Printing head processing method, printing equipment and printing method

Abstract

The invention belongs to the field of organic light-emitting device manufacturing, and relates to a printing head processing method which is characterized by comprising the following steps: injecting a soaking solvent into a printing head; determining the refractive index of the soaking solvent after soaking for a first preset time; and determining whether to stop soaking according to the refractive index of the soaking solvent. The invention further relates to printing equipment and a printing method. According to the technical scheme, the processing quality and processing efficiency of the printing head can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of organic light-emitting device manufacturing, and more specifically, to a print head processing method, a printing device, and a printing method. Background Art

[0002] OLED or QLED has the characteristics of self-luminescence, low power consumption, fast response, and can be used as flexible products, etc., and has been widely applied to commercial products, and the market share has been increasing year by year. Among them, inkjet printing technology is expected to be applied to the production of large-size OLED or QLED products. Inkjet printing technology has the advantages of simple process, high material utilization rate, and no need for high-precision metal mask (FMM). When the print head needs to update the ink material, the conventional method is to drain the ink in the original print head, soak it with a solvent, then drain the soaking solvent and inject new ink material.

[0003] According to the conventional ink replacement process, it is currently impossible to completely determine that all components such as the original ink material or solvent can be drained after one soaking. However, if the solvent is soaked or the new ink is rinsed multiple times, it will lead to an increase in production costs and a loss of labor and time costs. Summary of the Invention

[0004] Embodiments of the present application provide a print head processing method, a printing device, and a printing method.

[0005] Embodiments of the present application provide a print head processing method, which adopts the following technical solutions:

[0006] A print head processing method includes the following steps:

[0007] Inject a soaking solvent into the print head;

[0008] Determine the refractive index of the soaking solvent after soaking for a first preset time;

[0009] Determine whether to terminate the soaking according to the refractive index of the soaking solvent.

[0010] Further, the step of determining whether to terminate the soaking according to the refractive index of the soaking solvent specifically includes:

[0011] Analyze the refractive index of the soaking solvent to obtain an analysis value;

[0012] When the analysis value is within a preset allowable range, terminate the soaking;

[0013] Or, when the analysis value exceeds the preset allowable range, perform a soaking solvent replacement process.

[0014] Further, the analysis value includes a refractive index difference and a refractive index change value;

[0015] When the analyzed value is the refractive index difference, it refers to the absolute value of the difference between the refractive index after the immersion solvent is immersed for the first preset time and the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than 0.00001;

[0016] When the analyzed value is the refractive index change value, it refers to the ratio of the refractive index difference to the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than or equal to 10%;

[0017] Preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 5%;

[0018] More preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 3%.

[0019] Furthermore, after the step of determining whether to terminate the immersion according to the refractive index of the immersion solvent, the following steps are further included:

[0020] Using the immersion solvent obtained when terminating the immersion to prepare an organic light-emitting device, denoted as a test device;

[0021] Optionally, the test device is prepared through the following operation steps:

[0022] Providing an anode layer; disposing the immersion solvent on the anode layer to form an auxiliary film; preparing a functional layer on the auxiliary film; and preparing a cathode layer on the functional layer to form a test device; wherein, the functional layer includes at least one of a hole functional layer, a light-emitting layer, and an electron functional layer, the hole functional layer includes a hole injection layer and a hole transport layer, and the electron functional layer includes an electron injection layer and an electron transport layer.

[0023] Furthermore, when the print head is used to prepare the hole injection layer, the auxiliary film is located between the anode layer and the hole injection layer;

[0024] Or, when the print head is used to prepare the hole transport layer, the auxiliary film is located between the hole injection layer and the hole transport layer;

[0025] Or, when the print head is used to prepare the light-emitting layer, the auxiliary film is located between the light-emitting layer and the hole functional layer or between the light-emitting layer and the electron functional layer;

[0026] Or, when the print head is used to prepare the electron transport layer, the auxiliary film is located between the electron transport layer and the electron injection layer;

[0027] Or, when the print head is used to prepare the electron injection layer, the auxiliary film is located between the cathode layer and the electron injection layer.

[0028] Further, after the step of using the soaking solvent obtained when terminating the soaking to prepare an organic light-emitting device, denoted as the test device, the following steps are further included: providing a standard device, and detecting the device performance of the test device and / or the device performance of the standard device, including the following steps:

[0029] Detecting the optical performance of the test device and / or the standard device through a current-voltage-luminance (IVL) detection device;

[0030] And / or, detecting the service life of the test device and / or the standard device through a life aging device;

[0031] Optionally, after the step of detecting the device performance of the test device and / or the device performance of the standard device, the following steps are further included: calculating the difference value between the device performance of the test device and the device performance of the standard device; if the difference between the device performance of the test device and the device performance of the standard device is ≤ 5%, then the processing of the print head is completed; or, if the difference between the device performance of the test device and the device performance of the standard device is > 5%, then a new soaking solvent is injected into the print head for re-soaking.

[0032] The embodiment of the present application further provides a printing device, which adopts the following technical solutions:

[0033] A printing device, the printing device includes an analysis and processing device and an ink replacement mechanism;

[0034] Wherein, the analysis and processing device includes a detection mechanism and an analysis mechanism, and the analysis mechanism is connected to the detection mechanism;

[0035] The detection mechanism is used to extract and detect the soaking solvent to obtain the refractive index of the soaking solvent;

[0036] The analysis mechanism is used to analyze the refractive index of the soaking solvent to obtain an analysis value and judge whether the analysis value is within a preset allowable range;

[0037] The ink replacement mechanism is used to perform soaking solvent replacement processing when the analysis value exceeds the preset allowable range.

[0038] Further, the detection mechanism includes an ink storage device, and the ink storage device is used to store the ink to be printed or the soaking solvent;

[0039] And / or, the detection mechanism further includes a printing device, and the printing device is used to perform inkjet printing when the analysis value is within the preset allowable range;

[0040] And / or, the detection mechanism further includes an ink detection chamber and a refractive index detection component;

[0041] The ink detection chamber is used to receive the soaking solvent extracted from the ink storage device;

[0042] The refractive index detection component is used to detect the refractive index of the soaking solvent in the ink detection chamber.

[0043] Furthermore, the analysis value includes a refractive index difference and a refractive index change value;

[0044] When the analysis value is the refractive index difference, it refers to the absolute value of the difference between the refractive index of the soaking solvent after soaking for the first preset time and the original refractive index of the soaking solvent, and the corresponding preset allowable range is less than 0.00001;

[0045] When the analysis value is the refractive index change value, it refers to the ratio of the refractive index difference to the original refractive index of the soaking solvent, and the corresponding preset allowable range is less than or equal to 10%;

[0046] Preferably, when the detection value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 5%;

[0047] More preferably, when the detection value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 3%.

[0048] The embodiment of the present application also provides a printing method, adopting the following technical solution:

[0049] A printing method includes the following steps:

[0050] Empty the original ink in the print head;

[0051] Use the above-mentioned print head treatment method to determine that the original ink in the print head has been drained;

[0052] Empty the soaking solvent in the print head;

[0053] Inject the functional layer ink into the print head;

[0054] Control the print head to ink-jet print the functional layer ink onto the substrate to form a functional layer;

[0055] Optionally, before the step of injecting the functional layer ink into the print head, it further includes:

[0056] Use the functional layer ink as a flushing agent to flush the print head at least three times.

[0057] Compared with the prior art, the embodiment of the present application mainly has the following beneficial effects:

[0058] This application accurately determines whether the original ink in the print head has been completely drained by calculating the refractive index of the immersion solvent before and after immersion, ensuring the compliance of ink replacement in the print head and improving the ink replacement efficiency of the print head. Description of the Drawings

[0059] To more clearly illustrate the solution of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0060] Figure 1 is a flowchart of the print head processing method according to an embodiment of this application;

[0061] Figure 2 is a schematic structural diagram of a test device according to an embodiment of this application;

[0062] Figure 3 is a graph of the brightness-time relationship between a test device and a test device according to an embodiment of this application;

[0063] Figure 4 is a schematic structural diagram of a printing system according to an embodiment of this application;

[0064] Figure 5 is a flowchart of the printing method according to an embodiment of this application.

[0065] Reference Numerals:

[0066] 1. Anode layer; 2. Hole functional layer; 21. Hole injection layer; 22. Hole transport layer; 3. Auxiliary film; 4. Light-emitting layer; 5. Electron functional layer; 51. Electron transport layer; 52. Electron injection layer; 6. Cathode layer; 7. Printing system; 71. Memory; 72. Processor; 73. Network interface. Detailed Embodiments

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the embodiments of this application in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0068] References herein to "embodiments" mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0069] Embodiment of the print head processing method of the present application

[0070] Please refer to Figure 1 As shown, the embodiment of the present application provides a print head processing method, including the following steps:

[0071] Step S100, injecting a soaking solvent into the print head;

[0072] Step S200, determining the refractive index of the soaking solvent after soaking for a first preset time;

[0073] Step S300, determining whether to terminate soaking according to the refractive index of the soaking solvent.

[0074] The print head processing method provided by the embodiment of the present application can accurately judge whether the original ink in the print head has been completely processed through the change in the refractive index of the soaking solvent after soaking, ensure that the print head can meet the standard of ink replacement, and improve the ink replacement efficiency of the print head.

[0075] In some embodiments, step S100, injecting a soaking solvent into the print head, includes the following steps:

[0076] Discharging the original ink in the print head.

[0077] Injecting a soaking solvent into the print head until the soaking solvent completely fills the print head.

[0078] The embodiment of the present application fills the print head completely with the soaking solvent to prevent the original ink from adhering to the inner wall of the print head and improve the processing quality of the print head.

[0079] In some embodiments, in step S100, after the step of injecting a soaking solvent into the print head, ultrasonic treatment is performed on the print head, wherein the ultrasonic treatment uses an ultrasonic cleaning machine.

[0080] The ultrasonic frequency of the ultrasonic cleaning machine is 10 - 50 kHz. Specifically, the ultrasonic frequency of the ultrasonic cleaning machine can be set to any value or a range formed between any two values among 10 kHz, 20 kHz, 30 kHz, 40 kHz, and 50 kHz.

[0081] The ultrasonic time of the ultrasonic cleaner is 1 to 60 minutes. Specifically, the duration of ultrasonic treatment of the inkjet print head by the ultrasonic cleaner can be set to any value among 1 minute, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes or the range formed between any two values.

[0082] The ultrasonic temperature of the ultrasonic cleaner is 20 to 50 °C. Specifically, the temperature of ultrasonic treatment of the inkjet print head by the ultrasonic cleaner can be set to any value among 20 °C, 25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C or the range formed between any two values.

[0083] In other embodiments, after the step of injecting the soaking solvent into the inkjet print head, it may further include: performing a static treatment on the inkjet print head.

[0084] In some embodiments, the duration of the static treatment is 12 to 24 hours. Specifically, the duration of the soaking solvent staying static in the inkjet print head can be set to any value among 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, 24 hours or the range formed between any two values.

[0085] In some embodiments, the first preset time of soaking in step S200 is the first preset time of the above ultrasonic treatment or the first preset time of the static treatment.

[0086] In some embodiments, in step S200, the step of determining the refractive index of the soaking solvent specifically includes:

[0087] Detecting the original refractive index of the soaking solvent with a refractometer and recording it as n 0 ;

[0088] Detecting the refractive index of the soaking solvent obtained after soaking with a refractometer and recording it as n.

[0089] In other embodiments, the original refractive index n of the soaking solvent 0 can also be obtained according to the original data provided by the manufacturer.

[0090] In some embodiments, in step S300, the step of determining whether to terminate soaking according to the refractive index of the soaking solvent specifically includes:

[0091] Analyzing the refractive index of the soaking solvent to obtain an analysis value;

[0092] When the analyzed value is within the preset allowable range, the soaking is terminated;

[0093] Alternatively, when the analyzed value exceeds the preset allowable range, a soaking solvent replacement process is performed.

[0094] In some embodiments, the analyzed value includes a refractive index difference and a refractive index change value.

[0095] When the analyzed value is the refractive index difference, it refers to the absolute value of the difference between the refractive index of the soaking solvent after soaking for a first preset time and the original refractive index of the soaking solvent |n - n 0 |, and the corresponding preset allowable range is less than 0.00001.

[0096] When the analyzed value is the refractive index change value, it refers to the ratio of the refractive index difference to the original refractive index of the soaking solvent, and the corresponding preset allowable range is less than or equal to 10%.

[0097] In some embodiments, the refractive index change value Δn is calculated by the following formula:

[0098] Δn = (n - n 0 ) / n 0 .

[0099] This application calculates the refractive index change value through the refractive index of the soaking solvent before soaking and the refractive index of the soaking solvent obtained after soaking for the first preset time, so as to quickly determine whether the original ink in the print head has been processed, and improve the processing quality and efficiency of the print head.

[0100] In some embodiments, when the analyzed value is within the preset allowable range, that is, when Δn > 10% or |n - n 0 | ≥ 0.00001, it is considered that the print head has not been processed, and a soaking solvent replacement process is performed. Specifically: the soaked solvent after standing is taken out from the print head, and then new soaking solvent is injected into the print head for re-soaking;

[0101] In some embodiments, when the analyzed value exceeds the preset allowable range, that is, when Δn ≤ 10% and |n - n 0 | < 0.00001, the soaking is terminated, and the original ink in the print head has been drained.

[0102] In some embodiments, after injecting new soaking solvent into the print head for re-soaking and soaking for the first preset time, the refractive index change value Δn of the new soaking solvent is calculated again. When the refractive index change value Δn of the new soaking solvent reaches the target range, it is determined that the residual ink in the print head has been drained.

[0103] The print head processing method provided by the embodiment of the present application performs an immersion treatment on the print head by soaking it in a solvent to clean the original ink in the print head. By detecting the refractive index of the soaking solvent after soaking and calculating the change value of the refractive index of the soaking solvent, it is determined whether the original ink in the print head has been completely drained based on whether the refractive index change value reaches the target range, thereby improving the processing efficiency and quality of the print head.

[0104] As a preferred solution, when Δn ≤ 5%, and |n - n 0 | < 0.00001, stop soaking.

[0105] As a more preferred solution, when Δn ≤ 3% and |n - n 0 | < 0.00001, stop soaking.

[0106] In this embodiment, by analyzing the change amount Δn of the refractive index, the influence of the original ink on the soaking solvent is determined. When the original ink in the print head is completely drained, the original ink has no influence on the refractive index of the soaking solvent after soaking, that is, the original refractive index n 0 of the soaking solvent is basically the same as the refractive index n of the soaking solvent after soaking. In an ideal situation, the change amount of the refractive index will be close to zero.

[0107] In this embodiment, the influence of the original ink on the soaking solvent is further verified by the difference between the original refractive index of the soaking solvent and the refractive index of the soaking solvent after soaking. When the original ink in the print head is completely drained, the original ink has no influence on the soaking solvent, so the refractive index of the soaking solvent after soaking is basically unchanged from the original refractive index of the soaking solvent, that is, the difference between the original refractive index of the soaking solvent and the refractive index of the soaking solvent after soaking will be close to zero.

[0108] Therefore, when the refractive index change rate Δ of the soaking solvent ≤ 10% (more preferably, Δn ≤ 3%), and the difference |n - n 0 | < 0.00001 between the original refractive index of the soaking solvent and the refractive index of the soaking solvent after soaking, it can be determined that the original ink in the print head has been completely drained, and the processing of the print head is completed.

[0109] In other embodiments, if the change amount Δn of the refractive index of the soaking solvent > 10%, or the difference |n - n 0 | ≥ 0.00001 between the original refractive index of the soaking solvent and the refractive index of the soaking solvent after soaking, it is considered that the refractive index of the soaking solvent after standing does not reach the target range, and it is necessary to drain the soaking solvent in the print head and inject a new soaking solvent with the same material into the print head to re-perform the soaking and cleaning.

[0110] In the embodiments of the present application, by confirming the change amount of the refractive index of the immersion solvent after immersion, as well as the difference between the original refractive index of the immersion solvent and the refractive index of the immersion solvent after immersion, it is confirmed that the original ink has no effect on the refractive index of the immersion solvent after immersion, thereby improving the processing quality of the print head.

[0111] Please refer to Figure 1 As shown, in some embodiments, when the refractive index change rate Δn of the immersion solvent satisfies Δn ≤ 10%, and the difference |n - n 0 | < 0.00001, after the step S300 of determining whether to terminate the immersion according to the refractive index of the immersion solvent, the following steps are further included:

[0112] Step S400, using the immersion solvent obtained when terminating the immersion to prepare an organic light-emitting device, denoted as a test device.

[0113] In some embodiments, the test device is prepared through the following operating steps:

[0114] Provide an anode layer;

[0115] Set the immersion solvent on the anode layer to form an auxiliary film;

[0116] Prepare a functional layer on the auxiliary film;

[0117] Prepare a cathode layer on the functional layer to form a test device.

[0118] Among them, the functional layer includes at least one of a hole functional layer, a light-emitting layer, and an electron functional layer. The hole functional layer includes a hole injection layer and a hole transport layer, and the electron functional layer includes an electron injection layer and an electron transport layer.

[0119] In the present application, the print head can be used to prepare any one of the hole injection layer, the hole transport layer, the light-emitting layer, the electron injection layer, and the electron transport layer.

[0120] When the print head is used to prepare the hole injection layer, the auxiliary film is located between the anode layer and the hole injection layer.

[0121] When the print head is used to prepare the hole transport layer, the auxiliary film is located between the hole injection layer and the hole transport layer.

[0122] When the print head is used to prepare the light-emitting layer, the auxiliary film is located between the light-emitting layer and the hole functional layer or between the light-emitting layer and the electron functional layer.

[0123] When the print head is used to prepare the electron transport layer, the auxiliary thin film is located between the electron transport layer and the electron injection layer.

[0124] When the print head is used to prepare the electron injection layer, the auxiliary thin film is located between the cathode layer and the electron injection layer.

[0125] In this embodiment, taking the ink to be supplemented for preparing the light-emitting layer as an example for further illustration, the test device is prepared through the following steps:

[0126] Provide an anode layer.

[0127] Prepare a hole functional layer on the anode layer, wherein the hole functional layer includes a hole injection layer and a hole transport layer which are stacked.

[0128] Prepare an auxiliary thin film on the hole functional layer by using the immersion solvent.

[0129] Prepare a light-emitting layer on the auxiliary thin film.

[0130] Prepare an electron functional layer on the light-emitting layer.

[0131] Prepare a cathode layer on the electron functional layer.

[0132] Please refer to Figure 2 As shown, the top-emitting OLED device prepared in this embodiment through the above steps includes an anode layer 1, a hole injection layer 21, a hole transport layer 22, an auxiliary thin film 3, a light-emitting layer 4, an electron transport layer 51, an electron injection layer 52, and a cathode layer 6 which are stacked in sequence from bottom to top.

[0133] In some embodiments, the provided standard device includes an anode layer, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode layer which are stacked from bottom to top; in this embodiment, compared with the standard device, the test device provided in this embodiment adds an auxiliary thin film 3 located between the hole transport layer 22 and the light-emitting layer 4.

[0134] Since using a mixed ink for device preparation will reduce the performance of the light-emitting device, as Figure 3 shown, the service life of the OLED device is reduced. Therefore, by comparing the device performance of the test device and the standard device, the influence of the auxiliary thin film 3 on the device performance of the OLED device can be confirmed, and according to the device performance of the OLED device including the auxiliary thin film 3, it can be confirmed that there is a mixture of the original ink and the immersion solvent in the print head, so as to determine whether the print head has completed the treatment.

[0135] Please refer to Figure 1As shown, in some embodiments, after the step S400 of using the soaking solvent obtained when terminating soaking to prepare an organic light-emitting device, which is denoted as the step of testing the device, the following steps are further included:

[0136] Step S500: Provide a standard device, and detect the device performance of the test device and / or the device performance of the standard device. Specifically, it includes testing the optical performance and service life of the test device.

[0137] Among them, the optical performance of the test device and / or the optical performance of the standard device are detected by a current-voltage-luminance (IVL) detection device;

[0138] The service life of the test device and / or the service life of the standard device are detected by a life aging device.

[0139] In some embodiments, after step S500 of providing a standard device and detecting the device performance of the test device and / or the device performance of the standard device, the following steps are further included:

[0140] Step S600: Calculate the difference value between the device performance of the test device and the device performance of the standard device.

[0141] In this embodiment, the device performance includes the optical performance and service life of the device. Among them, the device performance of the test device is detected separately through the above steps. The optical performance of the standard device can be detected by a current-voltage-luminance (IVL) detection device, and can also be obtained from manufacturer data; the service life of the standard device can be detected by a life aging device, and can also be obtained from manufacturer data.

[0142] If the difference between the device performance of the test device and the device performance of the standard device is ≤ 5%, the processing of the print head is completed; or, if the difference between the device performance of the test device and the device performance of the standard device is > 5%, a new soaking solvent is injected into the print head for re-soaking.

[0143] In this embodiment, when the performance differences in the optical performance and service life of the test device compared with those of the standard device are both less than 5%, the processing of the print head is completed.

[0144] In other embodiments, when one of the performance differences in the optical performance and service life of the test device compared with those of the standard device is greater than or equal to 5%, it is considered that the original ink in the print head has not been drained completely, and it is necessary to drain the soaking solvent in the print head and inject a new soaking solvent into the print head for re-soaking.

[0145] The print head processing method provided by the embodiment of the present application detects the refractive index of the soaking solvent after standing. When the refractive index of the soaking solvent after standing reaches the target range, it is preliminarily determined that the original ink in the print head has been drained. The soaking solvent with a refractive index reaching the target range after soaking is used to prepare an organic light-emitting device as a test device together, and the device performance of the test device is detected. When the difference value between the device performance of the test device and the device performance of the standard device is within the first threshold, it is further determined that the original ink in the print head has been drained. Through the two detections of the soaking solvent after soaking, it is possible to accurately determine that the original ink in the print head has been drained, improving the processing quality and processing efficiency of the print head.

[0146] Based on the above print head processing method, the embodiment of the present application further provides a printing system. For details, please refer to Figure 4 , Figure 4 which is the basic structural block diagram of the printing system of this embodiment.

[0147] The printing system 7 includes a memory 71, a processor 72, and a network interface 73 that are communicatively connected to each other through a system bus. It should be noted that only the computer device 7 with components 71 to 73 is shown in the figure. However, it should be understood that it is not required to implement all the shown components, and more or fewer components can be implemented alternatively. Among them, those skilled in the art of the present technology can understand that a computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to a microprocessor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a digital signal processor (DSP), an embedded device, etc.

[0148] The memory 71 includes at least one type of readable storage medium, which includes flash memory, hard disk, multimedia card, card-type memory (such as SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disc, etc. In some embodiments, the memory 71 may be an internal storage unit of the computer device 7, such as the hard disk or memory of the computer device 7. In other embodiments, the memory 71 may also be an external storage device of the computer device 7, such as a plug-in hard disk, SmartMedia Card (SMC), Secure Digital (SD) card, FlashCard, etc. equipped on the computer device 7. Of course, the memory 71 may also include both the internal storage unit and the external storage device of the computer device 7. In this embodiment, the memory 71 is generally used to store the operating system and various application software installed on the computer device 7, such as the program code of the print head processing method. In addition, the memory 71 may also be used to temporarily store various data that have been output or will be output.

[0149] In some embodiments, the processor 72 may be a central processing unit (CPU), controller, microcontroller, microprocessor, or other data processing chip. The processor 72 is generally used to control the overall operation of the computer device 7. In this embodiment, the processor 72 is used to run the program code stored in the memory 71 or process data, such as running the program code of the print head processing method.

[0150] The network interface 73 may include a wireless network interface or a wired network interface, and the network interface 73 is generally used to establish a communication connection between the computer device 7 and other electronic devices.

[0151] Based on the above print head processing method, an embodiment of the present application further provides a printing device for executing the above print head processing method.

[0152] The printing device includes an analysis processing device and an ink replacement mechanism.

[0153] In some embodiments, the analysis processing device includes a detection mechanism and an analysis mechanism, and the analysis mechanism is connected to the detection mechanism;

[0154] The detection mechanism is used to extract and detect the immersion solvent to obtain the refractive index of the immersion solvent; the analysis mechanism is used to analyze the refractive index of the immersion solvent to obtain an analysis value and determine whether the analysis value is within a preset allowable range;

[0155] The ink replacement mechanism is used to perform an immersion solvent replacement process when the analysis value exceeds the preset allowable range.

[0156] In the embodiments of the present application, when the ink to be printed needs to be replaced, there are differences in the materials between the original ink and the ink to be printed. Therefore, if the ink to be printed is directly replaced, the residue of the original ink will cause problems to the ink to be printed, affecting the optical performance of the functional layer prepared subsequently. Therefore, before replacing the ink to be printed, the detection mechanism is used to extract and detect the immersion solvent, and based on the analysis value obtained by the analysis mechanism, the residual ink is determined to be drained, thereby ensuring the device performance of the light-emitting device prepared by the present application.

[0157] In some embodiments, the detection mechanism includes an ink storage device for storing the ink to be printed or the immersion solvent.

[0158] In some embodiments, the detection mechanism further includes a printing device for performing inkjet printing when the analysis value is within the preset allowable range.

[0159] In the present application, after injecting the immersion solvent into the ink storage device and soaking for a first preset time, the detection mechanism is used to detect the refractive index of the immersion solvent. Then, the analysis mechanism analyzes the refractive index of the immersion solvent to obtain an analysis value and determines whether the analysis value is within the preset allowable range; when the analysis value is within the preset allowable range, the soaking of the ink storage device by the immersion solvent is ended, and then the ink to be supplemented is injected for inkjet printing; when the analysis value exceeds the preset allowable range, a new round of soaking of the ink storage device is performed by injecting a new immersion solvent, so as to ensure that the original ink in the ink storage device is drained.

[0160] In some embodiments, the detection mechanism further includes an ink detection chamber and a refractive index detection component;

[0161] The ink detection chamber is used to receive the immersion solvent extracted from the ink storage device;

[0162] The refractive index detection component is used to detect the refractive index of the immersion solvent in the ink detection chamber.

[0163] In some embodiments, the analysis value includes a refractive index difference and a refractive index change value;

[0164] When the analysis value is the refractive index difference, it refers to the absolute value of the difference between the refractive index after the immersion solvent is immersed for the first preset time and the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than 0.00001;

[0165] When the analysis value is the refractive index change value, it refers to the ratio of the refractive index difference to the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than or equal to 10%;

[0166] Preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 5%;

[0167] More preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 3%.

[0168] When the analysis mechanism analyzes the analysis value, when the absolute value of the difference between the refractive index after the immersion solvent is immersed for the first preset time and the original refractive index of the immersion solvent is less than 0.00001 and the ratio of the refractive index difference to the original refractive index of the immersion solvent is less than or equal to 10% are satisfied simultaneously, it is considered that the analysis value is within the preset allowable range, the immersion of the immersion solvent in the ink storage device is ended, and then the ink to be replenished is injected for inkjet printing.

[0169] Please refer to Figure 5 As shown, an embodiment of the present application provides a printing method, including the following steps:

[0170] Step S10, empty the original ink in the print head;

[0171] Step S20, use the print head processing method as described above to determine that the original ink in the print head has been drained;

[0172] Step S30, empty the immersion solvent in the print head;

[0173] Step S40, inject functional layer ink into the print head;

[0174] Step S50, control the print head to inkjet print the functional layer ink onto the substrate to form a functional layer.

[0175] The printing method provided by the embodiment of the present application fully drains the original ink in the print head through the above print head processing method, then injects the functional layer ink, reduces the performance impact of the original ink in the print head on the subsequent preparation of OLED devices, improves the processing efficiency of the print head, and reduces the production cost of functional layer printing.

[0176] In this embodiment, taking the functional layer ink used to prepare the light-emitting layer as an example for further illustration, the printing method specifically includes the following steps:

[0177] Step S10, empty the original ink in the print head;

[0178] Step S20, use the above-mentioned print head treatment method to determine that the original ink in the print head has been drained;

[0179] In this embodiment, the print head treatment method specifically includes the following steps:

[0180] Inject the soaking solvent into the print head until it is full. Here, the original refractive index of the soaking solvent is denoted as n 0 ;

[0181] Let the soaking solvent stand in the inkjet print head for 24 h;

[0182] After 24 h of static soaking, detect the refractive index of the soaking solvent with a refractometer, denoted as n;

[0183] Calculate the change in refractive index Δn of the soaking solvent through the following formula:

[0184] Δn = (n - n 0 ) / n 0

[0185] Judge whether the refractive index change rate Δn of the soaking solvent is less than or equal to 3%; if yes, proceed to the next step; if not, drain the soaking solvent in the print head, add new soaking solvent again, and let the new soaking solvent stand for 24 h for treatment;

[0186] When the refractive index change rate Δn of the soaking solvent ≤ 5%, and the absolute value of the difference between the refractive index of the soaking solvent after soaking and the original refractive index of the soaking solvent |n - n 0 | < 0.00001, stop soaking, and use the soaking solvent obtained when the soaking is stopped to prepare an organic light-emitting device as a test device. Here, the test device is a bottom-emitting OLED device, including an anode, a hole injection layer, a hole transport layer, a buffer layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode stacked from bottom to top;

[0187] Use a current-voltage-luminance (IVL) detection device to detect the optical performance of the test device, and detect the service life of the test device through a lifetime aging device;

[0188] Compare the optical performance and service life of the test device with those of the standard device. If the performance differences of the test device's optical performance and service life compared with those of the standard device are all less than 5%, it is considered that the original ink in the print head has been drained completely, and proceed to the next step;

[0189] Step S30, empty the soaking solvent in the print head;

[0190] In this embodiment, after the step of emptying the soaking solvent in the print head, the following steps are further included:

[0191] Use the functional layer ink as a flushing agent to flush the inkjet print head at least three times to avoid the influence of the residual soaking solvent on the concentration of the ink to be supplemented after the soaking solvent in the inkjet print head is drained completely. In this embodiment, the solvent of the functional layer ink is the same as the material of the soaking solvent.

[0192] Step S40, inject the functional layer ink into the print head;

[0193] Step S50, control the print head to inkjet-print the functional layer ink onto the substrate to form a functional layer.

[0194] In this embodiment, control the print head to inkjet-print the light-emitting layer ink onto the hole functional layer to form a light-emitting layer.

[0195] The printing method provided by the embodiment of the present application reduces the performance impact on the subsequent preparation of OLED devices, improves the processing efficiency of the print head, and reduces the production cost of the print head printing by fully draining the original ink in the print head and then replacing it with the functional layer ink.

[0196] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The accompanying drawings show the preferred embodiments of the present application, but do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structures directly or indirectly using the content of the specification and drawings of the present application in other related technical fields are equally within the scope of the patent protection of the present application.

Claims

1. A method for processing a print head, characterized in that, it includes the following steps: Inject an immersion solvent into the print head; Determine the refractive index of the immersion solvent after soaking for a first preset time; Determine whether to terminate the soaking according to the refractive index of the immersion solvent.

2. The method for processing a print head according to claim 1, characterized in that, the step of determining whether to terminate the soaking according to the refractive index of the immersion solvent specifically includes: Analyze the refractive index of the immersion solvent to obtain an analysis value; When the analysis value is within a preset allowable range, terminate the soaking; Or, when the analysis value exceeds the preset allowable range, perform a treatment for replacing the immersion solvent.

3. The method for processing a print head according to claim 2, characterized in that, the analysis value includes a refractive index difference and a refractive index change value; When the analysis value is the refractive index difference, it refers to the absolute value of the difference between the refractive index of the immersion solvent after soaking for a first preset time and the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than 0.00001; When the analysis value is the refractive index change value, it refers to the ratio of the refractive index difference to the original refractive index of the immersion solvent, and the corresponding preset allowable range is less than or equal to 10%; Preferably, when the detection value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 5%; More preferably, when the detection value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 3%.

4. The method for processing a print head according to claim 1, characterized in that, after the step of determining whether to terminate the soaking according to the refractive index of the immersion solvent, it further includes: Use the immersion solvent obtained when terminating the soaking to prepare an organic light-emitting device, denoted as a test device; Optionally, the test device is prepared by the following operating steps: Provide an anode layer; Set the immersion solvent on the anode layer to form an auxiliary film; Prepare a functional layer on the auxiliary film; Prepare a cathode layer on the functional layer to form a test device; wherein, the functional layer includes at least one of a hole functional layer, a light-emitting layer, and an electron functional layer, the hole functional layer includes a hole injection layer and a hole transport layer, and the electron functional layer includes an electron injection layer and an electron transport layer.

5. The method for processing a print head according to claim 4, characterized in that, When the print head is used to prepare a hole injection layer, the auxiliary film is located between the anode layer and the hole injection layer; Or, when the print head is used to prepare a hole transport layer, the auxiliary film is located between the hole injection layer and the hole transport layer; Or, when the print head is used to prepare a light-emitting layer, the auxiliary film is located between the light-emitting layer and the hole functional layer or between the light-emitting layer and the electron functional layer; Or, when the print head is used to prepare an electron transport layer, the auxiliary film is located between the electron transport layer and the electron injection layer; Or, when the print head is used to prepare an electron injection layer, the auxiliary film is located between the cathode layer and the electron injection layer.

6. The print head processing method according to any one of claims 4 to 5, characterized in that, after the step of using the soaking solvent obtained when terminating soaking to prepare an organic light-emitting device, denoted as a test device, the method further includes: providing a standard device, and detecting the device performance of the test device and / or the device performance of the standard device, including the following steps: detecting the optical performance of the test device and / or the standard device through a current-voltage-luminance (IVL) detection device; and / or detecting the service life of the test device and / or the standard device through a life aging device; Optionally, after the step of detecting the device performance of the test device and / or the device performance of the standard device, the following steps are further included: calculating the difference value between the device performance of the test device and the device performance of the standard device; if the difference between the device performance of the test device and the device performance of the standard device is ≤ 5%, the processing of the print head is completed; or, if the difference between the device performance of the test device and the device performance of the standard device is > 5%, a new soaking solvent is injected into the print head for re-soaking.

7. A printing device, characterized in that, the printing device includes an analysis and processing device and an ink replacement mechanism; wherein, the analysis and processing device includes a detection mechanism and an analysis mechanism, the analysis mechanism is connected to the detection mechanism, and the detection mechanism is used to extract and detect the soaking solvent to obtain the refractive index of the soaking solvent; the analysis mechanism is used to analyze the refractive index of the soaking solvent to obtain an analysis value and determine whether the analysis value is within a preset allowable range; the ink replacement mechanism is used to perform a soaking solvent replacement process when the analysis value exceeds the preset allowable range.

8. The printing device according to claim 7, characterized in that, the detection mechanism includes an ink storage device for storing ink to be printed or the soaking solvent; and / or, the detection mechanism further includes a printing device for performing inkjet printing when the analysis value is within the preset allowable range; and / or, the detection mechanism further includes an ink detection chamber and a refractive index detection component; the ink detection chamber is used to receive the soaking solvent extracted from the ink storage device; the refractive index detection component is used to detect the refractive index of the soaking solvent in the ink detection chamber.

9. The printing device according to claim 7, characterized in that, the analysis value includes a refractive index difference value and a refractive index change value; when the analysis value is the refractive index difference value, it refers to the absolute value of the difference between the refractive index of the soaking solvent after soaking for a first preset time and the original refractive index of the soaking solvent, and the corresponding preset allowable range is less than 0.00001; when the analysis value is the refractive index change value, it refers to the ratio of the refractive index difference value to the original refractive index of the soaking solvent, and the corresponding preset allowable range is less than or equal to 10%; Preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 5%; More preferably, when the detected value is the refractive index change rate, the corresponding preset allowable range is less than or equal to 3%.

10. A printing method characterized in that it includes the following steps: Empty the original ink in the print head; Use the print head processing method according to any one of claims 1 to 6 to determine that the original ink in the print head has been drained; Empty the soaking solvent in the print head; Inject functional layer ink into the print head; Control the print head to inkjet-print the functional layer ink onto the substrate to form a functional layer; Optionally, before the step of injecting the functional layer ink into the print head, it further includes: Use the functional layer ink as a flushing agent to flush the print head at least three times.

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