Double-needle printing device and protective layer printing device for display equipment

Abstract

The embodiments of this specification relate to the field of printing technology, specifically to a dual-needle printing device and a protective layer printing device for a display device. The dual-needle printing device includes two separate needle height compensation modules for each of the two printing needles, thereby improving line printing efficiency while maintaining line printing parameters. Furthermore, two separate height adjustment lower limit modules are provided for each of the first and second printing needles, minimizing the risk of needle collision with the printing surface.

Description

Technical Field

[0001] Multiple embodiments of this specification relate to the field of printing technology, and more particularly to a dual-needle printing device and a protective layer printing device for a display device. Background Art

[0002] Currently, in the process of circuit printing, a single needle printing method is usually adopted, that is, it is necessary to complete the printing of one circuit before the complete printing of the second circuit, thereby reducing the circuit printing efficiency.

[0003] If dual-needle printing is used, i.e., two lines are printed simultaneously, there is a problem in which the height data of the printing surface on different printing paths are different. Therefore, how to simultaneously ensure the printing parameters of the two printing lines becomes an urgent problem to be solved.

[0004] Furthermore, high-precision printing requires the print head to be positioned very close to the printing surface. Therefore, lowering the print head can cause collisions with the printing surface, severely impacting printed circuits. Furthermore, when dual-head printing is used, the increased number of needles makes it particularly important to address this collision issue. Summary of the Invention

[0005] The embodiments of this specification provide a dual-needle printing device and a protective layer printing device for a display device, which can improve the printing efficiency of the circuit while ensuring the circuit printing parameters, and can avoid the problem of needle collision with the printing surface to the greatest extent during the printing process.

[0006] The technical solution is as follows:

[0007] In a first aspect, an embodiment of the present specification provides a dual-needle printing device, comprising:

[0008] A main body bracket, a double-needle printing mechanism mounted on the main body bracket for synchronously printing a first line and a second line at intervals on a substrate surface, and a data acquisition module for respectively acquiring first height data of the substrate surface at a location where the first line is printed and second height data at a location where the second line is printed;

[0009] The double-needle printing mechanism includes a first printing needle module mounted on the main body bracket for printing the first circuit and a second printing needle module for printing the second circuit;

[0010] The first printing needle module includes a first printing needle and a first adjusting unit mounted on the main body bracket for adjusting the printing height of the first printing needle in real time during printing of the first line based on the first height data;

[0011] The second printing needle module includes a second printing needle and a second adjustment unit mounted on the main support for adjusting the printing height of the second printing needle in real time during printing of the second line based on the second height data;

[0012] The dual-needle printing device further includes a first limiting module for adjustably limiting the lower limit of the printing height adjustment of the first printing needle and a second limiting module for adjustably limiting the lower limit of the printing height adjustment of the second printing needle.

[0013] As a preferred solution, the first adjustment unit includes a first electric vertical lifting subunit installed on the main body bracket, and the first printing needle is installed on the first electric vertical lifting subunit and performs lifting movement synchronously with the first electric vertical lifting subunit.

[0014] As a preferred solution, the first limiting module includes a first blocking block installed on the first electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the first electric vertical lifting sub-unit. The first limiting module also includes a first limiting member installed on the main body bracket in a height-adjustable manner to block and limit the first blocking block when the first electric vertical lifting sub-unit performs a descending movement.

[0015] As a preferred solution, the main frame is provided with a plurality of first mounting positions at different heights, each of which can be equipped with the first limiting member, and the main frame is engraved with first mounting position height data corresponding to each first mounting position at a position corresponding to each first mounting position;

[0016] The first limiting member includes a first mounting block, which can be installed in any one of a plurality of first mounting positions. The first limiting member also includes a first limiting rod that is exposed and height-adjustably installed on the first mounting block to block and limit the first blocking block when the first electric vertical lifting sub-unit performs a descending movement. The first limiting rod is engraved with first fine-tuning scale data.

[0017] As a preferred solution, the double-needle printing device further includes a second electric vertical lifting subunit mounted on the main body bracket, and the first limiter is mounted on the second electric vertical lifting subunit and performs synchronous lifting movement with the second electric vertical lifting subunit.

[0018] As a preferred solution, the second electric vertical lifting sub-unit adjusts the height of the first limiter in real time based on the first height data during the process of the first printing needle printing the first line.

[0019] As a preferred solution, the second adjustment unit includes a third electric vertical lifting sub-unit installed on the main body bracket and a horizontal slide sub-unit installed on the third electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit. The second printing needle is installed on the horizontal slide sub-unit and performs synchronous horizontal movements with the horizontal slide sub-unit.

[0020] As a preferred solution, the second limiting module includes a second blocking block installed on the third electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit. The second limiting module also includes a second limiting member installed on the main body bracket in a height-adjustable manner to block and limit the second blocking block when the third electric vertical lifting sub-unit performs a descending movement.

[0021] As a preferred solution, the main frame is provided with a plurality of second mounting positions at different heights, each of which can be equipped with the second limiting member, and the main frame is engraved with the second mounting position height data corresponding to each second mounting position at a position corresponding to each second mounting position;

[0022] The second limiting member includes a second mounting block, which can be installed in any one of a plurality of second mounting positions. The second limiting member also includes a second limiting rod installed on the second mounting block in an adjustable manner so as to block and limit the second blocking block when the third electric vertical lifting sub-unit moves downward. The second limiting rod is engraved with second fine-tuning scale data.

[0023] As a preferred solution, the double-needle printing device further includes a fourth electric vertical lifting subunit mounted on the main support, and the second limiter is mounted on the fourth electric vertical lifting subunit and performs synchronous lifting movement with the fourth electric vertical lifting subunit.

[0024] As a preferred solution, the fourth electric vertical lifting sub-unit adjusts the height of the second limiter in real time based on the second height data during the process of the second printing needle printing the second line.

[0025] In a second aspect, an embodiment of this specification further provides a protective layer printing device for a display device, the display device comprising a display panel and a flexible circuit board on a side of the display panel, the printing device comprising a filler printing module and the dual-needle printing device described in the first aspect of the above embodiment;

[0026] The dual-needle printing device is used to use a flexible circuit board as a substrate to simultaneously print the first and second circuits spaced apart on the flexible circuit board, thereby forming two retaining wall structures spaced apart on the flexible circuit board on the side of the display panel; the filling glue printing module is used to print filling glue between the two retaining wall structures to form a protective layer on the side of the display panel.

[0027] The beneficial effects of the technical solutions provided by some embodiments of this specification include at least:

[0028] A dual-needle printing device is provided. Two separate needle height compensation modules are provided for each of the two printing needles, thereby improving line printing efficiency while maintaining line printing parameters. Furthermore, two separate lower limit height adjustment modules are provided for the first and second printing needles, minimizing the risk of needle collision with the printing surface.

[0029] A protective layer printing device for a display device is provided, which is provided with at least two retaining wall printing modules, namely the first printing needle module and the second printing needle module. The two retaining walls can be printed in one step, forming a second retaining wall structure close to the display panel and a first retaining wall structure away from the display panel on the flexible circuit board. The position between the first retaining wall structure and the second retaining wall structure is used as the position covered by the circuit protection layer, and the filling glue is printed by the filling glue printing module to form the circuit protection layer. The circuit protection layer formed in this way can control the parameters so that the dimensional data of the two retaining walls are equivalent, so that the filling glue will naturally level between the two retaining walls without causing a sharp climbing phenomenon and no depression. Therefore, the thickness of the formed circuit protection layer film is highly uniform. In addition, due to the existence of the retaining wall close to the display panel, it will not climb to the surface of the display panel, and will not affect the subsequent packaging or even the display effect. In addition, the two printing needle modules can print two retaining walls at once in one step, without the need for sequential printing as in single needle printing, which can effectively improve work efficiency. The two separate height compensation modules can be used to adjust the printing parameters of the first and second print head modules, respectively, to ensure that the dimensions of the resulting retaining wall remain consistent to the greatest extent possible, further facilitating uniform thickness of the circuit protection layer. Furthermore, two separate height adjustment lower limit modules, each for the first and second print head modules, minimize collisions between the print head and the flexible circuit board, thereby protecting the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of a double-needle printing device provided in an embodiment of this specification.

[0032] Figure 2 This is a partial enlarged view of the position of the restriction module in a double-needle printing device provided in an embodiment of this specification.

[0033] Figure 3 It is a schematic diagram of the structure of forming a single retaining wall protective layer on a flexible circuit board.

[0034] Figure 4 It is a schematic diagram of the structure of forming a double retaining wall protection layer on a flexible circuit board.

[0035] Figure 5 This is a schematic diagram of printing a double retaining wall structure on a flexible circuit board.

[0036] Figure 6 This is a schematic diagram of printing filler glue on a flexible circuit board.

[0037] In the figure: 1. Main bracket; 2. First electric vertical lifting subunit; 3. Third electric vertical lifting subunit; 4. Horizontal slide subunit; 5. Second printing needle head; 6. First printing needle head; 7. First blocking block; 8. First limiting member; 81. First mounting block; 82. First limiting rod; 83. First mounting position; 91. Display panel; 92. Flexible circuit board; 93. Protective layer; 94. First retaining wall structure; 95. Second retaining wall structure; 10. Filling glue printing module. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of this specification will be described clearly and completely below in conjunction with the drawings in the embodiments of this specification.

[0039] Throughout this specification, the claims, and the accompanying drawings, the terms "first," "second," "third," and the like are used to distinguish between different items, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may include other steps or elements inherent to the process, method, product, or apparatus.

[0040] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of this specification. Various examples may appropriately omit, replace, or add various processes or components. For example, the described methods may be performed in an order different from the order described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined in other examples.

[0041] Reference Figure 1 The figure is a schematic diagram of the overall structure of a double-needle printing device provided in one or more embodiments of this specification. The double-needle printing device may include at least:

[0042] A main body support 1, a double-needle printing mechanism mounted on the main body support 1 for synchronously printing a first line and a second line at intervals on a substrate surface, and a data acquisition module for respectively acquiring first height data of the substrate surface at a location along the first line printing path and a second height data at a location along the second line printing path;

[0043] The double-needle printing mechanism includes a first printing needle module mounted on the main frame 1 for printing the first circuit and a second printing needle module for printing the second circuit;

[0044] The first printing needle module includes a first printing needle 6 and a first adjustment unit installed on the main support 1 for adjusting the printing height of the first printing needle 6 in real time during the printing of the first line based on the first height data;

[0045] The second printing needle module includes a second printing needle 5 and a second adjustment unit installed on the main support 1 for adjusting the printing height of the second printing needle in real time during the printing of the second line based on the second height data;

[0046] The dual-needle printing device further includes a first limiting module for adjustably limiting the lower limit of the printing height adjustment of the first printing needle 6 and a second limiting module for adjustably limiting the lower limit of the printing height adjustment of the second printing needle.

[0047] It should be noted that the first height data and the second height data can be obtained by an image acquisition module independently set up from the double-needle printing mechanism, or can be respectively identified by an image recognition module respectively set at the bottom of the first printing needle 6 and the bottom of the second printing needle 5.

[0048] This embodiment provides a dual-needle printing device that includes two separate needle height compensation modules for each of the two printing needles. This improves line printing efficiency while maintaining line printing parameters. Furthermore, two separate height adjustment lower limit modules are provided for the first and second printing needles (note: these limit the lowering height limits of the first and second printing needles, respectively), minimizing the risk of the printing needles colliding with the printing surface.

[0049] In one embodiment of the present specification, the first adjustment unit includes a first electric vertical lifting subunit 2 installed on the main body bracket 1, and the first printing needle head 6 is installed on the first electric vertical lifting subunit 2 and performs synchronous lifting movement with the first electric vertical lifting subunit 2.

[0050] It can be understood that the lifting movement of the first electric vertical lifting subunit 2 drives the lifting of the first printing needle head 6, thereby achieving the purpose of adjusting the height of the first printing needle head 6.

[0051] Reference Figure 2 The figure shown is a partial enlarged view of the position of the limiting module in a double-needle printing device provided in one or more embodiments of this specification.

[0052] The first limiting module includes a first blocking block 7 installed on the first electric vertical lifting sub-unit 2 and performing synchronous lifting and lowering movements with the first electric vertical lifting sub-unit 2. The first limiting module also includes a first limiting member 8 installed on the main body bracket 1 in a height-adjustable manner to block and limit the first blocking block 7 when the first electric vertical lifting sub-unit 2 performs a descending movement.

[0053] It can be understood that in this embodiment, by adjusting the height of the first limit member 8 on the main bracket 1, the blocking height of the first blocking block 7 is adjusted, thereby achieving an adjustable limit on the lower limit of the printing height adjustment of the first printing needle head 6.

[0054] In one embodiment of this specification, a method for adjusting the height of the first limiter 8 is provided:

[0055] The main frame 1 is provided with a plurality of first mounting positions 83 at different heights, each of which can be equipped with the first limiting member 8. The main frame 1 is provided with first mounting position height data corresponding to each first mounting position 83 engraved at a position corresponding to each first mounting position 83.

[0056] The first limiting member 8 includes a first mounting block 81, which can be installed in any one of a plurality of first mounting positions 83. The first limiting member 8 also includes a first limiting rod 82 that is exposed and height-adjustably installed on the first mounting block 81 to block and limit the first blocking block 7 when the first electric vertical lifting sub-unit 2 moves downward. The first limiting rod 82 is engraved with first fine-tuning scale data.

[0057] It is understood that since the height adjustment of the printing stylus is generally quite precise, in this embodiment, the corresponding first mounting position 83 can be selected based on the height adjustment requirements and the first mounting position height data of each first mounting position 83 to install the first mounting block 81, thereby achieving coarse adjustment of the height of the first stopper 8. Furthermore, the height of the first stopper rod 82 exposed on the first mounting block 81 can be adjusted based on the height adjustment requirements and the first fine adjustment scale data engraved on the first stopper rod 82, thereby achieving fine adjustment of the height of the first stopper 8.

[0058] It should be noted that the first installation position 83 can be but is not limited to Figure 2 The exposed height of the first limiting rod 82 on the first mounting block 81 is adjustable, which can be achieved by, but not limited to, threading the first limiting rod 82 into the first mounting block 81.

[0059] In one embodiment of the present specification, the first limiting rod 82 may be made of a flexible material to avoid the impact on the device caused by the collision between the first mounting block 81 and the first blocking block 7 during the downward adjustment process.

[0060] In one embodiment of the present specification, another method for adjusting the height of the first limiting member 8 is provided:

[0061] The double-needle printing device also includes a second electric vertical lifting subunit installed on the main bracket 1 (Note: the second electric vertical lifting subunit is not shown in the accompanying drawings), and the first limit member 8 is installed on the second electric vertical lifting subunit and performs synchronous lifting and lowering movements with the second electric vertical lifting subunit.

[0062] It should be noted that in this embodiment, the first limit member 8 is electrically lifted and lowered by the second electric vertical lifting subunit, so it is more convenient than the manual installation and adjustment method in the aforementioned embodiment. Moreover, since it is changed to an electrically lifted and lowered method, real-time adjustment can be achieved during the printing process.

[0063] Therefore, in this embodiment, the second electric vertical lifting sub-unit can adjust the height of the first limiter 8 in real time based on the first height data when the first printing needle 6 prints the first line.

[0064] In this method, the first limiting member 8 can be understood as an integral part. Since the adjustment accuracy of the electronic control method is usually higher, there is no need to use a combination of coarse adjustment and fine adjustment.

[0065] Reference Figure 1As shown, in one embodiment of the present specification, the second adjustment unit includes a third electric vertical lifting sub-unit 3 installed on the main body bracket 1 and a horizontal slide sub-unit 4 installed on the third electric vertical lifting sub-unit 3 and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit 3, and the second printing needle head 5 is installed on the horizontal slide sub-unit 4 and performs synchronous horizontal movements with the horizontal slide sub-unit 4.

[0066] It can be understood that compared with the first adjustment unit, the second adjustment unit adds a lateral adjustment function for the second printing needle 5, thereby realizing the adjustment of the distance between the first printing needle 6 and the second printing needle 5 to meet more printing demand scenarios.

[0067] It should be noted that Figure 2 The sliding direction of the transverse slide subunit 4 is perpendicular to the main support 1 , that is, it can slide toward the direction close to the main support 1 or slide away from the main support 1 .

[0068] In one embodiment of the present specification, the second limiting module includes a second blocking block installed on the third electric vertical lifting sub-unit 3 and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit 3. The second limiting module also includes a second limiting member installed on the main body bracket 1 in a height-adjustable manner to block and limit the second blocking block when the third electric vertical lifting sub-unit 3 performs a descending movement.

[0069] It can be understood that in this embodiment, by adjusting the height of the second limiter on the main support 1, the blocking height of the second blocking block is adjusted, thereby achieving an adjustable limit on the lower limit of the printing height adjustment of the second printing needle head 5.

[0070] In one embodiment of this specification, a method for adjusting the height of the second limiter is provided:

[0071] The main frame 1 is provided with a plurality of second mounting positions at different heights, each of which can be equipped with the second limiting member, and the main frame is provided with second mounting position height data corresponding to each second mounting position engraved at a position corresponding to each second mounting position;

[0072] The second limiting member includes a second mounting block, which can be installed in any one of a plurality of second mounting positions. The second limiting member also includes a second limiting rod which is installed on the second mounting block in an adjustable manner and blocks and limits the two blocking blocks when the third electric vertical lifting sub-unit 3 moves downward. The second limiting rod is engraved with second fine-tuning scale data.

[0073] It is understood that since the height adjustment of the printing stylus is generally quite fine, in this embodiment, the second mounting block can be installed in the corresponding second mounting position based on the height adjustment requirements and the second mounting position height data of each second mounting position to achieve coarse adjustment of the height of the second stopper. Furthermore, the height of the second stopper rod exposed on the second mounting block can be adjusted based on the height adjustment requirements and the second fine adjustment scale data engraved on the second stopper rod to achieve fine adjustment of the height of the second stopper.

[0074] It should be noted that the second mounting position may be, but is not limited to, a bolt mounting hole. The exposed height of the second limiting rod on the second mounting block is adjustable, which may be achieved by, but is not limited to, threading the second limiting rod into the second mounting block.

[0075] In one embodiment of the present specification, the second limiting rod may be made of a flexible material to avoid the impact on the device caused by the collision between the second mounting block and the second blocking block during the downward adjustment process.

[0076] In one embodiment of this specification, another method for adjusting the height of the second limiter is provided:

[0077] The double-needle printing device further includes a fourth electric vertical lifting subunit mounted on the main frame 1 , and the second limiter is mounted on the fourth electric vertical lifting subunit and performs synchronous lifting movement with the fourth electric vertical lifting subunit.

[0078] It should be noted that in this embodiment, the second limit member is electrically lifted and lowered through the fourth electric vertical lifting subunit, so it is more convenient than the manual installation and adjustment method in the aforementioned embodiment. Moreover, since it is changed to an electrically lifted method, real-time adjustment can be achieved during the printing process.

[0079] Therefore, in this embodiment, the fourth electric vertical lifting sub-unit can adjust the height of the second limiting member in real time based on the second height data when the second printing head prints the second line.

[0080] In this method, the second limiting member can be understood as an integral member. Since the adjustment accuracy of the electronic control method is usually higher, there is no need to use a combination of coarse adjustment and fine adjustment.

[0081] Note: The structure of the second regulating unit is similar to that of the first regulating unit. For detailed description, please refer to the above text description and accompanying drawings of the first regulating unit. No further details will be given here, and the second regulating unit is not marked in the accompanying drawings.

[0082] It should also be noted that for the dual-needle printing device described in multiple embodiments of this specification, more printing needle modules with the same structure can be added to the device. That is, on the basis of the first printing needle module and the second printing needle module, a third printing needle module, a fourth printing needle module, etc. with the same structure as the first printing needle module or the second printing needle module can be added. The specific additions can be made according to actual printing needs. At the same time, it is also necessary to add a limiting module for the additional printing needle module to adjust the lower limit of its printing height. In recent years, "high screen-to-body ratio" and even "full screen" designs have gradually become the mainstream design of electronic products such as mobile phones, tablets, laptops and TVs. One of the most effective ways to increase the screen-to-body ratio is to bend the screen driver IC into the side of the OLED screen through a flexible circuit board. However, during the bending process, how to effectively protect the fragile metal wiring has become one of the most important links.

[0083] A metal cover layer (MCL) is usually formed on the connection area between the flexible circuit board and the display panel before bending to protect the metal traces in the connection area, enhance the resistance and durability of the flexible circuit board, and reduce the risk of bright lines and other risks caused by damage to the metal traces in the connection area during the bending process and subsequent product use.

[0084] The current method of forming a circuit protection layer can refer to Figure 3 As shown, the display device includes a display panel 91 and a flexible circuit board 92 on the side of the display panel 91. The circuit protection layer is a protective layer 93 formed on the side of the display panel 91. The current method for forming the protective layer is to first form a first retaining wall structure 94 on the side of the display panel 91, then use the filler printing module 10 to print a filler between the display panel 91 and the first retaining wall structure 94, and finally cure it to form the protective layer 93.

[0085] However, refer to Figure 3 As shown, the circuit protection layer formed by the above method will appear concave on the side close to the display panel 91, and then will climb sharply, and may overflow to the upper surface of the display panel 91, affecting subsequent packaging and even the display effect, and the film thickness uniformity of the protection layer 93 is poor.

[0086] Therefore, in one embodiment of the present specification, a protective layer printing device for a display device is further provided, wherein the display device includes a display panel 91 and a flexible circuit board 92 on the side of the display panel 91, characterized in that the printing device includes a filling glue printing module 10 and the dual-needle printing device described in the above embodiment;

[0087] The double-needle printing device is used to use the flexible circuit board 92 as a substrate to simultaneously print the first and second circuits spaced apart on the flexible circuit board 92 (see Figure 5 As shown), two retaining wall structures (i.e. Figure 4 、 Figure 5 The first retaining wall structure 94 and the second retaining wall structure 95 are shown in FIG; the filling glue printing module 10 is used to print the filling glue between the two retaining wall structures to form a protective layer 93 on the side of the display panel 91 (refer to FIG. Figure 6 shown).

[0088] As will be appreciated, the protective layer printing device for a display device provided in this embodiment is equipped with at least two retaining wall printing modules (i.e., the first and second printing needles 6 and 5 ). These modules can print two retaining walls in a single step, forming a second retaining wall structure 95 proximate to the display panel 91 and a first retaining wall structure 94 distal to the display panel 91 on the flexible circuit board 92. The area between the first and second retaining wall structures 94 and 95 serves as the location covered by the circuit protective layer, and the filler printing module 10 prints filler to form the circuit protective layer. The circuit protective layer thus formed can be controlled to have comparable dimensions for the two retaining walls. This allows the filler to naturally level between the two retaining walls without causing a sharp slope or sag, resulting in a highly uniform thickness of the resulting circuit protective layer. Furthermore, due to the presence of the retaining wall proximate to the display panel 91, the filler will not climb onto the surface of the display panel 91, thereby preventing subsequent packaging and even the display effect. Furthermore, the two printing modules can print both retaining walls in a single step, eliminating the need for sequential printing required with a single needle, effectively improving operational efficiency. The two separate height compensation modules can be used to adjust the printing parameters of the first and second print head modules, respectively, to ensure that the dimensions of the resulting retaining wall remain consistent to the greatest extent possible, further facilitating uniform thickness of the circuit protection layer. Furthermore, two separate height adjustment lower limit modules, each for the first and second print head modules, minimize collisions between the print heads and the flexible circuit board 92, thereby protecting the flexible circuit board 92.

[0089] The embodiments described above are merely preferred embodiments of this specification and are not intended to limit the scope of this specification. Without departing from the design spirit of this specification, various modifications and improvements made to the technical solutions of this specification by ordinary technicians in this field should fall within the scope of protection determined by the claims of this specification.

Claims

1. A double-needle printing device, characterized in that: include: A main body bracket, a double-needle printing mechanism mounted on the main body bracket for synchronously printing a first line and a second line at intervals on a substrate surface, and a data acquisition module for respectively acquiring first height data of the substrate surface at a location where the first line is printed and second height data at a location where the second line is printed; The double-needle printing mechanism includes a first printing needle module mounted on the main body bracket for printing the first circuit and a second printing needle module for printing the second circuit; The first printing needle module includes a first printing needle and a first adjusting unit mounted on the main body bracket for adjusting the printing height of the first printing needle in real time during printing of the first line based on the first height data; The second printing needle module includes a second printing needle and a second adjustment unit mounted on the main support for adjusting the printing height of the second printing needle in real time during printing of the second line based on the second height data; The dual-needle printing device further includes a first limiting module for adjustably limiting the lower limit of the printing height adjustment of the first printing needle head and a second limiting module for adjustably limiting the lower limit of the printing height adjustment of the second printing needle head; The second adjustment unit includes a third electric vertical lifting sub-unit mounted on the main frame and a transverse slide sub-unit mounted on the third electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit, and the second printing needle is mounted on the transverse slide sub-unit and performs synchronous transverse movements with the transverse slide sub-unit; The second limiting module includes a second blocking block installed on the third electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the third electric vertical lifting sub-unit. The second limiting module also includes a second limiting member installed on the main body bracket in a height-adjustable manner to block and limit the second blocking block when the third electric vertical lifting sub-unit performs a descending movement.

2. A double-needle printing device according to claim 1, characterized in that: The first adjustment unit includes a first electric vertical lifting subunit installed on the main body bracket, and the first printing needle head is installed on the first electric vertical lifting subunit and performs a lifting movement synchronously with the first electric vertical lifting subunit.

3. A double-needle printing device according to claim 2, characterized in that: The first limiting module includes a first blocking block installed on the first electric vertical lifting sub-unit and performing synchronous lifting and lowering movements with the first electric vertical lifting sub-unit. The first limiting module also includes a first limiting member installed on the main body bracket in a height-adjustable manner to block and limit the first blocking block when the first electric vertical lifting sub-unit performs a descending movement.

4. A double-needle printing device according to claim 3, characterized in that: The main frame is provided with a plurality of first mounting positions at different heights, each of which can be provided with the first limiting member, and the main frame is provided with first mounting position height data corresponding to each first mounting position engraved at a position corresponding to each first mounting position; The first limiting member includes a first mounting block, which can be installed in any one of a plurality of first mounting positions. The first limiting member also includes a first limiting rod that is exposed and height-adjustably installed on the first mounting block to block and limit the first blocking block when the first electric vertical lifting sub-unit performs a descending movement. The first limiting rod is engraved with first fine-tuning scale data.

5. A double-needle printing device according to claim 3, characterized in that: The double-needle printing device further comprises a second electric vertical lifting subunit mounted on the main frame, and the first limiting member is mounted on the second electric vertical lifting subunit and performs synchronous lifting movement with the second electric vertical lifting subunit.

6. A double-needle printing device according to claim 5, characterized in that: The second electric vertical lifting subunit adjusts the height of the first limiter in real time based on the first height data during the process of the first printing needle printing the first line.

7. A double-needle printing device according to claim 1, characterized in that: The main frame is provided with a plurality of second mounting positions at different heights, each of which can be equipped with the second limiting member, and the main frame is provided with second mounting position height data corresponding to each second mounting position engraved at a position corresponding to each second mounting position; The second limiting member includes a second mounting block, which can be installed in any one of a plurality of second mounting positions. The second limiting member also includes a second limiting rod installed on the second mounting block in an adjustable manner so as to block and limit the second blocking block when the third electric vertical lifting sub-unit moves downward. The second limiting rod is engraved with second fine-tuning scale data.

8. A double-needle printing device according to claim 1, characterized in that: The double-needle printing device further includes a fourth electric vertical lifting subunit mounted on the main support, and the second limiter is mounted on the fourth electric vertical lifting subunit and performs synchronous lifting movement with the fourth electric vertical lifting subunit.

9. A double-needle printing device according to claim 8, characterized in that: The fourth electric vertical lifting subunit adjusts the height of the second limiter in real time based on the second height data during the process of the second printing needle printing the second line.

10. A protective layer printing device for a display device, wherein the display device comprises a display panel and a flexible circuit board on the side of the display panel, characterized in that: The printing device comprises a filling glue printing module and a double-needle printing device according to any one of claims 1 to 9; The dual-needle printing device is used to use a flexible circuit board as a substrate to simultaneously print the first and second circuits spaced apart on the flexible circuit board, thereby forming two retaining wall structures spaced apart on the flexible circuit board on the side of the display panel; the filling glue printing module is used to print filling glue between the two retaining wall structures to form a protective layer on the side of the display panel.

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