An inkjet printing apparatus, inkjet printing method and inkjet printing system

Abstract

This application provides an inkjet printing apparatus, comprising a printing chamber, an outer chamber, and a circulation system. The printing chamber is located within the outer chamber. The printing chamber is connected to the circulation system via a first piping assembly, the outer chamber is connected to the circulation system via a second piping assembly, and the printing chamber is connected to the outer chamber via a third piping assembly. A switch for opening or closing the piping is provided within the first piping assembly. This application also discloses an inkjet printing method and an inkjet printing system. This application solves the technical problem of uneven functional layer film formation caused by the formation of coffee-colored rings during inkjet printing, which affects device performance.

Description

Technical Field

[0001] This application relates to the field of inkjet printing technology, specifically to an inkjet printing apparatus, inkjet printing method, and inkjet printing system. Background Technology

[0002] Display technology has undergone several qualitative leaps, from early cathode ray tubes (CRTs) to liquid crystal displays (LCDs) and plasma display panels (PDPs) in the late 1980s, and now to the mainstream OLED (organic light-emitting diode) / QLED (quantum dot) displays. With the development of nanomaterials and equipment technologies, inkjet printing on rigid / flexible substrates for low-cost, large-area fabrication has become the most favored technology in OLED / QLED display technology.

[0003] In an inkjet printer, the printing chamber has a gas inlet pipe and a gas outlet pipe connected outside. When the chamber is working, the circulation system is activated, and the gas in the chamber removes water and oxygen by passing through purification materials (including activated carbon and molecular sieves) in the circulation system. At the same time, it also adsorbs the solvent that evaporates from the printing ink. From a printing perspective, we want to remove only water and oxygen, and keep the solvent that evaporates from the printing ink in the chamber so that it is not adsorbed. When enough printing ink evaporates to reach the saturated vapor pressure of the solvent, the ink that is printed next will not evaporate. This is very beneficial to our device fabrication. Currently, the time required to print a functional layer in device fabrication is about 3-10 minutes. With the circulation system working, a lot of ink has already evaporated at the edge of the substrate, while the middle part has not evaporated much, resulting in the formation of coffee rings (uneven functional layer film formation), which greatly reduces the performance of the device. Summary of the Invention

[0004] This application provides an inkjet printing device that at least solves the technical problem of uneven functional layer film formation caused by the formation of coffee rings during inkjet printing, which affects device performance.

[0005] To achieve the above objectives, the inkjet printing apparatus provided in this application includes a printing chamber, an external chamber, and a circulation system; the printing chamber is located inside the external chamber, the printing chamber is connected to the circulation system through a first pipeline assembly, the external chamber is connected to the circulation system through a second pipeline assembly, and the printing chamber is connected to the external chamber through a third pipeline assembly; the first pipeline assembly is provided with a switch for opening or closing the pipeline.

[0006] Optionally, the first piping assembly includes a first air inlet pipe and a first air outlet pipe, and the printing chamber forms a circulation loop with the circulation system through the first air inlet pipe and the first air outlet pipe; a first valve and a second valve are respectively provided in the first air inlet pipe and the first air outlet pipe.

[0007] Optionally, the second piping assembly includes a second air inlet pipe and a second air outlet pipe, and the external chamber forms a circulation loop with the circulation system through the second air inlet pipe and the second air outlet pipe.

[0008] Optionally, the third piping assembly includes a third air inlet pipe and a third air outlet pipe, and the printing chamber forms a circulation loop with the external chamber through the third air inlet pipe and the third air outlet pipe.

[0009] Optionally, valves are provided in the second piping assembly and the third piping assembly.

[0010] Optionally, the circulation system includes a water and oxygen removal device; the water and oxygen removal device is used to reduce the water and oxygen levels in the printing chamber and the external chamber.

[0011] To achieve the above objectives, this application also provides an inkjet printing method, wherein the inkjet printing method employs the inkjet printing apparatus described above, and the inkjet printing method includes the following steps:

[0012] Close the first piping assembly and open the second piping assembly and the third piping assembly;

[0013] The solvent of the ink used to print the functional film material to be printed in the printing chamber forms an ink solvent atmosphere;

[0014] Ink is used to print the functional film material to be printed, and the functional film is prepared.

[0015] Optionally, before the step of closing the first tubing assembly and opening the second and third tubing assemblies, the inkjet printing method further includes:

[0016] Open the first piping assembly and the second piping assembly, and purge the printing chamber and the external chamber with inert gas to reduce the water oxygen level in the printing chamber and the external chamber.

[0017] Optionally, after opening the first tubing assembly and the second tubing assembly, purging the printing chamber and the external chamber with inert gas, and before closing the first tubing assembly and opening the second tubing assembly and the third tubing assembly, the inkjet printing method further includes:

[0018] Open the first piping assembly and the second piping assembly and close the third piping assembly; use the circulation system to further reduce the water oxygen level in the printing chamber and the external chamber;

[0019] The step of forming an ink solvent atmosphere by using the solvent of the ink for printing the functional film material to be printed in the printing chamber is as follows:

[0020] The ink solvent is used to print the functional film material to be printed in the printing chamber until the printing chamber reaches the saturated vapor pressure of the ink solvent, thus forming the ink solvent atmosphere.

[0021] To achieve the above objectives, this application also provides an inkjet printing system, which includes a plurality of printing devices connected in sequence, wherein the printing devices are inkjet printing devices as described above.

[0022] In the technical solution proposed in this application, the inkjet printing device includes a printing chamber, an external chamber, and a circulation system. The printing chamber is located inside the external chamber. The printing chamber is connected to the circulation system via a first piping assembly, the external chamber is connected to the circulation system via a second piping assembly, and the printing chamber is connected to the external chamber via a third piping assembly. The first piping assembly is equipped with a switch for opening or closing the piping. By setting up a double-layered chamber and independent purification piping, a sealed external chamber is added outside the original printing chamber. When the water and oxygen values ​​in both the printing chamber and the external chamber drop to the target value, the circulation in the printing chamber is closed, and only the circulation in the external chamber is opened. When the printing ink is added and evaporates to the saturated vapor pressure of the solvent, it stops evaporating, thereby suppressing the formation of coffee rings, improving the film uniformity of the functional layer, and greatly improving the performance of the device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the inkjet printing device of this application;

[0025] Figure 2 This is a schematic diagram of the structural connection relationship of the inkjet printing device of this application;

[0026] Figure 3 This is a schematic diagram of the inkjet printing system of this application.

[0027] Explanation of icon numbers:

[0028]

[0029]

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0034] This application provides an inkjet printing device, which will be described in detail below.

[0035] Please see Figure 1 and Figure 2In this embodiment of the application, the inkjet printing device includes a printing chamber 10, an external chamber 40, and a circulation system 60; the printing chamber 10 is located inside the external chamber 40, the printing chamber 10 is connected to the circulation system 60 through a first pipeline assembly 20, the external chamber 40 is connected to the circulation system 60 through a second pipeline assembly 50, and the printing chamber 10 is connected to the external chamber 40 through a third pipeline assembly 30; the first pipeline assembly 20 is provided with a switch for opening or closing the pipeline.

[0036] It is understood that the printing chamber 10 includes the entire printing table (not shown) and the printing housing (not shown). The printing housing is externally connected to a first piping assembly 20 and a third piping assembly 30. The first piping assembly 20 is connected to the circulation system 60, so that the printing chamber 10 and the circulation system 60 form a gas circulation loop. The third piping assembly 30 enables the external chamber 40 to form a gas circulation loop with the printing chamber 10. The external chamber 40 is a sealed chamber, and the external chamber 40 forms a gas circulation loop with the circulation system 60 through the second piping assembly 50.

[0037] In the technical solution proposed in this application, by setting up a double-layer cavity and an independent purification pipeline, a sealed external cavity 40 is added outside the original printing cavity 10. When the water and oxygen values ​​of the printing cavity 10 and the external cavity 40 drop to the target value, the circulation of the printing cavity 10 is closed, and only the circulation of the external cavity 40 is opened. When the printing ink is added and evaporates to the saturated vapor pressure of the solvent, it stops evaporating, thereby inhibiting the formation of coffee rings, improving the film uniformity of the functional layer, and greatly improving the performance of the device.

[0038] Specifically, please refer to Figure 1 and Figure 2 In this embodiment, the first piping assembly 20 includes a first air inlet pipe 21 and a first air outlet pipe 22. The printing chamber 10 forms a circulation loop with the circulation system 60 through the first air inlet pipe 21 and the first air outlet pipe 22. A first valve 24 and a second valve 25 are respectively provided in the first air inlet pipe 21 and the first air outlet pipe 22. When the circulation system 60 is opened, the first valve 24 and the second valve 25 are opened, and the printing chamber 10 participates in the circulation. The purpose is to reduce the water oxygen value of the printing chamber 10 to the target value that meets the printing conditions.

[0039] Furthermore, the second piping assembly 50 includes a second air inlet pipe 51 and a second air outlet pipe 52. The external chamber 40 forms a circulation loop with the circulation system 60 through the second air inlet pipe 51 and the second air outlet pipe 52. When the circulation system 60 is opened, the first valve 24 and the second valve 25 are opened, and both the printing chamber 10 and the external chamber 40 participate in the circulation. The purpose is to simultaneously reduce the water and oxygen levels in the printing chamber 10 and the external chamber 40 to the target value that meets the printing conditions.

[0040] Furthermore, the third piping assembly 30 includes a third air inlet pipe 31 and a third air outlet pipe 32. The printing chamber 10 forms a circulation loop with the external chamber 40 through the third air inlet pipe 31 and the third air outlet pipe 32. When the water and oxygen levels in the printing chamber 10 and the external chamber 40 reach the target value, the first valve 24 and the second valve 25 are closed, and the printing chamber 10 does not participate in the circulation. Simultaneously, the third air inlet pipe 31 and the third air outlet pipe 32 are opened, and the printing chamber 10 is replenished with air through the third air inlet pipe 31. This replenishment is for the gas between the printing chamber 10 and the external chamber 40, and the third air outlet pipe 32 discharges the gas. It can be understood that the external chamber 40 is always in a circulation state, and the printing chamber 10 is protected by the external chamber 40, preventing water and oxygen from seeping in.

[0041] Furthermore, valves (not shown) are provided in the second pipeline assembly 50 and the third pipeline assembly 30. Specifically, valves are provided in the second air inlet pipe 51 and the second air outlet pipe 52, as well as in the third air inlet pipe 31 and the third air outlet pipe 32.

[0042] Furthermore, the circulation system 60 includes a water and oxygen removal device (not shown), which is used to reduce the water and oxygen levels in the printing chamber 10 and the external chamber 40. See also... Figure 2 In this embodiment, the circulation system 60 includes a solvent vapor removal tank 61, an oxygen vapor removal tank 62, a blower 63, and a heat exchanger 64 connected in sequence. The other end of the solvent vapor removal tank 61 is connected to the first outlet pipe 22 and the third outlet pipe 32, and the other end of the heat exchanger 64 is connected to the first inlet pipe 21 and the third inlet pipe 31. When the circulation system 60 is opened, the gas from the printing chamber 10 and the external chamber 40 enters the purification material in the circulation system 60, is purified, and then flows back into the printing chamber 10 and the external chamber 40. This cycle repeats continuously, maintaining the water and oxygen levels below the target value to facilitate printing.

[0043] This application also proposes an inkjet printing method, wherein the inkjet printing method employs the inkjet printing apparatus described in any of the above embodiments, and the inkjet printing method includes the following steps:

[0044] S1. Close the first pipeline assembly 20 and open the second pipeline assembly 50 and the third pipeline assembly 30;

[0045] S2. The solvent of the ink used to print the functional film material to be printed is used in the printing chamber 10 to form an ink solvent atmosphere;

[0046] S3. Prepare the functional film by printing the ink of the functional film material to be printed.

[0047] Furthermore, in this embodiment of the application, before step S1, the inkjet printing method further includes:

[0048] S0. Open the first pipeline assembly 20 and the second pipeline assembly 50, and clean the printing chamber 10 and the external chamber 40 with inert gas to reduce the water oxygen level in the printing chamber 10 and the external chamber 40.

[0049] Furthermore, in this embodiment of the application, after step S0 and before step S1, the inkjet printing method further includes:

[0050] S01. Open the first piping assembly 20 and the second piping assembly 50 and close the third piping assembly 30; use the circulation system 60 to further reduce the water oxygen level in the printing chamber 10 and the external chamber 40;

[0051] The step of forming an ink solvent atmosphere by using the solvent of the ink for printing the functional film material to be printed in the printing chamber 10 is as follows:

[0052] The ink solvent of the printing chamber 10 is used to print the functional film material to be printed until the printing chamber 10 reaches the saturated vapor pressure of the ink solvent, thus forming the ink solvent atmosphere.

[0053] Specifically, in step S0, the printing chamber 10 and the external chamber 40 are cleaned with an inert gas. In this embodiment, the inert gas is nitrogen. First, the first pipeline assembly 20 and the second pipeline assembly 50 are opened, and the printing chamber 10 and the external chamber 40 are cleaned with nitrogen. When cleaning the printing chamber 10, nitrogen enters the printing chamber 10 through the first air inlet pipe 21 and exits through the first air outlet pipe 22. When cleaning the external chamber 40, nitrogen enters the external chamber 40 through the second air inlet pipe 51 and exits through the second air outlet pipe 52. The cleaning continues until the water oxygen value in the printing chamber 10 and the external chamber 40 reaches less than 10 ppm, and then the cleaning is turned off.

[0054] Further, in step S01, after the water and oxygen values ​​in the printing chamber 10 and the external chamber 40 reach less than 10 ppm, the cleaning is turned off, and then the circulation system 60 is turned on; at this time, the first pipeline assembly 20 and the second pipeline assembly 50 are turned on, and the third pipeline assembly 30 is turned off, that is, the first valve 24 and the second valve 25 in the first air inlet pipe 21 and the first air outlet pipe 22 are turned on, and both the printing chamber 10 and the external chamber 40 participate in the circulation, the purpose of which is to reduce the water and oxygen values ​​in the printing chamber 10 and the external chamber 40 to less than 1 ppm.

[0055] Further, in step S1, after the water and oxygen levels in the printing chamber 10 and the external chamber 40 drop to less than 1 ppm, the first valve 24 and the second valve 25 are closed, and the printing chamber 10 does not participate in the circulation. Simultaneously, the third air inlet pipe 31 and the third air outlet pipe 32 are opened. The printing chamber 10 is replenished with air through the third air inlet pipe 31, which replenishes the gas between the printing chamber 10 and the external chamber 40. The third air outlet pipe 32 discharges the gas. It can be understood that the external chamber 40 is always in a circulation state, and the printing chamber 10 is protected by the external chamber 40, preventing water and oxygen from seeping in.

[0056] Furthermore, in step S2, printing ink is added to the printing chamber 10, and the ink is ejected to create a printing atmosphere, allowing the printing ink solvent to fill the entire printing chamber 10. Since the gas in the printing chamber 10 does not pass through the circulation system 60, the printing ink solvent atmosphere increases and gradually forms a printing ink solvent atmosphere.

[0057] Furthermore, in step S3, when the saturated vapor pressure of the printing ink solvent is reached, the printing ink no longer evaporates, and then the device fabrication begins.

[0058] Understandably, before printing, an ink solvent atmosphere is first formed in the printing chamber 10 to prevent the evaporation of the functional film solvent during printing, which is beneficial to uniform film formation. During printing, the external chamber 40 circulates inert gas to prevent water and oxygen from entering the printing chamber 10. At the same time, during printing, the solvent atmosphere and air pressure in the printing chamber 10 can be adjusted by adjusting the third air inlet pipe 31 and the third air outlet pipe 32 of the printing chamber 10 and the external chamber 40.

[0059] Please see Figure 3 This application also proposes an inkjet printing system, which includes a plurality of printing devices connected in sequence, wherein the printing devices are the inkjet printing devices described in any of the above embodiments.

[0060] Specifically, taking the fabrication of QLED light-emitting devices as an example, in the embodiments of this application, the inkjet printing system includes a first printing device 71, a second printing device 72, a third printing device 73, and a fourth printing device 74 connected in sequence. The first printing device 71, the second printing device 72, the third printing device 73, and the fourth printing device 74 are all inkjet printing devices in any of the above embodiments.

[0061] Furthermore, the fabrication method of the QLED light-emitting device includes the following steps:

[0062] S10. Prepare an ITO anode-formed substrate on the substrate;

[0063] S20. Using the first printing device 71, ink is printed on the ITO anode to prepare a hole injection layer;

[0064] S30. Using the second printing device 72, ink is printed on the hole injection layer to prepare the hole transport layer;

[0065] S40. Using the third printing device 73, ink is printed on the hole transport layer to prepare a quantum dot light-emitting layer;

[0066] S50. Using the fourth printing device 74, ink is printed on the quantum dot light-emitting layer to prepare an electron transport layer;

[0067] S60. Prepare a cathode on the electron transport layer.

[0068] Furthermore, after step S60, the method further includes:

[0069] S70. Prepare a photoextraction layer on the cathode;

[0070] S80, packaged, and the light-emitting device is obtained.

[0071] The present application will be specifically described below through specific embodiments. The following embodiments are only some embodiments of the present application and are not intended to limit the present application.

[0072] Example 1

[0073] The light-emitting device includes a substrate, an anode, a hole injection layer, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer, a cathode, and a light extraction layer, which are stacked sequentially.

[0074] The substrate is a glass substrate, and in step S10, an ITO anode is prepared on the glass substrate.

[0075] In step S20, a hole injection layer is prepared on the ITO anode. Specifically, a 200*200 ITO substrate is cleaned, dried, and UV-treated before being flowed into the printing chamber 10 of the first printing device 71 to print Mitsubishi HIL ink. After drying to form a film, it is annealed at 230°C for 30 minutes to form a hole injection layer with a thickness of 18nm.

[0076] In step S30, a hole transport layer is prepared on the hole injection layer. Specifically, the substrate is fed into the printing chamber 10 of the second printing device 72 to print crosslinked TFB ink. After drying to form a film, it is annealed at 200°C for 30 minutes to form a hole transport layer with a thickness of 22 nm.

[0077] In step S40, a quantum dot light-emitting layer is prepared on the hole transport layer. Specifically, the substrate is fed into the printing chamber 10 of the third printing device 73 to print CdSe@ZnS green quantum dot ink. After drying and forming a film, the temperature is pushed back to 100°C for 15 minutes to form a quantum dot light-emitting layer with a thickness of 15 nm.

[0078] In step S50, an electron transport layer is prepared on the quantum dot light-emitting layer. Specifically, the substrate is fed into the printing chamber 10 of the fourth printing device 74 to print ZnO ink. After drying to form a film, it is annealed at 120°C for 15 minutes to form an electron transport layer with a thickness of 70 nm.

[0079] In step S60, a cathode is prepared on the electron transport layer. Specifically, the substrate is fed into a vacuum evaporation device to deposit a Mg:Ag cathode, wherein Mg:Ag = 1:9, forming a cathode with a thickness of 25nm.

[0080] A photoextraction layer with a thickness of 60 nm is prepared on the cathode.

[0081] Specifically, the methods for printing ink by the first printing device 71 in step S20, the second printing device 72 in step S30, the third printing device 73 in step S40, and the fourth printing device 74 in step S50 are any of the inkjet printing methods described in the above embodiments.

[0082] Comparative Example 1

[0083] The difference from Example 1 is that in steps S20, S30, S40 and S50, a conventional printing device is used to print ink. The conventional printing device does not have an external chamber, and the printing chamber is in a continuous circulation state during the printing process.

[0084] The external quantum efficiency, current efficiency, and lifetime of the light-emitting devices of Example 1 and Comparative Example 1 were tested, and the results are shown in Table 1.

[0085] Table 1

[0086] Example 1 Comparative Example 1 External quantum efficiency (%) 17.6 11 Current efficiency (cd / A) 70.6 42.8 T80@1000nit(h) 1196 726

[0087] As can be seen from Example 1 and Comparative Example 1, the light-emitting device of Example 1 has higher external quantum efficiency and current efficiency, and a longer lifespan. This is because in this example, during the fabrication of the light-emitting device, the printing chamber 10 of each printing device does not participate in the circulation. The solvent in the printing chamber 10 remains in the printing chamber 10 after evaporation. As the solvent evaporates and reaches its saturated vapor pressure, it stops evaporating. The ink also stops evaporating during device fabrication, which can suppress the formation of coffee rings. In contrast, in Comparative Example 1, the solvent atmosphere in the printing chamber is adsorbed by the purification material entering the circulation system, thus failing to establish a good printing atmosphere. During the printing of the functional layer, the evaporation rate at the edge is greater than that at the center, resulting in the formation of coffee rings and significantly reducing the performance of the device.

[0088] The inkjet printing apparatus, inkjet printing method, and inkjet printing system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An inkjet printing method, characterized in that, Printing is performed using an inkjet printer, which includes a printing chamber, an outer chamber, and a circulation system. The printing chamber is located within the outer chamber. The printing chamber is connected to the circulation system via a first piping assembly, the outer chamber is connected to the circulation system via a second piping assembly, and the printing chamber is connected to the outer chamber via a third piping assembly. A switch for opening or closing the piping is provided within the first piping assembly. The inkjet printing method includes the following steps: Close the first piping assembly and open the second piping assembly and the third piping assembly; The solvent of the ink used to print the functional film material to be printed in the printing chamber forms an ink solvent atmosphere; Ink is used to print the functional film material to be printed, and the functional film is prepared. During inkjet printing, the external chamber circulates inert gas.

2. The inkjet printing method as described in claim 1, characterized in that, Prior to the step of closing the first tubing assembly and opening the second and third tubing assemblies, the inkjet printing method further includes: Open the first piping assembly and the second piping assembly, and purge the printing chamber and the external chamber with inert gas to reduce the water oxygen level in the printing chamber and the external chamber.

3. The inkjet printing method as described in claim 2, characterized in that, After opening the first tubing assembly and the second tubing assembly, purging the printing chamber and the external chamber with inert gas, and before closing the first tubing assembly and opening the second tubing assembly and the third tubing assembly, the inkjet printing method further includes: Open the first piping assembly and the second piping assembly and close the third piping assembly; use the circulation system to further reduce the water oxygen level in the printing chamber and the external chamber; The step of forming an ink solvent atmosphere by using the solvent of the ink for printing the functional film material to be printed in the printing chamber is as follows: The ink solvent is used to print the functional film material to be printed in the printing chamber until the printing chamber reaches the saturated vapor pressure of the ink solvent, thus forming the ink solvent atmosphere.

4. The inkjet printing method as described in claim 1, characterized in that, The first piping assembly includes a first air inlet pipe and a first air outlet pipe. The printing chamber forms a circulation loop with the circulation system through the first air inlet pipe and the first air outlet pipe. A first valve and a second valve are respectively provided in the first air inlet pipe and the first air outlet pipe.

5. The inkjet printing method as described in claim 1, characterized in that, The second piping assembly includes a second air inlet pipe and a second air outlet pipe, and the external chamber forms a circulation loop with the circulation system through the second air inlet pipe and the second air outlet pipe.

6. The inkjet printing method as described in claim 1, characterized in that, The third piping assembly includes a third air inlet pipe and a third air outlet pipe, and the printing chamber forms a circulation loop with the external chamber through the third air inlet pipe and the third air outlet pipe.

7. The inkjet printing method as described in claim 1, characterized in that, Valves are provided in the second pipeline assembly and the third pipeline assembly.

8. The inkjet printing method according to any one of claims 1-7, characterized in that, The circulation system includes a water and oxygen removal device, which is used to reduce the water and oxygen levels in the printing chamber and the external chamber.

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