A decorative sticker with built-in flexible circuit LED enhanced decoration and a production method thereof

Abstract

The present invention relates to a decorative sticker with built-in flexible circuit LED enhanced decoration and a production method thereof, which comprises a flexible bottom film and a top film, wherein an LED light-emitting component is arranged on the top surface or inside of the bottom film, wherein the LED light-emitting component comprises a flexible circuit and a battery, a switch and a plurality of LED chips electrically connected to the flexible circuit, wherein text and / or patterns are printed on the top surface of the top film and a plurality of light-transmitting holes are formed on the top film, wherein the top film is bonded and fixed to the top surface of the bottom film and the light-transmitting holes correspond to the LED chips one by one. The production method thereof comprises the preparation of the bottom film, the preparation of the top film and the gluing and forming. The advantages of the present invention are that the RFID production technology is applied to the production of a flexible bottom film with an LED chip, and the decorative sticker is obtained by bonding the top film, which has a low production cost and overcomes many shortcomings of similar products with traditional LED lamp beads, such as messy wires, large lamp beads without load, and difficulty in automatic installation on the decorative sticker, inconvenient packaging and transportation, and easy tearing.

Description

Technical Field

[0001] The invention belongs to an ornament with a built-in LED lamp, and in particular relates to a decorative sticker with a built-in flexible circuit LED enhanced decoration and a production method thereof. Background Art

[0002] Traditional decorative stickers such as couplets and window decorations are usually just pieces of paper printed with text and / or patterns, without using LED lights to enhance the decorative effect. As people's requirements for decorative effects increase, some decorative stickers have begun to use LED lights to enhance the effect. The LED lights are generally packaged LED lamp beads connected in series through external wires and then connected to batteries. The specific structure can refer to a luminous couplet disclosed in Chinese utility model patent CN210378323U.

[0003] Existing couplets and window decorations with enhanced decoration with LED lights have the following shortcomings: packaged LED lamp beads are used instead of LED chips, so the size is larger and thicker. When combined with couplets or window decorations, the presence of the LED lamp beads can be clearly seen or felt. When the LED lights are not turned on during the day, the larger LED lights and light-transmitting holes will affect the original decorative effects of the couplets and window decorations. At the same time, the thicker and larger lamp beads also affect the posting of the couplets and window decorations; similarly, the connection with the battery through external messy wires also has the problem of reducing the decorative effect and affecting the posting and use. At the same time, the messy wires also affect the packaging and transportation, and pulling the wires during the posting process will also cause the couplets or window decorations to tear; the battery uses conventional long cylindrical batteries or round pancake-shaped button batteries. Compared with the thinner couplets and window decoration bodies, the battery installation area will have obvious protrusions, affecting the appearance; the production and assembly are relatively complicated, especially the connection of the LED lamp beads with the wires and the insertion and fixing of each LED lamp bead with the light-transmitting holes on the couplets or window decorations after the connection, which are difficult to achieve automated mass production, resulting in low production efficiency and high labor costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a decorative sticker with built-in flexible circuit LED enhanced decoration and a production method thereof, aiming to overcome the above-mentioned shortcomings of conventional couplets and window grilles with LED decoration in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a decorative sticker with built-in flexible circuit LED enhanced decoration, which includes a flexible bottom film and a top film, an LED light-emitting component is arranged on the top surface or inside of the bottom film, and the LED light-emitting component includes a flexible circuit and a battery, a switch and a plurality of LED chips electrically connected to the flexible circuit, the dimensions of a single LED chip in each direction are less than 1 mm, and the distance between adjacent LED chips is more than 10 mm, the top surface of the top film is printed with text and / or patterns and a plurality of light-transmitting holes are formed on the top film, the top film is bonded and fixed to the top surface of the bottom film and the light-transmitting holes correspond one-to-one to the LED chips.

[0006] Compared with the prior art, the decorative sticker provided by the present invention has the following beneficial effects:

[0007] The LED light-emitting component uses a flexible bottom film as a carrier, including a flexible circuit, a battery, a switch and multiple LED chips. The top film is glued and fixed on the bottom film, and each LED chip is aligned with the light-transmitting hole on the top film. The LED chip is a bare core rather than a packaged LED lamp bead, so the size of each LED chip is small in all directions, which effectively overcomes the deficiency of using larger LED lamp beads and requiring larger light-transmitting holes and lacking aesthetics. The light-transmitting hole of the decorative sticker provided by the present invention is only the size of a pinhole. When the LED chip is not lit during the day, it is basically impossible to find the light-transmitting hole without a close look, which retains the characteristics of the traditional decorative sticker (couplet or window paper-cut). Lighting the LED chip at night can effectively illuminate the surface of the decorative sticker, which is beautiful and has a significantly improved decorative effect. At the same time, it is formed on the bottom film. The flexible circuit (similar to the antenna circuit of RFID) is thin and non-inductive and is loaded on the bottom film. Each LED chip (bare core, small and thin) can be directly bonded to the flexible circuit with conductive glue through the RFID chip pasting process, so there are no messy wires. The decorative sticker as a whole is still a thin sheet, which is convenient for transportation and posting. At the same time, due to the reinforcing effect of the bottom film on the top film, the formed decorative sticker (couplet or window decoration) is stronger and more durable and not easy to tear; although the decorative sticker has multiple LED chips, because the size of a single LED chip is small and the spacing between adjacent LED chips is large, it is completely different from the densely packed LED lamp beads of the LED screen, and the cost is lower. In addition, the bottom film and top film of the above structure can be automatically mass-produced, further reducing the production cost.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the bottom film is a PET film or paper, and the thickness of the bottom film is less than 0.05 mm.

[0010] The advantage of adopting the above further improvement is that forming RFID antenna circuits on PET film or paper is a relatively mature technology, and the existing RFID production related processes and equipment can be directly used for flexible circuit forming and LED chip, battery, switch mounting. For the original RFID manufacturers, there are ready-made technologies and equipment, and the difficulty of production is small; the thickness of the bottom film is controlled below 0.05mm, which can save materials and ensure that the final decorative sticker is relatively thin.

[0011] The advantage of adopting the above further improvement is that the top film is paper, the dimensions of the light-transmitting holes in each direction are less than 1 mm, and the light-transmitting holes are distributed in the area where the text and / or pattern are located on the top film.

[0012] The advantage of adopting the above further improvement is that traditional spring festival couplets and window decorations are all made of paper, and the use of paper for the top film can retain the traditional characteristics of spring festival couplets and window decorations.

[0013] Furthermore, the flexible circuit is formed on the base film by printing with conductive ink or by aluminum etching, and the LED chip is fixed on the flexible circuit by means of a conductive adhesive patch.

[0014] The advantage of adopting the above further improvement is that the LED chip is fixed with the flexible circuit by conductive adhesive patch, which has lower requirements on the substrate than the current SMT process for mounting LED chips, and does not need to withstand high temperatures above 200°C, so paper and PET can be used as substrates.

[0015] Furthermore, the bottom film is a single-layer PET film, and the flexible circuit is an aluminum etching circuit formed on the top surface of the single-layer PET film.

[0016] The advantage of adopting the above further improvement is that, compared with the double-layer PET film, the single-layer PET film reduces the PET film layer on the top surface and also reduces the pasting process of this step, thereby reducing the production cost of the decorative sticker.

[0017] Furthermore, the bottom film is a double-layer PET film, and the flexible circuit is an aluminum etching circuit formed between the double-layer PET film.

[0018] The advantage of adopting the above further improvement is that, compared with a single-layer PET film, the double-layer PET film encapsulates the flexible circuit, battery, LED chip, etc. between two layers of film, is waterproof and moisture-proof, can reduce the failure rate and enhance durability.

[0019] Furthermore, the LED chip is in the shape of a rectangular sheet with a length of less than 0.71 mm, a width of less than 0.29 mm, and a thickness of less than 0.20 mm.

[0020] The advantage of adopting the above-mentioned further improvement is that the LED chip of the above-mentioned size is relatively small, which can ensure that the light-transmitting hole of the same size as the pinhole is of the same size. When the LED chip is not lit, the light-transmitting hole is not easily detected when observed at a certain distance, thereby preserving the integrity of the top film layer and the original characteristics of the decorative veneer layer.

[0021] Furthermore, the battery is a paper battery, the thickness of the paper battery is less than 1 mm, and the switch is an RFID switch, a Bluetooth switch or a touch switch.

[0022] The advantage of adopting the above further improvement is that the paper battery is very thin and can match the thin sheet structure of the decorative sticker, so that obvious protrusions are not easily observed, making the overall decorative sticker equivalent to the traditional thin sheet structure, ensuring that the battery installation does not affect the overall decorative effect of the decorative sticker.

[0023] Furthermore, several areas on the bottom surface of the bottom film are coated with glue and adhered with release paper.

[0024] The advantage of adopting the above further improvement is that the decorative sticker can be pasted after tearing off the release paper, which is convenient for use of the decorative sticker.

[0025] The present invention also provides a method for producing the above-mentioned decorative sticker with built-in flexible circuit LED enhanced decoration, which comprises the following steps:

[0026] S1. Preparation of bottom film: A flexible circuit is formed on the bottom film by using conductive ink printing or aluminum etching. A mounting position for each LED chip, battery and switch is reserved at a designated position on the flexible circuit. Each LED chip is fixed at the corresponding mounting position with conductive glue by using RFID chip patch installation process. At the same time, the battery and switch are also connected to the flexible circuit with conductive glue. If the bottom film is a single-layer film, the preparation is completed. If the bottom film is a double-layer film, a layer of film needs to be glued and fixed on the top surface to complete the preparation;

[0027] S2. Preparation of the top film: Printing patterns and / or text on the top film, and then punching holes at designated locations to form light-transmitting holes;

[0028] S3. Gluing and molding: Apply glue on the upper surface of the prepared bottom film, and then align and cover the prepared top film on the bottom film and apply pressure to glue and mold.

[0029] Compared with the prior art, the advantages of the above production method provided by the present invention are:

[0030] The above method provided by the present invention uses RFID antenna preparation technology to prepare a flexible circuit on a PET or paper base film and adopts the conductive glue dispensing process of RFID chip packaging to connect the LED chip to the flexible circuit. The LED chip on the formed bottom film is tiny and sparse, which is completely different from the LED screen. During its production, RFID antenna circuit preparation technology, chip mounting technology and RFID production-related equipment can be utilized, and RFID production technology is applied to the production of flexible films with LED chips, thereby realizing mass production of flexible bottom film sheets with LED chips, flexible circuits, batteries, switches, etc. The bottom film preparation, top film preparation and gluing molding steps are all easy to realize automated mass production. Compared with the handmade decorative stickers such as couplets and window grilles decorated with LED lamp beads in the prior art, its production cost is lower and the overall decorative effect is better, and it has great potential market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An exploded view of a decorative sticker with a built-in flexible circuit LED enhanced decoration provided by the present invention (the LED chip and light-transmitting hole in the figure are only for illustration, and the actual dimensions in each direction do not exceed 1 mm);

[0032] Figure 2 for Figure 1 A cross-sectional view of a decorative sticker having a built-in flexible circuit LED enhanced decoration is shown;

[0033] Figure 3 The present invention is a flow chart of a method for producing a decorative sticker with built-in flexible circuit LED enhanced decoration.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Bottom film; 2. Top film; 3. Flexible circuit; 4. Battery; 5. Switch; 6. LED chip; 7. Light-transmitting hole; 8. PET film; 9. Aluminum etching circuit. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] In the description of the present invention, if terms indicating orientation such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] like Figure 1and 2 As shown, the present invention provides a decorative sticker with built-in flexible circuit LED enhanced decoration, which includes a flexible bottom film 1 and a top film 2, the top surface or interior of the bottom film 1 is provided with an LED light-emitting component, the LED light-emitting component includes a flexible circuit 3 and a battery 4, a switch 5 and a plurality of LED chips 6 connected in series to the flexible circuit 3 (the series connection of each component is conducive to simplifying the circuit structure, reducing the number of switches and facilitating opening and closing. If it is to achieve asynchronous lighting of each LED chip or independent start and stop of each other, it is also possible to consider using a parallel or series-parallel composite form), the dimensions of each direction of a single LED chip 6 are less than 1 mm, and the distance between adjacent LED chips 6 is more than 10 mm, the top surface of the top film 2 is printed with text and / or patterns, and a plurality of light-transmitting holes 7 are formed on the top film 2, the top film 2 is bonded and fixed to the top surface of the bottom film 1, and the light-transmitting holes 7 correspond to the LED chips 6 one by one.

[0039] It should be noted that the above-mentioned bottom film is different from the traditional LED screen. The LED screen generally has dense LED lamp beads and is relatively thick. The thickness of the ultra-thin flexible LED screen that has been reported to be put into use is about 3mm. The cost of the ultra-thin flexible LED screen with a thickness of 3mm is already very high, so it is almost impossible to apply it to relatively cheap decorative stickers (couplets, window flowers, etc.) to enhance the decorative effect. Moreover, the thickness of about 3mm will also affect the use of decorative stickers. Therefore, the present invention uses the technology of preparing RFID tags to install tiny LED chips on the flexible circuit formed on the label paper (PET film or paper) to form a film material with a light-emitting function (non-display screen function), and its thickness is equivalent to that of the RFID tag. The overall thickness can be less than 0.2mm. The film material (bottom film) is compounded with the top film printed with graphics to obtain a decorative sticker that is still in the form of a thin sheet as a whole. It not only retains the form of the traditional decorative sticker (flexible thin sheet), but also has the lighting from the light-transmitting hole after the LED is lit to enhance the decorative effect. The LED lamp emits warm light, which is different from the cold-toned fluorescence, and has a better decorative effect.

[0040] In addition, the thickness of the traditional LED screen is not only difficult to meet the requirements of the bottom film of the present invention, but also it is generally produced with a high temperature resistant PI film as the substrate, and the LED chip or lamp bead is fixed on the copper circuit on the surface of the PI film substrate by solder paste. The cost of PI film, solder paste and copper circuit are higher than the PET film or paper substrate, conductive glue and aluminum circuit used in the present invention, and the temperature required for the production process is also higher. The existing LED screens basically do not use PET film as the substrate and use aluminum as the etching circuit. There are many reasons for this. One important point is that when making LED screens (especially thinner flexible screens), LED chips are generally mounted using SMT technology. The solder paste used needs to be melted for a period of time at a high temperature of more than 200°C. PI film can withstand it, but PET film cannot. If low-temperature solder paste is used, the cost will increase significantly. At the same time, the oxide layer on the surface of the aluminum circuit makes it difficult for the solder paste to be effectively combined with it. This also reflects from the side that the present invention uses the technology of making RFID tags to produce flexible bottom film containing LED chips, aluminum flexible circuits, etc. and finally obtains the technical advantage of decorative stickers.

[0041] In one embodiment of the present invention, the bottom film 1 is a PET film 8 or paper, and the thickness of the bottom film 1 is less than 0.05 mm. The top film 2 is paper, and the dimensions of the light-transmitting holes 7 in each direction are less than 1 mm, and the light-transmitting holes 7 are distributed in the area where the text and / or pattern are located on the top film 2.

[0042] It is understandable that the bottom film and the top film can both be made of paper as the substrate, the former forms a flexible circuit on the paper substrate and installs each LED, battery, switch, etc., and the latter prints on the paper substrate to form a graphic with a decorative effect (such as couplet text and surrounding patterns). In addition, the bottom film and the top film can also be both PET films or at least one of them can be PET film. In actual production, it can be flexibly applied as needed.

[0043] In one embodiment of the present invention, the flexible circuit 3 is formed on the bottom film 1 by conductive ink printing or aluminum etching, and the LED chip 6 is fixed on the flexible circuit 3 by conductive adhesive patch. The flexible circuit is preferably formed by aluminum etching, and the formed flexible circuit is used to connect each LED chip, battery and switch in series, and the switch can control each LED lamp to be turned on or off with the battery.

[0044] On the basis of the above embodiment, the bottom film 1 can be a single-layer PET film 8, and the flexible circuit 3 is an aluminum etching circuit 9 formed on the top surface of the single-layer PET film 8. At this time, when the bottom film is prepared, the flexible circuit and each LED chip are exposed on the surface. When forming the decorative sticker, glue is applied at the appropriate position of the exposed surface and the top film layer is adhered and fixed, which has the advantage of reducing a layer of PET film and reducing costs.

[0045] On the basis of the above embodiment, the bottom film sheet 1 in this embodiment can be a double-layer PET film 8, and the flexible circuit 3 is an aluminum etching circuit 9 formed between the double-layer PET film. At this time, after the LED light-emitting component is formed on a layer of PET film, it is necessary to apply glue first and then adhere a layer of PET film. The flexible circuit, LED chip, battery and switch are not exposed, which is equivalent to encapsulating them with two layers of PET film. The advantage is that it is not easy to be damaged and has a certain waterproof ability.

[0046] In a preferred embodiment of the present invention, the LED chip 6 is in the shape of a rectangular sheet, with a length of less than 0.71 mm, a width of less than 0.29 mm, and a thickness of less than 0.20 mm. In this embodiment, the LED chip used in the present invention is a bare core, not packaged, with a length, width, and thickness of 0.71 mm × 0.286 mm × 0.15 mm, and the corresponding light-transmitting hole size is also quite large. It can be seen that the size of the light-transmitting hole is very small, no different from a pinhole. When some such light-transmitting holes are opened on the top film, it is almost impossible to detect without careful close inspection. Figure 1 and Figure 2 The larger LED chip and light-transmitting hole shown in the figure are for illustration only. In the actual product, the light-transmitting hole will not cause any adverse effect of unevenness or discontinuity on the printed graphics and text.

[0047] It should be noted that in actual production, the LED chips and light-transmitting holes can be distributed and designed according to the graphics and text on the top membrane. Taking couplets as an example, each couplet has its own characteristics in the positions of the light-transmitting holes due to different texts, and the corresponding flexible circuits and the positions of the LED chips also have corresponding characteristics. At this time, it is equivalent to designing a corresponding circuit template and LED chip installation sequence for each couplet. The finished decorative sticker has the best decorative effect because the distribution of LED chips and light-transmitting holes is arranged according to the corresponding arrangement of each text, but obviously its cost is also higher.

[0048] Another solution that can be adopted in actual production is that the positions of LED chips and light-transmitting holes on the bottom and top diaphragms are standardized. The patterns and texts on the top diaphragm are ignored when opening them, and punching, flexible circuit forming and LED chip installation are directly carried out according to standard design. The punching positions are only determined by the size of the decorative stickers of the couplets or window paper-cuts and have nothing to do with the patterns and texts. Only one set of templates and chip installation control programs are needed to mass-produce couplets with different patterns and texts, which can significantly improve production efficiency and reduce costs. At the same time, it can still serve the purpose of illuminating the surface of the couplets and has a better decorative effect. However, the positions of the light-transmitting holes do not take into account the characteristics of each font or pattern, so the decorative effect is slightly worse than that of the previous solution.

[0049] In actual production, the above two solutions can be selected according to needs, and both should be included in the protection scope of the present invention.

[0050] In one embodiment of the present invention, the battery 4 is a paper battery, the thickness of which is less than 1 mm, and the switch 5 is an RFID switch, a Bluetooth switch or a touch switch. The thickness of the paper battery can be made thinner at present, and the battery capacity is also larger, which can meet the requirements of a couplet, window decoration, etc., which has dozens or more LED chips, but is significantly less than the LED screen, for a longer lighting time.

[0051] In one embodiment of the present invention, several areas on the bottom surface of the bottom film sheet 1 are coated with glue and adhered with release paper.

[0052] like Figure 3 As shown, the present invention also provides a method for producing the above-mentioned decorative sticker with built-in flexible circuit LED enhanced decoration, which comprises the following steps:

[0053] S1. Preparation of bottom film: A flexible circuit 3 is formed on the bottom film 1 by using a conductive ink printing method or an aluminum etching method. A mounting position for each LED chip 6, a battery 4 and a switch 5 is reserved at a designated position on the flexible circuit 3. Each LED chip 6 is fixed at a corresponding mounting position with a conductive adhesive by using an RFID chip patch mounting process. At the same time, the battery 4 and the switch 5 are also connected to the flexible circuit 3 with a conductive adhesive. If the bottom film 1 is a single-layer film, the preparation is completed. If the bottom film 1 is a double-layer film, a layer of film needs to be glued and fixed on the top surface to complete the preparation;

[0054] S2. Preparation of the top film: Printing patterns and / or text on the top film 2, and then punching holes 7 at designated locations to form each light-transmitting hole;

[0055] S3. Gluing and molding: Apply glue on the upper surface of the prepared bottom film 1, and then align and cover the prepared top film 2 on the bottom film 1 and apply pressure to glue and mold.

[0056] It should be noted that the decorative stickers mentioned in the present invention include but are not limited to couplets and window decorations, and also include similar sheet-like products.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A couplet with built-in flexible circuit LED enhanced decoration, characterized in that: The invention comprises a flexible bottom film (1) and a top film (2), wherein an LED light-emitting component is arranged on the top surface or inside of the bottom film (1), wherein the LED light-emitting component comprises a flexible circuit (3), a battery (4) electrically connected to the flexible circuit (3), a switch (5) and a plurality of LED chips (6), wherein the dimensions of a single LED chip (6) in each direction are less than 1 mm, and the distance between adjacent LED chips (6) is more than 10 mm, wherein text and / or patterns are printed on the top surface of the top film (2) and a plurality of light-transmitting holes (7) are formed on the top film (2), wherein the top film (2) is bonded and fixed to the top surface of the bottom film (1) and the light-transmitting holes (7) correspond one to one with the LED chips (6), wherein the LED chips (6) are rectangular thin sheets, wherein the length is less than 0.71 mm, the width is less than 0.29 mm and the thickness is less than 0.2 mm, and the LED chips (6) are bare cores and are not packaged; The top film (2) is paper, the dimensions of the light-transmitting holes (7) in each direction are less than 1 mm, and the light-transmitting holes (7) are distributed in the area where the text and / or pattern are located on the top film (2); The bottom film (1) is a single-layer PET film (8), and the flexible circuit (3) is an aluminum etching circuit (9) formed on the top surface of the single-layer PET film (8).

2. A couplet with built-in flexible circuit LED enhanced decoration according to claim 1, characterized in that: The bottom film sheet (1) is a PET film (8) or paper, and the thickness of the bottom film sheet (1) is less than 0.05 mm.

3. The couplet with built-in flexible circuit LED enhanced decoration according to claim 1, characterized in that: The LED chip (6) is fixed on the flexible circuit (3) by means of a conductive adhesive patch.

4. The couplet with built-in flexible circuit LED enhanced decoration according to claim 1, characterized in that: The flexible circuit (3) is formed on the base film (1) by printing with conductive ink or by aluminum etching.

5. A couplet with built-in flexible circuit LED enhanced decoration according to any one of claims 1 to 4, characterized in that: The battery (4) is a paper battery, the thickness of which is less than 1 mm, and the switch (5) is an RFID switch, a Bluetooth switch or a touch switch.

6. The couplet with built-in flexible circuit LED enhanced decoration according to claim 5, characterized in that: Several areas on the bottom surface of the bottom film sheet (1) are coated with glue and adhered with release paper.

7. A method for producing a couplet with built-in flexible circuit LED enhanced decoration as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1. Preparation of the bottom film: A flexible circuit (3) is formed on the bottom film (1) by using a conductive ink printing method or an aluminum etching method. A mounting position for each LED chip (6), a battery (4) and a switch (5) is reserved at a designated position on the flexible circuit (3). Each LED chip (6) is fixed at a corresponding mounting position with a conductive adhesive using an RFID chip patch mounting process. At the same time, the battery (4) and the switch (5) are also connected to the flexible circuit (3) with a conductive adhesive to complete the preparation; S2. Preparation of the top film: printing a pattern and / or text on the top film (2), and then punching holes (7) at designated positions to form light-transmitting holes; S3. Gluing and molding: Apply glue on the upper surface of the prepared bottom film (1), and then align and cover the prepared top film (2) on the bottom film (1) and apply pressure to glue and mold.

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