Manufacturing method and manufacturing system of folding cover plate for flexible display screen

Abstract

The application relates to a manufacturing method and a manufacturing system of a folding cover plate for a flexible display screen, and the manufacturing method comprises the following steps: S1, continuously printing frames of the folding cover plate on a CPI material belt, and printing detection marks at the same positions outside each frame; S2, synchronously unwinding the CPI material belt and an OCA material belt, and detecting the printing length of the frame on the CPI material belt through the detection marks; S3, according to the detected printing length of the frame, adjusting the die-cutting length of the OCA material belt, cutting the OCA material belt into OCA material pieces, and pasting the OCA material pieces on the CPI material belt, so that the OCA material pieces cover the frames; and S4, synchronously die-cutting the pasted OCA material pieces and the CPI material belt, and forming single CPI film materials. The manufacturing method reduces the die-cutting process of the CPI material belt, integrates the OCA die-cutting and pasting processes together, reduces intermediate turnover links, can improve the manufacturing efficiency of products, solves the problem of foreign matters in product turnover, improves the qualified rate of products, and has the advantages of high efficiency and high qualified rate.

Description

Technical Field

[0001] This invention relates to the field of flexible display screen manufacturing technology, and in particular to a method and system for manufacturing a folding cover plate for a flexible display screen. Background Technology

[0002] Foldable cover plates for flexible displays are materials used in foldable screen phones or other flexible display devices. They are characterized by repeated bending, transparency, ultra-thinness, and sufficient rigidity. Currently, there are two main types of flexible cover plate materials: CPI film (transparent polyimide film) and UTG ultra-thin glass. This invention mainly focuses on the preparation of CPI film materials.

[0003] Existing CPI membrane materials are formed by laminating CPI film (transparent polyimide film) and OCA (Optically Clear Adhesive, which has a layer of special substrate-free double-sided adhesive that is optically transparent) film. The production process of CPI membrane materials involves printing, die-cutting, lamination, testing, laser and other processes, which are complex and have low processing efficiency.

[0004] The production methods commonly used in the industry are as follows:

[0005] 1. CPI Sheet Printing: CPI rolls are laser-cut into individual sheets. The surface and cut edges are cleaned, and the protective film on one side of the CPI sheet is peeled off. The border is then printed using a sheet-fed screen printing machine, followed by baking in an oven. This process suffers from low printing efficiency and easy contamination of the printed surface, affecting the print yield.

[0006] 2. OCA Die-cutting: OCA rolls are cut into the required sizes using a rotary die-cutting device, and each piece is inspected for appearance.

[0007] 3. Lamination of CPI sheet and OCA sheet: Before lamination, the printed edge surface needs to be coated and dust removed. After dust removal, it is carried out by a fully automatic laminating machine. During the turnover process, foreign objects can easily cause poor lamination, resulting in a lower lamination yield. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the problems of high product defect rate and low production efficiency caused by the complex preparation process of CPI film material in the prior art, which requires multiple die-cutting and transportation. The present invention provides a manufacturing method and system for folding cover plates for flexible displays, which reduces the die-cutting process of CPI strip, integrates OCA die-cutting and bonding processes, reduces intermediate turnover links, not only improves the manufacturing efficiency of the product, but also solves the problem of foreign objects in the product turnover, and improves the product qualification rate.

[0009] To solve the above-mentioned technical problems, the present invention provides a method for manufacturing a folding cover plate for a flexible display screen, comprising the following steps:

[0010] S1. Print the frame of the folded cover plate continuously on the CPI strip, and print the inspection mark at the same position on the outside of each frame.

[0011] S2. Synchronous feed of CPI tape and OCA tape, the printing length of the upper border of CPI tape is detected by the detection mark;

[0012] S3. Based on the printed length of the border obtained from the detection, adjust the die-cutting length of the OCA strip, cut the OCA strip into OCA sheets and apply them to the CPI strip so that the OCA sheets cover the border.

[0013] S4. Simultaneously die-cut the bonded OCA sheet and CPI strip to form a single CPI film.

[0014] In one embodiment of the present invention, in step S1, the CPI tape is formed by unloading CPI roll material, and at the same time as the CPI roll material is unloaded, the protective film applied to the outer layer of the CPI tape is peeled off.

[0015] In one embodiment of the present invention, in step S1, the CPI tape is corrected and positioned before printing the border and detection marking.

[0016] In one embodiment of the present invention, in step S1, a detection block with a printing detection mark size of 3*3mm is printed, and the size of the printed detection mark is much smaller than the size of the border.

[0017] In one embodiment of the present invention, in step S1, after the printing process is completed, the CPI tape is baked to fix the printed border onto the CPI tape.

[0018] In one embodiment of the present invention, in step S1, after the printing process is completed, the CPI tape is wound up, and a protective film is applied to one side of the CPI tape while it is being wound up.

[0019] In one embodiment of the present invention, in step S2, the distance between two adjacent detection mark intervals is detected, which is the printing length of the upper border of the CPI strip.

[0020] In one embodiment of the present invention, it further includes:

[0021] Step S5: Visually inspect the prepared single CPI film material according to the preset standard size and tolerance range to determine whether the single CPI film material is qualified.

[0022] In one embodiment of the present invention, it further includes:

[0023] Step S6: Inspect individual CPI film materials, and mark and sort qualified and unqualified products.

[0024] To address the aforementioned technical problems, the present invention also provides a manufacturing system for a folding cover plate for a flexible display screen, capable of performing the above-mentioned manufacturing method, comprising:

[0025] The printing equipment includes: a feeding mechanism, a film-peeling mechanism, a web-correcting mechanism, a printing mechanism, a baking mechanism, and a laminating and winding mechanism; wherein: the feeding mechanism is used to feed CPI roll material; the film-peeling mechanism is used to peel off the protective film from the CPI strip; the web-correcting mechanism is used to correct the feeding direction on the CPI strip; the printing mechanism is used to print borders and inspection marks on the CPI strip; the baking mechanism is used to fix the borders and inspection marks; and the laminating and winding mechanism is used to wind the CPI strip and apply the protective film during winding.

[0026] A die-cutting and laminating equipment includes: a feeding shaft, a photoelectric sensing device, a die-cutting device, a vision inspection device, and a scribing device; wherein: the feeding shaft is used to simultaneously feed CPI tape and OCA tape; the photoelectric sensing device detects the printed length of the upper border of the CPI tape by sensing and detecting the position of the markings; the die-cutting device includes a first die-cutting blade, a second die-cutting blade, and a film-applying assembly; the first die-cutting blade cuts the OCA tape according to the printed length of the border to form an OCA sheet; the film-applying assembly applies the OCA sheet to the CPI tape; the second die-cutting blade cuts the CPI tape to prepare a single CPI film; the vision inspection device is used to determine whether the CPI film is qualified; and the scribing device marks and distinguishes between qualified and unqualified products.

[0027] The technical solution of the present invention has the following advantages over the prior art:

[0028] The manufacturing method of the flexible display screen folding cover plate of the present invention directly prints the frame on the CPI material strip to prepare the frame, without the need to cut the CPI material strip into individual pieces, which simplifies the cutting process, allows for continuous printing, and improves printing efficiency.

[0029] Furthermore, printing inspection marks simultaneously with the printing of the border allows for the detection of the printed border length, thereby adjusting the die-cutting length of the OCA strip. This integrates the OCA die-cutting and bonding processes, reducing intermediate handling steps, which not only improves product manufacturing efficiency but also solves the problem of foreign objects during product handling and increases the product qualification rate. Attached Figure Description

[0030] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0031] Figure 1 This is a flowchart of the manufacturing method of the folding cover plate for the flexible display screen of the present invention;

[0032] Figure 2 This is a schematic diagram of the border and inspection mark printed on the CPI tape according to the present invention;

[0033] Figure 3 This is a schematic diagram of the mechanism distribution in the printing equipment of the present invention;

[0034] Figure 4 This is a schematic diagram of the mechanism distribution in the die-cutting and bonding equipment of the present invention;

[0035] Explanation of reference numerals in the accompanying drawings: 11. Feeding mechanism; 12. Film tearing mechanism; 13. Straightening mechanism; 14. Printing mechanism; 15. Baking mechanism; 16. Coating and winding mechanism; 21. Feeding shaft; 22. Photoelectric sensing device; 23. Die-cutting device; 24. Vision inspection device; 25. Marking device; 3. Border; 4. Inspection mark. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0037] Example 1

[0038] Reference Figure 1 As shown, this invention discloses a method for manufacturing a folding cover plate for a flexible display screen, comprising the following steps:

[0039] S1. Print the frame 3 of the folded cover plate continuously on the CPI strip, and print the inspection mark 4 at the same position on the outside of each frame 3.

[0040] Specifically, since the CPI tape is relatively long, it is transported in roll form when it arrives. Therefore, the CPI tape is formed by unloading the CPI roll. In order to prevent the CPI tape from being contaminated during transportation, a protective film is applied to one side of the CPI tape. In this way, adjacent layers of CPI tape are isolated by the protective film in the CPI roll. In this embodiment, the protective film applied to the outer layer of the CPI tape is peeled off while the CPI roll is being unloaded.

[0041] Specific peeling method: A roll-to-roll method can be used, with a feed roll feeding the CPI roll material and a take-up roll winding the protective film. This way, the protective film can be peeled off and collected at the same time.

[0042] In this embodiment, the border 3 is printed directly on the CPI tape without cutting the CPI tape into individual pieces. In other words, the entire CPI tape needs to pass through the printing equipment. Compared to printing on cut CPI sheets, it is impossible to position the entire CPI tape. Therefore, in order to ensure that the extension direction of the printed border 3 is the same as the extension direction of the CPI tape, the angle and direction of the CPI tape entering the printing equipment need to be restricted before printing. In this embodiment, the CPI tape is corrected and positioned before printing the border 3 and the detection mark 4.

[0043] In this embodiment, in order to detect the length of the border 3 and provide an adjustment basis for subsequent die-cutting of the OCA sheet, a detection mark 4 is also printed along with the border 3. This detection mark 4 is not part of the product, but rather an additional part. Therefore, referring to... Figure 2 As shown, when the detection mark 4 is actually printed, it is only printed at one corner outside the frame 3, without affecting the structure of the entire frame 3. Furthermore, the size of the printed detection mark 4 is a 3*3mm detection block, which is much smaller than the size of the frame 3. This size is a size that can be detected by the optical sensor and will not affect the entire frame 3. After the detection is completed, the detection mark 4 can also be cut off in subsequent processes according to the customer's actual needs.

[0044] Specifically, in order to quickly form the border 3 and inspection mark 4 printed on the CPI tape, the CPI tape is baked after the printing process is completed, so that the printed border 3 is fixed on the CPI tape. At the same time, after baking, the CPI tape is rolled up. During the rolling, a protective film is applied to one side of the CPI tape. By adopting the method of printing, baking and film coating at the same time, the problems of slow baking efficiency of oven racks and easy contamination of the printed surface during turnover are avoided, which can improve the printing yield.

[0045] The manufacturing method of the flexible display screen folding cover plate of the present invention directly prints the frame 3 on the CPI material strip, without the need to cut the CPI material strip into individual pieces, which simplifies the cutting process, allows for continuous printing, and improves printing efficiency.

[0046] S2. The CPI tape and OCA tape are simultaneously fed into the production line. The printing length of the upper border 3 of the CPI tape is detected by the detection mark 4.

[0047] Specifically, the distance between two adjacent detection marks 4 is the printing length of the upper border 3 of the CPI tape. In this embodiment, a detection block with a size of 3*3mm is set for the detection mark 4. This detection block can be detected by a photoelectric sensing device. During the transportation of the CPI tape, after the photoelectric sensing device detects two adjacent detection blocks, the distance between the two detection blocks can be determined, thereby obtaining the printing length of the border 3.

[0048] S3. Based on the printed length of the border 3 obtained by detection, adjust the die-cutting length of the OCA strip, cut the OCA strip into OCA sheets and apply them to the CPI strip so that the OCA sheets cover the border 3.

[0049] In this embodiment, a die-cutting blade moves with the OCA strip and completes the die-cutting of the OCA strip. For example, the photoelectric sensor detects that the printed sheet length of the frame 3 is X1. At this time, the data is sent to the die-cutting blade and compared with the length X2 that the die-cutting blade has traveled. The difference between X1 and X2 is the printing length error value. This difference value is output to the station where the die-cutting blade is located for difference adjustment. After the die-cutting blade adjusts the die-cutting position, the OCA strip is cut into OCA sheet and applied to the CPI strip so that the OCA sheet covers the frame 3.

[0050] S4. Simultaneously die-cut the bonded OCA sheet and CPI strip to form a single CPI film.

[0051] Using the above method, the detection mark 4 is printed at the same time as the border 3. By detecting the distance between two adjacent detection marks 4, the printing length of the border 3 can be detected, thereby adjusting the die-cutting length of the OCA strip. This integrates the OCA die-cutting and bonding processes, reduces intermediate turnover links, improves product manufacturing efficiency, solves the problem of foreign objects during product turnover, and also improves the product qualification rate.

[0052] Specifically, refer to Figure 1 As shown, in preparing the CPI membrane material into single sheets, the product also needs to be tested and sorted. In this embodiment, the following steps are also included:

[0053] S5. Visually inspect the prepared single CPI film material according to the preset standard size and tolerance range to determine whether the single CPI film material is qualified.

[0054] S6. Inspect individual CPI membrane materials, and identify and sort qualified and unqualified products.

[0055] Example 2

[0056] In order to implement the method of Embodiment 1 above, the present invention also discloses a manufacturing system for a folding cover plate for a flexible display screen, including a printing device and a die-cutting and bonding device. The printing device is capable of completing the process of step S1 above, and the die-cutting and bonding device is capable of completing the processes of steps S2 to S5 above.

[0057] Reference Figure 3 As shown, the printing equipment includes: a feeding mechanism 11, a film-tearing mechanism 12, a web-correcting mechanism 13, a printing mechanism 14, a baking mechanism 15, and a film-coating and winding mechanism 16.

[0058] The feeding mechanism 11 is used to feed CPI rolls, and the film-tearing mechanism 12 works in conjunction with the feeding mechanism 11 to form a roll-to-roll feeding method. The feeding mechanism 11 feeds CPI rolls, and the film-tearing mechanism 12 winds up the protective film. In this way, the protective film can be peeled off and collected at the same time.

[0059] The correction mechanism 13 is used to correct the direction of the CPI tape. Before printing, the correction mechanism 13 needs to restrict the angle and direction of the CPI tape entering the printing equipment to ensure that the extension direction of the printed border 3 is the same as the extension direction of the CPI tape.

[0060] The printing mechanism 14 is used to print a border 3 and a detection mark 4 on the CPI tape. The size of the border 3 is determined according to the size and shape of the product. The size of the detection mark 4 is a 3*3mm detection block. The size of the printed detection mark 4 is much smaller than the size of the border 3. This size is a size that can be detected by the optical sensor and will not affect the entire border 3. After the detection is completed, the detection mark 4 can also be cut off in subsequent processes according to the actual needs of the customer.

[0061] The baking mechanism 15 heats and bakes the entire CPI strip, so that the printed border 3 and the detection mark 4 are quickly cured and formed, avoiding contamination.

[0062] Specifically, the baking mechanism 15 is a continuous oven, and the film coating and winding mechanism 16 is set in the continuous oven. The film coating and winding mechanism 16 is used to wind up the CPI tape and apply a protective film at the same time as winding. This can complete the process of printing and baking and coating at the same time, avoiding the problems of slow baking efficiency and easy contamination of the printing surface in the oven, and improving the printing yield.

[0063] Reference Figure 4 As shown, the die-cutting and bonding equipment includes: a feeding shaft 21, a photoelectric sensing device 22, a die-cutting device 23, a vision inspection device 24, and a scribing device 25;

[0064] Two feeding shafts 21 are set up to realize the synchronous feeding action of CPI material strip and OCA material strip;

[0065] The photoelectric sensing device 22 detects the printing length of the upper border 3 of the CPI tape by sensing the position of the detection mark 4;

[0066] The die-cutting device 23 includes a first die-cutting blade, a second die-cutting blade, and a film-applying assembly. The first die-cutting blade cuts the OCA strip according to the printed length of the border 3 to form an OCA sheet. The film-applying assembly applies the OCA sheet to the CPI strip. The second die-cutting blade cuts the CPI strip to prepare a single CPI film.

[0067] The visual inspection device 24 is used to determine whether the CPI film material is qualified;

[0068] The marking device 25 distinguishes between qualified and unqualified products. The marking device 25 marks unqualified products with lines, so that unqualified products can be quickly identified based on the markings and can be easily removed.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for manufacturing a folding cover plate for a flexible display screen, characterized in that, Includes the following steps: S1. Print the frame of the folded cover plate continuously on the CPI strip, and print the inspection mark at the same position on the outside of each frame. S2. Synchronous feed of CPI tape and OCA tape, the printing length of the upper border of CPI tape is detected by the detection mark; S3. Based on the printed length of the border obtained from the detection, adjust the die-cutting length of the OCA strip, cut the OCA strip into OCA sheets and apply them to the CPI strip so that the OCA sheets cover the border. S4. Simultaneously die-cut the bonded OCA sheet and CPI strip to form a single CPI film.

2. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S1, the CPI tape is formed by unloading CPI roll material. At the same time as the CPI roll material is unloaded, the protective film applied to the outer layer of the CPI tape is peeled off.

3. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S1, the CPI tape is corrected and positioned before printing the border and inspection mark.

4. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S1, a detection block with a printing detection mark size of 3*3mm is printed, and the size of the printed detection mark is much smaller than the size of the border.

5. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S1, after the printing process is completed, the CPI tape is baked to fix the printed border onto the CPI tape.

6. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S1, after the printing process is completed, the CPI tape is wound up, and a protective film is applied to one side of the CPI tape while it is being wound up.

7. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: In step S2, the distance between two adjacent detection marks is detected, which is the printing length of the upper border of the CPI strip.

8. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: Also includes: Step S5: Visually inspect the prepared single CPI film material according to the preset standard size and tolerance range to determine whether the single CPI film material is qualified.

9. The method for manufacturing a folding cover plate for a flexible display screen according to claim 1, characterized in that: Also includes: Step S6: Inspect individual CPI film materials, and mark and sort qualified and unqualified products.

10. A manufacturing system for a folding cover plate for a flexible display screen, capable of performing the manufacturing method described in any one of claims 1 to 9, characterized in that: include: The printing equipment includes: a feeding mechanism, a film-peeling mechanism, a web-correcting mechanism, a printing mechanism, a baking mechanism, and a laminating and winding mechanism; wherein: the feeding mechanism is used to feed CPI roll material; the film-peeling mechanism is used to peel off the protective film from the CPI strip; the web-correcting mechanism is used to correct the feeding direction on the CPI strip; the printing mechanism is used to print borders and inspection marks on the CPI strip; the baking mechanism is used to fix the borders and inspection marks; and the laminating and winding mechanism is used to wind the CPI strip and apply the protective film during winding. A die-cutting and laminating equipment includes: a feeding shaft, a photoelectric sensing device, a die-cutting device, a vision inspection device, and a scribing device; wherein: the feeding shaft is used to simultaneously feed CPI tape and OCA tape; the photoelectric sensing device detects the printed length of the upper border of the CPI tape by sensing the position of the marked area; the die-cutting device includes a first die-cutting blade, a second die-cutting blade, and a film-applying assembly; the first die-cutting blade cuts the OCA tape according to the printed length of the border to form an OCA sheet; the film-applying assembly applies the OCA sheet to the CPI tape; the second die-cutting blade cuts the CPI tape to prepare a single CPI film; the vision inspection device is used to determine whether the CPI film is qualified; and the scribing device marks and distinguishes between qualified and unqualified products.

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