioning the head above the first area after sensing and comparing the resistances of the first area and the second area by the non-contact resistance tester.
The invention has the following beneficial effects:
in the display panel and the manufacturing method thereof, and the inkjet printing apparatus provided by the embodiment of the invention, at least one positioning function film layer of the display panel has a first area and a second area with different light reflectivity and/or thickness and/or resistance, the first area is surrounded by the second area, and the first area and the second area of each positioning function film layer are projected and overlapped on the substrate, in the process of manufacturing the display panel by using the inkjet printing process, because the light reflectivity and/or thickness and/or resistance of the positioning function film layer positioned in the first area and the second area are not consistent, the reflected light passing through the different areas of the positioning function film layer, the distance between the positioning function film layer and the nozzle or the resistance between the positioning function film layer and the nozzle can be sensed by the nozzle with the sensor, and the position of the first area is determined according to the intensity of the reflected light positioned on the surface of the positioning function film layer, the distance between the positioning function film layer, thereby with the accurate first region top of fixing a position of shower nozzle to treat that the inkjet printing material prints to locate function rete top, avoid treating the inkjet printing material and print the position and take place the deviation, further set up the center that the first region of locate function rete is located the locate function rete, the material ink droplet that is favorable to the inkjet to print is from locate function rete center toward diffusion all around, make the material bed thickness homogeneity after the inkjet is printed, better display effect has.
Drawings
Fig. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the invention.
Fig. 2 is a second schematic cross-sectional view of a display panel according to an embodiment of the invention.
Fig. 3 is a process diagram of a manufacturing method of a display panel according to an embodiment of the present invention.
Fig. 4 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
At present, the functional film layer in the display panel is mainly formed by an evaporation method and an inkjet printing method. The evaporation method is well applied to the preparation of the small-size display panel, and the inkjet printing method is high in film forming speed and material utilization rate, so that the preparation of the large-size display panel can be realized, and the method is considered as an important method for realizing mass production of the large-size display panel. Generally, when a functional film layer is manufactured, a pixel defining layer is required to be manufactured on a substrate to define an area (a pixel unit area) where the functional film layer is located, and then the functional film layer is manufactured in the corresponding pixel unit area by using an inkjet printing process. However, in the process of preparing the functional film by using the inkjet printing process, functional film materials (ink droplets) ejected from a nozzle of the inkjet printing device are sprayed onto the pixel defining layer, so that the functional film materials cannot accurately enter the pixel unit area, and the ink droplets enter the adjacent pixel unit area, so that the functional film materials are mixed; on the other hand, since the ink drop cannot be accurately dropped into the right center of the pixel unit region, the ink drop cannot be spread from the center of the pixel unit region to the periphery, so that the functional film layer is not uniform. Accordingly, embodiments of the present invention provide a display panel to solve the above problems.
A display panel provided in the present application includes: the substrate, set up in a plurality of function retes of base plate top, wherein, a plurality of function retes include at least one location function rete, and the location function rete includes first region and is located first region second region all around, and the light reflectivity and/or thickness and/or the resistance that are located the location function rete in first region and the location function rete that is located the second region are different, and the first region and the projection of second region on the substrate of each location function rete overlap respectively. In the process of preparing the display panel by utilizing the ink-jet printing process, because the light reflectivity and/or the thickness and/or the resistance of the positioning function film layers positioned in the first area and the second area are not consistent, the reflected light passing through different areas of the positioning function film layers and the distance or the resistance between the reflected light and the spray head can be sensed by the spray head with the sensor, the position of the first area is determined according to the intensity of the reflected light on the surface of the positioning function film layer, the distance between the positioning function film layer and the spray head or the resistance of the positioning function film layer, so that the spray head is accurately positioned above the first area to print the material to be printed above the positioning function film layer, and the printing position of the material of the function film layer is prevented from being,
specifically, referring to fig. 1, an embodiment of the present application is illustrated by taking the positioning functional film as an anode layer. Fig. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the invention. In one embodiment of the present invention as shown in fig. 1, the positioning functional film of the display panel is specifically an anode layer 4, the first area of the positioning functional film is an area where a first anode layer 41 is located, the second area is an area where a second anode layer 42 is located, and the light emitting layer 5 is formed on the anode layer 4 by an inkjet printing method.
In other embodiments of the present invention, the positioning function film layer having the first region and the second region in the display panel may further be one or more of an anode layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and a cathode layer. For example, when the positioning function film layer of the display panel having the first area and the second area is the cathode layer, the quantum dot material layer may be formed on the positioning function film layer by inkjet printing. When the positioning function film layer of the display panel having the first region and the second region is the anode layer and the electron blocking layer, the hole blocking layer may be formed on the anode layer as the positioning function film layer by ink-jet printing, and the light-emitting layer may be formed on the electron blocking layer as the positioning function film layer by ink-jet printing. In addition, the functional film layer formed by ink-jet printing on the positioning functional film layer can also be a positioning functional film layer. For example, the light emitting layer is formed by ink-jet printing on the electron blocking layer as the positioning function film layer, and can be accurately positioned through the electron blocking layer, the light emitting layer at this time can also be the positioning function film layer, and also has a first region and a second region with different properties, and then the other function film layers are continuously ink-jet printed on the light emitting layer as the positioning function film layer, so that the effect of the invention can also be achieved. Therefore, the functional film layer to be formed by ink-jet printing and the positioning functional film layer can be specifically selected according to actual needs.
As shown in fig. 1, in one implementable embodiment, a display panel may include a substrate 1, a plurality of pixel definition layers 3 on the substrate, and pixel cells 2 between adjacent pixel definition layers 3, the pixel definition layers 3 defining pixel cell regions. Each pixel unit 2 includes an anode layer 4 and a light-emitting layer 5 stacked in this order on a substrate 1. The anode layer 4 includes a first anode layer 41 and a second anode layer 42 disposed around the first anode layer 41, the first anode layer 41 and the second anode layer 42 have different light reflectivity and/or different thickness and/or different resistance, and the light emitting material covers the first anode layer 41 and the second anode layer 42 to form the light emitting layer 5. The pixel unit in the present invention is a single light emitting pixel, and may be, for example, a red light emitting pixel, a green light emitting pixel, a blue light emitting pixel, and the like.
In the display panel provided by the embodiment of the invention, the first anode layer 41 and the second anode layer 42 with different light reflectivity and/or thickness and/or resistance are arranged, and the first anode layer 41 is surrounded by the second anode layer 42, in the process of preparing the light-emitting layer 5 by the inkjet printing process, because one or more of the light reflectivity, the thickness and the resistance of the first anode layer 41 and the second anode layer 42 are inconsistent, the reflected light of the anode layer 4, the distance between the anode layer 4 and the nozzle or the resistance of the anode layer 4 are sensed by the nozzle provided with a sensor, the position of the first anode layer 41 is determined according to the intensity of the reflected light on the surface of the anode layer 4, the distance between the anode layer and the nozzle or the resistance of the anode layer, so that the nozzle is accurately positioned above the first anode layer 41 to accurately print the light-emitting material to the pixel unit area to be filled, the color mixing of adjacent pixel units is avoided, the first anode layer 41 is further positioned in the center of the pixel unit area, and the light-emitting material ink drops can diffuse from the center of the pixel unit area to the periphery, so that the thickness of the light-emitting layer is uniform, and the display panel has a good display effect.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the surface area of the first anode layer 41 away from the substrate 1 is smaller than the surface area of the second anode layer 42 away from the substrate 1, and the ratio of the surface area of the first anode layer 41 away from the substrate 1 to the surface area of the anode layer 4 away from the substrate is not more than 20%, so as to avoid that the surface area of the first anode layer 41 away from the substrate is too large to cause the inkjet print head to deviate from the center of the first anode layer 41 too much during positioning, and the inkjet print head can be positioned inside the pixel unit 2 region, so as to prevent the light emitting material from dropping on the pixel defining layer, and improve the light emitting effect of the display panel.
Further, the ratio of the surface area of the first anode layer 41 far from the substrate to the surface area of the anode layer 4 far from the substrate is greater than or equal to 0.5% and not more than 5%, and the first anode layer 41 with a smaller surface area helps the nozzle to be positioned inside the pixel unit 2 region more accurately, and at the same time, the contact surface area between the first anode layer 41 and the second anode layer 42 is also reduced, and the influence of electrode partition on current transmission is reduced.
Specifically, the first anode layer 41 is located at the center of the pixel unit 2, and at this time, the inkjet printing head can be accurately located at the center of the pixel unit 2 area when being located, and at this time, the light-emitting material ink drops can be diffused from the center of the pixel unit area to the periphery, so that the thickness of the light-emitting layer is uniform, and the display panel has a better display effect.
In a specific implementation, in the display panel provided in an embodiment of the present invention, when the light emitting side of the display panel is the side of the light emitting layer 5 far away from the anode layer 4, the higher the light reflectance of the anode layer 4 is, the better the light emitting effect of the display panel is, and at this time, the light reflectance of the first anode layer 41 is smaller than that of the second anode layer 42, so that the anode layer 4 can have a large-area high reflection area, which is beneficial to improving the light emitting rate of the display panel. On the contrary, when the light-emitting side of the display panel is the side of the light-emitting layer 5 close to the anode layer 4, the smaller the light reflectivity of the anode layer 4 is, the better the light-emitting effect of the display panel is, and at this time, the light reflectivity of the first anode layer 41 is greater than that of the second anode layer 42, so that the anode layer 4 has a high reflection area with a smaller area, which is helpful for improving the light-emitting rate of the display panel. Therefore, the present invention does not limit the specific light reflectivity of the first anode layer 41 and the second anode layer 42, and can be selected according to practical situations.
Specifically, when the light reflectivity of the first anode layer 41 is smaller than the light reflectivity of the second anode layer 42, when the display panel is manufactured, the intensity of the reflected light of the first anode layer 41 and the second anode layer 42 can be obtained by the light intensity sensor on the nozzle and compared with a preset value set by the nozzle, where the preset value is greater than or equal to the intensity of the reflected light of the first anode layer 41 and smaller than the intensity of the reflected light of the second anode layer 42, and by comparing with the preset value, the anode layer whose value obtained by the light intensity sensor is less than or equal to the preset value is the first anode layer 41. On the contrary, when the light reflectivity of the first anode layer 41 is greater than the light reflectivity of the second anode layer 42, the intensity of the reflected light of the first anode layer 41 and the second anode layer 42 is obtained by the light intensity sensor on the showerhead and compared with the preset value set by the showerhead, the preset value is greater than the intensity of the reflected light of the second anode layer 42 and less than or equal to the intensity of the reflected light of the first anode layer 41, and the anode layer with the value greater than or equal to the preset value obtained by the light intensity sensor is the first anode layer 41 by comparing with the preset value.
In a specific implementation, in the display panel provided in an embodiment of the present invention, the first anode layer 41 and the second anode layer 42 are made of materials with different light reflectances. For example, the first anode layer 41 may be made of ITO, IZO or other transparent electrode material with low light reflectivity, and the second anode layer 42 may be made of Mo, Al, Ag, Ti or other metal material with high light reflectivity. Similarly, the materials used for the first anode layer 41 and the second anode layer may be interchanged, so long as the light reflectivity therebetween is not the same.
Further, when the first anode layer 41 and the second anode layer 42 are transparent electrodes made of the same material, a silver-based reflective layer (not shown) may be disposed on a side of the first anode layer 41 or the second anode layer 42 close to the substrate, so that the light reflectivity of the first anode layer 41 and the second anode layer 42 is not uniform, which can better help positioning of the inkjet print head. For example, a silver-based reflective layer may be disposed on the second anode layer 42 near the substrate 1, and in this case, the area of the second anode layer 42 is large, so that the display panel can have a large-area high-reflection region, and the light extraction effect is better.
In practical implementation, in the display panel provided in an embodiment of the present invention, the thicknesses of the first anode layer 41 and the second anode layer 42 are different, as shown in fig. 2. In the preparation of the display panel, an inkjet printing apparatus having a laser sensor provided in the head is used, and the distances between the heads and the first and second anode layers 41 and 42 can be measured by the laser sensor and compared, and the first anode layer 41 is located according to the difference in the distances between the heads and the first and second anode layers 41 and 42, so as to accurately position the heads over the first anode layer 41. Specifically, the thickness of the first anode layer 41 is smaller than that of the second anode layer 42, a groove is formed in the middle of the anode layer 4, at this time, the distance between the surface of the first anode layer 41 far from the substrate and the nozzle, which is obtained by the laser sensor on the nozzle, and the nozzle is smaller than the distance between the surface of the second anode layer 42 far from the substrate and the nozzle, and then the comparison is performed with a preset value set by the nozzle, the preset value is greater than or equal to the distance between the surface of the first anode layer 41 far from the substrate and the nozzle, and is smaller than the distance between the surface of the second anode layer 42 far from the substrate and the nozzle, by comparing with the preset value, the anode layer, which is obtained by the laser sensor and is smaller than or equal to the preset value, is the first anode layer 41, when the nozzle is positioned at the groove for performing the inkjet printing of the, the luminous effect can be effectively improved. It should be noted that, in the embodiment provided in the present invention, when the surfaces of the first anode layer 41 and the second anode layer 42 far from the substrate are not flush, the distance between the nozzle and the anode layer is the distance between the surface of the anode layer far from the substrate and the nozzle, and when the surfaces of the first anode layer 41 and the second anode layer 42 far from the substrate are flush, the distance between the nozzle and the anode layer is the distance between the surface of the anode layer close to the substrate and the nozzle, so the distance between the nozzle and the anode layer sensed by the laser sensor may be specifically set according to specific situations, and is not specifically limited in the embodiment of the present invention.
Preferably, the thickness of the first anode layer 41 is equal to or greater than half the thickness of the second anode layer 42 and equal to or less than 2/3 the thickness of the second anode layer, and the thicknesses of the first anode layer 41 and the second anode layer 42 are set according to the relationship, so that the difference in thickness between the first anode layer 41 and the second anode layer can be within the sensitivity range of the laser sensor on the inkjet print head, and on the other hand, the smaller difference in thickness between the anode layers has less influence on the display effect of the display panel.
Similarly, the thickness of the first anode layer 42 may be higher than that of the first anode layer 41, and thus, in the embodiment of the present invention, the relationship between the thicknesses of the first anode layer 41 and the second anode layer 42 is not particularly limited.
In another embodiment of the present invention, in a display panel, the resistance of the first anode layer 41 is different from the resistance of the second anode layer 42, and when a non-contact resistance measuring device is installed in an inkjet printing head, the resistance of the first anode layer 41 and the resistance of the second anode layer 42 are measured and compared to determine the position of the first anode layer 41, so as to accurately position the inkjet head above the first anode layer 41. Specifically, when the resistance of the first anode layer 41 is smaller than that of the second anode layer 42, the non-contact resistance measuring instrument on the nozzle compares the resistance of the first anode layer 41 and the resistance of the second anode layer 42 with a preset resistance value set by the nozzle after obtaining the resistance of the first anode layer 41 and the resistance of the second anode layer 42, the preset value is smaller than the resistance of the second anode layer 42 and is greater than or equal to the resistance of the first anode layer 41, and the anode layer with the resistance smaller than or equal to the preset value is the first anode layer 41 by comparing with the preset value, so that the conditions required for positioning the nozzle for inkjet printing can be met, the conductivity of the anode layer 4 is not affected, and the display panel has.
The anode layer in the above embodiments is only used for specific illustration, and is not a limitation to the display panel positioning function layer in the present invention, and the anode layer in the above embodiments may be replaced by one or more of a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, or a cathode layer.
Fig. 3 is a schematic diagram of a printing process performed by the inkjet printing apparatus according to an embodiment of the present invention. In one embodiment of the present invention as shown in fig. 3, the positioning functional film of the display panel is specifically the anode layer 4, the first region of the positioning functional film is the region where the first anode layer 41 is located, the second region is the region where the second anode layer 42 is located, and the light emitting layer 5 is formed by ink-jet printing on the positioning functional film.
In other embodiments of the present invention, the positioning functional film of the display panel may not be limited to the anode layer, and may be a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, or a cathode layer. Therefore, the functional film layer to be formed by ink-jet printing and the positioning functional film layer can be specifically selected according to actual needs.
In one practical embodiment, the ink jet printing apparatus includes a nozzle 6, and a device capable of acquiring the properties of the anode layer 4 of the display panel provided by the embodiment of the present invention is installed on the nozzle 6. For example, the inkjet head 6 is mounted with a light intensity sensor (not shown), and the position of the first anode layer 41 can be determined according to the difference between the light reflection intensities of the first anode layer 41 and the second anode layer 42, so that the inkjet head 6 of the inkjet printing apparatus is positioned above the first anode layer 41, so as to realize accurate landing of the ink drop 5 of the inkjet printing on the position of the first anode layer 41. Similarly, other sensing devices, such as a laser sensor for measuring distance and a non-contact resistance detector for detecting resistance, may be mounted on the nozzle 6, and the specific positioning manner is set forth in the foregoing embodiments and will not be repeated here.
Fig. 4 is a flowchart illustrating a process of a method for manufacturing a display panel according to an embodiment of the present invention. In an embodiment of the present invention as shown in fig. 4, the positioning functional film of the display panel is specifically the anode layer 4, the first area of the positioning functional film is the area where the first anode layer 41 is located, the second area is the area where the second anode layer 42 is located, and the light emitting layer 5 is formed by inkjet printing on the positioning functional film.
In other embodiments of the present invention, the positioning function film layer having the first region and the second region in the display panel may further be one or more of an anode layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and a cathode layer. Various other implementation manners that can be implemented have been set forth in the foregoing embodiments and will not be described herein again.
As shown in fig. 4, the method of manufacturing the display panel may include the following steps.
Step 110: providing a substrate, preparing pixel defining layers on the substrate, and forming a pixel unit area between the pixel defining layers;
step 120: and preparing an anode layer in the pixel unit area, wherein the anode layer comprises a first anode layer and a second anode layer surrounded by the first anode layer.
Step 130: and spraying a luminescent material on the anode layer by adopting an ink-jet printing process to form a luminescent layer.
In the preparation method provided by the embodiment of the invention, in the process of preparing the light emitting layer of the display panel by adopting an ink jet printing process, the first anode layer 41 and the second anode layer 42 with different light reflectivity and/or thickness and/or resistance are arranged, and the first anode layer 41 is surrounded by the second anode layer 42, in the process of preparing the light emitting layer 5 by adopting the ink jet printing process, because the light reflectivity, the thickness or the resistance of the first anode layer 41 and the second anode layer 42 are inconsistent, the reflected light of the anode layer, the distance between the anode layer and the nozzle or the resistance of the anode layer are sensed by the nozzle provided with a sensor, the position of the first anode layer 41 is determined according to the intensity of the reflected light on the surface of the anode layer, the distance between the anode layer and the nozzle or the resistance of the anode layer, so that the nozzle is accurately positioned above the first anode layer 41 to accurately print the light emitting material to the pixel unit, the color mixing of adjacent pixel units is avoided, the first anode layer 41 is further positioned in the center of the pixel unit area, and the light-emitting material ink drops can diffuse from the center of the pixel unit area to the periphery, so that the thickness of the light-emitting layer is uniform, and the display panel has a good display effect. .
In the manufacturing method provided by the embodiment of the present invention, when the first anode layer 41 and the second anode layer 42 are manufactured in the pixel unit in step 120, the light reflectivity of the manufactured first anode layer 41 and the second anode layer 42 is different, and the specific light reflectivity defining manner of the first anode layer 41 and the second anode layer 42 is stated in the foregoing embodiments and will not be repeated here. Specifically, when the light reflectivity of the first anode layer 41 is smaller than the light reflectivity of the second anode layer 42, the intensity of the reflected light of the first anode layer 41 and the second anode layer 42 is obtained by the light intensity sensor on the showerhead and compared with a preset value set by the showerhead, where the preset value is greater than or equal to the intensity of the reflected light of the first anode layer 41 and less than the intensity of the reflected light of the second anode layer 42, and the anode layer with the value less than or equal to the preset value obtained by the light intensity sensor is the first anode layer 41 by comparing with the preset value. On the contrary, when the light reflectivity of the first anode layer 41 is greater than the light reflectivity of the second anode layer 42, the intensity of the reflected light of the first anode layer 41 and the second anode layer 42 is obtained by the light intensity sensor on the showerhead and compared with the preset value set by the showerhead, where the preset value may be greater than the intensity of the reflected light of the second anode layer 42 and less than or equal to the intensity of the reflected light of the first anode layer 41, and the anode layer with the value greater than or equal to the preset value obtained by the light intensity sensor is the first anode layer 41 by comparing with the preset value.
Further, in the step 120, when the first anode layer 41 and the second anode layer 42 are prepared in the pixel unit, and when the first anode layer 41 and the second anode layer 42 are transparent electrodes, a silver-based reflective layer may be prepared on a side of the first anode layer 41 or the second anode layer 42 close to the substrate, so that the light reflection intensities of the first anode layer 41 and the second anode layer 42 are inconsistent, and the positioning of the inkjet-printed nozzle can be better facilitated.
In the manufacturing method provided by the embodiment of the invention, in the step 120, when the first anode layer 41 and the second anode layer 42 are manufactured in the pixel unit, the thicknesses of the manufactured first anode layer 41 and the second anode layer 42 are different. When the inkjet-printed head 6 is equipped with a laser sensor, the distances between the first anode layer 41 and the second anode layer 42 and the head 6 can be measured by the laser sensor, and the first anode layer 41 can be located according to the difference between the distances between the first anode layer 41 and the second anode layer 42 and the head, so as to accurately position the head 6 above the first anode layer 41. Specifically, the thickness of the first anode layer 41 is smaller than that of the second anode layer 42, a groove is formed in the middle of the anode layer 4, at this time, the distance between the surface of the first anode layer 41 far from the substrate and the nozzle, which is obtained by the laser sensor on the nozzle, and the nozzle is smaller than the distance between the surface of the second anode layer 42 far from the substrate and the nozzle, and then the comparison is performed with a preset value set by the nozzle, where the preset value is greater than or equal to the distance between the surface of the first anode layer 41 far from the substrate and the nozzle, and is smaller than the distance between the surface of the second anode layer 42 far from the substrate and the nozzle, and by comparing with the preset value, the anode layer, which is obtained by the laser sensor and is smaller than or equal to the preset value, is the first anode layer 41, when the nozzle 6 is positioned at the groove to perform the inkjet printing of the luminescent material, the luminous effect can be effectively improved. It should be noted that, in the embodiment provided in the present invention, when the surfaces of the first anode layer 41 and the second anode layer 42 far from the substrate are not flush, the distance between the nozzle and the anode layer is the distance between the surface of the anode layer far from the substrate and the nozzle, and when the surfaces of the first anode layer 41 and the second anode layer 42 far from the substrate are flush, the distance between the nozzle and the anode layer is the distance between the surface of the anode layer close to the substrate and the nozzle, so the distance between the nozzle and the anode layer sensed by the laser sensor may be specifically set according to specific situations, and is not specifically limited in the embodiment of the present invention.
In the manufacturing method provided by the embodiment of the invention, in the step 120, when the first anode layer 41 and the second anode layer 42 are manufactured in the pixel unit 2, the resistance of the first anode layer 41 is different from the resistance of the second anode layer 42, and when the inkjet head 6 for inkjet printing is equipped with a non-contact resistance tester, the resistance of the first anode layer 41 and the resistance of the second anode layer 42 are measured and compared, and the position of the first anode layer 41 is determined, so that the inkjet head is accurately positioned above the first anode layer 41. Specifically, since the area of the first anode layer 41 is smaller than that of the second anode layer 42, the resistance of the first anode layer 41 may be smaller than that of the second anode layer 42, and at this time, the non-contact resistance measuring instrument on the nozzle compares the resistance of the first anode layer 41 and the resistance of the second anode layer 42 with a preset resistance value set by the nozzle after obtaining the resistance of the first anode layer 41 and the resistance of the second anode layer 42, where the preset resistance value is smaller than that of the second anode layer 42 and is greater than or equal to that of the first anode layer 41, and the anode layer having the resistance smaller than or equal to the preset value is the first anode layer 41 by comparing with the preset value, at this time, the conditions required for positioning the nozzle for inkjet printing can be met, and.
In the preparation method provided by the embodiment of the present invention, in step 130, the luminescent material 7 is sprayed on the anode layer 4 by using an inkjet printing process, and the nozzle 6 is located right above the first anode layer 41 when the luminescent material 7 is sprayed, as shown in fig. 3. Inkjet printing may use different nozzles 6 depending on the anode layer 4 prepared in step 120.
In the preparation method provided by the embodiment of the present invention, when the inkjet head adopting the inkjet printing in step 130 uses the inkjet head 6 mounted with the light intensity sensor, the beam spot area of the emergent light of the light intensity sensor is smaller than or equal to the area of the first anode layer 41, so that the inkjet head 6 can be accurately positioned right above the first anode layer 41, and the luminescent material 7 can be completely positioned inside the pixel unit during the inkjet printing, thereby preventing the luminescent material from dropping on the pixel defining layer or in the adjacent pixel unit.
In the preparation method provided by the embodiment of the invention, the step 130 adopts the inkjet printing nozzle 6 which is provided with a non-contact surface resistance tester. The working principle of the non-contact surface resistance tester is that a magnetic field is generated by Eddy Current (also called induced Current) by using the testing principle of the Eddy Current, when the magnetic field is contacted with a conductive material, Eddy Current is induced in the material, and the surface resistance (square resistance) of the material can be calculated according to the Current magnitude of the induced Eddy Current. Specifically, the nozzles 6 with different sensitivities can be selected according to the difference in the resistance between the first anode layer 41 and the second anode layer 42, the sensitivity ranges of the nozzles 6 for measuring the resistance can be selected from 5 to 100000(Ohms/sq), 0.5 to 10000(Ohms/sq), 0.05 to 1000(Ohms/sq) and 0.005 to 100(Ohms/sq), and the nozzles 6 with the corresponding sensitivity can be selected according to specific conditions.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A display panel, comprising:
the substrate is arranged above the substrate, the functional film layers comprise at least one positioning functional film layer, the positioning functional film layer comprises a first area and a second area located around the first area, the positioning functional film layer located in the first area is different from the positioning functional film layer located in the second area in light reflectivity, thickness and/or resistance, and projections of the first area and the second area of each positioning functional film layer on the substrate are respectively overlapped.
2. A display panel according to claim 1, characterized in that:
the first region is located in the center of the positioning functional film layer.
3. A display panel according to claim 1 or 2, characterized in that:
the area of the first region accounts for no more than 20% of the surface area of the positioning function film layer far away from the substrate.
4. A display panel according to claim 3, characterized in that:
the light reflectivity of the positioning function film layer in the first area is smaller than that of the positioning function film layer in the second area and/or the thickness of the positioning function film layer in the first area is smaller than that of the positioning function film layer in the second area and/or the resistance of the positioning function film layer in the first area is smaller than that of the positioning function film layer in the second area.
5. A display panel according to claim 1 or 2, characterized in that:
the positioning function film layer is an anode layer, a hole transmission layer, a hole blocking layer, a light emitting layer, an electron transmission layer, an electron blocking layer or a cathode layer.
6. An ink jet printing apparatus for producing the display panel according to claims 1 to 5, comprising:
the shower nozzle, the shower nozzle is equipped with one or more in light intensity sensor, laser sensor, non-contact resistance tester.
7. A preparation method of a display panel is characterized by comprising the following steps:
providing a substrate, and preparing a first functional film layer on the substrate, wherein the first functional film layer comprises a first area and a second area, and the first area and the second area have different light reflectivity and/or thickness and/or resistance;
ink-jet printing a second functional film layer on the surface of the first functional film layer, which is far away from the substrate, wherein the step of ink-jet printing the second functional film layer on the surface of the first functional film layer, which is far away from the substrate, comprises the steps of acquiring the light reflection intensity and/or thickness and/or resistance of the first functional film layer in the first area and the functional film layer in the second area through a sprayer with a sensor, and positioning the sprayer above the first area to prepare the second functional film layer; the sensor is one or more of a light intensity sensor, a laser sensor and a non-contact resistance tester.
8. The method for manufacturing a display panel according to claim 7, wherein:
the step of ink-jet printing the second functional film layer on the surface of the first functional film layer far away from the substrate comprises the steps of sensing the strength of reflected light of the first area and the second area through the light intensity sensor, comparing, determining the position of the first area, and positioning the spray head above the first area.
9. The method for manufacturing a display panel according to claim 7, wherein:
the step of performing ink-jet printing on the second functional film layer on the surface, far away from the substrate, of the first functional film layer comprises the steps of sensing the distance between the surfaces of the first area and the second area and the spray head through the laser sensor, comparing the distances, determining the position of the first area, and positioning the spray head above the first area.
10. The method for manufacturing a display panel according to claim 7, wherein:
the step of ink-jet printing the second functional film layer on the surface of the first functional film layer, which is far away from the substrate, comprises the steps of sensing the resistance of the first area and the second area through the non-contact resistance tester, comparing, determining the position of the first area, and positioning the spray head above the first area.
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