Wirelessly-driven LED film light-emitting display device

Abstract

The invention relates to a wirelessly-driven LED (light-emitting diode) film light-emitting display device, which sequentially comprises a transparent protective layer 1, a transparent conductive film layer 2, an LED chip layer 3, a back electrode layer 4, an isolating layer 5, a film coil layer 6 and a back protective layer 7, the LED light source is characterized in that the LED chip layer is formed by arranging a plurality of LED chip particles in a silk screen film, and the LED chip layer is tightly clamped between the transparent conductive film layer and the back electrode layer; an isolating layer is loaded behind the back electrode layer, a thin film coil layer is printed on the rear surface of the isolating layer, and the isolating layer is prepared from insulating ink; an electrode lead formed by printing the transparent conductive film layer and the back electrode layer is connected with the film coil layer; the thin film coil layer receives electromagnetic induction to generate alternating current 1-12V voltage, and the LED can be wirelessly driven to form the flexible thin film light-emitting display device with dynamic patterns.

Description

Technical Field

[0001] This invention belongs to the field of LED light-emitting display application technology. Background Technology

[0002] Existing LED light-emitting devices all require connecting positive and negative electrode leads to LED chips and encapsulating them into lamp beads, and then connecting them to DC power supplies and circuits to produce light. Matrix displays, on the other hand, require dedicated control circuits. Even AC electroluminescence requires circuits to regulate the voltage. They require dedicated circuits, power supplies, and connecting wires, making it impossible to form a thin, flexible, power-free light-emitting film.

[0003] This invention discloses a wirelessly driven LED thin-film light-emitting display device, which designs a wireless driving structure and fabrication method to achieve circuitless flexible LED light-emitting display. It sequentially comprises: a transparent protective layer, a transparent conductive thin film layer, an LED chip layer, a back electrode layer, an isolation layer, a thin-film coil layer, and a back protective layer. The key feature is that the LED chip layer is formed by arranging multiple LED chip particles tightly sandwiched between the transparent conductive thin film layer and the back electrode layer. An isolation layer is loaded behind the back electrode layer, and a thin-film coil is printed on the rear surface of the isolation layer. Electrode leads printed on the transparent conductive thin film layer and the back electrode layer are connected to the thin-film coil layer. The thin-film coil layer receives electromagnetic induction to generate AC voltage and current, which can directly wirelessly drive the LED to form a flexible thin-film light-emitting display device with dynamic patterns. This invention does not require any driving device; the LED can still emit light at a distance of 1 cm from the electromagnetic wireless power source.

[0004] This invention can be widely used for electromagnetic field measurement and light emission indication, wireless charging lighting and display, electronic tags and anti-counterfeiting, nighttime safety clothing warnings, mobile phones, induction cookers, wireless power transmission, high-voltage power warnings, etc. It can directly generate LED light emission and be used in light emission, display and lighting in home appliances, automobiles, power, airplanes, ships, underwater light emission, chip manufacturing, mobile communications, paper light emission and other fields. Summary of the Invention

[0005] A wirelessly driven LED thin-film light-emitting display device comprises, in sequence: a transparent protective layer 1, a transparent conductive thin film layer 2, an LED chip layer 3, a back electrode layer 4, an isolation layer 5, a thin-film coil layer 6, and a back protective layer 7; characterized in that: the LED chip layer is formed by arranging multiple LED chip particles in a screen film, and the LED chip layer is tightly sandwiched between the transparent conductive thin film layer and the back electrode layer; an isolation layer is loaded behind the back electrode layer, and a thin-film coil layer is printed on the rear surface of the isolation layer; the isolation layer is made of insulating ink; electrode leads printed on the transparent conductive thin film layer and the back electrode layer are connected to the thin-film coil layer; the thin-film coil layer receives electromagnetic induction to generate an AC 1-12V voltage, which wirelessly drives the LEDs to form dynamic patterns, thus creating a flexible thin-film light-emitting display device.

[0006] The transparent protective layer 1 and the back protective layer 7 in this invention are made of PET, PI, TPU, PVC, or fluoroplastic film. They have a smooth surface, a thickness of 0.05 mm to 0.5 mm, are insulating and waterproof, and are sealed using adhesive or thermoforming. Colored patterns can be printed or applied to the surface of the transparent protective layer to create dynamic color light emission.

[0007] The transparent conductive film layer 2 in this invention provides a transparent electrode for the LED. The transparent electrode material is one of ITO, conductive polymer, and silver nanowires, or it can be a transparent conductive material such as graphene or carbon nanotubes. The transparent conductive film layer is formed on the surface of the transparent protective layer by printing, coating, or vacuum sputtering, and is in close contact with the perpendicular electrode point of the LED light-emitting surface. The pattern of the transparent conductive film layer can be formed by laser ablation, or by plate printing or inkjet printing of color patterns.

[0008] The LED chip layer 3 in this invention is composed of vertically structured LED chip particles with a size of 20-300 micrometers. LED electrodes are located at the top and bottom ends of the chip. The LEDs do not require bonding electrode leads or connection wires; this invention directly uses the LED chips. The LED chip layer is prepared as follows: First, a 10-300 micrometer thick screen film is prepared from one of the following materials: polyester, polyurethane, nylon, or polyethylene, using electrospinning technology. Then, the LED chips are arranged in a regular pattern and inserted into the mesh of the screen film for fixation. The screen film carrying the LED chips is then applied to a transparent conductive layer, and UV insulating ink is dripped onto it to fix the screen film. Finally, a film coil layer or back electrode layer is covered and pasted. This preparation method prevents the columnar LED chips from tipping over, and also prevents the two flexible film electrodes from intersecting and short-circuiting. Vertically structured LED chips can be used individually or in multiples, arranged in a matrix or pattern. The light-emitting surface of the LED chip particles is bonded to the transparent conductive film layer. Alternatively, insulating ink can be directly filled between the LED chip particles. Red, blue, and green LED chips can be used, or only blue LED chips can be used, combined to create colored light emission.

[0009] The back electrode layer 4 in this invention is one of ITO, conductive polymer, silver nanowires, silver paste, copper paste, and carbon paste. The back electrode layer is formed on the back surface of the LED chip layer by printing, coating, and vacuum sputtering, and is tightly bonded to the lower electrode point of the LED chip. The pattern of the back electrode layer is formed using a printer. The back electrode layer uses a transparent conductive material to form double-sided transparent light emission. The back electrode layer 4 is then covered with an insulating layer 5, which is printed multiple times using insulating ink. The insulating layer 5 has silver paste interface holes between the transparent electrode layer and the back electrode layer, and is printed and connected to the thin-film coil layer 6.

[0010] The thin-film coil layer 6 in this invention is prepared on the insulating layer 5.Figure 3 The thin-film coil layer 6 uses highly conductive silver or copper paste to print, etch, and form lines. The thin-film coil has an inner electrode 10 and an outer electrode 8. The thin-film coil can receive radio electromagnetic signals and generate 1-12V AC power, such as wireless charging of mobile phones, electromagnetic radiation from induction cookers, and wireless charging of cars. The pattern of the thin-film coil layer with lines is circular or square. The shape and size are proportional to the number and brightness of LEDs. The width of the conductive lines of the thin-film coil is 0.5-2 mm, and the spacing 9 of the conductive lines is 0.5-2 mm. The density and area of ​​the thin-film coil are proportional to the LED power.

[0011] The transparent protective layer 1 and the back protective layer 7 in this invention are formed by printing with insulating ink. The insulating ink is one of polyurethane, acrylic, epoxy resin and fluorine coating. A protective film is formed by coating, printing and spraying. Various patterns and colors corresponding to the light-emitting areas are printed on the surface of the transparent protective layer and the back protective layer.

[0012] In this invention, the back protective layer 7 is formed on the surface of PET, PI, TPU, or PVC plastic film through printing, coating, or vacuum sputtering. An LED chip layer is then bonded to it, and a back electrode layer is prepared on the back side of the LED chip layer. The back electrode layer uses a transparent conductive layer to achieve double-sided light emission. The thin-film coil layer 6 in this invention can use a multi-layer structure, with each layer isolated by insulating ink. Different layers of thin-film coils are connected to different LEDs, forming controllable, multi-area, large-area light-emitting patterns and images.

[0013] This invention discloses a wirelessly driven LED thin-film light-emitting display device, which sequentially comprises: a transparent protective layer 1, a transparent conductive thin film layer 2, an LED chip layer 3, a thin-film coil layer 6, and a back protective layer 7. Its key feature is that the LED chip layer is formed by arranging multiple vertically structured LED chip particles in a screen film, with ultraviolet-cured insulating ink filling the spaces between the LED chip particles; the LED chip layer is tightly sandwiched between the transparent conductive thin film layer and the thin-film coil layer; the electrode leads of the transparent conductive thin film layer are connected to the thin-film coil layer; the thin-film coil layer 6 is prepared using a transparent conductive thin film or silver paste, and is laser-etched into a thin-film coil (…). Figure 2 The thin-film coil layer receives electromagnetic induction to generate an AC voltage of 1-12V, wirelessly driving the LED to form a flexible, flashing, transparent film that emits light from both sides. The wirelessly driven LED thin-film light-emitting display device of this invention can still emit light at a distance of 1 cm from the electromagnetic source. The structure and fabrication method of this invention are only suitable for low-voltage AC electroluminescent devices.

[0014] The LED chip layer of this invention can use a single LED chip, so that a small area of ​​thin film coil layer can drive the blue or ultraviolet LED chip to emit light. The small area of ​​thin film coil layer can be fabricated on the side of the single LED chip, thus establishing a single-particle radio magnetic field induced light emission micro-nano device with a size of 10-300 micrometers or smaller on the surface of the LED chip. This single-particle radio magnetic field induced light emission micro-nano device based on this principle can be used in fields such as biomedicine, optoelectronic chips, microelectronic switches, data transmission and memory. Attached Figure Description

[0015] Figure 1 Cross-sectional structure diagram of a wirelessly driven LED thin-film light-emitting display device. Figure 2 One of the structural diagrams of a thin-film coil layer. Figure 3 The second diagram of the thin-film coil layer structure. The structure shown in the figure is as follows: 1. Transparent protective layer, 2. Transparent conductive thin film layer, 3. LED chip layer, 4. Back electrode layer, 5. Isolation layer, 6. Thin film coil layer, 7. Back protective layer, 8. Outer electrode of thin film coil layer, 9. Line spacing, 10. Inner electrode of thin film coil layer. Detailed Implementation

[0016] A wirelessly driven LED thin-film light-emitting display device, comprising ( ) Figure 1 The structure comprises: 1. Transparent protective layer; 2. Transparent conductive thin film layer; 3. LED chip layer; 4. Back electrode layer; 5. Isolation layer; 6. Thin film coil layer; 7. Back protective layer. Its characteristic is that the LED chip layer is formed by arranging multiple LED chip particles in a screen film, although a single LED chip can also be used. The LED chip layer is tightly sandwiched between the transparent conductive thin film layer and the back electrode layer. Vertically structured LED chip particles typically have electrode contact points at the top and bottom. An isolation layer is loaded behind the back electrode layer, and a thin film coil layer is printed on the surface behind the isolation layer. The isolation layer is made using insulating ink. Electrode leads printed on the transparent conductive thin film layer and the back electrode layer are connected to the thin film coil layer. Figure 1 The thin-film coil layer receives electromagnetic induction to generate an AC 1-12V voltage, which directly and wirelessly drives the LEDs to form a flexible thin-film light-emitting display device with dynamic patterns.

[0017] The transparent protective layer 1 and the back protective layer 7 in this invention are made of PET, PI, TPU, PVC, or fluoroplastic film, or they can be formed by ink printing. They have a smooth surface, a thickness of 0.05 mm to 0.5 mm, are insulating and waterproof, and are sealed using adhesive or thermoforming. The outer surface of the transparent protective layer can be printed or covered with colored patterns to create dynamic color light emission.

[0018] The transparent conductive thin film layer 2 in this invention provides transparent electrodes for the LED chip particles. The LED chip particles in this invention do not require electrode leads or encapsulation into lamp beads. The transparent electrode material is one of ITO, conductive polymers, or silver nanowires, and can also be transparent conductive materials such as graphene or carbon nanotubes. The transparent conductive thin film layer is formed on the surface of the transparent protective layer through printing, coating, or vacuum sputtering, and is in close contact with the perpendicular electrode points of the LED light-emitting surface. The pattern of the transparent conductive thin film layer can be formed by laser ablation, or by plate printing or inkjet printing of color patterns.

[0019] The LED chip layer 3 in this invention is composed of vertically structured LED chip particles, with a particle size of 20-300 micrometers. LED electrodes are located at the top and bottom ends of the chip. The LEDs do not require bonding electrode leads or connection wires; this invention directly uses the LED chip, with the emitting surface in contact with the transparent conductive film layer. The vertically structured LED chips can be used individually or in multiples. Multiple LED chips are arranged in a matrix or pattern, which can be achieved using a mobile machine or printing. The emitting surface of the LED chip particles is bonded to the transparent conductive film layer using a conductive adhesive. Insulating ink is filled between the LED chip particles and rapidly cured using ultraviolet light, ensuring the stability of the columnar LED particles. Red, blue, and green LED chips can be used, or only blue LED chips can be used. The surface of the blue LED chip uses a colored fluorescent film pattern, which can be efficiently converted and combined to produce colored light.

[0020] The preferred preparation method for the LED chip layer 3 in this invention is as follows: 1) Using one of the following materials—polyester, polyurethane, nylon, and polyethylene—a 10-300 micrometer thick screen film is prepared by electrospinning. The thickness should be less than or equal to the chip height. The transparent multilayer screen film prepared by electrospinning has compressive elasticity. 2) The LED chips are arranged in a regular pattern and inserted into the mesh of the screen film for fixation. The multilayer screen film prepared by electrospinning has tensile elasticity in its mesh openings. The size of the mesh openings should be approximately equal to the length and width of the LED chip to ensure stable standing of the LED chip. 3) The screen film carrying the LED chips is applied to a transparent conductive layer. UV insulating ink is applied to partially or completely fix the screen film. Then, a film coil layer or back electrode layer is applied over it. This preparation method prevents the LED chip from tipping over, which solves the problems of LED chip movement and easy scattering during application, and maintains the consistent orientation of the LED light-emitting surface.

[0021] The back electrode layer 4 in this invention is one of ITO, conductive polymer, silver nanowires, silver paste, copper paste, and carbon paste. Conductive ink can be applied to the surface of other objects, such as glass, plastic, paper, and textiles. The back electrode layer is formed on the back surface of the LED chip layer by printing, coating, and vacuum sputtering, and is tightly bonded to the lower electrode point of the LED chip. The pattern of the back electrode layer is formed using a printer. The back electrode layer uses a transparent conductive material to form double-sided transparent light emission. The back electrode layer 4 is then covered with an insulating layer 5, which is printed multiple times with insulating ink. The insulating layer 5 has silver paste interface holes between the transparent electrode layer and the back electrode layer, and is printed and connected to the thin-film coil layer 6.

[0022] The thin-film coil layer 6 in this invention is prepared on the insulating layer 5. The thin-film coil layer 6 is formed by printing, etching, or using silver or copper paste with good conductivity to form lines. The thin-film coil can receive radio electromagnetic signals, such as those from mobile phones, wireless chargers, electromagnetic radiation from induction cookers, and wireless charging for cars. The pattern of the thin-film coil layer with lines is circular or square, and its shape and size are proportional to the number and brightness of the LEDs. Figure 3 The width of the conductive lines in the thin-film coil is 0.5-2 mm, and the spacing between the conductive lines is 0.5-2 mm. The density and area of ​​the thin-film coil are directly proportional to the LED power. The larger the coil, the higher the brightness of the LED. The generated AC voltage is 1-12V. Of course, this wireless AC driving direct light emission is also effective for other thin-film electroluminescent or field-luminescent devices.

[0023] In this invention, the transparent protective layer 1 and the back protective layer 7 are formed by printing with insulating ink, which is one of polyurethane, acrylic, epoxy resin, or fluoropolymer coating. A protective film is formed through coating, printing, or spraying. Various patterns and colors corresponding to the light-emitting areas are printed on the surfaces of the transparent and back protective layers. A thin film such as homogenizing silicone can be covered on the surface of the transparent protective layer, enabling the LED to form a uniform surface light source and avoiding the unevenness of point light sources.

[0024] The back protective layer 7 in this invention is formed on the surface of PET, PI, TPU, or PVC plastic film by printing, coating, or vacuum sputtering. An LED chip layer is then bonded to it, and a back electrode layer is fabricated on the back of the LED chip layer. The back electrode layer uses a transparent conductive layer to achieve double-sided light emission. The thin-film coil layer 6 in this invention can use a multi-layer structure, with each layer isolated by insulating ink. Different layers of thin-film coils are connected to different LEDs, forming controllable, multi-region, large-area light-emitting patterns and images. This invention is also applicable to quantum dot perovskite low-voltage AC electroluminescence.

[0025] The present invention provides a wirelessly driven LED thin-film light-emitting display device ( Figure 2It comprises, in sequence: a transparent protective layer 1, a transparent conductive thin film layer 2, an LED chip layer 3, a thin film coil layer 6, and a back protective layer 7. Its key feature is that the LED chip layer is formed by arranging multiple vertically structured LED chip particles in a silkscreen film, with UV-curable insulating ink filling the spaces between the LED chip particles. The LED chip layer is tightly sandwiched between the transparent conductive thin film layer and the thin film coil layer. One electrode of each LED chip particle is connected to the conductive portion of the thin film coil, which is equivalent to electrode 10 within the thin film coil layer. The thin film coil layer can receive electromagnetic signals and also serves as the back electrode layer of the LED. The electrode leads of the transparent conductive thin film layer are connected to the outer electrode 8 of the thin film coil layer. The thin film coil layer 6 is fabricated using a transparent conductive thin film and laser-etched into a thin film coil. The thin film coil layer receives electromagnetic induction to generate an AC 1-12V voltage, wirelessly driving the LED to form a flexible, flashing, transparent, double-sided light-emitting film. The advantages of this invention are:

[0026] 1) The unique structure of this invention enables uniform surface light emission from LED thin films. It features a simple structure, low cost, high brightness and safety, stable operation under both high and low voltage conditions, and requires no circuitry or power supply wiring. Its appearance resembles a plastic card, and it can form a transparent, double-sided light-emitting structure. This invention can also be used to prepare illuminated text and patterns on the surfaces of materials such as paper, glass, wood, textiles, metals, and plastics for display and illumination.

[0027] 2) The light-emitting device of the present invention can also be used for household appliance indicators, power safety detection, electromagnetic leakage detection, automotive lighting, underwater light-emitting display lighting, biological reagent kit indicators, bank financial securities card anti-counterfeiting, mobile phone case display, nanotherapy diagnosis, etc.

[0028] 3) This invention can be widely used in fields such as vehicle illumination, instruments, clothing, packaging, toys and stationery, mobile communications, cardboard, advertising, decoration, and safety warnings.

[0029] Having described the preferred embodiments of the present invention above, it should be understood by those skilled in the art that any changes and modifications made to the present invention without departing from its spirit and scope are within the scope of the present invention.

Claims

1. A wirelessly driven LED thin-film light-emitting display device, comprising, in sequence: The device comprises a transparent protective layer, a transparent conductive thin film layer, an LED chip layer, a back electrode layer, an isolation layer, a thin film coil layer, and a back protective layer. The LED chip layer is formed by arranging multiple vertically structured LED chip particles in a screen film, with the LED chip layer tightly sandwiched between the transparent conductive thin film layer and the back electrode layer. An isolation layer is loaded behind the back electrode layer, and a thin film coil is printed on the rear surface of the isolation layer. Electrode leads printed on the transparent conductive thin film layer and the back electrode layer are connected to the thin film coil layer. The thin film coil layer receives electromagnetic induction to generate an AC 1-12V voltage, wirelessly driving the LEDs to form dynamic patterns, thus creating a flexible thin film light-emitting display device.

2. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The transparent protective layer or back protective layer is one of the following: PET, PI, TPU, PVC, and fluoroplastic film. It has a smooth surface and a thickness of 0.05 mm to 0.5 mm.

3. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The transparent conductive film layer is one of ITO, conductive polymer, and silver nanowires. The transparent conductive film layer is based on a transparent protective layer and is formed on the surface of the transparent protective layer by printing, coating, or vacuum sputtering, and is in close contact with the vertical electrode point of the LED light-emitting surface. The pattern of the transparent conductive film layer is formed by laser ablation.

4. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, wherein the LED chip layer is prepared by: firstly, using one of polyester, polyurethane, nylon, and polyethylene as material, a 10-300 micrometer thick screen film is prepared by electrospinning technology; then, LED chips are arranged in a regular pattern and inserted into the mesh of the screen film for fixation; the screen film carrying the LED chips is applied to a transparent conductive layer, UV insulating ink is dripped to fix the screen film, and then a thin-film coil layer or back electrode layer is covered and pasted.

5. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The back electrode layer is One of ITO, conductive polymer, silver nanowires, silver paste, copper paste, and carbon paste; the back electrode layer is formed on the back surface of the LED chip layer by printing, coating, or vacuum sputtering, and is closely attached to the lower electrode point of the LED chip; the pattern of the back electrode layer is formed using a printer; the back electrode layer uses a transparent conductive material to form double-sided transparent light emission.

6. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The thin-film coil layer uses highly conductive silver or copper paste to print, etch, and form lines; The thin-film coil layer pattern in the shape of the lines is circular or square, the width of the conductive lines is 0.5-2 mm, and the spacing between the conductive lines is 0.5-2 mm. The density and area of ​​thin-film coils are directly proportional to the LED power.

7. A wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: it is transparent. The protective layer and the back protective layer are formed by printing insulating ink. The insulating ink is one of polyurethane, acrylic, epoxy resin, and fluoropolymer coating. A protective film is formed by coating, printing, or spraying. Various patterns and colors corresponding to the light-emitting areas are printed on the surface of the transparent protective layer and the back protective layer.

8. The wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The multilayer thin-film coil layers are isolated using insulating ink, and different layers of thin-film coils are connected to different LEDs to form controllable multi-area large-area light-emitting patterns and images.

9. A wirelessly driven LED thin-film light-emitting display device, comprising, in sequence: The product comprises a transparent protective layer, a transparent conductive thin film layer, an LED chip layer, a thin film coil layer, and a back protective layer. The LED chip layer is formed by arranging multiple vertically structured LED chip particles in a silkscreen film, with insulating ink filling the spaces between the LED chip particles. The LED chip layer is tightly sandwiched between the transparent conductive thin film layer and the thin film coil layer. Electrode leads of the transparent conductive thin film layer are connected to the thin film coil layer. The thin film coil layer is made of a transparent conductive material and receives electromagnetic induction to generate an AC 1-12V voltage, wirelessly driving the LED to form a flexible, flashing, transparent, double-sided light-emitting film.

10. A wirelessly driven LED thin-film light-emitting display device as described in claim 1, characterized in that: The LED chip layer is composed of vertically structured LED chip particles arranged in a matrix or pattern. The light-emitting surface of the LED chip particles is bonded to a transparent conductive film layer. Insulating ink is filled between the LED chip particles.

Images