Main grid screen printing plate for improving alignment precision of photovoltaic cell and screen printing plate kit

Abstract

The utility model relates to the field of solar cells, in particular to a main grid screen printing plate and a screen printing plate kit capable of improving alignment accuracy of photovoltaic cells, the main grid screen printing plate comprises a first number of main grid screen printing plate lines which are parallel to one another, and main grid opening fish fork ends are arranged at two ends of each main grid screen printing plate line. Main grid antennas perpendicular to the main grid screen printing plate lines are arranged at the main grid opening fish fork ends at the two ends of the two corner main grid screen printing plate lines, and the main grid antennas are used for being aligned with printing patterns in the previous procedure and the next procedure of the main grid electrode printing procedure. According to the utility model, the alignment precision of the main gate electrode and the previous and later processes can be improved, and the fault tolerance during batch production is improved.

Description

Technical Field

[0001] The utility model relates to the field of solar cells, in particular to a main grid screen and a screen kit for improving the alignment accuracy of photovoltaic cells. Background Art

[0002] PERC cell (Passivated Emitter and Rear Cell) is an advanced solar cell technology. In the field of PERC cell production, single crystal PERC cell basically uses SE technology (Selective Emitter). This technology requires the alignment of the laser groove and the printed fine grid in the SE process to improve the photoelectric conversion efficiency. If a relative offset occurs, it will lead to photoelectric efficiency loss and defective products.

[0003] In the related art, currently, in order to achieve the alignment between the SE laser groove and the fine grid, the adjustment method is to confirm the alignment between the main grid and the SE laser groove and the alignment effect between the fine grid and the main grid through a microscope, so as to achieve the alignment between the fine grid and the laser groove. In the actual production process, it is difficult to distinguish and confirm with the naked eye, and frequent observation with a microscope is required. It is also difficult to determine whether it is the optimal alignment level, resulting in low fault tolerance during continuous production. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a main grid screen and screen kit for improving the alignment accuracy of photovoltaic cells, which can improve the alignment accuracy between laser-main grid-fine grid and improve the fault tolerance during mass production.

[0005] In the first aspect, according to an embodiment of the utility model, a main grid screen for improving the alignment accuracy of photovoltaic cells is provided, which is used for printing main grid electrodes. The main grid screen includes a first number of parallel main grid screen lines, and main grid opening harpoon ends are provided at both ends of each of the main grid screen lines. Main grid antennae perpendicular to the main grid screen lines are provided on the main grid opening harpoon ends at both ends of two corner main grid screen lines, and the main grid antennae are used to align with the printing patterns of the preceding process and the succeeding process of printing the main grid electrodes.

[0006] According to the embodiment of the utility model, a main grid screen and screen kit for improving the alignment accuracy of photovoltaic cells have at least the following beneficial effects:

[0007] The utility model adds small antennae to the corners of the main grid, and aligns the laser groove lines with the antennae, and aligns the fine grid lines with the antennae, so as to improve the alignment accuracy between the laser-main grid-fine grid and improve the fault tolerance during mass production. Compared with the prior art, the antennae position can be observed with the naked eye to determine whether an offset has occurred, and adjustments can be made according to the antennae area, while the prior art must be adjusted with the aid of a microscope, and the adjustment is slow. The utility model can simplify the interception of defects on the production line and enable rapid adjustments.

[0008] According to some embodiments of the present invention, the main grid antenna is an isosceles trapezoidal structure, wherein the lower base is less than 100um, the upper base is higher than 30um, and the trapezoidal height is 100um-2mm.

[0009] According to some embodiments of the present invention, the main grid screen has a mesh count of 280-480 meshes.

[0010] According to an embodiment of the utility model, a screen set for improving the alignment accuracy of photovoltaic cells includes a main grid screen and a photovoltaic cell panel etched with laser groove lines, wherein the main grid antennae of the main grid screen are aligned with the laser groove lines so that the main grid lines are printed on the photovoltaic cell panel perpendicular to the laser groove lines.

[0011] According to some embodiments of the present invention, the width of the laser groove line is between 100um and 120um, and the number of laser groove line entries is between 380 and 520.

[0012] According to some embodiments of the utility model, the screen kit also includes a fine grid screen, which includes fine grid screen lines whose number is equal to that of the laser groove line entries, and the fine grid screen lines are aligned with the main grid antennae so that the silver fine grid lines are printed on the laser groove lines printed with the main grid lines.

[0013] According to some embodiments of the present invention, the spacing of the silver fine grid lines is the same as the spacing of the laser groove lines, the mesh count is between 380-520, and the width is between 20um-40um.

[0014] According to some embodiments of the present invention, a main grid antenna is provided at each position on the main grid screen line corresponding to the laser groove line or the silver fine grid line.

[0015] According to some embodiments of the present invention, four positioning points are arranged in four preset corner areas on the main grid screen, and the positioning points are used for grasping and aligning after the main grid antenna is aligned with the laser groove line or the main grid antenna is aligned with the silver fine grid line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 A schematic diagram of a main grid plate in the related technology provided by an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of aligning the main grid with the laser groove in the related art provided by the embodiment of the utility model;

[0019] Figure 3 A schematic diagram of alignment between a main grid and a fine grid in the related art provided by an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of a main grid plate for improving the alignment accuracy of photovoltaic cells provided by an embodiment of the utility model;

[0021] Figure 5 A schematic diagram of aligning a main grid plate and a laser groove to improve the alignment accuracy of a photovoltaic cell provided by an embodiment of the utility model;

[0022] Figure 6 An actual alignment diagram of a main grid plate and a laser groove for improving the alignment accuracy of a photovoltaic cell provided by an embodiment of the utility model;

[0023] Figure 7 A schematic diagram of a main grid and a fine grid misalignment for improving the alignment accuracy of a photovoltaic cell provided by an embodiment of the utility model;

[0024] Figure 8 An actual alignment diagram of a main grid and a fine grid for improving the alignment accuracy of a photovoltaic cell provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0027] First, some nouns involved in this application are analyzed:

[0028] PERC Cell (Passivated Emitter and Rear Cell): PERC cell is a solar cell technology that aims to improve the efficiency of solar cells. This technology reduces the probability of electron recombination by adding a special passivation layer (Passivation Layer) and a local back surface field (LBSF) to the back of the solar cell, thereby improving the photoelectric conversion efficiency of the cell. With PERC technology, the efficiency of solar cells can be significantly improved. Compared with traditional solar cells, the conversion efficiency of PERC cells can generally be improved by about 0.5% to 1%. Although it sounds like a small improvement, in the field of solar cells, such an improvement is already very significant, especially considering the scale of solar projects, even a small efficiency improvement can bring a significant increase in energy output. With the continuous advancement of solar technology and the gradual reduction of costs, PERC technology has become an important trend in solar cell manufacturing. In the future, with the continuous optimization of PERC technology and the further reduction of costs, it is expected that its application in the solar market will be more extensive.

[0029] SE technology (Selective Emitter): Applied in the manufacture of solar cells. In traditional monocrystalline silicon solar cells, the silicon surface is uniformly doped to improve its conductivity. However, this uniform doping introduces additional electron-hole recombination centers on the surface and back of the solar cell, which increases the recombination probability of carriers (electrons and holes) and reduces the efficiency of the cell. SE technology creates areas with high doping concentration (high conductivity) and low doping concentration (low conductivity) by implementing selective doping on the emission layer of the cell. The highly doped areas are mainly located near the electrode contact points of the cell to reduce contact resistance, while the low doped areas are located in large areas between the electrodes to reduce electron-hole recombination.

[0030] In the field of PERC cell production, monocrystalline PERC cells basically use SE technology, which requires the SE process laser groove and printed fine grid to be aligned to improve the photoelectric conversion efficiency. If a relative offset occurs, it will lead to photoelectric efficiency loss and defective products. After the SE process uses laser etching on the diffusion surface of the cell, a laser groove pattern with a width of 100-120um is formed in the etched area. The laser groove spacing and laser pattern size are the same as the printed fine grid screen. Under the action of high-energy laser, the square resistance of this area can be reduced by 50-80Ω compared to the non-laser area. This technology requires the printed fine grid to overlap with the laser groove area to improve the photoelectric conversion efficiency. On the contrary, the offset will cause printing to the area outside the laser groove (area with high square resistance), which will reduce the photoelectric conversion efficiency and will be reduced to a defective product during the detection and screening process.

[0031] In related technologies, such as Figure 1 As shown, Figure 1 In order to achieve the alignment between the SE laser groove and the fine grid, the adjustment method is usually to confirm the alignment between the main grid and the SE laser groove and the fine grid and the main grid through a microscope, so as to achieve the alignment between the fine grid and the laser groove. How to judge the alignment between the main grid and the laser groove? Currently, we can only check whether the two ends of the main grid are in the middle of the laser groove. Figure 2 As shown, Figure 2 The horizontal thin line area in the middle is the effect of the laser groove, and the vertical thin line area is the main grid line. The main grid opening harpoon end is adjusted to align with the outermost laser groove to meet the process requirements of main grid and laser alignment. The situation shown in the figure is not aligned; Figure 3 As shown, Figure 3 The horizontal thin line area in the middle is the effect of printing fine grid, and the vertical thin line area is the main grid line. By adjusting the open harpoon end of the main grid to align with the outermost fine grid, the process requirements of aligning the main grid and the fine grid are met. Whether the fine grid and the main grid are aligned can only be judged by whether the two ends of the main grid and the fine grid frame line are protruding and whether there is a gap on one side. As shown in the partial enlarged view in the figure, there is still a gap between the open harpoon end and the outermost fine grid. At this time, the main grid and the fine grid are not aligned.

[0032] In the actual production process, the above two alignment methods of laser groove and main grid, main grid and fine grid are difficult to identify and confirm with the naked eye due to the laser groove being between 100-120um and the fine grid width being between 30-40um. Frequent observation under a microscope is required, and it is also difficult to determine whether it is at the optimal level, resulting in low fault tolerance during continuous production.

[0033] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a main grid screen and screen kit for improving the alignment accuracy of photovoltaic cells, adding small tentacles at the corners of the main grid, aligning the laser groove lines with the tentacles, and aligning the fine grid lines with the tentacles, which can improve the alignment accuracy between the laser-main grid-fine grid and improve the fault tolerance during mass production.

[0034] like Figure 4 As shown, according to the first aspect of the embodiment of the utility model, a main grid screen for improving the alignment accuracy of photovoltaic cells includes a first number of main grid screen lines parallel to each other, and main grid opening harpoon ends are provided at both ends of each main grid screen line, and main grid antennae 110 perpendicular to the main grid screen lines are provided on the main grid opening harpoon ends at both ends of the two corner main grid screen lines. The main grid antennae 110 are used to align with the printing patterns of the preceding process and the succeeding process of printing the main grid electrode.

[0035] By providing the main grid opening harpoon ends at both ends of the main grid screen line, and adding the main grid feeler 110 perpendicular to the main grid screen line on the harpoon ends of the corner main grid screen line, the alignment accuracy in the process of printing the main grid electrode can be improved. Such a design can ensure that in the production process of photovoltaic cells, whether it is the front-end or the back-end process, the printed pattern can be aligned more accurately, thereby improving the overall performance and efficiency of the photovoltaic cell.

[0036] In some embodiments, the front-end process is laser etching grooves: This step involves using laser technology to etch tiny grooves on the silicon wafer (solar panel). These grooves are used to isolate different areas on the solar panel to ensure effective flow of current. The accuracy of laser etching directly affects the efficiency and performance of the battery.

[0037] In some embodiments, the back-end process is to use fine grid screen printing to print fine grid lines: on the solar panel after laser etching, fine grid lines are added by printing technology. These fine grid lines are conductive paths connecting different areas on the solar panel and are essential for collecting and conducting the current generated by the photovoltaic effect. The precise printing of fine grid lines is the key to improving the efficiency of the solar cell.

[0038] By setting the busbar opening harpoon ends at both ends of the busbar screen line and adding busbar feelers perpendicular to the busbar screen line at the corners, higher alignment accuracy can be achieved. In this way, when performing laser etching and printing fine grid lines, accurate alignment between each step can be ensured to reduce production errors. The improvement of alignment accuracy specifically means:

[0039] Reduced resistance losses: By ensuring precise alignment of the laser grooves and fine grid lines, resistance can be minimized and the cell’s conversion efficiency can be increased.

[0040] Improved cell performance: Precise alignment not only improves cell efficiency, but also increases the area receiving sunlight by reducing grid line width, further improving the performance of the panel.

[0041] Reduce costs: Reduce the scrap rate caused by inaccurate alignment, improve production efficiency, and thus reduce production costs.

[0042] In some embodiments, when the four main grid antennae 110 are aligned with the laser grooves and the fine grids, it can be ensured that all the laser grooves are aligned with the fine grids. At the same time, if the fine grids and the main grids are offset, the position of the main grid antennae 110 will also be offset accordingly. The width of the main grid antennae 110 area visible to the naked eye = the fine grid width + the width of part of the main grid antennae 110 (the greater the offset, the wider it is). In the event of an offset, the naked eye can see that the position of the main grid antennae 110 is thickened relative to the nearby fine grids, which can confirm that an offset has occurred. The normal alignment can be restored by making corresponding adjustments according to the direction of the thickening.

[0043] In some embodiments, the main grid antenna 110 can be an isosceles trapezoidal structure, wherein the lower base is less than 100 μm, the upper base is higher than 30 μm, and the trapezoidal height is 100 μm-2 mm. The dimensional details of this specific main grid antenna 110 design, i.e., the isosceles trapezoidal structure, are of great significance for achieving high alignment accuracy. By setting the lower base to be less than 100 microns (μm), the upper base to be higher than 30 microns (μm), and the trapezoidal height to be in the range of 100 microns (μm) to 2 millimeters (mm), the alignment accuracy of the main grid antenna 110 with the front process (laser etching groove) and the back process (printing fine grid lines) can be optimized. This design takes into account the following key factors:

[0044] Size adaptability: Through carefully designed dimensions, the main grid antenna 110 can better adapt to laser grooves and grid lines of different sizes, ensuring accurate alignment during the printing process.

[0045] Improved stability: The isosceles trapezoidal structure provides a stable base, which helps to maintain the stability of the main grid throughout the printing process and reduce errors caused by vibration or other external factors.

[0046] In some embodiments, the main grid antenna 110 may also be rectangular. Compared with complex geometric shapes, rectangular structures are easier to design and manufacture, which helps to reduce production costs and improve manufacturing efficiency. When selecting a suitable shape of the main grid antenna 110, it is necessary to comprehensively consider the alignment requirements, cost control, production efficiency and performance of the final product during the production process, which is not limited in this embodiment.

[0047] In some embodiments, the main grid screen mesh count of the main grid screen can be between 280-480 meshes. This range refers to the number of main grid screen lines on the main grid screen, which is used to measure the fineness of the screen. This parameter is crucial for printing the main grid lines of photovoltaic cells (i.e., the main conductive path on the battery). Selecting the appropriate screen mesh count has a significant impact on optimizing printing quality, improving battery efficiency and reducing production costs. A higher mesh count means finer meshes, which can achieve more sophisticated printing patterns. This is especially important for printing fine grid lines of photovoltaic cells, which need to be precisely controlled to optimize the performance of the battery. Selecting a suitable mesh count within the range of 280-480 meshes can be determined based on specific printing requirements and production conditions.

[0048] In some embodiments, the specific printing implementation steps may be:

[0049] S1: Add main grid antennae 110 at the four corners of the main grid screen;

[0050] S2: Main grid screen printing debugging, check whether the main grid feeler 110 deviates from the laser slot, and make a rough adjustment to achieve a quick adjustment effect. After the rough adjustment, use a microscope to make a fine adjustment.

[0051] S3: Fine grid screen printing debugging, check whether the feeler position is thickened. If it is thickened, it means that there is an offset between the four same feelers. Adjust the offset to ensure that there is no thickening.

[0052] Through the alignment of steps S2 and S3, the main grid antenna 110 is aligned with the laser groove, and the main grid antenna 110 is aligned with the fine grid line, thereby achieving the alignment of the fine grid line with the laser groove.

[0053] According to the second aspect of the utility model, a screen set for improving the alignment accuracy of photovoltaic cells includes the above-mentioned main grid screen and a photovoltaic cell panel etched with laser groove lines, wherein the main grid antenna 110 of the main grid screen is aligned with the laser groove lines so that the main grid lines are printed perpendicular to the laser groove lines on the photovoltaic cell panel etched with the laser groove lines.

[0054] Among them, by ensuring that the main grid lines are printed perpendicular to the laser groove lines, the current conduction path inside the solar panel can be optimized, the resistance loss can be reduced, and the overall conversion efficiency of the battery can be improved. This screen kit simplifies the printing process through the preset alignment structure, making it easier and more reliable to achieve high-precision alignment during the production process, thereby reducing manufacturing complexity and error rate.

[0055] like Figure 5 As shown, Figure 5 Schematic diagram of aligning the main gate with the laser groove after adding the main gate antenna 110 to the main gate. By designing the pattern, as shown in the partial enlarged view, the main gate antenna 110 is added in the circle area corresponding to the main gate position. The alignment between the laser groove and the main gate only needs to ensure that the laser groove is at the center of the main gate antenna 110, which is the best level of alignment.

[0056] like Figure 6 As shown, Figure 6 This is an actual alignment image of the main grid antenna 110 and the laser groove under a microscope. First, check whether the main grid antenna 110 deviates from the laser groove and make a rough adjustment to achieve a quick adjustment effect. After the rough adjustment, use a microscope to make a fine adjustment.

[0057] In some embodiments, the width of the laser groove line is between 100um-120um, and the number of laser groove line entries is between 380-520. By precisely controlling the width and mesh count of the laser groove lines, the active area and the inactive area on the panel can be effectively balanced, thereby optimizing the performance of the panel. At the same time, this also requires the use of high-precision equipment and technology in the photovoltaic cell manufacturing process to ensure that these parameters can be accurately achieved. Throughout the photovoltaic cell production process, from laser etching to subsequent printing processes, highly precise alignment and control are required to achieve the best effect of these design parameters.

[0058] In some embodiments, the screen set of the present invention further includes a fine grid screen, which includes fine grid screen lines equal to the number of laser groove line entries, and the fine grid screen lines are aligned with the main grid antenna 110 to allow the silver fine grid lines to be printed on the laser groove lines printed with the main grid lines.

[0059] The application of the fine grid screen ensures that the silver fine grid lines can be correctly and accurately printed on the predetermined laser groove lines through precise alignment with the main grid antenna 110. This precise alignment is crucial to reducing resistance loss on the solar panel and improving solar cell efficiency.

[0060] In some embodiments, the spacing of the silver fine grid lines is the same as the spacing of the laser groove lines, the mesh number is between 380-520, and the width is between 20um-40um. The spacing of the silver fine grid lines is the same as the spacing of the laser groove lines, which means that each laser groove is covered by a silver fine grid line. This one-to-one design helps to maximize the current collection efficiency and reduce the resistance inside the photovoltaic cell.

[0061] The width is set between 20um and 40um, which helps ensure that the fine grid lines can effectively collect and transmit current without blocking too much sunlight and affecting the photoelectric conversion efficiency of photovoltaic panels. In addition, the thinner grid lines also help reduce the amount of silver used, further reducing costs.

[0062] In some embodiments, each position on the main grid line corresponding to the laser groove line or the silver fine grid line is provided with a main grid feeler 110. By providing the main grid feeler 110 at each position corresponding to the laser groove line or the silver fine grid line, the main grid line can be accurately aligned with the laser groove and the silver fine grid line on the solar panel. This one-to-one alignment method helps to ensure that each main grid line can accurately fall on the predetermined position during the printing process, thereby improving the electrical performance and efficiency of the entire solar panel.

[0063] In some embodiments, four positioning points 120 are provided in four preset corner regions on the main grid screen, and the positioning points are used for grabbing and aligning after the main grid antenna 110 is aligned with the laser groove line or the main grid antenna 110 is aligned with the silver fine grid line.

[0064] Among them, the positioning points 120 are set at the four corners of the screen, which correspond to the four cameras of the machine above the field of view to prevent the camera from capturing two points at the same time, causing interference and positioning errors. The alignment between the laser groove, the main grid and the fine grid is captured and aligned through four positioning points 120. After debugging, the alignment difference will continue to exist, that is, the alignment will always be aligned, and the offset will continue to exist. The main grid feeler 110 is added at the four corners. By determining the alignment between the main grid feeler 110 and the laser, and the main grid feeler 110 and the fine grid, the offset adjustment can be performed. For example, if the fine grid-main grid offset occurs, it will occur at the naked eye level. Figure 7 In the case shown, the horizontal thin line area is the fine grid, and the vertical thin line part is the main grid. In the above figure, when the main fine grid is offset, the position of the main grid feeler 110 marked in the circle is obviously thickened in the offset direction. The effect of normal alignment is as follows Figure 8 , the main grid antenna 110 and the fine grid overlapping area will not be thickened.

[0065] The utility model adds a main grid antenna at the corner position of the main grid, and aligns the laser groove line with the main grid antenna, and aligns the fine grid line with the main grid antenna, so as to improve the alignment accuracy between the laser-main grid-fine grid and the fault tolerance in mass production. Compared with the prior art, the main grid antenna position can be observed with the naked eye to determine whether an offset occurs, and can also be adjusted according to the main grid antenna area, while the prior art must use a microscope to make adjustments, and the adjustment is slow. The utility model can simplify the defect interception of the production line and can make adjustments quickly.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A main grid plate for improving the alignment accuracy of photovoltaic cells, characterized in that: For printing main grid electrodes, including: The main grid screen includes a first number of main grid screen lines parallel to each other, and main grid opening harpoon ends are provided at both ends of each main grid screen line. Main grid antennae perpendicular to the main grid screen lines are provided on the main grid opening harpoon ends at both ends of two corner main grid screen lines, and the main grid antennae are used to align with the printing patterns of the preceding process and the succeeding process of printing the main grid electrode.

2. The main grid plate according to claim 1, characterized in that: The main grid antenna is an isosceles trapezoidal structure, wherein the lower base is less than 100um, the upper base is higher than 30um, and the trapezoidal height is 100um-2mm.

3. The main grid screen according to claim 1, characterized in that: The main grid screen has a mesh count of 280-480 meshes.

4. A screen set for improving the alignment accuracy of photovoltaic cells, comprising a main grid screen as claimed in any one of claims 1 to 3 and a photovoltaic cell panel etched with laser groove lines, wherein: The main grid antennae of the main grid screen are aligned with the laser groove lines, so that the main grid lines are printed on the photovoltaic cell panel perpendicular to the laser groove lines.

5. The screen kit according to claim 4, characterized in that: The width of the laser groove line is between 100um and 120um, and the number of laser groove line entries is between 380 and 520.

6. The screen kit according to claim 4, characterized in that: It also includes a fine grid screen, which includes fine grid screen lines with the same number as the laser groove line entries, and the fine grid screen lines are aligned with the main grid antennae to allow silver fine grid lines to be printed on the laser groove lines printed with the main grid lines.

7. The screen kit according to claim 6, characterized in that: The spacing of the silver fine grid lines is the same as the spacing of the laser groove lines, the mesh number is between 380-520, and the width is between 20um-40um.

8. The screen kit according to claim 6, characterized in that: A main grid feeler is provided at each position on the main grid screen line corresponding to the laser groove line or the silver fine grid line.

9. The screen kit according to claim 6, characterized in that: Four positioning points are arranged in four preset corner areas on the main grid screen, and the positioning points are used for grabbing and aligning after the main grid feeler is aligned with the laser groove line or the main grid feeler is aligned with the silver fine grid line.

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