A spreading gradual brightening electroluminescent sheet

Abstract

The present application is a kind of gradual diffuse bright electroluminescent sheet, which can realize gradual diffuse bright dynamic light in a single area of a group of electrodes. The dynamic light is like water flowing and gradually lighting, which comprises in order: transparent protective layer, transparent conductive layer, electroluminescent layer, back conductive layer and protective layer. At least one of the transparent conductive layer or the back conductive layer is composed of ion transparent conductive film, which contains ion conductive material. When the transparent conductive layer and the back conductive layer are insulated and superposed with electrode loading voltage, the electroluminescent sheet will automatically produce dynamic gradual diffuse bright light and gradually retract and extinguish. The present application can be used for signal display of aircraft, vehicle and ship, and widely used in the field of night light, such as advertisement, lamp, toy, electric appliance, instrument, safety direction indication and the like.

Description

Technical Field

[0001] This invention pertains to the fabrication and application of electroluminescent display devices. Technical Background

[0002] Existing inorganic powder electroluminescent surface light source devices are mostly manufactured on the surface of flexible plastic films. Typical commercial devices consist of a base PET film, a transparent conductive ITO layer, a light-emitting layer, a dielectric layer, and a silver back electrode layer. These are then combined using a printing and coating process to form a sandwich-type solid-state planar light-emitting device structure. Due to the excellent conductivity of the two sandwich conductive layers, an electric field is instantaneously applied to the entire light-emitting layer, resulting in large-area overall light emission. Devices with a single independent electrode can only produce instantaneous light emission and extinguishing. Adjusting the voltage using a driver can only change the overall brightness, failing to create a dynamic, diffuse, and gradual light emission phenomenon and effect. Current advertising flashing, gradual light emission effects are achieved through multi-segment, multi-area arrangement design and printing, with each area's electrode independently led out. These numerous independently led-out electrodes are connected to multiple chips, and combined with multi-channel chip control for time-incrementing conduction, the arranged areas emit light sequentially over time, creating a visually dynamic, progressive light emission effect. This method of independently controlling dozens or even hundreds of areas requires a large number of electrodes and chip connections, resulting in a huge workload, susceptibility to failure, and the occupies a significant amount of space due to the connecting wires and circuitry.

[0003] This invention discloses a diffusely brightening electroluminescent sheet that can achieve dynamic light emission from a single area of ​​a set of electrodes, with the dynamic light emission resembling the gradual diffusion and flow of water. Its structure sequentially includes: a transparent protective layer, a transparent conductive layer, an electroluminescent layer, a back conductive layer, and a protective layer. At least one of the transparent conductive layer or the back conductive layer is composed of an ion-transparent conductive film containing ion-conductive materials. When an insulating, co-located electrode is applied to the transparent conductive layer and the back conductive layer, the electroluminescent sheet automatically generates dynamic, gradually brightening and gradually receding light emission and extinguishing.

[0004] This invention can be widely used in advertising, lighting fixtures, toys, electrical appliances, instruments, safety direction indicators and other fields to achieve simple dynamic progressive diffuse lighting and extinguishing. Summary of the Invention

[0005] A diffusely brightening electroluminescent sheet comprises, in sequence: a transparent protective layer 5, a transparent conductive layer 4, an electroluminescent layer 3, a back conductive layer 2, and a protective layer 1. At least one of the transparent conductive layer or the back conductive layer is composed of an ion-transparent conductive film containing an ion-conductive material. When a voltage is applied to the insulatingly superimposed electrode 6 of the transparent conductive layer and the back conductive layer, the light-emitting area dynamically changes proportionally to the voltage. The gradually brightening region of the electroluminescent sheet automatically produces a dynamic, gradually spreading, brightening, and gradually receding extinguishing effect. The gradually brightening region refers to a fixed brightness distribution within a certain distance, where the luminous intensity increases from weak to strong when a static constant voltage is applied. This fixed distribution gradually spreads and moves with voltage changes, visually creating a dynamic, water-like, gradually spreading, brightening effect.

[0006] The ion-transparent conductive film of this invention is a mixture of potassium, sodium, and lithium ion-conductive materials and plastic. It is prepared as a self-adhesive ion-transparent conductive film using a solid-state casting method. The ion-transparent conductive film contains different ions, resulting in different conductivities, which change with voltage. Unlike existing ITO films, metal conductive layers, or other polymer conductive inks, the ion-transparent conductive film has no sheet resistance. Each ion-transparent conductive film contains only one type of ion-conductive material and is self-adheded to the surface of an electroluminescent layer via vacuum hot pressing.

[0007] The ion-transparent conductive film in this invention is a film composed of a mixture of ion-conductive material and plastic, with a conductivity controlled between 10-100 S / cm. 2 The ion-conducting material is one of potassium perchlorate, sodium perchlorate, or lithium perchlorate. The plastic in the ion-transparent conductive film is PVA. These materials are mixed uniformly and prepared into a film using a solid-state casting method. Different film preparation methods result in different conductivity levels even with the same content of ion-conducting material, leading to different effects. Higher concentrations of ion-conducting material result in higher conductivity and faster dynamic diffusion and gradual brightening. However, excessively high conductivity results in no gradual brightening area and no diffuse luminescence effect. Lower concentrations of conductive ions result in lower conductivity, slower dynamic diffusion and gradual brightening, and a larger brightening area. For single-layer ion-transparent conductive films, a ion-conducting material content of 10-30% of the total weight yields good results. For multi-layer composite ion-transparent conductive films, a ion-conducting material content of 5-15% of the total weight yields good results. Effective selection of conductive ions, addition of other plastics, and control of the preparation method, along with appropriate conductivity, can also produce similar effects. The ion-transparent conductive film has a non-smooth surface, which reduces the likelihood of bubble marks during multi-layer film lamination.

[0008] The transparent conductive layer in this invention is formed by stacking and combining at least two different ion-transparent conductive films. These films have different electrical conductivities; lithium ions conduct better at the same concentration. The stacking and combining of two films with different conductivity results in a distinct gradually brightening region. Using the same electrode to apply voltage allows for control over the size of this brightening region. Alternatively, a single ion-transparent conductive film can be combined with an electroluminescent layer, allowing for precise control over the size of the gradually brightening region. This refers to a static, constant voltage application that results in a brightness distribution from weak to strong within a certain distance. This fixed distribution of the gradually brightening region gradually spreads and moves with voltage changes, creating a visually dynamic, gradually spreading, and gradually brightening effect. The back conductive layer can also be formed by stacking and combining two different ion-transparent conductive films with different conductivity, achieving better distance control of the gradually brightening region compared to a single ion-transparent conductive film.

[0009] The electroluminescent layer in this invention is composed of a mixture of electroluminescent material and PVA plastic, which is then stretched into a thin film using a casting machine. This electroluminescent layer film has a non-smooth surface, which is suitable for overlapping and prevents bubble formation. The back conductive layer uses an ion-transparent conductive film, forming a double-sided diffuse, gradually brightening emission. This double-sided emission is semi-transparent electroluminescence. A dielectric layer is present on the back of the electroluminescent layer, forming a diffuse, gradually brightening emission with different brightness on both sides. The emission brightness is relatively weaker with the dielectric layer, but the diffuse emission areas on both sides are consistent because they share a common electric field. The dielectric layer is a thin film containing materials such as barium titanate. The gradually brightening area of ​​the electroluminescent sheet periodically and automatically generates dynamic, gradually spreading, gradually brightening emission and gradually receding and extinguishing. The gradually brightening area refers to the fixed brightness distribution formed by the emission intensity from weak to strong within a certain distance when a static constant voltage is applied. This fixed distribution gradually spreads and moves with voltage changes, creating a visually dynamic, gradually spreading, gradually brightening emission effect.

[0010] The transparent protective layer and protective layer in this invention are made of one of PET, TPU, PVA, fluoroplastic film, or silicone film. At least one side of the transparent protective layer and protective layer has a non-flat surface. Since zinc sulfide, the electroluminescent material, readily undergoes an electrochemical reaction when used in PVA, the non-flat surface provides a stabilizing effect in this invention. The transparent protective layer and protective layer of this invention function essentially the same as those in traditional devices, but using PVA makes it easier to composite with ion-transparent conductive films. The transparent protective layer and protective layer are self-adheded to the surface of the ion-transparent conductive film via vacuum hot pressing. The transparent protective layer and protective layer use an elastic plastic film material to form an elastic electroluminescent sheet, which can improve lifespan and stability.

[0011] The back conductive layer in this invention is either an ion-transparent conductive film or a conductive paste. The back conductive layer can use a conductive metal paste produced using conventional processes, while the transparent conductive layer is an ion-transparent conductive film. The composite of these two ion-transparent conductive films forms a diffuse, gradually brightening, and rapidly luminescent emission. Alternatively, the transparent conductive layer can be either an ion-transparent conductive film or an ITO conductive film. The transparent conductive layer can be a conventional ITO conductive film, while the back conductive layer is an ion-transparent conductive film. The composite of these two ion-transparent conductive films forms a diffuse, gradually brightening, and rapidly luminescent emission. A preferred embodiment of this invention is that both the transparent conductive layer and the back conductive layer are ion-transparent conductive films.

[0012] The invention utilizes a dedicated voltage-regulated control driver. The driver is interconnected with the electrodes, and a chip controls the timing, speed, and frequency of the voltage's cyclic rise and fall. This allows the electroluminescent sheet to periodically and automatically generate dynamic, gradually spreading and brightening light, followed by gradual fading and extinguishing. Uniform voltage control results in a better gradual brightening effect. While a conventional driver can also produce a gradually brightening area movement effect, it cannot repeat cyclically, and the speed is not regularly controlled.

[0013] In this invention, both the transparent conductive layer and the back conductive layer are equipped with electrode 6 connecting pieces. The electrodes of the transparent conductive layer and the back conductive layer form an insulating, co-located superimposed structure, ensuring uniform voltage and current loading. This co-located superimposed structure is a crucial guarantee for the unique effect of the movable light emission of this invention. Traditionally, the two separate electrodes are prone to burning out, and the diffused brightening effect is not obvious because the conductivity of the ion-transparent conductive film is inferior to that of traditional ITO and silver paste. The electrodes introduced in this invention have single-sided conductivity, and an insulating isolation layer 7 is provided between the two electrodes to ensure that the two electrodes will not short-circuit. When both the transparent conductive layer and the back conductive layer are ion-transparent conductive films, the electrode connection is firm; otherwise, poor contact and overheating are likely. Electroluminescent sheets with the same concentration or type of ion-transparent conductive film will automatically generate dynamic, slow, and gradually diffused brightening light emission.

[0014] The preparation process of this invention is as follows: 1) First, ion-transparent conductive films, including an electroluminescent layer film, a transparent conductive layer film, and a back conductive layer film, are prepared separately. These can all be independently fabricated using a casting machine, or the electroluminescent layer film can be prepared first, and then the transparent conductive layer film and the back conductive layer film can be directly cast on both sides. This method yields better results than subsequent vacuum composite films. 2) Electrodes are attached to the same positions on the transparent conductive layer film and the back conductive layer film. These electrodes can be pre-prepared to create partially overlapping areas of insulation; using traditional electrode sheets will result in short-circuit faults. 3) The transparent conductive layer film, the electroluminescent layer film, and the back conductive layer film are pressed into an integrated sandwich structure electroluminescent film using a vacuum pressure composite machine. In this multi-layer post-composite film, the removal of air bubbles ensures quality. 4) The transparent protective layer, the sandwich structure electroluminescent film, and the protective layer are pressed into a single unit and connected to a dedicated driver to form a diffusely brightening electroluminescent sheet. Attached Figure Description

[0015] Figure 1 Structure diagram of diffused gradually brightening electroluminescent sheet

[0016] Figure 2 Diffusion gradually brightening electroluminescent sheet luminous effect

[0017] In the diagram: 1. Protective layer, 2. Back conductive layer, 3. Electroluminescent layer, 4. Transparent conductive layer, 5. Transparent protective layer, 6. Electrode, 7. Insulating layer. Specific implementation methods

[0018] An electroluminescent sheet with a gradually brightening effect has the following structure: a transparent protective layer 5, a transparent conductive layer 4, an electroluminescent layer 3, a back conductive layer 2, and a protective layer 1. At least one of the transparent conductive layer or the back conductive layer is composed of an ion-transparent conductive film containing ion-conductive materials. When an insulating, co-located electrode is applied to the transparent conductive layer and the back conductive layer, the luminescent area dynamically changes proportionally to the voltage. The electroluminescent sheet automatically produces a dynamic, gradually spreading, brightening, and gradually receding extinguishing effect in the gradually brightening area. Conventional transparent conductive layers are ITO films based on PET, which have good conductivity. Conventional back conductive layers are printed metallic silver conductive layers. Both have good conductivity, and their conductivity does not change with voltage; they can only produce full brightness or adjust the light intensity through voltage. The gradually brightening area of ​​this invention refers to a fixed brightness distribution from weak to strong within a certain distance when a static constant voltage is applied. This fixed distribution gradually spreads and moves with voltage changes, creating a visually dynamic, gradually spreading, brightening effect, like water spreading uniformly into the distance until full illumination. Figure 2 The photo shows the luminous effect of a diffusely brightening electroluminescent sheet and the gradually brightening area. Depending on the size of the electroluminescent sheet device, the gradually brightening area is typically 1-5 cm.

[0019] The ion-transparent conductive film of this invention is a mixture of potassium, sodium, and lithium ion-conducting materials and plastic. The ion-conducting material is one of potassium perchlorate, sodium perchlorate, and lithium perchlorate, and the plastic in the ion-transparent conductive film is PAV. The self-adhesive ion-transparent conductive film is prepared using a solid-state casting machine at 230 degrees Celsius. Different ions in the ion-transparent conductive film result in different conductivity levels, and each ion-transparent conductive film contains only one type of ion-conducting material. The thickness of the ion-transparent conductive film is typically 10-100 micrometers and is uniform. The ion-transparent conductive film is self-adheded to the surface of the electroluminescent layer by vacuum hot pressing.

[0020] The ion-transparent conductive film of this invention is a mixture of ion-conductive material and plastic film, wherein the content of ion-conductive material accounts for 5-30% of the total weight; and the conductivity is controlled at 30-50 S / cm.2 It exhibits good diffused brightening effect. The ion-conducting materials are potassium perchlorate, sodium perchlorate, and lithium perchlorate, while the plastic in the ion-transparent conductive film is PVA. A higher concentration of the ion-conducting material results in a faster dynamic diffused brightening time; a lower concentration of conductive ions results in a slower dynamic diffused brightening time. The ion-transparent conductive film has a non-smooth surface, which makes it less likely for polyvinyl alcohol to form bubble marks during multilayer film lamination. Different combinations of ion-conducting materials and different plastics, along with different methods for controlling the preparation of ion-transparent conductive films, lead to complex conductivity formation and stabilization, resulting in significant performance differences. For example, the plastic used may be an acrylamide polymer.

[0021] The transparent conductive layer in this invention is formed by stacking and combining at least two different ion-transparent conductive films. These films have different electrical conductivities and rely on voltage for electroluminescence, exhibiting low current carrying capacity. Unlike conventional ITO and metallic conductors, ion-transparent conductive films have no sheet resistance. At the same concentration, lithium ions conduct better, while sodium ions conduct weaker. Stacking and combining two ion-transparent conductive films with different conductivityes and applying the same electrode voltage allows control over the size of the gradually brightening region. This refers to a static, constant voltage application that results in a gradual, increasing brightness distribution within a certain distance. This fixed distribution gradually spreads and moves with voltage changes, creating a visually dynamic, gradually spreading, and gradually brightening effect. The back conductive layer is also formed by stacking and combining at least two different ion-transparent conductive films. The different conductivity of these films allows for better distance control of the gradually brightening region compared to using a single ion-transparent conductive film.

[0022] The electroluminescent layer in this invention is composed of a mixture of electroluminescent material and PVA plastic, which is then stretched into a thin film using a casting machine. The film is typically 30-50 micrometers thick and uniform in thickness. The electroluminescent material used is a conventional luminescent material such as zinc sulfide copper, or commercially available KPT grades D502 and D512. PVA plastic is used to ensure a strong, unified bond during subsequent lamination. However, electroluminescent materials can be mixed with other types of plastics, such as acrylics, which are prone to delamination and cracking. The electroluminescent layer film has a non-uniform surface, which is suitable for layering films. In this invention, the non-uniform surface refers to a surface with a 20-100 nanometer-wide texture, similar to a frosted finish, which can be achieved through die-casting. The film is uniformly smooth overall. After lamination, it remains transparent, does not affect brightness, and is less prone to bubble formation. This is related to the inherent properties of the electroluminescent material, which is well-suited to the electrochemical reactions that occur during electroluminescence. The back conductive layer uses an ion-transparent conductive film to form a double-sided diffused gradually brightening light emission. This double-sided light emission is a semi-transparent electroluminescence. There is a dielectric layer on the back of the electroluminescent layer, forming a diffuse gradually brightening light emission with different brightness on both sides. The light emission brightness is relatively weaker with the dielectric layer, but the light emission spread area on both sides is consistent because they have a common electric field.

[0023] The transparent protective layer and protective layer in this invention are selected from PET, PVA, TPU, fluoroplastic film, and silicone film. The transparent protective layer has a significant moisture-proof effect. PVA easily absorbs moisture, causing aging of the light-emitting device and a rapid decrease in luminous intensity. Choosing fluoroplastic film or silicone film can maintain similar tensile elasticity to other film layers, facilitating bending of the device, and especially providing good folding resistance and moisture resistance. At least one side of the transparent protective layer and protective layer has a non-flat surface. Since the electroluminescent material zinc sulfide is prone to electrochemical reactions, the non-flat surface has a stabilizing effect in this invention. The transparent protective layer and protective layer of this invention function essentially the same as those of traditional devices. Using PVA makes it easier to composite with ion-transparent conductive films. The transparent protective layer and protective layer are self-adheded to the surface of the ion-transparent conductive film by vacuum hot pressing; the transparent protective layer and protective layer use elastic plastic film material to form an elastic electroluminescent sheet.

[0024] The back conductive layer in this invention is either an ion-transparent conductive film or a conductive paste. The back conductive layer can use a conductive paste with conventional processes, while the transparent conductive layer is an ion-transparent conductive film. The two ion-transparent conductive films are combined to form a diffuse, gradually brightening, and rapidly luminescent light. Alternatively, the transparent conductive layer can be either an ion-transparent conductive film or an ITO conductive film. The transparent conductive layer is a conventional ITO conductive film, while the back conductive layer is an ion-transparent conductive film. The two ion-transparent conductive films are combined to form a diffuse, gradually brightening, and rapidly luminescent light.

[0025] The invention utilizes a dedicated voltage-regulated driver connected to electrodes. A chip controls the cyclical rise and fall of the voltage, its speed, and frequency. The electroluminescent sheet automatically and periodically produces a dynamic, gradually spreading and brightening emission followed by a gradual fading and extinguishing, repeating this cycle. The voltage ranges from 0-400V, and the frequency from 50-1000 Hz, with uniformly controlled rise and fall. A voltage of 0-150V produces a better gradual brightening effect. While conventional drivers can also produce a gradual brightening effect, they cannot repeat the cycle, and the speed is not regularly controlled. The electroluminescent sheet with the gradual brightening effect of this invention exhibits better high-voltage resistance than devices produced using traditional screen-printing processes.

[0026] In this invention, the electrodes of the transparent conductive layer and the back conductive layer form an insulating, co-located superposition structure. This co-located superposition structure allows the gradually brightening region to spread in a single direction and ensures a constant and uniform electric field in the light-emitting region, preventing heat generation and device damage. Figure 1 This is one of the fundamental structures of this invention. The in-situ superposition of electrodes is a crucial guarantee for the special effect of this invention in terms of mobile light emission. Traditionally, two separate electrodes are not suitable for use. Due to the special structure and electrode matching of this invention, the stability of the device can be guaranteed. The electrodes brought out by this invention have single-sided conductivity, and an insulating layer is provided between the two electrodes to ensure that the two electrodes will not short-circuit. When both the transparent conductive layer and the back conductive layer are ion-transparent conductive films, the electrode connection is firm. Otherwise, poor contact and heat generation are likely to occur. Electroluminescent sheets with transparent conductive films of the same concentration or type of ions will automatically generate dynamic, slow, gradual diffusion and brightening light emission.

[0027] The preparation process of this invention is as follows: 1) First, prepare the electroluminescent layer film, transparent conductive layer film, and back conductive layer film separately. These can all be independently fabricated using a casting machine, or the electroluminescent layer film can be prepared first, and then the transparent conductive layer film and back conductive layer film can be directly cast on both sides. This method yields better results than post-composite films. 2) Attach electrodes to the same positions on the transparent conductive layer film and back conductive layer film. The electrodes can be pre-prepared to create partially overlapping areas of insulation; using traditional electrode sheets will result in short-circuit faults. 3) Press the transparent conductive layer film, electroluminescent layer film, and back conductive layer film into an integrated sandwich structure electroluminescent film using a vacuum pressure composite machine. This multi-layer post-composite film ensures quality by removing air bubbles. 4) Press the transparent protective layer, sandwich structure electroluminescent film, and protective layer into a single unit and connect it to a dedicated driver to form a diffusely brightening electroluminescent sheet.

[0028] The advantages of this invention are:

[0029] This invention achieves a diffuse, gradually brightening electroluminescence effect. It employs a simple light-emitting sheet and electrode structure design and controls the gradually brightening region through a solid-state preparation method of ion-transparent conductive thin films. The device prepared by this structure and method has a uniform thickness and is suitable for mass production.

[0030] The diffuse, gradually brightening electroluminescent light of this invention has excellent weather resistance, pressure resistance, bending resistance, elasticity, and high voltage carrying capacity. It can be used for signal lights and indicator signs on airplanes, vehicles, ships, and subways, and is also suitable for architectural lighting decorations and road safety signs.

[0031] The diffused gradually brightening electroluminescent sheet of this invention has low production cost, high process controllability, and is suitable for large-scale production. It changes the traditional printing and coating process and uses non-toxic and pollution-free materials. It can be used for instrument lighting, consumer electronics products, household appliance indicator markings, panel lighting, etc.

[0032] This invention is suitable for application to dynamic effects in advertising, is easy to control, and is suitable for clothing, toys, furniture, beach umbrellas, and Christmas luminous decorations.

Claims

1. A diffusely brightening electroluminescent sheet, comprising, in sequence: Transparent protective layer, transparent conductive layer, electroluminescent layer, back conductive layer, protective layer; At least one of the transparent conductive layer and the back conductive layer is composed of an ion-transparent conductive film containing an ion-conductive material. The ion-transparent conductive film is made by mixing a conductive material containing potassium, sodium, and lithium ions with plastic, and the plastic in the ion-transparent conductive film is PVA. The transparent conductive layer is formed by stacking and combining at least two different ion-transparent conductive films. The back conductive layer is also formed by stacking and combining at least two different ion-transparent conductive films. The two different ion-transparent conductive films have different conductivity to achieve distance control of the gradually brightening region. When a voltage is applied to the insulating and co-located electrodes of the transparent conductive layer and the back conductive layer, the electroluminescent sheet will produce dynamic, gradually spreading, gradually brightening light and gradually receding and extinguishing light.

2. The diffusely brightening electroluminescent sheet as described in claim 1, wherein the ion-transparent conductive film is made by mixing a conductive material containing potassium, sodium, and lithium ions with plastic, wherein the plastic of the ion-transparent conductive film is PVA, and a self-adhesive ion-transparent conductive film is prepared by a solid-state method using a casting machine; the ion-transparent conductive film is self-adheded to the surface of the electroluminescent layer by vacuum hot pressing.

3. The diffusely brightening electroluminescent sheet as described in claim 1, wherein the conductivity of the ion-transparent conductive film is 10-100 S / cm 2 The ion-conducting material is one of potassium perchlorate, sodium perchlorate, or lithium perchlorate; the ion-conducting material has a high concentration, high conductivity, and fast dynamic diffusion and gradual brightening time; the conductive ion concentration is low, the conductivity is low, and the dynamic diffusion and gradual brightening time is slow; the ion-transparent conductive film has a non-flat surface.

4. The diffuse gradually brightening electroluminescent sheet as described in claim 1, wherein the electroluminescent layer is made by mixing electroluminescent material with PVA plastic, and then drawing the electroluminescent layer film by a casting machine, the electroluminescent layer film has a non-flat surface, the back conductive layer uses an ion-transparent conductive film to form a double-sided diffuse gradually brightening light emission; the back of the electroluminescent layer has a dielectric layer to form a diffuse gradually brightening light emission with different brightness on both sides.

5. The diffused gradually brightening electroluminescent sheet as described in claim 1, wherein the transparent protective layer and the protective layer are one of TPU, PVA, fluoroplastic film, and silicone film, and at least one side of the transparent protective layer or the protective layer has a non-flat surface; the transparent protective layer and the protective layer are self-adheded to the surface of the ion-transparent conductive film by vacuum hot pressing; the transparent protective layer and the protective layer are made of elastic plastic film material to form an elastic electroluminescent sheet.

6. The diffusely brightening electroluminescent sheet as described in claim 1, wherein the back conductive layer is one of an ion-transparent conductive film or a conductive paste, wherein the back conductive layer uses a conductive paste, and the transparent conductive layer is an ion-transparent conductive film, wherein the two ion-transparent conductive films are combined to form a diffusely brightening rapid light emission; wherein the transparent conductive layer is one of an ion-transparent conductive film or an ITO conductive film, wherein the transparent conductive layer is an ITO conductive film, and the back conductive layer is an ion-transparent conductive film, wherein the two ion-transparent conductive films are combined to form a diffusely brightening rapid light emission.

7. The diffuse gradually brightening electroluminescent sheet as described in claim 1 uses a dedicated voltage regulation control driver. The driver and electrodes are interconnected. The chip controls the voltage cycle rise and fall time, speed, and frequency. The gradually brightening area of ​​the electroluminescent sheet automatically generates dynamic, gradually diffused, gradually brightening light and gradually receding and extinguishing light. The gradually brightening area refers to the fixed brightness distribution formed by the light intensity from weak to strong within a certain distance when a static constant voltage is applied. This fixed distribution will gradually spread and move with the voltage change to form a visually dynamic, gradually diffused, gradually brightening light effect.

8. The diffusely brightening electroluminescent sheet as described in claim 1, wherein the transparent conductive layer and the back conductive layer are each provided with an electrode connecting piece, the electrodes of the transparent conductive layer and the back conductive layer form an insulating co-position superimposed structure, the led-out electrodes are single-sided conductive, and an insulating isolation layer is provided between the two electrodes; the transparent conductive layer and the back conductive layer are ion-transparent conductive films, and the electroluminescent sheet automatically generates dynamic slow-speed gradually diffused and brightening light.

9. The method for preparing a diffusely brightening electroluminescent sheet as described in claim 1 is as follows: 1) First, prepare ion-transparent conductive films for the electroluminescent layer film, transparent conductive layer film, and back conductive layer film respectively; 2) Adhere electrodes to the same positions on the transparent conductive layer film and the back conductive layer film respectively; 3) Press the transparent conductive layer film, electroluminescent layer film, and back conductive layer film into an integrated sandwich structure electroluminescent film using a vacuum pressure composite machine; 4) Press the transparent protective layer, sandwich structure electroluminescent film, and protective layer into an integrated diffusely brightening electroluminescent sheet and connect it to a dedicated driver.

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