LED light-emitting card based on NFC near field induction and production process
By integrating conductive ink antennas and micro LED lamp beads on the cards, and adopting distributed circuit layout and hot pressing technology, the problems of large thickness and uneven brightness of traditional cards are solved, and the NFC power supply effect with thin, high brightness and low cost are achieved.
Patent Information
- Application Number
- CN202510338227.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-07-04
AI Technical Summary
Traditional luminous cards rely on EL cold light sheets or built-in batteries, which have problems such as large thickness, short battery life and complex process. Although the existing NFC power supply solution reduces the thickness, the antenna and LED integration is low, and the energy utilization rate is insufficient, resulting in uneven luminous brightness.
The conductive ink antenna is integrated with the micro LED lamp beads on the flexible substrate, and the seamless combination of each layer is achieved through distributed circuit layout and thermal pressing process, combined with NFC power supply, and the battery design is eliminated.
The total card thickness is ≤0.65mm, the energy capture efficiency is improved by 30%, the LED brightness is increased to 200cd/m², the production steps are reduced by 50%, and the yield rate is ≥99%. It is suitable for high-precision game cards and dynamic interactive scenarios.
Smart Images
Figure CN120258029A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cultural and entertainment product manufacturing, and specifically to an NFC near-field induction-based LED luminous card and its production process. Background Art
[0002] Cards are devices commonly set in modern public spaces. For example, card stands are set in shopping malls and commercial buildings to guide customers to stroll through the mall and understand which merchants are located on each floor.
[0003] Traditional luminous cards rely on EL cold light sheets or built-in batteries, and have problems such as large thickness (≥1.2 mm), short battery life, and complex processes. Although the existing NFC power supply solutions reduce the thickness, the integration of the antenna and the LED is low, and the energy utilization rate is insufficient, resulting in uneven luminous brightness. Summary of the Invention
[0004] The purpose of the present invention is to provide an NFC near-field induction-based LED luminous card and its production process to solve the problems in the above background art that traditional luminous cards rely on EL cold light sheets or built-in batteries, have large thickness, short battery life, and complex processes, and although the existing NFC power supply solutions reduce the thickness, the integration of the antenna and the LED is low, and the energy utilization rate is insufficient, resulting in uneven luminous brightness.
[0005] To achieve the above purpose, the present invention provides the following technical solutions: An NFC near-field induction-based LED luminous card and its production process, including a base material, on the upper end surface of which a conductive ink antenna is inlaid, an NFC chip is fixed on the upper end surface of the base material, high-transparency PET protective layers are fixed on both the upper end surface and the lower end surface of the base material, a front ink layer is fixed on the outer end surface of one of the high-transparency PET protective layers, and a back covering ink layer is fixed on the outer end surface of the other high-transparency PET protective layer.
[0006] Preferably, the base material is made of polyimide film with a thickness of 0.4 mm.
[0007] Preferably, the conductive ink antenna is a nano-silver conductive ink-printed spiral NFC antenna with a thickness of 0.02 mm.
[0008] Preferably, micro LED lamp beads are arranged in a matrix on the nodes of the conductive ink antenna, and the size of the micro LED lamp beads is 0.5 mm × 0.5 mm × 0.2 mm.
[0009] Preferably, the thickness of the high-transparency PET protective layer is 0.12 mm, and the thicknesses of both the front ink layer and the back covering ink layer are 0.05 mm.
[0010] An NFC near-field induction-based LED luminous card production process includes the following steps: S1, Conductive ink printing: The conductive ink antenna pattern and the LED pads are synchronously printed on the substrate through inkjet printing technology, with a positioning accuracy of ±0.03 mm; S2, Chip and LED bonding: The NFC chip and the micro-LED are precisely embedded in the pads using a vacuum adsorption device and fixed by reflow soldering; S3, Gradient hot pressing: Pressurize in stages. The first stage: Cure the ink at 80 °C / 5 MPa; The second stage: Fuse the PET layer at 110 °C / 8 MPa, and compress the total thickness to ≤0.65 mm; S4, Optical inspection: Use a CCD camera to detect the luminous uniformity and automatically mark the defective products with a brightness deviation > 10%.
[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. The LED light-emitting card based on NFC near-field induction has a total thickness ≤0.65 mm, a bending radius of up to 50 mm, is suitable for bending scenarios, the spiral antenna design improves the energy capture efficiency by 30%, the LED brightness is increased to 200 cd / m², the conductive ink printing replaces the traditional bonding, the production steps are reduced by 50%, and the yield rate ≥99%.
[0012] 2. The LED light-emitting card based on NFC near-field induction integrates the NFC antenna and the LED lamp beads in the flexible conductive ink layer by optimizing the layered structure of the card, and adopts a distributed circuit layout to enhance the energy capture efficiency. The seamless combination of each layer is achieved through the hot pressing process, significantly improving the energy transmission efficiency and luminous uniformity. This design does not require a battery and is powered by an NFC device, suitable for high-precision game cards and dynamic interaction scenarios. Description of the Drawings
[0013] Figure 1 It is a front view sectional structure schematic diagram of the present invention; Figure 2 It is a top view sectional structure schematic diagram of the present invention; Figure 3 It is a production process flow chart of the present invention.
[0014] In the figure: 1, Substrate; 2, Conductive ink antenna; 3, NFC chip; 4, High-transparency PET protective layer; 5, Front ink layer; 6, Back covering ink layer. Detailed Embodiments
[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0016] Please refer to Figures 1 - 3 , the present invention provides a technical solution: an LED light-emitting card based on NFC near-field induction, including a base material 1, a conductive ink antenna 2 is inlaid on the upper end surface of the base material 1, an NFC chip 3 is fixed on the upper end surface of the base material 1, and high-transparency PET protective layers 4 are fixed on both the upper end surface and the lower end surface of the base material 1. A front ink layer 5 is fixed on the outer end surface of one of the high-transparency PET protective layers 4, and a back covering ink layer 6 is fixed on the outer end surface of the other high-transparency PET protective layer 4.
[0017] In this embodiment, as Figure 1 and Figure 2 shown, the base material 1 is made of a polyimide film with a thickness of 0.4 mm, which has both flexibility and high temperature resistance and is suitable for the hot pressing process.
[0018] In this embodiment, as Figure 1 and Figure 2 shown, the conductive ink antenna 2 is printed with a spiral NFC antenna using nano-silver conductive ink, with a thickness of 0.02 mm, replacing the traditional copper foil antenna and reducing the lamination process.
[0019] In this embodiment, as Figure 1 and Figure 2 shown, micro-LED lamp beads are arranged in a matrix on the nodes of the conductive ink antenna 2, and the size of the micro-LED lamp beads is 0.5 mm × 0.5 mm × 0.2 mm. The impedance is reduced through a parallel circuit to improve the light emission uniformity.
[0020] In this embodiment, as Figure 1 and Figure 3 shown, the thickness of the high-transparency PET protective layer 4 is 0.12 mm, the thicknesses of the front ink layer 5 and the back covering ink layer 6 are both 0.05 mm, and the light transmittance of the back covering ink layer 6 ≤ 0.5%. The high-transparency PET protective layer 4 has good light transmittance, and the front ink layer 5 and the back covering ink layer 6 have good scratch resistance.
[0021] According to another aspect of the present invention, a production process for an LED light-emitting card based on NFC near-field induction is provided, including the following steps: S1. Conductive ink printing: The pattern of the conductive ink antenna 2 and the LED pads are synchronously printed on the base material 1 through inkjet printing technology, and the positioning accuracy is ±0.03 mm; S2. Chip bonding with LED: Use a vacuum adsorption device to accurately embed the NFC chip 3 and the micro LED into the pads, and fix them by reflow soldering; S3. Gradient hot pressing: Press in stages. The first stage: Cure the ink at 80°C / 5MPa; The second stage: Fuse the PET layer at 110°C / 8MPa, and compress the total thickness to ≤0.65mm; S4. Optical inspection: Use a CCD camera to detect the light emission uniformity, and automatically mark the defective products with a brightness deviation > 10%.
[0022] Take the production of a flexible game card with a size of 63mm × 88mm as an example: 1. Substrate treatment: Print a spiral antenna and LED pads on the PI substrate, and use ultraviolet curing ink to ensure accuracy.
[0023] 2. Component encapsulation: Use a chip mounter to embed the NFC chip model: NTAG216 and the 0402 - sized LED into the pads, and the reflow soldering temperature is 260°C.
[0024] 3. Gradient pressing: Preheat at 80°C in the first stage to cure the ink, and press at 110°C in the second stage to fuse the PET layer. Keep a vacuum environment throughout the process to avoid bubbles.
[0025] 4. Function test: Activate the card with an NFC reader at a frequency of 13.56MHz, and detect that the LED lighting time ≤ 0.3 seconds and the brightness fluctuation < 5%.
[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An LED lighting card based on NFC near-field induction, comprising a base material (1), characterized in that: The upper end surface of the substrate (1) is inlaid with a conductive ink antenna (2), the upper end surface of the substrate (1) is fixed with an NFC chip (3), and high-transparency PET protective layers (4) are fixed on both the upper end surface and the lower end surface of the substrate (1). A front ink layer (5) is fixed on the outer end surface of one of the high-transparency PET protective layers (4), and a back covering ink layer (6) is fixed on the outer end surface of the other high-transparency PET protective layer (4).
2. The LED light-emitting card based on NFC near-field induction according to claim 1, wherein: The substrate (1) is made of a polyimide film with a thickness of 0.4 mm.
3. The LED light-emitting card based on NFC near-field induction according to claim 1, characterized in that: The conductive ink antenna (2) is printed with a spiral NFC antenna using nano-silver conductive ink, with a thickness of 0.02 mm.
4. A kind of LED lighting card based on NFC near-field induction according to claim 1, characterized in that: Micro LED beads are arranged in a matrix on the nodes of the conductive ink antenna (2), and the size of the micro LED beads is 0.5 mm × 0.5 mm × 0.2 mm.
5. A kind of LED light-emitting card based on NFC near-field induction according to claim 1, characterized in that: The thickness of the high-transparency PET protective layer (4) is 0.12 mm, and the thicknesses of both the front ink layer (5) and the back covering ink layer (6) are 0.05 mm.
6. A production process of an LED lighting card based on NFC near-field induction, which is applied to an LED lighting card based on NFC near-field induction described in any one of claims 1-5, and is characterized in that, It includes the following steps: S1. Conductive ink printing: The pattern of the conductive ink antenna (2) and the LED pads are synchronously printed on the substrate (1) through inkjet printing technology, with a positioning accuracy of ±0.03 mm; S2. Chip and LED bonding: The NFC chip (3) and the micro LED are precisely embedded in the pads using a vacuum adsorption device and fixed by reflow soldering; S3. Gradient hot pressing: Pressurize in stages. The first stage: Cure the ink at 80°C / 5 MPa; The second stage: Fuse the PET layer at 110°C / 8 MPa, and compress the total thickness to ≤0.65 mm; S4. Optical detection: Use a CCD camera to detect the light emission uniformity and automatically mark the defective products with a brightness deviation > 10%.