A printing system and method for preparing a black mask for a direct display module

Abstract

The present invention belongs to the technical field related to the preparation of new display devices, and discloses a printing system for preparing a black mask for a direct display module, which includes a protective cover and a substrate carrier, a motion platform unit, a printing module, a UV curing unit, a first detection unit, and a second detection unit that are placed as a whole inside the protective cover. The present invention also discloses a corresponding printing method, wherein by combining the multiple degrees of freedom of movement and the multifunctional detection characteristics of the above-mentioned printing system, a window printing method can be used to improve the printing film-forming effect of the black mask, and a follow-up curing method can be introduced to obtain different printing effects. Through the present invention, not only can a black mask be prepared on a direct display module in a flexible, controllable, efficient and reliable manner, but the printing quality including indicators such as display brightness and contrast can be further improved, and at the same time, matte and mirror effects can be obtained according to different needs.

Description

Technical Field

[0001] The present invention belongs to the technical field related to the preparation of new display devices, and more specifically, relates to a printing system and method for preparing a black mask for a direct display module. Background Art

[0002] Inkjet printing technology has broad application prospects in manufacturing fields such as information, energy, medical care, and national defense. In recent years, it has been increasingly used in flexible devices such as OLED, RFID, thin-film solar cells, wearable flexible devices, PCBs, smart skins, and LED direct display fields. For example, under the current manufacturing process in the field of direct display modules, different batches of boards will have different colors. This results in different colors in different areas of the backplane after splicing, and the display brightness is also different. In the field of direct display modules, improving display brightness and contrast has always been important, so it is necessary to add a black mask process segment under the current manufacturing process in the field of direct display modules.

[0003] More specifically, black masking refers to the black functional layer applied to the backplane of a direct display module. Currently, the display chip is typically fabricated on the backplane first, followed by a functional film layer applied between the chips. This functional film layer must be precisely controlled to cover the solder pins around the chip and maintain a certain thickness. Furthermore, it must not contaminate the chip surface and must be patterned according to the specific layout of the display chip.

[0004] However, further research revealed that the prior art lacks specific research into the black module manufacturing process, resulting in poor isolation between the processed and non-processed areas. Furthermore, print quality, such as display brightness and contrast, remains to be improved. Consequently, further improvements or refinements are urgently needed to better meet the higher quality requirements of new display device manufacturing. Summary of the Invention

[0005] In response to the above-mentioned defects or needs of the prior art, the purpose of the present invention is to provide a printing system and method for preparing a black mask for a direct display module, wherein research and analysis are carried out by fully combining the molding characteristics and key performance indicators of the black mask, and targeted improvements are made to the structural composition of the entire printing system and the key steps of the overall printing process. Accordingly, not only can a black mask be prepared on the direct display module in a flexible, controllable, efficient and reliable manner, but also the printing quality including indicators such as display brightness and contrast can be further improved by relying on window printing and optimization adjustment of related parameters. At the same time, matte and mirror effects can be obtained according to different needs. Therefore, it is particularly suitable for the preparation and application of new display devices such as LED direct display.

[0006] To achieve the above objectives, according to one aspect of the present invention, a printing system for preparing a black mask for a direct display module is provided, characterized in that the printing system includes a protective cover, and a substrate carrier, a motion platform unit, a printing module, a UV curing unit, a first detection unit, and a second detection unit, which are placed entirely inside the protective cover, wherein:

[0007] The substrate carrier is used to place the direct display module to be printed with a black mask. It is mounted on the X-axis of the motion platform unit and drives the direct display module to move along the X-axis direction.

[0008] The printing module is mounted on the Z-axis of the motion platform unit and can move along the Y-axis of the motion platform unit together with the Z-axis to perform inkjet printing of the black mask;

[0009] The UV curing unit is arranged on one side of the printing module, is mounted on the Z axis of the motion platform unit and moves together with the printing module, and is used to perform UV curing on the direct display module after inkjet printing;

[0010] The first detection unit is mounted on the X1 axis of the motion platform unit and is used to detect the inkjet printing effect of the printing module;

[0011] The second detection unit is arranged on the other side of the printing module, is mounted on the Z-axis of the motion platform unit and can move along the Y-axis with the Z-axis, and is used to perform effect detection on the direct display module after completing inkjet printing and UV curing;

[0012] The motion platform unit has multiple motion axes, including the Y-axis, Z-axis and dual X-axes, i.e., the X-axis and X1-axis parallel to each other, and is used to respectively drive the above-mentioned substrate carrier, printing module, UV curing unit, first detection unit and second detection unit to realize movement in their respective directions.

[0013] As a further preference, the protective cover is in a sealed and light-proof state when in operation and has air purification capability.

[0014] As a further preference, the printing module and the UV curing unit are preferably designed to be integrated and can move synchronously to achieve quantitative control of printing and curing.

[0015] According to another aspect of the present invention, a corresponding printing method is also provided, characterized in that the method comprises the following steps:

[0016] Step 1: placing the direct display module with the black mask to be printed on the substrate carrier;

[0017] Step 2: Using the motion platform unit to drive the second detection unit, scanning and measuring the layout state on the direct display module, and measuring and obtaining the size parameters of the processing area and the non-processing area on its surface;

[0018] Step 3: Setting window printing parameters based on the size parameters of the non-processing area to facilitate subsequent window printing. Window printing involves maintaining a certain distance between the wet film layer formed in the processing area and each adjacent non-processing area. This creates a window-like structure after the entire scanning and printing process and ink droplet flow, thereby reducing the risk of ink droplets contaminating the non-processing area.

[0019] Step 4: Using the motion platform unit, the printing module is moved to the first detection unit; the printing module performs an ink droplet ejection action, and then the first detection unit detects the ejection effect and adjusts the corresponding ink droplet parameters accordingly;

[0020] Step 5: Based on the ink droplet parameters debugged in step 4, generating matching printing pattern data;

[0021] Step 6: Using the motion platform unit to move the printing module to a position above the direct display module, and performing corresponding inkjet printing according to the printing pattern data;

[0022] Step seven: the second detection unit detects the inkjet printing effect of the printing module, and then starts the UV curing unit to perform a curing scan on the printed area, thereby completing the film formation of the black mask on the direct display module.

[0023] As a further preferred embodiment, in step 3, the window printing is preferably set as follows:

[0024] A certain distance is maintained between the wet film layer formed in the processing area and the adjacent non-processing areas. Specifically, the distance parameters between the four edges of each non-processing area and the adjacent ink droplets are set to D1, D2, D3, and D4, respectively, and these distance parameters D1, D2, D3, and D4 are all greater than the average radius R of the ink droplets after the flow and film formation. In this way, the above distance parameter combination forms a window-like structure.

[0025] As a further preferred embodiment, the distance parameters D1, D2, D3, and D4 are preferably optimized and adjusted in the following manner, and then the optimized distance parameters are used to perform the window printing:

[0026] First, N ink droplets are sprayed at intervals in a preset processing area. After the flow of these ink droplets is completed, the second detection unit is used to detect the radius R1, R2, R3, ..., RN of all ink droplets after film formation, and the average radius R= ;

[0027] Next, inkjet printing and curing are performed on the processing area using the initially set distance parameters D1, D2, D3, and D4 to form m window structures;

[0028] Next, the second detection unit is used to detect and measure the actual distance parameters between the film forming edge of the processing area and the four edges of each non-processing area: d11, d12, d13...d1m; d21, d22, d23...d2m; d31, d32, d33...d3m; d41, d42, d43...d4m;

[0029] Next, the average values ​​of the above actual distance parameters d1, d2, d3, and d4 are calculated:

[0030] d1= ;

[0031] d2= ;

[0032] d3= ;

[0033] d4= ;

[0034] Next, the optimized distance parameters D1~, D2~, D3~, and D4~ are calculated based on the above average values:

[0035] D1~=d1+R; D2~=d2+R; D3~=d3+R; D4~=d3+R.

[0036] As a further preferred embodiment, in step 6, the printing module is first moved and positioned above the direct display module using the motion platform unit, and then the direct display module moves along the X-axis of the motion platform, and inkjet printing is preferably performed in the following manner:

[0037] The printing module scans and prints along the Y-axis and completes one pass of printing. After the first pass is completed, the direct display module advances a certain distance along the X-axis, and the printing module moves accordingly along the Y-axis to complete the second pass of printing. This cycle is repeated until the scanning and printing of the entire processing area is completed. When ink droplets fall on the processing area, each ink droplet flows around the processing area and overlaps and leveled in turn, thereby forming a wet film layer together.

[0038] As a further preferred embodiment, in step seven, the entire curing scanning process is preferably completed in a follow-up curing manner, thereby further reducing the phenomenon of ink droplets contaminating non-processing areas.

[0039] As a further preferred embodiment, the follow-up curing is preferably designed in the following manner, thereby presenting both matte and mirror effects on the direct display module:

[0040] In matte finish mode, each time the print module scans and prints along the Y-axis and completes a printing pass, the UV curing unit performs a backscan to cure the area printed in the previous pass. The substrate stage then advances to perform the next pass. In this way, inkjet printing is completed sequentially across the entire processing area. In this process, a matte finish is achieved by printing the next pass after curing a single pass.

[0041] Under the mirror effect working condition, after the entire processing area is completed by inkjet printing in sequence, the UV curing unit is turned on to perform curing; in the above process, since the film layers formed before curing are all wet films, a mirror surface effect can be formed after the curing is completed.

[0042] As a further preference, the substrate is preferably used for new display devices such as LED direct display.

[0043] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0044] (1) The present invention improves the structure of the entire printing system and several key components such as the motion platform unit, the printing module, the UV curing unit, the first detection unit and the second detection unit, thereby being able to prepare various required black masks on the direct display module in a flexible, controllable, efficient and reliable manner. Therefore, the present invention is particularly suitable for the preparation and application of new display devices such as LED direct display.

[0045] (2) The present invention further introduces a window printing method into the inkjet printing process. Many actual tests have shown that it can well achieve the isolation of the processing area and the non-processing area, effectively reducing or preventing ink droplets from contaminating the non-processing area; at the same time, by providing an algorithm for optimizing the window printing parameters, it can better ensure the final printing effect of the entire window printing;

[0046] (3) The present invention further introduces a follow-up curing method to improve the printing effect, and accordingly can obtain matte and mirror effects according to different occasions to meet different needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the overall structure of a printing system for preparing a black mask for a direct display module according to the present invention;

[0048] Figure 2This is a process flow chart of a printing method for preparing a black mask for a direct display module according to the present invention;

[0049] Figure 3a and 3b are schematic diagrams for explaining in more detail the process of performing inkjet printing on a black mask;

[0050] Figure 4 It is a schematic diagram of a window printing method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] It should also be noted that, in the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two elements, or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] It should also be noted that, in the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] Figure 1 The figure is a schematic diagram of the overall structure of a printing system for preparing a black mask for a direct display module according to the present invention. The system primarily comprises a protective cover 8, a substrate carrier 2 housed within the protective cover 8, a motion platform unit 4, a printing module 7, a UV curing unit 5, a first detection unit 6, and a second detection unit 3. Each component is described in detail below.

[0057] like Figure 1 As shown, the protective cover 8 is sealed and opaque in the working state, preventing the influence of light on the outside world under UV curing conditions, and has air purification capability.

[0058] As for the substrate carrier 2, it is used to place the direct display module 1 to be printed with a black mask. It is loaded on the X-axis of the motion platform unit 4 and drives the direct display module 1 to move along the X-axis direction.

[0059] Printing module 7 is mounted on the Z-axis of motion platform unit 4 and can move along the Y-axis of motion platform unit 4 with the Z-axis to perform inkjet printing of the black mask. Accordingly, UV curing unit 5 is provided on one side of printing module 7. It is mounted on the Z-axis of motion platform unit 4 and moves along with the printing module 7 to perform UV curing on direct display module 1 after inkjet printing. According to a preferred embodiment of the present invention, printing module 7 and UV curing unit 5 are integrated and can move synchronously to achieve quantitative control of printing and curing.

[0060] The first detection unit 6 is mounted on the X1 axis of the motion platform unit 4 and is used to detect the inkjet printing effect of the printing module 7. The second detection unit 3 is set on the other side of the printing module 8. It is mounted on the Z axis of the motion platform unit 4 and can move along the Y axis with the Z axis. It is used to perform effect detection on the direct display module 1 after completing inkjet printing and UV curing.

[0061] The motion platform unit 4 has multiple motion axes, specifically the Y-axis, Z-axis, and dual X-axes, namely the parallel X-axis and X1-axis, and is used to respectively drive the substrate stage 2, printing module 7, UV curing unit 5, first detection unit 6, and second detection unit 3 to achieve movement in their respective directions. As is well known in the art, the above functions can be achieved through conventional mechanical structures to achieve multi-axis motion freedom, so they will not be described in detail here.

[0062] Figure 2 This is a process flow chart of the printing method for preparing a black mask for a direct display module according to the present invention. Figure 2 To explain the printing process of the present invention in more detail.

[0063] like Figure 2 As shown, the printing method of the black mask of the entire direct display module mainly includes the following steps:

[0064] Step 1: Place the direct display module with the black mask to be printed on the substrate carrier 2;

[0065] Step 2: Use the motion platform unit 4 to drive the second detection unit 3 to scan and measure the layout state on the direct display module 1, and measure and obtain the size parameters of the processing area 1-01 and the non-processing area 1-02 on its surface;

[0066] Step 3: Setting window printing parameters based on the size parameters of the non-processing area to facilitate subsequent window printing. Window printing involves maintaining a certain distance between the wet film layer formed in the processing area 1-01 and each adjacent non-processing area 1-02. This creates a window-like structure after the entire scanning and printing process and ink droplet flow, thereby reducing the risk of ink droplets contaminating the non-processing area 1-02.

[0067] More specifically, according to a preferred embodiment of the present invention, the window printing is preferably set as follows:

[0068] Please see Figure 3a 、 3b and Figure 4 , a certain distance is maintained between the wet film layer formed in the processing area 1-01 and the adjacent non-processing areas 1-02. Specifically, the distance parameters between the four edges of each non-processing area 1-02 and the adjacent ink droplets are set to D1, D2, D3, and D4, respectively, and these distance parameters D1, D2, D3, and D4 are all greater than the average radius R of the ink droplets after the flow and film formation. In this way, the above distance parameter combination forms a window-like structure. Figure 3a and 3b In the figure, 1-03 and 1-04 respectively represent schematic diagrams of dotting and leveling film formation in the processing area before and after. Through the above method, after executing all the dotting and flow, a window-like structure will eventually be formed on the surface of the direct display module, and the phenomenon of contamination of the non-processing area 1-02 is significantly reduced.

[0069] In addition, according to another preferred embodiment of the present invention, the distance parameters D1, D2, D3, and D4 may be optimized and adjusted in the following manner, and then the optimized distance parameters are used to perform the window printing:

[0070] First, N ink droplets are sprayed at intervals in a preset processing area. After the flow of these ink droplets is completed, the second detection unit 3 is used to detect the radius R1, R2, R3, ..., RN of all ink droplets after film formation, and the average radius R= ;

[0071] Next, inkjet printing and curing are performed on the processing area using the initially set distance parameters D1, D2, D3, and D4 to form m window structures;

[0072] Next, the second detection unit 3 is used to detect and measure the actual distance parameters between the film forming edge of the processing area and the four edges of each non-processing area: d11, d12, d13...d1m; d21, d22, d23...d2m; d31, d32, d33...d3m; d41, d42, d43...d4m;

[0073] Next, the average values ​​of the above actual distance parameters d1, d2, d3, and d4 are calculated:

[0074] d1= ;

[0075] d2= ;

[0076] d3= ;

[0077] d4= ;

[0078] Next, the optimized distance parameters D1~, D2~, D3~, and D4~ are calculated based on the above average values:

[0079] D1~=d1+R; D2~=d2+R; D3~=d3+R; D4~=d3+R.

[0080] Step 4: Use the motion platform unit 4 to move the printing module 7 to the first detection unit 6; the printing module 7 performs an ink droplet ejection action, and then the first detection unit 6 detects the ejection effect and adjusts the corresponding ink droplet parameters accordingly;

[0081] Step 5: Based on the ink droplet parameters debugged in step 4, generating matching printing pattern data;

[0082] Step 6: Use the motion platform unit 4 to move the printing module 7 to a position above the direct display module 1, and perform corresponding inkjet printing according to the printing pattern data;

[0083] More specifically, according to another preferred embodiment of the present invention, in step six, the motion platform unit 4 is first used to move the printing module 7 to be positioned above the direct display module 1, and then the direct display module 1 moves along the X-axis of the motion platform 4, and preferably performs inkjet printing in the following manner: the printing module 7 scans and prints along the Y-axis and completes the printing of one pass; when the first pass is completed, the direct display module 1 feeds a certain distance along the X-axis, and the printing module 7 moves accordingly along the Y-axis and completes the printing of the second pass; this cycle is repeated until the scanning and printing of the entire processing area is completed; wherein, after the ink droplets fall on the processing area 1-01, the ink droplets flow to the surrounding areas in the processing area 1-01 and overlap and level in sequence, thereby forming a wet film layer together.

[0084] Step seven: the second detection unit 3 detects the inkjet printing effect of the printing module 7, and then starts the UV curing unit 5 to perform a curing scan on the printed area, thereby completing the film formation of the black mask on the direct display module 1.

[0085] During the aforementioned printing process, from printing to flow to film formation, as ink flow increases over time, the area covered by the flow increases. Before solidification, the film layer may flow beyond the window printing area and enter the non-processing area 1-02, thereby contaminating the non-processing area 1-02. To address the above technical issues, the present invention further adopts a follow-up curing method to solve this problem.

[0086] More specifically, the follow-up curing is preferably designed in the following manner, thereby presenting both matte and mirror effects on the direct display module 1: under the matte effect condition, each time the printing module 7 scans and prints along the Y axis and completes one pass of printing, the UV curing unit 5 performs a curing backscan on the area printed by this pass; then, the substrate carrier 2 feeds to perform the next pass process; in this way, the inkjet printing of the entire processing area is completed in sequence; in the above process, since a single pass is cured and the next pass is printed again, a matte surface effect can be formed accordingly; under the mirror effect condition, after the entire processing area is completed by inkjet printing in sequence, the UV curing unit 5 is turned on to perform curing; in the above process, since the film layers formed before curing are all wet films, a mirror surface effect can be formed accordingly after the curing is completed.

[0087] To sum up, through the present invention, not only can a black mask be prepared on the direct display module in a flexible, controllable, efficient and reliable manner, but also the printing quality including indicators such as display brightness and contrast can be further improved by relying on window printing and optimization adjustment of related parameters. At the same time, matte and mirror effects can be obtained according to different needs. Therefore, it is particularly suitable for the preparation and application of new display devices such as LED direct display.

[0088] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A printing system for preparing a black mask for a direct display module, characterized in that: The printing system includes a protective cover, and a substrate carrier, a motion platform unit, a printing module, a UV curing unit, a first detection unit and a second detection unit which are placed in the protective cover as a whole, wherein: The substrate carrier is used to place the direct display module to be printed with a black mask. It is mounted on the X-axis of the motion platform unit and drives the direct display module to move along the X-axis direction. The printing module is mounted on the Z-axis of the motion platform unit and can move along the Y-axis of the motion platform unit with the Z-axis to perform inkjet printing of the black mask; the printing module is designed to set window printing parameters according to the size parameters of the non-processing area in order to perform subsequent window printing, wherein the window printing refers to maintaining a certain distance between the wet film layer formed in the processing area and each adjacent non-processing area, that is, the distance parameters between the four edges of each non-processing area and the adjacent ink droplets are set to D1, D2, D3, and D4 respectively, and these distance parameters D1, D2, D3, and D4 are all greater than the average radius R of the ink droplets after film formation. Accordingly, after the entire scanning and printing and ink droplet flow are completed, a window-like structure is formed, thereby reducing the phenomenon of ink droplets contaminating the non-processing area; The UV curing unit is arranged on one side of the printing module, is mounted on the Z axis of the motion platform unit and moves together with the printing module, and is used to perform UV curing on the direct display module after inkjet printing; The first detection unit is mounted on the X1 axis of the motion platform unit and is used to detect the inkjet printing effect of the printing module; The second detection unit is arranged on the other side of the printing module, is mounted on the Z-axis of the motion platform unit and can move along the Y-axis with the Z-axis, and is used to scan and measure the layout status on the direct display module before the window printing, and measure and obtain the respective size parameters of the processing area and the non-processing area on its surface, and is used to detect the actual distance parameters between the wet film layer formed in the processing area and the four edges of each adjacent non-processing area after the window printing; The motion platform unit has multiple motion axes, including the Y-axis, Z-axis, and dual X-axes, i.e., the X-axis and X1-axis, which are parallel to each other, and is used to respectively drive the substrate carrier, printing module, UV curing unit, first detection unit, and second detection unit to achieve movement in their respective directions; in addition, the distance parameters D1, D2, D3, and D4 are optimized and adjusted in the following manner, and then the optimized and adjusted distance parameters are used to perform the window printing: First, N ink droplets are sprayed at intervals in a preset processing area. After the flow of these ink droplets is completed, the second detection unit is used to detect the radius R1, R2, R3, ..., R of all ink droplets after film formation. N , and get the average radius R= ; Next, inkjet printing and curing are performed on the processing area using the initially set distance parameters D1, D2, D3, and D4 to form m window structures; Next, the second detection unit is used to detect and measure the actual distance parameter between the film forming edge of the processing area and the four edges of each non-processing area: d 11 d 12 d 13 ...d 1m ;d 21 d 22 d 23 ...d 2m ;d 31 d 32 d 33 ...d 3m ;d 41 d 42 d 43 ...d 4m ; Next, the average values ​​of the above actual distance parameters d1, d2, d3, and d4 are calculated: d1= ； d2= ； d3= ； d4= ； Next, the optimized distance parameters D1~, D2~, D3~, and D4~ are calculated based on the above average values: D1~=d1+R; D2~=d2+R; D3~=d3+R; D4~=d3+R.

2. The printing system according to claim 1, wherein: The protective cover is in a sealed and lightproof state when in operation and has air purification capability.

3. The printing system according to claim 1 or 2, characterized in that: The printing module and the UV curing unit are integrated and can move synchronously to achieve quantitative control of printing and curing.

4. A printing method for preparing a black mask for a direct display module based on the printing system according to any one of claims 1 to 3, characterized in that: The printing method comprises the following steps: Step 1: placing the direct display module with the black mask to be printed on the substrate carrier; Step 2: Using the motion platform unit to drive the second detection unit, scanning and measuring the layout state on the direct display module, and measuring and obtaining the size parameters of the processing area and the non-processing area on its surface; Step 3: Setting window printing parameters according to the size parameters of the non-processing area in order to perform subsequent window printing, wherein the window printing refers to maintaining a certain distance between the wet film layer formed in the processing area and each adjacent non-processing area, that is, setting the distance parameters between the four edges of each non-processing area and the adjacent ink droplets to D1, D2, D3, and D4, respectively, and these distance parameters D1, D2, D3, and D4 are all greater than the average radius R after the ink droplets flow and form a film. Accordingly, after the entire scanning and printing and ink droplet flow are completed, a window-like structure will be formed, thereby reducing the phenomenon of ink droplets contaminating the non-processing area; in addition, the distance parameters D1, D2, D3, and D4 are optimized and adjusted in the following manner, and then the optimized and adjusted distance parameters are used to perform the window printing: First, N ink droplets are sprayed at intervals in a preset processing area. After the flow of these ink droplets is completed, the second detection unit is used to detect the radius R1, R2, R3, ..., R of all ink droplets after film formation. N , and get the average radius R= ; Next, inkjet printing and curing are performed on the processing area using the initially set distance parameters D1, D2, D3, and D4 to form m window structures; Next, the second detection unit is used to detect and measure the actual distance parameter between the film forming edge of the processing area and the four edges of each non-processing area: d 11 d 12 d 13 ...d 1m ;d 21 d 22 d 23 ...d 2m ;d 31 d 32 d 33 ...d 3m ;d 41 d 42 d 43 ...d 4m ; Next, the average values ​​of the above actual distance parameters d1, d2, d3, and d4 are calculated: d1= ； d2= ； d3= ； d4= ； Next, the optimized distance parameters D1~, D2~, D3~, and D4~ are calculated based on the above average values: D1~=d1+R; D2~=d2+R; D3~=d3+R; D4~=d3+R; Step 4: Using the motion platform unit, the printing module is moved to the first detection unit; the printing module performs an ink droplet ejection action, and then the first detection unit detects the ejection effect and adjusts the corresponding ink droplet parameters accordingly; Step 5: Based on the ink droplet parameters debugged in step 4, generating matching printing pattern data; Step 6: Using the motion platform unit to move the printing module to a position above the direct display module, and performing corresponding inkjet printing according to the printing pattern data; Step seven: the second detection unit detects the inkjet printing effect of the printing module, and then starts the UV curing unit to perform a curing scan on the printed area, thereby completing the film formation of the black mask on the direct display module.

5. The printing method according to claim 4, wherein: In step 6, the motion platform unit is first used to move the printing module to a position above the direct display module. The direct display module then moves along the X-axis of the motion platform and performs inkjet printing in the following manner: The printing module scans and prints along the Y-axis and completes one pass of printing. After the first pass is completed, the direct display module advances a certain distance along the X-axis, and the printing module moves accordingly along the Y-axis to complete the second pass of printing. This cycle is repeated until the scanning and printing of the entire processing area is completed. When ink droplets fall on the processing area, each ink droplet flows around the processing area and overlaps and leveled in turn, thereby forming a wet film layer together.

6. The printing method according to claim 5, wherein: In step seven, the entire curing scanning process is completed in a follow-up curing manner, thereby further reducing the phenomenon of ink droplets contaminating non-processing areas.

7. The printing method according to claim 6, wherein: The follow-up curing is designed in the following way, thereby presenting both matte and mirror effects on the direct display module: In matte finish mode, each time the print module scans and prints along the Y-axis and completes a printing pass, the UV curing unit performs a backscan to cure the area printed in the previous pass. The substrate stage then advances to perform the next pass. In this way, inkjet printing is completed sequentially across the entire processing area. In this process, a matte finish is achieved by printing the next pass after curing a single pass. Under the mirror effect working condition, after the entire processing area is completed by inkjet printing in sequence, the UV curing unit is turned on to perform curing; in the above process, since the film layers formed before curing are all wet films, a mirror surface effect can be formed after the curing is completed.

Images